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

Comparing jsr166/src/jsr166y/ForkJoinTask.java (file contents):
Revision 1.84 by jsr166, Sat Jan 28 04:32:25 2012 UTC vs.
Revision 1.91 by dl, Sun Oct 28 22:36:01 2012 UTC

#	Line 5 | Line 5
5		*/
6
7		package jsr166y;
8	+
9		import java.io.Serializable;
10		import java.util.Collection;
11		import java.util.List;
#	Line 29 | Line 30 | import java.lang.reflect.Constructor;
30		* subtasks may be hosted by a small number of actual threads in a
31		* ForkJoinPool, at the price of some usage limitations.
32		*
33	<	* <p>A "main" {@code ForkJoinTask} begins execution when submitted
34	<	* to a {@link ForkJoinPool}.  Once started, it will usually in turn
35	<	* start other subtasks.  As indicated by the name of this class,
36	<	* many programs using {@code ForkJoinTask} employ only methods
37	<	* {@link #fork} and {@link #join}, or derivatives such as {@link
33	>	* <p>A "main" {@code ForkJoinTask} begins execution when it is
34	>	* explicitly submitted to a {@link ForkJoinPool}, or, if not already
35	>	* engaged in a ForkJoin computation, commenced in the {@link
36	>	* ForkJoinPool#commonPool} via {@link #fork}, {@link #invoke}, or
37	>	* related methods.  Once started, it will usually in turn start other
38	>	* subtasks.  As indicated by the name of this class, many programs
39	>	* using {@code ForkJoinTask} employ only methods {@link #fork} and
40	>	* {@link #join}, or derivatives such as {@link
41		* #invokeAll(ForkJoinTask...) invokeAll}.  However, this class also
42		* provides a number of other methods that can come into play in
43	<	* advanced usages, as well as extension mechanics that allow
44	<	* support of new forms of fork/join processing.
43	>	* advanced usages, as well as extension mechanics that allow support
44	>	* of new forms of fork/join processing.
45		*
46		* <p>A {@code ForkJoinTask} is a lightweight form of {@link Future}.
47		* The efficiency of {@code ForkJoinTask}s stems from a set of
#	Line 70 | Line 74 | import java.lang.reflect.Constructor;
74		* but doing do requires three further considerations: (1) Completion
75		* of few if any <em>other</em> tasks should be dependent on a task
76		* that blocks on external synchronization or IO. Event-style async
77	<	* tasks that are never joined often fall into this category.  (2) To
78	<	* minimize resource impact, tasks should be small; ideally performing
79	<	* only the (possibly) blocking action. (3) Unless the {@link
77	>	* tasks that are never joined (for example, those subclassing {@link
78	>	* CountedCompleter}) often fall into this category.  (2) To minimize
79	>	* resource impact, tasks should be small; ideally performing only the
80	>	* (possibly) blocking action. (3) Unless the {@link
81		* ForkJoinPool.ManagedBlocker} API is used, or the number of possibly
82		* blocked tasks is known to be less than the pool's {@link
83		* ForkJoinPool#getParallelism} level, the pool cannot guarantee that
#	Line 115 | Line 120 | import java.lang.reflect.Constructor;
120		* <p>The ForkJoinTask class is not usually directly subclassed.
121		* Instead, you subclass one of the abstract classes that support a
122		* particular style of fork/join processing, typically {@link
123	<	* RecursiveAction} for computations that do not return results, or
124	<	* {@link RecursiveTask} for those that do.  Normally, a concrete
125	<	* ForkJoinTask subclass declares fields comprising its parameters,
126	<	* established in a constructor, and then defines a {@code compute}
127	<	* method that somehow uses the control methods supplied by this base
128	<	* class. While these methods have {@code public} access (to allow
129	<	* instances of different task subclasses to call each other's
125	<	* methods), some of them may only be called from within other
126	<	* ForkJoinTasks (as may be determined using method {@link
127	<	* #inForkJoinPool}).  Attempts to invoke them in other contexts
128	<	* result in exceptions or errors, possibly including
129	<	* {@code ClassCastException}.
123	>	* RecursiveAction} for most computations that do not return results,
124	>	* {@link RecursiveTask} for those that do, and {@link
125	>	* CountedCompleter} for those in which completed actions trigger
126	>	* other actions.  Normally, a concrete ForkJoinTask subclass declares
127	>	* fields comprising its parameters, established in a constructor, and
128	>	* then defines a {@code compute} method that somehow uses the control
129	>	* methods supplied by this base class.
130		*
131		* <p>Method {@link #join} and its variants are appropriate for use
132		* only when completion dependencies are acyclic; that is, the
#	Line 137 | Line 137 | import java.lang.reflect.Constructor;
137		* {@link Phaser}, {@link #helpQuiesce}, and {@link #complete}) that
138		* may be of use in constructing custom subclasses for problems that
139		* are not statically structured as DAGs. To support such usages a
140	<	* ForkJoinTask may be atomically <em>marked</em> using {@link
141	<	* #markForkJoinTask} and checked for marking using {@link
142	<	* #isMarkedForkJoinTask}. The ForkJoinTask implementation does not
143	<	* use these {@code protected} methods or marks for any purpose, but
144	<	* they may be of use in the construction of specialized subclasses.
145	<	* For example, parallel graph traversals can use the supplied methods
146	<	* to avoid revisiting nodes/tasks that have already been processed.
147	<	* Also, completion based designs can use them to record that one
148	<	* subtask has completed. (Method names for marking are bulky in part
149	<	* to encourage definition of methods that reflect their usage
150	<	* patterns.)
140	>	* ForkJoinTask may be atomically <em>tagged</em> with a {@code short}
141	>	* value using {@link #setForkJoinTaskTag} or {@link
142	>	* #compareAndSetForkJoinTaskTag} and checked using {@link
143	>	* #getForkJoinTaskTag}. The ForkJoinTask implementation does not use
144	>	* these {@code protected} methods or tags for any purpose, but they
145	>	* may be of use in the construction of specialized subclasses.  For
146	>	* example, parallel graph traversals can use the supplied methods to
147	>	* avoid revisiting nodes/tasks that have already been processed.
148	>	* (Method names for tagging are bulky in part to encourage definition
149	>	* of methods that reflect their usage patterns.)
150		*
151		* <p>Most base support methods are {@code final}, to prevent
152		* overriding of implementations that are intrinsically tied to the
#	Line 197 | Line 196 | public abstract class ForkJoinTask<V> im
196		* methods in a way that flows well in javadocs.
197		*/
198
200	–	/**
201	–	* The number of times to try to help join a task without any
202	–	* apparent progress before giving up and blocking. The value is
203	–	* arbitrary but should be large enough to cope with transient
204	–	* stalls (due to GC etc) that can cause helping methods not to be
205	–	* able to proceed because other workers have not progressed to
206	–	* the point where subtasks can be found or taken.
207	–	*/
208	–	private static final int HELP_RETRIES = 32;
209	–
199		/*
200		* The status field holds run control status bits packed into a
201		* single int to minimize footprint and to ensure atomicity (via
202		* CAS).  Status is initially zero, and takes on nonnegative
203	<	* values until completed, upon which status holds value
204	<	* NORMAL, CANCELLED, or EXCEPTIONAL. Tasks undergoing blocking
205	<	* waits by other threads have the SIGNAL bit set.  Completion of
206	<	* a stolen task with SIGNAL set awakens any waiters via
207	<	* notifyAll. Even though suboptimal for some purposes, we use
208	<	* basic builtin wait/notify to take advantage of "monitor
209	<	* inflation" in JVMs that we would otherwise need to emulate to
210	<	* avoid adding further per-task bookkeeping overhead.  We want
211	<	* these monitors to be "fat", i.e., not use biasing or thin-lock
212	<	* techniques, so use some odd coding idioms that tend to avoid
213	<	* them.
203	>	* values until completed, upon which status (anded with
204	>	* DONE_MASK) holds value NORMAL, CANCELLED, or EXCEPTIONAL. Tasks
205	>	* undergoing blocking waits by other threads have the SIGNAL bit
206	>	* set.  Completion of a stolen task with SIGNAL set awakens any
207	>	* waiters via notifyAll. Even though suboptimal for some
208	>	* purposes, we use basic builtin wait/notify to take advantage of
209	>	* "monitor inflation" in JVMs that we would otherwise need to
210	>	* emulate to avoid adding further per-task bookkeeping overhead.
211	>	* We want these monitors to be "fat", i.e., not use biasing or
212	>	* thin-lock techniques, so use some odd coding idioms that tend
213	>	* to avoid them, mainly by arranging that every synchronized
214	>	* block performs a wait, notifyAll or both.
215	>	*
216	>	* These control bits occupy only (some of) the upper half (16
217	>	* bits) of status field. The lower bits are used for user-defined
218	>	* tags.
219		*/
220
221		/** The run status of this task */
222		volatile int status; // accessed directly by pool and workers
223	<	static final int NORMAL      = 0xfffffffc;  // negative with low 2 bits 0
224	<	static final int CANCELLED   = 0xfffffff8;  // must be < NORMAL
225	<	static final int EXCEPTIONAL = 0xfffffff4;  // must be < CANCELLED
226	<	static final int SIGNAL      = 0x00000001;
227	<	static final int MARKED      = 0x00000002;
223	>	static final int DONE_MASK   = 0xf0000000;  // mask out non-completion bits
224	>	static final int NORMAL      = 0xf0000000;  // must be negative
225	>	static final int CANCELLED   = 0xc0000000;  // must be < NORMAL
226	>	static final int EXCEPTIONAL = 0x80000000;  // must be < CANCELLED
227	>	static final int SIGNAL      = 0x00010000;  // must be >= 1 << 16
228	>	static final int SMASK       = 0x0000ffff;  // short bits for tags
229
230		/**
231		* Marks completion and wakes up threads waiting to join this
232	<	* task, also clearing signal request bits. A specialization for
238	<	* NORMAL completion is in method doExec.
232	>	* task.
233		*
234		* @param completion one of NORMAL, CANCELLED, EXCEPTIONAL
235		* @return completion status on exit
#	Line 244 | Line 238 | public abstract class ForkJoinTask<V> im
238		for (int s;;) {
239		if ((s = status) < 0)
240		return s;
241	<	if (U.compareAndSwapInt(this, STATUS, s, (s & ~SIGNAL)|completion)) {
242	<	if ((s & SIGNAL) != 0)
241	>	if (U.compareAndSwapInt(this, STATUS, s, s | completion)) {
242	>	if ((s >>> 16) != 0)
243		synchronized (this) { notifyAll(); }
244		return completion;
245		}
#	Line 267 | Line 261 | public abstract class ForkJoinTask<V> im
261		} catch (Throwable rex) {
262		return setExceptionalCompletion(rex);
263		}
264	<	while ((s = status) >= 0 && completed) {
265	<	if (U.compareAndSwapInt(this, STATUS, s, (s & ~SIGNAL)|NORMAL)) {
272	<	if ((s & SIGNAL) != 0)
273	<	synchronized (this) { notifyAll(); }
274	<	return NORMAL;
275	<	}
276	<	}
264	>	if (completed)
265	>	s = setCompletion(NORMAL);
266		}
267		return s;
268		}
269
270		/**
271	+	* Tries to set SIGNAL status unless already completed. Used by
272	+	* ForkJoinPool. Other variants are directly incorporated into
273	+	* externalAwaitDone etc.
274	+	*
275	+	* @return true if successful
276	+	*/
277	+	final boolean trySetSignal() {
278	+	int s = status;
279	+	return s >= 0 && U.compareAndSwapInt(this, STATUS, s, s | SIGNAL);
280	+	}
281	+
282	+	/**
283		* Blocks a non-worker-thread until completion.
284		* @return status upon completion
285		*/
286		private int externalAwaitDone() {
287		int s;
288	<	if ((s = status) >= 0) {
289	<	boolean interrupted = false;
290	<	synchronized (this) {
291	<	while ((s = status) >= 0) {
292	<	if (U.compareAndSwapInt(this, STATUS, s, s | SIGNAL)) {
288	>	boolean interrupted = false;
289	>	if ((s = status) >= 0 && ForkJoinPool.tryUnsubmitFromCommonPool(this))
290	>	s = doExec();
291	>	while (s >= 0) {
292	>	if (U.compareAndSwapInt(this, STATUS, s, s | SIGNAL)) {
293	>	synchronized (this) {
294	>	if (status >= 0) {
295		try {
296		wait();
297		} catch (InterruptedException ie) {
298		interrupted = true;
299		}
300		}
301	+	else
302	+	notifyAll();
303		}
304		}
305	<	if (interrupted)
301	<	Thread.currentThread().interrupt();
305	>	s = status;
306		}
307	+	if (interrupted)
308	+	Thread.currentThread().interrupt();
309		return s;
310		}
311
312		/**
313	<	* Blocks a non-worker-thread until completion or interruption or timeout.
313	>	* Blocks a non-worker-thread until completion or interruption.
314		*/
315	<	private int externalInterruptibleAwaitDone(long millis)
310	<	throws InterruptedException {
311	<	int s;
315	>	private int externalInterruptibleAwaitDone() throws InterruptedException {
316		if (Thread.interrupted())
317		throw new InterruptedException();
318	<	if ((s = status) >= 0) {
319	<	synchronized (this) {
320	<	while ((s = status) >= 0) {
321	<	if (U.compareAndSwapInt(this, STATUS, s, s | SIGNAL)) {
322	<	wait(millis);
323	<	if (millis > 0L)
324	<	break;
325	<	}
318	>	int s;
319	>	if ((s = status) >= 0 && ForkJoinPool.tryUnsubmitFromCommonPool(this))
320	>	s = doExec();
321	>	while (s >= 0) {
322	>	if (U.compareAndSwapInt(this, STATUS, s, s | SIGNAL)) {
323	>	synchronized (this) {
324	>	if (status >= 0)
325	>	wait();
326	>	else
327	>	notifyAll();
328		}
329		}
330	+	s = status;
331		}
332		return s;
333		}
334
328	–
335		/**
336		* Implementation for join, get, quietlyJoin. Directly handles
337		* only cases of already-completed, external wait, and
338	<	* unfork+exec.  Others are relayed to awaitJoin.
338	>	* unfork+exec.  Others are relayed to ForkJoinPool.awaitJoin.
339		*
340		* @return status upon completion
341		*/
342		private int doJoin() {
343		int s; Thread t; ForkJoinWorkerThread wt; ForkJoinPool.WorkQueue w;
344	<	if ((s = status) >= 0) {
345	<	if (!((t = Thread.currentThread()) instanceof ForkJoinWorkerThread))
346	<	s = externalAwaitDone();
347	<	else if (!(w = (wt = (ForkJoinWorkerThread)t).workQueue).
348	<	tryUnpush(this) || (s = doExec()) >= 0)
349	<	s = awaitJoin(w, wt.pool);
344	<	}
345	<	return s;
346	<	}
347	<
348	<	/**
349	<	* Helps and/or blocks until joined.
350	<	*
351	<	* @param w the joiner
352	<	* @param p the pool
353	<	* @return status upon completion
354	<	*/
355	<	private int awaitJoin(ForkJoinPool.WorkQueue w, ForkJoinPool p) {
356	<	int s;
357	<	ForkJoinTask<?> prevJoin = w.currentJoin;
358	<	w.currentJoin = this;
359	<	for (int k = HELP_RETRIES; (s = status) >= 0;) {
360	<	if ((w.queueSize() > 0) ?
361	<	w.tryRemoveAndExec(this) :        // self-help
362	<	p.tryHelpStealer(w, this))        // help process tasks
363	<	k = HELP_RETRIES;                 // reset if made progress
364	<	else if ((s = status) < 0)            // recheck
365	<	break;
366	<	else if (--k > 0) {
367	<	if ((k & 3) == 1)
368	<	Thread.yield();               // occasionally yield
369	<	}
370	<	else if (k == 0)
371	<	p.tryPollForAndExec(w, this);     // uncommon self-help case
372	<	else if (p.tryCompensate()) {         // true if can block
373	<	try {
374	<	int ss = status;
375	<	if (ss >= 0 &&                // assert need signal
376	<	U.compareAndSwapInt(this, STATUS, ss, ss | SIGNAL)) {
377	<	synchronized (this) {
378	<	if (status >= 0)      // block
379	<	wait();
380	<	}
381	<	}
382	<	} catch (InterruptedException ignore) {
383	<	} finally {
384	<	p.incrementActiveCount();     // re-activate
385	<	}
386	<	}
387	<	}
388	<	w.currentJoin = prevJoin;
389	<	return s;
344	>	return (s = status) < 0 ? s :
345	>	((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) ?
346	>	(w = (wt = (ForkJoinWorkerThread)t).workQueue).
347	>	tryUnpush(this) && (s = doExec()) < 0 ? s :
348	>	wt.pool.awaitJoin(w, this) :
349	>	externalAwaitDone();
350		}
351
352		/**
#	Line 395 | Line 355 | public abstract class ForkJoinTask<V> im
355		* @return status upon completion
356		*/
357		private int doInvoke() {
358	<	int s; Thread t;
359	<	if ((s = doExec()) >= 0) {
360	<	if (!((t = Thread.currentThread()) instanceof ForkJoinWorkerThread))
361	<	s = externalAwaitDone();
362	<	else {
403	<	ForkJoinWorkerThread wt = (ForkJoinWorkerThread)t;
404	<	s = awaitJoin(wt.workQueue, wt.pool);
405	<	}
406	<	}
407	<	return s;
358	>	int s; Thread t; ForkJoinWorkerThread wt;
359	>	return (s = doExec()) < 0 ? s :
360	>	((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) ?
361	>	(wt = (ForkJoinWorkerThread)t).pool.awaitJoin(wt.workQueue, this) :
362	>	externalAwaitDone();
363		}
364
365		// Exception table support
#	Line 439 | Line 394 | public abstract class ForkJoinTask<V> im
394		* any ForkJoinPool will call helpExpungeStaleExceptions when its
395		* pool becomes isQuiescent.
396		*/
397	<	static final class ExceptionNode extends WeakReference<ForkJoinTask<?>>{
397	>	static final class ExceptionNode extends WeakReference<ForkJoinTask<?>> {
398		final Throwable ex;
399		ExceptionNode next;
400		final long thrower;  // use id not ref to avoid weak cycles
#	Line 452 | Line 407 | public abstract class ForkJoinTask<V> im
407		}
408
409		/**
410	<	* Records exception and sets exceptional completion.
410	>	* Records exception and sets status.
411		*
412		* @return status on exit
413		*/
414	<	private int setExceptionalCompletion(Throwable ex) {
415	<	int h = System.identityHashCode(this);
416	<	final ReentrantLock lock = exceptionTableLock;
417	<	lock.lock();
418	<	try {
419	<	expungeStaleExceptions();
420	<	ExceptionNode[] t = exceptionTable;
421	<	int i = h & (t.length - 1);
422	<	for (ExceptionNode e = t[i]; ; e = e.next) {
423	<	if (e == null) {
424	<	t[i] = new ExceptionNode(this, ex, t[i]);
425	<	break;
414	>	final int recordExceptionalCompletion(Throwable ex) {
415	>	int s;
416	>	if ((s = status) >= 0) {
417	>	int h = System.identityHashCode(this);
418	>	final ReentrantLock lock = exceptionTableLock;
419	>	lock.lock();
420	>	try {
421	>	expungeStaleExceptions();
422	>	ExceptionNode[] t = exceptionTable;
423	>	int i = h & (t.length - 1);
424	>	for (ExceptionNode e = t[i]; ; e = e.next) {
425	>	if (e == null) {
426	>	t[i] = new ExceptionNode(this, ex, t[i]);
427	>	break;
428	>	}
429	>	if (e.get() == this) // already present
430	>	break;
431		}
432	<	if (e.get() == this) // already present
433	<	break;
432	>	} finally {
433	>	lock.unlock();
434		}
435	<	} finally {
476	<	lock.unlock();
435	>	s = setCompletion(EXCEPTIONAL);
436		}
437	<	return setCompletion(EXCEPTIONAL);
437	>	return s;
438	>	}
439	>
440	>	/**
441	>	* Records exception and possibly propagates
442	>	*
443	>	* @return status on exit
444	>	*/
445	>	private int setExceptionalCompletion(Throwable ex) {
446	>	int s = recordExceptionalCompletion(ex);
447	>	if ((s & DONE_MASK) == EXCEPTIONAL)
448	>	internalPropagateException(ex);
449	>	return s;
450	>	}
451	>
452	>	/**
453	>	* Hook for exception propagation support for tasks with completers.
454	>	*/
455	>	void internalPropagateException(Throwable ex) {
456		}
457
458		/**
#	Line 539 | Line 516 | public abstract class ForkJoinTask<V> im
516		* @return the exception, or null if none
517		*/
518		private Throwable getThrowableException() {
519	<	if (status != EXCEPTIONAL)
519	>	if ((status & DONE_MASK) != EXCEPTIONAL)
520		return null;
521		int h = System.identityHashCode(this);
522		ExceptionNode e;
#	Line 557 | Line 534 | public abstract class ForkJoinTask<V> im
534		Throwable ex;
535		if (e == null || (ex = e.ex) == null)
536		return null;
537	<	if (e.thrower != Thread.currentThread().getId()) {
537	>	if (false && e.thrower != Thread.currentThread().getId()) {
538		Class<? extends Throwable> ec = ex.getClass();
539		try {
540		Constructor<?> noArgCtor = null;
#	Line 624 | Line 601 | public abstract class ForkJoinTask<V> im
601		}
602
603		/**
604	<	* Report the result of invoke or join; called only upon
628	<	* non-normal return of internal versions.
604	>	* Throws exception, if any, associated with the given status.
605		*/
606	<	private V reportResult() {
607	<	int s; Throwable ex;
608	<	if ((s = status) == CANCELLED)
609	<	throw new CancellationException();
610	<	if (s == EXCEPTIONAL && (ex = getThrowableException()) != null)
606	>	private void reportException(int s) {
607	>	Throwable ex = ((s == CANCELLED) ?  new CancellationException() :
608	>	(s == EXCEPTIONAL) ? getThrowableException() :
609	>	null);
610	>	if (ex != null)
611		U.throwException(ex);
636	–	return getRawResult();
612		}
613
614		// public methods
615
616		/**
617	<	* Arranges to asynchronously execute this task.  While it is not
618	<	* necessarily enforced, it is a usage error to fork a task more
619	<	* than once unless it has completed and been reinitialized.
620	<	* Subsequent modifications to the state of this task or any data
621	<	* it operates on are not necessarily consistently observable by
622	<	* any thread other than the one executing it unless preceded by a
623	<	* call to {@link #join} or related methods, or a call to {@link
624	<	* #isDone} returning {@code true}.
625	<	*
626	<	* <p>This method may be invoked only from within {@code
627	<	* ForkJoinPool} computations (as may be determined using method
653	<	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
654	<	* result in exceptions or errors, possibly including {@code
655	<	* ClassCastException}.
617	>	* Arranges to asynchronously execute this task in the pool the
618	>	* current task is running in, if applicable, or using the {@link
619	>	* ForkJoinPool#commonPool} if not {@link #inForkJoinPool}.  While
620	>	* it is not necessarily enforced, it is a usage error to fork a
621	>	* task more than once unless it has completed and been
622	>	* reinitialized.  Subsequent modifications to the state of this
623	>	* task or any data it operates on are not necessarily
624	>	* consistently observable by any thread other than the one
625	>	* executing it unless preceded by a call to {@link #join} or
626	>	* related methods, or a call to {@link #isDone} returning {@code
627	>	* true}.
628		*
629		* @return {@code this}, to simplify usage
630		*/
631		public final ForkJoinTask<V> fork() {
632	<	ForkJoinWorkerThread wt;
633	<	(wt = (ForkJoinWorkerThread)Thread.currentThread()).
634	<	workQueue.push(this, wt.pool);
632	>	Thread t;
633	>	if ((t = Thread.currentThread()) instanceof ForkJoinWorkerThread)
634	>	((ForkJoinWorkerThread)t).workQueue.push(this);
635	>	else
636	>	ForkJoinPool.submitToCommonPool(this);
637		return this;
638		}
639
#	Line 675 | Line 649 | public abstract class ForkJoinTask<V> im
649		* @return the computed result
650		*/
651		public final V join() {
652	<	if (doJoin() != NORMAL)
653	<	return reportResult();
654	<	else
655	<	return getRawResult();
652	>	int s;
653	>	if ((s = doJoin() & DONE_MASK) != NORMAL)
654	>	reportException(s);
655	>	return getRawResult();
656		}
657
658		/**
#	Line 690 | Line 664 | public abstract class ForkJoinTask<V> im
664		* @return the computed result
665		*/
666		public final V invoke() {
667	<	if (doInvoke() != NORMAL)
668	<	return reportResult();
669	<	else
670	<	return getRawResult();
667	>	int s;
668	>	if ((s = doInvoke() & DONE_MASK) != NORMAL)
669	>	reportException(s);
670	>	return getRawResult();
671		}
672
673		/**
#	Line 709 | Line 683 | public abstract class ForkJoinTask<V> im
683		* cancelled, completed normally or exceptionally, or left
684		* unprocessed.
685		*
712	–	* <p>This method may be invoked only from within {@code
713	–	* ForkJoinPool} computations (as may be determined using method
714	–	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
715	–	* result in exceptions or errors, possibly including {@code
716	–	* ClassCastException}.
717	–	*
686		* @param t1 the first task
687		* @param t2 the second task
688		* @throws NullPointerException if any task is null
689		*/
690		public static void invokeAll(ForkJoinTask<?> t1, ForkJoinTask<?> t2) {
691	+	int s1, s2;
692		t2.fork();
693	<	t1.invoke();
694	<	t2.join();
693	>	if ((s1 = t1.doInvoke() & DONE_MASK) != NORMAL)
694	>	t1.reportException(s1);
695	>	if ((s2 = t2.doJoin() & DONE_MASK) != NORMAL)
696	>	t2.reportException(s2);
697		}
698
699		/**
#	Line 737 | Line 708 | public abstract class ForkJoinTask<V> im
708		* related methods to check if they have been cancelled, completed
709		* normally or exceptionally, or left unprocessed.
710		*
740	–	* <p>This method may be invoked only from within {@code
741	–	* ForkJoinPool} computations (as may be determined using method
742	–	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
743	–	* result in exceptions or errors, possibly including {@code
744	–	* ClassCastException}.
745	–	*
711		* @param tasks the tasks
712		* @throws NullPointerException if any task is null
713		*/
#	Line 786 | Line 751 | public abstract class ForkJoinTask<V> im
751		* cancelled, completed normally or exceptionally, or left
752		* unprocessed.
753		*
789	–	* <p>This method may be invoked only from within {@code
790	–	* ForkJoinPool} computations (as may be determined using method
791	–	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
792	–	* result in exceptions or errors, possibly including {@code
793	–	* ClassCastException}.
794	–	*
754		* @param tasks the collection of tasks
755		* @return the tasks argument, to simplify usage
756		* @throws NullPointerException if tasks or any element are null
#	Line 859 | Line 818 | public abstract class ForkJoinTask<V> im
818		* @return {@code true} if this task is now cancelled
819		*/
820		public boolean cancel(boolean mayInterruptIfRunning) {
821	<	return setCompletion(CANCELLED) == CANCELLED;
821	>	return (setCompletion(CANCELLED) & DONE_MASK) == CANCELLED;
822		}
823
824		public final boolean isDone() {
#	Line 867 | Line 826 | public abstract class ForkJoinTask<V> im
826		}
827
828		public final boolean isCancelled() {
829	<	return status == CANCELLED;
829	>	return (status & DONE_MASK) == CANCELLED;
830		}
831
832		/**
#	Line 887 | Line 846 | public abstract class ForkJoinTask<V> im
846		* exception and was not cancelled
847		*/
848		public final boolean isCompletedNormally() {
849	<	return status == NORMAL;
849	>	return (status & DONE_MASK) == NORMAL;
850		}
851
852		/**
#	Line 898 | Line 857 | public abstract class ForkJoinTask<V> im
857		* @return the exception, or {@code null} if none
858		*/
859		public final Throwable getException() {
860	<	int s = status;
860	>	int s = status & DONE_MASK;
861		return ((s >= NORMAL)    ? null :
862		(s == CANCELLED) ? new CancellationException() :
863		getThrowableException());
#	Line 948 | Line 907 | public abstract class ForkJoinTask<V> im
907		}
908
909		/**
910	+	* Completes this task normally without setting a value. The most
911	+	* recent value established by {@link #setRawResult} (or {@code
912	+	* null} by default) will be returned as the result of subsequent
913	+	* invocations of {@code join} and related operations.
914	+	*
915	+	* @since 1.8
916	+	*/
917	+	public final void quietlyComplete() {
918	+	setCompletion(NORMAL);
919	+	}
920	+
921	+	/**
922		* Waits if necessary for the computation to complete, and then
923		* retrieves its result.
924		*
#	Line 960 | Line 931 | public abstract class ForkJoinTask<V> im
931		*/
932		public final V get() throws InterruptedException, ExecutionException {
933		int s = (Thread.currentThread() instanceof ForkJoinWorkerThread) ?
934	<	doJoin() : externalInterruptibleAwaitDone(0L);
934	>	doJoin() : externalInterruptibleAwaitDone();
935		Throwable ex;
936	<	if (s == CANCELLED)
936	>	if ((s &= DONE_MASK) == CANCELLED)
937		throw new CancellationException();
938		if (s == EXCEPTIONAL && (ex = getThrowableException()) != null)
939		throw new ExecutionException(ex);
#	Line 985 | Line 956 | public abstract class ForkJoinTask<V> im
956		*/
957		public final V get(long timeout, TimeUnit unit)
958		throws InterruptedException, ExecutionException, TimeoutException {
959	<	// Messy in part because we measure in nanos, but wait in millis
960	<	int s; long millis, nanos;
961	<	Thread t = Thread.currentThread();
962	<	if (!(t instanceof ForkJoinWorkerThread)) {
963	<	if ((millis = unit.toMillis(timeout)) > 0L)
964	<	s = externalInterruptibleAwaitDone(millis);
965	<	else
966	<	s = status;
967	<	}
968	<	else if ((s = status) >= 0 && (nanos = unit.toNanos(timeout)) > 0L) {
969	<	long deadline = System.nanoTime() + nanos;
970	<	ForkJoinWorkerThread wt = (ForkJoinWorkerThread)t;
971	<	ForkJoinPool.WorkQueue w = wt.workQueue;
972	<	ForkJoinPool p = wt.pool;
973	<	if (w.tryUnpush(this))
974	<	doExec();
975	<	boolean blocking = false;
959	>	if (Thread.interrupted())
960	>	throw new InterruptedException();
961	>	// Messy in part because we measure in nanosecs, but wait in millisecs
962	>	int s; long ns, ms;
963	>	if ((s = status) >= 0 && (ns = unit.toNanos(timeout)) > 0L) {
964	>	long deadline = System.nanoTime() + ns;
965	>	ForkJoinPool p = null;
966	>	ForkJoinPool.WorkQueue w = null;
967	>	Thread t = Thread.currentThread();
968	>	if (t instanceof ForkJoinWorkerThread) {
969	>	ForkJoinWorkerThread wt = (ForkJoinWorkerThread)t;
970	>	p = wt.pool;
971	>	w = wt.workQueue;
972	>	s = p.helpJoinOnce(w, this); // no retries on failure
973	>	}
974	>	boolean canBlock = false;
975	>	boolean interrupted = false;
976		try {
977		while ((s = status) >= 0) {
978	<	if (w.runState < 0)
978	>	if (w != null && w.runState < 0)
979		cancelIgnoringExceptions(this);
980	<	else if (!blocking)
981	<	blocking = p.tryCompensate();
980	>	else if (!canBlock) {
981	>	if (p == null || p.tryCompensate(this, null))
982	>	canBlock = true;
983	>	}
984		else {
985	<	millis = TimeUnit.NANOSECONDS.toMillis(nanos);
1013	<	if (millis > 0L &&
985	>	if ((ms = TimeUnit.NANOSECONDS.toMillis(ns)) > 0L &&
986		U.compareAndSwapInt(this, STATUS, s, s | SIGNAL)) {
987	<	try {
988	<	synchronized (this) {
989	<	if (status >= 0)
990	<	wait(millis);
987	>	synchronized (this) {
988	>	if (status >= 0) {
989	>	try {
990	>	wait(ms);
991	>	} catch (InterruptedException ie) {
992	>	if (p == null)
993	>	interrupted = true;
994	>	}
995		}
996	<	} catch (InterruptedException ie) {
996	>	else
997	>	notifyAll();
998		}
999		}
1000	<	if ((s = status) < 0 ||
1001	<	(nanos = deadline - System.nanoTime()) <= 0L)
1000	>	if ((s = status) < 0 || interrupted ||
1001	>	(ns = deadline - System.nanoTime()) <= 0L)
1002		break;
1003		}
1004		}
1005		} finally {
1006	<	if (blocking)
1006	>	if (p != null && canBlock)
1007		p.incrementActiveCount();
1008		}
1009	+	if (interrupted)
1010	+	throw new InterruptedException();
1011		}
1012	<	if (s != NORMAL) {
1012	>	if ((s &= DONE_MASK) != NORMAL) {
1013		Throwable ex;
1014		if (s == CANCELLED)
1015		throw new CancellationException();
#	Line 1067 | Line 1046 | public abstract class ForkJoinTask<V> im
1046		* be of use in designs in which many tasks are forked, but none
1047		* are explicitly joined, instead executing them until all are
1048		* processed.
1070	–	*
1071	–	* <p>This method may be invoked only from within {@code
1072	–	* ForkJoinPool} computations (as may be determined using method
1073	–	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
1074	–	* result in exceptions or errors, possibly including {@code
1075	–	* ClassCastException}.
1049		*/
1050		public static void helpQuiesce() {
1051	<	ForkJoinWorkerThread wt =
1052	<	(ForkJoinWorkerThread)Thread.currentThread();
1053	<	wt.pool.helpQuiescePool(wt.workQueue);
1051	>	Thread t;
1052	>	if ((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) {
1053	>	ForkJoinWorkerThread wt = (ForkJoinWorkerThread)t;
1054	>	wt.pool.helpQuiescePool(wt.workQueue);
1055	>	}
1056	>	else
1057	>	ForkJoinPool.externalHelpQuiescePool();
1058		}
1059
1060		/**
#	Line 1097 | Line 1074 | public abstract class ForkJoinTask<V> im
1074		* setRawResult(null)}.
1075		*/
1076		public void reinitialize() {
1077	<	if (status == EXCEPTIONAL)
1077	>	if ((status & DONE_MASK) == EXCEPTIONAL)
1078		clearExceptionalCompletion();
1079		else
1080		status = 0;
#	Line 1130 | Line 1107 | public abstract class ForkJoinTask<V> im
1107
1108		/**
1109		* Tries to unschedule this task for execution. This method will
1110	<	* typically succeed if this task is the most recently forked task
1111	<	* by the current thread, and has not commenced executing in
1112	<	* another thread.  This method may be useful when arranging
1113	<	* alternative local processing of tasks that could have been, but
1114	<	* were not, stolen.
1138	<	*
1139	<	* <p>This method may be invoked only from within {@code
1140	<	* ForkJoinPool} computations (as may be determined using method
1141	<	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
1142	<	* result in exceptions or errors, possibly including {@code
1143	<	* ClassCastException}.
1110	>	* typically (but is not guaranteed to) succeed if this task is
1111	>	* the most recently forked task by the current thread, and has
1112	>	* not commenced executing in another thread.  This method may be
1113	>	* useful when arranging alternative local processing of tasks
1114	>	* that could have been, but were not, stolen.
1115		*
1116		* @return {@code true} if unforked
1117		*/
1118		public boolean tryUnfork() {
1119	<	return ((ForkJoinWorkerThread)Thread.currentThread())
1120	<	.workQueue.tryUnpush(this);
1119	>	Thread t;
1120	>	return ((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) ?
1121	>	((ForkJoinWorkerThread)t).workQueue.tryUnpush(this) :
1122	>	ForkJoinPool.tryUnsubmitFromCommonPool(this);
1123		}
1124
1125		/**
#	Line 1155 | Line 1128 | public abstract class ForkJoinTask<V> im
1128		* value may be useful for heuristic decisions about whether to
1129		* fork other tasks.
1130		*
1158	–	* <p>This method may be invoked only from within {@code
1159	–	* ForkJoinPool} computations (as may be determined using method
1160	–	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
1161	–	* result in exceptions or errors, possibly including {@code
1162	–	* ClassCastException}.
1163	–	*
1131		* @return the number of tasks
1132		*/
1133		public static int getQueuedTaskCount() {
1134	<	return ((ForkJoinWorkerThread) Thread.currentThread())
1135	<	.workQueue.queueSize();
1134	>	Thread t;
1135	>	return ((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) ?
1136	>	((ForkJoinWorkerThread)t).workQueue.queueSize() :
1137	>	ForkJoinPool.getEstimatedSubmitterQueueLength();
1138		}
1139
1140		/**
1141		* Returns an estimate of how many more locally queued tasks are
1142		* held by the current worker thread than there are other worker
1143	<	* threads that might steal them.  This value may be useful for
1143	>	* threads that might steal them, or zero if this thread is not
1144	>	* operating in a ForkJoinPool. This value may be useful for
1145		* heuristic decisions about whether to fork other tasks. In many
1146		* usages of ForkJoinTasks, at steady state, each worker should
1147		* aim to maintain a small constant surplus (for example, 3) of
1148		* tasks, and to process computations locally if this threshold is
1149		* exceeded.
1150		*
1181	–	* <p>This method may be invoked only from within {@code
1182	–	* ForkJoinPool} computations (as may be determined using method
1183	–	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
1184	–	* result in exceptions or errors, possibly including {@code
1185	–	* ClassCastException}.
1186	–	*
1151		* @return the surplus number of tasks, which may be negative
1152		*/
1153		public static int getSurplusQueuedTaskCount() {
#	Line 1230 | Line 1194 | public abstract class ForkJoinTask<V> im
1194		* have zero queued tasks, so compensate by a factor of
1195		* (#idle/#active) threads.
1196		*/
1197	<	ForkJoinWorkerThread wt =
1198	<	(ForkJoinWorkerThread)Thread.currentThread();
1199	<	return wt.workQueue.queueSize() - wt.pool.idlePerActive();
1197	>	Thread t; ForkJoinWorkerThread wt;
1198	>	return ((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) ?
1199	>	(wt = (ForkJoinWorkerThread)t).workQueue.queueSize() - wt.pool.idlePerActive() :
1200	>	0;
1201		}
1202
1203		// Extension methods
#	Line 1258 | Line 1223 | public abstract class ForkJoinTask<V> im
1223		protected abstract void setRawResult(V value);
1224
1225		/**
1226	<	* Immediately performs the base action of this task.  This method
1227	<	* is designed to support extensions, and should not in general be
1228	<	* called otherwise. The return value controls whether this task
1229	<	* is considered to be done normally. It may return false in
1226	>	* Immediately performs the base action of this task and returns
1227	>	* true if, upon return from this method, this task is guaranteed
1228	>	* to have completed normally. This method may return false
1229	>	* otherwise, to indicate that this task is not necessarily
1230	>	* complete (or is not known to be complete), for example in
1231		* asynchronous actions that require explicit invocations of
1232	<	* {@link #complete} to become joinable. It may also throw an
1233	<	* (unchecked) exception to indicate abnormal exit.
1232	>	* completion methods. This method may also throw an (unchecked)
1233	>	* exception to indicate abnormal exit. This method is designed to
1234	>	* support extensions, and should not in general be called
1235	>	* otherwise.
1236		*
1237	<	* @return {@code true} if completed normally
1237	>	* @return {@code true} if this task is known to have completed normally
1238		*/
1239		protected abstract boolean exec();
1240
1241		/**
1242		* Returns, but does not unschedule or execute, a task queued by
1243		* the current thread but not yet executed, if one is immediately
1244	<	* available. There is no guarantee that this task will actually
1245	<	* be polled or executed next. Conversely, this method may return
1246	<	* null even if a task exists but cannot be accessed without
1247	<	* contention with other threads.  This method is designed
1244	>	* available and the current thread is operating in a
1245	>	* ForkJoinPool. There is no guarantee that this task will
1246	>	* actually be polled or executed next. Conversely, this method
1247	>	* may return null even if a task exists but cannot be accessed
1248	>	* without contention with other threads.  This method is designed
1249		* primarily to support extensions, and is unlikely to be useful
1250		* otherwise.
1251		*
1283	–	* <p>This method may be invoked only from within {@code
1284	–	* ForkJoinPool} computations (as may be determined using method
1285	–	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
1286	–	* result in exceptions or errors, possibly including {@code
1287	–	* ClassCastException}.
1288	–	*
1252		* @return the next task, or {@code null} if none are available
1253		*/
1254		protected static ForkJoinTask<?> peekNextLocalTask() {
1255	<	return ((ForkJoinWorkerThread) Thread.currentThread()).workQueue.peek();
1255	>	Thread t;
1256	>	return ((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) ?
1257	>	((ForkJoinWorkerThread)t).workQueue.peek() :
1258	>	null;
1259		}
1260
1261		/**
1262		* Unschedules and returns, without executing, the next task
1263	<	* queued by the current thread but not yet executed.  This method
1264	<	* is designed primarily to support extensions, and is unlikely to
1265	<	* be useful otherwise.
1266	<	*
1301	<	* <p>This method may be invoked only from within {@code
1302	<	* ForkJoinPool} computations (as may be determined using method
1303	<	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
1304	<	* result in exceptions or errors, possibly including {@code
1305	<	* ClassCastException}.
1263	>	* queued by the current thread but not yet executed, if the
1264	>	* current thread is operating in a ForkJoinPool.  This method is
1265	>	* designed primarily to support extensions, and is unlikely to be
1266	>	* useful otherwise.
1267		*
1268		* @return the next task, or {@code null} if none are available
1269		*/
1270		protected static ForkJoinTask<?> pollNextLocalTask() {
1271	<	return ((ForkJoinWorkerThread) Thread.currentThread())
1272	<	.workQueue.nextLocalTask();
1271	>	Thread t;
1272	>	return ((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) ?
1273	>	((ForkJoinWorkerThread)t).workQueue.nextLocalTask() :
1274	>	null;
1275		}
1276
1277		/**
1278	<	* Unschedules and returns, without executing, the next task
1278	>	* If the current thread is operating in a ForkJoinPool,
1279	>	* unschedules and returns, without executing, the next task
1280		* queued by the current thread but not yet executed, if one is
1281		* available, or if not available, a task that was forked by some
1282		* other thread, if available. Availability may be transient, so a
1283	<	* {@code null} result does not necessarily imply quiescence
1284	<	* of the pool this task is operating in.  This method is designed
1283	>	* {@code null} result does not necessarily imply quiescence of
1284	>	* the pool this task is operating in.  This method is designed
1285		* primarily to support extensions, and is unlikely to be useful
1286		* otherwise.
1287		*
1324	–	* <p>This method may be invoked only from within {@code
1325	–	* ForkJoinPool} computations (as may be determined using method
1326	–	* {@link #inForkJoinPool}).  Attempts to invoke in other contexts
1327	–	* result in exceptions or errors, possibly including {@code
1328	–	* ClassCastException}.
1329	–	*
1288		* @return a task, or {@code null} if none are available
1289		*/
1290		protected static ForkJoinTask<?> pollTask() {
1291	<	ForkJoinWorkerThread wt =
1292	<	(ForkJoinWorkerThread)Thread.currentThread();
1293	<	return wt.pool.nextTaskFor(wt.workQueue);
1291	>	Thread t; ForkJoinWorkerThread wt;
1292	>	return ((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) ?
1293	>	(wt = (ForkJoinWorkerThread)t).pool.nextTaskFor(wt.workQueue) :
1294	>	null;
1295		}
1296
1297	<	// Mark-bit operations
1297	>	// tag operations
1298
1299		/**
1300	<	* Returns true if this task is marked.
1300	>	* Returns the tag for this task.
1301		*
1302	<	* @return true if this task is marked
1302	>	* @return the tag for this task
1303		* @since 1.8
1304		*/
1305	<	public final boolean isMarkedForkJoinTask() {
1306	<	return (status & MARKED) != 0;
1305	>	public final short getForkJoinTaskTag() {
1306	>	return (short)status;
1307		}
1308
1309		/**
1310	<	* Atomically sets the mark on this task.
1310	>	* Atomically sets the tag value for this task.
1311		*
1312	<	* @return true if this task was previously unmarked
1312	>	* @param tag the tag value
1313	>	* @return the previous value of the tag
1314		* @since 1.8
1315		*/
1316	<	public final boolean markForkJoinTask() {
1316	>	public final short setForkJoinTaskTag(short tag) {
1317		for (int s;;) {
1318	<	if (((s = status) & MARKED) != 0)
1319	<	return false;
1320	<	if (U.compareAndSwapInt(this, STATUS, s, s | MARKED))
1361	<	return true;
1318	>	if (U.compareAndSwapInt(this, STATUS, s = status,
1319	>	(s & ~SMASK) | (tag & SMASK)))
1320	>	return (short)s;
1321		}
1322		}
1323
1324		/**
1325	<	* Atomically clears the mark on this task.
1325	>	* Atomically conditionally sets the tag value for this task.
1326	>	* Among other applications, tags can be used as visit markers
1327	>	* in tasks operating on graphs, as in methods that check: {@code
1328	>	* if (task.compareAndSetForkJoinTaskTag((short)0, (short)1))}
1329	>	* before processing, otherwise exiting because the node has
1330	>	* already been visited.
1331		*
1332	<	* @return true if this task was previously marked
1332	>	* @param e the expected tag value
1333	>	* @param tag the new tag value
1334	>	* @return true if successful; i.e., the current value was
1335	>	* equal to e and is now tag.
1336		* @since 1.8
1337		*/
1338	<	public final boolean unmarkForkJoinTask() {
1338	>	public final boolean compareAndSetForkJoinTaskTag(short e, short tag) {
1339		for (int s;;) {
1340	<	if (((s = status) & MARKED) == 0)
1340	>	if ((short)(s = status) != e)
1341		return false;
1342	<	if (U.compareAndSwapInt(this, STATUS, s, s & ~MARKED))
1342	>	if (U.compareAndSwapInt(this, STATUS, s,
1343	>	(s & ~SMASK) | (tag & SMASK)))
1344		return true;
1345		}
1346		}
#	Line 1385 | Line 1353 | public abstract class ForkJoinTask<V> im
1353		static final class AdaptedRunnable<T> extends ForkJoinTask<T>
1354		implements RunnableFuture<T> {
1355		final Runnable runnable;
1388	–	final T resultOnCompletion;
1356		T result;
1357		AdaptedRunnable(Runnable runnable, T result) {
1358		if (runnable == null) throw new NullPointerException();
1359		this.runnable = runnable;
1360	<	this.resultOnCompletion = result;
1360	>	this.result = result; // OK to set this even before completion
1361		}
1362	<	public T getRawResult() { return result; }
1363	<	public void setRawResult(T v) { result = v; }
1364	<	public boolean exec() {
1365	<	runnable.run();
1366	<	result = resultOnCompletion;
1367	<	return true;
1362	>	public final T getRawResult() { return result; }
1363	>	public final void setRawResult(T v) { result = v; }
1364	>	public final boolean exec() { runnable.run(); return true; }
1365	>	public final void run() { invoke(); }
1366	>	private static final long serialVersionUID = 5232453952276885070L;
1367	>	}
1368	>
1369	>	/**
1370	>	* Adaptor for Runnables without results
1371	>	*/
1372	>	static final class AdaptedRunnableAction extends ForkJoinTask<Void>
1373	>	implements RunnableFuture<Void> {
1374	>	final Runnable runnable;
1375	>	AdaptedRunnableAction(Runnable runnable) {
1376	>	if (runnable == null) throw new NullPointerException();
1377	>	this.runnable = runnable;
1378		}
1379	<	public void run() { invoke(); }
1379	>	public final Void getRawResult() { return null; }
1380	>	public final void setRawResult(Void v) { }
1381	>	public final boolean exec() { runnable.run(); return true; }
1382	>	public final void run() { invoke(); }
1383		private static final long serialVersionUID = 5232453952276885070L;
1384		}
1385
#	Line 1414 | Line 1394 | public abstract class ForkJoinTask<V> im
1394		if (callable == null) throw new NullPointerException();
1395		this.callable = callable;
1396		}
1397	<	public T getRawResult() { return result; }
1398	<	public void setRawResult(T v) { result = v; }
1399	<	public boolean exec() {
1397	>	public final T getRawResult() { return result; }
1398	>	public final void setRawResult(T v) { result = v; }
1399	>	public final boolean exec() {
1400		try {
1401		result = callable.call();
1402		return true;
#	Line 1428 | Line 1408 | public abstract class ForkJoinTask<V> im
1408		throw new RuntimeException(ex);
1409		}
1410		}
1411	<	public void run() { invoke(); }
1411	>	public final void run() { invoke(); }
1412		private static final long serialVersionUID = 2838392045355241008L;
1413		}
1414
#	Line 1441 | Line 1421 | public abstract class ForkJoinTask<V> im
1421		* @return the task
1422		*/
1423		public static ForkJoinTask<?> adapt(Runnable runnable) {
1424	<	return new AdaptedRunnable<Void>(runnable, null);
1424	>	return new AdaptedRunnableAction(runnable);
1425		}
1426
1427		/**

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