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Comparing jsr166/src/test/tck/AbstractQueuedSynchronizerTest.java (file contents):
Revision 1.14 by dl, Sat Jan 10 01:41:59 2004 UTC vs.
Revision 1.45 by jsr166, Tue Dec 2 07:23:13 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	–
9		import junit.framework.*;
10		import java.util.*;
11	<	import java.util.concurrent.*;
12	<	import java.util.concurrent.locks.*;
13	<	import java.io.*;
11	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
12	>	import static java.util.concurrent.TimeUnit.NANOSECONDS;
13	>	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
14	>	import java.util.concurrent.locks.AbstractQueuedSynchronizer.ConditionObject;
15
16		public class AbstractQueuedSynchronizerTest extends JSR166TestCase {
17		public static void main(String[] args) {
18	<	junit.textui.TestRunner.run (suite());
18	>	junit.textui.TestRunner.run(suite());
19		}
20		public static Test suite() {
21		return new TestSuite(AbstractQueuedSynchronizerTest.class);
22		}
23
24		/**
25	<	* A simple mutex class, adapted from the
26	<	* AbstractQueuedSynchronizer javadoc.  Exclusive acquire tests
27	<	* exercise this as a sample user extension.  Other
28	<	* methods/features of AbstractQueuedSynchronizerTest are tested
29	<	* via other test classes, including those for ReentrantLock,
30	<	* ReentrantReadWriteLock, and Semaphore
25	>	* A simple mutex class, adapted from the class javadoc.  Exclusive
26	>	* acquire tests exercise this as a sample user extension.  Other
27	>	* methods/features of AbstractQueuedSynchronizer are tested via
28	>	* other test classes, including those for ReentrantLock,
29	>	* ReentrantReadWriteLock, and Semaphore.
30		*/
31		static class Mutex extends AbstractQueuedSynchronizer {
32	<	public boolean isLocked() { return getState() == 1; }
33	<
34	<	public boolean tryAcquireExclusive(int acquires) {
35	<	assertTrue(acquires == 1);
36	<	return compareAndSetState(0, 1);
37	<	}
38	<
39	<	public boolean tryReleaseExclusive(int releases) {
40	<	setState(0);
32	>	/** An eccentric value for locked synchronizer state. */
33	>	static final int LOCKED = (1 << 31) | (1 << 15);
34	>
35	>	static final int UNLOCKED = 0;
36	>
37	>	@Override public boolean isHeldExclusively() {
38	>	int state = getState();
39	>	assertTrue(state == UNLOCKED || state == LOCKED);
40	>	return state == LOCKED;
41	>	}
42	>
43	>	@Override public boolean tryAcquire(int acquires) {
44	>	assertEquals(LOCKED, acquires);
45	>	return compareAndSetState(UNLOCKED, LOCKED);
46	>	}
47	>
48	>	@Override public boolean tryRelease(int releases) {
49	>	if (getState() != LOCKED) throw new IllegalMonitorStateException();
50	>	assertEquals(LOCKED, releases);
51	>	setState(UNLOCKED);
52		return true;
53		}
54	<
55	<	public void checkConditionAccess(Thread thread) {
56	<	if (getState() == 0) throw new IllegalMonitorStateException();
54	>
55	>	public boolean tryAcquireNanos(long nanos) throws InterruptedException {
56	>	return tryAcquireNanos(LOCKED, nanos);
57	>	}
58	>
59	>	public boolean tryAcquire() {
60	>	return tryAcquire(LOCKED);
61		}
62	<
63	<	public ConditionObject newCondition() { return new ConditionObject(); }
64	<
51	<	public void lock() {
52	<	acquireExclusiveUninterruptibly(1);
62	>
63	>	public boolean tryRelease() {
64	>	return tryRelease(LOCKED);
65		}
66
67	+	public void acquire() {
68	+	acquire(LOCKED);
69	+	}
70	+
71	+	public void acquireInterruptibly() throws InterruptedException {
72	+	acquireInterruptibly(LOCKED);
73	+	}
74	+
75	+	public void release() {
76	+	release(LOCKED);
77	+	}
78	+
79	+	public ConditionObject newCondition() {
80	+	return new ConditionObject();
81	+	}
82		}
83
57	–
84		/**
85		* A simple latch class, to test shared mode.
86		*/
87	<	static class BooleanLatch extends AbstractQueuedSynchronizer {
87	>	static class BooleanLatch extends AbstractQueuedSynchronizer {
88		public boolean isSignalled() { return getState() != 0; }
89
90		public int tryAcquireShared(int ignore) {
91	<	return isSignalled()? 1 : -1;
91	>	return isSignalled() ? 1 : -1;
92		}
93	<
93	>
94		public boolean tryReleaseShared(int ignore) {
95		setState(1);
96		return true;
#	Line 72 | Line 98 | public class AbstractQueuedSynchronizerT
98		}
99
100		/**
101	<	* A runnable calling acquireExclusiveInterruptibly
101	>	* A runnable calling acquireInterruptibly that does not expect to
102	>	* be interrupted.
103		*/
104	<	class InterruptibleLockRunnable implements Runnable {
105	<	final Mutex lock;
106	<	InterruptibleLockRunnable(Mutex l) { lock = l; }
107	<	public void run() {
108	<	try {
109	<	lock.acquireExclusiveInterruptibly(1);
110	<	} catch(InterruptedException success){}
104	>	class InterruptibleSyncRunnable extends CheckedRunnable {
105	>	final Mutex sync;
106	>	InterruptibleSyncRunnable(Mutex sync) { this.sync = sync; }
107	>	public void realRun() throws InterruptedException {
108	>	sync.acquireInterruptibly();
109	>	}
110	>	}
111	>
112	>	/**
113	>	* A runnable calling acquireInterruptibly that expects to be
114	>	* interrupted.
115	>	*/
116	>	class InterruptedSyncRunnable extends CheckedInterruptedRunnable {
117	>	final Mutex sync;
118	>	InterruptedSyncRunnable(Mutex sync) { this.sync = sync; }
119	>	public void realRun() throws InterruptedException {
120	>	sync.acquireInterruptibly();
121		}
122		}
123
124	+	/** A constant to clarify calls to checking methods below. */
125	+	static final Thread[] NO_THREADS = new Thread[0];
126
127		/**
128	<	* A runnable calling acquireExclusiveInterruptibly that expects to be
90	<	* interrupted
128	>	* Spin-waits until sync.isQueued(t) becomes true.
129		*/
130	<	class InterruptedLockRunnable implements Runnable {
131	<	final Mutex lock;
132	<	InterruptedLockRunnable(Mutex l) { lock = l; }
133	<	public void run() {
134	<	try {
135	<	lock.acquireExclusiveInterruptibly(1);
98	<	threadShouldThrow();
99	<	} catch(InterruptedException success){}
130	>	void waitForQueuedThread(AbstractQueuedSynchronizer sync, Thread t) {
131	>	long startTime = System.nanoTime();
132	>	while (!sync.isQueued(t)) {
133	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
134	>	throw new AssertionFailedError("timed out");
135	>	Thread.yield();
136		}
137	+	assertTrue(t.isAlive());
138		}
139	<
139	>
140		/**
141	<	* acquireExclusiveUninterruptiblying an releaseExclusiveed lock succeeds
141	>	* Checks that sync has exactly the given queued threads.
142		*/
143	<	public void testAcquireExclusiveUninterruptibly() {
144	<	Mutex rl = new Mutex();
145	<	rl.acquireExclusiveUninterruptibly(1);
146	<	assertTrue(rl.isLocked());
147	<	rl.releaseExclusive(1);
143	>	void assertHasQueuedThreads(AbstractQueuedSynchronizer sync,
144	>	Thread... expected) {
145	>	Collection<Thread> actual = sync.getQueuedThreads();
146	>	assertEquals(expected.length > 0, sync.hasQueuedThreads());
147	>	assertEquals(expected.length, sync.getQueueLength());
148	>	assertEquals(expected.length, actual.size());
149	>	assertEquals(expected.length == 0, actual.isEmpty());
150	>	assertEquals(new HashSet<Thread>(actual),
151	>	new HashSet<Thread>(Arrays.asList(expected)));
152		}
153
154		/**
155	<	* tryAcquireExclusive on an releaseExclusiveed lock succeeds
155	>	* Checks that sync has exactly the given (exclusive) queued threads.
156		*/
157	<	public void testTryAcquireExclusive() {
158	<	Mutex rl = new Mutex();
159	<	assertTrue(rl.tryAcquireExclusive(1));
160	<	assertTrue(rl.isLocked());
161	<	rl.releaseExclusive(1);
157	>	void assertHasExclusiveQueuedThreads(AbstractQueuedSynchronizer sync,
158	>	Thread... expected) {
159	>	assertHasQueuedThreads(sync, expected);
160	>	assertEquals(new HashSet<Thread>(sync.getExclusiveQueuedThreads()),
161	>	new HashSet<Thread>(sync.getQueuedThreads()));
162	>	assertEquals(0, sync.getSharedQueuedThreads().size());
163	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
164		}
165
166		/**
167	<	* hasQueuedThreads reports whether there are waiting threads
167	>	* Checks that sync has exactly the given (shared) queued threads.
168		*/
169	<	public void testhasQueuedThreads() {
170	<	final Mutex lock = new Mutex();
171	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
172	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
173	<	try {
174	<	assertFalse(lock.hasQueuedThreads());
175	<	lock.acquireExclusiveUninterruptibly(1);
176	<	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	<	}
169	>	void assertHasSharedQueuedThreads(AbstractQueuedSynchronizer sync,
170	>	Thread... expected) {
171	>	assertHasQueuedThreads(sync, expected);
172	>	assertEquals(new HashSet<Thread>(sync.getSharedQueuedThreads()),
173	>	new HashSet<Thread>(sync.getQueuedThreads()));
174	>	assertEquals(0, sync.getExclusiveQueuedThreads().size());
175	>	assertTrue(sync.getExclusiveQueuedThreads().isEmpty());
176	>	}
177
178	+	/**
179	+	* Checks that condition c has exactly the given waiter threads,
180	+	* after acquiring mutex.
181	+	*/
182	+	void assertHasWaitersUnlocked(Mutex sync, ConditionObject c,
183	+	Thread... threads) {
184	+	sync.acquire();
185	+	assertHasWaitersLocked(sync, c, threads);
186	+	sync.release();
187	+	}
188
189		/**
190	<	* hasContended reports false if no thread has ever blocked, else true
190	>	* Checks that condition c has exactly the given waiter threads.
191		*/
192	<	public void testHasContended() {
193	<	final Mutex lock = new Mutex();
194	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
195	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
196	<	try {
197	<	assertFalse(lock.hasContended());
198	<	lock.acquireExclusiveUninterruptibly(1);
199	<	t1.start();
200	<	Thread.sleep(SHORT_DELAY_MS);
201	<	assertTrue(lock.hasContended());
202	<	t2.start();
203	<	Thread.sleep(SHORT_DELAY_MS);
204	<	assertTrue(lock.hasContended());
205	<	t1.interrupt();
206	<	Thread.sleep(SHORT_DELAY_MS);
207	<	assertTrue(lock.hasContended());
208	<	lock.releaseExclusive(1);
209	<	Thread.sleep(SHORT_DELAY_MS);
210	<	assertTrue(lock.hasContended());
211	<	t1.join();
212	<	t2.join();
213	<	} catch(Exception e){
214	<	unexpectedException();
215	<	}
216	<	}
217	<
218	<	/**
219	<	* acquireExclusiveNanos is interruptible.
220	<	*/
221	<	public void testInterruptedException2() {
222	<	final Mutex lock = new Mutex();
223	<	lock.acquireExclusiveUninterruptibly(1);
224	<	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();
192	>	void assertHasWaitersLocked(Mutex sync, ConditionObject c,
193	>	Thread... threads) {
194	>	assertEquals(threads.length > 0, sync.hasWaiters(c));
195	>	assertEquals(threads.length, sync.getWaitQueueLength(c));
196	>	assertEquals(threads.length == 0, sync.getWaitingThreads(c).isEmpty());
197	>	assertEquals(threads.length, sync.getWaitingThreads(c).size());
198	>	assertEquals(new HashSet<Thread>(sync.getWaitingThreads(c)),
199	>	new HashSet<Thread>(Arrays.asList(threads)));
200	>	}
201	>
202	>	enum AwaitMethod { await, awaitTimed, awaitNanos, awaitUntil };
203	>
204	>	/**
205	>	* Awaits condition using the specified AwaitMethod.
206	>	*/
207	>	void await(ConditionObject c, AwaitMethod awaitMethod)
208	>	throws InterruptedException {
209	>	long timeoutMillis = 2 * LONG_DELAY_MS;
210	>	switch (awaitMethod) {
211	>	case await:
212	>	c.await();
213	>	break;
214	>	case awaitTimed:
215	>	assertTrue(c.await(timeoutMillis, MILLISECONDS));
216	>	break;
217	>	case awaitNanos:
218	>	long nanosTimeout = MILLISECONDS.toNanos(timeoutMillis);
219	>	long nanosRemaining = c.awaitNanos(nanosTimeout);
220	>	assertTrue(nanosRemaining > 0);
221	>	break;
222	>	case awaitUntil:
223	>	assertTrue(c.awaitUntil(delayedDate(timeoutMillis)));
224	>	break;
225		}
226		}
227
228	+	/**
229	+	* Checks that awaiting the given condition times out (using the
230	+	* default timeout duration).
231	+	*/
232	+	void assertAwaitTimesOut(ConditionObject c, AwaitMethod awaitMethod) {
233	+	long timeoutMillis = timeoutMillis();
234	+	long startTime = System.nanoTime();
235	+	try {
236	+	switch (awaitMethod) {
237	+	case awaitTimed:
238	+	assertFalse(c.await(timeoutMillis, MILLISECONDS));
239	+	break;
240	+	case awaitNanos:
241	+	long nanosTimeout = MILLISECONDS.toNanos(timeoutMillis);
242	+	long nanosRemaining = c.awaitNanos(nanosTimeout);
243	+	assertTrue(nanosRemaining <= 0);
244	+	break;
245	+	case awaitUntil:
246	+	assertFalse(c.awaitUntil(delayedDate(timeoutMillis)));
247	+	break;
248	+	default:
249	+	throw new UnsupportedOperationException();
250	+	}
251	+	} catch (InterruptedException ie) { threadUnexpectedException(ie); }
252	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
253	+	}
254	+
255	+	/**
256	+	* isHeldExclusively is false upon construction
257	+	*/
258	+	public void testIsHeldExclusively() {
259	+	Mutex sync = new Mutex();
260	+	assertFalse(sync.isHeldExclusively());
261	+	}
262	+
263	+	/**
264	+	* acquiring released sync succeeds
265	+	*/
266	+	public void testAcquire() {
267	+	Mutex sync = new Mutex();
268	+	sync.acquire();
269	+	assertTrue(sync.isHeldExclusively());
270	+	sync.release();
271	+	assertFalse(sync.isHeldExclusively());
272	+	}
273	+
274	+	/**
275	+	* tryAcquire on a released sync succeeds
276	+	*/
277	+	public void testTryAcquire() {
278	+	Mutex sync = new Mutex();
279	+	assertTrue(sync.tryAcquire());
280	+	assertTrue(sync.isHeldExclusively());
281	+	sync.release();
282	+	assertFalse(sync.isHeldExclusively());
283	+	}
284	+
285	+	/**
286	+	* hasQueuedThreads reports whether there are waiting threads
287	+	*/
288	+	public void testHasQueuedThreads() {
289	+	final Mutex sync = new Mutex();
290	+	assertFalse(sync.hasQueuedThreads());
291	+	sync.acquire();
292	+	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
293	+	waitForQueuedThread(sync, t1);
294	+	assertTrue(sync.hasQueuedThreads());
295	+	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
296	+	waitForQueuedThread(sync, t2);
297	+	assertTrue(sync.hasQueuedThreads());
298	+	t1.interrupt();
299	+	awaitTermination(t1);
300	+	assertTrue(sync.hasQueuedThreads());
301	+	sync.release();
302	+	awaitTermination(t2);
303	+	assertFalse(sync.hasQueuedThreads());
304	+	}
305	+
306	+	/**
307	+	* isQueued(null) throws NullPointerException
308	+	*/
309	+	public void testIsQueuedNPE() {
310	+	final Mutex sync = new Mutex();
311	+	try {
312	+	sync.isQueued(null);
313	+	shouldThrow();
314	+	} catch (NullPointerException success) {}
315	+	}
316	+
317	+	/**
318	+	* isQueued reports whether a thread is queued
319	+	*/
320	+	public void testIsQueued() {
321	+	final Mutex sync = new Mutex();
322	+	Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
323	+	Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
324	+	assertFalse(sync.isQueued(t1));
325	+	assertFalse(sync.isQueued(t2));
326	+	sync.acquire();
327	+	t1.start();
328	+	waitForQueuedThread(sync, t1);
329	+	assertTrue(sync.isQueued(t1));
330	+	assertFalse(sync.isQueued(t2));
331	+	t2.start();
332	+	waitForQueuedThread(sync, t2);
333	+	assertTrue(sync.isQueued(t1));
334	+	assertTrue(sync.isQueued(t2));
335	+	t1.interrupt();
336	+	awaitTermination(t1);
337	+	assertFalse(sync.isQueued(t1));
338	+	assertTrue(sync.isQueued(t2));
339	+	sync.release();
340	+	awaitTermination(t2);
341	+	assertFalse(sync.isQueued(t1));
342	+	assertFalse(sync.isQueued(t2));
343	+	}
344	+
345	+	/**
346	+	* getFirstQueuedThread returns first waiting thread or null if none
347	+	*/
348	+	public void testGetFirstQueuedThread() {
349	+	final Mutex sync = new Mutex();
350	+	assertNull(sync.getFirstQueuedThread());
351	+	sync.acquire();
352	+	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
353	+	waitForQueuedThread(sync, t1);
354	+	assertEquals(t1, sync.getFirstQueuedThread());
355	+	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
356	+	waitForQueuedThread(sync, t2);
357	+	assertEquals(t1, sync.getFirstQueuedThread());
358	+	t1.interrupt();
359	+	awaitTermination(t1);
360	+	assertEquals(t2, sync.getFirstQueuedThread());
361	+	sync.release();
362	+	awaitTermination(t2);
363	+	assertNull(sync.getFirstQueuedThread());
364	+	}
365
366		/**
367	<	* TryAcquireExclusive on a locked lock fails
368	<	*/
369	<	public void testTryAcquireExclusiveWhenLocked() {
370	<	final Mutex lock = new Mutex();
371	<	lock.acquireExclusiveUninterruptibly(1);
372	<	Thread t = new Thread(new Runnable() {
373	<	public void run() {
374	<	threadAssertFalse(lock.tryAcquireExclusive(1));
375	<	}
376	<	});
377	<	try {
378	<	t.start();
379	<	t.join();
380	<	lock.releaseExclusive(1);
381	<	} catch(Exception e){
382	<	unexpectedException();
383	<	}
384	<	}
385	<
386	<	/**
387	<	* acquireExclusiveNanos on a locked lock times out
388	<	*/
389	<	public void testAcquireExclusiveNanos_Timeout() {
390	<	final Mutex lock = new Mutex();
391	<	lock.acquireExclusiveUninterruptibly(1);
392	<	Thread t = new Thread(new Runnable() {
393	<	public void run() {
394	<	try {
395	<	threadAssertFalse(lock.acquireExclusiveNanos(1, 1000 * 1000));
396	<	} catch (Exception ex) {
397	<	threadUnexpectedException();
398	<	}
399	<	}
400	<	});
401	<	try {
402	<	t.start();
403	<	t.join();
404	<	lock.releaseExclusive(1);
405	<	} catch(Exception e){
406	<	unexpectedException();
407	<	}
408	<	}
409	<
410	<
367	>	* hasContended reports false if no thread has ever blocked, else true
368	>	*/
369	>	public void testHasContended() {
370	>	final Mutex sync = new Mutex();
371	>	assertFalse(sync.hasContended());
372	>	sync.acquire();
373	>	assertFalse(sync.hasContended());
374	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
375	>	waitForQueuedThread(sync, t1);
376	>	assertTrue(sync.hasContended());
377	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
378	>	waitForQueuedThread(sync, t2);
379	>	assertTrue(sync.hasContended());
380	>	t1.interrupt();
381	>	awaitTermination(t1);
382	>	assertTrue(sync.hasContended());
383	>	sync.release();
384	>	awaitTermination(t2);
385	>	assertTrue(sync.hasContended());
386	>	}
387	>
388	>	/**
389	>	* getQueuedThreads returns all waiting threads
390	>	*/
391	>	public void testGetQueuedThreads() {
392	>	final Mutex sync = new Mutex();
393	>	Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
394	>	Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
395	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
396	>	sync.acquire();
397	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
398	>	t1.start();
399	>	waitForQueuedThread(sync, t1);
400	>	assertHasExclusiveQueuedThreads(sync, t1);
401	>	assertTrue(sync.getQueuedThreads().contains(t1));
402	>	assertFalse(sync.getQueuedThreads().contains(t2));
403	>	t2.start();
404	>	waitForQueuedThread(sync, t2);
405	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
406	>	assertTrue(sync.getQueuedThreads().contains(t1));
407	>	assertTrue(sync.getQueuedThreads().contains(t2));
408	>	t1.interrupt();
409	>	awaitTermination(t1);
410	>	assertHasExclusiveQueuedThreads(sync, t2);
411	>	sync.release();
412	>	awaitTermination(t2);
413	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
414	>	}
415	>
416	>	/**
417	>	* getExclusiveQueuedThreads returns all exclusive waiting threads
418	>	*/
419	>	public void testGetExclusiveQueuedThreads() {
420	>	final Mutex sync = new Mutex();
421	>	Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
422	>	Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
423	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
424	>	sync.acquire();
425	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
426	>	t1.start();
427	>	waitForQueuedThread(sync, t1);
428	>	assertHasExclusiveQueuedThreads(sync, t1);
429	>	assertTrue(sync.getExclusiveQueuedThreads().contains(t1));
430	>	assertFalse(sync.getExclusiveQueuedThreads().contains(t2));
431	>	t2.start();
432	>	waitForQueuedThread(sync, t2);
433	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
434	>	assertTrue(sync.getExclusiveQueuedThreads().contains(t1));
435	>	assertTrue(sync.getExclusiveQueuedThreads().contains(t2));
436	>	t1.interrupt();
437	>	awaitTermination(t1);
438	>	assertHasExclusiveQueuedThreads(sync, t2);
439	>	sync.release();
440	>	awaitTermination(t2);
441	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
442	>	}
443	>
444	>	/**
445	>	* getSharedQueuedThreads does not include exclusively waiting threads
446	>	*/
447	>	public void testGetSharedQueuedThreads_Exclusive() {
448	>	final Mutex sync = new Mutex();
449	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
450	>	sync.acquire();
451	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
452	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
453	>	waitForQueuedThread(sync, t1);
454	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
455	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
456	>	waitForQueuedThread(sync, t2);
457	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
458	>	t1.interrupt();
459	>	awaitTermination(t1);
460	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
461	>	sync.release();
462	>	awaitTermination(t2);
463	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
464	>	}
465	>
466	>	/**
467	>	* getSharedQueuedThreads returns all shared waiting threads
468	>	*/
469	>	public void testGetSharedQueuedThreads_Shared() {
470	>	final BooleanLatch l = new BooleanLatch();
471	>	assertHasSharedQueuedThreads(l, NO_THREADS);
472	>	Thread t1 = newStartedThread(new CheckedInterruptedRunnable() {
473	>	public void realRun() throws InterruptedException {
474	>	l.acquireSharedInterruptibly(0);
475	>	}});
476	>	waitForQueuedThread(l, t1);
477	>	assertHasSharedQueuedThreads(l, t1);
478	>	Thread t2 = newStartedThread(new CheckedRunnable() {
479	>	public void realRun() throws InterruptedException {
480	>	l.acquireSharedInterruptibly(0);
481	>	}});
482	>	waitForQueuedThread(l, t2);
483	>	assertHasSharedQueuedThreads(l, t1, t2);
484	>	t1.interrupt();
485	>	awaitTermination(t1);
486	>	assertHasSharedQueuedThreads(l, t2);
487	>	assertTrue(l.releaseShared(0));
488	>	awaitTermination(t2);
489	>	assertHasSharedQueuedThreads(l, NO_THREADS);
490	>	}
491	>
492	>	/**
493	>	* tryAcquireNanos is interruptible
494	>	*/
495	>	public void testTryAcquireNanos_Interruptible() {
496	>	final Mutex sync = new Mutex();
497	>	sync.acquire();
498	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
499	>	public void realRun() throws InterruptedException {
500	>	sync.tryAcquireNanos(MILLISECONDS.toNanos(2 * LONG_DELAY_MS));
501	>	}});
502	>
503	>	waitForQueuedThread(sync, t);
504	>	t.interrupt();
505	>	awaitTermination(t);
506	>	}
507	>
508	>	/**
509	>	* tryAcquire on exclusively held sync fails
510	>	*/
511	>	public void testTryAcquireWhenSynced() {
512	>	final Mutex sync = new Mutex();
513	>	sync.acquire();
514	>	Thread t = newStartedThread(new CheckedRunnable() {
515	>	public void realRun() {
516	>	assertFalse(sync.tryAcquire());
517	>	}});
518	>
519	>	awaitTermination(t);
520	>	sync.release();
521	>	}
522	>
523	>	/**
524	>	* tryAcquireNanos on an exclusively held sync times out
525	>	*/
526	>	public void testAcquireNanos_Timeout() {
527	>	final Mutex sync = new Mutex();
528	>	sync.acquire();
529	>	Thread t = newStartedThread(new CheckedRunnable() {
530	>	public void realRun() throws InterruptedException {
531	>	long startTime = System.nanoTime();
532	>	long nanos = MILLISECONDS.toNanos(timeoutMillis());
533	>	assertFalse(sync.tryAcquireNanos(nanos));
534	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
535	>	}});
536	>
537	>	awaitTermination(t);
538	>	sync.release();
539	>	}
540	>
541		/**
542		* getState is true when acquired and false when not
543		*/
544		public void testGetState() {
545	<	final Mutex lock = new Mutex();
546	<	lock.acquireExclusiveUninterruptibly(1);
547	<	assertTrue(lock.isLocked());
548	<	lock.releaseExclusive(1);
549	<	assertFalse(lock.isLocked());
550	<	Thread t = new Thread(new Runnable() {
551	<	public void run() {
552	<	lock.acquireExclusiveUninterruptibly(1);
553	<	try {
554	<	Thread.sleep(SMALL_DELAY_MS);
555	<	}
556	<	catch(Exception e) {
557	<	threadUnexpectedException();
558	<	}
559	<	lock.releaseExclusive(1);
560	<	}
561	<	});
562	<	try {
563	<	t.start();
564	<	Thread.sleep(SHORT_DELAY_MS);
565	<	assertTrue(lock.isLocked());
349	<	t.join();
350	<	assertFalse(lock.isLocked());
351	<	} catch(Exception e){
352	<	unexpectedException();
353	<	}
545	>	final Mutex sync = new Mutex();
546	>	sync.acquire();
547	>	assertTrue(sync.isHeldExclusively());
548	>	sync.release();
549	>	assertFalse(sync.isHeldExclusively());
550	>
551	>	final BooleanLatch acquired = new BooleanLatch();
552	>	final BooleanLatch done = new BooleanLatch();
553	>	Thread t = newStartedThread(new CheckedRunnable() {
554	>	public void realRun() throws InterruptedException {
555	>	sync.acquire();
556	>	assertTrue(acquired.releaseShared(0));
557	>	done.acquireShared(0);
558	>	sync.release();
559	>	}});
560	>
561	>	acquired.acquireShared(0);
562	>	assertTrue(sync.isHeldExclusively());
563	>	assertTrue(done.releaseShared(0));
564	>	awaitTermination(t);
565	>	assertFalse(sync.isHeldExclusively());
566		}
567
568	+	/**
569	+	* acquireInterruptibly succeeds when released, else is interruptible
570	+	*/
571	+	public void testAcquireInterruptibly() throws InterruptedException {
572	+	final Mutex sync = new Mutex();
573	+	final BooleanLatch threadStarted = new BooleanLatch();
574	+	sync.acquireInterruptibly();
575	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
576	+	public void realRun() throws InterruptedException {
577	+	assertTrue(threadStarted.releaseShared(0));
578	+	sync.acquireInterruptibly();
579	+	}});
580	+
581	+	threadStarted.acquireShared(0);
582	+	waitForQueuedThread(sync, t);
583	+	t.interrupt();
584	+	awaitTermination(t);
585	+	assertTrue(sync.isHeldExclusively());
586	+	}
587
588		/**
589	<	* acquireExclusiveInterruptibly is interruptible.
590	<	*/
591	<	public void testAcquireInterruptibly1() {
592	<	final Mutex lock = new Mutex();
593	<	lock.acquireExclusiveUninterruptibly(1);
594	<	Thread t = new Thread(new InterruptedLockRunnable(lock));
595	<	try {
596	<	t.start();
597	<	t.interrupt();
598	<	lock.releaseExclusive(1);
599	<	t.join();
600	<	} catch(Exception e){
601	<	unexpectedException();
602	<	}
603	<	}
604	<
605	<	/**
606	<	* acquireExclusiveInterruptibly succeeds when released, else is interruptible
607	<	*/
608	<	public void testAcquireInterruptibly2() {
609	<	final Mutex lock = new Mutex();
610	<	try {
611	<	lock.acquireExclusiveInterruptibly(1);
612	<	} 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();
589	>	* owns is true for a condition created by sync else false
590	>	*/
591	>	public void testOwns() {
592	>	final Mutex sync = new Mutex();
593	>	final ConditionObject c = sync.newCondition();
594	>	final Mutex sync2 = new Mutex();
595	>	assertTrue(sync.owns(c));
596	>	assertFalse(sync2.owns(c));
597	>	}
598	>
599	>	/**
600	>	* Calling await without holding sync throws IllegalMonitorStateException
601	>	*/
602	>	public void testAwait_IMSE() {
603	>	final Mutex sync = new Mutex();
604	>	final ConditionObject c = sync.newCondition();
605	>	for (AwaitMethod awaitMethod : AwaitMethod.values()) {
606	>	long startTime = System.nanoTime();
607	>	try {
608	>	await(c, awaitMethod);
609	>	shouldThrow();
610	>	} catch (IllegalMonitorStateException success) {
611	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
612	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
613		}
614		}
615
616		/**
617	<	* owns is true for a condition created by lock else false
617	>	* Calling signal without holding sync throws IllegalMonitorStateException
618		*/
619	<	public void testOwns() {
620	<	final Mutex lock = new Mutex();
621	<	final AbstractQueuedSynchronizer.ConditionObject c = lock.newCondition();
622	<	final Mutex lock2 = new Mutex();
623	<	assertTrue(lock.owns(c));
624	<	assertFalse(lock2.owns(c));
619	>	public void testSignal_IMSE() {
620	>	final Mutex sync = new Mutex();
621	>	final ConditionObject c = sync.newCondition();
622	>	try {
623	>	c.signal();
624	>	shouldThrow();
625	>	} catch (IllegalMonitorStateException success) {}
626	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
627		}
628
629		/**
630	<	* Calling await without holding lock throws IllegalMonitorStateException
630	>	* Calling signalAll without holding sync throws IllegalMonitorStateException
631		*/
632	<	public void testAwait_IllegalMonitor() {
633	<	final Mutex lock = new Mutex();
634	<	final Condition c = lock.newCondition();
632	>	public void testSignalAll_IMSE() {
633	>	final Mutex sync = new Mutex();
634	>	final ConditionObject c = sync.newCondition();
635		try {
636	<	c.await();
636	>	c.signalAll();
637		shouldThrow();
638	<	}
416	<	catch (IllegalMonitorStateException success) {
417	<	}
418	<	catch (Exception ex) {
419	<	unexpectedException();
420	<	}
638	>	} catch (IllegalMonitorStateException success) {}
639		}
640
641		/**
642	<	* Calling signal without holding lock throws IllegalMonitorStateException
642	>	* await/awaitNanos/awaitUntil without a signal times out
643		*/
644	<	public void testSignal_IllegalMonitor() {
645	<	final Mutex lock = new Mutex();
646	<	final Condition c = lock.newCondition();
644	>	public void testAwaitTimed_Timeout() { testAwait_Timeout(AwaitMethod.awaitTimed); }
645	>	public void testAwaitNanos_Timeout() { testAwait_Timeout(AwaitMethod.awaitNanos); }
646	>	public void testAwaitUntil_Timeout() { testAwait_Timeout(AwaitMethod.awaitUntil); }
647	>	public void testAwait_Timeout(AwaitMethod awaitMethod) {
648	>	final Mutex sync = new Mutex();
649	>	final ConditionObject c = sync.newCondition();
650	>	sync.acquire();
651	>	assertAwaitTimesOut(c, awaitMethod);
652	>	sync.release();
653	>	}
654	>
655	>	/**
656	>	* await/awaitNanos/awaitUntil returns when signalled
657	>	*/
658	>	public void testSignal_await()      { testSignal(AwaitMethod.await); }
659	>	public void testSignal_awaitTimed() { testSignal(AwaitMethod.awaitTimed); }
660	>	public void testSignal_awaitNanos() { testSignal(AwaitMethod.awaitNanos); }
661	>	public void testSignal_awaitUntil() { testSignal(AwaitMethod.awaitUntil); }
662	>	public void testSignal(final AwaitMethod awaitMethod) {
663	>	final Mutex sync = new Mutex();
664	>	final ConditionObject c = sync.newCondition();
665	>	final BooleanLatch acquired = new BooleanLatch();
666	>	Thread t = newStartedThread(new CheckedRunnable() {
667	>	public void realRun() throws InterruptedException {
668	>	sync.acquire();
669	>	assertTrue(acquired.releaseShared(0));
670	>	await(c, awaitMethod);
671	>	sync.release();
672	>	}});
673	>
674	>	acquired.acquireShared(0);
675	>	sync.acquire();
676	>	assertHasWaitersLocked(sync, c, t);
677	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
678	>	c.signal();
679	>	assertHasWaitersLocked(sync, c, NO_THREADS);
680	>	assertHasExclusiveQueuedThreads(sync, t);
681	>	sync.release();
682	>	awaitTermination(t);
683	>	}
684	>
685	>	/**
686	>	* hasWaiters(null) throws NullPointerException
687	>	*/
688	>	public void testHasWaitersNPE() {
689	>	final Mutex sync = new Mutex();
690		try {
691	<	c.signal();
691	>	sync.hasWaiters(null);
692		shouldThrow();
693	<	}
433	<	catch (IllegalMonitorStateException success) {
434	<	}
435	<	catch (Exception ex) {
436	<	unexpectedException();
437	<	}
693	>	} catch (NullPointerException success) {}
694		}
695
696		/**
697	<	* awaitNanos without a signal times out
697	>	* getWaitQueueLength(null) throws NullPointerException
698		*/
699	<	public void testAwaitNanos_Timeout() {
700	<	final Mutex lock = new Mutex();
445	<	final Condition c = lock.newCondition();
699	>	public void testGetWaitQueueLengthNPE() {
700	>	final Mutex sync = new Mutex();
701		try {
702	<	lock.acquireExclusiveUninterruptibly(1);
703	<	long t = c.awaitNanos(100);
704	<	assertTrue(t <= 0);
450	<	lock.releaseExclusive(1);
451	<	}
452	<	catch (Exception ex) {
453	<	unexpectedException();
454	<	}
702	>	sync.getWaitQueueLength(null);
703	>	shouldThrow();
704	>	} catch (NullPointerException success) {}
705		}
706
707		/**
708	<	*  timed await without a signal times out
708	>	* getWaitingThreads(null) throws NullPointerException
709		*/
710	<	public void testAwait_Timeout() {
711	<	final Mutex lock = new Mutex();
462	<	final Condition c = lock.newCondition();
710	>	public void testGetWaitingThreadsNPE() {
711	>	final Mutex sync = new Mutex();
712		try {
713	<	lock.acquireExclusiveUninterruptibly(1);
714	<	assertFalse(c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
715	<	lock.releaseExclusive(1);
467	<	}
468	<	catch (Exception ex) {
469	<	unexpectedException();
470	<	}
713	>	sync.getWaitingThreads(null);
714	>	shouldThrow();
715	>	} catch (NullPointerException success) {}
716		}
717
718		/**
719	<	* awaitUntil without a signal times out
719	>	* hasWaiters throws IllegalArgumentException if not owned
720		*/
721	<	public void testAwaitUntil_Timeout() {
722	<	final Mutex lock = new Mutex();
723	<	final Condition c = lock.newCondition();
721	>	public void testHasWaitersIAE() {
722	>	final Mutex sync = new Mutex();
723	>	final ConditionObject c = sync.newCondition();
724	>	final Mutex sync2 = new Mutex();
725		try {
726	<	lock.acquireExclusiveUninterruptibly(1);
727	<	java.util.Date d = new java.util.Date();
728	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
729	<	lock.releaseExclusive(1);
484	<	}
485	<	catch (Exception ex) {
486	<	unexpectedException();
487	<	}
726	>	sync2.hasWaiters(c);
727	>	shouldThrow();
728	>	} catch (IllegalArgumentException success) {}
729	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
730		}
731
732		/**
733	<	* await returns when signalled
733	>	* hasWaiters throws IllegalMonitorStateException if not synced
734		*/
735	<	public void testAwait() {
736	<	final Mutex lock = new Mutex();
737	<	final Condition c = lock.newCondition();
738	<	Thread t = new Thread(new Runnable() {
739	<	public void run() {
740	<	try {
741	<	lock.acquireExclusiveUninterruptibly(1);
742	<	c.await();
743	<	lock.releaseExclusive(1);
502	<	}
503	<	catch(InterruptedException e) {
504	<	threadUnexpectedException();
505	<	}
506	<	}
507	<	});
735	>	public void testHasWaitersIMSE() {
736	>	final Mutex sync = new Mutex();
737	>	final ConditionObject c = sync.newCondition();
738	>	try {
739	>	sync.hasWaiters(c);
740	>	shouldThrow();
741	>	} catch (IllegalMonitorStateException success) {}
742	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
743	>	}
744
745	+	/**
746	+	* getWaitQueueLength throws IllegalArgumentException if not owned
747	+	*/
748	+	public void testGetWaitQueueLengthIAE() {
749	+	final Mutex sync = new Mutex();
750	+	final ConditionObject c = sync.newCondition();
751	+	final Mutex sync2 = new Mutex();
752		try {
753	<	t.start();
754	<	Thread.sleep(SHORT_DELAY_MS);
755	<	lock.acquireExclusiveUninterruptibly(1);
756	<	c.signal();
514	<	lock.releaseExclusive(1);
515	<	t.join(SHORT_DELAY_MS);
516	<	assertFalse(t.isAlive());
517	<	}
518	<	catch (Exception ex) {
519	<	unexpectedException();
520	<	}
753	>	sync2.getWaitQueueLength(c);
754	>	shouldThrow();
755	>	} catch (IllegalArgumentException success) {}
756	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
757		}
758
759		/**
760	<	* toString indicates current state
760	>	* getWaitQueueLength throws IllegalMonitorStateException if not synced
761		*/
762	<	public void testToString() {
763	<	Mutex lock = new Mutex();
764	<	String us = lock.toString();
765	<	assertTrue(us.indexOf("State = 0") >= 0);
766	<	lock.acquireExclusiveUninterruptibly(1);
767	<	String ls = lock.toString();
768	<	assertTrue(ls.indexOf("State = 1") >= 0);
762	>	public void testGetWaitQueueLengthIMSE() {
763	>	final Mutex sync = new Mutex();
764	>	final ConditionObject c = sync.newCondition();
765	>	try {
766	>	sync.getWaitQueueLength(c);
767	>	shouldThrow();
768	>	} catch (IllegalMonitorStateException success) {}
769	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
770		}
771
772		/**
773	<	* A serialized AQS deserializes with current state
773	>	* getWaitingThreads throws IllegalArgumentException if not owned
774		*/
775	<	public void testSerialization() {
776	<	Mutex l = new Mutex();
777	<	l.acquireExclusiveUninterruptibly(1);
778	<	assertTrue(l.isLocked());
775	>	public void testGetWaitingThreadsIAE() {
776	>	final Mutex sync = new Mutex();
777	>	final ConditionObject c = sync.newCondition();
778	>	final Mutex sync2 = new Mutex();
779	>	try {
780	>	sync2.getWaitingThreads(c);
781	>	shouldThrow();
782	>	} catch (IllegalArgumentException success) {}
783	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
784	>	}
785
786	+	/**
787	+	* getWaitingThreads throws IllegalMonitorStateException if not synced
788	+	*/
789	+	public void testGetWaitingThreadsIMSE() {
790	+	final Mutex sync = new Mutex();
791	+	final ConditionObject c = sync.newCondition();
792		try {
793	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
794	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
795	<	out.writeObject(l);
796	<	out.close();
793	>	sync.getWaitingThreads(c);
794	>	shouldThrow();
795	>	} catch (IllegalMonitorStateException success) {}
796	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
797	>	}
798
799	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
800	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
801	<	Mutex r = (Mutex) in.readObject();
802	<	assertTrue(r.isLocked());
803	<	} catch(Exception e){
804	<	e.printStackTrace();
805	<	unexpectedException();
806	<	}
799	>	/**
800	>	* hasWaiters returns true when a thread is waiting, else false
801	>	*/
802	>	public void testHasWaiters() {
803	>	final Mutex sync = new Mutex();
804	>	final ConditionObject c = sync.newCondition();
805	>	final BooleanLatch acquired = new BooleanLatch();
806	>	Thread t = newStartedThread(new CheckedRunnable() {
807	>	public void realRun() throws InterruptedException {
808	>	sync.acquire();
809	>	assertHasWaitersLocked(sync, c, NO_THREADS);
810	>	assertFalse(sync.hasWaiters(c));
811	>	assertTrue(acquired.releaseShared(0));
812	>	c.await();
813	>	sync.release();
814	>	}});
815	>
816	>	acquired.acquireShared(0);
817	>	sync.acquire();
818	>	assertHasWaitersLocked(sync, c, t);
819	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
820	>	assertTrue(sync.hasWaiters(c));
821	>	c.signal();
822	>	assertHasWaitersLocked(sync, c, NO_THREADS);
823	>	assertHasExclusiveQueuedThreads(sync, t);
824	>	assertFalse(sync.hasWaiters(c));
825	>	sync.release();
826	>
827	>	awaitTermination(t);
828	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
829	>	}
830	>
831	>	/**
832	>	* getWaitQueueLength returns number of waiting threads
833	>	*/
834	>	public void testGetWaitQueueLength() {
835	>	final Mutex sync = new Mutex();
836	>	final ConditionObject c = sync.newCondition();
837	>	final BooleanLatch acquired1 = new BooleanLatch();
838	>	final BooleanLatch acquired2 = new BooleanLatch();
839	>	final Thread t1 = newStartedThread(new CheckedRunnable() {
840	>	public void realRun() throws InterruptedException {
841	>	sync.acquire();
842	>	assertHasWaitersLocked(sync, c, NO_THREADS);
843	>	assertEquals(0, sync.getWaitQueueLength(c));
844	>	assertTrue(acquired1.releaseShared(0));
845	>	c.await();
846	>	sync.release();
847	>	}});
848	>	acquired1.acquireShared(0);
849	>	sync.acquire();
850	>	assertHasWaitersLocked(sync, c, t1);
851	>	assertEquals(1, sync.getWaitQueueLength(c));
852	>	sync.release();
853	>
854	>	final Thread t2 = newStartedThread(new CheckedRunnable() {
855	>	public void realRun() throws InterruptedException {
856	>	sync.acquire();
857	>	assertHasWaitersLocked(sync, c, t1);
858	>	assertEquals(1, sync.getWaitQueueLength(c));
859	>	assertTrue(acquired2.releaseShared(0));
860	>	c.await();
861	>	sync.release();
862	>	}});
863	>	acquired2.acquireShared(0);
864	>	sync.acquire();
865	>	assertHasWaitersLocked(sync, c, t1, t2);
866	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
867	>	assertEquals(2, sync.getWaitQueueLength(c));
868	>	c.signalAll();
869	>	assertHasWaitersLocked(sync, c, NO_THREADS);
870	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
871	>	assertEquals(0, sync.getWaitQueueLength(c));
872	>	sync.release();
873	>
874	>	awaitTermination(t1);
875	>	awaitTermination(t2);
876	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
877	>	}
878	>
879	>	/**
880	>	* getWaitingThreads returns only and all waiting threads
881	>	*/
882	>	public void testGetWaitingThreads() {
883	>	final Mutex sync = new Mutex();
884	>	final ConditionObject c = sync.newCondition();
885	>	final BooleanLatch acquired1 = new BooleanLatch();
886	>	final BooleanLatch acquired2 = new BooleanLatch();
887	>	final Thread t1 = new Thread(new CheckedRunnable() {
888	>	public void realRun() throws InterruptedException {
889	>	sync.acquire();
890	>	assertHasWaitersLocked(sync, c, NO_THREADS);
891	>	assertTrue(sync.getWaitingThreads(c).isEmpty());
892	>	assertTrue(acquired1.releaseShared(0));
893	>	c.await();
894	>	sync.release();
895	>	}});
896	>
897	>	final Thread t2 = new Thread(new CheckedRunnable() {
898	>	public void realRun() throws InterruptedException {
899	>	sync.acquire();
900	>	assertHasWaitersLocked(sync, c, t1);
901	>	assertTrue(sync.getWaitingThreads(c).contains(t1));
902	>	assertFalse(sync.getWaitingThreads(c).isEmpty());
903	>	assertEquals(1, sync.getWaitingThreads(c).size());
904	>	assertTrue(acquired2.releaseShared(0));
905	>	c.await();
906	>	sync.release();
907	>	}});
908	>
909	>	sync.acquire();
910	>	assertHasWaitersLocked(sync, c, NO_THREADS);
911	>	assertFalse(sync.getWaitingThreads(c).contains(t1));
912	>	assertFalse(sync.getWaitingThreads(c).contains(t2));
913	>	assertTrue(sync.getWaitingThreads(c).isEmpty());
914	>	assertEquals(0, sync.getWaitingThreads(c).size());
915	>	sync.release();
916	>
917	>	t1.start();
918	>	acquired1.acquireShared(0);
919	>	sync.acquire();
920	>	assertHasWaitersLocked(sync, c, t1);
921	>	assertTrue(sync.getWaitingThreads(c).contains(t1));
922	>	assertFalse(sync.getWaitingThreads(c).contains(t2));
923	>	assertFalse(sync.getWaitingThreads(c).isEmpty());
924	>	assertEquals(1, sync.getWaitingThreads(c).size());
925	>	sync.release();
926	>
927	>	t2.start();
928	>	acquired2.acquireShared(0);
929	>	sync.acquire();
930	>	assertHasWaitersLocked(sync, c, t1, t2);
931	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
932	>	assertTrue(sync.getWaitingThreads(c).contains(t1));
933	>	assertTrue(sync.getWaitingThreads(c).contains(t2));
934	>	assertFalse(sync.getWaitingThreads(c).isEmpty());
935	>	assertEquals(2, sync.getWaitingThreads(c).size());
936	>	c.signalAll();
937	>	assertHasWaitersLocked(sync, c, NO_THREADS);
938	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
939	>	assertFalse(sync.getWaitingThreads(c).contains(t1));
940	>	assertFalse(sync.getWaitingThreads(c).contains(t2));
941	>	assertTrue(sync.getWaitingThreads(c).isEmpty());
942	>	assertEquals(0, sync.getWaitingThreads(c).size());
943	>	sync.release();
944	>
945	>	awaitTermination(t1);
946	>	awaitTermination(t2);
947	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
948	>	}
949	>
950	>	/**
951	>	* awaitUninterruptibly is uninterruptible
952	>	*/
953	>	public void testAwaitUninterruptibly() {
954	>	final Mutex sync = new Mutex();
955	>	final ConditionObject c = sync.newCondition();
956	>	final BooleanLatch pleaseInterrupt = new BooleanLatch();
957	>	Thread t = newStartedThread(new CheckedRunnable() {
958	>	public void realRun() {
959	>	sync.acquire();
960	>	assertTrue(pleaseInterrupt.releaseShared(0));
961	>	c.awaitUninterruptibly();
962	>	assertTrue(Thread.interrupted());
963	>	assertHasWaitersLocked(sync, c, NO_THREADS);
964	>	sync.release();
965	>	}});
966	>
967	>	pleaseInterrupt.acquireShared(0);
968	>	sync.acquire();
969	>	assertHasWaitersLocked(sync, c, t);
970	>	sync.release();
971	>	t.interrupt();
972	>	assertHasWaitersUnlocked(sync, c, t);
973	>	assertThreadStaysAlive(t);
974	>	sync.acquire();
975	>	assertHasWaitersLocked(sync, c, t);
976	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
977	>	c.signal();
978	>	assertHasWaitersLocked(sync, c, NO_THREADS);
979	>	assertHasExclusiveQueuedThreads(sync, t);
980	>	sync.release();
981	>	awaitTermination(t);
982	>	}
983	>
984	>	/**
985	>	* await/awaitNanos/awaitUntil is interruptible
986	>	*/
987	>	public void testInterruptible_await()      { testInterruptible(AwaitMethod.await); }
988	>	public void testInterruptible_awaitTimed() { testInterruptible(AwaitMethod.awaitTimed); }
989	>	public void testInterruptible_awaitNanos() { testInterruptible(AwaitMethod.awaitNanos); }
990	>	public void testInterruptible_awaitUntil() { testInterruptible(AwaitMethod.awaitUntil); }
991	>	public void testInterruptible(final AwaitMethod awaitMethod) {
992	>	final Mutex sync = new Mutex();
993	>	final ConditionObject c = sync.newCondition();
994	>	final BooleanLatch pleaseInterrupt = new BooleanLatch();
995	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
996	>	public void realRun() throws InterruptedException {
997	>	sync.acquire();
998	>	assertTrue(pleaseInterrupt.releaseShared(0));
999	>	await(c, awaitMethod);
1000	>	}});
1001	>
1002	>	pleaseInterrupt.acquireShared(0);
1003	>	t.interrupt();
1004	>	awaitTermination(t);
1005	>	}
1006	>
1007	>	/**
1008	>	* signalAll wakes up all threads
1009	>	*/
1010	>	public void testSignalAll_await()      { testSignalAll(AwaitMethod.await); }
1011	>	public void testSignalAll_awaitTimed() { testSignalAll(AwaitMethod.awaitTimed); }
1012	>	public void testSignalAll_awaitNanos() { testSignalAll(AwaitMethod.awaitNanos); }
1013	>	public void testSignalAll_awaitUntil() { testSignalAll(AwaitMethod.awaitUntil); }
1014	>	public void testSignalAll(final AwaitMethod awaitMethod) {
1015	>	final Mutex sync = new Mutex();
1016	>	final ConditionObject c = sync.newCondition();
1017	>	final BooleanLatch acquired1 = new BooleanLatch();
1018	>	final BooleanLatch acquired2 = new BooleanLatch();
1019	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1020	>	public void realRun() throws InterruptedException {
1021	>	sync.acquire();
1022	>	acquired1.releaseShared(0);
1023	>	await(c, awaitMethod);
1024	>	sync.release();
1025	>	}});
1026	>
1027	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1028	>	public void realRun() throws InterruptedException {
1029	>	sync.acquire();
1030	>	acquired2.releaseShared(0);
1031	>	await(c, awaitMethod);
1032	>	sync.release();
1033	>	}});
1034	>
1035	>	acquired1.acquireShared(0);
1036	>	acquired2.acquireShared(0);
1037	>	sync.acquire();
1038	>	assertHasWaitersLocked(sync, c, t1, t2);
1039	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
1040	>	c.signalAll();
1041	>	assertHasWaitersLocked(sync, c, NO_THREADS);
1042	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
1043	>	sync.release();
1044	>	awaitTermination(t1);
1045	>	awaitTermination(t2);
1046		}
1047
1048	+	/**
1049	+	* toString indicates current state
1050	+	*/
1051	+	public void testToString() {
1052	+	Mutex sync = new Mutex();
1053	+	assertTrue(sync.toString().contains("State = " + Mutex.UNLOCKED));
1054	+	sync.acquire();
1055	+	assertTrue(sync.toString().contains("State = " + Mutex.LOCKED));
1056	+	}
1057
1058		/**
1059	<	* Latch isSignalled initially returns false, then true after release
1059	>	* A serialized AQS deserializes with current state, but no queued threads
1060		*/
1061	<	public void testLatchIsSignalled() {
1062	<	final BooleanLatch l = new BooleanLatch();
1063	<	assertFalse(l.isSignalled());
1064	<	l.releaseShared(0);
1065	<	assertTrue(l.isSignalled());
1061	>	public void testSerialization() {
1062	>	Mutex sync = new Mutex();
1063	>	assertFalse(serialClone(sync).isHeldExclusively());
1064	>	sync.acquire();
1065	>	Thread t = newStartedThread(new InterruptedSyncRunnable(sync));
1066	>	waitForQueuedThread(sync, t);
1067	>	assertTrue(sync.isHeldExclusively());
1068	>
1069	>	Mutex clone = serialClone(sync);
1070	>	assertTrue(clone.isHeldExclusively());
1071	>	assertHasExclusiveQueuedThreads(sync, t);
1072	>	assertHasExclusiveQueuedThreads(clone, NO_THREADS);
1073	>	t.interrupt();
1074	>	awaitTermination(t);
1075	>	sync.release();
1076	>	assertFalse(sync.isHeldExclusively());
1077	>	assertTrue(clone.isHeldExclusively());
1078	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
1079	>	assertHasExclusiveQueuedThreads(clone, NO_THREADS);
1080	>	}
1081	>
1082	>	/**
1083	>	* tryReleaseShared setting state changes getState
1084	>	*/
1085	>	public void testGetStateWithReleaseShared() {
1086	>	final BooleanLatch l = new BooleanLatch();
1087	>	assertFalse(l.isSignalled());
1088	>	assertTrue(l.releaseShared(0));
1089	>	assertTrue(l.isSignalled());
1090		}
1091
1092		/**
1093	<	* release and has no effect when already signalled
1093	>	* releaseShared has no effect when already signalled
1094		*/
1095		public void testReleaseShared() {
1096	<	final BooleanLatch l = new BooleanLatch();
1097	<	assertFalse(l.isSignalled());
1098	<	l.releaseShared(0);
1099	<	assertTrue(l.isSignalled());
1100	<	l.releaseShared(0);
1101	<	assertTrue(l.isSignalled());
1096	>	final BooleanLatch l = new BooleanLatch();
1097	>	assertFalse(l.isSignalled());
1098	>	assertTrue(l.releaseShared(0));
1099	>	assertTrue(l.isSignalled());
1100	>	assertTrue(l.releaseShared(0));
1101	>	assertTrue(l.isSignalled());
1102		}
1103
1104		/**
1105		* acquireSharedInterruptibly returns after release, but not before
1106		*/
1107		public void testAcquireSharedInterruptibly() {
1108	<	final BooleanLatch l = new BooleanLatch();
1108	>	final BooleanLatch l = new BooleanLatch();
1109
1110	<	Thread t = new Thread(new Runnable() {
1111	<	public void run() {
1112	<	try {
1113	<	threadAssertFalse(l.isSignalled());
1114	<	l.acquireSharedInterruptibly(0);
1115	<	threadAssertTrue(l.isSignalled());
1116	<	} catch(InterruptedException e){
1117	<	threadUnexpectedException();
1118	<	}
1119	<	}
1120	<	});
1121	<	try {
1122	<	t.start();
1123	<	assertFalse(l.isSignalled());
1124	<	Thread.sleep(SHORT_DELAY_MS);
1125	<	l.releaseShared(0);
604	<	assertTrue(l.isSignalled());
605	<	t.join();
606	<	} catch (InterruptedException e){
607	<	unexpectedException();
608	<	}
609	<	}
610	<
611	<
612	<	/**
613	<	* acquireSharedTimed returns after release
614	<	*/
615	<	public void testAsquireSharedTimed() {
616	<	final BooleanLatch l = new BooleanLatch();
617	<
618	<	Thread t = new Thread(new Runnable() {
619	<	public void run() {
620	<	try {
621	<	threadAssertFalse(l.isSignalled());
622	<	threadAssertTrue(l.acquireSharedNanos(0, MEDIUM_DELAY_MS* 1000 * 1000));
623	<	threadAssertTrue(l.isSignalled());
624	<
625	<	} catch(InterruptedException e){
626	<	threadUnexpectedException();
627	<	}
628	<	}
629	<	});
630	<	try {
631	<	t.start();
632	<	assertFalse(l.isSignalled());
633	<	Thread.sleep(SHORT_DELAY_MS);
634	<	l.releaseShared(0);
635	<	assertTrue(l.isSignalled());
636	<	t.join();
637	<	} catch (InterruptedException e){
638	<	unexpectedException();
639	<	}
1110	>	Thread t = newStartedThread(new CheckedRunnable() {
1111	>	public void realRun() throws InterruptedException {
1112	>	assertFalse(l.isSignalled());
1113	>	l.acquireSharedInterruptibly(0);
1114	>	assertTrue(l.isSignalled());
1115	>	l.acquireSharedInterruptibly(0);
1116	>	assertTrue(l.isSignalled());
1117	>	}});
1118	>
1119	>	waitForQueuedThread(l, t);
1120	>	assertFalse(l.isSignalled());
1121	>	assertThreadStaysAlive(t);
1122	>	assertHasSharedQueuedThreads(l, t);
1123	>	assertTrue(l.releaseShared(0));
1124	>	assertTrue(l.isSignalled());
1125	>	awaitTermination(t);
1126		}
1127	<
1127	>
1128		/**
1129	<	* acquireSharedInterruptibly throws IE if interrupted before released
1129	>	* tryAcquireSharedNanos returns after release, but not before
1130		*/
1131	<	public void testAcquireSharedInterruptibly_InterruptedException() {
1131	>	public void testTryAcquireSharedNanos() {
1132		final BooleanLatch l = new BooleanLatch();
1133	<	Thread t = new Thread(new Runnable() {
1134	<	public void run() {
1135	<	try {
1136	<	threadAssertFalse(l.isSignalled());
1137	<	l.acquireSharedInterruptibly(0);
1138	<	threadShouldThrow();
1139	<	} catch(InterruptedException success){}
1140	<	}
1141	<	});
1142	<	t.start();
1143	<	try {
1144	<	assertFalse(l.isSignalled());
1145	<	t.interrupt();
1146	<	t.join();
1147	<	} catch (InterruptedException e){
1148	<	unexpectedException();
1149	<	}
1133	>
1134	>	Thread t = newStartedThread(new CheckedRunnable() {
1135	>	public void realRun() throws InterruptedException {
1136	>	assertFalse(l.isSignalled());
1137	>	long nanos = MILLISECONDS.toNanos(2 * LONG_DELAY_MS);
1138	>	assertTrue(l.tryAcquireSharedNanos(0, nanos));
1139	>	assertTrue(l.isSignalled());
1140	>	assertTrue(l.tryAcquireSharedNanos(0, nanos));
1141	>	assertTrue(l.isSignalled());
1142	>	}});
1143	>
1144	>	waitForQueuedThread(l, t);
1145	>	assertFalse(l.isSignalled());
1146	>	assertThreadStaysAlive(t);
1147	>	assertTrue(l.releaseShared(0));
1148	>	assertTrue(l.isSignalled());
1149	>	awaitTermination(t);
1150		}
1151
1152		/**
1153	<	* acquireSharedTimed throws IE if interrupted before released
1153	>	* acquireSharedInterruptibly is interruptible
1154		*/
1155	<	public void testAcquireSharedNanos_InterruptedException() {
1155	>	public void testAcquireSharedInterruptibly_Interruptible() {
1156		final BooleanLatch l = new BooleanLatch();
1157	<	Thread t = new Thread(new Runnable() {
1158	<	public void run() {
1159	<	try {
1160	<	threadAssertFalse(l.isSignalled());
1161	<	l.acquireSharedNanos(0, SMALL_DELAY_MS* 1000 * 1000);
1162	<	threadShouldThrow();
1163	<	} catch(InterruptedException success){}
1164	<	}
1165	<	});
1166	<	t.start();
1167	<	try {
1168	<	Thread.sleep(SHORT_DELAY_MS);
1169	<	assertFalse(l.isSignalled());
1170	<	t.interrupt();
1171	<	t.join();
1172	<	} catch (InterruptedException e){
1173	<	unexpectedException();
1174	<	}
1157	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1158	>	public void realRun() throws InterruptedException {
1159	>	assertFalse(l.isSignalled());
1160	>	l.acquireSharedInterruptibly(0);
1161	>	}});
1162	>
1163	>	waitForQueuedThread(l, t);
1164	>	assertFalse(l.isSignalled());
1165	>	t.interrupt();
1166	>	awaitTermination(t);
1167	>	assertFalse(l.isSignalled());
1168	>	}
1169	>
1170	>	/**
1171	>	* tryAcquireSharedNanos is interruptible
1172	>	*/
1173	>	public void testTryAcquireSharedNanos_Interruptible() {
1174	>	final BooleanLatch l = new BooleanLatch();
1175	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1176	>	public void realRun() throws InterruptedException {
1177	>	assertFalse(l.isSignalled());
1178	>	long nanos = MILLISECONDS.toNanos(2 * LONG_DELAY_MS);
1179	>	l.tryAcquireSharedNanos(0, nanos);
1180	>	}});
1181	>
1182	>	waitForQueuedThread(l, t);
1183	>	assertFalse(l.isSignalled());
1184	>	t.interrupt();
1185	>	awaitTermination(t);
1186	>	assertFalse(l.isSignalled());
1187		}
1188
1189		/**
1190	<	* acquireSharedTimed times out if not released before timeout
1190	>	* tryAcquireSharedNanos times out if not released before timeout
1191		*/
1192	<	public void testAcquireSharedNanos_Timeout() {
1192	>	public void testTryAcquireSharedNanos_Timeout() {
1193		final BooleanLatch l = new BooleanLatch();
1194	<	Thread t = new Thread(new Runnable() {
1195	<	public void run() {
1196	<	try {
1197	<	threadAssertFalse(l.isSignalled());
1198	<	threadAssertFalse(l.acquireSharedNanos(0, SMALL_DELAY_MS* 1000 * 1000));
1199	<	} catch(InterruptedException ie){
1200	<	threadUnexpectedException();
1201	<	}
1194	>	final BooleanLatch observedQueued = new BooleanLatch();
1195	>	final long timeoutMillis = timeoutMillis();
1196	>	Thread t = newStartedThread(new CheckedRunnable() {
1197	>	public void realRun() throws InterruptedException {
1198	>	assertFalse(l.isSignalled());
1199	>	for (long millis = timeoutMillis();
1200	>	!observedQueued.isSignalled();
1201	>	millis *= 2) {
1202	>	long nanos = MILLISECONDS.toNanos(millis);
1203	>	long startTime = System.nanoTime();
1204	>	assertFalse(l.tryAcquireSharedNanos(0, nanos));
1205	>	assertTrue(millisElapsedSince(startTime) >= millis);
1206		}
1207	<	});
1208	<	t.start();
1209	<	try {
1210	<	Thread.sleep(SHORT_DELAY_MS);
1211	<	assertFalse(l.isSignalled());
1212	<	t.join();
1213	<	} catch (InterruptedException e){
1214	<	unexpectedException();
1215	<	}
1207	>	assertFalse(l.isSignalled());
1208	>	}});
1209	>
1210	>	waitForQueuedThread(l, t);
1211	>	observedQueued.releaseShared(0);
1212	>	assertFalse(l.isSignalled());
1213	>	awaitTermination(t);
1214	>	assertFalse(l.isSignalled());
1215	>	}
1216	>
1217	>	/**
1218	>	* awaitNanos/timed await with 0 wait times out immediately
1219	>	*/
1220	>	public void testAwait_Zero() throws InterruptedException {
1221	>	final Mutex sync = new Mutex();
1222	>	final ConditionObject c = sync.newCondition();
1223	>	sync.acquire();
1224	>	assertTrue(c.awaitNanos(0L) <= 0);
1225	>	assertFalse(c.await(0L, NANOSECONDS));
1226	>	sync.release();
1227	>	}
1228	>
1229	>	/**
1230	>	* awaitNanos/timed await with maximum negative wait times does not underflow
1231	>	*/
1232	>	public void testAwait_NegativeInfinity() throws InterruptedException {
1233	>	final Mutex sync = new Mutex();
1234	>	final ConditionObject c = sync.newCondition();
1235	>	sync.acquire();
1236	>	assertTrue(c.awaitNanos(Long.MIN_VALUE) <= 0);
1237	>	assertFalse(c.await(Long.MIN_VALUE, NANOSECONDS));
1238	>	sync.release();
1239		}
1240
716	–
1241		}

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