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root/jsr166/jsr166/src/test/tck/ForkJoinPoolTest.java

Comparing jsr166/src/test/tck/ForkJoinPoolTest.java (file contents):
Revision 1.25 by jsr166, Mon Sep 13 20:48:58 2010 UTC vs.
Revision 1.40 by jsr166, Sun May 15 17:32:29 2011 UTC

#	Line 1 | Line 1
1		/*
2		* Written by Doug Lea with assistance from members of JCP JSR-166
3		* Expert Group and released to the public domain, as explained at
4	<	* http://creativecommons.org/licenses/publicdomain
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5		*/
6
7		import junit.framework.*;
#	Line 23 | Line 23 | import java.util.concurrent.ForkJoinWork
23		import java.util.concurrent.RecursiveTask;
24		import java.util.concurrent.TimeUnit;
25		import java.util.concurrent.locks.ReentrantLock;
26	+	import static java.util.concurrent.TimeUnit.MILLISECONDS;
27		import java.security.AccessControlException;
28		import java.security.Policy;
29		import java.security.PrivilegedAction;
#	Line 161 | Line 162 | public class ForkJoinPoolTest extends JS
162		public void testDefaultInitialState() {
163		ForkJoinPool p = new ForkJoinPool(1);
164		try {
165	<	assertTrue(p.getFactory() ==
166	<	ForkJoinPool.defaultForkJoinWorkerThreadFactory);
166	<	assertTrue(p.isQuiescent());
165	>	assertSame(ForkJoinPool.defaultForkJoinWorkerThreadFactory,
166	>	p.getFactory());
167		assertFalse(p.getAsyncMode());
168	<	assertTrue(p.getActiveThreadCount() == 0);
169	<	assertTrue(p.getStealCount() == 0);
170	<	assertTrue(p.getQueuedTaskCount() == 0);
171	<	assertTrue(p.getQueuedSubmissionCount() == 0);
168	>	assertEquals(0, p.getActiveThreadCount());
169	>	assertEquals(0, p.getStealCount());
170	>	assertEquals(0, p.getQueuedTaskCount());
171	>	assertEquals(0, p.getQueuedSubmissionCount());
172		assertFalse(p.hasQueuedSubmissions());
173		assertFalse(p.isShutdown());
174		assertFalse(p.isTerminating());
#	Line 205 | Line 205 | public class ForkJoinPoolTest extends JS
205		public void testGetParallelism() {
206		ForkJoinPool p = new ForkJoinPool(1);
207		try {
208	<	assertTrue(p.getParallelism() == 1);
208	>	assertEquals(1, p.getParallelism());
209		} finally {
210		joinPool(p);
211		}
#	Line 217 | Line 217 | public class ForkJoinPoolTest extends JS
217		public void testGetPoolSize() {
218		ForkJoinPool p = new ForkJoinPool(1);
219		try {
220	<	assertTrue(p.getActiveThreadCount() == 0);
220	>	assertEquals(0, p.getActiveThreadCount());
221		Future<String> future = p.submit(new StringTask());
222	<	assertTrue(p.getPoolSize() == 1);
222	>	assertEquals(1, p.getPoolSize());
223		} finally {
224		joinPool(p);
225		}
#	Line 232 | Line 232 | public class ForkJoinPoolTest extends JS
232		* performs its defined action
233		*/
234		public void testSetUncaughtExceptionHandler() throws InterruptedException {
235	<	MyHandler eh = new MyHandler();
236	<	ForkJoinPool p = new ForkJoinPool(1, new FailingThreadFactory(), eh, false);
237	<	try {
238	<	assert(eh == p.getUncaughtExceptionHandler());
239	<	p.execute(new FailingTask());
240	<	Thread.sleep(MEDIUM_DELAY_MS);
241	<	assertTrue(eh.catches > 0);
235	>	final CountDownLatch uehInvoked = new CountDownLatch(1);
236	>	final Thread.UncaughtExceptionHandler eh =
237	>	new Thread.UncaughtExceptionHandler() {
238	>	public void uncaughtException(Thread t, Throwable e) {
239	>	uehInvoked.countDown();
240	>	}};
241	>	ForkJoinPool p = new ForkJoinPool(1, new FailingThreadFactory(),
242	>	eh, false);
243	>	try {
244	>	assertSame(eh, p.getUncaughtExceptionHandler());
245	>	p.execute(new FibTask(8));
246	>	assertTrue(uehInvoked.await(MEDIUM_DELAY_MS, MILLISECONDS));
247		} finally {
248	<	p.shutdownNow();
248	>	p.shutdownNow(); // failure might have prevented processing task
249		joinPool(p);
250		}
251		}
252
253		/**
254	<	* After invoking a single task, isQuiescent is true,
255	<	* queues are empty, threads are not active, and
256	<	* construction parameters continue to hold
254	>	* After invoking a single task, isQuiescent eventually becomes
255	>	* true, at which time queues are empty, threads are not active,
256	>	* the task has completed successfully, and construction
257	>	* parameters continue to hold
258		*/
259	<	public void testisQuiescent() throws InterruptedException {
259	>	public void testisQuiescent() throws Exception {
260		ForkJoinPool p = new ForkJoinPool(2);
261		try {
262	<	p.invoke(new FibTask(20));
263	<	assertTrue(p.getFactory() ==
264	<	ForkJoinPool.defaultForkJoinWorkerThreadFactory);
265	<	Thread.sleep(MEDIUM_DELAY_MS);
262	>	assertTrue(p.isQuiescent());
263	>	long startTime = System.nanoTime();
264	>	FibTask f = new FibTask(20);
265	>	p.invoke(f);
266	>	assertSame(ForkJoinPool.defaultForkJoinWorkerThreadFactory,
267	>	p.getFactory());
268	>	while (! p.isQuiescent()) {
269	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
270	>	throw new AssertionFailedError("timed out");
271	>	assertFalse(p.getAsyncMode());
272	>	assertFalse(p.isShutdown());
273	>	assertFalse(p.isTerminating());
274	>	assertFalse(p.isTerminated());
275	>	Thread.yield();
276	>	}
277	>
278		assertTrue(p.isQuiescent());
279		assertFalse(p.getAsyncMode());
280	<	assertTrue(p.getActiveThreadCount() == 0);
281	<	assertTrue(p.getQueuedTaskCount() == 0);
282	<	assertTrue(p.getQueuedSubmissionCount() == 0);
280	>	assertEquals(0, p.getActiveThreadCount());
281	>	assertEquals(0, p.getQueuedTaskCount());
282	>	assertEquals(0, p.getQueuedSubmissionCount());
283		assertFalse(p.hasQueuedSubmissions());
284		assertFalse(p.isShutdown());
285		assertFalse(p.isTerminating());
286		assertFalse(p.isTerminated());
287	+	assertTrue(f.isDone());
288	+	assertEquals(6765, (int) f.get());
289		} finally {
290		joinPool(p);
291		}
#	Line 278 | Line 298 | public class ForkJoinPoolTest extends JS
298		ForkJoinPool p = new ForkJoinPool(1);
299		try {
300		ForkJoinTask<Integer> f = p.submit(new FibTask(8));
301	<	int r = f.get();
282	<	assertTrue(r == 21);
301	>	assertEquals(21, (int) f.get());
302		} finally {
303		joinPool(p);
304		}
#	Line 293 | Line 312 | public class ForkJoinPoolTest extends JS
312		try {
313		p.shutdown();
314		assertTrue(p.isShutdown());
315	<	ForkJoinTask<Integer> f = p.submit(new FibTask(8));
316	<	shouldThrow();
317	<	} catch (RejectedExecutionException success) {
315	>	try {
316	>	ForkJoinTask<Integer> f = p.submit(new FibTask(8));
317	>	shouldThrow();
318	>	} catch (RejectedExecutionException success) {}
319		} finally {
320		joinPool(p);
321		}
#	Line 309 | Line 329 | public class ForkJoinPoolTest extends JS
329		try {
330		ReentrantLock lock = new ReentrantLock();
331		ManagedLocker locker = new ManagedLocker(lock);
332	<	ForkJoinTask<Integer> f = new LockingFibTask(30, locker, lock);
332	>	ForkJoinTask<Integer> f = new LockingFibTask(20, locker, lock);
333		p.execute(f);
334	<	int r = f.get();
315	<	assertTrue(r == 832040);
334	>	assertEquals(6765, (int) f.get());
335		} finally {
336		p.shutdownNow(); // don't wait out shutdown
337		}
#	Line 322 | Line 341 | public class ForkJoinPoolTest extends JS
341		* pollSubmission returns unexecuted submitted task, if present
342		*/
343		public void testPollSubmission() {
344	+	final CountDownLatch done = new CountDownLatch(1);
345		SubFJP p = new SubFJP();
346		try {
347	<	ForkJoinTask a = p.submit(new MediumRunnable());
348	<	ForkJoinTask b = p.submit(new MediumRunnable());
349	<	ForkJoinTask c = p.submit(new MediumRunnable());
347	>	ForkJoinTask a = p.submit(awaiter(done));
348	>	ForkJoinTask b = p.submit(awaiter(done));
349	>	ForkJoinTask c = p.submit(awaiter(done));
350		ForkJoinTask r = p.pollSubmission();
351		assertTrue(r == a || r == b || r == c);
352		assertFalse(r.isDone());
353		} finally {
354	+	done.countDown();
355		joinPool(p);
356		}
357		}
#	Line 339 | Line 360 | public class ForkJoinPoolTest extends JS
360		* drainTasksTo transfers unexecuted submitted tasks, if present
361		*/
362		public void testDrainTasksTo() {
363	+	final CountDownLatch done = new CountDownLatch(1);
364		SubFJP p = new SubFJP();
365		try {
366	<	ForkJoinTask a = p.submit(new MediumRunnable());
367	<	ForkJoinTask b = p.submit(new MediumRunnable());
368	<	ForkJoinTask c = p.submit(new MediumRunnable());
366	>	ForkJoinTask a = p.submit(awaiter(done));
367	>	ForkJoinTask b = p.submit(awaiter(done));
368	>	ForkJoinTask c = p.submit(awaiter(done));
369		ArrayList<ForkJoinTask> al = new ArrayList();
370		p.drainTasksTo(al);
371		assertTrue(al.size() > 0);
#	Line 352 | Line 374 | public class ForkJoinPoolTest extends JS
374		assertFalse(r.isDone());
375		}
376		} finally {
377	+	done.countDown();
378		joinPool(p);
379		}
380		}
#	Line 365 | Line 388 | public class ForkJoinPoolTest extends JS
388		public void testExecuteRunnable() throws Throwable {
389		ExecutorService e = new ForkJoinPool(1);
390		try {
391	<	TrackedShortRunnable task = new TrackedShortRunnable();
392	<	assertFalse(task.done);
391	>	TrackedRunnable task = trackedRunnable(SHORT_DELAY_MS);
392	>	assertFalse(task.isDone());
393		Future<?> future = e.submit(task);
394	<	future.get();
395	<	assertTrue(task.done);
394	>	assertNull(future.get());
395	>	assertNull(future.get(MEDIUM_DELAY_MS, MILLISECONDS));
396	>	assertTrue(task.isDone());
397	>	assertTrue(future.isDone());
398	>	assertFalse(future.isCancelled());
399		} finally {
400		joinPool(e);
401		}
#	Line 383 | Line 409 | public class ForkJoinPoolTest extends JS
409		ExecutorService e = new ForkJoinPool(1);
410		try {
411		Future<String> future = e.submit(new StringTask());
412	<	String result = future.get();
413	<	assertSame(TEST_STRING, result);
412	>	assertSame(TEST_STRING, future.get());
413	>	assertTrue(future.isDone());
414	>	assertFalse(future.isCancelled());
415		} finally {
416		joinPool(e);
417		}
#	Line 397 | Line 424 | public class ForkJoinPoolTest extends JS
424		ExecutorService e = new ForkJoinPool(1);
425		try {
426		Future<?> future = e.submit(new NoOpRunnable());
427	<	future.get();
427	>	assertNull(future.get());
428		assertTrue(future.isDone());
429	+	assertFalse(future.isCancelled());
430		} finally {
431		joinPool(e);
432		}
#	Line 411 | Line 439 | public class ForkJoinPoolTest extends JS
439		ExecutorService e = new ForkJoinPool(1);
440		try {
441		Future<String> future = e.submit(new NoOpRunnable(), TEST_STRING);
442	<	String result = future.get();
443	<	assertSame(TEST_STRING, result);
442	>	assertSame(TEST_STRING, future.get());
443	>	assertTrue(future.isDone());
444	>	assertFalse(future.isCancelled());
445		} finally {
446		joinPool(e);
447		}
448		}
449
421	–
450		/**
451	<	* A submitted privileged action to completion
451	>	* A submitted privileged action runs to completion
452		*/
453	<	public void testSubmitPrivilegedAction() throws Throwable {
454	<	Policy savedPolicy = null;
455	<	try {
456	<	savedPolicy = Policy.getPolicy();
429	<	AdjustablePolicy policy = new AdjustablePolicy();
430	<	policy.addPermission(new RuntimePermission("getContextClassLoader"));
431	<	policy.addPermission(new RuntimePermission("setContextClassLoader"));
432	<	Policy.setPolicy(policy);
433	<	} catch (AccessControlException ok) {
434	<	return;
435	<	}
436	<
437	<	try {
438	<	ExecutorService e = new ForkJoinPool(1);
439	<	try {
453	>	public void testSubmitPrivilegedAction() throws Exception {
454	>	Runnable r = new CheckedRunnable() {
455	>	public void realRun() throws Exception {
456	>	ExecutorService e = new ForkJoinPool(1);
457		Future future = e.submit(Executors.callable(new PrivilegedAction() {
458		public Object run() {
459		return TEST_STRING;
460		}}));
461
462	<	Object result = future.get();
463	<	assertSame(TEST_STRING, result);
464	<	} finally {
465	<	joinPool(e);
466	<	}
450	<	} finally {
451	<	Policy.setPolicy(savedPolicy);
452	<	}
462	>	assertSame(TEST_STRING, future.get());
463	>	}};
464	>
465	>	runWithPermissions(r,
466	>	new RuntimePermission("modifyThread"));
467		}
468
469		/**
470	<	* A submitted a privileged exception action runs to completion
470	>	* A submitted privileged exception action runs to completion
471		*/
472	<	public void testSubmitPrivilegedExceptionAction() throws Throwable {
473	<	Policy savedPolicy = null;
474	<	try {
475	<	savedPolicy = Policy.getPolicy();
462	<	AdjustablePolicy policy = new AdjustablePolicy();
463	<	policy.addPermission(new RuntimePermission("getContextClassLoader"));
464	<	policy.addPermission(new RuntimePermission("setContextClassLoader"));
465	<	Policy.setPolicy(policy);
466	<	} catch (AccessControlException ok) {
467	<	return;
468	<	}
469	<
470	<	try {
471	<	ExecutorService e = new ForkJoinPool(1);
472	<	try {
472	>	public void testSubmitPrivilegedExceptionAction() throws Exception {
473	>	Runnable r = new CheckedRunnable() {
474	>	public void realRun() throws Exception {
475	>	ExecutorService e = new ForkJoinPool(1);
476		Future future = e.submit(Executors.callable(new PrivilegedExceptionAction() {
477		public Object run() {
478		return TEST_STRING;
479		}}));
480
481	<	Object result = future.get();
482	<	assertSame(TEST_STRING, result);
483	<	} finally {
484	<	joinPool(e);
482	<	}
483	<	} finally {
484	<	Policy.setPolicy(savedPolicy);
485	<	}
481	>	assertSame(TEST_STRING, future.get());
482	>	}};
483	>
484	>	runWithPermissions(r, new RuntimePermission("modifyThread"));
485		}
486
487		/**
488		* A submitted failed privileged exception action reports exception
489		*/
490	<	public void testSubmitFailedPrivilegedExceptionAction() throws Throwable {
491	<	Policy savedPolicy = null;
492	<	try {
493	<	savedPolicy = Policy.getPolicy();
495	<	AdjustablePolicy policy = new AdjustablePolicy();
496	<	policy.addPermission(new RuntimePermission("getContextClassLoader"));
497	<	policy.addPermission(new RuntimePermission("setContextClassLoader"));
498	<	Policy.setPolicy(policy);
499	<	} catch (AccessControlException ok) {
500	<	return;
501	<	}
502	<
503	<	try {
504	<	ExecutorService e = new ForkJoinPool(1);
505	<	try {
490	>	public void testSubmitFailedPrivilegedExceptionAction() throws Exception {
491	>	Runnable r = new CheckedRunnable() {
492	>	public void realRun() throws Exception {
493	>	ExecutorService e = new ForkJoinPool(1);
494		Future future = e.submit(Executors.callable(new PrivilegedExceptionAction() {
495		public Object run() throws Exception {
496		throw new IndexOutOfBoundsException();
497		}}));
498
499	<	Object result = future.get();
500	<	shouldThrow();
501	<	} catch (ExecutionException success) {
502	<	assertTrue(success.getCause() instanceof IndexOutOfBoundsException);
503	<	} finally {
504	<	joinPool(e);
505	<	}
506	<	} finally {
519	<	Policy.setPolicy(savedPolicy);
520	<	}
499	>	try {
500	>	future.get();
501	>	shouldThrow();
502	>	} catch (ExecutionException success) {
503	>	assertTrue(success.getCause() instanceof IndexOutOfBoundsException);
504	>	}}};
505	>
506	>	runWithPermissions(r, new RuntimePermission("modifyThread"));
507		}
508
509		/**
#	Line 526 | Line 512 | public class ForkJoinPoolTest extends JS
512		public void testExecuteNullRunnable() {
513		ExecutorService e = new ForkJoinPool(1);
514		try {
515	<	TrackedShortRunnable task = null;
530	<	Future<?> future = e.submit(task);
515	>	Future<?> future = e.submit((Runnable) null);
516		shouldThrow();
517		} catch (NullPointerException success) {
518		} finally {
#	Line 542 | Line 527 | public class ForkJoinPoolTest extends JS
527		public void testSubmitNullCallable() {
528		ExecutorService e = new ForkJoinPool(1);
529		try {
530	<	StringTask t = null;
546	<	Future<String> future = e.submit(t);
530	>	Future<String> future = e.submit((Callable) null);
531		shouldThrow();
532		} catch (NullPointerException success) {
533		} finally {
#	Line 553 | Line 537 | public class ForkJoinPoolTest extends JS
537
538
539		/**
540	<	* Blocking on submit(callable) throws InterruptedException if
557	<	* caller interrupted.
540	>	* submit(callable).get() throws InterruptedException if interrupted
541		*/
542		public void testInterruptedSubmit() throws InterruptedException {
543	<	final ForkJoinPool p = new ForkJoinPool(1);
544	<
545	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
546	<	public void realRun() throws Throwable {
547	<	p.submit(new CheckedCallable<Object>() {
548	<	public Object realCall() throws Throwable {
549	<	try {
550	<	Thread.sleep(MEDIUM_DELAY_MS);
551	<	} catch (InterruptedException ok) {
552	<	}
553	<	return null;
554	<	}}).get();
555	<	}});
556	<
557	<	t.start();
558	<	Thread.sleep(SHORT_DELAY_MS);
559	<	t.interrupt();
560	<	t.join();
561	<	p.shutdownNow();
562	<	joinPool(p);
543	>	final CountDownLatch submitted    = new CountDownLatch(1);
544	>	final CountDownLatch quittingTime = new CountDownLatch(1);
545	>	final ExecutorService p = new ForkJoinPool(1);
546	>	final Callable<Void> awaiter = new CheckedCallable<Void>() {
547	>	public Void realCall() throws InterruptedException {
548	>	assertTrue(quittingTime.await(MEDIUM_DELAY_MS, MILLISECONDS));
549	>	return null;
550	>	}};
551	>	try {
552	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
553	>	public void realRun() throws Exception {
554	>	Future<Void> future = p.submit(awaiter);
555	>	submitted.countDown();
556	>	future.get();
557	>	}});
558	>	t.start();
559	>	assertTrue(submitted.await(MEDIUM_DELAY_MS, MILLISECONDS));
560	>	t.interrupt();
561	>	t.join();
562	>	} finally {
563	>	quittingTime.countDown();
564	>	joinPool(p);
565	>	}
566		}
567
568		/**
#	Line 785 | Line 771 | public class ForkJoinPoolTest extends JS
771		public void testTimedInvokeAny1() throws Throwable {
772		ExecutorService e = new ForkJoinPool(1);
773		try {
774	<	e.invokeAny(null, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
774	>	e.invokeAny(null, MEDIUM_DELAY_MS, MILLISECONDS);
775		shouldThrow();
776		} catch (NullPointerException success) {
777		} finally {
#	Line 816 | Line 802 | public class ForkJoinPoolTest extends JS
802		ExecutorService e = new ForkJoinPool(1);
803		try {
804		e.invokeAny(new ArrayList<Callable<String>>(),
805	<	MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
805	>	MEDIUM_DELAY_MS, MILLISECONDS);
806		shouldThrow();
807		} catch (IllegalArgumentException success) {
808		} finally {
#	Line 834 | Line 820 | public class ForkJoinPoolTest extends JS
820		l.add(latchAwaitingStringTask(latch));
821		l.add(null);
822		try {
823	<	e.invokeAny(l, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
823	>	e.invokeAny(l, MEDIUM_DELAY_MS, MILLISECONDS);
824		shouldThrow();
825		} catch (NullPointerException success) {
826		} finally {
#	Line 851 | Line 837 | public class ForkJoinPoolTest extends JS
837		List<Callable<String>> l = new ArrayList<Callable<String>>();
838		l.add(new NPETask());
839		try {
840	<	e.invokeAny(l, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
840	>	e.invokeAny(l, MEDIUM_DELAY_MS, MILLISECONDS);
841		shouldThrow();
842		} catch (ExecutionException success) {
843		assertTrue(success.getCause() instanceof NullPointerException);
#	Line 869 | Line 855 | public class ForkJoinPoolTest extends JS
855		List<Callable<String>> l = new ArrayList<Callable<String>>();
856		l.add(new StringTask());
857		l.add(new StringTask());
858	<	String result = e.invokeAny(l, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
858	>	String result = e.invokeAny(l, MEDIUM_DELAY_MS, MILLISECONDS);
859		assertSame(TEST_STRING, result);
860		} finally {
861		joinPool(e);
#	Line 882 | Line 868 | public class ForkJoinPoolTest extends JS
868		public void testTimedInvokeAll1() throws Throwable {
869		ExecutorService e = new ForkJoinPool(1);
870		try {
871	<	e.invokeAll(null, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
871	>	e.invokeAll(null, MEDIUM_DELAY_MS, MILLISECONDS);
872		shouldThrow();
873		} catch (NullPointerException success) {
874		} finally {
#	Line 914 | Line 900 | public class ForkJoinPoolTest extends JS
900		try {
901		List<Future<String>> r
902		= e.invokeAll(new ArrayList<Callable<String>>(),
903	<	MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
903	>	MEDIUM_DELAY_MS, MILLISECONDS);
904		assertTrue(r.isEmpty());
905		} finally {
906		joinPool(e);
#	Line 930 | Line 916 | public class ForkJoinPoolTest extends JS
916		l.add(new StringTask());
917		l.add(null);
918		try {
919	<	e.invokeAll(l, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
919	>	e.invokeAll(l, MEDIUM_DELAY_MS, MILLISECONDS);
920		shouldThrow();
921		} catch (NullPointerException success) {
922		} finally {
#	Line 946 | Line 932 | public class ForkJoinPoolTest extends JS
932		List<Callable<String>> l = new ArrayList<Callable<String>>();
933		l.add(new NPETask());
934		List<Future<String>> futures
935	<	= e.invokeAll(l, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
935	>	= e.invokeAll(l, MEDIUM_DELAY_MS, MILLISECONDS);
936		assertEquals(1, futures.size());
937		try {
938		futures.get(0).get();
#	Line 968 | Line 954 | public class ForkJoinPoolTest extends JS
954		l.add(new StringTask());
955		l.add(new StringTask());
956		List<Future<String>> futures
957	<	= e.invokeAll(l, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
957	>	= e.invokeAll(l, MEDIUM_DELAY_MS, MILLISECONDS);
958		assertEquals(2, futures.size());
959		for (Future<String> future : futures)
960		assertSame(TEST_STRING, future.get());

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