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Comparing jsr166/src/jsr166e/ConcurrentHashMapV8.java (file contents):
Revision 1.22 by jsr166, Sat Sep 10 19:33:14 2011 UTC vs.
Revision 1.57 by dl, Mon Aug 13 19:52:33 2012 UTC

#	Line 6 | Line 6
6
7		package jsr166e;
8		import jsr166e.LongAdder;
9	+	import jsr166e.ForkJoinPool;
10	+	import jsr166e.ForkJoinTask;
11	+
12	+	import java.util.Comparator;
13	+	import java.util.Arrays;
14		import java.util.Map;
15		import java.util.Set;
16		import java.util.Collection;
#	Line 19 | Line 24 | import java.util.Enumeration;
24		import java.util.ConcurrentModificationException;
25		import java.util.NoSuchElementException;
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;
30	+	import java.util.concurrent.atomic.AtomicReference;
31	+
32		import java.io.Serializable;
33
34		/**
#	Line 54 | Line 64 | import java.io.Serializable;
64		* <p> The table is dynamically expanded when there are too many
65		* collisions (i.e., keys that have distinct hash codes but fall into
66		* the same slot modulo the table size), with the expected average
67	<	* effect of maintaining roughly two bins per mapping. There may be
68	<	* much variance around this average as mappings are added and
69	<	* removed, but overall, this maintains a commonly accepted time/space
70	<	* tradeoff for hash tables.  However, resizing this or any other kind
71	<	* of hash table may be a relatively slow operation. When possible, it
72	<	* is a good idea to provide a size estimate as an optional {@code
67	>	* effect of maintaining roughly two bins per mapping (corresponding
68	>	* to a 0.75 load factor threshold for resizing). There may be much
69	>	* variance around this average as mappings are added and removed, but
70	>	* overall, this maintains a commonly accepted time/space tradeoff for
71	>	* hash tables.  However, resizing this or any other kind of hash
72	>	* table may be a relatively slow operation. When possible, it is a
73	>	* good idea to provide a size estimate as an optional {@code
74		* initialCapacity} constructor argument. An additional optional
75		* {@code loadFactor} constructor argument provides a further means of
76		* customizing initial table capacity by specifying the table density
#	Line 68 | Line 79 | import java.io.Serializable;
79		* versions of this class, constructors may optionally specify an
80		* expected {@code concurrencyLevel} as an additional hint for
81		* internal sizing.  Note that using many keys with exactly the same
82	<	* {@code hashCode{}} is a sure way to slow down performance of any
82	>	* {@code hashCode()} is a sure way to slow down performance of any
83		* hash table.
84		*
85		* <p>This class and its views and iterators implement all of the
#	Line 83 | Line 94 | import java.io.Serializable;
94		* Java Collections Framework</a>.
95		*
96		* <p><em>jsr166e note: This class is a candidate replacement for
97	<	* java.util.concurrent.ConcurrentHashMap.<em>
97	>	* java.util.concurrent.ConcurrentHashMap.  During transition, this
98	>	* class declares and uses nested functional interfaces with different
99	>	* names but the same forms as those expected for JDK8.<em>
100		*
101		* @since 1.5
102		* @author Doug Lea
#	Line 91 | Line 104 | import java.io.Serializable;
104		* @param <V> the type of mapped values
105		*/
106		public class ConcurrentHashMapV8<K, V>
107	<	implements ConcurrentMap<K, V>, Serializable {
107	>	implements ConcurrentMap<K, V>, Serializable {
108		private static final long serialVersionUID = 7249069246763182397L;
109
110		/**
111	<	* A function computing a mapping from the given key to a value,
112	<	* or {@code null} if there is no mapping. This is a place-holder
113	<	* for an upcoming JDK8 interface.
114	<	*/
115	<	public static interface MappingFunction<K, V> {
116	<	/**
117	<	* Returns a value for the given key, or null if there is no
118	<	* mapping. If this function throws an (unchecked) exception,
119	<	* the exception is rethrown to its caller, and no mapping is
120	<	* recorded.  Because this function is invoked within
121	<	* atomicity control, the computation should be short and
122	<	* simple. The most common usage is to construct a new object
123	<	* serving as an initial mapped value.
111	>	* A partitionable iterator. A Spliterator can be traversed
112	>	* directly, but can also be partitioned (before traversal) by
113	>	* creating another Spliterator that covers a non-overlapping
114	>	* portion of the elements, and so may be amenable to parallel
115	>	* execution.
116	>	*
117	>	* <p> This interface exports a subset of expected JDK8
118	>	* functionality.
119	>	*
120	>	* <p>Sample usage: Here is one (of the several) ways to compute
121	>	* the sum of the values held in a map using the ForkJoin
122	>	* framework. As illustrated here, Spliterators are well suited to
123	>	* designs in which a task repeatedly splits off half its work
124	>	* into forked subtasks until small enough to process directly,
125	>	* and then joins these subtasks. Variants of this style can also
126	>	* be used in completion-based designs.
127	>	*
128	>	* <pre>
129	>	* {@code ConcurrentHashMapV8<String, Long> m = ...
130	>	* // split as if have 8 * parallelism, for load balance
131	>	* int n = m.size();
132	>	* int p = aForkJoinPool.getParallelism() * 8;
133	>	* int split = (n < p)? n : p;
134	>	* long sum = aForkJoinPool.invoke(new SumValues(m.valueSpliterator(), split, null));
135	>	* // ...
136	>	* static class SumValues extends RecursiveTask<Long> {
137	>	*   final Spliterator<Long> s;
138	>	*   final int split;             // split while > 1
139	>	*   final SumValues nextJoin;    // records forked subtasks to join
140	>	*   SumValues(Spliterator<Long> s, int depth, SumValues nextJoin) {
141	>	*     this.s = s; this.depth = depth; this.nextJoin = nextJoin;
142	>	*   }
143	>	*   public Long compute() {
144	>	*     long sum = 0;
145	>	*     SumValues subtasks = null; // fork subtasks
146	>	*     for (int s = split >>> 1; s > 0; s >>>= 1)
147	>	*       (subtasks = new SumValues(s.split(), s, subtasks)).fork();
148	>	*     while (s.hasNext())        // directly process remaining elements
149	>	*       sum += s.next();
150	>	*     for (SumValues t = subtasks; t != null; t = t.nextJoin)
151	>	*       sum += t.join();         // collect subtask results
152	>	*     return sum;
153	>	*   }
154	>	* }
155	>	* }</pre>
156	>	*/
157	>	public static interface Spliterator<T> extends Iterator<T> {
158	>	/**
159	>	* Returns a Spliterator covering approximately half of the
160	>	* elements, guaranteed not to overlap with those subsequently
161	>	* returned by this Spliterator.  After invoking this method,
162	>	* the current Spliterator will <em>not</em> produce any of
163	>	* the elements of the returned Spliterator, but the two
164	>	* Spliterators together will produce all of the elements that
165	>	* would have been produced by this Spliterator had this
166	>	* method not been called. The exact number of elements
167	>	* produced by the returned Spliterator is not guaranteed, and
168	>	* may be zero (i.e., with {@code hasNext()} reporting {@code
169	>	* false}) if this Spliterator cannot be further split.
170		*
171	<	* @param key the (non-null) key
172	<	* @return a value, or null if none
171	>	* @return a Spliterator covering approximately half of the
172	>	* elements
173	>	* @throws IllegalStateException if this Spliterator has
174	>	* already commenced traversing elements
175		*/
176	<	V map(K key);
176	>	Spliterator<T> split();
177		}
178
179		/*
#	Line 121 | Line 182 | public class ConcurrentHashMapV8<K, V>
182		* The primary design goal of this hash table is to maintain
183		* concurrent readability (typically method get(), but also
184		* iterators and related methods) while minimizing update
185	<	* contention.
185	>	* contention. Secondary goals are to keep space consumption about
186	>	* the same or better than java.util.HashMap, and to support high
187	>	* initial insertion rates on an empty table by many threads.
188		*
189		* Each key-value mapping is held in a Node.  Because Node fields
190		* can contain special values, they are defined using plain Object
#	Line 129 | Line 192 | public class ConcurrentHashMapV8<K, V>
192		* work off Object types. And similarly, so do the internal
193		* methods of auxiliary iterator and view classes.  All public
194		* generic typed methods relay in/out of these internal methods,
195	<	* supplying null-checks and casts as needed.
195	>	* supplying null-checks and casts as needed. This also allows
196	>	* many of the public methods to be factored into a smaller number
197	>	* of internal methods (although sadly not so for the five
198	>	* variants of put-related operations). The validation-based
199	>	* approach explained below leads to a lot of code sprawl because
200	>	* retry-control precludes factoring into smaller methods.
201		*
202		* The table is lazily initialized to a power-of-two size upon the
203	<	* first insertion.  Each bin in the table contains a list of
204	<	* Nodes (most often, zero or one Node).  Table accesses require
205	<	* volatile/atomic reads, writes, and CASes.  Because there is no
206	<	* other way to arrange this without adding further indirections,
207	<	* we use intrinsics (sun.misc.Unsafe) operations.  The lists of
208	<	* nodes within bins are always accurately traversable under
209	<	* volatile reads, so long as lookups check hash code and
210	<	* non-nullness of value before checking key equality. (All valid
211	<	* hash codes are nonnegative. Negative values are reserved for
212	<	* special forwarding nodes; see below.)
203	>	* first insertion.  Each bin in the table normally contains a
204	>	* list of Nodes (most often, the list has only zero or one Node).
205	>	* Table accesses require volatile/atomic reads, writes, and
206	>	* CASes.  Because there is no other way to arrange this without
207	>	* adding further indirections, we use intrinsics
208	>	* (sun.misc.Unsafe) operations.  The lists of nodes within bins
209	>	* are always accurately traversable under volatile reads, so long
210	>	* as lookups check hash code and non-nullness of value before
211	>	* checking key equality.
212	>	*
213	>	* We use the top two bits of Node hash fields for control
214	>	* purposes -- they are available anyway because of addressing
215	>	* constraints.  As explained further below, these top bits are
216	>	* used as follows:
217	>	*  00 - Normal
218	>	*  01 - Locked
219	>	*  11 - Locked and may have a thread waiting for lock
220	>	*  10 - Node is a forwarding node
221	>	*
222	>	* The lower 30 bits of each Node's hash field contain a
223	>	* transformation of the key's hash code, except for forwarding
224	>	* nodes, for which the lower bits are zero (and so always have
225	>	* hash field == MOVED).
226		*
227	<	* Insertion (via put or putIfAbsent) of the first node in an
227	>	* Insertion (via put or its variants) of the first node in an
228		* empty bin is performed by just CASing it to the bin.  This is
229	<	* on average by far the most common case for put operations.
230	<	* Other update operations (insert, delete, and replace) require
231	<	* locks.  We do not want to waste the space required to associate
232	<	* a distinct lock object with each bin, so instead use the first
233	<	* node of a bin list itself as a lock, using plain "synchronized"
234	<	* locks. These save space and we can live with block-structured
235	<	* lock/unlock operations. Using the first node of a list as a
236	<	* lock does not by itself suffice though: When a node is locked,
237	<	* any update must first validate that it is still the first node,
238	<	* and retry if not. Because new nodes are always appended to
239	<	* lists, once a node is first in a bin, it remains first until
240	<	* deleted or the bin becomes invalidated.  However, operations
241	<	* that only conditionally update can and sometimes do inspect
242	<	* nodes until the point of update. This is a converse of sorts to
243	<	* the lazy locking technique described by Herlihy & Shavit.
229	>	* by far the most common case for put operations under most
230	>	* key/hash distributions.  Other update operations (insert,
231	>	* delete, and replace) require locks.  We do not want to waste
232	>	* the space required to associate a distinct lock object with
233	>	* each bin, so instead use the first node of a bin list itself as
234	>	* a lock. Blocking support for these locks relies on the builtin
235	>	* "synchronized" monitors.  However, we also need a tryLock
236	>	* construction, so we overlay these by using bits of the Node
237	>	* hash field for lock control (see above), and so normally use
238	>	* builtin monitors only for blocking and signalling using
239	>	* wait/notifyAll constructions. See Node.tryAwaitLock.
240	>	*
241	>	* Using the first node of a list as a lock does not by itself
242	>	* suffice though: When a node is locked, any update must first
243	>	* validate that it is still the first node after locking it, and
244	>	* retry if not. Because new nodes are always appended to lists,
245	>	* once a node is first in a bin, it remains first until deleted
246	>	* or the bin becomes invalidated (upon resizing).  However,
247	>	* operations that only conditionally update may inspect nodes
248	>	* until the point of update. This is a converse of sorts to the
249	>	* lazy locking technique described by Herlihy & Shavit.
250		*
251	<	* The main disadvantage of this approach is that most update
251	>	* The main disadvantage of per-bin locks is that other update
252		* operations on other nodes in a bin list protected by the same
253		* lock can stall, for example when user equals() or mapping
254	<	* functions take a long time.  However, statistically, this is
255	<	* not a common enough problem to outweigh the time/space overhead
256	<	* of alternatives: Under random hash codes, the frequency of
170	<	* nodes in bins follows a Poisson distribution
254	>	* functions take a long time.  However, statistically, under
255	>	* random hash codes, this is not a common problem.  Ideally, the
256	>	* frequency of nodes in bins follows a Poisson distribution
257		* (http://en.wikipedia.org/wiki/Poisson_distribution) with a
258		* parameter of about 0.5 on average, given the resizing threshold
259		* of 0.75, although with a large variance because of resizing
260		* granularity. Ignoring variance, the expected occurrences of
261		* list size k are (exp(-0.5) * pow(0.5, k) / factorial(k)). The
262	<	* first few values are:
262	>	* first values are:
263		*
264	<	* 0:    0.607
265	<	* 1:    0.303
266	<	* 2:    0.076
267	<	* 3:    0.012
268	<	* more: 0.002
264	>	* 0:    0.60653066
265	>	* 1:    0.30326533
266	>	* 2:    0.07581633
267	>	* 3:    0.01263606
268	>	* 4:    0.00157952
269	>	* 5:    0.00015795
270	>	* 6:    0.00001316
271	>	* 7:    0.00000094
272	>	* 8:    0.00000006
273	>	* more: less than 1 in ten million
274		*
275		* Lock contention probability for two threads accessing distinct
276	<	* elements is roughly 1 / (8 * #elements).  Function "spread"
277	<	* performs hashCode randomization that improves the likelihood
278	<	* that these assumptions hold unless users define exactly the
279	<	* same value for too many hashCodes.
280	<	*
281	<	* The table is resized when occupancy exceeds a threshold.  Only
282	<	* a single thread performs the resize (using field "resizing", to
283	<	* arrange exclusion), but the table otherwise remains usable for
284	<	* reads and updates. Resizing proceeds by transferring bins, one
285	<	* by one, from the table to the next table.  Upon transfer, the
286	<	* old table bin contains only a special forwarding node (with
287	<	* negative hash field) that contains the next table as its
288	<	* key. On encountering a forwarding node, access and update
289	<	* operations restart, using the new table. To ensure concurrent
290	<	* readability of traversals, transfers must proceed from the last
291	<	* bin (table.length - 1) up towards the first.  Upon seeing a
292	<	* forwarding node, traversals (see class InternalIterator)
293	<	* arrange to move to the new table for the rest of the traversal
294	<	* without revisiting nodes.  This constrains bin transfers to a
295	<	* particular order, and so can block indefinitely waiting for the
296	<	* next lock, and other threads cannot help with the transfer.
297	<	* However, expected stalls are infrequent enough to not warrant
298	<	* the additional overhead of access and iteration schemes that
299	<	* could admit out-of-order or concurrent bin transfers.
300	<	*
301	<	* This traversal scheme also applies to partial traversals of
302	<	* ranges of bins (via an alternate InternalIterator constructor)
303	<	* to support partitioned aggregate operations (that are not
304	<	* otherwise implemented yet).  Also, read-only operations give up
305	<	* if ever forwarded to a null table, which provides support for
306	<	* shutdown-style clearing, which is also not currently
307	<	* implemented.
276	>	* elements is roughly 1 / (8 * #elements) under random hashes.
277	>	*
278	>	* Actual hash code distributions encountered in practice
279	>	* sometimes deviate significantly from uniform randomness.  This
280	>	* includes the case when N > (1<<30), so some keys MUST collide.
281	>	* Similarly for dumb or hostile usages in which multiple keys are
282	>	* designed to have identical hash codes. Also, although we guard
283	>	* against the worst effects of this (see method spread), sets of
284	>	* hashes may differ only in bits that do not impact their bin
285	>	* index for a given power-of-two mask.  So we use a secondary
286	>	* strategy that applies when the number of nodes in a bin exceeds
287	>	* a threshold, and at least one of the keys implements
288	>	* Comparable.  These TreeBins use a balanced tree to hold nodes
289	>	* (a specialized form of red-black trees), bounding search time
290	>	* to O(log N).  Each search step in a TreeBin is around twice as
291	>	* slow as in a regular list, but given that N cannot exceed
292	>	* (1<<64) (before running out of addresses) this bounds search
293	>	* steps, lock hold times, etc, to reasonable constants (roughly
294	>	* 100 nodes inspected per operation worst case) so long as keys
295	>	* are Comparable (which is very common -- String, Long, etc).
296	>	* TreeBin nodes (TreeNodes) also maintain the same "next"
297	>	* traversal pointers as regular nodes, so can be traversed in
298	>	* iterators in the same way.
299	>	*
300	>	* The table is resized when occupancy exceeds a percentage
301	>	* threshold (nominally, 0.75, but see below).  Only a single
302	>	* thread performs the resize (using field "sizeCtl", to arrange
303	>	* exclusion), but the table otherwise remains usable for reads
304	>	* and updates. Resizing proceeds by transferring bins, one by
305	>	* one, from the table to the next table.  Because we are using
306	>	* power-of-two expansion, the elements from each bin must either
307	>	* stay at same index, or move with a power of two offset. We
308	>	* eliminate unnecessary node creation by catching cases where old
309	>	* nodes can be reused because their next fields won't change.  On
310	>	* average, only about one-sixth of them need cloning when a table
311	>	* doubles. The nodes they replace will be garbage collectable as
312	>	* soon as they are no longer referenced by any reader thread that
313	>	* may be in the midst of concurrently traversing table.  Upon
314	>	* transfer, the old table bin contains only a special forwarding
315	>	* node (with hash field "MOVED") that contains the next table as
316	>	* its key. On encountering a forwarding node, access and update
317	>	* operations restart, using the new table.
318	>	*
319	>	* Each bin transfer requires its bin lock. However, unlike other
320	>	* cases, a transfer can skip a bin if it fails to acquire its
321	>	* lock, and revisit it later (unless it is a TreeBin). Method
322	>	* rebuild maintains a buffer of TRANSFER_BUFFER_SIZE bins that
323	>	* have been skipped because of failure to acquire a lock, and
324	>	* blocks only if none are available (i.e., only very rarely).
325	>	* The transfer operation must also ensure that all accessible
326	>	* bins in both the old and new table are usable by any traversal.
327	>	* When there are no lock acquisition failures, this is arranged
328	>	* simply by proceeding from the last bin (table.length - 1) up
329	>	* towards the first.  Upon seeing a forwarding node, traversals
330	>	* (see class Iter) arrange to move to the new table
331	>	* without revisiting nodes.  However, when any node is skipped
332	>	* during a transfer, all earlier table bins may have become
333	>	* visible, so are initialized with a reverse-forwarding node back
334	>	* to the old table until the new ones are established. (This
335	>	* sometimes requires transiently locking a forwarding node, which
336	>	* is possible under the above encoding.) These more expensive
337	>	* mechanics trigger only when necessary.
338	>	*
339	>	* The traversal scheme also applies to partial traversals of
340	>	* ranges of bins (via an alternate Traverser constructor)
341	>	* to support partitioned aggregate operations.  Also, read-only
342	>	* operations give up if ever forwarded to a null table, which
343	>	* provides support for shutdown-style clearing, which is also not
344	>	* currently implemented.
345		*
346		* Lazy table initialization minimizes footprint until first use,
347		* and also avoids resizings when the first operation is from a
348		* putAll, constructor with map argument, or deserialization.
349	<	* These cases attempt to override the targetCapacity used in
350	<	* growTable. These harmlessly fail to take effect in cases of
223	<	* races with other ongoing resizings. Uses of the threshold and
224	<	* targetCapacity during attempted initializations or resizings
225	<	* are racy but fall back on checks to preserve correctness.
349	>	* These cases attempt to override the initial capacity settings,
350	>	* but harmlessly fail to take effect in cases of races.
351		*
352		* The element count is maintained using a LongAdder, which avoids
353		* contention on updates but can encounter cache thrashing if read
354		* too frequently during concurrent access. To avoid reading so
355	<	* often, resizing is normally attempted only upon adding to a bin
356	<	* already holding two or more nodes. Under uniform hash
357	<	* distributions, the probability of this occurring at threshold
358	<	* is around 13%, meaning that only about 1 in 8 puts check
359	<	* threshold (and after resizing, many fewer do so). But this
360	<	* approximation has high variance for small table sizes, so we
361	<	* check on any collision for sizes <= 64.  Further, to increase
362	<	* the probability that a resize occurs soon enough, we offset the
363	<	* threshold (see THRESHOLD_OFFSET) by the expected number of puts
364	<	* between checks.
355	>	* often, resizing is attempted either when a bin lock is
356	>	* contended, or upon adding to a bin already holding two or more
357	>	* nodes (checked before adding in the xIfAbsent methods, after
358	>	* adding in others). Under uniform hash distributions, the
359	>	* probability of this occurring at threshold is around 13%,
360	>	* meaning that only about 1 in 8 puts check threshold (and after
361	>	* resizing, many fewer do so). But this approximation has high
362	>	* variance for small table sizes, so we check on any collision
363	>	* for sizes <= 64. The bulk putAll operation further reduces
364	>	* contention by only committing count updates upon these size
365	>	* checks.
366		*
367		* Maintaining API and serialization compatibility with previous
368		* versions of this class introduces several oddities. Mainly: We
369		* leave untouched but unused constructor arguments refering to
370	<	* concurrencyLevel. We also declare an unused "Segment" class
371	<	* that is instantiated in minimal form only when serializing.
370	>	* concurrencyLevel. We accept a loadFactor constructor argument,
371	>	* but apply it only to initial table capacity (which is the only
372	>	* time that we can guarantee to honor it.) We also declare an
373	>	* unused "Segment" class that is instantiated in minimal form
374	>	* only when serializing.
375		*/
376
377		/* ---------------- Constants -------------- */
#	Line 250 | Line 379 | public class ConcurrentHashMapV8<K, V>
379		/**
380		* The largest possible table capacity.  This value must be
381		* exactly 1<<30 to stay within Java array allocation and indexing
382	<	* bounds for power of two table sizes.
382	>	* bounds for power of two table sizes, and is further required
383	>	* because the top two bits of 32bit hash fields are used for
384	>	* control purposes.
385		*/
386		private static final int MAXIMUM_CAPACITY = 1 << 30;
387
#	Line 261 | Line 392 | public class ConcurrentHashMapV8<K, V>
392		private static final int DEFAULT_CAPACITY = 16;
393
394		/**
395	<	* The load factor for this table. Overrides of this value in
396	<	* constructors affect only the initial table capacity.  The
266	<	* actual floating point value isn't normally used, because it is
267	<	* simpler to rely on the expression {@code n - (n >>> 2)} for the
268	<	* associated resizing threshold.
395	>	* The largest possible (non-power of two) array size.
396	>	* Needed by toArray and related methods.
397		*/
398	<	private static final float LOAD_FACTOR = 0.75f;
398	>	static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
399
400		/**
401	<	* The count value to offset thresholds to compensate for checking
402	<	* for the need to resize only when inserting into bins with two
275	<	* or more elements. See above for explanation.
401	>	* The default concurrency level for this table. Unused but
402	>	* defined for compatibility with previous versions of this class.
403		*/
404	<	private static final int THRESHOLD_OFFSET = 8;
404	>	private static final int DEFAULT_CONCURRENCY_LEVEL = 16;
405
406		/**
407	<	* The default concurrency level for this table. Unused except as
408	<	* a sizing hint, but defined for compatibility with previous
409	<	* versions of this class.
407	>	* The load factor for this table. Overrides of this value in
408	>	* constructors affect only the initial table capacity.  The
409	>	* actual floating point value isn't normally used -- it is
410	>	* simpler to use expressions such as {@code n - (n >>> 2)} for
411	>	* the associated resizing threshold.
412		*/
413	<	private static final int DEFAULT_CONCURRENCY_LEVEL = 16;
285	<
286	<	/* ---------------- Nodes -------------- */
413	>	private static final float LOAD_FACTOR = 0.75f;
414
415		/**
416	<	* Key-value entry. Note that this is never exported out as a
417	<	* user-visible Map.Entry. Nodes with a negative hash field are
418	<	* special, and do not contain user keys or values.  Otherwise,
292	<	* keys are never null, and null val fields indicate that a node
293	<	* is in the process of being deleted or created. For purposes of
294	<	* read-only, access, a key may be read before a val, but can only
295	<	* be used after checking val.  (For an update operation, when a
296	<	* lock is held on a node, order doesn't matter.)
416	>	* The buffer size for skipped bins during transfers. The
417	>	* value is arbitrary but should be large enough to avoid
418	>	* most locking stalls during resizes.
419		*/
420	<	static final class Node {
299	<	final int hash;
300	<	final Object key;
301	<	volatile Object val;
302	<	volatile Node next;
303	<
304	<	Node(int hash, Object key, Object val, Node next) {
305	<	this.hash = hash;
306	<	this.key = key;
307	<	this.val = val;
308	<	this.next = next;
309	<	}
310	<	}
420	>	private static final int TRANSFER_BUFFER_SIZE = 32;
421
422		/**
423	<	* Sign bit of node hash value indicating to use table in node.key.
423	>	* The bin count threshold for using a tree rather than list for a
424	>	* bin.  The value reflects the approximate break-even point for
425	>	* using tree-based operations.
426	>	*/
427	>	private static final int TREE_THRESHOLD = 8;
428	>
429	>	/*
430	>	* Encodings for special uses of Node hash fields. See above for
431	>	* explanation.
432		*/
433	<	private static final int SIGN_BIT = 0x80000000;
433	>	static final int MOVED     = 0x80000000; // hash field for forwarding nodes
434	>	static final int LOCKED    = 0x40000000; // set/tested only as a bit
435	>	static final int WAITING   = 0xc0000000; // both bits set/tested together
436	>	static final int HASH_BITS = 0x3fffffff; // usable bits of normal node hash
437
438		/* ---------------- Fields -------------- */
439
#	Line 322 | Line 443 | public class ConcurrentHashMapV8<K, V>
443		*/
444		transient volatile Node[] table;
445
446	<	/** The counter maintaining number of elements. */
446	>	/**
447	>	* The counter maintaining number of elements.
448	>	*/
449		private transient final LongAdder counter;
450	<	/** Nonzero when table is being initialized or resized. Updated via CAS. */
451	<	private transient volatile int resizing;
452	<	/** The next element count value upon which to resize the table. */
453	<	private transient int threshold;
454	<	/** The target capacity; volatile to cover initialization races. */
455	<	private transient volatile int targetCapacity;
450	>
451	>	/**
452	>	* Table initialization and resizing control.  When negative, the
453	>	* table is being initialized or resized. Otherwise, when table is
454	>	* null, holds the initial table size to use upon creation, or 0
455	>	* for default. After initialization, holds the next element count
456	>	* value upon which to resize the table.
457	>	*/
458	>	private transient volatile int sizeCtl;
459
460		// views
461		private transient KeySet<K,V> keySet;
#	Line 353 | Line 479 | public class ConcurrentHashMapV8<K, V>
479		* inline assignments below.
480		*/
481
482	<	static final Node tabAt(Node[] tab, int i) { // used by InternalIterator
482	>	static final Node tabAt(Node[] tab, int i) { // used by Iter
483		return (Node)UNSAFE.getObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE);
484		}
485
#	Line 365 | Line 491 | public class ConcurrentHashMapV8<K, V>
491		UNSAFE.putObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE, v);
492		}
493
494	<	/* ----------------Table Initialization and Resizing -------------- */
494	>	/* ---------------- Nodes -------------- */
495
496		/**
497	<	* Returns a power of two table size for the given desired capacity.
498	<	* See Hackers Delight, sec 3.2
497	>	* Key-value entry. Note that this is never exported out as a
498	>	* user-visible Map.Entry (see MapEntry below). Nodes with a hash
499	>	* field of MOVED are special, and do not contain user keys or
500	>	* values.  Otherwise, keys are never null, and null val fields
501	>	* indicate that a node is in the process of being deleted or
502	>	* created. For purposes of read-only access, a key may be read
503	>	* before a val, but can only be used after checking val to be
504	>	* non-null.
505		*/
506	<	private static final int tableSizeFor(int c) {
507	<	int n = c - 1;
508	<	n |= n >>> 1;
509	<	n |= n >>> 2;
510	<	n |= n >>> 4;
379	<	n |= n >>> 8;
380	<	n |= n >>> 16;
381	<	return (n < 0) ? 1 : (n >= MAXIMUM_CAPACITY) ? MAXIMUM_CAPACITY : n + 1;
382	<	}
506	>	static class Node {
507	>	volatile int hash;
508	>	final Object key;
509	>	volatile Object val;
510	>	volatile Node next;
511
512	<	/**
513	<	* If not already resizing, initializes or creates next table and
514	<	* transfers bins. Initial table size uses the capacity recorded
515	<	* in targetCapacity.  Rechecks occupancy after a transfer to see
516	<	* if another resize is already needed because resizings are
517	<	* lagging additions.
518	<	*
519	<	* @return current table
520	<	*/
521	<	private final Node[] growTable() {
522	<	if (resizing == 0 &&
523	<	UNSAFE.compareAndSwapInt(this, resizingOffset, 0, 1)) {
524	<	try {
525	<	for (;;) {
526	<	Node[] tab = table;
527	<	int n, c, m;
528	<	if (tab == null)
529	<	n = (c = targetCapacity) > 0 ? c : DEFAULT_CAPACITY;
530	<	else if ((m = tab.length) < MAXIMUM_CAPACITY &&
531	<	counter.sum() >= (long)threshold)
532	<	n = m << 1;
533	<	else
534	<	break;
535	<	threshold = n - (n >>> 2) - THRESHOLD_OFFSET;
536	<	Node[] nextTab = new Node[n];
537	<	if (tab != null)
538	<	transfer(tab, nextTab,
539	<	new Node(SIGN_BIT, nextTab, null, null));
540	<	table = nextTab;
541	<	if (tab == null)
512	>	Node(int hash, Object key, Object val, Node next) {
513	>	this.hash = hash;
514	>	this.key = key;
515	>	this.val = val;
516	>	this.next = next;
517	>	}
518	>
519	>	/** CompareAndSet the hash field */
520	>	final boolean casHash(int cmp, int val) {
521	>	return UNSAFE.compareAndSwapInt(this, hashOffset, cmp, val);
522	>	}
523	>
524	>	/** The number of spins before blocking for a lock */
525	>	static final int MAX_SPINS =
526	>	Runtime.getRuntime().availableProcessors() > 1 ? 64 : 1;
527	>
528	>	/**
529	>	* Spins a while if LOCKED bit set and this node is the first
530	>	* of its bin, and then sets WAITING bits on hash field and
531	>	* blocks (once) if they are still set.  It is OK for this
532	>	* method to return even if lock is not available upon exit,
533	>	* which enables these simple single-wait mechanics.
534	>	*
535	>	* The corresponding signalling operation is performed within
536	>	* callers: Upon detecting that WAITING has been set when
537	>	* unlocking lock (via a failed CAS from non-waiting LOCKED
538	>	* state), unlockers acquire the sync lock and perform a
539	>	* notifyAll.
540	>	*/
541	>	final void tryAwaitLock(Node[] tab, int i) {
542	>	if (tab != null && i >= 0 && i < tab.length) { // bounds check
543	>	int r = ThreadLocalRandom.current().nextInt(); // randomize spins
544	>	int spins = MAX_SPINS, h;
545	>	while (tabAt(tab, i) == this && ((h = hash) & LOCKED) != 0) {
546	>	if (spins >= 0) {
547	>	r ^= r << 1; r ^= r >>> 3; r ^= r << 10; // xorshift
548	>	if (r >= 0 && --spins == 0)
549	>	Thread.yield();  // yield before block
550	>	}
551	>	else if (casHash(h, h | WAITING)) {
552	>	synchronized (this) {
553	>	if (tabAt(tab, i) == this &&
554	>	(hash & WAITING) == WAITING) {
555	>	try {
556	>	wait();
557	>	} catch (InterruptedException ie) {
558	>	Thread.currentThread().interrupt();
559	>	}
560	>	}
561	>	else
562	>	notifyAll(); // possibly won race vs signaller
563	>	}
564		break;
565	+	}
566		}
416	–	} finally {
417	–	resizing = 0;
567		}
568		}
569	<	else if (table == null)
570	<	Thread.yield(); // lost initialization race; just spin
571	<	return table;
569	>
570	>	// Unsafe mechanics for casHash
571	>	private static final sun.misc.Unsafe UNSAFE;
572	>	private static final long hashOffset;
573	>
574	>	static {
575	>	try {
576	>	UNSAFE = getUnsafe();
577	>	Class<?> k = Node.class;
578	>	hashOffset = UNSAFE.objectFieldOffset
579	>	(k.getDeclaredField("hash"));
580	>	} catch (Exception e) {
581	>	throw new Error(e);
582	>	}
583	>	}
584	>	}
585	>
586	>	/* ---------------- TreeBins -------------- */
587	>
588	>	/**
589	>	* Nodes for use in TreeBins
590	>	*/
591	>	static final class TreeNode extends Node {
592	>	TreeNode parent;  // red-black tree links
593	>	TreeNode left;
594	>	TreeNode right;
595	>	TreeNode prev;    // needed to unlink next upon deletion
596	>	boolean red;
597	>
598	>	TreeNode(int hash, Object key, Object val, Node next, TreeNode parent) {
599	>	super(hash, key, val, next);
600	>	this.parent = parent;
601	>	}
602		}
603
604		/**
605	<	* Reclassifies nodes in each bin to new table.  Because we are
606	<	* using power-of-two expansion, the elements from each bin must
428	<	* either stay at same index, or move with a power of two
429	<	* offset. We eliminate unnecessary node creation by catching
430	<	* cases where old nodes can be reused because their next fields
431	<	* won't change.  Statistically, only about one-sixth of them need
432	<	* cloning when a table doubles. The nodes they replace will be
433	<	* garbage collectable as soon as they are no longer referenced by
434	<	* any reader thread that may be in the midst of concurrently
435	<	* traversing table.
605	>	* A specialized form of red-black tree for use in bins
606	>	* whose size exceeds a threshold.
607		*
608	<	* Transfers are done from the bottom up to preserve iterator
609	<	* traversability. On each step, the old bin is locked,
610	<	* moved/copied, and then replaced with a forwarding node.
608	>	* TreeBins use a special form of comparison for search and
609	>	* related operations (which is the main reason we cannot use
610	>	* existing collections such as TreeMaps). TreeBins contain
611	>	* Comparable elements, but may contain others, as well as
612	>	* elements that are Comparable but not necessarily Comparable<T>
613	>	* for the same T, so we cannot invoke compareTo among them. To
614	>	* handle this, the tree is ordered primarily by hash value, then
615	>	* by getClass().getName() order, and then by Comparator order
616	>	* among elements of the same class.  On lookup at a node, if
617	>	* elements are not comparable or compare as 0, both left and
618	>	* right children may need to be searched in the case of tied hash
619	>	* values. (This corresponds to the full list search that would be
620	>	* necessary if all elements were non-Comparable and had tied
621	>	* hashes.)  The red-black balancing code is updated from
622	>	* pre-jdk-collections
623	>	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
624	>	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
625	>	* Algorithms" (CLR).
626	>	*
627	>	* TreeBins also maintain a separate locking discipline than
628	>	* regular bins. Because they are forwarded via special MOVED
629	>	* nodes at bin heads (which can never change once established),
630	>	* we cannot use those nodes as locks. Instead, TreeBin
631	>	* extends AbstractQueuedSynchronizer to support a simple form of
632	>	* read-write lock. For update operations and table validation,
633	>	* the exclusive form of lock behaves in the same way as bin-head
634	>	* locks. However, lookups use shared read-lock mechanics to allow
635	>	* multiple readers in the absence of writers.  Additionally,
636	>	* these lookups do not ever block: While the lock is not
637	>	* available, they proceed along the slow traversal path (via
638	>	* next-pointers) until the lock becomes available or the list is
639	>	* exhausted, whichever comes first. (These cases are not fast,
640	>	* but maximize aggregate expected throughput.)  The AQS mechanics
641	>	* for doing this are straightforward.  The lock state is held as
642	>	* AQS getState().  Read counts are negative; the write count (1)
643	>	* is positive.  There are no signalling preferences among readers
644	>	* and writers. Since we don't need to export full Lock API, we
645	>	* just override the minimal AQS methods and use them directly.
646		*/
647	<	private static final void transfer(Node[] tab, Node[] nextTab, Node fwd) {
648	<	int n = tab.length;
649	<	Node ignore = nextTab[n + n - 1]; // force bounds check
650	<	for (int i = n - 1; i >= 0; --i) {
651	<	for (Node e;;) {
652	<	if ((e = tabAt(tab, i)) != null) {
653	<	boolean validated = false;
654	<	synchronized (e) {
655	<	if (tabAt(tab, i) == e) {
656	<	validated = true;
657	<	Node lo = null, hi = null, lastRun = e;
658	<	int runBit = e.hash & n;
659	<	for (Node p = e.next; p != null; p = p.next) {
660	<	int b = p.hash & n;
661	<	if (b != runBit) {
662	<	runBit = b;
663	<	lastRun = p;
647	>	static final class TreeBin extends AbstractQueuedSynchronizer {
648	>	private static final long serialVersionUID = 2249069246763182397L;
649	>	transient TreeNode root;  // root of tree
650	>	transient TreeNode first; // head of next-pointer list
651	>
652	>	/* AQS overrides */
653	>	public final boolean isHeldExclusively() { return getState() > 0; }
654	>	public final boolean tryAcquire(int ignore) {
655	>	if (compareAndSetState(0, 1)) {
656	>	setExclusiveOwnerThread(Thread.currentThread());
657	>	return true;
658	>	}
659	>	return false;
660	>	}
661	>	public final boolean tryRelease(int ignore) {
662	>	setExclusiveOwnerThread(null);
663	>	setState(0);
664	>	return true;
665	>	}
666	>	public final int tryAcquireShared(int ignore) {
667	>	for (int c;;) {
668	>	if ((c = getState()) > 0)
669	>	return -1;
670	>	if (compareAndSetState(c, c -1))
671	>	return 1;
672	>	}
673	>	}
674	>	public final boolean tryReleaseShared(int ignore) {
675	>	int c;
676	>	do {} while (!compareAndSetState(c = getState(), c + 1));
677	>	return c == -1;
678	>	}
679	>
680	>	/** From CLR */
681	>	private void rotateLeft(TreeNode p) {
682	>	if (p != null) {
683	>	TreeNode r = p.right, pp, rl;
684	>	if ((rl = p.right = r.left) != null)
685	>	rl.parent = p;
686	>	if ((pp = r.parent = p.parent) == null)
687	>	root = r;
688	>	else if (pp.left == p)
689	>	pp.left = r;
690	>	else
691	>	pp.right = r;
692	>	r.left = p;
693	>	p.parent = r;
694	>	}
695	>	}
696	>
697	>	/** From CLR */
698	>	private void rotateRight(TreeNode p) {
699	>	if (p != null) {
700	>	TreeNode l = p.left, pp, lr;
701	>	if ((lr = p.left = l.right) != null)
702	>	lr.parent = p;
703	>	if ((pp = l.parent = p.parent) == null)
704	>	root = l;
705	>	else if (pp.right == p)
706	>	pp.right = l;
707	>	else
708	>	pp.left = l;
709	>	l.right = p;
710	>	p.parent = l;
711	>	}
712	>	}
713	>
714	>	/**
715	>	* Returns the TreeNode (or null if not found) for the given key
716	>	* starting at given root.
717	>	*/
718	>	@SuppressWarnings("unchecked") // suppress Comparable cast warning
719	>	final TreeNode getTreeNode(int h, Object k, TreeNode p) {
720	>	Class<?> c = k.getClass();
721	>	while (p != null) {
722	>	int dir, ph;  Object pk; Class<?> pc;
723	>	if ((ph = p.hash) == h) {
724	>	if ((pk = p.key) == k || k.equals(pk))
725	>	return p;
726	>	if (c != (pc = pk.getClass()) ||
727	>	!(k instanceof Comparable) ||
728	>	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
729	>	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
730	>	TreeNode r = null, s = null, pl, pr;
731	>	if (dir >= 0) {
732	>	if ((pl = p.left) != null && h <= pl.hash)
733	>	s = pl;
734	>	}
735	>	else if ((pr = p.right) != null && h >= pr.hash)
736	>	s = pr;
737	>	if (s != null && (r = getTreeNode(h, k, s)) != null)
738	>	return r;
739	>	}
740	>	}
741	>	else
742	>	dir = (h < ph) ? -1 : 1;
743	>	p = (dir > 0) ? p.right : p.left;
744	>	}
745	>	return null;
746	>	}
747	>
748	>	/**
749	>	* Wrapper for getTreeNode used by CHM.get. Tries to obtain
750	>	* read-lock to call getTreeNode, but during failure to get
751	>	* lock, searches along next links.
752	>	*/
753	>	final Object getValue(int h, Object k) {
754	>	Node r = null;
755	>	int c = getState(); // Must read lock state first
756	>	for (Node e = first; e != null; e = e.next) {
757	>	if (c <= 0 && compareAndSetState(c, c - 1)) {
758	>	try {
759	>	r = getTreeNode(h, k, root);
760	>	} finally {
761	>	releaseShared(0);
762	>	}
763	>	break;
764	>	}
765	>	else if ((e.hash & HASH_BITS) == h && k.equals(e.key)) {
766	>	r = e;
767	>	break;
768	>	}
769	>	else
770	>	c = getState();
771	>	}
772	>	return r == null ? null : r.val;
773	>	}
774	>
775	>	/**
776	>	* Finds or adds a node.
777	>	* @return null if added
778	>	*/
779	>	@SuppressWarnings("unchecked") // suppress Comparable cast warning
780	>	final TreeNode putTreeNode(int h, Object k, Object v) {
781	>	Class<?> c = k.getClass();
782	>	TreeNode pp = root, p = null;
783	>	int dir = 0;
784	>	while (pp != null) { // find existing node or leaf to insert at
785	>	int ph;  Object pk; Class<?> pc;
786	>	p = pp;
787	>	if ((ph = p.hash) == h) {
788	>	if ((pk = p.key) == k || k.equals(pk))
789	>	return p;
790	>	if (c != (pc = pk.getClass()) ||
791	>	!(k instanceof Comparable) ||
792	>	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
793	>	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
794	>	TreeNode r = null, s = null, pl, pr;
795	>	if (dir >= 0) {
796	>	if ((pl = p.left) != null && h <= pl.hash)
797	>	s = pl;
798	>	}
799	>	else if ((pr = p.right) != null && h >= pr.hash)
800	>	s = pr;
801	>	if (s != null && (r = getTreeNode(h, k, s)) != null)
802	>	return r;
803	>	}
804	>	}
805	>	else
806	>	dir = (h < ph) ? -1 : 1;
807	>	pp = (dir > 0) ? p.right : p.left;
808	>	}
809	>
810	>	TreeNode f = first;
811	>	TreeNode x = first = new TreeNode(h, k, v, f, p);
812	>	if (p == null)
813	>	root = x;
814	>	else { // attach and rebalance; adapted from CLR
815	>	TreeNode xp, xpp;
816	>	if (f != null)
817	>	f.prev = x;
818	>	if (dir <= 0)
819	>	p.left = x;
820	>	else
821	>	p.right = x;
822	>	x.red = true;
823	>	while (x != null && (xp = x.parent) != null && xp.red &&
824	>	(xpp = xp.parent) != null) {
825	>	TreeNode xppl = xpp.left;
826	>	if (xp == xppl) {
827	>	TreeNode y = xpp.right;
828	>	if (y != null && y.red) {
829	>	y.red = false;
830	>	xp.red = false;
831	>	xpp.red = true;
832	>	x = xpp;
833	>	}
834	>	else {
835	>	if (x == xp.right) {
836	>	rotateLeft(x = xp);
837	>	xpp = (xp = x.parent) == null ? null : xp.parent;
838	>	}
839	>	if (xp != null) {
840	>	xp.red = false;
841	>	if (xpp != null) {
842	>	xpp.red = true;
843	>	rotateRight(xpp);
844		}
845		}
846	<	if (runBit == 0)
847	<	lo = lastRun;
848	<	else
849	<	hi = lastRun;
850	<	for (Node p = e; p != lastRun; p = p.next) {
851	<	int ph = p.hash;
852	<	Object pk = p.key, pv = p.val;
853	<	if ((ph & n) == 0)
854	<	lo = new Node(ph, pk, pv, lo);
855	<	else
856	<	hi = new Node(ph, pk, pv, hi);
846	>	}
847	>	}
848	>	else {
849	>	TreeNode y = xppl;
850	>	if (y != null && y.red) {
851	>	y.red = false;
852	>	xp.red = false;
853	>	xpp.red = true;
854	>	x = xpp;
855	>	}
856	>	else {
857	>	if (x == xp.left) {
858	>	rotateRight(x = xp);
859	>	xpp = (xp = x.parent) == null ? null : xp.parent;
860	>	}
861	>	if (xp != null) {
862	>	xp.red = false;
863	>	if (xpp != null) {
864	>	xpp.red = true;
865	>	rotateLeft(xpp);
866	>	}
867		}
472	–	setTabAt(nextTab, i, lo);
473	–	setTabAt(nextTab, i + n, hi);
474	–	setTabAt(tab, i, fwd);
868		}
869		}
870	<	if (validated)
870	>	}
871	>	TreeNode r = root;
872	>	if (r != null && r.red)
873	>	r.red = false;
874	>	}
875	>	return null;
876	>	}
877	>
878	>	/**
879	>	* Removes the given node, that must be present before this
880	>	* call.  This is messier than typical red-black deletion code
881	>	* because we cannot swap the contents of an interior node
882	>	* with a leaf successor that is pinned by "next" pointers
883	>	* that are accessible independently of lock. So instead we
884	>	* swap the tree linkages.
885	>	*/
886	>	final void deleteTreeNode(TreeNode p) {
887	>	TreeNode next = (TreeNode)p.next; // unlink traversal pointers
888	>	TreeNode pred = p.prev;
889	>	if (pred == null)
890	>	first = next;
891	>	else
892	>	pred.next = next;
893	>	if (next != null)
894	>	next.prev = pred;
895	>	TreeNode replacement;
896	>	TreeNode pl = p.left;
897	>	TreeNode pr = p.right;
898	>	if (pl != null && pr != null) {
899	>	TreeNode s = pr, sl;
900	>	while ((sl = s.left) != null) // find successor
901	>	s = sl;
902	>	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
903	>	TreeNode sr = s.right;
904	>	TreeNode pp = p.parent;
905	>	if (s == pr) { // p was s's direct parent
906	>	p.parent = s;
907	>	s.right = p;
908	>	}
909	>	else {
910	>	TreeNode sp = s.parent;
911	>	if ((p.parent = sp) != null) {
912	>	if (s == sp.left)
913	>	sp.left = p;
914	>	else
915	>	sp.right = p;
916	>	}
917	>	if ((s.right = pr) != null)
918	>	pr.parent = s;
919	>	}
920	>	p.left = null;
921	>	if ((p.right = sr) != null)
922	>	sr.parent = p;
923	>	if ((s.left = pl) != null)
924	>	pl.parent = s;
925	>	if ((s.parent = pp) == null)
926	>	root = s;
927	>	else if (p == pp.left)
928	>	pp.left = s;
929	>	else
930	>	pp.right = s;
931	>	replacement = sr;
932	>	}
933	>	else
934	>	replacement = (pl != null) ? pl : pr;
935	>	TreeNode pp = p.parent;
936	>	if (replacement == null) {
937	>	if (pp == null) {
938	>	root = null;
939	>	return;
940	>	}
941	>	replacement = p;
942	>	}
943	>	else {
944	>	replacement.parent = pp;
945	>	if (pp == null)
946	>	root = replacement;
947	>	else if (p == pp.left)
948	>	pp.left = replacement;
949	>	else
950	>	pp.right = replacement;
951	>	p.left = p.right = p.parent = null;
952	>	}
953	>	if (!p.red) { // rebalance, from CLR
954	>	TreeNode x = replacement;
955	>	while (x != null) {
956	>	TreeNode xp, xpl;
957	>	if (x.red || (xp = x.parent) == null) {
958	>	x.red = false;
959		break;
960	+	}
961	+	if (x == (xpl = xp.left)) {
962	+	TreeNode sib = xp.right;
963	+	if (sib != null && sib.red) {
964	+	sib.red = false;
965	+	xp.red = true;
966	+	rotateLeft(xp);
967	+	sib = (xp = x.parent) == null ? null : xp.right;
968	+	}
969	+	if (sib == null)
970	+	x = xp;
971	+	else {
972	+	TreeNode sl = sib.left, sr = sib.right;
973	+	if ((sr == null || !sr.red) &&
974	+	(sl == null || !sl.red)) {
975	+	sib.red = true;
976	+	x = xp;
977	+	}
978	+	else {
979	+	if (sr == null || !sr.red) {
980	+	if (sl != null)
981	+	sl.red = false;
982	+	sib.red = true;
983	+	rotateRight(sib);
984	+	sib = (xp = x.parent) == null ? null : xp.right;
985	+	}
986	+	if (sib != null) {
987	+	sib.red = (xp == null) ? false : xp.red;
988	+	if ((sr = sib.right) != null)
989	+	sr.red = false;
990	+	}
991	+	if (xp != null) {
992	+	xp.red = false;
993	+	rotateLeft(xp);
994	+	}
995	+	x = root;
996	+	}
997	+	}
998	+	}
999	+	else { // symmetric
1000	+	TreeNode sib = xpl;
1001	+	if (sib != null && sib.red) {
1002	+	sib.red = false;
1003	+	xp.red = true;
1004	+	rotateRight(xp);
1005	+	sib = (xp = x.parent) == null ? null : xp.left;
1006	+	}
1007	+	if (sib == null)
1008	+	x = xp;
1009	+	else {
1010	+	TreeNode sl = sib.left, sr = sib.right;
1011	+	if ((sl == null || !sl.red) &&
1012	+	(sr == null || !sr.red)) {
1013	+	sib.red = true;
1014	+	x = xp;
1015	+	}
1016	+	else {
1017	+	if (sl == null || !sl.red) {
1018	+	if (sr != null)
1019	+	sr.red = false;
1020	+	sib.red = true;
1021	+	rotateLeft(sib);
1022	+	sib = (xp = x.parent) == null ? null : xp.left;
1023	+	}
1024	+	if (sib != null) {
1025	+	sib.red = (xp == null) ? false : xp.red;
1026	+	if ((sl = sib.left) != null)
1027	+	sl.red = false;
1028	+	}
1029	+	if (xp != null) {
1030	+	xp.red = false;
1031	+	rotateRight(xp);
1032	+	}
1033	+	x = root;
1034	+	}
1035	+	}
1036	+	}
1037		}
1038	<	else if (casTabAt(tab, i, e, fwd))
1039	<	break;
1038	>	}
1039	>	if (p == replacement && (pp = p.parent) != null) {
1040	>	if (p == pp.left) // detach pointers
1041	>	pp.left = null;
1042	>	else if (p == pp.right)
1043	>	pp.right = null;
1044	>	p.parent = null;
1045		}
1046		}
1047		}
1048
1049	<	/* ---------------- Internal access and update methods -------------- */
1049	>	/* ---------------- Collision reduction methods -------------- */
1050
1051		/**
1052	<	* Applies a supplemental hash function to a given hashCode, which
1053	<	* defends against poor quality hash functions.  The result must
1054	<	* be non-negative, and for reasonable performance must have good
1055	<	* avalanche properties; i.e., that each bit of the argument
1056	<	* affects each bit (except sign bit) of the result.
1052	>	* Spreads higher bits to lower, and also forces top 2 bits to 0.
1053	>	* Because the table uses power-of-two masking, sets of hashes
1054	>	* that vary only in bits above the current mask will always
1055	>	* collide. (Among known examples are sets of Float keys holding
1056	>	* consecutive whole numbers in small tables.)  To counter this,
1057	>	* we apply a transform that spreads the impact of higher bits
1058	>	* downward. There is a tradeoff between speed, utility, and
1059	>	* quality of bit-spreading. Because many common sets of hashes
1060	>	* are already reasonably distributed across bits (so don't benefit
1061	>	* from spreading), and because we use trees to handle large sets
1062	>	* of collisions in bins, we don't need excessively high quality.
1063		*/
1064		private static final int spread(int h) {
1065	<	// Apply base step of MurmurHash; see http://code.google.com/p/smhasher/
1066	<	h ^= h >>> 16;
1067	<	h *= 0x85ebca6b;
1068	<	h ^= h >>> 13;
1069	<	h *= 0xc2b2ae35;
1070	<	return (h >>> 16) ^ (h & 0x7fffffff); // mask out sign bit
1065	>	h ^= (h >>> 18) ^ (h >>> 12);
1066	>	return (h ^ (h >>> 10)) & HASH_BITS;
1067	>	}
1068	>
1069	>	/**
1070	>	* Replaces a list bin with a tree bin. Call only when locked.
1071	>	* Fails to replace if the given key is non-comparable or table
1072	>	* is, or needs, resizing.
1073	>	*/
1074	>	private final void replaceWithTreeBin(Node[] tab, int index, Object key) {
1075	>	if ((key instanceof Comparable) &&
1076	>	(tab.length >= MAXIMUM_CAPACITY || counter.sum() < (long)sizeCtl)) {
1077	>	TreeBin t = new TreeBin();
1078	>	for (Node e = tabAt(tab, index); e != null; e = e.next)
1079	>	t.putTreeNode(e.hash & HASH_BITS, e.key, e.val);
1080	>	setTabAt(tab, index, new Node(MOVED, t, null, null));
1081	>	}
1082		}
1083
1084	+	/* ---------------- Internal access and update methods -------------- */
1085	+
1086		/** Implementation for get and containsKey */
1087		private final Object internalGet(Object k) {
1088		int h = spread(k.hashCode());
1089		retry: for (Node[] tab = table; tab != null;) {
1090	<	Node e; Object ek, ev; int eh;  // locals to read fields once
1090	>	Node e, p; Object ek, ev; int eh;      // locals to read fields once
1091		for (e = tabAt(tab, (tab.length - 1) & h); e != null; e = e.next) {
1092	<	if ((eh = e.hash) == h) {
1093	<	if ((ev = e.val) != null &&
1094	<	((ek = e.key) == k || k.equals(ek)))
1095	<	return ev;
1096	<	}
1097	<	else if (eh < 0) {          // sign bit set
1098	<	tab = (Node[])e.key;    // bin was moved during resize
517	<	continue retry;
1092	>	if ((eh = e.hash) == MOVED) {
1093	>	if ((ek = e.key) instanceof TreeBin)  // search TreeBin
1094	>	return ((TreeBin)ek).getValue(h, k);
1095	>	else {                        // restart with new table
1096	>	tab = (Node[])ek;
1097	>	continue retry;
1098	>	}
1099		}
1100	+	else if ((eh & HASH_BITS) == h && (ev = e.val) != null &&
1101	+	((ek = e.key) == k || k.equals(ek)))
1102	+	return ev;
1103		}
1104		break;
1105		}
1106		return null;
1107		}
1108
1109	<	/** Implementation for put and putIfAbsent */
1110	<	private final Object internalPut(Object k, Object v, boolean replace) {
1109	>	/**
1110	>	* Implementation for the four public remove/replace methods:
1111	>	* Replaces node value with v, conditional upon match of cv if
1112	>	* non-null.  If resulting value is null, delete.
1113	>	*/
1114	>	private final Object internalReplace(Object k, Object v, Object cv) {
1115		int h = spread(k.hashCode());
1116	<	Object oldVal = null;               // previous value or null if none
1116	>	Object oldVal = null;
1117		for (Node[] tab = table;;) {
1118	<	Node e; int i; Object ek, ev;
1118	>	Node f; int i, fh; Object fk;
1119	>	if (tab == null ||
1120	>	(f = tabAt(tab, i = (tab.length - 1) & h)) == null)
1121	>	break;
1122	>	else if ((fh = f.hash) == MOVED) {
1123	>	if ((fk = f.key) instanceof TreeBin) {
1124	>	TreeBin t = (TreeBin)fk;
1125	>	boolean validated = false;
1126	>	boolean deleted = false;
1127	>	t.acquire(0);
1128	>	try {
1129	>	if (tabAt(tab, i) == f) {
1130	>	validated = true;
1131	>	TreeNode p = t.getTreeNode(h, k, t.root);
1132	>	if (p != null) {
1133	>	Object pv = p.val;
1134	>	if (cv == null || cv == pv || cv.equals(pv)) {
1135	>	oldVal = pv;
1136	>	if ((p.val = v) == null) {
1137	>	deleted = true;
1138	>	t.deleteTreeNode(p);
1139	>	}
1140	>	}
1141	>	}
1142	>	}
1143	>	} finally {
1144	>	t.release(0);
1145	>	}
1146	>	if (validated) {
1147	>	if (deleted)
1148	>	counter.add(-1L);
1149	>	break;
1150	>	}
1151	>	}
1152	>	else
1153	>	tab = (Node[])fk;
1154	>	}
1155	>	else if ((fh & HASH_BITS) != h && f.next == null) // precheck
1156	>	break;                          // rules out possible existence
1157	>	else if ((fh & LOCKED) != 0) {
1158	>	checkForResize();               // try resizing if can't get lock
1159	>	f.tryAwaitLock(tab, i);
1160	>	}
1161	>	else if (f.casHash(fh, fh | LOCKED)) {
1162	>	boolean validated = false;
1163	>	boolean deleted = false;
1164	>	try {
1165	>	if (tabAt(tab, i) == f) {
1166	>	validated = true;
1167	>	for (Node e = f, pred = null;;) {
1168	>	Object ek, ev;
1169	>	if ((e.hash & HASH_BITS) == h &&
1170	>	((ev = e.val) != null) &&
1171	>	((ek = e.key) == k || k.equals(ek))) {
1172	>	if (cv == null || cv == ev || cv.equals(ev)) {
1173	>	oldVal = ev;
1174	>	if ((e.val = v) == null) {
1175	>	deleted = true;
1176	>	Node en = e.next;
1177	>	if (pred != null)
1178	>	pred.next = en;
1179	>	else
1180	>	setTabAt(tab, i, en);
1181	>	}
1182	>	}
1183	>	break;
1184	>	}
1185	>	pred = e;
1186	>	if ((e = e.next) == null)
1187	>	break;
1188	>	}
1189	>	}
1190	>	} finally {
1191	>	if (!f.casHash(fh | LOCKED, fh)) {
1192	>	f.hash = fh;
1193	>	synchronized (f) { f.notifyAll(); };
1194	>	}
1195	>	}
1196	>	if (validated) {
1197	>	if (deleted)
1198	>	counter.add(-1L);
1199	>	break;
1200	>	}
1201	>	}
1202	>	}
1203	>	return oldVal;
1204	>	}
1205	>
1206	>	/*
1207	>	* Internal versions of the five insertion methods, each a
1208	>	* little more complicated than the last. All have
1209	>	* the same basic structure as the first (internalPut):
1210	>	*  1. If table uninitialized, create
1211	>	*  2. If bin empty, try to CAS new node
1212	>	*  3. If bin stale, use new table
1213	>	*  4. if bin converted to TreeBin, validate and relay to TreeBin methods
1214	>	*  5. Lock and validate; if valid, scan and add or update
1215	>	*
1216	>	* The others interweave other checks and/or alternative actions:
1217	>	*  * Plain put checks for and performs resize after insertion.
1218	>	*  * putIfAbsent prescans for mapping without lock (and fails to add
1219	>	*    if present), which also makes pre-emptive resize checks worthwhile.
1220	>	*  * computeIfAbsent extends form used in putIfAbsent with additional
1221	>	*    mechanics to deal with, calls, potential exceptions and null
1222	>	*    returns from function call.
1223	>	*  * compute uses the same function-call mechanics, but without
1224	>	*    the prescans
1225	>	*  * putAll attempts to pre-allocate enough table space
1226	>	*    and more lazily performs count updates and checks.
1227	>	*
1228	>	* Someday when details settle down a bit more, it might be worth
1229	>	* some factoring to reduce sprawl.
1230	>	*/
1231	>
1232	>	/** Implementation for put */
1233	>	private final Object internalPut(Object k, Object v) {
1234	>	int h = spread(k.hashCode());
1235	>	int count = 0;
1236	>	for (Node[] tab = table;;) {
1237	>	int i; Node f; int fh; Object fk;
1238		if (tab == null)
1239	<	tab = growTable();
1240	<	else if ((e = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1239	>	tab = initTable();
1240	>	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1241		if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1242		break;                   // no lock when adding to empty bin
1243		}
1244	<	else if (e.hash < 0)             // resized -- restart with new table
1245	<	tab = (Node[])e.key;
1246	<	else if (!replace && e.hash == h && (ev = e.val) != null &&
1247	<	((ek = e.key) == k || k.equals(ek))) {
1248	<	if (tabAt(tab, i) == e) {    // inspect and validate 1st node
1249	<	oldVal = ev;             // without lock for putIfAbsent
1250	<	break;
1244	>	else if ((fh = f.hash) == MOVED) {
1245	>	if ((fk = f.key) instanceof TreeBin) {
1246	>	TreeBin t = (TreeBin)fk;
1247	>	Object oldVal = null;
1248	>	t.acquire(0);
1249	>	try {
1250	>	if (tabAt(tab, i) == f) {
1251	>	count = 2;
1252	>	TreeNode p = t.putTreeNode(h, k, v);
1253	>	if (p != null) {
1254	>	oldVal = p.val;
1255	>	p.val = v;
1256	>	}
1257	>	}
1258	>	} finally {
1259	>	t.release(0);
1260	>	}
1261	>	if (count != 0) {
1262	>	if (oldVal != null)
1263	>	return oldVal;
1264	>	break;
1265	>	}
1266		}
1267	+	else
1268	+	tab = (Node[])fk;
1269		}
1270	<	else {
1271	<	boolean validated = false;
1272	<	boolean checkSize = false;
1273	<	synchronized (e) {           // lock the 1st node of bin list
1274	<	if (tabAt(tab, i) == e) {
1275	<	validated = true;    // retry if 1st already deleted
1276	<	for (Node first = e;;) {
1277	<	if (e.hash == h &&
1278	<	((ek = e.key) == k || k.equals(ek)) &&
1279	<	(ev = e.val) != null) {
1270	>	else if ((fh & LOCKED) != 0) {
1271	>	checkForResize();
1272	>	f.tryAwaitLock(tab, i);
1273	>	}
1274	>	else if (f.casHash(fh, fh | LOCKED)) {
1275	>	Object oldVal = null;
1276	>	try {                        // needed in case equals() throws
1277	>	if (tabAt(tab, i) == f) {
1278	>	count = 1;
1279	>	for (Node e = f;; ++count) {
1280	>	Object ek, ev;
1281	>	if ((e.hash & HASH_BITS) == h &&
1282	>	(ev = e.val) != null &&
1283	>	((ek = e.key) == k || k.equals(ek))) {
1284		oldVal = ev;
1285	<	if (replace)
558	<	e.val = v;
1285	>	e.val = v;
1286		break;
1287		}
1288		Node last = e;
1289		if ((e = e.next) == null) {
1290		last.next = new Node(h, k, v, null);
1291	<	if (last != first || tab.length <= 64)
1292	<	checkSize = true;
1291	>	if (count >= TREE_THRESHOLD)
1292	>	replaceWithTreeBin(tab, i, k);
1293		break;
1294		}
1295		}
1296		}
1297	+	} finally {                  // unlock and signal if needed
1298	+	if (!f.casHash(fh | LOCKED, fh)) {
1299	+	f.hash = fh;
1300	+	synchronized (f) { f.notifyAll(); };
1301	+	}
1302		}
1303	<	if (validated) {
1304	<	if (checkSize && tab.length < MAXIMUM_CAPACITY &&
1305	<	resizing == 0 && counter.sum() >= (long)threshold)
1306	<	growTable();
1303	>	if (count != 0) {
1304	>	if (oldVal != null)
1305	>	return oldVal;
1306	>	if (tab.length <= 64)
1307	>	count = 2;
1308		break;
1309		}
1310		}
1311		}
1312	<	if (oldVal == null)
1313	<	counter.increment();             // update counter outside of locks
1314	<	return oldVal;
1312	>	counter.add(1L);
1313	>	if (count > 1)
1314	>	checkForResize();
1315	>	return null;
1316		}
1317
1318	<	/**
1319	<	* Implementation for the four public remove/replace methods:
586	<	* Replaces node value with v, conditional upon match of cv if
587	<	* non-null.  If resulting value is null, delete.
588	<	*/
589	<	private final Object internalReplace(Object k, Object v, Object cv) {
1318	>	/** Implementation for putIfAbsent */
1319	>	private final Object internalPutIfAbsent(Object k, Object v) {
1320		int h = spread(k.hashCode());
1321	+	int count = 0;
1322		for (Node[] tab = table;;) {
1323	<	Node e; int i;
1324	<	if (tab == null ||
1325	<	(e = tabAt(tab, i = (tab.length - 1) & h)) == null)
1326	<	return null;
1327	<	else if (e.hash < 0)
1328	<	tab = (Node[])e.key;
1323	>	int i; Node f; int fh; Object fk, fv;
1324	>	if (tab == null)
1325	>	tab = initTable();
1326	>	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1327	>	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1328	>	break;
1329	>	}
1330	>	else if ((fh = f.hash) == MOVED) {
1331	>	if ((fk = f.key) instanceof TreeBin) {
1332	>	TreeBin t = (TreeBin)fk;
1333	>	Object oldVal = null;
1334	>	t.acquire(0);
1335	>	try {
1336	>	if (tabAt(tab, i) == f) {
1337	>	count = 2;
1338	>	TreeNode p = t.putTreeNode(h, k, v);
1339	>	if (p != null)
1340	>	oldVal = p.val;
1341	>	}
1342	>	} finally {
1343	>	t.release(0);
1344	>	}
1345	>	if (count != 0) {
1346	>	if (oldVal != null)
1347	>	return oldVal;
1348	>	break;
1349	>	}
1350	>	}
1351	>	else
1352	>	tab = (Node[])fk;
1353	>	}
1354	>	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1355	>	((fk = f.key) == k || k.equals(fk)))
1356	>	return fv;
1357		else {
1358	<	Object oldVal = null;
1359	<	boolean validated = false;
1360	<	boolean deleted = false;
1361	<	synchronized (e) {
1362	<	if (tabAt(tab, i) == e) {
1363	<	validated = true;
1364	<	Node pred = null;
1365	<	do {
1366	<	Object ek, ev;
1367	<	if (e.hash == h &&
1368	<	((ek = e.key) == k || k.equals(ek)) &&
1369	<	((ev = e.val) != null)) {
1370	<	if (cv == null || cv == ev || cv.equals(ev)) {
1358	>	Node g = f.next;
1359	>	if (g != null) { // at least 2 nodes -- search and maybe resize
1360	>	for (Node e = g;;) {
1361	>	Object ek, ev;
1362	>	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1363	>	((ek = e.key) == k || k.equals(ek)))
1364	>	return ev;
1365	>	if ((e = e.next) == null) {
1366	>	checkForResize();
1367	>	break;
1368	>	}
1369	>	}
1370	>	}
1371	>	if (((fh = f.hash) & LOCKED) != 0) {
1372	>	checkForResize();
1373	>	f.tryAwaitLock(tab, i);
1374	>	}
1375	>	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1376	>	Object oldVal = null;
1377	>	try {
1378	>	if (tabAt(tab, i) == f) {
1379	>	count = 1;
1380	>	for (Node e = f;; ++count) {
1381	>	Object ek, ev;
1382	>	if ((e.hash & HASH_BITS) == h &&
1383	>	(ev = e.val) != null &&
1384	>	((ek = e.key) == k || k.equals(ek))) {
1385		oldVal = ev;
1386	<	if ((e.val = v) == null) {
1387	<	deleted = true;
1388	<	Node en = e.next;
1389	<	if (pred != null)
1390	<	pred.next = en;
1391	<	else
1392	<	setTabAt(tab, i, en);
1393	<	}
1386	>	break;
1387	>	}
1388	>	Node last = e;
1389	>	if ((e = e.next) == null) {
1390	>	last.next = new Node(h, k, v, null);
1391	>	if (count >= TREE_THRESHOLD)
1392	>	replaceWithTreeBin(tab, i, k);
1393	>	break;
1394		}
622	–	break;
1395		}
1396	<	} while ((e = (pred = e).next) != null);
1396	>	}
1397	>	} finally {
1398	>	if (!f.casHash(fh | LOCKED, fh)) {
1399	>	f.hash = fh;
1400	>	synchronized (f) { f.notifyAll(); };
1401	>	}
1402	>	}
1403	>	if (count != 0) {
1404	>	if (oldVal != null)
1405	>	return oldVal;
1406	>	if (tab.length <= 64)
1407	>	count = 2;
1408	>	break;
1409		}
1410		}
1411	<	if (validated) {
1412	<	if (deleted)
1413	<	counter.decrement();
1414	<	return oldVal;
1411	>	}
1412	>	}
1413	>	counter.add(1L);
1414	>	if (count > 1)
1415	>	checkForResize();
1416	>	return null;
1417	>	}
1418	>
1419	>	/** Implementation for computeIfAbsent */
1420	>	private final Object internalComputeIfAbsent(K k,
1421	>	Fun<? super K, ?> mf) {
1422	>	int h = spread(k.hashCode());
1423	>	Object val = null;
1424	>	int count = 0;
1425	>	for (Node[] tab = table;;) {
1426	>	Node f; int i, fh; Object fk, fv;
1427	>	if (tab == null)
1428	>	tab = initTable();
1429	>	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1430	>	Node node = new Node(fh = h | LOCKED, k, null, null);
1431	>	if (casTabAt(tab, i, null, node)) {
1432	>	count = 1;
1433	>	try {
1434	>	if ((val = mf.apply(k)) != null)
1435	>	node.val = val;
1436	>	} finally {
1437	>	if (val == null)
1438	>	setTabAt(tab, i, null);
1439	>	if (!node.casHash(fh, h)) {
1440	>	node.hash = h;
1441	>	synchronized (node) { node.notifyAll(); };
1442	>	}
1443	>	}
1444	>	}
1445	>	if (count != 0)
1446	>	break;
1447	>	}
1448	>	else if ((fh = f.hash) == MOVED) {
1449	>	if ((fk = f.key) instanceof TreeBin) {
1450	>	TreeBin t = (TreeBin)fk;
1451	>	boolean added = false;
1452	>	t.acquire(0);
1453	>	try {
1454	>	if (tabAt(tab, i) == f) {
1455	>	count = 1;
1456	>	TreeNode p = t.getTreeNode(h, k, t.root);
1457	>	if (p != null)
1458	>	val = p.val;
1459	>	else if ((val = mf.apply(k)) != null) {
1460	>	added = true;
1461	>	count = 2;
1462	>	t.putTreeNode(h, k, val);
1463	>	}
1464	>	}
1465	>	} finally {
1466	>	t.release(0);
1467	>	}
1468	>	if (count != 0) {
1469	>	if (!added)
1470	>	return val;
1471	>	break;
1472	>	}
1473		}
1474	+	else
1475	+	tab = (Node[])fk;
1476		}
1477	+	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1478	+	((fk = f.key) == k || k.equals(fk)))
1479	+	return fv;
1480	+	else {
1481	+	Node g = f.next;
1482	+	if (g != null) {
1483	+	for (Node e = g;;) {
1484	+	Object ek, ev;
1485	+	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1486	+	((ek = e.key) == k || k.equals(ek)))
1487	+	return ev;
1488	+	if ((e = e.next) == null) {
1489	+	checkForResize();
1490	+	break;
1491	+	}
1492	+	}
1493	+	}
1494	+	if (((fh = f.hash) & LOCKED) != 0) {
1495	+	checkForResize();
1496	+	f.tryAwaitLock(tab, i);
1497	+	}
1498	+	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1499	+	boolean added = false;
1500	+	try {
1501	+	if (tabAt(tab, i) == f) {
1502	+	count = 1;
1503	+	for (Node e = f;; ++count) {
1504	+	Object ek, ev;
1505	+	if ((e.hash & HASH_BITS) == h &&
1506	+	(ev = e.val) != null &&
1507	+	((ek = e.key) == k || k.equals(ek))) {
1508	+	val = ev;
1509	+	break;
1510	+	}
1511	+	Node last = e;
1512	+	if ((e = e.next) == null) {
1513	+	if ((val = mf.apply(k)) != null) {
1514	+	added = true;
1515	+	last.next = new Node(h, k, val, null);
1516	+	if (count >= TREE_THRESHOLD)
1517	+	replaceWithTreeBin(tab, i, k);
1518	+	}
1519	+	break;
1520	+	}
1521	+	}
1522	+	}
1523	+	} finally {
1524	+	if (!f.casHash(fh | LOCKED, fh)) {
1525	+	f.hash = fh;
1526	+	synchronized (f) { f.notifyAll(); };
1527	+	}
1528	+	}
1529	+	if (count != 0) {
1530	+	if (!added)
1531	+	return val;
1532	+	if (tab.length <= 64)
1533	+	count = 2;
1534	+	break;
1535	+	}
1536	+	}
1537	+	}
1538	+	}
1539	+	if (val != null) {
1540	+	counter.add(1L);
1541	+	if (count > 1)
1542	+	checkForResize();
1543		}
1544	+	return val;
1545		}
1546
1547	<	/** Implementation for computeIfAbsent and compute. Like put, but messier. */
1547	>	/** Implementation for compute */
1548		@SuppressWarnings("unchecked")
1549	<	private final V internalCompute(K k,
1550	<	MappingFunction<? super K, ? extends V> f,
640	<	boolean replace) {
1549	>	private final Object internalCompute(K k, boolean onlyIfPresent,
1550	>	BiFun<? super K, ? super V, ? extends V> mf) {
1551		int h = spread(k.hashCode());
1552	<	V val = null;
1553	<	boolean added = false;
1554	<	Node[] tab = table;
1555	<	outer:for (;;) {
1556	<	Node e; int i; Object ek, ev;
1552	>	Object val = null;
1553	>	int delta = 0;
1554	>	int count = 0;
1555	>	for (Node[] tab = table;;) {
1556	>	Node f; int i, fh; Object fk;
1557		if (tab == null)
1558	<	tab = growTable();
1559	<	else if ((e = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1560	<	Node node = new Node(h, k, null, null);
1561	<	boolean validated = false;
1562	<	synchronized (node) {  // must lock while computing value
1563	<	if (casTabAt(tab, i, null, node)) {
1564	<	validated = true;
1565	<	try {
1566	<	val = f.map(k);
1567	<	if (val != null) {
1568	<	node.val = val;
1569	<	added = true;
1558	>	tab = initTable();
1559	>	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1560	>	if (onlyIfPresent)
1561	>	break;
1562	>	Node node = new Node(fh = h | LOCKED, k, null, null);
1563	>	if (casTabAt(tab, i, null, node)) {
1564	>	try {
1565	>	count = 1;
1566	>	if ((val = mf.apply(k, null)) != null) {
1567	>	node.val = val;
1568	>	delta = 1;
1569	>	}
1570	>	} finally {
1571	>	if (delta == 0)
1572	>	setTabAt(tab, i, null);
1573	>	if (!node.casHash(fh, h)) {
1574	>	node.hash = h;
1575	>	synchronized (node) { node.notifyAll(); };
1576	>	}
1577	>	}
1578	>	}
1579	>	if (count != 0)
1580	>	break;
1581	>	}
1582	>	else if ((fh = f.hash) == MOVED) {
1583	>	if ((fk = f.key) instanceof TreeBin) {
1584	>	TreeBin t = (TreeBin)fk;
1585	>	t.acquire(0);
1586	>	try {
1587	>	if (tabAt(tab, i) == f) {
1588	>	count = 1;
1589	>	TreeNode p = t.getTreeNode(h, k, t.root);
1590	>	Object pv = (p == null) ? null : p.val;
1591	>	if ((val = mf.apply(k, (V)pv)) != null) {
1592	>	if (p != null)
1593	>	p.val = val;
1594	>	else {
1595	>	count = 2;
1596	>	delta = 1;
1597	>	t.putTreeNode(h, k, val);
1598	>	}
1599	>	}
1600	>	else if (p != null) {
1601	>	delta = -1;
1602	>	t.deleteTreeNode(p);
1603		}
661	–	} finally {
662	–	if (!added)
663	–	setTabAt(tab, i, null);
1604		}
1605	+	} finally {
1606	+	t.release(0);
1607		}
1608	+	if (count != 0)
1609	+	break;
1610		}
1611	<	if (validated)
1611	>	else
1612	>	tab = (Node[])fk;
1613	>	}
1614	>	else if ((fh & LOCKED) != 0) {
1615	>	checkForResize();
1616	>	f.tryAwaitLock(tab, i);
1617	>	}
1618	>	else if (f.casHash(fh, fh | LOCKED)) {
1619	>	try {
1620	>	if (tabAt(tab, i) == f) {
1621	>	count = 1;
1622	>	for (Node e = f, pred = null;; ++count) {
1623	>	Object ek, ev;
1624	>	if ((e.hash & HASH_BITS) == h &&
1625	>	(ev = e.val) != null &&
1626	>	((ek = e.key) == k || k.equals(ek))) {
1627	>	val = mf.apply(k, (V)ev);
1628	>	if (val != null)
1629	>	e.val = val;
1630	>	else {
1631	>	delta = -1;
1632	>	Node en = e.next;
1633	>	if (pred != null)
1634	>	pred.next = en;
1635	>	else
1636	>	setTabAt(tab, i, en);
1637	>	}
1638	>	break;
1639	>	}
1640	>	pred = e;
1641	>	if ((e = e.next) == null) {
1642	>	if (!onlyIfPresent && (val = mf.apply(k, null)) != null) {
1643	>	pred.next = new Node(h, k, val, null);
1644	>	delta = 1;
1645	>	if (count >= TREE_THRESHOLD)
1646	>	replaceWithTreeBin(tab, i, k);
1647	>	}
1648	>	break;
1649	>	}
1650	>	}
1651	>	}
1652	>	} finally {
1653	>	if (!f.casHash(fh | LOCKED, fh)) {
1654	>	f.hash = fh;
1655	>	synchronized (f) { f.notifyAll(); };
1656	>	}
1657	>	}
1658	>	if (count != 0) {
1659	>	if (tab.length <= 64)
1660	>	count = 2;
1661		break;
1662	+	}
1663		}
1664	<	else if (e.hash < 0)
1665	<	tab = (Node[])e.key;
1666	<	else if (!replace && e.hash == h && (ev = e.val) != null &&
1667	<	((ek = e.key) == k || k.equals(ek))) {
1668	<	if (tabAt(tab, i) == e) {
1669	<	val = (V)ev;
1664	>	}
1665	>	if (delta != 0) {
1666	>	counter.add((long)delta);
1667	>	if (count > 1)
1668	>	checkForResize();
1669	>	}
1670	>	return val;
1671	>	}
1672	>
1673	>	private final Object internalMerge(K k, V v,
1674	>	BiFun<? super V, ? super V, ? extends V> mf) {
1675	>	int h = spread(k.hashCode());
1676	>	Object val = null;
1677	>	int delta = 0;
1678	>	int count = 0;
1679	>	for (Node[] tab = table;;) {
1680	>	int i; Node f; int fh; Object fk, fv;
1681	>	if (tab == null)
1682	>	tab = initTable();
1683	>	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1684	>	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1685	>	delta = 1;
1686	>	val = v;
1687		break;
1688		}
1689		}
1690	<	else if (Thread.holdsLock(e))
1691	<	throw new IllegalStateException("Recursive map computation");
1692	<	else {
1693	<	boolean validated = false;
1694	<	boolean checkSize = false;
1695	<	synchronized (e) {
1696	<	if (tabAt(tab, i) == e) {
1697	<	validated = true;
1698	<	for (Node first = e;;) {
1699	<	if (e.hash == h &&
1700	<	((ek = e.key) == k || k.equals(ek)) &&
1701	<	((ev = e.val) != null)) {
1702	<	Object fv;
1703	<	if (replace && (fv = f.map(k)) != null)
1704	<	ev = e.val = fv;
1705	<	val = (V)ev;
1690	>	else if ((fh = f.hash) == MOVED) {
1691	>	if ((fk = f.key) instanceof TreeBin) {
1692	>	TreeBin t = (TreeBin)fk;
1693	>	t.acquire(0);
1694	>	try {
1695	>	if (tabAt(tab, i) == f) {
1696	>	count = 1;
1697	>	TreeNode p = t.getTreeNode(h, k, t.root);
1698	>	val = (p == null) ? v : mf.apply((V)p.val, v);
1699	>	if (val != null) {
1700	>	if (p != null)
1701	>	p.val = val;
1702	>	else {
1703	>	count = 2;
1704	>	delta = 1;
1705	>	t.putTreeNode(h, k, val);
1706	>	}
1707	>	}
1708	>	else if (p != null) {
1709	>	delta = -1;
1710	>	t.deleteTreeNode(p);
1711	>	}
1712	>	}
1713	>	} finally {
1714	>	t.release(0);
1715	>	}
1716	>	if (count != 0)
1717	>	break;
1718	>	}
1719	>	else
1720	>	tab = (Node[])fk;
1721	>	}
1722	>	else if ((fh & LOCKED) != 0) {
1723	>	checkForResize();
1724	>	f.tryAwaitLock(tab, i);
1725	>	}
1726	>	else if (f.casHash(fh, fh | LOCKED)) {
1727	>	try {
1728	>	if (tabAt(tab, i) == f) {
1729	>	count = 1;
1730	>	for (Node e = f, pred = null;; ++count) {
1731	>	Object ek, ev;
1732	>	if ((e.hash & HASH_BITS) == h &&
1733	>	(ev = e.val) != null &&
1734	>	((ek = e.key) == k || k.equals(ek))) {
1735	>	val = mf.apply(v, (V)ev);
1736	>	if (val != null)
1737	>	e.val = val;
1738	>	else {
1739	>	delta = -1;
1740	>	Node en = e.next;
1741	>	if (pred != null)
1742	>	pred.next = en;
1743	>	else
1744	>	setTabAt(tab, i, en);
1745	>	}
1746		break;
1747		}
1748	<	Node last = e;
1748	>	pred = e;
1749		if ((e = e.next) == null) {
1750	<	if ((val = f.map(k)) != null) {
1751	<	last.next = new Node(h, k, val, null);
1752	<	added = true;
1753	<	if (last != first || tab.length <= 64)
1754	<	checkSize = true;
704	<	}
1750	>	val = v;
1751	>	pred.next = new Node(h, k, val, null);
1752	>	delta = 1;
1753	>	if (count >= TREE_THRESHOLD)
1754	>	replaceWithTreeBin(tab, i, k);
1755		break;
1756		}
1757		}
1758		}
1759	+	} finally {
1760	+	if (!f.casHash(fh | LOCKED, fh)) {
1761	+	f.hash = fh;
1762	+	synchronized (f) { f.notifyAll(); };
1763	+	}
1764		}
1765	<	if (validated) {
1766	<	if (checkSize && tab.length < MAXIMUM_CAPACITY &&
1767	<	resizing == 0 && counter.sum() >= (long)threshold)
713	<	growTable();
1765	>	if (count != 0) {
1766	>	if (tab.length <= 64)
1767	>	count = 2;
1768		break;
1769		}
1770		}
1771		}
1772	<	if (added)
1773	<	counter.increment();
1772	>	if (delta != 0) {
1773	>	counter.add((long)delta);
1774	>	if (count > 1)
1775	>	checkForResize();
1776	>	}
1777		return val;
1778		}
1779
1780	+	/** Implementation for putAll */
1781	+	private final void internalPutAll(Map<?, ?> m) {
1782	+	tryPresize(m.size());
1783	+	long delta = 0L;     // number of uncommitted additions
1784	+	boolean npe = false; // to throw exception on exit for nulls
1785	+	try {                // to clean up counts on other exceptions
1786	+	for (Map.Entry<?, ?> entry : m.entrySet()) {
1787	+	Object k, v;
1788	+	if (entry == null || (k = entry.getKey()) == null ||
1789	+	(v = entry.getValue()) == null) {
1790	+	npe = true;
1791	+	break;
1792	+	}
1793	+	int h = spread(k.hashCode());
1794	+	for (Node[] tab = table;;) {
1795	+	int i; Node f; int fh; Object fk;
1796	+	if (tab == null)
1797	+	tab = initTable();
1798	+	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null){
1799	+	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1800	+	++delta;
1801	+	break;
1802	+	}
1803	+	}
1804	+	else if ((fh = f.hash) == MOVED) {
1805	+	if ((fk = f.key) instanceof TreeBin) {
1806	+	TreeBin t = (TreeBin)fk;
1807	+	boolean validated = false;
1808	+	t.acquire(0);
1809	+	try {
1810	+	if (tabAt(tab, i) == f) {
1811	+	validated = true;
1812	+	TreeNode p = t.getTreeNode(h, k, t.root);
1813	+	if (p != null)
1814	+	p.val = v;
1815	+	else {
1816	+	t.putTreeNode(h, k, v);
1817	+	++delta;
1818	+	}
1819	+	}
1820	+	} finally {
1821	+	t.release(0);
1822	+	}
1823	+	if (validated)
1824	+	break;
1825	+	}
1826	+	else
1827	+	tab = (Node[])fk;
1828	+	}
1829	+	else if ((fh & LOCKED) != 0) {
1830	+	counter.add(delta);
1831	+	delta = 0L;
1832	+	checkForResize();
1833	+	f.tryAwaitLock(tab, i);
1834	+	}
1835	+	else if (f.casHash(fh, fh | LOCKED)) {
1836	+	int count = 0;
1837	+	try {
1838	+	if (tabAt(tab, i) == f) {
1839	+	count = 1;
1840	+	for (Node e = f;; ++count) {
1841	+	Object ek, ev;
1842	+	if ((e.hash & HASH_BITS) == h &&
1843	+	(ev = e.val) != null &&
1844	+	((ek = e.key) == k || k.equals(ek))) {
1845	+	e.val = v;
1846	+	break;
1847	+	}
1848	+	Node last = e;
1849	+	if ((e = e.next) == null) {
1850	+	++delta;
1851	+	last.next = new Node(h, k, v, null);
1852	+	if (count >= TREE_THRESHOLD)
1853	+	replaceWithTreeBin(tab, i, k);
1854	+	break;
1855	+	}
1856	+	}
1857	+	}
1858	+	} finally {
1859	+	if (!f.casHash(fh | LOCKED, fh)) {
1860	+	f.hash = fh;
1861	+	synchronized (f) { f.notifyAll(); };
1862	+	}
1863	+	}
1864	+	if (count != 0) {
1865	+	if (count > 1) {
1866	+	counter.add(delta);
1867	+	delta = 0L;
1868	+	checkForResize();
1869	+	}
1870	+	break;
1871	+	}
1872	+	}
1873	+	}
1874	+	}
1875	+	} finally {
1876	+	if (delta != 0)
1877	+	counter.add(delta);
1878	+	}
1879	+	if (npe)
1880	+	throw new NullPointerException();
1881	+	}
1882	+
1883	+	/* ---------------- Table Initialization and Resizing -------------- */
1884	+
1885		/**
1886	<	* Implementation for clear. Steps through each bin, removing all nodes.
1886	>	* Returns a power of two table size for the given desired capacity.
1887	>	* See Hackers Delight, sec 3.2
1888	>	*/
1889	>	private static final int tableSizeFor(int c) {
1890	>	int n = c - 1;
1891	>	n |= n >>> 1;
1892	>	n |= n >>> 2;
1893	>	n |= n >>> 4;
1894	>	n |= n >>> 8;
1895	>	n |= n >>> 16;
1896	>	return (n < 0) ? 1 : (n >= MAXIMUM_CAPACITY) ? MAXIMUM_CAPACITY : n + 1;
1897	>	}
1898	>
1899	>	/**
1900	>	* Initializes table, using the size recorded in sizeCtl.
1901	>	*/
1902	>	private final Node[] initTable() {
1903	>	Node[] tab; int sc;
1904	>	while ((tab = table) == null) {
1905	>	if ((sc = sizeCtl) < 0)
1906	>	Thread.yield(); // lost initialization race; just spin
1907	>	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1908	>	try {
1909	>	if ((tab = table) == null) {
1910	>	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
1911	>	tab = table = new Node[n];
1912	>	sc = n - (n >>> 2);
1913	>	}
1914	>	} finally {
1915	>	sizeCtl = sc;
1916	>	}
1917	>	break;
1918	>	}
1919	>	}
1920	>	return tab;
1921	>	}
1922	>
1923	>	/**
1924	>	* If table is too small and not already resizing, creates next
1925	>	* table and transfers bins.  Rechecks occupancy after a transfer
1926	>	* to see if another resize is already needed because resizings
1927	>	* are lagging additions.
1928	>	*/
1929	>	private final void checkForResize() {
1930	>	Node[] tab; int n, sc;
1931	>	while ((tab = table) != null &&
1932	>	(n = tab.length) < MAXIMUM_CAPACITY &&
1933	>	(sc = sizeCtl) >= 0 && counter.sum() >= (long)sc &&
1934	>	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1935	>	try {
1936	>	if (tab == table) {
1937	>	table = rebuild(tab);
1938	>	sc = (n << 1) - (n >>> 1);
1939	>	}
1940	>	} finally {
1941	>	sizeCtl = sc;
1942	>	}
1943	>	}
1944	>	}
1945	>
1946	>	/**
1947	>	* Tries to presize table to accommodate the given number of elements.
1948	>	*
1949	>	* @param size number of elements (doesn't need to be perfectly accurate)
1950	>	*/
1951	>	private final void tryPresize(int size) {
1952	>	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
1953	>	tableSizeFor(size + (size >>> 1) + 1);
1954	>	int sc;
1955	>	while ((sc = sizeCtl) >= 0) {
1956	>	Node[] tab = table; int n;
1957	>	if (tab == null || (n = tab.length) == 0) {
1958	>	n = (sc > c) ? sc : c;
1959	>	if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1960	>	try {
1961	>	if (table == tab) {
1962	>	table = new Node[n];
1963	>	sc = n - (n >>> 2);
1964	>	}
1965	>	} finally {
1966	>	sizeCtl = sc;
1967	>	}
1968	>	}
1969	>	}
1970	>	else if (c <= sc || n >= MAXIMUM_CAPACITY)
1971	>	break;
1972	>	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1973	>	try {
1974	>	if (table == tab) {
1975	>	table = rebuild(tab);
1976	>	sc = (n << 1) - (n >>> 1);
1977	>	}
1978	>	} finally {
1979	>	sizeCtl = sc;
1980	>	}
1981	>	}
1982	>	}
1983	>	}
1984	>
1985	>	/*
1986	>	* Moves and/or copies the nodes in each bin to new table. See
1987	>	* above for explanation.
1988	>	*
1989	>	* @return the new table
1990	>	*/
1991	>	private static final Node[] rebuild(Node[] tab) {
1992	>	int n = tab.length;
1993	>	Node[] nextTab = new Node[n << 1];
1994	>	Node fwd = new Node(MOVED, nextTab, null, null);
1995	>	int[] buffer = null;       // holds bins to revisit; null until needed
1996	>	Node rev = null;           // reverse forwarder; null until needed
1997	>	int nbuffered = 0;         // the number of bins in buffer list
1998	>	int bufferIndex = 0;       // buffer index of current buffered bin
1999	>	int bin = n - 1;           // current non-buffered bin or -1 if none
2000	>
2001	>	for (int i = bin;;) {      // start upwards sweep
2002	>	int fh; Node f;
2003	>	if ((f = tabAt(tab, i)) == null) {
2004	>	if (bin >= 0) {    // no lock needed (or available)
2005	>	if (!casTabAt(tab, i, f, fwd))
2006	>	continue;
2007	>	}
2008	>	else {             // transiently use a locked forwarding node
2009	>	Node g = new Node(MOVED|LOCKED, nextTab, null, null);
2010	>	if (!casTabAt(tab, i, f, g))
2011	>	continue;
2012	>	setTabAt(nextTab, i, null);
2013	>	setTabAt(nextTab, i + n, null);
2014	>	setTabAt(tab, i, fwd);
2015	>	if (!g.casHash(MOVED|LOCKED, MOVED)) {
2016	>	g.hash = MOVED;
2017	>	synchronized (g) { g.notifyAll(); }
2018	>	}
2019	>	}
2020	>	}
2021	>	else if ((fh = f.hash) == MOVED) {
2022	>	Object fk = f.key;
2023	>	if (fk instanceof TreeBin) {
2024	>	TreeBin t = (TreeBin)fk;
2025	>	boolean validated = false;
2026	>	t.acquire(0);
2027	>	try {
2028	>	if (tabAt(tab, i) == f) {
2029	>	validated = true;
2030	>	splitTreeBin(nextTab, i, t);
2031	>	setTabAt(tab, i, fwd);
2032	>	}
2033	>	} finally {
2034	>	t.release(0);
2035	>	}
2036	>	if (!validated)
2037	>	continue;
2038	>	}
2039	>	}
2040	>	else if ((fh & LOCKED) == 0 && f.casHash(fh, fh|LOCKED)) {
2041	>	boolean validated = false;
2042	>	try {              // split to lo and hi lists; copying as needed
2043	>	if (tabAt(tab, i) == f) {
2044	>	validated = true;
2045	>	splitBin(nextTab, i, f);
2046	>	setTabAt(tab, i, fwd);
2047	>	}
2048	>	} finally {
2049	>	if (!f.casHash(fh | LOCKED, fh)) {
2050	>	f.hash = fh;
2051	>	synchronized (f) { f.notifyAll(); };
2052	>	}
2053	>	}
2054	>	if (!validated)
2055	>	continue;
2056	>	}
2057	>	else {
2058	>	if (buffer == null) // initialize buffer for revisits
2059	>	buffer = new int[TRANSFER_BUFFER_SIZE];
2060	>	if (bin < 0 && bufferIndex > 0) {
2061	>	int j = buffer[--bufferIndex];
2062	>	buffer[bufferIndex] = i;
2063	>	i = j;         // swap with another bin
2064	>	continue;
2065	>	}
2066	>	if (bin < 0 || nbuffered >= TRANSFER_BUFFER_SIZE) {
2067	>	f.tryAwaitLock(tab, i);
2068	>	continue;      // no other options -- block
2069	>	}
2070	>	if (rev == null)   // initialize reverse-forwarder
2071	>	rev = new Node(MOVED, tab, null, null);
2072	>	if (tabAt(tab, i) != f || (f.hash & LOCKED) == 0)
2073	>	continue;      // recheck before adding to list
2074	>	buffer[nbuffered++] = i;
2075	>	setTabAt(nextTab, i, rev);     // install place-holders
2076	>	setTabAt(nextTab, i + n, rev);
2077	>	}
2078	>
2079	>	if (bin > 0)
2080	>	i = --bin;
2081	>	else if (buffer != null && nbuffered > 0) {
2082	>	bin = -1;
2083	>	i = buffer[bufferIndex = --nbuffered];
2084	>	}
2085	>	else
2086	>	return nextTab;
2087	>	}
2088	>	}
2089	>
2090	>	/**
2091	>	* Splits a normal bin with list headed by e into lo and hi parts;
2092	>	* installs in given table.
2093	>	*/
2094	>	private static void splitBin(Node[] nextTab, int i, Node e) {
2095	>	int bit = nextTab.length >>> 1; // bit to split on
2096	>	int runBit = e.hash & bit;
2097	>	Node lastRun = e, lo = null, hi = null;
2098	>	for (Node p = e.next; p != null; p = p.next) {
2099	>	int b = p.hash & bit;
2100	>	if (b != runBit) {
2101	>	runBit = b;
2102	>	lastRun = p;
2103	>	}
2104	>	}
2105	>	if (runBit == 0)
2106	>	lo = lastRun;
2107	>	else
2108	>	hi = lastRun;
2109	>	for (Node p = e; p != lastRun; p = p.next) {
2110	>	int ph = p.hash & HASH_BITS;
2111	>	Object pk = p.key, pv = p.val;
2112	>	if ((ph & bit) == 0)
2113	>	lo = new Node(ph, pk, pv, lo);
2114	>	else
2115	>	hi = new Node(ph, pk, pv, hi);
2116	>	}
2117	>	setTabAt(nextTab, i, lo);
2118	>	setTabAt(nextTab, i + bit, hi);
2119	>	}
2120	>
2121	>	/**
2122	>	* Splits a tree bin into lo and hi parts; installs in given table.
2123	>	*/
2124	>	private static void splitTreeBin(Node[] nextTab, int i, TreeBin t) {
2125	>	int bit = nextTab.length >>> 1;
2126	>	TreeBin lt = new TreeBin();
2127	>	TreeBin ht = new TreeBin();
2128	>	int lc = 0, hc = 0;
2129	>	for (Node e = t.first; e != null; e = e.next) {
2130	>	int h = e.hash & HASH_BITS;
2131	>	Object k = e.key, v = e.val;
2132	>	if ((h & bit) == 0) {
2133	>	++lc;
2134	>	lt.putTreeNode(h, k, v);
2135	>	}
2136	>	else {
2137	>	++hc;
2138	>	ht.putTreeNode(h, k, v);
2139	>	}
2140	>	}
2141	>	Node ln, hn; // throw away trees if too small
2142	>	if (lc <= (TREE_THRESHOLD >>> 1)) {
2143	>	ln = null;
2144	>	for (Node p = lt.first; p != null; p = p.next)
2145	>	ln = new Node(p.hash, p.key, p.val, ln);
2146	>	}
2147	>	else
2148	>	ln = new Node(MOVED, lt, null, null);
2149	>	setTabAt(nextTab, i, ln);
2150	>	if (hc <= (TREE_THRESHOLD >>> 1)) {
2151	>	hn = null;
2152	>	for (Node p = ht.first; p != null; p = p.next)
2153	>	hn = new Node(p.hash, p.key, p.val, hn);
2154	>	}
2155	>	else
2156	>	hn = new Node(MOVED, ht, null, null);
2157	>	setTabAt(nextTab, i + bit, hn);
2158	>	}
2159	>
2160	>	/**
2161	>	* Implementation for clear. Steps through each bin, removing all
2162	>	* nodes.
2163		*/
2164		private final void internalClear() {
2165		long delta = 0L; // negative number of deletions
2166		int i = 0;
2167		Node[] tab = table;
2168		while (tab != null && i < tab.length) {
2169	<	Node e = tabAt(tab, i);
2170	<	if (e == null)
2169	>	int fh; Object fk;
2170	>	Node f = tabAt(tab, i);
2171	>	if (f == null)
2172		++i;
2173	<	else if (e.hash < 0)
2174	<	tab = (Node[])e.key;
2175	<	else {
2176	<	boolean validated = false;
2177	<	synchronized (e) {
2178	<	if (tabAt(tab, i) == e) {
2179	<	validated = true;
2180	<	Node en;
742	<	do {
743	<	en = e.next;
744	<	if (e.val != null) { // currently always true
745	<	e.val = null;
2173	>	else if ((fh = f.hash) == MOVED) {
2174	>	if ((fk = f.key) instanceof TreeBin) {
2175	>	TreeBin t = (TreeBin)fk;
2176	>	t.acquire(0);
2177	>	try {
2178	>	if (tabAt(tab, i) == f) {
2179	>	for (Node p = t.first; p != null; p = p.next) {
2180	>	p.val = null;
2181		--delta;
2182		}
2183	<	} while ((e = en) != null);
2183	>	t.first = null;
2184	>	t.root = null;
2185	>	++i;
2186	>	}
2187	>	} finally {
2188	>	t.release(0);
2189	>	}
2190	>	}
2191	>	else
2192	>	tab = (Node[])fk;
2193	>	}
2194	>	else if ((fh & LOCKED) != 0) {
2195	>	counter.add(delta); // opportunistically update count
2196	>	delta = 0L;
2197	>	f.tryAwaitLock(tab, i);
2198	>	}
2199	>	else if (f.casHash(fh, fh | LOCKED)) {
2200	>	try {
2201	>	if (tabAt(tab, i) == f) {
2202	>	for (Node e = f; e != null; e = e.next) {
2203	>	e.val = null;
2204	>	--delta;
2205	>	}
2206		setTabAt(tab, i, null);
2207	+	++i;
2208	+	}
2209	+	} finally {
2210	+	if (!f.casHash(fh | LOCKED, fh)) {
2211	+	f.hash = fh;
2212	+	synchronized (f) { f.notifyAll(); };
2213		}
2214		}
752	–	if (validated)
753	–	++i;
2215		}
2216		}
2217	<	counter.add(delta);
2217	>	if (delta != 0)
2218	>	counter.add(delta);
2219		}
2220
2221		/* ----------------Table Traversal -------------- */
#	Line 764 | Line 2226 | public class ConcurrentHashMapV8<K, V>
2226		*
2227		* At each step, the iterator snapshots the key ("nextKey") and
2228		* value ("nextVal") of a valid node (i.e., one that, at point of
2229	<	* snapshot, has a nonnull user value). Because val fields can
2229	>	* snapshot, has a non-null user value). Because val fields can
2230		* change (including to null, indicating deletion), field nextVal
2231		* might not be accurate at point of use, but still maintains the
2232		* weak consistency property of holding a value that was once
2233		* valid.
2234		*
2235		* Internal traversals directly access these fields, as in:
2236	<	* {@code while (it.next != null) { process(nextKey); it.advance(); }}
2236	>	* {@code while (it.advance() != null) { process(it.nextKey); }}
2237		*
2238	<	* Exported iterators (subclasses of ViewIterator) extract key,
2239	<	* value, or key-value pairs as return values of Iterator.next(),
2240	<	* and encapsulate the it.next check as hasNext();
2241	<	*
2242	<	* The iterator visits each valid node that was reachable upon
2243	<	* iterator construction once. It might miss some that were added
2244	<	* to a bin after the bin was visited, which is OK wrt consistency
2245	<	* guarantees. Maintaining this property in the face of possible
2246	<	* ongoing resizes requires a fair amount of bookkeeping state
2247	<	* that is difficult to optimize away amidst volatile accesses.
2248	<	* Even so, traversal maintains reasonable throughput.
2238	>	* Exported iterators must track whether the iterator has advanced
2239	>	* (in hasNext vs next) (by setting/checking/nulling field
2240	>	* nextVal), and then extract key, value, or key-value pairs as
2241	>	* return values of next().
2242	>	*
2243	>	* The iterator visits once each still-valid node that was
2244	>	* reachable upon iterator construction. It might miss some that
2245	>	* were added to a bin after the bin was visited, which is OK wrt
2246	>	* consistency guarantees. Maintaining this property in the face
2247	>	* of possible ongoing resizes requires a fair amount of
2248	>	* bookkeeping state that is difficult to optimize away amidst
2249	>	* volatile accesses.  Even so, traversal maintains reasonable
2250	>	* throughput.
2251		*
2252		* Normally, iteration proceeds bin-by-bin traversing lists.
2253		* However, if the table has been resized, then all future steps
#	Line 793 | Line 2257 | public class ConcurrentHashMapV8<K, V>
2257		* across threads, iteration terminates if a bounds checks fails
2258		* for a table read.
2259		*
2260	<	* The range-based constructor enables creation of parallel
2261	<	* range-splitting traversals. (Not yet implemented.)
2260	>	* This class extends ForkJoinTask to streamline parallel
2261	>	* iteration in bulk operations (see BulkTask). This adds only an
2262	>	* int of space overhead, which is close enough to negligible in
2263	>	* cases where it is not needed to not worry about it.
2264		*/
2265	<	static class InternalIterator {
2265	>	static class Traverser<K,V,R> extends ForkJoinTask<R> {
2266	>	final ConcurrentHashMapV8<K, V> map;
2267		Node next;           // the next entry to use
2268		Node last;           // the last entry used
2269		Object nextKey;      // cached key field of next
#	Line 804 | Line 2271 | public class ConcurrentHashMapV8<K, V>
2271		Node[] tab;          // current table; updated if resized
2272		int index;           // index of bin to use next
2273		int baseIndex;       // current index of initial table
2274	<	final int baseLimit; // index bound for initial table
2274	>	int baseLimit;       // index bound for initial table
2275		final int baseSize;  // initial table size
2276
2277		/** Creates iterator for all entries in the table. */
2278	<	InternalIterator(Node[] tab) {
2279	<	this.tab = tab;
2278	>	Traverser(ConcurrentHashMapV8<K, V> map) {
2279	>	this.tab = (this.map = map).table;
2280		baseLimit = baseSize = (tab == null) ? 0 : tab.length;
814	–	index = baseIndex = 0;
815	–	next = null;
816	–	advance();
817	–	}
818	–
819	–	/** Creates iterator for the given range of the table */
820	–	InternalIterator(Node[] tab, int lo, int hi) {
821	–	this.tab = tab;
822	–	baseSize = (tab == null) ? 0 : tab.length;
823	–	baseLimit = (hi <= baseSize) ? hi : baseSize;
824	–	index = baseIndex = lo;
825	–	next = null;
826	–	advance();
2281		}
2282
2283	<	/** Advances next. See above for explanation. */
2284	<	final void advance() {
2283	>	/** Creates iterator for split() methods */
2284	>	Traverser(Traverser<K,V,?> it, boolean split) {
2285	>	this.map = it.map;
2286	>	this.tab = it.tab;
2287	>	this.baseSize = it.baseSize;
2288	>	int lo = it.baseIndex;
2289	>	int hi = this.baseLimit = it.baseLimit;
2290	>	int i;
2291	>	if (split) // adjust parent
2292	>	i = it.baseLimit = (lo + hi + 1) >>> 1;
2293	>	else       // clone parent
2294	>	i = lo;
2295	>	this.index = this.baseIndex = i;
2296	>	}
2297	>
2298	>	/**
2299	>	* Advances next; returns nextVal or null if terminated.
2300	>	* See above for explanation.
2301	>	*/
2302	>	final Object advance() {
2303		Node e = last = next;
2304	+	Object ev = null;
2305		outer: do {
2306	<	if (e != null)                   // pass used or skipped node
2306	>	if (e != null)                  // advance past used/skipped node
2307		e = e.next;
2308	<	while (e == null) {              // get to next non-null bin
2309	<	Node[] t; int b, i, n;       // checks must use locals
2308	>	while (e == null) {             // get to next non-null bin
2309	>	Node[] t; int b, i, n; Object ek; // checks must use locals
2310		if ((b = baseIndex) >= baseLimit || (i = index) < 0 ||
2311		(t = tab) == null || i >= (n = t.length))
2312		break outer;
2313	<	else if ((e = tabAt(t, i)) != null && e.hash < 0)
2314	<	tab = (Node[])e.key;     // restarts due to null val
2315	<	else                         // visit upper slots if present
2316	<	index = (i += baseSize) < n ? i : (baseIndex = b + 1);
2313	>	else if ((e = tabAt(t, i)) != null && e.hash == MOVED) {
2314	>	if ((ek = e.key) instanceof TreeBin)
2315	>	e = ((TreeBin)ek).first;
2316	>	else {
2317	>	tab = (Node[])ek;
2318	>	continue;           // restarts due to null val
2319	>	}
2320	>	}                           // visit upper slots if present
2321	>	index = (i += baseSize) < n ? i : (baseIndex = b + 1);
2322		}
2323		nextKey = e.key;
2324	<	} while ((nextVal = e.val) == null); // skip deleted or special nodes
2324	>	} while ((ev = e.val) == null);    // skip deleted or special nodes
2325		next = e;
2326	+	return nextVal = ev;
2327		}
2328	+
2329	+	public final void remove() {
2330	+	if (nextVal == null && last == null)
2331	+	advance();
2332	+	Node e = last;
2333	+	if (e == null)
2334	+	throw new IllegalStateException();
2335	+	last = null;
2336	+	map.remove(e.key);
2337	+	}
2338	+
2339	+	public final boolean hasNext() {
2340	+	return nextVal != null || advance() != null;
2341	+	}
2342	+
2343	+	public final boolean hasMoreElements() { return hasNext(); }
2344	+	public final void setRawResult(Object x) { }
2345	+	public R getRawResult() { return null; }
2346	+	public boolean exec() { return true; }
2347		}
2348
2349		/* ---------------- Public operations -------------- */
2350
2351		/**
2352	<	* Creates a new, empty map with the default initial table size (16),
2352	>	* Creates a new, empty map with the default initial table size (16).
2353		*/
2354		public ConcurrentHashMapV8() {
2355		this.counter = new LongAdder();
858	–	this.targetCapacity = DEFAULT_CAPACITY;
2356		}
2357
2358		/**
#	Line 875 | Line 2372 | public class ConcurrentHashMapV8<K, V>
2372		MAXIMUM_CAPACITY :
2373		tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2374		this.counter = new LongAdder();
2375	<	this.targetCapacity = cap;
2375	>	this.sizeCtl = cap;
2376		}
2377
2378		/**
#	Line 885 | Line 2382 | public class ConcurrentHashMapV8<K, V>
2382		*/
2383		public ConcurrentHashMapV8(Map<? extends K, ? extends V> m) {
2384		this.counter = new LongAdder();
2385	<	this.targetCapacity = DEFAULT_CAPACITY;
2386	<	putAll(m);
2385	>	this.sizeCtl = DEFAULT_CAPACITY;
2386	>	internalPutAll(m);
2387		}
2388
2389		/**
#	Line 933 | Line 2430 | public class ConcurrentHashMapV8<K, V>
2430		if (initialCapacity < concurrencyLevel)   // Use at least as many bins
2431		initialCapacity = concurrencyLevel;   // as estimated threads
2432		long size = (long)(1.0 + (long)initialCapacity / loadFactor);
2433	<	int cap =  ((size >= (long)MAXIMUM_CAPACITY) ?
2434	<	MAXIMUM_CAPACITY: tableSizeFor((int)size));
2433	>	int cap = (size >= (long)MAXIMUM_CAPACITY) ?
2434	>	MAXIMUM_CAPACITY : tableSizeFor((int)size);
2435		this.counter = new LongAdder();
2436	<	this.targetCapacity = cap;
2436	>	this.sizeCtl = cap;
2437		}
2438
2439		/**
#	Line 957 | Line 2454 | public class ConcurrentHashMapV8<K, V>
2454		}
2455
2456		/**
2457	+	* Returns the number of mappings. This method should be used
2458	+	* instead of {@link #size} because a ConcurrentHashMap may
2459	+	* contain more mappings than can be represented as an int. The
2460	+	* value returned is a snapshot; the actual count may differ if
2461	+	* there are ongoing concurrent insertions of removals.
2462	+	*
2463	+	* @return the number of mappings
2464	+	*/
2465	+	public long mappingCount() {
2466	+	long n = counter.sum();
2467	+	return (n < 0L) ? 0L : n;
2468	+	}
2469	+
2470	+	/**
2471		* Returns the value to which the specified key is mapped,
2472		* or {@code null} if this map contains no mapping for the key.
2473		*
#	Line 968 | Line 2479 | public class ConcurrentHashMapV8<K, V>
2479		* @throws NullPointerException if the specified key is null
2480		*/
2481		@SuppressWarnings("unchecked")
2482	<	public V get(Object key) {
2482	>	public V get(Object key) {
2483		if (key == null)
2484		throw new NullPointerException();
2485		return (V)internalGet(key);
#	Line 1003 | Line 2514 | public class ConcurrentHashMapV8<K, V>
2514		if (value == null)
2515		throw new NullPointerException();
2516		Object v;
2517	<	InternalIterator it = new InternalIterator(table);
2518	<	while (it.next != null) {
2519	<	if ((v = it.nextVal) == value || value.equals(v))
2517	>	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2518	>	while ((v = it.advance()) != null) {
2519	>	if (v == value || value.equals(v))
2520		return true;
1010	–	it.advance();
2521		}
2522		return false;
2523		}
#	Line 1045 | Line 2555 | public class ConcurrentHashMapV8<K, V>
2555		* @throws NullPointerException if the specified key or value is null
2556		*/
2557		@SuppressWarnings("unchecked")
2558	<	public V put(K key, V value) {
2558	>	public V put(K key, V value) {
2559		if (key == null || value == null)
2560		throw new NullPointerException();
2561	<	return (V)internalPut(key, value, true);
2561	>	return (V)internalPut(key, value);
2562		}
2563
2564		/**
#	Line 1059 | Line 2569 | public class ConcurrentHashMapV8<K, V>
2569		* @throws NullPointerException if the specified key or value is null
2570		*/
2571		@SuppressWarnings("unchecked")
2572	<	public V putIfAbsent(K key, V value) {
2572	>	public V putIfAbsent(K key, V value) {
2573		if (key == null || value == null)
2574		throw new NullPointerException();
2575	<	return (V)internalPut(key, value, false);
2575	>	return (V)internalPutIfAbsent(key, value);
2576		}
2577
2578		/**
#	Line 1073 | Line 2583 | public class ConcurrentHashMapV8<K, V>
2583		* @param m mappings to be stored in this map
2584		*/
2585		public void putAll(Map<? extends K, ? extends V> m) {
2586	<	if (m == null)
1077	<	throw new NullPointerException();
1078	<	/*
1079	<	* If uninitialized, try to adjust targetCapacity to
1080	<	* accommodate the given number of elements.
1081	<	*/
1082	<	if (table == null) {
1083	<	int size = m.size();
1084	<	int cap = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
1085	<	tableSizeFor(size + (size >>> 1) + 1);
1086	<	if (cap > targetCapacity)
1087	<	targetCapacity = cap;
1088	<	}
1089	<	for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
1090	<	put(e.getKey(), e.getValue());
2586	>	internalPutAll(m);
2587		}
2588
2589		/**
2590		* If the specified key is not already associated with a value,
2591	<	* computes its value using the given mappingFunction, and if
2592	<	* non-null, enters it into the map.  This is equivalent to
2593	<	*  <pre> {@code
2591	>	* computes its value using the given mappingFunction and enters
2592	>	* it into the map unless null.  This is equivalent to
2593	>	* <pre> {@code
2594		* if (map.containsKey(key))
2595		*   return map.get(key);
2596	<	* value = mappingFunction.map(key);
2596	>	* value = mappingFunction.apply(key);
2597		* if (value != null)
2598		*   map.put(key, value);
2599		* return value;}</pre>
2600		*
2601	<	* except that the action is performed atomically.  Some attempted
2602	<	* update operations on this map by other threads may be blocked
2603	<	* while computation is in progress, so the computation should be
2604	<	* short and simple, and must not attempt to update any other
2605	<	* mappings of this Map. The most appropriate usage is to
2601	>	* except that the action is performed atomically.  If the
2602	>	* function returns {@code null} no mapping is recorded. If the
2603	>	* function itself throws an (unchecked) exception, the exception
2604	>	* is rethrown to its caller, and no mapping is recorded.  Some
2605	>	* attempted update operations on this map by other threads may be
2606	>	* blocked while computation is in progress, so the computation
2607	>	* should be short and simple, and must not attempt to update any
2608	>	* other mappings of this Map. The most appropriate usage is to
2609		* construct a new object serving as an initial mapped value, or
2610		* memoized result, as in:
2611	+	*
2612		*  <pre> {@code
2613	<	* map.computeIfAbsent(key, new MappingFunction<K, V>() {
2613	>	* map.computeIfAbsent(key, new Fun<K, V>() {
2614		*   public V map(K k) { return new Value(f(k)); }});}</pre>
2615		*
2616		* @param key key with which the specified value is to be associated
2617		* @param mappingFunction the function to compute a value
2618		* @return the current (existing or computed) value associated with
2619	<	*         the specified key, or {@code null} if the computation
1120	<	*         returned {@code null}
2619	>	*         the specified key, or null if the computed value is null.
2620		* @throws NullPointerException if the specified key or mappingFunction
2621		*         is null
2622		* @throws IllegalStateException if the computation detectably
#	Line 1126 | Line 2625 | public class ConcurrentHashMapV8<K, V>
2625		* @throws RuntimeException or Error if the mappingFunction does so,
2626		*         in which case the mapping is left unestablished
2627		*/
2628	<	public V computeIfAbsent(K key, MappingFunction<? super K, ? extends V> mappingFunction) {
2628	>	@SuppressWarnings("unchecked")
2629	>	public V computeIfAbsent(K key, Fun<? super K, ? extends V> mappingFunction) {
2630		if (key == null || mappingFunction == null)
2631		throw new NullPointerException();
2632	<	return internalCompute(key, mappingFunction, false);
2632	>	return (V)internalComputeIfAbsent(key, mappingFunction);
2633		}
2634
2635		/**
2636	<	* Computes the value associated with the given key using the given
2637	<	* mappingFunction, and if non-null, enters it into the map.  This
1138	<	* is equivalent to
2636	>	* If the given key is present, computes a new mapping value given a key and
2637	>	* its current mapped value. This is equivalent to
2638		*  <pre> {@code
2639	<	* value = mappingFunction.map(key);
2640	<	* if (value != null)
2641	<	*   map.put(key, value);
2642	<	* else
2643	<	*   value = map.get(key);
2644	<	* return value;}</pre>
2639	>	*   if (map.containsKey(key)) {
2640	>	*     value = remappingFunction.apply(key, map.get(key));
2641	>	*     if (value != null)
2642	>	*       map.put(key, value);
2643	>	*     else
2644	>	*       map.remove(key);
2645	>	*   }
2646	>	* }</pre>
2647	>	*
2648	>	* except that the action is performed atomically.  If the
2649	>	* function returns {@code null}, the mapping is removed.  If the
2650	>	* function itself throws an (unchecked) exception, the exception
2651	>	* is rethrown to its caller, and the current mapping is left
2652	>	* unchanged.  Some attempted update operations on this map by
2653	>	* other threads may be blocked while computation is in progress,
2654	>	* so the computation should be short and simple, and must not
2655	>	* attempt to update any other mappings of this Map. For example,
2656	>	* to either create or append new messages to a value mapping:
2657		*
2658	<	* except that the action is performed atomically.  Some attempted
2659	<	* update operations on this map by other threads may be blocked
2660	<	* while computation is in progress, so the computation should be
2661	<	* short and simple, and must not attempt to update any other
2662	<	* mappings of this Map.
2658	>	* @param key key with which the specified value is to be associated
2659	>	* @param remappingFunction the function to compute a value
2660	>	* @return the new value associated with the specified key, or null if none
2661	>	* @throws NullPointerException if the specified key or remappingFunction
2662	>	*         is null
2663	>	* @throws IllegalStateException if the computation detectably
2664	>	*         attempts a recursive update to this map that would
2665	>	*         otherwise never complete
2666	>	* @throws RuntimeException or Error if the remappingFunction does so,
2667	>	*         in which case the mapping is unchanged
2668	>	*/
2669	>	public V computeIfPresent(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
2670	>	if (key == null || remappingFunction == null)
2671	>	throw new NullPointerException();
2672	>	return (V)internalCompute(key, true, remappingFunction);
2673	>	}
2674	>
2675	>	/**
2676	>	* Computes a new mapping value given a key and
2677	>	* its current mapped value (or {@code null} if there is no current
2678	>	* mapping). This is equivalent to
2679	>	*  <pre> {@code
2680	>	*   value = remappingFunction.apply(key, map.get(key));
2681	>	*   if (value != null)
2682	>	*     map.put(key, value);
2683	>	*   else
2684	>	*     map.remove(key);
2685	>	* }</pre>
2686	>	*
2687	>	* except that the action is performed atomically.  If the
2688	>	* function returns {@code null}, the mapping is removed.  If the
2689	>	* function itself throws an (unchecked) exception, the exception
2690	>	* is rethrown to its caller, and the current mapping is left
2691	>	* unchanged.  Some attempted update operations on this map by
2692	>	* other threads may be blocked while computation is in progress,
2693	>	* so the computation should be short and simple, and must not
2694	>	* attempt to update any other mappings of this Map. For example,
2695	>	* to either create or append new messages to a value mapping:
2696	>	*
2697	>	* <pre> {@code
2698	>	* Map<Key, String> map = ...;
2699	>	* final String msg = ...;
2700	>	* map.compute(key, new BiFun<Key, String, String>() {
2701	>	*   public String apply(Key k, String v) {
2702	>	*    return (v == null) ? msg : v + msg;});}}</pre>
2703		*
2704		* @param key key with which the specified value is to be associated
2705	<	* @param mappingFunction the function to compute a value
2706	<	* @return the current value associated with
2707	<	*         the specified key, or {@code null} if the computation
1157	<	*         returned {@code null} and the value was not otherwise present
1158	<	* @throws NullPointerException if the specified key or mappingFunction
2705	>	* @param remappingFunction the function to compute a value
2706	>	* @return the new value associated with the specified key, or null if none
2707	>	* @throws NullPointerException if the specified key or remappingFunction
2708		*         is null
2709		* @throws IllegalStateException if the computation detectably
2710		*         attempts a recursive update to this map that would
2711		*         otherwise never complete
2712	<	* @throws RuntimeException or Error if the mappingFunction does so,
2712	>	* @throws RuntimeException or Error if the remappingFunction does so,
2713		*         in which case the mapping is unchanged
2714		*/
2715	<	public V compute(K key, MappingFunction<? super K, ? extends V> mappingFunction) {
2716	<	if (key == null || mappingFunction == null)
2715	>	//    @SuppressWarnings("unchecked")
2716	>	public V compute(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
2717	>	if (key == null || remappingFunction == null)
2718	>	throw new NullPointerException();
2719	>	return (V)internalCompute(key, false, remappingFunction);
2720	>	}
2721	>
2722	>	/**
2723	>	* If the specified key is not already associated
2724	>	* with a value, associate it with the given value.
2725	>	* Otherwise, replace the value with the results of
2726	>	* the given remapping function. This is equivalent to:
2727	>	*  <pre> {@code
2728	>	*   if (!map.containsKey(key))
2729	>	*     map.put(value);
2730	>	*   else {
2731	>	*     newValue = remappingFunction.apply(map.get(key), value);
2732	>	*     if (value != null)
2733	>	*       map.put(key, value);
2734	>	*     else
2735	>	*       map.remove(key);
2736	>	*   }
2737	>	* }</pre>
2738	>	* except that the action is performed atomically.  If the
2739	>	* function returns {@code null}, the mapping is removed.  If the
2740	>	* function itself throws an (unchecked) exception, the exception
2741	>	* is rethrown to its caller, and the current mapping is left
2742	>	* unchanged.  Some attempted update operations on this map by
2743	>	* other threads may be blocked while computation is in progress,
2744	>	* so the computation should be short and simple, and must not
2745	>	* attempt to update any other mappings of this Map.
2746	>	*/
2747	>	//    @SuppressWarnings("unchecked")
2748	>	public V merge(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
2749	>	if (key == null || value == null || remappingFunction == null)
2750		throw new NullPointerException();
2751	<	return internalCompute(key, mappingFunction, true);
2751	>	return (V)internalMerge(key, value, remappingFunction);
2752		}
2753
2754		/**
#	Line 1179 | Line 2761 | public class ConcurrentHashMapV8<K, V>
2761		* @throws NullPointerException if the specified key is null
2762		*/
2763		@SuppressWarnings("unchecked")
2764	<	public V remove(Object key) {
2764	>	public V remove(Object key) {
2765		if (key == null)
2766		throw new NullPointerException();
2767		return (V)internalReplace(key, null, null);
#	Line 1217 | Line 2799 | public class ConcurrentHashMapV8<K, V>
2799		* @throws NullPointerException if the specified key or value is null
2800		*/
2801		@SuppressWarnings("unchecked")
2802	<	public V replace(K key, V value) {
2802	>	public V replace(K key, V value) {
2803		if (key == null || value == null)
2804		throw new NullPointerException();
2805		return (V)internalReplace(key, value, null);
#	Line 1314 | Line 2896 | public class ConcurrentHashMapV8<K, V>
2896		}
2897
2898		/**
2899	+	* Returns a partitionable iterator of the keys in this map.
2900	+	*
2901	+	* @return a partitionable iterator of the keys in this map
2902	+	*/
2903	+	public Spliterator<K> keySpliterator() {
2904	+	return new KeyIterator<K,V>(this);
2905	+	}
2906	+
2907	+	/**
2908	+	* Returns a partitionable iterator of the values in this map.
2909	+	*
2910	+	* @return a partitionable iterator of the values in this map
2911	+	*/
2912	+	public Spliterator<V> valueSpliterator() {
2913	+	return new ValueIterator<K,V>(this);
2914	+	}
2915	+
2916	+	/**
2917	+	* Returns a partitionable iterator of the entries in this map.
2918	+	*
2919	+	* @return a partitionable iterator of the entries in this map
2920	+	*/
2921	+	public Spliterator<Map.Entry<K,V>> entrySpliterator() {
2922	+	return new EntryIterator<K,V>(this);
2923	+	}
2924	+
2925	+	/**
2926		* Returns the hash code value for this {@link Map}, i.e.,
2927		* the sum of, for each key-value pair in the map,
2928		* {@code key.hashCode() ^ value.hashCode()}.
#	Line 1322 | Line 2931 | public class ConcurrentHashMapV8<K, V>
2931		*/
2932		public int hashCode() {
2933		int h = 0;
2934	<	InternalIterator it = new InternalIterator(table);
2935	<	while (it.next != null) {
2936	<	h += it.nextKey.hashCode() ^ it.nextVal.hashCode();
2937	<	it.advance();
2934	>	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2935	>	Object v;
2936	>	while ((v = it.advance()) != null) {
2937	>	h += it.nextKey.hashCode() ^ v.hashCode();
2938		}
2939		return h;
2940		}
#	Line 1342 | Line 2951 | public class ConcurrentHashMapV8<K, V>
2951		* @return a string representation of this map
2952		*/
2953		public String toString() {
2954	<	InternalIterator it = new InternalIterator(table);
2954	>	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2955		StringBuilder sb = new StringBuilder();
2956		sb.append('{');
2957	<	if (it.next != null) {
2957	>	Object v;
2958	>	if ((v = it.advance()) != null) {
2959		for (;;) {
2960	<	Object k = it.nextKey, v = it.nextVal;
2960	>	Object k = it.nextKey;
2961		sb.append(k == this ? "(this Map)" : k);
2962		sb.append('=');
2963		sb.append(v == this ? "(this Map)" : v);
2964	<	it.advance();
1355	<	if (it.next == null)
2964	>	if ((v = it.advance()) == null)
2965		break;
2966		sb.append(',').append(' ');
2967		}
#	Line 1375 | Line 2984 | public class ConcurrentHashMapV8<K, V>
2984		if (!(o instanceof Map))
2985		return false;
2986		Map<?,?> m = (Map<?,?>) o;
2987	<	InternalIterator it = new InternalIterator(table);
2988	<	while (it.next != null) {
2989	<	Object val = it.nextVal;
2987	>	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2988	>	Object val;
2989	>	while ((val = it.advance()) != null) {
2990		Object v = m.get(it.nextKey);
2991		if (v == null || (v != val && !v.equals(val)))
2992		return false;
1384	–	it.advance();
2993		}
2994		for (Map.Entry<?,?> e : m.entrySet()) {
2995		Object mk, mv, v;
#	Line 1397 | Line 3005 | public class ConcurrentHashMapV8<K, V>
3005
3006		/* ----------------Iterators -------------- */
3007
3008	<	/**
3009	<	* Base class for key, value, and entry iterators.  Adds a map
3010	<	* reference to InternalIterator to support Iterator.remove.
3011	<	*/
3012	<	static abstract class ViewIterator<K,V> extends InternalIterator {
1405	<	final ConcurrentHashMapV8<K, V> map;
1406	<	ViewIterator(ConcurrentHashMapV8<K, V> map) {
1407	<	super(map.table);
1408	<	this.map = map;
3008	>	static final class KeyIterator<K,V> extends Traverser<K,V,Object>
3009	>	implements Spliterator<K>, Enumeration<K> {
3010	>	KeyIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3011	>	KeyIterator(Traverser<K,V,Object> it, boolean split) {
3012	>	super(it, split);
3013		}
3014	<
3015	<	public final void remove() {
1412	<	if (last == null)
3014	>	public KeyIterator<K,V> split() {
3015	>	if (last != null || (next != null && nextVal == null))
3016		throw new IllegalStateException();
3017	<	map.remove(last.key);
1415	<	last = null;
3017	>	return new KeyIterator<K,V>(this, true);
3018		}
1417	–
1418	–	public final boolean hasNext()         { return next != null; }
1419	–	public final boolean hasMoreElements() { return next != null; }
1420	–	}
1421	–
1422	–	static final class KeyIterator<K,V> extends ViewIterator<K,V>
1423	–	implements Iterator<K>, Enumeration<K> {
1424	–	KeyIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
1425	–
3019		@SuppressWarnings("unchecked")
3020	<	public final K next() {
3021	<	if (next == null)
3020	>	public final K next() {
3021	>	if (nextVal == null && advance() == null)
3022		throw new NoSuchElementException();
3023		Object k = nextKey;
3024	<	advance();
3025	<	return (K)k;
3024	>	nextVal = null;
3025	>	return (K) k;
3026		}
3027
3028		public final K nextElement() { return next(); }
3029		}
3030
3031	<	static final class ValueIterator<K,V> extends ViewIterator<K,V>
3032	<	implements Iterator<V>, Enumeration<V> {
3031	>	static final class ValueIterator<K,V> extends Traverser<K,V,Object>
3032	>	implements Spliterator<V>, Enumeration<V> {
3033		ValueIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3034	+	ValueIterator(Traverser<K,V,Object> it, boolean split) {
3035	+	super(it, split);
3036	+	}
3037	+	public ValueIterator<K,V> split() {
3038	+	if (last != null || (next != null && nextVal == null))
3039	+	throw new IllegalStateException();
3040	+	return new ValueIterator<K,V>(this, true);
3041	+	}
3042
3043		@SuppressWarnings("unchecked")
3044	<	public final V next() {
3045	<	if (next == null)
3044	>	public final V next() {
3045	>	Object v;
3046	>	if ((v = nextVal) == null && (v = advance()) == null)
3047		throw new NoSuchElementException();
3048	<	Object v = nextVal;
3049	<	advance();
1448	<	return (V)v;
3048	>	nextVal = null;
3049	>	return (V) v;
3050		}
3051
3052		public final V nextElement() { return next(); }
3053		}
3054
3055	<	static final class EntryIterator<K,V> extends ViewIterator<K,V>
3056	<	implements Iterator<Map.Entry<K,V>> {
3055	>	static final class EntryIterator<K,V> extends Traverser<K,V,Object>
3056	>	implements Spliterator<Map.Entry<K,V>> {
3057		EntryIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3058	+	EntryIterator(Traverser<K,V,Object> it, boolean split) {
3059	+	super(it, split);
3060	+	}
3061	+	public EntryIterator<K,V> split() {
3062	+	if (last != null || (next != null && nextVal == null))
3063	+	throw new IllegalStateException();
3064	+	return new EntryIterator<K,V>(this, true);
3065	+	}
3066
3067		@SuppressWarnings("unchecked")
3068	<	public final Map.Entry<K,V> next() {
3069	<	if (next == null)
3068	>	public final Map.Entry<K,V> next() {
3069	>	Object v;
3070	>	if ((v = nextVal) == null && (v = advance()) == null)
3071		throw new NoSuchElementException();
3072		Object k = nextKey;
3073	<	Object v = nextVal;
3074	<	advance();
1465	<	return new WriteThroughEntry<K,V>(map, (K)k, (V)v);
3073	>	nextVal = null;
3074	>	return new MapEntry<K,V>((K)k, (V)v, map);
3075		}
3076		}
3077
3078		/**
3079	<	* Custom Entry class used by EntryIterator.next(), that relays
1471	<	* setValue changes to the underlying map.
3079	>	* Exported Entry for iterators
3080		*/
3081	<	static final class WriteThroughEntry<K,V> implements Map.Entry<K, V> {
1474	<	final ConcurrentHashMapV8<K, V> map;
3081	>	static final class MapEntry<K,V> implements Map.Entry<K, V> {
3082		final K key; // non-null
3083		V val;       // non-null
3084	<	WriteThroughEntry(ConcurrentHashMapV8<K, V> map, K key, V val) {
3085	<	this.map = map; this.key = key; this.val = val;
3084	>	final ConcurrentHashMapV8<K, V> map;
3085	>	MapEntry(K key, V val, ConcurrentHashMapV8<K, V> map) {
3086	>	this.key = key;
3087	>	this.val = val;
3088	>	this.map = map;
3089		}
1480	–
3090		public final K getKey()       { return key; }
3091		public final V getValue()     { return val; }
3092		public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
#	Line 1494 | Line 3103 | public class ConcurrentHashMapV8<K, V>
3103
3104		/**
3105		* Sets our entry's value and writes through to the map. The
3106	<	* value to return is somewhat arbitrary here. Since a
3107	<	* WriteThroughEntry does not necessarily track asynchronous
3108	<	* changes, the most recent "previous" value could be
3109	<	* different from what we return (or could even have been
3110	<	* removed in which case the put will re-establish). We do not
1502	<	* and cannot guarantee more.
3106	>	* value to return is somewhat arbitrary here. Since we do not
3107	>	* necessarily track asynchronous changes, the most recent
3108	>	* "previous" value could be different from what we return (or
3109	>	* could even have been removed in which case the put will
3110	>	* re-establish). We do not and cannot guarantee more.
3111		*/
3112		public final V setValue(V value) {
3113		if (value == null) throw new NullPointerException();
#	Line 1512 | Line 3120 | public class ConcurrentHashMapV8<K, V>
3120
3121		/* ----------------Views -------------- */
3122
3123	<	/*
3124	<	* These currently just extend java.util.AbstractX classes, but
1517	<	* may need a new custom base to support partitioned traversal.
3123	>	/**
3124	>	* Base class for views.
3125		*/
3126	<
1520	<	static final class KeySet<K,V> extends AbstractSet<K> {
3126	>	static abstract class CHMView<K, V> {
3127		final ConcurrentHashMapV8<K, V> map;
3128	<	KeySet(ConcurrentHashMapV8<K, V> map)   { this.map = map; }
1523	<
3128	>	CHMView(ConcurrentHashMapV8<K, V> map)  { this.map = map; }
3129		public final int size()                 { return map.size(); }
3130		public final boolean isEmpty()          { return map.isEmpty(); }
3131		public final void clear()               { map.clear(); }
3132	+
3133	+	// implementations below rely on concrete classes supplying these
3134	+	abstract public Iterator<?> iterator();
3135	+	abstract public boolean contains(Object o);
3136	+	abstract public boolean remove(Object o);
3137	+
3138	+	private static final String oomeMsg = "Required array size too large";
3139	+
3140	+	public final Object[] toArray() {
3141	+	long sz = map.mappingCount();
3142	+	if (sz > (long)(MAX_ARRAY_SIZE))
3143	+	throw new OutOfMemoryError(oomeMsg);
3144	+	int n = (int)sz;
3145	+	Object[] r = new Object[n];
3146	+	int i = 0;
3147	+	Iterator<?> it = iterator();
3148	+	while (it.hasNext()) {
3149	+	if (i == n) {
3150	+	if (n >= MAX_ARRAY_SIZE)
3151	+	throw new OutOfMemoryError(oomeMsg);
3152	+	if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
3153	+	n = MAX_ARRAY_SIZE;
3154	+	else
3155	+	n += (n >>> 1) + 1;
3156	+	r = Arrays.copyOf(r, n);
3157	+	}
3158	+	r[i++] = it.next();
3159	+	}
3160	+	return (i == n) ? r : Arrays.copyOf(r, i);
3161	+	}
3162	+
3163	+	@SuppressWarnings("unchecked")
3164	+	public final <T> T[] toArray(T[] a) {
3165	+	long sz = map.mappingCount();
3166	+	if (sz > (long)(MAX_ARRAY_SIZE))
3167	+	throw new OutOfMemoryError(oomeMsg);
3168	+	int m = (int)sz;
3169	+	T[] r = (a.length >= m) ? a :
3170	+	(T[])java.lang.reflect.Array
3171	+	.newInstance(a.getClass().getComponentType(), m);
3172	+	int n = r.length;
3173	+	int i = 0;
3174	+	Iterator<?> it = iterator();
3175	+	while (it.hasNext()) {
3176	+	if (i == n) {
3177	+	if (n >= MAX_ARRAY_SIZE)
3178	+	throw new OutOfMemoryError(oomeMsg);
3179	+	if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
3180	+	n = MAX_ARRAY_SIZE;
3181	+	else
3182	+	n += (n >>> 1) + 1;
3183	+	r = Arrays.copyOf(r, n);
3184	+	}
3185	+	r[i++] = (T)it.next();
3186	+	}
3187	+	if (a == r && i < n) {
3188	+	r[i] = null; // null-terminate
3189	+	return r;
3190	+	}
3191	+	return (i == n) ? r : Arrays.copyOf(r, i);
3192	+	}
3193	+
3194	+	public final int hashCode() {
3195	+	int h = 0;
3196	+	for (Iterator<?> it = iterator(); it.hasNext();)
3197	+	h += it.next().hashCode();
3198	+	return h;
3199	+	}
3200	+
3201	+	public final String toString() {
3202	+	StringBuilder sb = new StringBuilder();
3203	+	sb.append('[');
3204	+	Iterator<?> it = iterator();
3205	+	if (it.hasNext()) {
3206	+	for (;;) {
3207	+	Object e = it.next();
3208	+	sb.append(e == this ? "(this Collection)" : e);
3209	+	if (!it.hasNext())
3210	+	break;
3211	+	sb.append(',').append(' ');
3212	+	}
3213	+	}
3214	+	return sb.append(']').toString();
3215	+	}
3216	+
3217	+	public final boolean containsAll(Collection<?> c) {
3218	+	if (c != this) {
3219	+	for (Iterator<?> it = c.iterator(); it.hasNext();) {
3220	+	Object e = it.next();
3221	+	if (e == null || !contains(e))
3222	+	return false;
3223	+	}
3224	+	}
3225	+	return true;
3226	+	}
3227	+
3228	+	public final boolean removeAll(Collection<?> c) {
3229	+	boolean modified = false;
3230	+	for (Iterator<?> it = iterator(); it.hasNext();) {
3231	+	if (c.contains(it.next())) {
3232	+	it.remove();
3233	+	modified = true;
3234	+	}
3235	+	}
3236	+	return modified;
3237	+	}
3238	+
3239	+	public final boolean retainAll(Collection<?> c) {
3240	+	boolean modified = false;
3241	+	for (Iterator<?> it = iterator(); it.hasNext();) {
3242	+	if (!c.contains(it.next())) {
3243	+	it.remove();
3244	+	modified = true;
3245	+	}
3246	+	}
3247	+	return modified;
3248	+	}
3249	+
3250	+	}
3251	+
3252	+	static final class KeySet<K,V> extends CHMView<K,V> implements Set<K> {
3253	+	KeySet(ConcurrentHashMapV8<K, V> map)  {
3254	+	super(map);
3255	+	}
3256		public final boolean contains(Object o) { return map.containsKey(o); }
3257		public final boolean remove(Object o)   { return map.remove(o) != null; }
3258		public final Iterator<K> iterator() {
3259		return new KeyIterator<K,V>(map);
3260		}
3261	+	public final boolean add(K e) {
3262	+	throw new UnsupportedOperationException();
3263	+	}
3264	+	public final boolean addAll(Collection<? extends K> c) {
3265	+	throw new UnsupportedOperationException();
3266	+	}
3267	+	public boolean equals(Object o) {
3268	+	Set<?> c;
3269	+	return ((o instanceof Set) &&
3270	+	((c = (Set<?>)o) == this ||
3271	+	(containsAll(c) && c.containsAll(this))));
3272	+	}
3273		}
3274
1534	–	static final class Values<K,V> extends AbstractCollection<V> {
1535	–	final ConcurrentHashMapV8<K, V> map;
1536	–	Values(ConcurrentHashMapV8<K, V> map)   { this.map = map; }
3275
3276	<	public final int size()                 { return map.size(); }
3277	<	public final boolean isEmpty()          { return map.isEmpty(); }
3278	<	public final void clear()               { map.clear(); }
3276	>	static final class Values<K,V> extends CHMView<K,V>
3277	>	implements Collection<V> {
3278	>	Values(ConcurrentHashMapV8<K, V> map)   { super(map); }
3279		public final boolean contains(Object o) { return map.containsValue(o); }
3280	+	public final boolean remove(Object o) {
3281	+	if (o != null) {
3282	+	Iterator<V> it = new ValueIterator<K,V>(map);
3283	+	while (it.hasNext()) {
3284	+	if (o.equals(it.next())) {
3285	+	it.remove();
3286	+	return true;
3287	+	}
3288	+	}
3289	+	}
3290	+	return false;
3291	+	}
3292		public final Iterator<V> iterator() {
3293		return new ValueIterator<K,V>(map);
3294		}
3295	<	}
3296	<
1547	<	static final class EntrySet<K,V> extends AbstractSet<Map.Entry<K,V>> {
1548	<	final ConcurrentHashMapV8<K, V> map;
1549	<	EntrySet(ConcurrentHashMapV8<K, V> map) { this.map = map; }
1550	<
1551	<	public final int size()                 { return map.size(); }
1552	<	public final boolean isEmpty()          { return map.isEmpty(); }
1553	<	public final void clear()               { map.clear(); }
1554	<	public final Iterator<Map.Entry<K,V>> iterator() {
1555	<	return new EntryIterator<K,V>(map);
3295	>	public final boolean add(V e) {
3296	>	throw new UnsupportedOperationException();
3297		}
3298	+	public final boolean addAll(Collection<? extends V> c) {
3299	+	throw new UnsupportedOperationException();
3300	+	}
3301	+
3302	+	}
3303
3304	+	static final class EntrySet<K,V> extends CHMView<K,V>
3305	+	implements Set<Map.Entry<K,V>> {
3306	+	EntrySet(ConcurrentHashMapV8<K, V> map) { super(map); }
3307		public final boolean contains(Object o) {
3308		Object k, v, r; Map.Entry<?,?> e;
3309		return ((o instanceof Map.Entry) &&
#	Line 1563 | Line 3312 | public class ConcurrentHashMapV8<K, V>
3312		(v = e.getValue()) != null &&
3313		(v == r || v.equals(r)));
3314		}
1566	–
3315		public final boolean remove(Object o) {
3316		Object k, v; Map.Entry<?,?> e;
3317		return ((o instanceof Map.Entry) &&
#	Line 1571 | Line 3319 | public class ConcurrentHashMapV8<K, V>
3319		(v = e.getValue()) != null &&
3320		map.remove(k, v));
3321		}
3322	+	public final Iterator<Map.Entry<K,V>> iterator() {
3323	+	return new EntryIterator<K,V>(map);
3324	+	}
3325	+	public final boolean add(Entry<K,V> e) {
3326	+	throw new UnsupportedOperationException();
3327	+	}
3328	+	public final boolean addAll(Collection<? extends Entry<K,V>> c) {
3329	+	throw new UnsupportedOperationException();
3330	+	}
3331	+	public boolean equals(Object o) {
3332	+	Set<?> c;
3333	+	return ((o instanceof Set) &&
3334	+	((c = (Set<?>)o) == this ||
3335	+	(containsAll(c) && c.containsAll(this))));
3336	+	}
3337		}
3338
3339		/* ---------------- Serialization Support -------------- */
#	Line 1595 | Line 3358 | public class ConcurrentHashMapV8<K, V>
3358		* The key-value mappings are emitted in no particular order.
3359		*/
3360		@SuppressWarnings("unchecked")
3361	<	private void writeObject(java.io.ObjectOutputStream s)
3362	<	throws java.io.IOException {
3361	>	private void writeObject(java.io.ObjectOutputStream s)
3362	>	throws java.io.IOException {
3363		if (segments == null) { // for serialization compatibility
3364		segments = (Segment<K,V>[])
3365		new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
#	Line 1604 | Line 3367 | public class ConcurrentHashMapV8<K, V>
3367		segments[i] = new Segment<K,V>(LOAD_FACTOR);
3368		}
3369		s.defaultWriteObject();
3370	<	InternalIterator it = new InternalIterator(table);
3371	<	while (it.next != null) {
3370	>	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3371	>	Object v;
3372	>	while ((v = it.advance()) != null) {
3373		s.writeObject(it.nextKey);
3374	<	s.writeObject(it.nextVal);
1611	<	it.advance();
3374	>	s.writeObject(v);
3375		}
3376		s.writeObject(null);
3377		s.writeObject(null);
#	Line 1620 | Line 3383 | public class ConcurrentHashMapV8<K, V>
3383		* @param s the stream
3384		*/
3385		@SuppressWarnings("unchecked")
3386	<	private void readObject(java.io.ObjectInputStream s)
3387	<	throws java.io.IOException, ClassNotFoundException {
3386	>	private void readObject(java.io.ObjectInputStream s)
3387	>	throws java.io.IOException, ClassNotFoundException {
3388		s.defaultReadObject();
3389		this.segments = null; // unneeded
3390		// initialize transient final field
3391		UNSAFE.putObjectVolatile(this, counterOffset, new LongAdder());
1629	–	this.targetCapacity = DEFAULT_CAPACITY;
3392
3393		// Create all nodes, then place in table once size is known
3394		long size = 0L;
#	Line 1635 | Line 3397 | public class ConcurrentHashMapV8<K, V>
3397		K k = (K) s.readObject();
3398		V v = (V) s.readObject();
3399		if (k != null && v != null) {
3400	<	p = new Node(spread(k.hashCode()), k, v, p);
3400	>	int h = spread(k.hashCode());
3401	>	p = new Node(h, k, v, p);
3402		++size;
3403		}
3404		else
#	Line 1643 | Line 3406 | public class ConcurrentHashMapV8<K, V>
3406		}
3407		if (p != null) {
3408		boolean init = false;
3409	<	if (resizing == 0 &&
3410	<	UNSAFE.compareAndSwapInt(this, resizingOffset, 0, 1)) {
3409	>	int n;
3410	>	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
3411	>	n = MAXIMUM_CAPACITY;
3412	>	else {
3413	>	int sz = (int)size;
3414	>	n = tableSizeFor(sz + (sz >>> 1) + 1);
3415	>	}
3416	>	int sc = sizeCtl;
3417	>	boolean collide = false;
3418	>	if (n > sc &&
3419	>	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
3420		try {
3421		if (table == null) {
3422		init = true;
1651	–	int n;
1652	–	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
1653	–	n = MAXIMUM_CAPACITY;
1654	–	else {
1655	–	int sz = (int)size;
1656	–	n = tableSizeFor(sz + (sz >>> 1) + 1);
1657	–	}
1658	–	threshold = n - (n >>> 2) - THRESHOLD_OFFSET;
3423		Node[] tab = new Node[n];
3424		int mask = n - 1;
3425		while (p != null) {
3426		int j = p.hash & mask;
3427		Node next = p.next;
3428	<	p.next = tabAt(tab, j);
3428	>	Node q = p.next = tabAt(tab, j);
3429		setTabAt(tab, j, p);
3430	+	if (!collide && q != null && q.hash == p.hash)
3431	+	collide = true;
3432		p = next;
3433		}
3434		table = tab;
3435		counter.add(size);
3436	+	sc = n - (n >>> 2);
3437		}
3438		} finally {
3439	<	resizing = 0;
3439	>	sizeCtl = sc;
3440	>	}
3441	>	if (collide) { // rescan and convert to TreeBins
3442	>	Node[] tab = table;
3443	>	for (int i = 0; i < tab.length; ++i) {
3444	>	int c = 0;
3445	>	for (Node e = tabAt(tab, i); e != null; e = e.next) {
3446	>	if (++c > TREE_THRESHOLD &&
3447	>	(e.key instanceof Comparable)) {
3448	>	replaceWithTreeBin(tab, i, e.key);
3449	>	break;
3450	>	}
3451	>	}
3452	>	}
3453		}
3454		}
3455		if (!init) { // Can only happen if unsafely published.
3456		while (p != null) {
3457	<	internalPut(p.key, p.val, true);
3457	>	internalPut(p.key, p.val);
3458		p = p.next;
3459		}
3460		}
3461		}
3462		}
3463
3464	+
3465	+	// -------------------------------------------------------
3466	+
3467	+	// Sams
3468	+	/** Interface describing a void action of one argument */
3469	+	public interface Action<A> { void apply(A a); }
3470	+	/** Interface describing a void action of two arguments */
3471	+	public interface BiAction<A,B> { void apply(A a, B b); }
3472	+	/** Interface describing a function of one argument */
3473	+	public interface Fun<A,T> { T apply(A a); }
3474	+	/** Interface describing a function of two arguments */
3475	+	public interface BiFun<A,B,T> { T apply(A a, B b); }
3476	+	/** Interface describing a function of no arguments */
3477	+	public interface Generator<T> { T apply(); }
3478	+	/** Interface describing a function mapping its argument to a double */
3479	+	public interface ObjectToDouble<A> { double apply(A a); }
3480	+	/** Interface describing a function mapping its argument to a long */
3481	+	public interface ObjectToLong<A> { long apply(A a); }
3482	+	/** Interface describing a function mapping its argument to an int */
3483	+	public interface ObjectToInt<A> {int apply(A a); }
3484	+	/** Interface describing a function mapping two arguments to a double */
3485	+	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
3486	+	/** Interface describing a function mapping two arguments to a long */
3487	+	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
3488	+	/** Interface describing a function mapping two arguments to an int */
3489	+	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
3490	+	/** Interface describing a function mapping a double to a double */
3491	+	public interface DoubleToDouble { double apply(double a); }
3492	+	/** Interface describing a function mapping a long to a long */
3493	+	public interface LongToLong { long apply(long a); }
3494	+	/** Interface describing a function mapping an int to an int */
3495	+	public interface IntToInt { int apply(int a); }
3496	+	/** Interface describing a function mapping two doubles to a double */
3497	+	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
3498	+	/** Interface describing a function mapping two longs to a long */
3499	+	public interface LongByLongToLong { long apply(long a, long b); }
3500	+	/** Interface describing a function mapping two ints to an int */
3501	+	public interface IntByIntToInt { int apply(int a, int b); }
3502	+
3503	+
3504	+	// -------------------------------------------------------
3505	+
3506	+	/**
3507	+	* Returns an extended {@link Parallel} view of this map using the
3508	+	* given executor for bulk parallel operations.
3509	+	*
3510	+	* @param executor the executor
3511	+	* @return a parallel view
3512	+	*/
3513	+	public Parallel parallel(ForkJoinPool executor)  {
3514	+	return new Parallel(executor);
3515	+	}
3516	+
3517	+	/**
3518	+	* An extended view of a ConcurrentHashMap supporting bulk
3519	+	* parallel operations. These operations are designed to be
3520	+	* safely, and often sensibly, applied even with maps that are
3521	+	* being concurrently updated by other threads; for example, when
3522	+	* computing a snapshot summary of the values in a shared
3523	+	* registry.  There are three kinds of operation, each with four
3524	+	* forms, accepting functions with Keys, Values, Entries, and
3525	+	* (Key, Value) arguments and/or return values. Because the
3526	+	* elements of a ConcurrentHashMap are not ordered in any
3527	+	* particular way, and may be processed in different orders in
3528	+	* different parallel executions, the correctness of supplied
3529	+	* functions should not depend on any ordering, or on any other
3530	+	* objects or values that may transiently change while computation
3531	+	* is in progress; and except for forEach actions, should ideally
3532	+	* be side-effect-free.
3533	+	*
3534	+	* <ul>
3535	+	* <li> forEach: Perform a given action on each element.
3536	+	* A variant form applies a given transformation on each element
3537	+	* before performing the action.</li>
3538	+	*
3539	+	* <li> search: Return the first available non-null result of
3540	+	* applying a given function on each element; skipping further
3541	+	* search when a result is found.</li>
3542	+	*
3543	+	* <li> reduce: Accumulate each element.  The supplied reduction
3544	+	* function cannot rely on ordering (more formally, it should be
3545	+	* both associative and commutative).  There are five variants:
3546	+	*
3547	+	* <ul>
3548	+	*
3549	+	* <li> Plain reductions. (There is not a form of this method for
3550	+	* (key, value) function arguments since there is no corresponding
3551	+	* return type.)</li>
3552	+	*
3553	+	* <li> Mapped reductions that accumulate the results of a given
3554	+	* function applied to each element.</li>
3555	+	*
3556	+	* <li> Reductions to scalar doubles, longs, and ints, using a
3557	+	* given basis value.</li>
3558	+	*
3559	+	* </li>
3560	+	* </ul>
3561	+	* </ul>
3562	+	*
3563	+	* <p>The concurrency properties of the bulk operations follow
3564	+	* from those of ConcurrentHashMap: Any non-null result returned
3565	+	* from {@code get(key)} and related access methods bears a
3566	+	* happens-before relation with the associated insertion or
3567	+	* update.  The result of any bulk operation reflects the
3568	+	* composition of these per-element relations (but is not
3569	+	* necessarily atomic with respect to the map as a whole unless it
3570	+	* is somehow known to be quiescent).  Conversely, because keys
3571	+	* and values in the map are never null, null serves as a reliable
3572	+	* atomic indicator of the current lack of any result.  To
3573	+	* maintain this property, null serves as an implicit basis for
3574	+	* all non-scalar reduction operations. For the double, long, and
3575	+	* int versions, the basis should be one that, when combined with
3576	+	* any other value, returns that other value (more formally, it
3577	+	* should be the identity element for the reduction). Most common
3578	+	* reductions have these properties; for example, computing a sum
3579	+	* with basis 0 or a minimum with basis MAX_VALUE.
3580	+	*
3581	+	* <p>Search and transformation functions provided as arguments
3582	+	* should similarly return null to indicate the lack of any result
3583	+	* (in which case it is not used). In the case of mapped
3584	+	* reductions, this also enables transformations to serve as
3585	+	* filters, returning null (or, in the case of primitive
3586	+	* specializations, the identity basis) if the element should not
3587	+	* be combined. You can create compound transformations and
3588	+	* filterings by composing them yourself under this "null means
3589	+	* there is nothing there now" rule before using them in search or
3590	+	* reduce operations.
3591	+	*
3592	+	* <p>Methods accepting and/or returning Entry arguments maintain
3593	+	* key-value associations. They may be useful for example when
3594	+	* finding the key for the greatest value. Note that "plain" Entry
3595	+	* arguments can be supplied using {@code new
3596	+	* AbstractMap.SimpleEntry(k,v)}.
3597	+	*
3598	+	* <p> Bulk operations may complete abruptly, throwing an
3599	+	* exception encountered in the application of a supplied
3600	+	* function. Bear in mind when handling such exceptions that other
3601	+	* concurrently executing functions could also have thrown
3602	+	* exceptions, or would have done so if the first exception had
3603	+	* not occurred.
3604	+	*
3605	+	* <p>Parallel speedups compared to sequential processing are
3606	+	* common but not guaranteed.  Operations involving brief
3607	+	* functions on small maps may execute more slowly than sequential
3608	+	* loops if the underlying work to parallelize the computation is
3609	+	* more expensive than the computation itself. Similarly,
3610	+	* parallelization may not lead to much actual parallelism if all
3611	+	* processors are busy performing unrelated tasks.
3612	+	*
3613	+	* <p> All arguments to all task methods must be non-null.
3614	+	*
3615	+	* <p><em>jsr166e note: During transition, this class
3616	+	* uses nested functional interfaces with different names but the
3617	+	* same forms as those expected for JDK8.<em>
3618	+	*/
3619	+	public class Parallel {
3620	+	final ForkJoinPool fjp;
3621	+
3622	+	/**
3623	+	* Returns an extended view of this map using the given
3624	+	* executor for bulk parallel operations.
3625	+	*
3626	+	* @param executor the executor
3627	+	*/
3628	+	public Parallel(ForkJoinPool executor)  {
3629	+	this.fjp = executor;
3630	+	}
3631	+
3632	+	/**
3633	+	* Performs the given action for each (key, value).
3634	+	*
3635	+	* @param action the action
3636	+	*/
3637	+	public void forEach(BiAction<K,V> action) {
3638	+	fjp.invoke(ForkJoinTasks.forEach
3639	+	(ConcurrentHashMapV8.this, action));
3640	+	}
3641	+
3642	+	/**
3643	+	* Performs the given action for each non-null transformation
3644	+	* of each (key, value).
3645	+	*
3646	+	* @param transformer a function returning the transformation
3647	+	* for an element, or null of there is no transformation (in
3648	+	* which case the action is not applied).
3649	+	* @param action the action
3650	+	*/
3651	+	public <U> void forEach(BiFun<? super K, ? super V, ? extends U> transformer,
3652	+	Action<U> action) {
3653	+	fjp.invoke(ForkJoinTasks.forEach
3654	+	(ConcurrentHashMapV8.this, transformer, action));
3655	+	}
3656	+
3657	+	/**
3658	+	* Returns a non-null result from applying the given search
3659	+	* function on each (key, value), or null if none.  Further
3660	+	* element processing is suppressed upon success. However,
3661	+	* this method does not return until other in-progress
3662	+	* parallel invocations of the search function also complete.
3663	+	*
3664	+	* @param searchFunction a function returning a non-null
3665	+	* result on success, else null
3666	+	* @return a non-null result from applying the given search
3667	+	* function on each (key, value), or null if none
3668	+	*/
3669	+	public <U> U search(BiFun<? super K, ? super V, ? extends U> searchFunction) {
3670	+	return fjp.invoke(ForkJoinTasks.search
3671	+	(ConcurrentHashMapV8.this, searchFunction));
3672	+	}
3673	+
3674	+	/**
3675	+	* Returns the result of accumulating the given transformation
3676	+	* of all (key, value) pairs using the given reducer to
3677	+	* combine values, or null if none.
3678	+	*
3679	+	* @param transformer a function returning the transformation
3680	+	* for an element, or null of there is no transformation (in
3681	+	* which case it is not combined).
3682	+	* @param reducer a commutative associative combining function
3683	+	* @return the result of accumulating the given transformation
3684	+	* of all (key, value) pairs
3685	+	*/
3686	+	public <U> U reduce(BiFun<? super K, ? super V, ? extends U> transformer,
3687	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3688	+	return fjp.invoke(ForkJoinTasks.reduce
3689	+	(ConcurrentHashMapV8.this, transformer, reducer));
3690	+	}
3691	+
3692	+	/**
3693	+	* Returns the result of accumulating the given transformation
3694	+	* of all (key, value) pairs using the given reducer to
3695	+	* combine values, and the given basis as an identity value.
3696	+	*
3697	+	* @param transformer a function returning the transformation
3698	+	* for an element
3699	+	* @param basis the identity (initial default value) for the reduction
3700	+	* @param reducer a commutative associative combining function
3701	+	* @return the result of accumulating the given transformation
3702	+	* of all (key, value) pairs
3703	+	*/
3704	+	public double reduceToDouble(ObjectByObjectToDouble<? super K, ? super V> transformer,
3705	+	double basis,
3706	+	DoubleByDoubleToDouble reducer) {
3707	+	return fjp.invoke(ForkJoinTasks.reduceToDouble
3708	+	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3709	+	}
3710	+
3711	+	/**
3712	+	* Returns the result of accumulating the given transformation
3713	+	* of all (key, value) pairs using the given reducer to
3714	+	* combine values, and the given basis as an identity value.
3715	+	*
3716	+	* @param transformer a function returning the transformation
3717	+	* for an element
3718	+	* @param basis the identity (initial default value) for the reduction
3719	+	* @param reducer a commutative associative combining function
3720	+	* @return 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	+	public long reduceToLong(ObjectByObjectToLong<? super K, ? super V> transformer,
3725	+	long basis,
3726	+	LongByLongToLong reducer) {
3727	+	return fjp.invoke(ForkJoinTasks.reduceToLong
3728	+	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3729	+	}
3730	+
3731	+	/**
3732	+	* Returns the result of accumulating the given transformation
3733	+	* of all (key, value) pairs using the given reducer to
3734	+	* combine values, and the given basis as an identity value.
3735	+	*
3736	+	* @param transformer a function returning the transformation
3737	+	* for an element
3738	+	* @param basis the identity (initial default value) for the reduction
3739	+	* @param reducer a commutative associative combining function
3740	+	* @return the result of accumulating the given transformation
3741	+	* of all (key, value) pairs
3742	+	*/
3743	+	public int reduceToInt(ObjectByObjectToInt<? super K, ? super V> transformer,
3744	+	int basis,
3745	+	IntByIntToInt reducer) {
3746	+	return fjp.invoke(ForkJoinTasks.reduceToInt
3747	+	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3748	+	}
3749	+
3750	+	/**
3751	+	* Performs the given action for each key.
3752	+	*
3753	+	* @param action the action
3754	+	*/
3755	+	public void forEachKey(Action<K> action) {
3756	+	fjp.invoke(ForkJoinTasks.forEachKey
3757	+	(ConcurrentHashMapV8.this, action));
3758	+	}
3759	+
3760	+	/**
3761	+	* Performs the given action for each non-null transformation
3762	+	* of each key.
3763	+	*
3764	+	* @param transformer a function returning the transformation
3765	+	* for an element, or null of there is no transformation (in
3766	+	* which case the action is not applied).
3767	+	* @param action the action
3768	+	*/
3769	+	public <U> void forEachKey(Fun<? super K, ? extends U> transformer,
3770	+	Action<U> action) {
3771	+	fjp.invoke(ForkJoinTasks.forEachKey
3772	+	(ConcurrentHashMapV8.this, transformer, action));
3773	+	}
3774	+
3775	+	/**
3776	+	* Returns a non-null result from applying the given search
3777	+	* function on each key, or null if none.  Further element
3778	+	* processing is suppressed upon success. However, this method
3779	+	* does not return until other in-progress parallel
3780	+	* invocations of the search function also complete.
3781	+	*
3782	+	* @param searchFunction a function returning a non-null
3783	+	* result on success, else null
3784	+	* @return a non-null result from applying the given search
3785	+	* function on each key, or null if none
3786	+	*/
3787	+	public <U> U searchKeys(Fun<? super K, ? extends U> searchFunction) {
3788	+	return fjp.invoke(ForkJoinTasks.searchKeys
3789	+	(ConcurrentHashMapV8.this, searchFunction));
3790	+	}
3791	+
3792	+	/**
3793	+	* Returns the result of accumulating all keys using the given
3794	+	* reducer to combine values, or null if none.
3795	+	*
3796	+	* @param reducer a commutative associative combining function
3797	+	* @return the result of accumulating all keys using the given
3798	+	* reducer to combine values, or null if none
3799	+	*/
3800	+	public K reduceKeys(BiFun<? super K, ? super K, ? extends K> reducer) {
3801	+	return fjp.invoke(ForkJoinTasks.reduceKeys
3802	+	(ConcurrentHashMapV8.this, reducer));
3803	+	}
3804	+
3805	+	/**
3806	+	* Returns the result of accumulating the given transformation
3807	+	* of all keys using the given reducer to combine values, or
3808	+	* null if none.
3809	+	*
3810	+	* @param transformer a function returning the transformation
3811	+	* for an element, or null of there is no transformation (in
3812	+	* which case it is not combined).
3813	+	* @param reducer a commutative associative combining function
3814	+	* @return the result of accumulating the given transformation
3815	+	* of all keys
3816	+	*/
3817	+	public <U> U reduceKeys(Fun<? super K, ? extends U> transformer,
3818	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3819	+	return fjp.invoke(ForkJoinTasks.reduceKeys
3820	+	(ConcurrentHashMapV8.this, transformer, reducer));
3821	+	}
3822	+
3823	+	/**
3824	+	* Returns the result of accumulating the given transformation
3825	+	* of all keys using the given reducer to combine values, and
3826	+	* the given basis as an identity value.
3827	+	*
3828	+	* @param transformer a function returning the transformation
3829	+	* for an element
3830	+	* @param basis the identity (initial default value) for the reduction
3831	+	* @param reducer a commutative associative combining function
3832	+	* @return  the result of accumulating the given transformation
3833	+	* of all keys
3834	+	*/
3835	+	public double reduceKeysToDouble(ObjectToDouble<? super K> transformer,
3836	+	double basis,
3837	+	DoubleByDoubleToDouble reducer) {
3838	+	return fjp.invoke(ForkJoinTasks.reduceKeysToDouble
3839	+	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3840	+	}
3841	+
3842	+	/**
3843	+	* Returns the result of accumulating the given transformation
3844	+	* of all keys using the given reducer to combine values, and
3845	+	* the given basis as an identity value.
3846	+	*
3847	+	* @param transformer a function returning the transformation
3848	+	* for an element
3849	+	* @param basis the identity (initial default value) for the reduction
3850	+	* @param reducer a commutative associative combining function
3851	+	* @return the result of accumulating the given transformation
3852	+	* of all keys
3853	+	*/
3854	+	public long reduceKeysToLong(ObjectToLong<? super K> transformer,
3855	+	long basis,
3856	+	LongByLongToLong reducer) {
3857	+	return fjp.invoke(ForkJoinTasks.reduceKeysToLong
3858	+	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3859	+	}
3860	+
3861	+	/**
3862	+	* Returns the result of accumulating the given transformation
3863	+	* of all keys using the given reducer to combine values, and
3864	+	* the given basis as an identity value.
3865	+	*
3866	+	* @param transformer a function returning the transformation
3867	+	* for an element
3868	+	* @param basis the identity (initial default value) for the reduction
3869	+	* @param reducer a commutative associative combining function
3870	+	* @return the result of accumulating the given transformation
3871	+	* of all keys
3872	+	*/
3873	+	public int reduceKeysToInt(ObjectToInt<? super K> transformer,
3874	+	int basis,
3875	+	IntByIntToInt reducer) {
3876	+	return fjp.invoke(ForkJoinTasks.reduceKeysToInt
3877	+	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3878	+	}
3879	+
3880	+	/**
3881	+	* Performs the given action for each value.
3882	+	*
3883	+	* @param action the action
3884	+	*/
3885	+	public void forEachValue(Action<V> action) {
3886	+	fjp.invoke(ForkJoinTasks.forEachValue
3887	+	(ConcurrentHashMapV8.this, action));
3888	+	}
3889	+
3890	+	/**
3891	+	* Performs the given action for each non-null transformation
3892	+	* of each value.
3893	+	*
3894	+	* @param transformer a function returning the transformation
3895	+	* for an element, or null of there is no transformation (in
3896	+	* which case the action is not applied).
3897	+	*/
3898	+	public <U> void forEachValue(Fun<? super V, ? extends U> transformer,
3899	+	Action<U> action) {
3900	+	fjp.invoke(ForkJoinTasks.forEachValue
3901	+	(ConcurrentHashMapV8.this, transformer, action));
3902	+	}
3903	+
3904	+	/**
3905	+	* Returns a non-null result from applying the given search
3906	+	* function on each value, or null if none.  Further element
3907	+	* processing is suppressed upon success. However, this method
3908	+	* does not return until other in-progress parallel
3909	+	* invocations of the search function also complete.
3910	+	*
3911	+	* @param searchFunction a function returning a non-null
3912	+	* result on success, else null
3913	+	* @return a non-null result from applying the given search
3914	+	* function on each value, or null if none
3915	+	*
3916	+	*/
3917	+	public <U> U searchValues(Fun<? super V, ? extends U> searchFunction) {
3918	+	return fjp.invoke(ForkJoinTasks.searchValues
3919	+	(ConcurrentHashMapV8.this, searchFunction));
3920	+	}
3921	+
3922	+	/**
3923	+	* Returns the result of accumulating all values using the
3924	+	* given reducer to combine values, or null if none.
3925	+	*
3926	+	* @param reducer a commutative associative combining function
3927	+	* @return  the result of accumulating all values
3928	+	*/
3929	+	public V reduceValues(BiFun<? super V, ? super V, ? extends V> reducer) {
3930	+	return fjp.invoke(ForkJoinTasks.reduceValues
3931	+	(ConcurrentHashMapV8.this, reducer));
3932	+	}
3933	+
3934	+	/**
3935	+	* Returns the result of accumulating the given transformation
3936	+	* of all values using the given reducer to combine values, or
3937	+	* null if none.
3938	+	*
3939	+	* @param transformer a function returning the transformation
3940	+	* for an element, or null of there is no transformation (in
3941	+	* which case it is not combined).
3942	+	* @param reducer a commutative associative combining function
3943	+	* @return the result of accumulating the given transformation
3944	+	* of all values
3945	+	*/
3946	+	public <U> U reduceValues(Fun<? super V, ? extends U> transformer,
3947	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3948	+	return fjp.invoke(ForkJoinTasks.reduceValues
3949	+	(ConcurrentHashMapV8.this, transformer, reducer));
3950	+	}
3951	+
3952	+	/**
3953	+	* Returns the result of accumulating the given transformation
3954	+	* of all values using the given reducer to combine values,
3955	+	* and the given basis as an identity value.
3956	+	*
3957	+	* @param transformer a function returning the transformation
3958	+	* for an element
3959	+	* @param basis the identity (initial default value) for the reduction
3960	+	* @param reducer a commutative associative combining function
3961	+	* @return the result of accumulating the given transformation
3962	+	* of all values
3963	+	*/
3964	+	public double reduceValuesToDouble(ObjectToDouble<? super V> transformer,
3965	+	double basis,
3966	+	DoubleByDoubleToDouble reducer) {
3967	+	return fjp.invoke(ForkJoinTasks.reduceValuesToDouble
3968	+	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3969	+	}
3970	+
3971	+	/**
3972	+	* Returns the result of accumulating the given transformation
3973	+	* of all values using the given reducer to combine values,
3974	+	* and the given basis as an identity value.
3975	+	*
3976	+	* @param transformer a function returning the transformation
3977	+	* for an element
3978	+	* @param basis the identity (initial default value) for the reduction
3979	+	* @param reducer a commutative associative combining function
3980	+	* @return the result of accumulating the given transformation
3981	+	* of all values
3982	+	*/
3983	+	public long reduceValuesToLong(ObjectToLong<? super V> transformer,
3984	+	long basis,
3985	+	LongByLongToLong reducer) {
3986	+	return fjp.invoke(ForkJoinTasks.reduceValuesToLong
3987	+	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3988	+	}
3989	+
3990	+	/**
3991	+	* Returns the result of accumulating the given transformation
3992	+	* of all values using the given reducer to combine values,
3993	+	* and the given basis as an identity value.
3994	+	*
3995	+	* @param transformer a function returning the transformation
3996	+	* for an element
3997	+	* @param basis the identity (initial default value) for the reduction
3998	+	* @param reducer a commutative associative combining function
3999	+	* @return the result of accumulating the given transformation
4000	+	* of all values
4001	+	*/
4002	+	public int reduceValuesToInt(ObjectToInt<? super V> transformer,
4003	+	int basis,
4004	+	IntByIntToInt reducer) {
4005	+	return fjp.invoke(ForkJoinTasks.reduceValuesToInt
4006	+	(ConcurrentHashMapV8.this, transformer, basis, reducer));
4007	+	}
4008	+
4009	+	/**
4010	+	* Performs the given action for each entry.
4011	+	*
4012	+	* @param action the action
4013	+	*/
4014	+	public void forEachEntry(Action<Map.Entry<K,V>> action) {
4015	+	fjp.invoke(ForkJoinTasks.forEachEntry
4016	+	(ConcurrentHashMapV8.this, action));
4017	+	}
4018	+
4019	+	/**
4020	+	* Performs the given action for each non-null transformation
4021	+	* of each entry.
4022	+	*
4023	+	* @param transformer a function returning the transformation
4024	+	* for an element, or null of there is no transformation (in
4025	+	* which case the action is not applied).
4026	+	* @param action the action
4027	+	*/
4028	+	public <U> void forEachEntry(Fun<Map.Entry<K,V>, ? extends U> transformer,
4029	+	Action<U> action) {
4030	+	fjp.invoke(ForkJoinTasks.forEachEntry
4031	+	(ConcurrentHashMapV8.this, transformer, action));
4032	+	}
4033	+
4034	+	/**
4035	+	* Returns a non-null result from applying the given search
4036	+	* function on each entry, or null if none.  Further element
4037	+	* processing is suppressed upon success. However, this method
4038	+	* does not return until other in-progress parallel
4039	+	* invocations of the search function also complete.
4040	+	*
4041	+	* @param searchFunction a function returning a non-null
4042	+	* result on success, else null
4043	+	* @return a non-null result from applying the given search
4044	+	* function on each entry, or null if none
4045	+	*/
4046	+	public <U> U searchEntries(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4047	+	return fjp.invoke(ForkJoinTasks.searchEntries
4048	+	(ConcurrentHashMapV8.this, searchFunction));
4049	+	}
4050	+
4051	+	/**
4052	+	* Returns the result of accumulating all entries using the
4053	+	* given reducer to combine values, or null if none.
4054	+	*
4055	+	* @param reducer a commutative associative combining function
4056	+	* @return the result of accumulating all entries
4057	+	*/
4058	+	public Map.Entry<K,V> reduceEntries(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4059	+	return fjp.invoke(ForkJoinTasks.reduceEntries
4060	+	(ConcurrentHashMapV8.this, reducer));
4061	+	}
4062	+
4063	+	/**
4064	+	* Returns the result of accumulating the given transformation
4065	+	* of all entries using the given reducer to combine values,
4066	+	* or null if none.
4067	+	*
4068	+	* @param transformer a function returning the transformation
4069	+	* for an element, or null of there is no transformation (in
4070	+	* which case it is not combined).
4071	+	* @param reducer a commutative associative combining function
4072	+	* @return the result of accumulating the given transformation
4073	+	* of all entries
4074	+	*/
4075	+	public <U> U reduceEntries(Fun<Map.Entry<K,V>, ? extends U> transformer,
4076	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4077	+	return fjp.invoke(ForkJoinTasks.reduceEntries
4078	+	(ConcurrentHashMapV8.this, transformer, reducer));
4079	+	}
4080	+
4081	+	/**
4082	+	* Returns the result of accumulating the given transformation
4083	+	* of all entries using the given reducer to combine values,
4084	+	* and the given basis as an identity value.
4085	+	*
4086	+	* @param transformer a function returning the transformation
4087	+	* for an element
4088	+	* @param basis the identity (initial default value) for the reduction
4089	+	* @param reducer a commutative associative combining function
4090	+	* @return the result of accumulating the given transformation
4091	+	* of all entries
4092	+	*/
4093	+	public double reduceEntriesToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4094	+	double basis,
4095	+	DoubleByDoubleToDouble reducer) {
4096	+	return fjp.invoke(ForkJoinTasks.reduceEntriesToDouble
4097	+	(ConcurrentHashMapV8.this, transformer, basis, reducer));
4098	+	}
4099	+
4100	+	/**
4101	+	* Returns the result of accumulating the given transformation
4102	+	* of all entries using the given reducer to combine values,
4103	+	* and the given basis as an identity value.
4104	+	*
4105	+	* @param transformer a function returning the transformation
4106	+	* for an element
4107	+	* @param basis the identity (initial default value) for the reduction
4108	+	* @param reducer a commutative associative combining function
4109	+	* @return  the result of accumulating the given transformation
4110	+	* of all entries
4111	+	*/
4112	+	public long reduceEntriesToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4113	+	long basis,
4114	+	LongByLongToLong reducer) {
4115	+	return fjp.invoke(ForkJoinTasks.reduceEntriesToLong
4116	+	(ConcurrentHashMapV8.this, transformer, basis, reducer));
4117	+	}
4118	+
4119	+	/**
4120	+	* Returns the result of accumulating the given transformation
4121	+	* of all entries using the given reducer to combine values,
4122	+	* and the given basis as an identity value.
4123	+	*
4124	+	* @param transformer a function returning the transformation
4125	+	* for an element
4126	+	* @param basis the identity (initial default value) for the reduction
4127	+	* @param reducer a commutative associative combining function
4128	+	* @return the result of accumulating the given transformation
4129	+	* of all entries
4130	+	*/
4131	+	public int reduceEntriesToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4132	+	int basis,
4133	+	IntByIntToInt reducer) {
4134	+	return fjp.invoke(ForkJoinTasks.reduceEntriesToInt
4135	+	(ConcurrentHashMapV8.this, transformer, basis, reducer));
4136	+	}
4137	+	}
4138	+
4139	+	// ---------------------------------------------------------------------
4140	+
4141	+	/**
4142	+	* Predefined tasks for performing bulk parallel operations on
4143	+	* ConcurrentHashMaps. These tasks follow the forms and rules used
4144	+	* in class {@link Parallel}. Each method has the same name, but
4145	+	* returns a task rather than invoking it. These methods may be
4146	+	* useful in custom applications such as submitting a task without
4147	+	* waiting for completion, or combining with other tasks.
4148	+	*/
4149	+	public static class ForkJoinTasks {
4150	+	private ForkJoinTasks() {}
4151	+
4152	+	/**
4153	+	* Returns a task that when invoked, performs the given
4154	+	* action for each (key, value)
4155	+	*
4156	+	* @param map the map
4157	+	* @param action the action
4158	+	* @return the task
4159	+	*/
4160	+	public static <K,V> ForkJoinTask<Void> forEach
4161	+	(ConcurrentHashMapV8<K,V> map,
4162	+	BiAction<K,V> action) {
4163	+	if (action == null) throw new NullPointerException();
4164	+	return new ForEachMappingTask<K,V>(map, action);
4165	+	}
4166	+
4167	+	/**
4168	+	* Returns a task that when invoked, performs the given
4169	+	* action for each non-null transformation of each (key, value)
4170	+	*
4171	+	* @param map the map
4172	+	* @param transformer a function returning the transformation
4173	+	* for an element, or null of there is no transformation (in
4174	+	* which case the action is not applied).
4175	+	* @param action the action
4176	+	* @return the task
4177	+	*/
4178	+	public static <K,V,U> ForkJoinTask<Void> forEach
4179	+	(ConcurrentHashMapV8<K,V> map,
4180	+	BiFun<? super K, ? super V, ? extends U> transformer,
4181	+	Action<U> action) {
4182	+	if (transformer == null || action == null)
4183	+	throw new NullPointerException();
4184	+	return new ForEachTransformedMappingTask<K,V,U>
4185	+	(map, transformer, action);
4186	+	}
4187	+
4188	+	/**
4189	+	* Returns a task that when invoked, returns a non-null
4190	+	* result from applying the given search function on each
4191	+	* (key, value), or null if none.  Further element processing
4192	+	* is suppressed upon success. However, this method does not
4193	+	* return until other in-progress parallel invocations of the
4194	+	* search function also complete.
4195	+	*
4196	+	* @param map the map
4197	+	* @param searchFunction a function returning a non-null
4198	+	* result on success, else null
4199	+	* @return the task
4200	+	*/
4201	+	public static <K,V,U> ForkJoinTask<U> search
4202	+	(ConcurrentHashMapV8<K,V> map,
4203	+	BiFun<? super K, ? super V, ? extends U> searchFunction) {
4204	+	if (searchFunction == null) throw new NullPointerException();
4205	+	return new SearchMappingsTask<K,V,U>
4206	+	(map, searchFunction,
4207	+	new AtomicReference<U>());
4208	+	}
4209	+
4210	+	/**
4211	+	* Returns a task that when invoked, returns the result of
4212	+	* accumulating the given transformation of all (key, value) pairs
4213	+	* using the given reducer to combine values, or null if none.
4214	+	*
4215	+	* @param map the map
4216	+	* @param transformer a function returning the transformation
4217	+	* for an element, or null of there is no transformation (in
4218	+	* which case it is not combined).
4219	+	* @param reducer a commutative associative combining function
4220	+	* @return the task
4221	+	*/
4222	+	public static <K,V,U> ForkJoinTask<U> reduce
4223	+	(ConcurrentHashMapV8<K,V> map,
4224	+	BiFun<? super K, ? super V, ? extends U> transformer,
4225	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4226	+	if (transformer == null || reducer == null)
4227	+	throw new NullPointerException();
4228	+	return new MapReduceMappingsTask<K,V,U>
4229	+	(map, transformer, reducer);
4230	+	}
4231	+
4232	+	/**
4233	+	* Returns a task that when invoked, returns the result of
4234	+	* accumulating the given transformation of all (key, value) pairs
4235	+	* using the given reducer to combine values, and the given
4236	+	* basis as an identity value.
4237	+	*
4238	+	* @param map the map
4239	+	* @param transformer a function returning the transformation
4240	+	* for an element
4241	+	* @param basis the identity (initial default value) for the reduction
4242	+	* @param reducer a commutative associative combining function
4243	+	* @return the task
4244	+	*/
4245	+	public static <K,V> ForkJoinTask<Double> reduceToDouble
4246	+	(ConcurrentHashMapV8<K,V> map,
4247	+	ObjectByObjectToDouble<? super K, ? super V> transformer,
4248	+	double basis,
4249	+	DoubleByDoubleToDouble reducer) {
4250	+	if (transformer == null || reducer == null)
4251	+	throw new NullPointerException();
4252	+	return new MapReduceMappingsToDoubleTask<K,V>
4253	+	(map, transformer, basis, reducer);
4254	+	}
4255	+
4256	+	/**
4257	+	* Returns a task that when invoked, returns the result of
4258	+	* accumulating the given transformation of all (key, value) pairs
4259	+	* using the given reducer to combine values, and the given
4260	+	* basis as an identity value.
4261	+	*
4262	+	* @param map the map
4263	+	* @param transformer a function returning the transformation
4264	+	* for an element
4265	+	* @param basis the identity (initial default value) for the reduction
4266	+	* @param reducer a commutative associative combining function
4267	+	* @return the task
4268	+	*/
4269	+	public static <K,V> ForkJoinTask<Long> reduceToLong
4270	+	(ConcurrentHashMapV8<K,V> map,
4271	+	ObjectByObjectToLong<? super K, ? super V> transformer,
4272	+	long basis,
4273	+	LongByLongToLong reducer) {
4274	+	if (transformer == null || reducer == null)
4275	+	throw new NullPointerException();
4276	+	return new MapReduceMappingsToLongTask<K,V>
4277	+	(map, transformer, basis, reducer);
4278	+	}
4279	+
4280	+	/**
4281	+	* Returns a task that when invoked, returns the result of
4282	+	* accumulating the given transformation of all (key, value) pairs
4283	+	* using the given reducer to combine values, and the given
4284	+	* basis as an identity value.
4285	+	*
4286	+	* @param transformer a function returning the transformation
4287	+	* for an element
4288	+	* @param basis the identity (initial default value) for the reduction
4289	+	* @param reducer a commutative associative combining function
4290	+	* @return the task
4291	+	*/
4292	+	public static <K,V> ForkJoinTask<Integer> reduceToInt
4293	+	(ConcurrentHashMapV8<K,V> map,
4294	+	ObjectByObjectToInt<? super K, ? super V> transformer,
4295	+	int basis,
4296	+	IntByIntToInt reducer) {
4297	+	if (transformer == null || reducer == null)
4298	+	throw new NullPointerException();
4299	+	return new MapReduceMappingsToIntTask<K,V>
4300	+	(map, transformer, basis, reducer);
4301	+	}
4302	+
4303	+	/**
4304	+	* Returns a task that when invoked, performs the given action
4305	+	* for each key.
4306	+	*
4307	+	* @param map the map
4308	+	* @param action the action
4309	+	* @return the task
4310	+	*/
4311	+	public static <K,V> ForkJoinTask<Void> forEachKey
4312	+	(ConcurrentHashMapV8<K,V> map,
4313	+	Action<K> action) {
4314	+	if (action == null) throw new NullPointerException();
4315	+	return new ForEachKeyTask<K,V>(map, action);
4316	+	}
4317	+
4318	+	/**
4319	+	* Returns a task that when invoked, performs the given action
4320	+	* for each non-null transformation of each key.
4321	+	*
4322	+	* @param map the map
4323	+	* @param transformer a function returning the transformation
4324	+	* for an element, or null of there is no transformation (in
4325	+	* which case the action is not applied).
4326	+	* @param action the action
4327	+	* @return the task
4328	+	*/
4329	+	public static <K,V,U> ForkJoinTask<Void> forEachKey
4330	+	(ConcurrentHashMapV8<K,V> map,
4331	+	Fun<? super K, ? extends U> transformer,
4332	+	Action<U> action) {
4333	+	if (transformer == null || action == null)
4334	+	throw new NullPointerException();
4335	+	return new ForEachTransformedKeyTask<K,V,U>
4336	+	(map, transformer, action);
4337	+	}
4338	+
4339	+	/**
4340	+	* Returns a task that when invoked, returns a non-null result
4341	+	* from applying the given search function on each key, or
4342	+	* null if none.  Further element processing is suppressed
4343	+	* upon success. However, this method does not return until
4344	+	* other in-progress parallel invocations of the search
4345	+	* function also complete.
4346	+	*
4347	+	* @param map the map
4348	+	* @param searchFunction a function returning a non-null
4349	+	* result on success, else null
4350	+	* @return the task
4351	+	*/
4352	+	public static <K,V,U> ForkJoinTask<U> searchKeys
4353	+	(ConcurrentHashMapV8<K,V> map,
4354	+	Fun<? super K, ? extends U> searchFunction) {
4355	+	if (searchFunction == null) throw new NullPointerException();
4356	+	return new SearchKeysTask<K,V,U>
4357	+	(map, searchFunction,
4358	+	new AtomicReference<U>());
4359	+	}
4360	+
4361	+	/**
4362	+	* Returns a task that when invoked, returns the result of
4363	+	* accumulating all keys using the given reducer to combine
4364	+	* values, or null if none.
4365	+	*
4366	+	* @param map the map
4367	+	* @param reducer a commutative associative combining function
4368	+	* @return the task
4369	+	*/
4370	+	public static <K,V> ForkJoinTask<K> reduceKeys
4371	+	(ConcurrentHashMapV8<K,V> map,
4372	+	BiFun<? super K, ? super K, ? extends K> reducer) {
4373	+	if (reducer == null) throw new NullPointerException();
4374	+	return new ReduceKeysTask<K,V>
4375	+	(map, reducer);
4376	+	}
4377	+	/**
4378	+	* Returns a task that when invoked, returns the result of
4379	+	* accumulating the given transformation of all keys using the given
4380	+	* reducer to combine values, or null if none.
4381	+	*
4382	+	* @param map the map
4383	+	* @param transformer a function returning the transformation
4384	+	* for an element, or null of there is no transformation (in
4385	+	* which case it is not combined).
4386	+	* @param reducer a commutative associative combining function
4387	+	* @return the task
4388	+	*/
4389	+	public static <K,V,U> ForkJoinTask<U> reduceKeys
4390	+	(ConcurrentHashMapV8<K,V> map,
4391	+	Fun<? super K, ? extends U> transformer,
4392	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4393	+	if (transformer == null || reducer == null)
4394	+	throw new NullPointerException();
4395	+	return new MapReduceKeysTask<K,V,U>
4396	+	(map, transformer, reducer);
4397	+	}
4398	+
4399	+	/**
4400	+	* Returns a task that when invoked, returns the result of
4401	+	* accumulating the given transformation of all keys using the given
4402	+	* reducer to combine values, and the given basis as an
4403	+	* identity value.
4404	+	*
4405	+	* @param map the map
4406	+	* @param transformer a function returning the transformation
4407	+	* for an element
4408	+	* @param basis the identity (initial default value) for the reduction
4409	+	* @param reducer a commutative associative combining function
4410	+	* @return the task
4411	+	*/
4412	+	public static <K,V> ForkJoinTask<Double> reduceKeysToDouble
4413	+	(ConcurrentHashMapV8<K,V> map,
4414	+	ObjectToDouble<? super K> transformer,
4415	+	double basis,
4416	+	DoubleByDoubleToDouble reducer) {
4417	+	if (transformer == null || reducer == null)
4418	+	throw new NullPointerException();
4419	+	return new MapReduceKeysToDoubleTask<K,V>
4420	+	(map, transformer, basis, reducer);
4421	+	}
4422	+
4423	+	/**
4424	+	* Returns a task that when invoked, returns the result of
4425	+	* accumulating the given transformation of all keys using the given
4426	+	* reducer to combine values, and the given basis as an
4427	+	* identity value.
4428	+	*
4429	+	* @param map the map
4430	+	* @param transformer a function returning the transformation
4431	+	* for an element
4432	+	* @param basis the identity (initial default value) for the reduction
4433	+	* @param reducer a commutative associative combining function
4434	+	* @return the task
4435	+	*/
4436	+	public static <K,V> ForkJoinTask<Long> reduceKeysToLong
4437	+	(ConcurrentHashMapV8<K,V> map,
4438	+	ObjectToLong<? super K> transformer,
4439	+	long basis,
4440	+	LongByLongToLong reducer) {
4441	+	if (transformer == null || reducer == null)
4442	+	throw new NullPointerException();
4443	+	return new MapReduceKeysToLongTask<K,V>
4444	+	(map, transformer, basis, reducer);
4445	+	}
4446	+
4447	+	/**
4448	+	* Returns a task that when invoked, returns the result of
4449	+	* accumulating the given transformation of all keys using the given
4450	+	* reducer to combine values, and the given basis as an
4451	+	* identity value.
4452	+	*
4453	+	* @param map the map
4454	+	* @param transformer a function returning the transformation
4455	+	* for an element
4456	+	* @param basis the identity (initial default value) for the reduction
4457	+	* @param reducer a commutative associative combining function
4458	+	* @return the task
4459	+	*/
4460	+	public static <K,V> ForkJoinTask<Integer> reduceKeysToInt
4461	+	(ConcurrentHashMapV8<K,V> map,
4462	+	ObjectToInt<? super K> transformer,
4463	+	int basis,
4464	+	IntByIntToInt reducer) {
4465	+	if (transformer == null || reducer == null)
4466	+	throw new NullPointerException();
4467	+	return new MapReduceKeysToIntTask<K,V>
4468	+	(map, transformer, basis, reducer);
4469	+	}
4470	+
4471	+	/**
4472	+	* Returns a task that when invoked, performs the given action
4473	+	* for each value.
4474	+	*
4475	+	* @param map the map
4476	+	* @param action the action
4477	+	*/
4478	+	public static <K,V> ForkJoinTask<Void> forEachValue
4479	+	(ConcurrentHashMapV8<K,V> map,
4480	+	Action<V> action) {
4481	+	if (action == null) throw new NullPointerException();
4482	+	return new ForEachValueTask<K,V>(map, action);
4483	+	}
4484	+
4485	+	/**
4486	+	* Returns a task that when invoked, performs the given action
4487	+	* for each non-null transformation of each value.
4488	+	*
4489	+	* @param map the map
4490	+	* @param transformer a function returning the transformation
4491	+	* for an element, or null of there is no transformation (in
4492	+	* which case the action is not applied).
4493	+	* @param action the action
4494	+	*/
4495	+	public static <K,V,U> ForkJoinTask<Void> forEachValue
4496	+	(ConcurrentHashMapV8<K,V> map,
4497	+	Fun<? super V, ? extends U> transformer,
4498	+	Action<U> action) {
4499	+	if (transformer == null || action == null)
4500	+	throw new NullPointerException();
4501	+	return new ForEachTransformedValueTask<K,V,U>
4502	+	(map, transformer, action);
4503	+	}
4504	+
4505	+	/**
4506	+	* Returns a task that when invoked, returns a non-null result
4507	+	* from applying the given search function on each value, or
4508	+	* null if none.  Further element processing is suppressed
4509	+	* upon success. However, this method does not return until
4510	+	* other in-progress parallel invocations of the search
4511	+	* function also complete.
4512	+	*
4513	+	* @param map the map
4514	+	* @param searchFunction a function returning a non-null
4515	+	* result on success, else null
4516	+	* @return the task
4517	+	*
4518	+	*/
4519	+	public static <K,V,U> ForkJoinTask<U> searchValues
4520	+	(ConcurrentHashMapV8<K,V> map,
4521	+	Fun<? super V, ? extends U> searchFunction) {
4522	+	if (searchFunction == null) throw new NullPointerException();
4523	+	return new SearchValuesTask<K,V,U>
4524	+	(map, searchFunction,
4525	+	new AtomicReference<U>());
4526	+	}
4527	+
4528	+	/**
4529	+	* Returns a task that when invoked, returns the result of
4530	+	* accumulating all values using the given reducer to combine
4531	+	* values, or null if none.
4532	+	*
4533	+	* @param map the map
4534	+	* @param reducer a commutative associative combining function
4535	+	* @return the task
4536	+	*/
4537	+	public static <K,V> ForkJoinTask<V> reduceValues
4538	+	(ConcurrentHashMapV8<K,V> map,
4539	+	BiFun<? super V, ? super V, ? extends V> reducer) {
4540	+	if (reducer == null) throw new NullPointerException();
4541	+	return new ReduceValuesTask<K,V>
4542	+	(map, reducer);
4543	+	}
4544	+
4545	+	/**
4546	+	* Returns a task that when invoked, returns the result of
4547	+	* accumulating the given transformation of all values using the
4548	+	* given reducer to combine values, or null if none.
4549	+	*
4550	+	* @param map the map
4551	+	* @param transformer a function returning the transformation
4552	+	* for an element, or null of there is no transformation (in
4553	+	* which case it is not combined).
4554	+	* @param reducer a commutative associative combining function
4555	+	* @return the task
4556	+	*/
4557	+	public static <K,V,U> ForkJoinTask<U> reduceValues
4558	+	(ConcurrentHashMapV8<K,V> map,
4559	+	Fun<? super V, ? extends U> transformer,
4560	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4561	+	if (transformer == null || reducer == null)
4562	+	throw new NullPointerException();
4563	+	return new MapReduceValuesTask<K,V,U>
4564	+	(map, transformer, reducer);
4565	+	}
4566	+
4567	+	/**
4568	+	* Returns a task that when invoked, returns the result of
4569	+	* accumulating the given transformation of all values using the
4570	+	* given reducer to combine values, and the given basis as an
4571	+	* identity value.
4572	+	*
4573	+	* @param map the map
4574	+	* @param transformer a function returning the transformation
4575	+	* for an element
4576	+	* @param basis the identity (initial default value) for the reduction
4577	+	* @param reducer a commutative associative combining function
4578	+	* @return the task
4579	+	*/
4580	+	public static <K,V> ForkJoinTask<Double> reduceValuesToDouble
4581	+	(ConcurrentHashMapV8<K,V> map,
4582	+	ObjectToDouble<? super V> transformer,
4583	+	double basis,
4584	+	DoubleByDoubleToDouble reducer) {
4585	+	if (transformer == null || reducer == null)
4586	+	throw new NullPointerException();
4587	+	return new MapReduceValuesToDoubleTask<K,V>
4588	+	(map, transformer, basis, reducer);
4589	+	}
4590	+
4591	+	/**
4592	+	* Returns a task that when invoked, returns the result of
4593	+	* accumulating the given transformation of all values using the
4594	+	* given reducer to combine values, and the given basis as an
4595	+	* identity value.
4596	+	*
4597	+	* @param map the map
4598	+	* @param transformer a function returning the transformation
4599	+	* for an element
4600	+	* @param basis the identity (initial default value) for the reduction
4601	+	* @param reducer a commutative associative combining function
4602	+	* @return the task
4603	+	*/
4604	+	public static <K,V> ForkJoinTask<Long> reduceValuesToLong
4605	+	(ConcurrentHashMapV8<K,V> map,
4606	+	ObjectToLong<? super V> transformer,
4607	+	long basis,
4608	+	LongByLongToLong reducer) {
4609	+	if (transformer == null || reducer == null)
4610	+	throw new NullPointerException();
4611	+	return new MapReduceValuesToLongTask<K,V>
4612	+	(map, transformer, basis, reducer);
4613	+	}
4614	+
4615	+	/**
4616	+	* Returns a task that when invoked, returns the result of
4617	+	* accumulating the given transformation of all values using the
4618	+	* given reducer to combine values, and the given basis as an
4619	+	* 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<Integer> reduceValuesToInt
4629	+	(ConcurrentHashMapV8<K,V> map,
4630	+	ObjectToInt<? super V> transformer,
4631	+	int basis,
4632	+	IntByIntToInt reducer) {
4633	+	if (transformer == null || reducer == null)
4634	+	throw new NullPointerException();
4635	+	return new MapReduceValuesToIntTask<K,V>
4636	+	(map, transformer, basis, reducer);
4637	+	}
4638	+
4639	+	/**
4640	+	* Returns a task that when invoked, perform the given action
4641	+	* for each entry.
4642	+	*
4643	+	* @param map the map
4644	+	* @param action the action
4645	+	*/
4646	+	public static <K,V> ForkJoinTask<Void> forEachEntry
4647	+	(ConcurrentHashMapV8<K,V> map,
4648	+	Action<Map.Entry<K,V>> action) {
4649	+	if (action == null) throw new NullPointerException();
4650	+	return new ForEachEntryTask<K,V>(map, action);
4651	+	}
4652	+
4653	+	/**
4654	+	* Returns a task that when invoked, perform the given action
4655	+	* for each non-null transformation of each entry.
4656	+	*
4657	+	* @param map the map
4658	+	* @param transformer a function returning the transformation
4659	+	* for an element, or null of there is no transformation (in
4660	+	* which case the action is not applied).
4661	+	* @param action the action
4662	+	*/
4663	+	public static <K,V,U> ForkJoinTask<Void> forEachEntry
4664	+	(ConcurrentHashMapV8<K,V> map,
4665	+	Fun<Map.Entry<K,V>, ? extends U> transformer,
4666	+	Action<U> action) {
4667	+	if (transformer == null || action == null)
4668	+	throw new NullPointerException();
4669	+	return new ForEachTransformedEntryTask<K,V,U>
4670	+	(map, transformer, action);
4671	+	}
4672	+
4673	+	/**
4674	+	* Returns a task that when invoked, returns a non-null result
4675	+	* from applying the given search function on each entry, or
4676	+	* null if none.  Further element processing is suppressed
4677	+	* upon success. However, this method does not return until
4678	+	* other in-progress parallel invocations of the search
4679	+	* function also complete.
4680	+	*
4681	+	* @param map the map
4682	+	* @param searchFunction a function returning a non-null
4683	+	* result on success, else null
4684	+	* @return the task
4685	+	*
4686	+	*/
4687	+	public static <K,V,U> ForkJoinTask<U> searchEntries
4688	+	(ConcurrentHashMapV8<K,V> map,
4689	+	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4690	+	if (searchFunction == null) throw new NullPointerException();
4691	+	return new SearchEntriesTask<K,V,U>
4692	+	(map, searchFunction,
4693	+	new AtomicReference<U>());
4694	+	}
4695	+
4696	+	/**
4697	+	* Returns a task that when invoked, returns the result of
4698	+	* accumulating all entries using the given reducer to combine
4699	+	* values, or null if none.
4700	+	*
4701	+	* @param map the map
4702	+	* @param reducer a commutative associative combining function
4703	+	* @return the task
4704	+	*/
4705	+	public static <K,V> ForkJoinTask<Map.Entry<K,V>> reduceEntries
4706	+	(ConcurrentHashMapV8<K,V> map,
4707	+	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4708	+	if (reducer == null) throw new NullPointerException();
4709	+	return new ReduceEntriesTask<K,V>
4710	+	(map, reducer);
4711	+	}
4712	+
4713	+	/**
4714	+	* Returns a task that when invoked, returns the result of
4715	+	* accumulating the given transformation of all entries using the
4716	+	* given reducer to combine values, or null if none.
4717	+	*
4718	+	* @param map the map
4719	+	* @param transformer a function returning the transformation
4720	+	* for an element, or null of there is no transformation (in
4721	+	* which case it is not combined).
4722	+	* @param reducer a commutative associative combining function
4723	+	* @return the task
4724	+	*/
4725	+	public static <K,V,U> ForkJoinTask<U> reduceEntries
4726	+	(ConcurrentHashMapV8<K,V> map,
4727	+	Fun<Map.Entry<K,V>, ? extends U> transformer,
4728	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4729	+	if (transformer == null || reducer == null)
4730	+	throw new NullPointerException();
4731	+	return new MapReduceEntriesTask<K,V,U>
4732	+	(map, transformer, reducer);
4733	+	}
4734	+
4735	+	/**
4736	+	* Returns a task that when invoked, returns the result of
4737	+	* accumulating the given transformation of all entries using the
4738	+	* given reducer to combine values, and the given basis as an
4739	+	* identity value.
4740	+	*
4741	+	* @param map the map
4742	+	* @param transformer a function returning the transformation
4743	+	* for an element
4744	+	* @param basis the identity (initial default value) for the reduction
4745	+	* @param reducer a commutative associative combining function
4746	+	* @return the task
4747	+	*/
4748	+	public static <K,V> ForkJoinTask<Double> reduceEntriesToDouble
4749	+	(ConcurrentHashMapV8<K,V> map,
4750	+	ObjectToDouble<Map.Entry<K,V>> transformer,
4751	+	double basis,
4752	+	DoubleByDoubleToDouble reducer) {
4753	+	if (transformer == null || reducer == null)
4754	+	throw new NullPointerException();
4755	+	return new MapReduceEntriesToDoubleTask<K,V>
4756	+	(map, transformer, basis, reducer);
4757	+	}
4758	+
4759	+	/**
4760	+	* Returns a task that when invoked, returns the result of
4761	+	* accumulating the given transformation of all entries using the
4762	+	* given reducer to combine values, and the given basis as an
4763	+	* identity value.
4764	+	*
4765	+	* @param map the map
4766	+	* @param transformer a function returning the transformation
4767	+	* for an element
4768	+	* @param basis the identity (initial default value) for the reduction
4769	+	* @param reducer a commutative associative combining function
4770	+	* @return the task
4771	+	*/
4772	+	public static <K,V> ForkJoinTask<Long> reduceEntriesToLong
4773	+	(ConcurrentHashMapV8<K,V> map,
4774	+	ObjectToLong<Map.Entry<K,V>> transformer,
4775	+	long basis,
4776	+	LongByLongToLong reducer) {
4777	+	if (transformer == null || reducer == null)
4778	+	throw new NullPointerException();
4779	+	return new MapReduceEntriesToLongTask<K,V>
4780	+	(map, transformer, basis, reducer);
4781	+	}
4782	+
4783	+	/**
4784	+	* Returns a task that when invoked, returns the result of
4785	+	* accumulating the given transformation of all entries using the
4786	+	* given reducer to combine values, and the given basis as an
4787	+	* identity value.
4788	+	*
4789	+	* @param map the map
4790	+	* @param transformer a function returning the transformation
4791	+	* for an element
4792	+	* @param basis the identity (initial default value) for the reduction
4793	+	* @param reducer a commutative associative combining function
4794	+	* @return the task
4795	+	*/
4796	+	public static <K,V> ForkJoinTask<Integer> reduceEntriesToInt
4797	+	(ConcurrentHashMapV8<K,V> map,
4798	+	ObjectToInt<Map.Entry<K,V>> transformer,
4799	+	int basis,
4800	+	IntByIntToInt reducer) {
4801	+	if (transformer == null || reducer == null)
4802	+	throw new NullPointerException();
4803	+	return new MapReduceEntriesToIntTask<K,V>
4804	+	(map, transformer, basis, reducer);
4805	+	}
4806	+	}
4807	+
4808	+	// -------------------------------------------------------
4809	+
4810	+	/**
4811	+	* Base for FJ tasks for bulk operations. This adds a variant of
4812	+	* CountedCompleters and some split and merge bookkeeping to
4813	+	* iterator functionality. The forEach and reduce methods are
4814	+	* similar to those illustrated in CountedCompleter documentation,
4815	+	* except that bottom-up reduction completions perform them within
4816	+	* their compute methods. The search methods are like forEach
4817	+	* except they continually poll for success and exit early.  Also,
4818	+	* exceptions are handled in a simpler manner, by just trying to
4819	+	* complete root task exceptionally.
4820	+	*/
4821	+	static abstract class BulkTask<K,V,R> extends Traverser<K,V,R> {
4822	+	final BulkTask<K,V,?> parent;  // completion target
4823	+	int batch;                     // split control
4824	+	int pending;                   // completion control
4825	+
4826	+	/** Constructor for root tasks */
4827	+	BulkTask(ConcurrentHashMapV8<K,V> map) {
4828	+	super(map);
4829	+	this.parent = null;
4830	+	this.batch = -1; // force call to batch() on execution
4831	+	}
4832	+
4833	+	/** Constructor for subtasks */
4834	+	BulkTask(BulkTask<K,V,?> parent, int batch, boolean split) {
4835	+	super(parent, split);
4836	+	this.parent = parent;
4837	+	this.batch = batch;
4838	+	}
4839	+
4840	+	// FJ methods
4841	+
4842	+	/**
4843	+	* Propagates completion. Note that all reduce actions
4844	+	* bypass this method to combine while completing.
4845	+	*/
4846	+	final void tryComplete() {
4847	+	BulkTask<K,V,?> a = this, s = a;
4848	+	for (int c;;) {
4849	+	if ((c = a.pending) == 0) {
4850	+	if ((a = (s = a).parent) == null) {
4851	+	s.quietlyComplete();
4852	+	break;
4853	+	}
4854	+	}
4855	+	else if (U.compareAndSwapInt(a, PENDING, c, c - 1))
4856	+	break;
4857	+	}
4858	+	}
4859	+
4860	+	/**
4861	+	* Forces root task to throw exception unless already complete.
4862	+	*/
4863	+	final void tryAbortComputation(Throwable ex) {
4864	+	for (BulkTask<K,V,?> a = this;;) {
4865	+	BulkTask<K,V,?> p = a.parent;
4866	+	if (p == null) {
4867	+	a.completeExceptionally(ex);
4868	+	break;
4869	+	}
4870	+	a = p;
4871	+	}
4872	+	}
4873	+
4874	+	public final boolean exec() {
4875	+	try {
4876	+	compute();
4877	+	}
4878	+	catch (Throwable ex) {
4879	+	tryAbortComputation(ex);
4880	+	}
4881	+	return false;
4882	+	}
4883	+
4884	+	public abstract void compute();
4885	+
4886	+	// utilities
4887	+
4888	+	/** CompareAndSet pending count */
4889	+	final boolean casPending(int cmp, int val) {
4890	+	return U.compareAndSwapInt(this, PENDING, cmp, val);
4891	+	}
4892	+
4893	+	/**
4894	+	* Returns approx exp2 of the number of times (minus one) to
4895	+	* split task by two before executing leaf action. This value
4896	+	* is faster to compute and more convenient to use as a guide
4897	+	* to splitting than is the depth, since it is used while
4898	+	* dividing by two anyway.
4899	+	*/
4900	+	final int batch() {
4901	+	int b = batch;
4902	+	if (b < 0) {
4903	+	long n = map.counter.sum();
4904	+	int sp = getPool().getParallelism() << 3; // slack of 8
4905	+	b = batch = (n <= 0L) ? 0 : (n < (long)sp) ? (int)n : sp;
4906	+	}
4907	+	return b;
4908	+	}
4909	+
4910	+	/**
4911	+	* Error message for hoisted null checks of functions
4912	+	*/
4913	+	static final String NullFunctionMessage =
4914	+	"Unexpected null function";
4915	+
4916	+	/**
4917	+	* Returns exportable snapshot entry.
4918	+	*/
4919	+	static <K,V> AbstractMap.SimpleEntry<K,V> entryFor(K k, V v) {
4920	+	return new AbstractMap.SimpleEntry(k, v);
4921	+	}
4922	+
4923	+	// Unsafe mechanics
4924	+	private static final sun.misc.Unsafe U;
4925	+	private static final long PENDING;
4926	+	static {
4927	+	try {
4928	+	U = sun.misc.Unsafe.getUnsafe();
4929	+	PENDING = U.objectFieldOffset
4930	+	(BulkTask.class.getDeclaredField("pending"));
4931	+	} catch (Exception e) {
4932	+	throw new Error(e);
4933	+	}
4934	+	}
4935	+	}
4936	+
4937	+	/*
4938	+	* Task classes. Coded in a regular but ugly format/style to
4939	+	* simplify checks that each variant differs in the right way from
4940	+	* others.
4941	+	*/
4942	+
4943	+	static final class ForEachKeyTask<K,V>
4944	+	extends BulkTask<K,V,Void> {
4945	+	final Action<K> action;
4946	+	ForEachKeyTask
4947	+	(ConcurrentHashMapV8<K,V> m,
4948	+	Action<K> action) {
4949	+	super(m);
4950	+	this.action = action;
4951	+	}
4952	+	ForEachKeyTask
4953	+	(BulkTask<K,V,?> p, int b, boolean split,
4954	+	Action<K> action) {
4955	+	super(p, b, split);
4956	+	this.action = action;
4957	+	}
4958	+	public final void compute() {
4959	+	final Action<K> action = this.action;
4960	+	if (action == null)
4961	+	throw new Error(NullFunctionMessage);
4962	+	int b = batch(), c;
4963	+	while (b > 1 && baseIndex != baseLimit) {
4964	+	do {} while (!casPending(c = pending, c+1));
4965	+	new ForEachKeyTask<K,V>(this, b >>>= 1, true, action).fork();
4966	+	}
4967	+	while (advance() != null)
4968	+	action.apply((K)nextKey);
4969	+	tryComplete();
4970	+	}
4971	+	}
4972	+
4973	+	static final class ForEachValueTask<K,V>
4974	+	extends BulkTask<K,V,Void> {
4975	+	final Action<V> action;
4976	+	ForEachValueTask
4977	+	(ConcurrentHashMapV8<K,V> m,
4978	+	Action<V> action) {
4979	+	super(m);
4980	+	this.action = action;
4981	+	}
4982	+	ForEachValueTask
4983	+	(BulkTask<K,V,?> p, int b, boolean split,
4984	+	Action<V> action) {
4985	+	super(p, b, split);
4986	+	this.action = action;
4987	+	}
4988	+	public final void compute() {
4989	+	final Action<V> action = this.action;
4990	+	if (action == null)
4991	+	throw new Error(NullFunctionMessage);
4992	+	int b = batch(), c;
4993	+	while (b > 1 && baseIndex != baseLimit) {
4994	+	do {} while (!casPending(c = pending, c+1));
4995	+	new ForEachValueTask<K,V>(this, b >>>= 1, true, action).fork();
4996	+	}
4997	+	Object v;
4998	+	while ((v = advance()) != null)
4999	+	action.apply((V)v);
5000	+	tryComplete();
5001	+	}
5002	+	}
5003	+
5004	+	static final class ForEachEntryTask<K,V>
5005	+	extends BulkTask<K,V,Void> {
5006	+	final Action<Entry<K,V>> action;
5007	+	ForEachEntryTask
5008	+	(ConcurrentHashMapV8<K,V> m,
5009	+	Action<Entry<K,V>> action) {
5010	+	super(m);
5011	+	this.action = action;
5012	+	}
5013	+	ForEachEntryTask
5014	+	(BulkTask<K,V,?> p, int b, boolean split,
5015	+	Action<Entry<K,V>> action) {
5016	+	super(p, b, split);
5017	+	this.action = action;
5018	+	}
5019	+	public final void compute() {
5020	+	final Action<Entry<K,V>> action = this.action;
5021	+	if (action == null)
5022	+	throw new Error(NullFunctionMessage);
5023	+	int b = batch(), c;
5024	+	while (b > 1 && baseIndex != baseLimit) {
5025	+	do {} while (!casPending(c = pending, c+1));
5026	+	new ForEachEntryTask<K,V>(this, b >>>= 1, true, action).fork();
5027	+	}
5028	+	Object v;
5029	+	while ((v = advance()) != null)
5030	+	action.apply(entryFor((K)nextKey, (V)v));
5031	+	tryComplete();
5032	+	}
5033	+	}
5034	+
5035	+	static final class ForEachMappingTask<K,V>
5036	+	extends BulkTask<K,V,Void> {
5037	+	final BiAction<K,V> action;
5038	+	ForEachMappingTask
5039	+	(ConcurrentHashMapV8<K,V> m,
5040	+	BiAction<K,V> action) {
5041	+	super(m);
5042	+	this.action = action;
5043	+	}
5044	+	ForEachMappingTask
5045	+	(BulkTask<K,V,?> p, int b, boolean split,
5046	+	BiAction<K,V> action) {
5047	+	super(p, b, split);
5048	+	this.action = action;
5049	+	}
5050	+
5051	+	public final void compute() {
5052	+	final BiAction<K,V> action = this.action;
5053	+	if (action == null)
5054	+	throw new Error(NullFunctionMessage);
5055	+	int b = batch(), c;
5056	+	while (b > 1 && baseIndex != baseLimit) {
5057	+	do {} while (!casPending(c = pending, c+1));
5058	+	new ForEachMappingTask<K,V>(this, b >>>= 1, true,
5059	+	action).fork();
5060	+	}
5061	+	Object v;
5062	+	while ((v = advance()) != null)
5063	+	action.apply((K)nextKey, (V)v);
5064	+	tryComplete();
5065	+	}
5066	+	}
5067	+
5068	+	static final class ForEachTransformedKeyTask<K,V,U>
5069	+	extends BulkTask<K,V,Void> {
5070	+	final Fun<? super K, ? extends U> transformer;
5071	+	final Action<U> action;
5072	+	ForEachTransformedKeyTask
5073	+	(ConcurrentHashMapV8<K,V> m,
5074	+	Fun<? super K, ? extends U> transformer,
5075	+	Action<U> action) {
5076	+	super(m);
5077	+	this.transformer = transformer;
5078	+	this.action = action;
5079	+
5080	+	}
5081	+	ForEachTransformedKeyTask
5082	+	(BulkTask<K,V,?> p, int b, boolean split,
5083	+	Fun<? super K, ? extends U> transformer,
5084	+	Action<U> action) {
5085	+	super(p, b, split);
5086	+	this.transformer = transformer;
5087	+	this.action = action;
5088	+	}
5089	+	public final void compute() {
5090	+	final Fun<? super K, ? extends U> transformer =
5091	+	this.transformer;
5092	+	final Action<U> action = this.action;
5093	+	if (transformer == null || action == null)
5094	+	throw new Error(NullFunctionMessage);
5095	+	int b = batch(), c;
5096	+	while (b > 1 && baseIndex != baseLimit) {
5097	+	do {} while (!casPending(c = pending, c+1));
5098	+	new ForEachTransformedKeyTask<K,V,U>
5099	+	(this, b >>>= 1, true, transformer, action).fork();
5100	+	}
5101	+	U u;
5102	+	while (advance() != null) {
5103	+	if ((u = transformer.apply((K)nextKey)) != null)
5104	+	action.apply(u);
5105	+	}
5106	+	tryComplete();
5107	+	}
5108	+	}
5109	+
5110	+	static final class ForEachTransformedValueTask<K,V,U>
5111	+	extends BulkTask<K,V,Void> {
5112	+	final Fun<? super V, ? extends U> transformer;
5113	+	final Action<U> action;
5114	+	ForEachTransformedValueTask
5115	+	(ConcurrentHashMapV8<K,V> m,
5116	+	Fun<? super V, ? extends U> transformer,
5117	+	Action<U> action) {
5118	+	super(m);
5119	+	this.transformer = transformer;
5120	+	this.action = action;
5121	+
5122	+	}
5123	+	ForEachTransformedValueTask
5124	+	(BulkTask<K,V,?> p, int b, boolean split,
5125	+	Fun<? super V, ? extends U> transformer,
5126	+	Action<U> action) {
5127	+	super(p, b, split);
5128	+	this.transformer = transformer;
5129	+	this.action = action;
5130	+	}
5131	+	public final void compute() {
5132	+	final Fun<? super V, ? extends U> transformer =
5133	+	this.transformer;
5134	+	final Action<U> action = this.action;
5135	+	if (transformer == null || action == null)
5136	+	throw new Error(NullFunctionMessage);
5137	+	int b = batch(), c;
5138	+	while (b > 1 && baseIndex != baseLimit) {
5139	+	do {} while (!casPending(c = pending, c+1));
5140	+	new ForEachTransformedValueTask<K,V,U>
5141	+	(this, b >>>= 1, true, transformer, action).fork();
5142	+	}
5143	+	Object v; U u;
5144	+	while ((v = advance()) != null) {
5145	+	if ((u = transformer.apply((V)v)) != null)
5146	+	action.apply(u);
5147	+	}
5148	+	tryComplete();
5149	+	}
5150	+	}
5151	+
5152	+	static final class ForEachTransformedEntryTask<K,V,U>
5153	+	extends BulkTask<K,V,Void> {
5154	+	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5155	+	final Action<U> action;
5156	+	ForEachTransformedEntryTask
5157	+	(ConcurrentHashMapV8<K,V> m,
5158	+	Fun<Map.Entry<K,V>, ? extends U> transformer,
5159	+	Action<U> action) {
5160	+	super(m);
5161	+	this.transformer = transformer;
5162	+	this.action = action;
5163	+
5164	+	}
5165	+	ForEachTransformedEntryTask
5166	+	(BulkTask<K,V,?> p, int b, boolean split,
5167	+	Fun<Map.Entry<K,V>, ? extends U> transformer,
5168	+	Action<U> action) {
5169	+	super(p, b, split);
5170	+	this.transformer = transformer;
5171	+	this.action = action;
5172	+	}
5173	+	public final void compute() {
5174	+	final Fun<Map.Entry<K,V>, ? extends U> transformer =
5175	+	this.transformer;
5176	+	final Action<U> action = this.action;
5177	+	if (transformer == null || action == null)
5178	+	throw new Error(NullFunctionMessage);
5179	+	int b = batch(), c;
5180	+	while (b > 1 && baseIndex != baseLimit) {
5181	+	do {} while (!casPending(c = pending, c+1));
5182	+	new ForEachTransformedEntryTask<K,V,U>
5183	+	(this, b >>>= 1, true, transformer, action).fork();
5184	+	}
5185	+	Object v; U u;
5186	+	while ((v = advance()) != null) {
5187	+	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
5188	+	action.apply(u);
5189	+	}
5190	+	tryComplete();
5191	+	}
5192	+	}
5193	+
5194	+	static final class ForEachTransformedMappingTask<K,V,U>
5195	+	extends BulkTask<K,V,Void> {
5196	+	final BiFun<? super K, ? super V, ? extends U> transformer;
5197	+	final Action<U> action;
5198	+	ForEachTransformedMappingTask
5199	+	(ConcurrentHashMapV8<K,V> m,
5200	+	BiFun<? super K, ? super V, ? extends U> transformer,
5201	+	Action<U> action) {
5202	+	super(m);
5203	+	this.transformer = transformer;
5204	+	this.action = action;
5205	+
5206	+	}
5207	+	ForEachTransformedMappingTask
5208	+	(BulkTask<K,V,?> p, int b, boolean split,
5209	+	BiFun<? super K, ? super V, ? extends U> transformer,
5210	+	Action<U> action) {
5211	+	super(p, b, split);
5212	+	this.transformer = transformer;
5213	+	this.action = action;
5214	+	}
5215	+	public final void compute() {
5216	+	final BiFun<? super K, ? super V, ? extends U> transformer =
5217	+	this.transformer;
5218	+	final Action<U> action = this.action;
5219	+	if (transformer == null || action == null)
5220	+	throw new Error(NullFunctionMessage);
5221	+	int b = batch(), c;
5222	+	while (b > 1 && baseIndex != baseLimit) {
5223	+	do {} while (!casPending(c = pending, c+1));
5224	+	new ForEachTransformedMappingTask<K,V,U>
5225	+	(this, b >>>= 1, true, transformer, action).fork();
5226	+	}
5227	+	Object v; U u;
5228	+	while ((v = advance()) != null) {
5229	+	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
5230	+	action.apply(u);
5231	+	}
5232	+	tryComplete();
5233	+	}
5234	+	}
5235	+
5236	+	static final class SearchKeysTask<K,V,U>
5237	+	extends BulkTask<K,V,U> {
5238	+	final Fun<? super K, ? extends U> searchFunction;
5239	+	final AtomicReference<U> result;
5240	+	SearchKeysTask
5241	+	(ConcurrentHashMapV8<K,V> m,
5242	+	Fun<? super K, ? extends U> searchFunction,
5243	+	AtomicReference<U> result) {
5244	+	super(m);
5245	+	this.searchFunction = searchFunction; this.result = result;
5246	+	}
5247	+	SearchKeysTask
5248	+	(BulkTask<K,V,?> p, int b, boolean split,
5249	+	Fun<? super K, ? extends U> searchFunction,
5250	+	AtomicReference<U> result) {
5251	+	super(p, b, split);
5252	+	this.searchFunction = searchFunction; this.result = result;
5253	+	}
5254	+	public final void compute() {
5255	+	AtomicReference<U> result = this.result;
5256	+	final Fun<? super K, ? extends U> searchFunction =
5257	+	this.searchFunction;
5258	+	if (searchFunction == null || result == null)
5259	+	throw new Error(NullFunctionMessage);
5260	+	int b = batch(), c;
5261	+	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5262	+	do {} while (!casPending(c = pending, c+1));
5263	+	new SearchKeysTask<K,V,U>(this, b >>>= 1, true,
5264	+	searchFunction, result).fork();
5265	+	}
5266	+	U u;
5267	+	while (result.get() == null && advance() != null) {
5268	+	if ((u = searchFunction.apply((K)nextKey)) != null) {
5269	+	result.compareAndSet(null, u);
5270	+	break;
5271	+	}
5272	+	}
5273	+	tryComplete();
5274	+	}
5275	+	public final U getRawResult() { return result.get(); }
5276	+	}
5277	+
5278	+	static final class SearchValuesTask<K,V,U>
5279	+	extends BulkTask<K,V,U> {
5280	+	final Fun<? super V, ? extends U> searchFunction;
5281	+	final AtomicReference<U> result;
5282	+	SearchValuesTask
5283	+	(ConcurrentHashMapV8<K,V> m,
5284	+	Fun<? super V, ? extends U> searchFunction,
5285	+	AtomicReference<U> result) {
5286	+	super(m);
5287	+	this.searchFunction = searchFunction; this.result = result;
5288	+	}
5289	+	SearchValuesTask
5290	+	(BulkTask<K,V,?> p, int b, boolean split,
5291	+	Fun<? super V, ? extends U> searchFunction,
5292	+	AtomicReference<U> result) {
5293	+	super(p, b, split);
5294	+	this.searchFunction = searchFunction; this.result = result;
5295	+	}
5296	+	public final void compute() {
5297	+	AtomicReference<U> result = this.result;
5298	+	final Fun<? super V, ? extends U> searchFunction =
5299	+	this.searchFunction;
5300	+	if (searchFunction == null || result == null)
5301	+	throw new Error(NullFunctionMessage);
5302	+	int b = batch(), c;
5303	+	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5304	+	do {} while (!casPending(c = pending, c+1));
5305	+	new SearchValuesTask<K,V,U>(this, b >>>= 1, true,
5306	+	searchFunction, result).fork();
5307	+	}
5308	+	Object v; U u;
5309	+	while (result.get() == null && (v = advance()) != null) {
5310	+	if ((u = searchFunction.apply((V)v)) != null) {
5311	+	result.compareAndSet(null, u);
5312	+	break;
5313	+	}
5314	+	}
5315	+	tryComplete();
5316	+	}
5317	+	public final U getRawResult() { return result.get(); }
5318	+	}
5319	+
5320	+	static final class SearchEntriesTask<K,V,U>
5321	+	extends BulkTask<K,V,U> {
5322	+	final Fun<Entry<K,V>, ? extends U> searchFunction;
5323	+	final AtomicReference<U> result;
5324	+	SearchEntriesTask
5325	+	(ConcurrentHashMapV8<K,V> m,
5326	+	Fun<Entry<K,V>, ? extends U> searchFunction,
5327	+	AtomicReference<U> result) {
5328	+	super(m);
5329	+	this.searchFunction = searchFunction; this.result = result;
5330	+	}
5331	+	SearchEntriesTask
5332	+	(BulkTask<K,V,?> p, int b, boolean split,
5333	+	Fun<Entry<K,V>, ? extends U> searchFunction,
5334	+	AtomicReference<U> result) {
5335	+	super(p, b, split);
5336	+	this.searchFunction = searchFunction; this.result = result;
5337	+	}
5338	+	public final void compute() {
5339	+	AtomicReference<U> result = this.result;
5340	+	final Fun<Entry<K,V>, ? extends U> searchFunction =
5341	+	this.searchFunction;
5342	+	if (searchFunction == null || result == null)
5343	+	throw new Error(NullFunctionMessage);
5344	+	int b = batch(), c;
5345	+	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5346	+	do {} while (!casPending(c = pending, c+1));
5347	+	new SearchEntriesTask<K,V,U>(this, b >>>= 1, true,
5348	+	searchFunction, result).fork();
5349	+	}
5350	+	Object v; U u;
5351	+	while (result.get() == null && (v = advance()) != null) {
5352	+	if ((u = searchFunction.apply(entryFor((K)nextKey, (V)v))) != null) {
5353	+	result.compareAndSet(null, u);
5354	+	break;
5355	+	}
5356	+	}
5357	+	tryComplete();
5358	+	}
5359	+	public final U getRawResult() { return result.get(); }
5360	+	}
5361	+
5362	+	static final class SearchMappingsTask<K,V,U>
5363	+	extends BulkTask<K,V,U> {
5364	+	final BiFun<? super K, ? super V, ? extends U> searchFunction;
5365	+	final AtomicReference<U> result;
5366	+	SearchMappingsTask
5367	+	(ConcurrentHashMapV8<K,V> m,
5368	+	BiFun<? super K, ? super V, ? extends U> searchFunction,
5369	+	AtomicReference<U> result) {
5370	+	super(m);
5371	+	this.searchFunction = searchFunction; this.result = result;
5372	+	}
5373	+	SearchMappingsTask
5374	+	(BulkTask<K,V,?> p, int b, boolean split,
5375	+	BiFun<? super K, ? super V, ? extends U> searchFunction,
5376	+	AtomicReference<U> result) {
5377	+	super(p, b, split);
5378	+	this.searchFunction = searchFunction; this.result = result;
5379	+	}
5380	+	public final void compute() {
5381	+	AtomicReference<U> result = this.result;
5382	+	final BiFun<? super K, ? super V, ? extends U> searchFunction =
5383	+	this.searchFunction;
5384	+	if (searchFunction == null || result == null)
5385	+	throw new Error(NullFunctionMessage);
5386	+	int b = batch(), c;
5387	+	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5388	+	do {} while (!casPending(c = pending, c+1));
5389	+	new SearchMappingsTask<K,V,U>(this, b >>>= 1, true,
5390	+	searchFunction, result).fork();
5391	+	}
5392	+	Object v; U u;
5393	+	while (result.get() == null && (v = advance()) != null) {
5394	+	if ((u = searchFunction.apply((K)nextKey, (V)v)) != null) {
5395	+	result.compareAndSet(null, u);
5396	+	break;
5397	+	}
5398	+	}
5399	+	tryComplete();
5400	+	}
5401	+	public final U getRawResult() { return result.get(); }
5402	+	}
5403	+
5404	+	static final class ReduceKeysTask<K,V>
5405	+	extends BulkTask<K,V,K> {
5406	+	final BiFun<? super K, ? super K, ? extends K> reducer;
5407	+	K result;
5408	+	ReduceKeysTask<K,V> sibling;
5409	+	ReduceKeysTask
5410	+	(ConcurrentHashMapV8<K,V> m,
5411	+	BiFun<? super K, ? super K, ? extends K> reducer) {
5412	+	super(m);
5413	+	this.reducer = reducer;
5414	+	}
5415	+	ReduceKeysTask
5416	+	(BulkTask<K,V,?> p, int b, boolean split,
5417	+	BiFun<? super K, ? super K, ? extends K> reducer) {
5418	+	super(p, b, split);
5419	+	this.reducer = reducer;
5420	+	}
5421	+
5422	+	public final void compute() {
5423	+	ReduceKeysTask<K,V> t = this;
5424	+	final BiFun<? super K, ? super K, ? extends K> reducer =
5425	+	this.reducer;
5426	+	if (reducer == null)
5427	+	throw new Error(NullFunctionMessage);
5428	+	int b = batch();
5429	+	while (b > 1 && t.baseIndex != t.baseLimit) {
5430	+	b >>>= 1;
5431	+	t.pending = 1;
5432	+	ReduceKeysTask<K,V> rt =
5433	+	new ReduceKeysTask<K,V>
5434	+	(t, b, true, reducer);
5435	+	t = new ReduceKeysTask<K,V>
5436	+	(t, b, false, reducer);
5437	+	t.sibling = rt;
5438	+	rt.sibling = t;
5439	+	rt.fork();
5440	+	}
5441	+	K r = null;
5442	+	while (t.advance() != null) {
5443	+	K u = (K)t.nextKey;
5444	+	r = (r == null) ? u : reducer.apply(r, u);
5445	+	}
5446	+	t.result = r;
5447	+	for (;;) {
5448	+	int c; BulkTask<K,V,?> par; ReduceKeysTask<K,V> s, p; K u;
5449	+	if ((par = t.parent) == null ||
5450	+	!(par instanceof ReduceKeysTask)) {
5451	+	t.quietlyComplete();
5452	+	break;
5453	+	}
5454	+	else if ((c = (p = (ReduceKeysTask<K,V>)par).pending) == 0) {
5455	+	if ((s = t.sibling) != null && (u = s.result) != null)
5456	+	r = (r == null) ? u : reducer.apply(r, u);
5457	+	(t = p).result = r;
5458	+	}
5459	+	else if (p.casPending(c, 0))
5460	+	break;
5461	+	}
5462	+	}
5463	+	public final K getRawResult() { return result; }
5464	+	}
5465	+
5466	+	static final class ReduceValuesTask<K,V>
5467	+	extends BulkTask<K,V,V> {
5468	+	final BiFun<? super V, ? super V, ? extends V> reducer;
5469	+	V result;
5470	+	ReduceValuesTask<K,V> sibling;
5471	+	ReduceValuesTask
5472	+	(ConcurrentHashMapV8<K,V> m,
5473	+	BiFun<? super V, ? super V, ? extends V> reducer) {
5474	+	super(m);
5475	+	this.reducer = reducer;
5476	+	}
5477	+	ReduceValuesTask
5478	+	(BulkTask<K,V,?> p, int b, boolean split,
5479	+	BiFun<? super V, ? super V, ? extends V> reducer) {
5480	+	super(p, b, split);
5481	+	this.reducer = reducer;
5482	+	}
5483	+
5484	+	public final void compute() {
5485	+	ReduceValuesTask<K,V> t = this;
5486	+	final BiFun<? super V, ? super V, ? extends V> reducer =
5487	+	this.reducer;
5488	+	if (reducer == null)
5489	+	throw new Error(NullFunctionMessage);
5490	+	int b = batch();
5491	+	while (b > 1 && t.baseIndex != t.baseLimit) {
5492	+	b >>>= 1;
5493	+	t.pending = 1;
5494	+	ReduceValuesTask<K,V> rt =
5495	+	new ReduceValuesTask<K,V>
5496	+	(t, b, true, reducer);
5497	+	t = new ReduceValuesTask<K,V>
5498	+	(t, b, false, reducer);
5499	+	t.sibling = rt;
5500	+	rt.sibling = t;
5501	+	rt.fork();
5502	+	}
5503	+	V r = null;
5504	+	Object v;
5505	+	while ((v = t.advance()) != null) {
5506	+	V u = (V)v;
5507	+	r = (r == null) ? u : reducer.apply(r, u);
5508	+	}
5509	+	t.result = r;
5510	+	for (;;) {
5511	+	int c; BulkTask<K,V,?> par; ReduceValuesTask<K,V> s, p; V u;
5512	+	if ((par = t.parent) == null ||
5513	+	!(par instanceof ReduceValuesTask)) {
5514	+	t.quietlyComplete();
5515	+	break;
5516	+	}
5517	+	else if ((c = (p = (ReduceValuesTask<K,V>)par).pending) == 0) {
5518	+	if ((s = t.sibling) != null && (u = s.result) != null)
5519	+	r = (r == null) ? u : reducer.apply(r, u);
5520	+	(t = p).result = r;
5521	+	}
5522	+	else if (p.casPending(c, 0))
5523	+	break;
5524	+	}
5525	+	}
5526	+	public final V getRawResult() { return result; }
5527	+	}
5528	+
5529	+	static final class ReduceEntriesTask<K,V>
5530	+	extends BulkTask<K,V,Map.Entry<K,V>> {
5531	+	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5532	+	Map.Entry<K,V> result;
5533	+	ReduceEntriesTask<K,V> sibling;
5534	+	ReduceEntriesTask
5535	+	(ConcurrentHashMapV8<K,V> m,
5536	+	BiFun<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5537	+	super(m);
5538	+	this.reducer = reducer;
5539	+	}
5540	+	ReduceEntriesTask
5541	+	(BulkTask<K,V,?> p, int b, boolean split,
5542	+	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5543	+	super(p, b, split);
5544	+	this.reducer = reducer;
5545	+	}
5546	+
5547	+	public final void compute() {
5548	+	ReduceEntriesTask<K,V> t = this;
5549	+	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer =
5550	+	this.reducer;
5551	+	if (reducer == null)
5552	+	throw new Error(NullFunctionMessage);
5553	+	int b = batch();
5554	+	while (b > 1 && t.baseIndex != t.baseLimit) {
5555	+	b >>>= 1;
5556	+	t.pending = 1;
5557	+	ReduceEntriesTask<K,V> rt =
5558	+	new ReduceEntriesTask<K,V>
5559	+	(t, b, true, reducer);
5560	+	t = new ReduceEntriesTask<K,V>
5561	+	(t, b, false, reducer);
5562	+	t.sibling = rt;
5563	+	rt.sibling = t;
5564	+	rt.fork();
5565	+	}
5566	+	Map.Entry<K,V> r = null;
5567	+	Object v;
5568	+	while ((v = t.advance()) != null) {
5569	+	Map.Entry<K,V> u = entryFor((K)t.nextKey, (V)v);
5570	+	r = (r == null) ? u : reducer.apply(r, u);
5571	+	}
5572	+	t.result = r;
5573	+	for (;;) {
5574	+	int c; BulkTask<K,V,?> par; ReduceEntriesTask<K,V> s, p;
5575	+	Map.Entry<K,V> u;
5576	+	if ((par = t.parent) == null ||
5577	+	!(par instanceof ReduceEntriesTask)) {
5578	+	t.quietlyComplete();
5579	+	break;
5580	+	}
5581	+	else if ((c = (p = (ReduceEntriesTask<K,V>)par).pending) == 0) {
5582	+	if ((s = t.sibling) != null && (u = s.result) != null)
5583	+	r = (r == null) ? u : reducer.apply(r, u);
5584	+	(t = p).result = r;
5585	+	}
5586	+	else if (p.casPending(c, 0))
5587	+	break;
5588	+	}
5589	+	}
5590	+	public final Map.Entry<K,V> getRawResult() { return result; }
5591	+	}
5592	+
5593	+	static final class MapReduceKeysTask<K,V,U>
5594	+	extends BulkTask<K,V,U> {
5595	+	final Fun<? super K, ? extends U> transformer;
5596	+	final BiFun<? super U, ? super U, ? extends U> reducer;
5597	+	U result;
5598	+	MapReduceKeysTask<K,V,U> sibling;
5599	+	MapReduceKeysTask
5600	+	(ConcurrentHashMapV8<K,V> m,
5601	+	Fun<? super K, ? extends U> transformer,
5602	+	BiFun<? super U, ? super U, ? extends U> reducer) {
5603	+	super(m);
5604	+	this.transformer = transformer;
5605	+	this.reducer = reducer;
5606	+	}
5607	+	MapReduceKeysTask
5608	+	(BulkTask<K,V,?> p, int b, boolean split,
5609	+	Fun<? super K, ? extends U> transformer,
5610	+	BiFun<? super U, ? super U, ? extends U> reducer) {
5611	+	super(p, b, split);
5612	+	this.transformer = transformer;
5613	+	this.reducer = reducer;
5614	+	}
5615	+	public final void compute() {
5616	+	MapReduceKeysTask<K,V,U> t = this;
5617	+	final Fun<? super K, ? extends U> transformer =
5618	+	this.transformer;
5619	+	final BiFun<? super U, ? super U, ? extends U> reducer =
5620	+	this.reducer;
5621	+	if (transformer == null || reducer == null)
5622	+	throw new Error(NullFunctionMessage);
5623	+	int b = batch();
5624	+	while (b > 1 && t.baseIndex != t.baseLimit) {
5625	+	b >>>= 1;
5626	+	t.pending = 1;
5627	+	MapReduceKeysTask<K,V,U> rt =
5628	+	new MapReduceKeysTask<K,V,U>
5629	+	(t, b, true, transformer, reducer);
5630	+	t = new MapReduceKeysTask<K,V,U>
5631	+	(t, b, false, transformer, reducer);
5632	+	t.sibling = rt;
5633	+	rt.sibling = t;
5634	+	rt.fork();
5635	+	}
5636	+	U r = null, u;
5637	+	while (t.advance() != null) {
5638	+	if ((u = transformer.apply((K)t.nextKey)) != null)
5639	+	r = (r == null) ? u : reducer.apply(r, u);
5640	+	}
5641	+	t.result = r;
5642	+	for (;;) {
5643	+	int c; BulkTask<K,V,?> par; MapReduceKeysTask<K,V,U> s, p;
5644	+	if ((par = t.parent) == null ||
5645	+	!(par instanceof MapReduceKeysTask)) {
5646	+	t.quietlyComplete();
5647	+	break;
5648	+	}
5649	+	else if ((c = (p = (MapReduceKeysTask<K,V,U>)par).pending) == 0) {
5650	+	if ((s = t.sibling) != null && (u = s.result) != null)
5651	+	r = (r == null) ? u : reducer.apply(r, u);
5652	+	(t = p).result = r;
5653	+	}
5654	+	else if (p.casPending(c, 0))
5655	+	break;
5656	+	}
5657	+	}
5658	+	public final U getRawResult() { return result; }
5659	+	}
5660	+
5661	+	static final class MapReduceValuesTask<K,V,U>
5662	+	extends BulkTask<K,V,U> {
5663	+	final Fun<? super V, ? extends U> transformer;
5664	+	final BiFun<? super U, ? super U, ? extends U> reducer;
5665	+	U result;
5666	+	MapReduceValuesTask<K,V,U> sibling;
5667	+	MapReduceValuesTask
5668	+	(ConcurrentHashMapV8<K,V> m,
5669	+	Fun<? super V, ? extends U> transformer,
5670	+	BiFun<? super U, ? super U, ? extends U> reducer) {
5671	+	super(m);
5672	+	this.transformer = transformer;
5673	+	this.reducer = reducer;
5674	+	}
5675	+	MapReduceValuesTask
5676	+	(BulkTask<K,V,?> p, int b, boolean split,
5677	+	Fun<? super V, ? extends U> transformer,
5678	+	BiFun<? super U, ? super U, ? extends U> reducer) {
5679	+	super(p, b, split);
5680	+	this.transformer = transformer;
5681	+	this.reducer = reducer;
5682	+	}
5683	+	public final void compute() {
5684	+	MapReduceValuesTask<K,V,U> t = this;
5685	+	final Fun<? super V, ? extends U> transformer =
5686	+	this.transformer;
5687	+	final BiFun<? super U, ? super U, ? extends U> reducer =
5688	+	this.reducer;
5689	+	if (transformer == null || reducer == null)
5690	+	throw new Error(NullFunctionMessage);
5691	+	int b = batch();
5692	+	while (b > 1 && t.baseIndex != t.baseLimit) {
5693	+	b >>>= 1;
5694	+	t.pending = 1;
5695	+	MapReduceValuesTask<K,V,U> rt =
5696	+	new MapReduceValuesTask<K,V,U>
5697	+	(t, b, true, transformer, reducer);
5698	+	t = new MapReduceValuesTask<K,V,U>
5699	+	(t, b, false, transformer, reducer);
5700	+	t.sibling = rt;
5701	+	rt.sibling = t;
5702	+	rt.fork();
5703	+	}
5704	+	U r = null, u;
5705	+	Object v;
5706	+	while ((v = t.advance()) != null) {
5707	+	if ((u = transformer.apply((V)v)) != null)
5708	+	r = (r == null) ? u : reducer.apply(r, u);
5709	+	}
5710	+	t.result = r;
5711	+	for (;;) {
5712	+	int c; BulkTask<K,V,?> par; MapReduceValuesTask<K,V,U> s, p;
5713	+	if ((par = t.parent) == null ||
5714	+	!(par instanceof MapReduceValuesTask)) {
5715	+	t.quietlyComplete();
5716	+	break;
5717	+	}
5718	+	else if ((c = (p = (MapReduceValuesTask<K,V,U>)par).pending) == 0) {
5719	+	if ((s = t.sibling) != null && (u = s.result) != null)
5720	+	r = (r == null) ? u : reducer.apply(r, u);
5721	+	(t = p).result = r;
5722	+	}
5723	+	else if (p.casPending(c, 0))
5724	+	break;
5725	+	}
5726	+	}
5727	+	public final U getRawResult() { return result; }
5728	+	}
5729	+
5730	+	static final class MapReduceEntriesTask<K,V,U>
5731	+	extends BulkTask<K,V,U> {
5732	+	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5733	+	final BiFun<? super U, ? super U, ? extends U> reducer;
5734	+	U result;
5735	+	MapReduceEntriesTask<K,V,U> sibling;
5736	+	MapReduceEntriesTask
5737	+	(ConcurrentHashMapV8<K,V> m,
5738	+	Fun<Map.Entry<K,V>, ? extends U> transformer,
5739	+	BiFun<? super U, ? super U, ? extends U> reducer) {
5740	+	super(m);
5741	+	this.transformer = transformer;
5742	+	this.reducer = reducer;
5743	+	}
5744	+	MapReduceEntriesTask
5745	+	(BulkTask<K,V,?> p, int b, boolean split,
5746	+	Fun<Map.Entry<K,V>, ? extends U> transformer,
5747	+	BiFun<? super U, ? super U, ? extends U> reducer) {
5748	+	super(p, b, split);
5749	+	this.transformer = transformer;
5750	+	this.reducer = reducer;
5751	+	}
5752	+	public final void compute() {
5753	+	MapReduceEntriesTask<K,V,U> t = this;
5754	+	final Fun<Map.Entry<K,V>, ? extends U> transformer =
5755	+	this.transformer;
5756	+	final BiFun<? super U, ? super U, ? extends U> reducer =
5757	+	this.reducer;
5758	+	if (transformer == null || reducer == null)
5759	+	throw new Error(NullFunctionMessage);
5760	+	int b = batch();
5761	+	while (b > 1 && t.baseIndex != t.baseLimit) {
5762	+	b >>>= 1;
5763	+	t.pending = 1;
5764	+	MapReduceEntriesTask<K,V,U> rt =
5765	+	new MapReduceEntriesTask<K,V,U>
5766	+	(t, b, true, transformer, reducer);
5767	+	t = new MapReduceEntriesTask<K,V,U>
5768	+	(t, b, false, transformer, reducer);
5769	+	t.sibling = rt;
5770	+	rt.sibling = t;
5771	+	rt.fork();
5772	+	}
5773	+	U r = null, u;
5774	+	Object v;
5775	+	while ((v = t.advance()) != null) {
5776	+	if ((u = transformer.apply(entryFor((K)t.nextKey, (V)v))) != null)
5777	+	r = (r == null) ? u : reducer.apply(r, u);
5778	+	}
5779	+	t.result = r;
5780	+	for (;;) {
5781	+	int c; BulkTask<K,V,?> par; MapReduceEntriesTask<K,V,U> s, p;
5782	+	if ((par = t.parent) == null ||
5783	+	!(par instanceof MapReduceEntriesTask)) {
5784	+	t.quietlyComplete();
5785	+	break;
5786	+	}
5787	+	else if ((c = (p = (MapReduceEntriesTask<K,V,U>)par).pending) == 0) {
5788	+	if ((s = t.sibling) != null && (u = s.result) != null)
5789	+	r = (r == null) ? u : reducer.apply(r, u);
5790	+	(t = p).result = r;
5791	+	}
5792	+	else if (p.casPending(c, 0))
5793	+	break;
5794	+	}
5795	+	}
5796	+	public final U getRawResult() { return result; }
5797	+	}
5798	+
5799	+	static final class MapReduceMappingsTask<K,V,U>
5800	+	extends BulkTask<K,V,U> {
5801	+	final BiFun<? super K, ? super V, ? extends U> transformer;
5802	+	final BiFun<? super U, ? super U, ? extends U> reducer;
5803	+	U result;
5804	+	MapReduceMappingsTask<K,V,U> sibling;
5805	+	MapReduceMappingsTask
5806	+	(ConcurrentHashMapV8<K,V> m,
5807	+	BiFun<? super K, ? super V, ? extends U> transformer,
5808	+	BiFun<? super U, ? super U, ? extends U> reducer) {
5809	+	super(m);
5810	+	this.transformer = transformer;
5811	+	this.reducer = reducer;
5812	+	}
5813	+	MapReduceMappingsTask
5814	+	(BulkTask<K,V,?> p, int b, boolean split,
5815	+	BiFun<? super K, ? super V, ? extends U> transformer,
5816	+	BiFun<? super U, ? super U, ? extends U> reducer) {
5817	+	super(p, b, split);
5818	+	this.transformer = transformer;
5819	+	this.reducer = reducer;
5820	+	}
5821	+	public final void compute() {
5822	+	MapReduceMappingsTask<K,V,U> t = this;
5823	+	final BiFun<? super K, ? super V, ? extends U> transformer =
5824	+	this.transformer;
5825	+	final BiFun<? super U, ? super U, ? extends U> reducer =
5826	+	this.reducer;
5827	+	if (transformer == null || reducer == null)
5828	+	throw new Error(NullFunctionMessage);
5829	+	int b = batch();
5830	+	while (b > 1 && t.baseIndex != t.baseLimit) {
5831	+	b >>>= 1;
5832	+	t.pending = 1;
5833	+	MapReduceMappingsTask<K,V,U> rt =
5834	+	new MapReduceMappingsTask<K,V,U>
5835	+	(t, b, true, transformer, reducer);
5836	+	t = new MapReduceMappingsTask<K,V,U>
5837	+	(t, b, false, transformer, reducer);
5838	+	t.sibling = rt;
5839	+	rt.sibling = t;
5840	+	rt.fork();
5841	+	}
5842	+	U r = null, u;
5843	+	Object v;
5844	+	while ((v = t.advance()) != null) {
5845	+	if ((u = transformer.apply((K)t.nextKey, (V)v)) != null)
5846	+	r = (r == null) ? u : reducer.apply(r, u);
5847	+	}
5848	+	for (;;) {
5849	+	int c; BulkTask<K,V,?> par; MapReduceMappingsTask<K,V,U> s, p;
5850	+	if ((par = t.parent) == null ||
5851	+	!(par instanceof MapReduceMappingsTask)) {
5852	+	t.quietlyComplete();
5853	+	break;
5854	+	}
5855	+	else if ((c = (p = (MapReduceMappingsTask<K,V,U>)par).pending) == 0) {
5856	+	if ((s = t.sibling) != null && (u = s.result) != null)
5857	+	r = (r == null) ? u : reducer.apply(r, u);
5858	+	(t = p).result = r;
5859	+	}
5860	+	else if (p.casPending(c, 0))
5861	+	break;
5862	+	}
5863	+	}
5864	+	public final U getRawResult() { return result; }
5865	+	}
5866	+
5867	+	static final class MapReduceKeysToDoubleTask<K,V>
5868	+	extends BulkTask<K,V,Double> {
5869	+	final ObjectToDouble<? super K> transformer;
5870	+	final DoubleByDoubleToDouble reducer;
5871	+	final double basis;
5872	+	double result;
5873	+	MapReduceKeysToDoubleTask<K,V> sibling;
5874	+	MapReduceKeysToDoubleTask
5875	+	(ConcurrentHashMapV8<K,V> m,
5876	+	ObjectToDouble<? super K> transformer,
5877	+	double basis,
5878	+	DoubleByDoubleToDouble reducer) {
5879	+	super(m);
5880	+	this.transformer = transformer;
5881	+	this.basis = basis; this.reducer = reducer;
5882	+	}
5883	+	MapReduceKeysToDoubleTask
5884	+	(BulkTask<K,V,?> p, int b, boolean split,
5885	+	ObjectToDouble<? super K> transformer,
5886	+	double basis,
5887	+	DoubleByDoubleToDouble reducer) {
5888	+	super(p, b, split);
5889	+	this.transformer = transformer;
5890	+	this.basis = basis; this.reducer = reducer;
5891	+	}
5892	+	public final void compute() {
5893	+	MapReduceKeysToDoubleTask<K,V> t = this;
5894	+	final ObjectToDouble<? super K> transformer =
5895	+	this.transformer;
5896	+	final DoubleByDoubleToDouble reducer = this.reducer;
5897	+	if (transformer == null || reducer == null)
5898	+	throw new Error(NullFunctionMessage);
5899	+	final double id = this.basis;
5900	+	int b = batch();
5901	+	while (b > 1 && t.baseIndex != t.baseLimit) {
5902	+	b >>>= 1;
5903	+	t.pending = 1;
5904	+	MapReduceKeysToDoubleTask<K,V> rt =
5905	+	new MapReduceKeysToDoubleTask<K,V>
5906	+	(t, b, true, transformer, id, reducer);
5907	+	t = new MapReduceKeysToDoubleTask<K,V>
5908	+	(t, b, false, transformer, id, reducer);
5909	+	t.sibling = rt;
5910	+	rt.sibling = t;
5911	+	rt.fork();
5912	+	}
5913	+	double r = id;
5914	+	while (t.advance() != null)
5915	+	r = reducer.apply(r, transformer.apply((K)t.nextKey));
5916	+	t.result = r;
5917	+	for (;;) {
5918	+	int c; BulkTask<K,V,?> par; MapReduceKeysToDoubleTask<K,V> s, p;
5919	+	if ((par = t.parent) == null ||
5920	+	!(par instanceof MapReduceKeysToDoubleTask)) {
5921	+	t.quietlyComplete();
5922	+	break;
5923	+	}
5924	+	else if ((c = (p = (MapReduceKeysToDoubleTask<K,V>)par).pending) == 0) {
5925	+	if ((s = t.sibling) != null)
5926	+	r = reducer.apply(r, s.result);
5927	+	(t = p).result = r;
5928	+	}
5929	+	else if (p.casPending(c, 0))
5930	+	break;
5931	+	}
5932	+	}
5933	+	public final Double getRawResult() { return result; }
5934	+	}
5935	+
5936	+	static final class MapReduceValuesToDoubleTask<K,V>
5937	+	extends BulkTask<K,V,Double> {
5938	+	final ObjectToDouble<? super V> transformer;
5939	+	final DoubleByDoubleToDouble reducer;
5940	+	final double basis;
5941	+	double result;
5942	+	MapReduceValuesToDoubleTask<K,V> sibling;
5943	+	MapReduceValuesToDoubleTask
5944	+	(ConcurrentHashMapV8<K,V> m,
5945	+	ObjectToDouble<? super V> transformer,
5946	+	double basis,
5947	+	DoubleByDoubleToDouble reducer) {
5948	+	super(m);
5949	+	this.transformer = transformer;
5950	+	this.basis = basis; this.reducer = reducer;
5951	+	}
5952	+	MapReduceValuesToDoubleTask
5953	+	(BulkTask<K,V,?> p, int b, boolean split,
5954	+	ObjectToDouble<? super V> transformer,
5955	+	double basis,
5956	+	DoubleByDoubleToDouble reducer) {
5957	+	super(p, b, split);
5958	+	this.transformer = transformer;
5959	+	this.basis = basis; this.reducer = reducer;
5960	+	}
5961	+	public final void compute() {
5962	+	MapReduceValuesToDoubleTask<K,V> t = this;
5963	+	final ObjectToDouble<? super V> transformer =
5964	+	this.transformer;
5965	+	final DoubleByDoubleToDouble reducer = this.reducer;
5966	+	if (transformer == null || reducer == null)
5967	+	throw new Error(NullFunctionMessage);
5968	+	final double id = this.basis;
5969	+	int b = batch();
5970	+	while (b > 1 && t.baseIndex != t.baseLimit) {
5971	+	b >>>= 1;
5972	+	t.pending = 1;
5973	+	MapReduceValuesToDoubleTask<K,V> rt =
5974	+	new MapReduceValuesToDoubleTask<K,V>
5975	+	(t, b, true, transformer, id, reducer);
5976	+	t = new MapReduceValuesToDoubleTask<K,V>
5977	+	(t, b, false, transformer, id, reducer);
5978	+	t.sibling = rt;
5979	+	rt.sibling = t;
5980	+	rt.fork();
5981	+	}
5982	+	double r = id;
5983	+	Object v;
5984	+	while ((v = t.advance()) != null)
5985	+	r = reducer.apply(r, transformer.apply((V)v));
5986	+	t.result = r;
5987	+	for (;;) {
5988	+	int c; BulkTask<K,V,?> par; MapReduceValuesToDoubleTask<K,V> s, p;
5989	+	if ((par = t.parent) == null ||
5990	+	!(par instanceof MapReduceValuesToDoubleTask)) {
5991	+	t.quietlyComplete();
5992	+	break;
5993	+	}
5994	+	else if ((c = (p = (MapReduceValuesToDoubleTask<K,V>)par).pending) == 0) {
5995	+	if ((s = t.sibling) != null)
5996	+	r = reducer.apply(r, s.result);
5997	+	(t = p).result = r;
5998	+	}
5999	+	else if (p.casPending(c, 0))
6000	+	break;
6001	+	}
6002	+	}
6003	+	public final Double getRawResult() { return result; }
6004	+	}
6005	+
6006	+	static final class MapReduceEntriesToDoubleTask<K,V>
6007	+	extends BulkTask<K,V,Double> {
6008	+	final ObjectToDouble<Map.Entry<K,V>> transformer;
6009	+	final DoubleByDoubleToDouble reducer;
6010	+	final double basis;
6011	+	double result;
6012	+	MapReduceEntriesToDoubleTask<K,V> sibling;
6013	+	MapReduceEntriesToDoubleTask
6014	+	(ConcurrentHashMapV8<K,V> m,
6015	+	ObjectToDouble<Map.Entry<K,V>> transformer,
6016	+	double basis,
6017	+	DoubleByDoubleToDouble reducer) {
6018	+	super(m);
6019	+	this.transformer = transformer;
6020	+	this.basis = basis; this.reducer = reducer;
6021	+	}
6022	+	MapReduceEntriesToDoubleTask
6023	+	(BulkTask<K,V,?> p, int b, boolean split,
6024	+	ObjectToDouble<Map.Entry<K,V>> transformer,
6025	+	double basis,
6026	+	DoubleByDoubleToDouble reducer) {
6027	+	super(p, b, split);
6028	+	this.transformer = transformer;
6029	+	this.basis = basis; this.reducer = reducer;
6030	+	}
6031	+	public final void compute() {
6032	+	MapReduceEntriesToDoubleTask<K,V> t = this;
6033	+	final ObjectToDouble<Map.Entry<K,V>> transformer =
6034	+	this.transformer;
6035	+	final DoubleByDoubleToDouble reducer = this.reducer;
6036	+	if (transformer == null || reducer == null)
6037	+	throw new Error(NullFunctionMessage);
6038	+	final double id = this.basis;
6039	+	int b = batch();
6040	+	while (b > 1 && t.baseIndex != t.baseLimit) {
6041	+	b >>>= 1;
6042	+	t.pending = 1;
6043	+	MapReduceEntriesToDoubleTask<K,V> rt =
6044	+	new MapReduceEntriesToDoubleTask<K,V>
6045	+	(t, b, true, transformer, id, reducer);
6046	+	t = new MapReduceEntriesToDoubleTask<K,V>
6047	+	(t, b, false, transformer, id, reducer);
6048	+	t.sibling = rt;
6049	+	rt.sibling = t;
6050	+	rt.fork();
6051	+	}
6052	+	double r = id;
6053	+	Object v;
6054	+	while ((v = t.advance()) != null)
6055	+	r = reducer.apply(r, transformer.apply(entryFor((K)t.nextKey, (V)v)));
6056	+	t.result = r;
6057	+	for (;;) {
6058	+	int c; BulkTask<K,V,?> par; MapReduceEntriesToDoubleTask<K,V> s, p;
6059	+	if ((par = t.parent) == null ||
6060	+	!(par instanceof MapReduceEntriesToDoubleTask)) {
6061	+	t.quietlyComplete();
6062	+	break;
6063	+	}
6064	+	else if ((c = (p = (MapReduceEntriesToDoubleTask<K,V>)par).pending) == 0) {
6065	+	if ((s = t.sibling) != null)
6066	+	r = reducer.apply(r, s.result);
6067	+	(t = p).result = r;
6068	+	}
6069	+	else if (p.casPending(c, 0))
6070	+	break;
6071	+	}
6072	+	}
6073	+	public final Double getRawResult() { return result; }
6074	+	}
6075	+
6076	+	static final class MapReduceMappingsToDoubleTask<K,V>
6077	+	extends BulkTask<K,V,Double> {
6078	+	final ObjectByObjectToDouble<? super K, ? super V> transformer;
6079	+	final DoubleByDoubleToDouble reducer;
6080	+	final double basis;
6081	+	double result;
6082	+	MapReduceMappingsToDoubleTask<K,V> sibling;
6083	+	MapReduceMappingsToDoubleTask
6084	+	(ConcurrentHashMapV8<K,V> m,
6085	+	ObjectByObjectToDouble<? super K, ? super V> transformer,
6086	+	double basis,
6087	+	DoubleByDoubleToDouble reducer) {
6088	+	super(m);
6089	+	this.transformer = transformer;
6090	+	this.basis = basis; this.reducer = reducer;
6091	+	}
6092	+	MapReduceMappingsToDoubleTask
6093	+	(BulkTask<K,V,?> p, int b, boolean split,
6094	+	ObjectByObjectToDouble<? super K, ? super V> transformer,
6095	+	double basis,
6096	+	DoubleByDoubleToDouble reducer) {
6097	+	super(p, b, split);
6098	+	this.transformer = transformer;
6099	+	this.basis = basis; this.reducer = reducer;
6100	+	}
6101	+	public final void compute() {
6102	+	MapReduceMappingsToDoubleTask<K,V> t = this;
6103	+	final ObjectByObjectToDouble<? super K, ? super V> transformer =
6104	+	this.transformer;
6105	+	final DoubleByDoubleToDouble reducer = this.reducer;
6106	+	if (transformer == null || reducer == null)
6107	+	throw new Error(NullFunctionMessage);
6108	+	final double id = this.basis;
6109	+	int b = batch();
6110	+	while (b > 1 && t.baseIndex != t.baseLimit) {
6111	+	b >>>= 1;
6112	+	t.pending = 1;
6113	+	MapReduceMappingsToDoubleTask<K,V> rt =
6114	+	new MapReduceMappingsToDoubleTask<K,V>
6115	+	(t, b, true, transformer, id, reducer);
6116	+	t = new MapReduceMappingsToDoubleTask<K,V>
6117	+	(t, b, false, transformer, id, reducer);
6118	+	t.sibling = rt;
6119	+	rt.sibling = t;
6120	+	rt.fork();
6121	+	}
6122	+	double r = id;
6123	+	Object v;
6124	+	while ((v = t.advance()) != null)
6125	+	r = reducer.apply(r, transformer.apply((K)t.nextKey, (V)v));
6126	+	t.result = r;
6127	+	for (;;) {
6128	+	int c; BulkTask<K,V,?> par; MapReduceMappingsToDoubleTask<K,V> s, p;
6129	+	if ((par = t.parent) == null ||
6130	+	!(par instanceof MapReduceMappingsToDoubleTask)) {
6131	+	t.quietlyComplete();
6132	+	break;
6133	+	}
6134	+	else if ((c = (p = (MapReduceMappingsToDoubleTask<K,V>)par).pending) == 0) {
6135	+	if ((s = t.sibling) != null)
6136	+	r = reducer.apply(r, s.result);
6137	+	(t = p).result = r;
6138	+	}
6139	+	else if (p.casPending(c, 0))
6140	+	break;
6141	+	}
6142	+	}
6143	+	public final Double getRawResult() { return result; }
6144	+	}
6145	+
6146	+	static final class MapReduceKeysToLongTask<K,V>
6147	+	extends BulkTask<K,V,Long> {
6148	+	final ObjectToLong<? super K> transformer;
6149	+	final LongByLongToLong reducer;
6150	+	final long basis;
6151	+	long result;
6152	+	MapReduceKeysToLongTask<K,V> sibling;
6153	+	MapReduceKeysToLongTask
6154	+	(ConcurrentHashMapV8<K,V> m,
6155	+	ObjectToLong<? super K> transformer,
6156	+	long basis,
6157	+	LongByLongToLong reducer) {
6158	+	super(m);
6159	+	this.transformer = transformer;
6160	+	this.basis = basis; this.reducer = reducer;
6161	+	}
6162	+	MapReduceKeysToLongTask
6163	+	(BulkTask<K,V,?> p, int b, boolean split,
6164	+	ObjectToLong<? super K> transformer,
6165	+	long basis,
6166	+	LongByLongToLong reducer) {
6167	+	super(p, b, split);
6168	+	this.transformer = transformer;
6169	+	this.basis = basis; this.reducer = reducer;
6170	+	}
6171	+	public final void compute() {
6172	+	MapReduceKeysToLongTask<K,V> t = this;
6173	+	final ObjectToLong<? super K> transformer =
6174	+	this.transformer;
6175	+	final LongByLongToLong reducer = this.reducer;
6176	+	if (transformer == null || reducer == null)
6177	+	throw new Error(NullFunctionMessage);
6178	+	final long id = this.basis;
6179	+	int b = batch();
6180	+	while (b > 1 && t.baseIndex != t.baseLimit) {
6181	+	b >>>= 1;
6182	+	t.pending = 1;
6183	+	MapReduceKeysToLongTask<K,V> rt =
6184	+	new MapReduceKeysToLongTask<K,V>
6185	+	(t, b, true, transformer, id, reducer);
6186	+	t = new MapReduceKeysToLongTask<K,V>
6187	+	(t, b, false, transformer, id, reducer);
6188	+	t.sibling = rt;
6189	+	rt.sibling = t;
6190	+	rt.fork();
6191	+	}
6192	+	long r = id;
6193	+	while (t.advance() != null)
6194	+	r = reducer.apply(r, transformer.apply((K)t.nextKey));
6195	+	t.result = r;
6196	+	for (;;) {
6197	+	int c; BulkTask<K,V,?> par; MapReduceKeysToLongTask<K,V> s, p;
6198	+	if ((par = t.parent) == null ||
6199	+	!(par instanceof MapReduceKeysToLongTask)) {
6200	+	t.quietlyComplete();
6201	+	break;
6202	+	}
6203	+	else if ((c = (p = (MapReduceKeysToLongTask<K,V>)par).pending) == 0) {
6204	+	if ((s = t.sibling) != null)
6205	+	r = reducer.apply(r, s.result);
6206	+	(t = p).result = r;
6207	+	}
6208	+	else if (p.casPending(c, 0))
6209	+	break;
6210	+	}
6211	+	}
6212	+	public final Long getRawResult() { return result; }
6213	+	}
6214	+
6215	+	static final class MapReduceValuesToLongTask<K,V>
6216	+	extends BulkTask<K,V,Long> {
6217	+	final ObjectToLong<? super V> transformer;
6218	+	final LongByLongToLong reducer;
6219	+	final long basis;
6220	+	long result;
6221	+	MapReduceValuesToLongTask<K,V> sibling;
6222	+	MapReduceValuesToLongTask
6223	+	(ConcurrentHashMapV8<K,V> m,
6224	+	ObjectToLong<? super V> transformer,
6225	+	long basis,
6226	+	LongByLongToLong reducer) {
6227	+	super(m);
6228	+	this.transformer = transformer;
6229	+	this.basis = basis; this.reducer = reducer;
6230	+	}
6231	+	MapReduceValuesToLongTask
6232	+	(BulkTask<K,V,?> p, int b, boolean split,
6233	+	ObjectToLong<? super V> transformer,
6234	+	long basis,
6235	+	LongByLongToLong reducer) {
6236	+	super(p, b, split);
6237	+	this.transformer = transformer;
6238	+	this.basis = basis; this.reducer = reducer;
6239	+	}
6240	+	public final void compute() {
6241	+	MapReduceValuesToLongTask<K,V> t = this;
6242	+	final ObjectToLong<? super V> transformer =
6243	+	this.transformer;
6244	+	final LongByLongToLong reducer = this.reducer;
6245	+	if (transformer == null || reducer == null)
6246	+	throw new Error(NullFunctionMessage);
6247	+	final long id = this.basis;
6248	+	int b = batch();
6249	+	while (b > 1 && t.baseIndex != t.baseLimit) {
6250	+	b >>>= 1;
6251	+	t.pending = 1;
6252	+	MapReduceValuesToLongTask<K,V> rt =
6253	+	new MapReduceValuesToLongTask<K,V>
6254	+	(t, b, true, transformer, id, reducer);
6255	+	t = new MapReduceValuesToLongTask<K,V>
6256	+	(t, b, false, transformer, id, reducer);
6257	+	t.sibling = rt;
6258	+	rt.sibling = t;
6259	+	rt.fork();
6260	+	}
6261	+	long r = id;
6262	+	Object v;
6263	+	while ((v = t.advance()) != null)
6264	+	r = reducer.apply(r, transformer.apply((V)v));
6265	+	t.result = r;
6266	+	for (;;) {
6267	+	int c; BulkTask<K,V,?> par; MapReduceValuesToLongTask<K,V> s, p;
6268	+	if ((par = t.parent) == null ||
6269	+	!(par instanceof MapReduceValuesToLongTask)) {
6270	+	t.quietlyComplete();
6271	+	break;
6272	+	}
6273	+	else if ((c = (p = (MapReduceValuesToLongTask<K,V>)par).pending) == 0) {
6274	+	if ((s = t.sibling) != null)
6275	+	r = reducer.apply(r, s.result);
6276	+	(t = p).result = r;
6277	+	}
6278	+	else if (p.casPending(c, 0))
6279	+	break;
6280	+	}
6281	+	}
6282	+	public final Long getRawResult() { return result; }
6283	+	}
6284	+
6285	+	static final class MapReduceEntriesToLongTask<K,V>
6286	+	extends BulkTask<K,V,Long> {
6287	+	final ObjectToLong<Map.Entry<K,V>> transformer;
6288	+	final LongByLongToLong reducer;
6289	+	final long basis;
6290	+	long result;
6291	+	MapReduceEntriesToLongTask<K,V> sibling;
6292	+	MapReduceEntriesToLongTask
6293	+	(ConcurrentHashMapV8<K,V> m,
6294	+	ObjectToLong<Map.Entry<K,V>> transformer,
6295	+	long basis,
6296	+	LongByLongToLong reducer) {
6297	+	super(m);
6298	+	this.transformer = transformer;
6299	+	this.basis = basis; this.reducer = reducer;
6300	+	}
6301	+	MapReduceEntriesToLongTask
6302	+	(BulkTask<K,V,?> p, int b, boolean split,
6303	+	ObjectToLong<Map.Entry<K,V>> transformer,
6304	+	long basis,
6305	+	LongByLongToLong reducer) {
6306	+	super(p, b, split);
6307	+	this.transformer = transformer;
6308	+	this.basis = basis; this.reducer = reducer;
6309	+	}
6310	+	public final void compute() {
6311	+	MapReduceEntriesToLongTask<K,V> t = this;
6312	+	final ObjectToLong<Map.Entry<K,V>> transformer =
6313	+	this.transformer;
6314	+	final LongByLongToLong reducer = this.reducer;
6315	+	if (transformer == null || reducer == null)
6316	+	throw new Error(NullFunctionMessage);
6317	+	final long id = this.basis;
6318	+	int b = batch();
6319	+	while (b > 1 && t.baseIndex != t.baseLimit) {
6320	+	b >>>= 1;
6321	+	t.pending = 1;
6322	+	MapReduceEntriesToLongTask<K,V> rt =
6323	+	new MapReduceEntriesToLongTask<K,V>
6324	+	(t, b, true, transformer, id, reducer);
6325	+	t = new MapReduceEntriesToLongTask<K,V>
6326	+	(t, b, false, transformer, id, reducer);
6327	+	t.sibling = rt;
6328	+	rt.sibling = t;
6329	+	rt.fork();
6330	+	}
6331	+	long r = id;
6332	+	Object v;
6333	+	while ((v = t.advance()) != null)
6334	+	r = reducer.apply(r, transformer.apply(entryFor((K)t.nextKey, (V)v)));
6335	+	t.result = r;
6336	+	for (;;) {
6337	+	int c; BulkTask<K,V,?> par; MapReduceEntriesToLongTask<K,V> s, p;
6338	+	if ((par = t.parent) == null ||
6339	+	!(par instanceof MapReduceEntriesToLongTask)) {
6340	+	t.quietlyComplete();
6341	+	break;
6342	+	}
6343	+	else if ((c = (p = (MapReduceEntriesToLongTask<K,V>)par).pending) == 0) {
6344	+	if ((s = t.sibling) != null)
6345	+	r = reducer.apply(r, s.result);
6346	+	(t = p).result = r;
6347	+	}
6348	+	else if (p.casPending(c, 0))
6349	+	break;
6350	+	}
6351	+	}
6352	+	public final Long getRawResult() { return result; }
6353	+	}
6354	+
6355	+	static final class MapReduceMappingsToLongTask<K,V>
6356	+	extends BulkTask<K,V,Long> {
6357	+	final ObjectByObjectToLong<? super K, ? super V> transformer;
6358	+	final LongByLongToLong reducer;
6359	+	final long basis;
6360	+	long result;
6361	+	MapReduceMappingsToLongTask<K,V> sibling;
6362	+	MapReduceMappingsToLongTask
6363	+	(ConcurrentHashMapV8<K,V> m,
6364	+	ObjectByObjectToLong<? super K, ? super V> transformer,
6365	+	long basis,
6366	+	LongByLongToLong reducer) {
6367	+	super(m);
6368	+	this.transformer = transformer;
6369	+	this.basis = basis; this.reducer = reducer;
6370	+	}
6371	+	MapReduceMappingsToLongTask
6372	+	(BulkTask<K,V,?> p, int b, boolean split,
6373	+	ObjectByObjectToLong<? super K, ? super V> transformer,
6374	+	long basis,
6375	+	LongByLongToLong reducer) {
6376	+	super(p, b, split);
6377	+	this.transformer = transformer;
6378	+	this.basis = basis; this.reducer = reducer;
6379	+	}
6380	+	public final void compute() {
6381	+	MapReduceMappingsToLongTask<K,V> t = this;
6382	+	final ObjectByObjectToLong<? super K, ? super V> transformer =
6383	+	this.transformer;
6384	+	final LongByLongToLong reducer = this.reducer;
6385	+	if (transformer == null || reducer == null)
6386	+	throw new Error(NullFunctionMessage);
6387	+	final long id = this.basis;
6388	+	int b = batch();
6389	+	while (b > 1 && t.baseIndex != t.baseLimit) {
6390	+	b >>>= 1;
6391	+	t.pending = 1;
6392	+	MapReduceMappingsToLongTask<K,V> rt =
6393	+	new MapReduceMappingsToLongTask<K,V>
6394	+	(t, b, true, transformer, id, reducer);
6395	+	t = new MapReduceMappingsToLongTask<K,V>
6396	+	(t, b, false, transformer, id, reducer);
6397	+	t.sibling = rt;
6398	+	rt.sibling = t;
6399	+	rt.fork();
6400	+	}
6401	+	long r = id;
6402	+	Object v;
6403	+	while ((v = t.advance()) != null)
6404	+	r = reducer.apply(r, transformer.apply((K)t.nextKey, (V)v));
6405	+	t.result = r;
6406	+	for (;;) {
6407	+	int c; BulkTask<K,V,?> par; MapReduceMappingsToLongTask<K,V> s, p;
6408	+	if ((par = t.parent) == null ||
6409	+	!(par instanceof MapReduceMappingsToLongTask)) {
6410	+	t.quietlyComplete();
6411	+	break;
6412	+	}
6413	+	else if ((c = (p = (MapReduceMappingsToLongTask<K,V>)par).pending) == 0) {
6414	+	if ((s = t.sibling) != null)
6415	+	r = reducer.apply(r, s.result);
6416	+	(t = p).result = r;
6417	+	}
6418	+	else if (p.casPending(c, 0))
6419	+	break;
6420	+	}
6421	+	}
6422	+	public final Long getRawResult() { return result; }
6423	+	}
6424	+
6425	+	static final class MapReduceKeysToIntTask<K,V>
6426	+	extends BulkTask<K,V,Integer> {
6427	+	final ObjectToInt<? super K> transformer;
6428	+	final IntByIntToInt reducer;
6429	+	final int basis;
6430	+	int result;
6431	+	MapReduceKeysToIntTask<K,V> sibling;
6432	+	MapReduceKeysToIntTask
6433	+	(ConcurrentHashMapV8<K,V> m,
6434	+	ObjectToInt<? super K> transformer,
6435	+	int basis,
6436	+	IntByIntToInt reducer) {
6437	+	super(m);
6438	+	this.transformer = transformer;
6439	+	this.basis = basis; this.reducer = reducer;
6440	+	}
6441	+	MapReduceKeysToIntTask
6442	+	(BulkTask<K,V,?> p, int b, boolean split,
6443	+	ObjectToInt<? super K> transformer,
6444	+	int basis,
6445	+	IntByIntToInt reducer) {
6446	+	super(p, b, split);
6447	+	this.transformer = transformer;
6448	+	this.basis = basis; this.reducer = reducer;
6449	+	}
6450	+	public final void compute() {
6451	+	MapReduceKeysToIntTask<K,V> t = this;
6452	+	final ObjectToInt<? super K> transformer =
6453	+	this.transformer;
6454	+	final IntByIntToInt reducer = this.reducer;
6455	+	if (transformer == null || reducer == null)
6456	+	throw new Error(NullFunctionMessage);
6457	+	final int id = this.basis;
6458	+	int b = batch();
6459	+	while (b > 1 && t.baseIndex != t.baseLimit) {
6460	+	b >>>= 1;
6461	+	t.pending = 1;
6462	+	MapReduceKeysToIntTask<K,V> rt =
6463	+	new MapReduceKeysToIntTask<K,V>
6464	+	(t, b, true, transformer, id, reducer);
6465	+	t = new MapReduceKeysToIntTask<K,V>
6466	+	(t, b, false, transformer, id, reducer);
6467	+	t.sibling = rt;
6468	+	rt.sibling = t;
6469	+	rt.fork();
6470	+	}
6471	+	int r = id;
6472	+	while (t.advance() != null)
6473	+	r = reducer.apply(r, transformer.apply((K)t.nextKey));
6474	+	t.result = r;
6475	+	for (;;) {
6476	+	int c; BulkTask<K,V,?> par; MapReduceKeysToIntTask<K,V> s, p;
6477	+	if ((par = t.parent) == null ||
6478	+	!(par instanceof MapReduceKeysToIntTask)) {
6479	+	t.quietlyComplete();
6480	+	break;
6481	+	}
6482	+	else if ((c = (p = (MapReduceKeysToIntTask<K,V>)par).pending) == 0) {
6483	+	if ((s = t.sibling) != null)
6484	+	r = reducer.apply(r, s.result);
6485	+	(t = p).result = r;
6486	+	}
6487	+	else if (p.casPending(c, 0))
6488	+	break;
6489	+	}
6490	+	}
6491	+	public final Integer getRawResult() { return result; }
6492	+	}
6493	+
6494	+	static final class MapReduceValuesToIntTask<K,V>
6495	+	extends BulkTask<K,V,Integer> {
6496	+	final ObjectToInt<? super V> transformer;
6497	+	final IntByIntToInt reducer;
6498	+	final int basis;
6499	+	int result;
6500	+	MapReduceValuesToIntTask<K,V> sibling;
6501	+	MapReduceValuesToIntTask
6502	+	(ConcurrentHashMapV8<K,V> m,
6503	+	ObjectToInt<? super V> transformer,
6504	+	int basis,
6505	+	IntByIntToInt reducer) {
6506	+	super(m);
6507	+	this.transformer = transformer;
6508	+	this.basis = basis; this.reducer = reducer;
6509	+	}
6510	+	MapReduceValuesToIntTask
6511	+	(BulkTask<K,V,?> p, int b, boolean split,
6512	+	ObjectToInt<? super V> transformer,
6513	+	int basis,
6514	+	IntByIntToInt reducer) {
6515	+	super(p, b, split);
6516	+	this.transformer = transformer;
6517	+	this.basis = basis; this.reducer = reducer;
6518	+	}
6519	+	public final void compute() {
6520	+	MapReduceValuesToIntTask<K,V> t = this;
6521	+	final ObjectToInt<? super V> transformer =
6522	+	this.transformer;
6523	+	final IntByIntToInt reducer = this.reducer;
6524	+	if (transformer == null || reducer == null)
6525	+	throw new Error(NullFunctionMessage);
6526	+	final int id = this.basis;
6527	+	int b = batch();
6528	+	while (b > 1 && t.baseIndex != t.baseLimit) {
6529	+	b >>>= 1;
6530	+	t.pending = 1;
6531	+	MapReduceValuesToIntTask<K,V> rt =
6532	+	new MapReduceValuesToIntTask<K,V>
6533	+	(t, b, true, transformer, id, reducer);
6534	+	t = new MapReduceValuesToIntTask<K,V>
6535	+	(t, b, false, transformer, id, reducer);
6536	+	t.sibling = rt;
6537	+	rt.sibling = t;
6538	+	rt.fork();
6539	+	}
6540	+	int r = id;
6541	+	Object v;
6542	+	while ((v = t.advance()) != null)
6543	+	r = reducer.apply(r, transformer.apply((V)v));
6544	+	t.result = r;
6545	+	for (;;) {
6546	+	int c; BulkTask<K,V,?> par; MapReduceValuesToIntTask<K,V> s, p;
6547	+	if ((par = t.parent) == null ||
6548	+	!(par instanceof MapReduceValuesToIntTask)) {
6549	+	t.quietlyComplete();
6550	+	break;
6551	+	}
6552	+	else if ((c = (p = (MapReduceValuesToIntTask<K,V>)par).pending) == 0) {
6553	+	if ((s = t.sibling) != null)
6554	+	r = reducer.apply(r, s.result);
6555	+	(t = p).result = r;
6556	+	}
6557	+	else if (p.casPending(c, 0))
6558	+	break;
6559	+	}
6560	+	}
6561	+	public final Integer getRawResult() { return result; }
6562	+	}
6563	+
6564	+	static final class MapReduceEntriesToIntTask<K,V>
6565	+	extends BulkTask<K,V,Integer> {
6566	+	final ObjectToInt<Map.Entry<K,V>> transformer;
6567	+	final IntByIntToInt reducer;
6568	+	final int basis;
6569	+	int result;
6570	+	MapReduceEntriesToIntTask<K,V> sibling;
6571	+	MapReduceEntriesToIntTask
6572	+	(ConcurrentHashMapV8<K,V> m,
6573	+	ObjectToInt<Map.Entry<K,V>> transformer,
6574	+	int basis,
6575	+	IntByIntToInt reducer) {
6576	+	super(m);
6577	+	this.transformer = transformer;
6578	+	this.basis = basis; this.reducer = reducer;
6579	+	}
6580	+	MapReduceEntriesToIntTask
6581	+	(BulkTask<K,V,?> p, int b, boolean split,
6582	+	ObjectToInt<Map.Entry<K,V>> transformer,
6583	+	int basis,
6584	+	IntByIntToInt reducer) {
6585	+	super(p, b, split);
6586	+	this.transformer = transformer;
6587	+	this.basis = basis; this.reducer = reducer;
6588	+	}
6589	+	public final void compute() {
6590	+	MapReduceEntriesToIntTask<K,V> t = this;
6591	+	final ObjectToInt<Map.Entry<K,V>> transformer =
6592	+	this.transformer;
6593	+	final IntByIntToInt reducer = this.reducer;
6594	+	if (transformer == null || reducer == null)
6595	+	throw new Error(NullFunctionMessage);
6596	+	final int id = this.basis;
6597	+	int b = batch();
6598	+	while (b > 1 && t.baseIndex != t.baseLimit) {
6599	+	b >>>= 1;
6600	+	t.pending = 1;
6601	+	MapReduceEntriesToIntTask<K,V> rt =
6602	+	new MapReduceEntriesToIntTask<K,V>
6603	+	(t, b, true, transformer, id, reducer);
6604	+	t = new MapReduceEntriesToIntTask<K,V>
6605	+	(t, b, false, transformer, id, reducer);
6606	+	t.sibling = rt;
6607	+	rt.sibling = t;
6608	+	rt.fork();
6609	+	}
6610	+	int r = id;
6611	+	Object v;
6612	+	while ((v = t.advance()) != null)
6613	+	r = reducer.apply(r, transformer.apply(entryFor((K)t.nextKey, (V)v)));
6614	+	t.result = r;
6615	+	for (;;) {
6616	+	int c; BulkTask<K,V,?> par; MapReduceEntriesToIntTask<K,V> s, p;
6617	+	if ((par = t.parent) == null ||
6618	+	!(par instanceof MapReduceEntriesToIntTask)) {
6619	+	t.quietlyComplete();
6620	+	break;
6621	+	}
6622	+	else if ((c = (p = (MapReduceEntriesToIntTask<K,V>)par).pending) == 0) {
6623	+	if ((s = t.sibling) != null)
6624	+	r = reducer.apply(r, s.result);
6625	+	(t = p).result = r;
6626	+	}
6627	+	else if (p.casPending(c, 0))
6628	+	break;
6629	+	}
6630	+	}
6631	+	public final Integer getRawResult() { return result; }
6632	+	}
6633	+
6634	+	static final class MapReduceMappingsToIntTask<K,V>
6635	+	extends BulkTask<K,V,Integer> {
6636	+	final ObjectByObjectToInt<? super K, ? super V> transformer;
6637	+	final IntByIntToInt reducer;
6638	+	final int basis;
6639	+	int result;
6640	+	MapReduceMappingsToIntTask<K,V> sibling;
6641	+	MapReduceMappingsToIntTask
6642	+	(ConcurrentHashMapV8<K,V> m,
6643	+	ObjectByObjectToInt<? super K, ? super V> transformer,
6644	+	int basis,
6645	+	IntByIntToInt reducer) {
6646	+	super(m);
6647	+	this.transformer = transformer;
6648	+	this.basis = basis; this.reducer = reducer;
6649	+	}
6650	+	MapReduceMappingsToIntTask
6651	+	(BulkTask<K,V,?> p, int b, boolean split,
6652	+	ObjectByObjectToInt<? super K, ? super V> transformer,
6653	+	int basis,
6654	+	IntByIntToInt reducer) {
6655	+	super(p, b, split);
6656	+	this.transformer = transformer;
6657	+	this.basis = basis; this.reducer = reducer;
6658	+	}
6659	+	public final void compute() {
6660	+	MapReduceMappingsToIntTask<K,V> t = this;
6661	+	final ObjectByObjectToInt<? super K, ? super V> transformer =
6662	+	this.transformer;
6663	+	final IntByIntToInt reducer = this.reducer;
6664	+	if (transformer == null || reducer == null)
6665	+	throw new Error(NullFunctionMessage);
6666	+	final int id = this.basis;
6667	+	int b = batch();
6668	+	while (b > 1 && t.baseIndex != t.baseLimit) {
6669	+	b >>>= 1;
6670	+	t.pending = 1;
6671	+	MapReduceMappingsToIntTask<K,V> rt =
6672	+	new MapReduceMappingsToIntTask<K,V>
6673	+	(t, b, true, transformer, id, reducer);
6674	+	t = new MapReduceMappingsToIntTask<K,V>
6675	+	(t, b, false, transformer, id, reducer);
6676	+	t.sibling = rt;
6677	+	rt.sibling = t;
6678	+	rt.fork();
6679	+	}
6680	+	int r = id;
6681	+	Object v;
6682	+	while ((v = t.advance()) != null)
6683	+	r = reducer.apply(r, transformer.apply((K)t.nextKey, (V)v));
6684	+	t.result = r;
6685	+	for (;;) {
6686	+	int c; BulkTask<K,V,?> par; MapReduceMappingsToIntTask<K,V> s, p;
6687	+	if ((par = t.parent) == null ||
6688	+	!(par instanceof MapReduceMappingsToIntTask)) {
6689	+	t.quietlyComplete();
6690	+	break;
6691	+	}
6692	+	else if ((c = (p = (MapReduceMappingsToIntTask<K,V>)par).pending) == 0) {
6693	+	if ((s = t.sibling) != null)
6694	+	r = reducer.apply(r, s.result);
6695	+	(t = p).result = r;
6696	+	}
6697	+	else if (p.casPending(c, 0))
6698	+	break;
6699	+	}
6700	+	}
6701	+	public final Integer getRawResult() { return result; }
6702	+	}
6703	+
6704	+
6705		// Unsafe mechanics
6706		private static final sun.misc.Unsafe UNSAFE;
6707		private static final long counterOffset;
6708	<	private static final long resizingOffset;
6708	>	private static final long sizeCtlOffset;
6709		private static final long ABASE;
6710		private static final int ASHIFT;
6711
#	Line 1695 | Line 6716 | public class ConcurrentHashMapV8<K, V>
6716		Class<?> k = ConcurrentHashMapV8.class;
6717		counterOffset = UNSAFE.objectFieldOffset
6718		(k.getDeclaredField("counter"));
6719	<	resizingOffset = UNSAFE.objectFieldOffset
6720	<	(k.getDeclaredField("resizing"));
6719	>	sizeCtlOffset = UNSAFE.objectFieldOffset
6720	>	(k.getDeclaredField("sizeCtl"));
6721		Class<?> sc = Node[].class;
6722		ABASE = UNSAFE.arrayBaseOffset(sc);
6723		ss = UNSAFE.arrayIndexScale(sc);
#	Line 1735 | Line 6756 | public class ConcurrentHashMapV8<K, V>
6756		}
6757		}
6758		}
1738	–
6759		}

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