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Comparing jsr166/src/jsr166y/ForkJoinTask.java (file contents):
Revision 1.9 by jsr166, Mon Jul 20 22:26:03 2009 UTC vs.
Revision 1.64 by jsr166, Mon Sep 20 20:42:37 2010 UTC

#	Line 5 | Line 5
5		*/
6
7		package jsr166y;
8	<	import java.io.Serializable;
9	<	import java.util.*;
8	>
9		import java.util.concurrent.*;
10	<	import java.util.concurrent.atomic.*;
11	<	import sun.misc.Unsafe;
12	<	import java.lang.reflect.*;
10	>	import java.io.Serializable;
11	>	import java.util.Collection;
12	>	import java.util.Collections;
13	>	import java.util.List;
14	>	import java.util.RandomAccess;
15	>	import java.util.Map;
16	>	import java.util.WeakHashMap;
17
18		/**
19	<	* Abstract base class for tasks that run within a {@link
20	<	* ForkJoinPool}.  A ForkJoinTask is a thread-like entity that is much
19	>	* Abstract base class for tasks that run within a {@link ForkJoinPool}.
20	>	* A {@code ForkJoinTask} is a thread-like entity that is much
21		* lighter weight than a normal thread.  Huge numbers of tasks and
22		* subtasks may be hosted by a small number of actual threads in a
23		* ForkJoinPool, at the price of some usage limitations.
24		*
25	<	* <p> A "main" ForkJoinTask begins execution when submitted to a
26	<	* {@link ForkJoinPool}. Once started, it will usually in turn start
27	<	* other subtasks.  As indicated by the name of this class, many
28	<	* programs using ForkJoinTasks employ only methods {@code fork}
29	<	* and {@code join}, or derivatives such as
30	<	* {@code invokeAll}.  However, this class also provides a number
31	<	* of other methods that can come into play in advanced usages, as
32	<	* well as extension mechanics that allow support of new forms of
33	<	* fork/join processing.
25	>	* <p>A "main" {@code ForkJoinTask} begins execution when submitted
26	>	* to a {@link ForkJoinPool}.  Once started, it will usually in turn
27	>	* start other subtasks.  As indicated by the name of this class,
28	>	* many programs using {@code ForkJoinTask} employ only methods
29	>	* {@link #fork} and {@link #join}, or derivatives such as {@link
30	>	* #invokeAll(ForkJoinTask...) invokeAll}.  However, this class also
31	>	* provides a number of other methods that can come into play in
32	>	* advanced usages, as well as extension mechanics that allow
33	>	* support of new forms of fork/join processing.
34		*
35	<	* <p>A ForkJoinTask is a lightweight form of {@link Future}.  The
36	<	* efficiency of ForkJoinTasks stems from a set of restrictions (that
37	<	* are only partially statically enforceable) reflecting their
38	<	* intended use as computational tasks calculating pure functions or
39	<	* operating on purely isolated objects.  The primary coordination
40	<	* mechanisms are {@link #fork}, that arranges asynchronous execution,
41	<	* and {@link #join}, that doesn't proceed until the task's result has
42	<	* been computed.  Computations should avoid {@code synchronized}
43	<	* methods or blocks, and should minimize other blocking
44	<	* synchronization apart from joining other tasks or using
45	<	* synchronizers such as Phasers that are advertised to cooperate with
46	<	* fork/join scheduling. Tasks should also not perform blocking IO,
47	<	* and should ideally access variables that are completely independent
48	<	* of those accessed by other running tasks. Minor breaches of these
49	<	* restrictions, for example using shared output streams, may be
50	<	* tolerable in practice, but frequent use may result in poor
51	<	* performance, and the potential to indefinitely stall if the number
52	<	* of threads not waiting for IO or other external synchronization
53	<	* becomes exhausted. This usage restriction is in part enforced by
54	<	* not permitting checked exceptions such as {@code IOExceptions}
55	<	* to be thrown. However, computations may still encounter unchecked
56	<	* exceptions, that are rethrown to callers attempting join
57	<	* them. These exceptions may additionally include
58	<	* RejectedExecutionExceptions stemming from internal resource
59	<	* exhaustion such as failure to allocate internal task queues.
35	>	* <p>A {@code ForkJoinTask} is a lightweight form of {@link Future}.
36	>	* The efficiency of {@code ForkJoinTask}s stems from a set of
37	>	* restrictions (that are only partially statically enforceable)
38	>	* reflecting their intended use as computational tasks calculating
39	>	* pure functions or operating on purely isolated objects.  The
40	>	* primary coordination mechanisms are {@link #fork}, that arranges
41	>	* asynchronous execution, and {@link #join}, that doesn't proceed
42	>	* until the task's result has been computed.  Computations should
43	>	* avoid {@code synchronized} methods or blocks, and should minimize
44	>	* other blocking synchronization apart from joining other tasks or
45	>	* using synchronizers such as Phasers that are advertised to
46	>	* cooperate with fork/join scheduling. Tasks should also not perform
47	>	* blocking IO, and should ideally access variables that are
48	>	* completely independent of those accessed by other running
49	>	* tasks. Minor breaches of these restrictions, for example using
50	>	* shared output streams, may be tolerable in practice, but frequent
51	>	* use may result in poor performance, and the potential to
52	>	* indefinitely stall if the number of threads not waiting for IO or
53	>	* other external synchronization becomes exhausted. This usage
54	>	* restriction is in part enforced by not permitting checked
55	>	* exceptions such as {@code IOExceptions} to be thrown. However,
56	>	* computations may still encounter unchecked exceptions, that are
57	>	* rethrown to callers attempting to join them. These exceptions may
58	>	* additionally include {@link RejectedExecutionException} stemming
59	>	* from internal resource exhaustion, such as failure to allocate
60	>	* internal task queues.
61		*
62		* <p>The primary method for awaiting completion and extracting
63		* results of a task is {@link #join}, but there are several variants:
64		* The {@link Future#get} methods support interruptible and/or timed
65		* waits for completion and report results using {@code Future}
66	<	* conventions. Method {@link #helpJoin} enables callers to actively
67	<	* execute other tasks while awaiting joins, which is sometimes more
68	<	* efficient but only applies when all subtasks are known to be
69	<	* strictly tree-structured. Method {@link #invoke} is semantically
66	<	* equivalent to {@code fork(); join()} but always attempts to
67	<	* begin execution in the current thread. The "<em>quiet</em>" forms
68	<	* of these methods do not extract results or report exceptions. These
66	>	* conventions. Method {@link #invoke} is semantically
67	>	* equivalent to {@code fork(); join()} but always attempts to begin
68	>	* execution in the current thread. The "<em>quiet</em>" forms of
69	>	* these methods do not extract results or report exceptions. These
70		* may be useful when a set of tasks are being executed, and you need
71		* to delay processing of results or exceptions until all complete.
72		* Method {@code invokeAll} (available in multiple versions)
73		* performs the most common form of parallel invocation: forking a set
74		* of tasks and joining them all.
75		*
76	<	* <p> The ForkJoinTask class is not usually directly subclassed.
76	>	* <p>The execution status of tasks may be queried at several levels
77	>	* of detail: {@link #isDone} is true if a task completed in any way
78	>	* (including the case where a task was cancelled without executing);
79	>	* {@link #isCompletedNormally} is true if a task completed without
80	>	* cancellation or encountering an exception; {@link #isCancelled} is
81	>	* true if the task was cancelled (in which case {@link #getException}
82	>	* returns a {@link java.util.concurrent.CancellationException}); and
83	>	* {@link #isCompletedAbnormally} is true if a task was either
84	>	* cancelled or encountered an exception, in which case {@link
85	>	* #getException} will return either the encountered exception or
86	>	* {@link java.util.concurrent.CancellationException}.
87	>	*
88	>	* <p>The ForkJoinTask class is not usually directly subclassed.
89		* Instead, you subclass one of the abstract classes that support a
90	<	* particular style of fork/join processing.  Normally, a concrete
90	>	* particular style of fork/join processing, typically {@link
91	>	* RecursiveAction} for computations that do not return results, or
92	>	* {@link RecursiveTask} for those that do.  Normally, a concrete
93		* ForkJoinTask subclass declares fields comprising its parameters,
94		* established in a constructor, and then defines a {@code compute}
95		* method that somehow uses the control methods supplied by this base
96		* class. While these methods have {@code public} access (to allow
97	<	* instances of different task subclasses to call each others
97	>	* instances of different task subclasses to call each other's
98		* methods), some of them may only be called from within other
99	<	* ForkJoinTasks. Attempts to invoke them in other contexts result in
100	<	* exceptions or errors possibly including ClassCastException.
99	>	* ForkJoinTasks (as may be determined using method {@link
100	>	* #inForkJoinPool}).  Attempts to invoke them in other contexts
101	>	* result in exceptions or errors, possibly including
102	>	* {@code ClassCastException}.
103		*
104	<	* <p>Most base support methods are {@code final} because their
105	<	* implementations are intrinsically tied to the underlying
106	<	* lightweight task scheduling framework, and so cannot be overridden.
107	<	* Developers creating new basic styles of fork/join processing should
108	<	* minimally implement {@code protected} methods
109	<	* {@code exec}, {@code setRawResult}, and
110	<	* {@code getRawResult}, while also introducing an abstract
111	<	* computational method that can be implemented in its subclasses,
112	<	* possibly relying on other {@code protected} methods provided
96	<	* by this class.
104	>	* <p>Most base support methods are {@code final}, to prevent
105	>	* overriding of implementations that are intrinsically tied to the
106	>	* underlying lightweight task scheduling framework.  Developers
107	>	* creating new basic styles of fork/join processing should minimally
108	>	* implement {@code protected} methods {@link #exec}, {@link
109	>	* #setRawResult}, and {@link #getRawResult}, while also introducing
110	>	* an abstract computational method that can be implemented in its
111	>	* subclasses, possibly relying on other {@code protected} methods
112	>	* provided by this class.
113		*
114		* <p>ForkJoinTasks should perform relatively small amounts of
115	<	* computations, otherwise splitting into smaller tasks. As a very
116	<	* rough rule of thumb, a task should perform more than 100 and less
117	<	* than 10000 basic computational steps. If tasks are too big, then
118	<	* parallelism cannot improve throughput. If too small, then memory
119	<	* and internal task maintenance overhead may overwhelm processing.
115	>	* computation. Large tasks should be split into smaller subtasks,
116	>	* usually via recursive decomposition. As a very rough rule of thumb,
117	>	* a task should perform more than 100 and less than 10000 basic
118	>	* computational steps. If tasks are too big, then parallelism cannot
119	>	* improve throughput. If too small, then memory and internal task
120	>	* maintenance overhead may overwhelm processing.
121	>	*
122	>	* <p>This class provides {@code adapt} methods for {@link Runnable}
123	>	* and {@link Callable}, that may be of use when mixing execution of
124	>	* {@code ForkJoinTasks} with other kinds of tasks. When all tasks are
125	>	* of this form, consider using a pool constructed in <em>asyncMode</em>.
126		*
127	<	* <p>ForkJoinTasks are {@code Serializable}, which enables them
128	<	* to be used in extensions such as remote execution frameworks. It is
129	<	* in general sensible to serialize tasks only before or after, but
130	<	* not during execution. Serialization is not relied on during
131	<	* execution itself.
127	>	* <p>ForkJoinTasks are {@code Serializable}, which enables them to be
128	>	* used in extensions such as remote execution frameworks. It is
129	>	* sensible to serialize tasks only before or after, but not during,
130	>	* execution. Serialization is not relied on during execution itself.
131	>	*
132	>	* @since 1.7
133	>	* @author Doug Lea
134		*/
135		public abstract class ForkJoinTask<V> implements Future<V>, Serializable {
136
137	<	/**
138	<	* Run control status bits packed into a single int to minimize
139	<	* footprint and to ensure atomicity (via CAS).  Status is
140	<	* initially zero, and takes on nonnegative values until
141	<	* completed, upon which status holds COMPLETED. CANCELLED, or
142	<	* EXCEPTIONAL, which use the top 3 bits.  Tasks undergoing
143	<	* blocking waits by other threads have SIGNAL_MASK bits set --
144	<	* bit 15 for external (nonFJ) waits, and the rest a count of
145	<	* waiting FJ threads.  (This representation relies on
146	<	* ForkJoinPool max thread limits). Completion of a stolen task
147	<	* with SIGNAL_MASK bits set awakens waiter via notifyAll. Even
148	<	* though suboptimal for some purposes, we use basic builtin
149	<	* wait/notify to take advantage of "monitor inflation" in JVMs
150	<	* that we would otherwise need to emulate to avoid adding further
151	<	* per-task bookkeeping overhead. Note that bits 16-28 are
152	<	* currently unused. Also value 0x80000000 is available as spare
153	<	* completion value.
137	>	/*
138	>	* See the internal documentation of class ForkJoinPool for a
139	>	* general implementation overview.  ForkJoinTasks are mainly
140	>	* responsible for maintaining their "status" field amidst relays
141	>	* to methods in ForkJoinWorkerThread and ForkJoinPool. The
142	>	* methods of this class are more-or-less layered into (1) basic
143	>	* status maintenance (2) execution and awaiting completion (3)
144	>	* user-level methods that additionally report results. This is
145	>	* sometimes hard to see because this file orders exported methods
146	>	* in a way that flows well in javadocs. In particular, most
147	>	* join mechanics are in method quietlyJoin, below.
148	>	*/
149	>
150	>	/*
151	>	* The status field holds run control status bits packed into a
152	>	* single int to minimize footprint and to ensure atomicity (via
153	>	* CAS).  Status is initially zero, and takes on nonnegative
154	>	* values until completed, upon which status holds value
155	>	* NORMAL, CANCELLED, or EXCEPTIONAL. Tasks undergoing blocking
156	>	* waits by other threads have the SIGNAL bit set.  Completion of
157	>	* a stolen task with SIGNAL set awakens any waiters via
158	>	* notifyAll. Even though suboptimal for some purposes, we use
159	>	* basic builtin wait/notify to take advantage of "monitor
160	>	* inflation" in JVMs that we would otherwise need to emulate to
161	>	* avoid adding further per-task bookkeeping overhead.  We want
162	>	* these monitors to be "fat", i.e., not use biasing or thin-lock
163	>	* techniques, so use some odd coding idioms that tend to avoid
164	>	* them.
165		*/
166	+
167	+	/** The run status of this task */
168		volatile int status; // accessed directly by pool and workers
169
170	<	static final int COMPLETION_MASK      = 0xe0000000;
171	<	static final int NORMAL               = 0xe0000000; // == mask
172	<	static final int CANCELLED            = 0xc0000000;
173	<	static final int EXCEPTIONAL          = 0xa0000000;
137	<	static final int SIGNAL_MASK          = 0x0000ffff;
138	<	static final int INTERNAL_SIGNAL_MASK = 0x00007fff;
139	<	static final int EXTERNAL_SIGNAL      = 0x00008000; // top bit of low word
170	>	private static final int NORMAL      = -1;
171	>	private static final int CANCELLED   = -2;
172	>	private static final int EXCEPTIONAL = -3;
173	>	private static final int SIGNAL      =  1;
174
175		/**
176		* Table of exceptions thrown by tasks, to enable reporting by
177		* callers. Because exceptions are rare, we don't directly keep
178	<	* them with task objects, but instead us a weak ref table.  Note
178	>	* them with task objects, but instead use a weak ref table.  Note
179		* that cancellation exceptions don't appear in the table, but are
180		* instead recorded as status values.
181	<	* Todo: Use ConcurrentReferenceHashMap
181	>	* TODO: Use ConcurrentReferenceHashMap
182		*/
183		static final Map<ForkJoinTask<?>, Throwable> exceptionMap =
184		Collections.synchronizedMap
185		(new WeakHashMap<ForkJoinTask<?>, Throwable>());
186
187	<	// within-package utilities
154	<
155	<	/**
156	<	* Get current worker thread, or null if not a worker thread
157	<	*/
158	<	static ForkJoinWorkerThread getWorker() {
159	<	Thread t = Thread.currentThread();
160	<	return ((t instanceof ForkJoinWorkerThread)?
161	<	(ForkJoinWorkerThread)t : null);
162	<	}
163	<
164	<	final boolean casStatus(int cmp, int val) {
165	<	return _unsafe.compareAndSwapInt(this, statusOffset, cmp, val);
166	<	}
187	>	// Maintaining completion status
188
189		/**
190	<	* Workaround for not being able to rethrow unchecked exceptions.
191	<	*/
192	<	static void rethrowException(Throwable ex) {
172	<	if (ex != null)
173	<	_unsafe.throwException(ex);
174	<	}
175	<
176	<	// Setting completion status
177	<
178	<	/**
179	<	* Mark completion and wake up threads waiting to join this task.
190	>	* Marks completion and wakes up threads waiting to join this task,
191	>	* also clearing signal request bits.
192	>	*
193		* @param completion one of NORMAL, CANCELLED, EXCEPTIONAL
194		*/
195	<	final void setCompletion(int completion) {
196	<	ForkJoinPool pool = getPool();
197	<	if (pool != null) {
198	<	int s; // Clear signal bits while setting completion status
199	<	do;while ((s = status) >= 0 && !casStatus(s, completion));
200	<
201	<	if ((s & SIGNAL_MASK) != 0) {
189	<	if ((s &= INTERNAL_SIGNAL_MASK) != 0)
190	<	pool.updateRunningCount(s);
191	<	synchronized(this) { notifyAll(); }
195	>	private void setCompletion(int completion) {
196	>	int s;
197	>	while ((s = status) >= 0) {
198	>	if (UNSAFE.compareAndSwapInt(this, statusOffset, s, completion)) {
199	>	if (s != 0)
200	>	synchronized (this) { notifyAll(); }
201	>	break;
202		}
203		}
194	–	else
195	–	externallySetCompletion(completion);
204		}
205
206		/**
207	<	* Version of setCompletion for non-FJ threads.  Leaves signal
208	<	* bits for unblocked threads to adjust, and always notifies.
209	<	*/
202	<	private void externallySetCompletion(int completion) {
203	<	int s;
204	<	do;while ((s = status) >= 0 &&
205	<	!casStatus(s, (s & SIGNAL_MASK) | completion));
206	<	synchronized(this) { notifyAll(); }
207	<	}
208	<
209	<	/**
210	<	* Sets status to indicate normal completion
211	<	*/
212	<	final void setNormalCompletion() {
213	<	// Try typical fast case -- single CAS, no signal, not already done.
214	<	// Manually expand casStatus to improve chances of inlining it
215	<	if (!_unsafe.compareAndSwapInt(this, statusOffset, 0, NORMAL))
216	<	setCompletion(NORMAL);
217	<	}
218	<
219	<	// internal waiting and notification
220	<
221	<	/**
222	<	* Performs the actual monitor wait for awaitDone
207	>	* Records exception and sets exceptional completion.
208	>	*
209	>	* @return status on exit
210		*/
211	<	private void doAwaitDone() {
212	<	// Minimize lock bias and in/de-flation effects by maximizing
213	<	// chances of waiting inside sync
227	<	try {
228	<	while (status >= 0)
229	<	synchronized(this) { if (status >= 0) wait(); }
230	<	} catch (InterruptedException ie) {
231	<	onInterruptedWait();
232	<	}
211	>	private void setExceptionalCompletion(Throwable rex) {
212	>	exceptionMap.put(this, rex);
213	>	setCompletion(EXCEPTIONAL);
214		}
215
216		/**
217	<	* Performs the actual monitor wait for awaitDone
217	>	* Blocks a worker thread until completion. Called only by
218	>	* pool. Currently unused -- pool-based waits use timeout
219	>	* version below.
220		*/
221	<	private void doAwaitDone(long startTime, long nanos) {
222	<	synchronized(this) {
221	>	final void internalAwaitDone() {
222	>	int s;         // the odd construction reduces lock bias effects
223	>	while ((s = status) >= 0) {
224		try {
225	<	while (status >= 0) {
226	<	long nt = nanos - System.nanoTime() - startTime;
227	<	if (nt <= 0)
244	<	break;
245	<	wait(nt / 1000000, (int)(nt % 1000000));
225	>	synchronized (this) {
226	>	if (UNSAFE.compareAndSwapInt(this, statusOffset, s,SIGNAL))
227	>	wait();
228		}
229		} catch (InterruptedException ie) {
230	<	onInterruptedWait();
249	<	}
250	<	}
251	<	}
252	<
253	<	// Awaiting completion
254	<
255	<	/**
256	<	* Sets status to indicate there is joiner, then waits for join,
257	<	* surrounded with pool notifications.
258	<	* @return status upon exit
259	<	*/
260	<	private int awaitDone(ForkJoinWorkerThread w, boolean maintainParallelism) {
261	<	ForkJoinPool pool = w == null? null : w.pool;
262	<	int s;
263	<	while ((s = status) >= 0) {
264	<	if (casStatus(s, pool == null? s|EXTERNAL_SIGNAL : s+1)) {
265	<	if (pool == null || !pool.preJoin(this, maintainParallelism))
266	<	doAwaitDone();
267	<	if (((s = status) & INTERNAL_SIGNAL_MASK) != 0)
268	<	adjustPoolCountsOnUnblock(pool);
269	<	break;
230	>	cancelIfTerminating();
231		}
232		}
272	–	return s;
233		}
234
235		/**
236	<	* Timed version of awaitDone
237	<	* @return status upon exit
236	>	* Blocks a worker thread until completed or timed out.  Called
237	>	* only by pool.
238	>	*
239	>	* @return status on exit
240		*/
241	<	private int awaitDone(ForkJoinWorkerThread w, long nanos) {
280	<	ForkJoinPool pool = w == null? null : w.pool;
241	>	final int internalAwaitDone(long millis) {
242		int s;
243	<	while ((s = status) >= 0) {
244	<	if (casStatus(s, pool == null? s|EXTERNAL_SIGNAL : s+1)) {
245	<	long startTime = System.nanoTime();
246	<	if (pool == null || !pool.preJoin(this, false))
247	<	doAwaitDone(startTime, nanos);
287	<	if ((s = status) >= 0) {
288	<	adjustPoolCountsOnCancelledWait(pool);
289	<	s = status;
243	>	if ((s = status) >= 0) {
244	>	try {
245	>	synchronized (this) {
246	>	if (UNSAFE.compareAndSwapInt(this, statusOffset, s,SIGNAL))
247	>	wait(millis, 0);
248		}
249	<	if (s < 0 && (s & INTERNAL_SIGNAL_MASK) != 0)
250	<	adjustPoolCountsOnUnblock(pool);
293	<	break;
249	>	} catch (InterruptedException ie) {
250	>	cancelIfTerminating();
251		}
252	+	s = status;
253		}
254		return s;
255		}
256
257		/**
258	<	* Notify pool that thread is unblocked. Called by signalled
301	<	* threads when woken by non-FJ threads (which is atypical).
258	>	* Blocks a non-worker-thread until completion.
259		*/
260	<	private void adjustPoolCountsOnUnblock(ForkJoinPool pool) {
260	>	private void externalAwaitDone() {
261		int s;
262	<	do;while ((s = status) < 0 && !casStatus(s, s & COMPLETION_MASK));
263	<	if (pool != null && (s &= INTERNAL_SIGNAL_MASK) != 0)
264	<	pool.updateRunningCount(s);
265	<	}
266	<
267	<	/**
268	<	* Notify pool to adjust counts on cancelled or timed out wait
269	<	*/
270	<	private void adjustPoolCountsOnCancelledWait(ForkJoinPool pool) {
271	<	if (pool != null) {
272	<	int s;
273	<	while ((s = status) >= 0 && (s & INTERNAL_SIGNAL_MASK) != 0) {
274	<	if (casStatus(s, s - 1)) {
318	<	pool.updateRunningCount(1);
262	>	while ((s = status) >= 0) {
263	>	synchronized (this) {
264	>	if (UNSAFE.compareAndSwapInt(this, statusOffset, s, SIGNAL)){
265	>	boolean interrupted = false;
266	>	while (status >= 0) {
267	>	try {
268	>	wait();
269	>	} catch (InterruptedException ie) {
270	>	interrupted = true;
271	>	}
272	>	}
273	>	if (interrupted)
274	>	Thread.currentThread().interrupt();
275		break;
276		}
277		}
#	Line 323 | Line 279 | public abstract class ForkJoinTask<V> im
279		}
280
281		/**
282	<	* Handle interruptions during waits.
283	<	*/
284	<	private void onInterruptedWait() {
329	<	ForkJoinWorkerThread w = getWorker();
330	<	if (w == null)
331	<	Thread.currentThread().interrupt(); // re-interrupt
332	<	else if (w.isTerminating())
333	<	cancelIgnoringExceptions();
334	<	// else if FJworker, ignore interrupt
335	<	}
336	<
337	<	// Recording and reporting exceptions
338	<
339	<	private void setDoneExceptionally(Throwable rex) {
340	<	exceptionMap.put(this, rex);
341	<	setCompletion(EXCEPTIONAL);
342	<	}
343	<
344	<	/**
345	<	* Throws the exception associated with status s;
346	<	* @throws the exception
347	<	*/
348	<	private void reportException(int s) {
349	<	if ((s &= COMPLETION_MASK) < NORMAL) {
350	<	if (s == CANCELLED)
351	<	throw new CancellationException();
352	<	else
353	<	rethrowException(exceptionMap.get(this));
354	<	}
355	<	}
356	<
357	<	/**
358	<	* Returns result or throws exception using j.u.c.Future conventions
359	<	* Only call when isDone known to be true.
360	<	*/
361	<	private V reportFutureResult()
362	<	throws ExecutionException, InterruptedException {
363	<	int s = status & COMPLETION_MASK;
364	<	if (s < NORMAL) {
365	<	Throwable ex;
366	<	if (s == CANCELLED)
367	<	throw new CancellationException();
368	<	if (s == EXCEPTIONAL && (ex = exceptionMap.get(this)) != null)
369	<	throw new ExecutionException(ex);
370	<	if (Thread.interrupted())
371	<	throw new InterruptedException();
372	<	}
373	<	return getRawResult();
374	<	}
375	<
376	<	/**
377	<	* Returns result or throws exception using j.u.c.Future conventions
378	<	* with timeouts
379	<	*/
380	<	private V reportTimedFutureResult()
381	<	throws InterruptedException, ExecutionException, TimeoutException {
382	<	Throwable ex;
383	<	int s = status & COMPLETION_MASK;
384	<	if (s == NORMAL)
385	<	return getRawResult();
386	<	if (s == CANCELLED)
387	<	throw new CancellationException();
388	<	if (s == EXCEPTIONAL && (ex = exceptionMap.get(this)) != null)
389	<	throw new ExecutionException(ex);
390	<	if (Thread.interrupted())
391	<	throw new InterruptedException();
392	<	throw new TimeoutException();
393	<	}
394	<
395	<	// internal execution methods
396	<
397	<	/**
398	<	* Calls exec, recording completion, and rethrowing exception if
399	<	* encountered. Caller should normally check status before calling
400	<	* @return true if completed normally
401	<	*/
402	<	private boolean tryExec() {
403	<	try { // try block must contain only call to exec
404	<	if (!exec())
405	<	return false;
406	<	} catch (Throwable rex) {
407	<	setDoneExceptionally(rex);
408	<	rethrowException(rex);
409	<	return false; // not reached
410	<	}
411	<	setNormalCompletion();
412	<	return true;
413	<	}
414	<
415	<	/**
416	<	* Main execution method used by worker threads. Invokes
417	<	* base computation unless already complete
282	>	* Unless done, calls exec and records status if completed, but
283	>	* doesn't wait for completion otherwise. Primary execution method
284	>	* for ForkJoinWorkerThread.
285		*/
286		final void quietlyExec() {
420	–	if (status >= 0) {
421	–	try {
422	–	if (!exec())
423	–	return;
424	–	} catch(Throwable rex) {
425	–	setDoneExceptionally(rex);
426	–	return;
427	–	}
428	–	setNormalCompletion();
429	–	}
430	–	}
431	–
432	–	/**
433	–	* Calls exec, recording but not rethrowing exception
434	–	* Caller should normally check status before calling
435	–	* @return true if completed normally
436	–	*/
437	–	private boolean tryQuietlyInvoke() {
287		try {
288	<	if (!exec())
289	<	return false;
288	>	if (status < 0 || !exec())
289	>	return;
290		} catch (Throwable rex) {
291	<	setDoneExceptionally(rex);
292	<	return false;
444	<	}
445	<	setNormalCompletion();
446	<	return true;
447	<	}
448	<
449	<	/**
450	<	* Cancel, ignoring any exceptions it throws
451	<	*/
452	<	final void cancelIgnoringExceptions() {
453	<	try {
454	<	cancel(false);
455	<	} catch(Throwable ignore) {
291	>	setExceptionalCompletion(rex);
292	>	return;
293		}
294	<	}
458	<
459	<	/**
460	<	* Main implementation of helpJoin
461	<	*/
462	<	private int busyJoin(ForkJoinWorkerThread w) {
463	<	int s;
464	<	ForkJoinTask<?> t;
465	<	while ((s = status) >= 0 && (t = w.scanWhileJoining(this)) != null)
466	<	t.quietlyExec();
467	<	return (s >= 0)? awaitDone(w, false) : s; // block if no work
294	>	setCompletion(NORMAL); // must be outside try block
295		}
296
297		// public methods
#	Line 472 | Line 299 | public abstract class ForkJoinTask<V> im
299		/**
300		* Arranges to asynchronously execute this task.  While it is not
301		* necessarily enforced, it is a usage error to fork a task more
302	<	* than once unless it has completed and been reinitialized.  This
303	<	* method may be invoked only from within ForkJoinTask
304	<	* computations. Attempts to invoke in other contexts result in
305	<	* exceptions or errors possibly including ClassCastException.
302	>	* than once unless it has completed and been reinitialized.
303	>	* Subsequent modifications to the state of this task or any data
304	>	* it operates on are not necessarily consistently observable by
305	>	* any thread other than the one executing it unless preceded by a
306	>	* call to {@link #join} or related methods, or a call to {@link
307	>	* #isDone} returning {@code true}.
308	>	*
309	>	* <p>This method may be invoked only from within {@code
310	>	* ForkJoinTask} computations (as may be determined using method
311	>	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
312	>	* result in exceptions or errors, possibly including {@code
313	>	* ClassCastException}.
314	>	*
315	>	* @return {@code this}, to simplify usage
316		*/
317	<	public final void fork() {
318	<	((ForkJoinWorkerThread)(Thread.currentThread())).pushTask(this);
317	>	public final ForkJoinTask<V> fork() {
318	>	((ForkJoinWorkerThread) Thread.currentThread())
319	>	.pushTask(this);
320	>	return this;
321		}
322
323		/**
324	<	* Returns the result of the computation when it is ready.
325	<	* This method differs from {@code get} in that abnormal
326	<	* completion results in RuntimeExceptions or Errors, not
327	<	* ExecutionExceptions.
324	>	* Returns the result of the computation when it {@link #isDone is done}.
325	>	* This method differs from {@link #get()} in that
326	>	* abnormal completion results in {@code RuntimeException} or
327	>	* {@code Error}, not {@code ExecutionException}.
328		*
329		* @return the computed result
330		*/
331		public final V join() {
332	<	ForkJoinWorkerThread w = getWorker();
333	<	if (w == null || status < 0 || !w.unpushTask(this) || !tryExec())
334	<	reportException(awaitDone(w, true));
332	>	quietlyJoin();
333	>	Throwable ex;
334	>	if (status < NORMAL && (ex = getException()) != null)
335	>	UNSAFE.throwException(ex);
336		return getRawResult();
337		}
338
339		/**
340		* Commences performing this task, awaits its completion if
341	<	* necessary, and return its result.
342	<	* @throws Throwable (a RuntimeException, Error, or unchecked
343	<	* exception) if the underlying computation did so.
341	>	* necessary, and returns its result, or throws an (unchecked)
342	>	* {@code RuntimeException} or {@code Error} if the underlying
343	>	* computation did so.
344	>	*
345		* @return the computed result
346		*/
347		public final V invoke() {
348	<	if (status >= 0 && tryExec())
349	<	return getRawResult();
350	<	else
351	<	return join();
348	>	quietlyInvoke();
349	>	Throwable ex;
350	>	if (status < NORMAL && (ex = getException()) != null)
351	>	UNSAFE.throwException(ex);
352	>	return getRawResult();
353		}
354
355		/**
356	<	* Forks both tasks, returning when {@code isDone} holds for
357	<	* both of them or an exception is encountered. This method may be
358	<	* invoked only from within ForkJoinTask computations. Attempts to
359	<	* invoke in other contexts result in exceptions or errors
360	<	* possibly including ClassCastException.
361	<	* @param t1 one task
362	<	* @param t2 the other task
363	<	* @throws NullPointerException if t1 or t2 are null
364	<	* @throws RuntimeException or Error if either task did so.
356	>	* Forks the given tasks, returning when {@code isDone} holds for
357	>	* each task or an (unchecked) exception is encountered, in which
358	>	* case the exception is rethrown. If more than one task
359	>	* encounters an exception, then this method throws any one of
360	>	* these exceptions. If any task encounters an exception, the
361	>	* other may be cancelled. However, the execution status of
362	>	* individual tasks is not guaranteed upon exceptional return. The
363	>	* status of each task may be obtained using {@link
364	>	* #getException()} and related methods to check if they have been
365	>	* cancelled, completed normally or exceptionally, or left
366	>	* unprocessed.
367	>	*
368	>	* <p>This method may be invoked only from within {@code
369	>	* ForkJoinTask} computations (as may be determined using method
370	>	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
371	>	* result in exceptions or errors, possibly including {@code
372	>	* ClassCastException}.
373	>	*
374	>	* @param t1 the first task
375	>	* @param t2 the second task
376	>	* @throws NullPointerException if any task is null
377		*/
378	<	public static void invokeAll(ForkJoinTask<?>t1, ForkJoinTask<?> t2) {
378	>	public static void invokeAll(ForkJoinTask<?> t1, ForkJoinTask<?> t2) {
379		t2.fork();
380		t1.invoke();
381		t2.join();
382		}
383
384		/**
385	<	* Forks the given tasks, returning when {@code isDone} holds
386	<	* for all of them. If any task encounters an exception, others
387	<	* may be cancelled.  This method may be invoked only from within
388	<	* ForkJoinTask computations. Attempts to invoke in other contexts
389	<	* result in exceptions or errors possibly including ClassCastException.
390	<	* @param tasks the array of tasks
391	<	* @throws NullPointerException if tasks or any element are null.
392	<	* @throws RuntimeException or Error if any task did so.
385	>	* Forks the given tasks, returning when {@code isDone} holds for
386	>	* each task or an (unchecked) exception is encountered, in which
387	>	* case the exception is rethrown. If more than one task
388	>	* encounters an exception, then this method throws any one of
389	>	* these exceptions. If any task encounters an exception, others
390	>	* may be cancelled. However, the execution status of individual
391	>	* tasks is not guaranteed upon exceptional return. The status of
392	>	* each task may be obtained using {@link #getException()} and
393	>	* related methods to check if they have been cancelled, completed
394	>	* normally or exceptionally, or left unprocessed.
395	>	*
396	>	* <p>This method may be invoked only from within {@code
397	>	* ForkJoinTask} computations (as may be determined using method
398	>	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
399	>	* result in exceptions or errors, possibly including {@code
400	>	* ClassCastException}.
401	>	*
402	>	* @param tasks the tasks
403	>	* @throws NullPointerException if any task is null
404		*/
405		public static void invokeAll(ForkJoinTask<?>... tasks) {
406		Throwable ex = null;
#	Line 550 | Line 415 | public abstract class ForkJoinTask<V> im
415		t.fork();
416		else {
417		t.quietlyInvoke();
418	<	if (ex == null)
418	>	if (ex == null && t.status < NORMAL)
419		ex = t.getException();
420		}
421		}
#	Line 561 | Line 426 | public abstract class ForkJoinTask<V> im
426		t.cancel(false);
427		else {
428		t.quietlyJoin();
429	<	if (ex == null)
429	>	if (ex == null && t.status < NORMAL)
430		ex = t.getException();
431		}
432		}
433		}
434		if (ex != null)
435	<	rethrowException(ex);
435	>	UNSAFE.throwException(ex);
436		}
437
438		/**
439	<	* Forks all tasks in the collection, returning when
440	<	* {@code isDone} holds for all of them. If any task
441	<	* encounters an exception, others may be cancelled.  This method
442	<	* may be invoked only from within ForkJoinTask
443	<	* computations. Attempts to invoke in other contexts result in
444	<	* exceptions or errors possibly including ClassCastException.
439	>	* Forks all tasks in the specified collection, returning when
440	>	* {@code isDone} holds for each task or an (unchecked) exception
441	>	* is encountered, in which case the exception is rethrown. If
442	>	* more than one task encounters an exception, then this method
443	>	* throws any one of these exceptions. If any task encounters an
444	>	* exception, others may be cancelled. However, the execution
445	>	* status of individual tasks is not guaranteed upon exceptional
446	>	* return. The status of each task may be obtained using {@link
447	>	* #getException()} and related methods to check if they have been
448	>	* cancelled, completed normally or exceptionally, or left
449	>	* unprocessed.
450	>	*
451	>	* <p>This method may be invoked only from within {@code
452	>	* ForkJoinTask} computations (as may be determined using method
453	>	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
454	>	* result in exceptions or errors, possibly including {@code
455	>	* ClassCastException}.
456	>	*
457		* @param tasks the collection of tasks
458	<	* @throws NullPointerException if tasks or any element are null.
459	<	* @throws RuntimeException or Error if any task did so.
458	>	* @return the tasks argument, to simplify usage
459	>	* @throws NullPointerException if tasks or any element are null
460		*/
461	<	public static void invokeAll(Collection<? extends ForkJoinTask<?>> tasks) {
462	<	if (!(tasks instanceof List)) {
463	<	invokeAll(tasks.toArray(new ForkJoinTask[tasks.size()]));
464	<	return;
461	>	public static <T extends ForkJoinTask<?>> Collection<T> invokeAll(Collection<T> tasks) {
462	>	if (!(tasks instanceof RandomAccess) || !(tasks instanceof List<?>)) {
463	>	invokeAll(tasks.toArray(new ForkJoinTask<?>[tasks.size()]));
464	>	return tasks;
465		}
466	+	@SuppressWarnings("unchecked")
467		List<? extends ForkJoinTask<?>> ts =
468	<	(List<? extends ForkJoinTask<?>>)tasks;
468	>	(List<? extends ForkJoinTask<?>>) tasks;
469		Throwable ex = null;
470		int last = ts.size() - 1;
471		for (int i = last; i >= 0; --i) {
#	Line 600 | Line 478 | public abstract class ForkJoinTask<V> im
478		t.fork();
479		else {
480		t.quietlyInvoke();
481	<	if (ex == null)
481	>	if (ex == null && t.status < NORMAL)
482		ex = t.getException();
483		}
484		}
#	Line 611 | Line 489 | public abstract class ForkJoinTask<V> im
489		t.cancel(false);
490		else {
491		t.quietlyJoin();
492	<	if (ex == null)
492	>	if (ex == null && t.status < NORMAL)
493		ex = t.getException();
494		}
495		}
496		}
497		if (ex != null)
498	<	rethrowException(ex);
499	<	}
622	<
623	<	/**
624	<	* Returns true if the computation performed by this task has
625	<	* completed (or has been cancelled).
626	<	* @return true if this computation has completed
627	<	*/
628	<	public final boolean isDone() {
629	<	return status < 0;
630	<	}
631	<
632	<	/**
633	<	* Returns true if this task was cancelled.
634	<	* @return true if this task was cancelled
635	<	*/
636	<	public final boolean isCancelled() {
637	<	return (status & COMPLETION_MASK) == CANCELLED;
498	>	UNSAFE.throwException(ex);
499	>	return tasks;
500		}
501
502		/**
503	<	* Asserts that the results of this task's computation will not be
504	<	* used. If a cancellation occurs before attempting to execute this
505	<	* task, then execution will be suppressed, {@code isCancelled}
506	<	* will report true, and {@code join} will result in a
507	<	* {@code CancellationException} being thrown. Otherwise, when
508	<	* cancellation races with completion, there are no guarantees
509	<	* about whether {@code isCancelled} will report true, whether
648	<	* {@code join} will return normally or via an exception, or
649	<	* whether these behaviors will remain consistent upon repeated
650	<	* invocation.
503	>	* Attempts to cancel execution of this task. This attempt will
504	>	* fail if the task has already completed, has already been
505	>	* cancelled, or could not be cancelled for some other reason. If
506	>	* successful, and this task has not started when cancel is
507	>	* called, execution of this task is suppressed, {@link
508	>	* #isCancelled} will report true, and {@link #join} will result
509	>	* in a {@code CancellationException} being thrown.
510		*
511		* <p>This method may be overridden in subclasses, but if so, must
512		* still ensure that these minimal properties hold. In particular,
513	<	* the cancel method itself must not throw exceptions.
513	>	* the {@code cancel} method itself must not throw exceptions.
514		*
515	<	* <p> This method is designed to be invoked by <em>other</em>
515	>	* <p>This method is designed to be invoked by <em>other</em>
516		* tasks. To terminate the current task, you can just return or
517		* throw an unchecked exception from its computation method, or
518	<	* invoke {@code completeExceptionally}.
518	>	* invoke {@link #completeExceptionally}.
519		*
520		* @param mayInterruptIfRunning this value is ignored in the
521	<	* default implementation because tasks are not in general
522	<	* cancelled via interruption.
521	>	* default implementation because tasks are not
522	>	* cancelled via interruption
523		*
524	<	* @return true if this task is now cancelled
524	>	* @return {@code true} if this task is now cancelled
525		*/
526		public boolean cancel(boolean mayInterruptIfRunning) {
527		setCompletion(CANCELLED);
528	<	return (status & COMPLETION_MASK) == CANCELLED;
528	>	return status == CANCELLED;
529	>	}
530	>
531	>	/**
532	>	* Cancels, ignoring any exceptions thrown by cancel. Used during
533	>	* worker and pool shutdown. Cancel is spec'ed not to throw any
534	>	* exceptions, but if it does anyway, we have no recourse during
535	>	* shutdown, so guard against this case.
536	>	*/
537	>	final void cancelIgnoringExceptions() {
538	>	try {
539	>	cancel(false);
540	>	} catch (Throwable ignore) {
541	>	}
542		}
543
544		/**
545	<	* Returns true if this task threw an exception or was cancelled
546	<	* @return true if this task threw an exception or was cancelled
545	>	* Cancels if current thread is a terminating worker thread,
546	>	* ignoring any exceptions thrown by cancel.
547	>	*/
548	>	final void cancelIfTerminating() {
549	>	Thread t = Thread.currentThread();
550	>	if ((t instanceof ForkJoinWorkerThread) &&
551	>	((ForkJoinWorkerThread) t).isTerminating()) {
552	>	try {
553	>	cancel(false);
554	>	} catch (Throwable ignore) {
555	>	}
556	>	}
557	>	}
558	>
559	>	public final boolean isDone() {
560	>	return status < 0;
561	>	}
562	>
563	>	public final boolean isCancelled() {
564	>	return status == CANCELLED;
565	>	}
566	>
567	>	/**
568	>	* Returns {@code true} if this task threw an exception or was cancelled.
569	>	*
570	>	* @return {@code true} if this task threw an exception or was cancelled
571		*/
572		public final boolean isCompletedAbnormally() {
573	<	return (status & COMPLETION_MASK) < NORMAL;
573	>	return status < NORMAL;
574	>	}
575	>
576	>	/**
577	>	* Returns {@code true} if this task completed without throwing an
578	>	* exception and was not cancelled.
579	>	*
580	>	* @return {@code true} if this task completed without throwing an
581	>	* exception and was not cancelled
582	>	*/
583	>	public final boolean isCompletedNormally() {
584	>	return status == NORMAL;
585		}
586
587		/**
588		* Returns the exception thrown by the base computation, or a
589	<	* CancellationException if cancelled, or null if none or if the
590	<	* method has not yet completed.
591	<	* @return the exception, or null if none
589	>	* {@code CancellationException} if cancelled, or {@code null} if
590	>	* none or if the method has not yet completed.
591	>	*
592	>	* @return the exception, or {@code null} if none
593		*/
594		public final Throwable getException() {
595	<	int s = status & COMPLETION_MASK;
596	<	if (s >= NORMAL)
597	<	return null;
598	<	if (s == CANCELLED)
691	<	return new CancellationException();
692	<	return exceptionMap.get(this);
595	>	int s = status;
596	>	return ((s >= NORMAL)    ? null :
597	>	(s == CANCELLED) ? new CancellationException() :
598	>	exceptionMap.get(this));
599		}
600
601		/**
#	Line 698 | Line 604 | public abstract class ForkJoinTask<V> im
604		* {@code join} and related operations. This method may be used
605		* to induce exceptions in asynchronous tasks, or to force
606		* completion of tasks that would not otherwise complete.  Its use
607	<	* in other situations is likely to be wrong.  This method is
607	>	* in other situations is discouraged.  This method is
608		* overridable, but overridden versions must invoke {@code super}
609		* implementation to maintain guarantees.
610		*
611	<	* @param ex the exception to throw. If this exception is
612	<	* not a RuntimeException or Error, the actual exception thrown
613	<	* will be a RuntimeException with cause ex.
611	>	* @param ex the exception to throw. If this exception is not a
612	>	* {@code RuntimeException} or {@code Error}, the actual exception
613	>	* thrown will be a {@code RuntimeException} with cause {@code ex}.
614		*/
615		public void completeExceptionally(Throwable ex) {
616	<	setDoneExceptionally((ex instanceof RuntimeException) ||
617	<	(ex instanceof Error)? ex :
618	<	new RuntimeException(ex));
616	>	setExceptionalCompletion((ex instanceof RuntimeException) ||
617	>	(ex instanceof Error) ? ex :
618	>	new RuntimeException(ex));
619		}
620
621		/**
622		* Completes this task, and if not already aborted or cancelled,
623	<	* returning a {@code null} result upon {@code join} and related
624	<	* operations. This method may be used to provide results for
625	<	* asynchronous tasks, or to provide alternative handling for
626	<	* tasks that would not otherwise complete normally. Its use in
627	<	* other situations is likely to be wrong. This method is
628	<	* overridable, but overridden versions must invoke {@code super}
629	<	* implementation to maintain guarantees.
623	>	* returning the given value as the result of subsequent
624	>	* invocations of {@code join} and related operations. This method
625	>	* may be used to provide results for asynchronous tasks, or to
626	>	* provide alternative handling for tasks that would not otherwise
627	>	* complete normally. Its use in other situations is
628	>	* discouraged. This method is overridable, but overridden
629	>	* versions must invoke {@code super} implementation to maintain
630	>	* guarantees.
631		*
632	<	* @param value the result value for this task.
632	>	* @param value the result value for this task
633		*/
634		public void complete(V value) {
635		try {
636		setRawResult(value);
637	<	} catch(Throwable rex) {
638	<	setDoneExceptionally(rex);
637	>	} catch (Throwable rex) {
638	>	setExceptionalCompletion(rex);
639		return;
640		}
641	<	setNormalCompletion();
735	<	}
736	<
737	<	public final V get() throws InterruptedException, ExecutionException {
738	<	ForkJoinWorkerThread w = getWorker();
739	<	if (w == null || status < 0 || !w.unpushTask(this) || !tryQuietlyInvoke())
740	<	awaitDone(w, true);
741	<	return reportFutureResult();
742	<	}
743	<
744	<	public final V get(long timeout, TimeUnit unit)
745	<	throws InterruptedException, ExecutionException, TimeoutException {
746	<	ForkJoinWorkerThread w = getWorker();
747	<	if (w == null || status < 0 || !w.unpushTask(this) || !tryQuietlyInvoke())
748	<	awaitDone(w, unit.toNanos(timeout));
749	<	return reportTimedFutureResult();
641	>	setCompletion(NORMAL);
642		}
643
644		/**
645	<	* Possibly executes other tasks until this task is ready, then
646	<	* returns the result of the computation.  This method may be more
647	<	* efficient than {@code join}, but is only applicable when
756	<	* there are no potential dependencies between continuation of the
757	<	* current task and that of any other task that might be executed
758	<	* while helping. (This usually holds for pure divide-and-conquer
759	<	* tasks). This method may be invoked only from within
760	<	* ForkJoinTask computations. Attempts to invoke in other contexts
761	<	* result in exceptions or errors possibly including ClassCastException.
645	>	* Waits if necessary for the computation to complete, and then
646	>	* retrieves its result.
647	>	*
648		* @return the computed result
649	+	* @throws CancellationException if the computation was cancelled
650	+	* @throws ExecutionException if the computation threw an
651	+	* exception
652	+	* @throws InterruptedException if the current thread is not a
653	+	* member of a ForkJoinPool and was interrupted while waiting
654		*/
655	<	public final V helpJoin() {
656	<	ForkJoinWorkerThread w = (ForkJoinWorkerThread)(Thread.currentThread());
657	<	if (status < 0 || !w.unpushTask(this) || !tryExec())
658	<	reportException(busyJoin(w));
655	>	public final V get() throws InterruptedException, ExecutionException {
656	>	int s;
657	>	if (Thread.currentThread() instanceof ForkJoinWorkerThread) {
658	>	quietlyJoin();
659	>	s = status;
660	>	}
661	>	else {
662	>	while ((s = status) >= 0) {
663	>	synchronized (this) { // interruptible form of awaitDone
664	>	if (UNSAFE.compareAndSwapInt(this, statusOffset,
665	>	s, SIGNAL)) {
666	>	while (status >= 0)
667	>	wait();
668	>	}
669	>	}
670	>	}
671	>	}
672	>	if (s < NORMAL) {
673	>	Throwable ex;
674	>	if (s == CANCELLED)
675	>	throw new CancellationException();
676	>	if (s == EXCEPTIONAL && (ex = exceptionMap.get(this)) != null)
677	>	throw new ExecutionException(ex);
678	>	}
679		return getRawResult();
680		}
681
682		/**
683	<	* Possibly executes other tasks until this task is ready.  This
684	<	* method may be invoked only from within ForkJoinTask
685	<	* computations. Attempts to invoke in other contexts result in
686	<	* exceptions or errors possibly including ClassCastException.
683	>	* Waits if necessary for at most the given time for the computation
684	>	* to complete, and then retrieves its result, if available.
685	>	*
686	>	* @param timeout the maximum time to wait
687	>	* @param unit the time unit of the timeout argument
688	>	* @return the computed result
689	>	* @throws CancellationException if the computation was cancelled
690	>	* @throws ExecutionException if the computation threw an
691	>	* exception
692	>	* @throws InterruptedException if the current thread is not a
693	>	* member of a ForkJoinPool and was interrupted while waiting
694	>	* @throws TimeoutException if the wait timed out
695		*/
696	<	public final void quietlyHelpJoin() {
697	<	if (status >= 0) {
698	<	ForkJoinWorkerThread w =
699	<	(ForkJoinWorkerThread)(Thread.currentThread());
700	<	if (!w.unpushTask(this) || !tryQuietlyInvoke())
701	<	busyJoin(w);
696	>	public final V get(long timeout, TimeUnit unit)
697	>	throws InterruptedException, ExecutionException, TimeoutException {
698	>	Thread t = Thread.currentThread();
699	>	ForkJoinPool pool;
700	>	if (t instanceof ForkJoinWorkerThread) {
701	>	ForkJoinWorkerThread w = (ForkJoinWorkerThread) t;
702	>	if (status >= 0 && w.unpushTask(this))
703	>	quietlyExec();
704	>	pool = w.pool;
705	>	}
706	>	else
707	>	pool = null;
708	>	/*
709	>	* Timed wait loop intermixes cases for FJ (pool != null) and
710	>	* non FJ threads. For FJ, decrement pool count but don't try
711	>	* for replacement; increment count on completion. For non-FJ,
712	>	* deal with interrupts. This is messy, but a little less so
713	>	* than is splitting the FJ and nonFJ cases.
714	>	*/
715	>	boolean interrupted = false;
716	>	boolean dec = false; // true if pool count decremented
717	>	long nanos = unit.toNanos(timeout);
718	>	for (;;) {
719	>	if (pool == null && Thread.interrupted()) {
720	>	interrupted = true;
721	>	break;
722	>	}
723	>	int s = status;
724	>	if (s < 0)
725	>	break;
726	>	if (UNSAFE.compareAndSwapInt(this, statusOffset, s, SIGNAL)) {
727	>	long startTime = System.nanoTime();
728	>	long nt; // wait time
729	>	while (status >= 0 &&
730	>	(nt = nanos - (System.nanoTime() - startTime)) > 0) {
731	>	if (pool != null && !dec)
732	>	dec = pool.tryDecrementRunningCount();
733	>	else {
734	>	long ms = nt / 1000000;
735	>	int ns = (int) (nt % 1000000);
736	>	try {
737	>	synchronized (this) {
738	>	if (status >= 0)
739	>	wait(ms, ns);
740	>	}
741	>	} catch (InterruptedException ie) {
742	>	if (pool != null)
743	>	cancelIfTerminating();
744	>	else {
745	>	interrupted = true;
746	>	break;
747	>	}
748	>	}
749	>	}
750	>	}
751	>	break;
752	>	}
753	>	}
754	>	if (pool != null && dec)
755	>	pool.incrementRunningCount();
756	>	if (interrupted)
757	>	throw new InterruptedException();
758	>	int es = status;
759	>	if (es != NORMAL) {
760	>	Throwable ex;
761	>	if (es == CANCELLED)
762	>	throw new CancellationException();
763	>	if (es == EXCEPTIONAL && (ex = exceptionMap.get(this)) != null)
764	>	throw new ExecutionException(ex);
765	>	throw new TimeoutException();
766		}
767	+	return getRawResult();
768		}
769
770		/**
771	<	* Joins this task, without returning its result or throwing an
771	>	* Joins this task, without returning its result or throwing its
772		* exception. This method may be useful when processing
773		* collections of tasks when some have been cancelled or otherwise
774		* known to have aborted.
775		*/
776		public final void quietlyJoin() {
777	<	if (status >= 0) {
778	<	ForkJoinWorkerThread w = getWorker();
779	<	if (w == null || !w.unpushTask(this) || !tryQuietlyInvoke())
780	<	awaitDone(w, true);
777	>	Thread t;
778	>	if ((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) {
779	>	ForkJoinWorkerThread w = (ForkJoinWorkerThread) t;
780	>	if (status >= 0) {
781	>	if (w.unpushTask(this)) {
782	>	boolean completed;
783	>	try {
784	>	completed = exec();
785	>	} catch (Throwable rex) {
786	>	setExceptionalCompletion(rex);
787	>	return;
788	>	}
789	>	if (completed) {
790	>	setCompletion(NORMAL);
791	>	return;
792	>	}
793	>	}
794	>	w.joinTask(this);
795	>	}
796		}
797	+	else
798	+	externalAwaitDone();
799		}
800
801		/**
802		* Commences performing this task and awaits its completion if
803	<	* necessary, without returning its result or throwing an
804	<	* exception. This method may be useful when processing
804	<	* collections of tasks when some have been cancelled or otherwise
805	<	* known to have aborted.
803	>	* necessary, without returning its result or throwing its
804	>	* exception.
805		*/
806		public final void quietlyInvoke() {
807	<	if (status >= 0 && !tryQuietlyInvoke())
808	<	quietlyJoin();
807	>	if (status >= 0) {
808	>	boolean completed;
809	>	try {
810	>	completed = exec();
811	>	} catch (Throwable rex) {
812	>	setExceptionalCompletion(rex);
813	>	return;
814	>	}
815	>	if (completed)
816	>	setCompletion(NORMAL);
817	>	else
818	>	quietlyJoin();
819	>	}
820		}
821
822		/**
823		* Possibly executes tasks until the pool hosting the current task
824	<	* {@link ForkJoinPool#isQuiescent}. This method may be of use in
825	<	* designs in which many tasks are forked, but none are explicitly
826	<	* joined, instead executing them until all are processed.
824	>	* {@link ForkJoinPool#isQuiescent is quiescent}. This method may
825	>	* be of use in designs in which many tasks are forked, but none
826	>	* are explicitly joined, instead executing them until all are
827	>	* processed.
828	>	*
829	>	* <p>This method may be invoked only from within {@code
830	>	* ForkJoinTask} computations (as may be determined using method
831	>	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
832	>	* result in exceptions or errors, possibly including {@code
833	>	* ClassCastException}.
834		*/
835		public static void helpQuiesce() {
836	<	((ForkJoinWorkerThread)(Thread.currentThread())).
837	<	helpQuiescePool();
836	>	((ForkJoinWorkerThread) Thread.currentThread())
837	>	.helpQuiescePool();
838		}
839
840		/**
#	Line 826 | Line 843 | public abstract class ForkJoinTask<V> im
843		* this task, but only if reuse occurs when this task has either
844		* never been forked, or has been forked, then completed and all
845		* outstanding joins of this task have also completed. Effects
846	<	* under any other usage conditions are not guaranteed, and are
847	<	* almost surely wrong. This method may be useful when executing
846	>	* under any other usage conditions are not guaranteed.
847	>	* This method may be useful when executing
848		* pre-constructed trees of subtasks in loops.
849		*/
850		public void reinitialize() {
851	<	if ((status & COMPLETION_MASK) == EXCEPTIONAL)
851	>	if (status == EXCEPTIONAL)
852		exceptionMap.remove(this);
853		status = 0;
854		}
855
856		/**
857		* Returns the pool hosting the current task execution, or null
858	<	* if this task is executing outside of any pool.
859	<	* @return the pool, or null if none.
858	>	* if this task is executing outside of any ForkJoinPool.
859	>	*
860	>	* @see #inForkJoinPool
861	>	* @return the pool, or {@code null} if none
862		*/
863		public static ForkJoinPool getPool() {
864		Thread t = Thread.currentThread();
865	<	return ((t instanceof ForkJoinWorkerThread)?
866	<	((ForkJoinWorkerThread)t).pool : null);
865	>	return (t instanceof ForkJoinWorkerThread) ?
866	>	((ForkJoinWorkerThread) t).pool : null;
867	>	}
868	>
869	>	/**
870	>	* Returns {@code true} if the current thread is executing as a
871	>	* ForkJoinPool computation.
872	>	*
873	>	* @return {@code true} if the current thread is executing as a
874	>	* ForkJoinPool computation, or false otherwise
875	>	*/
876	>	public static boolean inForkJoinPool() {
877	>	return Thread.currentThread() instanceof ForkJoinWorkerThread;
878		}
879
880		/**
#	Line 853 | Line 883 | public abstract class ForkJoinTask<V> im
883		* by the current thread, and has not commenced executing in
884		* another thread.  This method may be useful when arranging
885		* alternative local processing of tasks that could have been, but
886	<	* were not, stolen. This method may be invoked only from within
887	<	* ForkJoinTask computations. Attempts to invoke in other contexts
888	<	* result in exceptions or errors possibly including ClassCastException.
889	<	* @return true if unforked
886	>	* were not, stolen.
887	>	*
888	>	* <p>This method may be invoked only from within {@code
889	>	* ForkJoinTask} computations (as may be determined using method
890	>	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
891	>	* result in exceptions or errors, possibly including {@code
892	>	* ClassCastException}.
893	>	*
894	>	* @return {@code true} if unforked
895		*/
896		public boolean tryUnfork() {
897	<	return ((ForkJoinWorkerThread)(Thread.currentThread())).unpushTask(this);
897	>	return ((ForkJoinWorkerThread) Thread.currentThread())
898	>	.unpushTask(this);
899		}
900
901		/**
#	Line 867 | Line 903 | public abstract class ForkJoinTask<V> im
903		* forked by the current worker thread but not yet executed. This
904		* value may be useful for heuristic decisions about whether to
905		* fork other tasks.
906	+	*
907	+	* <p>This method may be invoked only from within {@code
908	+	* ForkJoinTask} computations (as may be determined using method
909	+	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
910	+	* result in exceptions or errors, possibly including {@code
911	+	* ClassCastException}.
912	+	*
913		* @return the number of tasks
914		*/
915		public static int getQueuedTaskCount() {
916	<	return ((ForkJoinWorkerThread)(Thread.currentThread())).
917	<	getQueueSize();
916	>	return ((ForkJoinWorkerThread) Thread.currentThread())
917	>	.getQueueSize();
918		}
919
920		/**
921	<	* Returns a estimate of how many more locally queued tasks are
921	>	* Returns an estimate of how many more locally queued tasks are
922		* held by the current worker thread than there are other worker
923		* threads that might steal them.  This value may be useful for
924		* heuristic decisions about whether to fork other tasks. In many
#	Line 883 | Line 926 | public abstract class ForkJoinTask<V> im
926		* aim to maintain a small constant surplus (for example, 3) of
927		* tasks, and to process computations locally if this threshold is
928		* exceeded.
929	+	*
930	+	* <p>This method may be invoked only from within {@code
931	+	* ForkJoinTask} computations (as may be determined using method
932	+	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
933	+	* result in exceptions or errors, possibly including {@code
934	+	* ClassCastException}.
935	+	*
936		* @return the surplus number of tasks, which may be negative
937		*/
938		public static int getSurplusQueuedTaskCount() {
939	<	return ((ForkJoinWorkerThread)(Thread.currentThread()))
939	>	return ((ForkJoinWorkerThread) Thread.currentThread())
940		.getEstimatedSurplusTaskCount();
941		}
942
943		// Extension methods
944
945		/**
946	<	* Returns the result that would be returned by {@code join},
947	<	* even if this task completed abnormally, or null if this task is
948	<	* not known to have been completed.  This method is designed to
949	<	* aid debugging, as well as to support extensions. Its use in any
950	<	* other context is discouraged.
946	>	* Returns the result that would be returned by {@link #join}, even
947	>	* if this task completed abnormally, or {@code null} if this task
948	>	* is not known to have been completed.  This method is designed
949	>	* to aid debugging, as well as to support extensions. Its use in
950	>	* any other context is discouraged.
951		*
952	<	* @return the result, or null if not completed.
952	>	* @return the result, or {@code null} if not completed
953		*/
954		public abstract V getRawResult();
955
#	Line 918 | Line 968 | public abstract class ForkJoinTask<V> im
968		* called otherwise. The return value controls whether this task
969		* is considered to be done normally. It may return false in
970		* asynchronous actions that require explicit invocations of
971	<	* {@code complete} to become joinable. It may throw exceptions
972	<	* to indicate abnormal exit.
973	<	* @return true if completed normally
974	<	* @throws Error or RuntimeException if encountered during computation
971	>	* {@link #complete} to become joinable. It may also throw an
972	>	* (unchecked) exception to indicate abnormal exit.
973	>	*
974	>	* @return {@code true} if completed normally
975		*/
976		protected abstract boolean exec();
977
978		/**
979	<	* Returns, but does not unschedule or execute, the task queued by
980	<	* the current thread but not yet executed, if one is
979	>	* Returns, but does not unschedule or execute, a task queued by
980	>	* the current thread but not yet executed, if one is immediately
981		* available. There is no guarantee that this task will actually
982	<	* be polled or executed next.  This method is designed primarily
983	<	* to support extensions, and is unlikely to be useful otherwise.
984	<	* This method may be invoked only from within ForkJoinTask
985	<	* computations. Attempts to invoke in other contexts result in
986	<	* exceptions or errors possibly including ClassCastException.
982	>	* be polled or executed next. Conversely, this method may return
983	>	* null even if a task exists but cannot be accessed without
984	>	* contention with other threads.  This method is designed
985	>	* primarily to support extensions, and is unlikely to be useful
986	>	* otherwise.
987		*
988	<	* @return the next task, or null if none are available
988	>	* <p>This method may be invoked only from within {@code
989	>	* ForkJoinTask} computations (as may be determined using method
990	>	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
991	>	* result in exceptions or errors, possibly including {@code
992	>	* ClassCastException}.
993	>	*
994	>	* @return the next task, or {@code null} if none are available
995		*/
996		protected static ForkJoinTask<?> peekNextLocalTask() {
997	<	return ((ForkJoinWorkerThread)(Thread.currentThread())).peekTask();
997	>	return ((ForkJoinWorkerThread) Thread.currentThread())
998	>	.peekTask();
999		}
1000
1001		/**
1002		* Unschedules and returns, without executing, the next task
1003		* queued by the current thread but not yet executed.  This method
1004		* is designed primarily to support extensions, and is unlikely to
1005	<	* be useful otherwise.  This method may be invoked only from
1006	<	* within ForkJoinTask computations. Attempts to invoke in other
1007	<	* contexts result in exceptions or errors possibly including
1008	<	* ClassCastException.
1005	>	* be useful otherwise.
1006	>	*
1007	>	* <p>This method may be invoked only from within {@code
1008	>	* ForkJoinTask} computations (as may be determined using method
1009	>	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
1010	>	* result in exceptions or errors, possibly including {@code
1011	>	* ClassCastException}.
1012		*
1013	<	* @return the next task, or null if none are available
1013	>	* @return the next task, or {@code null} if none are available
1014		*/
1015		protected static ForkJoinTask<?> pollNextLocalTask() {
1016	<	return ((ForkJoinWorkerThread)(Thread.currentThread())).pollLocalTask();
1016	>	return ((ForkJoinWorkerThread) Thread.currentThread())
1017	>	.pollLocalTask();
1018		}
1019
1020		/**
#	Line 964 | Line 1025 | public abstract class ForkJoinTask<V> im
1025		* {@code null} result does not necessarily imply quiescence
1026		* of the pool this task is operating in.  This method is designed
1027		* primarily to support extensions, and is unlikely to be useful
1028	<	* otherwise.  This method may be invoked only from within
1029	<	* ForkJoinTask computations. Attempts to invoke in other contexts
1030	<	* result in exceptions or errors possibly including
1031	<	* ClassCastException.
1028	>	* otherwise.
1029	>	*
1030	>	* <p>This method may be invoked only from within {@code
1031	>	* ForkJoinTask} computations (as may be determined using method
1032	>	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
1033	>	* result in exceptions or errors, possibly including {@code
1034	>	* ClassCastException}.
1035		*
1036	<	* @return a task, or null if none are available
1036	>	* @return a task, or {@code null} if none are available
1037		*/
1038		protected static ForkJoinTask<?> pollTask() {
1039	<	return ((ForkJoinWorkerThread)(Thread.currentThread())).
1040	<	pollTask();
1039	>	return ((ForkJoinWorkerThread) Thread.currentThread())
1040	>	.pollTask();
1041	>	}
1042	>
1043	>	/**
1044	>	* Adaptor for Runnables. This implements RunnableFuture
1045	>	* to be compliant with AbstractExecutorService constraints
1046	>	* when used in ForkJoinPool.
1047	>	*/
1048	>	static final class AdaptedRunnable<T> extends ForkJoinTask<T>
1049	>	implements RunnableFuture<T> {
1050	>	final Runnable runnable;
1051	>	final T resultOnCompletion;
1052	>	T result;
1053	>	AdaptedRunnable(Runnable runnable, T result) {
1054	>	if (runnable == null) throw new NullPointerException();
1055	>	this.runnable = runnable;
1056	>	this.resultOnCompletion = result;
1057	>	}
1058	>	public T getRawResult() { return result; }
1059	>	public void setRawResult(T v) { result = v; }
1060	>	public boolean exec() {
1061	>	runnable.run();
1062	>	result = resultOnCompletion;
1063	>	return true;
1064	>	}
1065	>	public void run() { invoke(); }
1066	>	private static final long serialVersionUID = 5232453952276885070L;
1067	>	}
1068	>
1069	>	/**
1070	>	* Adaptor for Callables
1071	>	*/
1072	>	static final class AdaptedCallable<T> extends ForkJoinTask<T>
1073	>	implements RunnableFuture<T> {
1074	>	final Callable<? extends T> callable;
1075	>	T result;
1076	>	AdaptedCallable(Callable<? extends T> callable) {
1077	>	if (callable == null) throw new NullPointerException();
1078	>	this.callable = callable;
1079	>	}
1080	>	public T getRawResult() { return result; }
1081	>	public void setRawResult(T v) { result = v; }
1082	>	public boolean exec() {
1083	>	try {
1084	>	result = callable.call();
1085	>	return true;
1086	>	} catch (Error err) {
1087	>	throw err;
1088	>	} catch (RuntimeException rex) {
1089	>	throw rex;
1090	>	} catch (Exception ex) {
1091	>	throw new RuntimeException(ex);
1092	>	}
1093	>	}
1094	>	public void run() { invoke(); }
1095	>	private static final long serialVersionUID = 2838392045355241008L;
1096	>	}
1097	>
1098	>	/**
1099	>	* Returns a new {@code ForkJoinTask} that performs the {@code run}
1100	>	* method of the given {@code Runnable} as its action, and returns
1101	>	* a null result upon {@link #join}.
1102	>	*
1103	>	* @param runnable the runnable action
1104	>	* @return the task
1105	>	*/
1106	>	public static ForkJoinTask<?> adapt(Runnable runnable) {
1107	>	return new AdaptedRunnable<Void>(runnable, null);
1108	>	}
1109	>
1110	>	/**
1111	>	* Returns a new {@code ForkJoinTask} that performs the {@code run}
1112	>	* method of the given {@code Runnable} as its action, and returns
1113	>	* the given result upon {@link #join}.
1114	>	*
1115	>	* @param runnable the runnable action
1116	>	* @param result the result upon completion
1117	>	* @return the task
1118	>	*/
1119	>	public static <T> ForkJoinTask<T> adapt(Runnable runnable, T result) {
1120	>	return new AdaptedRunnable<T>(runnable, result);
1121	>	}
1122	>
1123	>	/**
1124	>	* Returns a new {@code ForkJoinTask} that performs the {@code call}
1125	>	* method of the given {@code Callable} as its action, and returns
1126	>	* its result upon {@link #join}, translating any checked exceptions
1127	>	* encountered into {@code RuntimeException}.
1128	>	*
1129	>	* @param callable the callable action
1130	>	* @return the task
1131	>	*/
1132	>	public static <T> ForkJoinTask<T> adapt(Callable<? extends T> callable) {
1133	>	return new AdaptedCallable<T>(callable);
1134		}
1135
1136		// Serialization support
#	Line 981 | Line 1138 | public abstract class ForkJoinTask<V> im
1138		private static final long serialVersionUID = -7721805057305804111L;
1139
1140		/**
1141	<	* Save the state to a stream.
1141	>	* Saves the state to a stream (that is, serializes it).
1142		*
1143		* @serialData the current run status and the exception thrown
1144	<	* during execution, or null if none.
1144	>	* during execution, or {@code null} if none
1145		* @param s the stream
1146		*/
1147		private void writeObject(java.io.ObjectOutputStream s)
#	Line 994 | Line 1151 | public abstract class ForkJoinTask<V> im
1151		}
1152
1153		/**
1154	<	* Reconstitute the instance from a stream.
1154	>	* Reconstitutes the instance from a stream (that is, deserializes it).
1155	>	*
1156		* @param s the stream
1157		*/
1158		private void readObject(java.io.ObjectInputStream s)
1159		throws java.io.IOException, ClassNotFoundException {
1160		s.defaultReadObject();
1003	–	status &= ~INTERNAL_SIGNAL_MASK; // clear internal signal counts
1004	–	status |= EXTERNAL_SIGNAL; // conservatively set external signal
1161		Object ex = s.readObject();
1162		if (ex != null)
1163	<	setDoneExceptionally((Throwable)ex);
1163	>	setExceptionalCompletion((Throwable) ex);
1164		}
1165
1166	<	// Temporary Unsafe mechanics for preliminary release
1167	<	private static Unsafe getUnsafe() throws Throwable {
1166	>	// Unsafe mechanics
1167	>
1168	>	private static final sun.misc.Unsafe UNSAFE = getUnsafe();
1169	>	private static final long statusOffset =
1170	>	objectFieldOffset("status", ForkJoinTask.class);
1171	>
1172	>	private static long objectFieldOffset(String field, Class<?> klazz) {
1173	>	try {
1174	>	return UNSAFE.objectFieldOffset(klazz.getDeclaredField(field));
1175	>	} catch (NoSuchFieldException e) {
1176	>	// Convert Exception to corresponding Error
1177	>	NoSuchFieldError error = new NoSuchFieldError(field);
1178	>	error.initCause(e);
1179	>	throw error;
1180	>	}
1181	>	}
1182	>
1183	>	/**
1184	>	* Returns a sun.misc.Unsafe.  Suitable for use in a 3rd party package.
1185	>	* Replace with a simple call to Unsafe.getUnsafe when integrating
1186	>	* into a jdk.
1187	>	*
1188	>	* @return a sun.misc.Unsafe
1189	>	*/
1190	>	private static sun.misc.Unsafe getUnsafe() {
1191		try {
1192	<	return Unsafe.getUnsafe();
1192	>	return sun.misc.Unsafe.getUnsafe();
1193		} catch (SecurityException se) {
1194		try {
1195		return java.security.AccessController.doPrivileged
1196	<	(new java.security.PrivilegedExceptionAction<Unsafe>() {
1197	<	public Unsafe run() throws Exception {
1198	<	return getUnsafePrivileged();
1196	>	(new java.security
1197	>	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
1198	>	public sun.misc.Unsafe run() throws Exception {
1199	>	java.lang.reflect.Field f = sun.misc
1200	>	.Unsafe.class.getDeclaredField("theUnsafe");
1201	>	f.setAccessible(true);
1202	>	return (sun.misc.Unsafe) f.get(null);
1203		}});
1204		} catch (java.security.PrivilegedActionException e) {
1205	<	throw e.getCause();
1205	>	throw new RuntimeException("Could not initialize intrinsics",
1206	>	e.getCause());
1207		}
1208		}
1209		}
1026	–
1027	–	private static Unsafe getUnsafePrivileged()
1028	–	throws NoSuchFieldException, IllegalAccessException {
1029	–	Field f = Unsafe.class.getDeclaredField("theUnsafe");
1030	–	f.setAccessible(true);
1031	–	return (Unsafe) f.get(null);
1032	–	}
1033	–
1034	–	private static long fieldOffset(String fieldName)
1035	–	throws NoSuchFieldException {
1036	–	return _unsafe.objectFieldOffset
1037	–	(ForkJoinTask.class.getDeclaredField(fieldName));
1038	–	}
1039	–
1040	–	static final Unsafe _unsafe;
1041	–	static final long statusOffset;
1042	–
1043	–	static {
1044	–	try {
1045	–	_unsafe = getUnsafe();
1046	–	statusOffset = fieldOffset("status");
1047	–	} catch (Throwable e) {
1048	–	throw new RuntimeException("Could not initialize intrinsics", e);
1049	–	}
1050	–	}
1051	–
1210		}

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