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

Comparing jsr166/src/test/tck/ThreadPoolExecutorTest.java (file contents):
Revision 1.120 by jsr166, Sat Jul 15 18:17:40 2017 UTC vs.
Revision 1.128 by jsr166, Wed Jan 27 01:57:24 2021 UTC

#	Line 28 | Line 28 | import java.util.concurrent.RejectedExec
28		import java.util.concurrent.RejectedExecutionHandler;
29		import java.util.concurrent.SynchronousQueue;
30		import java.util.concurrent.ThreadFactory;
31	+	import java.util.concurrent.ThreadLocalRandom;
32		import java.util.concurrent.ThreadPoolExecutor;
33	+	import java.util.concurrent.ThreadPoolExecutor.AbortPolicy;
34	+	import java.util.concurrent.ThreadPoolExecutor.CallerRunsPolicy;
35	+	import java.util.concurrent.ThreadPoolExecutor.DiscardPolicy;
36	+	import java.util.concurrent.ThreadPoolExecutor.DiscardOldestPolicy;
37		import java.util.concurrent.atomic.AtomicInteger;
38	+	import java.util.concurrent.atomic.AtomicReference;
39
40		import junit.framework.Test;
41		import junit.framework.TestSuite;
#	Line 284 | Line 290 | public class ThreadPoolExecutorTest exte
290		LONG_DELAY_MS, MILLISECONDS,
291		new ArrayBlockingQueue<Runnable>(10));
292		try (PoolCleaner cleaner = cleaner(p)) {
293	<	assertTrue(p.getRejectedExecutionHandler()
288	<	instanceof ThreadPoolExecutor.AbortPolicy);
293	>	assertTrue(p.getRejectedExecutionHandler() instanceof AbortPolicy);
294		}
295		}
296
#	Line 558 | Line 563 | public class ThreadPoolExecutorTest exte
563		q);
564		try (PoolCleaner cleaner = cleaner(p, done)) {
565		final CountDownLatch threadStarted = new CountDownLatch(1);
566	<	FutureTask[] tasks = new FutureTask[5];
566	>	FutureTask[] rtasks = new FutureTask[5];
567	>	@SuppressWarnings("unchecked")
568	>	FutureTask<Boolean>[] tasks = (FutureTask<Boolean>[])rtasks;
569		for (int i = 0; i < tasks.length; i++) {
570	<	Callable task = new CheckedCallable<Boolean>() {
570	>	Callable<Boolean> task = new CheckedCallable<>() {
571		public Boolean realCall() throws InterruptedException {
572		threadStarted.countDown();
573		assertSame(q, p.getQueue());
574		await(done);
575		return Boolean.TRUE;
576		}};
577	<	tasks[i] = new FutureTask(task);
577	>	tasks[i] = new FutureTask<>(task);
578		p.execute(tasks[i]);
579		}
580		await(threadStarted);
#	Line 624 | Line 631 | public class ThreadPoolExecutorTest exte
631		LONG_DELAY_MS, MILLISECONDS,
632		q);
633		try (PoolCleaner cleaner = cleaner(p, done)) {
634	<	FutureTask[] tasks = new FutureTask[5];
634	>	FutureTask[] rtasks = new FutureTask[5];
635	>	@SuppressWarnings("unchecked")
636	>	FutureTask<Boolean>[] tasks = (FutureTask<Boolean>[])rtasks;
637		for (int i = 0; i < tasks.length; i++) {
638	<	Callable task = new CheckedCallable<Boolean>() {
638	>	Callable<Boolean> task = new CheckedCallable<>() {
639		public Boolean realCall() throws InterruptedException {
640		threadStarted.countDown();
641		await(done);
642		return Boolean.TRUE;
643		}};
644	<	tasks[i] = new FutureTask(task);
644	>	tasks[i] = new FutureTask<>(task);
645		p.execute(tasks[i]);
646		}
647		await(threadStarted);
#	Line 667 | Line 676 | public class ThreadPoolExecutorTest exte
676		Runnable waiter = new CheckedRunnable() { public void realRun() {
677		threadsStarted.countDown();
678		try {
679	<	MILLISECONDS.sleep(2 * LONG_DELAY_MS);
679	>	MILLISECONDS.sleep(LONGER_DELAY_MS);
680		} catch (InterruptedException success) {}
681		ran.getAndIncrement();
682		}};
#	Line 754 | Line 763 | public class ThreadPoolExecutorTest exte
763		public void testConstructorNullPointerException() {
764		try {
765		new ThreadPoolExecutor(1, 2, 1L, SECONDS,
766	<	(BlockingQueue) null);
766	>	(BlockingQueue<Runnable>) null);
767		shouldThrow();
768		} catch (NullPointerException success) {}
769		}
#	Line 825 | Line 834 | public class ThreadPoolExecutorTest exte
834		public void testConstructorNullPointerException2() {
835		try {
836		new ThreadPoolExecutor(1, 2, 1L, SECONDS,
837	<	(BlockingQueue) null,
837	>	(BlockingQueue<Runnable>) null,
838		new SimpleThreadFactory());
839		shouldThrow();
840		} catch (NullPointerException success) {}
#	Line 909 | Line 918 | public class ThreadPoolExecutorTest exte
918		public void testConstructorNullPointerException4() {
919		try {
920		new ThreadPoolExecutor(1, 2, 1L, SECONDS,
921	<	(BlockingQueue) null,
921	>	(BlockingQueue<Runnable>) null,
922		new NoOpREHandler());
923		shouldThrow();
924		} catch (NullPointerException success) {}
#	Line 998 | Line 1007 | public class ThreadPoolExecutorTest exte
1007		public void testConstructorNullPointerException6() {
1008		try {
1009		new ThreadPoolExecutor(1, 2, 1L, SECONDS,
1010	<	(BlockingQueue) null,
1010	>	(BlockingQueue<Runnable>) null,
1011		new SimpleThreadFactory(),
1012		new NoOpREHandler());
1013		shouldThrow();
#	Line 1045 | Line 1054 | public class ThreadPoolExecutorTest exte
1054		final CountDownLatch threadStarted = new CountDownLatch(1);
1055		Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1056		public void realRun() throws Exception {
1057	<	Callable task = new CheckedCallable<Boolean>() {
1057	>	Callable<Boolean> task = new CheckedCallable<>() {
1058		public Boolean realCall() throws InterruptedException {
1059		threadStarted.countDown();
1060		await(done);
#	Line 1054 | Line 1063 | public class ThreadPoolExecutorTest exte
1063		p.submit(task).get();
1064		}});
1065
1066	<	await(threadStarted);
1066	>	await(threadStarted); // ensure quiescence
1067		t.interrupt();
1068		awaitTermination(t);
1069		}
1070		}
1071
1072		/**
1073	<	* execute throws RejectedExecutionException if saturated.
1073	>	* Submitted tasks are rejected when saturated or shutdown
1074		*/
1075	<	public void testSaturatedExecute() {
1075	>	public void testSubmittedTasksRejectedWhenSaturatedOrShutdown() throws InterruptedException {
1076	>	final ThreadPoolExecutor p = new ThreadPoolExecutor(
1077	>	1, 1, 1, SECONDS, new ArrayBlockingQueue<Runnable>(1));
1078	>	final int saturatedSize = saturatedSize(p);
1079	>	final ThreadLocalRandom rnd = ThreadLocalRandom.current();
1080	>	final CountDownLatch threadsStarted = new CountDownLatch(p.getMaximumPoolSize());
1081		final CountDownLatch done = new CountDownLatch(1);
1082	<	final ThreadPoolExecutor p =
1083	<	new ThreadPoolExecutor(1, 1,
1084	<	LONG_DELAY_MS, MILLISECONDS,
1071	<	new ArrayBlockingQueue<Runnable>(1));
1072	<	try (PoolCleaner cleaner = cleaner(p, done)) {
1073	<	Runnable task = new CheckedRunnable() {
1074	<	public void realRun() throws InterruptedException {
1075	<	await(done);
1076	<	}};
1077	<	for (int i = 0; i < 2; ++i)
1078	<	p.execute(task);
1079	<	for (int i = 0; i < 2; ++i) {
1082	>	final Runnable r = () -> {
1083	>	threadsStarted.countDown();
1084	>	for (;;) {
1085		try {
1086	<	p.execute(task);
1087	<	shouldThrow();
1088	<	} catch (RejectedExecutionException success) {}
1089	<	assertTrue(p.getTaskCount() <= 2);
1090	<	}
1091	<	}
1092	<	}
1088	<
1089	<	/**
1090	<	* submit(runnable) throws RejectedExecutionException if saturated.
1091	<	*/
1092	<	public void testSaturatedSubmitRunnable() {
1093	<	final CountDownLatch done = new CountDownLatch(1);
1094	<	final ThreadPoolExecutor p =
1095	<	new ThreadPoolExecutor(1, 1,
1096	<	LONG_DELAY_MS, MILLISECONDS,
1097	<	new ArrayBlockingQueue<Runnable>(1));
1098	<	try (PoolCleaner cleaner = cleaner(p, done)) {
1099	<	Runnable task = new CheckedRunnable() {
1100	<	public void realRun() throws InterruptedException {
1101	<	await(done);
1102	<	}};
1103	<	for (int i = 0; i < 2; ++i)
1104	<	p.submit(task);
1105	<	for (int i = 0; i < 2; ++i) {
1086	>	done.await();
1087	>	return;
1088	>	} catch (InterruptedException shutdownNowDeliberatelyIgnored) {}
1089	>	}};
1090	>	final Callable<Boolean> c = () -> {
1091	>	threadsStarted.countDown();
1092	>	for (;;) {
1093		try {
1094	<	p.execute(task);
1095	<	shouldThrow();
1096	<	} catch (RejectedExecutionException success) {}
1097	<	assertTrue(p.getTaskCount() <= 2);
1098	<	}
1112	<	}
1113	<	}
1094	>	done.await();
1095	>	return Boolean.TRUE;
1096	>	} catch (InterruptedException shutdownNowDeliberatelyIgnored) {}
1097	>	}};
1098	>	final boolean shutdownNow = rnd.nextBoolean();
1099
1115	–	/**
1116	–	* submit(callable) throws RejectedExecutionException if saturated.
1117	–	*/
1118	–	public void testSaturatedSubmitCallable() {
1119	–	final CountDownLatch done = new CountDownLatch(1);
1120	–	final ThreadPoolExecutor p =
1121	–	new ThreadPoolExecutor(1, 1,
1122	–	LONG_DELAY_MS, MILLISECONDS,
1123	–	new ArrayBlockingQueue<Runnable>(1));
1100		try (PoolCleaner cleaner = cleaner(p, done)) {
1101	<	Runnable task = new CheckedRunnable() {
1102	<	public void realRun() throws InterruptedException {
1103	<	await(done);
1104	<	}};
1105	<	for (int i = 0; i < 2; ++i)
1106	<	p.execute(task);
1107	<	for (int i = 0; i < 2; ++i) {
1108	<	try {
1133	<	p.execute(task);
1134	<	shouldThrow();
1135	<	} catch (RejectedExecutionException success) {}
1136	<	assertTrue(p.getTaskCount() <= 2);
1101	>	// saturate
1102	>	for (int i = saturatedSize; i--> 0; ) {
1103	>	switch (rnd.nextInt(4)) {
1104	>	case 0: p.execute(r); break;
1105	>	case 1: assertFalse(p.submit(r).isDone()); break;
1106	>	case 2: assertFalse(p.submit(r, Boolean.TRUE).isDone()); break;
1107	>	case 3: assertFalse(p.submit(c).isDone()); break;
1108	>	}
1109		}
1138	–	}
1139	–	}
1110
1111	<	/**
1112	<	* executor using CallerRunsPolicy runs task if saturated.
1143	<	*/
1144	<	public void testSaturatedExecute2() {
1145	<	final ThreadPoolExecutor p =
1146	<	new ThreadPoolExecutor(1, 1,
1147	<	LONG_DELAY_MS,
1148	<	MILLISECONDS,
1149	<	new ArrayBlockingQueue<Runnable>(1),
1150	<	new ThreadPoolExecutor.CallerRunsPolicy());
1151	<	try (PoolCleaner cleaner = cleaner(p)) {
1152	<	final CountDownLatch done = new CountDownLatch(1);
1153	<	Runnable blocker = new CheckedRunnable() {
1154	<	public void realRun() throws InterruptedException {
1155	<	await(done);
1156	<	}};
1157	<	p.execute(blocker);
1158	<	TrackedNoOpRunnable[] tasks = new TrackedNoOpRunnable[5];
1159	<	for (int i = 0; i < tasks.length; i++)
1160	<	tasks[i] = new TrackedNoOpRunnable();
1161	<	for (int i = 0; i < tasks.length; i++)
1162	<	p.execute(tasks[i]);
1163	<	for (int i = 1; i < tasks.length; i++)
1164	<	assertTrue(tasks[i].done);
1165	<	assertFalse(tasks[0].done); // waiting in queue
1166	<	done.countDown();
1167	<	}
1168	<	}
1111	>	await(threadsStarted);
1112	>	assertTaskSubmissionsAreRejected(p);
1113
1114	<	/**
1115	<	* executor using DiscardPolicy drops task if saturated.
1116	<	*/
1117	<	public void testSaturatedExecute3() {
1118	<	final CountDownLatch done = new CountDownLatch(1);
1119	<	final TrackedNoOpRunnable[] tasks = new TrackedNoOpRunnable[5];
1120	<	for (int i = 0; i < tasks.length; ++i)
1121	<	tasks[i] = new TrackedNoOpRunnable();
1122	<	final ThreadPoolExecutor p =
1123	<	new ThreadPoolExecutor(1, 1,
1180	<	LONG_DELAY_MS, MILLISECONDS,
1181	<	new ArrayBlockingQueue<Runnable>(1),
1182	<	new ThreadPoolExecutor.DiscardPolicy());
1183	<	try (PoolCleaner cleaner = cleaner(p, done)) {
1184	<	p.execute(awaiter(done));
1114	>	if (shutdownNow)
1115	>	p.shutdownNow();
1116	>	else
1117	>	p.shutdown();
1118	>	// Pool is shutdown, but not yet terminated
1119	>	assertTaskSubmissionsAreRejected(p);
1120	>	assertFalse(p.isTerminated());
1121	>
1122	>	done.countDown();   // release blocking tasks
1123	>	assertTrue(p.awaitTermination(LONG_DELAY_MS, MILLISECONDS));
1124
1125	<	for (TrackedNoOpRunnable task : tasks)
1126	<	p.execute(task);
1127	<	for (int i = 1; i < tasks.length; i++)
1128	<	assertFalse(tasks[i].done);
1129	<	}
1191	<	for (int i = 1; i < tasks.length; i++)
1192	<	assertFalse(tasks[i].done);
1193	<	assertTrue(tasks[0].done); // was waiting in queue
1125	>	assertTaskSubmissionsAreRejected(p);
1126	>	}
1127	>	assertEquals(saturatedSize(p)
1128	>	- (shutdownNow ? p.getQueue().remainingCapacity() : 0),
1129	>	p.getCompletedTaskCount());
1130		}
1131
1132		/**
1133		* executor using DiscardOldestPolicy drops oldest task if saturated.
1134		*/
1135	<	public void testSaturatedExecute4() {
1135	>	public void testSaturatedExecute_DiscardOldestPolicy() {
1136		final CountDownLatch done = new CountDownLatch(1);
1137		LatchAwaiter r1 = awaiter(done);
1138		LatchAwaiter r2 = awaiter(done);
#	Line 1205 | Line 1141 | public class ThreadPoolExecutorTest exte
1141		new ThreadPoolExecutor(1, 1,
1142		LONG_DELAY_MS, MILLISECONDS,
1143		new ArrayBlockingQueue<Runnable>(1),
1144	<	new ThreadPoolExecutor.DiscardOldestPolicy());
1144	>	new DiscardOldestPolicy());
1145		try (PoolCleaner cleaner = cleaner(p, done)) {
1146		assertEquals(LatchAwaiter.NEW, r1.state);
1147		assertEquals(LatchAwaiter.NEW, r2.state);
#	Line 1223 | Line 1159 | public class ThreadPoolExecutorTest exte
1159		}
1160
1161		/**
1226	–	* execute throws RejectedExecutionException if shutdown
1227	–	*/
1228	–	public void testRejectedExecutionExceptionOnShutdown() {
1229	–	final ThreadPoolExecutor p =
1230	–	new ThreadPoolExecutor(1, 1,
1231	–	LONG_DELAY_MS, MILLISECONDS,
1232	–	new ArrayBlockingQueue<Runnable>(1));
1233	–	try { p.shutdown(); } catch (SecurityException ok) { return; }
1234	–	try (PoolCleaner cleaner = cleaner(p)) {
1235	–	try {
1236	–	p.execute(new NoOpRunnable());
1237	–	shouldThrow();
1238	–	} catch (RejectedExecutionException success) {}
1239	–	}
1240	–	}
1241	–
1242	–	/**
1243	–	* execute using CallerRunsPolicy drops task on shutdown
1244	–	*/
1245	–	public void testCallerRunsOnShutdown() {
1246	–	RejectedExecutionHandler h = new ThreadPoolExecutor.CallerRunsPolicy();
1247	–	final ThreadPoolExecutor p =
1248	–	new ThreadPoolExecutor(1, 1,
1249	–	LONG_DELAY_MS, MILLISECONDS,
1250	–	new ArrayBlockingQueue<Runnable>(1), h);
1251	–
1252	–	try { p.shutdown(); } catch (SecurityException ok) { return; }
1253	–	try (PoolCleaner cleaner = cleaner(p)) {
1254	–	TrackedNoOpRunnable r = new TrackedNoOpRunnable();
1255	–	p.execute(r);
1256	–	assertFalse(r.done);
1257	–	}
1258	–	}
1259	–
1260	–	/**
1261	–	* execute using DiscardPolicy drops task on shutdown
1262	–	*/
1263	–	public void testDiscardOnShutdown() {
1264	–	final ThreadPoolExecutor p =
1265	–	new ThreadPoolExecutor(1, 1,
1266	–	LONG_DELAY_MS, MILLISECONDS,
1267	–	new ArrayBlockingQueue<Runnable>(1),
1268	–	new ThreadPoolExecutor.DiscardPolicy());
1269	–
1270	–	try { p.shutdown(); } catch (SecurityException ok) { return; }
1271	–	try (PoolCleaner cleaner = cleaner(p)) {
1272	–	TrackedNoOpRunnable r = new TrackedNoOpRunnable();
1273	–	p.execute(r);
1274	–	assertFalse(r.done);
1275	–	}
1276	–	}
1277	–
1278	–	/**
1162		* execute using DiscardOldestPolicy drops task on shutdown
1163		*/
1164		public void testDiscardOldestOnShutdown() {
#	Line 1283 | Line 1166 | public class ThreadPoolExecutorTest exte
1166		new ThreadPoolExecutor(1, 1,
1167		LONG_DELAY_MS, MILLISECONDS,
1168		new ArrayBlockingQueue<Runnable>(1),
1169	<	new ThreadPoolExecutor.DiscardOldestPolicy());
1169	>	new DiscardOldestPolicy());
1170
1171		try { p.shutdown(); } catch (SecurityException ok) { return; }
1172		try (PoolCleaner cleaner = cleaner(p)) {
#	Line 1294 | Line 1177 | public class ThreadPoolExecutorTest exte
1177		}
1178
1179		/**
1180	<	* execute(null) throws NPE
1180	>	* Submitting null tasks throws NullPointerException
1181		*/
1182	<	public void testExecuteNull() {
1182	>	public void testNullTaskSubmission() {
1183		final ThreadPoolExecutor p =
1184		new ThreadPoolExecutor(1, 2,
1185		1L, SECONDS,
1186		new ArrayBlockingQueue<Runnable>(10));
1187		try (PoolCleaner cleaner = cleaner(p)) {
1188	<	try {
1306	<	p.execute(null);
1307	<	shouldThrow();
1308	<	} catch (NullPointerException success) {}
1188	>	assertNullTaskSubmissionThrowsNullPointerException(p);
1189		}
1190		}
1191
#	Line 1894 | Line 1774 | public class ThreadPoolExecutorTest exte
1774		public void testTimedInvokeAll6() throws Exception {
1775		for (long timeout = timeoutMillis();;) {
1776		final CountDownLatch done = new CountDownLatch(1);
1777	<	final Callable<String> waiter = new CheckedCallable<String>() {
1777	>	final Callable<String> waiter = new CheckedCallable<>() {
1778		public String realCall() {
1779		try { done.await(LONG_DELAY_MS, MILLISECONDS); }
1780		catch (InterruptedException ok) {}
#	Line 1913 | Line 1793 | public class ThreadPoolExecutorTest exte
1793		p.invokeAll(tasks, timeout, MILLISECONDS);
1794		assertEquals(tasks.size(), futures.size());
1795		assertTrue(millisElapsedSince(startTime) >= timeout);
1796	<	for (Future future : futures)
1796	>	for (Future<?> future : futures)
1797		assertTrue(future.isDone());
1798		assertTrue(futures.get(1).isCancelled());
1799		try {
#	Line 2028 | Line 1908 | public class ThreadPoolExecutorTest exte
1908		final ThreadPoolExecutor p =
1909		new ThreadPoolExecutor(1, 30,
1910		60, SECONDS,
1911	<	new ArrayBlockingQueue(30));
1911	>	new ArrayBlockingQueue<Runnable>(30));
1912		try (PoolCleaner cleaner = cleaner(p)) {
1913		for (int i = 0; i < nTasks; ++i) {
1914		for (;;) {
#	Line 2081 | Line 1961 | public class ThreadPoolExecutorTest exte
1961		}
1962		}
1963
1964	<	public void testAbortPolicy() {
1965	<	final RejectedExecutionHandler handler =
2086	<	new ThreadPoolExecutor.AbortPolicy();
1964	>	/** Directly test simple ThreadPoolExecutor RejectedExecutionHandlers. */
1965	>	public void testStandardRejectedExecutionHandlers() {
1966		final ThreadPoolExecutor p =
1967	<	new ThreadPoolExecutor(1, 1,
1968	<	LONG_DELAY_MS, MILLISECONDS,
1969	<	new ArrayBlockingQueue<Runnable>(10));
1970	<	final TrackedNoOpRunnable r = new TrackedNoOpRunnable();
1967	>	new ThreadPoolExecutor(1, 1, 1, SECONDS,
1968	>	new ArrayBlockingQueue<Runnable>(1));
1969	>	final AtomicReference<Thread> thread = new AtomicReference<>();
1970	>	final Runnable r = new Runnable() { public void run() {
1971	>	thread.set(Thread.currentThread()); }};
1972	>
1973		try {
1974	<	handler.rejectedExecution(r, p);
1974	>	new AbortPolicy().rejectedExecution(r, p);
1975		shouldThrow();
1976		} catch (RejectedExecutionException success) {}
1977	<	assertFalse(r.done);
1977	>	assertNull(thread.get());
1978	>
1979	>	new DiscardPolicy().rejectedExecution(r, p);
1980	>	assertNull(thread.get());
1981	>
1982	>	new CallerRunsPolicy().rejectedExecution(r, p);
1983	>	assertSame(Thread.currentThread(), thread.get());
1984	>
1985	>	// check that pool was not perturbed by handlers
1986	>	assertTrue(p.getRejectedExecutionHandler() instanceof AbortPolicy);
1987		assertEquals(0, p.getTaskCount());
1988		assertTrue(p.getQueue().isEmpty());
1989		}
1990
1991	+	public void testThreadFactoryReturnsTerminatedThread_shouldThrow() {
1992	+	if (!testImplementationDetails)
1993	+	return;
1994	+
1995	+	ThreadFactory returnsTerminatedThread = runnableIgnored -> {
1996	+	Thread thread = new Thread(() -> {});
1997	+	thread.start();
1998	+	try { thread.join(); }
1999	+	catch (InterruptedException ex) { throw new Error(ex); }
2000	+	return thread;
2001	+	};
2002	+	ThreadPoolExecutor p =
2003	+	new ThreadPoolExecutor(1, 1, 1, SECONDS,
2004	+	new ArrayBlockingQueue<Runnable>(1),
2005	+	returnsTerminatedThread);
2006	+	try (PoolCleaner cleaner = cleaner(p)) {
2007	+	assertThrows(IllegalThreadStateException.class,
2008	+	() -> p.execute(() -> {}));
2009	+	}
2010	+	}
2011	+
2012	+	public void testThreadFactoryReturnsStartedThread_shouldThrow() {
2013	+	if (!testImplementationDetails)
2014	+	return;
2015	+
2016	+	CountDownLatch latch = new CountDownLatch(1);
2017	+	Runnable awaitLatch = () -> {
2018	+	try { latch.await(); }
2019	+	catch (InterruptedException ex) { throw new Error(ex); }};
2020	+	ThreadFactory returnsStartedThread = runnable -> {
2021	+	Thread thread = new Thread(awaitLatch);
2022	+	thread.start();
2023	+	return thread;
2024	+	};
2025	+	ThreadPoolExecutor p =
2026	+	new ThreadPoolExecutor(1, 1, 1, SECONDS,
2027	+	new ArrayBlockingQueue<Runnable>(1),
2028	+	returnsStartedThread);
2029	+	try (PoolCleaner cleaner = cleaner(p)) {
2030	+	assertThrows(IllegalThreadStateException.class,
2031	+	() -> p.execute(() -> {}));
2032	+	latch.countDown();
2033	+	}
2034	+	}
2035	+
2036		}

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