ViewVC Help

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

root/jsr166/jsr166/src/jsr166y/ForkJoinTask.java

Comparing jsr166/src/jsr166y/ForkJoinTask.java (file contents):
Revision 1.52 by dl, Sat Jul 24 20:28:18 2010 UTC vs.
Revision 1.66 by dl, Sun Oct 24 19:37:26 2010 UTC

#	Line 6 | Line 6
6
7		package jsr166y;
8
9	–	import java.util.concurrent.*;
10	–
9		import java.io.Serializable;
10		import java.util.Collection;
11		import java.util.Collections;
#	Line 15 | Line 13 | import java.util.List;
13		import java.util.RandomAccess;
14		import java.util.Map;
15		import java.util.WeakHashMap;
16	+	import java.util.concurrent.Callable;
17	+	import java.util.concurrent.CancellationException;
18	+	import java.util.concurrent.ExecutionException;
19	+	import java.util.concurrent.Executor;
20	+	import java.util.concurrent.ExecutorService;
21	+	import java.util.concurrent.Future;
22	+	import java.util.concurrent.RejectedExecutionException;
23	+	import java.util.concurrent.RunnableFuture;
24	+	import java.util.concurrent.TimeUnit;
25	+	import java.util.concurrent.TimeoutException;
26
27		/**
28		* Abstract base class for tasks that run within a {@link ForkJoinPool}.
#	Line 28 | Line 36 | import java.util.WeakHashMap;
36		* start other subtasks.  As indicated by the name of this class,
37		* many programs using {@code ForkJoinTask} employ only methods
38		* {@link #fork} and {@link #join}, or derivatives such as {@link
39	<	* #invokeAll}.  However, this class also provides a number of other
40	<	* methods that can come into play in advanced usages, as well as
41	<	* extension mechanics that allow support of new forms of fork/join
42	<	* processing.
39	>	* #invokeAll(ForkJoinTask...) invokeAll}.  However, this class also
40	>	* provides a number of other methods that can come into play in
41	>	* advanced usages, as well as extension mechanics that allow
42	>	* support of new forms of fork/join processing.
43		*
44		* <p>A {@code ForkJoinTask} is a lightweight form of {@link Future}.
45		* The efficiency of {@code ForkJoinTask}s stems from a set of
#	Line 100 | Line 108 | import java.util.WeakHashMap;
108		* ForkJoinTasks (as may be determined using method {@link
109		* #inForkJoinPool}).  Attempts to invoke them in other contexts
110		* result in exceptions or errors, possibly including
111	<	* ClassCastException.
111	>	* {@code ClassCastException}.
112		*
113		* <p>Most base support methods are {@code final}, to prevent
114		* overriding of implementations that are intrinsically tied to the
#	Line 144 | Line 152 | public abstract class ForkJoinTask<V> im
152		* status maintenance (2) execution and awaiting completion (3)
153		* user-level methods that additionally report results. This is
154		* sometimes hard to see because this file orders exported methods
155	<	* in a way that flows well in javadocs.
155	>	* in a way that flows well in javadocs. In particular, most
156	>	* join mechanics are in method quietlyJoin, below.
157		*/
158
159		/*
#	Line 152 | Line 161 | public abstract class ForkJoinTask<V> im
161		* single int to minimize footprint and to ensure atomicity (via
162		* CAS).  Status is initially zero, and takes on nonnegative
163		* values until completed, upon which status holds value
164	<	* COMPLETED. CANCELLED, or EXCEPTIONAL. Tasks undergoing blocking
164	>	* NORMAL, CANCELLED, or EXCEPTIONAL. Tasks undergoing blocking
165		* waits by other threads have the SIGNAL bit set.  Completion of
166		* a stolen task with SIGNAL set awakens any waiters via
167		* notifyAll. Even though suboptimal for some purposes, we use
#	Line 164 | Line 173 | public abstract class ForkJoinTask<V> im
173		* them.
174		*/
175
176	<	/** Run status of this task */
176	>	/** The run status of this task */
177		volatile int status; // accessed directly by pool and workers
178
179		private static final int NORMAL      = -1;
#	Line 191 | Line 200 | public abstract class ForkJoinTask<V> im
200		* also clearing signal request bits.
201		*
202		* @param completion one of NORMAL, CANCELLED, EXCEPTIONAL
194	–	* @return status on exit
203		*/
204	<	private int setCompletion(int completion) {
204	>	private void setCompletion(int completion) {
205		int s;
206		while ((s = status) >= 0) {
207		if (UNSAFE.compareAndSwapInt(this, statusOffset, s, completion)) {
208		if (s != 0)
209		synchronized (this) { notifyAll(); }
210	<	return completion;
210	>	break;
211		}
212		}
205	–	return s;
213		}
214
215		/**
216	<	* Record exception and set exceptional completion
216	>	* Records exception and sets exceptional completion.
217	>	*
218		* @return status on exit
219		*/
220	<	private int setExceptionalCompletion(Throwable rex) {
220	>	private void setExceptionalCompletion(Throwable rex) {
221		exceptionMap.put(this, rex);
222	<	return setCompletion(EXCEPTIONAL);
222	>	setCompletion(EXCEPTIONAL);
223		}
224
225		/**
226	<	* Blocks a worker thread until completion. Called only by pool.
226	>	* Blocks a worker thread until completion. Called only by
227	>	* pool. Currently unused -- pool-based waits use timeout
228	>	* version below.
229		*/
230		final void internalAwaitDone() {
231		int s;         // the odd construction reduces lock bias effects
232		while ((s = status) >= 0) {
233		try {
234	<	synchronized(this) {
234	>	synchronized (this) {
235		if (UNSAFE.compareAndSwapInt(this, statusOffset, s,SIGNAL))
236		wait();
237		}
#	Line 232 | Line 242 | public abstract class ForkJoinTask<V> im
242		}
243
244		/**
245	<	* Blocks a non-worker-thread until completion.
245	>	* Blocks a worker thread until completed or timed out.  Called
246	>	* only by pool.
247	>	*
248		* @return status on exit
249		*/
250	<	private int externalAwaitDone() {
250	>	final int internalAwaitDone(long millis, int nanos) {
251	>	int s;
252	>	if ((s = status) >= 0) {
253	>	try {
254	>	synchronized (this) {
255	>	if (UNSAFE.compareAndSwapInt(this, statusOffset, s,SIGNAL))
256	>	wait(millis, nanos);
257	>	}
258	>	} catch (InterruptedException ie) {
259	>	cancelIfTerminating();
260	>	}
261	>	s = status;
262	>	}
263	>	return s;
264	>	}
265	>
266	>	/**
267	>	* Blocks a non-worker-thread until completion.
268	>	*/
269	>	private void externalAwaitDone() {
270		int s;
271		while ((s = status) >= 0) {
272	<	synchronized(this) {
273	<	if (UNSAFE.compareAndSwapInt(this, statusOffset, s, SIGNAL)){
272	>	synchronized (this) {
273	>	if (UNSAFE.compareAndSwapInt(this, statusOffset, s, SIGNAL)) {
274		boolean interrupted = false;
275	<	while ((s = status) >= 0) {
275	>	while (status >= 0) {
276		try {
277		wait();
278		} catch (InterruptedException ie) {
#	Line 254 | Line 285 | public abstract class ForkJoinTask<V> im
285		}
286		}
287		}
257	–	return s;
288		}
289
290		/**
#	Line 262 | Line 292 | public abstract class ForkJoinTask<V> im
292		* doesn't wait for completion otherwise. Primary execution method
293		* for ForkJoinWorkerThread.
294		*/
295	<	final void tryExec() {
295	>	final void quietlyExec() {
296		try {
297		if (status < 0 || !exec())
298		return;
#	Line 273 | Line 303 | public abstract class ForkJoinTask<V> im
303		setCompletion(NORMAL); // must be outside try block
304		}
305
276	–	/**
277	–	* If not done and this task is next in worker queue, runs it,
278	–	* else waits for it.
279	–	* @return status on exit
280	–	*/
281	–	private int doJoin() {
282	–	int stat;
283	–	Thread t;
284	–	ForkJoinWorkerThread w;
285	–	if ((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) {
286	–	if ((stat = status) < 0)
287	–	return stat;
288	–	if ((w = (ForkJoinWorkerThread) t).unpushTask(this)) {
289	–	boolean completed;
290	–	try {
291	–	completed = exec();
292	–	} catch (Throwable rex) {
293	–	return setExceptionalCompletion(rex);
294	–	}
295	–	if (completed)
296	–	return setCompletion(NORMAL);
297	–	}
298	–	return w.joinTask(this);
299	–	}
300	–	return externalAwaitDone();
301	–	}
302	–
303	–	/**
304	–	* Unless done, calls exec and records status if completed, or
305	–	* waits for completion otherwise.
306	–	* @return status on exit
307	–	*/
308	–	private int doInvoke() {
309	–	int stat;
310	–	if ((stat = status) >= 0) {
311	–	boolean completed;
312	–	try {
313	–	completed = exec();
314	–	} catch (Throwable rex) {
315	–	return setExceptionalCompletion(rex);
316	–	}
317	–	stat = completed ? setCompletion(NORMAL) : doJoin();
318	–	}
319	–	return stat;
320	–	}
321	–
322	–	/**
323	–	* Returns result or throws exception associated with given status.
324	–	* @param s the status
325	–	*/
326	–	private V reportResult(int s) {
327	–	Throwable ex;
328	–	if (s < NORMAL && (ex = getException()) != null)
329	–	UNSAFE.throwException(ex);
330	–	return getRawResult();
331	–	}
332	–
306		// public methods
307
308		/**
#	Line 365 | Line 338 | public abstract class ForkJoinTask<V> im
338		* @return the computed result
339		*/
340		public final V join() {
341	<	return reportResult(doJoin());
341	>	quietlyJoin();
342	>	Throwable ex;
343	>	if (status < NORMAL && (ex = getException()) != null)
344	>	UNSAFE.throwException(ex);
345	>	return getRawResult();
346		}
347
348		/**
349		* Commences performing this task, awaits its completion if
350	<	* necessary, and return its result, or throws an (unchecked)
351	<	* exception if the underlying computation did so.
350	>	* necessary, and returns its result, or throws an (unchecked)
351	>	* {@code RuntimeException} or {@code Error} if the underlying
352	>	* computation did so.
353		*
354		* @return the computed result
355		*/
356		public final V invoke() {
357	<	return reportResult(doInvoke());
357	>	quietlyInvoke();
358	>	Throwable ex;
359	>	if (status < NORMAL && (ex = getException()) != null)
360	>	UNSAFE.throwException(ex);
361	>	return getRawResult();
362		}
363
364		/**
365		* Forks the given tasks, returning when {@code isDone} holds for
366		* each task or an (unchecked) exception is encountered, in which
367	<	* case the exception is rethrown.  If either task encounters an
368	<	* exception, the other one may be, but is not guaranteed to be,
369	<	* cancelled.  If both tasks throw an exception, then this method
370	<	* throws one of them.  The individual status of each task may be
371	<	* checked using {@link #getException()} and related methods.
367	>	* case the exception is rethrown. If more than one task
368	>	* encounters an exception, then this method throws any one of
369	>	* these exceptions. If any task encounters an exception, the
370	>	* other may be cancelled. However, the execution status of
371	>	* individual tasks is not guaranteed upon exceptional return. The
372	>	* status of each task may be obtained using {@link
373	>	* #getException()} and related methods to check if they have been
374	>	* cancelled, completed normally or exceptionally, or left
375	>	* unprocessed.
376		*
377		* <p>This method may be invoked only from within {@code
378		* ForkJoinTask} computations (as may be determined using method
#	Line 407 | Line 393 | public abstract class ForkJoinTask<V> im
393		/**
394		* Forks the given tasks, returning when {@code isDone} holds for
395		* each task or an (unchecked) exception is encountered, in which
396	<	* case the exception is rethrown. If any task encounters an
397	<	* exception, others may be, but are not guaranteed to be,
398	<	* cancelled.  If more than one task encounters an exception, then
399	<	* this method throws any one of these exceptions.  The individual
400	<	* status of each task may be checked using {@link #getException()}
401	<	* and related methods.
396	>	* case the exception is rethrown. If more than one task
397	>	* encounters an exception, then this method throws any one of
398	>	* these exceptions. If any task encounters an exception, others
399	>	* may be cancelled. However, the execution status of individual
400	>	* tasks is not guaranteed upon exceptional return. The status of
401	>	* each task may be obtained using {@link #getException()} and
402	>	* related methods to check if they have been cancelled, completed
403	>	* normally or exceptionally, or left unprocessed.
404		*
405		* <p>This method may be invoked only from within {@code
406		* ForkJoinTask} computations (as may be determined using method
#	Line 434 | Line 422 | public abstract class ForkJoinTask<V> im
422		}
423		else if (i != 0)
424		t.fork();
425	<	else if (t.doInvoke() < NORMAL && ex == null)
426	<	ex = t.getException();
425	>	else {
426	>	t.quietlyInvoke();
427	>	if (ex == null && t.status < NORMAL)
428	>	ex = t.getException();
429	>	}
430		}
431		for (int i = 1; i <= last; ++i) {
432		ForkJoinTask<?> t = tasks[i];
433		if (t != null) {
434		if (ex != null)
435		t.cancel(false);
436	<	else if (t.doJoin() < NORMAL && ex == null)
437	<	ex = t.getException();
436	>	else {
437	>	t.quietlyJoin();
438	>	if (ex == null && t.status < NORMAL)
439	>	ex = t.getException();
440	>	}
441		}
442		}
443		if (ex != null)
#	Line 453 | Line 447 | public abstract class ForkJoinTask<V> im
447		/**
448		* Forks all tasks in the specified collection, returning when
449		* {@code isDone} holds for each task or an (unchecked) exception
450	<	* is encountered.  If any task encounters an exception, others
451	<	* may be, but are not guaranteed to be, cancelled.  If more than
452	<	* one task encounters an exception, then this method throws any
453	<	* one of these exceptions.  The individual status of each task
454	<	* may be checked using {@link #getException()} and related
455	<	* methods.  The behavior of this operation is undefined if the
456	<	* specified collection is modified while the operation is in
457	<	* progress.
450	>	* is encountered, in which case the exception is rethrown. If
451	>	* more than one task encounters an exception, then this method
452	>	* throws any one of these exceptions. If any task encounters an
453	>	* exception, others may be cancelled. However, the execution
454	>	* status of individual tasks is not guaranteed upon exceptional
455	>	* return. The status of each task may be obtained using {@link
456	>	* #getException()} and related methods to check if they have been
457	>	* cancelled, completed normally or exceptionally, or left
458	>	* unprocessed.
459		*
460		* <p>This method may be invoked only from within {@code
461		* ForkJoinTask} computations (as may be determined using method
#	Line 490 | Line 485 | public abstract class ForkJoinTask<V> im
485		}
486		else if (i != 0)
487		t.fork();
488	<	else if (t.doInvoke() < NORMAL && ex == null)
489	<	ex = t.getException();
488	>	else {
489	>	t.quietlyInvoke();
490	>	if (ex == null && t.status < NORMAL)
491	>	ex = t.getException();
492	>	}
493		}
494		for (int i = 1; i <= last; ++i) {
495		ForkJoinTask<?> t = ts.get(i);
496		if (t != null) {
497		if (ex != null)
498		t.cancel(false);
499	<	else if (t.doJoin() < NORMAL && ex == null)
500	<	ex = t.getException();
499	>	else {
500	>	t.quietlyJoin();
501	>	if (ex == null && t.status < NORMAL)
502	>	ex = t.getException();
503	>	}
504		}
505		}
506		if (ex != null)
#	Line 532 | Line 533 | public abstract class ForkJoinTask<V> im
533		* @return {@code true} if this task is now cancelled
534		*/
535		public boolean cancel(boolean mayInterruptIfRunning) {
536	<	return setCompletion(CANCELLED) == CANCELLED;
536	>	setCompletion(CANCELLED);
537	>	return status == CANCELLED;
538		}
539
540		/**
#	Line 549 | Line 551 | public abstract class ForkJoinTask<V> im
551		}
552
553		/**
554	<	* Cancels ignoring exceptions if worker is terminating
554	>	* Cancels if current thread is a terminating worker thread,
555	>	* ignoring any exceptions thrown by cancel.
556		*/
557		final void cancelIfTerminating() {
558		Thread t = Thread.currentThread();
#	Line 626 | Line 629 | public abstract class ForkJoinTask<V> im
629
630		/**
631		* Completes this task, and if not already aborted or cancelled,
632	<	* returning a {@code null} result upon {@code join} and related
633	<	* operations. This method may be used to provide results for
634	<	* asynchronous tasks, or to provide alternative handling for
635	<	* tasks that would not otherwise complete normally. Its use in
636	<	* other situations is discouraged. This method is
637	<	* overridable, but overridden versions must invoke {@code super}
638	<	* implementation to maintain guarantees.
632	>	* returning the given value as the result of subsequent
633	>	* invocations of {@code join} and related operations. This method
634	>	* may be used to provide results for asynchronous tasks, or to
635	>	* provide alternative handling for tasks that would not otherwise
636	>	* complete normally. Its use in other situations is
637	>	* discouraged. This method is overridable, but overridden
638	>	* versions must invoke {@code super} implementation to maintain
639	>	* guarantees.
640		*
641		* @param value the result value for this task
642		*/
#	Line 646 | Line 650 | public abstract class ForkJoinTask<V> im
650		setCompletion(NORMAL);
651		}
652
653	+	/**
654	+	* Waits if necessary for the computation to complete, and then
655	+	* retrieves its result.
656	+	*
657	+	* @return the computed result
658	+	* @throws CancellationException if the computation was cancelled
659	+	* @throws ExecutionException if the computation threw an
660	+	* exception
661	+	* @throws InterruptedException if the current thread is not a
662	+	* member of a ForkJoinPool and was interrupted while waiting
663	+	*/
664		public final V get() throws InterruptedException, ExecutionException {
665	<	int s = doJoin();
666	<	if (Thread.interrupted())
667	<	throw new InterruptedException();
665	>	int s;
666	>	if (Thread.currentThread() instanceof ForkJoinWorkerThread) {
667	>	quietlyJoin();
668	>	s = status;
669	>	}
670	>	else {
671	>	while ((s = status) >= 0) {
672	>	synchronized (this) { // interruptible form of awaitDone
673	>	if (UNSAFE.compareAndSwapInt(this, statusOffset,
674	>	s, SIGNAL)) {
675	>	while (status >= 0)
676	>	wait();
677	>	}
678	>	}
679	>	}
680	>	}
681		if (s < NORMAL) {
682		Throwable ex;
683		if (s == CANCELLED)
#	Line 660 | Line 688 | public abstract class ForkJoinTask<V> im
688		return getRawResult();
689		}
690
691	+	/**
692	+	* Waits if necessary for at most the given time for the computation
693	+	* to complete, and then retrieves its result, if available.
694	+	*
695	+	* @param timeout the maximum time to wait
696	+	* @param unit the time unit of the timeout argument
697	+	* @return the computed result
698	+	* @throws CancellationException if the computation was cancelled
699	+	* @throws ExecutionException if the computation threw an
700	+	* exception
701	+	* @throws InterruptedException if the current thread is not a
702	+	* member of a ForkJoinPool and was interrupted while waiting
703	+	* @throws TimeoutException if the wait timed out
704	+	*/
705		public final V get(long timeout, TimeUnit unit)
706		throws InterruptedException, ExecutionException, TimeoutException {
707	<	Thread t = Thread.currentThread();
708	<	ForkJoinPool pool;
709	<	if (t instanceof ForkJoinWorkerThread) {
710	<	ForkJoinWorkerThread w = (ForkJoinWorkerThread) t;
711	<	if (status >= 0 && w.unpushTask(this))
712	<	tryExec();
713	<	pool = w.pool;
714	<	}
715	<	else
716	<	pool = null;
717	<	/*
718	<	* Timed wait loop intermixes cases for FJ (pool != null) and
719	<	* non FJ threads. For FJ, decrement pool count but don't try
720	<	* for replacement; increment count on completion. For non-FJ,
721	<	* deal with interrupts. This is messy, but a little less so
722	<	* than is splitting the FJ and nonFJ cases.
723	<	*/
682	<	boolean interrupted = false;
683	<	boolean dec = false; // true if pool count decremented
684	<	for (;;) {
685	<	if (Thread.interrupted() && pool == null) {
686	<	interrupted = true;
687	<	break;
707	>	long nanos = unit.toNanos(timeout);
708	>	if (status >= 0) {
709	>	Thread t = Thread.currentThread();
710	>	if (t instanceof ForkJoinWorkerThread) {
711	>	ForkJoinWorkerThread w = (ForkJoinWorkerThread) t;
712	>	boolean completed = false; // timed variant of quietlyJoin
713	>	if (w.unpushTask(this)) {
714	>	try {
715	>	completed = exec();
716	>	} catch (Throwable rex) {
717	>	setExceptionalCompletion(rex);
718	>	}
719	>	}
720	>	if (completed)
721	>	setCompletion(NORMAL);
722	>	else if (status >= 0)
723	>	w.joinTask(this, true, nanos);
724		}
725	<	int s = status;
726	<	if (s < 0)
727	<	break;
692	<	if (UNSAFE.compareAndSwapInt(this, statusOffset, s, SIGNAL)) {
725	>	else if (Thread.interrupted())
726	>	throw new InterruptedException();
727	>	else {
728		long startTime = System.nanoTime();
729	<	long nanos = unit.toNanos(timeout);
730	<	long nt; // wait time
696	<	while (status >= 0 &&
729	>	int s; long nt;
730	>	while ((s = status) >= 0 &&
731		(nt = nanos - (System.nanoTime() - startTime)) > 0) {
732	<	if (pool != null && !dec)
733	<	dec = pool.tryDecrementRunningCount();
700	<	else {
732	>	if (UNSAFE.compareAndSwapInt(this, statusOffset, s,
733	>	SIGNAL)) {
734		long ms = nt / 1000000;
735		int ns = (int) (nt % 1000000);
736	<	try {
737	<	synchronized(this) {
738	<	if (status >= 0)
706	<	wait(ms, ns);
707	<	}
708	<	} catch (InterruptedException ie) {
709	<	if (pool != null)
710	<	cancelIfTerminating();
711	<	else {
712	<	interrupted = true;
713	<	break;
714	<	}
736	>	synchronized (this) {
737	>	if (status >= 0)
738	>	wait(ms, ns); // exit on IE throw
739		}
740		}
741		}
718	–	break;
742		}
743		}
721	–	if (pool != null && dec)
722	–	pool.incrementRunningCount();
723	–	if (interrupted)
724	–	throw new InterruptedException();
744		int es = status;
745		if (es != NORMAL) {
746		Throwable ex;
#	Line 735 | Line 754 | public abstract class ForkJoinTask<V> im
754		}
755
756		/**
757	<	* Joins this task, without returning its result or throwing an
757	>	* Joins this task, without returning its result or throwing its
758		* exception. This method may be useful when processing
759		* collections of tasks when some have been cancelled or otherwise
760		* known to have aborted.
761		*/
762		public final void quietlyJoin() {
763	<	doJoin();
763	>	Thread t;
764	>	if ((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) {
765	>	ForkJoinWorkerThread w = (ForkJoinWorkerThread) t;
766	>	if (status >= 0) {
767	>	if (w.unpushTask(this)) {
768	>	boolean completed;
769	>	try {
770	>	completed = exec();
771	>	} catch (Throwable rex) {
772	>	setExceptionalCompletion(rex);
773	>	return;
774	>	}
775	>	if (completed) {
776	>	setCompletion(NORMAL);
777	>	return;
778	>	}
779	>	}
780	>	w.joinTask(this, false, 0L);
781	>	}
782	>	}
783	>	else
784	>	externalAwaitDone();
785		}
786
787		/**
788		* Commences performing this task and awaits its completion if
789	<	* necessary, without returning its result or throwing an
790	<	* exception. This method may be useful when processing
751	<	* collections of tasks when some have been cancelled or otherwise
752	<	* known to have aborted.
789	>	* necessary, without returning its result or throwing its
790	>	* exception.
791		*/
792		public final void quietlyInvoke() {
793	<	doInvoke();
793	>	if (status >= 0) {
794	>	boolean completed;
795	>	try {
796	>	completed = exec();
797	>	} catch (Throwable rex) {
798	>	setExceptionalCompletion(rex);
799	>	return;
800	>	}
801	>	if (completed)
802	>	setCompletion(NORMAL);
803	>	else
804	>	quietlyJoin();
805	>	}
806		}
807
808		/**
#	Line 1074 | Line 1124 | public abstract class ForkJoinTask<V> im
1124		private static final long serialVersionUID = -7721805057305804111L;
1125
1126		/**
1127	<	* Saves the state to a stream.
1127	>	* Saves the state to a stream (that is, serializes it).
1128		*
1129		* @serialData the current run status and the exception thrown
1130		* during execution, or {@code null} if none
#	Line 1087 | Line 1137 | public abstract class ForkJoinTask<V> im
1137		}
1138
1139		/**
1140	<	* Reconstitutes the instance from a stream.
1140	>	* Reconstitutes the instance from a stream (that is, deserializes it).
1141		*
1142		* @param s the stream
1143		*/

Diff Legend

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