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root/jsr166/jsr166/src/jsr166y/ForkJoinPool.java

Comparing jsr166/src/jsr166y/ForkJoinPool.java (file contents):
Revision 1.24 by dl, Sat Jul 25 17:49:01 2009 UTC vs.
Revision 1.35 by jsr166, Sat Aug 1 21:17:11 2009 UTC

#	Line 20 | Line 20 | import java.util.concurrent.atomic.Atomi
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 34 | Line 34 | import java.util.concurrent.atomic.Atomi
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 81 | Line 81 | public class ForkJoinPool extends Abstra
81		private static final int MAX_THREADS =  0x7FFF;
82
83		/**
84	<	* Factory for creating new ForkJoinWorkerThreads.  A
85	<	* ForkJoinWorkerThreadFactory must be defined and used for
86	<	* ForkJoinWorkerThread subclasses that extend base functionality
87	<	* or initialize threads with different contexts.
84	>	* Factory for creating new {@link ForkJoinWorkerThread}s.
85	>	* A {@code ForkJoinWorkerThreadFactory} must be defined and used
86	>	* for {@code ForkJoinWorkerThread} subclasses that extend base
87	>	* functionality or initialize threads with different contexts.
88		*/
89		public static interface ForkJoinWorkerThreadFactory {
90		/**
#	Line 311 | 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 586 | Line 586 | public class ForkJoinPool extends Abstra
586
587		public void execute(Runnable task) {
588		ForkJoinTask<?> job;
589	<	if (task instanceof ForkJoinTask) // avoid re-wrap
590	<	job = (ForkJoinTask<?>)task;
589	>	if (task instanceof ForkJoinTask<?>) // avoid re-wrap
590	>	job = (ForkJoinTask<?>) task;
591		else
592	<	job = new AdaptedRunnable<Void>(task, null);
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<?> job;
610	<	if (task instanceof ForkJoinTask) // avoid re-wrap
611	<	job = (ForkJoinTask<?>)task;
610	>	if (task instanceof ForkJoinTask<?>) // avoid re-wrap
611	>	job = (ForkJoinTask<?>) task;
612		else
613	<	job = new AdaptedRunnable<Void>(task, null);
613	>	job = ForkJoinTask.adapt(task, null);
614		doSubmit(job);
615		return job;
616		}
#	Line 629 | Line 629 | public class ForkJoinPool extends Abstra
629		return task;
630		}
631
632	–	/**
633	–	* Adaptor for Runnables. This implements RunnableFuture
634	–	* to be compliant with AbstractExecutorService constraints.
635	–	*/
636	–	static final class AdaptedRunnable<T> extends ForkJoinTask<T>
637	–	implements RunnableFuture<T> {
638	–	final Runnable runnable;
639	–	final T resultOnCompletion;
640	–	T result;
641	–	AdaptedRunnable(Runnable runnable, T result) {
642	–	if (runnable == null) throw new NullPointerException();
643	–	this.runnable = runnable;
644	–	this.resultOnCompletion = result;
645	–	}
646	–	public T getRawResult() { return result; }
647	–	public void setRawResult(T v) { result = v; }
648	–	public boolean exec() {
649	–	runnable.run();
650	–	result = resultOnCompletion;
651	–	return true;
652	–	}
653	–	public void run() { invoke(); }
654	–	private static final long serialVersionUID = 5232453952276885070L;
655	–	}
656	–
657	–	/**
658	–	* Adaptor for Callables
659	–	*/
660	–	static final class AdaptedCallable<T> extends ForkJoinTask<T>
661	–	implements RunnableFuture<T> {
662	–	final Callable<T> callable;
663	–	T result;
664	–	AdaptedCallable(Callable<T> callable) {
665	–	if (callable == null) throw new NullPointerException();
666	–	this.callable = callable;
667	–	}
668	–	public T getRawResult() { return result; }
669	–	public void setRawResult(T v) { result = v; }
670	–	public boolean exec() {
671	–	try {
672	–	result = callable.call();
673	–	return true;
674	–	} catch (Error err) {
675	–	throw err;
676	–	} catch (RuntimeException rex) {
677	–	throw rex;
678	–	} catch (Exception ex) {
679	–	throw new RuntimeException(ex);
680	–	}
681	–	}
682	–	public void run() { invoke(); }
683	–	private static final long serialVersionUID = 2838392045355241008L;
684	–	}
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 720 | 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 741 | 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 815 | 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 851 | 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.
857	<	* 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 867 | 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 878 | 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 900 | 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 944 | 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 1018 | 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 1032 | 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 1055 | 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 1121 | 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 1132 | 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 1492 | 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 1500 | 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 1519 | 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 1604 | 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 1773 | Line 1735 | public class ForkJoinPool extends Abstra
1735
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.).
1738	>	* in {@link ForkJoinPool}s.
1739	>	*
1740	>	* <p>A {@code ManagedBlocker} provides two methods.
1741	>	* Method {@code isReleasable} must return {@code true} if
1742	>	* blocking is not necessary. Method {@code block} blocks the
1743	>	* current thread if necessary (perhaps internally invoking
1744	>	* {@code isReleasable} before actually blocking.).
1745		*
1746		* <p>For example, here is a ManagedBlocker based on a
1747		* ReentrantLock:
#	Line 1801 | Line 1765 | public class ForkJoinPool extends Abstra
1765		* Possibly blocks the current thread, for example waiting for
1766		* a lock or condition.
1767		*
1768	<	* @return true if no additional blocking is necessary (i.e.,
1769	<	* if isReleasable would return true)
1768	>	* @return {@code true} if no additional blocking is necessary
1769	>	* (i.e., if isReleasable would return true)
1770		* @throws InterruptedException if interrupted while waiting
1771		* (the method is not required to do so, but is allowed to)
1772		*/
1773		boolean block() throws InterruptedException;
1774
1775		/**
1776	<	* Returns true if blocking is unnecessary.
1776	>	* Returns {@code true} if blocking is unnecessary.
1777		*/
1778		boolean isReleasable();
1779		}
#	Line 1819 | Line 1783 | public class ForkJoinPool extends Abstra
1783		* is a ForkJoinWorkerThread, this method possibly arranges for a
1784		* spare thread to be activated if necessary to ensure parallelism
1785		* while the current thread is blocked.  If
1786	<	* {@code maintainParallelism} is true and the pool supports
1786	>	* {@code maintainParallelism} is {@code true} and the pool supports
1787		* it ({@link #getMaintainsParallelism}), this method attempts to
1788		* maintain the pool's nominal parallelism. Otherwise it activates
1789		* a thread only if necessary to avoid complete starvation. This
#	Line 1837 | Line 1801 | public class ForkJoinPool extends Abstra
1801		* be expanded to ensure parallelism, and later adjusted.
1802		*
1803		* @param blocker the blocker
1804	<	* @param maintainParallelism if true and supported by this pool,
1805	<	* attempt to maintain the pool's nominal parallelism; otherwise
1806	<	* activate a thread only if necessary to avoid complete
1807	<	* starvation.
1804	>	* @param maintainParallelism if {@code true} and supported by
1805	>	* this pool, attempt to maintain the pool's nominal parallelism;
1806	>	* otherwise activate a thread only if necessary to avoid
1807	>	* complete starvation.
1808		* @throws InterruptedException if blocker.block did so
1809		*/
1810		public static void managedBlock(ManagedBlocker blocker,
#	Line 1866 | Line 1830 | public class ForkJoinPool extends Abstra
1830		do {} while (!blocker.isReleasable() && !blocker.block());
1831		}
1832
1833	<	// AbstractExecutorService overrides
1833	>	// AbstractExecutorService overrides.  These rely on undocumented
1834	>	// fact that ForkJoinTask.adapt returns ForkJoinTasks that also
1835	>	// implement RunnableFuture.
1836
1837		protected <T> RunnableFuture<T> newTaskFor(Runnable runnable, T value) {
1838	<	return new AdaptedRunnable<T>(runnable, value);
1838	>	return (RunnableFuture<T>) ForkJoinTask.adapt(runnable, value);
1839		}
1840
1841		protected <T> RunnableFuture<T> newTaskFor(Callable<T> callable) {
1842	<	return new AdaptedCallable<T>(callable);
1877	<	}
1878	<
1879	<
1880	<	// Unsafe mechanics for jsr166y 3rd party package.
1881	<	private static sun.misc.Unsafe getUnsafe() {
1882	<	try {
1883	<	return sun.misc.Unsafe.getUnsafe();
1884	<	} catch (SecurityException se) {
1885	<	try {
1886	<	return java.security.AccessController.doPrivileged
1887	<	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
1888	<	public sun.misc.Unsafe run() throws Exception {
1889	<	return getUnsafeByReflection();
1890	<	}});
1891	<	} catch (java.security.PrivilegedActionException e) {
1892	<	throw new RuntimeException("Could not initialize intrinsics",
1893	<	e.getCause());
1894	<	}
1895	<	}
1842	>	return (RunnableFuture<T>) ForkJoinTask.adapt(callable);
1843		}
1844
1845	<	private static sun.misc.Unsafe getUnsafeByReflection()
1899	<	throws NoSuchFieldException, IllegalAccessException {
1900	<	java.lang.reflect.Field f =
1901	<	sun.misc.Unsafe.class.getDeclaredField("theUnsafe");
1902	<	f.setAccessible(true);
1903	<	return (sun.misc.Unsafe) f.get(null);
1904	<	}
1905	<
1906	<	private static long fieldOffset(String fieldName, Class<?> klazz) {
1907	<	try {
1908	<	return UNSAFE.objectFieldOffset(klazz.getDeclaredField(fieldName));
1909	<	} catch (NoSuchFieldException e) {
1910	<	// Convert Exception to Error
1911	<	NoSuchFieldError error = new NoSuchFieldError(fieldName);
1912	<	error.initCause(e);
1913	<	throw error;
1914	<	}
1915	<	}
1845	>	// Unsafe mechanics
1846
1847		private static final sun.misc.Unsafe UNSAFE = getUnsafe();
1848	<	static final long eventCountOffset =
1849	<	fieldOffset("eventCount", ForkJoinPool.class);
1850	<	static final long workerCountsOffset =
1851	<	fieldOffset("workerCounts", ForkJoinPool.class);
1852	<	static final long runControlOffset =
1853	<	fieldOffset("runControl", ForkJoinPool.class);
1854	<	static final long syncStackOffset =
1855	<	fieldOffset("syncStack",ForkJoinPool.class);
1856	<	static final long spareStackOffset =
1857	<	fieldOffset("spareStack", ForkJoinPool.class);
1848	>	private static final long eventCountOffset =
1849	>	objectFieldOffset("eventCount", ForkJoinPool.class);
1850	>	private static final long workerCountsOffset =
1851	>	objectFieldOffset("workerCounts", ForkJoinPool.class);
1852	>	private static final long runControlOffset =
1853	>	objectFieldOffset("runControl", ForkJoinPool.class);
1854	>	private static final long syncStackOffset =
1855	>	objectFieldOffset("syncStack",ForkJoinPool.class);
1856	>	private static final long spareStackOffset =
1857	>	objectFieldOffset("spareStack", ForkJoinPool.class);
1858
1859		private boolean casEventCount(long cmp, long val) {
1860		return UNSAFE.compareAndSwapLong(this, eventCountOffset, cmp, val);
#	Line 1941 | Line 1871 | public class ForkJoinPool extends Abstra
1871		private boolean casBarrierStack(WaitQueueNode cmp, WaitQueueNode val) {
1872		return UNSAFE.compareAndSwapObject(this, syncStackOffset, cmp, val);
1873		}
1874	+
1875	+	private static long objectFieldOffset(String field, Class<?> klazz) {
1876	+	try {
1877	+	return UNSAFE.objectFieldOffset(klazz.getDeclaredField(field));
1878	+	} catch (NoSuchFieldException e) {
1879	+	// Convert Exception to corresponding Error
1880	+	NoSuchFieldError error = new NoSuchFieldError(field);
1881	+	error.initCause(e);
1882	+	throw error;
1883	+	}
1884	+	}
1885	+
1886	+	/**
1887	+	* Returns a sun.misc.Unsafe.  Suitable for use in a 3rd party package.
1888	+	* Replace with a simple call to Unsafe.getUnsafe when integrating
1889	+	* into a jdk.
1890	+	*
1891	+	* @return a sun.misc.Unsafe
1892	+	*/
1893	+	private static sun.misc.Unsafe getUnsafe() {
1894	+	try {
1895	+	return sun.misc.Unsafe.getUnsafe();
1896	+	} catch (SecurityException se) {
1897	+	try {
1898	+	return java.security.AccessController.doPrivileged
1899	+	(new java.security
1900	+	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
1901	+	public sun.misc.Unsafe run() throws Exception {
1902	+	java.lang.reflect.Field f = sun.misc
1903	+	.Unsafe.class.getDeclaredField("theUnsafe");
1904	+	f.setAccessible(true);
1905	+	return (sun.misc.Unsafe) f.get(null);
1906	+	}});
1907	+	} catch (java.security.PrivilegedActionException e) {
1908	+	throw new RuntimeException("Could not initialize intrinsics",
1909	+	e.getCause());
1910	+	}
1911	+	}
1912	+	}
1913		}

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