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Comparing jsr166/src/jsr166y/ForkJoinPool.java (file contents):
Revision 1.21 by jsr166, Fri Jul 24 23:47:01 2009 UTC vs.
Revision 1.34 by jsr166, Fri Jul 31 20:17:52 2009 UTC

#	Line 5 | Line 5
5		*/
6
7		package jsr166y;
8	<	import java.util.*;
8	>
9		import java.util.concurrent.*;
10	<	import java.util.concurrent.locks.*;
11	<	import java.util.concurrent.atomic.*;
10	>
11	>	import java.util.ArrayList;
12	>	import java.util.Arrays;
13	>	import java.util.Collection;
14	>	import java.util.Collections;
15	>	import java.util.List;
16	>	import java.util.concurrent.locks.Condition;
17	>	import java.util.concurrent.locks.LockSupport;
18	>	import java.util.concurrent.locks.ReentrantLock;
19	>	import java.util.concurrent.atomic.AtomicInteger;
20	>	import java.util.concurrent.atomic.AtomicLong;
21
22		/**
23	<	* An {@link ExecutorService} for running {@link ForkJoinTask}s.  A
24	<	* ForkJoinPool provides the entry point for submissions from
23	>	* An {@link ExecutorService} for running {@link ForkJoinTask}s.
24	>	* A ForkJoinPool provides the entry point for submissions from
25		* non-ForkJoinTasks, as well as management and monitoring operations.
26		* Normally a single ForkJoinPool is used for a large number of
27		* submitted tasks. Otherwise, use would not usually outweigh the
#	Line 25 | Line 34 | import java.util.concurrent.atomic.*;
34		* (eventually blocking if none exist). This makes them efficient when
35		* most tasks spawn other subtasks (as do most ForkJoinTasks), as well
36		* as the mixed execution of some plain Runnable- or Callable- based
37	<	* activities along with ForkJoinTasks. When setting
38	<	* {@code setAsyncMode}, a ForkJoinPools may also be appropriate for
39	<	* use with fine-grained tasks that are never joined. Otherwise, other
40	<	* ExecutorService implementations are typically more appropriate
41	<	* choices.
37	>	* activities along with ForkJoinTasks. When setting {@linkplain
38	>	* #setAsyncMode async mode}, a ForkJoinPool may also be appropriate
39	>	* for use with fine-grained tasks that are never joined. Otherwise,
40	>	* other ExecutorService implementations are typically more
41	>	* appropriate choices.
42		*
43		* <p>A ForkJoinPool may be constructed with a given parallelism level
44		* (target pool size), which it attempts to maintain by dynamically
45		* adding, suspending, or resuming threads, even if some tasks are
46		* waiting to join others. However, no such adjustments are performed
47		* in the face of blocked IO or other unmanaged synchronization. The
48	<	* nested {@code ManagedBlocker} interface enables extension of
48	>	* nested {@link ManagedBlocker} interface enables extension of
49		* the kinds of synchronization accommodated.  The target parallelism
50	<	* level may also be changed dynamically ({@code setParallelism})
50	>	* level may also be changed dynamically ({@link #setParallelism})
51		* and thread construction can be limited using methods
52	<	* {@code setMaximumPoolSize} and/or
53	<	* {@code setMaintainsParallelism}.
52	>	* {@link #setMaximumPoolSize} and/or
53	>	* {@link #setMaintainsParallelism}.
54		*
55		* <p>In addition to execution and lifecycle control methods, this
56		* class provides status check methods (for example
57	<	* {@code getStealCount}) that are intended to aid in developing,
57	>	* {@link #getStealCount}) that are intended to aid in developing,
58		* tuning, and monitoring fork/join applications. Also, method
59	<	* {@code toString} returns indications of pool state in a
59	>	* {@link #toString} returns indications of pool state in a
60		* convenient form for informal monitoring.
61		*
62		* <p><b>Implementation notes</b>: This implementation restricts the
#	Line 302 | Line 311 | public class ForkJoinPool extends Abstra
311		}
312
313		/**
314	<	* Returns true if argument represents zero active count and
315	<	* nonzero runstate, which is the triggering condition for
314	>	* Returns {@code true} if argument represents zero active count
315	>	* and nonzero runstate, which is the triggering condition for
316		* terminating on shutdown.
317		*/
318		private static boolean canTerminateOnShutdown(int c) {
#	Line 539 | Line 548 | public class ForkJoinPool extends Abstra
548		* Common code for execute, invoke and submit
549		*/
550		private <T> void doSubmit(ForkJoinTask<T> task) {
551	+	if (task == null)
552	+	throw new NullPointerException();
553		if (isShutdown())
554		throw new RejectedExecutionException();
555		if (workers == null)
#	Line 574 | Line 585 | public class ForkJoinPool extends Abstra
585		// AbstractExecutorService methods
586
587		public void execute(Runnable task) {
588	<	doSubmit(new AdaptedRunnable<Void>(task, null));
588	>	ForkJoinTask<?> job;
589	>	if (task instanceof ForkJoinTask<?>) // avoid re-wrap
590	>	job = (ForkJoinTask<?>) task;
591	>	else
592	>	job = ForkJoinTask.adapt(task, null);
593	>	doSubmit(job);
594		}
595
596		public <T> ForkJoinTask<T> submit(Callable<T> task) {
597	<	ForkJoinTask<T> job = new AdaptedCallable<T>(task);
597	>	ForkJoinTask<T> job = ForkJoinTask.adapt(task);
598		doSubmit(job);
599		return job;
600		}
601
602		public <T> ForkJoinTask<T> submit(Runnable task, T result) {
603	<	ForkJoinTask<T> job = new AdaptedRunnable<T>(task, result);
603	>	ForkJoinTask<T> job = ForkJoinTask.adapt(task, result);
604		doSubmit(job);
605		return job;
606		}
607
608		public ForkJoinTask<?> submit(Runnable task) {
609	<	ForkJoinTask<Void> job = new AdaptedRunnable<Void>(task, null);
609	>	ForkJoinTask<?> job;
610	>	if (task instanceof ForkJoinTask<?>) // avoid re-wrap
611	>	job = (ForkJoinTask<?>) task;
612	>	else
613	>	job = ForkJoinTask.adapt(task, null);
614		doSubmit(job);
615		return job;
616		}
617
618		/**
619	<	* Adaptor for Runnables. This implements RunnableFuture
620	<	* to be compliant with AbstractExecutorService constraints.
619	>	* Submits a ForkJoinTask for execution.
620	>	*
621	>	* @param task the task to submit
622	>	* @return the task
623	>	* @throws RejectedExecutionException if the task cannot be
624	>	*         scheduled for execution
625	>	* @throws NullPointerException if the task is null
626		*/
627	<	static final class AdaptedRunnable<T> extends ForkJoinTask<T>
628	<	implements RunnableFuture<T> {
629	<	final Runnable runnable;
605	<	final T resultOnCompletion;
606	<	T result;
607	<	AdaptedRunnable(Runnable runnable, T result) {
608	<	if (runnable == null) throw new NullPointerException();
609	<	this.runnable = runnable;
610	<	this.resultOnCompletion = result;
611	<	}
612	<	public T getRawResult() { return result; }
613	<	public void setRawResult(T v) { result = v; }
614	<	public boolean exec() {
615	<	runnable.run();
616	<	result = resultOnCompletion;
617	<	return true;
618	<	}
619	<	public void run() { invoke(); }
620	<	private static final long serialVersionUID = 5232453952276885070L;
627	>	public <T> ForkJoinTask<T> submit(ForkJoinTask<T> task) {
628	>	doSubmit(task);
629	>	return task;
630		}
631
623	–	/**
624	–	* Adaptor for Callables
625	–	*/
626	–	static final class AdaptedCallable<T> extends ForkJoinTask<T>
627	–	implements RunnableFuture<T> {
628	–	final Callable<T> callable;
629	–	T result;
630	–	AdaptedCallable(Callable<T> callable) {
631	–	if (callable == null) throw new NullPointerException();
632	–	this.callable = callable;
633	–	}
634	–	public T getRawResult() { return result; }
635	–	public void setRawResult(T v) { result = v; }
636	–	public boolean exec() {
637	–	try {
638	–	result = callable.call();
639	–	return true;
640	–	} catch (Error err) {
641	–	throw err;
642	–	} catch (RuntimeException rex) {
643	–	throw rex;
644	–	} catch (Exception ex) {
645	–	throw new RuntimeException(ex);
646	–	}
647	–	}
648	–	public void run() { invoke(); }
649	–	private static final long serialVersionUID = 2838392045355241008L;
650	–	}
632
633		public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks) {
634		ArrayList<ForkJoinTask<T>> forkJoinTasks =
635		new ArrayList<ForkJoinTask<T>>(tasks.size());
636		for (Callable<T> task : tasks)
637	<	forkJoinTasks.add(new AdaptedCallable<T>(task));
637	>	forkJoinTasks.add(ForkJoinTask.adapt(task));
638		invoke(new InvokeAll<T>(forkJoinTasks));
639
640		@SuppressWarnings({"unchecked", "rawtypes"})
#	Line 686 | Line 667 | public class ForkJoinPool extends Abstra
667		* Returns the handler for internal worker threads that terminate
668		* due to unrecoverable errors encountered while executing tasks.
669		*
670	<	* @return the handler, or null if none
670	>	* @return the handler, or {@code null} if none
671		*/
672		public Thread.UncaughtExceptionHandler getUncaughtExceptionHandler() {
673		Thread.UncaughtExceptionHandler h;
#	Line 707 | Line 688 | public class ForkJoinPool extends Abstra
688		* as handler.
689		*
690		* @param h the new handler
691	<	* @return the old handler, or null if none
691	>	* @return the old handler, or {@code null} if none
692		* @throws SecurityException if a security manager exists and
693		*         the caller is not permitted to modify threads
694		*         because it does not hold {@link
#	Line 781 | Line 762 | public class ForkJoinPool extends Abstra
762		/**
763		* Returns the number of worker threads that have started but not
764		* yet terminated.  This result returned by this method may differ
765	<	* from {@code getParallelism} when threads are created to
765	>	* from {@link #getParallelism} when threads are created to
766		* maintain parallelism when others are cooperatively blocked.
767		*
768		* @return the number of worker threads
#	Line 817 | Line 798 | public class ForkJoinPool extends Abstra
798
799
800		/**
801	<	* Returns true if this pool dynamically maintains its target
802	<	* parallelism level. If false, new threads are added only to
803	<	* avoid possible starvation.
823	<	* This setting is by default true.
801	>	* Returns {@code true} if this pool dynamically maintains its
802	>	* target parallelism level. If false, new threads are added only
803	>	* to avoid possible starvation.  This setting is by default true.
804		*
805	<	* @return true if maintains parallelism
805	>	* @return {@code true} if maintains parallelism
806		*/
807		public boolean getMaintainsParallelism() {
808		return maintainsParallelism;
#	Line 833 | Line 813 | public class ForkJoinPool extends Abstra
813		* parallelism level. If false, new threads are added only to
814		* avoid possible starvation.
815		*
816	<	* @param enable true to maintains parallelism
816	>	* @param enable {@code true} to maintain parallelism
817		*/
818		public void setMaintainsParallelism(boolean enable) {
819		maintainsParallelism = enable;
#	Line 844 | Line 824 | public class ForkJoinPool extends Abstra
824		* tasks that are never joined. This mode may be more appropriate
825		* than default locally stack-based mode in applications in which
826		* worker threads only process asynchronous tasks.  This method is
827	<	* designed to be invoked only when pool is quiescent, and
827	>	* designed to be invoked only when the pool is quiescent, and
828		* typically only before any tasks are submitted. The effects of
829		* invocations at other times may be unpredictable.
830		*
831	<	* @param async if true, use locally FIFO scheduling
831	>	* @param async if {@code true}, use locally FIFO scheduling
832		* @return the previous mode
833	+	* @see #getAsyncMode
834		*/
835		public boolean setAsyncMode(boolean async) {
836		boolean oldMode = locallyFifo;
#	Line 866 | Line 847 | public class ForkJoinPool extends Abstra
847		}
848
849		/**
850	<	* Returns true if this pool uses local first-in-first-out
850	>	* Returns {@code true} if this pool uses local first-in-first-out
851		* scheduling mode for forked tasks that are never joined.
852		*
853	<	* @return true if this pool uses async mode
853	>	* @return {@code true} if this pool uses async mode
854	>	* @see #setAsyncMode
855		*/
856		public boolean getAsyncMode() {
857		return locallyFifo;
#	Line 910 | Line 892 | public class ForkJoinPool extends Abstra
892		}
893
894		/**
895	<	* Returns true if all worker threads are currently idle. An idle
896	<	* worker is one that cannot obtain a task to execute because none
897	<	* are available to steal from other threads, and there are no
898	<	* pending submissions to the pool. This method is conservative;
899	<	* it might not return true immediately upon idleness of all
900	<	* threads, but will eventually become true if threads remain
901	<	* inactive.
895	>	* Returns {@code true} if all worker threads are currently idle.
896	>	* An idle worker is one that cannot obtain a task to execute
897	>	* because none are available to steal from other threads, and
898	>	* there are no pending submissions to the pool. This method is
899	>	* conservative; it might not return {@code true} immediately upon
900	>	* idleness of all threads, but will eventually become true if
901	>	* threads remain inactive.
902		*
903	<	* @return true if all threads are currently idle
903	>	* @return {@code true} if all threads are currently idle
904		*/
905		public boolean isQuiescent() {
906		return activeCountOf(runControl) == 0;
#	Line 984 | Line 966 | public class ForkJoinPool extends Abstra
966		}
967
968		/**
969	<	* Returns true if there are any tasks submitted to this pool
970	<	* that have not yet begun executing.
969	>	* Returns {@code true} if there are any tasks submitted to this
970	>	* pool that have not yet begun executing.
971		*
972		* @return {@code true} if there are any queued submissions
973		*/
#	Line 998 | Line 980 | public class ForkJoinPool extends Abstra
980		* available.  This method may be useful in extensions to this
981		* class that re-assign work in systems with multiple pools.
982		*
983	<	* @return the next submission, or null if none
983	>	* @return the next submission, or {@code null} if none
984		*/
985		protected ForkJoinTask<?> pollSubmission() {
986		return submissionQueue.poll();
#	Line 1021 | Line 1003 | public class ForkJoinPool extends Abstra
1003		* @param c the collection to transfer elements into
1004		* @return the number of elements transferred
1005		*/
1006	<	protected int drainTasksTo(Collection<ForkJoinTask<?>> c) {
1006	>	protected int drainTasksTo(Collection<? super ForkJoinTask<?>> c) {
1007		int n = submissionQueue.drainTo(c);
1008		ForkJoinWorkerThread[] ws = workers;
1009		if (ws != null) {
#	Line 1087 | Line 1069 | public class ForkJoinPool extends Abstra
1069		public void shutdown() {
1070		checkPermission();
1071		transitionRunStateTo(SHUTDOWN);
1072	<	if (canTerminateOnShutdown(runControl))
1072	>	if (canTerminateOnShutdown(runControl)) {
1073	>	if (workers == null) { // shutting down before workers created
1074	>	final ReentrantLock lock = this.workerLock;
1075	>	lock.lock();
1076	>	try {
1077	>	if (workers == null) {
1078	>	terminate();
1079	>	transitionRunStateTo(TERMINATED);
1080	>	termination.signalAll();
1081	>	}
1082	>	} finally {
1083	>	lock.unlock();
1084	>	}
1085	>	}
1086		terminateOnShutdown();
1087	+	}
1088		}
1089
1090		/**
#	Line 1098 | Line 1094 | public class ForkJoinPool extends Abstra
1094		* method may or may not be rejected. Unlike some other executors,
1095		* this method cancels rather than collects non-executed tasks
1096		* upon termination, so always returns an empty list. However, you
1097	<	* can use method {@code drainTasksTo} before invoking this
1097	>	* can use method {@link #drainTasksTo} before invoking this
1098		* method to transfer unexecuted tasks to another collection.
1099		*
1100		* @return an empty list
#	Line 1458 | Line 1454 | public class ForkJoinPool extends Abstra
1454		}
1455
1456		/**
1457	<	* Returns true if worker waiting on sync can proceed:
1457	>	* Returns {@code true} if worker waiting on sync can proceed:
1458		*  - on signal (thread == null)
1459		*  - on event count advance (winning race to notify vs signaller)
1460		*  - on interrupt
#	Line 1466 | Line 1462 | public class ForkJoinPool extends Abstra
1462		* If node was not signalled and event count not advanced on exit,
1463		* then we also help advance event count.
1464		*
1465	<	* @return true if node can be released
1465	>	* @return {@code true} if node can be released
1466		*/
1467		final boolean syncIsReleasable(WaitQueueNode node) {
1468		long prev = node.count;
#	Line 1485 | Line 1481 | public class ForkJoinPool extends Abstra
1481		}
1482
1483		/**
1484	<	* Returns true if a new sync event occurred since last call to
1485	<	* sync or this method, if so, updating caller's count.
1484	>	* Returns {@code true} if a new sync event occurred since last
1485	>	* call to sync or this method, if so, updating caller's count.
1486		*/
1487		final boolean hasNewSyncEvent(ForkJoinWorkerThread w) {
1488		long lc = w.lastEventCount;
#	Line 1570 | Line 1566 | public class ForkJoinPool extends Abstra
1566		}
1567
1568		/**
1569	<	* Returns true if a spare thread appears to be needed.  If
1570	<	* maintaining parallelism, returns true when the deficit in
1569	>	* Returns {@code true} if a spare thread appears to be needed.
1570	>	* If maintaining parallelism, returns true when the deficit in
1571		* running threads is more than the surplus of total threads, and
1572		* there is apparently some work to do.  This self-limiting rule
1573		* means that the more threads that have already been added, the
#	Line 1740 | Line 1736 | public class ForkJoinPool extends Abstra
1736		/**
1737		* Interface for extending managed parallelism for tasks running
1738		* in ForkJoinPools. A ManagedBlocker provides two methods.
1739	<	* Method {@code isReleasable} must return true if blocking is not
1740	<	* necessary. Method {@code block} blocks the current thread if
1741	<	* necessary (perhaps internally invoking {@code isReleasable}
1742	<	* before actually blocking.).
1739	>	* Method {@code isReleasable} must return {@code true} if
1740	>	* blocking is not necessary. Method {@code block} blocks the
1741	>	* current thread if necessary (perhaps internally invoking
1742	>	* {@code isReleasable} before actually blocking.).
1743		*
1744		* <p>For example, here is a ManagedBlocker based on a
1745		* ReentrantLock:
#	Line 1767 | Line 1763 | public class ForkJoinPool extends Abstra
1763		* Possibly blocks the current thread, for example waiting for
1764		* a lock or condition.
1765		*
1766	<	* @return true if no additional blocking is necessary (i.e.,
1767	<	* if isReleasable would return true)
1766	>	* @return {@code true} if no additional blocking is necessary
1767	>	* (i.e., if isReleasable would return true)
1768		* @throws InterruptedException if interrupted while waiting
1769		* (the method is not required to do so, but is allowed to)
1770		*/
1771		boolean block() throws InterruptedException;
1772
1773		/**
1774	<	* Returns true if blocking is unnecessary.
1774	>	* Returns {@code true} if blocking is unnecessary.
1775		*/
1776		boolean isReleasable();
1777		}
#	Line 1785 | Line 1781 | public class ForkJoinPool extends Abstra
1781		* is a ForkJoinWorkerThread, this method possibly arranges for a
1782		* spare thread to be activated if necessary to ensure parallelism
1783		* while the current thread is blocked.  If
1784	<	* {@code maintainParallelism} is true and the pool supports
1784	>	* {@code maintainParallelism} is {@code true} and the pool supports
1785		* it ({@link #getMaintainsParallelism}), this method attempts to
1786		* maintain the pool's nominal parallelism. Otherwise it activates
1787		* a thread only if necessary to avoid complete starvation. This
#	Line 1803 | Line 1799 | public class ForkJoinPool extends Abstra
1799		* be expanded to ensure parallelism, and later adjusted.
1800		*
1801		* @param blocker the blocker
1802	<	* @param maintainParallelism if true and supported by this pool,
1803	<	* attempt to maintain the pool's nominal parallelism; otherwise
1804	<	* activate a thread only if necessary to avoid complete
1805	<	* starvation.
1802	>	* @param maintainParallelism if {@code true} and supported by
1803	>	* this pool, attempt to maintain the pool's nominal parallelism;
1804	>	* otherwise activate a thread only if necessary to avoid
1805	>	* complete starvation.
1806		* @throws InterruptedException if blocker.block did so
1807		*/
1808		public static void managedBlock(ManagedBlocker blocker,
#	Line 1832 | Line 1828 | public class ForkJoinPool extends Abstra
1828		do {} while (!blocker.isReleasable() && !blocker.block());
1829		}
1830
1831	<	// AbstractExecutorService overrides
1831	>	// AbstractExecutorService overrides.  These rely on undocumented
1832	>	// fact that ForkJoinTask.adapt returns ForkJoinTasks that also
1833	>	// implement RunnableFuture.
1834
1835		protected <T> RunnableFuture<T> newTaskFor(Runnable runnable, T value) {
1836	<	return new AdaptedRunnable<T>(runnable, value);
1836	>	return (RunnableFuture<T>) ForkJoinTask.adapt(runnable, value);
1837		}
1838
1839		protected <T> RunnableFuture<T> newTaskFor(Callable<T> callable) {
1840	<	return new AdaptedCallable<T>(callable);
1840	>	return (RunnableFuture<T>) ForkJoinTask.adapt(callable);
1841		}
1842
1843	<
1846	<	// Unsafe mechanics for jsr166y 3rd party package.
1847	<	private static sun.misc.Unsafe getUnsafe() {
1848	<	try {
1849	<	return sun.misc.Unsafe.getUnsafe();
1850	<	} catch (SecurityException se) {
1851	<	try {
1852	<	return java.security.AccessController.doPrivileged
1853	<	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
1854	<	public sun.misc.Unsafe run() throws Exception {
1855	<	return getUnsafeByReflection();
1856	<	}});
1857	<	} catch (java.security.PrivilegedActionException e) {
1858	<	throw new RuntimeException("Could not initialize intrinsics",
1859	<	e.getCause());
1860	<	}
1861	<	}
1862	<	}
1863	<
1864	<	private static sun.misc.Unsafe getUnsafeByReflection()
1865	<	throws NoSuchFieldException, IllegalAccessException {
1866	<	java.lang.reflect.Field f =
1867	<	sun.misc.Unsafe.class.getDeclaredField("theUnsafe");
1868	<	f.setAccessible(true);
1869	<	return (sun.misc.Unsafe) f.get(null);
1870	<	}
1871	<
1872	<	private static long fieldOffset(String fieldName, Class<?> klazz) {
1873	<	try {
1874	<	return UNSAFE.objectFieldOffset(klazz.getDeclaredField(fieldName));
1875	<	} catch (NoSuchFieldException e) {
1876	<	// Convert Exception to Error
1877	<	NoSuchFieldError error = new NoSuchFieldError(fieldName);
1878	<	error.initCause(e);
1879	<	throw error;
1880	<	}
1881	<	}
1843	>	// Unsafe mechanics
1844
1845		private static final sun.misc.Unsafe UNSAFE = getUnsafe();
1846	<	static final long eventCountOffset =
1847	<	fieldOffset("eventCount", ForkJoinPool.class);
1848	<	static final long workerCountsOffset =
1849	<	fieldOffset("workerCounts", ForkJoinPool.class);
1850	<	static final long runControlOffset =
1851	<	fieldOffset("runControl", ForkJoinPool.class);
1852	<	static final long syncStackOffset =
1853	<	fieldOffset("syncStack",ForkJoinPool.class);
1854	<	static final long spareStackOffset =
1855	<	fieldOffset("spareStack", ForkJoinPool.class);
1846	>	private static final long eventCountOffset =
1847	>	objectFieldOffset("eventCount", ForkJoinPool.class);
1848	>	private static final long workerCountsOffset =
1849	>	objectFieldOffset("workerCounts", ForkJoinPool.class);
1850	>	private static final long runControlOffset =
1851	>	objectFieldOffset("runControl", ForkJoinPool.class);
1852	>	private static final long syncStackOffset =
1853	>	objectFieldOffset("syncStack",ForkJoinPool.class);
1854	>	private static final long spareStackOffset =
1855	>	objectFieldOffset("spareStack", ForkJoinPool.class);
1856
1857		private boolean casEventCount(long cmp, long val) {
1858		return UNSAFE.compareAndSwapLong(this, eventCountOffset, cmp, val);
#	Line 1907 | Line 1869 | public class ForkJoinPool extends Abstra
1869		private boolean casBarrierStack(WaitQueueNode cmp, WaitQueueNode val) {
1870		return UNSAFE.compareAndSwapObject(this, syncStackOffset, cmp, val);
1871		}
1872	+
1873	+	private static long objectFieldOffset(String field, Class<?> klazz) {
1874	+	try {
1875	+	return UNSAFE.objectFieldOffset(klazz.getDeclaredField(field));
1876	+	} catch (NoSuchFieldException e) {
1877	+	// Convert Exception to corresponding Error
1878	+	NoSuchFieldError error = new NoSuchFieldError(field);
1879	+	error.initCause(e);
1880	+	throw error;
1881	+	}
1882	+	}
1883	+
1884	+	/**
1885	+	* Returns a sun.misc.Unsafe.  Suitable for use in a 3rd party package.
1886	+	* Replace with a simple call to Unsafe.getUnsafe when integrating
1887	+	* into a jdk.
1888	+	*
1889	+	* @return a sun.misc.Unsafe
1890	+	*/
1891	+	private static sun.misc.Unsafe getUnsafe() {
1892	+	try {
1893	+	return sun.misc.Unsafe.getUnsafe();
1894	+	} catch (SecurityException se) {
1895	+	try {
1896	+	return java.security.AccessController.doPrivileged
1897	+	(new java.security
1898	+	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
1899	+	public sun.misc.Unsafe run() throws Exception {
1900	+	java.lang.reflect.Field f = sun.misc
1901	+	.Unsafe.class.getDeclaredField("theUnsafe");
1902	+	f.setAccessible(true);
1903	+	return (sun.misc.Unsafe) f.get(null);
1904	+	}});
1905	+	} catch (java.security.PrivilegedActionException e) {
1906	+	throw new RuntimeException("Could not initialize intrinsics",
1907	+	e.getCause());
1908	+	}
1909	+	}
1910	+	}
1911		}

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