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

Comparing jsr166/src/jsr166y/ForkJoinTask.java (file contents):
Revision 1.10 by jsr166, Tue Jul 21 00:15:13 2009 UTC vs.
Revision 1.18 by dl, Sat Jul 25 15:50:57 2009 UTC

#	Line 5 | Line 5
5		*/
6
7		package jsr166y;
8	<	import java.io.Serializable;
9	<	import java.util.*;
8	>
9		import java.util.concurrent.*;
10	<	import java.util.concurrent.atomic.*;
11	<	import sun.misc.Unsafe;
12	<	import java.lang.reflect.*;
10	>
11	>	import java.io.Serializable;
12	>	import java.util.Collection;
13	>	import java.util.Collections;
14	>	import java.util.List;
15	>	import java.util.Map;
16	>	import java.util.WeakHashMap;
17
18		/**
19		* Abstract base class for tasks that run within a {@link
#	Line 81 | Line 84 | import java.lang.reflect.*;
84		* class. While these methods have {@code public} access (to allow
85		* instances of different task subclasses to call each others
86		* methods), some of them may only be called from within other
87	<	* ForkJoinTasks. Attempts to invoke them in other contexts result in
88	<	* exceptions or errors possibly including ClassCastException.
87	>	* ForkJoinTasks (as may be determined using method {@link
88	>	* #inForkJoinPool}).  Attempts to invoke them in other contexts
89	>	* result in exceptions or errors, possibly including
90	>	* ClassCastException.
91		*
92		* <p>Most base support methods are {@code final} because their
93		* implementations are intrinsically tied to the underlying
#	Line 107 | Line 112 | import java.lang.reflect.*;
112		* in general sensible to serialize tasks only before or after, but
113		* not during execution. Serialization is not relied on during
114		* execution itself.
115	+	*
116	+	* @since 1.7
117	+	* @author Doug Lea
118		*/
119		public abstract class ForkJoinTask<V> implements Future<V>, Serializable {
120
#	Line 157 | Line 165 | public abstract class ForkJoinTask<V> im
165		*/
166		static ForkJoinWorkerThread getWorker() {
167		Thread t = Thread.currentThread();
168	<	return ((t instanceof ForkJoinWorkerThread)?
169	<	(ForkJoinWorkerThread)t : null);
168	>	return ((t instanceof ForkJoinWorkerThread) ?
169	>	(ForkJoinWorkerThread) t : null);
170		}
171
172		final boolean casStatus(int cmp, int val) {
173	<	return _unsafe.compareAndSwapInt(this, statusOffset, cmp, val);
173	>	return UNSAFE.compareAndSwapInt(this, statusOffset, cmp, val);
174		}
175
176		/**
#	Line 170 | Line 178 | public abstract class ForkJoinTask<V> im
178		*/
179		static void rethrowException(Throwable ex) {
180		if (ex != null)
181	<	_unsafe.throwException(ex);
181	>	UNSAFE.throwException(ex);
182		}
183
184		// Setting completion status
#	Line 184 | Line 192 | public abstract class ForkJoinTask<V> im
192		ForkJoinPool pool = getPool();
193		if (pool != null) {
194		int s; // Clear signal bits while setting completion status
195	<	do;while ((s = status) >= 0 && !casStatus(s, completion));
195	>	do {} while ((s = status) >= 0 && !casStatus(s, completion));
196
197		if ((s & SIGNAL_MASK) != 0) {
198		if ((s &= INTERNAL_SIGNAL_MASK) != 0)
199		pool.updateRunningCount(s);
200	<	synchronized(this) { notifyAll(); }
200	>	synchronized (this) { notifyAll(); }
201		}
202		}
203		else
#	Line 202 | Line 210 | public abstract class ForkJoinTask<V> im
210		*/
211		private void externallySetCompletion(int completion) {
212		int s;
213	<	do;while ((s = status) >= 0 &&
214	<	!casStatus(s, (s & SIGNAL_MASK) | completion));
215	<	synchronized(this) { notifyAll(); }
213	>	do {} while ((s = status) >= 0 &&
214	>	!casStatus(s, (s & SIGNAL_MASK) | completion));
215	>	synchronized (this) { notifyAll(); }
216		}
217
218		/**
219	<	* Sets status to indicate normal completion
219	>	* Sets status to indicate normal completion.
220		*/
221		final void setNormalCompletion() {
222		// Try typical fast case -- single CAS, no signal, not already done.
223		// Manually expand casStatus to improve chances of inlining it
224	<	if (!_unsafe.compareAndSwapInt(this, statusOffset, 0, NORMAL))
224	>	if (!UNSAFE.compareAndSwapInt(this, statusOffset, 0, NORMAL))
225		setCompletion(NORMAL);
226		}
227
228		// internal waiting and notification
229
230		/**
231	<	* Performs the actual monitor wait for awaitDone
231	>	* Performs the actual monitor wait for awaitDone.
232		*/
233		private void doAwaitDone() {
234		// Minimize lock bias and in/de-flation effects by maximizing
235		// chances of waiting inside sync
236		try {
237		while (status >= 0)
238	<	synchronized(this) { if (status >= 0) wait(); }
238	>	synchronized (this) { if (status >= 0) wait(); }
239		} catch (InterruptedException ie) {
240		onInterruptedWait();
241		}
242		}
243
244		/**
245	<	* Performs the actual monitor wait for awaitDone
245	>	* Performs the actual timed monitor wait for awaitDone.
246		*/
247		private void doAwaitDone(long startTime, long nanos) {
248	<	synchronized(this) {
248	>	synchronized (this) {
249		try {
250		while (status >= 0) {
251		long nt = nanos - System.nanoTime() - startTime;
252		if (nt <= 0)
253		break;
254	<	wait(nt / 1000000, (int)(nt % 1000000));
254	>	wait(nt / 1000000, (int) (nt % 1000000));
255		}
256		} catch (InterruptedException ie) {
257		onInterruptedWait();
#	Line 259 | Line 267 | public abstract class ForkJoinTask<V> im
267		*
268		* @return status upon exit
269		*/
270	<	private int awaitDone(ForkJoinWorkerThread w, boolean maintainParallelism) {
271	<	ForkJoinPool pool = w == null? null : w.pool;
270	>	private int awaitDone(ForkJoinWorkerThread w,
271	>	boolean maintainParallelism) {
272	>	ForkJoinPool pool = (w == null) ? null : w.pool;
273		int s;
274		while ((s = status) >= 0) {
275	<	if (casStatus(s, pool == null? s|EXTERNAL_SIGNAL : s+1)) {
275	>	if (casStatus(s, (pool == null) ? s|EXTERNAL_SIGNAL : s+1)) {
276		if (pool == null || !pool.preJoin(this, maintainParallelism))
277		doAwaitDone();
278		if (((s = status) & INTERNAL_SIGNAL_MASK) != 0)
#	Line 276 | Line 285 | public abstract class ForkJoinTask<V> im
285
286		/**
287		* Timed version of awaitDone
288	+	*
289		* @return status upon exit
290		*/
291		private int awaitDone(ForkJoinWorkerThread w, long nanos) {
292	<	ForkJoinPool pool = w == null? null : w.pool;
292	>	ForkJoinPool pool = (w == null) ? null : w.pool;
293		int s;
294		while ((s = status) >= 0) {
295	<	if (casStatus(s, pool == null? s|EXTERNAL_SIGNAL : s+1)) {
295	>	if (casStatus(s, (pool == null) ? s|EXTERNAL_SIGNAL : s+1)) {
296		long startTime = System.nanoTime();
297		if (pool == null || !pool.preJoin(this, false))
298		doAwaitDone(startTime, nanos);
#	Line 304 | Line 314 | public abstract class ForkJoinTask<V> im
314		*/
315		private void adjustPoolCountsOnUnblock(ForkJoinPool pool) {
316		int s;
317	<	do;while ((s = status) < 0 && !casStatus(s, s & COMPLETION_MASK));
317	>	do {} while ((s = status) < 0 && !casStatus(s, s & COMPLETION_MASK));
318		if (pool != null && (s &= INTERNAL_SIGNAL_MASK) != 0)
319		pool.updateRunningCount(s);
320		}
#	Line 359 | Line 369 | public abstract class ForkJoinTask<V> im
369
370		/**
371		* Returns result or throws exception using j.u.c.Future conventions.
372	<	* Only call when isDone known to be true.
372	>	* Only call when {@code isDone} known to be true.
373		*/
374		private V reportFutureResult()
375		throws ExecutionException, InterruptedException {
#	Line 425 | Line 435 | public abstract class ForkJoinTask<V> im
435		try {
436		if (!exec())
437		return;
438	<	} catch(Throwable rex) {
438	>	} catch (Throwable rex) {
439		setDoneExceptionally(rex);
440		return;
441		}
#	Line 457 | Line 467 | public abstract class ForkJoinTask<V> im
467		final void cancelIgnoringExceptions() {
468		try {
469		cancel(false);
470	<	} catch(Throwable ignore) {
470	>	} catch (Throwable ignore) {
471		}
472		}
473
#	Line 469 | Line 479 | public abstract class ForkJoinTask<V> im
479		ForkJoinTask<?> t;
480		while ((s = status) >= 0 && (t = w.scanWhileJoining(this)) != null)
481		t.quietlyExec();
482	<	return (s >= 0)? awaitDone(w, false) : s; // block if no work
482	>	return (s >= 0) ? awaitDone(w, false) : s; // block if no work
483		}
484
485		// public methods
#	Line 479 | Line 489 | public abstract class ForkJoinTask<V> im
489		* necessarily enforced, it is a usage error to fork a task more
490		* than once unless it has completed and been reinitialized.  This
491		* method may be invoked only from within ForkJoinTask
492	<	* computations. Attempts to invoke in other contexts result in
493	<	* exceptions or errors possibly including ClassCastException.
494	<	*/
495	<	public final void fork() {
496	<	((ForkJoinWorkerThread)(Thread.currentThread())).pushTask(this);
492	>	* computations (as may be determined using method {@link
493	>	* #inForkJoinPool}). Attempts to invoke in other contexts result
494	>	* in exceptions or errors, possibly including ClassCastException.
495	>	*
496	>	* @return <code>this</code>, to simplify usage.
497	>	*/
498	>	public final ForkJoinTask<V> fork() {
499	>	((ForkJoinWorkerThread) Thread.currentThread())
500	>	.pushTask(this);
501	>	return this;
502		}
503
504		/**
#	Line 519 | Line 534 | public abstract class ForkJoinTask<V> im
534		/**
535		* Forks both tasks, returning when {@code isDone} holds for
536		* both of them or an exception is encountered. This method may be
537	<	* invoked only from within ForkJoinTask computations. Attempts to
538	<	* invoke in other contexts result in exceptions or errors
537	>	* invoked only from within ForkJoinTask computations (as may be
538	>	* determined using method {@link #inForkJoinPool}). Attempts to
539	>	* invoke in other contexts result in exceptions or errors,
540		* possibly including ClassCastException.
541		*
542		* @param t1 one task
#	Line 538 | Line 554 | public abstract class ForkJoinTask<V> im
554		* Forks the given tasks, returning when {@code isDone} holds
555		* for all of them. If any task encounters an exception, others
556		* may be cancelled.  This method may be invoked only from within
557	<	* ForkJoinTask computations. Attempts to invoke in other contexts
558	<	* result in exceptions or errors possibly including ClassCastException.
557	>	* ForkJoinTask computations (as may be determined using method
558	>	* {@link #inForkJoinPool}). Attempts to invoke in other contexts
559	>	* result in exceptions or errors, possibly including
560	>	* ClassCastException.
561		*
562		* @param tasks the array of tasks
563		* @throws NullPointerException if tasks or any element are null
#	Line 582 | Line 600 | public abstract class ForkJoinTask<V> im
600		* Forks all tasks in the collection, returning when
601		* {@code isDone} holds for all of them. If any task
602		* encounters an exception, others may be cancelled.  This method
603	<	* may be invoked only from within ForkJoinTask
604	<	* computations. Attempts to invoke in other contexts result in
605	<	* exceptions or errors possibly including ClassCastException.
603	>	* may be invoked only from within ForkJoinTask computations (as
604	>	* may be determined using method {@link
605	>	* #inForkJoinPool}). Attempts to invoke in other contexts result
606	>	* in exceptions or errors, possibly including ClassCastException.
607		*
608		* @param tasks the collection of tasks
609		* @throws NullPointerException if tasks or any element are null
610		* @throws RuntimeException or Error if any task did so
611		*/
612		public static void invokeAll(Collection<? extends ForkJoinTask<?>> tasks) {
613	<	if (!(tasks instanceof List)) {
614	<	invokeAll(tasks.toArray(new ForkJoinTask[tasks.size()]));
613	>	if (!(tasks instanceof List<?>)) {
614	>	invokeAll(tasks.toArray(new ForkJoinTask<?>[tasks.size()]));
615		return;
616		}
617	+	@SuppressWarnings("unchecked")
618		List<? extends ForkJoinTask<?>> ts =
619	<	(List<? extends ForkJoinTask<?>>)tasks;
619	>	(List<? extends ForkJoinTask<?>>) tasks;
620		Throwable ex = null;
621		int last = ts.size() - 1;
622		for (int i = last; i >= 0; --i) {
#	Line 671 | Line 691 | public abstract class ForkJoinTask<V> im
691		*
692		* @param mayInterruptIfRunning this value is ignored in the
693		* default implementation because tasks are not in general
694	<	* cancelled via interruption.
694	>	* cancelled via interruption
695		*
696		* @return true if this task is now cancelled
697		*/
#	Line 721 | Line 741 | public abstract class ForkJoinTask<V> im
741		*/
742		public void completeExceptionally(Throwable ex) {
743		setDoneExceptionally((ex instanceof RuntimeException) ||
744	<	(ex instanceof Error)? ex :
744	>	(ex instanceof Error) ? ex :
745		new RuntimeException(ex));
746		}
747
#	Line 740 | Line 760 | public abstract class ForkJoinTask<V> im
760		public void complete(V value) {
761		try {
762		setRawResult(value);
763	<	} catch(Throwable rex) {
763	>	} catch (Throwable rex) {
764		setDoneExceptionally(rex);
765		return;
766		}
#	Line 770 | Line 790 | public abstract class ForkJoinTask<V> im
790		* current task and that of any other task that might be executed
791		* while helping. (This usually holds for pure divide-and-conquer
792		* tasks). This method may be invoked only from within
793	<	* ForkJoinTask computations. Attempts to invoke in other contexts
794	<	* result in exceptions or errors possibly including ClassCastException.
793	>	* ForkJoinTask computations (as may be determined using method
794	>	* {@link #inForkJoinPool}). Attempts to invoke in other contexts
795	>	* result in exceptions or errors, possibly including
796	>	* ClassCastException.
797		*
798		* @return the computed result
799		*/
800		public final V helpJoin() {
801	<	ForkJoinWorkerThread w = (ForkJoinWorkerThread)(Thread.currentThread());
801	>	ForkJoinWorkerThread w = (ForkJoinWorkerThread) Thread.currentThread();
802		if (status < 0 || !w.unpushTask(this) || !tryExec())
803		reportException(busyJoin(w));
804		return getRawResult();
#	Line 785 | Line 807 | public abstract class ForkJoinTask<V> im
807		/**
808		* Possibly executes other tasks until this task is ready.  This
809		* method may be invoked only from within ForkJoinTask
810	<	* computations. Attempts to invoke in other contexts result in
811	<	* exceptions or errors possibly including ClassCastException.
810	>	* computations (as may be determined using method {@link
811	>	* #inForkJoinPool}). Attempts to invoke in other contexts result
812	>	* in exceptions or errors, possibly including ClassCastException.
813		*/
814		public final void quietlyHelpJoin() {
815		if (status >= 0) {
816		ForkJoinWorkerThread w =
817	<	(ForkJoinWorkerThread)(Thread.currentThread());
817	>	(ForkJoinWorkerThread) Thread.currentThread();
818		if (!w.unpushTask(this) || !tryQuietlyInvoke())
819		busyJoin(w);
820		}
#	Line 830 | Line 853 | public abstract class ForkJoinTask<V> im
853		* joined, instead executing them until all are processed.
854		*/
855		public static void helpQuiesce() {
856	<	((ForkJoinWorkerThread)(Thread.currentThread())).
857	<	helpQuiescePool();
856	>	((ForkJoinWorkerThread) Thread.currentThread())
857	>	.helpQuiescePool();
858		}
859
860		/**
#	Line 852 | Line 875 | public abstract class ForkJoinTask<V> im
875
876		/**
877		* Returns the pool hosting the current task execution, or null
878	<	* if this task is executing outside of any pool.
878	>	* if this task is executing outside of any ForkJoinPool.
879		*
880		* @return the pool, or null if none
881		*/
882		public static ForkJoinPool getPool() {
883		Thread t = Thread.currentThread();
884	<	return ((t instanceof ForkJoinWorkerThread)?
885	<	((ForkJoinWorkerThread)t).pool : null);
884	>	return (t instanceof ForkJoinWorkerThread) ?
885	>	((ForkJoinWorkerThread) t).pool : null;
886	>	}
887	>
888	>	/**
889	>	* Returns {@code true} if the current thread is executing as a
890	>	* ForkJoinPool computation.
891	>	*
892	>	* @return {@code true} if the current thread is executing as a
893	>	* ForkJoinPool computation, or false otherwise
894	>	*/
895	>	public static boolean inForkJoinPool() {
896	>	return Thread.currentThread() instanceof ForkJoinWorkerThread;
897		}
898
899		/**
#	Line 869 | Line 903 | public abstract class ForkJoinTask<V> im
903		* another thread.  This method may be useful when arranging
904		* alternative local processing of tasks that could have been, but
905		* were not, stolen. This method may be invoked only from within
906	<	* ForkJoinTask computations. Attempts to invoke in other contexts
907	<	* result in exceptions or errors possibly including ClassCastException.
906	>	* ForkJoinTask computations (as may be determined using method
907	>	* {@link #inForkJoinPool}). Attempts to invoke in other contexts
908	>	* result in exceptions or errors, possibly including
909	>	* ClassCastException.
910		*
911		* @return true if unforked
912		*/
913		public boolean tryUnfork() {
914	<	return ((ForkJoinWorkerThread)(Thread.currentThread())).unpushTask(this);
914	>	return ((ForkJoinWorkerThread) Thread.currentThread())
915	>	.unpushTask(this);
916		}
917
918		/**
#	Line 887 | Line 924 | public abstract class ForkJoinTask<V> im
924		* @return the number of tasks
925		*/
926		public static int getQueuedTaskCount() {
927	<	return ((ForkJoinWorkerThread)(Thread.currentThread())).
928	<	getQueueSize();
927	>	return ((ForkJoinWorkerThread) Thread.currentThread())
928	>	.getQueueSize();
929		}
930
931		/**
#	Line 904 | Line 941 | public abstract class ForkJoinTask<V> im
941		* @return the surplus number of tasks, which may be negative
942		*/
943		public static int getSurplusQueuedTaskCount() {
944	<	return ((ForkJoinWorkerThread)(Thread.currentThread()))
944	>	return ((ForkJoinWorkerThread) Thread.currentThread())
945		.getEstimatedSurplusTaskCount();
946		}
947
#	Line 951 | Line 988 | public abstract class ForkJoinTask<V> im
988		* be polled or executed next.  This method is designed primarily
989		* to support extensions, and is unlikely to be useful otherwise.
990		* This method may be invoked only from within ForkJoinTask
991	<	* computations. Attempts to invoke in other contexts result in
992	<	* exceptions or errors possibly including ClassCastException.
991	>	* computations (as may be determined using method {@link
992	>	* #inForkJoinPool}). Attempts to invoke in other contexts result
993	>	* in exceptions or errors, possibly including ClassCastException.
994		*
995		* @return the next task, or null if none are available
996		*/
997		protected static ForkJoinTask<?> peekNextLocalTask() {
998	<	return ((ForkJoinWorkerThread)(Thread.currentThread())).peekTask();
998	>	return ((ForkJoinWorkerThread) Thread.currentThread())
999	>	.peekTask();
1000		}
1001
1002		/**
#	Line 965 | Line 1004 | public abstract class ForkJoinTask<V> im
1004		* queued by the current thread but not yet executed.  This method
1005		* is designed primarily to support extensions, and is unlikely to
1006		* be useful otherwise.  This method may be invoked only from
1007	<	* within ForkJoinTask computations. Attempts to invoke in other
1008	<	* contexts result in exceptions or errors possibly including
1007	>	* within ForkJoinTask computations (as may be determined using
1008	>	* method {@link #inForkJoinPool}). Attempts to invoke in other
1009	>	* contexts result in exceptions or errors, possibly including
1010		* ClassCastException.
1011		*
1012		* @return the next task, or null if none are available
1013		*/
1014		protected static ForkJoinTask<?> pollNextLocalTask() {
1015	<	return ((ForkJoinWorkerThread)(Thread.currentThread())).pollLocalTask();
1015	>	return ((ForkJoinWorkerThread) Thread.currentThread())
1016	>	.pollLocalTask();
1017		}
1018
1019		/**
#	Line 984 | Line 1025 | public abstract class ForkJoinTask<V> im
1025		* of the pool this task is operating in.  This method is designed
1026		* primarily to support extensions, and is unlikely to be useful
1027		* otherwise.  This method may be invoked only from within
1028	<	* ForkJoinTask computations. Attempts to invoke in other contexts
1029	<	* result in exceptions or errors possibly including
1028	>	* ForkJoinTask computations (as may be determined using method
1029	>	* {@link #inForkJoinPool}). Attempts to invoke in other contexts
1030	>	* result in exceptions or errors, possibly including
1031		* ClassCastException.
1032		*
1033		* @return a task, or null if none are available
1034		*/
1035		protected static ForkJoinTask<?> pollTask() {
1036	<	return ((ForkJoinWorkerThread)(Thread.currentThread())).
1037	<	pollTask();
1036	>	return ((ForkJoinWorkerThread) Thread.currentThread())
1037	>	.pollTask();
1038	>	}
1039	>
1040	>	// adaptors
1041	>
1042	>	/**
1043	>	* Returns a new ForkJoinTask that performs the <code>run</code>
1044	>	* method of the given Runnable as its action, and returns a null
1045	>	* result upon <code>join</code>.
1046	>	*
1047	>	* @param runnable the runnable action
1048	>	* @return the task
1049	>	*/
1050	>	public static ForkJoinTask<Void> adapt(Runnable runnable) {
1051	>	return new ForkJoinPool.AdaptedRunnable<Void>(runnable, null);
1052	>	}
1053	>
1054	>	/**
1055	>	* Returns a new ForkJoinTask that performs the <code>run</code>
1056	>	* method of the given Runnable as its action, and returns the
1057	>	* given result upon <code>join</code>.
1058	>	*
1059	>	* @param runnable the runnable action
1060	>	* @param result the result upon completion
1061	>	* @return the task
1062	>	*/
1063	>	public static <T> ForkJoinTask<T> adapt(Runnable runnable, T result) {
1064	>	return new ForkJoinPool.AdaptedRunnable<T>(runnable, result);
1065	>	}
1066	>
1067	>	/**
1068	>	* Returns a new ForkJoinTask that performs the <code>call</code>
1069	>	* method of the given Callable as its action, and returns its
1070	>	* result upon <code>join</code>, translating any checked
1071	>	* exceptions encountered into <code>RuntimeException<code>.
1072	>	*
1073	>	* @param callable the callable action
1074	>	* @return the task
1075	>	*/
1076	>	public static <T> ForkJoinTask<T> adapt(Callable<T> callable) {
1077	>	return new ForkJoinPool.AdaptedCallable<T>(callable);
1078		}
1079
1080		// Serialization support
#	Line 1024 | Line 1106 | public abstract class ForkJoinTask<V> im
1106		status |= EXTERNAL_SIGNAL; // conservatively set external signal
1107		Object ex = s.readObject();
1108		if (ex != null)
1109	<	setDoneExceptionally((Throwable)ex);
1109	>	setDoneExceptionally((Throwable) ex);
1110		}
1111
1112	<	// Temporary Unsafe mechanics for preliminary release
1113	<	private static Unsafe getUnsafe() throws Throwable {
1112	>	// Unsafe mechanics for jsr166y 3rd party package.
1113	>	private static sun.misc.Unsafe getUnsafe() {
1114		try {
1115	<	return Unsafe.getUnsafe();
1115	>	return sun.misc.Unsafe.getUnsafe();
1116		} catch (SecurityException se) {
1117		try {
1118		return java.security.AccessController.doPrivileged
1119	<	(new java.security.PrivilegedExceptionAction<Unsafe>() {
1120	<	public Unsafe run() throws Exception {
1121	<	return getUnsafePrivileged();
1119	>	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
1120	>	public sun.misc.Unsafe run() throws Exception {
1121	>	return getUnsafeByReflection();
1122		}});
1123		} catch (java.security.PrivilegedActionException e) {
1124	<	throw e.getCause();
1124	>	throw new RuntimeException("Could not initialize intrinsics",
1125	>	e.getCause());
1126		}
1127		}
1128		}
1129
1130	<	private static Unsafe getUnsafePrivileged()
1130	>	private static sun.misc.Unsafe getUnsafeByReflection()
1131		throws NoSuchFieldException, IllegalAccessException {
1132	<	Field f = Unsafe.class.getDeclaredField("theUnsafe");
1132	>	java.lang.reflect.Field f =
1133	>	sun.misc.Unsafe.class.getDeclaredField("theUnsafe");
1134		f.setAccessible(true);
1135	<	return (Unsafe) f.get(null);
1135	>	return (sun.misc.Unsafe) f.get(null);
1136		}
1137
1138	<	private static long fieldOffset(String fieldName)
1055	<	throws NoSuchFieldException {
1056	<	return _unsafe.objectFieldOffset
1057	<	(ForkJoinTask.class.getDeclaredField(fieldName));
1058	<	}
1059	<
1060	<	static final Unsafe _unsafe;
1061	<	static final long statusOffset;
1062	<
1063	<	static {
1138	>	private static long fieldOffset(String fieldName, Class<?> klazz) {
1139		try {
1140	<	_unsafe = getUnsafe();
1141	<	statusOffset = fieldOffset("status");
1142	<	} catch (Throwable e) {
1143	<	throw new RuntimeException("Could not initialize intrinsics", e);
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	+
1153		}

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