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

Comparing jsr166/src/jsr166y/ForkJoinTask.java (file contents):
Revision 1.13 by dl, Wed Jul 22 19:04:11 2009 UTC vs.
Revision 1.15 by jsr166, Fri Jul 24 22:05:22 2009 UTC

#	Line 83 | Line 83 | import java.lang.reflect.*;
83		* methods), some of them may only be called from within other
84		* ForkJoinTasks (as may be determined using method {@link
85		* #inForkJoinPool}).  Attempts to invoke them in other contexts
86	<	* result in exceptions or errors possibly including
86	>	* result in exceptions or errors, possibly including
87		* ClassCastException.
88		*
89		* <p>Most base support methods are {@code final} because their
#	Line 162 | Line 162 | public abstract class ForkJoinTask<V> im
162		*/
163		static ForkJoinWorkerThread getWorker() {
164		Thread t = Thread.currentThread();
165	<	return ((t instanceof ForkJoinWorkerThread)?
166	<	(ForkJoinWorkerThread)t : null);
165	>	return ((t instanceof ForkJoinWorkerThread) ?
166	>	(ForkJoinWorkerThread) t : null);
167		}
168
169		final boolean casStatus(int cmp, int val) {
#	Line 189 | Line 189 | public abstract class ForkJoinTask<V> im
189		ForkJoinPool pool = getPool();
190		if (pool != null) {
191		int s; // Clear signal bits while setting completion status
192	<	do;while ((s = status) >= 0 && !casStatus(s, completion));
192	>	do {} while ((s = status) >= 0 && !casStatus(s, completion));
193
194		if ((s & SIGNAL_MASK) != 0) {
195		if ((s &= INTERNAL_SIGNAL_MASK) != 0)
196		pool.updateRunningCount(s);
197	<	synchronized(this) { notifyAll(); }
197	>	synchronized (this) { notifyAll(); }
198		}
199		}
200		else
#	Line 207 | Line 207 | public abstract class ForkJoinTask<V> im
207		*/
208		private void externallySetCompletion(int completion) {
209		int s;
210	<	do;while ((s = status) >= 0 &&
211	<	!casStatus(s, (s & SIGNAL_MASK) | completion));
212	<	synchronized(this) { notifyAll(); }
210	>	do {} while ((s = status) >= 0 &&
211	>	!casStatus(s, (s & SIGNAL_MASK) | completion));
212	>	synchronized (this) { notifyAll(); }
213		}
214
215		/**
216	<	* Sets status to indicate normal completion
216	>	* Sets status to indicate normal completion.
217		*/
218		final void setNormalCompletion() {
219		// Try typical fast case -- single CAS, no signal, not already done.
#	Line 225 | Line 225 | public abstract class ForkJoinTask<V> im
225		// internal waiting and notification
226
227		/**
228	<	* Performs the actual monitor wait for awaitDone
228	>	* Performs the actual monitor wait for awaitDone.
229		*/
230		private void doAwaitDone() {
231		// Minimize lock bias and in/de-flation effects by maximizing
232		// chances of waiting inside sync
233		try {
234		while (status >= 0)
235	<	synchronized(this) { if (status >= 0) wait(); }
235	>	synchronized (this) { if (status >= 0) wait(); }
236		} catch (InterruptedException ie) {
237		onInterruptedWait();
238		}
239		}
240
241		/**
242	<	* Performs the actual monitor wait for awaitDone
242	>	* Performs the actual timed monitor wait for awaitDone.
243		*/
244		private void doAwaitDone(long startTime, long nanos) {
245	<	synchronized(this) {
245	>	synchronized (this) {
246		try {
247		while (status >= 0) {
248		long nt = nanos - System.nanoTime() - startTime;
249		if (nt <= 0)
250		break;
251	<	wait(nt / 1000000, (int)(nt % 1000000));
251	>	wait(nt / 1000000, (int) (nt % 1000000));
252		}
253		} catch (InterruptedException ie) {
254		onInterruptedWait();
#	Line 264 | Line 264 | public abstract class ForkJoinTask<V> im
264		*
265		* @return status upon exit
266		*/
267	<	private int awaitDone(ForkJoinWorkerThread w, boolean maintainParallelism) {
268	<	ForkJoinPool pool = w == null? null : w.pool;
267	>	private int awaitDone(ForkJoinWorkerThread w,
268	>	boolean maintainParallelism) {
269	>	ForkJoinPool pool = (w == null) ? null : w.pool;
270		int s;
271		while ((s = status) >= 0) {
272	<	if (casStatus(s, pool == null? s|EXTERNAL_SIGNAL : s+1)) {
272	>	if (casStatus(s, (pool == null) ? s|EXTERNAL_SIGNAL : s+1)) {
273		if (pool == null || !pool.preJoin(this, maintainParallelism))
274		doAwaitDone();
275		if (((s = status) & INTERNAL_SIGNAL_MASK) != 0)
#	Line 281 | Line 282 | public abstract class ForkJoinTask<V> im
282
283		/**
284		* Timed version of awaitDone
285	+	*
286		* @return status upon exit
287		*/
288		private int awaitDone(ForkJoinWorkerThread w, long nanos) {
289	<	ForkJoinPool pool = w == null? null : w.pool;
289	>	ForkJoinPool pool = (w == null) ? null : w.pool;
290		int s;
291		while ((s = status) >= 0) {
292	<	if (casStatus(s, pool == null? s|EXTERNAL_SIGNAL : s+1)) {
292	>	if (casStatus(s, (pool == null) ? s|EXTERNAL_SIGNAL : s+1)) {
293		long startTime = System.nanoTime();
294		if (pool == null || !pool.preJoin(this, false))
295		doAwaitDone(startTime, nanos);
#	Line 309 | Line 311 | public abstract class ForkJoinTask<V> im
311		*/
312		private void adjustPoolCountsOnUnblock(ForkJoinPool pool) {
313		int s;
314	<	do;while ((s = status) < 0 && !casStatus(s, s & COMPLETION_MASK));
314	>	do {} while ((s = status) < 0 && !casStatus(s, s & COMPLETION_MASK));
315		if (pool != null && (s &= INTERNAL_SIGNAL_MASK) != 0)
316		pool.updateRunningCount(s);
317		}
#	Line 364 | Line 366 | public abstract class ForkJoinTask<V> im
366
367		/**
368		* Returns result or throws exception using j.u.c.Future conventions.
369	<	* Only call when isDone known to be true.
369	>	* Only call when {@code isDone} known to be true.
370		*/
371		private V reportFutureResult()
372		throws ExecutionException, InterruptedException {
#	Line 430 | Line 432 | public abstract class ForkJoinTask<V> im
432		try {
433		if (!exec())
434		return;
435	<	} catch(Throwable rex) {
435	>	} catch (Throwable rex) {
436		setDoneExceptionally(rex);
437		return;
438		}
#	Line 462 | Line 464 | public abstract class ForkJoinTask<V> im
464		final void cancelIgnoringExceptions() {
465		try {
466		cancel(false);
467	<	} catch(Throwable ignore) {
467	>	} catch (Throwable ignore) {
468		}
469		}
470
#	Line 474 | Line 476 | public abstract class ForkJoinTask<V> im
476		ForkJoinTask<?> t;
477		while ((s = status) >= 0 && (t = w.scanWhileJoining(this)) != null)
478		t.quietlyExec();
479	<	return (s >= 0)? awaitDone(w, false) : s; // block if no work
479	>	return (s >= 0) ? awaitDone(w, false) : s; // block if no work
480		}
481
482		// public methods
#	Line 486 | Line 488 | public abstract class ForkJoinTask<V> im
488		* method may be invoked only from within ForkJoinTask
489		* computations (as may be determined using method {@link
490		* #inForkJoinPool}). Attempts to invoke in other contexts result
491	<	* in exceptions or errors possibly including ClassCastException.
491	>	* in exceptions or errors, possibly including ClassCastException.
492		*/
493		public final void fork() {
494	<	((ForkJoinWorkerThread)(Thread.currentThread())).pushTask(this);
494	>	((ForkJoinWorkerThread) Thread.currentThread())
495	>	.pushTask(this);
496		}
497
498		/**
#	Line 527 | Line 530 | public abstract class ForkJoinTask<V> im
530		* both of them or an exception is encountered. This method may be
531		* invoked only from within ForkJoinTask computations (as may be
532		* determined using method {@link #inForkJoinPool}). Attempts to
533	<	* invoke in other contexts result in exceptions or errors
533	>	* invoke in other contexts result in exceptions or errors,
534		* possibly including ClassCastException.
535		*
536		* @param t1 one task
#	Line 547 | Line 550 | public abstract class ForkJoinTask<V> im
550		* may be cancelled.  This method may be invoked only from within
551		* ForkJoinTask computations (as may be determined using method
552		* {@link #inForkJoinPool}). Attempts to invoke in other contexts
553	<	* result in exceptions or errors possibly including
553	>	* result in exceptions or errors, possibly including
554		* ClassCastException.
555	+	*
556		* @param tasks the array of tasks
557		* @throws NullPointerException if tasks or any element are null
558		* @throws RuntimeException or Error if any task did so
#	Line 592 | Line 596 | public abstract class ForkJoinTask<V> im
596		* encounters an exception, others may be cancelled.  This method
597		* may be invoked only from within ForkJoinTask computations (as
598		* may be determined using method {@link
599	<	* #inForkJoinPool}). Attempts to invoke in other contexts resul!t
600	<	* in exceptions or errors possibly including ClassCastException.
599	>	* #inForkJoinPool}). Attempts to invoke in other contexts result
600	>	* in exceptions or errors, possibly including ClassCastException.
601		*
602		* @param tasks the collection of tasks
603		* @throws NullPointerException if tasks or any element are null
604		* @throws RuntimeException or Error if any task did so
605		*/
606		public static void invokeAll(Collection<? extends ForkJoinTask<?>> tasks) {
607	<	if (!(tasks instanceof List)) {
608	<	invokeAll(tasks.toArray(new ForkJoinTask[tasks.size()]));
607	>	if (!(tasks instanceof List<?>)) {
608	>	invokeAll(tasks.toArray(new ForkJoinTask<?>[tasks.size()]));
609		return;
610		}
611	+	@SuppressWarnings("unchecked")
612		List<? extends ForkJoinTask<?>> ts =
613	<	(List<? extends ForkJoinTask<?>>)tasks;
613	>	(List<? extends ForkJoinTask<?>>) tasks;
614		Throwable ex = null;
615		int last = ts.size() - 1;
616		for (int i = last; i >= 0; --i) {
#	Line 680 | Line 685 | public abstract class ForkJoinTask<V> im
685		*
686		* @param mayInterruptIfRunning this value is ignored in the
687		* default implementation because tasks are not in general
688	<	* cancelled via interruption.
688	>	* cancelled via interruption
689		*
690		* @return true if this task is now cancelled
691		*/
#	Line 730 | Line 735 | public abstract class ForkJoinTask<V> im
735		*/
736		public void completeExceptionally(Throwable ex) {
737		setDoneExceptionally((ex instanceof RuntimeException) ||
738	<	(ex instanceof Error)? ex :
738	>	(ex instanceof Error) ? ex :
739		new RuntimeException(ex));
740		}
741
#	Line 749 | Line 754 | public abstract class ForkJoinTask<V> im
754		public void complete(V value) {
755		try {
756		setRawResult(value);
757	<	} catch(Throwable rex) {
757	>	} catch (Throwable rex) {
758		setDoneExceptionally(rex);
759		return;
760		}
#	Line 781 | Line 786 | public abstract class ForkJoinTask<V> im
786		* tasks). This method may be invoked only from within
787		* ForkJoinTask computations (as may be determined using method
788		* {@link #inForkJoinPool}). Attempts to invoke in other contexts
789	<	* resul!t in exceptions or errors possibly including
789	>	* result in exceptions or errors, possibly including
790		* ClassCastException.
791		*
792		* @return the computed result
793		*/
794		public final V helpJoin() {
795	<	ForkJoinWorkerThread w = (ForkJoinWorkerThread)(Thread.currentThread());
795	>	ForkJoinWorkerThread w = (ForkJoinWorkerThread) Thread.currentThread();
796		if (status < 0 || !w.unpushTask(this) || !tryExec())
797		reportException(busyJoin(w));
798		return getRawResult();
#	Line 797 | Line 802 | public abstract class ForkJoinTask<V> im
802		* Possibly executes other tasks until this task is ready.  This
803		* method may be invoked only from within ForkJoinTask
804		* computations (as may be determined using method {@link
805	<	* #inForkJoinPool}). Attempts to invoke in other contexts resul!t
806	<	* in exceptions or errors possibly including ClassCastException.
805	>	* #inForkJoinPool}). Attempts to invoke in other contexts result
806	>	* in exceptions or errors, possibly including ClassCastException.
807		*/
808		public final void quietlyHelpJoin() {
809		if (status >= 0) {
810		ForkJoinWorkerThread w =
811	<	(ForkJoinWorkerThread)(Thread.currentThread());
811	>	(ForkJoinWorkerThread) Thread.currentThread();
812		if (!w.unpushTask(this) || !tryQuietlyInvoke())
813		busyJoin(w);
814		}
#	Line 842 | Line 847 | public abstract class ForkJoinTask<V> im
847		* joined, instead executing them until all are processed.
848		*/
849		public static void helpQuiesce() {
850	<	((ForkJoinWorkerThread)(Thread.currentThread())).
851	<	helpQuiescePool();
850	>	((ForkJoinWorkerThread) Thread.currentThread())
851	>	.helpQuiescePool();
852		}
853
854		/**
#	Line 866 | Line 871 | public abstract class ForkJoinTask<V> im
871		* Returns the pool hosting the current task execution, or null
872		* if this task is executing outside of any ForkJoinPool.
873		*
874	<	* @return the pool, or null if none.
874	>	* @return the pool, or null if none
875		*/
876		public static ForkJoinPool getPool() {
877		Thread t = Thread.currentThread();
878	<	return ((t instanceof ForkJoinWorkerThread)?
879	<	((ForkJoinWorkerThread)t).pool : null);
878	>	return (t instanceof ForkJoinWorkerThread) ?
879	>	((ForkJoinWorkerThread) t).pool : null;
880		}
881
882		/**
883	<	* Returns true if the current thread is executing as a
883	>	* Returns {@code true} if the current thread is executing as a
884		* ForkJoinPool computation.
885	<	* @return <code>true</code> if the current thread is executing as a
885	>	*
886	>	* @return {@code true} if the current thread is executing as a
887		* ForkJoinPool computation, or false otherwise
888		*/
889		public static boolean inForkJoinPool() {
#	Line 893 | Line 899 | public abstract class ForkJoinTask<V> im
899		* were not, stolen. This method may be invoked only from within
900		* ForkJoinTask computations (as may be determined using method
901		* {@link #inForkJoinPool}). Attempts to invoke in other contexts
902	<	* result in exceptions or errors possibly including
902	>	* result in exceptions or errors, possibly including
903		* ClassCastException.
904		*
905		* @return true if unforked
906		*/
907		public boolean tryUnfork() {
908	<	return ((ForkJoinWorkerThread)(Thread.currentThread())).unpushTask(this);
908	>	return ((ForkJoinWorkerThread) Thread.currentThread())
909	>	.unpushTask(this);
910		}
911
912		/**
#	Line 911 | Line 918 | public abstract class ForkJoinTask<V> im
918		* @return the number of tasks
919		*/
920		public static int getQueuedTaskCount() {
921	<	return ((ForkJoinWorkerThread)(Thread.currentThread())).
922	<	getQueueSize();
921	>	return ((ForkJoinWorkerThread) Thread.currentThread())
922	>	.getQueueSize();
923		}
924
925		/**
#	Line 928 | Line 935 | public abstract class ForkJoinTask<V> im
935		* @return the surplus number of tasks, which may be negative
936		*/
937		public static int getSurplusQueuedTaskCount() {
938	<	return ((ForkJoinWorkerThread)(Thread.currentThread()))
938	>	return ((ForkJoinWorkerThread) Thread.currentThread())
939		.getEstimatedSurplusTaskCount();
940		}
941
#	Line 977 | Line 984 | public abstract class ForkJoinTask<V> im
984		* This method may be invoked only from within ForkJoinTask
985		* computations (as may be determined using method {@link
986		* #inForkJoinPool}). Attempts to invoke in other contexts result
987	<	* in exceptions or errors possibly including ClassCastException.
987	>	* in exceptions or errors, possibly including ClassCastException.
988		*
989		* @return the next task, or null if none are available
990		*/
991		protected static ForkJoinTask<?> peekNextLocalTask() {
992	<	return ((ForkJoinWorkerThread)(Thread.currentThread())).peekTask();
992	>	return ((ForkJoinWorkerThread) Thread.currentThread())
993	>	.peekTask();
994		}
995
996		/**
#	Line 992 | Line 1000 | public abstract class ForkJoinTask<V> im
1000		* be useful otherwise.  This method may be invoked only from
1001		* within ForkJoinTask computations (as may be determined using
1002		* method {@link #inForkJoinPool}). Attempts to invoke in other
1003	<	* contexts result in exceptions or errors possibly including
1003	>	* contexts result in exceptions or errors, possibly including
1004		* ClassCastException.
1005		*
1006		* @return the next task, or null if none are available
1007		*/
1008		protected static ForkJoinTask<?> pollNextLocalTask() {
1009	<	return ((ForkJoinWorkerThread)(Thread.currentThread())).pollLocalTask();
1009	>	return ((ForkJoinWorkerThread) Thread.currentThread())
1010	>	.pollLocalTask();
1011		}
1012
1013		/**
#	Line 1012 | Line 1021 | public abstract class ForkJoinTask<V> im
1021		* otherwise.  This method may be invoked only from within
1022		* ForkJoinTask computations (as may be determined using method
1023		* {@link #inForkJoinPool}). Attempts to invoke in other contexts
1024	<	* result in exceptions or errors possibly including
1024	>	* result in exceptions or errors, possibly including
1025		* ClassCastException.
1026		*
1027		* @return a task, or null if none are available
1028		*/
1029		protected static ForkJoinTask<?> pollTask() {
1030	<	return ((ForkJoinWorkerThread)(Thread.currentThread())).
1031	<	pollTask();
1030	>	return ((ForkJoinWorkerThread) Thread.currentThread())
1031	>	.pollTask();
1032		}
1033
1034		// Serialization support
#	Line 1051 | Line 1060 | public abstract class ForkJoinTask<V> im
1060		status |= EXTERNAL_SIGNAL; // conservatively set external signal
1061		Object ex = s.readObject();
1062		if (ex != null)
1063	<	setDoneExceptionally((Throwable)ex);
1063	>	setDoneExceptionally((Throwable) ex);
1064		}
1065
1066		// Temporary Unsafe mechanics for preliminary release

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