ViewVC Help

View File | Revision Log | Show Annotations | Download File | Root Listing

root/jsr166/jsr166/src/jsr166e/ConcurrentHashMapV8.java

Comparing jsr166/src/jsr166e/ConcurrentHashMapV8.java (file contents):
Revision 1.67 by jsr166, Sun Oct 21 04:07:13 2012 UTC vs.
Revision 1.108 by jsr166, Mon Jul 1 19:19:31 2013 UTC

#	Line 5 | Line 5
5		*/
6
7		package jsr166e;
8	<	import jsr166e.LongAdder;
8	>
9		import jsr166e.ForkJoinPool;
10	–	import jsr166e.ForkJoinTask;
10
11	<	import java.util.Comparator;
11	>	import java.io.ObjectStreamField;
12	>	import java.io.Serializable;
13	>	import java.lang.reflect.ParameterizedType;
14	>	import java.lang.reflect.Type;
15		import java.util.Arrays;
14	–	import java.util.Map;
15	–	import java.util.Set;
16		import java.util.Collection;
17	<	import java.util.AbstractMap;
18	<	import java.util.AbstractSet;
19	<	import java.util.AbstractCollection;
20	<	import java.util.Hashtable;
17	>	import java.util.Comparator;
18	>	import java.util.ConcurrentModificationException;
19	>	import java.util.Enumeration;
20		import java.util.HashMap;
21	+	import java.util.Hashtable;
22		import java.util.Iterator;
23	<	import java.util.Enumeration;
24	<	import java.util.ConcurrentModificationException;
23	>	import java.util.Map;
24		import java.util.NoSuchElementException;
25	+	import java.util.Set;
26		import java.util.concurrent.ConcurrentMap;
27	–	import java.util.concurrent.ThreadLocalRandom;
28	–	import java.util.concurrent.locks.LockSupport;
29	–	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
27		import java.util.concurrent.atomic.AtomicReference;
28	<
29	<	import java.io.Serializable;
28	>	import java.util.concurrent.atomic.AtomicInteger;
29	>	import java.util.concurrent.locks.LockSupport;
30	>	import java.util.concurrent.locks.ReentrantLock;
31
32		/**
33		* A hash table supporting full concurrency of retrievals and
#	Line 43 | Line 41 | import java.io.Serializable;
41		* interoperable with {@code Hashtable} in programs that rely on its
42		* thread safety but not on its synchronization details.
43		*
44	<	* <p> Retrieval operations (including {@code get}) generally do not
44	>	* <p>Retrieval operations (including {@code get}) generally do not
45		* block, so may overlap with update operations (including {@code put}
46		* and {@code remove}). Retrievals reflect the results of the most
47		* recently <em>completed</em> update operations holding upon their
#	Line 64 | Line 62 | import java.io.Serializable;
62		* that may be adequate for monitoring or estimation purposes, but not
63		* for program control.
64		*
65	<	* <p> The table is dynamically expanded when there are too many
65	>	* <p>The table is dynamically expanded when there are too many
66		* collisions (i.e., keys that have distinct hash codes but fall into
67		* the same slot modulo the table size), with the expected average
68		* effect of maintaining roughly two bins per mapping (corresponding
#	Line 83 | Line 81 | import java.io.Serializable;
81		* expected {@code concurrencyLevel} as an additional hint for
82		* internal sizing.  Note that using many keys with exactly the same
83		* {@code hashCode()} is a sure way to slow down performance of any
84	<	* hash table.
84	>	* hash table. To ameliorate impact, when keys are {@link Comparable},
85	>	* this class may use comparison order among keys to help break ties.
86	>	*
87	>	* <p>A {@link Set} projection of a ConcurrentHashMapV8 may be created
88	>	* (using {@link #newKeySet()} or {@link #newKeySet(int)}), or viewed
89	>	* (using {@link #keySet(Object)} when only keys are of interest, and the
90	>	* mapped values are (perhaps transiently) not used or all take the
91	>	* same mapping value.
92		*
93		* <p>This class and its views and iterators implement all of the
94		* <em>optional</em> methods of the {@link Map} and {@link Iterator}
95		* interfaces.
96		*
97	<	* <p> Like {@link Hashtable} but unlike {@link HashMap}, this class
97	>	* <p>Like {@link Hashtable} but unlike {@link HashMap}, this class
98		* does <em>not</em> allow {@code null} to be used as a key or value.
99		*
100	+	* <p>ConcurrentHashMapV8s support a set of sequential and parallel bulk
101	+	* operations that are designed
102	+	* to be safely, and often sensibly, applied even with maps that are
103	+	* being concurrently updated by other threads; for example, when
104	+	* computing a snapshot summary of the values in a shared registry.
105	+	* There are three kinds of operation, each with four forms, accepting
106	+	* functions with Keys, Values, Entries, and (Key, Value) arguments
107	+	* and/or return values. Because the elements of a ConcurrentHashMapV8
108	+	* are not ordered in any particular way, and may be processed in
109	+	* different orders in different parallel executions, the correctness
110	+	* of supplied functions should not depend on any ordering, or on any
111	+	* other objects or values that may transiently change while
112	+	* computation is in progress; and except for forEach actions, should
113	+	* ideally be side-effect-free. Bulk operations on {@link java.util.Map.Entry}
114	+	* objects do not support method {@code setValue}.
115	+	*
116	+	* <ul>
117	+	* <li> forEach: Perform a given action on each element.
118	+	* A variant form applies a given transformation on each element
119	+	* before performing the action.</li>
120	+	*
121	+	* <li> search: Return the first available non-null result of
122	+	* applying a given function on each element; skipping further
123	+	* search when a result is found.</li>
124	+	*
125	+	* <li> reduce: Accumulate each element.  The supplied reduction
126	+	* function cannot rely on ordering (more formally, it should be
127	+	* both associative and commutative).  There are five variants:
128	+	*
129	+	* <ul>
130	+	*
131	+	* <li> Plain reductions. (There is not a form of this method for
132	+	* (key, value) function arguments since there is no corresponding
133	+	* return type.)</li>
134	+	*
135	+	* <li> Mapped reductions that accumulate the results of a given
136	+	* function applied to each element.</li>
137	+	*
138	+	* <li> Reductions to scalar doubles, longs, and ints, using a
139	+	* given basis value.</li>
140	+	*
141	+	* </ul>
142	+	* </li>
143	+	* </ul>
144	+	*
145	+	* <p>These bulk operations accept a {@code parallelismThreshold}
146	+	* argument. Methods proceed sequentially if the current map size is
147	+	* estimated to be less than the given threshold. Using a value of
148	+	* {@code Long.MAX_VALUE} suppresses all parallelism.  Using a value
149	+	* of {@code 1} results in maximal parallelism by partitioning into
150	+	* enough subtasks to fully utilize the {@link
151	+	* ForkJoinPool#commonPool()} that is used for all parallel
152	+	* computations. Normally, you would initially choose one of these
153	+	* extreme values, and then measure performance of using in-between
154	+	* values that trade off overhead versus throughput.
155	+	*
156	+	* <p>The concurrency properties of bulk operations follow
157	+	* from those of ConcurrentHashMapV8: Any non-null result returned
158	+	* from {@code get(key)} and related access methods bears a
159	+	* happens-before relation with the associated insertion or
160	+	* update.  The result of any bulk operation reflects the
161	+	* composition of these per-element relations (but is not
162	+	* necessarily atomic with respect to the map as a whole unless it
163	+	* is somehow known to be quiescent).  Conversely, because keys
164	+	* and values in the map are never null, null serves as a reliable
165	+	* atomic indicator of the current lack of any result.  To
166	+	* maintain this property, null serves as an implicit basis for
167	+	* all non-scalar reduction operations. For the double, long, and
168	+	* int versions, the basis should be one that, when combined with
169	+	* any other value, returns that other value (more formally, it
170	+	* should be the identity element for the reduction). Most common
171	+	* reductions have these properties; for example, computing a sum
172	+	* with basis 0 or a minimum with basis MAX_VALUE.
173	+	*
174	+	* <p>Search and transformation functions provided as arguments
175	+	* should similarly return null to indicate the lack of any result
176	+	* (in which case it is not used). In the case of mapped
177	+	* reductions, this also enables transformations to serve as
178	+	* filters, returning null (or, in the case of primitive
179	+	* specializations, the identity basis) if the element should not
180	+	* be combined. You can create compound transformations and
181	+	* filterings by composing them yourself under this "null means
182	+	* there is nothing there now" rule before using them in search or
183	+	* reduce operations.
184	+	*
185	+	* <p>Methods accepting and/or returning Entry arguments maintain
186	+	* key-value associations. They may be useful for example when
187	+	* finding the key for the greatest value. Note that "plain" Entry
188	+	* arguments can be supplied using {@code new
189	+	* AbstractMap.SimpleEntry(k,v)}.
190	+	*
191	+	* <p>Bulk operations may complete abruptly, throwing an
192	+	* exception encountered in the application of a supplied
193	+	* function. Bear in mind when handling such exceptions that other
194	+	* concurrently executing functions could also have thrown
195	+	* exceptions, or would have done so if the first exception had
196	+	* not occurred.
197	+	*
198	+	* <p>Speedups for parallel compared to sequential forms are common
199	+	* but not guaranteed.  Parallel operations involving brief functions
200	+	* on small maps may execute more slowly than sequential forms if the
201	+	* underlying work to parallelize the computation is more expensive
202	+	* than the computation itself.  Similarly, parallelization may not
203	+	* lead to much actual parallelism if all processors are busy
204	+	* performing unrelated tasks.
205	+	*
206	+	* <p>All arguments to all task methods must be non-null.
207	+	*
208	+	* <p><em>jsr166e note: During transition, this class
209	+	* uses nested functional interfaces with different names but the
210	+	* same forms as those expected for JDK8.</em>
211	+	*
212		* <p>This class is a member of the
213		* <a href="{@docRoot}/../technotes/guides/collections/index.html">
214		* Java Collections Framework</a>.
215		*
99	–	* <p><em>jsr166e note: This class is a candidate replacement for
100	–	* java.util.concurrent.ConcurrentHashMap.  During transition, this
101	–	* class declares and uses nested functional interfaces with different
102	–	* names but the same forms as those expected for JDK8.<em>
103	–	*
216		* @since 1.5
217		* @author Doug Lea
218		* @param <K> the type of keys maintained by this map
219		* @param <V> the type of mapped values
220		*/
221	<	public class ConcurrentHashMapV8<K, V>
222	<	implements ConcurrentMap<K, V>, Serializable {
221	>	public class ConcurrentHashMapV8<K,V>
222	>	implements ConcurrentMap<K,V>, Serializable {
223		private static final long serialVersionUID = 7249069246763182397L;
224
225		/**
226	<	* A partitionable iterator. A Spliterator can be traversed
227	<	* directly, but can also be partitioned (before traversal) by
228	<	* creating another Spliterator that covers a non-overlapping
117	<	* portion of the elements, and so may be amenable to parallel
118	<	* execution.
119	<	*
120	<	* <p> This interface exports a subset of expected JDK8
121	<	* functionality.
122	<	*
123	<	* <p>Sample usage: Here is one (of the several) ways to compute
124	<	* the sum of the values held in a map using the ForkJoin
125	<	* framework. As illustrated here, Spliterators are well suited to
126	<	* designs in which a task repeatedly splits off half its work
127	<	* into forked subtasks until small enough to process directly,
128	<	* and then joins these subtasks. Variants of this style can also
129	<	* be used in completion-based designs.
130	<	*
131	<	* <pre>
132	<	* {@code ConcurrentHashMapV8<String, Long> m = ...
133	<	* // split as if have 8 * parallelism, for load balance
134	<	* int n = m.size();
135	<	* int p = aForkJoinPool.getParallelism() * 8;
136	<	* int split = (n < p)? n : p;
137	<	* long sum = aForkJoinPool.invoke(new SumValues(m.valueSpliterator(), split, null));
138	<	* // ...
139	<	* static class SumValues extends RecursiveTask<Long> {
140	<	*   final Spliterator<Long> s;
141	<	*   final int split;             // split while > 1
142	<	*   final SumValues nextJoin;    // records forked subtasks to join
143	<	*   SumValues(Spliterator<Long> s, int depth, SumValues nextJoin) {
144	<	*     this.s = s; this.depth = depth; this.nextJoin = nextJoin;
145	<	*   }
146	<	*   public Long compute() {
147	<	*     long sum = 0;
148	<	*     SumValues subtasks = null; // fork subtasks
149	<	*     for (int s = split >>> 1; s > 0; s >>>= 1)
150	<	*       (subtasks = new SumValues(s.split(), s, subtasks)).fork();
151	<	*     while (s.hasNext())        // directly process remaining elements
152	<	*       sum += s.next();
153	<	*     for (SumValues t = subtasks; t != null; t = t.nextJoin)
154	<	*       sum += t.join();         // collect subtask results
155	<	*     return sum;
156	<	*   }
157	<	* }
158	<	* }</pre>
226	>	* An object for traversing and partitioning elements of a source.
227	>	* This interface provides a subset of the functionality of JDK8
228	>	* java.util.Spliterator.
229		*/
230	<	public static interface Spliterator<T> extends Iterator<T> {
230	>	public static interface ConcurrentHashMapSpliterator<T> {
231		/**
232	<	* Returns a Spliterator covering approximately half of the
233	<	* elements, guaranteed not to overlap with those subsequently
234	<	* returned by this Spliterator.  After invoking this method,
235	<	* the current Spliterator will <em>not</em> produce any of
236	<	* the elements of the returned Spliterator, but the two
237	<	* Spliterators together will produce all of the elements that
238	<	* would have been produced by this Spliterator had this
239	<	* method not been called. The exact number of elements
240	<	* produced by the returned Spliterator is not guaranteed, and
171	<	* may be zero (i.e., with {@code hasNext()} reporting {@code
172	<	* false}) if this Spliterator cannot be further split.
173	<	*
174	<	* @return a Spliterator covering approximately half of the
175	<	* elements
176	<	* @throws IllegalStateException if this Spliterator has
177	<	* already commenced traversing elements
232	>	* If possible, returns a new spliterator covering
233	>	* approximately one half of the elements, which will not be
234	>	* covered by this spliterator. Returns null if cannot be
235	>	* split.
236	>	*/
237	>	ConcurrentHashMapSpliterator<T> trySplit();
238	>	/**
239	>	* Returns an estimate of the number of elements covered by
240	>	* this Spliterator.
241		*/
242	<	Spliterator<T> split();
242	>	long estimateSize();
243	>
244	>	/** Applies the action to each untraversed element */
245	>	void forEachRemaining(Action<? super T> action);
246	>	/** If an element remains, applies the action and returns true. */
247	>	boolean tryAdvance(Action<? super T> action);
248		}
249
250	+	// Sams
251	+	/** Interface describing a void action of one argument */
252	+	public interface Action<A> { void apply(A a); }
253	+	/** Interface describing a void action of two arguments */
254	+	public interface BiAction<A,B> { void apply(A a, B b); }
255	+	/** Interface describing a function of one argument */
256	+	public interface Fun<A,T> { T apply(A a); }
257	+	/** Interface describing a function of two arguments */
258	+	public interface BiFun<A,B,T> { T apply(A a, B b); }
259	+	/** Interface describing a function mapping its argument to a double */
260	+	public interface ObjectToDouble<A> { double apply(A a); }
261	+	/** Interface describing a function mapping its argument to a long */
262	+	public interface ObjectToLong<A> { long apply(A a); }
263	+	/** Interface describing a function mapping its argument to an int */
264	+	public interface ObjectToInt<A> {int apply(A a); }
265	+	/** Interface describing a function mapping two arguments to a double */
266	+	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
267	+	/** Interface describing a function mapping two arguments to a long */
268	+	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
269	+	/** Interface describing a function mapping two arguments to an int */
270	+	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
271	+	/** Interface describing a function mapping two doubles to a double */
272	+	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
273	+	/** Interface describing a function mapping two longs to a long */
274	+	public interface LongByLongToLong { long apply(long a, long b); }
275	+	/** Interface describing a function mapping two ints to an int */
276	+	public interface IntByIntToInt { int apply(int a, int b); }
277	+
278		/*
279		* Overview:
280		*
#	Line 189 | Line 285 | public class ConcurrentHashMapV8<K, V>
285		* the same or better than java.util.HashMap, and to support high
286		* initial insertion rates on an empty table by many threads.
287		*
288	<	* Each key-value mapping is held in a Node.  Because Node fields
289	<	* can contain special values, they are defined using plain Object
290	<	* types. Similarly in turn, all internal methods that use them
291	<	* work off Object types. And similarly, so do the internal
292	<	* methods of auxiliary iterator and view classes.  All public
293	<	* generic typed methods relay in/out of these internal methods,
294	<	* supplying null-checks and casts as needed. This also allows
295	<	* many of the public methods to be factored into a smaller number
296	<	* of internal methods (although sadly not so for the five
297	<	* variants of put-related operations). The validation-based
298	<	* approach explained below leads to a lot of code sprawl because
299	<	* retry-control precludes factoring into smaller methods.
288	>	* This map usually acts as a binned (bucketed) hash table.  Each
289	>	* key-value mapping is held in a Node.  Most nodes are instances
290	>	* of the basic Node class with hash, key, value, and next
291	>	* fields. However, various subclasses exist: TreeNodes are
292	>	* arranged in balanced trees, not lists.  TreeBins hold the roots
293	>	* of sets of TreeNodes. ForwardingNodes are placed at the heads
294	>	* of bins during resizing. ReservationNodes are used as
295	>	* placeholders while establishing values in computeIfAbsent and
296	>	* related methods.  The types TreeBin, ForwardingNode, and
297	>	* ReservationNode do not hold normal user keys, values, or
298	>	* hashes, and are readily distinguishable during search etc
299	>	* because they have negative hash fields and null key and value
300	>	* fields. (These special nodes are either uncommon or transient,
301	>	* so the impact of carrying around some unused fields is
302	>	* insignificant.)
303		*
304		* The table is lazily initialized to a power-of-two size upon the
305		* first insertion.  Each bin in the table normally contains a
#	Line 208 | Line 307 | public class ConcurrentHashMapV8<K, V>
307		* Table accesses require volatile/atomic reads, writes, and
308		* CASes.  Because there is no other way to arrange this without
309		* adding further indirections, we use intrinsics
310	<	* (sun.misc.Unsafe) operations.  The lists of nodes within bins
311	<	* are always accurately traversable under volatile reads, so long
312	<	* as lookups check hash code and non-nullness of value before
313	<	* checking key equality.
314	<	*
315	<	* We use the top two bits of Node hash fields for control
217	<	* purposes -- they are available anyway because of addressing
218	<	* constraints.  As explained further below, these top bits are
219	<	* used as follows:
220	<	*  00 - Normal
221	<	*  01 - Locked
222	<	*  11 - Locked and may have a thread waiting for lock
223	<	*  10 - Node is a forwarding node
224	<	*
225	<	* The lower 30 bits of each Node's hash field contain a
226	<	* transformation of the key's hash code, except for forwarding
227	<	* nodes, for which the lower bits are zero (and so always have
228	<	* hash field == MOVED).
310	>	* (sun.misc.Unsafe) operations.
311	>	*
312	>	* We use the top (sign) bit of Node hash fields for control
313	>	* purposes -- it is available anyway because of addressing
314	>	* constraints.  Nodes with negative hash fields are specially
315	>	* handled or ignored in map methods.
316		*
317		* Insertion (via put or its variants) of the first node in an
318		* empty bin is performed by just CASing it to the bin.  This is
#	Line 234 | Line 321 | public class ConcurrentHashMapV8<K, V>
321		* delete, and replace) require locks.  We do not want to waste
322		* the space required to associate a distinct lock object with
323		* each bin, so instead use the first node of a bin list itself as
324	<	* a lock. Blocking support for these locks relies on the builtin
325	<	* "synchronized" monitors.  However, we also need a tryLock
239	<	* construction, so we overlay these by using bits of the Node
240	<	* hash field for lock control (see above), and so normally use
241	<	* builtin monitors only for blocking and signalling using
242	<	* wait/notifyAll constructions. See Node.tryAwaitLock.
324	>	* a lock. Locking support for these locks relies on builtin
325	>	* "synchronized" monitors.
326		*
327		* Using the first node of a list as a lock does not by itself
328		* suffice though: When a node is locked, any update must first
329		* validate that it is still the first node after locking it, and
330		* retry if not. Because new nodes are always appended to lists,
331		* once a node is first in a bin, it remains first until deleted
332	<	* or the bin becomes invalidated (upon resizing).  However,
250	<	* operations that only conditionally update may inspect nodes
251	<	* until the point of update. This is a converse of sorts to the
252	<	* lazy locking technique described by Herlihy & Shavit.
332	>	* or the bin becomes invalidated (upon resizing).
333		*
334		* The main disadvantage of per-bin locks is that other update
335		* operations on other nodes in a bin list protected by the same
#	Line 282 | Line 362 | public class ConcurrentHashMapV8<K, V>
362		* sometimes deviate significantly from uniform randomness.  This
363		* includes the case when N > (1<<30), so some keys MUST collide.
364		* Similarly for dumb or hostile usages in which multiple keys are
365	<	* designed to have identical hash codes. Also, although we guard
366	<	* against the worst effects of this (see method spread), sets of
367	<	* hashes may differ only in bits that do not impact their bin
368	<	* index for a given power-of-two mask.  So we use a secondary
369	<	* strategy that applies when the number of nodes in a bin exceeds
370	<	* a threshold, and at least one of the keys implements
291	<	* Comparable.  These TreeBins use a balanced tree to hold nodes
292	<	* (a specialized form of red-black trees), bounding search time
293	<	* to O(log N).  Each search step in a TreeBin is around twice as
365	>	* designed to have identical hash codes or ones that differs only
366	>	* in masked-out high bits. So we use a secondary strategy that
367	>	* applies when the number of nodes in a bin exceeds a
368	>	* threshold. These TreeBins use a balanced tree to hold nodes (a
369	>	* specialized form of red-black trees), bounding search time to
370	>	* O(log N).  Each search step in a TreeBin is at least twice as
371		* slow as in a regular list, but given that N cannot exceed
372		* (1<<64) (before running out of addresses) this bounds search
373		* steps, lock hold times, etc, to reasonable constants (roughly
#	Line 301 | Line 378 | public class ConcurrentHashMapV8<K, V>
378		* iterators in the same way.
379		*
380		* The table is resized when occupancy exceeds a percentage
381	<	* threshold (nominally, 0.75, but see below).  Only a single
382	<	* thread performs the resize (using field "sizeCtl", to arrange
383	<	* exclusion), but the table otherwise remains usable for reads
384	<	* and updates. Resizing proceeds by transferring bins, one by
385	<	* one, from the table to the next table.  Because we are using
386	<	* power-of-two expansion, the elements from each bin must either
387	<	* stay at same index, or move with a power of two offset. We
388	<	* eliminate unnecessary node creation by catching cases where old
389	<	* nodes can be reused because their next fields won't change.  On
390	<	* average, only about one-sixth of them need cloning when a table
391	<	* doubles. The nodes they replace will be garbage collectable as
392	<	* soon as they are no longer referenced by any reader thread that
393	<	* may be in the midst of concurrently traversing table.  Upon
394	<	* transfer, the old table bin contains only a special forwarding
395	<	* node (with hash field "MOVED") that contains the next table as
396	<	* its key. On encountering a forwarding node, access and update
397	<	* operations restart, using the new table.
398	<	*
399	<	* Each bin transfer requires its bin lock. However, unlike other
400	<	* cases, a transfer can skip a bin if it fails to acquire its
401	<	* lock, and revisit it later (unless it is a TreeBin). Method
402	<	* rebuild maintains a buffer of TRANSFER_BUFFER_SIZE bins that
403	<	* have been skipped because of failure to acquire a lock, and
404	<	* blocks only if none are available (i.e., only very rarely).
405	<	* The transfer operation must also ensure that all accessible
406	<	* bins in both the old and new table are usable by any traversal.
407	<	* When there are no lock acquisition failures, this is arranged
408	<	* simply by proceeding from the last bin (table.length - 1) up
409	<	* towards the first.  Upon seeing a forwarding node, traversals
410	<	* (see class Iter) arrange to move to the new table
411	<	* without revisiting nodes.  However, when any node is skipped
412	<	* during a transfer, all earlier table bins may have become
413	<	* visible, so are initialized with a reverse-forwarding node back
414	<	* to the old table until the new ones are established. (This
415	<	* sometimes requires transiently locking a forwarding node, which
416	<	* is possible under the above encoding.) These more expensive
417	<	* mechanics trigger only when necessary.
381	>	* threshold (nominally, 0.75, but see below).  Any thread
382	>	* noticing an overfull bin may assist in resizing after the
383	>	* initiating thread allocates and sets up the replacement
384	>	* array. However, rather than stalling, these other threads may
385	>	* proceed with insertions etc.  The use of TreeBins shields us
386	>	* from the worst case effects of overfilling while resizes are in
387	>	* progress.  Resizing proceeds by transferring bins, one by one,
388	>	* from the table to the next table. To enable concurrency, the
389	>	* next table must be (incrementally) prefilled with place-holders
390	>	* serving as reverse forwarders to the old table.  Because we are
391	>	* using power-of-two expansion, the elements from each bin must
392	>	* either stay at same index, or move with a power of two
393	>	* offset. We eliminate unnecessary node creation by catching
394	>	* cases where old nodes can be reused because their next fields
395	>	* won't change.  On average, only about one-sixth of them need
396	>	* cloning when a table doubles. The nodes they replace will be
397	>	* garbage collectable as soon as they are no longer referenced by
398	>	* any reader thread that may be in the midst of concurrently
399	>	* traversing table.  Upon transfer, the old table bin contains
400	>	* only a special forwarding node (with hash field "MOVED") that
401	>	* contains the next table as its key. On encountering a
402	>	* forwarding node, access and update operations restart, using
403	>	* the new table.
404	>	*
405	>	* Each bin transfer requires its bin lock, which can stall
406	>	* waiting for locks while resizing. However, because other
407	>	* threads can join in and help resize rather than contend for
408	>	* locks, average aggregate waits become shorter as resizing
409	>	* progresses.  The transfer operation must also ensure that all
410	>	* accessible bins in both the old and new table are usable by any
411	>	* traversal.  This is arranged by proceeding from the last bin
412	>	* (table.length - 1) up towards the first.  Upon seeing a
413	>	* forwarding node, traversals (see class Traverser) arrange to
414	>	* move to the new table without revisiting nodes.  However, to
415	>	* ensure that no intervening nodes are skipped, bin splitting can
416	>	* only begin after the associated reverse-forwarders are in
417	>	* place.
418		*
419		* The traversal scheme also applies to partial traversals of
420		* ranges of bins (via an alternate Traverser constructor)
#	Line 352 | Line 429 | public class ConcurrentHashMapV8<K, V>
429		* These cases attempt to override the initial capacity settings,
430		* but harmlessly fail to take effect in cases of races.
431		*
432	<	* The element count is maintained using a LongAdder, which avoids
433	<	* contention on updates but can encounter cache thrashing if read
434	<	* too frequently during concurrent access. To avoid reading so
435	<	* often, resizing is attempted either when a bin lock is
436	<	* contended, or upon adding to a bin already holding two or more
437	<	* nodes (checked before adding in the xIfAbsent methods, after
438	<	* adding in others). Under uniform hash distributions, the
439	<	* probability of this occurring at threshold is around 13%,
440	<	* meaning that only about 1 in 8 puts check threshold (and after
441	<	* resizing, many fewer do so). But this approximation has high
442	<	* variance for small table sizes, so we check on any collision
443	<	* for sizes <= 64. The bulk putAll operation further reduces
444	<	* contention by only committing count updates upon these size
445	<	* checks.
432	>	* The element count is maintained using a specialization of
433	>	* LongAdder. We need to incorporate a specialization rather than
434	>	* just use a LongAdder in order to access implicit
435	>	* contention-sensing that leads to creation of multiple
436	>	* CounterCells.  The counter mechanics avoid contention on
437	>	* updates but can encounter cache thrashing if read too
438	>	* frequently during concurrent access. To avoid reading so often,
439	>	* resizing under contention is attempted only upon adding to a
440	>	* bin already holding two or more nodes. Under uniform hash
441	>	* distributions, the probability of this occurring at threshold
442	>	* is around 13%, meaning that only about 1 in 8 puts check
443	>	* threshold (and after resizing, many fewer do so).
444	>	*
445	>	* TreeBins use a special form of comparison for search and
446	>	* related operations (which is the main reason we cannot use
447	>	* existing collections such as TreeMaps). TreeBins contain
448	>	* Comparable elements, but may contain others, as well as
449	>	* elements that are Comparable but not necessarily Comparable
450	>	* for the same T, so we cannot invoke compareTo among them. To
451	>	* handle this, the tree is ordered primarily by hash value, then
452	>	* by Comparable.compareTo order if applicable.  On lookup at a
453	>	* node, if elements are not comparable or compare as 0 then both
454	>	* left and right children may need to be searched in the case of
455	>	* tied hash values. (This corresponds to the full list search
456	>	* that would be necessary if all elements were non-Comparable and
457	>	* had tied hashes.)  The red-black balancing code is updated from
458	>	* pre-jdk-collections
459	>	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
460	>	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
461	>	* Algorithms" (CLR).
462	>	*
463	>	* TreeBins also require an additional locking mechanism.  While
464	>	* list traversal is always possible by readers even during
465	>	* updates, tree traversal is not, mainly because of tree-rotations
466	>	* that may change the root node and/or its linkages.  TreeBins
467	>	* include a simple read-write lock mechanism parasitic on the
468	>	* main bin-synchronization strategy: Structural adjustments
469	>	* associated with an insertion or removal are already bin-locked
470	>	* (and so cannot conflict with other writers) but must wait for
471	>	* ongoing readers to finish. Since there can be only one such
472	>	* waiter, we use a simple scheme using a single "waiter" field to
473	>	* block writers.  However, readers need never block.  If the root
474	>	* lock is held, they proceed along the slow traversal path (via
475	>	* next-pointers) until the lock becomes available or the list is
476	>	* exhausted, whichever comes first. These cases are not fast, but
477	>	* maximize aggregate expected throughput.
478		*
479		* Maintaining API and serialization compatibility with previous
480		* versions of this class introduces several oddities. Mainly: We
#	Line 375 | Line 484 | public class ConcurrentHashMapV8<K, V>
484		* time that we can guarantee to honor it.) We also declare an
485		* unused "Segment" class that is instantiated in minimal form
486		* only when serializing.
487	+	*
488	+	* This file is organized to make things a little easier to follow
489	+	* while reading than they might otherwise: First the main static
490	+	* declarations and utilities, then fields, then main public
491	+	* methods (with a few factorings of multiple public methods into
492	+	* internal ones), then sizing methods, trees, traversers, and
493	+	* bulk operations.
494		*/
495
496		/* ---------------- Constants -------------- */
#	Line 416 | Line 532 | public class ConcurrentHashMapV8<K, V>
532		private static final float LOAD_FACTOR = 0.75f;
533
534		/**
419	–	* The buffer size for skipped bins during transfers. The
420	–	* value is arbitrary but should be large enough to avoid
421	–	* most locking stalls during resizes.
422	–	*/
423	–	private static final int TRANSFER_BUFFER_SIZE = 32;
424	–
425	–	/**
535		* The bin count threshold for using a tree rather than list for a
536	<	* bin.  The value reflects the approximate break-even point for
537	<	* using tree-based operations.
536	>	* bin.  Bins are converted to trees when adding an element to a
537	>	* bin with at least this many nodes. The value must be greater
538	>	* than 2, and should be at least 8 to mesh with assumptions in
539	>	* tree removal about conversion back to plain bins upon
540	>	* shrinkage.
541		*/
542	<	private static final int TREE_THRESHOLD = 8;
431	<
432	<	/*
433	<	* Encodings for special uses of Node hash fields. See above for
434	<	* explanation.
435	<	*/
436	<	static final int MOVED     = 0x80000000; // hash field for forwarding nodes
437	<	static final int LOCKED    = 0x40000000; // set/tested only as a bit
438	<	static final int WAITING   = 0xc0000000; // both bits set/tested together
439	<	static final int HASH_BITS = 0x3fffffff; // usable bits of normal node hash
440	<
441	<	/* ---------------- Fields -------------- */
542	>	static final int TREEIFY_THRESHOLD = 8;
543
544		/**
545	<	* The array of bins. Lazily initialized upon first insertion.
546	<	* Size is always a power of two. Accessed directly by iterators.
545	>	* The bin count threshold for untreeifying a (split) bin during a
546	>	* resize operation. Should be less than TREEIFY_THRESHOLD, and at
547	>	* most 6 to mesh with shrinkage detection under removal.
548		*/
549	<	transient volatile Node[] table;
549	>	static final int UNTREEIFY_THRESHOLD = 6;
550
551		/**
552	<	* The counter maintaining number of elements.
552	>	* The smallest table capacity for which bins may be treeified.
553	>	* (Otherwise the table is resized if too many nodes in a bin.)
554	>	* The value should be at least 4 * TREEIFY_THRESHOLD to avoid
555	>	* conflicts between resizing and treeification thresholds.
556		*/
557	<	private transient final LongAdder counter;
557	>	static final int MIN_TREEIFY_CAPACITY = 64;
558
559		/**
560	<	* Table initialization and resizing control.  When negative, the
561	<	* table is being initialized or resized. Otherwise, when table is
562	<	* null, holds the initial table size to use upon creation, or 0
563	<	* for default. After initialization, holds the next element count
564	<	* value upon which to resize the table.
560	>	* Minimum number of rebinnings per transfer step. Ranges are
561	>	* subdivided to allow multiple resizer threads.  This value
562	>	* serves as a lower bound to avoid resizers encountering
563	>	* excessive memory contention.  The value should be at least
564	>	* DEFAULT_CAPACITY.
565		*/
566	<	private transient volatile int sizeCtl;
462	<
463	<	// views
464	<	private transient KeySet<K,V> keySet;
465	<	private transient Values<K,V> values;
466	<	private transient EntrySet<K,V> entrySet;
467	<
468	<	/** For serialization compatibility. Null unless serialized; see below */
469	<	private Segment<K,V>[] segments;
470	<
471	<	/* ---------------- Table element access -------------- */
566	>	private static final int MIN_TRANSFER_STRIDE = 16;
567
568		/*
569	<	* Volatile access methods are used for table elements as well as
475	<	* elements of in-progress next table while resizing.  Uses are
476	<	* null checked by callers, and implicitly bounds-checked, relying
477	<	* on the invariants that tab arrays have non-zero size, and all
478	<	* indices are masked with (tab.length - 1) which is never
479	<	* negative and always less than length. Note that, to be correct
480	<	* wrt arbitrary concurrency errors by users, bounds checks must
481	<	* operate on local variables, which accounts for some odd-looking
482	<	* inline assignments below.
569	>	* Encodings for Node hash fields. See above for explanation.
570		*/
571	<
572	<	static final Node tabAt(Node[] tab, int i) { // used by Iter
573	<	return (Node)UNSAFE.getObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE);
574	<	}
575	<
576	<	private static final boolean casTabAt(Node[] tab, int i, Node c, Node v) {
577	<	return UNSAFE.compareAndSwapObject(tab, ((long)i<<ASHIFT)+ABASE, c, v);
578	<	}
579	<
580	<	private static final void setTabAt(Node[] tab, int i, Node v) {
581	<	UNSAFE.putObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE, v);
582	<	}
571	>	static final int MOVED     = 0x8fffffff; // (-1) hash for forwarding nodes
572	>	static final int TREEBIN   = 0x80000000; // hash for roots of trees
573	>	static final int RESERVED  = 0x80000001; // hash for transient reservations
574	>	static final int HASH_BITS = 0x7fffffff; // usable bits of normal node hash
575	>
576	>	/** Number of CPUS, to place bounds on some sizings */
577	>	static final int NCPU = Runtime.getRuntime().availableProcessors();
578	>
579	>	/** For serialization compatibility. */
580	>	private static final ObjectStreamField[] serialPersistentFields = {
581	>	new ObjectStreamField("segments", Segment[].class),
582	>	new ObjectStreamField("segmentMask", Integer.TYPE),
583	>	new ObjectStreamField("segmentShift", Integer.TYPE)
584	>	};
585
586		/* ---------------- Nodes -------------- */
587
588		/**
589	<	* Key-value entry. Note that this is never exported out as a
590	<	* user-visible Map.Entry (see MapEntry below). Nodes with a hash
591	<	* field of MOVED are special, and do not contain user keys or
592	<	* values.  Otherwise, keys are never null, and null val fields
593	<	* indicate that a node is in the process of being deleted or
594	<	* created. For purposes of read-only access, a key may be read
595	<	* before a val, but can only be used after checking val to be
596	<	* non-null.
597	<	*/
598	<	static class Node {
599	<	volatile int hash;
600	<	final Object key;
512	<	volatile Object val;
513	<	volatile Node next;
589	>	* Key-value entry.  This class is never exported out as a
590	>	* user-mutable Map.Entry (i.e., one supporting setValue; see
591	>	* MapEntry below), but can be used for read-only traversals used
592	>	* in bulk tasks.  Subclasses of Node with a negative hash field
593	>	* are special, and contain null keys and values (but are never
594	>	* exported).  Otherwise, keys and vals are never null.
595	>	*/
596	>	static class Node<K,V> implements Map.Entry<K,V> {
597	>	final int hash;
598	>	final K key;
599	>	volatile V val;
600	>	Node<K,V> next;
601
602	<	Node(int hash, Object key, Object val, Node next) {
602	>	Node(int hash, K key, V val, Node<K,V> next) {
603		this.hash = hash;
604		this.key = key;
605		this.val = val;
606		this.next = next;
607		}
608
609	<	/** CompareAndSet the hash field */
610	<	final boolean casHash(int cmp, int val) {
611	<	return UNSAFE.compareAndSwapInt(this, hashOffset, cmp, val);
612	<	}
613	<
614	<	/** The number of spins before blocking for a lock */
528	<	static final int MAX_SPINS =
529	<	Runtime.getRuntime().availableProcessors() > 1 ? 64 : 1;
530	<
531	<	/**
532	<	* Spins a while if LOCKED bit set and this node is the first
533	<	* of its bin, and then sets WAITING bits on hash field and
534	<	* blocks (once) if they are still set.  It is OK for this
535	<	* method to return even if lock is not available upon exit,
536	<	* which enables these simple single-wait mechanics.
537	<	*
538	<	* The corresponding signalling operation is performed within
539	<	* callers: Upon detecting that WAITING has been set when
540	<	* unlocking lock (via a failed CAS from non-waiting LOCKED
541	<	* state), unlockers acquire the sync lock and perform a
542	<	* notifyAll.
543	<	*
544	<	* The initial sanity check on tab and bounds is not currently
545	<	* necessary in the only usages of this method, but enables
546	<	* use in other future contexts.
547	<	*/
548	<	final void tryAwaitLock(Node[] tab, int i) {
549	<	if (tab != null && i >= 0 && i < tab.length) { // sanity check
550	<	int r = ThreadLocalRandom.current().nextInt(); // randomize spins
551	<	int spins = MAX_SPINS, h;
552	<	while (tabAt(tab, i) == this && ((h = hash) & LOCKED) != 0) {
553	<	if (spins >= 0) {
554	<	r ^= r << 1; r ^= r >>> 3; r ^= r << 10; // xorshift
555	<	if (r >= 0 && --spins == 0)
556	<	Thread.yield();  // yield before block
557	<	}
558	<	else if (casHash(h, h | WAITING)) {
559	<	synchronized (this) {
560	<	if (tabAt(tab, i) == this &&
561	<	(hash & WAITING) == WAITING) {
562	<	try {
563	<	wait();
564	<	} catch (InterruptedException ie) {
565	<	Thread.currentThread().interrupt();
566	<	}
567	<	}
568	<	else
569	<	notifyAll(); // possibly won race vs signaller
570	<	}
571	<	break;
572	<	}
573	<	}
574	<	}
575	<	}
576	<
577	<	// Unsafe mechanics for casHash
578	<	private static final sun.misc.Unsafe UNSAFE;
579	<	private static final long hashOffset;
580	<
581	<	static {
582	<	try {
583	<	UNSAFE = getUnsafe();
584	<	Class<?> k = Node.class;
585	<	hashOffset = UNSAFE.objectFieldOffset
586	<	(k.getDeclaredField("hash"));
587	<	} catch (Exception e) {
588	<	throw new Error(e);
589	<	}
590	<	}
591	<	}
592	<
593	<	/* ---------------- TreeBins -------------- */
594	<
595	<	/**
596	<	* Nodes for use in TreeBins
597	<	*/
598	<	static final class TreeNode extends Node {
599	<	TreeNode parent;  // red-black tree links
600	<	TreeNode left;
601	<	TreeNode right;
602	<	TreeNode prev;    // needed to unlink next upon deletion
603	<	boolean red;
604	<
605	<	TreeNode(int hash, Object key, Object val, Node next, TreeNode parent) {
606	<	super(hash, key, val, next);
607	<	this.parent = parent;
608	<	}
609	<	}
610	<
611	<	/**
612	<	* A specialized form of red-black tree for use in bins
613	<	* whose size exceeds a threshold.
614	<	*
615	<	* TreeBins use a special form of comparison for search and
616	<	* related operations (which is the main reason we cannot use
617	<	* existing collections such as TreeMaps). TreeBins contain
618	<	* Comparable elements, but may contain others, as well as
619	<	* elements that are Comparable but not necessarily Comparable<T>
620	<	* for the same T, so we cannot invoke compareTo among them. To
621	<	* handle this, the tree is ordered primarily by hash value, then
622	<	* by getClass().getName() order, and then by Comparator order
623	<	* among elements of the same class.  On lookup at a node, if
624	<	* elements are not comparable or compare as 0, both left and
625	<	* right children may need to be searched in the case of tied hash
626	<	* values. (This corresponds to the full list search that would be
627	<	* necessary if all elements were non-Comparable and had tied
628	<	* hashes.)  The red-black balancing code is updated from
629	<	* pre-jdk-collections
630	<	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
631	<	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
632	<	* Algorithms" (CLR).
633	<	*
634	<	* TreeBins also maintain a separate locking discipline than
635	<	* regular bins. Because they are forwarded via special MOVED
636	<	* nodes at bin heads (which can never change once established),
637	<	* we cannot use those nodes as locks. Instead, TreeBin
638	<	* extends AbstractQueuedSynchronizer to support a simple form of
639	<	* read-write lock. For update operations and table validation,
640	<	* the exclusive form of lock behaves in the same way as bin-head
641	<	* locks. However, lookups use shared read-lock mechanics to allow
642	<	* multiple readers in the absence of writers.  Additionally,
643	<	* these lookups do not ever block: While the lock is not
644	<	* available, they proceed along the slow traversal path (via
645	<	* next-pointers) until the lock becomes available or the list is
646	<	* exhausted, whichever comes first. (These cases are not fast,
647	<	* but maximize aggregate expected throughput.)  The AQS mechanics
648	<	* for doing this are straightforward.  The lock state is held as
649	<	* AQS getState().  Read counts are negative; the write count (1)
650	<	* is positive.  There are no signalling preferences among readers
651	<	* and writers. Since we don't need to export full Lock API, we
652	<	* just override the minimal AQS methods and use them directly.
653	<	*/
654	<	static final class TreeBin extends AbstractQueuedSynchronizer {
655	<	private static final long serialVersionUID = 2249069246763182397L;
656	<	transient TreeNode root;  // root of tree
657	<	transient TreeNode first; // head of next-pointer list
658	<
659	<	/* AQS overrides */
660	<	public final boolean isHeldExclusively() { return getState() > 0; }
661	<	public final boolean tryAcquire(int ignore) {
662	<	if (compareAndSetState(0, 1)) {
663	<	setExclusiveOwnerThread(Thread.currentThread());
664	<	return true;
665	<	}
666	<	return false;
667	<	}
668	<	public final boolean tryRelease(int ignore) {
669	<	setExclusiveOwnerThread(null);
670	<	setState(0);
671	<	return true;
672	<	}
673	<	public final int tryAcquireShared(int ignore) {
674	<	for (int c;;) {
675	<	if ((c = getState()) > 0)
676	<	return -1;
677	<	if (compareAndSetState(c, c -1))
678	<	return 1;
679	<	}
680	<	}
681	<	public final boolean tryReleaseShared(int ignore) {
682	<	int c;
683	<	do {} while (!compareAndSetState(c = getState(), c + 1));
684	<	return c == -1;
685	<	}
686	<
687	<	/** From CLR */
688	<	private void rotateLeft(TreeNode p) {
689	<	if (p != null) {
690	<	TreeNode r = p.right, pp, rl;
691	<	if ((rl = p.right = r.left) != null)
692	<	rl.parent = p;
693	<	if ((pp = r.parent = p.parent) == null)
694	<	root = r;
695	<	else if (pp.left == p)
696	<	pp.left = r;
697	<	else
698	<	pp.right = r;
699	<	r.left = p;
700	<	p.parent = r;
701	<	}
702	<	}
703	<
704	<	/** From CLR */
705	<	private void rotateRight(TreeNode p) {
706	<	if (p != null) {
707	<	TreeNode l = p.left, pp, lr;
708	<	if ((lr = p.left = l.right) != null)
709	<	lr.parent = p;
710	<	if ((pp = l.parent = p.parent) == null)
711	<	root = l;
712	<	else if (pp.right == p)
713	<	pp.right = l;
714	<	else
715	<	pp.left = l;
716	<	l.right = p;
717	<	p.parent = l;
718	<	}
719	<	}
720	<
721	<	/**
722	<	* Returns the TreeNode (or null if not found) for the given key
723	<	* starting at given root.
724	<	*/
725	<	@SuppressWarnings("unchecked") final TreeNode getTreeNode
726	<	(int h, Object k, TreeNode p) {
727	<	Class<?> c = k.getClass();
728	<	while (p != null) {
729	<	int dir, ph;  Object pk; Class<?> pc;
730	<	if ((ph = p.hash) == h) {
731	<	if ((pk = p.key) == k || k.equals(pk))
732	<	return p;
733	<	if (c != (pc = pk.getClass()) ||
734	<	!(k instanceof Comparable) ||
735	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
736	<	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
737	<	TreeNode r = null, s = null, pl, pr;
738	<	if (dir >= 0) {
739	<	if ((pl = p.left) != null && h <= pl.hash)
740	<	s = pl;
741	<	}
742	<	else if ((pr = p.right) != null && h >= pr.hash)
743	<	s = pr;
744	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
745	<	return r;
746	<	}
747	<	}
748	<	else
749	<	dir = (h < ph) ? -1 : 1;
750	<	p = (dir > 0) ? p.right : p.left;
751	<	}
752	<	return null;
609	>	public final K getKey()       { return key; }
610	>	public final V getValue()     { return val; }
611	>	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
612	>	public final String toString(){ return key + "=" + val; }
613	>	public final V setValue(V value) {
614	>	throw new UnsupportedOperationException();
615		}
616
617	<	/**
618	<	* Wrapper for getTreeNode used by CHM.get. Tries to obtain
619	<	* read-lock to call getTreeNode, but during failure to get
620	<	* lock, searches along next links.
621	<	*/
622	<	final Object getValue(int h, Object k) {
623	<	Node r = null;
762	<	int c = getState(); // Must read lock state first
763	<	for (Node e = first; e != null; e = e.next) {
764	<	if (c <= 0 && compareAndSetState(c, c - 1)) {
765	<	try {
766	<	r = getTreeNode(h, k, root);
767	<	} finally {
768	<	releaseShared(0);
769	<	}
770	<	break;
771	<	}
772	<	else if ((e.hash & HASH_BITS) == h && k.equals(e.key)) {
773	<	r = e;
774	<	break;
775	<	}
776	<	else
777	<	c = getState();
778	<	}
779	<	return r == null ? null : r.val;
617	>	public final boolean equals(Object o) {
618	>	Object k, v, u; Map.Entry<?,?> e;
619	>	return ((o instanceof Map.Entry) &&
620	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
621	>	(v = e.getValue()) != null &&
622	>	(k == key || k.equals(key)) &&
623	>	(v == (u = val) || v.equals(u)));
624		}
625
626		/**
627	<	* Finds or adds a node.
784	<	* @return null if added
627	>	* Virtualized support for map.get(); overridden in subclasses.
628		*/
629	<	@SuppressWarnings("unchecked") final TreeNode putTreeNode
630	<	(int h, Object k, Object v) {
631	<	Class<?> c = k.getClass();
632	<	TreeNode pp = root, p = null;
633	<	int dir = 0;
634	<	while (pp != null) { // find existing node or leaf to insert at
635	<	int ph;  Object pk; Class<?> pc;
636	<	p = pp;
637	<	if ((ph = p.hash) == h) {
795	<	if ((pk = p.key) == k || k.equals(pk))
796	<	return p;
797	<	if (c != (pc = pk.getClass()) ||
798	<	!(k instanceof Comparable) ||
799	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
800	<	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
801	<	TreeNode r = null, s = null, pl, pr;
802	<	if (dir >= 0) {
803	<	if ((pl = p.left) != null && h <= pl.hash)
804	<	s = pl;
805	<	}
806	<	else if ((pr = p.right) != null && h >= pr.hash)
807	<	s = pr;
808	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
809	<	return r;
810	<	}
811	<	}
812	<	else
813	<	dir = (h < ph) ? -1 : 1;
814	<	pp = (dir > 0) ? p.right : p.left;
815	<	}
816	<
817	<	TreeNode f = first;
818	<	TreeNode x = first = new TreeNode(h, k, v, f, p);
819	<	if (p == null)
820	<	root = x;
821	<	else { // attach and rebalance; adapted from CLR
822	<	TreeNode xp, xpp;
823	<	if (f != null)
824	<	f.prev = x;
825	<	if (dir <= 0)
826	<	p.left = x;
827	<	else
828	<	p.right = x;
829	<	x.red = true;
830	<	while (x != null && (xp = x.parent) != null && xp.red &&
831	<	(xpp = xp.parent) != null) {
832	<	TreeNode xppl = xpp.left;
833	<	if (xp == xppl) {
834	<	TreeNode y = xpp.right;
835	<	if (y != null && y.red) {
836	<	y.red = false;
837	<	xp.red = false;
838	<	xpp.red = true;
839	<	x = xpp;
840	<	}
841	<	else {
842	<	if (x == xp.right) {
843	<	rotateLeft(x = xp);
844	<	xpp = (xp = x.parent) == null ? null : xp.parent;
845	<	}
846	<	if (xp != null) {
847	<	xp.red = false;
848	<	if (xpp != null) {
849	<	xpp.red = true;
850	<	rotateRight(xpp);
851	<	}
852	<	}
853	<	}
854	<	}
855	<	else {
856	<	TreeNode y = xppl;
857	<	if (y != null && y.red) {
858	<	y.red = false;
859	<	xp.red = false;
860	<	xpp.red = true;
861	<	x = xpp;
862	<	}
863	<	else {
864	<	if (x == xp.left) {
865	<	rotateRight(x = xp);
866	<	xpp = (xp = x.parent) == null ? null : xp.parent;
867	<	}
868	<	if (xp != null) {
869	<	xp.red = false;
870	<	if (xpp != null) {
871	<	xpp.red = true;
872	<	rotateLeft(xpp);
873	<	}
874	<	}
875	<	}
876	<	}
877	<	}
878	<	TreeNode r = root;
879	<	if (r != null && r.red)
880	<	r.red = false;
629	>	Node<K,V> find(int h, Object k) {
630	>	Node<K,V> e = this;
631	>	if (k != null) {
632	>	do {
633	>	K ek;
634	>	if (e.hash == h &&
635	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
636	>	return e;
637	>	} while ((e = e.next) != null);
638		}
639		return null;
640		}
884	–
885	–	/**
886	–	* Removes the given node, that must be present before this
887	–	* call.  This is messier than typical red-black deletion code
888	–	* because we cannot swap the contents of an interior node
889	–	* with a leaf successor that is pinned by "next" pointers
890	–	* that are accessible independently of lock. So instead we
891	–	* swap the tree linkages.
892	–	*/
893	–	final void deleteTreeNode(TreeNode p) {
894	–	TreeNode next = (TreeNode)p.next; // unlink traversal pointers
895	–	TreeNode pred = p.prev;
896	–	if (pred == null)
897	–	first = next;
898	–	else
899	–	pred.next = next;
900	–	if (next != null)
901	–	next.prev = pred;
902	–	TreeNode replacement;
903	–	TreeNode pl = p.left;
904	–	TreeNode pr = p.right;
905	–	if (pl != null && pr != null) {
906	–	TreeNode s = pr, sl;
907	–	while ((sl = s.left) != null) // find successor
908	–	s = sl;
909	–	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
910	–	TreeNode sr = s.right;
911	–	TreeNode pp = p.parent;
912	–	if (s == pr) { // p was s's direct parent
913	–	p.parent = s;
914	–	s.right = p;
915	–	}
916	–	else {
917	–	TreeNode sp = s.parent;
918	–	if ((p.parent = sp) != null) {
919	–	if (s == sp.left)
920	–	sp.left = p;
921	–	else
922	–	sp.right = p;
923	–	}
924	–	if ((s.right = pr) != null)
925	–	pr.parent = s;
926	–	}
927	–	p.left = null;
928	–	if ((p.right = sr) != null)
929	–	sr.parent = p;
930	–	if ((s.left = pl) != null)
931	–	pl.parent = s;
932	–	if ((s.parent = pp) == null)
933	–	root = s;
934	–	else if (p == pp.left)
935	–	pp.left = s;
936	–	else
937	–	pp.right = s;
938	–	replacement = sr;
939	–	}
940	–	else
941	–	replacement = (pl != null) ? pl : pr;
942	–	TreeNode pp = p.parent;
943	–	if (replacement == null) {
944	–	if (pp == null) {
945	–	root = null;
946	–	return;
947	–	}
948	–	replacement = p;
949	–	}
950	–	else {
951	–	replacement.parent = pp;
952	–	if (pp == null)
953	–	root = replacement;
954	–	else if (p == pp.left)
955	–	pp.left = replacement;
956	–	else
957	–	pp.right = replacement;
958	–	p.left = p.right = p.parent = null;
959	–	}
960	–	if (!p.red) { // rebalance, from CLR
961	–	TreeNode x = replacement;
962	–	while (x != null) {
963	–	TreeNode xp, xpl;
964	–	if (x.red || (xp = x.parent) == null) {
965	–	x.red = false;
966	–	break;
967	–	}
968	–	if (x == (xpl = xp.left)) {
969	–	TreeNode sib = xp.right;
970	–	if (sib != null && sib.red) {
971	–	sib.red = false;
972	–	xp.red = true;
973	–	rotateLeft(xp);
974	–	sib = (xp = x.parent) == null ? null : xp.right;
975	–	}
976	–	if (sib == null)
977	–	x = xp;
978	–	else {
979	–	TreeNode sl = sib.left, sr = sib.right;
980	–	if ((sr == null || !sr.red) &&
981	–	(sl == null || !sl.red)) {
982	–	sib.red = true;
983	–	x = xp;
984	–	}
985	–	else {
986	–	if (sr == null || !sr.red) {
987	–	if (sl != null)
988	–	sl.red = false;
989	–	sib.red = true;
990	–	rotateRight(sib);
991	–	sib = (xp = x.parent) == null ? null : xp.right;
992	–	}
993	–	if (sib != null) {
994	–	sib.red = (xp == null) ? false : xp.red;
995	–	if ((sr = sib.right) != null)
996	–	sr.red = false;
997	–	}
998	–	if (xp != null) {
999	–	xp.red = false;
1000	–	rotateLeft(xp);
1001	–	}
1002	–	x = root;
1003	–	}
1004	–	}
1005	–	}
1006	–	else { // symmetric
1007	–	TreeNode sib = xpl;
1008	–	if (sib != null && sib.red) {
1009	–	sib.red = false;
1010	–	xp.red = true;
1011	–	rotateRight(xp);
1012	–	sib = (xp = x.parent) == null ? null : xp.left;
1013	–	}
1014	–	if (sib == null)
1015	–	x = xp;
1016	–	else {
1017	–	TreeNode sl = sib.left, sr = sib.right;
1018	–	if ((sl == null || !sl.red) &&
1019	–	(sr == null || !sr.red)) {
1020	–	sib.red = true;
1021	–	x = xp;
1022	–	}
1023	–	else {
1024	–	if (sl == null || !sl.red) {
1025	–	if (sr != null)
1026	–	sr.red = false;
1027	–	sib.red = true;
1028	–	rotateLeft(sib);
1029	–	sib = (xp = x.parent) == null ? null : xp.left;
1030	–	}
1031	–	if (sib != null) {
1032	–	sib.red = (xp == null) ? false : xp.red;
1033	–	if ((sl = sib.left) != null)
1034	–	sl.red = false;
1035	–	}
1036	–	if (xp != null) {
1037	–	xp.red = false;
1038	–	rotateRight(xp);
1039	–	}
1040	–	x = root;
1041	–	}
1042	–	}
1043	–	}
1044	–	}
1045	–	}
1046	–	if (p == replacement && (pp = p.parent) != null) {
1047	–	if (p == pp.left) // detach pointers
1048	–	pp.left = null;
1049	–	else if (p == pp.right)
1050	–	pp.right = null;
1051	–	p.parent = null;
1052	–	}
1053	–	}
641		}
642
643	<	/* ---------------- Collision reduction methods -------------- */
643	>	/* ---------------- Static utilities -------------- */
644
645		/**
646	<	* Spreads higher bits to lower, and also forces top 2 bits to 0.
647	<	* Because the table uses power-of-two masking, sets of hashes
648	<	* that vary only in bits above the current mask will always
649	<	* collide. (Among known examples are sets of Float keys holding
650	<	* consecutive whole numbers in small tables.)  To counter this,
651	<	* we apply a transform that spreads the impact of higher bits
646	>	* Spreads (XORs) higher bits of hash to lower and also forces top
647	>	* bit to 0. Because the table uses power-of-two masking, sets of
648	>	* hashes that vary only in bits above the current mask will
649	>	* always collide. (Among known examples are sets of Float keys
650	>	* holding consecutive whole numbers in small tables.)  So we
651	>	* apply a transform that spreads the impact of higher bits
652		* downward. There is a tradeoff between speed, utility, and
653		* quality of bit-spreading. Because many common sets of hashes
654	<	* are already reasonably distributed across bits (so don't benefit
655	<	* from spreading), and because we use trees to handle large sets
656	<	* of collisions in bins, we don't need excessively high quality.
654	>	* are already reasonably distributed (so don't benefit from
655	>	* spreading), and because we use trees to handle large sets of
656	>	* collisions in bins, we just XOR some shifted bits in the
657	>	* cheapest possible way to reduce systematic lossage, as well as
658	>	* to incorporate impact of the highest bits that would otherwise
659	>	* never be used in index calculations because of table bounds.
660		*/
661	<	private static final int spread(int h) {
662	<	h ^= (h >>> 18) ^ (h >>> 12);
1073	<	return (h ^ (h >>> 10)) & HASH_BITS;
1074	<	}
1075	<
1076	<	/**
1077	<	* Replaces a list bin with a tree bin. Call only when locked.
1078	<	* Fails to replace if the given key is non-comparable or table
1079	<	* is, or needs, resizing.
1080	<	*/
1081	<	private final void replaceWithTreeBin(Node[] tab, int index, Object key) {
1082	<	if ((key instanceof Comparable) &&
1083	<	(tab.length >= MAXIMUM_CAPACITY || counter.sum() < (long)sizeCtl)) {
1084	<	TreeBin t = new TreeBin();
1085	<	for (Node e = tabAt(tab, index); e != null; e = e.next)
1086	<	t.putTreeNode(e.hash & HASH_BITS, e.key, e.val);
1087	<	setTabAt(tab, index, new Node(MOVED, t, null, null));
1088	<	}
1089	<	}
1090	<
1091	<	/* ---------------- Internal access and update methods -------------- */
1092	<
1093	<	/** Implementation for get and containsKey */
1094	<	private final Object internalGet(Object k) {
1095	<	int h = spread(k.hashCode());
1096	<	retry: for (Node[] tab = table; tab != null;) {
1097	<	Node e, p; Object ek, ev; int eh;      // locals to read fields once
1098	<	for (e = tabAt(tab, (tab.length - 1) & h); e != null; e = e.next) {
1099	<	if ((eh = e.hash) == MOVED) {
1100	<	if ((ek = e.key) instanceof TreeBin)  // search TreeBin
1101	<	return ((TreeBin)ek).getValue(h, k);
1102	<	else {                        // restart with new table
1103	<	tab = (Node[])ek;
1104	<	continue retry;
1105	<	}
1106	<	}
1107	<	else if ((eh & HASH_BITS) == h && (ev = e.val) != null &&
1108	<	((ek = e.key) == k || k.equals(ek)))
1109	<	return ev;
1110	<	}
1111	<	break;
1112	<	}
1113	<	return null;
661	>	static final int spread(int h) {
662	>	return (h ^ (h >>> 16)) & HASH_BITS;
663		}
664
665		/**
1117	–	* Implementation for the four public remove/replace methods:
1118	–	* Replaces node value with v, conditional upon match of cv if
1119	–	* non-null.  If resulting value is null, delete.
1120	–	*/
1121	–	private final Object internalReplace(Object k, Object v, Object cv) {
1122	–	int h = spread(k.hashCode());
1123	–	Object oldVal = null;
1124	–	for (Node[] tab = table;;) {
1125	–	Node f; int i, fh; Object fk;
1126	–	if (tab == null ||
1127	–	(f = tabAt(tab, i = (tab.length - 1) & h)) == null)
1128	–	break;
1129	–	else if ((fh = f.hash) == MOVED) {
1130	–	if ((fk = f.key) instanceof TreeBin) {
1131	–	TreeBin t = (TreeBin)fk;
1132	–	boolean validated = false;
1133	–	boolean deleted = false;
1134	–	t.acquire(0);
1135	–	try {
1136	–	if (tabAt(tab, i) == f) {
1137	–	validated = true;
1138	–	TreeNode p = t.getTreeNode(h, k, t.root);
1139	–	if (p != null) {
1140	–	Object pv = p.val;
1141	–	if (cv == null || cv == pv || cv.equals(pv)) {
1142	–	oldVal = pv;
1143	–	if ((p.val = v) == null) {
1144	–	deleted = true;
1145	–	t.deleteTreeNode(p);
1146	–	}
1147	–	}
1148	–	}
1149	–	}
1150	–	} finally {
1151	–	t.release(0);
1152	–	}
1153	–	if (validated) {
1154	–	if (deleted)
1155	–	counter.add(-1L);
1156	–	break;
1157	–	}
1158	–	}
1159	–	else
1160	–	tab = (Node[])fk;
1161	–	}
1162	–	else if ((fh & HASH_BITS) != h && f.next == null) // precheck
1163	–	break;                          // rules out possible existence
1164	–	else if ((fh & LOCKED) != 0) {
1165	–	checkForResize();               // try resizing if can't get lock
1166	–	f.tryAwaitLock(tab, i);
1167	–	}
1168	–	else if (f.casHash(fh, fh | LOCKED)) {
1169	–	boolean validated = false;
1170	–	boolean deleted = false;
1171	–	try {
1172	–	if (tabAt(tab, i) == f) {
1173	–	validated = true;
1174	–	for (Node e = f, pred = null;;) {
1175	–	Object ek, ev;
1176	–	if ((e.hash & HASH_BITS) == h &&
1177	–	((ev = e.val) != null) &&
1178	–	((ek = e.key) == k || k.equals(ek))) {
1179	–	if (cv == null || cv == ev || cv.equals(ev)) {
1180	–	oldVal = ev;
1181	–	if ((e.val = v) == null) {
1182	–	deleted = true;
1183	–	Node en = e.next;
1184	–	if (pred != null)
1185	–	pred.next = en;
1186	–	else
1187	–	setTabAt(tab, i, en);
1188	–	}
1189	–	}
1190	–	break;
1191	–	}
1192	–	pred = e;
1193	–	if ((e = e.next) == null)
1194	–	break;
1195	–	}
1196	–	}
1197	–	} finally {
1198	–	if (!f.casHash(fh | LOCKED, fh)) {
1199	–	f.hash = fh;
1200	–	synchronized (f) { f.notifyAll(); };
1201	–	}
1202	–	}
1203	–	if (validated) {
1204	–	if (deleted)
1205	–	counter.add(-1L);
1206	–	break;
1207	–	}
1208	–	}
1209	–	}
1210	–	return oldVal;
1211	–	}
1212	–
1213	–	/*
1214	–	* Internal versions of the six insertion methods, each a
1215	–	* little more complicated than the last. All have
1216	–	* the same basic structure as the first (internalPut):
1217	–	*  1. If table uninitialized, create
1218	–	*  2. If bin empty, try to CAS new node
1219	–	*  3. If bin stale, use new table
1220	–	*  4. if bin converted to TreeBin, validate and relay to TreeBin methods
1221	–	*  5. Lock and validate; if valid, scan and add or update
1222	–	*
1223	–	* The others interweave other checks and/or alternative actions:
1224	–	*  * Plain put checks for and performs resize after insertion.
1225	–	*  * putIfAbsent prescans for mapping without lock (and fails to add
1226	–	*    if present), which also makes pre-emptive resize checks worthwhile.
1227	–	*  * computeIfAbsent extends form used in putIfAbsent with additional
1228	–	*    mechanics to deal with, calls, potential exceptions and null
1229	–	*    returns from function call.
1230	–	*  * compute uses the same function-call mechanics, but without
1231	–	*    the prescans
1232	–	*  * merge acts as putIfAbsent in the absent case, but invokes the
1233	–	*    update function if present
1234	–	*  * putAll attempts to pre-allocate enough table space
1235	–	*    and more lazily performs count updates and checks.
1236	–	*
1237	–	* Someday when details settle down a bit more, it might be worth
1238	–	* some factoring to reduce sprawl.
1239	–	*/
1240	–
1241	–	/** Implementation for put */
1242	–	private final Object internalPut(Object k, Object v) {
1243	–	int h = spread(k.hashCode());
1244	–	int count = 0;
1245	–	for (Node[] tab = table;;) {
1246	–	int i; Node f; int fh; Object fk;
1247	–	if (tab == null)
1248	–	tab = initTable();
1249	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1250	–	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1251	–	break;                   // no lock when adding to empty bin
1252	–	}
1253	–	else if ((fh = f.hash) == MOVED) {
1254	–	if ((fk = f.key) instanceof TreeBin) {
1255	–	TreeBin t = (TreeBin)fk;
1256	–	Object oldVal = null;
1257	–	t.acquire(0);
1258	–	try {
1259	–	if (tabAt(tab, i) == f) {
1260	–	count = 2;
1261	–	TreeNode p = t.putTreeNode(h, k, v);
1262	–	if (p != null) {
1263	–	oldVal = p.val;
1264	–	p.val = v;
1265	–	}
1266	–	}
1267	–	} finally {
1268	–	t.release(0);
1269	–	}
1270	–	if (count != 0) {
1271	–	if (oldVal != null)
1272	–	return oldVal;
1273	–	break;
1274	–	}
1275	–	}
1276	–	else
1277	–	tab = (Node[])fk;
1278	–	}
1279	–	else if ((fh & LOCKED) != 0) {
1280	–	checkForResize();
1281	–	f.tryAwaitLock(tab, i);
1282	–	}
1283	–	else if (f.casHash(fh, fh | LOCKED)) {
1284	–	Object oldVal = null;
1285	–	try {                        // needed in case equals() throws
1286	–	if (tabAt(tab, i) == f) {
1287	–	count = 1;
1288	–	for (Node e = f;; ++count) {
1289	–	Object ek, ev;
1290	–	if ((e.hash & HASH_BITS) == h &&
1291	–	(ev = e.val) != null &&
1292	–	((ek = e.key) == k || k.equals(ek))) {
1293	–	oldVal = ev;
1294	–	e.val = v;
1295	–	break;
1296	–	}
1297	–	Node last = e;
1298	–	if ((e = e.next) == null) {
1299	–	last.next = new Node(h, k, v, null);
1300	–	if (count >= TREE_THRESHOLD)
1301	–	replaceWithTreeBin(tab, i, k);
1302	–	break;
1303	–	}
1304	–	}
1305	–	}
1306	–	} finally {                  // unlock and signal if needed
1307	–	if (!f.casHash(fh | LOCKED, fh)) {
1308	–	f.hash = fh;
1309	–	synchronized (f) { f.notifyAll(); };
1310	–	}
1311	–	}
1312	–	if (count != 0) {
1313	–	if (oldVal != null)
1314	–	return oldVal;
1315	–	if (tab.length <= 64)
1316	–	count = 2;
1317	–	break;
1318	–	}
1319	–	}
1320	–	}
1321	–	counter.add(1L);
1322	–	if (count > 1)
1323	–	checkForResize();
1324	–	return null;
1325	–	}
1326	–
1327	–	/** Implementation for putIfAbsent */
1328	–	private final Object internalPutIfAbsent(Object k, Object v) {
1329	–	int h = spread(k.hashCode());
1330	–	int count = 0;
1331	–	for (Node[] tab = table;;) {
1332	–	int i; Node f; int fh; Object fk, fv;
1333	–	if (tab == null)
1334	–	tab = initTable();
1335	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1336	–	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1337	–	break;
1338	–	}
1339	–	else if ((fh = f.hash) == MOVED) {
1340	–	if ((fk = f.key) instanceof TreeBin) {
1341	–	TreeBin t = (TreeBin)fk;
1342	–	Object oldVal = null;
1343	–	t.acquire(0);
1344	–	try {
1345	–	if (tabAt(tab, i) == f) {
1346	–	count = 2;
1347	–	TreeNode p = t.putTreeNode(h, k, v);
1348	–	if (p != null)
1349	–	oldVal = p.val;
1350	–	}
1351	–	} finally {
1352	–	t.release(0);
1353	–	}
1354	–	if (count != 0) {
1355	–	if (oldVal != null)
1356	–	return oldVal;
1357	–	break;
1358	–	}
1359	–	}
1360	–	else
1361	–	tab = (Node[])fk;
1362	–	}
1363	–	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1364	–	((fk = f.key) == k || k.equals(fk)))
1365	–	return fv;
1366	–	else {
1367	–	Node g = f.next;
1368	–	if (g != null) { // at least 2 nodes -- search and maybe resize
1369	–	for (Node e = g;;) {
1370	–	Object ek, ev;
1371	–	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1372	–	((ek = e.key) == k || k.equals(ek)))
1373	–	return ev;
1374	–	if ((e = e.next) == null) {
1375	–	checkForResize();
1376	–	break;
1377	–	}
1378	–	}
1379	–	}
1380	–	if (((fh = f.hash) & LOCKED) != 0) {
1381	–	checkForResize();
1382	–	f.tryAwaitLock(tab, i);
1383	–	}
1384	–	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1385	–	Object oldVal = null;
1386	–	try {
1387	–	if (tabAt(tab, i) == f) {
1388	–	count = 1;
1389	–	for (Node e = f;; ++count) {
1390	–	Object ek, ev;
1391	–	if ((e.hash & HASH_BITS) == h &&
1392	–	(ev = e.val) != null &&
1393	–	((ek = e.key) == k || k.equals(ek))) {
1394	–	oldVal = ev;
1395	–	break;
1396	–	}
1397	–	Node last = e;
1398	–	if ((e = e.next) == null) {
1399	–	last.next = new Node(h, k, v, null);
1400	–	if (count >= TREE_THRESHOLD)
1401	–	replaceWithTreeBin(tab, i, k);
1402	–	break;
1403	–	}
1404	–	}
1405	–	}
1406	–	} finally {
1407	–	if (!f.casHash(fh | LOCKED, fh)) {
1408	–	f.hash = fh;
1409	–	synchronized (f) { f.notifyAll(); };
1410	–	}
1411	–	}
1412	–	if (count != 0) {
1413	–	if (oldVal != null)
1414	–	return oldVal;
1415	–	if (tab.length <= 64)
1416	–	count = 2;
1417	–	break;
1418	–	}
1419	–	}
1420	–	}
1421	–	}
1422	–	counter.add(1L);
1423	–	if (count > 1)
1424	–	checkForResize();
1425	–	return null;
1426	–	}
1427	–
1428	–	/** Implementation for computeIfAbsent */
1429	–	private final Object internalComputeIfAbsent(K k,
1430	–	Fun<? super K, ?> mf) {
1431	–	int h = spread(k.hashCode());
1432	–	Object val = null;
1433	–	int count = 0;
1434	–	for (Node[] tab = table;;) {
1435	–	Node f; int i, fh; Object fk, fv;
1436	–	if (tab == null)
1437	–	tab = initTable();
1438	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1439	–	Node node = new Node(fh = h | LOCKED, k, null, null);
1440	–	if (casTabAt(tab, i, null, node)) {
1441	–	count = 1;
1442	–	try {
1443	–	if ((val = mf.apply(k)) != null)
1444	–	node.val = val;
1445	–	} finally {
1446	–	if (val == null)
1447	–	setTabAt(tab, i, null);
1448	–	if (!node.casHash(fh, h)) {
1449	–	node.hash = h;
1450	–	synchronized (node) { node.notifyAll(); };
1451	–	}
1452	–	}
1453	–	}
1454	–	if (count != 0)
1455	–	break;
1456	–	}
1457	–	else if ((fh = f.hash) == MOVED) {
1458	–	if ((fk = f.key) instanceof TreeBin) {
1459	–	TreeBin t = (TreeBin)fk;
1460	–	boolean added = false;
1461	–	t.acquire(0);
1462	–	try {
1463	–	if (tabAt(tab, i) == f) {
1464	–	count = 1;
1465	–	TreeNode p = t.getTreeNode(h, k, t.root);
1466	–	if (p != null)
1467	–	val = p.val;
1468	–	else if ((val = mf.apply(k)) != null) {
1469	–	added = true;
1470	–	count = 2;
1471	–	t.putTreeNode(h, k, val);
1472	–	}
1473	–	}
1474	–	} finally {
1475	–	t.release(0);
1476	–	}
1477	–	if (count != 0) {
1478	–	if (!added)
1479	–	return val;
1480	–	break;
1481	–	}
1482	–	}
1483	–	else
1484	–	tab = (Node[])fk;
1485	–	}
1486	–	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1487	–	((fk = f.key) == k || k.equals(fk)))
1488	–	return fv;
1489	–	else {
1490	–	Node g = f.next;
1491	–	if (g != null) {
1492	–	for (Node e = g;;) {
1493	–	Object ek, ev;
1494	–	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1495	–	((ek = e.key) == k || k.equals(ek)))
1496	–	return ev;
1497	–	if ((e = e.next) == null) {
1498	–	checkForResize();
1499	–	break;
1500	–	}
1501	–	}
1502	–	}
1503	–	if (((fh = f.hash) & LOCKED) != 0) {
1504	–	checkForResize();
1505	–	f.tryAwaitLock(tab, i);
1506	–	}
1507	–	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1508	–	boolean added = false;
1509	–	try {
1510	–	if (tabAt(tab, i) == f) {
1511	–	count = 1;
1512	–	for (Node e = f;; ++count) {
1513	–	Object ek, ev;
1514	–	if ((e.hash & HASH_BITS) == h &&
1515	–	(ev = e.val) != null &&
1516	–	((ek = e.key) == k || k.equals(ek))) {
1517	–	val = ev;
1518	–	break;
1519	–	}
1520	–	Node last = e;
1521	–	if ((e = e.next) == null) {
1522	–	if ((val = mf.apply(k)) != null) {
1523	–	added = true;
1524	–	last.next = new Node(h, k, val, null);
1525	–	if (count >= TREE_THRESHOLD)
1526	–	replaceWithTreeBin(tab, i, k);
1527	–	}
1528	–	break;
1529	–	}
1530	–	}
1531	–	}
1532	–	} finally {
1533	–	if (!f.casHash(fh | LOCKED, fh)) {
1534	–	f.hash = fh;
1535	–	synchronized (f) { f.notifyAll(); };
1536	–	}
1537	–	}
1538	–	if (count != 0) {
1539	–	if (!added)
1540	–	return val;
1541	–	if (tab.length <= 64)
1542	–	count = 2;
1543	–	break;
1544	–	}
1545	–	}
1546	–	}
1547	–	}
1548	–	if (val != null) {
1549	–	counter.add(1L);
1550	–	if (count > 1)
1551	–	checkForResize();
1552	–	}
1553	–	return val;
1554	–	}
1555	–
1556	–	/** Implementation for compute */
1557	–	@SuppressWarnings("unchecked") private final Object internalCompute
1558	–	(K k, boolean onlyIfPresent, BiFun<? super K, ? super V, ? extends V> mf) {
1559	–	int h = spread(k.hashCode());
1560	–	Object val = null;
1561	–	int delta = 0;
1562	–	int count = 0;
1563	–	for (Node[] tab = table;;) {
1564	–	Node f; int i, fh; Object fk;
1565	–	if (tab == null)
1566	–	tab = initTable();
1567	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1568	–	if (onlyIfPresent)
1569	–	break;
1570	–	Node node = new Node(fh = h | LOCKED, k, null, null);
1571	–	if (casTabAt(tab, i, null, node)) {
1572	–	try {
1573	–	count = 1;
1574	–	if ((val = mf.apply(k, null)) != null) {
1575	–	node.val = val;
1576	–	delta = 1;
1577	–	}
1578	–	} finally {
1579	–	if (delta == 0)
1580	–	setTabAt(tab, i, null);
1581	–	if (!node.casHash(fh, h)) {
1582	–	node.hash = h;
1583	–	synchronized (node) { node.notifyAll(); };
1584	–	}
1585	–	}
1586	–	}
1587	–	if (count != 0)
1588	–	break;
1589	–	}
1590	–	else if ((fh = f.hash) == MOVED) {
1591	–	if ((fk = f.key) instanceof TreeBin) {
1592	–	TreeBin t = (TreeBin)fk;
1593	–	t.acquire(0);
1594	–	try {
1595	–	if (tabAt(tab, i) == f) {
1596	–	count = 1;
1597	–	TreeNode p = t.getTreeNode(h, k, t.root);
1598	–	Object pv = (p == null) ? null : p.val;
1599	–	if ((val = mf.apply(k, (V)pv)) != null) {
1600	–	if (p != null)
1601	–	p.val = val;
1602	–	else {
1603	–	count = 2;
1604	–	delta = 1;
1605	–	t.putTreeNode(h, k, val);
1606	–	}
1607	–	}
1608	–	else if (p != null) {
1609	–	delta = -1;
1610	–	t.deleteTreeNode(p);
1611	–	}
1612	–	}
1613	–	} finally {
1614	–	t.release(0);
1615	–	}
1616	–	if (count != 0)
1617	–	break;
1618	–	}
1619	–	else
1620	–	tab = (Node[])fk;
1621	–	}
1622	–	else if ((fh & LOCKED) != 0) {
1623	–	checkForResize();
1624	–	f.tryAwaitLock(tab, i);
1625	–	}
1626	–	else if (f.casHash(fh, fh | LOCKED)) {
1627	–	try {
1628	–	if (tabAt(tab, i) == f) {
1629	–	count = 1;
1630	–	for (Node e = f, pred = null;; ++count) {
1631	–	Object ek, ev;
1632	–	if ((e.hash & HASH_BITS) == h &&
1633	–	(ev = e.val) != null &&
1634	–	((ek = e.key) == k || k.equals(ek))) {
1635	–	val = mf.apply(k, (V)ev);
1636	–	if (val != null)
1637	–	e.val = val;
1638	–	else {
1639	–	delta = -1;
1640	–	Node en = e.next;
1641	–	if (pred != null)
1642	–	pred.next = en;
1643	–	else
1644	–	setTabAt(tab, i, en);
1645	–	}
1646	–	break;
1647	–	}
1648	–	pred = e;
1649	–	if ((e = e.next) == null) {
1650	–	if (!onlyIfPresent && (val = mf.apply(k, null)) != null) {
1651	–	pred.next = new Node(h, k, val, null);
1652	–	delta = 1;
1653	–	if (count >= TREE_THRESHOLD)
1654	–	replaceWithTreeBin(tab, i, k);
1655	–	}
1656	–	break;
1657	–	}
1658	–	}
1659	–	}
1660	–	} finally {
1661	–	if (!f.casHash(fh | LOCKED, fh)) {
1662	–	f.hash = fh;
1663	–	synchronized (f) { f.notifyAll(); };
1664	–	}
1665	–	}
1666	–	if (count != 0) {
1667	–	if (tab.length <= 64)
1668	–	count = 2;
1669	–	break;
1670	–	}
1671	–	}
1672	–	}
1673	–	if (delta != 0) {
1674	–	counter.add((long)delta);
1675	–	if (count > 1)
1676	–	checkForResize();
1677	–	}
1678	–	return val;
1679	–	}
1680	–
1681	–	/** Implementation for merge */
1682	–	@SuppressWarnings("unchecked") private final Object internalMerge
1683	–	(K k, V v, BiFun<? super V, ? super V, ? extends V> mf) {
1684	–	int h = spread(k.hashCode());
1685	–	Object val = null;
1686	–	int delta = 0;
1687	–	int count = 0;
1688	–	for (Node[] tab = table;;) {
1689	–	int i; Node f; int fh; Object fk, fv;
1690	–	if (tab == null)
1691	–	tab = initTable();
1692	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1693	–	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1694	–	delta = 1;
1695	–	val = v;
1696	–	break;
1697	–	}
1698	–	}
1699	–	else if ((fh = f.hash) == MOVED) {
1700	–	if ((fk = f.key) instanceof TreeBin) {
1701	–	TreeBin t = (TreeBin)fk;
1702	–	t.acquire(0);
1703	–	try {
1704	–	if (tabAt(tab, i) == f) {
1705	–	count = 1;
1706	–	TreeNode p = t.getTreeNode(h, k, t.root);
1707	–	val = (p == null) ? v : mf.apply((V)p.val, v);
1708	–	if (val != null) {
1709	–	if (p != null)
1710	–	p.val = val;
1711	–	else {
1712	–	count = 2;
1713	–	delta = 1;
1714	–	t.putTreeNode(h, k, val);
1715	–	}
1716	–	}
1717	–	else if (p != null) {
1718	–	delta = -1;
1719	–	t.deleteTreeNode(p);
1720	–	}
1721	–	}
1722	–	} finally {
1723	–	t.release(0);
1724	–	}
1725	–	if (count != 0)
1726	–	break;
1727	–	}
1728	–	else
1729	–	tab = (Node[])fk;
1730	–	}
1731	–	else if ((fh & LOCKED) != 0) {
1732	–	checkForResize();
1733	–	f.tryAwaitLock(tab, i);
1734	–	}
1735	–	else if (f.casHash(fh, fh | LOCKED)) {
1736	–	try {
1737	–	if (tabAt(tab, i) == f) {
1738	–	count = 1;
1739	–	for (Node e = f, pred = null;; ++count) {
1740	–	Object ek, ev;
1741	–	if ((e.hash & HASH_BITS) == h &&
1742	–	(ev = e.val) != null &&
1743	–	((ek = e.key) == k || k.equals(ek))) {
1744	–	val = mf.apply(v, (V)ev);
1745	–	if (val != null)
1746	–	e.val = val;
1747	–	else {
1748	–	delta = -1;
1749	–	Node en = e.next;
1750	–	if (pred != null)
1751	–	pred.next = en;
1752	–	else
1753	–	setTabAt(tab, i, en);
1754	–	}
1755	–	break;
1756	–	}
1757	–	pred = e;
1758	–	if ((e = e.next) == null) {
1759	–	val = v;
1760	–	pred.next = new Node(h, k, val, null);
1761	–	delta = 1;
1762	–	if (count >= TREE_THRESHOLD)
1763	–	replaceWithTreeBin(tab, i, k);
1764	–	break;
1765	–	}
1766	–	}
1767	–	}
1768	–	} finally {
1769	–	if (!f.casHash(fh | LOCKED, fh)) {
1770	–	f.hash = fh;
1771	–	synchronized (f) { f.notifyAll(); };
1772	–	}
1773	–	}
1774	–	if (count != 0) {
1775	–	if (tab.length <= 64)
1776	–	count = 2;
1777	–	break;
1778	–	}
1779	–	}
1780	–	}
1781	–	if (delta != 0) {
1782	–	counter.add((long)delta);
1783	–	if (count > 1)
1784	–	checkForResize();
1785	–	}
1786	–	return val;
1787	–	}
1788	–
1789	–	/** Implementation for putAll */
1790	–	private final void internalPutAll(Map<?, ?> m) {
1791	–	tryPresize(m.size());
1792	–	long delta = 0L;     // number of uncommitted additions
1793	–	boolean npe = false; // to throw exception on exit for nulls
1794	–	try {                // to clean up counts on other exceptions
1795	–	for (Map.Entry<?, ?> entry : m.entrySet()) {
1796	–	Object k, v;
1797	–	if (entry == null || (k = entry.getKey()) == null ||
1798	–	(v = entry.getValue()) == null) {
1799	–	npe = true;
1800	–	break;
1801	–	}
1802	–	int h = spread(k.hashCode());
1803	–	for (Node[] tab = table;;) {
1804	–	int i; Node f; int fh; Object fk;
1805	–	if (tab == null)
1806	–	tab = initTable();
1807	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null){
1808	–	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1809	–	++delta;
1810	–	break;
1811	–	}
1812	–	}
1813	–	else if ((fh = f.hash) == MOVED) {
1814	–	if ((fk = f.key) instanceof TreeBin) {
1815	–	TreeBin t = (TreeBin)fk;
1816	–	boolean validated = false;
1817	–	t.acquire(0);
1818	–	try {
1819	–	if (tabAt(tab, i) == f) {
1820	–	validated = true;
1821	–	TreeNode p = t.getTreeNode(h, k, t.root);
1822	–	if (p != null)
1823	–	p.val = v;
1824	–	else {
1825	–	t.putTreeNode(h, k, v);
1826	–	++delta;
1827	–	}
1828	–	}
1829	–	} finally {
1830	–	t.release(0);
1831	–	}
1832	–	if (validated)
1833	–	break;
1834	–	}
1835	–	else
1836	–	tab = (Node[])fk;
1837	–	}
1838	–	else if ((fh & LOCKED) != 0) {
1839	–	counter.add(delta);
1840	–	delta = 0L;
1841	–	checkForResize();
1842	–	f.tryAwaitLock(tab, i);
1843	–	}
1844	–	else if (f.casHash(fh, fh | LOCKED)) {
1845	–	int count = 0;
1846	–	try {
1847	–	if (tabAt(tab, i) == f) {
1848	–	count = 1;
1849	–	for (Node e = f;; ++count) {
1850	–	Object ek, ev;
1851	–	if ((e.hash & HASH_BITS) == h &&
1852	–	(ev = e.val) != null &&
1853	–	((ek = e.key) == k || k.equals(ek))) {
1854	–	e.val = v;
1855	–	break;
1856	–	}
1857	–	Node last = e;
1858	–	if ((e = e.next) == null) {
1859	–	++delta;
1860	–	last.next = new Node(h, k, v, null);
1861	–	if (count >= TREE_THRESHOLD)
1862	–	replaceWithTreeBin(tab, i, k);
1863	–	break;
1864	–	}
1865	–	}
1866	–	}
1867	–	} finally {
1868	–	if (!f.casHash(fh | LOCKED, fh)) {
1869	–	f.hash = fh;
1870	–	synchronized (f) { f.notifyAll(); };
1871	–	}
1872	–	}
1873	–	if (count != 0) {
1874	–	if (count > 1) {
1875	–	counter.add(delta);
1876	–	delta = 0L;
1877	–	checkForResize();
1878	–	}
1879	–	break;
1880	–	}
1881	–	}
1882	–	}
1883	–	}
1884	–	} finally {
1885	–	if (delta != 0)
1886	–	counter.add(delta);
1887	–	}
1888	–	if (npe)
1889	–	throw new NullPointerException();
1890	–	}
1891	–
1892	–	/* ---------------- Table Initialization and Resizing -------------- */
1893	–
1894	–	/**
666		* Returns a power of two table size for the given desired capacity.
667		* See Hackers Delight, sec 3.2
668		*/
#	Line 1906 | Line 677 | public class ConcurrentHashMapV8<K, V>
677		}
678
679		/**
680	<	* Initializes table, using the size recorded in sizeCtl.
680	>	* Returns x's Class if it is of the form "class C implements
681	>	* Comparable<C>", else null.
682		*/
683	<	private final Node[] initTable() {
684	<	Node[] tab; int sc;
685	<	while ((tab = table) == null) {
686	<	if ((sc = sizeCtl) < 0)
687	<	Thread.yield(); // lost initialization race; just spin
688	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
689	<	try {
690	<	if ((tab = table) == null) {
691	<	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
692	<	tab = table = new Node[n];
693	<	sc = n - (n >>> 2);
694	<	}
695	<	} finally {
1924	<	sizeCtl = sc;
1925	<	}
1926	<	break;
1927	<	}
1928	<	}
1929	<	return tab;
1930	<	}
1931	<
1932	<	/**
1933	<	* If table is too small and not already resizing, creates next
1934	<	* table and transfers bins.  Rechecks occupancy after a transfer
1935	<	* to see if another resize is already needed because resizings
1936	<	* are lagging additions.
1937	<	*/
1938	<	private final void checkForResize() {
1939	<	Node[] tab; int n, sc;
1940	<	while ((tab = table) != null &&
1941	<	(n = tab.length) < MAXIMUM_CAPACITY &&
1942	<	(sc = sizeCtl) >= 0 && counter.sum() >= (long)sc &&
1943	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1944	<	try {
1945	<	if (tab == table) {
1946	<	table = rebuild(tab);
1947	<	sc = (n << 1) - (n >>> 1);
683	>	static Class<?> comparableClassFor(Object x) {
684	>	if (x instanceof Comparable) {
685	>	Class<?> c; Type[] ts, as; Type t; ParameterizedType p;
686	>	if ((c = x.getClass()) == String.class) // bypass checks
687	>	return c;
688	>	if ((ts = c.getGenericInterfaces()) != null) {
689	>	for (int i = 0; i < ts.length; ++i) {
690	>	if (((t = ts[i]) instanceof ParameterizedType) &&
691	>	((p = (ParameterizedType)t).getRawType() ==
692	>	Comparable.class) &&
693	>	(as = p.getActualTypeArguments()) != null &&
694	>	as.length == 1 && as[0] == c) // type arg is c
695	>	return c;
696		}
1949	–	} finally {
1950	–	sizeCtl = sc;
697		}
698		}
699	+	return null;
700		}
701
702		/**
703	<	* Tries to presize table to accommodate the given number of elements.
704	<	*
1958	<	* @param size number of elements (doesn't need to be perfectly accurate)
703	>	* Returns k.compareTo(x) if x matches kc (k's screened comparable
704	>	* class), else 0.
705		*/
706	<	private final void tryPresize(int size) {
707	<	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
708	<	tableSizeFor(size + (size >>> 1) + 1);
709	<	int sc;
1964	<	while ((sc = sizeCtl) >= 0) {
1965	<	Node[] tab = table; int n;
1966	<	if (tab == null || (n = tab.length) == 0) {
1967	<	n = (sc > c) ? sc : c;
1968	<	if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1969	<	try {
1970	<	if (table == tab) {
1971	<	table = new Node[n];
1972	<	sc = n - (n >>> 2);
1973	<	}
1974	<	} finally {
1975	<	sizeCtl = sc;
1976	<	}
1977	<	}
1978	<	}
1979	<	else if (c <= sc || n >= MAXIMUM_CAPACITY)
1980	<	break;
1981	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1982	<	try {
1983	<	if (table == tab) {
1984	<	table = rebuild(tab);
1985	<	sc = (n << 1) - (n >>> 1);
1986	<	}
1987	<	} finally {
1988	<	sizeCtl = sc;
1989	<	}
1990	<	}
1991	<	}
706	>	@SuppressWarnings({"rawtypes","unchecked"}) // for cast to Comparable
707	>	static int compareComparables(Class<?> kc, Object k, Object x) {
708	>	return (x == null || x.getClass() != kc ? 0 :
709	>	((Comparable)k).compareTo(x));
710		}
711
712	+	/* ---------------- Table element access -------------- */
713	+
714		/*
715	<	* Moves and/or copies the nodes in each bin to new table. See
716	<	* above for explanation.
717	<	*
718	<	* @return the new table
719	<	*/
720	<	private static final Node[] rebuild(Node[] tab) {
721	<	int n = tab.length;
722	<	Node[] nextTab = new Node[n << 1];
723	<	Node fwd = new Node(MOVED, nextTab, null, null);
724	<	int[] buffer = null;       // holds bins to revisit; null until needed
725	<	Node rev = null;           // reverse forwarder; null until needed
726	<	int nbuffered = 0;         // the number of bins in buffer list
727	<	int bufferIndex = 0;       // buffer index of current buffered bin
728	<	int bin = n - 1;           // current non-buffered bin or -1 if none
729	<
730	<	for (int i = bin;;) {      // start upwards sweep
731	<	int fh; Node f;
732	<	if ((f = tabAt(tab, i)) == null) {
733	<	if (bin >= 0) {    // Unbuffered; no lock needed (or available)
734	<	if (!casTabAt(tab, i, f, fwd))
735	<	continue;
736	<	}
2017	<	else {             // transiently use a locked forwarding node
2018	<	Node g = new Node(MOVED|LOCKED, nextTab, null, null);
2019	<	if (!casTabAt(tab, i, f, g))
2020	<	continue;
2021	<	setTabAt(nextTab, i, null);
2022	<	setTabAt(nextTab, i + n, null);
2023	<	setTabAt(tab, i, fwd);
2024	<	if (!g.casHash(MOVED|LOCKED, MOVED)) {
2025	<	g.hash = MOVED;
2026	<	synchronized (g) { g.notifyAll(); }
2027	<	}
2028	<	}
2029	<	}
2030	<	else if ((fh = f.hash) == MOVED) {
2031	<	Object fk = f.key;
2032	<	if (fk instanceof TreeBin) {
2033	<	TreeBin t = (TreeBin)fk;
2034	<	boolean validated = false;
2035	<	t.acquire(0);
2036	<	try {
2037	<	if (tabAt(tab, i) == f) {
2038	<	validated = true;
2039	<	splitTreeBin(nextTab, i, t);
2040	<	setTabAt(tab, i, fwd);
2041	<	}
2042	<	} finally {
2043	<	t.release(0);
2044	<	}
2045	<	if (!validated)
2046	<	continue;
2047	<	}
2048	<	}
2049	<	else if ((fh & LOCKED) == 0 && f.casHash(fh, fh|LOCKED)) {
2050	<	boolean validated = false;
2051	<	try {              // split to lo and hi lists; copying as needed
2052	<	if (tabAt(tab, i) == f) {
2053	<	validated = true;
2054	<	splitBin(nextTab, i, f);
2055	<	setTabAt(tab, i, fwd);
2056	<	}
2057	<	} finally {
2058	<	if (!f.casHash(fh | LOCKED, fh)) {
2059	<	f.hash = fh;
2060	<	synchronized (f) { f.notifyAll(); };
2061	<	}
2062	<	}
2063	<	if (!validated)
2064	<	continue;
2065	<	}
2066	<	else {
2067	<	if (buffer == null) // initialize buffer for revisits
2068	<	buffer = new int[TRANSFER_BUFFER_SIZE];
2069	<	if (bin < 0 && bufferIndex > 0) {
2070	<	int j = buffer[--bufferIndex];
2071	<	buffer[bufferIndex] = i;
2072	<	i = j;         // swap with another bin
2073	<	continue;
2074	<	}
2075	<	if (bin < 0 || nbuffered >= TRANSFER_BUFFER_SIZE) {
2076	<	f.tryAwaitLock(tab, i);
2077	<	continue;      // no other options -- block
2078	<	}
2079	<	if (rev == null)   // initialize reverse-forwarder
2080	<	rev = new Node(MOVED, tab, null, null);
2081	<	if (tabAt(tab, i) != f || (f.hash & LOCKED) == 0)
2082	<	continue;      // recheck before adding to list
2083	<	buffer[nbuffered++] = i;
2084	<	setTabAt(nextTab, i, rev);     // install place-holders
2085	<	setTabAt(nextTab, i + n, rev);
2086	<	}
2087	<
2088	<	if (bin > 0)
2089	<	i = --bin;
2090	<	else if (buffer != null && nbuffered > 0) {
2091	<	bin = -1;
2092	<	i = buffer[bufferIndex = --nbuffered];
2093	<	}
2094	<	else
2095	<	return nextTab;
2096	<	}
715	>	* Volatile access methods are used for table elements as well as
716	>	* elements of in-progress next table while resizing.  All uses of
717	>	* the tab arguments must be null checked by callers.  All callers
718	>	* also paranoically precheck that tab's length is not zero (or an
719	>	* equivalent check), thus ensuring that any index argument taking
720	>	* the form of a hash value anded with (length - 1) is a valid
721	>	* index.  Note that, to be correct wrt arbitrary concurrency
722	>	* errors by users, these checks must operate on local variables,
723	>	* which accounts for some odd-looking inline assignments below.
724	>	* Note that calls to setTabAt always occur within locked regions,
725	>	* and so do not need full volatile semantics, but still require
726	>	* ordering to maintain concurrent readability.
727	>	*/
728	>
729	>	@SuppressWarnings("unchecked")
730	>	static final <K,V> Node<K,V> tabAt(Node<K,V>[] tab, int i) {
731	>	return (Node<K,V>)U.getObjectVolatile(tab, ((long)i << ASHIFT) + ABASE);
732	>	}
733	>
734	>	static final <K,V> boolean casTabAt(Node<K,V>[] tab, int i,
735	>	Node<K,V> c, Node<K,V> v) {
736	>	return U.compareAndSwapObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
737		}
738
739	<	/**
740	<	* Splits a normal bin with list headed by e into lo and hi parts;
2101	<	* installs in given table.
2102	<	*/
2103	<	private static void splitBin(Node[] nextTab, int i, Node e) {
2104	<	int bit = nextTab.length >>> 1; // bit to split on
2105	<	int runBit = e.hash & bit;
2106	<	Node lastRun = e, lo = null, hi = null;
2107	<	for (Node p = e.next; p != null; p = p.next) {
2108	<	int b = p.hash & bit;
2109	<	if (b != runBit) {
2110	<	runBit = b;
2111	<	lastRun = p;
2112	<	}
2113	<	}
2114	<	if (runBit == 0)
2115	<	lo = lastRun;
2116	<	else
2117	<	hi = lastRun;
2118	<	for (Node p = e; p != lastRun; p = p.next) {
2119	<	int ph = p.hash & HASH_BITS;
2120	<	Object pk = p.key, pv = p.val;
2121	<	if ((ph & bit) == 0)
2122	<	lo = new Node(ph, pk, pv, lo);
2123	<	else
2124	<	hi = new Node(ph, pk, pv, hi);
2125	<	}
2126	<	setTabAt(nextTab, i, lo);
2127	<	setTabAt(nextTab, i + bit, hi);
739	>	static final <K,V> void setTabAt(Node<K,V>[] tab, int i, Node<K,V> v) {
740	>	U.putOrderedObject(tab, ((long)i << ASHIFT) + ABASE, v);
741		}
742
743	+	/* ---------------- Fields -------------- */
744	+
745		/**
746	<	* Splits a tree bin into lo and hi parts; installs in given table.
746	>	* The array of bins. Lazily initialized upon first insertion.
747	>	* Size is always a power of two. Accessed directly by iterators.
748		*/
749	<	private static void splitTreeBin(Node[] nextTab, int i, TreeBin t) {
2134	<	int bit = nextTab.length >>> 1;
2135	<	TreeBin lt = new TreeBin();
2136	<	TreeBin ht = new TreeBin();
2137	<	int lc = 0, hc = 0;
2138	<	for (Node e = t.first; e != null; e = e.next) {
2139	<	int h = e.hash & HASH_BITS;
2140	<	Object k = e.key, v = e.val;
2141	<	if ((h & bit) == 0) {
2142	<	++lc;
2143	<	lt.putTreeNode(h, k, v);
2144	<	}
2145	<	else {
2146	<	++hc;
2147	<	ht.putTreeNode(h, k, v);
2148	<	}
2149	<	}
2150	<	Node ln, hn; // throw away trees if too small
2151	<	if (lc <= (TREE_THRESHOLD >>> 1)) {
2152	<	ln = null;
2153	<	for (Node p = lt.first; p != null; p = p.next)
2154	<	ln = new Node(p.hash, p.key, p.val, ln);
2155	<	}
2156	<	else
2157	<	ln = new Node(MOVED, lt, null, null);
2158	<	setTabAt(nextTab, i, ln);
2159	<	if (hc <= (TREE_THRESHOLD >>> 1)) {
2160	<	hn = null;
2161	<	for (Node p = ht.first; p != null; p = p.next)
2162	<	hn = new Node(p.hash, p.key, p.val, hn);
2163	<	}
2164	<	else
2165	<	hn = new Node(MOVED, ht, null, null);
2166	<	setTabAt(nextTab, i + bit, hn);
2167	<	}
749	>	transient volatile Node<K,V>[] table;
750
751		/**
752	<	* Implementation for clear. Steps through each bin, removing all
2171	<	* nodes.
752	>	* The next table to use; non-null only while resizing.
753		*/
754	<	private final void internalClear() {
2174	<	long delta = 0L; // negative number of deletions
2175	<	int i = 0;
2176	<	Node[] tab = table;
2177	<	while (tab != null && i < tab.length) {
2178	<	int fh; Object fk;
2179	<	Node f = tabAt(tab, i);
2180	<	if (f == null)
2181	<	++i;
2182	<	else if ((fh = f.hash) == MOVED) {
2183	<	if ((fk = f.key) instanceof TreeBin) {
2184	<	TreeBin t = (TreeBin)fk;
2185	<	t.acquire(0);
2186	<	try {
2187	<	if (tabAt(tab, i) == f) {
2188	<	for (Node p = t.first; p != null; p = p.next) {
2189	<	if (p.val != null) { // (currently always true)
2190	<	p.val = null;
2191	<	--delta;
2192	<	}
2193	<	}
2194	<	t.first = null;
2195	<	t.root = null;
2196	<	++i;
2197	<	}
2198	<	} finally {
2199	<	t.release(0);
2200	<	}
2201	<	}
2202	<	else
2203	<	tab = (Node[])fk;
2204	<	}
2205	<	else if ((fh & LOCKED) != 0) {
2206	<	counter.add(delta); // opportunistically update count
2207	<	delta = 0L;
2208	<	f.tryAwaitLock(tab, i);
2209	<	}
2210	<	else if (f.casHash(fh, fh | LOCKED)) {
2211	<	try {
2212	<	if (tabAt(tab, i) == f) {
2213	<	for (Node e = f; e != null; e = e.next) {
2214	<	if (e.val != null) {  // (currently always true)
2215	<	e.val = null;
2216	<	--delta;
2217	<	}
2218	<	}
2219	<	setTabAt(tab, i, null);
2220	<	++i;
2221	<	}
2222	<	} finally {
2223	<	if (!f.casHash(fh | LOCKED, fh)) {
2224	<	f.hash = fh;
2225	<	synchronized (f) { f.notifyAll(); };
2226	<	}
2227	<	}
2228	<	}
2229	<	}
2230	<	if (delta != 0)
2231	<	counter.add(delta);
2232	<	}
754	>	private transient volatile Node<K,V>[] nextTable;
755
756	<	/* ----------------Table Traversal -------------- */
756	>	/**
757	>	* Base counter value, used mainly when there is no contention,
758	>	* but also as a fallback during table initialization
759	>	* races. Updated via CAS.
760	>	*/
761	>	private transient volatile long baseCount;
762
763		/**
764	<	* Encapsulates traversal for methods such as containsValue; also
765	<	* serves as a base class for other iterators and bulk tasks.
766	<	*
767	<	* At each step, the iterator snapshots the key ("nextKey") and
768	<	* value ("nextVal") of a valid node (i.e., one that, at point of
769	<	* snapshot, has a non-null user value). Because val fields can
770	<	* change (including to null, indicating deletion), field nextVal
771	<	* might not be accurate at point of use, but still maintains the
2245	<	* weak consistency property of holding a value that was once
2246	<	* valid.
2247	<	*
2248	<	* Internal traversals directly access these fields, as in:
2249	<	* {@code while (it.advance() != null) { process(it.nextKey); }}
2250	<	*
2251	<	* Exported iterators must track whether the iterator has advanced
2252	<	* (in hasNext vs next) (by setting/checking/nulling field
2253	<	* nextVal), and then extract key, value, or key-value pairs as
2254	<	* return values of next().
2255	<	*
2256	<	* The iterator visits once each still-valid node that was
2257	<	* reachable upon iterator construction. It might miss some that
2258	<	* were added to a bin after the bin was visited, which is OK wrt
2259	<	* consistency guarantees. Maintaining this property in the face
2260	<	* of possible ongoing resizes requires a fair amount of
2261	<	* bookkeeping state that is difficult to optimize away amidst
2262	<	* volatile accesses.  Even so, traversal maintains reasonable
2263	<	* throughput.
2264	<	*
2265	<	* Normally, iteration proceeds bin-by-bin traversing lists.
2266	<	* However, if the table has been resized, then all future steps
2267	<	* must traverse both the bin at the current index as well as at
2268	<	* (index + baseSize); and so on for further resizings. To
2269	<	* paranoically cope with potential sharing by users of iterators
2270	<	* across threads, iteration terminates if a bounds checks fails
2271	<	* for a table read.
2272	<	*
2273	<	* This class extends ForkJoinTask to streamline parallel
2274	<	* iteration in bulk operations (see BulkTask). This adds only an
2275	<	* int of space overhead, which is close enough to negligible in
2276	<	* cases where it is not needed to not worry about it.  Because
2277	<	* ForkJoinTask is Serializable, but iterators need not be, we
2278	<	* need to add warning suppressions.
2279	<	*/
2280	<	@SuppressWarnings("serial") static class Traverser<K,V,R> extends ForkJoinTask<R> {
2281	<	final ConcurrentHashMapV8<K, V> map;
2282	<	Node next;           // the next entry to use
2283	<	Node last;           // the last entry used
2284	<	Object nextKey;      // cached key field of next
2285	<	Object nextVal;      // cached val field of next
2286	<	Node[] tab;          // current table; updated if resized
2287	<	int index;           // index of bin to use next
2288	<	int baseIndex;       // current index of initial table
2289	<	int baseLimit;       // index bound for initial table
2290	<	int baseSize;        // initial table size
764	>	* Table initialization and resizing control.  When negative, the
765	>	* table is being initialized or resized: -1 for initialization,
766	>	* else -(1 + the number of active resizing threads).  Otherwise,
767	>	* when table is null, holds the initial table size to use upon
768	>	* creation, or 0 for default. After initialization, holds the
769	>	* next element count value upon which to resize the table.
770	>	*/
771	>	private transient volatile int sizeCtl;
772
773	<	/** Creates iterator for all entries in the table. */
774	<	Traverser(ConcurrentHashMapV8<K, V> map) {
775	<	this.map = map;
776	<	}
773	>	/**
774	>	* The next table index (plus one) to split while resizing.
775	>	*/
776	>	private transient volatile int transferIndex;
777
778	<	/** Creates iterator for split() methods */
779	<	Traverser(Traverser<K,V,?> it) {
780	<	ConcurrentHashMapV8<K, V> m; Node[] t;
781	<	if ((m = this.map = it.map) == null)
2301	<	t = null;
2302	<	else if ((t = it.tab) == null && // force parent tab initialization
2303	<	(t = it.tab = m.table) != null)
2304	<	it.baseLimit = it.baseSize = t.length;
2305	<	this.tab = t;
2306	<	this.baseSize = it.baseSize;
2307	<	it.baseLimit = this.index = this.baseIndex =
2308	<	((this.baseLimit = it.baseLimit) + it.baseIndex + 1) >>> 1;
2309	<	}
778	>	/**
779	>	* The least available table index to split while resizing.
780	>	*/
781	>	private transient volatile int transferOrigin;
782
783	<	/**
784	<	* Advances next; returns nextVal or null if terminated.
785	<	* See above for explanation.
786	<	*/
2315	<	final Object advance() {
2316	<	Node e = last = next;
2317	<	Object ev = null;
2318	<	outer: do {
2319	<	if (e != null)                  // advance past used/skipped node
2320	<	e = e.next;
2321	<	while (e == null) {             // get to next non-null bin
2322	<	ConcurrentHashMapV8<K, V> m;
2323	<	Node[] t; int b, i, n; Object ek; // checks must use locals
2324	<	if ((t = tab) != null)
2325	<	n = t.length;
2326	<	else if ((m = map) != null && (t = tab = m.table) != null)
2327	<	n = baseLimit = baseSize = t.length;
2328	<	else
2329	<	break outer;
2330	<	if ((b = baseIndex) >= baseLimit ||
2331	<	(i = index) < 0 || i >= n)
2332	<	break outer;
2333	<	if ((e = tabAt(t, i)) != null && e.hash == MOVED) {
2334	<	if ((ek = e.key) instanceof TreeBin)
2335	<	e = ((TreeBin)ek).first;
2336	<	else {
2337	<	tab = (Node[])ek;
2338	<	continue;           // restarts due to null val
2339	<	}
2340	<	}                           // visit upper slots if present
2341	<	index = (i += baseSize) < n ? i : (baseIndex = b + 1);
2342	<	}
2343	<	nextKey = e.key;
2344	<	} while ((ev = e.val) == null);    // skip deleted or special nodes
2345	<	next = e;
2346	<	return nextVal = ev;
2347	<	}
783	>	/**
784	>	* Spinlock (locked via CAS) used when resizing and/or creating CounterCells.
785	>	*/
786	>	private transient volatile int cellsBusy;
787
788	<	public final void remove() {
789	<	if (nextVal == null && last == null)
790	<	advance();
791	<	Node e = last;
2353	<	if (e == null)
2354	<	throw new IllegalStateException();
2355	<	last = null;
2356	<	map.remove(e.key);
2357	<	}
788	>	/**
789	>	* Table of counter cells. When non-null, size is a power of 2.
790	>	*/
791	>	private transient volatile CounterCell[] counterCells;
792
793	<	public final boolean hasNext() {
794	<	return nextVal != null || advance() != null;
795	<	}
793	>	// views
794	>	private transient KeySetView<K,V> keySet;
795	>	private transient ValuesView<K,V> values;
796	>	private transient EntrySetView<K,V> entrySet;
797
2363	–	public final boolean hasMoreElements() { return hasNext(); }
2364	–	public final void setRawResult(Object x) { }
2365	–	public R getRawResult() { return null; }
2366	–	public boolean exec() { return true; }
2367	–	}
798
799		/* ---------------- Public operations -------------- */
800
#	Line 2372 | Line 802 | public class ConcurrentHashMapV8<K, V>
802		* Creates a new, empty map with the default initial table size (16).
803		*/
804		public ConcurrentHashMapV8() {
2375	–	this.counter = new LongAdder();
805		}
806
807		/**
#	Line 2391 | Line 820 | public class ConcurrentHashMapV8<K, V>
820		int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
821		MAXIMUM_CAPACITY :
822		tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2394	–	this.counter = new LongAdder();
823		this.sizeCtl = cap;
824		}
825
#	Line 2401 | Line 829 | public class ConcurrentHashMapV8<K, V>
829		* @param m the map
830		*/
831		public ConcurrentHashMapV8(Map<? extends K, ? extends V> m) {
2404	–	this.counter = new LongAdder();
832		this.sizeCtl = DEFAULT_CAPACITY;
833	<	internalPutAll(m);
833	>	putAll(m);
834		}
835
836		/**
#	Line 2444 | Line 871 | public class ConcurrentHashMapV8<K, V>
871		* nonpositive
872		*/
873		public ConcurrentHashMapV8(int initialCapacity,
874	<	float loadFactor, int concurrencyLevel) {
874	>	float loadFactor, int concurrencyLevel) {
875		if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
876		throw new IllegalArgumentException();
877		if (initialCapacity < concurrencyLevel)   // Use at least as many bins
#	Line 2452 | Line 879 | public class ConcurrentHashMapV8<K, V>
879		long size = (long)(1.0 + (long)initialCapacity / loadFactor);
880		int cap = (size >= (long)MAXIMUM_CAPACITY) ?
881		MAXIMUM_CAPACITY : tableSizeFor((int)size);
2455	–	this.counter = new LongAdder();
882		this.sizeCtl = cap;
883		}
884
885	<	/**
2460	<	* {@inheritDoc}
2461	<	*/
2462	<	public boolean isEmpty() {
2463	<	return counter.sum() <= 0L; // ignore transient negative values
2464	<	}
885	>	// Original (since JDK1.2) Map methods
886
887		/**
888		* {@inheritDoc}
889		*/
890		public int size() {
891	<	long n = counter.sum();
891	>	long n = sumCount();
892		return ((n < 0L) ? 0 :
893		(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
894		(int)n);
895		}
896
897		/**
898	<	* Returns the number of mappings. This method should be used
2478	<	* instead of {@link #size} because a ConcurrentHashMap may
2479	<	* contain more mappings than can be represented as an int. The
2480	<	* value returned is a snapshot; the actual count may differ if
2481	<	* there are ongoing concurrent insertions or removals.
2482	<	*
2483	<	* @return the number of mappings
898	>	* {@inheritDoc}
899		*/
900	<	public long mappingCount() {
901	<	long n = counter.sum();
2487	<	return (n < 0L) ? 0L : n; // ignore transient negative values
900	>	public boolean isEmpty() {
901	>	return sumCount() <= 0L; // ignore transient negative values
902		}
903
904		/**
#	Line 2498 | Line 912 | public class ConcurrentHashMapV8<K, V>
912		*
913		* @throws NullPointerException if the specified key is null
914		*/
915	<	@SuppressWarnings("unchecked") public V get(Object key) {
916	<	if (key == null)
917	<	throw new NullPointerException();
918	<	return (V)internalGet(key);
919	<	}
920	<
921	<	/**
922	<	* Returns the value to which the specified key is mapped,
923	<	* or the given defaultValue if this map contains no mapping for the key.
924	<	*
925	<	* @param key the key
926	<	* @param defaultValue the value to return if this map contains
927	<	* no mapping for the given key
928	<	* @return the mapping for the key, if present; else the defaultValue
929	<	* @throws NullPointerException if the specified key is null
930	<	*/
931	<	@SuppressWarnings("unchecked") public V getValueOrDefault(Object key, V defaultValue) {
932	<	if (key == null)
2519	<	throw new NullPointerException();
2520	<	V v = (V) internalGet(key);
2521	<	return v == null ? defaultValue : v;
915	>	public V get(Object key) {
916	>	Node<K,V>[] tab; Node<K,V> e, p; int n, eh; K ek;
917	>	int h = spread(key.hashCode());
918	>	if ((tab = table) != null && (n = tab.length) > 0 &&
919	>	(e = tabAt(tab, (n - 1) & h)) != null) {
920	>	if ((eh = e.hash) == h) {
921	>	if ((ek = e.key) == key || (ek != null && key.equals(ek)))
922	>	return e.val;
923	>	}
924	>	else if (eh < 0)
925	>	return (p = e.find(h, key)) != null ? p.val : null;
926	>	while ((e = e.next) != null) {
927	>	if (e.hash == h &&
928	>	((ek = e.key) == key || (ek != null && key.equals(ek))))
929	>	return e.val;
930	>	}
931	>	}
932	>	return null;
933		}
934
935		/**
936		* Tests if the specified object is a key in this table.
937		*
938	<	* @param  key   possible key
938	>	* @param  key possible key
939		* @return {@code true} if and only if the specified object
940		*         is a key in this table, as determined by the
941		*         {@code equals} method; {@code false} otherwise
942		* @throws NullPointerException if the specified key is null
943		*/
944		public boolean containsKey(Object key) {
945	<	if (key == null)
2535	<	throw new NullPointerException();
2536	<	return internalGet(key) != null;
945	>	return get(key) != null;
946		}
947
948		/**
#	Line 2549 | Line 958 | public class ConcurrentHashMapV8<K, V>
958		public boolean containsValue(Object value) {
959		if (value == null)
960		throw new NullPointerException();
961	<	Object v;
962	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
963	<	while ((v = it.advance()) != null) {
964	<	if (v == value || value.equals(v))
965	<	return true;
961	>	Node<K,V>[] t;
962	>	if ((t = table) != null) {
963	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
964	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
965	>	V v;
966	>	if ((v = p.val) == value || (v != null && value.equals(v)))
967	>	return true;
968	>	}
969		}
970		return false;
971		}
972
973		/**
2562	–	* Legacy method testing if some key maps into the specified value
2563	–	* in this table.  This method is identical in functionality to
2564	–	* {@link #containsValue}, and exists solely to ensure
2565	–	* full compatibility with class {@link java.util.Hashtable},
2566	–	* which supported this method prior to introduction of the
2567	–	* Java Collections framework.
2568	–	*
2569	–	* @param  value a value to search for
2570	–	* @return {@code true} if and only if some key maps to the
2571	–	*         {@code value} argument in this table as
2572	–	*         determined by the {@code equals} method;
2573	–	*         {@code false} otherwise
2574	–	* @throws NullPointerException if the specified value is null
2575	–	*/
2576	–	public boolean contains(Object value) {
2577	–	return containsValue(value);
2578	–	}
2579	–
2580	–	/**
974		* Maps the specified key to the specified value in this table.
975		* Neither the key nor the value can be null.
976		*
977	<	* <p> The value can be retrieved by calling the {@code get} method
977	>	* <p>The value can be retrieved by calling the {@code get} method
978		* with a key that is equal to the original key.
979		*
980		* @param key key with which the specified value is to be associated
#	Line 2590 | Line 983 | public class ConcurrentHashMapV8<K, V>
983		*         {@code null} if there was no mapping for {@code key}
984		* @throws NullPointerException if the specified key or value is null
985		*/
986	<	@SuppressWarnings("unchecked") public V put(K key, V value) {
987	<	if (key == null || value == null)
2595	<	throw new NullPointerException();
2596	<	return (V)internalPut(key, value);
986	>	public V put(K key, V value) {
987	>	return putVal(key, value, false);
988		}
989
990	<	/**
991	<	* {@inheritDoc}
992	<	*
993	<	* @return the previous value associated with the specified key,
994	<	*         or {@code null} if there was no mapping for the key
995	<	* @throws NullPointerException if the specified key or value is null
996	<	*/
997	<	@SuppressWarnings("unchecked") public V putIfAbsent(K key, V value) {
998	<	if (key == null || value == null)
999	<	throw new NullPointerException();
1000	<	return (V)internalPutIfAbsent(key, value);
990	>	/** Implementation for put and putIfAbsent */
991	>	final V putVal(K key, V value, boolean onlyIfAbsent) {
992	>	if (key == null || value == null) throw new NullPointerException();
993	>	int hash = spread(key.hashCode());
994	>	int binCount = 0;
995	>	for (Node<K,V>[] tab = table;;) {
996	>	Node<K,V> f; int n, i, fh;
997	>	if (tab == null || (n = tab.length) == 0)
998	>	tab = initTable();
999	>	else if ((f = tabAt(tab, i = (n - 1) & hash)) == null) {
1000	>	if (casTabAt(tab, i, null,
1001	>	new Node<K,V>(hash, key, value, null)))
1002	>	break;                   // no lock when adding to empty bin
1003	>	}
1004	>	else if ((fh = f.hash) == MOVED)
1005	>	tab = helpTransfer(tab, f);
1006	>	else {
1007	>	V oldVal = null;
1008	>	synchronized (f) {
1009	>	if (tabAt(tab, i) == f) {
1010	>	if (fh >= 0) {
1011	>	binCount = 1;
1012	>	for (Node<K,V> e = f;; ++binCount) {
1013	>	K ek;
1014	>	if (e.hash == hash &&
1015	>	((ek = e.key) == key ||
1016	>	(ek != null && key.equals(ek)))) {
1017	>	oldVal = e.val;
1018	>	if (!onlyIfAbsent)
1019	>	e.val = value;
1020	>	break;
1021	>	}
1022	>	Node<K,V> pred = e;
1023	>	if ((e = e.next) == null) {
1024	>	pred.next = new Node<K,V>(hash, key,
1025	>	value, null);
1026	>	break;
1027	>	}
1028	>	}
1029	>	}
1030	>	else if (f instanceof TreeBin) {
1031	>	Node<K,V> p;
1032	>	binCount = 2;
1033	>	if ((p = ((TreeBin<K,V>)f).putTreeVal(hash, key,
1034	>	value)) != null) {
1035	>	oldVal = p.val;
1036	>	if (!onlyIfAbsent)
1037	>	p.val = value;
1038	>	}
1039	>	}
1040	>	}
1041	>	}
1042	>	if (binCount != 0) {
1043	>	if (binCount >= TREEIFY_THRESHOLD)
1044	>	treeifyBin(tab, i);
1045	>	if (oldVal != null)
1046	>	return oldVal;
1047	>	break;
1048	>	}
1049	>	}
1050	>	}
1051	>	addCount(1L, binCount);
1052	>	return null;
1053		}
1054
1055		/**
#	Line 2617 | Line 1060 | public class ConcurrentHashMapV8<K, V>
1060		* @param m mappings to be stored in this map
1061		*/
1062		public void putAll(Map<? extends K, ? extends V> m) {
1063	<	internalPutAll(m);
1064	<	}
1065	<
2623	<	/**
2624	<	* If the specified key is not already associated with a value,
2625	<	* computes its value using the given mappingFunction and enters
2626	<	* it into the map unless null.  This is equivalent to
2627	<	* <pre> {@code
2628	<	* if (map.containsKey(key))
2629	<	*   return map.get(key);
2630	<	* value = mappingFunction.apply(key);
2631	<	* if (value != null)
2632	<	*   map.put(key, value);
2633	<	* return value;}</pre>
2634	<	*
2635	<	* except that the action is performed atomically.  If the
2636	<	* function returns {@code null} no mapping is recorded. If the
2637	<	* function itself throws an (unchecked) exception, the exception
2638	<	* is rethrown to its caller, and no mapping is recorded.  Some
2639	<	* attempted update operations on this map by other threads may be
2640	<	* blocked while computation is in progress, so the computation
2641	<	* should be short and simple, and must not attempt to update any
2642	<	* other mappings of this Map. The most appropriate usage is to
2643	<	* construct a new object serving as an initial mapped value, or
2644	<	* memoized result, as in:
2645	<	*
2646	<	*  <pre> {@code
2647	<	* map.computeIfAbsent(key, new Fun<K, V>() {
2648	<	*   public V map(K k) { return new Value(f(k)); }});}</pre>
2649	<	*
2650	<	* @param key key with which the specified value is to be associated
2651	<	* @param mappingFunction the function to compute a value
2652	<	* @return the current (existing or computed) value associated with
2653	<	*         the specified key, or null if the computed value is null
2654	<	* @throws NullPointerException if the specified key or mappingFunction
2655	<	*         is null
2656	<	* @throws IllegalStateException if the computation detectably
2657	<	*         attempts a recursive update to this map that would
2658	<	*         otherwise never complete
2659	<	* @throws RuntimeException or Error if the mappingFunction does so,
2660	<	*         in which case the mapping is left unestablished
2661	<	*/
2662	<	@SuppressWarnings("unchecked") public V computeIfAbsent
2663	<	(K key, Fun<? super K, ? extends V> mappingFunction) {
2664	<	if (key == null || mappingFunction == null)
2665	<	throw new NullPointerException();
2666	<	return (V)internalComputeIfAbsent(key, mappingFunction);
2667	<	}
2668	<
2669	<	/**
2670	<	* If the given key is present, computes a new mapping value given a key and
2671	<	* its current mapped value. This is equivalent to
2672	<	*  <pre> {@code
2673	<	*   if (map.containsKey(key)) {
2674	<	*     value = remappingFunction.apply(key, map.get(key));
2675	<	*     if (value != null)
2676	<	*       map.put(key, value);
2677	<	*     else
2678	<	*       map.remove(key);
2679	<	*   }
2680	<	* }</pre>
2681	<	*
2682	<	* except that the action is performed atomically.  If the
2683	<	* function returns {@code null}, the mapping is removed.  If the
2684	<	* function itself throws an (unchecked) exception, the exception
2685	<	* is rethrown to its caller, and the current mapping is left
2686	<	* unchanged.  Some attempted update operations on this map by
2687	<	* other threads may be blocked while computation is in progress,
2688	<	* so the computation should be short and simple, and must not
2689	<	* attempt to update any other mappings of this Map. For example,
2690	<	* to either create or append new messages to a value mapping:
2691	<	*
2692	<	* @param key key with which the specified value is to be associated
2693	<	* @param remappingFunction the function to compute a value
2694	<	* @return the new value associated with the specified key, or null if none
2695	<	* @throws NullPointerException if the specified key or remappingFunction
2696	<	*         is null
2697	<	* @throws IllegalStateException if the computation detectably
2698	<	*         attempts a recursive update to this map that would
2699	<	*         otherwise never complete
2700	<	* @throws RuntimeException or Error if the remappingFunction does so,
2701	<	*         in which case the mapping is unchanged
2702	<	*/
2703	<	@SuppressWarnings("unchecked") public V computeIfPresent
2704	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
2705	<	if (key == null || remappingFunction == null)
2706	<	throw new NullPointerException();
2707	<	return (V)internalCompute(key, true, remappingFunction);
2708	<	}
2709	<
2710	<	/**
2711	<	* Computes a new mapping value given a key and
2712	<	* its current mapped value (or {@code null} if there is no current
2713	<	* mapping). This is equivalent to
2714	<	*  <pre> {@code
2715	<	*   value = remappingFunction.apply(key, map.get(key));
2716	<	*   if (value != null)
2717	<	*     map.put(key, value);
2718	<	*   else
2719	<	*     map.remove(key);
2720	<	* }</pre>
2721	<	*
2722	<	* except that the action is performed atomically.  If the
2723	<	* function returns {@code null}, the mapping is removed.  If the
2724	<	* function itself throws an (unchecked) exception, the exception
2725	<	* is rethrown to its caller, and the current mapping is left
2726	<	* unchanged.  Some attempted update operations on this map by
2727	<	* other threads may be blocked while computation is in progress,
2728	<	* so the computation should be short and simple, and must not
2729	<	* attempt to update any other mappings of this Map. For example,
2730	<	* to either create or append new messages to a value mapping:
2731	<	*
2732	<	* <pre> {@code
2733	<	* Map<Key, String> map = ...;
2734	<	* final String msg = ...;
2735	<	* map.compute(key, new BiFun<Key, String, String>() {
2736	<	*   public String apply(Key k, String v) {
2737	<	*    return (v == null) ? msg : v + msg;});}}</pre>
2738	<	*
2739	<	* @param key key with which the specified value is to be associated
2740	<	* @param remappingFunction the function to compute a value
2741	<	* @return the new value associated with the specified key, or null if none
2742	<	* @throws NullPointerException if the specified key or remappingFunction
2743	<	*         is null
2744	<	* @throws IllegalStateException if the computation detectably
2745	<	*         attempts a recursive update to this map that would
2746	<	*         otherwise never complete
2747	<	* @throws RuntimeException or Error if the remappingFunction does so,
2748	<	*         in which case the mapping is unchanged
2749	<	*/
2750	<	@SuppressWarnings("unchecked") public V compute
2751	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
2752	<	if (key == null || remappingFunction == null)
2753	<	throw new NullPointerException();
2754	<	return (V)internalCompute(key, false, remappingFunction);
2755	<	}
2756	<
2757	<	/**
2758	<	* If the specified key is not already associated
2759	<	* with a value, associate it with the given value.
2760	<	* Otherwise, replace the value with the results of
2761	<	* the given remapping function. This is equivalent to:
2762	<	*  <pre> {@code
2763	<	*   if (!map.containsKey(key))
2764	<	*     map.put(value);
2765	<	*   else {
2766	<	*     newValue = remappingFunction.apply(map.get(key), value);
2767	<	*     if (value != null)
2768	<	*       map.put(key, value);
2769	<	*     else
2770	<	*       map.remove(key);
2771	<	*   }
2772	<	* }</pre>
2773	<	* except that the action is performed atomically.  If the
2774	<	* function returns {@code null}, the mapping is removed.  If the
2775	<	* function itself throws an (unchecked) exception, the exception
2776	<	* is rethrown to its caller, and the current mapping is left
2777	<	* unchanged.  Some attempted update operations on this map by
2778	<	* other threads may be blocked while computation is in progress,
2779	<	* so the computation should be short and simple, and must not
2780	<	* attempt to update any other mappings of this Map.
2781	<	*/
2782	<	@SuppressWarnings("unchecked") public V merge
2783	<	(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
2784	<	if (key == null || value == null || remappingFunction == null)
2785	<	throw new NullPointerException();
2786	<	return (V)internalMerge(key, value, remappingFunction);
1063	>	tryPresize(m.size());
1064	>	for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
1065	>	putVal(e.getKey(), e.getValue(), false);
1066		}
1067
1068		/**
#	Line 2795 | Line 1074 | public class ConcurrentHashMapV8<K, V>
1074		*         {@code null} if there was no mapping for {@code key}
1075		* @throws NullPointerException if the specified key is null
1076		*/
1077	<	@SuppressWarnings("unchecked") public V remove(Object key) {
1078	<	if (key == null)
2800	<	throw new NullPointerException();
2801	<	return (V)internalReplace(key, null, null);
2802	<	}
2803	<
2804	<	/**
2805	<	* {@inheritDoc}
2806	<	*
2807	<	* @throws NullPointerException if the specified key is null
2808	<	*/
2809	<	public boolean remove(Object key, Object value) {
2810	<	if (key == null)
2811	<	throw new NullPointerException();
2812	<	if (value == null)
2813	<	return false;
2814	<	return internalReplace(key, null, value) != null;
2815	<	}
2816	<
2817	<	/**
2818	<	* {@inheritDoc}
2819	<	*
2820	<	* @throws NullPointerException if any of the arguments are null
2821	<	*/
2822	<	public boolean replace(K key, V oldValue, V newValue) {
2823	<	if (key == null || oldValue == null || newValue == null)
2824	<	throw new NullPointerException();
2825	<	return internalReplace(key, newValue, oldValue) != null;
1077	>	public V remove(Object key) {
1078	>	return replaceNode(key, null, null);
1079		}
1080
1081		/**
1082	<	* {@inheritDoc}
1083	<	*
1084	<	* @return the previous value associated with the specified key,
2832	<	*         or {@code null} if there was no mapping for the key
2833	<	* @throws NullPointerException if the specified key or value is null
1082	>	* Implementation for the four public remove/replace methods:
1083	>	* Replaces node value with v, conditional upon match of cv if
1084	>	* non-null.  If resulting value is null, delete.
1085		*/
1086	<	@SuppressWarnings("unchecked") public V replace(K key, V value) {
1087	<	if (key == null || value == null)
1088	<	throw new NullPointerException();
1089	<	return (V)internalReplace(key, value, null);
1086	>	final V replaceNode(Object key, V value, Object cv) {
1087	>	int hash = spread(key.hashCode());
1088	>	for (Node<K,V>[] tab = table;;) {
1089	>	Node<K,V> f; int n, i, fh;
1090	>	if (tab == null || (n = tab.length) == 0 ||
1091	>	(f = tabAt(tab, i = (n - 1) & hash)) == null)
1092	>	break;
1093	>	else if ((fh = f.hash) == MOVED)
1094	>	tab = helpTransfer(tab, f);
1095	>	else {
1096	>	V oldVal = null;
1097	>	boolean validated = false;
1098	>	synchronized (f) {
1099	>	if (tabAt(tab, i) == f) {
1100	>	if (fh >= 0) {
1101	>	validated = true;
1102	>	for (Node<K,V> e = f, pred = null;;) {
1103	>	K ek;
1104	>	if (e.hash == hash &&
1105	>	((ek = e.key) == key ||
1106	>	(ek != null && key.equals(ek)))) {
1107	>	V ev = e.val;
1108	>	if (cv == null || cv == ev ||
1109	>	(ev != null && cv.equals(ev))) {
1110	>	oldVal = ev;
1111	>	if (value != null)
1112	>	e.val = value;
1113	>	else if (pred != null)
1114	>	pred.next = e.next;
1115	>	else
1116	>	setTabAt(tab, i, e.next);
1117	>	}
1118	>	break;
1119	>	}
1120	>	pred = e;
1121	>	if ((e = e.next) == null)
1122	>	break;
1123	>	}
1124	>	}
1125	>	else if (f instanceof TreeBin) {
1126	>	validated = true;
1127	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1128	>	TreeNode<K,V> r, p;
1129	>	if ((r = t.root) != null &&
1130	>	(p = r.findTreeNode(hash, key, null)) != null) {
1131	>	V pv = p.val;
1132	>	if (cv == null || cv == pv ||
1133	>	(pv != null && cv.equals(pv))) {
1134	>	oldVal = pv;
1135	>	if (value != null)
1136	>	p.val = value;
1137	>	else if (t.removeTreeNode(p))
1138	>	setTabAt(tab, i, untreeify(t.first));
1139	>	}
1140	>	}
1141	>	}
1142	>	}
1143	>	}
1144	>	if (validated) {
1145	>	if (oldVal != null) {
1146	>	if (value == null)
1147	>	addCount(-1L, -1);
1148	>	return oldVal;
1149	>	}
1150	>	break;
1151	>	}
1152	>	}
1153	>	}
1154	>	return null;
1155		}
1156
1157		/**
1158		* Removes all of the mappings from this map.
1159		*/
1160		public void clear() {
1161	<	internalClear();
1161	>	long delta = 0L; // negative number of deletions
1162	>	int i = 0;
1163	>	Node<K,V>[] tab = table;
1164	>	while (tab != null && i < tab.length) {
1165	>	int fh;
1166	>	Node<K,V> f = tabAt(tab, i);
1167	>	if (f == null)
1168	>	++i;
1169	>	else if ((fh = f.hash) == MOVED) {
1170	>	tab = helpTransfer(tab, f);
1171	>	i = 0; // restart
1172	>	}
1173	>	else {
1174	>	synchronized (f) {
1175	>	if (tabAt(tab, i) == f) {
1176	>	Node<K,V> p = (fh >= 0 ? f :
1177	>	(f instanceof TreeBin) ?
1178	>	((TreeBin<K,V>)f).first : null);
1179	>	while (p != null) {
1180	>	--delta;
1181	>	p = p.next;
1182	>	}
1183	>	setTabAt(tab, i++, null);
1184	>	}
1185	>	}
1186	>	}
1187	>	}
1188	>	if (delta != 0L)
1189	>	addCount(delta, -1);
1190		}
1191
1192		/**
1193		* Returns a {@link Set} view of the keys contained in this map.
1194		* The set is backed by the map, so changes to the map are
1195	<	* reflected in the set, and vice-versa.  The set supports element
1195	>	* reflected in the set, and vice-versa. The set supports element
1196		* removal, which removes the corresponding mapping from this map,
1197		* via the {@code Iterator.remove}, {@code Set.remove},
1198		* {@code removeAll}, {@code retainAll}, and {@code clear}
#	Line 2860 | Line 1204 | public class ConcurrentHashMapV8<K, V>
1204		* and guarantees to traverse elements as they existed upon
1205		* construction of the iterator, and may (but is not guaranteed to)
1206		* reflect any modifications subsequent to construction.
1207	+	*
1208	+	* @return the set view
1209		*/
1210	<	public Set<K> keySet() {
1211	<	KeySet<K,V> ks = keySet;
1212	<	return (ks != null) ? ks : (keySet = new KeySet<K,V>(this));
1210	>	public KeySetView<K,V> keySet() {
1211	>	KeySetView<K,V> ks;
1212	>	return (ks = keySet) != null ? ks : (keySet = new KeySetView<K,V>(this, null));
1213		}
1214
1215		/**
#	Line 2881 | Line 1227 | public class ConcurrentHashMapV8<K, V>
1227		* and guarantees to traverse elements as they existed upon
1228		* construction of the iterator, and may (but is not guaranteed to)
1229		* reflect any modifications subsequent to construction.
1230	+	*
1231	+	* @return the collection view
1232		*/
1233		public Collection<V> values() {
1234	<	Values<K,V> vs = values;
1235	<	return (vs != null) ? vs : (values = new Values<K,V>(this));
1234	>	ValuesView<K,V> vs;
1235	>	return (vs = values) != null ? vs : (values = new ValuesView<K,V>(this));
1236		}
1237
1238		/**
#	Line 2894 | Line 1242 | public class ConcurrentHashMapV8<K, V>
1242		* removal, which removes the corresponding mapping from the map,
1243		* via the {@code Iterator.remove}, {@code Set.remove},
1244		* {@code removeAll}, {@code retainAll}, and {@code clear}
1245	<	* operations.  It does not support the {@code add} or
2898	<	* {@code addAll} operations.
1245	>	* operations.
1246		*
1247		* <p>The view's {@code iterator} is a "weakly consistent" iterator
1248		* that will never throw {@link ConcurrentModificationException},
1249		* and guarantees to traverse elements as they existed upon
1250		* construction of the iterator, and may (but is not guaranteed to)
1251		* reflect any modifications subsequent to construction.
2905	–	*/
2906	–	public Set<Map.Entry<K,V>> entrySet() {
2907	–	EntrySet<K,V> es = entrySet;
2908	–	return (es != null) ? es : (entrySet = new EntrySet<K,V>(this));
2909	–	}
2910	–
2911	–	/**
2912	–	* Returns an enumeration of the keys in this table.
2913	–	*
2914	–	* @return an enumeration of the keys in this table
2915	–	* @see #keySet()
2916	–	*/
2917	–	public Enumeration<K> keys() {
2918	–	return new KeyIterator<K,V>(this);
2919	–	}
2920	–
2921	–	/**
2922	–	* Returns an enumeration of the values in this table.
2923	–	*
2924	–	* @return an enumeration of the values in this table
2925	–	* @see #values()
2926	–	*/
2927	–	public Enumeration<V> elements() {
2928	–	return new ValueIterator<K,V>(this);
2929	–	}
2930	–
2931	–	/**
2932	–	* Returns a partitionable iterator of the keys in this map.
1252		*
1253	<	* @return a partitionable iterator of the keys in this map
1253	>	* @return the set view
1254		*/
1255	<	public Spliterator<K> keySpliterator() {
1256	<	return new KeyIterator<K,V>(this);
1257	<	}
2939	<
2940	<	/**
2941	<	* Returns a partitionable iterator of the values in this map.
2942	<	*
2943	<	* @return a partitionable iterator of the values in this map
2944	<	*/
2945	<	public Spliterator<V> valueSpliterator() {
2946	<	return new ValueIterator<K,V>(this);
2947	<	}
2948	<
2949	<	/**
2950	<	* Returns a partitionable iterator of the entries in this map.
2951	<	*
2952	<	* @return a partitionable iterator of the entries in this map
2953	<	*/
2954	<	public Spliterator<Map.Entry<K,V>> entrySpliterator() {
2955	<	return new EntryIterator<K,V>(this);
1255	>	public Set<Map.Entry<K,V>> entrySet() {
1256	>	EntrySetView<K,V> es;
1257	>	return (es = entrySet) != null ? es : (entrySet = new EntrySetView<K,V>(this));
1258		}
1259
1260		/**
#	Line 2964 | Line 1266 | public class ConcurrentHashMapV8<K, V>
1266		*/
1267		public int hashCode() {
1268		int h = 0;
1269	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
1270	<	Object v;
1271	<	while ((v = it.advance()) != null) {
1272	<	h += it.nextKey.hashCode() ^ v.hashCode();
1269	>	Node<K,V>[] t;
1270	>	if ((t = table) != null) {
1271	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1272	>	for (Node<K,V> p; (p = it.advance()) != null; )
1273	>	h += p.key.hashCode() ^ p.val.hashCode();
1274		}
1275		return h;
1276		}
#	Line 2984 | Line 1287 | public class ConcurrentHashMapV8<K, V>
1287		* @return a string representation of this map
1288		*/
1289		public String toString() {
1290	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
1290	>	Node<K,V>[] t;
1291	>	int f = (t = table) == null ? 0 : t.length;
1292	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1293		StringBuilder sb = new StringBuilder();
1294		sb.append('{');
1295	<	Object v;
1296	<	if ((v = it.advance()) != null) {
1295	>	Node<K,V> p;
1296	>	if ((p = it.advance()) != null) {
1297		for (;;) {
1298	<	Object k = it.nextKey;
1298	>	K k = p.key;
1299	>	V v = p.val;
1300		sb.append(k == this ? "(this Map)" : k);
1301		sb.append('=');
1302		sb.append(v == this ? "(this Map)" : v);
1303	<	if ((v = it.advance()) == null)
1303	>	if ((p = it.advance()) == null)
1304		break;
1305		sb.append(',').append(' ');
1306		}
#	Line 3017 | Line 1323 | public class ConcurrentHashMapV8<K, V>
1323		if (!(o instanceof Map))
1324		return false;
1325		Map<?,?> m = (Map<?,?>) o;
1326	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
1327	<	Object val;
1328	<	while ((val = it.advance()) != null) {
1329	<	Object v = m.get(it.nextKey);
1326	>	Node<K,V>[] t;
1327	>	int f = (t = table) == null ? 0 : t.length;
1328	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1329	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1330	>	V val = p.val;
1331	>	Object v = m.get(p.key);
1332		if (v == null || (v != val && !v.equals(val)))
1333		return false;
1334		}
#	Line 3028 | Line 1336 | public class ConcurrentHashMapV8<K, V>
1336		Object mk, mv, v;
1337		if ((mk = e.getKey()) == null ||
1338		(mv = e.getValue()) == null ||
1339	<	(v = internalGet(mk)) == null ||
1339	>	(v = get(mk)) == null ||
1340		(mv != v && !mv.equals(v)))
1341		return false;
1342		}
#	Line 3036 | Line 1344 | public class ConcurrentHashMapV8<K, V>
1344		return true;
1345		}
1346
1347	<	/* ----------------Iterators -------------- */
1347	>	/**
1348	>	* Stripped-down version of helper class used in previous version,
1349	>	* declared for the sake of serialization compatibility
1350	>	*/
1351	>	static class Segment<K,V> extends ReentrantLock implements Serializable {
1352	>	private static final long serialVersionUID = 2249069246763182397L;
1353	>	final float loadFactor;
1354	>	Segment(float lf) { this.loadFactor = lf; }
1355	>	}
1356
1357	<	@SuppressWarnings("serial") static final class KeyIterator<K,V> extends Traverser<K,V,Object>
1358	<	implements Spliterator<K>, Enumeration<K> {
1359	<	KeyIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
1360	<	KeyIterator(Traverser<K,V,Object> it) {
1361	<	super(it);
1362	<	}
1363	<	public KeyIterator<K,V> split() {
1364	<	if (last != null || (next != null && nextVal == null))
1365	<	throw new IllegalStateException();
1366	<	return new KeyIterator<K,V>(this);
1367	<	}
1368	<	@SuppressWarnings("unchecked") public final K next() {
1369	<	if (nextVal == null && advance() == null)
1370	<	throw new NoSuchElementException();
1371	<	Object k = nextKey;
1372	<	nextVal = null;
1373	<	return (K) k;
1357	>	/**
1358	>	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
1359	>	* stream (i.e., serializes it).
1360	>	* @param s the stream
1361	>	* @serialData
1362	>	* the key (Object) and value (Object)
1363	>	* for each key-value mapping, followed by a null pair.
1364	>	* The key-value mappings are emitted in no particular order.
1365	>	*/
1366	>	private void writeObject(java.io.ObjectOutputStream s)
1367	>	throws java.io.IOException {
1368	>	// For serialization compatibility
1369	>	// Emulate segment calculation from previous version of this class
1370	>	int sshift = 0;
1371	>	int ssize = 1;
1372	>	while (ssize < DEFAULT_CONCURRENCY_LEVEL) {
1373	>	++sshift;
1374	>	ssize <<= 1;
1375	>	}
1376	>	int segmentShift = 32 - sshift;
1377	>	int segmentMask = ssize - 1;
1378	>	@SuppressWarnings("unchecked") Segment<K,V>[] segments = (Segment<K,V>[])
1379	>	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
1380	>	for (int i = 0; i < segments.length; ++i)
1381	>	segments[i] = new Segment<K,V>(LOAD_FACTOR);
1382	>	s.putFields().put("segments", segments);
1383	>	s.putFields().put("segmentShift", segmentShift);
1384	>	s.putFields().put("segmentMask", segmentMask);
1385	>	s.writeFields();
1386	>
1387	>	Node<K,V>[] t;
1388	>	if ((t = table) != null) {
1389	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1390	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1391	>	s.writeObject(p.key);
1392	>	s.writeObject(p.val);
1393	>	}
1394		}
1395	<
1396	<	public final K nextElement() { return next(); }
1395	>	s.writeObject(null);
1396	>	s.writeObject(null);
1397	>	segments = null; // throw away
1398		}
1399
1400	<	@SuppressWarnings("serial") static final class ValueIterator<K,V> extends Traverser<K,V,Object>
1401	<	implements Spliterator<V>, Enumeration<V> {
1402	<	ValueIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
1403	<	ValueIterator(Traverser<K,V,Object> it) {
1404	<	super(it);
1405	<	}
1406	<	public ValueIterator<K,V> split() {
1407	<	if (last != null || (next != null && nextVal == null))
1408	<	throw new IllegalStateException();
1409	<	return new ValueIterator<K,V>(this);
1400	>	/**
1401	>	* Reconstitutes the instance from a stream (that is, deserializes it).
1402	>	* @param s the stream
1403	>	*/
1404	>	private void readObject(java.io.ObjectInputStream s)
1405	>	throws java.io.IOException, ClassNotFoundException {
1406	>	/*
1407	>	* To improve performance in typical cases, we create nodes
1408	>	* while reading, then place in table once size is known.
1409	>	* However, we must also validate uniqueness and deal with
1410	>	* overpopulated bins while doing so, which requires
1411	>	* specialized versions of putVal mechanics.
1412	>	*/
1413	>	sizeCtl = -1; // force exclusion for table construction
1414	>	s.defaultReadObject();
1415	>	long size = 0L;
1416	>	Node<K,V> p = null;
1417	>	for (;;) {
1418	>	@SuppressWarnings("unchecked") K k = (K) s.readObject();
1419	>	@SuppressWarnings("unchecked") V v = (V) s.readObject();
1420	>	if (k != null && v != null) {
1421	>	p = new Node<K,V>(spread(k.hashCode()), k, v, p);
1422	>	++size;
1423	>	}
1424	>	else
1425	>	break;
1426		}
1427	<
1428	<	@SuppressWarnings("unchecked") public final V next() {
1429	<	Object v;
1430	<	if ((v = nextVal) == null && (v = advance()) == null)
1431	<	throw new NoSuchElementException();
1432	<	nextVal = null;
1433	<	return (V) v;
1427	>	if (size == 0L)
1428	>	sizeCtl = 0;
1429	>	else {
1430	>	int n;
1431	>	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
1432	>	n = MAXIMUM_CAPACITY;
1433	>	else {
1434	>	int sz = (int)size;
1435	>	n = tableSizeFor(sz + (sz >>> 1) + 1);
1436	>	}
1437	>	@SuppressWarnings({"rawtypes","unchecked"})
1438	>	Node<K,V>[] tab = (Node<K,V>[])new Node[n];
1439	>	int mask = n - 1;
1440	>	long added = 0L;
1441	>	while (p != null) {
1442	>	boolean insertAtFront;
1443	>	Node<K,V> next = p.next, first;
1444	>	int h = p.hash, j = h & mask;
1445	>	if ((first = tabAt(tab, j)) == null)
1446	>	insertAtFront = true;
1447	>	else {
1448	>	K k = p.key;
1449	>	if (first.hash < 0) {
1450	>	TreeBin<K,V> t = (TreeBin<K,V>)first;
1451	>	if (t.putTreeVal(h, k, p.val) == null)
1452	>	++added;
1453	>	insertAtFront = false;
1454	>	}
1455	>	else {
1456	>	int binCount = 0;
1457	>	insertAtFront = true;
1458	>	Node<K,V> q; K qk;
1459	>	for (q = first; q != null; q = q.next) {
1460	>	if (q.hash == h &&
1461	>	((qk = q.key) == k ||
1462	>	(qk != null && k.equals(qk)))) {
1463	>	insertAtFront = false;
1464	>	break;
1465	>	}
1466	>	++binCount;
1467	>	}
1468	>	if (insertAtFront && binCount >= TREEIFY_THRESHOLD) {
1469	>	insertAtFront = false;
1470	>	++added;
1471	>	p.next = first;
1472	>	TreeNode<K,V> hd = null, tl = null;
1473	>	for (q = p; q != null; q = q.next) {
1474	>	TreeNode<K,V> t = new TreeNode<K,V>
1475	>	(q.hash, q.key, q.val, null, null);
1476	>	if ((t.prev = tl) == null)
1477	>	hd = t;
1478	>	else
1479	>	tl.next = t;
1480	>	tl = t;
1481	>	}
1482	>	setTabAt(tab, j, new TreeBin<K,V>(hd));
1483	>	}
1484	>	}
1485	>	}
1486	>	if (insertAtFront) {
1487	>	++added;
1488	>	p.next = first;
1489	>	setTabAt(tab, j, p);
1490	>	}
1491	>	p = next;
1492	>	}
1493	>	table = tab;
1494	>	sizeCtl = n - (n >>> 2);
1495	>	baseCount = added;
1496		}
3082	–
3083	–	public final V nextElement() { return next(); }
1497		}
1498
1499	<	@SuppressWarnings("serial") static final class EntryIterator<K,V> extends Traverser<K,V,Object>
3087	<	implements Spliterator<Map.Entry<K,V>> {
3088	<	EntryIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3089	<	EntryIterator(Traverser<K,V,Object> it) {
3090	<	super(it);
3091	<	}
3092	<	public EntryIterator<K,V> split() {
3093	<	if (last != null || (next != null && nextVal == null))
3094	<	throw new IllegalStateException();
3095	<	return new EntryIterator<K,V>(this);
3096	<	}
1499	>	// ConcurrentMap methods
1500
1501	<	@SuppressWarnings("unchecked") public final Map.Entry<K,V> next() {
1502	<	Object v;
1503	<	if ((v = nextVal) == null && (v = advance()) == null)
1504	<	throw new NoSuchElementException();
1505	<	Object k = nextKey;
1506	<	nextVal = null;
1507	<	return new MapEntry<K,V>((K)k, (V)v, map);
1508	<	}
1501	>	/**
1502	>	* {@inheritDoc}
1503	>	*
1504	>	* @return the previous value associated with the specified key,
1505	>	*         or {@code null} if there was no mapping for the key
1506	>	* @throws NullPointerException if the specified key or value is null
1507	>	*/
1508	>	public V putIfAbsent(K key, V value) {
1509	>	return putVal(key, value, true);
1510		}
1511
1512		/**
1513	<	* Exported Entry for iterators
1513	>	* {@inheritDoc}
1514	>	*
1515	>	* @throws NullPointerException if the specified key is null
1516		*/
1517	<	static final class MapEntry<K,V> implements Map.Entry<K, V> {
1518	<	final K key; // non-null
1519	<	V val;       // non-null
1520	<	final ConcurrentHashMapV8<K, V> map;
3115	<	MapEntry(K key, V val, ConcurrentHashMapV8<K, V> map) {
3116	<	this.key = key;
3117	<	this.val = val;
3118	<	this.map = map;
3119	<	}
3120	<	public final K getKey()       { return key; }
3121	<	public final V getValue()     { return val; }
3122	<	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
3123	<	public final String toString(){ return key + "=" + val; }
3124	<
3125	<	public final boolean equals(Object o) {
3126	<	Object k, v; Map.Entry<?,?> e;
3127	<	return ((o instanceof Map.Entry) &&
3128	<	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
3129	<	(v = e.getValue()) != null &&
3130	<	(k == key || k.equals(key)) &&
3131	<	(v == val || v.equals(val)));
3132	<	}
3133	<
3134	<	/**
3135	<	* Sets our entry's value and writes through to the map. The
3136	<	* value to return is somewhat arbitrary here. Since we do not
3137	<	* necessarily track asynchronous changes, the most recent
3138	<	* "previous" value could be different from what we return (or
3139	<	* could even have been removed in which case the put will
3140	<	* re-establish). We do not and cannot guarantee more.
3141	<	*/
3142	<	public final V setValue(V value) {
3143	<	if (value == null) throw new NullPointerException();
3144	<	V v = val;
3145	<	val = value;
3146	<	map.put(key, value);
3147	<	return v;
3148	<	}
1517	>	public boolean remove(Object key, Object value) {
1518	>	if (key == null)
1519	>	throw new NullPointerException();
1520	>	return value != null && replaceNode(key, null, value) != null;
1521		}
1522
1523	<	/* ----------------Views -------------- */
1523	>	/**
1524	>	* {@inheritDoc}
1525	>	*
1526	>	* @throws NullPointerException if any of the arguments are null
1527	>	*/
1528	>	public boolean replace(K key, V oldValue, V newValue) {
1529	>	if (key == null || oldValue == null || newValue == null)
1530	>	throw new NullPointerException();
1531	>	return replaceNode(key, newValue, oldValue) != null;
1532	>	}
1533
1534		/**
1535	<	* Base class for views.
1535	>	* {@inheritDoc}
1536	>	*
1537	>	* @return the previous value associated with the specified key,
1538	>	*         or {@code null} if there was no mapping for the key
1539	>	* @throws NullPointerException if the specified key or value is null
1540		*/
1541	<	static abstract class CHMView<K, V> {
1542	<	final ConcurrentHashMapV8<K, V> map;
1543	<	CHMView(ConcurrentHashMapV8<K, V> map)  { this.map = map; }
1544	<	public final int size()                 { return map.size(); }
1545	<	public final boolean isEmpty()          { return map.isEmpty(); }
3161	<	public final void clear()               { map.clear(); }
1541	>	public V replace(K key, V value) {
1542	>	if (key == null || value == null)
1543	>	throw new NullPointerException();
1544	>	return replaceNode(key, value, null);
1545	>	}
1546
1547	<	// implementations below rely on concrete classes supplying these
3164	<	abstract public Iterator<?> iterator();
3165	<	abstract public boolean contains(Object o);
3166	<	abstract public boolean remove(Object o);
1547	>	// Overrides of JDK8+ Map extension method defaults
1548
1549	<	private static final String oomeMsg = "Required array size too large";
1549	>	/**
1550	>	* Returns the value to which the specified key is mapped, or the
1551	>	* given default value if this map contains no mapping for the
1552	>	* key.
1553	>	*
1554	>	* @param key the key whose associated value is to be returned
1555	>	* @param defaultValue the value to return if this map contains
1556	>	* no mapping for the given key
1557	>	* @return the mapping for the key, if present; else the default value
1558	>	* @throws NullPointerException if the specified key is null
1559	>	*/
1560	>	public V getOrDefault(Object key, V defaultValue) {
1561	>	V v;
1562	>	return (v = get(key)) == null ? defaultValue : v;
1563	>	}
1564	>
1565	>	public void forEach(BiAction<? super K, ? super V> action) {
1566	>	if (action == null) throw new NullPointerException();
1567	>	Node<K,V>[] t;
1568	>	if ((t = table) != null) {
1569	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1570	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1571	>	action.apply(p.key, p.val);
1572	>	}
1573	>	}
1574	>	}
1575
1576	<	public final Object[] toArray() {
1577	<	long sz = map.mappingCount();
1578	<	if (sz > (long)(MAX_ARRAY_SIZE))
1579	<	throw new OutOfMemoryError(oomeMsg);
1580	<	int n = (int)sz;
1581	<	Object[] r = new Object[n];
1582	<	int i = 0;
1583	<	Iterator<?> it = iterator();
1584	<	while (it.hasNext()) {
1585	<	if (i == n) {
1586	<	if (n >= MAX_ARRAY_SIZE)
1587	<	throw new OutOfMemoryError(oomeMsg);
1588	<	if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
1589	<	n = MAX_ARRAY_SIZE;
3184	<	else
3185	<	n += (n >>> 1) + 1;
3186	<	r = Arrays.copyOf(r, n);
1576	>	public void replaceAll(BiFun<? super K, ? super V, ? extends V> function) {
1577	>	if (function == null) throw new NullPointerException();
1578	>	Node<K,V>[] t;
1579	>	if ((t = table) != null) {
1580	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1581	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1582	>	V oldValue = p.val;
1583	>	for (K key = p.key;;) {
1584	>	V newValue = function.apply(key, oldValue);
1585	>	if (newValue == null)
1586	>	throw new NullPointerException();
1587	>	if (replaceNode(key, newValue, oldValue) != null ||
1588	>	(oldValue = get(key)) == null)
1589	>	break;
1590		}
3188	–	r[i++] = it.next();
1591		}
3190	–	return (i == n) ? r : Arrays.copyOf(r, i);
1592		}
1593	+	}
1594
1595	<	@SuppressWarnings("unchecked") public final <T> T[] toArray(T[] a) {
1596	<	long sz = map.mappingCount();
1597	<	if (sz > (long)(MAX_ARRAY_SIZE))
1598	<	throw new OutOfMemoryError(oomeMsg);
1599	<	int m = (int)sz;
1600	<	T[] r = (a.length >= m) ? a :
1601	<	(T[])java.lang.reflect.Array
1602	<	.newInstance(a.getClass().getComponentType(), m);
1603	<	int n = r.length;
1604	<	int i = 0;
1605	<	Iterator<?> it = iterator();
1606	<	while (it.hasNext()) {
1607	<	if (i == n) {
1608	<	if (n >= MAX_ARRAY_SIZE)
1609	<	throw new OutOfMemoryError(oomeMsg);
1610	<	if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
1611	<	n = MAX_ARRAY_SIZE;
1612	<	else
1613	<	n += (n >>> 1) + 1;
1614	<	r = Arrays.copyOf(r, n);
1595	>	/**
1596	>	* If the specified key is not already associated with a value,
1597	>	* attempts to compute its value using the given mapping function
1598	>	* and enters it into this map unless {@code null}.  The entire
1599	>	* method invocation is performed atomically, so the function is
1600	>	* applied at most once per key.  Some attempted update operations
1601	>	* on this map by other threads may be blocked while computation
1602	>	* is in progress, so the computation should be short and simple,
1603	>	* and must not attempt to update any other mappings of this map.
1604	>	*
1605	>	* @param key key with which the specified value is to be associated
1606	>	* @param mappingFunction the function to compute a value
1607	>	* @return the current (existing or computed) value associated with
1608	>	*         the specified key, or null if the computed value is null
1609	>	* @throws NullPointerException if the specified key or mappingFunction
1610	>	*         is null
1611	>	* @throws IllegalStateException if the computation detectably
1612	>	*         attempts a recursive update to this map that would
1613	>	*         otherwise never complete
1614	>	* @throws RuntimeException or Error if the mappingFunction does so,
1615	>	*         in which case the mapping is left unestablished
1616	>	*/
1617	>	public V computeIfAbsent(K key, Fun<? super K, ? extends V> mappingFunction) {
1618	>	if (key == null || mappingFunction == null)
1619	>	throw new NullPointerException();
1620	>	int h = spread(key.hashCode());
1621	>	V val = null;
1622	>	int binCount = 0;
1623	>	for (Node<K,V>[] tab = table;;) {
1624	>	Node<K,V> f; int n, i, fh;
1625	>	if (tab == null || (n = tab.length) == 0)
1626	>	tab = initTable();
1627	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1628	>	Node<K,V> r = new ReservationNode<K,V>();
1629	>	synchronized (r) {
1630	>	if (casTabAt(tab, i, null, r)) {
1631	>	binCount = 1;
1632	>	Node<K,V> node = null;
1633	>	try {
1634	>	if ((val = mappingFunction.apply(key)) != null)
1635	>	node = new Node<K,V>(h, key, val, null);
1636	>	} finally {
1637	>	setTabAt(tab, i, node);
1638	>	}
1639	>	}
1640		}
1641	<	r[i++] = (T)it.next();
1641	>	if (binCount != 0)
1642	>	break;
1643		}
1644	<	if (a == r && i < n) {
1645	<	r[i] = null; // null-terminate
1646	<	return r;
1644	>	else if ((fh = f.hash) == MOVED)
1645	>	tab = helpTransfer(tab, f);
1646	>	else {
1647	>	boolean added = false;
1648	>	synchronized (f) {
1649	>	if (tabAt(tab, i) == f) {
1650	>	if (fh >= 0) {
1651	>	binCount = 1;
1652	>	for (Node<K,V> e = f;; ++binCount) {
1653	>	K ek; V ev;
1654	>	if (e.hash == h &&
1655	>	((ek = e.key) == key ||
1656	>	(ek != null && key.equals(ek)))) {
1657	>	val = e.val;
1658	>	break;
1659	>	}
1660	>	Node<K,V> pred = e;
1661	>	if ((e = e.next) == null) {
1662	>	if ((val = mappingFunction.apply(key)) != null) {
1663	>	added = true;
1664	>	pred.next = new Node<K,V>(h, key, val, null);
1665	>	}
1666	>	break;
1667	>	}
1668	>	}
1669	>	}
1670	>	else if (f instanceof TreeBin) {
1671	>	binCount = 2;
1672	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1673	>	TreeNode<K,V> r, p;
1674	>	if ((r = t.root) != null &&
1675	>	(p = r.findTreeNode(h, key, null)) != null)
1676	>	val = p.val;
1677	>	else if ((val = mappingFunction.apply(key)) != null) {
1678	>	added = true;
1679	>	t.putTreeVal(h, key, val);
1680	>	}
1681	>	}
1682	>	}
1683	>	}
1684	>	if (binCount != 0) {
1685	>	if (binCount >= TREEIFY_THRESHOLD)
1686	>	treeifyBin(tab, i);
1687	>	if (!added)
1688	>	return val;
1689	>	break;
1690	>	}
1691		}
3220	–	return (i == n) ? r : Arrays.copyOf(r, i);
3221	–	}
3222	–
3223	–	public final int hashCode() {
3224	–	int h = 0;
3225	–	for (Iterator<?> it = iterator(); it.hasNext();)
3226	–	h += it.next().hashCode();
3227	–	return h;
1692		}
1693	+	if (val != null)
1694	+	addCount(1L, binCount);
1695	+	return val;
1696	+	}
1697
1698	<	public final String toString() {
1699	<	StringBuilder sb = new StringBuilder();
1700	<	sb.append('[');
1701	<	Iterator<?> it = iterator();
1702	<	if (it.hasNext()) {
1703	<	for (;;) {
1704	<	Object e = it.next();
1705	<	sb.append(e == this ? "(this Collection)" : e);
1706	<	if (!it.hasNext())
1707	<	break;
1708	<	sb.append(',').append(' ');
1698	>	/**
1699	>	* If the value for the specified key is present, attempts to
1700	>	* compute a new mapping given the key and its current mapped
1701	>	* value.  The entire method invocation is performed atomically.
1702	>	* Some attempted update operations on this map by other threads
1703	>	* may be blocked while computation is in progress, so the
1704	>	* computation should be short and simple, and must not attempt to
1705	>	* update any other mappings of this map.
1706	>	*
1707	>	* @param key key with which a value may be associated
1708	>	* @param remappingFunction the function to compute a value
1709	>	* @return the new value associated with the specified key, or null if none
1710	>	* @throws NullPointerException if the specified key or remappingFunction
1711	>	*         is null
1712	>	* @throws IllegalStateException if the computation detectably
1713	>	*         attempts a recursive update to this map that would
1714	>	*         otherwise never complete
1715	>	* @throws RuntimeException or Error if the remappingFunction does so,
1716	>	*         in which case the mapping is unchanged
1717	>	*/
1718	>	public V computeIfPresent(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1719	>	if (key == null || remappingFunction == null)
1720	>	throw new NullPointerException();
1721	>	int h = spread(key.hashCode());
1722	>	V val = null;
1723	>	int delta = 0;
1724	>	int binCount = 0;
1725	>	for (Node<K,V>[] tab = table;;) {
1726	>	Node<K,V> f; int n, i, fh;
1727	>	if (tab == null || (n = tab.length) == 0)
1728	>	tab = initTable();
1729	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null)
1730	>	break;
1731	>	else if ((fh = f.hash) == MOVED)
1732	>	tab = helpTransfer(tab, f);
1733	>	else {
1734	>	synchronized (f) {
1735	>	if (tabAt(tab, i) == f) {
1736	>	if (fh >= 0) {
1737	>	binCount = 1;
1738	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1739	>	K ek;
1740	>	if (e.hash == h &&
1741	>	((ek = e.key) == key ||
1742	>	(ek != null && key.equals(ek)))) {
1743	>	val = remappingFunction.apply(key, e.val);
1744	>	if (val != null)
1745	>	e.val = val;
1746	>	else {
1747	>	delta = -1;
1748	>	Node<K,V> en = e.next;
1749	>	if (pred != null)
1750	>	pred.next = en;
1751	>	else
1752	>	setTabAt(tab, i, en);
1753	>	}
1754	>	break;
1755	>	}
1756	>	pred = e;
1757	>	if ((e = e.next) == null)
1758	>	break;
1759	>	}
1760	>	}
1761	>	else if (f instanceof TreeBin) {
1762	>	binCount = 2;
1763	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1764	>	TreeNode<K,V> r, p;
1765	>	if ((r = t.root) != null &&
1766	>	(p = r.findTreeNode(h, key, null)) != null) {
1767	>	val = remappingFunction.apply(key, p.val);
1768	>	if (val != null)
1769	>	p.val = val;
1770	>	else {
1771	>	delta = -1;
1772	>	if (t.removeTreeNode(p))
1773	>	setTabAt(tab, i, untreeify(t.first));
1774	>	}
1775	>	}
1776	>	}
1777	>	}
1778		}
1779	+	if (binCount != 0)
1780	+	break;
1781		}
3243	–	return sb.append(']').toString();
1782		}
1783	+	if (delta != 0)
1784	+	addCount((long)delta, binCount);
1785	+	return val;
1786	+	}
1787
1788	<	public final boolean containsAll(Collection<?> c) {
1789	<	if (c != this) {
1790	<	for (Iterator<?> it = c.iterator(); it.hasNext();) {
1791	<	Object e = it.next();
1792	<	if (e == null || !contains(e))
1793	<	return false;
1788	>	/**
1789	>	* Attempts to compute a mapping for the specified key and its
1790	>	* current mapped value (or {@code null} if there is no current
1791	>	* mapping). The entire method invocation is performed atomically.
1792	>	* Some attempted update operations on this map by other threads
1793	>	* may be blocked while computation is in progress, so the
1794	>	* computation should be short and simple, and must not attempt to
1795	>	* update any other mappings of this Map.
1796	>	*
1797	>	* @param key key with which the specified value is to be associated
1798	>	* @param remappingFunction the function to compute a value
1799	>	* @return the new value associated with the specified key, or null if none
1800	>	* @throws NullPointerException if the specified key or remappingFunction
1801	>	*         is null
1802	>	* @throws IllegalStateException if the computation detectably
1803	>	*         attempts a recursive update to this map that would
1804	>	*         otherwise never complete
1805	>	* @throws RuntimeException or Error if the remappingFunction does so,
1806	>	*         in which case the mapping is unchanged
1807	>	*/
1808	>	public V compute(K key,
1809	>	BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1810	>	if (key == null || remappingFunction == null)
1811	>	throw new NullPointerException();
1812	>	int h = spread(key.hashCode());
1813	>	V val = null;
1814	>	int delta = 0;
1815	>	int binCount = 0;
1816	>	for (Node<K,V>[] tab = table;;) {
1817	>	Node<K,V> f; int n, i, fh;
1818	>	if (tab == null || (n = tab.length) == 0)
1819	>	tab = initTable();
1820	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1821	>	Node<K,V> r = new ReservationNode<K,V>();
1822	>	synchronized (r) {
1823	>	if (casTabAt(tab, i, null, r)) {
1824	>	binCount = 1;
1825	>	Node<K,V> node = null;
1826	>	try {
1827	>	if ((val = remappingFunction.apply(key, null)) != null) {
1828	>	delta = 1;
1829	>	node = new Node<K,V>(h, key, val, null);
1830	>	}
1831	>	} finally {
1832	>	setTabAt(tab, i, node);
1833	>	}
1834	>	}
1835		}
1836	+	if (binCount != 0)
1837	+	break;
1838		}
1839	<	return true;
1840	<	}
1841	<
1842	<	public final boolean removeAll(Collection<?> c) {
1843	<	boolean modified = false;
1844	<	for (Iterator<?> it = iterator(); it.hasNext();) {
1845	<	if (c.contains(it.next())) {
1846	<	it.remove();
1847	<	modified = true;
1839	>	else if ((fh = f.hash) == MOVED)
1840	>	tab = helpTransfer(tab, f);
1841	>	else {
1842	>	synchronized (f) {
1843	>	if (tabAt(tab, i) == f) {
1844	>	if (fh >= 0) {
1845	>	binCount = 1;
1846	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1847	>	K ek;
1848	>	if (e.hash == h &&
1849	>	((ek = e.key) == key ||
1850	>	(ek != null && key.equals(ek)))) {
1851	>	val = remappingFunction.apply(key, e.val);
1852	>	if (val != null)
1853	>	e.val = val;
1854	>	else {
1855	>	delta = -1;
1856	>	Node<K,V> en = e.next;
1857	>	if (pred != null)
1858	>	pred.next = en;
1859	>	else
1860	>	setTabAt(tab, i, en);
1861	>	}
1862	>	break;
1863	>	}
1864	>	pred = e;
1865	>	if ((e = e.next) == null) {
1866	>	val = remappingFunction.apply(key, null);
1867	>	if (val != null) {
1868	>	delta = 1;
1869	>	pred.next =
1870	>	new Node<K,V>(h, key, val, null);
1871	>	}
1872	>	break;
1873	>	}
1874	>	}
1875	>	}
1876	>	else if (f instanceof TreeBin) {
1877	>	binCount = 1;
1878	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1879	>	TreeNode<K,V> r, p;
1880	>	if ((r = t.root) != null)
1881	>	p = r.findTreeNode(h, key, null);
1882	>	else
1883	>	p = null;
1884	>	V pv = (p == null) ? null : p.val;
1885	>	val = remappingFunction.apply(key, pv);
1886	>	if (val != null) {
1887	>	if (p != null)
1888	>	p.val = val;
1889	>	else {
1890	>	delta = 1;
1891	>	t.putTreeVal(h, key, val);
1892	>	}
1893	>	}
1894	>	else if (p != null) {
1895	>	delta = -1;
1896	>	if (t.removeTreeNode(p))
1897	>	setTabAt(tab, i, untreeify(t.first));
1898	>	}
1899	>	}
1900	>	}
1901	>	}
1902	>	if (binCount != 0) {
1903	>	if (binCount >= TREEIFY_THRESHOLD)
1904	>	treeifyBin(tab, i);
1905	>	break;
1906		}
1907		}
3265	–	return modified;
1908		}
1909	+	if (delta != 0)
1910	+	addCount((long)delta, binCount);
1911	+	return val;
1912	+	}
1913
1914	<	public final boolean retainAll(Collection<?> c) {
1915	<	boolean modified = false;
1916	<	for (Iterator<?> it = iterator(); it.hasNext();) {
1917	<	if (!c.contains(it.next())) {
1918	<	it.remove();
1919	<	modified = true;
1914	>	/**
1915	>	* If the specified key is not already associated with a
1916	>	* (non-null) value, associates it with the given value.
1917	>	* Otherwise, replaces the value with the results of the given
1918	>	* remapping function, or removes if {@code null}. The entire
1919	>	* method invocation is performed atomically.  Some attempted
1920	>	* update operations on this map by other threads may be blocked
1921	>	* while computation is in progress, so the computation should be
1922	>	* short and simple, and must not attempt to update any other
1923	>	* mappings of this Map.
1924	>	*
1925	>	* @param key key with which the specified value is to be associated
1926	>	* @param value the value to use if absent
1927	>	* @param remappingFunction the function to recompute a value if present
1928	>	* @return the new value associated with the specified key, or null if none
1929	>	* @throws NullPointerException if the specified key or the
1930	>	*         remappingFunction is null
1931	>	* @throws RuntimeException or Error if the remappingFunction does so,
1932	>	*         in which case the mapping is unchanged
1933	>	*/
1934	>	public V merge(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
1935	>	if (key == null || value == null || remappingFunction == null)
1936	>	throw new NullPointerException();
1937	>	int h = spread(key.hashCode());
1938	>	V val = null;
1939	>	int delta = 0;
1940	>	int binCount = 0;
1941	>	for (Node<K,V>[] tab = table;;) {
1942	>	Node<K,V> f; int n, i, fh;
1943	>	if (tab == null || (n = tab.length) == 0)
1944	>	tab = initTable();
1945	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1946	>	if (casTabAt(tab, i, null, new Node<K,V>(h, key, value, null))) {
1947	>	delta = 1;
1948	>	val = value;
1949	>	break;
1950	>	}
1951	>	}
1952	>	else if ((fh = f.hash) == MOVED)
1953	>	tab = helpTransfer(tab, f);
1954	>	else {
1955	>	synchronized (f) {
1956	>	if (tabAt(tab, i) == f) {
1957	>	if (fh >= 0) {
1958	>	binCount = 1;
1959	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1960	>	K ek;
1961	>	if (e.hash == h &&
1962	>	((ek = e.key) == key ||
1963	>	(ek != null && key.equals(ek)))) {
1964	>	val = remappingFunction.apply(e.val, value);
1965	>	if (val != null)
1966	>	e.val = val;
1967	>	else {
1968	>	delta = -1;
1969	>	Node<K,V> en = e.next;
1970	>	if (pred != null)
1971	>	pred.next = en;
1972	>	else
1973	>	setTabAt(tab, i, en);
1974	>	}
1975	>	break;
1976	>	}
1977	>	pred = e;
1978	>	if ((e = e.next) == null) {
1979	>	delta = 1;
1980	>	val = value;
1981	>	pred.next =
1982	>	new Node<K,V>(h, key, val, null);
1983	>	break;
1984	>	}
1985	>	}
1986	>	}
1987	>	else if (f instanceof TreeBin) {
1988	>	binCount = 2;
1989	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1990	>	TreeNode<K,V> r = t.root;
1991	>	TreeNode<K,V> p = (r == null) ? null :
1992	>	r.findTreeNode(h, key, null);
1993	>	val = (p == null) ? value :
1994	>	remappingFunction.apply(p.val, value);
1995	>	if (val != null) {
1996	>	if (p != null)
1997	>	p.val = val;
1998	>	else {
1999	>	delta = 1;
2000	>	t.putTreeVal(h, key, val);
2001	>	}
2002	>	}
2003	>	else if (p != null) {
2004	>	delta = -1;
2005	>	if (t.removeTreeNode(p))
2006	>	setTabAt(tab, i, untreeify(t.first));
2007	>	}
2008	>	}
2009	>	}
2010	>	}
2011	>	if (binCount != 0) {
2012	>	if (binCount >= TREEIFY_THRESHOLD)
2013	>	treeifyBin(tab, i);
2014	>	break;
2015		}
2016		}
3276	–	return modified;
2017		}
2018	+	if (delta != 0)
2019	+	addCount((long)delta, binCount);
2020	+	return val;
2021	+	}
2022	+
2023	+	// Hashtable legacy methods
2024
2025	+	/**
2026	+	* Legacy method testing if some key maps into the specified value
2027	+	* in this table.  This method is identical in functionality to
2028	+	* {@link #containsValue(Object)}, and exists solely to ensure
2029	+	* full compatibility with class {@link java.util.Hashtable},
2030	+	* which supported this method prior to introduction of the
2031	+	* Java Collections framework.
2032	+	*
2033	+	* @param  value a value to search for
2034	+	* @return {@code true} if and only if some key maps to the
2035	+	*         {@code value} argument in this table as
2036	+	*         determined by the {@code equals} method;
2037	+	*         {@code false} otherwise
2038	+	* @throws NullPointerException if the specified value is null
2039	+	*/
2040	+	@Deprecated public boolean contains(Object value) {
2041	+	return containsValue(value);
2042		}
2043
2044	<	static final class KeySet<K,V> extends CHMView<K,V> implements Set<K> {
2045	<	KeySet(ConcurrentHashMapV8<K, V> map)  {
2046	<	super(map);
2047	<	}
2048	<	public final boolean contains(Object o) { return map.containsKey(o); }
2049	<	public final boolean remove(Object o)   { return map.remove(o) != null; }
2050	<	public final Iterator<K> iterator() {
2051	<	return new KeyIterator<K,V>(map);
2052	<	}
2053	<	public final boolean add(K e) {
3291	<	throw new UnsupportedOperationException();
3292	<	}
3293	<	public final boolean addAll(Collection<? extends K> c) {
3294	<	throw new UnsupportedOperationException();
3295	<	}
3296	<	public boolean equals(Object o) {
3297	<	Set<?> c;
3298	<	return ((o instanceof Set) &&
3299	<	((c = (Set<?>)o) == this ||
3300	<	(containsAll(c) && c.containsAll(this))));
3301	<	}
2044	>	/**
2045	>	* Returns an enumeration of the keys in this table.
2046	>	*
2047	>	* @return an enumeration of the keys in this table
2048	>	* @see #keySet()
2049	>	*/
2050	>	public Enumeration<K> keys() {
2051	>	Node<K,V>[] t;
2052	>	int f = (t = table) == null ? 0 : t.length;
2053	>	return new KeyIterator<K,V>(t, f, 0, f, this);
2054		}
2055
2056	+	/**
2057	+	* Returns an enumeration of the values in this table.
2058	+	*
2059	+	* @return an enumeration of the values in this table
2060	+	* @see #values()
2061	+	*/
2062	+	public Enumeration<V> elements() {
2063	+	Node<K,V>[] t;
2064	+	int f = (t = table) == null ? 0 : t.length;
2065	+	return new ValueIterator<K,V>(t, f, 0, f, this);
2066	+	}
2067
2068	<	static final class Values<K,V> extends CHMView<K,V>
3306	<	implements Collection<V> {
3307	<	Values(ConcurrentHashMapV8<K, V> map)   { super(map); }
3308	<	public final boolean contains(Object o) { return map.containsValue(o); }
3309	<	public final boolean remove(Object o) {
3310	<	if (o != null) {
3311	<	Iterator<V> it = new ValueIterator<K,V>(map);
3312	<	while (it.hasNext()) {
3313	<	if (o.equals(it.next())) {
3314	<	it.remove();
3315	<	return true;
3316	<	}
3317	<	}
3318	<	}
3319	<	return false;
3320	<	}
3321	<	public final Iterator<V> iterator() {
3322	<	return new ValueIterator<K,V>(map);
3323	<	}
3324	<	public final boolean add(V e) {
3325	<	throw new UnsupportedOperationException();
3326	<	}
3327	<	public final boolean addAll(Collection<? extends V> c) {
3328	<	throw new UnsupportedOperationException();
3329	<	}
2068	>	// ConcurrentHashMapV8-only methods
2069
2070	+	/**
2071	+	* Returns the number of mappings. This method should be used
2072	+	* instead of {@link #size} because a ConcurrentHashMapV8 may
2073	+	* contain more mappings than can be represented as an int. The
2074	+	* value returned is an estimate; the actual count may differ if
2075	+	* there are concurrent insertions or removals.
2076	+	*
2077	+	* @return the number of mappings
2078	+	* @since 1.8
2079	+	*/
2080	+	public long mappingCount() {
2081	+	long n = sumCount();
2082	+	return (n < 0L) ? 0L : n; // ignore transient negative values
2083		}
2084
2085	<	static final class EntrySet<K,V> extends CHMView<K,V>
2086	<	implements Set<Map.Entry<K,V>> {
2087	<	EntrySet(ConcurrentHashMapV8<K, V> map) { super(map); }
2088	<	public final boolean contains(Object o) {
2089	<	Object k, v, r; Map.Entry<?,?> e;
2090	<	return ((o instanceof Map.Entry) &&
2091	<	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
2092	<	(r = map.get(k)) != null &&
2093	<	(v = e.getValue()) != null &&
2094	<	(v == r || v.equals(r)));
3343	<	}
3344	<	public final boolean remove(Object o) {
3345	<	Object k, v; Map.Entry<?,?> e;
3346	<	return ((o instanceof Map.Entry) &&
3347	<	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
3348	<	(v = e.getValue()) != null &&
3349	<	map.remove(k, v));
3350	<	}
3351	<	public final Iterator<Map.Entry<K,V>> iterator() {
3352	<	return new EntryIterator<K,V>(map);
3353	<	}
3354	<	public final boolean add(Entry<K,V> e) {
3355	<	throw new UnsupportedOperationException();
3356	<	}
3357	<	public final boolean addAll(Collection<? extends Entry<K,V>> c) {
3358	<	throw new UnsupportedOperationException();
3359	<	}
3360	<	public boolean equals(Object o) {
3361	<	Set<?> c;
3362	<	return ((o instanceof Set) &&
3363	<	((c = (Set<?>)o) == this ||
3364	<	(containsAll(c) && c.containsAll(this))));
3365	<	}
2085	>	/**
2086	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2087	>	* from the given type to {@code Boolean.TRUE}.
2088	>	*
2089	>	* @return the new set
2090	>	* @since 1.8
2091	>	*/
2092	>	public static <K> KeySetView<K,Boolean> newKeySet() {
2093	>	return new KeySetView<K,Boolean>
2094	>	(new ConcurrentHashMapV8<K,Boolean>(), Boolean.TRUE);
2095		}
2096
2097	<	/* ---------------- Serialization Support -------------- */
2097	>	/**
2098	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2099	>	* from the given type to {@code Boolean.TRUE}.
2100	>	*
2101	>	* @param initialCapacity The implementation performs internal
2102	>	* sizing to accommodate this many elements.
2103	>	* @throws IllegalArgumentException if the initial capacity of
2104	>	* elements is negative
2105	>	* @return the new set
2106	>	* @since 1.8
2107	>	*/
2108	>	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2109	>	return new KeySetView<K,Boolean>
2110	>	(new ConcurrentHashMapV8<K,Boolean>(initialCapacity), Boolean.TRUE);
2111	>	}
2112
2113		/**
2114	<	* Stripped-down version of helper class used in previous version,
2115	<	* declared for the sake of serialization compatibility
2114	>	* Returns a {@link Set} view of the keys in this map, using the
2115	>	* given common mapped value for any additions (i.e., {@link
2116	>	* Collection#add} and {@link Collection#addAll(Collection)}).
2117	>	* This is of course only appropriate if it is acceptable to use
2118	>	* the same value for all additions from this view.
2119	>	*
2120	>	* @param mappedValue the mapped value to use for any additions
2121	>	* @return the set view
2122	>	* @throws NullPointerException if the mappedValue is null
2123		*/
2124	<	static class Segment<K,V> implements Serializable {
2125	<	private static final long serialVersionUID = 2249069246763182397L;
2126	<	final float loadFactor;
2127	<	Segment(float lf) { this.loadFactor = lf; }
2124	>	public KeySetView<K,V> keySet(V mappedValue) {
2125	>	if (mappedValue == null)
2126	>	throw new NullPointerException();
2127	>	return new KeySetView<K,V>(this, mappedValue);
2128		}
2129
2130	+	/* ---------------- Special Nodes -------------- */
2131	+
2132		/**
2133	<	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
3382	<	* stream (i.e., serializes it).
3383	<	* @param s the stream
3384	<	* @serialData
3385	<	* the key (Object) and value (Object)
3386	<	* for each key-value mapping, followed by a null pair.
3387	<	* The key-value mappings are emitted in no particular order.
2133	>	* A node inserted at head of bins during transfer operations.
2134		*/
2135	<	@SuppressWarnings("unchecked") private void writeObject(java.io.ObjectOutputStream s)
2136	<	throws java.io.IOException {
2137	<	if (segments == null) { // for serialization compatibility
2138	<	segments = (Segment<K,V>[])
2139	<	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
2140	<	for (int i = 0; i < segments.length; ++i)
2141	<	segments[i] = new Segment<K,V>(LOAD_FACTOR);
2142	<	}
2143	<	s.defaultWriteObject();
2144	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2145	<	Object v;
2146	<	while ((v = it.advance()) != null) {
2147	<	s.writeObject(it.nextKey);
2148	<	s.writeObject(v);
2135	>	static final class ForwardingNode<K,V> extends Node<K,V> {
2136	>	final Node<K,V>[] nextTable;
2137	>	ForwardingNode(Node<K,V>[] tab) {
2138	>	super(MOVED, null, null, null);
2139	>	this.nextTable = tab;
2140	>	}
2141	>
2142	>	Node<K,V> find(int h, Object k) {
2143	>	Node<K,V> e; int n;
2144	>	Node<K,V>[] tab = nextTable;
2145	>	if (k != null && tab != null && (n = tab.length) > 0 &&
2146	>	(e = tabAt(tab, (n - 1) & h)) != null) {
2147	>	do {
2148	>	int eh; K ek;
2149	>	if ((eh = e.hash) == h &&
2150	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2151	>	return e;
2152	>	if (eh < 0)
2153	>	return e.find(h, k);
2154	>	} while ((e = e.next) != null);
2155	>	}
2156	>	return null;
2157		}
3404	–	s.writeObject(null);
3405	–	s.writeObject(null);
3406	–	segments = null; // throw away
2158		}
2159
2160		/**
2161	<	* Reconstitutes the instance from a stream (that is, deserializes it).
3411	<	* @param s the stream
2161	>	* A place-holder node used in computeIfAbsent and compute
2162		*/
2163	<	@SuppressWarnings("unchecked") private void readObject(java.io.ObjectInputStream s)
2164	<	throws java.io.IOException, ClassNotFoundException {
2165	<	s.defaultReadObject();
2166	<	this.segments = null; // unneeded
3417	<	// initialize transient final field
3418	<	UNSAFE.putObjectVolatile(this, counterOffset, new LongAdder());
2163	>	static final class ReservationNode<K,V> extends Node<K,V> {
2164	>	ReservationNode() {
2165	>	super(RESERVED, null, null, null);
2166	>	}
2167
2168	<	// Create all nodes, then place in table once size is known
2169	<	long size = 0L;
3422	<	Node p = null;
3423	<	for (;;) {
3424	<	K k = (K) s.readObject();
3425	<	V v = (V) s.readObject();
3426	<	if (k != null && v != null) {
3427	<	int h = spread(k.hashCode());
3428	<	p = new Node(h, k, v, p);
3429	<	++size;
3430	<	}
3431	<	else
3432	<	break;
2168	>	Node<K,V> find(int h, Object k) {
2169	>	return null;
2170		}
2171	<	if (p != null) {
2172	<	boolean init = false;
2173	<	int n;
2174	<	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
2175	<	n = MAXIMUM_CAPACITY;
2176	<	else {
2177	<	int sz = (int)size;
2178	<	n = tableSizeFor(sz + (sz >>> 1) + 1);
2179	<	}
2180	<	int sc = sizeCtl;
2181	<	boolean collide = false;
2182	<	if (n > sc &&
2183	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2171	>	}
2172	>
2173	>	/* ---------------- Table Initialization and Resizing -------------- */
2174	>
2175	>	/**
2176	>	* Initializes table, using the size recorded in sizeCtl.
2177	>	*/
2178	>	private final Node<K,V>[] initTable() {
2179	>	Node<K,V>[] tab; int sc;
2180	>	while ((tab = table) == null || tab.length == 0) {
2181	>	if ((sc = sizeCtl) < 0)
2182	>	Thread.yield(); // lost initialization race; just spin
2183	>	else if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2184		try {
2185	<	if (table == null) {
2186	<	init = true;
2187	<	Node[] tab = new Node[n];
2188	<	int mask = n - 1;
2189	<	while (p != null) {
3453	<	int j = p.hash & mask;
3454	<	Node next = p.next;
3455	<	Node q = p.next = tabAt(tab, j);
3456	<	setTabAt(tab, j, p);
3457	<	if (!collide && q != null && q.hash == p.hash)
3458	<	collide = true;
3459	<	p = next;
3460	<	}
3461	<	table = tab;
3462	<	counter.add(size);
2185	>	if ((tab = table) == null || tab.length == 0) {
2186	>	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
2187	>	@SuppressWarnings({"rawtypes","unchecked"})
2188	>	Node<K,V>[] nt = (Node<K,V>[])new Node[n];
2189	>	table = tab = nt;
2190		sc = n - (n >>> 2);
2191		}
2192		} finally {
2193		sizeCtl = sc;
2194		}
2195	<	if (collide) { // rescan and convert to TreeBins
3469	<	Node[] tab = table;
3470	<	for (int i = 0; i < tab.length; ++i) {
3471	<	int c = 0;
3472	<	for (Node e = tabAt(tab, i); e != null; e = e.next) {
3473	<	if (++c > TREE_THRESHOLD &&
3474	<	(e.key instanceof Comparable)) {
3475	<	replaceWithTreeBin(tab, i, e.key);
3476	<	break;
3477	<	}
3478	<	}
3479	<	}
3480	<	}
2195	>	break;
2196		}
2197	<	if (!init) { // Can only happen if unsafely published.
2198	<	while (p != null) {
2199	<	internalPut(p.key, p.val);
2200	<	p = p.next;
2197	>	}
2198	>	return tab;
2199	>	}
2200	>
2201	>	/**
2202	>	* Adds to count, and if table is too small and not already
2203	>	* resizing, initiates transfer. If already resizing, helps
2204	>	* perform transfer if work is available.  Rechecks occupancy
2205	>	* after a transfer to see if another resize is already needed
2206	>	* because resizings are lagging additions.
2207	>	*
2208	>	* @param x the count to add
2209	>	* @param check if <0, don't check resize, if <= 1 only check if uncontended
2210	>	*/
2211	>	private final void addCount(long x, int check) {
2212	>	CounterCell[] as; long b, s;
2213	>	if ((as = counterCells) != null ||
2214	>	!U.compareAndSwapLong(this, BASECOUNT, b = baseCount, s = b + x)) {
2215	>	CounterHashCode hc; CounterCell a; long v; int m;
2216	>	boolean uncontended = true;
2217	>	if ((hc = threadCounterHashCode.get()) == null ||
2218	>	as == null || (m = as.length - 1) < 0 ||
2219	>	(a = as[m & hc.code]) == null ||
2220	>	!(uncontended =
2221	>	U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))) {
2222	>	fullAddCount(x, hc, uncontended);
2223	>	return;
2224	>	}
2225	>	if (check <= 1)
2226	>	return;
2227	>	s = sumCount();
2228	>	}
2229	>	if (check >= 0) {
2230	>	Node<K,V>[] tab, nt; int sc;
2231	>	while (s >= (long)(sc = sizeCtl) && (tab = table) != null &&
2232	>	tab.length < MAXIMUM_CAPACITY) {
2233	>	if (sc < 0) {
2234	>	if (sc == -1 || transferIndex <= transferOrigin ||
2235	>	(nt = nextTable) == null)
2236	>	break;
2237	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc - 1))
2238	>	transfer(tab, nt);
2239		}
2240	+	else if (U.compareAndSwapInt(this, SIZECTL, sc, -2))
2241	+	transfer(tab, null);
2242	+	s = sumCount();
2243		}
2244		}
2245		}
2246
2247	+	/**
2248	+	* Helps transfer if a resize is in progress.
2249	+	*/
2250	+	final Node<K,V>[] helpTransfer(Node<K,V>[] tab, Node<K,V> f) {
2251	+	Node<K,V>[] nextTab; int sc;
2252	+	if ((f instanceof ForwardingNode) &&
2253	+	(nextTab = ((ForwardingNode<K,V>)f).nextTable) != null) {
2254	+	if (nextTab == nextTable && tab == table &&
2255	+	transferIndex > transferOrigin && (sc = sizeCtl) < -1 &&
2256	+	U.compareAndSwapInt(this, SIZECTL, sc, sc - 1))
2257	+	transfer(tab, nextTab);
2258	+	return nextTab;
2259	+	}
2260	+	return table;
2261	+	}
2262
2263	<	// -------------------------------------------------------
2263	>	/**
2264	>	* Tries to presize table to accommodate the given number of elements.
2265	>	*
2266	>	* @param size number of elements (doesn't need to be perfectly accurate)
2267	>	*/
2268	>	private final void tryPresize(int size) {
2269	>	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
2270	>	tableSizeFor(size + (size >>> 1) + 1);
2271	>	int sc;
2272	>	while ((sc = sizeCtl) >= 0) {
2273	>	Node<K,V>[] tab = table; int n;
2274	>	if (tab == null || (n = tab.length) == 0) {
2275	>	n = (sc > c) ? sc : c;
2276	>	if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2277	>	try {
2278	>	if (table == tab) {
2279	>	@SuppressWarnings({"rawtypes","unchecked"})
2280	>	Node<K,V>[] nt = (Node<K,V>[])new Node[n];
2281	>	table = nt;
2282	>	sc = n - (n >>> 2);
2283	>	}
2284	>	} finally {
2285	>	sizeCtl = sc;
2286	>	}
2287	>	}
2288	>	}
2289	>	else if (c <= sc || n >= MAXIMUM_CAPACITY)
2290	>	break;
2291	>	else if (tab == table &&
2292	>	U.compareAndSwapInt(this, SIZECTL, sc, -2))
2293	>	transfer(tab, null);
2294	>	}
2295	>	}
2296
2297	<	// Sams
2298	<	/** Interface describing a void action of one argument */
2299	<	public interface Action<A> { void apply(A a); }
2300	<	/** Interface describing a void action of two arguments */
2301	<	public interface BiAction<A,B> { void apply(A a, B b); }
2302	<	/** Interface describing a function of one argument */
2303	<	public interface Fun<A,T> { T apply(A a); }
2304	<	/** Interface describing a function of two arguments */
2305	<	public interface BiFun<A,B,T> { T apply(A a, B b); }
2306	<	/** Interface describing a function of no arguments */
2307	<	public interface Generator<T> { T apply(); }
2308	<	/** Interface describing a function mapping its argument to a double */
2309	<	public interface ObjectToDouble<A> { double apply(A a); }
2310	<	/** Interface describing a function mapping its argument to a long */
2311	<	public interface ObjectToLong<A> { long apply(A a); }
2312	<	/** Interface describing a function mapping its argument to an int */
2313	<	public interface ObjectToInt<A> {int apply(A a); }
2314	<	/** Interface describing a function mapping two arguments to a double */
2315	<	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
2316	<	/** Interface describing a function mapping two arguments to a long */
2317	<	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
2318	<	/** Interface describing a function mapping two arguments to an int */
2319	<	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
2320	<	/** Interface describing a function mapping a double to a double */
2321	<	public interface DoubleToDouble { double apply(double a); }
2322	<	/** Interface describing a function mapping a long to a long */
2323	<	public interface LongToLong { long apply(long a); }
2324	<	/** Interface describing a function mapping an int to an int */
2325	<	public interface IntToInt { int apply(int a); }
2326	<	/** Interface describing a function mapping two doubles to a double */
2327	<	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
2328	<	/** Interface describing a function mapping two longs to a long */
2329	<	public interface LongByLongToLong { long apply(long a, long b); }
2330	<	/** Interface describing a function mapping two ints to an int */
2331	<	public interface IntByIntToInt { int apply(int a, int b); }
2297	>	/**
2298	>	* Moves and/or copies the nodes in each bin to new table. See
2299	>	* above for explanation.
2300	>	*/
2301	>	private final void transfer(Node<K,V>[] tab, Node<K,V>[] nextTab) {
2302	>	int n = tab.length, stride;
2303	>	if ((stride = (NCPU > 1) ? (n >>> 3) / NCPU : n) < MIN_TRANSFER_STRIDE)
2304	>	stride = MIN_TRANSFER_STRIDE; // subdivide range
2305	>	if (nextTab == null) {            // initiating
2306	>	try {
2307	>	@SuppressWarnings({"rawtypes","unchecked"})
2308	>	Node<K,V>[] nt = (Node<K,V>[])new Node[n << 1];
2309	>	nextTab = nt;
2310	>	} catch (Throwable ex) {      // try to cope with OOME
2311	>	sizeCtl = Integer.MAX_VALUE;
2312	>	return;
2313	>	}
2314	>	nextTable = nextTab;
2315	>	transferOrigin = n;
2316	>	transferIndex = n;
2317	>	ForwardingNode<K,V> rev = new ForwardingNode<K,V>(tab);
2318	>	for (int k = n; k > 0;) {    // progressively reveal ready slots
2319	>	int nextk = (k > stride) ? k - stride : 0;
2320	>	for (int m = nextk; m < k; ++m)
2321	>	nextTab[m] = rev;
2322	>	for (int m = n + nextk; m < n + k; ++m)
2323	>	nextTab[m] = rev;
2324	>	U.putOrderedInt(this, TRANSFERORIGIN, k = nextk);
2325	>	}
2326	>	}
2327	>	int nextn = nextTab.length;
2328	>	ForwardingNode<K,V> fwd = new ForwardingNode<K,V>(nextTab);
2329	>	boolean advance = true;
2330	>	for (int i = 0, bound = 0;;) {
2331	>	int nextIndex, nextBound, fh; Node<K,V> f;
2332	>	while (advance) {
2333	>	if (--i >= bound)
2334	>	advance = false;
2335	>	else if ((nextIndex = transferIndex) <= transferOrigin) {
2336	>	i = -1;
2337	>	advance = false;
2338	>	}
2339	>	else if (U.compareAndSwapInt
2340	>	(this, TRANSFERINDEX, nextIndex,
2341	>	nextBound = (nextIndex > stride ?
2342	>	nextIndex - stride : 0))) {
2343	>	bound = nextBound;
2344	>	i = nextIndex - 1;
2345	>	advance = false;
2346	>	}
2347	>	}
2348	>	if (i < 0 || i >= n || i + n >= nextn) {
2349	>	for (int sc;;) {
2350	>	if (U.compareAndSwapInt(this, SIZECTL, sc = sizeCtl, ++sc)) {
2351	>	if (sc == -1) {
2352	>	nextTable = null;
2353	>	table = nextTab;
2354	>	sizeCtl = (n << 1) - (n >>> 1);
2355	>	}
2356	>	return;
2357	>	}
2358	>	}
2359	>	}
2360	>	else if ((f = tabAt(tab, i)) == null) {
2361	>	if (casTabAt(tab, i, null, fwd)) {
2362	>	setTabAt(nextTab, i, null);
2363	>	setTabAt(nextTab, i + n, null);
2364	>	advance = true;
2365	>	}
2366	>	}
2367	>	else if ((fh = f.hash) == MOVED)
2368	>	advance = true; // already processed
2369	>	else {
2370	>	synchronized (f) {
2371	>	if (tabAt(tab, i) == f) {
2372	>	Node<K,V> ln, hn;
2373	>	if (fh >= 0) {
2374	>	int runBit = fh & n;
2375	>	Node<K,V> lastRun = f;
2376	>	for (Node<K,V> p = f.next; p != null; p = p.next) {
2377	>	int b = p.hash & n;
2378	>	if (b != runBit) {
2379	>	runBit = b;
2380	>	lastRun = p;
2381	>	}
2382	>	}
2383	>	if (runBit == 0) {
2384	>	ln = lastRun;
2385	>	hn = null;
2386	>	}
2387	>	else {
2388	>	hn = lastRun;
2389	>	ln = null;
2390	>	}
2391	>	for (Node<K,V> p = f; p != lastRun; p = p.next) {
2392	>	int ph = p.hash; K pk = p.key; V pv = p.val;
2393	>	if ((ph & n) == 0)
2394	>	ln = new Node<K,V>(ph, pk, pv, ln);
2395	>	else
2396	>	hn = new Node<K,V>(ph, pk, pv, hn);
2397	>	}
2398	>	}
2399	>	else if (f instanceof TreeBin) {
2400	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2401	>	TreeNode<K,V> lo = null, loTail = null;
2402	>	TreeNode<K,V> hi = null, hiTail = null;
2403	>	int lc = 0, hc = 0;
2404	>	for (Node<K,V> e = t.first; e != null; e = e.next) {
2405	>	int h = e.hash;
2406	>	TreeNode<K,V> p = new TreeNode<K,V>
2407	>	(h, e.key, e.val, null, null);
2408	>	if ((h & n) == 0) {
2409	>	if ((p.prev = loTail) == null)
2410	>	lo = p;
2411	>	else
2412	>	loTail.next = p;
2413	>	loTail = p;
2414	>	++lc;
2415	>	}
2416	>	else {
2417	>	if ((p.prev = hiTail) == null)
2418	>	hi = p;
2419	>	else
2420	>	hiTail.next = p;
2421	>	hiTail = p;
2422	>	++hc;
2423	>	}
2424	>	}
2425	>	ln = (lc <= UNTREEIFY_THRESHOLD) ? untreeify(lo) :
2426	>	(hc != 0) ? new TreeBin<K,V>(lo) : t;
2427	>	hn = (hc <= UNTREEIFY_THRESHOLD) ? untreeify(hi) :
2428	>	(lc != 0) ? new TreeBin<K,V>(hi) : t;
2429	>	}
2430	>	else
2431	>	ln = hn = null;
2432	>	setTabAt(nextTab, i, ln);
2433	>	setTabAt(nextTab, i + n, hn);
2434	>	setTabAt(tab, i, fwd);
2435	>	advance = true;
2436	>	}
2437	>	}
2438	>	}
2439	>	}
2440	>	}
2441
2442	+	/* ---------------- Conversion from/to TreeBins -------------- */
2443
2444	<	// -------------------------------------------------------
2444	>	/**
2445	>	* Replaces all linked nodes in bin at given index unless table is
2446	>	* too small, in which case resizes instead.
2447	>	*/
2448	>	private final void treeifyBin(Node<K,V>[] tab, int index) {
2449	>	Node<K,V> b; int n, sc;
2450	>	if (tab != null) {
2451	>	if ((n = tab.length) < MIN_TREEIFY_CAPACITY) {
2452	>	if (tab == table && (sc = sizeCtl) >= 0 &&
2453	>	U.compareAndSwapInt(this, SIZECTL, sc, -2))
2454	>	transfer(tab, null);
2455	>	}
2456	>	else if ((b = tabAt(tab, index)) != null) {
2457	>	synchronized (b) {
2458	>	if (tabAt(tab, index) == b) {
2459	>	TreeNode<K,V> hd = null, tl = null;
2460	>	for (Node<K,V> e = b; e != null; e = e.next) {
2461	>	TreeNode<K,V> p =
2462	>	new TreeNode<K,V>(e.hash, e.key, e.val,
2463	>	null, null);
2464	>	if ((p.prev = tl) == null)
2465	>	hd = p;
2466	>	else
2467	>	tl.next = p;
2468	>	tl = p;
2469	>	}
2470	>	setTabAt(tab, index, new TreeBin<K,V>(hd));
2471	>	}
2472	>	}
2473	>	}
2474	>	}
2475	>	}
2476
2477		/**
2478	<	* Returns an extended {@link Parallel} view of this map using the
3535	<	* given executor for bulk parallel operations.
3536	<	*
3537	<	* @param executor the executor
3538	<	* @return a parallel view
2478	>	* Returns a list on non-TreeNodes replacing those in given list.
2479		*/
2480	<	public Parallel parallel(ForkJoinPool executor)  {
2481	<	return new Parallel(executor);
2480	>	static <K,V> Node<K,V> untreeify(Node<K,V> b) {
2481	>	Node<K,V> hd = null, tl = null;
2482	>	for (Node<K,V> q = b; q != null; q = q.next) {
2483	>	Node<K,V> p = new Node<K,V>(q.hash, q.key, q.val, null);
2484	>	if (tl == null)
2485	>	hd = p;
2486	>	else
2487	>	tl.next = p;
2488	>	tl = p;
2489	>	}
2490	>	return hd;
2491		}
2492
2493	+	/* ---------------- TreeNodes -------------- */
2494	+
2495		/**
2496	<	* An extended view of a ConcurrentHashMap supporting bulk
3546	<	* parallel operations. These operations are designed to be
3547	<	* safely, and often sensibly, applied even with maps that are
3548	<	* being concurrently updated by other threads; for example, when
3549	<	* computing a snapshot summary of the values in a shared
3550	<	* registry.  There are three kinds of operation, each with four
3551	<	* forms, accepting functions with Keys, Values, Entries, and
3552	<	* (Key, Value) arguments and/or return values. Because the
3553	<	* elements of a ConcurrentHashMap are not ordered in any
3554	<	* particular way, and may be processed in different orders in
3555	<	* different parallel executions, the correctness of supplied
3556	<	* functions should not depend on any ordering, or on any other
3557	<	* objects or values that may transiently change while computation
3558	<	* is in progress; and except for forEach actions, should ideally
3559	<	* be side-effect-free.
3560	<	*
3561	<	* <ul>
3562	<	* <li> forEach: Perform a given action on each element.
3563	<	* A variant form applies a given transformation on each element
3564	<	* before performing the action.</li>
3565	<	*
3566	<	* <li> search: Return the first available non-null result of
3567	<	* applying a given function on each element; skipping further
3568	<	* search when a result is found.</li>
3569	<	*
3570	<	* <li> reduce: Accumulate each element.  The supplied reduction
3571	<	* function cannot rely on ordering (more formally, it should be
3572	<	* both associative and commutative).  There are five variants:
3573	<	*
3574	<	* <ul>
3575	<	*
3576	<	* <li> Plain reductions. (There is not a form of this method for
3577	<	* (key, value) function arguments since there is no corresponding
3578	<	* return type.)</li>
3579	<	*
3580	<	* <li> Mapped reductions that accumulate the results of a given
3581	<	* function applied to each element.</li>
3582	<	*
3583	<	* <li> Reductions to scalar doubles, longs, and ints, using a
3584	<	* given basis value.</li>
3585	<	*
3586	<	* </li>
3587	<	* </ul>
3588	<	* </ul>
3589	<	*
3590	<	* <p>The concurrency properties of the bulk operations follow
3591	<	* from those of ConcurrentHashMap: Any non-null result returned
3592	<	* from {@code get(key)} and related access methods bears a
3593	<	* happens-before relation with the associated insertion or
3594	<	* update.  The result of any bulk operation reflects the
3595	<	* composition of these per-element relations (but is not
3596	<	* necessarily atomic with respect to the map as a whole unless it
3597	<	* is somehow known to be quiescent).  Conversely, because keys
3598	<	* and values in the map are never null, null serves as a reliable
3599	<	* atomic indicator of the current lack of any result.  To
3600	<	* maintain this property, null serves as an implicit basis for
3601	<	* all non-scalar reduction operations. For the double, long, and
3602	<	* int versions, the basis should be one that, when combined with
3603	<	* any other value, returns that other value (more formally, it
3604	<	* should be the identity element for the reduction). Most common
3605	<	* reductions have these properties; for example, computing a sum
3606	<	* with basis 0 or a minimum with basis MAX_VALUE.
3607	<	*
3608	<	* <p>Search and transformation functions provided as arguments
3609	<	* should similarly return null to indicate the lack of any result
3610	<	* (in which case it is not used). In the case of mapped
3611	<	* reductions, this also enables transformations to serve as
3612	<	* filters, returning null (or, in the case of primitive
3613	<	* specializations, the identity basis) if the element should not
3614	<	* be combined. You can create compound transformations and
3615	<	* filterings by composing them yourself under this "null means
3616	<	* there is nothing there now" rule before using them in search or
3617	<	* reduce operations.
3618	<	*
3619	<	* <p>Methods accepting and/or returning Entry arguments maintain
3620	<	* key-value associations. They may be useful for example when
3621	<	* finding the key for the greatest value. Note that "plain" Entry
3622	<	* arguments can be supplied using {@code new
3623	<	* AbstractMap.SimpleEntry(k,v)}.
3624	<	*
3625	<	* <p> Bulk operations may complete abruptly, throwing an
3626	<	* exception encountered in the application of a supplied
3627	<	* function. Bear in mind when handling such exceptions that other
3628	<	* concurrently executing functions could also have thrown
3629	<	* exceptions, or would have done so if the first exception had
3630	<	* not occurred.
3631	<	*
3632	<	* <p>Parallel speedups compared to sequential processing are
3633	<	* common but not guaranteed.  Operations involving brief
3634	<	* functions on small maps may execute more slowly than sequential
3635	<	* loops if the underlying work to parallelize the computation is
3636	<	* more expensive than the computation itself. Similarly,
3637	<	* parallelization may not lead to much actual parallelism if all
3638	<	* processors are busy performing unrelated tasks.
3639	<	*
3640	<	* <p> All arguments to all task methods must be non-null.
3641	<	*
3642	<	* <p><em>jsr166e note: During transition, this class
3643	<	* uses nested functional interfaces with different names but the
3644	<	* same forms as those expected for JDK8.<em>
2496	>	* Nodes for use in TreeBins
2497		*/
2498	<	public class Parallel {
2499	<	final ForkJoinPool fjp;
2498	>	static final class TreeNode<K,V> extends Node<K,V> {
2499	>	TreeNode<K,V> parent;  // red-black tree links
2500	>	TreeNode<K,V> left;
2501	>	TreeNode<K,V> right;
2502	>	TreeNode<K,V> prev;    // needed to unlink next upon deletion
2503	>	boolean red;
2504
2505	<	/**
2506	<	* Returns an extended view of this map using the given
2507	<	* executor for bulk parallel operations.
2508	<	*
3653	<	* @param executor the executor
3654	<	*/
3655	<	public Parallel(ForkJoinPool executor)  {
3656	<	this.fjp = executor;
2505	>	TreeNode(int hash, K key, V val, Node<K,V> next,
2506	>	TreeNode<K,V> parent) {
2507	>	super(hash, key, val, next);
2508	>	this.parent = parent;
2509		}
2510
2511	<	/**
2512	<	* Performs the given action for each (key, value).
3661	<	*
3662	<	* @param action the action
3663	<	*/
3664	<	public void forEach(BiAction<K,V> action) {
3665	<	fjp.invoke(ForkJoinTasks.forEach
3666	<	(ConcurrentHashMapV8.this, action));
2511	>	Node<K,V> find(int h, Object k) {
2512	>	return findTreeNode(h, k, null);
2513		}
2514
2515		/**
2516	<	* Performs the given action for each non-null transformation
2517	<	* of each (key, value).
3672	<	*
3673	<	* @param transformer a function returning the transformation
3674	<	* for an element, or null of there is no transformation (in
3675	<	* which case the action is not applied)
3676	<	* @param action the action
2516	>	* Returns the TreeNode (or null if not found) for the given key
2517	>	* starting at given root.
2518		*/
2519	<	public <U> void forEach(BiFun<? super K, ? super V, ? extends U> transformer,
2520	<	Action<U> action) {
2521	<	fjp.invoke(ForkJoinTasks.forEach
2522	<	(ConcurrentHashMapV8.this, transformer, action));
2519	>	final TreeNode<K,V> findTreeNode(int h, Object k, Class<?> kc) {
2520	>	if (k != null) {
2521	>	TreeNode<K,V> p = this;
2522	>	do  {
2523	>	int ph, dir; K pk; TreeNode<K,V> q;
2524	>	TreeNode<K,V> pl = p.left, pr = p.right;
2525	>	if ((ph = p.hash) > h)
2526	>	p = pl;
2527	>	else if (ph < h)
2528	>	p = pr;
2529	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2530	>	return p;
2531	>	else if (pl == null && pr == null)
2532	>	break;
2533	>	else if ((kc != null ||
2534	>	(kc = comparableClassFor(k)) != null) &&
2535	>	(dir = compareComparables(kc, k, pk)) != 0)
2536	>	p = (dir < 0) ? pl : pr;
2537	>	else if (pl == null)
2538	>	p = pr;
2539	>	else if (pr == null ||
2540	>	(q = pr.findTreeNode(h, k, kc)) == null)
2541	>	p = pl;
2542	>	else
2543	>	return q;
2544	>	} while (p != null);
2545	>	}
2546	>	return null;
2547		}
2548	+	}
2549
2550	<	/**
2551	<	* Returns a non-null result from applying the given search
2552	<	* function on each (key, value), or null if none.  Upon
2553	<	* success, further element processing is suppressed and the
2554	<	* results of any other parallel invocations of the search
2555	<	* function are ignored.
2556	<	*
2557	<	* @param searchFunction a function returning a non-null
2558	<	* result on success, else null
2559	<	* @return a non-null result from applying the given search
2560	<	* function on each (key, value), or null if none
2561	<	*/
2562	<	public <U> U search(BiFun<? super K, ? super V, ? extends U> searchFunction) {
2563	<	return fjp.invoke(ForkJoinTasks.search
2564	<	(ConcurrentHashMapV8.this, searchFunction));
2550	>	/* ---------------- TreeBins -------------- */
2551	>
2552	>	/**
2553	>	* TreeNodes used at the heads of bins. TreeBins do not hold user
2554	>	* keys or values, but instead point to list of TreeNodes and
2555	>	* their root. They also maintain a parasitic read-write lock
2556	>	* forcing writers (who hold bin lock) to wait for readers (who do
2557	>	* not) to complete before tree restructuring operations.
2558	>	*/
2559	>	static final class TreeBin<K,V> extends Node<K,V> {
2560	>	TreeNode<K,V> root;
2561	>	volatile TreeNode<K,V> first;
2562	>	volatile Thread waiter;
2563	>	volatile int lockState;
2564	>	// values for lockState
2565	>	static final int WRITER = 1; // set while holding write lock
2566	>	static final int WAITER = 2; // set when waiting for write lock
2567	>	static final int READER = 4; // increment value for setting read lock
2568	>
2569	>	/**
2570	>	* Creates bin with initial set of nodes headed by b.
2571	>	*/
2572	>	TreeBin(TreeNode<K,V> b) {
2573	>	super(TREEBIN, null, null, null);
2574	>	this.first = b;
2575	>	TreeNode<K,V> r = null;
2576	>	for (TreeNode<K,V> x = b, next; x != null; x = next) {
2577	>	next = (TreeNode<K,V>)x.next;
2578	>	x.left = x.right = null;
2579	>	if (r == null) {
2580	>	x.parent = null;
2581	>	x.red = false;
2582	>	r = x;
2583	>	}
2584	>	else {
2585	>	Object key = x.key;
2586	>	int hash = x.hash;
2587	>	Class<?> kc = null;
2588	>	for (TreeNode<K,V> p = r;;) {
2589	>	int dir, ph;
2590	>	if ((ph = p.hash) > hash)
2591	>	dir = -1;
2592	>	else if (ph < hash)
2593	>	dir = 1;
2594	>	else if ((kc != null ||
2595	>	(kc = comparableClassFor(key)) != null))
2596	>	dir = compareComparables(kc, key, p.key);
2597	>	else
2598	>	dir = 0;
2599	>	TreeNode<K,V> xp = p;
2600	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2601	>	x.parent = xp;
2602	>	if (dir <= 0)
2603	>	xp.left = x;
2604	>	else
2605	>	xp.right = x;
2606	>	r = balanceInsertion(r, x);
2607	>	break;
2608	>	}
2609	>	}
2610	>	}
2611	>	}
2612	>	this.root = r;
2613		}
2614
2615		/**
2616	<	* Returns the result of accumulating the given transformation
3703	<	* of all (key, value) pairs using the given reducer to
3704	<	* combine values, or null if none.
3705	<	*
3706	<	* @param transformer a function returning the transformation
3707	<	* for an element, or null of there is no transformation (in
3708	<	* which case it is not combined)
3709	<	* @param reducer a commutative associative combining function
3710	<	* @return the result of accumulating the given transformation
3711	<	* of all (key, value) pairs
2616	>	* Acquires write lock for tree restructuring.
2617		*/
2618	<	public <U> U reduce(BiFun<? super K, ? super V, ? extends U> transformer,
2619	<	BiFun<? super U, ? super U, ? extends U> reducer) {
2620	<	return fjp.invoke(ForkJoinTasks.reduce
3716	<	(ConcurrentHashMapV8.this, transformer, reducer));
2618	>	private final void lockRoot() {
2619	>	if (!U.compareAndSwapInt(this, LOCKSTATE, 0, WRITER))
2620	>	contendedLock(); // offload to separate method
2621		}
2622
2623		/**
2624	<	* Returns the result of accumulating the given transformation
3721	<	* of all (key, value) pairs using the given reducer to
3722	<	* combine values, and the given basis as an identity value.
3723	<	*
3724	<	* @param transformer a function returning the transformation
3725	<	* for an element
3726	<	* @param basis the identity (initial default value) for the reduction
3727	<	* @param reducer a commutative associative combining function
3728	<	* @return the result of accumulating the given transformation
3729	<	* of all (key, value) pairs
2624	>	* Releases write lock for tree restructuring.
2625		*/
2626	<	public double reduceToDouble(ObjectByObjectToDouble<? super K, ? super V> transformer,
2627	<	double basis,
3733	<	DoubleByDoubleToDouble reducer) {
3734	<	return fjp.invoke(ForkJoinTasks.reduceToDouble
3735	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
2626	>	private final void unlockRoot() {
2627	>	lockState = 0;
2628		}
2629
2630		/**
2631	<	* Returns the result of accumulating the given transformation
3740	<	* of all (key, value) pairs using the given reducer to
3741	<	* combine values, and the given basis as an identity value.
3742	<	*
3743	<	* @param transformer a function returning the transformation
3744	<	* for an element
3745	<	* @param basis the identity (initial default value) for the reduction
3746	<	* @param reducer a commutative associative combining function
3747	<	* @return the result of accumulating the given transformation
3748	<	* of all (key, value) pairs
2631	>	* Possibly blocks awaiting root lock.
2632		*/
2633	<	public long reduceToLong(ObjectByObjectToLong<? super K, ? super V> transformer,
2634	<	long basis,
2635	<	LongByLongToLong reducer) {
2636	<	return fjp.invoke(ForkJoinTasks.reduceToLong
2637	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
2633	>	private final void contendedLock() {
2634	>	boolean waiting = false;
2635	>	for (int s;;) {
2636	>	if (((s = lockState) & WRITER) == 0) {
2637	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, WRITER)) {
2638	>	if (waiting)
2639	>	waiter = null;
2640	>	return;
2641	>	}
2642	>	}
2643	>	else if ((s | WAITER) == 0) {
2644	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, s | WAITER)) {
2645	>	waiting = true;
2646	>	waiter = Thread.currentThread();
2647	>	}
2648	>	}
2649	>	else if (waiting)
2650	>	LockSupport.park(this);
2651	>	}
2652		}
2653
2654		/**
2655	<	* Returns the result of accumulating the given transformation
2656	<	* of all (key, value) pairs using the given reducer to
2657	<	* combine values, and the given basis as an identity value.
3761	<	*
3762	<	* @param transformer a function returning the transformation
3763	<	* for an element
3764	<	* @param basis the identity (initial default value) for the reduction
3765	<	* @param reducer a commutative associative combining function
3766	<	* @return the result of accumulating the given transformation
3767	<	* of all (key, value) pairs
2655	>	* Returns matching node or null if none. Tries to search
2656	>	* using tree comparisons from root, but continues linear
2657	>	* search when lock not available.
2658		*/
2659	<	public int reduceToInt(ObjectByObjectToInt<? super K, ? super V> transformer,
2660	<	int basis,
2661	<	IntByIntToInt reducer) {
2662	<	return fjp.invoke(ForkJoinTasks.reduceToInt
2663	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
2659	>	final Node<K,V> find(int h, Object k) {
2660	>	if (k != null) {
2661	>	for (Node<K,V> e = first; e != null; e = e.next) {
2662	>	int s; K ek;
2663	>	if (((s = lockState) & (WAITER|WRITER)) != 0) {
2664	>	if (e.hash == h &&
2665	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2666	>	return e;
2667	>	}
2668	>	else if (U.compareAndSwapInt(this, LOCKSTATE, s,
2669	>	s + READER)) {
2670	>	TreeNode<K,V> r, p;
2671	>	try {
2672	>	p = ((r = root) == null ? null :
2673	>	r.findTreeNode(h, k, null));
2674	>	} finally {
2675	>	Thread w;
2676	>	int ls;
2677	>	do {} while (!U.compareAndSwapInt
2678	>	(this, LOCKSTATE,
2679	>	ls = lockState, ls - READER));
2680	>	if (ls == (READER|WAITER) && (w = waiter) != null)
2681	>	LockSupport.unpark(w);
2682	>	}
2683	>	return p;
2684	>	}
2685	>	}
2686	>	}
2687	>	return null;
2688		}
2689
2690		/**
2691	<	* Performs the given action for each key.
2692	<	*
3779	<	* @param action the action
2691	>	* Finds or adds a node.
2692	>	* @return null if added
2693		*/
2694	<	public void forEachKey(Action<K> action) {
2695	<	fjp.invoke(ForkJoinTasks.forEachKey
2696	<	(ConcurrentHashMapV8.this, action));
2694	>	final TreeNode<K,V> putTreeVal(int h, K k, V v) {
2695	>	Class<?> kc = null;
2696	>	for (TreeNode<K,V> p = root;;) {
2697	>	int dir, ph; K pk; TreeNode<K,V> q, pr;
2698	>	if (p == null) {
2699	>	first = root = new TreeNode<K,V>(h, k, v, null, null);
2700	>	break;
2701	>	}
2702	>	else if ((ph = p.hash) > h)
2703	>	dir = -1;
2704	>	else if (ph < h)
2705	>	dir = 1;
2706	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2707	>	return p;
2708	>	else if ((kc == null &&
2709	>	(kc = comparableClassFor(k)) == null) ||
2710	>	(dir = compareComparables(kc, k, pk)) == 0) {
2711	>	if (p.left == null)
2712	>	dir = 1;
2713	>	else if ((pr = p.right) == null ||
2714	>	(q = pr.findTreeNode(h, k, kc)) == null)
2715	>	dir = -1;
2716	>	else
2717	>	return q;
2718	>	}
2719	>	TreeNode<K,V> xp = p;
2720	>	if ((p = (dir < 0) ? p.left : p.right) == null) {
2721	>	TreeNode<K,V> x, f = first;
2722	>	first = x = new TreeNode<K,V>(h, k, v, f, xp);
2723	>	if (f != null)
2724	>	f.prev = x;
2725	>	if (dir < 0)
2726	>	xp.left = x;
2727	>	else
2728	>	xp.right = x;
2729	>	if (!xp.red)
2730	>	x.red = true;
2731	>	else {
2732	>	lockRoot();
2733	>	try {
2734	>	root = balanceInsertion(root, x);
2735	>	} finally {
2736	>	unlockRoot();
2737	>	}
2738	>	}
2739	>	break;
2740	>	}
2741	>	}
2742	>	assert checkInvariants(root);
2743	>	return null;
2744		}
2745
2746		/**
2747	<	* Performs the given action for each non-null transformation
2748	<	* of each key.
2747	>	* Removes the given node, that must be present before this
2748	>	* call.  This is messier than typical red-black deletion code
2749	>	* because we cannot swap the contents of an interior node
2750	>	* with a leaf successor that is pinned by "next" pointers
2751	>	* that are accessible independently of lock. So instead we
2752	>	* swap the tree linkages.
2753		*
2754	<	* @param transformer a function returning the transformation
3791	<	* for an element, or null of there is no transformation (in
3792	<	* which case the action is not applied)
3793	<	* @param action the action
2754	>	* @return true if now too small, so should be untreeified
2755		*/
2756	<	public <U> void forEachKey(Fun<? super K, ? extends U> transformer,
2757	<	Action<U> action) {
2758	<	fjp.invoke(ForkJoinTasks.forEachKey
2759	<	(ConcurrentHashMapV8.this, transformer, action));
2756	>	final boolean removeTreeNode(TreeNode<K,V> p) {
2757	>	TreeNode<K,V> next = (TreeNode<K,V>)p.next;
2758	>	TreeNode<K,V> pred = p.prev;  // unlink traversal pointers
2759	>	TreeNode<K,V> r, rl;
2760	>	if (pred == null)
2761	>	first = next;
2762	>	else
2763	>	pred.next = next;
2764	>	if (next != null)
2765	>	next.prev = pred;
2766	>	if (first == null) {
2767	>	root = null;
2768	>	return true;
2769	>	}
2770	>	if ((r = root) == null || r.right == null || // too small
2771	>	(rl = r.left) == null || rl.left == null)
2772	>	return true;
2773	>	lockRoot();
2774	>	try {
2775	>	TreeNode<K,V> replacement;
2776	>	TreeNode<K,V> pl = p.left;
2777	>	TreeNode<K,V> pr = p.right;
2778	>	if (pl != null && pr != null) {
2779	>	TreeNode<K,V> s = pr, sl;
2780	>	while ((sl = s.left) != null) // find successor
2781	>	s = sl;
2782	>	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
2783	>	TreeNode<K,V> sr = s.right;
2784	>	TreeNode<K,V> pp = p.parent;
2785	>	if (s == pr) { // p was s's direct parent
2786	>	p.parent = s;
2787	>	s.right = p;
2788	>	}
2789	>	else {
2790	>	TreeNode<K,V> sp = s.parent;
2791	>	if ((p.parent = sp) != null) {
2792	>	if (s == sp.left)
2793	>	sp.left = p;
2794	>	else
2795	>	sp.right = p;
2796	>	}
2797	>	if ((s.right = pr) != null)
2798	>	pr.parent = s;
2799	>	}
2800	>	p.left = null;
2801	>	if ((p.right = sr) != null)
2802	>	sr.parent = p;
2803	>	if ((s.left = pl) != null)
2804	>	pl.parent = s;
2805	>	if ((s.parent = pp) == null)
2806	>	r = s;
2807	>	else if (p == pp.left)
2808	>	pp.left = s;
2809	>	else
2810	>	pp.right = s;
2811	>	if (sr != null)
2812	>	replacement = sr;
2813	>	else
2814	>	replacement = p;
2815	>	}
2816	>	else if (pl != null)
2817	>	replacement = pl;
2818	>	else if (pr != null)
2819	>	replacement = pr;
2820	>	else
2821	>	replacement = p;
2822	>	if (replacement != p) {
2823	>	TreeNode<K,V> pp = replacement.parent = p.parent;
2824	>	if (pp == null)
2825	>	r = replacement;
2826	>	else if (p == pp.left)
2827	>	pp.left = replacement;
2828	>	else
2829	>	pp.right = replacement;
2830	>	p.left = p.right = p.parent = null;
2831	>	}
2832	>
2833	>	root = (p.red) ? r : balanceDeletion(r, replacement);
2834	>
2835	>	if (p == replacement) {  // detach pointers
2836	>	TreeNode<K,V> pp;
2837	>	if ((pp = p.parent) != null) {
2838	>	if (p == pp.left)
2839	>	pp.left = null;
2840	>	else if (p == pp.right)
2841	>	pp.right = null;
2842	>	p.parent = null;
2843	>	}
2844	>	}
2845	>	} finally {
2846	>	unlockRoot();
2847	>	}
2848	>	assert checkInvariants(root);
2849	>	return false;
2850		}
2851
2852	<	/**
2853	<	* Returns a non-null result from applying the given search
2854	<	* function on each key, or null if none. Upon success,
2855	<	* further element processing is suppressed and the results of
2856	<	* any other parallel invocations of the search function are
2857	<	* ignored.
2858	<	*
2859	<	* @param searchFunction a function returning a non-null
2860	<	* result on success, else null
2861	<	* @return a non-null result from applying the given search
2862	<	* function on each key, or null if none
2863	<	*/
2864	<	public <U> U searchKeys(Fun<? super K, ? extends U> searchFunction) {
2865	<	return fjp.invoke(ForkJoinTasks.searchKeys
2866	<	(ConcurrentHashMapV8.this, searchFunction));
2852	>	/* ------------------------------------------------------------ */
2853	>	// Red-black tree methods, all adapted from CLR
2854	>
2855	>	static <K,V> TreeNode<K,V> rotateLeft(TreeNode<K,V> root,
2856	>	TreeNode<K,V> p) {
2857	>	TreeNode<K,V> r, pp, rl;
2858	>	if (p != null && (r = p.right) != null) {
2859	>	if ((rl = p.right = r.left) != null)
2860	>	rl.parent = p;
2861	>	if ((pp = r.parent = p.parent) == null)
2862	>	(root = r).red = false;
2863	>	else if (pp.left == p)
2864	>	pp.left = r;
2865	>	else
2866	>	pp.right = r;
2867	>	r.left = p;
2868	>	p.parent = r;
2869	>	}
2870	>	return root;
2871		}
2872
2873	<	/**
2874	<	* Returns the result of accumulating all keys using the given
2875	<	* reducer to combine values, or null if none.
2876	<	*
2877	<	* @param reducer a commutative associative combining function
2878	<	* @return the result of accumulating all keys using the given
2879	<	* reducer to combine values, or null if none
2880	<	*/
2881	<	public K reduceKeys(BiFun<? super K, ? super K, ? extends K> reducer) {
2882	<	return fjp.invoke(ForkJoinTasks.reduceKeys
2883	<	(ConcurrentHashMapV8.this, reducer));
2873	>	static <K,V> TreeNode<K,V> rotateRight(TreeNode<K,V> root,
2874	>	TreeNode<K,V> p) {
2875	>	TreeNode<K,V> l, pp, lr;
2876	>	if (p != null && (l = p.left) != null) {
2877	>	if ((lr = p.left = l.right) != null)
2878	>	lr.parent = p;
2879	>	if ((pp = l.parent = p.parent) == null)
2880	>	(root = l).red = false;
2881	>	else if (pp.right == p)
2882	>	pp.right = l;
2883	>	else
2884	>	pp.left = l;
2885	>	l.right = p;
2886	>	p.parent = l;
2887	>	}
2888	>	return root;
2889		}
2890
2891	<	/**
2892	<	* Returns the result of accumulating the given transformation
2893	<	* of all keys using the given reducer to combine values, or
2894	<	* null if none.
2895	<	*
2896	<	* @param transformer a function returning the transformation
2897	<	* for an element, or null of there is no transformation (in
2898	<	* which case it is not combined)
2899	<	* @param reducer a commutative associative combining function
2900	<	* @return the result of accumulating the given transformation
2901	<	* of all keys
2902	<	*/
2903	<	public <U> U reduceKeys(Fun<? super K, ? extends U> transformer,
2904	<	BiFun<? super U, ? super U, ? extends U> reducer) {
2905	<	return fjp.invoke(ForkJoinTasks.reduceKeys
2906	<	(ConcurrentHashMapV8.this, transformer, reducer));
2891	>	static <K,V> TreeNode<K,V> balanceInsertion(TreeNode<K,V> root,
2892	>	TreeNode<K,V> x) {
2893	>	x.red = true;
2894	>	for (TreeNode<K,V> xp, xpp, xppl, xppr;;) {
2895	>	if ((xp = x.parent) == null) {
2896	>	x.red = false;
2897	>	return x;
2898	>	}
2899	>	else if (!xp.red || (xpp = xp.parent) == null)
2900	>	return root;
2901	>	if (xp == (xppl = xpp.left)) {
2902	>	if ((xppr = xpp.right) != null && xppr.red) {
2903	>	xppr.red = false;
2904	>	xp.red = false;
2905	>	xpp.red = true;
2906	>	x = xpp;
2907	>	}
2908	>	else {
2909	>	if (x == xp.right) {
2910	>	root = rotateLeft(root, x = xp);
2911	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2912	>	}
2913	>	if (xp != null) {
2914	>	xp.red = false;
2915	>	if (xpp != null) {
2916	>	xpp.red = true;
2917	>	root = rotateRight(root, xpp);
2918	>	}
2919	>	}
2920	>	}
2921	>	}
2922	>	else {
2923	>	if (xppl != null && xppl.red) {
2924	>	xppl.red = false;
2925	>	xp.red = false;
2926	>	xpp.red = true;
2927	>	x = xpp;
2928	>	}
2929	>	else {
2930	>	if (x == xp.left) {
2931	>	root = rotateRight(root, x = xp);
2932	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2933	>	}
2934	>	if (xp != null) {
2935	>	xp.red = false;
2936	>	if (xpp != null) {
2937	>	xpp.red = true;
2938	>	root = rotateLeft(root, xpp);
2939	>	}
2940	>	}
2941	>	}
2942	>	}
2943	>	}
2944		}
2945
2946	<	/**
2947	<	* Returns the result of accumulating the given transformation
2948	<	* of all keys using the given reducer to combine values, and
2949	<	* the given basis as an identity value.
2950	<	*
2951	<	* @param transformer a function returning the transformation
2952	<	* for an element
2953	<	* @param basis the identity (initial default value) for the reduction
2954	<	* @param reducer a commutative associative combining function
2955	<	* @return  the result of accumulating the given transformation
2956	<	* of all keys
2957	<	*/
2958	<	public double reduceKeysToDouble(ObjectToDouble<? super K> transformer,
2959	<	double basis,
2960	<	DoubleByDoubleToDouble reducer) {
2961	<	return fjp.invoke(ForkJoinTasks.reduceKeysToDouble
2962	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
2946	>	static <K,V> TreeNode<K,V> balanceDeletion(TreeNode<K,V> root,
2947	>	TreeNode<K,V> x) {
2948	>	for (TreeNode<K,V> xp, xpl, xpr;;)  {
2949	>	if (x == null || x == root)
2950	>	return root;
2951	>	else if ((xp = x.parent) == null) {
2952	>	x.red = false;
2953	>	return x;
2954	>	}
2955	>	else if (x.red) {
2956	>	x.red = false;
2957	>	return root;
2958	>	}
2959	>	else if ((xpl = xp.left) == x) {
2960	>	if ((xpr = xp.right) != null && xpr.red) {
2961	>	xpr.red = false;
2962	>	xp.red = true;
2963	>	root = rotateLeft(root, xp);
2964	>	xpr = (xp = x.parent) == null ? null : xp.right;
2965	>	}
2966	>	if (xpr == null)
2967	>	x = xp;
2968	>	else {
2969	>	TreeNode<K,V> sl = xpr.left, sr = xpr.right;
2970	>	if ((sr == null || !sr.red) &&
2971	>	(sl == null || !sl.red)) {
2972	>	xpr.red = true;
2973	>	x = xp;
2974	>	}
2975	>	else {
2976	>	if (sr == null || !sr.red) {
2977	>	if (sl != null)
2978	>	sl.red = false;
2979	>	xpr.red = true;
2980	>	root = rotateRight(root, xpr);
2981	>	xpr = (xp = x.parent) == null ?
2982	>	null : xp.right;
2983	>	}
2984	>	if (xpr != null) {
2985	>	xpr.red = (xp == null) ? false : xp.red;
2986	>	if ((sr = xpr.right) != null)
2987	>	sr.red = false;
2988	>	}
2989	>	if (xp != null) {
2990	>	xp.red = false;
2991	>	root = rotateLeft(root, xp);
2992	>	}
2993	>	x = root;
2994	>	}
2995	>	}
2996	>	}
2997	>	else { // symmetric
2998	>	if (xpl != null && xpl.red) {
2999	>	xpl.red = false;
3000	>	xp.red = true;
3001	>	root = rotateRight(root, xp);
3002	>	xpl = (xp = x.parent) == null ? null : xp.left;
3003	>	}
3004	>	if (xpl == null)
3005	>	x = xp;
3006	>	else {
3007	>	TreeNode<K,V> sl = xpl.left, sr = xpl.right;
3008	>	if ((sl == null || !sl.red) &&
3009	>	(sr == null || !sr.red)) {
3010	>	xpl.red = true;
3011	>	x = xp;
3012	>	}
3013	>	else {
3014	>	if (sl == null || !sl.red) {
3015	>	if (sr != null)
3016	>	sr.red = false;
3017	>	xpl.red = true;
3018	>	root = rotateLeft(root, xpl);
3019	>	xpl = (xp = x.parent) == null ?
3020	>	null : xp.left;
3021	>	}
3022	>	if (xpl != null) {
3023	>	xpl.red = (xp == null) ? false : xp.red;
3024	>	if ((sl = xpl.left) != null)
3025	>	sl.red = false;
3026	>	}
3027	>	if (xp != null) {
3028	>	xp.red = false;
3029	>	root = rotateRight(root, xp);
3030	>	}
3031	>	x = root;
3032	>	}
3033	>	}
3034	>	}
3035	>	}
3036		}
3037
3038		/**
3039	<	* Returns the result of accumulating the given transformation
3870	<	* of all keys using the given reducer to combine values, and
3871	<	* the given basis as an identity value.
3872	<	*
3873	<	* @param transformer a function returning the transformation
3874	<	* for an element
3875	<	* @param basis the identity (initial default value) for the reduction
3876	<	* @param reducer a commutative associative combining function
3877	<	* @return the result of accumulating the given transformation
3878	<	* of all keys
3039	>	* Recursive invariant check
3040		*/
3041	<	public long reduceKeysToLong(ObjectToLong<? super K> transformer,
3042	<	long basis,
3043	<	LongByLongToLong reducer) {
3044	<	return fjp.invoke(ForkJoinTasks.reduceKeysToLong
3045	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3041	>	static <K,V> boolean checkInvariants(TreeNode<K,V> t) {
3042	>	TreeNode<K,V> tp = t.parent, tl = t.left, tr = t.right,
3043	>	tb = t.prev, tn = (TreeNode<K,V>)t.next;
3044	>	if (tb != null && tb.next != t)
3045	>	return false;
3046	>	if (tn != null && tn.prev != t)
3047	>	return false;
3048	>	if (tp != null && t != tp.left && t != tp.right)
3049	>	return false;
3050	>	if (tl != null && (tl.parent != t || tl.hash > t.hash))
3051	>	return false;
3052	>	if (tr != null && (tr.parent != t || tr.hash < t.hash))
3053	>	return false;
3054	>	if (t.red && tl != null && tl.red && tr != null && tr.red)
3055	>	return false;
3056	>	if (tl != null && !checkInvariants(tl))
3057	>	return false;
3058	>	if (tr != null && !checkInvariants(tr))
3059	>	return false;
3060	>	return true;
3061		}
3062
3063	<	/**
3064	<	* Returns the result of accumulating the given transformation
3065	<	* of all keys using the given reducer to combine values, and
3066	<	* the given basis as an identity value.
3067	<	*
3068	<	* @param transformer a function returning the transformation
3069	<	* for an element
3070	<	* @param basis the identity (initial default value) for the reduction
3071	<	* @param reducer a commutative associative combining function
3072	<	* @return the result of accumulating the given transformation
3073	<	* of all keys
3898	<	*/
3899	<	public int reduceKeysToInt(ObjectToInt<? super K> transformer,
3900	<	int basis,
3901	<	IntByIntToInt reducer) {
3902	<	return fjp.invoke(ForkJoinTasks.reduceKeysToInt
3903	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3063	>	private static final sun.misc.Unsafe U;
3064	>	private static final long LOCKSTATE;
3065	>	static {
3066	>	try {
3067	>	U = getUnsafe();
3068	>	Class<?> k = TreeBin.class;
3069	>	LOCKSTATE = U.objectFieldOffset
3070	>	(k.getDeclaredField("lockState"));
3071	>	} catch (Exception e) {
3072	>	throw new Error(e);
3073	>	}
3074		}
3075	+	}
3076
3077	<	/**
3078	<	* Performs the given action for each value.
3079	<	*
3080	<	* @param action the action
3081	<	*/
3082	<	public void forEachValue(Action<V> action) {
3083	<	fjp.invoke(ForkJoinTasks.forEachValue
3084	<	(ConcurrentHashMapV8.this, action));
3077	>	/* ----------------Table Traversal -------------- */
3078	>
3079	>	/**
3080	>	* Encapsulates traversal for methods such as containsValue; also
3081	>	* serves as a base class for other iterators and spliterators.
3082	>	*
3083	>	* Method advance visits once each still-valid node that was
3084	>	* reachable upon iterator construction. It might miss some that
3085	>	* were added to a bin after the bin was visited, which is OK wrt
3086	>	* consistency guarantees. Maintaining this property in the face
3087	>	* of possible ongoing resizes requires a fair amount of
3088	>	* bookkeeping state that is difficult to optimize away amidst
3089	>	* volatile accesses.  Even so, traversal maintains reasonable
3090	>	* throughput.
3091	>	*
3092	>	* Normally, iteration proceeds bin-by-bin traversing lists.
3093	>	* However, if the table has been resized, then all future steps
3094	>	* must traverse both the bin at the current index as well as at
3095	>	* (index + baseSize); and so on for further resizings. To
3096	>	* paranoically cope with potential sharing by users of iterators
3097	>	* across threads, iteration terminates if a bounds checks fails
3098	>	* for a table read.
3099	>	*/
3100	>	static class Traverser<K,V> {
3101	>	Node<K,V>[] tab;        // current table; updated if resized
3102	>	Node<K,V> next;         // the next entry to use
3103	>	int index;              // index of bin to use next
3104	>	int baseIndex;          // current index of initial table
3105	>	int baseLimit;          // index bound for initial table
3106	>	final int baseSize;     // initial table size
3107	>
3108	>	Traverser(Node<K,V>[] tab, int size, int index, int limit) {
3109	>	this.tab = tab;
3110	>	this.baseSize = size;
3111	>	this.baseIndex = this.index = index;
3112	>	this.baseLimit = limit;
3113	>	this.next = null;
3114		}
3115
3116		/**
3117	<	* Performs the given action for each non-null transformation
3118	<	* of each value.
3119	<	*
3120	<	* @param transformer a function returning the transformation
3121	<	* for an element, or null of there is no transformation (in
3122	<	* which case the action is not applied)
3123	<	*/
3124	<	public <U> void forEachValue(Fun<? super V, ? extends U> transformer,
3125	<	Action<U> action) {
3126	<	fjp.invoke(ForkJoinTasks.forEachValue
3127	<	(ConcurrentHashMapV8.this, transformer, action));
3117	>	* Advances if possible, returning next valid node, or null if none.
3118	>	*/
3119	>	final Node<K,V> advance() {
3120	>	Node<K,V> e;
3121	>	if ((e = next) != null)
3122	>	e = e.next;
3123	>	for (;;) {
3124	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
3125	>	if (e != null)
3126	>	return next = e;
3127	>	if (baseIndex >= baseLimit || (t = tab) == null ||
3128	>	(n = t.length) <= (i = index) || i < 0)
3129	>	return next = null;
3130	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
3131	>	if (e instanceof ForwardingNode) {
3132	>	tab = ((ForwardingNode<K,V>)e).nextTable;
3133	>	e = null;
3134	>	continue;
3135	>	}
3136	>	else if (e instanceof TreeBin)
3137	>	e = ((TreeBin<K,V>)e).first;
3138	>	else
3139	>	e = null;
3140	>	}
3141	>	if ((index += baseSize) >= n)
3142	>	index = ++baseIndex;    // visit upper slots if present
3143	>	}
3144		}
3145	+	}
3146
3147	<	/**
3148	<	* Returns a non-null result from applying the given search
3149	<	* function on each value, or null if none.  Upon success,
3150	<	* further element processing is suppressed and the results of
3151	<	* any other parallel invocations of the search function are
3152	<	* ignored.
3153	<	*
3154	<	* @param searchFunction a function returning a non-null
3155	<	* result on success, else null
3156	<	* @return a non-null result from applying the given search
3157	<	* function on each value, or null if none
3158	<	*
3942	<	*/
3943	<	public <U> U searchValues(Fun<? super V, ? extends U> searchFunction) {
3944	<	return fjp.invoke(ForkJoinTasks.searchValues
3945	<	(ConcurrentHashMapV8.this, searchFunction));
3147	>	/**
3148	>	* Base of key, value, and entry Iterators. Adds fields to
3149	>	* Traverser to support iterator.remove.
3150	>	*/
3151	>	static class BaseIterator<K,V> extends Traverser<K,V> {
3152	>	final ConcurrentHashMapV8<K,V> map;
3153	>	Node<K,V> lastReturned;
3154	>	BaseIterator(Node<K,V>[] tab, int size, int index, int limit,
3155	>	ConcurrentHashMapV8<K,V> map) {
3156	>	super(tab, size, index, limit);
3157	>	this.map = map;
3158	>	advance();
3159		}
3160
3161	<	/**
3162	<	* Returns the result of accumulating all values using the
3163	<	* given reducer to combine values, or null if none.
3164	<	*
3165	<	* @param reducer a commutative associative combining function
3166	<	* @return  the result of accumulating all values
3167	<	*/
3168	<	public V reduceValues(BiFun<? super V, ? super V, ? extends V> reducer) {
3169	<	return fjp.invoke(ForkJoinTasks.reduceValues
3957	<	(ConcurrentHashMapV8.this, reducer));
3161	>	public final boolean hasNext() { return next != null; }
3162	>	public final boolean hasMoreElements() { return next != null; }
3163	>
3164	>	public final void remove() {
3165	>	Node<K,V> p;
3166	>	if ((p = lastReturned) == null)
3167	>	throw new IllegalStateException();
3168	>	lastReturned = null;
3169	>	map.replaceNode(p.key, null, null);
3170		}
3171	+	}
3172
3173	<	/**
3174	<	* Returns the result of accumulating the given transformation
3175	<	* of all values using the given reducer to combine values, or
3176	<	* null if none.
3177	<	*
3965	<	* @param transformer a function returning the transformation
3966	<	* for an element, or null of there is no transformation (in
3967	<	* which case it is not combined)
3968	<	* @param reducer a commutative associative combining function
3969	<	* @return the result of accumulating the given transformation
3970	<	* of all values
3971	<	*/
3972	<	public <U> U reduceValues(Fun<? super V, ? extends U> transformer,
3973	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3974	<	return fjp.invoke(ForkJoinTasks.reduceValues
3975	<	(ConcurrentHashMapV8.this, transformer, reducer));
3173	>	static final class KeyIterator<K,V> extends BaseIterator<K,V>
3174	>	implements Iterator<K>, Enumeration<K> {
3175	>	KeyIterator(Node<K,V>[] tab, int index, int size, int limit,
3176	>	ConcurrentHashMapV8<K,V> map) {
3177	>	super(tab, index, size, limit, map);
3178		}
3179
3180	<	/**
3181	<	* Returns the result of accumulating the given transformation
3182	<	* of all values using the given reducer to combine values,
3183	<	* and the given basis as an identity value.
3184	<	*
3185	<	* @param transformer a function returning the transformation
3186	<	* for an element
3187	<	* @param basis the identity (initial default value) for the reduction
3986	<	* @param reducer a commutative associative combining function
3987	<	* @return the result of accumulating the given transformation
3988	<	* of all values
3989	<	*/
3990	<	public double reduceValuesToDouble(ObjectToDouble<? super V> transformer,
3991	<	double basis,
3992	<	DoubleByDoubleToDouble reducer) {
3993	<	return fjp.invoke(ForkJoinTasks.reduceValuesToDouble
3994	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3180	>	public final K next() {
3181	>	Node<K,V> p;
3182	>	if ((p = next) == null)
3183	>	throw new NoSuchElementException();
3184	>	K k = p.key;
3185	>	lastReturned = p;
3186	>	advance();
3187	>	return k;
3188		}
3189
3190	<	/**
3191	<	* Returns the result of accumulating the given transformation
3192	<	* of all values using the given reducer to combine values,
3193	<	* and the given basis as an identity value.
3194	<	*
3195	<	* @param transformer a function returning the transformation
3196	<	* for an element
3197	<	* @param basis the identity (initial default value) for the reduction
4005	<	* @param reducer a commutative associative combining function
4006	<	* @return the result of accumulating the given transformation
4007	<	* of all values
4008	<	*/
4009	<	public long reduceValuesToLong(ObjectToLong<? super V> transformer,
4010	<	long basis,
4011	<	LongByLongToLong reducer) {
4012	<	return fjp.invoke(ForkJoinTasks.reduceValuesToLong
4013	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3190	>	public final K nextElement() { return next(); }
3191	>	}
3192	>
3193	>	static final class ValueIterator<K,V> extends BaseIterator<K,V>
3194	>	implements Iterator<V>, Enumeration<V> {
3195	>	ValueIterator(Node<K,V>[] tab, int index, int size, int limit,
3196	>	ConcurrentHashMapV8<K,V> map) {
3197	>	super(tab, index, size, limit, map);
3198		}
3199
3200	<	/**
3201	<	* Returns the result of accumulating the given transformation
3202	<	* of all values using the given reducer to combine values,
3203	<	* and the given basis as an identity value.
3204	<	*
3205	<	* @param transformer a function returning the transformation
3206	<	* for an element
3207	<	* @param basis the identity (initial default value) for the reduction
4024	<	* @param reducer a commutative associative combining function
4025	<	* @return the result of accumulating the given transformation
4026	<	* of all values
4027	<	*/
4028	<	public int reduceValuesToInt(ObjectToInt<? super V> transformer,
4029	<	int basis,
4030	<	IntByIntToInt reducer) {
4031	<	return fjp.invoke(ForkJoinTasks.reduceValuesToInt
4032	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3200	>	public final V next() {
3201	>	Node<K,V> p;
3202	>	if ((p = next) == null)
3203	>	throw new NoSuchElementException();
3204	>	V v = p.val;
3205	>	lastReturned = p;
3206	>	advance();
3207	>	return v;
3208		}
3209
3210	<	/**
3211	<	* Performs the given action for each entry.
3212	<	*
3213	<	* @param action the action
3214	<	*/
3215	<	public void forEachEntry(Action<Map.Entry<K,V>> action) {
3216	<	fjp.invoke(ForkJoinTasks.forEachEntry
3217	<	(ConcurrentHashMapV8.this, action));
3210	>	public final V nextElement() { return next(); }
3211	>	}
3212	>
3213	>	static final class EntryIterator<K,V> extends BaseIterator<K,V>
3214	>	implements Iterator<Map.Entry<K,V>> {
3215	>	EntryIterator(Node<K,V>[] tab, int index, int size, int limit,
3216	>	ConcurrentHashMapV8<K,V> map) {
3217	>	super(tab, index, size, limit, map);
3218		}
3219
3220	<	/**
3221	<	* Performs the given action for each non-null transformation
3222	<	* of each entry.
3223	<	*
3224	<	* @param transformer a function returning the transformation
3225	<	* for an element, or null of there is no transformation (in
3226	<	* which case the action is not applied)
3227	<	* @param action the action
3228	<	*/
4054	<	public <U> void forEachEntry(Fun<Map.Entry<K,V>, ? extends U> transformer,
4055	<	Action<U> action) {
4056	<	fjp.invoke(ForkJoinTasks.forEachEntry
4057	<	(ConcurrentHashMapV8.this, transformer, action));
3220	>	public final Map.Entry<K,V> next() {
3221	>	Node<K,V> p;
3222	>	if ((p = next) == null)
3223	>	throw new NoSuchElementException();
3224	>	K k = p.key;
3225	>	V v = p.val;
3226	>	lastReturned = p;
3227	>	advance();
3228	>	return new MapEntry<K,V>(k, v, map);
3229		}
3230	+	}
3231
3232	<	/**
3233	<	* Returns a non-null result from applying the given search
3234	<	* function on each entry, or null if none.  Upon success,
3235	<	* further element processing is suppressed and the results of
3236	<	* any other parallel invocations of the search function are
3237	<	* ignored.
3238	<	*
3239	<	* @param searchFunction a function returning a non-null
3240	<	* result on success, else null
3241	<	* @return a non-null result from applying the given search
3242	<	* function on each entry, or null if none
4071	<	*/
4072	<	public <U> U searchEntries(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4073	<	return fjp.invoke(ForkJoinTasks.searchEntries
4074	<	(ConcurrentHashMapV8.this, searchFunction));
3232	>	/**
3233	>	* Exported Entry for EntryIterator
3234	>	*/
3235	>	static final class MapEntry<K,V> implements Map.Entry<K,V> {
3236	>	final K key; // non-null
3237	>	V val;       // non-null
3238	>	final ConcurrentHashMapV8<K,V> map;
3239	>	MapEntry(K key, V val, ConcurrentHashMapV8<K,V> map) {
3240	>	this.key = key;
3241	>	this.val = val;
3242	>	this.map = map;
3243		}
3244	+	public K getKey()        { return key; }
3245	+	public V getValue()      { return val; }
3246	+	public int hashCode()    { return key.hashCode() ^ val.hashCode(); }
3247	+	public String toString() { return key + "=" + val; }
3248
3249	<	/**
3250	<	* Returns the result of accumulating all entries using the
3251	<	* given reducer to combine values, or null if none.
3252	<	*
3253	<	* @param reducer a commutative associative combining function
3254	<	* @return the result of accumulating all entries
3255	<	*/
4084	<	public Map.Entry<K,V> reduceEntries(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4085	<	return fjp.invoke(ForkJoinTasks.reduceEntries
4086	<	(ConcurrentHashMapV8.this, reducer));
3249	>	public boolean equals(Object o) {
3250	>	Object k, v; Map.Entry<?,?> e;
3251	>	return ((o instanceof Map.Entry) &&
3252	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
3253	>	(v = e.getValue()) != null &&
3254	>	(k == key || k.equals(key)) &&
3255	>	(v == val || v.equals(val)));
3256		}
3257
3258		/**
3259	<	* Returns the result of accumulating the given transformation
3260	<	* of all entries using the given reducer to combine values,
3261	<	* or null if none.
3262	<	*
3263	<	* @param transformer a function returning the transformation
3264	<	* for an element, or null of there is no transformation (in
4096	<	* which case it is not combined).
4097	<	* @param reducer a commutative associative combining function
4098	<	* @return the result of accumulating the given transformation
4099	<	* of all entries
3259	>	* Sets our entry's value and writes through to the map. The
3260	>	* value to return is somewhat arbitrary here. Since we do not
3261	>	* necessarily track asynchronous changes, the most recent
3262	>	* "previous" value could be different from what we return (or
3263	>	* could even have been removed, in which case the put will
3264	>	* re-establish). We do not and cannot guarantee more.
3265		*/
3266	<	public <U> U reduceEntries(Fun<Map.Entry<K,V>, ? extends U> transformer,
3267	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3268	<	return fjp.invoke(ForkJoinTasks.reduceEntries
3269	<	(ConcurrentHashMapV8.this, transformer, reducer));
3266	>	public V setValue(V value) {
3267	>	if (value == null) throw new NullPointerException();
3268	>	V v = val;
3269	>	val = value;
3270	>	map.put(key, value);
3271	>	return v;
3272		}
3273	+	}
3274
3275	<	/**
3276	<	* Returns the result of accumulating the given transformation
3277	<	* of all entries using the given reducer to combine values,
3278	<	* and the given basis as an identity value.
3279	<	*
3280	<	* @param transformer a function returning the transformation
3281	<	* for an element
3282	<	* @param basis the identity (initial default value) for the reduction
3283	<	* @param reducer a commutative associative combining function
3284	<	* @return the result of accumulating the given transformation
3285	<	* of all entries
3286	<	*/
3287	<	public double reduceEntriesToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
3288	<	double basis,
4121	<	DoubleByDoubleToDouble reducer) {
4122	<	return fjp.invoke(ForkJoinTasks.reduceEntriesToDouble
4123	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3275	>	static final class KeySpliterator<K,V> extends Traverser<K,V>
3276	>	implements ConcurrentHashMapSpliterator<K> {
3277	>	long est;               // size estimate
3278	>	KeySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3279	>	long est) {
3280	>	super(tab, size, index, limit);
3281	>	this.est = est;
3282	>	}
3283	>
3284	>	public ConcurrentHashMapSpliterator<K> trySplit() {
3285	>	int i, f, h;
3286	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3287	>	new KeySpliterator<K,V>(tab, baseSize, baseLimit = h,
3288	>	f, est >>>= 1);
3289		}
3290
3291	<	/**
3292	<	* Returns the result of accumulating the given transformation
3293	<	* of all entries using the given reducer to combine values,
3294	<	* and the given basis as an identity value.
4130	<	*
4131	<	* @param transformer a function returning the transformation
4132	<	* for an element
4133	<	* @param basis the identity (initial default value) for the reduction
4134	<	* @param reducer a commutative associative combining function
4135	<	* @return  the result of accumulating the given transformation
4136	<	* of all entries
4137	<	*/
4138	<	public long reduceEntriesToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4139	<	long basis,
4140	<	LongByLongToLong reducer) {
4141	<	return fjp.invoke(ForkJoinTasks.reduceEntriesToLong
4142	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3291	>	public void forEachRemaining(Action<? super K> action) {
3292	>	if (action == null) throw new NullPointerException();
3293	>	for (Node<K,V> p; (p = advance()) != null;)
3294	>	action.apply(p.key);
3295		}
3296
3297	<	/**
3298	<	* Returns the result of accumulating the given transformation
3299	<	* of all entries using the given reducer to combine values,
3300	<	* and the given basis as an identity value.
3301	<	*
3302	<	* @param transformer a function returning the transformation
3303	<	* for an element
4152	<	* @param basis the identity (initial default value) for the reduction
4153	<	* @param reducer a commutative associative combining function
4154	<	* @return the result of accumulating the given transformation
4155	<	* of all entries
4156	<	*/
4157	<	public int reduceEntriesToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4158	<	int basis,
4159	<	IntByIntToInt reducer) {
4160	<	return fjp.invoke(ForkJoinTasks.reduceEntriesToInt
4161	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3297	>	public boolean tryAdvance(Action<? super K> action) {
3298	>	if (action == null) throw new NullPointerException();
3299	>	Node<K,V> p;
3300	>	if ((p = advance()) == null)
3301	>	return false;
3302	>	action.apply(p.key);
3303	>	return true;
3304		}
3305	+
3306	+	public long estimateSize() { return est; }
3307	+
3308		}
3309
3310	<	// ---------------------------------------------------------------------
3310	>	static final class ValueSpliterator<K,V> extends Traverser<K,V>
3311	>	implements ConcurrentHashMapSpliterator<V> {
3312	>	long est;               // size estimate
3313	>	ValueSpliterator(Node<K,V>[] tab, int size, int index, int limit,
3314	>	long est) {
3315	>	super(tab, size, index, limit);
3316	>	this.est = est;
3317	>	}
3318
3319	<	/**
3320	<	* Predefined tasks for performing bulk parallel operations on
3321	<	* ConcurrentHashMaps. These tasks follow the forms and rules used
3322	<	* in class {@link Parallel}. Each method has the same name, but
3323	<	* returns a task rather than invoking it. These methods may be
3324	<	* useful in custom applications such as submitting a task without
4173	<	* waiting for completion, or combining with other tasks.
4174	<	*/
4175	<	public static class ForkJoinTasks {
4176	<	private ForkJoinTasks() {}
3319	>	public ConcurrentHashMapSpliterator<V> trySplit() {
3320	>	int i, f, h;
3321	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3322	>	new ValueSpliterator<K,V>(tab, baseSize, baseLimit = h,
3323	>	f, est >>>= 1);
3324	>	}
3325
3326	<	/**
4179	<	* Returns a task that when invoked, performs the given
4180	<	* action for each (key, value)
4181	<	*
4182	<	* @param map the map
4183	<	* @param action the action
4184	<	* @return the task
4185	<	*/
4186	<	public static <K,V> ForkJoinTask<Void> forEach
4187	<	(ConcurrentHashMapV8<K,V> map,
4188	<	BiAction<K,V> action) {
3326	>	public void forEachRemaining(Action<? super V> action) {
3327		if (action == null) throw new NullPointerException();
3328	<	return new ForEachMappingTask<K,V>(map, null, -1, action);
3328	>	for (Node<K,V> p; (p = advance()) != null;)
3329	>	action.apply(p.val);
3330		}
3331
3332	<	/**
3333	<	* Returns a task that when invoked, performs the given
3334	<	* action for each non-null transformation of each (key, value)
3335	<	*
3336	<	* @param map the map
3337	<	* @param transformer a function returning the transformation
3338	<	* for an element, or null of there is no transformation (in
4200	<	* which case the action is not applied)
4201	<	* @param action the action
4202	<	* @return the task
4203	<	*/
4204	<	public static <K,V,U> ForkJoinTask<Void> forEach
4205	<	(ConcurrentHashMapV8<K,V> map,
4206	<	BiFun<? super K, ? super V, ? extends U> transformer,
4207	<	Action<U> action) {
4208	<	if (transformer == null || action == null)
4209	<	throw new NullPointerException();
4210	<	return new ForEachTransformedMappingTask<K,V,U>
4211	<	(map, null, -1, transformer, action);
3332	>	public boolean tryAdvance(Action<? super V> action) {
3333	>	if (action == null) throw new NullPointerException();
3334	>	Node<K,V> p;
3335	>	if ((p = advance()) == null)
3336	>	return false;
3337	>	action.apply(p.val);
3338	>	return true;
3339		}
3340
3341	<	/**
3342	<	* Returns a task that when invoked, returns a non-null result
3343	<	* from applying the given search function on each (key,
3344	<	* value), or null if none. Upon success, further element
3345	<	* processing is suppressed and the results of any other
3346	<	* parallel invocations of the search function are ignored.
3347	<	*
3348	<	* @param map the map
3349	<	* @param searchFunction a function returning a non-null
3350	<	* result on success, else null
3351	<	* @return the task
3352	<	*/
3353	<	public static <K,V,U> ForkJoinTask<U> search
4227	<	(ConcurrentHashMapV8<K,V> map,
4228	<	BiFun<? super K, ? super V, ? extends U> searchFunction) {
4229	<	if (searchFunction == null) throw new NullPointerException();
4230	<	return new SearchMappingsTask<K,V,U>
4231	<	(map, null, -1, searchFunction,
4232	<	new AtomicReference<U>());
3341	>	public long estimateSize() { return est; }
3342	>
3343	>	}
3344	>
3345	>	static final class EntrySpliterator<K,V> extends Traverser<K,V>
3346	>	implements ConcurrentHashMapSpliterator<Map.Entry<K,V>> {
3347	>	final ConcurrentHashMapV8<K,V> map; // To export MapEntry
3348	>	long est;               // size estimate
3349	>	EntrySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3350	>	long est, ConcurrentHashMapV8<K,V> map) {
3351	>	super(tab, size, index, limit);
3352	>	this.map = map;
3353	>	this.est = est;
3354		}
3355
3356	<	/**
3357	<	* Returns a task that when invoked, returns the result of
3358	<	* accumulating the given transformation of all (key, value) pairs
3359	<	* using the given reducer to combine values, or null if none.
3360	<	*
4240	<	* @param map the map
4241	<	* @param transformer a function returning the transformation
4242	<	* for an element, or null of there is no transformation (in
4243	<	* which case it is not combined).
4244	<	* @param reducer a commutative associative combining function
4245	<	* @return the task
4246	<	*/
4247	<	public static <K,V,U> ForkJoinTask<U> reduce
4248	<	(ConcurrentHashMapV8<K,V> map,
4249	<	BiFun<? super K, ? super V, ? extends U> transformer,
4250	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4251	<	if (transformer == null || reducer == null)
4252	<	throw new NullPointerException();
4253	<	return new MapReduceMappingsTask<K,V,U>
4254	<	(map, null, -1, null, transformer, reducer);
3356	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> trySplit() {
3357	>	int i, f, h;
3358	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3359	>	new EntrySpliterator<K,V>(tab, baseSize, baseLimit = h,
3360	>	f, est >>>= 1, map);
3361		}
3362
3363	<	/**
3364	<	* Returns a task that when invoked, returns the result of
3365	<	* accumulating the given transformation of all (key, value) pairs
3366	<	* using the given reducer to combine values, and the given
4261	<	* basis as an identity value.
4262	<	*
4263	<	* @param map the map
4264	<	* @param transformer a function returning the transformation
4265	<	* for an element
4266	<	* @param basis the identity (initial default value) for the reduction
4267	<	* @param reducer a commutative associative combining function
4268	<	* @return the task
4269	<	*/
4270	<	public static <K,V> ForkJoinTask<Double> reduceToDouble
4271	<	(ConcurrentHashMapV8<K,V> map,
4272	<	ObjectByObjectToDouble<? super K, ? super V> transformer,
4273	<	double basis,
4274	<	DoubleByDoubleToDouble reducer) {
4275	<	if (transformer == null || reducer == null)
4276	<	throw new NullPointerException();
4277	<	return new MapReduceMappingsToDoubleTask<K,V>
4278	<	(map, null, -1, null, transformer, basis, reducer);
3363	>	public void forEachRemaining(Action<? super Map.Entry<K,V>> action) {
3364	>	if (action == null) throw new NullPointerException();
3365	>	for (Node<K,V> p; (p = advance()) != null; )
3366	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3367		}
3368
3369	<	/**
3370	<	* Returns a task that when invoked, returns the result of
3371	<	* accumulating the given transformation of all (key, value) pairs
3372	<	* using the given reducer to combine values, and the given
3373	<	* basis as an identity value.
3374	<	*
3375	<	* @param map the map
4288	<	* @param transformer a function returning the transformation
4289	<	* for an element
4290	<	* @param basis the identity (initial default value) for the reduction
4291	<	* @param reducer a commutative associative combining function
4292	<	* @return the task
4293	<	*/
4294	<	public static <K,V> ForkJoinTask<Long> reduceToLong
4295	<	(ConcurrentHashMapV8<K,V> map,
4296	<	ObjectByObjectToLong<? super K, ? super V> transformer,
4297	<	long basis,
4298	<	LongByLongToLong reducer) {
4299	<	if (transformer == null || reducer == null)
4300	<	throw new NullPointerException();
4301	<	return new MapReduceMappingsToLongTask<K,V>
4302	<	(map, null, -1, null, transformer, basis, reducer);
3369	>	public boolean tryAdvance(Action<? super Map.Entry<K,V>> action) {
3370	>	if (action == null) throw new NullPointerException();
3371	>	Node<K,V> p;
3372	>	if ((p = advance()) == null)
3373	>	return false;
3374	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3375	>	return true;
3376		}
3377
3378	+	public long estimateSize() { return est; }
3379	+
3380	+	}
3381	+
3382	+	// Parallel bulk operations
3383	+
3384	+	/**
3385	+	* Computes initial batch value for bulk tasks. The returned value
3386	+	* is approximately exp2 of the number of times (minus one) to
3387	+	* split task by two before executing leaf action. This value is
3388	+	* faster to compute and more convenient to use as a guide to
3389	+	* splitting than is the depth, since it is used while dividing by
3390	+	* two anyway.
3391	+	*/
3392	+	final int batchFor(long b) {
3393	+	long n;
3394	+	if (b == Long.MAX_VALUE || (n = sumCount()) <= 1L || n < b)
3395	+	return 0;
3396	+	int sp = ForkJoinPool.getCommonPoolParallelism() << 2; // slack of 4
3397	+	return (b <= 0L || (n /= b) >= sp) ? sp : (int)n;
3398	+	}
3399	+
3400	+	/**
3401	+	* Performs the given action for each (key, value).
3402	+	*
3403	+	* @param parallelismThreshold the (estimated) number of elements
3404	+	* needed for this operation to be executed in parallel
3405	+	* @param action the action
3406	+	* @since 1.8
3407	+	*/
3408	+	public void forEach(long parallelismThreshold,
3409	+	BiAction<? super K,? super V> action) {
3410	+	if (action == null) throw new NullPointerException();
3411	+	new ForEachMappingTask<K,V>
3412	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3413	+	action).invoke();
3414	+	}
3415	+
3416	+	/**
3417	+	* Performs the given action for each non-null transformation
3418	+	* of each (key, value).
3419	+	*
3420	+	* @param parallelismThreshold the (estimated) number of elements
3421	+	* needed for this operation to be executed in parallel
3422	+	* @param transformer a function returning the transformation
3423	+	* for an element, or null if there is no transformation (in
3424	+	* which case the action is not applied)
3425	+	* @param action the action
3426	+	* @since 1.8
3427	+	*/
3428	+	public <U> void forEach(long parallelismThreshold,
3429	+	BiFun<? super K, ? super V, ? extends U> transformer,
3430	+	Action<? super U> action) {
3431	+	if (transformer == null || action == null)
3432	+	throw new NullPointerException();
3433	+	new ForEachTransformedMappingTask<K,V,U>
3434	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3435	+	transformer, action).invoke();
3436	+	}
3437	+
3438	+	/**
3439	+	* Returns a non-null result from applying the given search
3440	+	* function on each (key, value), or null if none.  Upon
3441	+	* success, further element processing is suppressed and the
3442	+	* results of any other parallel invocations of the search
3443	+	* function are ignored.
3444	+	*
3445	+	* @param parallelismThreshold the (estimated) number of elements
3446	+	* needed for this operation to be executed in parallel
3447	+	* @param searchFunction a function returning a non-null
3448	+	* result on success, else null
3449	+	* @return a non-null result from applying the given search
3450	+	* function on each (key, value), or null if none
3451	+	* @since 1.8
3452	+	*/
3453	+	public <U> U search(long parallelismThreshold,
3454	+	BiFun<? super K, ? super V, ? extends U> searchFunction) {
3455	+	if (searchFunction == null) throw new NullPointerException();
3456	+	return new SearchMappingsTask<K,V,U>
3457	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3458	+	searchFunction, new AtomicReference<U>()).invoke();
3459	+	}
3460	+
3461	+	/**
3462	+	* Returns the result of accumulating the given transformation
3463	+	* of all (key, value) pairs using the given reducer to
3464	+	* combine values, or null if none.
3465	+	*
3466	+	* @param parallelismThreshold the (estimated) number of elements
3467	+	* needed for this operation to be executed in parallel
3468	+	* @param transformer a function returning the transformation
3469	+	* for an element, or null if there is no transformation (in
3470	+	* which case it is not combined)
3471	+	* @param reducer a commutative associative combining function
3472	+	* @return the result of accumulating the given transformation
3473	+	* of all (key, value) pairs
3474	+	* @since 1.8
3475	+	*/
3476	+	public <U> U reduce(long parallelismThreshold,
3477	+	BiFun<? super K, ? super V, ? extends U> transformer,
3478	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3479	+	if (transformer == null || reducer == null)
3480	+	throw new NullPointerException();
3481	+	return new MapReduceMappingsTask<K,V,U>
3482	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3483	+	null, transformer, reducer).invoke();
3484	+	}
3485	+
3486	+	/**
3487	+	* Returns the result of accumulating the given transformation
3488	+	* of all (key, value) pairs using the given reducer to
3489	+	* combine values, and the given basis as an identity value.
3490	+	*
3491	+	* @param parallelismThreshold the (estimated) number of elements
3492	+	* needed for this operation to be executed in parallel
3493	+	* @param transformer a function returning the transformation
3494	+	* for an element
3495	+	* @param basis the identity (initial default value) for the reduction
3496	+	* @param reducer a commutative associative combining function
3497	+	* @return the result of accumulating the given transformation
3498	+	* of all (key, value) pairs
3499	+	* @since 1.8
3500	+	*/
3501	+	public double reduceToDouble(long parallelismThreshold,
3502	+	ObjectByObjectToDouble<? super K, ? super V> transformer,
3503	+	double basis,
3504	+	DoubleByDoubleToDouble reducer) {
3505	+	if (transformer == null || reducer == null)
3506	+	throw new NullPointerException();
3507	+	return new MapReduceMappingsToDoubleTask<K,V>
3508	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3509	+	null, transformer, basis, reducer).invoke();
3510	+	}
3511	+
3512	+	/**
3513	+	* Returns the result of accumulating the given transformation
3514	+	* of all (key, value) pairs using the given reducer to
3515	+	* combine values, and the given basis as an identity value.
3516	+	*
3517	+	* @param parallelismThreshold the (estimated) number of elements
3518	+	* needed for this operation to be executed in parallel
3519	+	* @param transformer a function returning the transformation
3520	+	* for an element
3521	+	* @param basis the identity (initial default value) for the reduction
3522	+	* @param reducer a commutative associative combining function
3523	+	* @return the result of accumulating the given transformation
3524	+	* of all (key, value) pairs
3525	+	* @since 1.8
3526	+	*/
3527	+	public long reduceToLong(long parallelismThreshold,
3528	+	ObjectByObjectToLong<? super K, ? super V> transformer,
3529	+	long basis,
3530	+	LongByLongToLong reducer) {
3531	+	if (transformer == null || reducer == null)
3532	+	throw new NullPointerException();
3533	+	return new MapReduceMappingsToLongTask<K,V>
3534	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3535	+	null, transformer, basis, reducer).invoke();
3536	+	}
3537	+
3538	+	/**
3539	+	* Returns the result of accumulating the given transformation
3540	+	* of all (key, value) pairs using the given reducer to
3541	+	* combine values, and the given basis as an identity value.
3542	+	*
3543	+	* @param parallelismThreshold the (estimated) number of elements
3544	+	* needed for this operation to be executed in parallel
3545	+	* @param transformer a function returning the transformation
3546	+	* for an element
3547	+	* @param basis the identity (initial default value) for the reduction
3548	+	* @param reducer a commutative associative combining function
3549	+	* @return the result of accumulating the given transformation
3550	+	* of all (key, value) pairs
3551	+	* @since 1.8
3552	+	*/
3553	+	public int reduceToInt(long parallelismThreshold,
3554	+	ObjectByObjectToInt<? super K, ? super V> transformer,
3555	+	int basis,
3556	+	IntByIntToInt reducer) {
3557	+	if (transformer == null || reducer == null)
3558	+	throw new NullPointerException();
3559	+	return new MapReduceMappingsToIntTask<K,V>
3560	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3561	+	null, transformer, basis, reducer).invoke();
3562	+	}
3563	+
3564	+	/**
3565	+	* Performs the given action for each key.
3566	+	*
3567	+	* @param parallelismThreshold the (estimated) number of elements
3568	+	* needed for this operation to be executed in parallel
3569	+	* @param action the action
3570	+	* @since 1.8
3571	+	*/
3572	+	public void forEachKey(long parallelismThreshold,
3573	+	Action<? super K> action) {
3574	+	if (action == null) throw new NullPointerException();
3575	+	new ForEachKeyTask<K,V>
3576	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3577	+	action).invoke();
3578	+	}
3579	+
3580	+	/**
3581	+	* Performs the given action for each non-null transformation
3582	+	* of each key.
3583	+	*
3584	+	* @param parallelismThreshold the (estimated) number of elements
3585	+	* needed for this operation to be executed in parallel
3586	+	* @param transformer a function returning the transformation
3587	+	* for an element, or null if there is no transformation (in
3588	+	* which case the action is not applied)
3589	+	* @param action the action
3590	+	* @since 1.8
3591	+	*/
3592	+	public <U> void forEachKey(long parallelismThreshold,
3593	+	Fun<? super K, ? extends U> transformer,
3594	+	Action<? super U> action) {
3595	+	if (transformer == null || action == null)
3596	+	throw new NullPointerException();
3597	+	new ForEachTransformedKeyTask<K,V,U>
3598	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3599	+	transformer, action).invoke();
3600	+	}
3601	+
3602	+	/**
3603	+	* Returns a non-null result from applying the given search
3604	+	* function on each key, or null if none. Upon success,
3605	+	* further element processing is suppressed and the results of
3606	+	* any other parallel invocations of the search function are
3607	+	* ignored.
3608	+	*
3609	+	* @param parallelismThreshold the (estimated) number of elements
3610	+	* needed for this operation to be executed in parallel
3611	+	* @param searchFunction a function returning a non-null
3612	+	* result on success, else null
3613	+	* @return a non-null result from applying the given search
3614	+	* function on each key, or null if none
3615	+	* @since 1.8
3616	+	*/
3617	+	public <U> U searchKeys(long parallelismThreshold,
3618	+	Fun<? super K, ? extends U> searchFunction) {
3619	+	if (searchFunction == null) throw new NullPointerException();
3620	+	return new SearchKeysTask<K,V,U>
3621	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3622	+	searchFunction, new AtomicReference<U>()).invoke();
3623	+	}
3624	+
3625	+	/**
3626	+	* Returns the result of accumulating all keys using the given
3627	+	* reducer to combine values, or null if none.
3628	+	*
3629	+	* @param parallelismThreshold the (estimated) number of elements
3630	+	* needed for this operation to be executed in parallel
3631	+	* @param reducer a commutative associative combining function
3632	+	* @return the result of accumulating all keys using the given
3633	+	* reducer to combine values, or null if none
3634	+	* @since 1.8
3635	+	*/
3636	+	public K reduceKeys(long parallelismThreshold,
3637	+	BiFun<? super K, ? super K, ? extends K> reducer) {
3638	+	if (reducer == null) throw new NullPointerException();
3639	+	return new ReduceKeysTask<K,V>
3640	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3641	+	null, reducer).invoke();
3642	+	}
3643	+
3644	+	/**
3645	+	* Returns the result of accumulating the given transformation
3646	+	* of all keys using the given reducer to combine values, or
3647	+	* null if none.
3648	+	*
3649	+	* @param parallelismThreshold the (estimated) number of elements
3650	+	* needed for this operation to be executed in parallel
3651	+	* @param transformer a function returning the transformation
3652	+	* for an element, or null if there is no transformation (in
3653	+	* which case it is not combined)
3654	+	* @param reducer a commutative associative combining function
3655	+	* @return the result of accumulating the given transformation
3656	+	* of all keys
3657	+	* @since 1.8
3658	+	*/
3659	+	public <U> U reduceKeys(long parallelismThreshold,
3660	+	Fun<? super K, ? extends U> transformer,
3661	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3662	+	if (transformer == null || reducer == null)
3663	+	throw new NullPointerException();
3664	+	return new MapReduceKeysTask<K,V,U>
3665	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3666	+	null, transformer, reducer).invoke();
3667	+	}
3668	+
3669	+	/**
3670	+	* Returns the result of accumulating the given transformation
3671	+	* of all keys using the given reducer to combine values, and
3672	+	* the given basis as an identity value.
3673	+	*
3674	+	* @param parallelismThreshold the (estimated) number of elements
3675	+	* needed for this operation to be executed in parallel
3676	+	* @param transformer a function returning the transformation
3677	+	* for an element
3678	+	* @param basis the identity (initial default value) for the reduction
3679	+	* @param reducer a commutative associative combining function
3680	+	* @return the result of accumulating the given transformation
3681	+	* of all keys
3682	+	* @since 1.8
3683	+	*/
3684	+	public double reduceKeysToDouble(long parallelismThreshold,
3685	+	ObjectToDouble<? super K> transformer,
3686	+	double basis,
3687	+	DoubleByDoubleToDouble reducer) {
3688	+	if (transformer == null || reducer == null)
3689	+	throw new NullPointerException();
3690	+	return new MapReduceKeysToDoubleTask<K,V>
3691	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3692	+	null, transformer, basis, reducer).invoke();
3693	+	}
3694	+
3695	+	/**
3696	+	* Returns the result of accumulating the given transformation
3697	+	* of all keys using the given reducer to combine values, and
3698	+	* the given basis as an identity value.
3699	+	*
3700	+	* @param parallelismThreshold the (estimated) number of elements
3701	+	* needed for this operation to be executed in parallel
3702	+	* @param transformer a function returning the transformation
3703	+	* for an element
3704	+	* @param basis the identity (initial default value) for the reduction
3705	+	* @param reducer a commutative associative combining function
3706	+	* @return the result of accumulating the given transformation
3707	+	* of all keys
3708	+	* @since 1.8
3709	+	*/
3710	+	public long reduceKeysToLong(long parallelismThreshold,
3711	+	ObjectToLong<? super K> transformer,
3712	+	long basis,
3713	+	LongByLongToLong reducer) {
3714	+	if (transformer == null || reducer == null)
3715	+	throw new NullPointerException();
3716	+	return new MapReduceKeysToLongTask<K,V>
3717	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3718	+	null, transformer, basis, reducer).invoke();
3719	+	}
3720	+
3721	+	/**
3722	+	* Returns the result of accumulating the given transformation
3723	+	* of all keys using the given reducer to combine values, and
3724	+	* the given basis as an identity value.
3725	+	*
3726	+	* @param parallelismThreshold the (estimated) number of elements
3727	+	* needed for this operation to be executed in parallel
3728	+	* @param transformer a function returning the transformation
3729	+	* for an element
3730	+	* @param basis the identity (initial default value) for the reduction
3731	+	* @param reducer a commutative associative combining function
3732	+	* @return the result of accumulating the given transformation
3733	+	* of all keys
3734	+	* @since 1.8
3735	+	*/
3736	+	public int reduceKeysToInt(long parallelismThreshold,
3737	+	ObjectToInt<? super K> transformer,
3738	+	int basis,
3739	+	IntByIntToInt reducer) {
3740	+	if (transformer == null || reducer == null)
3741	+	throw new NullPointerException();
3742	+	return new MapReduceKeysToIntTask<K,V>
3743	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3744	+	null, transformer, basis, reducer).invoke();
3745	+	}
3746	+
3747	+	/**
3748	+	* Performs the given action for each value.
3749	+	*
3750	+	* @param parallelismThreshold the (estimated) number of elements
3751	+	* needed for this operation to be executed in parallel
3752	+	* @param action the action
3753	+	* @since 1.8
3754	+	*/
3755	+	public void forEachValue(long parallelismThreshold,
3756	+	Action<? super V> action) {
3757	+	if (action == null)
3758	+	throw new NullPointerException();
3759	+	new ForEachValueTask<K,V>
3760	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3761	+	action).invoke();
3762	+	}
3763	+
3764	+	/**
3765	+	* Performs the given action for each non-null transformation
3766	+	* of each value.
3767	+	*
3768	+	* @param parallelismThreshold the (estimated) number of elements
3769	+	* needed for this operation to be executed in parallel
3770	+	* @param transformer a function returning the transformation
3771	+	* for an element, or null if there is no transformation (in
3772	+	* which case the action is not applied)
3773	+	* @param action the action
3774	+	* @since 1.8
3775	+	*/
3776	+	public <U> void forEachValue(long parallelismThreshold,
3777	+	Fun<? super V, ? extends U> transformer,
3778	+	Action<? super U> action) {
3779	+	if (transformer == null || action == null)
3780	+	throw new NullPointerException();
3781	+	new ForEachTransformedValueTask<K,V,U>
3782	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3783	+	transformer, action).invoke();
3784	+	}
3785	+
3786	+	/**
3787	+	* Returns a non-null result from applying the given search
3788	+	* function on each value, or null if none.  Upon success,
3789	+	* further element processing is suppressed and the results of
3790	+	* any other parallel invocations of the search function are
3791	+	* ignored.
3792	+	*
3793	+	* @param parallelismThreshold the (estimated) number of elements
3794	+	* needed for this operation to be executed in parallel
3795	+	* @param searchFunction a function returning a non-null
3796	+	* result on success, else null
3797	+	* @return a non-null result from applying the given search
3798	+	* function on each value, or null if none
3799	+	* @since 1.8
3800	+	*/
3801	+	public <U> U searchValues(long parallelismThreshold,
3802	+	Fun<? super V, ? extends U> searchFunction) {
3803	+	if (searchFunction == null) throw new NullPointerException();
3804	+	return new SearchValuesTask<K,V,U>
3805	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3806	+	searchFunction, new AtomicReference<U>()).invoke();
3807	+	}
3808	+
3809	+	/**
3810	+	* Returns the result of accumulating all values using the
3811	+	* given reducer to combine values, or null if none.
3812	+	*
3813	+	* @param parallelismThreshold the (estimated) number of elements
3814	+	* needed for this operation to be executed in parallel
3815	+	* @param reducer a commutative associative combining function
3816	+	* @return the result of accumulating all values
3817	+	* @since 1.8
3818	+	*/
3819	+	public V reduceValues(long parallelismThreshold,
3820	+	BiFun<? super V, ? super V, ? extends V> reducer) {
3821	+	if (reducer == null) throw new NullPointerException();
3822	+	return new ReduceValuesTask<K,V>
3823	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3824	+	null, reducer).invoke();
3825	+	}
3826	+
3827	+	/**
3828	+	* Returns the result of accumulating the given transformation
3829	+	* of all values using the given reducer to combine values, or
3830	+	* null if none.
3831	+	*
3832	+	* @param parallelismThreshold the (estimated) number of elements
3833	+	* needed for this operation to be executed in parallel
3834	+	* @param transformer a function returning the transformation
3835	+	* for an element, or null if there is no transformation (in
3836	+	* which case it is not combined)
3837	+	* @param reducer a commutative associative combining function
3838	+	* @return the result of accumulating the given transformation
3839	+	* of all values
3840	+	* @since 1.8
3841	+	*/
3842	+	public <U> U reduceValues(long parallelismThreshold,
3843	+	Fun<? super V, ? extends U> transformer,
3844	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3845	+	if (transformer == null || reducer == null)
3846	+	throw new NullPointerException();
3847	+	return new MapReduceValuesTask<K,V,U>
3848	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3849	+	null, transformer, reducer).invoke();
3850	+	}
3851	+
3852	+	/**
3853	+	* Returns the result of accumulating the given transformation
3854	+	* of all values using the given reducer to combine values,
3855	+	* and the given basis as an identity value.
3856	+	*
3857	+	* @param parallelismThreshold the (estimated) number of elements
3858	+	* needed for this operation to be executed in parallel
3859	+	* @param transformer a function returning the transformation
3860	+	* for an element
3861	+	* @param basis the identity (initial default value) for the reduction
3862	+	* @param reducer a commutative associative combining function
3863	+	* @return the result of accumulating the given transformation
3864	+	* of all values
3865	+	* @since 1.8
3866	+	*/
3867	+	public double reduceValuesToDouble(long parallelismThreshold,
3868	+	ObjectToDouble<? super V> transformer,
3869	+	double basis,
3870	+	DoubleByDoubleToDouble reducer) {
3871	+	if (transformer == null || reducer == null)
3872	+	throw new NullPointerException();
3873	+	return new MapReduceValuesToDoubleTask<K,V>
3874	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3875	+	null, transformer, basis, reducer).invoke();
3876	+	}
3877	+
3878	+	/**
3879	+	* Returns the result of accumulating the given transformation
3880	+	* of all values using the given reducer to combine values,
3881	+	* and the given basis as an identity value.
3882	+	*
3883	+	* @param parallelismThreshold the (estimated) number of elements
3884	+	* needed for this operation to be executed in parallel
3885	+	* @param transformer a function returning the transformation
3886	+	* for an element
3887	+	* @param basis the identity (initial default value) for the reduction
3888	+	* @param reducer a commutative associative combining function
3889	+	* @return the result of accumulating the given transformation
3890	+	* of all values
3891	+	* @since 1.8
3892	+	*/
3893	+	public long reduceValuesToLong(long parallelismThreshold,
3894	+	ObjectToLong<? super V> transformer,
3895	+	long basis,
3896	+	LongByLongToLong reducer) {
3897	+	if (transformer == null || reducer == null)
3898	+	throw new NullPointerException();
3899	+	return new MapReduceValuesToLongTask<K,V>
3900	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3901	+	null, transformer, basis, reducer).invoke();
3902	+	}
3903	+
3904	+	/**
3905	+	* Returns the result of accumulating the given transformation
3906	+	* of all values using the given reducer to combine values,
3907	+	* and the given basis as an identity value.
3908	+	*
3909	+	* @param parallelismThreshold the (estimated) number of elements
3910	+	* needed for this operation to be executed in parallel
3911	+	* @param transformer a function returning the transformation
3912	+	* for an element
3913	+	* @param basis the identity (initial default value) for the reduction
3914	+	* @param reducer a commutative associative combining function
3915	+	* @return the result of accumulating the given transformation
3916	+	* of all values
3917	+	* @since 1.8
3918	+	*/
3919	+	public int reduceValuesToInt(long parallelismThreshold,
3920	+	ObjectToInt<? super V> transformer,
3921	+	int basis,
3922	+	IntByIntToInt reducer) {
3923	+	if (transformer == null || reducer == null)
3924	+	throw new NullPointerException();
3925	+	return new MapReduceValuesToIntTask<K,V>
3926	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3927	+	null, transformer, basis, reducer).invoke();
3928	+	}
3929	+
3930	+	/**
3931	+	* Performs the given action for each entry.
3932	+	*
3933	+	* @param parallelismThreshold the (estimated) number of elements
3934	+	* needed for this operation to be executed in parallel
3935	+	* @param action the action
3936	+	* @since 1.8
3937	+	*/
3938	+	public void forEachEntry(long parallelismThreshold,
3939	+	Action<? super Map.Entry<K,V>> action) {
3940	+	if (action == null) throw new NullPointerException();
3941	+	new ForEachEntryTask<K,V>(null, batchFor(parallelismThreshold), 0, 0, table,
3942	+	action).invoke();
3943	+	}
3944	+
3945	+	/**
3946	+	* Performs the given action for each non-null transformation
3947	+	* of each entry.
3948	+	*
3949	+	* @param parallelismThreshold the (estimated) number of elements
3950	+	* needed for this operation to be executed in parallel
3951	+	* @param transformer a function returning the transformation
3952	+	* for an element, or null if there is no transformation (in
3953	+	* which case the action is not applied)
3954	+	* @param action the action
3955	+	* @since 1.8
3956	+	*/
3957	+	public <U> void forEachEntry(long parallelismThreshold,
3958	+	Fun<Map.Entry<K,V>, ? extends U> transformer,
3959	+	Action<? super U> action) {
3960	+	if (transformer == null || action == null)
3961	+	throw new NullPointerException();
3962	+	new ForEachTransformedEntryTask<K,V,U>
3963	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3964	+	transformer, action).invoke();
3965	+	}
3966	+
3967	+	/**
3968	+	* Returns a non-null result from applying the given search
3969	+	* function on each entry, or null if none.  Upon success,
3970	+	* further element processing is suppressed and the results of
3971	+	* any other parallel invocations of the search function are
3972	+	* ignored.
3973	+	*
3974	+	* @param parallelismThreshold the (estimated) number of elements
3975	+	* needed for this operation to be executed in parallel
3976	+	* @param searchFunction a function returning a non-null
3977	+	* result on success, else null
3978	+	* @return a non-null result from applying the given search
3979	+	* function on each entry, or null if none
3980	+	* @since 1.8
3981	+	*/
3982	+	public <U> U searchEntries(long parallelismThreshold,
3983	+	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
3984	+	if (searchFunction == null) throw new NullPointerException();
3985	+	return new SearchEntriesTask<K,V,U>
3986	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3987	+	searchFunction, new AtomicReference<U>()).invoke();
3988	+	}
3989	+
3990	+	/**
3991	+	* Returns the result of accumulating all entries using the
3992	+	* given reducer to combine values, or null if none.
3993	+	*
3994	+	* @param parallelismThreshold the (estimated) number of elements
3995	+	* needed for this operation to be executed in parallel
3996	+	* @param reducer a commutative associative combining function
3997	+	* @return the result of accumulating all entries
3998	+	* @since 1.8
3999	+	*/
4000	+	public Map.Entry<K,V> reduceEntries(long parallelismThreshold,
4001	+	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4002	+	if (reducer == null) throw new NullPointerException();
4003	+	return new ReduceEntriesTask<K,V>
4004	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4005	+	null, reducer).invoke();
4006	+	}
4007	+
4008	+	/**
4009	+	* Returns the result of accumulating the given transformation
4010	+	* of all entries using the given reducer to combine values,
4011	+	* or null if none.
4012	+	*
4013	+	* @param parallelismThreshold the (estimated) number of elements
4014	+	* needed for this operation to be executed in parallel
4015	+	* @param transformer a function returning the transformation
4016	+	* for an element, or null if there is no transformation (in
4017	+	* which case it is not combined)
4018	+	* @param reducer a commutative associative combining function
4019	+	* @return the result of accumulating the given transformation
4020	+	* of all entries
4021	+	* @since 1.8
4022	+	*/
4023	+	public <U> U reduceEntries(long parallelismThreshold,
4024	+	Fun<Map.Entry<K,V>, ? extends U> transformer,
4025	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4026	+	if (transformer == null || reducer == null)
4027	+	throw new NullPointerException();
4028	+	return new MapReduceEntriesTask<K,V,U>
4029	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4030	+	null, transformer, reducer).invoke();
4031	+	}
4032	+
4033	+	/**
4034	+	* Returns the result of accumulating the given transformation
4035	+	* of all entries using the given reducer to combine values,
4036	+	* and the given basis as an identity value.
4037	+	*
4038	+	* @param parallelismThreshold the (estimated) number of elements
4039	+	* needed for this operation to be executed in parallel
4040	+	* @param transformer a function returning the transformation
4041	+	* for an element
4042	+	* @param basis the identity (initial default value) for the reduction
4043	+	* @param reducer a commutative associative combining function
4044	+	* @return the result of accumulating the given transformation
4045	+	* of all entries
4046	+	* @since 1.8
4047	+	*/
4048	+	public double reduceEntriesToDouble(long parallelismThreshold,
4049	+	ObjectToDouble<Map.Entry<K,V>> transformer,
4050	+	double basis,
4051	+	DoubleByDoubleToDouble reducer) {
4052	+	if (transformer == null || reducer == null)
4053	+	throw new NullPointerException();
4054	+	return new MapReduceEntriesToDoubleTask<K,V>
4055	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4056	+	null, transformer, basis, reducer).invoke();
4057	+	}
4058	+
4059	+	/**
4060	+	* Returns the result of accumulating the given transformation
4061	+	* of all entries using the given reducer to combine values,
4062	+	* and the given basis as an identity value.
4063	+	*
4064	+	* @param parallelismThreshold the (estimated) number of elements
4065	+	* needed for this operation to be executed in parallel
4066	+	* @param transformer a function returning the transformation
4067	+	* for an element
4068	+	* @param basis the identity (initial default value) for the reduction
4069	+	* @param reducer a commutative associative combining function
4070	+	* @return the result of accumulating the given transformation
4071	+	* of all entries
4072	+	* @since 1.8
4073	+	*/
4074	+	public long reduceEntriesToLong(long parallelismThreshold,
4075	+	ObjectToLong<Map.Entry<K,V>> transformer,
4076	+	long basis,
4077	+	LongByLongToLong reducer) {
4078	+	if (transformer == null || reducer == null)
4079	+	throw new NullPointerException();
4080	+	return new MapReduceEntriesToLongTask<K,V>
4081	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4082	+	null, transformer, basis, reducer).invoke();
4083	+	}
4084	+
4085	+	/**
4086	+	* Returns the result of accumulating the given transformation
4087	+	* of all entries using the given reducer to combine values,
4088	+	* and the given basis as an identity value.
4089	+	*
4090	+	* @param parallelismThreshold the (estimated) number of elements
4091	+	* needed for this operation to be executed in parallel
4092	+	* @param transformer a function returning the transformation
4093	+	* for an element
4094	+	* @param basis the identity (initial default value) for the reduction
4095	+	* @param reducer a commutative associative combining function
4096	+	* @return the result of accumulating the given transformation
4097	+	* of all entries
4098	+	* @since 1.8
4099	+	*/
4100	+	public int reduceEntriesToInt(long parallelismThreshold,
4101	+	ObjectToInt<Map.Entry<K,V>> transformer,
4102	+	int basis,
4103	+	IntByIntToInt reducer) {
4104	+	if (transformer == null || reducer == null)
4105	+	throw new NullPointerException();
4106	+	return new MapReduceEntriesToIntTask<K,V>
4107	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4108	+	null, transformer, basis, reducer).invoke();
4109	+	}
4110	+
4111	+
4112	+	/* ----------------Views -------------- */
4113	+
4114	+	/**
4115	+	* Base class for views.
4116	+	*/
4117	+	abstract static class CollectionView<K,V,E>
4118	+	implements Collection<E>, java.io.Serializable {
4119	+	private static final long serialVersionUID = 7249069246763182397L;
4120	+	final ConcurrentHashMapV8<K,V> map;
4121	+	CollectionView(ConcurrentHashMapV8<K,V> map)  { this.map = map; }
4122	+
4123		/**
4124	<	* Returns a task that when invoked, returns the result of
4307	<	* accumulating the given transformation of all (key, value) pairs
4308	<	* using the given reducer to combine values, and the given
4309	<	* basis as an identity value.
4124	>	* Returns the map backing this view.
4125		*
4126	<	* @param transformer a function returning the transformation
4312	<	* for an element
4313	<	* @param basis the identity (initial default value) for the reduction
4314	<	* @param reducer a commutative associative combining function
4315	<	* @return the task
4126	>	* @return the map backing this view
4127		*/
4128	<	public static <K,V> ForkJoinTask<Integer> reduceToInt
4318	<	(ConcurrentHashMapV8<K,V> map,
4319	<	ObjectByObjectToInt<? super K, ? super V> transformer,
4320	<	int basis,
4321	<	IntByIntToInt reducer) {
4322	<	if (transformer == null || reducer == null)
4323	<	throw new NullPointerException();
4324	<	return new MapReduceMappingsToIntTask<K,V>
4325	<	(map, null, -1, null, transformer, basis, reducer);
4326	<	}
4128	>	public ConcurrentHashMapV8<K,V> getMap() { return map; }
4129
4130		/**
4131	<	* Returns a task that when invoked, performs the given action
4132	<	* for each key.
4331	<	*
4332	<	* @param map the map
4333	<	* @param action the action
4334	<	* @return the task
4131	>	* Removes all of the elements from this view, by removing all
4132	>	* the mappings from the map backing this view.
4133		*/
4134	<	public static <K,V> ForkJoinTask<Void> forEachKey
4135	<	(ConcurrentHashMapV8<K,V> map,
4136	<	Action<K> action) {
4339	<	if (action == null) throw new NullPointerException();
4340	<	return new ForEachKeyTask<K,V>(map, null, -1, action);
4341	<	}
4134	>	public final void clear()      { map.clear(); }
4135	>	public final int size()        { return map.size(); }
4136	>	public final boolean isEmpty() { return map.isEmpty(); }
4137
4138	+	// implementations below rely on concrete classes supplying these
4139	+	// abstract methods
4140		/**
4141	<	* Returns a task that when invoked, performs the given action
4142	<	* for each non-null transformation of each key.
4143	<	*
4144	<	* @param map the map
4145	<	* @param transformer a function returning the transformation
4146	<	* for an element, or null of there is no transformation (in
4147	<	* which case the action is not applied)
4148	<	* @param action the action
4149	<	* @return the task
4150	<	*/
4151	<	public static <K,V,U> ForkJoinTask<Void> forEachKey
4152	<	(ConcurrentHashMapV8<K,V> map,
4153	<	Fun<? super K, ? extends U> transformer,
4154	<	Action<U> action) {
4155	<	if (transformer == null || action == null)
4156	<	throw new NullPointerException();
4157	<	return new ForEachTransformedKeyTask<K,V,U>
4158	<	(map, null, -1, transformer, action);
4141	>	* Returns a "weakly consistent" iterator that will never
4142	>	* throw {@link ConcurrentModificationException}, and
4143	>	* guarantees to traverse elements as they existed upon
4144	>	* construction of the iterator, and may (but is not
4145	>	* guaranteed to) reflect any modifications subsequent to
4146	>	* construction.
4147	>	*/
4148	>	public abstract Iterator<E> iterator();
4149	>	public abstract boolean contains(Object o);
4150	>	public abstract boolean remove(Object o);
4151	>
4152	>	private static final String oomeMsg = "Required array size too large";
4153	>
4154	>	public final Object[] toArray() {
4155	>	long sz = map.mappingCount();
4156	>	if (sz > MAX_ARRAY_SIZE)
4157	>	throw new OutOfMemoryError(oomeMsg);
4158	>	int n = (int)sz;
4159	>	Object[] r = new Object[n];
4160	>	int i = 0;
4161	>	for (E e : this) {
4162	>	if (i == n) {
4163	>	if (n >= MAX_ARRAY_SIZE)
4164	>	throw new OutOfMemoryError(oomeMsg);
4165	>	if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
4166	>	n = MAX_ARRAY_SIZE;
4167	>	else
4168	>	n += (n >>> 1) + 1;
4169	>	r = Arrays.copyOf(r, n);
4170	>	}
4171	>	r[i++] = e;
4172	>	}
4173	>	return (i == n) ? r : Arrays.copyOf(r, i);
4174		}
4175
4176	<	/**
4177	<	* Returns a task that when invoked, returns a non-null result
4178	<	* from applying the given search function on each key, or
4179	<	* null if none.  Upon success, further element processing is
4180	<	* suppressed and the results of any other parallel
4181	<	* invocations of the search function are ignored.
4182	<	*
4183	<	* @param map the map
4184	<	* @param searchFunction a function returning a non-null
4185	<	* result on success, else null
4186	<	* @return the task
4187	<	*/
4188	<	public static <K,V,U> ForkJoinTask<U> searchKeys
4189	<	(ConcurrentHashMapV8<K,V> map,
4190	<	Fun<? super K, ? extends U> searchFunction) {
4191	<	if (searchFunction == null) throw new NullPointerException();
4192	<	return new SearchKeysTask<K,V,U>
4193	<	(map, null, -1, searchFunction,
4194	<	new AtomicReference<U>());
4176	>	@SuppressWarnings("unchecked")
4177	>	public final <T> T[] toArray(T[] a) {
4178	>	long sz = map.mappingCount();
4179	>	if (sz > MAX_ARRAY_SIZE)
4180	>	throw new OutOfMemoryError(oomeMsg);
4181	>	int m = (int)sz;
4182	>	T[] r = (a.length >= m) ? a :
4183	>	(T[])java.lang.reflect.Array
4184	>	.newInstance(a.getClass().getComponentType(), m);
4185	>	int n = r.length;
4186	>	int i = 0;
4187	>	for (E e : this) {
4188	>	if (i == n) {
4189	>	if (n >= MAX_ARRAY_SIZE)
4190	>	throw new OutOfMemoryError(oomeMsg);
4191	>	if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
4192	>	n = MAX_ARRAY_SIZE;
4193	>	else
4194	>	n += (n >>> 1) + 1;
4195	>	r = Arrays.copyOf(r, n);
4196	>	}
4197	>	r[i++] = (T)e;
4198	>	}
4199	>	if (a == r && i < n) {
4200	>	r[i] = null; // null-terminate
4201	>	return r;
4202	>	}
4203	>	return (i == n) ? r : Arrays.copyOf(r, i);
4204		}
4205
4206		/**
4207	<	* Returns a task that when invoked, returns the result of
4208	<	* accumulating all keys using the given reducer to combine
4209	<	* values, or null if none.
4207	>	* Returns a string representation of this collection.
4208	>	* The string representation consists of the string representations
4209	>	* of the collection's elements in the order they are returned by
4210	>	* its iterator, enclosed in square brackets ({@code "[]"}).
4211	>	* Adjacent elements are separated by the characters {@code ", "}
4212	>	* (comma and space).  Elements are converted to strings as by
4213	>	* {@link String#valueOf(Object)}.
4214		*
4215	<	* @param map the map
4391	<	* @param reducer a commutative associative combining function
4392	<	* @return the task
4215	>	* @return a string representation of this collection
4216		*/
4217	<	public static <K,V> ForkJoinTask<K> reduceKeys
4218	<	(ConcurrentHashMapV8<K,V> map,
4219	<	BiFun<? super K, ? super K, ? extends K> reducer) {
4220	<	if (reducer == null) throw new NullPointerException();
4221	<	return new ReduceKeysTask<K,V>
4222	<	(map, null, -1, null, reducer);
4217	>	public final String toString() {
4218	>	StringBuilder sb = new StringBuilder();
4219	>	sb.append('[');
4220	>	Iterator<E> it = iterator();
4221	>	if (it.hasNext()) {
4222	>	for (;;) {
4223	>	Object e = it.next();
4224	>	sb.append(e == this ? "(this Collection)" : e);
4225	>	if (!it.hasNext())
4226	>	break;
4227	>	sb.append(',').append(' ');
4228	>	}
4229	>	}
4230	>	return sb.append(']').toString();
4231		}
4232
4233	<	/**
4234	<	* Returns a task that when invoked, returns the result of
4235	<	* accumulating the given transformation of all keys using the given
4236	<	* reducer to combine values, or null if none.
4237	<	*
4238	<	* @param map the map
4239	<	* @param transformer a function returning the transformation
4240	<	* for an element, or null of there is no transformation (in
4410	<	* which case it is not combined).
4411	<	* @param reducer a commutative associative combining function
4412	<	* @return the task
4413	<	*/
4414	<	public static <K,V,U> ForkJoinTask<U> reduceKeys
4415	<	(ConcurrentHashMapV8<K,V> map,
4416	<	Fun<? super K, ? extends U> transformer,
4417	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4418	<	if (transformer == null || reducer == null)
4419	<	throw new NullPointerException();
4420	<	return new MapReduceKeysTask<K,V,U>
4421	<	(map, null, -1, null, transformer, reducer);
4233	>	public final boolean containsAll(Collection<?> c) {
4234	>	if (c != this) {
4235	>	for (Object e : c) {
4236	>	if (e == null || !contains(e))
4237	>	return false;
4238	>	}
4239	>	}
4240	>	return true;
4241		}
4242
4243	<	/**
4244	<	* Returns a task that when invoked, returns the result of
4245	<	* accumulating the given transformation of all keys using the given
4246	<	* reducer to combine values, and the given basis as an
4247	<	* identity value.
4248	<	*
4249	<	* @param map the map
4250	<	* @param transformer a function returning the transformation
4251	<	* for an element
4433	<	* @param basis the identity (initial default value) for the reduction
4434	<	* @param reducer a commutative associative combining function
4435	<	* @return the task
4436	<	*/
4437	<	public static <K,V> ForkJoinTask<Double> reduceKeysToDouble
4438	<	(ConcurrentHashMapV8<K,V> map,
4439	<	ObjectToDouble<? super K> transformer,
4440	<	double basis,
4441	<	DoubleByDoubleToDouble reducer) {
4442	<	if (transformer == null || reducer == null)
4443	<	throw new NullPointerException();
4444	<	return new MapReduceKeysToDoubleTask<K,V>
4445	<	(map, null, -1, null, transformer, basis, reducer);
4243	>	public final boolean removeAll(Collection<?> c) {
4244	>	boolean modified = false;
4245	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4246	>	if (c.contains(it.next())) {
4247	>	it.remove();
4248	>	modified = true;
4249	>	}
4250	>	}
4251	>	return modified;
4252		}
4253
4254	<	/**
4255	<	* Returns a task that when invoked, returns the result of
4256	<	* accumulating the given transformation of all keys using the given
4257	<	* reducer to combine values, and the given basis as an
4258	<	* identity value.
4259	<	*
4260	<	* @param map the map
4261	<	* @param transformer a function returning the transformation
4262	<	* for an element
4457	<	* @param basis the identity (initial default value) for the reduction
4458	<	* @param reducer a commutative associative combining function
4459	<	* @return the task
4460	<	*/
4461	<	public static <K,V> ForkJoinTask<Long> reduceKeysToLong
4462	<	(ConcurrentHashMapV8<K,V> map,
4463	<	ObjectToLong<? super K> transformer,
4464	<	long basis,
4465	<	LongByLongToLong reducer) {
4466	<	if (transformer == null || reducer == null)
4467	<	throw new NullPointerException();
4468	<	return new MapReduceKeysToLongTask<K,V>
4469	<	(map, null, -1, null, transformer, basis, reducer);
4254	>	public final boolean retainAll(Collection<?> c) {
4255	>	boolean modified = false;
4256	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4257	>	if (!c.contains(it.next())) {
4258	>	it.remove();
4259	>	modified = true;
4260	>	}
4261	>	}
4262	>	return modified;
4263		}
4264
4265	<	/**
4266	<	* Returns a task that when invoked, returns the result of
4267	<	* accumulating the given transformation of all keys using the given
4268	<	* reducer to combine values, and the given basis as an
4269	<	* identity value.
4270	<	*
4271	<	* @param map the map
4272	<	* @param transformer a function returning the transformation
4273	<	* for an element
4274	<	* @param basis the identity (initial default value) for the reduction
4275	<	* @param reducer a commutative associative combining function
4276	<	* @return the task
4277	<	*/
4278	<	public static <K,V> ForkJoinTask<Integer> reduceKeysToInt
4279	<	(ConcurrentHashMapV8<K,V> map,
4280	<	ObjectToInt<? super K> transformer,
4281	<	int basis,
4282	<	IntByIntToInt reducer) {
4283	<	if (transformer == null || reducer == null)
4284	<	throw new NullPointerException();
4492	<	return new MapReduceKeysToIntTask<K,V>
4493	<	(map, null, -1, null, transformer, basis, reducer);
4265	>	}
4266	>
4267	>	/**
4268	>	* A view of a ConcurrentHashMapV8 as a {@link Set} of keys, in
4269	>	* which additions may optionally be enabled by mapping to a
4270	>	* common value.  This class cannot be directly instantiated.
4271	>	* See {@link #keySet() keySet()},
4272	>	* {@link #keySet(Object) keySet(V)},
4273	>	* {@link #newKeySet() newKeySet()},
4274	>	* {@link #newKeySet(int) newKeySet(int)}.
4275	>	*
4276	>	* @since 1.8
4277	>	*/
4278	>	public static class KeySetView<K,V> extends CollectionView<K,V,K>
4279	>	implements Set<K>, java.io.Serializable {
4280	>	private static final long serialVersionUID = 7249069246763182397L;
4281	>	private final V value;
4282	>	KeySetView(ConcurrentHashMapV8<K,V> map, V value) {  // non-public
4283	>	super(map);
4284	>	this.value = value;
4285		}
4286
4287		/**
4288	<	* Returns a task that when invoked, performs the given action
4289	<	* for each value.
4288	>	* Returns the default mapped value for additions,
4289	>	* or {@code null} if additions are not supported.
4290		*
4291	<	* @param map the map
4292	<	* @param action the action
4291	>	* @return the default mapped value for additions, or {@code null}
4292	>	* if not supported
4293		*/
4294	<	public static <K,V> ForkJoinTask<Void> forEachValue
4504	<	(ConcurrentHashMapV8<K,V> map,
4505	<	Action<V> action) {
4506	<	if (action == null) throw new NullPointerException();
4507	<	return new ForEachValueTask<K,V>(map, null, -1, action);
4508	<	}
4294	>	public V getMappedValue() { return value; }
4295
4296		/**
4297	<	* Returns a task that when invoked, performs the given action
4298	<	* for each non-null transformation of each value.
4513	<	*
4514	<	* @param map the map
4515	<	* @param transformer a function returning the transformation
4516	<	* for an element, or null of there is no transformation (in
4517	<	* which case the action is not applied)
4518	<	* @param action the action
4297	>	* {@inheritDoc}
4298	>	* @throws NullPointerException if the specified key is null
4299		*/
4300	<	public static <K,V,U> ForkJoinTask<Void> forEachValue
4521	<	(ConcurrentHashMapV8<K,V> map,
4522	<	Fun<? super V, ? extends U> transformer,
4523	<	Action<U> action) {
4524	<	if (transformer == null || action == null)
4525	<	throw new NullPointerException();
4526	<	return new ForEachTransformedValueTask<K,V,U>
4527	<	(map, null, -1, transformer, action);
4528	<	}
4300	>	public boolean contains(Object o) { return map.containsKey(o); }
4301
4302		/**
4303	<	* Returns a task that when invoked, returns a non-null result
4304	<	* from applying the given search function on each value, or
4305	<	* null if none.  Upon success, further element processing is
4534	<	* suppressed and the results of any other parallel
4535	<	* invocations of the search function are ignored.
4536	<	*
4537	<	* @param map the map
4538	<	* @param searchFunction a function returning a non-null
4539	<	* result on success, else null
4540	<	* @return the task
4303	>	* Removes the key from this map view, by removing the key (and its
4304	>	* corresponding value) from the backing map.  This method does
4305	>	* nothing if the key is not in the map.
4306		*
4307	+	* @param  o the key to be removed from the backing map
4308	+	* @return {@code true} if the backing map contained the specified key
4309	+	* @throws NullPointerException if the specified key is null
4310		*/
4311	<	public static <K,V,U> ForkJoinTask<U> searchValues
4544	<	(ConcurrentHashMapV8<K,V> map,
4545	<	Fun<? super V, ? extends U> searchFunction) {
4546	<	if (searchFunction == null) throw new NullPointerException();
4547	<	return new SearchValuesTask<K,V,U>
4548	<	(map, null, -1, searchFunction,
4549	<	new AtomicReference<U>());
4550	<	}
4311	>	public boolean remove(Object o) { return map.remove(o) != null; }
4312
4313		/**
4314	<	* Returns a task that when invoked, returns the result of
4554	<	* accumulating all values using the given reducer to combine
4555	<	* values, or null if none.
4556	<	*
4557	<	* @param map the map
4558	<	* @param reducer a commutative associative combining function
4559	<	* @return the task
4314	>	* @return an iterator over the keys of the backing map
4315		*/
4316	<	public static <K,V> ForkJoinTask<V> reduceValues
4317	<	(ConcurrentHashMapV8<K,V> map,
4318	<	BiFun<? super V, ? super V, ? extends V> reducer) {
4319	<	if (reducer == null) throw new NullPointerException();
4320	<	return new ReduceValuesTask<K,V>
4566	<	(map, null, -1, null, reducer);
4316	>	public Iterator<K> iterator() {
4317	>	Node<K,V>[] t;
4318	>	ConcurrentHashMapV8<K,V> m = map;
4319	>	int f = (t = m.table) == null ? 0 : t.length;
4320	>	return new KeyIterator<K,V>(t, f, 0, f, m);
4321		}
4322
4323		/**
4324	<	* Returns a task that when invoked, returns the result of
4325	<	* accumulating the given transformation of all values using the
4572	<	* given reducer to combine values, or null if none.
4324	>	* Adds the specified key to this set view by mapping the key to
4325	>	* the default mapped value in the backing map, if defined.
4326		*
4327	<	* @param map the map
4328	<	* @param transformer a function returning the transformation
4329	<	* for an element, or null of there is no transformation (in
4330	<	* which case it is not combined).
4331	<	* @param reducer a commutative associative combining function
4579	<	* @return the task
4327	>	* @param e key to be added
4328	>	* @return {@code true} if this set changed as a result of the call
4329	>	* @throws NullPointerException if the specified key is null
4330	>	* @throws UnsupportedOperationException if no default mapped value
4331	>	* for additions was provided
4332		*/
4333	<	public static <K,V,U> ForkJoinTask<U> reduceValues
4334	<	(ConcurrentHashMapV8<K,V> map,
4335	<	Fun<? super V, ? extends U> transformer,
4336	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4337	<	if (transformer == null || reducer == null)
4586	<	throw new NullPointerException();
4587	<	return new MapReduceValuesTask<K,V,U>
4588	<	(map, null, -1, null, transformer, reducer);
4333	>	public boolean add(K e) {
4334	>	V v;
4335	>	if ((v = value) == null)
4336	>	throw new UnsupportedOperationException();
4337	>	return map.putVal(e, v, true) == null;
4338		}
4339
4340		/**
4341	<	* Returns a task that when invoked, returns the result of
4342	<	* accumulating the given transformation of all values using the
4594	<	* given reducer to combine values, and the given basis as an
4595	<	* identity value.
4341	>	* Adds all of the elements in the specified collection to this set,
4342	>	* as if by calling {@link #add} on each one.
4343		*
4344	<	* @param map the map
4345	<	* @param transformer a function returning the transformation
4346	<	* for an element
4347	<	* @param basis the identity (initial default value) for the reduction
4348	<	* @param reducer a commutative associative combining function
4349	<	* @return the task
4344	>	* @param c the elements to be inserted into this set
4345	>	* @return {@code true} if this set changed as a result of the call
4346	>	* @throws NullPointerException if the collection or any of its
4347	>	* elements are {@code null}
4348	>	* @throws UnsupportedOperationException if no default mapped value
4349	>	* for additions was provided
4350		*/
4351	<	public static <K,V> ForkJoinTask<Double> reduceValuesToDouble
4352	<	(ConcurrentHashMapV8<K,V> map,
4353	<	ObjectToDouble<? super V> transformer,
4354	<	double basis,
4355	<	DoubleByDoubleToDouble reducer) {
4356	<	if (transformer == null || reducer == null)
4357	<	throw new NullPointerException();
4358	<	return new MapReduceValuesToDoubleTask<K,V>
4359	<	(map, null, -1, null, transformer, basis, reducer);
4351	>	public boolean addAll(Collection<? extends K> c) {
4352	>	boolean added = false;
4353	>	V v;
4354	>	if ((v = value) == null)
4355	>	throw new UnsupportedOperationException();
4356	>	for (K e : c) {
4357	>	if (map.putVal(e, v, true) == null)
4358	>	added = true;
4359	>	}
4360	>	return added;
4361		}
4362
4363	<	/**
4364	<	* Returns a task that when invoked, returns the result of
4365	<	* accumulating the given transformation of all values using the
4366	<	* given reducer to combine values, and the given basis as an
4367	<	* identity value.
4620	<	*
4621	<	* @param map the map
4622	<	* @param transformer a function returning the transformation
4623	<	* for an element
4624	<	* @param basis the identity (initial default value) for the reduction
4625	<	* @param reducer a commutative associative combining function
4626	<	* @return the task
4627	<	*/
4628	<	public static <K,V> ForkJoinTask<Long> reduceValuesToLong
4629	<	(ConcurrentHashMapV8<K,V> map,
4630	<	ObjectToLong<? super V> transformer,
4631	<	long basis,
4632	<	LongByLongToLong reducer) {
4633	<	if (transformer == null || reducer == null)
4634	<	throw new NullPointerException();
4635	<	return new MapReduceValuesToLongTask<K,V>
4636	<	(map, null, -1, null, transformer, basis, reducer);
4363	>	public int hashCode() {
4364	>	int h = 0;
4365	>	for (K e : this)
4366	>	h += e.hashCode();
4367	>	return h;
4368		}
4369
4370	<	/**
4371	<	* Returns a task that when invoked, returns the result of
4372	<	* accumulating the given transformation of all values using the
4373	<	* given reducer to combine values, and the given basis as an
4374	<	* identity value.
4644	<	*
4645	<	* @param map the map
4646	<	* @param transformer a function returning the transformation
4647	<	* for an element
4648	<	* @param basis the identity (initial default value) for the reduction
4649	<	* @param reducer a commutative associative combining function
4650	<	* @return the task
4651	<	*/
4652	<	public static <K,V> ForkJoinTask<Integer> reduceValuesToInt
4653	<	(ConcurrentHashMapV8<K,V> map,
4654	<	ObjectToInt<? super V> transformer,
4655	<	int basis,
4656	<	IntByIntToInt reducer) {
4657	<	if (transformer == null || reducer == null)
4658	<	throw new NullPointerException();
4659	<	return new MapReduceValuesToIntTask<K,V>
4660	<	(map, null, -1, null, transformer, basis, reducer);
4370	>	public boolean equals(Object o) {
4371	>	Set<?> c;
4372	>	return ((o instanceof Set) &&
4373	>	((c = (Set<?>)o) == this ||
4374	>	(containsAll(c) && c.containsAll(this))));
4375		}
4376
4377	<	/**
4378	<	* Returns a task that when invoked, perform the given action
4379	<	* for each entry.
4380	<	*
4381	<	* @param map the map
4382	<	* @param action the action
4669	<	*/
4670	<	public static <K,V> ForkJoinTask<Void> forEachEntry
4671	<	(ConcurrentHashMapV8<K,V> map,
4672	<	Action<Map.Entry<K,V>> action) {
4673	<	if (action == null) throw new NullPointerException();
4674	<	return new ForEachEntryTask<K,V>(map, null, -1, action);
4377	>	public ConcurrentHashMapSpliterator<K> spliterator() {
4378	>	Node<K,V>[] t;
4379	>	ConcurrentHashMapV8<K,V> m = map;
4380	>	long n = m.sumCount();
4381	>	int f = (t = m.table) == null ? 0 : t.length;
4382	>	return new KeySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4383		}
4384
4385	<	/**
4386	<	* Returns a task that when invoked, perform the given action
4387	<	* for each non-null transformation of each entry.
4388	<	*
4389	<	* @param map the map
4390	<	* @param transformer a function returning the transformation
4391	<	* for an element, or null of there is no transformation (in
4392	<	* which case the action is not applied)
4685	<	* @param action the action
4686	<	*/
4687	<	public static <K,V,U> ForkJoinTask<Void> forEachEntry
4688	<	(ConcurrentHashMapV8<K,V> map,
4689	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
4690	<	Action<U> action) {
4691	<	if (transformer == null || action == null)
4692	<	throw new NullPointerException();
4693	<	return new ForEachTransformedEntryTask<K,V,U>
4694	<	(map, null, -1, transformer, action);
4385	>	public void forEach(Action<? super K> action) {
4386	>	if (action == null) throw new NullPointerException();
4387	>	Node<K,V>[] t;
4388	>	if ((t = map.table) != null) {
4389	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4390	>	for (Node<K,V> p; (p = it.advance()) != null; )
4391	>	action.apply(p.key);
4392	>	}
4393		}
4394	+	}
4395
4396	<	/**
4397	<	* Returns a task that when invoked, returns a non-null result
4398	<	* from applying the given search function on each entry, or
4399	<	* null if none.  Upon success, further element processing is
4400	<	* suppressed and the results of any other parallel
4401	<	* invocations of the search function are ignored.
4402	<	*
4403	<	* @param map the map
4404	<	* @param searchFunction a function returning a non-null
4405	<	* result on success, else null
4406	<	* @return the task
4708	<	*
4709	<	*/
4710	<	public static <K,V,U> ForkJoinTask<U> searchEntries
4711	<	(ConcurrentHashMapV8<K,V> map,
4712	<	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4713	<	if (searchFunction == null) throw new NullPointerException();
4714	<	return new SearchEntriesTask<K,V,U>
4715	<	(map, null, -1, searchFunction,
4716	<	new AtomicReference<U>());
4396	>	/**
4397	>	* A view of a ConcurrentHashMapV8 as a {@link Collection} of
4398	>	* values, in which additions are disabled. This class cannot be
4399	>	* directly instantiated. See {@link #values()}.
4400	>	*/
4401	>	static final class ValuesView<K,V> extends CollectionView<K,V,V>
4402	>	implements Collection<V>, java.io.Serializable {
4403	>	private static final long serialVersionUID = 2249069246763182397L;
4404	>	ValuesView(ConcurrentHashMapV8<K,V> map) { super(map); }
4405	>	public final boolean contains(Object o) {
4406	>	return map.containsValue(o);
4407		}
4408
4409	<	/**
4410	<	* Returns a task that when invoked, returns the result of
4411	<	* accumulating all entries using the given reducer to combine
4412	<	* values, or null if none.
4413	<	*
4414	<	* @param map the map
4415	<	* @param reducer a commutative associative combining function
4416	<	* @return the task
4417	<	*/
4418	<	public static <K,V> ForkJoinTask<Map.Entry<K,V>> reduceEntries
4729	<	(ConcurrentHashMapV8<K,V> map,
4730	<	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4731	<	if (reducer == null) throw new NullPointerException();
4732	<	return new ReduceEntriesTask<K,V>
4733	<	(map, null, -1, null, reducer);
4409	>	public final boolean remove(Object o) {
4410	>	if (o != null) {
4411	>	for (Iterator<V> it = iterator(); it.hasNext();) {
4412	>	if (o.equals(it.next())) {
4413	>	it.remove();
4414	>	return true;
4415	>	}
4416	>	}
4417	>	}
4418	>	return false;
4419		}
4420
4421	<	/**
4422	<	* Returns a task that when invoked, returns the result of
4423	<	* accumulating the given transformation of all entries using the
4424	<	* given reducer to combine values, or null if none.
4425	<	*
4741	<	* @param map the map
4742	<	* @param transformer a function returning the transformation
4743	<	* for an element, or null of there is no transformation (in
4744	<	* which case it is not combined).
4745	<	* @param reducer a commutative associative combining function
4746	<	* @return the task
4747	<	*/
4748	<	public static <K,V,U> ForkJoinTask<U> reduceEntries
4749	<	(ConcurrentHashMapV8<K,V> map,
4750	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
4751	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4752	<	if (transformer == null || reducer == null)
4753	<	throw new NullPointerException();
4754	<	return new MapReduceEntriesTask<K,V,U>
4755	<	(map, null, -1, null, transformer, reducer);
4421	>	public final Iterator<V> iterator() {
4422	>	ConcurrentHashMapV8<K,V> m = map;
4423	>	Node<K,V>[] t;
4424	>	int f = (t = m.table) == null ? 0 : t.length;
4425	>	return new ValueIterator<K,V>(t, f, 0, f, m);
4426		}
4427
4428	<	/**
4429	<	* Returns a task that when invoked, returns the result of
4430	<	* accumulating the given transformation of all entries using the
4431	<	* given reducer to combine values, and the given basis as an
4432	<	* identity value.
4763	<	*
4764	<	* @param map the map
4765	<	* @param transformer a function returning the transformation
4766	<	* for an element
4767	<	* @param basis the identity (initial default value) for the reduction
4768	<	* @param reducer a commutative associative combining function
4769	<	* @return the task
4770	<	*/
4771	<	public static <K,V> ForkJoinTask<Double> reduceEntriesToDouble
4772	<	(ConcurrentHashMapV8<K,V> map,
4773	<	ObjectToDouble<Map.Entry<K,V>> transformer,
4774	<	double basis,
4775	<	DoubleByDoubleToDouble reducer) {
4776	<	if (transformer == null || reducer == null)
4777	<	throw new NullPointerException();
4778	<	return new MapReduceEntriesToDoubleTask<K,V>
4779	<	(map, null, -1, null, transformer, basis, reducer);
4428	>	public final boolean add(V e) {
4429	>	throw new UnsupportedOperationException();
4430	>	}
4431	>	public final boolean addAll(Collection<? extends V> c) {
4432	>	throw new UnsupportedOperationException();
4433		}
4434
4435	<	/**
4436	<	* Returns a task that when invoked, returns the result of
4437	<	* accumulating the given transformation of all entries using the
4438	<	* given reducer to combine values, and the given basis as an
4439	<	* identity value.
4440	<	*
4788	<	* @param map the map
4789	<	* @param transformer a function returning the transformation
4790	<	* for an element
4791	<	* @param basis the identity (initial default value) for the reduction
4792	<	* @param reducer a commutative associative combining function
4793	<	* @return the task
4794	<	*/
4795	<	public static <K,V> ForkJoinTask<Long> reduceEntriesToLong
4796	<	(ConcurrentHashMapV8<K,V> map,
4797	<	ObjectToLong<Map.Entry<K,V>> transformer,
4798	<	long basis,
4799	<	LongByLongToLong reducer) {
4800	<	if (transformer == null || reducer == null)
4801	<	throw new NullPointerException();
4802	<	return new MapReduceEntriesToLongTask<K,V>
4803	<	(map, null, -1, null, transformer, basis, reducer);
4435	>	public ConcurrentHashMapSpliterator<V> spliterator() {
4436	>	Node<K,V>[] t;
4437	>	ConcurrentHashMapV8<K,V> m = map;
4438	>	long n = m.sumCount();
4439	>	int f = (t = m.table) == null ? 0 : t.length;
4440	>	return new ValueSpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4441		}
4442
4443	<	/**
4444	<	* Returns a task that when invoked, returns the result of
4445	<	* accumulating the given transformation of all entries using the
4446	<	* given reducer to combine values, and the given basis as an
4447	<	* identity value.
4448	<	*
4449	<	* @param map the map
4450	<	* @param transformer a function returning the transformation
4814	<	* for an element
4815	<	* @param basis the identity (initial default value) for the reduction
4816	<	* @param reducer a commutative associative combining function
4817	<	* @return the task
4818	<	*/
4819	<	public static <K,V> ForkJoinTask<Integer> reduceEntriesToInt
4820	<	(ConcurrentHashMapV8<K,V> map,
4821	<	ObjectToInt<Map.Entry<K,V>> transformer,
4822	<	int basis,
4823	<	IntByIntToInt reducer) {
4824	<	if (transformer == null || reducer == null)
4825	<	throw new NullPointerException();
4826	<	return new MapReduceEntriesToIntTask<K,V>
4827	<	(map, null, -1, null, transformer, basis, reducer);
4443	>	public void forEach(Action<? super V> action) {
4444	>	if (action == null) throw new NullPointerException();
4445	>	Node<K,V>[] t;
4446	>	if ((t = map.table) != null) {
4447	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4448	>	for (Node<K,V> p; (p = it.advance()) != null; )
4449	>	action.apply(p.val);
4450	>	}
4451		}
4452		}
4453
4831	–	// -------------------------------------------------------
4832	–
4454		/**
4455	<	* Base for FJ tasks for bulk operations. This adds a variant of
4456	<	* CountedCompleters and some split and merge bookkeeping to
4457	<	* iterator functionality. The forEach and reduce methods are
4458	<	* similar to those illustrated in CountedCompleter documentation,
4459	<	* except that bottom-up reduction completions perform them within
4460	<	* their compute methods. The search methods are like forEach
4461	<	* except they continually poll for success and exit early.  Also,
4462	<	* exceptions are handled in a simpler manner, by just trying to
4842	<	* complete root task exceptionally.
4843	<	*/
4844	<	@SuppressWarnings("serial") static abstract class BulkTask<K,V,R> extends Traverser<K,V,R> {
4845	<	final BulkTask<K,V,?> parent;  // completion target
4846	<	int batch;                     // split control; -1 for unknown
4847	<	int pending;                   // completion control
4455	>	* A view of a ConcurrentHashMapV8 as a {@link Set} of (key, value)
4456	>	* entries.  This class cannot be directly instantiated. See
4457	>	* {@link #entrySet()}.
4458	>	*/
4459	>	static final class EntrySetView<K,V> extends CollectionView<K,V,Map.Entry<K,V>>
4460	>	implements Set<Map.Entry<K,V>>, java.io.Serializable {
4461	>	private static final long serialVersionUID = 2249069246763182397L;
4462	>	EntrySetView(ConcurrentHashMapV8<K,V> map) { super(map); }
4463
4464	<	BulkTask(ConcurrentHashMapV8<K,V> map, BulkTask<K,V,?> parent,
4465	<	int batch) {
4466	<	super(map);
4467	<	this.parent = parent;
4468	<	this.batch = batch;
4469	<	if (parent != null && map != null) { // split parent
4470	<	Node[] t;
4856	<	if ((t = parent.tab) == null &&
4857	<	(t = parent.tab = map.table) != null)
4858	<	parent.baseLimit = parent.baseSize = t.length;
4859	<	this.tab = t;
4860	<	this.baseSize = parent.baseSize;
4861	<	int hi = this.baseLimit = parent.baseLimit;
4862	<	parent.baseLimit = this.index = this.baseIndex =
4863	<	(hi + parent.baseIndex + 1) >>> 1;
4864	<	}
4464	>	public boolean contains(Object o) {
4465	>	Object k, v, r; Map.Entry<?,?> e;
4466	>	return ((o instanceof Map.Entry) &&
4467	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
4468	>	(r = map.get(k)) != null &&
4469	>	(v = e.getValue()) != null &&
4470	>	(v == r || v.equals(r)));
4471		}
4472
4473	<	// FJ methods
4473	>	public boolean remove(Object o) {
4474	>	Object k, v; Map.Entry<?,?> e;
4475	>	return ((o instanceof Map.Entry) &&
4476	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
4477	>	(v = e.getValue()) != null &&
4478	>	map.remove(k, v));
4479	>	}
4480
4481		/**
4482	<	* Propagates completion. Note that all reduce actions
4871	<	* bypass this method to combine while completing.
4482	>	* @return an iterator over the entries of the backing map
4483		*/
4484	<	final void tryComplete() {
4485	<	BulkTask<K,V,?> a = this, s = a;
4486	<	for (int c;;) {
4487	<	if ((c = a.pending) == 0) {
4488	<	if ((a = (s = a).parent) == null) {
4489	<	s.quietlyComplete();
4490	<	break;
4491	<	}
4492	<	}
4493	<	else if (U.compareAndSwapInt(a, PENDING, c, c - 1))
4494	<	break;
4484	>	public Iterator<Map.Entry<K,V>> iterator() {
4485	>	ConcurrentHashMapV8<K,V> m = map;
4486	>	Node<K,V>[] t;
4487	>	int f = (t = m.table) == null ? 0 : t.length;
4488	>	return new EntryIterator<K,V>(t, f, 0, f, m);
4489	>	}
4490	>
4491	>	public boolean add(Entry<K,V> e) {
4492	>	return map.putVal(e.getKey(), e.getValue(), false) == null;
4493	>	}
4494	>
4495	>	public boolean addAll(Collection<? extends Entry<K,V>> c) {
4496	>	boolean added = false;
4497	>	for (Entry<K,V> e : c) {
4498	>	if (add(e))
4499	>	added = true;
4500		}
4501	+	return added;
4502		}
4503
4504	<	/**
4505	<	* Forces root task to complete.
4506	<	* @param ex if null, complete normally, else exceptionally
4507	<	* @return false to simplify use
4508	<	*/
4509	<	final boolean tryCompleteComputation(Throwable ex) {
4510	<	for (BulkTask<K,V,?> a = this;;) {
4894	<	BulkTask<K,V,?> p = a.parent;
4895	<	if (p == null) {
4896	<	if (ex != null)
4897	<	a.completeExceptionally(ex);
4898	<	else
4899	<	a.quietlyComplete();
4900	<	return false;
4504	>	public final int hashCode() {
4505	>	int h = 0;
4506	>	Node<K,V>[] t;
4507	>	if ((t = map.table) != null) {
4508	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4509	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
4510	>	h += p.hashCode();
4511		}
4902	–	a = p;
4512		}
4513	+	return h;
4514		}
4515
4516	<	/**
4517	<	* Version of tryCompleteComputation for function screening checks
4518	<	*/
4519	<	final boolean abortOnNullFunction() {
4520	<	return tryCompleteComputation(new Error("Unexpected null function"));
4516	>	public final boolean equals(Object o) {
4517	>	Set<?> c;
4518	>	return ((o instanceof Set) &&
4519	>	((c = (Set<?>)o) == this ||
4520	>	(containsAll(c) && c.containsAll(this))));
4521		}
4522
4523	<	// utilities
4523	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> spliterator() {
4524	>	Node<K,V>[] t;
4525	>	ConcurrentHashMapV8<K,V> m = map;
4526	>	long n = m.sumCount();
4527	>	int f = (t = m.table) == null ? 0 : t.length;
4528	>	return new EntrySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n, m);
4529	>	}
4530
4531	<	/** CompareAndSet pending count */
4532	<	final boolean casPending(int cmp, int val) {
4533	<	return U.compareAndSwapInt(this, PENDING, cmp, val);
4531	>	public void forEach(Action<? super Map.Entry<K,V>> action) {
4532	>	if (action == null) throw new NullPointerException();
4533	>	Node<K,V>[] t;
4534	>	if ((t = map.table) != null) {
4535	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4536	>	for (Node<K,V> p; (p = it.advance()) != null; )
4537	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
4538	>	}
4539		}
4540
4541	<	/**
4542	<	* Returns approx exp2 of the number of times (minus one) to
4543	<	* split task by two before executing leaf action. This value
4544	<	* is faster to compute and more convenient to use as a guide
4545	<	* to splitting than is the depth, since it is used while
4546	<	* dividing by two anyway.
4547	<	*/
4548	<	final int batch() {
4549	<	ConcurrentHashMapV8<K, V> m; int b; Node[] t;
4550	<	if ((b = batch) < 0 && (m = map) != null) { // force initialization
4551	<	if ((t = tab) == null && (t = tab = m.table) != null)
4552	<	baseLimit = baseSize = t.length;
4553	<	if (t != null) {
4554	<	long n = m.counter.sum();
4555	<	int sp = getPool().getParallelism() << 3; // slack of 8
4556	<	b = batch = (n <= 0L) ? 0 : (n < (long)sp) ? (int)n : sp;
4557	<	}
4541	>	}
4542	>
4543	>	// -------------------------------------------------------
4544	>
4545	>	/**
4546	>	* Base class for bulk tasks. Repeats some fields and code from
4547	>	* class Traverser, because we need to subclass CountedCompleter.
4548	>	*/
4549	>	abstract static class BulkTask<K,V,R> extends CountedCompleter<R> {
4550	>	Node<K,V>[] tab;        // same as Traverser
4551	>	Node<K,V> next;
4552	>	int index;
4553	>	int baseIndex;
4554	>	int baseLimit;
4555	>	final int baseSize;
4556	>	int batch;              // split control
4557	>
4558	>	BulkTask(BulkTask<K,V,?> par, int b, int i, int f, Node<K,V>[] t) {
4559	>	super(par);
4560	>	this.batch = b;
4561	>	this.index = this.baseIndex = i;
4562	>	if ((this.tab = t) == null)
4563	>	this.baseSize = this.baseLimit = 0;
4564	>	else if (par == null)
4565	>	this.baseSize = this.baseLimit = t.length;
4566	>	else {
4567	>	this.baseLimit = f;
4568	>	this.baseSize = par.baseSize;
4569		}
4938	–	return b;
4570		}
4571
4572		/**
4573	<	* Returns exportable snapshot entry.
4573	>	* Same as Traverser version
4574		*/
4575	<	static <K,V> AbstractMap.SimpleEntry<K,V> entryFor(K k, V v) {
4576	<	return new AbstractMap.SimpleEntry<K,V>(k, v);
4577	<	}
4578	<
4579	<	// Unsafe mechanics
4580	<	private static final sun.misc.Unsafe U;
4581	<	private static final long PENDING;
4582	<	static {
4583	<	try {
4584	<	U = getUnsafe();
4585	<	PENDING = U.objectFieldOffset
4586	<	(BulkTask.class.getDeclaredField("pending"));
4587	<	} catch (Exception e) {
4588	<	throw new Error(e);
4575	>	final Node<K,V> advance() {
4576	>	Node<K,V> e;
4577	>	if ((e = next) != null)
4578	>	e = e.next;
4579	>	for (;;) {
4580	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
4581	>	if (e != null)
4582	>	return next = e;
4583	>	if (baseIndex >= baseLimit || (t = tab) == null ||
4584	>	(n = t.length) <= (i = index) || i < 0)
4585	>	return next = null;
4586	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
4587	>	if (e instanceof ForwardingNode) {
4588	>	tab = ((ForwardingNode<K,V>)e).nextTable;
4589	>	e = null;
4590	>	continue;
4591	>	}
4592	>	else if (e instanceof TreeBin)
4593	>	e = ((TreeBin<K,V>)e).first;
4594	>	else
4595	>	e = null;
4596	>	}
4597	>	if ((index += baseSize) >= n)
4598	>	index = ++baseIndex;    // visit upper slots if present
4599		}
4600		}
4601		}
#	Line 4962 | Line 4603 | public class ConcurrentHashMapV8<K, V>
4603		/*
4604		* Task classes. Coded in a regular but ugly format/style to
4605		* simplify checks that each variant differs in the right way from
4606	<	* others.
4606	>	* others. The null screenings exist because compilers cannot tell
4607	>	* that we've already null-checked task arguments, so we force
4608	>	* simplest hoisted bypass to help avoid convoluted traps.
4609		*/
4610	<
4611	<	@SuppressWarnings("serial") static final class ForEachKeyTask<K,V>
4610	>	@SuppressWarnings("serial")
4611	>	static final class ForEachKeyTask<K,V>
4612		extends BulkTask<K,V,Void> {
4613	<	final Action<K> action;
4613	>	final Action<? super K> action;
4614		ForEachKeyTask
4615	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4616	<	Action<K> action) {
4617	<	super(m, p, b);
4615	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4616	>	Action<? super K> action) {
4617	>	super(p, b, i, f, t);
4618		this.action = action;
4619		}
4620	<	@SuppressWarnings("unchecked") public final boolean exec() {
4621	<	final Action<K> action = this.action;
4622	<	if (action == null)
4623	<	return abortOnNullFunction();
4624	<	try {
4625	<	int b = batch(), c;
4626	<	while (b > 1 && baseIndex != baseLimit) {
4627	<	do {} while (!casPending(c = pending, c+1));
4628	<	new ForEachKeyTask<K,V>(map, this, b >>>= 1, action).fork();
4629	<	}
4630	<	while (advance() != null)
4631	<	action.apply((K)nextKey);
4632	<	tryComplete();
4990	<	} catch (Throwable ex) {
4991	<	return tryCompleteComputation(ex);
4620	>	public final void compute() {
4621	>	final Action<? super K> action;
4622	>	if ((action = this.action) != null) {
4623	>	for (int i = baseIndex, f, h; batch > 0 &&
4624	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4625	>	addToPendingCount(1);
4626	>	new ForEachKeyTask<K,V>
4627	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4628	>	action).fork();
4629	>	}
4630	>	for (Node<K,V> p; (p = advance()) != null;)
4631	>	action.apply(p.key);
4632	>	propagateCompletion();
4633		}
4993	–	return false;
4634		}
4635		}
4636
4637	<	@SuppressWarnings("serial") static final class ForEachValueTask<K,V>
4637	>	@SuppressWarnings("serial")
4638	>	static final class ForEachValueTask<K,V>
4639		extends BulkTask<K,V,Void> {
4640	<	final Action<V> action;
4640	>	final Action<? super V> action;
4641		ForEachValueTask
4642	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4643	<	Action<V> action) {
4644	<	super(m, p, b);
4642	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4643	>	Action<? super V> action) {
4644	>	super(p, b, i, f, t);
4645		this.action = action;
4646		}
4647	<	@SuppressWarnings("unchecked") public final boolean exec() {
4648	<	final Action<V> action = this.action;
4649	<	if (action == null)
4650	<	return abortOnNullFunction();
4651	<	try {
4652	<	int b = batch(), c;
4653	<	while (b > 1 && baseIndex != baseLimit) {
4654	<	do {} while (!casPending(c = pending, c+1));
4655	<	new ForEachValueTask<K,V>(map, this, b >>>= 1, action).fork();
4656	<	}
4657	<	Object v;
4658	<	while ((v = advance()) != null)
4659	<	action.apply((V)v);
5019	<	tryComplete();
5020	<	} catch (Throwable ex) {
5021	<	return tryCompleteComputation(ex);
4647	>	public final void compute() {
4648	>	final Action<? super V> action;
4649	>	if ((action = this.action) != null) {
4650	>	for (int i = baseIndex, f, h; batch > 0 &&
4651	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4652	>	addToPendingCount(1);
4653	>	new ForEachValueTask<K,V>
4654	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4655	>	action).fork();
4656	>	}
4657	>	for (Node<K,V> p; (p = advance()) != null;)
4658	>	action.apply(p.val);
4659	>	propagateCompletion();
4660		}
5023	–	return false;
4661		}
4662		}
4663
4664	<	@SuppressWarnings("serial") static final class ForEachEntryTask<K,V>
4664	>	@SuppressWarnings("serial")
4665	>	static final class ForEachEntryTask<K,V>
4666		extends BulkTask<K,V,Void> {
4667	<	final Action<Entry<K,V>> action;
4667	>	final Action<? super Entry<K,V>> action;
4668		ForEachEntryTask
4669	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4670	<	Action<Entry<K,V>> action) {
4671	<	super(m, p, b);
4669	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4670	>	Action<? super Entry<K,V>> action) {
4671	>	super(p, b, i, f, t);
4672		this.action = action;
4673		}
4674	<	@SuppressWarnings("unchecked") public final boolean exec() {
4675	<	final Action<Entry<K,V>> action = this.action;
4676	<	if (action == null)
4677	<	return abortOnNullFunction();
4678	<	try {
4679	<	int b = batch(), c;
4680	<	while (b > 1 && baseIndex != baseLimit) {
4681	<	do {} while (!casPending(c = pending, c+1));
4682	<	new ForEachEntryTask<K,V>(map, this, b >>>= 1, action).fork();
4683	<	}
4684	<	Object v;
4685	<	while ((v = advance()) != null)
4686	<	action.apply(entryFor((K)nextKey, (V)v));
5049	<	tryComplete();
5050	<	} catch (Throwable ex) {
5051	<	return tryCompleteComputation(ex);
4674	>	public final void compute() {
4675	>	final Action<? super Entry<K,V>> action;
4676	>	if ((action = this.action) != null) {
4677	>	for (int i = baseIndex, f, h; batch > 0 &&
4678	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4679	>	addToPendingCount(1);
4680	>	new ForEachEntryTask<K,V>
4681	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4682	>	action).fork();
4683	>	}
4684	>	for (Node<K,V> p; (p = advance()) != null; )
4685	>	action.apply(p);
4686	>	propagateCompletion();
4687		}
5053	–	return false;
4688		}
4689		}
4690
4691	<	@SuppressWarnings("serial") static final class ForEachMappingTask<K,V>
4691	>	@SuppressWarnings("serial")
4692	>	static final class ForEachMappingTask<K,V>
4693		extends BulkTask<K,V,Void> {
4694	<	final BiAction<K,V> action;
4694	>	final BiAction<? super K, ? super V> action;
4695		ForEachMappingTask
4696	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4697	<	BiAction<K,V> action) {
4698	<	super(m, p, b);
4696	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4697	>	BiAction<? super K,? super V> action) {
4698	>	super(p, b, i, f, t);
4699		this.action = action;
4700		}
4701	<	@SuppressWarnings("unchecked") public final boolean exec() {
4702	<	final BiAction<K,V> action = this.action;
4703	<	if (action == null)
4704	<	return abortOnNullFunction();
4705	<	try {
4706	<	int b = batch(), c;
4707	<	while (b > 1 && baseIndex != baseLimit) {
4708	<	do {} while (!casPending(c = pending, c+1));
4709	<	new ForEachMappingTask<K,V>(map, this, b >>>= 1,
4710	<	action).fork();
4711	<	}
4712	<	Object v;
4713	<	while ((v = advance()) != null)
5079	<	action.apply((K)nextKey, (V)v);
5080	<	tryComplete();
5081	<	} catch (Throwable ex) {
5082	<	return tryCompleteComputation(ex);
4701	>	public final void compute() {
4702	>	final BiAction<? super K, ? super V> action;
4703	>	if ((action = this.action) != null) {
4704	>	for (int i = baseIndex, f, h; batch > 0 &&
4705	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4706	>	addToPendingCount(1);
4707	>	new ForEachMappingTask<K,V>
4708	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4709	>	action).fork();
4710	>	}
4711	>	for (Node<K,V> p; (p = advance()) != null; )
4712	>	action.apply(p.key, p.val);
4713	>	propagateCompletion();
4714		}
5084	–	return false;
4715		}
4716		}
4717
4718	<	@SuppressWarnings("serial") static final class ForEachTransformedKeyTask<K,V,U>
4718	>	@SuppressWarnings("serial")
4719	>	static final class ForEachTransformedKeyTask<K,V,U>
4720		extends BulkTask<K,V,Void> {
4721		final Fun<? super K, ? extends U> transformer;
4722	<	final Action<U> action;
4722	>	final Action<? super U> action;
4723		ForEachTransformedKeyTask
4724	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4725	<	Fun<? super K, ? extends U> transformer,
4726	<	Action<U> action) {
4727	<	super(m, p, b);
4728	<	this.transformer = transformer;
4729	<	this.action = action;
4730	<
4731	<	}
4732	<	@SuppressWarnings("unchecked") public final boolean exec() {
4733	<	final Fun<? super K, ? extends U> transformer =
4734	<	this.transformer;
4735	<	final Action<U> action = this.action;
4736	<	if (transformer == null || action == null)
5106	<	return abortOnNullFunction();
5107	<	try {
5108	<	int b = batch(), c;
5109	<	while (b > 1 && baseIndex != baseLimit) {
5110	<	do {} while (!casPending(c = pending, c+1));
4724	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4725	>	Fun<? super K, ? extends U> transformer, Action<? super U> action) {
4726	>	super(p, b, i, f, t);
4727	>	this.transformer = transformer; this.action = action;
4728	>	}
4729	>	public final void compute() {
4730	>	final Fun<? super K, ? extends U> transformer;
4731	>	final Action<? super U> action;
4732	>	if ((transformer = this.transformer) != null &&
4733	>	(action = this.action) != null) {
4734	>	for (int i = baseIndex, f, h; batch > 0 &&
4735	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4736	>	addToPendingCount(1);
4737		new ForEachTransformedKeyTask<K,V,U>
4738	<	(map, this, b >>>= 1, transformer, action).fork();
4738	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4739	>	transformer, action).fork();
4740		}
4741	<	U u;
4742	<	while (advance() != null) {
4743	<	if ((u = transformer.apply((K)nextKey)) != null)
4741	>	for (Node<K,V> p; (p = advance()) != null; ) {
4742	>	U u;
4743	>	if ((u = transformer.apply(p.key)) != null)
4744		action.apply(u);
4745		}
4746	<	tryComplete();
5120	<	} catch (Throwable ex) {
5121	<	return tryCompleteComputation(ex);
4746	>	propagateCompletion();
4747		}
5123	–	return false;
4748		}
4749		}
4750
4751	<	@SuppressWarnings("serial") static final class ForEachTransformedValueTask<K,V,U>
4751	>	@SuppressWarnings("serial")
4752	>	static final class ForEachTransformedValueTask<K,V,U>
4753		extends BulkTask<K,V,Void> {
4754		final Fun<? super V, ? extends U> transformer;
4755	<	final Action<U> action;
4755	>	final Action<? super U> action;
4756		ForEachTransformedValueTask
4757	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4758	<	Fun<? super V, ? extends U> transformer,
4759	<	Action<U> action) {
4760	<	super(m, p, b);
4761	<	this.transformer = transformer;
4762	<	this.action = action;
4763	<
4764	<	}
4765	<	@SuppressWarnings("unchecked") public final boolean exec() {
4766	<	final Fun<? super V, ? extends U> transformer =
4767	<	this.transformer;
4768	<	final Action<U> action = this.action;
4769	<	if (transformer == null || action == null)
5145	<	return abortOnNullFunction();
5146	<	try {
5147	<	int b = batch(), c;
5148	<	while (b > 1 && baseIndex != baseLimit) {
5149	<	do {} while (!casPending(c = pending, c+1));
4757	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4758	>	Fun<? super V, ? extends U> transformer, Action<? super U> action) {
4759	>	super(p, b, i, f, t);
4760	>	this.transformer = transformer; this.action = action;
4761	>	}
4762	>	public final void compute() {
4763	>	final Fun<? super V, ? extends U> transformer;
4764	>	final Action<? super U> action;
4765	>	if ((transformer = this.transformer) != null &&
4766	>	(action = this.action) != null) {
4767	>	for (int i = baseIndex, f, h; batch > 0 &&
4768	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4769	>	addToPendingCount(1);
4770		new ForEachTransformedValueTask<K,V,U>
4771	<	(map, this, b >>>= 1, transformer, action).fork();
4771	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4772	>	transformer, action).fork();
4773		}
4774	<	Object v; U u;
4775	<	while ((v = advance()) != null) {
4776	<	if ((u = transformer.apply((V)v)) != null)
4774	>	for (Node<K,V> p; (p = advance()) != null; ) {
4775	>	U u;
4776	>	if ((u = transformer.apply(p.val)) != null)
4777		action.apply(u);
4778		}
4779	<	tryComplete();
5159	<	} catch (Throwable ex) {
5160	<	return tryCompleteComputation(ex);
4779	>	propagateCompletion();
4780		}
5162	–	return false;
4781		}
4782		}
4783
4784	<	@SuppressWarnings("serial") static final class ForEachTransformedEntryTask<K,V,U>
4784	>	@SuppressWarnings("serial")
4785	>	static final class ForEachTransformedEntryTask<K,V,U>
4786		extends BulkTask<K,V,Void> {
4787		final Fun<Map.Entry<K,V>, ? extends U> transformer;
4788	<	final Action<U> action;
4788	>	final Action<? super U> action;
4789		ForEachTransformedEntryTask
4790	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4791	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
4792	<	Action<U> action) {
4793	<	super(m, p, b);
4794	<	this.transformer = transformer;
4795	<	this.action = action;
4796	<
4797	<	}
4798	<	@SuppressWarnings("unchecked") public final boolean exec() {
4799	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
4800	<	this.transformer;
4801	<	final Action<U> action = this.action;
4802	<	if (transformer == null || action == null)
5184	<	return abortOnNullFunction();
5185	<	try {
5186	<	int b = batch(), c;
5187	<	while (b > 1 && baseIndex != baseLimit) {
5188	<	do {} while (!casPending(c = pending, c+1));
4790	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4791	>	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<? super U> action) {
4792	>	super(p, b, i, f, t);
4793	>	this.transformer = transformer; this.action = action;
4794	>	}
4795	>	public final void compute() {
4796	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
4797	>	final Action<? super U> action;
4798	>	if ((transformer = this.transformer) != null &&
4799	>	(action = this.action) != null) {
4800	>	for (int i = baseIndex, f, h; batch > 0 &&
4801	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4802	>	addToPendingCount(1);
4803		new ForEachTransformedEntryTask<K,V,U>
4804	<	(map, this, b >>>= 1, transformer, action).fork();
4804	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4805	>	transformer, action).fork();
4806		}
4807	<	Object v; U u;
4808	<	while ((v = advance()) != null) {
4809	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
4807	>	for (Node<K,V> p; (p = advance()) != null; ) {
4808	>	U u;
4809	>	if ((u = transformer.apply(p)) != null)
4810		action.apply(u);
4811		}
4812	<	tryComplete();
5198	<	} catch (Throwable ex) {
5199	<	return tryCompleteComputation(ex);
4812	>	propagateCompletion();
4813		}
5201	–	return false;
4814		}
4815		}
4816
4817	<	@SuppressWarnings("serial") static final class ForEachTransformedMappingTask<K,V,U>
4817	>	@SuppressWarnings("serial")
4818	>	static final class ForEachTransformedMappingTask<K,V,U>
4819		extends BulkTask<K,V,Void> {
4820		final BiFun<? super K, ? super V, ? extends U> transformer;
4821	<	final Action<U> action;
4821	>	final Action<? super U> action;
4822		ForEachTransformedMappingTask
4823	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4823	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4824		BiFun<? super K, ? super V, ? extends U> transformer,
4825	<	Action<U> action) {
4826	<	super(m, p, b);
4827	<	this.transformer = transformer;
4828	<	this.action = action;
4829	<
4830	<	}
4831	<	@SuppressWarnings("unchecked") public final boolean exec() {
4832	<	final BiFun<? super K, ? super V, ? extends U> transformer =
4833	<	this.transformer;
4834	<	final Action<U> action = this.action;
4835	<	if (transformer == null || action == null)
4836	<	return abortOnNullFunction();
5224	<	try {
5225	<	int b = batch(), c;
5226	<	while (b > 1 && baseIndex != baseLimit) {
5227	<	do {} while (!casPending(c = pending, c+1));
4825	>	Action<? super U> action) {
4826	>	super(p, b, i, f, t);
4827	>	this.transformer = transformer; this.action = action;
4828	>	}
4829	>	public final void compute() {
4830	>	final BiFun<? super K, ? super V, ? extends U> transformer;
4831	>	final Action<? super U> action;
4832	>	if ((transformer = this.transformer) != null &&
4833	>	(action = this.action) != null) {
4834	>	for (int i = baseIndex, f, h; batch > 0 &&
4835	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4836	>	addToPendingCount(1);
4837		new ForEachTransformedMappingTask<K,V,U>
4838	<	(map, this, b >>>= 1, transformer, action).fork();
4838	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4839	>	transformer, action).fork();
4840		}
4841	<	Object v; U u;
4842	<	while ((v = advance()) != null) {
4843	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
4841	>	for (Node<K,V> p; (p = advance()) != null; ) {
4842	>	U u;
4843	>	if ((u = transformer.apply(p.key, p.val)) != null)
4844		action.apply(u);
4845		}
4846	<	tryComplete();
5237	<	} catch (Throwable ex) {
5238	<	return tryCompleteComputation(ex);
4846	>	propagateCompletion();
4847		}
5240	–	return false;
4848		}
4849		}
4850
4851	<	@SuppressWarnings("serial") static final class SearchKeysTask<K,V,U>
4851	>	@SuppressWarnings("serial")
4852	>	static final class SearchKeysTask<K,V,U>
4853		extends BulkTask<K,V,U> {
4854		final Fun<? super K, ? extends U> searchFunction;
4855		final AtomicReference<U> result;
4856		SearchKeysTask
4857	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4857	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4858		Fun<? super K, ? extends U> searchFunction,
4859		AtomicReference<U> result) {
4860	<	super(m, p, b);
4860	>	super(p, b, i, f, t);
4861		this.searchFunction = searchFunction; this.result = result;
4862		}
4863	<	@SuppressWarnings("unchecked") public final boolean exec() {
4864	<	AtomicReference<U> result = this.result;
4865	<	final Fun<? super K, ? extends U> searchFunction =
4866	<	this.searchFunction;
4867	<	if (searchFunction == null || result == null)
4868	<	return abortOnNullFunction();
4869	<	try {
4870	<	int b = batch(), c;
4871	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
4872	<	do {} while (!casPending(c = pending, c+1));
4873	<	new SearchKeysTask<K,V,U>(map, this, b >>>= 1,
4874	<	searchFunction, result).fork();
4875	<	}
4876	<	U u;
4877	<	while (result.get() == null && advance() != null) {
4878	<	if ((u = searchFunction.apply((K)nextKey)) != null) {
4863	>	public final U getRawResult() { return result.get(); }
4864	>	public final void compute() {
4865	>	final Fun<? super K, ? extends U> searchFunction;
4866	>	final AtomicReference<U> result;
4867	>	if ((searchFunction = this.searchFunction) != null &&
4868	>	(result = this.result) != null) {
4869	>	for (int i = baseIndex, f, h; batch > 0 &&
4870	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4871	>	if (result.get() != null)
4872	>	return;
4873	>	addToPendingCount(1);
4874	>	new SearchKeysTask<K,V,U>
4875	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4876	>	searchFunction, result).fork();
4877	>	}
4878	>	while (result.get() == null) {
4879	>	U u;
4880	>	Node<K,V> p;
4881	>	if ((p = advance()) == null) {
4882	>	propagateCompletion();
4883	>	break;
4884	>	}
4885	>	if ((u = searchFunction.apply(p.key)) != null) {
4886		if (result.compareAndSet(null, u))
4887	<	tryCompleteComputation(null);
4887	>	quietlyCompleteRoot();
4888		break;
4889		}
4890		}
5276	–	tryComplete();
5277	–	} catch (Throwable ex) {
5278	–	return tryCompleteComputation(ex);
4891		}
5280	–	return false;
4892		}
5282	–	public final U getRawResult() { return result.get(); }
4893		}
4894
4895	<	@SuppressWarnings("serial") static final class SearchValuesTask<K,V,U>
4895	>	@SuppressWarnings("serial")
4896	>	static final class SearchValuesTask<K,V,U>
4897		extends BulkTask<K,V,U> {
4898		final Fun<? super V, ? extends U> searchFunction;
4899		final AtomicReference<U> result;
4900		SearchValuesTask
4901	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4901	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4902		Fun<? super V, ? extends U> searchFunction,
4903		AtomicReference<U> result) {
4904	<	super(m, p, b);
4904	>	super(p, b, i, f, t);
4905		this.searchFunction = searchFunction; this.result = result;
4906		}
4907	<	@SuppressWarnings("unchecked") public final boolean exec() {
4908	<	AtomicReference<U> result = this.result;
4909	<	final Fun<? super V, ? extends U> searchFunction =
4910	<	this.searchFunction;
4911	<	if (searchFunction == null || result == null)
4912	<	return abortOnNullFunction();
4913	<	try {
4914	<	int b = batch(), c;
4915	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
4916	<	do {} while (!casPending(c = pending, c+1));
4917	<	new SearchValuesTask<K,V,U>(map, this, b >>>= 1,
4918	<	searchFunction, result).fork();
4919	<	}
4920	<	Object v; U u;
4921	<	while (result.get() == null && (v = advance()) != null) {
4922	<	if ((u = searchFunction.apply((V)v)) != null) {
4907	>	public final U getRawResult() { return result.get(); }
4908	>	public final void compute() {
4909	>	final Fun<? super V, ? extends U> searchFunction;
4910	>	final AtomicReference<U> result;
4911	>	if ((searchFunction = this.searchFunction) != null &&
4912	>	(result = this.result) != null) {
4913	>	for (int i = baseIndex, f, h; batch > 0 &&
4914	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4915	>	if (result.get() != null)
4916	>	return;
4917	>	addToPendingCount(1);
4918	>	new SearchValuesTask<K,V,U>
4919	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4920	>	searchFunction, result).fork();
4921	>	}
4922	>	while (result.get() == null) {
4923	>	U u;
4924	>	Node<K,V> p;
4925	>	if ((p = advance()) == null) {
4926	>	propagateCompletion();
4927	>	break;
4928	>	}
4929	>	if ((u = searchFunction.apply(p.val)) != null) {
4930		if (result.compareAndSet(null, u))
4931	<	tryCompleteComputation(null);
4931	>	quietlyCompleteRoot();
4932		break;
4933		}
4934		}
5317	–	tryComplete();
5318	–	} catch (Throwable ex) {
5319	–	return tryCompleteComputation(ex);
4935		}
5321	–	return false;
4936		}
5323	–	public final U getRawResult() { return result.get(); }
4937		}
4938
4939	<	@SuppressWarnings("serial") static final class SearchEntriesTask<K,V,U>
4939	>	@SuppressWarnings("serial")
4940	>	static final class SearchEntriesTask<K,V,U>
4941		extends BulkTask<K,V,U> {
4942		final Fun<Entry<K,V>, ? extends U> searchFunction;
4943		final AtomicReference<U> result;
4944		SearchEntriesTask
4945	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4945	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4946		Fun<Entry<K,V>, ? extends U> searchFunction,
4947		AtomicReference<U> result) {
4948	<	super(m, p, b);
4948	>	super(p, b, i, f, t);
4949		this.searchFunction = searchFunction; this.result = result;
4950		}
4951	<	@SuppressWarnings("unchecked") public final boolean exec() {
4952	<	AtomicReference<U> result = this.result;
4953	<	final Fun<Entry<K,V>, ? extends U> searchFunction =
4954	<	this.searchFunction;
4955	<	if (searchFunction == null || result == null)
4956	<	return abortOnNullFunction();
4957	<	try {
4958	<	int b = batch(), c;
4959	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
4960	<	do {} while (!casPending(c = pending, c+1));
4961	<	new SearchEntriesTask<K,V,U>(map, this, b >>>= 1,
4962	<	searchFunction, result).fork();
4963	<	}
4964	<	Object v; U u;
4965	<	while (result.get() == null && (v = advance()) != null) {
4966	<	if ((u = searchFunction.apply(entryFor((K)nextKey, (V)v))) != null) {
4967	<	if (result.compareAndSet(null, u))
4968	<	tryCompleteComputation(null);
4951	>	public final U getRawResult() { return result.get(); }
4952	>	public final void compute() {
4953	>	final Fun<Entry<K,V>, ? extends U> searchFunction;
4954	>	final AtomicReference<U> result;
4955	>	if ((searchFunction = this.searchFunction) != null &&
4956	>	(result = this.result) != null) {
4957	>	for (int i = baseIndex, f, h; batch > 0 &&
4958	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4959	>	if (result.get() != null)
4960	>	return;
4961	>	addToPendingCount(1);
4962	>	new SearchEntriesTask<K,V,U>
4963	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4964	>	searchFunction, result).fork();
4965	>	}
4966	>	while (result.get() == null) {
4967	>	U u;
4968	>	Node<K,V> p;
4969	>	if ((p = advance()) == null) {
4970	>	propagateCompletion();
4971		break;
4972		}
4973	+	if ((u = searchFunction.apply(p)) != null) {
4974	+	if (result.compareAndSet(null, u))
4975	+	quietlyCompleteRoot();
4976	+	return;
4977	+	}
4978		}
5358	–	tryComplete();
5359	–	} catch (Throwable ex) {
5360	–	return tryCompleteComputation(ex);
4979		}
5362	–	return false;
4980		}
5364	–	public final U getRawResult() { return result.get(); }
4981		}
4982
4983	<	@SuppressWarnings("serial") static final class SearchMappingsTask<K,V,U>
4983	>	@SuppressWarnings("serial")
4984	>	static final class SearchMappingsTask<K,V,U>
4985		extends BulkTask<K,V,U> {
4986		final BiFun<? super K, ? super V, ? extends U> searchFunction;
4987		final AtomicReference<U> result;
4988		SearchMappingsTask
4989	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4989	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4990		BiFun<? super K, ? super V, ? extends U> searchFunction,
4991		AtomicReference<U> result) {
4992	<	super(m, p, b);
4992	>	super(p, b, i, f, t);
4993		this.searchFunction = searchFunction; this.result = result;
4994		}
4995	<	@SuppressWarnings("unchecked") public final boolean exec() {
4996	<	AtomicReference<U> result = this.result;
4997	<	final BiFun<? super K, ? super V, ? extends U> searchFunction =
4998	<	this.searchFunction;
4999	<	if (searchFunction == null || result == null)
5000	<	return abortOnNullFunction();
5001	<	try {
5002	<	int b = batch(), c;
5003	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5004	<	do {} while (!casPending(c = pending, c+1));
5005	<	new SearchMappingsTask<K,V,U>(map, this, b >>>= 1,
5006	<	searchFunction, result).fork();
5007	<	}
5008	<	Object v; U u;
5009	<	while (result.get() == null && (v = advance()) != null) {
5010	<	if ((u = searchFunction.apply((K)nextKey, (V)v)) != null) {
4995	>	public final U getRawResult() { return result.get(); }
4996	>	public final void compute() {
4997	>	final BiFun<? super K, ? super V, ? extends U> searchFunction;
4998	>	final AtomicReference<U> result;
4999	>	if ((searchFunction = this.searchFunction) != null &&
5000	>	(result = this.result) != null) {
5001	>	for (int i = baseIndex, f, h; batch > 0 &&
5002	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5003	>	if (result.get() != null)
5004	>	return;
5005	>	addToPendingCount(1);
5006	>	new SearchMappingsTask<K,V,U>
5007	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5008	>	searchFunction, result).fork();
5009	>	}
5010	>	while (result.get() == null) {
5011	>	U u;
5012	>	Node<K,V> p;
5013	>	if ((p = advance()) == null) {
5014	>	propagateCompletion();
5015	>	break;
5016	>	}
5017	>	if ((u = searchFunction.apply(p.key, p.val)) != null) {
5018		if (result.compareAndSet(null, u))
5019	<	tryCompleteComputation(null);
5019	>	quietlyCompleteRoot();
5020		break;
5021		}
5022		}
5399	–	tryComplete();
5400	–	} catch (Throwable ex) {
5401	–	return tryCompleteComputation(ex);
5023		}
5403	–	return false;
5024		}
5405	–	public final U getRawResult() { return result.get(); }
5025		}
5026
5027	<	@SuppressWarnings("serial") static final class ReduceKeysTask<K,V>
5027	>	@SuppressWarnings("serial")
5028	>	static final class ReduceKeysTask<K,V>
5029		extends BulkTask<K,V,K> {
5030		final BiFun<? super K, ? super K, ? extends K> reducer;
5031		K result;
5032		ReduceKeysTask<K,V> rights, nextRight;
5033		ReduceKeysTask
5034	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5034	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5035		ReduceKeysTask<K,V> nextRight,
5036		BiFun<? super K, ? super K, ? extends K> reducer) {
5037	<	super(m, p, b); this.nextRight = nextRight;
5037	>	super(p, b, i, f, t); this.nextRight = nextRight;
5038		this.reducer = reducer;
5039		}
5040	<	@SuppressWarnings("unchecked") public final boolean exec() {
5041	<	final BiFun<? super K, ? super K, ? extends K> reducer =
5042	<	this.reducer;
5043	<	if (reducer == null)
5044	<	return abortOnNullFunction();
5045	<	try {
5046	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5427	<	do {} while (!casPending(c = pending, c+1));
5040	>	public final K getRawResult() { return result; }
5041	>	public final void compute() {
5042	>	final BiFun<? super K, ? super K, ? extends K> reducer;
5043	>	if ((reducer = this.reducer) != null) {
5044	>	for (int i = baseIndex, f, h; batch > 0 &&
5045	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5046	>	addToPendingCount(1);
5047		(rights = new ReduceKeysTask<K,V>
5048	<	(map, this, b >>>= 1, rights, reducer)).fork();
5048	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5049	>	rights, reducer)).fork();
5050		}
5051		K r = null;
5052	<	while (advance() != null) {
5053	<	K u = (K)nextKey;
5054	<	r = (r == null) ? u : reducer.apply(r, u);
5052	>	for (Node<K,V> p; (p = advance()) != null; ) {
5053	>	K u = p.key;
5054	>	r = (r == null) ? u : u == null ? r : reducer.apply(r, u);
5055		}
5056		result = r;
5057	<	for (ReduceKeysTask<K,V> t = this, s;;) {
5058	<	int c; BulkTask<K,V,?> par; K tr, sr;
5059	<	if ((c = t.pending) == 0) {
5060	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5061	<	if ((sr = s.result) != null)
5062	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5063	<	}
5064	<	if ((par = t.parent) == null ||
5065	<	!(par instanceof ReduceKeysTask)) {
5066	<	t.quietlyComplete();
5067	<	break;
5448	<	}
5449	<	t = (ReduceKeysTask<K,V>)par;
5057	>	CountedCompleter<?> c;
5058	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5059	>	@SuppressWarnings("unchecked") ReduceKeysTask<K,V>
5060	>	t = (ReduceKeysTask<K,V>)c,
5061	>	s = t.rights;
5062	>	while (s != null) {
5063	>	K tr, sr;
5064	>	if ((sr = s.result) != null)
5065	>	t.result = (((tr = t.result) == null) ? sr :
5066	>	reducer.apply(tr, sr));
5067	>	s = t.rights = s.nextRight;
5068		}
5451	–	else if (t.casPending(c, c - 1))
5452	–	break;
5069		}
5454	–	} catch (Throwable ex) {
5455	–	return tryCompleteComputation(ex);
5070		}
5457	–	return false;
5071		}
5459	–	public final K getRawResult() { return result; }
5072		}
5073
5074	<	@SuppressWarnings("serial") static final class ReduceValuesTask<K,V>
5074	>	@SuppressWarnings("serial")
5075	>	static final class ReduceValuesTask<K,V>
5076		extends BulkTask<K,V,V> {
5077		final BiFun<? super V, ? super V, ? extends V> reducer;
5078		V result;
5079		ReduceValuesTask<K,V> rights, nextRight;
5080		ReduceValuesTask
5081	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5081	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5082		ReduceValuesTask<K,V> nextRight,
5083		BiFun<? super V, ? super V, ? extends V> reducer) {
5084	<	super(m, p, b); this.nextRight = nextRight;
5084	>	super(p, b, i, f, t); this.nextRight = nextRight;
5085		this.reducer = reducer;
5086		}
5087	<	@SuppressWarnings("unchecked") public final boolean exec() {
5088	<	final BiFun<? super V, ? super V, ? extends V> reducer =
5089	<	this.reducer;
5090	<	if (reducer == null)
5091	<	return abortOnNullFunction();
5092	<	try {
5093	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5481	<	do {} while (!casPending(c = pending, c+1));
5087	>	public final V getRawResult() { return result; }
5088	>	public final void compute() {
5089	>	final BiFun<? super V, ? super V, ? extends V> reducer;
5090	>	if ((reducer = this.reducer) != null) {
5091	>	for (int i = baseIndex, f, h; batch > 0 &&
5092	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5093	>	addToPendingCount(1);
5094		(rights = new ReduceValuesTask<K,V>
5095	<	(map, this, b >>>= 1, rights, reducer)).fork();
5095	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5096	>	rights, reducer)).fork();
5097		}
5098		V r = null;
5099	<	Object v;
5100	<	while ((v = advance()) != null) {
5101	<	V u = (V)v;
5489	<	r = (r == null) ? u : reducer.apply(r, u);
5099	>	for (Node<K,V> p; (p = advance()) != null; ) {
5100	>	V v = p.val;
5101	>	r = (r == null) ? v : reducer.apply(r, v);
5102		}
5103		result = r;
5104	<	for (ReduceValuesTask<K,V> t = this, s;;) {
5105	<	int c; BulkTask<K,V,?> par; V tr, sr;
5106	<	if ((c = t.pending) == 0) {
5107	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5108	<	if ((sr = s.result) != null)
5109	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5110	<	}
5111	<	if ((par = t.parent) == null ||
5112	<	!(par instanceof ReduceValuesTask)) {
5113	<	t.quietlyComplete();
5114	<	break;
5503	<	}
5504	<	t = (ReduceValuesTask<K,V>)par;
5104	>	CountedCompleter<?> c;
5105	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5106	>	@SuppressWarnings("unchecked") ReduceValuesTask<K,V>
5107	>	t = (ReduceValuesTask<K,V>)c,
5108	>	s = t.rights;
5109	>	while (s != null) {
5110	>	V tr, sr;
5111	>	if ((sr = s.result) != null)
5112	>	t.result = (((tr = t.result) == null) ? sr :
5113	>	reducer.apply(tr, sr));
5114	>	s = t.rights = s.nextRight;
5115		}
5506	–	else if (t.casPending(c, c - 1))
5507	–	break;
5116		}
5509	–	} catch (Throwable ex) {
5510	–	return tryCompleteComputation(ex);
5117		}
5512	–	return false;
5118		}
5514	–	public final V getRawResult() { return result; }
5119		}
5120
5121	<	@SuppressWarnings("serial") static final class ReduceEntriesTask<K,V>
5121	>	@SuppressWarnings("serial")
5122	>	static final class ReduceEntriesTask<K,V>
5123		extends BulkTask<K,V,Map.Entry<K,V>> {
5124		final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5125		Map.Entry<K,V> result;
5126		ReduceEntriesTask<K,V> rights, nextRight;
5127		ReduceEntriesTask
5128	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5128	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5129		ReduceEntriesTask<K,V> nextRight,
5130		BiFun<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5131	<	super(m, p, b); this.nextRight = nextRight;
5131	>	super(p, b, i, f, t); this.nextRight = nextRight;
5132		this.reducer = reducer;
5133		}
5134	<	@SuppressWarnings("unchecked") public final boolean exec() {
5135	<	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer =
5136	<	this.reducer;
5137	<	if (reducer == null)
5138	<	return abortOnNullFunction();
5139	<	try {
5140	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5536	<	do {} while (!casPending(c = pending, c+1));
5134	>	public final Map.Entry<K,V> getRawResult() { return result; }
5135	>	public final void compute() {
5136	>	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5137	>	if ((reducer = this.reducer) != null) {
5138	>	for (int i = baseIndex, f, h; batch > 0 &&
5139	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5140	>	addToPendingCount(1);
5141		(rights = new ReduceEntriesTask<K,V>
5142	<	(map, this, b >>>= 1, rights, reducer)).fork();
5142	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5143	>	rights, reducer)).fork();
5144		}
5145		Map.Entry<K,V> r = null;
5146	<	Object v;
5147	<	while ((v = advance()) != null) {
5543	<	Map.Entry<K,V> u = entryFor((K)nextKey, (V)v);
5544	<	r = (r == null) ? u : reducer.apply(r, u);
5545	<	}
5146	>	for (Node<K,V> p; (p = advance()) != null; )
5147	>	r = (r == null) ? p : reducer.apply(r, p);
5148		result = r;
5149	<	for (ReduceEntriesTask<K,V> t = this, s;;) {
5150	<	int c; BulkTask<K,V,?> par; Map.Entry<K,V> tr, sr;
5151	<	if ((c = t.pending) == 0) {
5152	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5153	<	if ((sr = s.result) != null)
5154	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5155	<	}
5156	<	if ((par = t.parent) == null ||
5157	<	!(par instanceof ReduceEntriesTask)) {
5158	<	t.quietlyComplete();
5159	<	break;
5558	<	}
5559	<	t = (ReduceEntriesTask<K,V>)par;
5149	>	CountedCompleter<?> c;
5150	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5151	>	@SuppressWarnings("unchecked") ReduceEntriesTask<K,V>
5152	>	t = (ReduceEntriesTask<K,V>)c,
5153	>	s = t.rights;
5154	>	while (s != null) {
5155	>	Map.Entry<K,V> tr, sr;
5156	>	if ((sr = s.result) != null)
5157	>	t.result = (((tr = t.result) == null) ? sr :
5158	>	reducer.apply(tr, sr));
5159	>	s = t.rights = s.nextRight;
5160		}
5561	–	else if (t.casPending(c, c - 1))
5562	–	break;
5161		}
5564	–	} catch (Throwable ex) {
5565	–	return tryCompleteComputation(ex);
5162		}
5567	–	return false;
5163		}
5569	–	public final Map.Entry<K,V> getRawResult() { return result; }
5164		}
5165
5166	<	@SuppressWarnings("serial") static final class MapReduceKeysTask<K,V,U>
5166	>	@SuppressWarnings("serial")
5167	>	static final class MapReduceKeysTask<K,V,U>
5168		extends BulkTask<K,V,U> {
5169		final Fun<? super K, ? extends U> transformer;
5170		final BiFun<? super U, ? super U, ? extends U> reducer;
5171		U result;
5172		MapReduceKeysTask<K,V,U> rights, nextRight;
5173		MapReduceKeysTask
5174	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5174	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5175		MapReduceKeysTask<K,V,U> nextRight,
5176		Fun<? super K, ? extends U> transformer,
5177		BiFun<? super U, ? super U, ? extends U> reducer) {
5178	<	super(m, p, b); this.nextRight = nextRight;
5178	>	super(p, b, i, f, t); this.nextRight = nextRight;
5179		this.transformer = transformer;
5180		this.reducer = reducer;
5181		}
5182	<	@SuppressWarnings("unchecked") public final boolean exec() {
5183	<	final Fun<? super K, ? extends U> transformer =
5184	<	this.transformer;
5185	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5186	<	this.reducer;
5187	<	if (transformer == null || reducer == null)
5188	<	return abortOnNullFunction();
5189	<	try {
5190	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5596	<	do {} while (!casPending(c = pending, c+1));
5182	>	public final U getRawResult() { return result; }
5183	>	public final void compute() {
5184	>	final Fun<? super K, ? extends U> transformer;
5185	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5186	>	if ((transformer = this.transformer) != null &&
5187	>	(reducer = this.reducer) != null) {
5188	>	for (int i = baseIndex, f, h; batch > 0 &&
5189	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5190	>	addToPendingCount(1);
5191		(rights = new MapReduceKeysTask<K,V,U>
5192	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5192	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5193	>	rights, transformer, reducer)).fork();
5194		}
5195	<	U r = null, u;
5196	<	while (advance() != null) {
5197	<	if ((u = transformer.apply((K)nextKey)) != null)
5195	>	U r = null;
5196	>	for (Node<K,V> p; (p = advance()) != null; ) {
5197	>	U u;
5198	>	if ((u = transformer.apply(p.key)) != null)
5199		r = (r == null) ? u : reducer.apply(r, u);
5200		}
5201		result = r;
5202	<	for (MapReduceKeysTask<K,V,U> t = this, s;;) {
5203	<	int c; BulkTask<K,V,?> par; U tr, sr;
5204	<	if ((c = t.pending) == 0) {
5205	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5206	<	if ((sr = s.result) != null)
5207	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5208	<	}
5209	<	if ((par = t.parent) == null ||
5210	<	!(par instanceof MapReduceKeysTask)) {
5211	<	t.quietlyComplete();
5212	<	break;
5617	<	}
5618	<	t = (MapReduceKeysTask<K,V,U>)par;
5202	>	CountedCompleter<?> c;
5203	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5204	>	@SuppressWarnings("unchecked") MapReduceKeysTask<K,V,U>
5205	>	t = (MapReduceKeysTask<K,V,U>)c,
5206	>	s = t.rights;
5207	>	while (s != null) {
5208	>	U tr, sr;
5209	>	if ((sr = s.result) != null)
5210	>	t.result = (((tr = t.result) == null) ? sr :
5211	>	reducer.apply(tr, sr));
5212	>	s = t.rights = s.nextRight;
5213		}
5620	–	else if (t.casPending(c, c - 1))
5621	–	break;
5214		}
5623	–	} catch (Throwable ex) {
5624	–	return tryCompleteComputation(ex);
5215		}
5626	–	return false;
5216		}
5628	–	public final U getRawResult() { return result; }
5217		}
5218
5219	<	@SuppressWarnings("serial") static final class MapReduceValuesTask<K,V,U>
5219	>	@SuppressWarnings("serial")
5220	>	static final class MapReduceValuesTask<K,V,U>
5221		extends BulkTask<K,V,U> {
5222		final Fun<? super V, ? extends U> transformer;
5223		final BiFun<? super U, ? super U, ? extends U> reducer;
5224		U result;
5225		MapReduceValuesTask<K,V,U> rights, nextRight;
5226		MapReduceValuesTask
5227	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5227	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5228		MapReduceValuesTask<K,V,U> nextRight,
5229		Fun<? super V, ? extends U> transformer,
5230		BiFun<? super U, ? super U, ? extends U> reducer) {
5231	<	super(m, p, b); this.nextRight = nextRight;
5231	>	super(p, b, i, f, t); this.nextRight = nextRight;
5232		this.transformer = transformer;
5233		this.reducer = reducer;
5234		}
5235	<	@SuppressWarnings("unchecked") public final boolean exec() {
5236	<	final Fun<? super V, ? extends U> transformer =
5237	<	this.transformer;
5238	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5239	<	this.reducer;
5240	<	if (transformer == null || reducer == null)
5241	<	return abortOnNullFunction();
5242	<	try {
5243	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5655	<	do {} while (!casPending(c = pending, c+1));
5235	>	public final U getRawResult() { return result; }
5236	>	public final void compute() {
5237	>	final Fun<? super V, ? extends U> transformer;
5238	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5239	>	if ((transformer = this.transformer) != null &&
5240	>	(reducer = this.reducer) != null) {
5241	>	for (int i = baseIndex, f, h; batch > 0 &&
5242	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5243	>	addToPendingCount(1);
5244		(rights = new MapReduceValuesTask<K,V,U>
5245	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5245	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5246	>	rights, transformer, reducer)).fork();
5247		}
5248	<	U r = null, u;
5249	<	Object v;
5250	<	while ((v = advance()) != null) {
5251	<	if ((u = transformer.apply((V)v)) != null)
5248	>	U r = null;
5249	>	for (Node<K,V> p; (p = advance()) != null; ) {
5250	>	U u;
5251	>	if ((u = transformer.apply(p.val)) != null)
5252		r = (r == null) ? u : reducer.apply(r, u);
5253		}
5254		result = r;
5255	<	for (MapReduceValuesTask<K,V,U> t = this, s;;) {
5256	<	int c; BulkTask<K,V,?> par; U tr, sr;
5257	<	if ((c = t.pending) == 0) {
5258	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5259	<	if ((sr = s.result) != null)
5260	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5261	<	}
5262	<	if ((par = t.parent) == null ||
5263	<	!(par instanceof MapReduceValuesTask)) {
5264	<	t.quietlyComplete();
5265	<	break;
5677	<	}
5678	<	t = (MapReduceValuesTask<K,V,U>)par;
5255	>	CountedCompleter<?> c;
5256	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5257	>	@SuppressWarnings("unchecked") MapReduceValuesTask<K,V,U>
5258	>	t = (MapReduceValuesTask<K,V,U>)c,
5259	>	s = t.rights;
5260	>	while (s != null) {
5261	>	U tr, sr;
5262	>	if ((sr = s.result) != null)
5263	>	t.result = (((tr = t.result) == null) ? sr :
5264	>	reducer.apply(tr, sr));
5265	>	s = t.rights = s.nextRight;
5266		}
5680	–	else if (t.casPending(c, c - 1))
5681	–	break;
5267		}
5683	–	} catch (Throwable ex) {
5684	–	return tryCompleteComputation(ex);
5268		}
5686	–	return false;
5269		}
5688	–	public final U getRawResult() { return result; }
5270		}
5271
5272	<	@SuppressWarnings("serial") static final class MapReduceEntriesTask<K,V,U>
5272	>	@SuppressWarnings("serial")
5273	>	static final class MapReduceEntriesTask<K,V,U>
5274		extends BulkTask<K,V,U> {
5275		final Fun<Map.Entry<K,V>, ? extends U> transformer;
5276		final BiFun<? super U, ? super U, ? extends U> reducer;
5277		U result;
5278		MapReduceEntriesTask<K,V,U> rights, nextRight;
5279		MapReduceEntriesTask
5280	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5280	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5281		MapReduceEntriesTask<K,V,U> nextRight,
5282		Fun<Map.Entry<K,V>, ? extends U> transformer,
5283		BiFun<? super U, ? super U, ? extends U> reducer) {
5284	<	super(m, p, b); this.nextRight = nextRight;
5284	>	super(p, b, i, f, t); this.nextRight = nextRight;
5285		this.transformer = transformer;
5286		this.reducer = reducer;
5287		}
5288	<	@SuppressWarnings("unchecked") public final boolean exec() {
5289	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
5290	<	this.transformer;
5291	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5292	<	this.reducer;
5293	<	if (transformer == null || reducer == null)
5294	<	return abortOnNullFunction();
5295	<	try {
5296	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5715	<	do {} while (!casPending(c = pending, c+1));
5288	>	public final U getRawResult() { return result; }
5289	>	public final void compute() {
5290	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5291	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5292	>	if ((transformer = this.transformer) != null &&
5293	>	(reducer = this.reducer) != null) {
5294	>	for (int i = baseIndex, f, h; batch > 0 &&
5295	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5296	>	addToPendingCount(1);
5297		(rights = new MapReduceEntriesTask<K,V,U>
5298	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5298	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5299	>	rights, transformer, reducer)).fork();
5300		}
5301	<	U r = null, u;
5302	<	Object v;
5303	<	while ((v = advance()) != null) {
5304	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
5301	>	U r = null;
5302	>	for (Node<K,V> p; (p = advance()) != null; ) {
5303	>	U u;
5304	>	if ((u = transformer.apply(p)) != null)
5305		r = (r == null) ? u : reducer.apply(r, u);
5306		}
5307		result = r;
5308	<	for (MapReduceEntriesTask<K,V,U> t = this, s;;) {
5309	<	int c; BulkTask<K,V,?> par; U tr, sr;
5310	<	if ((c = t.pending) == 0) {
5311	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5312	<	if ((sr = s.result) != null)
5313	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5314	<	}
5315	<	if ((par = t.parent) == null ||
5316	<	!(par instanceof MapReduceEntriesTask)) {
5317	<	t.quietlyComplete();
5318	<	break;
5737	<	}
5738	<	t = (MapReduceEntriesTask<K,V,U>)par;
5308	>	CountedCompleter<?> c;
5309	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5310	>	@SuppressWarnings("unchecked") MapReduceEntriesTask<K,V,U>
5311	>	t = (MapReduceEntriesTask<K,V,U>)c,
5312	>	s = t.rights;
5313	>	while (s != null) {
5314	>	U tr, sr;
5315	>	if ((sr = s.result) != null)
5316	>	t.result = (((tr = t.result) == null) ? sr :
5317	>	reducer.apply(tr, sr));
5318	>	s = t.rights = s.nextRight;
5319		}
5740	–	else if (t.casPending(c, c - 1))
5741	–	break;
5320		}
5743	–	} catch (Throwable ex) {
5744	–	return tryCompleteComputation(ex);
5321		}
5746	–	return false;
5322		}
5748	–	public final U getRawResult() { return result; }
5323		}
5324
5325	<	@SuppressWarnings("serial") static final class MapReduceMappingsTask<K,V,U>
5325	>	@SuppressWarnings("serial")
5326	>	static final class MapReduceMappingsTask<K,V,U>
5327		extends BulkTask<K,V,U> {
5328		final BiFun<? super K, ? super V, ? extends U> transformer;
5329		final BiFun<? super U, ? super U, ? extends U> reducer;
5330		U result;
5331		MapReduceMappingsTask<K,V,U> rights, nextRight;
5332		MapReduceMappingsTask
5333	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5333	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5334		MapReduceMappingsTask<K,V,U> nextRight,
5335		BiFun<? super K, ? super V, ? extends U> transformer,
5336		BiFun<? super U, ? super U, ? extends U> reducer) {
5337	<	super(m, p, b); this.nextRight = nextRight;
5337	>	super(p, b, i, f, t); this.nextRight = nextRight;
5338		this.transformer = transformer;
5339		this.reducer = reducer;
5340		}
5341	<	@SuppressWarnings("unchecked") public final boolean exec() {
5342	<	final BiFun<? super K, ? super V, ? extends U> transformer =
5343	<	this.transformer;
5344	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5345	<	this.reducer;
5346	<	if (transformer == null || reducer == null)
5347	<	return abortOnNullFunction();
5348	<	try {
5349	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5775	<	do {} while (!casPending(c = pending, c+1));
5341	>	public final U getRawResult() { return result; }
5342	>	public final void compute() {
5343	>	final BiFun<? super K, ? super V, ? extends U> transformer;
5344	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5345	>	if ((transformer = this.transformer) != null &&
5346	>	(reducer = this.reducer) != null) {
5347	>	for (int i = baseIndex, f, h; batch > 0 &&
5348	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5349	>	addToPendingCount(1);
5350		(rights = new MapReduceMappingsTask<K,V,U>
5351	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5351	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5352	>	rights, transformer, reducer)).fork();
5353		}
5354	<	U r = null, u;
5355	<	Object v;
5356	<	while ((v = advance()) != null) {
5357	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
5354	>	U r = null;
5355	>	for (Node<K,V> p; (p = advance()) != null; ) {
5356	>	U u;
5357	>	if ((u = transformer.apply(p.key, p.val)) != null)
5358		r = (r == null) ? u : reducer.apply(r, u);
5359		}
5360		result = r;
5361	<	for (MapReduceMappingsTask<K,V,U> t = this, s;;) {
5362	<	int c; BulkTask<K,V,?> par; U tr, sr;
5363	<	if ((c = t.pending) == 0) {
5364	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5365	<	if ((sr = s.result) != null)
5366	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5367	<	}
5368	<	if ((par = t.parent) == null ||
5369	<	!(par instanceof MapReduceMappingsTask)) {
5370	<	t.quietlyComplete();
5371	<	break;
5797	<	}
5798	<	t = (MapReduceMappingsTask<K,V,U>)par;
5361	>	CountedCompleter<?> c;
5362	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5363	>	@SuppressWarnings("unchecked") MapReduceMappingsTask<K,V,U>
5364	>	t = (MapReduceMappingsTask<K,V,U>)c,
5365	>	s = t.rights;
5366	>	while (s != null) {
5367	>	U tr, sr;
5368	>	if ((sr = s.result) != null)
5369	>	t.result = (((tr = t.result) == null) ? sr :
5370	>	reducer.apply(tr, sr));
5371	>	s = t.rights = s.nextRight;
5372		}
5800	–	else if (t.casPending(c, c - 1))
5801	–	break;
5373		}
5803	–	} catch (Throwable ex) {
5804	–	return tryCompleteComputation(ex);
5374		}
5806	–	return false;
5375		}
5808	–	public final U getRawResult() { return result; }
5376		}
5377
5378	<	@SuppressWarnings("serial") static final class MapReduceKeysToDoubleTask<K,V>
5378	>	@SuppressWarnings("serial")
5379	>	static final class MapReduceKeysToDoubleTask<K,V>
5380		extends BulkTask<K,V,Double> {
5381		final ObjectToDouble<? super K> transformer;
5382		final DoubleByDoubleToDouble reducer;
#	Line 5816 | Line 5384 | public class ConcurrentHashMapV8<K, V>
5384		double result;
5385		MapReduceKeysToDoubleTask<K,V> rights, nextRight;
5386		MapReduceKeysToDoubleTask
5387	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5387	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5388		MapReduceKeysToDoubleTask<K,V> nextRight,
5389		ObjectToDouble<? super K> transformer,
5390		double basis,
5391		DoubleByDoubleToDouble reducer) {
5392	<	super(m, p, b); this.nextRight = nextRight;
5392	>	super(p, b, i, f, t); this.nextRight = nextRight;
5393		this.transformer = transformer;
5394		this.basis = basis; this.reducer = reducer;
5395		}
5396	<	@SuppressWarnings("unchecked") public final boolean exec() {
5397	<	final ObjectToDouble<? super K> transformer =
5398	<	this.transformer;
5399	<	final DoubleByDoubleToDouble reducer = this.reducer;
5400	<	if (transformer == null || reducer == null)
5401	<	return abortOnNullFunction();
5402	<	try {
5403	<	final double id = this.basis;
5404	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5405	<	do {} while (!casPending(c = pending, c+1));
5396	>	public final Double getRawResult() { return result; }
5397	>	public final void compute() {
5398	>	final ObjectToDouble<? super K> transformer;
5399	>	final DoubleByDoubleToDouble reducer;
5400	>	if ((transformer = this.transformer) != null &&
5401	>	(reducer = this.reducer) != null) {
5402	>	double r = this.basis;
5403	>	for (int i = baseIndex, f, h; batch > 0 &&
5404	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5405	>	addToPendingCount(1);
5406		(rights = new MapReduceKeysToDoubleTask<K,V>
5407	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5407	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5408	>	rights, transformer, r, reducer)).fork();
5409		}
5410	<	double r = id;
5411	<	while (advance() != null)
5843	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5410	>	for (Node<K,V> p; (p = advance()) != null; )
5411	>	r = reducer.apply(r, transformer.apply(p.key));
5412		result = r;
5413	<	for (MapReduceKeysToDoubleTask<K,V> t = this, s;;) {
5414	<	int c; BulkTask<K,V,?> par;
5415	<	if ((c = t.pending) == 0) {
5416	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5417	<	t.result = reducer.apply(t.result, s.result);
5418	<	}
5419	<	if ((par = t.parent) == null ||
5420	<	!(par instanceof MapReduceKeysToDoubleTask)) {
5853	<	t.quietlyComplete();
5854	<	break;
5855	<	}
5856	<	t = (MapReduceKeysToDoubleTask<K,V>)par;
5413	>	CountedCompleter<?> c;
5414	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5415	>	@SuppressWarnings("unchecked") MapReduceKeysToDoubleTask<K,V>
5416	>	t = (MapReduceKeysToDoubleTask<K,V>)c,
5417	>	s = t.rights;
5418	>	while (s != null) {
5419	>	t.result = reducer.apply(t.result, s.result);
5420	>	s = t.rights = s.nextRight;
5421		}
5858	–	else if (t.casPending(c, c - 1))
5859	–	break;
5422		}
5861	–	} catch (Throwable ex) {
5862	–	return tryCompleteComputation(ex);
5423		}
5864	–	return false;
5424		}
5866	–	public final Double getRawResult() { return result; }
5425		}
5426
5427	<	@SuppressWarnings("serial") static final class MapReduceValuesToDoubleTask<K,V>
5427	>	@SuppressWarnings("serial")
5428	>	static final class MapReduceValuesToDoubleTask<K,V>
5429		extends BulkTask<K,V,Double> {
5430		final ObjectToDouble<? super V> transformer;
5431		final DoubleByDoubleToDouble reducer;
#	Line 5874 | Line 5433 | public class ConcurrentHashMapV8<K, V>
5433		double result;
5434		MapReduceValuesToDoubleTask<K,V> rights, nextRight;
5435		MapReduceValuesToDoubleTask
5436	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5436	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5437		MapReduceValuesToDoubleTask<K,V> nextRight,
5438		ObjectToDouble<? super V> transformer,
5439		double basis,
5440		DoubleByDoubleToDouble reducer) {
5441	<	super(m, p, b); this.nextRight = nextRight;
5441	>	super(p, b, i, f, t); this.nextRight = nextRight;
5442		this.transformer = transformer;
5443		this.basis = basis; this.reducer = reducer;
5444		}
5445	<	@SuppressWarnings("unchecked") public final boolean exec() {
5446	<	final ObjectToDouble<? super V> transformer =
5447	<	this.transformer;
5448	<	final DoubleByDoubleToDouble reducer = this.reducer;
5449	<	if (transformer == null || reducer == null)
5450	<	return abortOnNullFunction();
5451	<	try {
5452	<	final double id = this.basis;
5453	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5454	<	do {} while (!casPending(c = pending, c+1));
5445	>	public final Double getRawResult() { return result; }
5446	>	public final void compute() {
5447	>	final ObjectToDouble<? super V> transformer;
5448	>	final DoubleByDoubleToDouble reducer;
5449	>	if ((transformer = this.transformer) != null &&
5450	>	(reducer = this.reducer) != null) {
5451	>	double r = this.basis;
5452	>	for (int i = baseIndex, f, h; batch > 0 &&
5453	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5454	>	addToPendingCount(1);
5455		(rights = new MapReduceValuesToDoubleTask<K,V>
5456	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5456	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5457	>	rights, transformer, r, reducer)).fork();
5458		}
5459	<	double r = id;
5460	<	Object v;
5901	<	while ((v = advance()) != null)
5902	<	r = reducer.apply(r, transformer.apply((V)v));
5459	>	for (Node<K,V> p; (p = advance()) != null; )
5460	>	r = reducer.apply(r, transformer.apply(p.val));
5461		result = r;
5462	<	for (MapReduceValuesToDoubleTask<K,V> t = this, s;;) {
5463	<	int c; BulkTask<K,V,?> par;
5464	<	if ((c = t.pending) == 0) {
5465	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5466	<	t.result = reducer.apply(t.result, s.result);
5467	<	}
5468	<	if ((par = t.parent) == null ||
5469	<	!(par instanceof MapReduceValuesToDoubleTask)) {
5912	<	t.quietlyComplete();
5913	<	break;
5914	<	}
5915	<	t = (MapReduceValuesToDoubleTask<K,V>)par;
5462	>	CountedCompleter<?> c;
5463	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5464	>	@SuppressWarnings("unchecked") MapReduceValuesToDoubleTask<K,V>
5465	>	t = (MapReduceValuesToDoubleTask<K,V>)c,
5466	>	s = t.rights;
5467	>	while (s != null) {
5468	>	t.result = reducer.apply(t.result, s.result);
5469	>	s = t.rights = s.nextRight;
5470		}
5917	–	else if (t.casPending(c, c - 1))
5918	–	break;
5471		}
5920	–	} catch (Throwable ex) {
5921	–	return tryCompleteComputation(ex);
5472		}
5923	–	return false;
5473		}
5925	–	public final Double getRawResult() { return result; }
5474		}
5475
5476	<	@SuppressWarnings("serial") static final class MapReduceEntriesToDoubleTask<K,V>
5476	>	@SuppressWarnings("serial")
5477	>	static final class MapReduceEntriesToDoubleTask<K,V>
5478		extends BulkTask<K,V,Double> {
5479		final ObjectToDouble<Map.Entry<K,V>> transformer;
5480		final DoubleByDoubleToDouble reducer;
#	Line 5933 | Line 5482 | public class ConcurrentHashMapV8<K, V>
5482		double result;
5483		MapReduceEntriesToDoubleTask<K,V> rights, nextRight;
5484		MapReduceEntriesToDoubleTask
5485	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5485	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5486		MapReduceEntriesToDoubleTask<K,V> nextRight,
5487		ObjectToDouble<Map.Entry<K,V>> transformer,
5488		double basis,
5489		DoubleByDoubleToDouble reducer) {
5490	<	super(m, p, b); this.nextRight = nextRight;
5490	>	super(p, b, i, f, t); this.nextRight = nextRight;
5491		this.transformer = transformer;
5492		this.basis = basis; this.reducer = reducer;
5493		}
5494	<	@SuppressWarnings("unchecked") public final boolean exec() {
5495	<	final ObjectToDouble<Map.Entry<K,V>> transformer =
5496	<	this.transformer;
5497	<	final DoubleByDoubleToDouble reducer = this.reducer;
5498	<	if (transformer == null || reducer == null)
5499	<	return abortOnNullFunction();
5500	<	try {
5501	<	final double id = this.basis;
5502	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5503	<	do {} while (!casPending(c = pending, c+1));
5494	>	public final Double getRawResult() { return result; }
5495	>	public final void compute() {
5496	>	final ObjectToDouble<Map.Entry<K,V>> transformer;
5497	>	final DoubleByDoubleToDouble reducer;
5498	>	if ((transformer = this.transformer) != null &&
5499	>	(reducer = this.reducer) != null) {
5500	>	double r = this.basis;
5501	>	for (int i = baseIndex, f, h; batch > 0 &&
5502	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5503	>	addToPendingCount(1);
5504		(rights = new MapReduceEntriesToDoubleTask<K,V>
5505	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5505	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5506	>	rights, transformer, r, reducer)).fork();
5507		}
5508	<	double r = id;
5509	<	Object v;
5960	<	while ((v = advance()) != null)
5961	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5508	>	for (Node<K,V> p; (p = advance()) != null; )
5509	>	r = reducer.apply(r, transformer.apply(p));
5510		result = r;
5511	<	for (MapReduceEntriesToDoubleTask<K,V> t = this, s;;) {
5512	<	int c; BulkTask<K,V,?> par;
5513	<	if ((c = t.pending) == 0) {
5514	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5515	<	t.result = reducer.apply(t.result, s.result);
5516	<	}
5517	<	if ((par = t.parent) == null ||
5518	<	!(par instanceof MapReduceEntriesToDoubleTask)) {
5971	<	t.quietlyComplete();
5972	<	break;
5973	<	}
5974	<	t = (MapReduceEntriesToDoubleTask<K,V>)par;
5511	>	CountedCompleter<?> c;
5512	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5513	>	@SuppressWarnings("unchecked") MapReduceEntriesToDoubleTask<K,V>
5514	>	t = (MapReduceEntriesToDoubleTask<K,V>)c,
5515	>	s = t.rights;
5516	>	while (s != null) {
5517	>	t.result = reducer.apply(t.result, s.result);
5518	>	s = t.rights = s.nextRight;
5519		}
5976	–	else if (t.casPending(c, c - 1))
5977	–	break;
5520		}
5979	–	} catch (Throwable ex) {
5980	–	return tryCompleteComputation(ex);
5521		}
5982	–	return false;
5522		}
5984	–	public final Double getRawResult() { return result; }
5523		}
5524
5525	<	@SuppressWarnings("serial") static final class MapReduceMappingsToDoubleTask<K,V>
5525	>	@SuppressWarnings("serial")
5526	>	static final class MapReduceMappingsToDoubleTask<K,V>
5527		extends BulkTask<K,V,Double> {
5528		final ObjectByObjectToDouble<? super K, ? super V> transformer;
5529		final DoubleByDoubleToDouble reducer;
#	Line 5992 | Line 5531 | public class ConcurrentHashMapV8<K, V>
5531		double result;
5532		MapReduceMappingsToDoubleTask<K,V> rights, nextRight;
5533		MapReduceMappingsToDoubleTask
5534	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5534	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5535		MapReduceMappingsToDoubleTask<K,V> nextRight,
5536		ObjectByObjectToDouble<? super K, ? super V> transformer,
5537		double basis,
5538		DoubleByDoubleToDouble reducer) {
5539	<	super(m, p, b); this.nextRight = nextRight;
5539	>	super(p, b, i, f, t); this.nextRight = nextRight;
5540		this.transformer = transformer;
5541		this.basis = basis; this.reducer = reducer;
5542		}
5543	<	@SuppressWarnings("unchecked") public final boolean exec() {
5544	<	final ObjectByObjectToDouble<? super K, ? super V> transformer =
5545	<	this.transformer;
5546	<	final DoubleByDoubleToDouble reducer = this.reducer;
5547	<	if (transformer == null || reducer == null)
5548	<	return abortOnNullFunction();
5549	<	try {
5550	<	final double id = this.basis;
5551	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5552	<	do {} while (!casPending(c = pending, c+1));
5543	>	public final Double getRawResult() { return result; }
5544	>	public final void compute() {
5545	>	final ObjectByObjectToDouble<? super K, ? super V> transformer;
5546	>	final DoubleByDoubleToDouble reducer;
5547	>	if ((transformer = this.transformer) != null &&
5548	>	(reducer = this.reducer) != null) {
5549	>	double r = this.basis;
5550	>	for (int i = baseIndex, f, h; batch > 0 &&
5551	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5552	>	addToPendingCount(1);
5553		(rights = new MapReduceMappingsToDoubleTask<K,V>
5554	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5554	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5555	>	rights, transformer, r, reducer)).fork();
5556		}
5557	<	double r = id;
5558	<	Object v;
6019	<	while ((v = advance()) != null)
6020	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5557	>	for (Node<K,V> p; (p = advance()) != null; )
5558	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5559		result = r;
5560	<	for (MapReduceMappingsToDoubleTask<K,V> t = this, s;;) {
5561	<	int c; BulkTask<K,V,?> par;
5562	<	if ((c = t.pending) == 0) {
5563	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5564	<	t.result = reducer.apply(t.result, s.result);
5565	<	}
5566	<	if ((par = t.parent) == null ||
5567	<	!(par instanceof MapReduceMappingsToDoubleTask)) {
6030	<	t.quietlyComplete();
6031	<	break;
6032	<	}
6033	<	t = (MapReduceMappingsToDoubleTask<K,V>)par;
5560	>	CountedCompleter<?> c;
5561	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5562	>	@SuppressWarnings("unchecked") MapReduceMappingsToDoubleTask<K,V>
5563	>	t = (MapReduceMappingsToDoubleTask<K,V>)c,
5564	>	s = t.rights;
5565	>	while (s != null) {
5566	>	t.result = reducer.apply(t.result, s.result);
5567	>	s = t.rights = s.nextRight;
5568		}
6035	–	else if (t.casPending(c, c - 1))
6036	–	break;
5569		}
6038	–	} catch (Throwable ex) {
6039	–	return tryCompleteComputation(ex);
5570		}
6041	–	return false;
5571		}
6043	–	public final Double getRawResult() { return result; }
5572		}
5573
5574	<	@SuppressWarnings("serial") static final class MapReduceKeysToLongTask<K,V>
5574	>	@SuppressWarnings("serial")
5575	>	static final class MapReduceKeysToLongTask<K,V>
5576		extends BulkTask<K,V,Long> {
5577		final ObjectToLong<? super K> transformer;
5578		final LongByLongToLong reducer;
#	Line 6051 | Line 5580 | public class ConcurrentHashMapV8<K, V>
5580		long result;
5581		MapReduceKeysToLongTask<K,V> rights, nextRight;
5582		MapReduceKeysToLongTask
5583	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5583	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5584		MapReduceKeysToLongTask<K,V> nextRight,
5585		ObjectToLong<? super K> transformer,
5586		long basis,
5587		LongByLongToLong reducer) {
5588	<	super(m, p, b); this.nextRight = nextRight;
5588	>	super(p, b, i, f, t); this.nextRight = nextRight;
5589		this.transformer = transformer;
5590		this.basis = basis; this.reducer = reducer;
5591		}
5592	<	@SuppressWarnings("unchecked") public final boolean exec() {
5593	<	final ObjectToLong<? super K> transformer =
5594	<	this.transformer;
5595	<	final LongByLongToLong reducer = this.reducer;
5596	<	if (transformer == null || reducer == null)
5597	<	return abortOnNullFunction();
5598	<	try {
5599	<	final long id = this.basis;
5600	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5601	<	do {} while (!casPending(c = pending, c+1));
5592	>	public final Long getRawResult() { return result; }
5593	>	public final void compute() {
5594	>	final ObjectToLong<? super K> transformer;
5595	>	final LongByLongToLong reducer;
5596	>	if ((transformer = this.transformer) != null &&
5597	>	(reducer = this.reducer) != null) {
5598	>	long r = this.basis;
5599	>	for (int i = baseIndex, f, h; batch > 0 &&
5600	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5601	>	addToPendingCount(1);
5602		(rights = new MapReduceKeysToLongTask<K,V>
5603	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5603	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5604	>	rights, transformer, r, reducer)).fork();
5605		}
5606	<	long r = id;
5607	<	while (advance() != null)
6078	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5606	>	for (Node<K,V> p; (p = advance()) != null; )
5607	>	r = reducer.apply(r, transformer.apply(p.key));
5608		result = r;
5609	<	for (MapReduceKeysToLongTask<K,V> t = this, s;;) {
5610	<	int c; BulkTask<K,V,?> par;
5611	<	if ((c = t.pending) == 0) {
5612	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5613	<	t.result = reducer.apply(t.result, s.result);
5614	<	}
5615	<	if ((par = t.parent) == null ||
5616	<	!(par instanceof MapReduceKeysToLongTask)) {
6088	<	t.quietlyComplete();
6089	<	break;
6090	<	}
6091	<	t = (MapReduceKeysToLongTask<K,V>)par;
5609	>	CountedCompleter<?> c;
5610	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5611	>	@SuppressWarnings("unchecked") MapReduceKeysToLongTask<K,V>
5612	>	t = (MapReduceKeysToLongTask<K,V>)c,
5613	>	s = t.rights;
5614	>	while (s != null) {
5615	>	t.result = reducer.apply(t.result, s.result);
5616	>	s = t.rights = s.nextRight;
5617		}
6093	–	else if (t.casPending(c, c - 1))
6094	–	break;
5618		}
6096	–	} catch (Throwable ex) {
6097	–	return tryCompleteComputation(ex);
5619		}
6099	–	return false;
5620		}
6101	–	public final Long getRawResult() { return result; }
5621		}
5622
5623	<	@SuppressWarnings("serial") static final class MapReduceValuesToLongTask<K,V>
5623	>	@SuppressWarnings("serial")
5624	>	static final class MapReduceValuesToLongTask<K,V>
5625		extends BulkTask<K,V,Long> {
5626		final ObjectToLong<? super V> transformer;
5627		final LongByLongToLong reducer;
#	Line 6109 | Line 5629 | public class ConcurrentHashMapV8<K, V>
5629		long result;
5630		MapReduceValuesToLongTask<K,V> rights, nextRight;
5631		MapReduceValuesToLongTask
5632	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5632	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5633		MapReduceValuesToLongTask<K,V> nextRight,
5634		ObjectToLong<? super V> transformer,
5635		long basis,
5636		LongByLongToLong reducer) {
5637	<	super(m, p, b); this.nextRight = nextRight;
5637	>	super(p, b, i, f, t); this.nextRight = nextRight;
5638		this.transformer = transformer;
5639		this.basis = basis; this.reducer = reducer;
5640		}
5641	<	@SuppressWarnings("unchecked") public final boolean exec() {
5642	<	final ObjectToLong<? super V> transformer =
5643	<	this.transformer;
5644	<	final LongByLongToLong reducer = this.reducer;
5645	<	if (transformer == null || reducer == null)
5646	<	return abortOnNullFunction();
5647	<	try {
5648	<	final long id = this.basis;
5649	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5650	<	do {} while (!casPending(c = pending, c+1));
5641	>	public final Long getRawResult() { return result; }
5642	>	public final void compute() {
5643	>	final ObjectToLong<? super V> transformer;
5644	>	final LongByLongToLong reducer;
5645	>	if ((transformer = this.transformer) != null &&
5646	>	(reducer = this.reducer) != null) {
5647	>	long r = this.basis;
5648	>	for (int i = baseIndex, f, h; batch > 0 &&
5649	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5650	>	addToPendingCount(1);
5651		(rights = new MapReduceValuesToLongTask<K,V>
5652	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5652	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5653	>	rights, transformer, r, reducer)).fork();
5654		}
5655	<	long r = id;
5656	<	Object v;
6136	<	while ((v = advance()) != null)
6137	<	r = reducer.apply(r, transformer.apply((V)v));
5655	>	for (Node<K,V> p; (p = advance()) != null; )
5656	>	r = reducer.apply(r, transformer.apply(p.val));
5657		result = r;
5658	<	for (MapReduceValuesToLongTask<K,V> t = this, s;;) {
5659	<	int c; BulkTask<K,V,?> par;
5660	<	if ((c = t.pending) == 0) {
5661	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5662	<	t.result = reducer.apply(t.result, s.result);
5663	<	}
5664	<	if ((par = t.parent) == null ||
5665	<	!(par instanceof MapReduceValuesToLongTask)) {
6147	<	t.quietlyComplete();
6148	<	break;
6149	<	}
6150	<	t = (MapReduceValuesToLongTask<K,V>)par;
5658	>	CountedCompleter<?> c;
5659	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5660	>	@SuppressWarnings("unchecked") MapReduceValuesToLongTask<K,V>
5661	>	t = (MapReduceValuesToLongTask<K,V>)c,
5662	>	s = t.rights;
5663	>	while (s != null) {
5664	>	t.result = reducer.apply(t.result, s.result);
5665	>	s = t.rights = s.nextRight;
5666		}
6152	–	else if (t.casPending(c, c - 1))
6153	–	break;
5667		}
6155	–	} catch (Throwable ex) {
6156	–	return tryCompleteComputation(ex);
5668		}
6158	–	return false;
5669		}
6160	–	public final Long getRawResult() { return result; }
5670		}
5671
5672	<	@SuppressWarnings("serial") static final class MapReduceEntriesToLongTask<K,V>
5672	>	@SuppressWarnings("serial")
5673	>	static final class MapReduceEntriesToLongTask<K,V>
5674		extends BulkTask<K,V,Long> {
5675		final ObjectToLong<Map.Entry<K,V>> transformer;
5676		final LongByLongToLong reducer;
#	Line 6168 | Line 5678 | public class ConcurrentHashMapV8<K, V>
5678		long result;
5679		MapReduceEntriesToLongTask<K,V> rights, nextRight;
5680		MapReduceEntriesToLongTask
5681	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5681	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5682		MapReduceEntriesToLongTask<K,V> nextRight,
5683		ObjectToLong<Map.Entry<K,V>> transformer,
5684		long basis,
5685		LongByLongToLong reducer) {
5686	<	super(m, p, b); this.nextRight = nextRight;
5686	>	super(p, b, i, f, t); this.nextRight = nextRight;
5687		this.transformer = transformer;
5688		this.basis = basis; this.reducer = reducer;
5689		}
5690	<	@SuppressWarnings("unchecked") public final boolean exec() {
5691	<	final ObjectToLong<Map.Entry<K,V>> transformer =
5692	<	this.transformer;
5693	<	final LongByLongToLong reducer = this.reducer;
5694	<	if (transformer == null || reducer == null)
5695	<	return abortOnNullFunction();
5696	<	try {
5697	<	final long id = this.basis;
5698	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5699	<	do {} while (!casPending(c = pending, c+1));
5690	>	public final Long getRawResult() { return result; }
5691	>	public final void compute() {
5692	>	final ObjectToLong<Map.Entry<K,V>> transformer;
5693	>	final LongByLongToLong reducer;
5694	>	if ((transformer = this.transformer) != null &&
5695	>	(reducer = this.reducer) != null) {
5696	>	long r = this.basis;
5697	>	for (int i = baseIndex, f, h; batch > 0 &&
5698	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5699	>	addToPendingCount(1);
5700		(rights = new MapReduceEntriesToLongTask<K,V>
5701	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5701	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5702	>	rights, transformer, r, reducer)).fork();
5703		}
5704	<	long r = id;
5705	<	Object v;
6195	<	while ((v = advance()) != null)
6196	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5704	>	for (Node<K,V> p; (p = advance()) != null; )
5705	>	r = reducer.apply(r, transformer.apply(p));
5706		result = r;
5707	<	for (MapReduceEntriesToLongTask<K,V> t = this, s;;) {
5708	<	int c; BulkTask<K,V,?> par;
5709	<	if ((c = t.pending) == 0) {
5710	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5711	<	t.result = reducer.apply(t.result, s.result);
5712	<	}
5713	<	if ((par = t.parent) == null ||
5714	<	!(par instanceof MapReduceEntriesToLongTask)) {
6206	<	t.quietlyComplete();
6207	<	break;
6208	<	}
6209	<	t = (MapReduceEntriesToLongTask<K,V>)par;
5707	>	CountedCompleter<?> c;
5708	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5709	>	@SuppressWarnings("unchecked") MapReduceEntriesToLongTask<K,V>
5710	>	t = (MapReduceEntriesToLongTask<K,V>)c,
5711	>	s = t.rights;
5712	>	while (s != null) {
5713	>	t.result = reducer.apply(t.result, s.result);
5714	>	s = t.rights = s.nextRight;
5715		}
6211	–	else if (t.casPending(c, c - 1))
6212	–	break;
5716		}
6214	–	} catch (Throwable ex) {
6215	–	return tryCompleteComputation(ex);
5717		}
6217	–	return false;
5718		}
6219	–	public final Long getRawResult() { return result; }
5719		}
5720
5721	<	@SuppressWarnings("serial") static final class MapReduceMappingsToLongTask<K,V>
5721	>	@SuppressWarnings("serial")
5722	>	static final class MapReduceMappingsToLongTask<K,V>
5723		extends BulkTask<K,V,Long> {
5724		final ObjectByObjectToLong<? super K, ? super V> transformer;
5725		final LongByLongToLong reducer;
#	Line 6227 | Line 5727 | public class ConcurrentHashMapV8<K, V>
5727		long result;
5728		MapReduceMappingsToLongTask<K,V> rights, nextRight;
5729		MapReduceMappingsToLongTask
5730	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5730	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5731		MapReduceMappingsToLongTask<K,V> nextRight,
5732		ObjectByObjectToLong<? super K, ? super V> transformer,
5733		long basis,
5734		LongByLongToLong reducer) {
5735	<	super(m, p, b); this.nextRight = nextRight;
5735	>	super(p, b, i, f, t); this.nextRight = nextRight;
5736		this.transformer = transformer;
5737		this.basis = basis; this.reducer = reducer;
5738		}
5739	<	@SuppressWarnings("unchecked") public final boolean exec() {
5740	<	final ObjectByObjectToLong<? super K, ? super V> transformer =
5741	<	this.transformer;
5742	<	final LongByLongToLong reducer = this.reducer;
5743	<	if (transformer == null || reducer == null)
5744	<	return abortOnNullFunction();
5745	<	try {
5746	<	final long id = this.basis;
5747	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5748	<	do {} while (!casPending(c = pending, c+1));
5739	>	public final Long getRawResult() { return result; }
5740	>	public final void compute() {
5741	>	final ObjectByObjectToLong<? super K, ? super V> transformer;
5742	>	final LongByLongToLong reducer;
5743	>	if ((transformer = this.transformer) != null &&
5744	>	(reducer = this.reducer) != null) {
5745	>	long r = this.basis;
5746	>	for (int i = baseIndex, f, h; batch > 0 &&
5747	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5748	>	addToPendingCount(1);
5749		(rights = new MapReduceMappingsToLongTask<K,V>
5750	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5750	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5751	>	rights, transformer, r, reducer)).fork();
5752		}
5753	<	long r = id;
5754	<	Object v;
6254	<	while ((v = advance()) != null)
6255	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5753	>	for (Node<K,V> p; (p = advance()) != null; )
5754	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5755		result = r;
5756	<	for (MapReduceMappingsToLongTask<K,V> t = this, s;;) {
5757	<	int c; BulkTask<K,V,?> par;
5758	<	if ((c = t.pending) == 0) {
5759	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5760	<	t.result = reducer.apply(t.result, s.result);
5761	<	}
5762	<	if ((par = t.parent) == null ||
5763	<	!(par instanceof MapReduceMappingsToLongTask)) {
6265	<	t.quietlyComplete();
6266	<	break;
6267	<	}
6268	<	t = (MapReduceMappingsToLongTask<K,V>)par;
5756	>	CountedCompleter<?> c;
5757	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5758	>	@SuppressWarnings("unchecked") MapReduceMappingsToLongTask<K,V>
5759	>	t = (MapReduceMappingsToLongTask<K,V>)c,
5760	>	s = t.rights;
5761	>	while (s != null) {
5762	>	t.result = reducer.apply(t.result, s.result);
5763	>	s = t.rights = s.nextRight;
5764		}
6270	–	else if (t.casPending(c, c - 1))
6271	–	break;
5765		}
6273	–	} catch (Throwable ex) {
6274	–	return tryCompleteComputation(ex);
5766		}
6276	–	return false;
5767		}
6278	–	public final Long getRawResult() { return result; }
5768		}
5769
5770	<	@SuppressWarnings("serial") static final class MapReduceKeysToIntTask<K,V>
5770	>	@SuppressWarnings("serial")
5771	>	static final class MapReduceKeysToIntTask<K,V>
5772		extends BulkTask<K,V,Integer> {
5773		final ObjectToInt<? super K> transformer;
5774		final IntByIntToInt reducer;
#	Line 6286 | Line 5776 | public class ConcurrentHashMapV8<K, V>
5776		int result;
5777		MapReduceKeysToIntTask<K,V> rights, nextRight;
5778		MapReduceKeysToIntTask
5779	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5779	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5780		MapReduceKeysToIntTask<K,V> nextRight,
5781		ObjectToInt<? super K> transformer,
5782		int basis,
5783		IntByIntToInt reducer) {
5784	<	super(m, p, b); this.nextRight = nextRight;
5784	>	super(p, b, i, f, t); this.nextRight = nextRight;
5785		this.transformer = transformer;
5786		this.basis = basis; this.reducer = reducer;
5787		}
5788	<	@SuppressWarnings("unchecked") public final boolean exec() {
5789	<	final ObjectToInt<? super K> transformer =
5790	<	this.transformer;
5791	<	final IntByIntToInt reducer = this.reducer;
5792	<	if (transformer == null || reducer == null)
5793	<	return abortOnNullFunction();
5794	<	try {
5795	<	final int id = this.basis;
5796	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5797	<	do {} while (!casPending(c = pending, c+1));
5788	>	public final Integer getRawResult() { return result; }
5789	>	public final void compute() {
5790	>	final ObjectToInt<? super K> transformer;
5791	>	final IntByIntToInt reducer;
5792	>	if ((transformer = this.transformer) != null &&
5793	>	(reducer = this.reducer) != null) {
5794	>	int r = this.basis;
5795	>	for (int i = baseIndex, f, h; batch > 0 &&
5796	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5797	>	addToPendingCount(1);
5798		(rights = new MapReduceKeysToIntTask<K,V>
5799	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5799	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5800	>	rights, transformer, r, reducer)).fork();
5801		}
5802	<	int r = id;
5803	<	while (advance() != null)
6313	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5802	>	for (Node<K,V> p; (p = advance()) != null; )
5803	>	r = reducer.apply(r, transformer.apply(p.key));
5804		result = r;
5805	<	for (MapReduceKeysToIntTask<K,V> t = this, s;;) {
5806	<	int c; BulkTask<K,V,?> par;
5807	<	if ((c = t.pending) == 0) {
5808	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5809	<	t.result = reducer.apply(t.result, s.result);
5810	<	}
5811	<	if ((par = t.parent) == null ||
5812	<	!(par instanceof MapReduceKeysToIntTask)) {
6323	<	t.quietlyComplete();
6324	<	break;
6325	<	}
6326	<	t = (MapReduceKeysToIntTask<K,V>)par;
5805	>	CountedCompleter<?> c;
5806	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5807	>	@SuppressWarnings("unchecked") MapReduceKeysToIntTask<K,V>
5808	>	t = (MapReduceKeysToIntTask<K,V>)c,
5809	>	s = t.rights;
5810	>	while (s != null) {
5811	>	t.result = reducer.apply(t.result, s.result);
5812	>	s = t.rights = s.nextRight;
5813		}
6328	–	else if (t.casPending(c, c - 1))
6329	–	break;
5814		}
6331	–	} catch (Throwable ex) {
6332	–	return tryCompleteComputation(ex);
5815		}
6334	–	return false;
5816		}
6336	–	public final Integer getRawResult() { return result; }
5817		}
5818
5819	<	@SuppressWarnings("serial") static final class MapReduceValuesToIntTask<K,V>
5819	>	@SuppressWarnings("serial")
5820	>	static final class MapReduceValuesToIntTask<K,V>
5821		extends BulkTask<K,V,Integer> {
5822		final ObjectToInt<? super V> transformer;
5823		final IntByIntToInt reducer;
#	Line 6344 | Line 5825 | public class ConcurrentHashMapV8<K, V>
5825		int result;
5826		MapReduceValuesToIntTask<K,V> rights, nextRight;
5827		MapReduceValuesToIntTask
5828	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5828	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5829		MapReduceValuesToIntTask<K,V> nextRight,
5830		ObjectToInt<? super V> transformer,
5831		int basis,
5832		IntByIntToInt reducer) {
5833	<	super(m, p, b); this.nextRight = nextRight;
5833	>	super(p, b, i, f, t); this.nextRight = nextRight;
5834		this.transformer = transformer;
5835		this.basis = basis; this.reducer = reducer;
5836		}
5837	<	@SuppressWarnings("unchecked") public final boolean exec() {
5838	<	final ObjectToInt<? super V> transformer =
5839	<	this.transformer;
5840	<	final IntByIntToInt reducer = this.reducer;
5841	<	if (transformer == null || reducer == null)
5842	<	return abortOnNullFunction();
5843	<	try {
5844	<	final int id = this.basis;
5845	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5846	<	do {} while (!casPending(c = pending, c+1));
5837	>	public final Integer getRawResult() { return result; }
5838	>	public final void compute() {
5839	>	final ObjectToInt<? super V> transformer;
5840	>	final IntByIntToInt reducer;
5841	>	if ((transformer = this.transformer) != null &&
5842	>	(reducer = this.reducer) != null) {
5843	>	int r = this.basis;
5844	>	for (int i = baseIndex, f, h; batch > 0 &&
5845	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5846	>	addToPendingCount(1);
5847		(rights = new MapReduceValuesToIntTask<K,V>
5848	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5848	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5849	>	rights, transformer, r, reducer)).fork();
5850		}
5851	<	int r = id;
5852	<	Object v;
6371	<	while ((v = advance()) != null)
6372	<	r = reducer.apply(r, transformer.apply((V)v));
5851	>	for (Node<K,V> p; (p = advance()) != null; )
5852	>	r = reducer.apply(r, transformer.apply(p.val));
5853		result = r;
5854	<	for (MapReduceValuesToIntTask<K,V> t = this, s;;) {
5855	<	int c; BulkTask<K,V,?> par;
5856	<	if ((c = t.pending) == 0) {
5857	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5858	<	t.result = reducer.apply(t.result, s.result);
5859	<	}
5860	<	if ((par = t.parent) == null ||
5861	<	!(par instanceof MapReduceValuesToIntTask)) {
6382	<	t.quietlyComplete();
6383	<	break;
6384	<	}
6385	<	t = (MapReduceValuesToIntTask<K,V>)par;
5854	>	CountedCompleter<?> c;
5855	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5856	>	@SuppressWarnings("unchecked") MapReduceValuesToIntTask<K,V>
5857	>	t = (MapReduceValuesToIntTask<K,V>)c,
5858	>	s = t.rights;
5859	>	while (s != null) {
5860	>	t.result = reducer.apply(t.result, s.result);
5861	>	s = t.rights = s.nextRight;
5862		}
6387	–	else if (t.casPending(c, c - 1))
6388	–	break;
5863		}
6390	–	} catch (Throwable ex) {
6391	–	return tryCompleteComputation(ex);
5864		}
6393	–	return false;
5865		}
6395	–	public final Integer getRawResult() { return result; }
5866		}
5867
5868	<	@SuppressWarnings("serial") static final class MapReduceEntriesToIntTask<K,V>
5868	>	@SuppressWarnings("serial")
5869	>	static final class MapReduceEntriesToIntTask<K,V>
5870		extends BulkTask<K,V,Integer> {
5871		final ObjectToInt<Map.Entry<K,V>> transformer;
5872		final IntByIntToInt reducer;
#	Line 6403 | Line 5874 | public class ConcurrentHashMapV8<K, V>
5874		int result;
5875		MapReduceEntriesToIntTask<K,V> rights, nextRight;
5876		MapReduceEntriesToIntTask
5877	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5877	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5878		MapReduceEntriesToIntTask<K,V> nextRight,
5879		ObjectToInt<Map.Entry<K,V>> transformer,
5880		int basis,
5881		IntByIntToInt reducer) {
5882	<	super(m, p, b); this.nextRight = nextRight;
5882	>	super(p, b, i, f, t); this.nextRight = nextRight;
5883		this.transformer = transformer;
5884		this.basis = basis; this.reducer = reducer;
5885		}
5886	<	@SuppressWarnings("unchecked") public final boolean exec() {
5887	<	final ObjectToInt<Map.Entry<K,V>> transformer =
5888	<	this.transformer;
5889	<	final IntByIntToInt reducer = this.reducer;
5890	<	if (transformer == null || reducer == null)
5891	<	return abortOnNullFunction();
5892	<	try {
5893	<	final int id = this.basis;
5894	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5895	<	do {} while (!casPending(c = pending, c+1));
5886	>	public final Integer getRawResult() { return result; }
5887	>	public final void compute() {
5888	>	final ObjectToInt<Map.Entry<K,V>> transformer;
5889	>	final IntByIntToInt reducer;
5890	>	if ((transformer = this.transformer) != null &&
5891	>	(reducer = this.reducer) != null) {
5892	>	int r = this.basis;
5893	>	for (int i = baseIndex, f, h; batch > 0 &&
5894	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5895	>	addToPendingCount(1);
5896		(rights = new MapReduceEntriesToIntTask<K,V>
5897	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5897	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5898	>	rights, transformer, r, reducer)).fork();
5899		}
5900	<	int r = id;
5901	<	Object v;
6430	<	while ((v = advance()) != null)
6431	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5900	>	for (Node<K,V> p; (p = advance()) != null; )
5901	>	r = reducer.apply(r, transformer.apply(p));
5902		result = r;
5903	<	for (MapReduceEntriesToIntTask<K,V> t = this, s;;) {
5904	<	int c; BulkTask<K,V,?> par;
5905	<	if ((c = t.pending) == 0) {
5906	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5907	<	t.result = reducer.apply(t.result, s.result);
5908	<	}
5909	<	if ((par = t.parent) == null ||
5910	<	!(par instanceof MapReduceEntriesToIntTask)) {
6441	<	t.quietlyComplete();
6442	<	break;
6443	<	}
6444	<	t = (MapReduceEntriesToIntTask<K,V>)par;
5903	>	CountedCompleter<?> c;
5904	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5905	>	@SuppressWarnings("unchecked") MapReduceEntriesToIntTask<K,V>
5906	>	t = (MapReduceEntriesToIntTask<K,V>)c,
5907	>	s = t.rights;
5908	>	while (s != null) {
5909	>	t.result = reducer.apply(t.result, s.result);
5910	>	s = t.rights = s.nextRight;
5911		}
6446	–	else if (t.casPending(c, c - 1))
6447	–	break;
5912		}
6449	–	} catch (Throwable ex) {
6450	–	return tryCompleteComputation(ex);
5913		}
6452	–	return false;
5914		}
6454	–	public final Integer getRawResult() { return result; }
5915		}
5916
5917	<	@SuppressWarnings("serial") static final class MapReduceMappingsToIntTask<K,V>
5917	>	@SuppressWarnings("serial")
5918	>	static final class MapReduceMappingsToIntTask<K,V>
5919		extends BulkTask<K,V,Integer> {
5920		final ObjectByObjectToInt<? super K, ? super V> transformer;
5921		final IntByIntToInt reducer;
#	Line 6462 | Line 5923 | public class ConcurrentHashMapV8<K, V>
5923		int result;
5924		MapReduceMappingsToIntTask<K,V> rights, nextRight;
5925		MapReduceMappingsToIntTask
5926	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5927	<	MapReduceMappingsToIntTask<K,V> rights,
5926	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5927	>	MapReduceMappingsToIntTask<K,V> nextRight,
5928		ObjectByObjectToInt<? super K, ? super V> transformer,
5929		int basis,
5930		IntByIntToInt reducer) {
5931	<	super(m, p, b); this.nextRight = nextRight;
5931	>	super(p, b, i, f, t); this.nextRight = nextRight;
5932		this.transformer = transformer;
5933		this.basis = basis; this.reducer = reducer;
5934		}
5935	<	@SuppressWarnings("unchecked") public final boolean exec() {
5936	<	final ObjectByObjectToInt<? super K, ? super V> transformer =
5937	<	this.transformer;
5938	<	final IntByIntToInt reducer = this.reducer;
5939	<	if (transformer == null || reducer == null)
5940	<	return abortOnNullFunction();
5941	<	try {
5942	<	final int id = this.basis;
5943	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5944	<	do {} while (!casPending(c = pending, c+1));
5935	>	public final Integer getRawResult() { return result; }
5936	>	public final void compute() {
5937	>	final ObjectByObjectToInt<? super K, ? super V> transformer;
5938	>	final IntByIntToInt reducer;
5939	>	if ((transformer = this.transformer) != null &&
5940	>	(reducer = this.reducer) != null) {
5941	>	int r = this.basis;
5942	>	for (int i = baseIndex, f, h; batch > 0 &&
5943	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5944	>	addToPendingCount(1);
5945		(rights = new MapReduceMappingsToIntTask<K,V>
5946	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5946	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5947	>	rights, transformer, r, reducer)).fork();
5948		}
5949	<	int r = id;
5950	<	Object v;
6489	<	while ((v = advance()) != null)
6490	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5949	>	for (Node<K,V> p; (p = advance()) != null; )
5950	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5951		result = r;
5952	<	for (MapReduceMappingsToIntTask<K,V> t = this, s;;) {
5953	<	int c; BulkTask<K,V,?> par;
5954	<	if ((c = t.pending) == 0) {
5955	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5956	<	t.result = reducer.apply(t.result, s.result);
5952	>	CountedCompleter<?> c;
5953	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5954	>	@SuppressWarnings("unchecked") MapReduceMappingsToIntTask<K,V>
5955	>	t = (MapReduceMappingsToIntTask<K,V>)c,
5956	>	s = t.rights;
5957	>	while (s != null) {
5958	>	t.result = reducer.apply(t.result, s.result);
5959	>	s = t.rights = s.nextRight;
5960	>	}
5961	>	}
5962	>	}
5963	>	}
5964	>	}
5965	>
5966	>	/* ---------------- Counters -------------- */
5967	>
5968	>	// Adapted from LongAdder and Striped64.
5969	>	// See their internal docs for explanation.
5970	>
5971	>	// A padded cell for distributing counts
5972	>	static final class CounterCell {
5973	>	volatile long p0, p1, p2, p3, p4, p5, p6;
5974	>	volatile long value;
5975	>	volatile long q0, q1, q2, q3, q4, q5, q6;
5976	>	CounterCell(long x) { value = x; }
5977	>	}
5978	>
5979	>	/**
5980	>	* Holder for the thread-local hash code determining which
5981	>	* CounterCell to use. The code is initialized via the
5982	>	* counterHashCodeGenerator, but may be moved upon collisions.
5983	>	*/
5984	>	static final class CounterHashCode {
5985	>	int code;
5986	>	}
5987	>
5988	>	/**
5989	>	* Generates initial value for per-thread CounterHashCodes.
5990	>	*/
5991	>	static final AtomicInteger counterHashCodeGenerator = new AtomicInteger();
5992	>
5993	>	/**
5994	>	* Increment for counterHashCodeGenerator. See class ThreadLocal
5995	>	* for explanation.
5996	>	*/
5997	>	static final int SEED_INCREMENT = 0x61c88647;
5998	>
5999	>	/**
6000	>	* Per-thread counter hash codes. Shared across all instances.
6001	>	*/
6002	>	static final ThreadLocal<CounterHashCode> threadCounterHashCode =
6003	>	new ThreadLocal<CounterHashCode>();
6004	>
6005	>
6006	>	final long sumCount() {
6007	>	CounterCell[] as = counterCells; CounterCell a;
6008	>	long sum = baseCount;
6009	>	if (as != null) {
6010	>	for (int i = 0; i < as.length; ++i) {
6011	>	if ((a = as[i]) != null)
6012	>	sum += a.value;
6013	>	}
6014	>	}
6015	>	return sum;
6016	>	}
6017	>
6018	>	// See LongAdder version for explanation
6019	>	private final void fullAddCount(long x, CounterHashCode hc,
6020	>	boolean wasUncontended) {
6021	>	int h;
6022	>	if (hc == null) {
6023	>	hc = new CounterHashCode();
6024	>	int s = counterHashCodeGenerator.addAndGet(SEED_INCREMENT);
6025	>	h = hc.code = (s == 0) ? 1 : s; // Avoid zero
6026	>	threadCounterHashCode.set(hc);
6027	>	}
6028	>	else
6029	>	h = hc.code;
6030	>	boolean collide = false;                // True if last slot nonempty
6031	>	for (;;) {
6032	>	CounterCell[] as; CounterCell a; int n; long v;
6033	>	if ((as = counterCells) != null && (n = as.length) > 0) {
6034	>	if ((a = as[(n - 1) & h]) == null) {
6035	>	if (cellsBusy == 0) {            // Try to attach new Cell
6036	>	CounterCell r = new CounterCell(x); // Optimistic create
6037	>	if (cellsBusy == 0 &&
6038	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6039	>	boolean created = false;
6040	>	try {               // Recheck under lock
6041	>	CounterCell[] rs; int m, j;
6042	>	if ((rs = counterCells) != null &&
6043	>	(m = rs.length) > 0 &&
6044	>	rs[j = (m - 1) & h] == null) {
6045	>	rs[j] = r;
6046	>	created = true;
6047	>	}
6048	>	} finally {
6049	>	cellsBusy = 0;
6050	>	}
6051	>	if (created)
6052	>	break;
6053	>	continue;           // Slot is now non-empty
6054		}
6055	<	if ((par = t.parent) == null ||
6056	<	!(par instanceof MapReduceMappingsToIntTask)) {
6057	<	t.quietlyComplete();
6058	<	break;
6055	>	}
6056	>	collide = false;
6057	>	}
6058	>	else if (!wasUncontended)       // CAS already known to fail
6059	>	wasUncontended = true;      // Continue after rehash
6060	>	else if (U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))
6061	>	break;
6062	>	else if (counterCells != as || n >= NCPU)
6063	>	collide = false;            // At max size or stale
6064	>	else if (!collide)
6065	>	collide = true;
6066	>	else if (cellsBusy == 0 &&
6067	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6068	>	try {
6069	>	if (counterCells == as) {// Expand table unless stale
6070	>	CounterCell[] rs = new CounterCell[n << 1];
6071	>	for (int i = 0; i < n; ++i)
6072	>	rs[i] = as[i];
6073	>	counterCells = rs;
6074		}
6075	<	t = (MapReduceMappingsToIntTask<K,V>)par;
6075	>	} finally {
6076	>	cellsBusy = 0;
6077		}
6078	<	else if (t.casPending(c, c - 1))
6079	<	break;
6078	>	collide = false;
6079	>	continue;                   // Retry with expanded table
6080		}
6081	<	} catch (Throwable ex) {
6082	<	return tryCompleteComputation(ex);
6081	>	h ^= h << 13;                   // Rehash
6082	>	h ^= h >>> 17;
6083	>	h ^= h << 5;
6084	>	}
6085	>	else if (cellsBusy == 0 && counterCells == as &&
6086	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6087	>	boolean init = false;
6088	>	try {                           // Initialize table
6089	>	if (counterCells == as) {
6090	>	CounterCell[] rs = new CounterCell[2];
6091	>	rs[h & 1] = new CounterCell(x);
6092	>	counterCells = rs;
6093	>	init = true;
6094	>	}
6095	>	} finally {
6096	>	cellsBusy = 0;
6097	>	}
6098	>	if (init)
6099	>	break;
6100		}
6101	<	return false;
6101	>	else if (U.compareAndSwapLong(this, BASECOUNT, v = baseCount, v + x))
6102	>	break;                          // Fall back on using base
6103		}
6104	<	public final Integer getRawResult() { return result; }
6104	>	hc.code = h;                            // Record index for next time
6105		}
6106
6516	–
6107		// Unsafe mechanics
6108	<	private static final sun.misc.Unsafe UNSAFE;
6109	<	private static final long counterOffset;
6110	<	private static final long sizeCtlOffset;
6108	>	private static final sun.misc.Unsafe U;
6109	>	private static final long SIZECTL;
6110	>	private static final long TRANSFERINDEX;
6111	>	private static final long TRANSFERORIGIN;
6112	>	private static final long BASECOUNT;
6113	>	private static final long CELLSBUSY;
6114	>	private static final long CELLVALUE;
6115		private static final long ABASE;
6116		private static final int ASHIFT;
6117
6118		static {
6525	–	int ss;
6119		try {
6120	<	UNSAFE = getUnsafe();
6120	>	U = getUnsafe();
6121		Class<?> k = ConcurrentHashMapV8.class;
6122	<	counterOffset = UNSAFE.objectFieldOffset
6530	<	(k.getDeclaredField("counter"));
6531	<	sizeCtlOffset = UNSAFE.objectFieldOffset
6122	>	SIZECTL = U.objectFieldOffset
6123		(k.getDeclaredField("sizeCtl"));
6124	<	Class<?> sc = Node[].class;
6125	<	ABASE = UNSAFE.arrayBaseOffset(sc);
6126	<	ss = UNSAFE.arrayIndexScale(sc);
6124	>	TRANSFERINDEX = U.objectFieldOffset
6125	>	(k.getDeclaredField("transferIndex"));
6126	>	TRANSFERORIGIN = U.objectFieldOffset
6127	>	(k.getDeclaredField("transferOrigin"));
6128	>	BASECOUNT = U.objectFieldOffset
6129	>	(k.getDeclaredField("baseCount"));
6130	>	CELLSBUSY = U.objectFieldOffset
6131	>	(k.getDeclaredField("cellsBusy"));
6132	>	Class<?> ck = CounterCell.class;
6133	>	CELLVALUE = U.objectFieldOffset
6134	>	(ck.getDeclaredField("value"));
6135	>	Class<?> ak = Node[].class;
6136	>	ABASE = U.arrayBaseOffset(ak);
6137	>	int scale = U.arrayIndexScale(ak);
6138	>	if ((scale & (scale - 1)) != 0)
6139	>	throw new Error("data type scale not a power of two");
6140	>	ASHIFT = 31 - Integer.numberOfLeadingZeros(scale);
6141		} catch (Exception e) {
6142		throw new Error(e);
6143		}
6539	–	if ((ss & (ss-1)) != 0)
6540	–	throw new Error("data type scale not a power of two");
6541	–	ASHIFT = 31 - Integer.numberOfLeadingZeros(ss);
6144		}
6145
6146		/**
#	Line 6551 | Line 6153 | public class ConcurrentHashMapV8<K, V>
6153		private static sun.misc.Unsafe getUnsafe() {
6154		try {
6155		return sun.misc.Unsafe.getUnsafe();
6156	<	} catch (SecurityException se) {
6157	<	try {
6158	<	return java.security.AccessController.doPrivileged
6159	<	(new java.security
6160	<	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6161	<	public sun.misc.Unsafe run() throws Exception {
6162	<	java.lang.reflect.Field f = sun.misc
6163	<	.Unsafe.class.getDeclaredField("theUnsafe");
6164	<	f.setAccessible(true);
6165	<	return (sun.misc.Unsafe) f.get(null);
6166	<	}});
6167	<	} catch (java.security.PrivilegedActionException e) {
6168	<	throw new RuntimeException("Could not initialize intrinsics",
6169	<	e.getCause());
6170	<	}
6156	>	} catch (SecurityException tryReflectionInstead) {}
6157	>	try {
6158	>	return java.security.AccessController.doPrivileged
6159	>	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6160	>	public sun.misc.Unsafe run() throws Exception {
6161	>	Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
6162	>	for (java.lang.reflect.Field f : k.getDeclaredFields()) {
6163	>	f.setAccessible(true);
6164	>	Object x = f.get(null);
6165	>	if (k.isInstance(x))
6166	>	return k.cast(x);
6167	>	}
6168	>	throw new NoSuchFieldError("the Unsafe");
6169	>	}});
6170	>	} catch (java.security.PrivilegedActionException e) {
6171	>	throw new RuntimeException("Could not initialize intrinsics",
6172	>	e.getCause());
6173		}
6174		}
6175		}

Diff Legend

–	Removed lines
+	Added lines
<	Changed lines
>	Changed lines