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

Comparing jsr166/src/jsr166y/ForkJoinTask.java (file contents):
Revision 1.18 by dl, Sat Jul 25 15:50:57 2009 UTC vs.
Revision 1.27 by dl, Sun Aug 2 11:54:31 2009 UTC

#	Line 16 | Line 16 | 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.
#	Line 25 | Line 25 | import java.util.WeakHashMap;
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.
28	>	* programs using ForkJoinTasks employ only methods {@code fork} and
29	>	* {@code join}, or derivatives such as {@code invokeAll}.  However,
30	>	* this class also provides a number of other methods that can come
31	>	* into play in advanced usages, as well as extension mechanics that
32	>	* allow support of new forms of fork/join processing.
33		*
34		* <p>A ForkJoinTask is a lightweight form of {@link Future}.  The
35		* efficiency of ForkJoinTasks stems from a set of restrictions (that
#	Line 77 | Line 76 | import java.util.WeakHashMap;
76		*
77		* <p> The ForkJoinTask class is not usually directly subclassed.
78		* Instead, you subclass one of the abstract classes that support a
79	<	* particular style of fork/join processing.  Normally, a concrete
79	>	* particular style of fork/join processing, typically {@link
80	>	* RecursiveAction} for computations that do not return results, or
81	>	* {@link RecursiveTask} for those that do.  Normally, a concrete
82		* ForkJoinTask subclass declares fields comprising its parameters,
83		* established in a constructor, and then defines a {@code compute}
84		* method that somehow uses the control methods supplied by this base
#	Line 94 | Line 95 | import java.util.WeakHashMap;
95		* lightweight task scheduling framework, and so cannot be overridden.
96		* Developers creating new basic styles of fork/join processing should
97		* minimally implement {@code protected} methods
98	<	* {@code exec}, {@code setRawResult}, and
99	<	* {@code getRawResult}, while also introducing an abstract
98	>	* {@link #exec}, {@link #setRawResult}, and
99	>	* {@link #getRawResult}, while also introducing an abstract
100		* computational method that can be implemented in its subclasses,
101		* possibly relying on other {@code protected} methods provided
102		* by this class.
#	Line 107 | Line 108 | import java.util.WeakHashMap;
108		* parallelism cannot improve throughput. If too small, then memory
109		* and internal task maintenance overhead may overwhelm processing.
110		*
111	+	* <p>This class provides {@code adapt} methods for {@link
112	+	* java.lang.Runnable} and {@link java.util.concurrent.Callable}, that
113	+	* may be of use when mixing execution of ForkJoinTasks with other
114	+	* kinds of tasks. When all tasks are of this form, consider using a
115	+	* pool in {@link ForkJoinPool#setAsyncMode}.
116	+	*
117		* <p>ForkJoinTasks are {@code Serializable}, which enables them
118		* to be used in extensions such as remote execution frameworks. It is
119		* in general sensible to serialize tasks only before or after, but
#	Line 248 | Line 255 | public abstract class ForkJoinTask<V> im
255		synchronized (this) {
256		try {
257		while (status >= 0) {
258	<	long nt = nanos - System.nanoTime() - startTime;
258	>	long nt = nanos - (System.nanoTime() - startTime);
259		if (nt <= 0)
260		break;
261		wait(nt / 1000000, (int) (nt % 1000000));
#	Line 493 | Line 500 | public abstract class ForkJoinTask<V> im
500		* #inForkJoinPool}). Attempts to invoke in other contexts result
501		* in exceptions or errors, possibly including ClassCastException.
502		*
503	<	* @return <code>this</code>, to simplify usage.
503	>	* @return {@code this}, to simplify usage.
504		*/
505		public final ForkJoinTask<V> fork() {
506		((ForkJoinWorkerThread) Thread.currentThread())
#	Line 532 | Line 539 | public abstract class ForkJoinTask<V> im
539		}
540
541		/**
542	<	* Forks both tasks, returning when {@code isDone} holds for
543	<	* both of them or an exception is encountered. This method may be
542	>	* Forks the given tasks, returning when {@code isDone} holds for
543	>	* each task or an exception is encountered. This method may be
544		* invoked only from within ForkJoinTask computations (as may be
545		* determined using method {@link #inForkJoinPool}). Attempts to
546		* invoke in other contexts result in exceptions or errors,
547		* possibly including ClassCastException.
548		*
549	<	* @param t1 one task
550	<	* @param t2 the other task
551	<	* @throws NullPointerException if t1 or t2 are null
552	<	* @throws RuntimeException or Error if either task did so
549	>	* @param t1 the first task
550	>	* @param t2 the second task
551	>	* @throws NullPointerException if any task is null
552	>	* @throws RuntimeException or Error if a task did so
553		*/
554		public static void invokeAll(ForkJoinTask<?>t1, ForkJoinTask<?> t2) {
555		t2.fork();
#	Line 551 | Line 558 | public abstract class ForkJoinTask<V> im
558		}
559
560		/**
561	<	* Forks the given tasks, returning when {@code isDone} holds
562	<	* for all of them. If any task encounters an exception, others
563	<	* may be cancelled.  This method may be invoked only from within
561	>	* Forks the given tasks, returning when {@code isDone} holds for
562	>	* each task or an exception is encountered. If any task
563	>	* encounters an exception, others may be, but are not guaranteed
564	>	* to be, cancelled.  This method may be invoked only from within
565		* ForkJoinTask computations (as may be determined using method
566		* {@link #inForkJoinPool}). Attempts to invoke in other contexts
567		* result in exceptions or errors, possibly including
568		* ClassCastException.
569		*
570	<	* @param tasks the array of tasks
570	>	* Overloadings of this method exist for the special cases
571	>	* of one to four arguments.
572	>	*
573	>	* @param tasks the tasks
574		* @throws NullPointerException if tasks or any element are null
575		* @throws RuntimeException or Error if any task did so
576		*/
#	Line 597 | Line 608 | public abstract class ForkJoinTask<V> im
608		}
609
610		/**
611	<	* Forks all tasks in the collection, returning when
612	<	* {@code isDone} holds for all of them. If any task
613	<	* encounters an exception, others may be cancelled.  This method
614	<	* may be invoked only from within ForkJoinTask computations (as
615	<	* may be determined using method {@link
616	<	* #inForkJoinPool}). Attempts to invoke in other contexts result
617	<	* in exceptions or errors, possibly including ClassCastException.
611	>	* Forks all tasks in the collection, returning when {@code
612	>	* isDone} holds for each task or an exception is encountered. If
613	>	* any task encounters an exception, others may be, but are not
614	>	* guaranteed to be, cancelled.  This method may be invoked only
615	>	* from within ForkJoinTask computations (as may be determined
616	>	* using method {@link #inForkJoinPool}). Attempts to invoke in
617	>	* other contexts result in exceptions or errors, possibly
618	>	* including ClassCastException.
619		*
620		* @param tasks the collection of tasks
621	+	* @return the tasks argument, to simplify usage
622		* @throws NullPointerException if tasks or any element are null
623		* @throws RuntimeException or Error if any task did so
624		*/
625	<	public static void invokeAll(Collection<? extends ForkJoinTask<?>> tasks) {
625	>	public static <T extends ForkJoinTask<?>> Collection<T> invokeAll(Collection<T> tasks) {
626		if (!(tasks instanceof List<?>)) {
627		invokeAll(tasks.toArray(new ForkJoinTask<?>[tasks.size()]));
628	<	return;
628	>	return tasks;
629		}
630		@SuppressWarnings("unchecked")
631		List<? extends ForkJoinTask<?>> ts =
#	Line 647 | Line 660 | public abstract class ForkJoinTask<V> im
660		}
661		if (ex != null)
662		rethrowException(ex);
663	+	return tasks;
664		}
665
666		/**
667	<	* Returns true if the computation performed by this task has
668	<	* completed (or has been cancelled).
667	>	* Returns {@code true} if the computation performed by this task
668	>	* has completed (or has been cancelled).
669		*
670	<	* @return true if this computation has completed
670	>	* @return {@code true} if this computation has completed
671		*/
672		public final boolean isDone() {
673		return status < 0;
674		}
675
676		/**
677	<	* Returns true if this task was cancelled.
677	>	* Returns {@code true} if this task was cancelled.
678		*
679	<	* @return true if this task was cancelled
679	>	* @return {@code true} if this task was cancelled
680		*/
681		public final boolean isCancelled() {
682		return (status & COMPLETION_MASK) == CANCELLED;
#	Line 671 | Line 685 | public abstract class ForkJoinTask<V> im
685		/**
686		* Asserts that the results of this task's computation will not be
687		* used. If a cancellation occurs before attempting to execute this
688	<	* task, then execution will be suppressed, {@code isCancelled}
689	<	* will report true, and {@code join} will result in a
688	>	* task, execution will be suppressed, {@link #isCancelled}
689	>	* will report true, and {@link #join} will result in a
690		* {@code CancellationException} being thrown. Otherwise, when
691		* cancellation races with completion, there are no guarantees
692	<	* about whether {@code isCancelled} will report true, whether
693	<	* {@code join} will return normally or via an exception, or
694	<	* whether these behaviors will remain consistent upon repeated
692	>	* about whether {@code isCancelled} will report {@code true},
693	>	* whether {@code join} will return normally or via an exception,
694	>	* or whether these behaviors will remain consistent upon repeated
695		* invocation.
696		*
697		* <p>This method may be overridden in subclasses, but if so, must
#	Line 687 | Line 701 | public abstract class ForkJoinTask<V> im
701		* <p> This method is designed to be invoked by <em>other</em>
702		* tasks. To terminate the current task, you can just return or
703		* throw an unchecked exception from its computation method, or
704	<	* invoke {@code completeExceptionally}.
704	>	* invoke {@link #completeExceptionally}.
705		*
706		* @param mayInterruptIfRunning this value is ignored in the
707		* default implementation because tasks are not in general
708		* cancelled via interruption
709		*
710	<	* @return true if this task is now cancelled
710	>	* @return {@code true} if this task is now cancelled
711		*/
712		public boolean cancel(boolean mayInterruptIfRunning) {
713		setCompletion(CANCELLED);
#	Line 701 | Line 715 | public abstract class ForkJoinTask<V> im
715		}
716
717		/**
718	<	* Returns true if this task threw an exception or was cancelled.
718	>	* Returns {@code true} if this task threw an exception or was cancelled.
719		*
720	<	* @return true if this task threw an exception or was cancelled
720	>	* @return {@code true} if this task threw an exception or was cancelled
721		*/
722		public final boolean isCompletedAbnormally() {
723		return (status & COMPLETION_MASK) < NORMAL;
#	Line 714 | Line 728 | public abstract class ForkJoinTask<V> im
728		* CancellationException if cancelled, or null if none or if the
729		* method has not yet completed.
730		*
731	<	* @return the exception, or null if none
731	>	* @return the exception, or {@code null} if none
732		*/
733		public final Throwable getException() {
734		int s = status & COMPLETION_MASK;
#	Line 731 | Line 745 | public abstract class ForkJoinTask<V> im
745		* {@code join} and related operations. This method may be used
746		* to induce exceptions in asynchronous tasks, or to force
747		* completion of tasks that would not otherwise complete.  Its use
748	<	* in other situations is likely to be wrong.  This method is
748	>	* in other situations is discouraged.  This method is
749		* overridable, but overridden versions must invoke {@code super}
750		* implementation to maintain guarantees.
751		*
#	Line 751 | Line 765 | public abstract class ForkJoinTask<V> im
765		* operations. This method may be used to provide results for
766		* asynchronous tasks, or to provide alternative handling for
767		* tasks that would not otherwise complete normally. Its use in
768	<	* other situations is likely to be wrong. This method is
768	>	* other situations is discouraged. This method is
769		* overridable, but overridden versions must invoke {@code super}
770		* implementation to maintain guarantees.
771		*
#	Line 776 | Line 790 | public abstract class ForkJoinTask<V> im
790
791		public final V get(long timeout, TimeUnit unit)
792		throws InterruptedException, ExecutionException, TimeoutException {
793	+	long nanos = unit.toNanos(timeout);
794		ForkJoinWorkerThread w = getWorker();
795		if (w == null || status < 0 || !w.unpushTask(this) || !tryQuietlyInvoke())
796	<	awaitDone(w, unit.toNanos(timeout));
796	>	awaitDone(w, nanos);
797		return reportTimedFutureResult();
798		}
799
#	Line 850 | Line 865 | public abstract class ForkJoinTask<V> im
865		* Possibly executes tasks until the pool hosting the current task
866		* {@link ForkJoinPool#isQuiescent}. This method may be of use in
867		* designs in which many tasks are forked, but none are explicitly
868	<	* joined, instead executing them until all are processed.
868	>	* joined, instead executing them until all are processed.  This
869	>	* method may be invoked only from within ForkJoinTask
870	>	* computations (as may be determined using method {@link
871	>	* #inForkJoinPool}). Attempts to invoke in other contexts result
872	>	* in exceptions or errors, possibly including ClassCastException.
873		*/
874		public static void helpQuiesce() {
875		((ForkJoinWorkerThread) Thread.currentThread())
#	Line 864 | Line 883 | public abstract class ForkJoinTask<V> im
883		* never been forked, or has been forked, then completed and all
884		* outstanding joins of this task have also completed. Effects
885		* under any other usage conditions are not guaranteed, and are
886	<	* almost surely wrong. This method may be useful when executing
886	>	* discouraged. This method may be useful when executing
887		* pre-constructed trees of subtasks in loops.
888		*/
889		public void reinitialize() {
#	Line 877 | Line 896 | public abstract class ForkJoinTask<V> im
896		* Returns the pool hosting the current task execution, or null
897		* if this task is executing outside of any ForkJoinPool.
898		*
899	<	* @return the pool, or null if none
899	>	* @see #inForkJoinPool
900	>	* @return the pool, or {@code null} if none
901		*/
902		public static ForkJoinPool getPool() {
903		Thread t = Thread.currentThread();
#	Line 908 | Line 928 | public abstract class ForkJoinTask<V> im
928		* result in exceptions or errors, possibly including
929		* ClassCastException.
930		*
931	<	* @return true if unforked
931	>	* @return {@code true} if unforked
932		*/
933		public boolean tryUnfork() {
934		return ((ForkJoinWorkerThread) Thread.currentThread())
#	Line 919 | Line 939 | public abstract class ForkJoinTask<V> im
939		* Returns an estimate of the number of tasks that have been
940		* forked by the current worker thread but not yet executed. This
941		* value may be useful for heuristic decisions about whether to
942	<	* fork other tasks.
943	<	*
942	>	* fork other tasks.  This method may be invoked only from within
943	>	* ForkJoinTask computations (as may be determined using method
944	>	* {@link #inForkJoinPool}). Attempts to invoke in other contexts
945	>	* result in exceptions or errors, possibly including
946	>	* ClassCastException.
947		* @return the number of tasks
948		*/
949		public static int getQueuedTaskCount() {
#	Line 936 | Line 959 | public abstract class ForkJoinTask<V> im
959		* usages of ForkJoinTasks, at steady state, each worker should
960		* aim to maintain a small constant surplus (for example, 3) of
961		* tasks, and to process computations locally if this threshold is
962	<	* exceeded.
963	<	*
962	>	* exceeded.  This method may be invoked only from within
963	>	* ForkJoinTask computations (as may be determined using method
964	>	* {@link #inForkJoinPool}). Attempts to invoke in other contexts
965	>	* result in exceptions or errors, possibly including
966	>	* ClassCastException.  *
967		* @return the surplus number of tasks, which may be negative
968		*/
969		public static int getSurplusQueuedTaskCount() {
#	Line 948 | Line 974 | public abstract class ForkJoinTask<V> im
974		// Extension methods
975
976		/**
977	<	* Returns the result that would be returned by {@code join},
978	<	* even if this task completed abnormally, or null if this task is
979	<	* not known to have been completed.  This method is designed to
980	<	* aid debugging, as well as to support extensions. Its use in any
981	<	* other context is discouraged.
977	>	* Returns the result that would be returned by {@link #join}, even
978	>	* if this task completed abnormally, or {@code null} if this task
979	>	* is not known to have been completed.  This method is designed
980	>	* to aid debugging, as well as to support extensions. Its use in
981	>	* any other context is discouraged.
982		*
983	<	* @return the result, or null if not completed
983	>	* @return the result, or {@code null} if not completed
984		*/
985		public abstract V getRawResult();
986
#	Line 973 | Line 999 | public abstract class ForkJoinTask<V> im
999		* called otherwise. The return value controls whether this task
1000		* is considered to be done normally. It may return false in
1001		* asynchronous actions that require explicit invocations of
1002	<	* {@code complete} to become joinable. It may throw exceptions
1002	>	* {@link #complete} to become joinable. It may throw exceptions
1003		* to indicate abnormal exit.
1004		*
1005	<	* @return true if completed normally
1005	>	* @return {@code true} if completed normally
1006		* @throws Error or RuntimeException if encountered during computation
1007		*/
1008		protected abstract boolean exec();
1009
1010		/**
1011	<	* Returns, but does not unschedule or execute, the task queued by
1012	<	* the current thread but not yet executed, if one is
1011	>	* Returns, but does not unschedule or execute, a task queued by
1012	>	* the current thread but not yet executed, if one is immediately
1013		* available. There is no guarantee that this task will actually
1014	<	* be polled or executed next.  This method is designed primarily
1015	<	* to support extensions, and is unlikely to be useful otherwise.
1016	<	* This method may be invoked only from within ForkJoinTask
1017	<	* computations (as may be determined using method {@link
1018	<	* #inForkJoinPool}). Attempts to invoke in other contexts result
1019	<	* in exceptions or errors, possibly including ClassCastException.
1014	>	* be polled or executed next. Conversely, this method may return
1015	>	* null even if a task exists but cannot be accessed without
1016	>	* contention with other threads.  This method is designed
1017	>	* primarily to support extensions, and is unlikely to be useful
1018	>	* otherwise.  This method may be invoked only from within
1019	>	* ForkJoinTask computations (as may be determined using method
1020	>	* {@link #inForkJoinPool}). Attempts to invoke in other contexts
1021	>	* result in exceptions or errors, possibly including
1022	>	* ClassCastException.
1023		*
1024	<	* @return the next task, or null if none are available
1024	>	* @return the next task, or {@code null} if none are available
1025		*/
1026		protected static ForkJoinTask<?> peekNextLocalTask() {
1027		return ((ForkJoinWorkerThread) Thread.currentThread())
#	Line 1009 | Line 1038 | public abstract class ForkJoinTask<V> im
1038		* contexts result in exceptions or errors, possibly including
1039		* ClassCastException.
1040		*
1041	<	* @return the next task, or null if none are available
1041	>	* @return the next task, or {@code null} if none are available
1042		*/
1043		protected static ForkJoinTask<?> pollNextLocalTask() {
1044		return ((ForkJoinWorkerThread) Thread.currentThread())
#	Line 1030 | Line 1059 | public abstract class ForkJoinTask<V> im
1059		* result in exceptions or errors, possibly including
1060		* ClassCastException.
1061		*
1062	<	* @return a task, or null if none are available
1062	>	* @return a task, or {@code null} if none are available
1063		*/
1064		protected static ForkJoinTask<?> pollTask() {
1065		return ((ForkJoinWorkerThread) Thread.currentThread())
1066		.pollTask();
1067		}
1068
1069	<	// adaptors
1069	>	/**
1070	>	* Adaptor for Runnables. This implements RunnableFuture
1071	>	* to be compliant with AbstractExecutorService constraints
1072	>	* when used in ForkJoinPool.
1073	>	*/
1074	>	static final class AdaptedRunnable<T> extends ForkJoinTask<T>
1075	>	implements RunnableFuture<T> {
1076	>	final Runnable runnable;
1077	>	final T resultOnCompletion;
1078	>	T result;
1079	>	AdaptedRunnable(Runnable runnable, T result) {
1080	>	if (runnable == null) throw new NullPointerException();
1081	>	this.runnable = runnable;
1082	>	this.resultOnCompletion = result;
1083	>	}
1084	>	public T getRawResult() { return result; }
1085	>	public void setRawResult(T v) { result = v; }
1086	>	public boolean exec() {
1087	>	runnable.run();
1088	>	result = resultOnCompletion;
1089	>	return true;
1090	>	}
1091	>	public void run() { invoke(); }
1092	>	private static final long serialVersionUID = 5232453952276885070L;
1093	>	}
1094
1095		/**
1096	<	* Returns a new ForkJoinTask that performs the <code>run</code>
1096	>	* Adaptor for Callables
1097	>	*/
1098	>	static final class AdaptedCallable<T> extends ForkJoinTask<T>
1099	>	implements RunnableFuture<T> {
1100	>	final Callable<? extends T> callable;
1101	>	T result;
1102	>	AdaptedCallable(Callable<? extends T> callable) {
1103	>	if (callable == null) throw new NullPointerException();
1104	>	this.callable = callable;
1105	>	}
1106	>	public T getRawResult() { return result; }
1107	>	public void setRawResult(T v) { result = v; }
1108	>	public boolean exec() {
1109	>	try {
1110	>	result = callable.call();
1111	>	return true;
1112	>	} catch (Error err) {
1113	>	throw err;
1114	>	} catch (RuntimeException rex) {
1115	>	throw rex;
1116	>	} catch (Exception ex) {
1117	>	throw new RuntimeException(ex);
1118	>	}
1119	>	}
1120	>	public void run() { invoke(); }
1121	>	private static final long serialVersionUID = 2838392045355241008L;
1122	>	}
1123	>
1124	>	/**
1125	>	* Returns a new ForkJoinTask that performs the {@code run}
1126		* method of the given Runnable as its action, and returns a null
1127	<	* result upon <code>join</code>.
1127	>	* result upon {@code join}.
1128		*
1129		* @param runnable the runnable action
1130		* @return the task
1131		*/
1132	<	public static ForkJoinTask<Void> adapt(Runnable runnable) {
1133	<	return new ForkJoinPool.AdaptedRunnable<Void>(runnable, null);
1132	>	public static ForkJoinTask<?> adapt(Runnable runnable) {
1133	>	return new AdaptedRunnable<Void>(runnable, null);
1134		}
1135
1136		/**
1137	<	* Returns a new ForkJoinTask that performs the <code>run</code>
1137	>	* Returns a new ForkJoinTask that performs the {@code run}
1138		* method of the given Runnable as its action, and returns the
1139	<	* given result upon <code>join</code>.
1139	>	* given result upon {@code join}.
1140		*
1141		* @param runnable the runnable action
1142		* @param result the result upon completion
1143		* @return the task
1144		*/
1145		public static <T> ForkJoinTask<T> adapt(Runnable runnable, T result) {
1146	<	return new ForkJoinPool.AdaptedRunnable<T>(runnable, result);
1146	>	return new AdaptedRunnable<T>(runnable, result);
1147		}
1148
1149		/**
1150	<	* Returns a new ForkJoinTask that performs the <code>call</code>
1150	>	* Returns a new ForkJoinTask that performs the {@code call}
1151		* method of the given Callable as its action, and returns its
1152	<	* result upon <code>join</code>, translating any checked
1153	<	* exceptions encountered into <code>RuntimeException<code>.
1152	>	* result upon {@code join}, translating any checked
1153	>	* exceptions encountered into {@code RuntimeException}.
1154		*
1155		* @param callable the callable action
1156		* @return the task
1157		*/
1158	<	public static <T> ForkJoinTask<T> adapt(Callable<T> callable) {
1159	<	return new ForkJoinPool.AdaptedCallable<T>(callable);
1158	>	public static <T> ForkJoinTask<T> adapt(Callable<? extends T> callable) {
1159	>	return new AdaptedCallable<T>(callable);
1160		}
1161
1162		// Serialization support
#	Line 1085 | Line 1167 | public abstract class ForkJoinTask<V> im
1167		* Save the state to a stream.
1168		*
1169		* @serialData the current run status and the exception thrown
1170	<	* during execution, or null if none
1170	>	* during execution, or {@code null} if none
1171		* @param s the stream
1172		*/
1173		private void writeObject(java.io.ObjectOutputStream s)
#	Line 1109 | Line 1191 | public abstract class ForkJoinTask<V> im
1191		setDoneExceptionally((Throwable) ex);
1192		}
1193
1194	<	// Unsafe mechanics for jsr166y 3rd party package.
1194	>	// Unsafe mechanics
1195	>
1196	>	private static final sun.misc.Unsafe UNSAFE = getUnsafe();
1197	>	private static final long statusOffset =
1198	>	objectFieldOffset("status", ForkJoinTask.class);
1199	>
1200	>	private static long objectFieldOffset(String field, Class<?> klazz) {
1201	>	try {
1202	>	return UNSAFE.objectFieldOffset(klazz.getDeclaredField(field));
1203	>	} catch (NoSuchFieldException e) {
1204	>	// Convert Exception to corresponding Error
1205	>	NoSuchFieldError error = new NoSuchFieldError(field);
1206	>	error.initCause(e);
1207	>	throw error;
1208	>	}
1209	>	}
1210	>
1211	>	/**
1212	>	* Returns a sun.misc.Unsafe.  Suitable for use in a 3rd party package.
1213	>	* Replace with a simple call to Unsafe.getUnsafe when integrating
1214	>	* into a jdk.
1215	>	*
1216	>	* @return a sun.misc.Unsafe
1217	>	*/
1218		private static sun.misc.Unsafe getUnsafe() {
1219		try {
1220		return sun.misc.Unsafe.getUnsafe();
1221		} catch (SecurityException se) {
1222		try {
1223		return java.security.AccessController.doPrivileged
1224	<	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
1224	>	(new java.security
1225	>	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
1226		public sun.misc.Unsafe run() throws Exception {
1227	<	return getUnsafeByReflection();
1227	>	java.lang.reflect.Field f = sun.misc
1228	>	.Unsafe.class.getDeclaredField("theUnsafe");
1229	>	f.setAccessible(true);
1230	>	return (sun.misc.Unsafe) f.get(null);
1231		}});
1232		} catch (java.security.PrivilegedActionException e) {
1233		throw new RuntimeException("Could not initialize intrinsics",
#	Line 1126 | Line 1235 | public abstract class ForkJoinTask<V> im
1235		}
1236		}
1237		}
1129	–
1130	–	private static sun.misc.Unsafe getUnsafeByReflection()
1131	–	throws NoSuchFieldException, IllegalAccessException {
1132	–	java.lang.reflect.Field f =
1133	–	sun.misc.Unsafe.class.getDeclaredField("theUnsafe");
1134	–	f.setAccessible(true);
1135	–	return (sun.misc.Unsafe) f.get(null);
1136	–	}
1137	–
1138	–	private static long fieldOffset(String fieldName, Class<?> klazz) {
1139	–	try {
1140	–	return UNSAFE.objectFieldOffset(klazz.getDeclaredField(fieldName));
1141	–	} catch (NoSuchFieldException e) {
1142	–	// Convert Exception to Error
1143	–	NoSuchFieldError error = new NoSuchFieldError(fieldName);
1144	–	error.initCause(e);
1145	–	throw error;
1146	–	}
1147	–	}
1148	–
1149	–	private static final sun.misc.Unsafe UNSAFE = getUnsafe();
1150	–	static final long statusOffset =
1151	–	fieldOffset("status", ForkJoinTask.class);
1152	–
1238		}

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