ViewVC Help

View File | Revision Log | Show Annotations | Download File | Root Listing

root/jsr166/jsr166/src/jsr166e/ForkJoinTask.java

Comparing jsr166/src/jsr166e/ForkJoinTask.java (file contents):
Revision 1.9 by dl, Tue Jan 1 15:10:32 2013 UTC vs.
Revision 1.14 by jsr166, Sun Jul 21 06:32:28 2013 UTC

#	Line 134 | Line 134 | import java.lang.reflect.Constructor;
134		* (DAG). Otherwise, executions may encounter a form of deadlock as
135		* tasks cyclically wait for each other.  However, this framework
136		* supports other methods and techniques (for example the use of
137	<	* {@link Phaser}, {@link #helpQuiesce}, and {@link #complete}) that
137	>	* {@link java.util.concurrent.Phaser Phaser}, {@link #helpQuiesce}, and {@link #complete}) that
138		* may be of use in constructing custom subclasses for problems that
139	<	* are not statically structured as DAGs. To support such usages a
139	>	* are not statically structured as DAGs. To support such usages, a
140		* ForkJoinTask may be atomically <em>tagged</em> with a {@code short}
141		* value using {@link #setForkJoinTaskTag} or {@link
142		* #compareAndSetForkJoinTaskTag} and checked using {@link
#	Line 285 | Line 285 | public abstract class ForkJoinTask<V> im
285		*/
286		private int externalAwaitDone() {
287		int s;
288	<	ForkJoinPool.externalHelpJoin(this);
289	<	boolean interrupted = false;
290	<	while ((s = status) >= 0) {
291	<	if (U.compareAndSwapInt(this, STATUS, s, s | SIGNAL)) {
292	<	synchronized (this) {
293	<	if (status >= 0) {
294	<	try {
295	<	wait();
296	<	} catch (InterruptedException ie) {
297	<	interrupted = true;
288	>	ForkJoinPool cp = ForkJoinPool.common;
289	>	if ((s = status) >= 0) {
290	>	if (cp != null) {
291	>	if (this instanceof CountedCompleter)
292	>	s = cp.externalHelpComplete((CountedCompleter<?>)this);
293	>	else if (cp.tryExternalUnpush(this))
294	>	s = doExec();
295	>	}
296	>	if (s >= 0 && (s = status) >= 0) {
297	>	boolean interrupted = false;
298	>	do {
299	>	if (U.compareAndSwapInt(this, STATUS, s, s | SIGNAL)) {
300	>	synchronized (this) {
301	>	if (status >= 0) {
302	>	try {
303	>	wait();
304	>	} catch (InterruptedException ie) {
305	>	interrupted = true;
306	>	}
307	>	}
308	>	else
309	>	notifyAll();
310		}
311		}
312	<	else
313	<	notifyAll();
314	<	}
312	>	} while ((s = status) >= 0);
313	>	if (interrupted)
314	>	Thread.currentThread().interrupt();
315		}
316		}
305	–	if (interrupted)
306	–	Thread.currentThread().interrupt();
317		return s;
318		}
319
#	Line 312 | Line 322 | public abstract class ForkJoinTask<V> im
322		*/
323		private int externalInterruptibleAwaitDone() throws InterruptedException {
324		int s;
325	+	ForkJoinPool cp = ForkJoinPool.common;
326		if (Thread.interrupted())
327		throw new InterruptedException();
328	<	ForkJoinPool.externalHelpJoin(this);
328	>	if ((s = status) >= 0 && cp != null) {
329	>	if (this instanceof CountedCompleter)
330	>	cp.externalHelpComplete((CountedCompleter<?>)this);
331	>	else if (cp.tryExternalUnpush(this))
332	>	doExec();
333	>	}
334		while ((s = status) >= 0) {
335		if (U.compareAndSwapInt(this, STATUS, s, s | SIGNAL)) {
336		synchronized (this) {
#	Line 468 | Line 484 | public abstract class ForkJoinTask<V> im
484		}
485
486		/**
487	<	* Removes exception node and clears status
487	>	* Removes exception node and clears status.
488		*/
489		private void clearExceptionalCompletion() {
490		int h = System.identityHashCode(this);
#	Line 600 | Line 616 | public abstract class ForkJoinTask<V> im
616		/**
617		* A version of "sneaky throw" to relay exceptions
618		*/
619	<	static void rethrow(final Throwable ex) {
620	<	if (ex != null) {
605	<	if (ex instanceof Error)
606	<	throw (Error)ex;
607	<	if (ex instanceof RuntimeException)
608	<	throw (RuntimeException)ex;
619	>	static void rethrow(Throwable ex) {
620	>	if (ex != null)
621		ForkJoinTask.<RuntimeException>uncheckedThrow(ex);
610	–	}
622		}
623
624		/**
#	Line 617 | Line 628 | public abstract class ForkJoinTask<V> im
628		*/
629		@SuppressWarnings("unchecked") static <T extends Throwable>
630		void uncheckedThrow(Throwable t) throws T {
631	<	if (t != null)
621	<	throw (T)t; // rely on vacuous cast
631	>	throw (T)t; // rely on vacuous cast
632		}
633
634		/**
#	Line 772 | Line 782 | public abstract class ForkJoinTask<V> im
782		* unprocessed.
783		*
784		* @param tasks the collection of tasks
785	+	* @param <T> the type of the values returned from the tasks
786		* @return the tasks argument, to simplify usage
787		* @throws NullPointerException if tasks or any element are null
788		*/
#	Line 829 | Line 840 | public abstract class ForkJoinTask<V> im
840		* <p>This method is designed to be invoked by <em>other</em>
841		* tasks. To terminate the current task, you can just return or
842		* throw an unchecked exception from its computation method, or
843	<	* invoke {@link #completeExceptionally}.
843	>	* invoke {@link #completeExceptionally(Throwable)}.
844		*
845		* @param mayInterruptIfRunning this value has no effect in the
846		* default implementation because interrupts are not used to
#	Line 981 | Line 992 | public abstract class ForkJoinTask<V> im
992		// Messy in part because we measure in nanosecs, but wait in millisecs
993		int s; long ms;
994		long ns = unit.toNanos(timeout);
995	+	ForkJoinPool cp;
996		if ((s = status) >= 0 && ns > 0L) {
997		long deadline = System.nanoTime() + ns;
998		ForkJoinPool p = null;
#	Line 992 | Line 1004 | public abstract class ForkJoinTask<V> im
1004		w = wt.workQueue;
1005		p.helpJoinOnce(w, this); // no retries on failure
1006		}
1007	<	else
1008	<	ForkJoinPool.externalHelpJoin(this);
1007	>	else if ((cp = ForkJoinPool.common) != null) {
1008	>	if (this instanceof CountedCompleter)
1009	>	cp.externalHelpComplete((CountedCompleter<?>)this);
1010	>	else if (cp.tryExternalUnpush(this))
1011	>	doExec();
1012	>	}
1013		boolean canBlock = false;
1014		boolean interrupted = false;
1015		try {
#	Line 1001 | Line 1017 | public abstract class ForkJoinTask<V> im
1017		if (w != null && w.qlock < 0)
1018		cancelIgnoringExceptions(this);
1019		else if (!canBlock) {
1020	<	if (p == null || p.tryCompensate())
1020	>	if (p == null || p.tryCompensate(p.ctl))
1021		canBlock = true;
1022		}
1023		else {
#	Line 1142 | Line 1158 | public abstract class ForkJoinTask<V> im
1158		Thread t;
1159		return (((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) ?
1160		((ForkJoinWorkerThread)t).workQueue.tryUnpush(this) :
1161	<	ForkJoinPool.tryExternalUnpush(this));
1161	>	ForkJoinPool.common.tryExternalUnpush(this));
1162		}
1163
1164		/**
#	Line 1311 | Line 1327 | public abstract class ForkJoinTask<V> im
1327		*
1328		* @param e the expected tag value
1329		* @param tag the new tag value
1330	<	* @return true if successful; i.e., the current value was
1330	>	* @return {@code true} if successful; i.e., the current value was
1331		* equal to e and is now tag.
1332		* @since 1.8
1333		*/
#	Line 1364 | Line 1380 | public abstract class ForkJoinTask<V> im
1380		}
1381
1382		/**
1383	+	* Adaptor for Runnables in which failure forces worker exception
1384	+	*/
1385	+	static final class RunnableExecuteAction extends ForkJoinTask<Void> {
1386	+	final Runnable runnable;
1387	+	RunnableExecuteAction(Runnable runnable) {
1388	+	if (runnable == null) throw new NullPointerException();
1389	+	this.runnable = runnable;
1390	+	}
1391	+	public final Void getRawResult() { return null; }
1392	+	public final void setRawResult(Void v) { }
1393	+	public final boolean exec() { runnable.run(); return true; }
1394	+	void internalPropagateException(Throwable ex) {
1395	+	rethrow(ex); // rethrow outside exec() catches.
1396	+	}
1397	+	private static final long serialVersionUID = 5232453952276885070L;
1398	+	}
1399	+
1400	+	/**
1401		* Adaptor for Callables
1402		*/
1403		static final class AdaptedCallable<T> extends ForkJoinTask<T>
#	Line 1411 | Line 1445 | public abstract class ForkJoinTask<V> im
1445		*
1446		* @param runnable the runnable action
1447		* @param result the result upon completion
1448	+	* @param <T> the type of the result
1449		* @return the task
1450		*/
1451		public static <T> ForkJoinTask<T> adapt(Runnable runnable, T result) {
#	Line 1424 | Line 1459 | public abstract class ForkJoinTask<V> im
1459		* encountered into {@code RuntimeException}.
1460		*
1461		* @param callable the callable action
1462	+	* @param <T> the type of the callable's result
1463		* @return the task
1464		*/
1465		public static <T> ForkJoinTask<T> adapt(Callable<? extends T> callable) {
#	Line 1485 | Line 1521 | public abstract class ForkJoinTask<V> im
1521		private static sun.misc.Unsafe getUnsafe() {
1522		try {
1523		return sun.misc.Unsafe.getUnsafe();
1524	<	} catch (SecurityException se) {
1525	<	try {
1526	<	return java.security.AccessController.doPrivileged
1527	<	(new java.security
1528	<	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
1529	<	public sun.misc.Unsafe run() throws Exception {
1530	<	java.lang.reflect.Field f = sun.misc
1531	<	.Unsafe.class.getDeclaredField("theUnsafe");
1532	<	f.setAccessible(true);
1533	<	return (sun.misc.Unsafe) f.get(null);
1534	<	}});
1535	<	} catch (java.security.PrivilegedActionException e) {
1536	<	throw new RuntimeException("Could not initialize intrinsics",
1537	<	e.getCause());
1538	<	}
1524	>	} catch (SecurityException tryReflectionInstead) {}
1525	>	try {
1526	>	return java.security.AccessController.doPrivileged
1527	>	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
1528	>	public sun.misc.Unsafe run() throws Exception {
1529	>	Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
1530	>	for (java.lang.reflect.Field f : k.getDeclaredFields()) {
1531	>	f.setAccessible(true);
1532	>	Object x = f.get(null);
1533	>	if (k.isInstance(x))
1534	>	return k.cast(x);
1535	>	}
1536	>	throw new NoSuchFieldError("the Unsafe");
1537	>	}});
1538	>	} catch (java.security.PrivilegedActionException e) {
1539	>	throw new RuntimeException("Could not initialize intrinsics",
1540	>	e.getCause());
1541		}
1542		}
1505	–
1543		}

Diff Legend

–	Removed lines
+	Added lines
<	Changed lines
>	Changed lines