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Comparing jsr166/src/test/tck/AbstractQueuedSynchronizerTest.java (file contents):
Revision 1.12 by dl, Fri Jan 9 14:45:58 2004 UTC vs.
Revision 1.47 by jsr166, Wed Dec 31 19:05:42 2014 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
5	<	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	<	* Pat Fisher, Mike Judd.
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9	+	import static java.util.concurrent.TimeUnit.MILLISECONDS;
10	+	import static java.util.concurrent.TimeUnit.NANOSECONDS;
11
12	<	import junit.framework.*;
13	<	import java.util.*;
14	<	import java.util.concurrent.*;
15	<	import java.util.concurrent.locks.*;
16	<	import java.io.*;
12	>	import java.util.Arrays;
13	>	import java.util.Collection;
14	>	import java.util.HashSet;
15	>	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
16	>	import java.util.concurrent.locks.AbstractQueuedSynchronizer.ConditionObject;
17	>
18	>	import junit.framework.AssertionFailedError;
19	>	import junit.framework.Test;
20	>	import junit.framework.TestSuite;
21
22		public class AbstractQueuedSynchronizerTest extends JSR166TestCase {
23		public static void main(String[] args) {
24	<	junit.textui.TestRunner.run (suite());
24	>	junit.textui.TestRunner.run(suite());
25		}
26		public static Test suite() {
27		return new TestSuite(AbstractQueuedSynchronizerTest.class);
28		}
29
30		/**
31	<	* A simple mutex class, adapted from the
32	<	* AbstractQueuedSynchronizer javadoc.  Exclusive acquire tests
33	<	* exercise this as a sample user extension.  Other
34	<	* methods/features of AbstractQueuedSynchronizerTest are tested
35	<	* via other test classes, including those for ReentrantLock,
30	<	* ReentrantReadWriteLock, and Semaphore
31	>	* A simple mutex class, adapted from the class javadoc.  Exclusive
32	>	* acquire tests exercise this as a sample user extension.  Other
33	>	* methods/features of AbstractQueuedSynchronizer are tested via
34	>	* other test classes, including those for ReentrantLock,
35	>	* ReentrantReadWriteLock, and Semaphore.
36		*/
37		static class Mutex extends AbstractQueuedSynchronizer {
38	<	public boolean isLocked() { return getState() == 1; }
39	<
40	<	public boolean tryAcquireExclusive(int acquires) {
41	<	assertTrue(acquires == 1);
42	<	return compareAndSetState(0, 1);
43	<	}
44	<
45	<	public boolean tryReleaseExclusive(int releases) {
46	<	setState(0);
38	>	/** An eccentric value for locked synchronizer state. */
39	>	static final int LOCKED = (1 << 31) | (1 << 15);
40	>
41	>	static final int UNLOCKED = 0;
42	>
43	>	@Override public boolean isHeldExclusively() {
44	>	int state = getState();
45	>	assertTrue(state == UNLOCKED || state == LOCKED);
46	>	return state == LOCKED;
47	>	}
48	>
49	>	@Override public boolean tryAcquire(int acquires) {
50	>	assertEquals(LOCKED, acquires);
51	>	return compareAndSetState(UNLOCKED, LOCKED);
52	>	}
53	>
54	>	@Override public boolean tryRelease(int releases) {
55	>	if (getState() != LOCKED) throw new IllegalMonitorStateException();
56	>	assertEquals(LOCKED, releases);
57	>	setState(UNLOCKED);
58		return true;
59		}
60	<
61	<	public void checkConditionAccess(Thread thread) {
62	<	if (getState() == 0) throw new IllegalMonitorStateException();
60	>
61	>	public boolean tryAcquireNanos(long nanos) throws InterruptedException {
62	>	return tryAcquireNanos(LOCKED, nanos);
63	>	}
64	>
65	>	public boolean tryAcquire() {
66	>	return tryAcquire(LOCKED);
67	>	}
68	>
69	>	public boolean tryRelease() {
70	>	return tryRelease(LOCKED);
71	>	}
72	>
73	>	public void acquire() {
74	>	acquire(LOCKED);
75	>	}
76	>
77	>	public void acquireInterruptibly() throws InterruptedException {
78	>	acquireInterruptibly(LOCKED);
79		}
80	<
81	<	public ConditionObject newCondition() { return new ConditionObject(); }
82	<
51	<	public void lock() {
52	<	acquireExclusiveUninterruptibly(1);
80	>
81	>	public void release() {
82	>	release(LOCKED);
83		}
84
85	+	public ConditionObject newCondition() {
86	+	return new ConditionObject();
87	+	}
88		}
89
57	–
90		/**
91		* A simple latch class, to test shared mode.
92		*/
93	<	static class BooleanLatch extends AbstractQueuedSynchronizer {
93	>	static class BooleanLatch extends AbstractQueuedSynchronizer {
94		public boolean isSignalled() { return getState() != 0; }
95
96		public int tryAcquireShared(int ignore) {
97	<	return isSignalled()? 1 : -1;
97	>	return isSignalled() ? 1 : -1;
98		}
99	<
99	>
100		public boolean tryReleaseShared(int ignore) {
101		setState(1);
102		return true;
#	Line 72 | Line 104 | public class AbstractQueuedSynchronizerT
104		}
105
106		/**
107	<	* A runnable calling acquireExclusiveInterruptibly
107	>	* A runnable calling acquireInterruptibly that does not expect to
108	>	* be interrupted.
109		*/
110	<	class InterruptibleLockRunnable implements Runnable {
111	<	final Mutex lock;
112	<	InterruptibleLockRunnable(Mutex l) { lock = l; }
113	<	public void run() {
114	<	try {
82	<	lock.acquireExclusiveInterruptibly(1);
83	<	} catch(InterruptedException success){}
110	>	class InterruptibleSyncRunnable extends CheckedRunnable {
111	>	final Mutex sync;
112	>	InterruptibleSyncRunnable(Mutex sync) { this.sync = sync; }
113	>	public void realRun() throws InterruptedException {
114	>	sync.acquireInterruptibly();
115		}
116		}
117
118	+	/**
119	+	* A runnable calling acquireInterruptibly that expects to be
120	+	* interrupted.
121	+	*/
122	+	class InterruptedSyncRunnable extends CheckedInterruptedRunnable {
123	+	final Mutex sync;
124	+	InterruptedSyncRunnable(Mutex sync) { this.sync = sync; }
125	+	public void realRun() throws InterruptedException {
126	+	sync.acquireInterruptibly();
127	+	}
128	+	}
129	+
130	+	/** A constant to clarify calls to checking methods below. */
131	+	static final Thread[] NO_THREADS = new Thread[0];
132
133		/**
134	<	* A runnable calling acquireExclusiveInterruptibly that expects to be
90	<	* interrupted
134	>	* Spin-waits until sync.isQueued(t) becomes true.
135		*/
136	<	class InterruptedLockRunnable implements Runnable {
137	<	final Mutex lock;
138	<	InterruptedLockRunnable(Mutex l) { lock = l; }
139	<	public void run() {
140	<	try {
141	<	lock.acquireExclusiveInterruptibly(1);
98	<	threadShouldThrow();
99	<	} catch(InterruptedException success){}
136	>	void waitForQueuedThread(AbstractQueuedSynchronizer sync, Thread t) {
137	>	long startTime = System.nanoTime();
138	>	while (!sync.isQueued(t)) {
139	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
140	>	throw new AssertionFailedError("timed out");
141	>	Thread.yield();
142		}
143	+	assertTrue(t.isAlive());
144		}
145	<
145	>
146		/**
147	<	* acquireExclusiveUninterruptiblying an releaseExclusiveed lock succeeds
147	>	* Checks that sync has exactly the given queued threads.
148		*/
149	<	public void testAcquireExclusiveUninterruptibly() {
150	<	Mutex rl = new Mutex();
151	<	rl.acquireExclusiveUninterruptibly(1);
152	<	assertTrue(rl.isLocked());
153	<	rl.releaseExclusive(1);
149	>	void assertHasQueuedThreads(AbstractQueuedSynchronizer sync,
150	>	Thread... expected) {
151	>	Collection<Thread> actual = sync.getQueuedThreads();
152	>	assertEquals(expected.length > 0, sync.hasQueuedThreads());
153	>	assertEquals(expected.length, sync.getQueueLength());
154	>	assertEquals(expected.length, actual.size());
155	>	assertEquals(expected.length == 0, actual.isEmpty());
156	>	assertEquals(new HashSet<Thread>(actual),
157	>	new HashSet<Thread>(Arrays.asList(expected)));
158		}
159
160		/**
161	<	* tryAcquireExclusive on an releaseExclusiveed lock succeeds
161	>	* Checks that sync has exactly the given (exclusive) queued threads.
162		*/
163	<	public void testTryAcquireExclusive() {
164	<	Mutex rl = new Mutex();
165	<	assertTrue(rl.tryAcquireExclusive(1));
166	<	assertTrue(rl.isLocked());
167	<	rl.releaseExclusive(1);
163	>	void assertHasExclusiveQueuedThreads(AbstractQueuedSynchronizer sync,
164	>	Thread... expected) {
165	>	assertHasQueuedThreads(sync, expected);
166	>	assertEquals(new HashSet<Thread>(sync.getExclusiveQueuedThreads()),
167	>	new HashSet<Thread>(sync.getQueuedThreads()));
168	>	assertEquals(0, sync.getSharedQueuedThreads().size());
169	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
170		}
171
172		/**
173	<	* hasQueuedThreads reports whether there are waiting threads
173	>	* Checks that sync has exactly the given (shared) queued threads.
174		*/
175	<	public void testhasQueuedThreads() {
176	<	final Mutex lock = new Mutex();
177	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
178	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
179	<	try {
180	<	assertFalse(lock.hasQueuedThreads());
181	<	lock.acquireExclusiveUninterruptibly(1);
182	<	t1.start();
134	<	Thread.sleep(SHORT_DELAY_MS);
135	<	assertTrue(lock.hasQueuedThreads());
136	<	t2.start();
137	<	Thread.sleep(SHORT_DELAY_MS);
138	<	assertTrue(lock.hasQueuedThreads());
139	<	t1.interrupt();
140	<	Thread.sleep(SHORT_DELAY_MS);
141	<	assertTrue(lock.hasQueuedThreads());
142	<	lock.releaseExclusive(1);
143	<	Thread.sleep(SHORT_DELAY_MS);
144	<	assertFalse(lock.hasQueuedThreads());
145	<	t1.join();
146	<	t2.join();
147	<	} catch(Exception e){
148	<	unexpectedException();
149	<	}
150	<	}
151	<
152	<	/**
153	<	* isQueued(null) throws NPE
154	<	*/
155	<	public void testIsQueuedNPE() {
156	<	final Mutex lock = new Mutex();
157	<	try {
158	<	lock.isQueued(null);
159	<	shouldThrow();
160	<	} catch (NullPointerException success) {
161	<	}
162	<	}
163	<
164	<	/**
165	<	* isQueued reports whether a thread is queued.
166	<	*/
167	<	public void testIsQueued() {
168	<	final Mutex lock = new Mutex();
169	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
170	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
171	<	try {
172	<	assertFalse(lock.isQueued(t1));
173	<	assertFalse(lock.isQueued(t2));
174	<	lock.acquireExclusiveUninterruptibly(1);
175	<	t1.start();
176	<	Thread.sleep(SHORT_DELAY_MS);
177	<	assertTrue(lock.isQueued(t1));
178	<	t2.start();
179	<	Thread.sleep(SHORT_DELAY_MS);
180	<	assertTrue(lock.isQueued(t1));
181	<	assertTrue(lock.isQueued(t2));
182	<	t1.interrupt();
183	<	Thread.sleep(SHORT_DELAY_MS);
184	<	assertFalse(lock.isQueued(t1));
185	<	assertTrue(lock.isQueued(t2));
186	<	lock.releaseExclusive(1);
187	<	Thread.sleep(SHORT_DELAY_MS);
188	<	assertFalse(lock.isQueued(t1));
189	<	assertFalse(lock.isQueued(t2));
190	<	t1.join();
191	<	t2.join();
192	<	} catch(Exception e){
193	<	unexpectedException();
194	<	}
195	<	}
196	<
197	<	/**
198	<	* getFirstQueuedThread returns first waiting thread or null is none
199	<	*/
200	<	public void testGetFirstQueuedThread() {
201	<	final Mutex lock = new Mutex();
202	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
203	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
204	<	try {
205	<	assertNull(lock.getFirstQueuedThread());
206	<	lock.acquireExclusiveUninterruptibly(1);
207	<	t1.start();
208	<	Thread.sleep(SHORT_DELAY_MS);
209	<	assertEquals(t1, lock.getFirstQueuedThread());
210	<	t2.start();
211	<	Thread.sleep(SHORT_DELAY_MS);
212	<	assertEquals(t1, lock.getFirstQueuedThread());
213	<	t1.interrupt();
214	<	Thread.sleep(SHORT_DELAY_MS);
215	<	assertEquals(t2, lock.getFirstQueuedThread());
216	<	lock.releaseExclusive(1);
217	<	Thread.sleep(SHORT_DELAY_MS);
218	<	assertNull(lock.getFirstQueuedThread());
219	<	t1.join();
220	<	t2.join();
221	<	} catch(Exception e){
222	<	unexpectedException();
223	<	}
224	<	}
175	>	void assertHasSharedQueuedThreads(AbstractQueuedSynchronizer sync,
176	>	Thread... expected) {
177	>	assertHasQueuedThreads(sync, expected);
178	>	assertEquals(new HashSet<Thread>(sync.getSharedQueuedThreads()),
179	>	new HashSet<Thread>(sync.getQueuedThreads()));
180	>	assertEquals(0, sync.getExclusiveQueuedThreads().size());
181	>	assertTrue(sync.getExclusiveQueuedThreads().isEmpty());
182	>	}
183
184	+	/**
185	+	* Checks that condition c has exactly the given waiter threads,
186	+	* after acquiring mutex.
187	+	*/
188	+	void assertHasWaitersUnlocked(Mutex sync, ConditionObject c,
189	+	Thread... threads) {
190	+	sync.acquire();
191	+	assertHasWaitersLocked(sync, c, threads);
192	+	sync.release();
193	+	}
194
195		/**
196	<	* hasContended reports false if no thread has ever blocked, else true
196	>	* Checks that condition c has exactly the given waiter threads.
197		*/
198	<	public void testHasContended() {
199	<	final Mutex lock = new Mutex();
200	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
201	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
202	<	try {
203	<	assertFalse(lock.hasContended());
204	<	lock.acquireExclusiveUninterruptibly(1);
205	<	t1.start();
238	<	Thread.sleep(SHORT_DELAY_MS);
239	<	assertTrue(lock.hasContended());
240	<	t2.start();
241	<	Thread.sleep(SHORT_DELAY_MS);
242	<	assertTrue(lock.hasContended());
243	<	t1.interrupt();
244	<	Thread.sleep(SHORT_DELAY_MS);
245	<	assertTrue(lock.hasContended());
246	<	lock.releaseExclusive(1);
247	<	Thread.sleep(SHORT_DELAY_MS);
248	<	assertTrue(lock.hasContended());
249	<	t1.join();
250	<	t2.join();
251	<	} catch(Exception e){
252	<	unexpectedException();
253	<	}
254	<	}
255	<
256	<	/**
257	<	* timed tryAcquireExclusive is interruptible.
258	<	*/
259	<	public void testInterruptedException2() {
260	<	final Mutex lock = new Mutex();
261	<	lock.acquireExclusiveUninterruptibly(1);
262	<	Thread t = new Thread(new Runnable() {
263	<	public void run() {
264	<	try {
265	<	lock.acquireExclusiveNanos(1, MEDIUM_DELAY_MS * 1000 * 1000);
266	<	threadShouldThrow();
267	<	} catch(InterruptedException success){}
268	<	}
269	<	});
270	<	try {
271	<	t.start();
272	<	t.interrupt();
273	<	} catch(Exception e){
274	<	unexpectedException();
275	<	}
198	>	void assertHasWaitersLocked(Mutex sync, ConditionObject c,
199	>	Thread... threads) {
200	>	assertEquals(threads.length > 0, sync.hasWaiters(c));
201	>	assertEquals(threads.length, sync.getWaitQueueLength(c));
202	>	assertEquals(threads.length == 0, sync.getWaitingThreads(c).isEmpty());
203	>	assertEquals(threads.length, sync.getWaitingThreads(c).size());
204	>	assertEquals(new HashSet<Thread>(sync.getWaitingThreads(c)),
205	>	new HashSet<Thread>(Arrays.asList(threads)));
206		}
207
208	+	enum AwaitMethod { await, awaitTimed, awaitNanos, awaitUntil }
209
210		/**
211	<	* TryAcquireExclusive on a locked lock fails
212	<	*/
213	<	public void testTryAcquireExclusiveWhenLocked() {
214	<	final Mutex lock = new Mutex();
215	<	lock.acquireExclusiveUninterruptibly(1);
216	<	Thread t = new Thread(new Runnable() {
217	<	public void run() {
218	<	threadAssertFalse(lock.tryAcquireExclusive(1));
219	<	}
220	<	});
221	<	try {
222	<	t.start();
223	<	t.join();
224	<	lock.releaseExclusive(1);
225	<	} catch(Exception e){
226	<	unexpectedException();
227	<	}
228	<	}
229	<
230	<	/**
300	<	* acquireExclusiveTimed on a locked lock times out
301	<	*/
302	<	public void testacquireExclusiveTimed_Timeout() {
303	<	final Mutex lock = new Mutex();
304	<	lock.acquireExclusiveUninterruptibly(1);
305	<	Thread t = new Thread(new Runnable() {
306	<	public void run() {
307	<	try {
308	<	threadAssertFalse(lock.acquireExclusiveNanos(1, 1000 * 1000));
309	<	} catch (Exception ex) {
310	<	threadUnexpectedException();
311	<	}
312	<	}
313	<	});
314	<	try {
315	<	t.start();
316	<	t.join();
317	<	lock.releaseExclusive(1);
318	<	} catch(Exception e){
319	<	unexpectedException();
320	<	}
321	<	}
322	<
323	<
324	<	/**
325	<	* isLocked is true when locked and false when not
326	<	*/
327	<	public void testIsLocked() {
328	<	final Mutex lock = new Mutex();
329	<	lock.acquireExclusiveUninterruptibly(1);
330	<	assertTrue(lock.isLocked());
331	<	lock.releaseExclusive(1);
332	<	assertFalse(lock.isLocked());
333	<	Thread t = new Thread(new Runnable() {
334	<	public void run() {
335	<	lock.acquireExclusiveUninterruptibly(1);
336	<	try {
337	<	Thread.sleep(SMALL_DELAY_MS);
338	<	}
339	<	catch(Exception e) {
340	<	threadUnexpectedException();
341	<	}
342	<	lock.releaseExclusive(1);
343	<	}
344	<	});
345	<	try {
346	<	t.start();
347	<	Thread.sleep(SHORT_DELAY_MS);
348	<	assertTrue(lock.isLocked());
349	<	t.join();
350	<	assertFalse(lock.isLocked());
351	<	} catch(Exception e){
352	<	unexpectedException();
211	>	* Awaits condition using the specified AwaitMethod.
212	>	*/
213	>	void await(ConditionObject c, AwaitMethod awaitMethod)
214	>	throws InterruptedException {
215	>	long timeoutMillis = 2 * LONG_DELAY_MS;
216	>	switch (awaitMethod) {
217	>	case await:
218	>	c.await();
219	>	break;
220	>	case awaitTimed:
221	>	assertTrue(c.await(timeoutMillis, MILLISECONDS));
222	>	break;
223	>	case awaitNanos:
224	>	long nanosTimeout = MILLISECONDS.toNanos(timeoutMillis);
225	>	long nanosRemaining = c.awaitNanos(nanosTimeout);
226	>	assertTrue(nanosRemaining > 0);
227	>	break;
228	>	case awaitUntil:
229	>	assertTrue(c.awaitUntil(delayedDate(timeoutMillis)));
230	>	break;
231		}
232		}
233
234	+	/**
235	+	* Checks that awaiting the given condition times out (using the
236	+	* default timeout duration).
237	+	*/
238	+	void assertAwaitTimesOut(ConditionObject c, AwaitMethod awaitMethod) {
239	+	long timeoutMillis = timeoutMillis();
240	+	long startTime = System.nanoTime();
241	+	try {
242	+	switch (awaitMethod) {
243	+	case awaitTimed:
244	+	assertFalse(c.await(timeoutMillis, MILLISECONDS));
245	+	break;
246	+	case awaitNanos:
247	+	long nanosTimeout = MILLISECONDS.toNanos(timeoutMillis);
248	+	long nanosRemaining = c.awaitNanos(nanosTimeout);
249	+	assertTrue(nanosRemaining <= 0);
250	+	break;
251	+	case awaitUntil:
252	+	assertFalse(c.awaitUntil(delayedDate(timeoutMillis)));
253	+	break;
254	+	default:
255	+	throw new UnsupportedOperationException();
256	+	}
257	+	} catch (InterruptedException ie) { threadUnexpectedException(ie); }
258	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
259	+	}
260
261		/**
262	<	* acquireExclusiveInterruptibly is interruptible.
263	<	*/
264	<	public void testAcquireInterruptibly1() {
265	<	final Mutex lock = new Mutex();
266	<	lock.acquireExclusiveUninterruptibly(1);
363	<	Thread t = new Thread(new InterruptedLockRunnable(lock));
364	<	try {
365	<	t.start();
366	<	t.interrupt();
367	<	lock.releaseExclusive(1);
368	<	t.join();
369	<	} catch(Exception e){
370	<	unexpectedException();
371	<	}
372	<	}
373	<
374	<	/**
375	<	* acquireExclusiveInterruptibly succeeds when released, else is interruptible
376	<	*/
377	<	public void testAcquireInterruptibly2() {
378	<	final Mutex lock = new Mutex();
379	<	try {
380	<	lock.acquireExclusiveInterruptibly(1);
381	<	} catch(Exception e) {
382	<	unexpectedException();
383	<	}
384	<	Thread t = new Thread(new InterruptedLockRunnable(lock));
385	<	try {
386	<	t.start();
387	<	t.interrupt();
388	<	assertTrue(lock.isLocked());
389	<	t.join();
390	<	} catch(Exception e){
391	<	unexpectedException();
392	<	}
262	>	* isHeldExclusively is false upon construction
263	>	*/
264	>	public void testIsHeldExclusively() {
265	>	Mutex sync = new Mutex();
266	>	assertFalse(sync.isHeldExclusively());
267		}
268
269		/**
270	<	* owns is true for a condition created by lock else false
270	>	* acquiring released sync succeeds
271		*/
272	<	public void testOwns() {
273	<	final Mutex lock = new Mutex();
274	<	final AbstractQueuedSynchronizer.ConditionObject c = lock.newCondition();
275	<	final Mutex lock2 = new Mutex();
276	<	assertTrue(lock.owns(c));
277	<	assertFalse(lock2.owns(c));
272	>	public void testAcquire() {
273	>	Mutex sync = new Mutex();
274	>	sync.acquire();
275	>	assertTrue(sync.isHeldExclusively());
276	>	sync.release();
277	>	assertFalse(sync.isHeldExclusively());
278	>	}
279	>
280	>	/**
281	>	* tryAcquire on a released sync succeeds
282	>	*/
283	>	public void testTryAcquire() {
284	>	Mutex sync = new Mutex();
285	>	assertTrue(sync.tryAcquire());
286	>	assertTrue(sync.isHeldExclusively());
287	>	sync.release();
288	>	assertFalse(sync.isHeldExclusively());
289		}
290
291		/**
292	<	* Calling await without holding lock throws IllegalMonitorStateException
292	>	* hasQueuedThreads reports whether there are waiting threads
293		*/
294	<	public void testAwait_IllegalMonitor() {
295	<	final Mutex lock = new Mutex();
296	<	final Condition c = lock.newCondition();
294	>	public void testHasQueuedThreads() {
295	>	final Mutex sync = new Mutex();
296	>	assertFalse(sync.hasQueuedThreads());
297	>	sync.acquire();
298	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
299	>	waitForQueuedThread(sync, t1);
300	>	assertTrue(sync.hasQueuedThreads());
301	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
302	>	waitForQueuedThread(sync, t2);
303	>	assertTrue(sync.hasQueuedThreads());
304	>	t1.interrupt();
305	>	awaitTermination(t1);
306	>	assertTrue(sync.hasQueuedThreads());
307	>	sync.release();
308	>	awaitTermination(t2);
309	>	assertFalse(sync.hasQueuedThreads());
310	>	}
311	>
312	>	/**
313	>	* isQueued(null) throws NullPointerException
314	>	*/
315	>	public void testIsQueuedNPE() {
316	>	final Mutex sync = new Mutex();
317		try {
318	<	c.await();
318	>	sync.isQueued(null);
319		shouldThrow();
320	<	}
321	<	catch (IllegalMonitorStateException success) {
322	<	}
323	<	catch (Exception ex) {
324	<	unexpectedException();
320	>	} catch (NullPointerException success) {}
321	>	}
322	>
323	>	/**
324	>	* isQueued reports whether a thread is queued
325	>	*/
326	>	public void testIsQueued() {
327	>	final Mutex sync = new Mutex();
328	>	Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
329	>	Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
330	>	assertFalse(sync.isQueued(t1));
331	>	assertFalse(sync.isQueued(t2));
332	>	sync.acquire();
333	>	t1.start();
334	>	waitForQueuedThread(sync, t1);
335	>	assertTrue(sync.isQueued(t1));
336	>	assertFalse(sync.isQueued(t2));
337	>	t2.start();
338	>	waitForQueuedThread(sync, t2);
339	>	assertTrue(sync.isQueued(t1));
340	>	assertTrue(sync.isQueued(t2));
341	>	t1.interrupt();
342	>	awaitTermination(t1);
343	>	assertFalse(sync.isQueued(t1));
344	>	assertTrue(sync.isQueued(t2));
345	>	sync.release();
346	>	awaitTermination(t2);
347	>	assertFalse(sync.isQueued(t1));
348	>	assertFalse(sync.isQueued(t2));
349	>	}
350	>
351	>	/**
352	>	* getFirstQueuedThread returns first waiting thread or null if none
353	>	*/
354	>	public void testGetFirstQueuedThread() {
355	>	final Mutex sync = new Mutex();
356	>	assertNull(sync.getFirstQueuedThread());
357	>	sync.acquire();
358	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
359	>	waitForQueuedThread(sync, t1);
360	>	assertEquals(t1, sync.getFirstQueuedThread());
361	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
362	>	waitForQueuedThread(sync, t2);
363	>	assertEquals(t1, sync.getFirstQueuedThread());
364	>	t1.interrupt();
365	>	awaitTermination(t1);
366	>	assertEquals(t2, sync.getFirstQueuedThread());
367	>	sync.release();
368	>	awaitTermination(t2);
369	>	assertNull(sync.getFirstQueuedThread());
370	>	}
371	>
372	>	/**
373	>	* hasContended reports false if no thread has ever blocked, else true
374	>	*/
375	>	public void testHasContended() {
376	>	final Mutex sync = new Mutex();
377	>	assertFalse(sync.hasContended());
378	>	sync.acquire();
379	>	assertFalse(sync.hasContended());
380	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
381	>	waitForQueuedThread(sync, t1);
382	>	assertTrue(sync.hasContended());
383	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
384	>	waitForQueuedThread(sync, t2);
385	>	assertTrue(sync.hasContended());
386	>	t1.interrupt();
387	>	awaitTermination(t1);
388	>	assertTrue(sync.hasContended());
389	>	sync.release();
390	>	awaitTermination(t2);
391	>	assertTrue(sync.hasContended());
392	>	}
393	>
394	>	/**
395	>	* getQueuedThreads returns all waiting threads
396	>	*/
397	>	public void testGetQueuedThreads() {
398	>	final Mutex sync = new Mutex();
399	>	Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
400	>	Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
401	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
402	>	sync.acquire();
403	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
404	>	t1.start();
405	>	waitForQueuedThread(sync, t1);
406	>	assertHasExclusiveQueuedThreads(sync, t1);
407	>	assertTrue(sync.getQueuedThreads().contains(t1));
408	>	assertFalse(sync.getQueuedThreads().contains(t2));
409	>	t2.start();
410	>	waitForQueuedThread(sync, t2);
411	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
412	>	assertTrue(sync.getQueuedThreads().contains(t1));
413	>	assertTrue(sync.getQueuedThreads().contains(t2));
414	>	t1.interrupt();
415	>	awaitTermination(t1);
416	>	assertHasExclusiveQueuedThreads(sync, t2);
417	>	sync.release();
418	>	awaitTermination(t2);
419	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
420	>	}
421	>
422	>	/**
423	>	* getExclusiveQueuedThreads returns all exclusive waiting threads
424	>	*/
425	>	public void testGetExclusiveQueuedThreads() {
426	>	final Mutex sync = new Mutex();
427	>	Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
428	>	Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
429	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
430	>	sync.acquire();
431	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
432	>	t1.start();
433	>	waitForQueuedThread(sync, t1);
434	>	assertHasExclusiveQueuedThreads(sync, t1);
435	>	assertTrue(sync.getExclusiveQueuedThreads().contains(t1));
436	>	assertFalse(sync.getExclusiveQueuedThreads().contains(t2));
437	>	t2.start();
438	>	waitForQueuedThread(sync, t2);
439	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
440	>	assertTrue(sync.getExclusiveQueuedThreads().contains(t1));
441	>	assertTrue(sync.getExclusiveQueuedThreads().contains(t2));
442	>	t1.interrupt();
443	>	awaitTermination(t1);
444	>	assertHasExclusiveQueuedThreads(sync, t2);
445	>	sync.release();
446	>	awaitTermination(t2);
447	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
448	>	}
449	>
450	>	/**
451	>	* getSharedQueuedThreads does not include exclusively waiting threads
452	>	*/
453	>	public void testGetSharedQueuedThreads_Exclusive() {
454	>	final Mutex sync = new Mutex();
455	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
456	>	sync.acquire();
457	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
458	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
459	>	waitForQueuedThread(sync, t1);
460	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
461	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
462	>	waitForQueuedThread(sync, t2);
463	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
464	>	t1.interrupt();
465	>	awaitTermination(t1);
466	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
467	>	sync.release();
468	>	awaitTermination(t2);
469	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
470	>	}
471	>
472	>	/**
473	>	* getSharedQueuedThreads returns all shared waiting threads
474	>	*/
475	>	public void testGetSharedQueuedThreads_Shared() {
476	>	final BooleanLatch l = new BooleanLatch();
477	>	assertHasSharedQueuedThreads(l, NO_THREADS);
478	>	Thread t1 = newStartedThread(new CheckedInterruptedRunnable() {
479	>	public void realRun() throws InterruptedException {
480	>	l.acquireSharedInterruptibly(0);
481	>	}});
482	>	waitForQueuedThread(l, t1);
483	>	assertHasSharedQueuedThreads(l, t1);
484	>	Thread t2 = newStartedThread(new CheckedRunnable() {
485	>	public void realRun() throws InterruptedException {
486	>	l.acquireSharedInterruptibly(0);
487	>	}});
488	>	waitForQueuedThread(l, t2);
489	>	assertHasSharedQueuedThreads(l, t1, t2);
490	>	t1.interrupt();
491	>	awaitTermination(t1);
492	>	assertHasSharedQueuedThreads(l, t2);
493	>	assertTrue(l.releaseShared(0));
494	>	awaitTermination(t2);
495	>	assertHasSharedQueuedThreads(l, NO_THREADS);
496	>	}
497	>
498	>	/**
499	>	* tryAcquireNanos is interruptible
500	>	*/
501	>	public void testTryAcquireNanos_Interruptible() {
502	>	final Mutex sync = new Mutex();
503	>	sync.acquire();
504	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
505	>	public void realRun() throws InterruptedException {
506	>	sync.tryAcquireNanos(MILLISECONDS.toNanos(2 * LONG_DELAY_MS));
507	>	}});
508	>
509	>	waitForQueuedThread(sync, t);
510	>	t.interrupt();
511	>	awaitTermination(t);
512	>	}
513	>
514	>	/**
515	>	* tryAcquire on exclusively held sync fails
516	>	*/
517	>	public void testTryAcquireWhenSynced() {
518	>	final Mutex sync = new Mutex();
519	>	sync.acquire();
520	>	Thread t = newStartedThread(new CheckedRunnable() {
521	>	public void realRun() {
522	>	assertFalse(sync.tryAcquire());
523	>	}});
524	>
525	>	awaitTermination(t);
526	>	sync.release();
527	>	}
528	>
529	>	/**
530	>	* tryAcquireNanos on an exclusively held sync times out
531	>	*/
532	>	public void testAcquireNanos_Timeout() {
533	>	final Mutex sync = new Mutex();
534	>	sync.acquire();
535	>	Thread t = newStartedThread(new CheckedRunnable() {
536	>	public void realRun() throws InterruptedException {
537	>	long startTime = System.nanoTime();
538	>	long nanos = MILLISECONDS.toNanos(timeoutMillis());
539	>	assertFalse(sync.tryAcquireNanos(nanos));
540	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
541	>	}});
542	>
543	>	awaitTermination(t);
544	>	sync.release();
545	>	}
546	>
547	>	/**
548	>	* getState is true when acquired and false when not
549	>	*/
550	>	public void testGetState() {
551	>	final Mutex sync = new Mutex();
552	>	sync.acquire();
553	>	assertTrue(sync.isHeldExclusively());
554	>	sync.release();
555	>	assertFalse(sync.isHeldExclusively());
556	>
557	>	final BooleanLatch acquired = new BooleanLatch();
558	>	final BooleanLatch done = new BooleanLatch();
559	>	Thread t = newStartedThread(new CheckedRunnable() {
560	>	public void realRun() throws InterruptedException {
561	>	sync.acquire();
562	>	assertTrue(acquired.releaseShared(0));
563	>	done.acquireShared(0);
564	>	sync.release();
565	>	}});
566	>
567	>	acquired.acquireShared(0);
568	>	assertTrue(sync.isHeldExclusively());
569	>	assertTrue(done.releaseShared(0));
570	>	awaitTermination(t);
571	>	assertFalse(sync.isHeldExclusively());
572	>	}
573	>
574	>	/**
575	>	* acquireInterruptibly succeeds when released, else is interruptible
576	>	*/
577	>	public void testAcquireInterruptibly() throws InterruptedException {
578	>	final Mutex sync = new Mutex();
579	>	final BooleanLatch threadStarted = new BooleanLatch();
580	>	sync.acquireInterruptibly();
581	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
582	>	public void realRun() throws InterruptedException {
583	>	assertTrue(threadStarted.releaseShared(0));
584	>	sync.acquireInterruptibly();
585	>	}});
586	>
587	>	threadStarted.acquireShared(0);
588	>	waitForQueuedThread(sync, t);
589	>	t.interrupt();
590	>	awaitTermination(t);
591	>	assertTrue(sync.isHeldExclusively());
592	>	}
593	>
594	>	/**
595	>	* owns is true for a condition created by sync else false
596	>	*/
597	>	public void testOwns() {
598	>	final Mutex sync = new Mutex();
599	>	final ConditionObject c = sync.newCondition();
600	>	final Mutex sync2 = new Mutex();
601	>	assertTrue(sync.owns(c));
602	>	assertFalse(sync2.owns(c));
603	>	}
604	>
605	>	/**
606	>	* Calling await without holding sync throws IllegalMonitorStateException
607	>	*/
608	>	public void testAwait_IMSE() {
609	>	final Mutex sync = new Mutex();
610	>	final ConditionObject c = sync.newCondition();
611	>	for (AwaitMethod awaitMethod : AwaitMethod.values()) {
612	>	long startTime = System.nanoTime();
613	>	try {
614	>	await(c, awaitMethod);
615	>	shouldThrow();
616	>	} catch (IllegalMonitorStateException success) {
617	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
618	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
619		}
620		}
621
622		/**
623	<	* Calling signal without holding lock throws IllegalMonitorStateException
623	>	* Calling signal without holding sync throws IllegalMonitorStateException
624		*/
625	<	public void testSignal_IllegalMonitor() {
626	<	final Mutex lock = new Mutex();
627	<	final Condition c = lock.newCondition();
625	>	public void testSignal_IMSE() {
626	>	final Mutex sync = new Mutex();
627	>	final ConditionObject c = sync.newCondition();
628		try {
629		c.signal();
630		shouldThrow();
631	<	}
632	<	catch (IllegalMonitorStateException success) {
434	<	}
435	<	catch (Exception ex) {
436	<	unexpectedException();
437	<	}
631	>	} catch (IllegalMonitorStateException success) {}
632	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
633		}
634
635		/**
636	<	* awaitNanos without a signal times out
636	>	* Calling signalAll without holding sync throws IllegalMonitorStateException
637		*/
638	<	public void testAwaitNanos_Timeout() {
639	<	final Mutex lock = new Mutex();
640	<	final Condition c = lock.newCondition();
638	>	public void testSignalAll_IMSE() {
639	>	final Mutex sync = new Mutex();
640	>	final ConditionObject c = sync.newCondition();
641		try {
642	<	lock.acquireExclusiveUninterruptibly(1);
643	<	long t = c.awaitNanos(100);
644	<	assertTrue(t <= 0);
450	<	lock.releaseExclusive(1);
451	<	}
452	<	catch (Exception ex) {
453	<	unexpectedException();
454	<	}
642	>	c.signalAll();
643	>	shouldThrow();
644	>	} catch (IllegalMonitorStateException success) {}
645		}
646
647		/**
648	<	*  timed await without a signal times out
648	>	* await/awaitNanos/awaitUntil without a signal times out
649		*/
650	<	public void testAwait_Timeout() {
651	<	final Mutex lock = new Mutex();
652	<	final Condition c = lock.newCondition();
650	>	public void testAwaitTimed_Timeout() { testAwait_Timeout(AwaitMethod.awaitTimed); }
651	>	public void testAwaitNanos_Timeout() { testAwait_Timeout(AwaitMethod.awaitNanos); }
652	>	public void testAwaitUntil_Timeout() { testAwait_Timeout(AwaitMethod.awaitUntil); }
653	>	public void testAwait_Timeout(AwaitMethod awaitMethod) {
654	>	final Mutex sync = new Mutex();
655	>	final ConditionObject c = sync.newCondition();
656	>	sync.acquire();
657	>	assertAwaitTimesOut(c, awaitMethod);
658	>	sync.release();
659	>	}
660	>
661	>	/**
662	>	* await/awaitNanos/awaitUntil returns when signalled
663	>	*/
664	>	public void testSignal_await()      { testSignal(AwaitMethod.await); }
665	>	public void testSignal_awaitTimed() { testSignal(AwaitMethod.awaitTimed); }
666	>	public void testSignal_awaitNanos() { testSignal(AwaitMethod.awaitNanos); }
667	>	public void testSignal_awaitUntil() { testSignal(AwaitMethod.awaitUntil); }
668	>	public void testSignal(final AwaitMethod awaitMethod) {
669	>	final Mutex sync = new Mutex();
670	>	final ConditionObject c = sync.newCondition();
671	>	final BooleanLatch acquired = new BooleanLatch();
672	>	Thread t = newStartedThread(new CheckedRunnable() {
673	>	public void realRun() throws InterruptedException {
674	>	sync.acquire();
675	>	assertTrue(acquired.releaseShared(0));
676	>	await(c, awaitMethod);
677	>	sync.release();
678	>	}});
679	>
680	>	acquired.acquireShared(0);
681	>	sync.acquire();
682	>	assertHasWaitersLocked(sync, c, t);
683	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
684	>	c.signal();
685	>	assertHasWaitersLocked(sync, c, NO_THREADS);
686	>	assertHasExclusiveQueuedThreads(sync, t);
687	>	sync.release();
688	>	awaitTermination(t);
689	>	}
690	>
691	>	/**
692	>	* hasWaiters(null) throws NullPointerException
693	>	*/
694	>	public void testHasWaitersNPE() {
695	>	final Mutex sync = new Mutex();
696		try {
697	<	lock.acquireExclusiveUninterruptibly(1);
698	<	assertFalse(c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
699	<	lock.releaseExclusive(1);
467	<	}
468	<	catch (Exception ex) {
469	<	unexpectedException();
470	<	}
697	>	sync.hasWaiters(null);
698	>	shouldThrow();
699	>	} catch (NullPointerException success) {}
700		}
701
702		/**
703	<	* awaitUntil without a signal times out
703	>	* getWaitQueueLength(null) throws NullPointerException
704		*/
705	<	public void testAwaitUntil_Timeout() {
706	<	final Mutex lock = new Mutex();
478	<	final Condition c = lock.newCondition();
705	>	public void testGetWaitQueueLengthNPE() {
706	>	final Mutex sync = new Mutex();
707		try {
708	<	lock.acquireExclusiveUninterruptibly(1);
709	<	java.util.Date d = new java.util.Date();
710	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
483	<	lock.releaseExclusive(1);
484	<	}
485	<	catch (Exception ex) {
486	<	unexpectedException();
487	<	}
708	>	sync.getWaitQueueLength(null);
709	>	shouldThrow();
710	>	} catch (NullPointerException success) {}
711		}
712
713		/**
714	<	* await returns when signalled
714	>	* getWaitingThreads(null) throws NullPointerException
715		*/
716	<	public void testAwait() {
717	<	final Mutex lock = new Mutex();
718	<	final Condition c = lock.newCondition();
719	<	Thread t = new Thread(new Runnable() {
720	<	public void run() {
721	<	try {
722	<	lock.acquireExclusiveUninterruptibly(1);
500	<	c.await();
501	<	lock.releaseExclusive(1);
502	<	}
503	<	catch(InterruptedException e) {
504	<	threadUnexpectedException();
505	<	}
506	<	}
507	<	});
716	>	public void testGetWaitingThreadsNPE() {
717	>	final Mutex sync = new Mutex();
718	>	try {
719	>	sync.getWaitingThreads(null);
720	>	shouldThrow();
721	>	} catch (NullPointerException success) {}
722	>	}
723
724	+	/**
725	+	* hasWaiters throws IllegalArgumentException if not owned
726	+	*/
727	+	public void testHasWaitersIAE() {
728	+	final Mutex sync = new Mutex();
729	+	final ConditionObject c = sync.newCondition();
730	+	final Mutex sync2 = new Mutex();
731		try {
732	<	t.start();
733	<	Thread.sleep(SHORT_DELAY_MS);
734	<	lock.acquireExclusiveUninterruptibly(1);
735	<	c.signal();
736	<	lock.releaseExclusive(1);
737	<	t.join(SHORT_DELAY_MS);
738	<	assertFalse(t.isAlive());
739	<	}
740	<	catch (Exception ex) {
741	<	unexpectedException();
742	<	}
732	>	sync2.hasWaiters(c);
733	>	shouldThrow();
734	>	} catch (IllegalArgumentException success) {}
735	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
736	>	}
737	>
738	>	/**
739	>	* hasWaiters throws IllegalMonitorStateException if not synced
740	>	*/
741	>	public void testHasWaitersIMSE() {
742	>	final Mutex sync = new Mutex();
743	>	final ConditionObject c = sync.newCondition();
744	>	try {
745	>	sync.hasWaiters(c);
746	>	shouldThrow();
747	>	} catch (IllegalMonitorStateException success) {}
748	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
749	>	}
750	>
751	>	/**
752	>	* getWaitQueueLength throws IllegalArgumentException if not owned
753	>	*/
754	>	public void testGetWaitQueueLengthIAE() {
755	>	final Mutex sync = new Mutex();
756	>	final ConditionObject c = sync.newCondition();
757	>	final Mutex sync2 = new Mutex();
758	>	try {
759	>	sync2.getWaitQueueLength(c);
760	>	shouldThrow();
761	>	} catch (IllegalArgumentException success) {}
762	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
763	>	}
764	>
765	>	/**
766	>	* getWaitQueueLength throws IllegalMonitorStateException if not synced
767	>	*/
768	>	public void testGetWaitQueueLengthIMSE() {
769	>	final Mutex sync = new Mutex();
770	>	final ConditionObject c = sync.newCondition();
771	>	try {
772	>	sync.getWaitQueueLength(c);
773	>	shouldThrow();
774	>	} catch (IllegalMonitorStateException success) {}
775	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
776	>	}
777	>
778	>	/**
779	>	* getWaitingThreads throws IllegalArgumentException if not owned
780	>	*/
781	>	public void testGetWaitingThreadsIAE() {
782	>	final Mutex sync = new Mutex();
783	>	final ConditionObject c = sync.newCondition();
784	>	final Mutex sync2 = new Mutex();
785	>	try {
786	>	sync2.getWaitingThreads(c);
787	>	shouldThrow();
788	>	} catch (IllegalArgumentException success) {}
789	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
790		}
791
792	+	/**
793	+	* getWaitingThreads throws IllegalMonitorStateException if not synced
794	+	*/
795	+	public void testGetWaitingThreadsIMSE() {
796	+	final Mutex sync = new Mutex();
797	+	final ConditionObject c = sync.newCondition();
798	+	try {
799	+	sync.getWaitingThreads(c);
800	+	shouldThrow();
801	+	} catch (IllegalMonitorStateException success) {}
802	+	assertHasWaitersUnlocked(sync, c, NO_THREADS);
803	+	}
804	+
805	+	/**
806	+	* hasWaiters returns true when a thread is waiting, else false
807	+	*/
808	+	public void testHasWaiters() {
809	+	final Mutex sync = new Mutex();
810	+	final ConditionObject c = sync.newCondition();
811	+	final BooleanLatch acquired = new BooleanLatch();
812	+	Thread t = newStartedThread(new CheckedRunnable() {
813	+	public void realRun() throws InterruptedException {
814	+	sync.acquire();
815	+	assertHasWaitersLocked(sync, c, NO_THREADS);
816	+	assertFalse(sync.hasWaiters(c));
817	+	assertTrue(acquired.releaseShared(0));
818	+	c.await();
819	+	sync.release();
820	+	}});
821	+
822	+	acquired.acquireShared(0);
823	+	sync.acquire();
824	+	assertHasWaitersLocked(sync, c, t);
825	+	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
826	+	assertTrue(sync.hasWaiters(c));
827	+	c.signal();
828	+	assertHasWaitersLocked(sync, c, NO_THREADS);
829	+	assertHasExclusiveQueuedThreads(sync, t);
830	+	assertFalse(sync.hasWaiters(c));
831	+	sync.release();
832	+
833	+	awaitTermination(t);
834	+	assertHasWaitersUnlocked(sync, c, NO_THREADS);
835	+	}
836	+
837	+	/**
838	+	* getWaitQueueLength returns number of waiting threads
839	+	*/
840	+	public void testGetWaitQueueLength() {
841	+	final Mutex sync = new Mutex();
842	+	final ConditionObject c = sync.newCondition();
843	+	final BooleanLatch acquired1 = new BooleanLatch();
844	+	final BooleanLatch acquired2 = new BooleanLatch();
845	+	final Thread t1 = newStartedThread(new CheckedRunnable() {
846	+	public void realRun() throws InterruptedException {
847	+	sync.acquire();
848	+	assertHasWaitersLocked(sync, c, NO_THREADS);
849	+	assertEquals(0, sync.getWaitQueueLength(c));
850	+	assertTrue(acquired1.releaseShared(0));
851	+	c.await();
852	+	sync.release();
853	+	}});
854	+	acquired1.acquireShared(0);
855	+	sync.acquire();
856	+	assertHasWaitersLocked(sync, c, t1);
857	+	assertEquals(1, sync.getWaitQueueLength(c));
858	+	sync.release();
859	+
860	+	final Thread t2 = newStartedThread(new CheckedRunnable() {
861	+	public void realRun() throws InterruptedException {
862	+	sync.acquire();
863	+	assertHasWaitersLocked(sync, c, t1);
864	+	assertEquals(1, sync.getWaitQueueLength(c));
865	+	assertTrue(acquired2.releaseShared(0));
866	+	c.await();
867	+	sync.release();
868	+	}});
869	+	acquired2.acquireShared(0);
870	+	sync.acquire();
871	+	assertHasWaitersLocked(sync, c, t1, t2);
872	+	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
873	+	assertEquals(2, sync.getWaitQueueLength(c));
874	+	c.signalAll();
875	+	assertHasWaitersLocked(sync, c, NO_THREADS);
876	+	assertHasExclusiveQueuedThreads(sync, t1, t2);
877	+	assertEquals(0, sync.getWaitQueueLength(c));
878	+	sync.release();
879	+
880	+	awaitTermination(t1);
881	+	awaitTermination(t2);
882	+	assertHasWaitersUnlocked(sync, c, NO_THREADS);
883	+	}
884	+
885	+	/**
886	+	* getWaitingThreads returns only and all waiting threads
887	+	*/
888	+	public void testGetWaitingThreads() {
889	+	final Mutex sync = new Mutex();
890	+	final ConditionObject c = sync.newCondition();
891	+	final BooleanLatch acquired1 = new BooleanLatch();
892	+	final BooleanLatch acquired2 = new BooleanLatch();
893	+	final Thread t1 = new Thread(new CheckedRunnable() {
894	+	public void realRun() throws InterruptedException {
895	+	sync.acquire();
896	+	assertHasWaitersLocked(sync, c, NO_THREADS);
897	+	assertTrue(sync.getWaitingThreads(c).isEmpty());
898	+	assertTrue(acquired1.releaseShared(0));
899	+	c.await();
900	+	sync.release();
901	+	}});
902	+
903	+	final Thread t2 = new Thread(new CheckedRunnable() {
904	+	public void realRun() throws InterruptedException {
905	+	sync.acquire();
906	+	assertHasWaitersLocked(sync, c, t1);
907	+	assertTrue(sync.getWaitingThreads(c).contains(t1));
908	+	assertFalse(sync.getWaitingThreads(c).isEmpty());
909	+	assertEquals(1, sync.getWaitingThreads(c).size());
910	+	assertTrue(acquired2.releaseShared(0));
911	+	c.await();
912	+	sync.release();
913	+	}});
914	+
915	+	sync.acquire();
916	+	assertHasWaitersLocked(sync, c, NO_THREADS);
917	+	assertFalse(sync.getWaitingThreads(c).contains(t1));
918	+	assertFalse(sync.getWaitingThreads(c).contains(t2));
919	+	assertTrue(sync.getWaitingThreads(c).isEmpty());
920	+	assertEquals(0, sync.getWaitingThreads(c).size());
921	+	sync.release();
922	+
923	+	t1.start();
924	+	acquired1.acquireShared(0);
925	+	sync.acquire();
926	+	assertHasWaitersLocked(sync, c, t1);
927	+	assertTrue(sync.getWaitingThreads(c).contains(t1));
928	+	assertFalse(sync.getWaitingThreads(c).contains(t2));
929	+	assertFalse(sync.getWaitingThreads(c).isEmpty());
930	+	assertEquals(1, sync.getWaitingThreads(c).size());
931	+	sync.release();
932	+
933	+	t2.start();
934	+	acquired2.acquireShared(0);
935	+	sync.acquire();
936	+	assertHasWaitersLocked(sync, c, t1, t2);
937	+	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
938	+	assertTrue(sync.getWaitingThreads(c).contains(t1));
939	+	assertTrue(sync.getWaitingThreads(c).contains(t2));
940	+	assertFalse(sync.getWaitingThreads(c).isEmpty());
941	+	assertEquals(2, sync.getWaitingThreads(c).size());
942	+	c.signalAll();
943	+	assertHasWaitersLocked(sync, c, NO_THREADS);
944	+	assertHasExclusiveQueuedThreads(sync, t1, t2);
945	+	assertFalse(sync.getWaitingThreads(c).contains(t1));
946	+	assertFalse(sync.getWaitingThreads(c).contains(t2));
947	+	assertTrue(sync.getWaitingThreads(c).isEmpty());
948	+	assertEquals(0, sync.getWaitingThreads(c).size());
949	+	sync.release();
950	+
951	+	awaitTermination(t1);
952	+	awaitTermination(t2);
953	+	assertHasWaitersUnlocked(sync, c, NO_THREADS);
954	+	}
955	+
956	+	/**
957	+	* awaitUninterruptibly is uninterruptible
958	+	*/
959	+	public void testAwaitUninterruptibly() {
960	+	final Mutex sync = new Mutex();
961	+	final ConditionObject c = sync.newCondition();
962	+	final BooleanLatch pleaseInterrupt = new BooleanLatch();
963	+	Thread t = newStartedThread(new CheckedRunnable() {
964	+	public void realRun() {
965	+	sync.acquire();
966	+	assertTrue(pleaseInterrupt.releaseShared(0));
967	+	c.awaitUninterruptibly();
968	+	assertTrue(Thread.interrupted());
969	+	assertHasWaitersLocked(sync, c, NO_THREADS);
970	+	sync.release();
971	+	}});
972	+
973	+	pleaseInterrupt.acquireShared(0);
974	+	sync.acquire();
975	+	assertHasWaitersLocked(sync, c, t);
976	+	sync.release();
977	+	t.interrupt();
978	+	assertHasWaitersUnlocked(sync, c, t);
979	+	assertThreadStaysAlive(t);
980	+	sync.acquire();
981	+	assertHasWaitersLocked(sync, c, t);
982	+	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
983	+	c.signal();
984	+	assertHasWaitersLocked(sync, c, NO_THREADS);
985	+	assertHasExclusiveQueuedThreads(sync, t);
986	+	sync.release();
987	+	awaitTermination(t);
988	+	}
989	+
990	+	/**
991	+	* await/awaitNanos/awaitUntil is interruptible
992	+	*/
993	+	public void testInterruptible_await()      { testInterruptible(AwaitMethod.await); }
994	+	public void testInterruptible_awaitTimed() { testInterruptible(AwaitMethod.awaitTimed); }
995	+	public void testInterruptible_awaitNanos() { testInterruptible(AwaitMethod.awaitNanos); }
996	+	public void testInterruptible_awaitUntil() { testInterruptible(AwaitMethod.awaitUntil); }
997	+	public void testInterruptible(final AwaitMethod awaitMethod) {
998	+	final Mutex sync = new Mutex();
999	+	final ConditionObject c = sync.newCondition();
1000	+	final BooleanLatch pleaseInterrupt = new BooleanLatch();
1001	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1002	+	public void realRun() throws InterruptedException {
1003	+	sync.acquire();
1004	+	assertTrue(pleaseInterrupt.releaseShared(0));
1005	+	await(c, awaitMethod);
1006	+	}});
1007	+
1008	+	pleaseInterrupt.acquireShared(0);
1009	+	t.interrupt();
1010	+	awaitTermination(t);
1011	+	}
1012	+
1013	+	/**
1014	+	* signalAll wakes up all threads
1015	+	*/
1016	+	public void testSignalAll_await()      { testSignalAll(AwaitMethod.await); }
1017	+	public void testSignalAll_awaitTimed() { testSignalAll(AwaitMethod.awaitTimed); }
1018	+	public void testSignalAll_awaitNanos() { testSignalAll(AwaitMethod.awaitNanos); }
1019	+	public void testSignalAll_awaitUntil() { testSignalAll(AwaitMethod.awaitUntil); }
1020	+	public void testSignalAll(final AwaitMethod awaitMethod) {
1021	+	final Mutex sync = new Mutex();
1022	+	final ConditionObject c = sync.newCondition();
1023	+	final BooleanLatch acquired1 = new BooleanLatch();
1024	+	final BooleanLatch acquired2 = new BooleanLatch();
1025	+	Thread t1 = newStartedThread(new CheckedRunnable() {
1026	+	public void realRun() throws InterruptedException {
1027	+	sync.acquire();
1028	+	acquired1.releaseShared(0);
1029	+	await(c, awaitMethod);
1030	+	sync.release();
1031	+	}});
1032	+
1033	+	Thread t2 = newStartedThread(new CheckedRunnable() {
1034	+	public void realRun() throws InterruptedException {
1035	+	sync.acquire();
1036	+	acquired2.releaseShared(0);
1037	+	await(c, awaitMethod);
1038	+	sync.release();
1039	+	}});
1040	+
1041	+	acquired1.acquireShared(0);
1042	+	acquired2.acquireShared(0);
1043	+	sync.acquire();
1044	+	assertHasWaitersLocked(sync, c, t1, t2);
1045	+	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
1046	+	c.signalAll();
1047	+	assertHasWaitersLocked(sync, c, NO_THREADS);
1048	+	assertHasExclusiveQueuedThreads(sync, t1, t2);
1049	+	sync.release();
1050	+	awaitTermination(t1);
1051	+	awaitTermination(t2);
1052	+	}
1053	+
1054	+	/**
1055	+	* toString indicates current state
1056	+	*/
1057	+	public void testToString() {
1058	+	Mutex sync = new Mutex();
1059	+	assertTrue(sync.toString().contains("State = " + Mutex.UNLOCKED));
1060	+	sync.acquire();
1061	+	assertTrue(sync.toString().contains("State = " + Mutex.LOCKED));
1062	+	}
1063	+
1064	+	/**
1065	+	* A serialized AQS deserializes with current state, but no queued threads
1066	+	*/
1067	+	public void testSerialization() {
1068	+	Mutex sync = new Mutex();
1069	+	assertFalse(serialClone(sync).isHeldExclusively());
1070	+	sync.acquire();
1071	+	Thread t = newStartedThread(new InterruptedSyncRunnable(sync));
1072	+	waitForQueuedThread(sync, t);
1073	+	assertTrue(sync.isHeldExclusively());
1074	+
1075	+	Mutex clone = serialClone(sync);
1076	+	assertTrue(clone.isHeldExclusively());
1077	+	assertHasExclusiveQueuedThreads(sync, t);
1078	+	assertHasExclusiveQueuedThreads(clone, NO_THREADS);
1079	+	t.interrupt();
1080	+	awaitTermination(t);
1081	+	sync.release();
1082	+	assertFalse(sync.isHeldExclusively());
1083	+	assertTrue(clone.isHeldExclusively());
1084	+	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
1085	+	assertHasExclusiveQueuedThreads(clone, NO_THREADS);
1086	+	}
1087
1088		/**
1089	<	* Latch isSignalled initially returns false, then true after release
1089	>	* tryReleaseShared setting state changes getState
1090		*/
1091	<	public void testLatchIsSignalled() {
1092	<	final BooleanLatch l = new BooleanLatch();
1093	<	assertFalse(l.isSignalled());
1094	<	l.releaseShared(0);
1095	<	assertTrue(l.isSignalled());
1091	>	public void testGetStateWithReleaseShared() {
1092	>	final BooleanLatch l = new BooleanLatch();
1093	>	assertFalse(l.isSignalled());
1094	>	assertTrue(l.releaseShared(0));
1095	>	assertTrue(l.isSignalled());
1096		}
1097
1098		/**
1099	<	* release and has no effect when already signalled
1099	>	* releaseShared has no effect when already signalled
1100		*/
1101	<	public void testLatchBoolean() {
1102	<	final BooleanLatch l = new BooleanLatch();
1103	<	assertFalse(l.isSignalled());
1104	<	l.releaseShared(0);
1105	<	assertTrue(l.isSignalled());
1106	<	l.releaseShared(0);
1107	<	assertTrue(l.isSignalled());
1101	>	public void testReleaseShared() {
1102	>	final BooleanLatch l = new BooleanLatch();
1103	>	assertFalse(l.isSignalled());
1104	>	assertTrue(l.releaseShared(0));
1105	>	assertTrue(l.isSignalled());
1106	>	assertTrue(l.releaseShared(0));
1107	>	assertTrue(l.isSignalled());
1108		}
1109
1110		/**
1111		* acquireSharedInterruptibly returns after release, but not before
1112		*/
1113	<	public void testLatchAcquireSharedInterruptibly() {
1114	<	final BooleanLatch l = new BooleanLatch();
1113	>	public void testAcquireSharedInterruptibly() {
1114	>	final BooleanLatch l = new BooleanLatch();
1115
1116	<	Thread t = new Thread(new Runnable() {
1117	<	public void run() {
1118	<	try {
1119	<	threadAssertFalse(l.isSignalled());
1120	<	l.acquireSharedInterruptibly(0);
1121	<	threadAssertTrue(l.isSignalled());
1122	<	} catch(InterruptedException e){
1123	<	threadUnexpectedException();
1124	<	}
1125	<	}
1126	<	});
1127	<	try {
1128	<	t.start();
1129	<	assertFalse(l.isSignalled());
1130	<	Thread.sleep(SHORT_DELAY_MS);
1131	<	l.releaseShared(0);
568	<	assertTrue(l.isSignalled());
569	<	t.join();
570	<	} catch (InterruptedException e){
571	<	unexpectedException();
572	<	}
573	<	}
574	<
575	<
576	<	/**
577	<	* acquireSharedTimed returns after release
578	<	*/
579	<	public void testLatchTimedacquireSharedInterruptibly() {
580	<	final BooleanLatch l = new BooleanLatch();
581	<
582	<	Thread t = new Thread(new Runnable() {
583	<	public void run() {
584	<	try {
585	<	threadAssertFalse(l.isSignalled());
586	<	threadAssertTrue(l.acquireSharedNanos(0, MEDIUM_DELAY_MS* 1000 * 1000));
587	<	threadAssertTrue(l.isSignalled());
588	<
589	<	} catch(InterruptedException e){
590	<	threadUnexpectedException();
591	<	}
592	<	}
593	<	});
594	<	try {
595	<	t.start();
596	<	assertFalse(l.isSignalled());
597	<	Thread.sleep(SHORT_DELAY_MS);
598	<	l.releaseShared(0);
599	<	assertTrue(l.isSignalled());
600	<	t.join();
601	<	} catch (InterruptedException e){
602	<	unexpectedException();
603	<	}
1116	>	Thread t = newStartedThread(new CheckedRunnable() {
1117	>	public void realRun() throws InterruptedException {
1118	>	assertFalse(l.isSignalled());
1119	>	l.acquireSharedInterruptibly(0);
1120	>	assertTrue(l.isSignalled());
1121	>	l.acquireSharedInterruptibly(0);
1122	>	assertTrue(l.isSignalled());
1123	>	}});
1124	>
1125	>	waitForQueuedThread(l, t);
1126	>	assertFalse(l.isSignalled());
1127	>	assertThreadStaysAlive(t);
1128	>	assertHasSharedQueuedThreads(l, t);
1129	>	assertTrue(l.releaseShared(0));
1130	>	assertTrue(l.isSignalled());
1131	>	awaitTermination(t);
1132		}
1133	<
1133	>
1134		/**
1135	<	* acquireSharedInterruptibly throws IE if interrupted before released
1135	>	* tryAcquireSharedNanos returns after release, but not before
1136		*/
1137	<	public void testLatchAcquireSharedInterruptibly_InterruptedException() {
1137	>	public void testTryAcquireSharedNanos() {
1138		final BooleanLatch l = new BooleanLatch();
1139	<	Thread t = new Thread(new Runnable() {
1140	<	public void run() {
1141	<	try {
1142	<	threadAssertFalse(l.isSignalled());
1143	<	l.acquireSharedInterruptibly(0);
1144	<	threadShouldThrow();
1145	<	} catch(InterruptedException success){}
1146	<	}
1147	<	});
1148	<	t.start();
1149	<	try {
1150	<	assertFalse(l.isSignalled());
1151	<	t.interrupt();
1152	<	t.join();
1153	<	} catch (InterruptedException e){
1154	<	unexpectedException();
1155	<	}
1139	>
1140	>	Thread t = newStartedThread(new CheckedRunnable() {
1141	>	public void realRun() throws InterruptedException {
1142	>	assertFalse(l.isSignalled());
1143	>	long nanos = MILLISECONDS.toNanos(2 * LONG_DELAY_MS);
1144	>	assertTrue(l.tryAcquireSharedNanos(0, nanos));
1145	>	assertTrue(l.isSignalled());
1146	>	assertTrue(l.tryAcquireSharedNanos(0, nanos));
1147	>	assertTrue(l.isSignalled());
1148	>	}});
1149	>
1150	>	waitForQueuedThread(l, t);
1151	>	assertFalse(l.isSignalled());
1152	>	assertThreadStaysAlive(t);
1153	>	assertTrue(l.releaseShared(0));
1154	>	assertTrue(l.isSignalled());
1155	>	awaitTermination(t);
1156		}
1157
1158		/**
1159	<	* acquireSharedTimed throws IE if interrupted before released
1159	>	* acquireSharedInterruptibly is interruptible
1160		*/
1161	<	public void testLatchTimedAwait_InterruptedException() {
1161	>	public void testAcquireSharedInterruptibly_Interruptible() {
1162		final BooleanLatch l = new BooleanLatch();
1163	<	Thread t = new Thread(new Runnable() {
1164	<	public void run() {
1165	<	try {
1166	<	threadAssertFalse(l.isSignalled());
1167	<	l.acquireSharedNanos(0, SMALL_DELAY_MS* 1000 * 1000);
1168	<	threadShouldThrow();
1169	<	} catch(InterruptedException success){}
1170	<	}
1171	<	});
1172	<	t.start();
1173	<	try {
646	<	Thread.sleep(SHORT_DELAY_MS);
647	<	assertFalse(l.isSignalled());
648	<	t.interrupt();
649	<	t.join();
650	<	} catch (InterruptedException e){
651	<	unexpectedException();
652	<	}
1163	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1164	>	public void realRun() throws InterruptedException {
1165	>	assertFalse(l.isSignalled());
1166	>	l.acquireSharedInterruptibly(0);
1167	>	}});
1168	>
1169	>	waitForQueuedThread(l, t);
1170	>	assertFalse(l.isSignalled());
1171	>	t.interrupt();
1172	>	awaitTermination(t);
1173	>	assertFalse(l.isSignalled());
1174		}
1175
1176		/**
1177	<	* acquireSharedTimed times out if not released before timeout
1177	>	* tryAcquireSharedNanos is interruptible
1178		*/
1179	<	public void testLatchAwaitTimeout() {
1179	>	public void testTryAcquireSharedNanos_Interruptible() {
1180		final BooleanLatch l = new BooleanLatch();
1181	<	Thread t = new Thread(new Runnable() {
1182	<	public void run() {
1183	<	try {
1184	<	threadAssertFalse(l.isSignalled());
1185	<	threadAssertFalse(l.acquireSharedNanos(0, SMALL_DELAY_MS* 1000 * 1000));
1186	<	} catch(InterruptedException ie){
1187	<	threadUnexpectedException();
1188	<	}
1181	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1182	>	public void realRun() throws InterruptedException {
1183	>	assertFalse(l.isSignalled());
1184	>	long nanos = MILLISECONDS.toNanos(2 * LONG_DELAY_MS);
1185	>	l.tryAcquireSharedNanos(0, nanos);
1186	>	}});
1187	>
1188	>	waitForQueuedThread(l, t);
1189	>	assertFalse(l.isSignalled());
1190	>	t.interrupt();
1191	>	awaitTermination(t);
1192	>	assertFalse(l.isSignalled());
1193	>	}
1194	>
1195	>	/**
1196	>	* tryAcquireSharedNanos times out if not released before timeout
1197	>	*/
1198	>	public void testTryAcquireSharedNanos_Timeout() {
1199	>	final BooleanLatch l = new BooleanLatch();
1200	>	final BooleanLatch observedQueued = new BooleanLatch();
1201	>	final long timeoutMillis = timeoutMillis();
1202	>	Thread t = newStartedThread(new CheckedRunnable() {
1203	>	public void realRun() throws InterruptedException {
1204	>	assertFalse(l.isSignalled());
1205	>	for (long millis = timeoutMillis();
1206	>	!observedQueued.isSignalled();
1207	>	millis *= 2) {
1208	>	long nanos = MILLISECONDS.toNanos(millis);
1209	>	long startTime = System.nanoTime();
1210	>	assertFalse(l.tryAcquireSharedNanos(0, nanos));
1211	>	assertTrue(millisElapsedSince(startTime) >= millis);
1212		}
1213	<	});
1214	<	t.start();
1215	<	try {
1216	<	Thread.sleep(SHORT_DELAY_MS);
1217	<	assertFalse(l.isSignalled());
1218	<	t.join();
1219	<	} catch (InterruptedException e){
1220	<	unexpectedException();
1221	<	}
1213	>	assertFalse(l.isSignalled());
1214	>	}});
1215	>
1216	>	waitForQueuedThread(l, t);
1217	>	observedQueued.releaseShared(0);
1218	>	assertFalse(l.isSignalled());
1219	>	awaitTermination(t);
1220	>	assertFalse(l.isSignalled());
1221	>	}
1222	>
1223	>	/**
1224	>	* awaitNanos/timed await with 0 wait times out immediately
1225	>	*/
1226	>	public void testAwait_Zero() throws InterruptedException {
1227	>	final Mutex sync = new Mutex();
1228	>	final ConditionObject c = sync.newCondition();
1229	>	sync.acquire();
1230	>	assertTrue(c.awaitNanos(0L) <= 0);
1231	>	assertFalse(c.await(0L, NANOSECONDS));
1232	>	sync.release();
1233		}
1234	<
1234	>
1235	>	/**
1236	>	* awaitNanos/timed await with maximum negative wait times does not underflow
1237	>	*/
1238	>	public void testAwait_NegativeInfinity() throws InterruptedException {
1239	>	final Mutex sync = new Mutex();
1240	>	final ConditionObject c = sync.newCondition();
1241	>	sync.acquire();
1242	>	assertTrue(c.awaitNanos(Long.MIN_VALUE) <= 0);
1243	>	assertFalse(c.await(Long.MIN_VALUE, NANOSECONDS));
1244	>	sync.release();
1245	>	}
1246	>
1247		}

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