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Comparing jsr166/src/test/tck/AbstractQueuedSynchronizerTest.java (file contents):
Revision 1.13 by dl, Fri Jan 9 15:39:10 2004 UTC vs.
Revision 1.55 by jsr166, Sun May 14 02:20:48 2017 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	>	main(suite(), args);
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 ConditionObject newCondition() { return new ConditionObject(); }
70	<
71	<	public void lock() {
72	<	acquireExclusiveUninterruptibly(1);
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 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	>	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	>	* Awaits condition using the specified AwaitMethod.
212		*/
213	<	public void testHasContended() {
214	<	final Mutex lock = new Mutex();
215	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
216	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
217	<	try {
218	<	assertFalse(lock.hasContended());
219	<	lock.acquireExclusiveUninterruptibly(1);
220	<	t1.start();
221	<	Thread.sleep(SHORT_DELAY_MS);
222	<	assertTrue(lock.hasContended());
223	<	t2.start();
224	<	Thread.sleep(SHORT_DELAY_MS);
225	<	assertTrue(lock.hasContended());
226	<	t1.interrupt();
227	<	Thread.sleep(SHORT_DELAY_MS);
228	<	assertTrue(lock.hasContended());
229	<	lock.releaseExclusive(1);
230	<	Thread.sleep(SHORT_DELAY_MS);
231	<	assertTrue(lock.hasContended());
232	<	t1.join();
250	<	t2.join();
251	<	} catch(Exception e){
252	<	unexpectedException();
253	<	}
254	<	}
255	<
256	<	/**
257	<	* acquireExclusiveNanos 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();
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	>	default:
232	>	throw new AssertionError();
233		}
234		}
235
236	+	/**
237	+	* Checks that awaiting the given condition times out (using the
238	+	* default timeout duration).
239	+	*/
240	+	void assertAwaitTimesOut(ConditionObject c, AwaitMethod awaitMethod) {
241	+	final long timeoutMillis = timeoutMillis();
242	+	final long startTime;
243	+	try {
244	+	switch (awaitMethod) {
245	+	case awaitTimed:
246	+	startTime = System.nanoTime();
247	+	assertFalse(c.await(timeoutMillis, MILLISECONDS));
248	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
249	+	break;
250	+	case awaitNanos:
251	+	startTime = System.nanoTime();
252	+	long nanosTimeout = MILLISECONDS.toNanos(timeoutMillis);
253	+	long nanosRemaining = c.awaitNanos(nanosTimeout);
254	+	assertTrue(nanosRemaining <= 0);
255	+	assertTrue(nanosRemaining > -MILLISECONDS.toNanos(LONG_DELAY_MS));
256	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
257	+	break;
258	+	case awaitUntil:
259	+	// We shouldn't assume that nanoTime and currentTimeMillis
260	+	// use the same time source, so don't use nanoTime here.
261	+	java.util.Date delayedDate = delayedDate(timeoutMillis);
262	+	assertFalse(c.awaitUntil(delayedDate(timeoutMillis)));
263	+	assertTrue(new java.util.Date().getTime() >= delayedDate.getTime());
264	+	break;
265	+	default:
266	+	throw new UnsupportedOperationException();
267	+	}
268	+	} catch (InterruptedException ie) { threadUnexpectedException(ie); }
269	+	}
270
271		/**
272	<	* TryAcquireExclusive on a locked lock fails
273	<	*/
274	<	public void testTryAcquireExclusiveWhenLocked() {
275	<	final Mutex lock = new Mutex();
276	<	lock.acquireExclusiveUninterruptibly(1);
277	<	Thread t = new Thread(new Runnable() {
278	<	public void run() {
279	<	threadAssertFalse(lock.tryAcquireExclusive(1));
280	<	}
281	<	});
282	<	try {
283	<	t.start();
284	<	t.join();
285	<	lock.releaseExclusive(1);
286	<	} catch(Exception e){
287	<	unexpectedException();
288	<	}
289	<	}
290	<
291	<	/**
292	<	* acquireExclusiveNanos on a locked lock times out
293	<	*/
294	<	public void testAcquireExclusiveNanos_Timeout() {
295	<	final Mutex lock = new Mutex();
296	<	lock.acquireExclusiveUninterruptibly(1);
297	<	Thread t = new Thread(new Runnable() {
298	<	public void run() {
299	<	try {
300	<	threadAssertFalse(lock.acquireExclusiveNanos(1, 1000 * 1000));
301	<	} catch (Exception ex) {
302	<	threadUnexpectedException();
303	<	}
304	<	}
305	<	});
306	<	try {
307	<	t.start();
308	<	t.join();
309	<	lock.releaseExclusive(1);
310	<	} catch(Exception e){
311	<	unexpectedException();
312	<	}
313	<	}
314	<
315	<
272	>	* isHeldExclusively is false upon construction
273	>	*/
274	>	public void testIsHeldExclusively() {
275	>	Mutex sync = new Mutex();
276	>	assertFalse(sync.isHeldExclusively());
277	>	}
278	>
279	>	/**
280	>	* acquiring released sync succeeds
281	>	*/
282	>	public void testAcquire() {
283	>	Mutex sync = new Mutex();
284	>	sync.acquire();
285	>	assertTrue(sync.isHeldExclusively());
286	>	sync.release();
287	>	assertFalse(sync.isHeldExclusively());
288	>	}
289	>
290	>	/**
291	>	* tryAcquire on a released sync succeeds
292	>	*/
293	>	public void testTryAcquire() {
294	>	Mutex sync = new Mutex();
295	>	assertTrue(sync.tryAcquire());
296	>	assertTrue(sync.isHeldExclusively());
297	>	sync.release();
298	>	assertFalse(sync.isHeldExclusively());
299	>	}
300	>
301	>	/**
302	>	* hasQueuedThreads reports whether there are waiting threads
303	>	*/
304	>	public void testHasQueuedThreads() {
305	>	final Mutex sync = new Mutex();
306	>	assertFalse(sync.hasQueuedThreads());
307	>	sync.acquire();
308	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
309	>	waitForQueuedThread(sync, t1);
310	>	assertTrue(sync.hasQueuedThreads());
311	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
312	>	waitForQueuedThread(sync, t2);
313	>	assertTrue(sync.hasQueuedThreads());
314	>	t1.interrupt();
315	>	awaitTermination(t1);
316	>	assertTrue(sync.hasQueuedThreads());
317	>	sync.release();
318	>	awaitTermination(t2);
319	>	assertFalse(sync.hasQueuedThreads());
320	>	}
321	>
322	>	/**
323	>	* isQueued(null) throws NullPointerException
324	>	*/
325	>	public void testIsQueuedNPE() {
326	>	final Mutex sync = new Mutex();
327	>	try {
328	>	sync.isQueued(null);
329	>	shouldThrow();
330	>	} catch (NullPointerException success) {}
331	>	}
332	>
333	>	/**
334	>	* isQueued reports whether a thread is queued
335	>	*/
336	>	public void testIsQueued() {
337	>	final Mutex sync = new Mutex();
338	>	Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
339	>	Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
340	>	assertFalse(sync.isQueued(t1));
341	>	assertFalse(sync.isQueued(t2));
342	>	sync.acquire();
343	>	t1.start();
344	>	waitForQueuedThread(sync, t1);
345	>	assertTrue(sync.isQueued(t1));
346	>	assertFalse(sync.isQueued(t2));
347	>	t2.start();
348	>	waitForQueuedThread(sync, t2);
349	>	assertTrue(sync.isQueued(t1));
350	>	assertTrue(sync.isQueued(t2));
351	>	t1.interrupt();
352	>	awaitTermination(t1);
353	>	assertFalse(sync.isQueued(t1));
354	>	assertTrue(sync.isQueued(t2));
355	>	sync.release();
356	>	awaitTermination(t2);
357	>	assertFalse(sync.isQueued(t1));
358	>	assertFalse(sync.isQueued(t2));
359	>	}
360	>
361	>	/**
362	>	* getFirstQueuedThread returns first waiting thread or null if none
363	>	*/
364	>	public void testGetFirstQueuedThread() {
365	>	final Mutex sync = new Mutex();
366	>	assertNull(sync.getFirstQueuedThread());
367	>	sync.acquire();
368	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
369	>	waitForQueuedThread(sync, t1);
370	>	assertEquals(t1, sync.getFirstQueuedThread());
371	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
372	>	waitForQueuedThread(sync, t2);
373	>	assertEquals(t1, sync.getFirstQueuedThread());
374	>	t1.interrupt();
375	>	awaitTermination(t1);
376	>	assertEquals(t2, sync.getFirstQueuedThread());
377	>	sync.release();
378	>	awaitTermination(t2);
379	>	assertNull(sync.getFirstQueuedThread());
380	>	}
381	>
382	>	/**
383	>	* hasContended reports false if no thread has ever blocked, else true
384	>	*/
385	>	public void testHasContended() {
386	>	final Mutex sync = new Mutex();
387	>	assertFalse(sync.hasContended());
388	>	sync.acquire();
389	>	assertFalse(sync.hasContended());
390	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
391	>	waitForQueuedThread(sync, t1);
392	>	assertTrue(sync.hasContended());
393	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
394	>	waitForQueuedThread(sync, t2);
395	>	assertTrue(sync.hasContended());
396	>	t1.interrupt();
397	>	awaitTermination(t1);
398	>	assertTrue(sync.hasContended());
399	>	sync.release();
400	>	awaitTermination(t2);
401	>	assertTrue(sync.hasContended());
402	>	}
403	>
404	>	/**
405	>	* getQueuedThreads returns all waiting threads
406	>	*/
407	>	public void testGetQueuedThreads() {
408	>	final Mutex sync = new Mutex();
409	>	Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
410	>	Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
411	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
412	>	sync.acquire();
413	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
414	>	t1.start();
415	>	waitForQueuedThread(sync, t1);
416	>	assertHasExclusiveQueuedThreads(sync, t1);
417	>	assertTrue(sync.getQueuedThreads().contains(t1));
418	>	assertFalse(sync.getQueuedThreads().contains(t2));
419	>	t2.start();
420	>	waitForQueuedThread(sync, t2);
421	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
422	>	assertTrue(sync.getQueuedThreads().contains(t1));
423	>	assertTrue(sync.getQueuedThreads().contains(t2));
424	>	t1.interrupt();
425	>	awaitTermination(t1);
426	>	assertHasExclusiveQueuedThreads(sync, t2);
427	>	sync.release();
428	>	awaitTermination(t2);
429	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
430	>	}
431	>
432	>	/**
433	>	* getExclusiveQueuedThreads returns all exclusive waiting threads
434	>	*/
435	>	public void testGetExclusiveQueuedThreads() {
436	>	final Mutex sync = new Mutex();
437	>	Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
438	>	Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
439	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
440	>	sync.acquire();
441	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
442	>	t1.start();
443	>	waitForQueuedThread(sync, t1);
444	>	assertHasExclusiveQueuedThreads(sync, t1);
445	>	assertTrue(sync.getExclusiveQueuedThreads().contains(t1));
446	>	assertFalse(sync.getExclusiveQueuedThreads().contains(t2));
447	>	t2.start();
448	>	waitForQueuedThread(sync, t2);
449	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
450	>	assertTrue(sync.getExclusiveQueuedThreads().contains(t1));
451	>	assertTrue(sync.getExclusiveQueuedThreads().contains(t2));
452	>	t1.interrupt();
453	>	awaitTermination(t1);
454	>	assertHasExclusiveQueuedThreads(sync, t2);
455	>	sync.release();
456	>	awaitTermination(t2);
457	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
458	>	}
459	>
460	>	/**
461	>	* getSharedQueuedThreads does not include exclusively waiting threads
462	>	*/
463	>	public void testGetSharedQueuedThreads_Exclusive() {
464	>	final Mutex sync = new Mutex();
465	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
466	>	sync.acquire();
467	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
468	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
469	>	waitForQueuedThread(sync, t1);
470	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
471	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
472	>	waitForQueuedThread(sync, t2);
473	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
474	>	t1.interrupt();
475	>	awaitTermination(t1);
476	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
477	>	sync.release();
478	>	awaitTermination(t2);
479	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
480	>	}
481	>
482	>	/**
483	>	* getSharedQueuedThreads returns all shared waiting threads
484	>	*/
485	>	public void testGetSharedQueuedThreads_Shared() {
486	>	final BooleanLatch l = new BooleanLatch();
487	>	assertHasSharedQueuedThreads(l, NO_THREADS);
488	>	Thread t1 = newStartedThread(new CheckedInterruptedRunnable() {
489	>	public void realRun() throws InterruptedException {
490	>	l.acquireSharedInterruptibly(0);
491	>	}});
492	>	waitForQueuedThread(l, t1);
493	>	assertHasSharedQueuedThreads(l, t1);
494	>	Thread t2 = newStartedThread(new CheckedRunnable() {
495	>	public void realRun() throws InterruptedException {
496	>	l.acquireSharedInterruptibly(0);
497	>	}});
498	>	waitForQueuedThread(l, t2);
499	>	assertHasSharedQueuedThreads(l, t1, t2);
500	>	t1.interrupt();
501	>	awaitTermination(t1);
502	>	assertHasSharedQueuedThreads(l, t2);
503	>	assertTrue(l.releaseShared(0));
504	>	awaitTermination(t2);
505	>	assertHasSharedQueuedThreads(l, NO_THREADS);
506	>	}
507	>
508	>	/**
509	>	* tryAcquireNanos is interruptible
510	>	*/
511	>	public void testTryAcquireNanos_Interruptible() {
512	>	final Mutex sync = new Mutex();
513	>	sync.acquire();
514	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
515	>	public void realRun() throws InterruptedException {
516	>	sync.tryAcquireNanos(MILLISECONDS.toNanos(2 * LONG_DELAY_MS));
517	>	}});
518	>
519	>	waitForQueuedThread(sync, t);
520	>	t.interrupt();
521	>	awaitTermination(t);
522	>	}
523	>
524	>	/**
525	>	* tryAcquire on exclusively held sync fails
526	>	*/
527	>	public void testTryAcquireWhenSynced() {
528	>	final Mutex sync = new Mutex();
529	>	sync.acquire();
530	>	Thread t = newStartedThread(new CheckedRunnable() {
531	>	public void realRun() {
532	>	assertFalse(sync.tryAcquire());
533	>	}});
534	>
535	>	awaitTermination(t);
536	>	sync.release();
537	>	}
538	>
539	>	/**
540	>	* tryAcquireNanos on an exclusively held sync times out
541	>	*/
542	>	public void testAcquireNanos_Timeout() {
543	>	final Mutex sync = new Mutex();
544	>	sync.acquire();
545	>	Thread t = newStartedThread(new CheckedRunnable() {
546	>	public void realRun() throws InterruptedException {
547	>	long startTime = System.nanoTime();
548	>	long nanos = MILLISECONDS.toNanos(timeoutMillis());
549	>	assertFalse(sync.tryAcquireNanos(nanos));
550	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
551	>	}});
552	>
553	>	awaitTermination(t);
554	>	sync.release();
555	>	}
556	>
557		/**
558		* getState is true when acquired and false when not
559		*/
560		public void testGetState() {
561	<	final Mutex lock = new Mutex();
562	<	lock.acquireExclusiveUninterruptibly(1);
563	<	assertTrue(lock.isLocked());
564	<	lock.releaseExclusive(1);
565	<	assertFalse(lock.isLocked());
566	<	Thread t = new Thread(new Runnable() {
567	<	public void run() {
568	<	lock.acquireExclusiveUninterruptibly(1);
569	<	try {
570	<	Thread.sleep(SMALL_DELAY_MS);
571	<	}
572	<	catch(Exception e) {
573	<	threadUnexpectedException();
574	<	}
575	<	lock.releaseExclusive(1);
576	<	}
577	<	});
578	<	try {
579	<	t.start();
580	<	Thread.sleep(SHORT_DELAY_MS);
581	<	assertTrue(lock.isLocked());
349	<	t.join();
350	<	assertFalse(lock.isLocked());
351	<	} catch(Exception e){
352	<	unexpectedException();
353	<	}
561	>	final Mutex sync = new Mutex();
562	>	sync.acquire();
563	>	assertTrue(sync.isHeldExclusively());
564	>	sync.release();
565	>	assertFalse(sync.isHeldExclusively());
566	>
567	>	final BooleanLatch acquired = new BooleanLatch();
568	>	final BooleanLatch done = new BooleanLatch();
569	>	Thread t = newStartedThread(new CheckedRunnable() {
570	>	public void realRun() throws InterruptedException {
571	>	sync.acquire();
572	>	assertTrue(acquired.releaseShared(0));
573	>	done.acquireShared(0);
574	>	sync.release();
575	>	}});
576	>
577	>	acquired.acquireShared(0);
578	>	assertTrue(sync.isHeldExclusively());
579	>	assertTrue(done.releaseShared(0));
580	>	awaitTermination(t);
581	>	assertFalse(sync.isHeldExclusively());
582		}
583
584	+	/**
585	+	* acquireInterruptibly succeeds when released, else is interruptible
586	+	*/
587	+	public void testAcquireInterruptibly() throws InterruptedException {
588	+	final Mutex sync = new Mutex();
589	+	final BooleanLatch threadStarted = new BooleanLatch();
590	+	sync.acquireInterruptibly();
591	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
592	+	public void realRun() throws InterruptedException {
593	+	assertTrue(threadStarted.releaseShared(0));
594	+	sync.acquireInterruptibly();
595	+	}});
596	+
597	+	threadStarted.acquireShared(0);
598	+	waitForQueuedThread(sync, t);
599	+	t.interrupt();
600	+	awaitTermination(t);
601	+	assertTrue(sync.isHeldExclusively());
602	+	}
603
604		/**
605	<	* acquireExclusiveInterruptibly is interruptible.
606	<	*/
607	<	public void testAcquireInterruptibly1() {
608	<	final Mutex lock = new Mutex();
609	<	lock.acquireExclusiveUninterruptibly(1);
610	<	Thread t = new Thread(new InterruptedLockRunnable(lock));
611	<	try {
612	<	t.start();
613	<	t.interrupt();
614	<	lock.releaseExclusive(1);
615	<	t.join();
616	<	} catch(Exception e){
617	<	unexpectedException();
618	<	}
619	<	}
620	<
621	<	/**
622	<	* acquireExclusiveInterruptibly succeeds when released, else is interruptible
623	<	*/
624	<	public void testAcquireInterruptibly2() {
625	<	final Mutex lock = new Mutex();
626	<	try {
627	<	lock.acquireExclusiveInterruptibly(1);
628	<	} 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();
605	>	* owns is true for a condition created by sync else false
606	>	*/
607	>	public void testOwns() {
608	>	final Mutex sync = new Mutex();
609	>	final ConditionObject c = sync.newCondition();
610	>	final Mutex sync2 = new Mutex();
611	>	assertTrue(sync.owns(c));
612	>	assertFalse(sync2.owns(c));
613	>	}
614	>
615	>	/**
616	>	* Calling await without holding sync throws IllegalMonitorStateException
617	>	*/
618	>	public void testAwait_IMSE() {
619	>	final Mutex sync = new Mutex();
620	>	final ConditionObject c = sync.newCondition();
621	>	for (AwaitMethod awaitMethod : AwaitMethod.values()) {
622	>	long startTime = System.nanoTime();
623	>	try {
624	>	await(c, awaitMethod);
625	>	shouldThrow();
626	>	} catch (IllegalMonitorStateException success) {
627	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
628	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
629		}
630		}
631
632		/**
633	<	* owns is true for a condition created by lock else false
633	>	* Calling signal without holding sync throws IllegalMonitorStateException
634		*/
635	<	public void testOwns() {
636	<	final Mutex lock = new Mutex();
637	<	final AbstractQueuedSynchronizer.ConditionObject c = lock.newCondition();
638	<	final Mutex lock2 = new Mutex();
639	<	assertTrue(lock.owns(c));
640	<	assertFalse(lock2.owns(c));
635	>	public void testSignal_IMSE() {
636	>	final Mutex sync = new Mutex();
637	>	final ConditionObject c = sync.newCondition();
638	>	try {
639	>	c.signal();
640	>	shouldThrow();
641	>	} catch (IllegalMonitorStateException success) {}
642	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
643		}
644
645		/**
646	<	* Calling await without holding lock throws IllegalMonitorStateException
646	>	* Calling signalAll without holding sync throws IllegalMonitorStateException
647		*/
648	<	public void testAwait_IllegalMonitor() {
649	<	final Mutex lock = new Mutex();
650	<	final Condition c = lock.newCondition();
648	>	public void testSignalAll_IMSE() {
649	>	final Mutex sync = new Mutex();
650	>	final ConditionObject c = sync.newCondition();
651		try {
652	<	c.await();
652	>	c.signalAll();
653		shouldThrow();
654	<	}
655	<	catch (IllegalMonitorStateException success) {
656	<	}
657	<	catch (Exception ex) {
658	<	unexpectedException();
659	<	}
654	>	} catch (IllegalMonitorStateException success) {}
655	>	}
656	>
657	>	/**
658	>	* await/awaitNanos/awaitUntil without a signal times out
659	>	*/
660	>	public void testAwaitTimed_Timeout() { testAwait_Timeout(AwaitMethod.awaitTimed); }
661	>	public void testAwaitNanos_Timeout() { testAwait_Timeout(AwaitMethod.awaitNanos); }
662	>	public void testAwaitUntil_Timeout() { testAwait_Timeout(AwaitMethod.awaitUntil); }
663	>	public void testAwait_Timeout(AwaitMethod awaitMethod) {
664	>	final Mutex sync = new Mutex();
665	>	final ConditionObject c = sync.newCondition();
666	>	sync.acquire();
667	>	assertAwaitTimesOut(c, awaitMethod);
668	>	sync.release();
669	>	}
670	>
671	>	/**
672	>	* await/awaitNanos/awaitUntil returns when signalled
673	>	*/
674	>	public void testSignal_await()      { testSignal(AwaitMethod.await); }
675	>	public void testSignal_awaitTimed() { testSignal(AwaitMethod.awaitTimed); }
676	>	public void testSignal_awaitNanos() { testSignal(AwaitMethod.awaitNanos); }
677	>	public void testSignal_awaitUntil() { testSignal(AwaitMethod.awaitUntil); }
678	>	public void testSignal(final AwaitMethod awaitMethod) {
679	>	final Mutex sync = new Mutex();
680	>	final ConditionObject c = sync.newCondition();
681	>	final BooleanLatch acquired = new BooleanLatch();
682	>	Thread t = newStartedThread(new CheckedRunnable() {
683	>	public void realRun() throws InterruptedException {
684	>	sync.acquire();
685	>	assertTrue(acquired.releaseShared(0));
686	>	await(c, awaitMethod);
687	>	sync.release();
688	>	}});
689	>
690	>	acquired.acquireShared(0);
691	>	sync.acquire();
692	>	assertHasWaitersLocked(sync, c, t);
693	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
694	>	c.signal();
695	>	assertHasWaitersLocked(sync, c, NO_THREADS);
696	>	assertHasExclusiveQueuedThreads(sync, t);
697	>	sync.release();
698	>	awaitTermination(t);
699		}
700
701		/**
702	<	* Calling signal without holding lock throws IllegalMonitorStateException
702	>	* hasWaiters(null) throws NullPointerException
703		*/
704	<	public void testSignal_IllegalMonitor() {
705	<	final Mutex lock = new Mutex();
428	<	final Condition c = lock.newCondition();
704	>	public void testHasWaitersNPE() {
705	>	final Mutex sync = new Mutex();
706		try {
707	<	c.signal();
707	>	sync.hasWaiters(null);
708		shouldThrow();
709	<	}
433	<	catch (IllegalMonitorStateException success) {
434	<	}
435	<	catch (Exception ex) {
436	<	unexpectedException();
437	<	}
709	>	} catch (NullPointerException success) {}
710		}
711
712		/**
713	<	* awaitNanos without a signal times out
713	>	* getWaitQueueLength(null) throws NullPointerException
714		*/
715	<	public void testAwaitNanos_Timeout() {
716	<	final Mutex lock = new Mutex();
445	<	final Condition c = lock.newCondition();
715	>	public void testGetWaitQueueLengthNPE() {
716	>	final Mutex sync = new Mutex();
717		try {
718	<	lock.acquireExclusiveUninterruptibly(1);
719	<	long t = c.awaitNanos(100);
720	<	assertTrue(t <= 0);
450	<	lock.releaseExclusive(1);
451	<	}
452	<	catch (Exception ex) {
453	<	unexpectedException();
454	<	}
718	>	sync.getWaitQueueLength(null);
719	>	shouldThrow();
720	>	} catch (NullPointerException success) {}
721		}
722
723		/**
724	<	*  timed await without a signal times out
724	>	* getWaitingThreads(null) throws NullPointerException
725		*/
726	<	public void testAwait_Timeout() {
727	<	final Mutex lock = new Mutex();
462	<	final Condition c = lock.newCondition();
726	>	public void testGetWaitingThreadsNPE() {
727	>	final Mutex sync = new Mutex();
728		try {
729	<	lock.acquireExclusiveUninterruptibly(1);
730	<	assertFalse(c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
731	<	lock.releaseExclusive(1);
467	<	}
468	<	catch (Exception ex) {
469	<	unexpectedException();
470	<	}
729	>	sync.getWaitingThreads(null);
730	>	shouldThrow();
731	>	} catch (NullPointerException success) {}
732		}
733
734		/**
735	<	* awaitUntil without a signal times out
735	>	* hasWaiters throws IllegalArgumentException if not owned
736		*/
737	<	public void testAwaitUntil_Timeout() {
738	<	final Mutex lock = new Mutex();
739	<	final Condition c = lock.newCondition();
737	>	public void testHasWaitersIAE() {
738	>	final Mutex sync = new Mutex();
739	>	final ConditionObject c = sync.newCondition();
740	>	final Mutex sync2 = new Mutex();
741		try {
742	<	lock.acquireExclusiveUninterruptibly(1);
743	<	java.util.Date d = new java.util.Date();
744	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
745	<	lock.releaseExclusive(1);
746	<	}
747	<	catch (Exception ex) {
748	<	unexpectedException();
749	<	}
742	>	sync2.hasWaiters(c);
743	>	shouldThrow();
744	>	} catch (IllegalArgumentException success) {}
745	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
746	>	}
747	>
748	>	/**
749	>	* hasWaiters throws IllegalMonitorStateException if not synced
750	>	*/
751	>	public void testHasWaitersIMSE() {
752	>	final Mutex sync = new Mutex();
753	>	final ConditionObject c = sync.newCondition();
754	>	try {
755	>	sync.hasWaiters(c);
756	>	shouldThrow();
757	>	} catch (IllegalMonitorStateException success) {}
758	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
759		}
760
761		/**
762	<	* await returns when signalled
762	>	* getWaitQueueLength throws IllegalArgumentException if not owned
763		*/
764	<	public void testAwait() {
765	<	final Mutex lock = new Mutex();
766	<	final Condition c = lock.newCondition();
767	<	Thread t = new Thread(new Runnable() {
768	<	public void run() {
769	<	try {
770	<	lock.acquireExclusiveUninterruptibly(1);
771	<	c.await();
772	<	lock.releaseExclusive(1);
773	<	}
503	<	catch(InterruptedException e) {
504	<	threadUnexpectedException();
505	<	}
506	<	}
507	<	});
764	>	public void testGetWaitQueueLengthIAE() {
765	>	final Mutex sync = new Mutex();
766	>	final ConditionObject c = sync.newCondition();
767	>	final Mutex sync2 = new Mutex();
768	>	try {
769	>	sync2.getWaitQueueLength(c);
770	>	shouldThrow();
771	>	} catch (IllegalArgumentException success) {}
772	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
773	>	}
774
775	+	/**
776	+	* getWaitQueueLength throws IllegalMonitorStateException if not synced
777	+	*/
778	+	public void testGetWaitQueueLengthIMSE() {
779	+	final Mutex sync = new Mutex();
780	+	final ConditionObject c = sync.newCondition();
781		try {
782	<	t.start();
783	<	Thread.sleep(SHORT_DELAY_MS);
784	<	lock.acquireExclusiveUninterruptibly(1);
785	<	c.signal();
786	<	lock.releaseExclusive(1);
787	<	t.join(SHORT_DELAY_MS);
788	<	assertFalse(t.isAlive());
789	<	}
790	<	catch (Exception ex) {
791	<	unexpectedException();
792	<	}
782	>	sync.getWaitQueueLength(c);
783	>	shouldThrow();
784	>	} catch (IllegalMonitorStateException success) {}
785	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
786	>	}
787	>
788	>	/**
789	>	* getWaitingThreads throws IllegalArgumentException if not owned
790	>	*/
791	>	public void testGetWaitingThreadsIAE() {
792	>	final Mutex sync = new Mutex();
793	>	final ConditionObject c = sync.newCondition();
794	>	final Mutex sync2 = new Mutex();
795	>	try {
796	>	sync2.getWaitingThreads(c);
797	>	shouldThrow();
798	>	} catch (IllegalArgumentException success) {}
799	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
800	>	}
801	>
802	>	/**
803	>	* getWaitingThreads throws IllegalMonitorStateException if not synced
804	>	*/
805	>	public void testGetWaitingThreadsIMSE() {
806	>	final Mutex sync = new Mutex();
807	>	final ConditionObject c = sync.newCondition();
808	>	try {
809	>	sync.getWaitingThreads(c);
810	>	shouldThrow();
811	>	} catch (IllegalMonitorStateException success) {}
812	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
813		}
814
815	+	/**
816	+	* hasWaiters returns true when a thread is waiting, else false
817	+	*/
818	+	public void testHasWaiters() {
819	+	final Mutex sync = new Mutex();
820	+	final ConditionObject c = sync.newCondition();
821	+	final BooleanLatch acquired = new BooleanLatch();
822	+	Thread t = newStartedThread(new CheckedRunnable() {
823	+	public void realRun() throws InterruptedException {
824	+	sync.acquire();
825	+	assertHasWaitersLocked(sync, c, NO_THREADS);
826	+	assertFalse(sync.hasWaiters(c));
827	+	assertTrue(acquired.releaseShared(0));
828	+	c.await();
829	+	sync.release();
830	+	}});
831	+
832	+	acquired.acquireShared(0);
833	+	sync.acquire();
834	+	assertHasWaitersLocked(sync, c, t);
835	+	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
836	+	assertTrue(sync.hasWaiters(c));
837	+	c.signal();
838	+	assertHasWaitersLocked(sync, c, NO_THREADS);
839	+	assertHasExclusiveQueuedThreads(sync, t);
840	+	assertFalse(sync.hasWaiters(c));
841	+	sync.release();
842	+
843	+	awaitTermination(t);
844	+	assertHasWaitersUnlocked(sync, c, NO_THREADS);
845	+	}
846	+
847	+	/**
848	+	* getWaitQueueLength returns number of waiting threads
849	+	*/
850	+	public void testGetWaitQueueLength() {
851	+	final Mutex sync = new Mutex();
852	+	final ConditionObject c = sync.newCondition();
853	+	final BooleanLatch acquired1 = new BooleanLatch();
854	+	final BooleanLatch acquired2 = new BooleanLatch();
855	+	final Thread t1 = newStartedThread(new CheckedRunnable() {
856	+	public void realRun() throws InterruptedException {
857	+	sync.acquire();
858	+	assertHasWaitersLocked(sync, c, NO_THREADS);
859	+	assertEquals(0, sync.getWaitQueueLength(c));
860	+	assertTrue(acquired1.releaseShared(0));
861	+	c.await();
862	+	sync.release();
863	+	}});
864	+	acquired1.acquireShared(0);
865	+	sync.acquire();
866	+	assertHasWaitersLocked(sync, c, t1);
867	+	assertEquals(1, sync.getWaitQueueLength(c));
868	+	sync.release();
869	+
870	+	final Thread t2 = newStartedThread(new CheckedRunnable() {
871	+	public void realRun() throws InterruptedException {
872	+	sync.acquire();
873	+	assertHasWaitersLocked(sync, c, t1);
874	+	assertEquals(1, sync.getWaitQueueLength(c));
875	+	assertTrue(acquired2.releaseShared(0));
876	+	c.await();
877	+	sync.release();
878	+	}});
879	+	acquired2.acquireShared(0);
880	+	sync.acquire();
881	+	assertHasWaitersLocked(sync, c, t1, t2);
882	+	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
883	+	assertEquals(2, sync.getWaitQueueLength(c));
884	+	c.signalAll();
885	+	assertHasWaitersLocked(sync, c, NO_THREADS);
886	+	assertHasExclusiveQueuedThreads(sync, t1, t2);
887	+	assertEquals(0, sync.getWaitQueueLength(c));
888	+	sync.release();
889	+
890	+	awaitTermination(t1);
891	+	awaitTermination(t2);
892	+	assertHasWaitersUnlocked(sync, c, NO_THREADS);
893	+	}
894	+
895	+	/**
896	+	* getWaitingThreads returns only and all waiting threads
897	+	*/
898	+	public void testGetWaitingThreads() {
899	+	final Mutex sync = new Mutex();
900	+	final ConditionObject c = sync.newCondition();
901	+	final BooleanLatch acquired1 = new BooleanLatch();
902	+	final BooleanLatch acquired2 = new BooleanLatch();
903	+	final Thread t1 = new Thread(new CheckedRunnable() {
904	+	public void realRun() throws InterruptedException {
905	+	sync.acquire();
906	+	assertHasWaitersLocked(sync, c, NO_THREADS);
907	+	assertTrue(sync.getWaitingThreads(c).isEmpty());
908	+	assertTrue(acquired1.releaseShared(0));
909	+	c.await();
910	+	sync.release();
911	+	}});
912	+
913	+	final Thread t2 = new Thread(new CheckedRunnable() {
914	+	public void realRun() throws InterruptedException {
915	+	sync.acquire();
916	+	assertHasWaitersLocked(sync, c, t1);
917	+	assertTrue(sync.getWaitingThreads(c).contains(t1));
918	+	assertFalse(sync.getWaitingThreads(c).isEmpty());
919	+	assertEquals(1, sync.getWaitingThreads(c).size());
920	+	assertTrue(acquired2.releaseShared(0));
921	+	c.await();
922	+	sync.release();
923	+	}});
924	+
925	+	sync.acquire();
926	+	assertHasWaitersLocked(sync, c, NO_THREADS);
927	+	assertFalse(sync.getWaitingThreads(c).contains(t1));
928	+	assertFalse(sync.getWaitingThreads(c).contains(t2));
929	+	assertTrue(sync.getWaitingThreads(c).isEmpty());
930	+	assertEquals(0, sync.getWaitingThreads(c).size());
931	+	sync.release();
932	+
933	+	t1.start();
934	+	acquired1.acquireShared(0);
935	+	sync.acquire();
936	+	assertHasWaitersLocked(sync, c, t1);
937	+	assertTrue(sync.getWaitingThreads(c).contains(t1));
938	+	assertFalse(sync.getWaitingThreads(c).contains(t2));
939	+	assertFalse(sync.getWaitingThreads(c).isEmpty());
940	+	assertEquals(1, sync.getWaitingThreads(c).size());
941	+	sync.release();
942	+
943	+	t2.start();
944	+	acquired2.acquireShared(0);
945	+	sync.acquire();
946	+	assertHasWaitersLocked(sync, c, t1, t2);
947	+	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
948	+	assertTrue(sync.getWaitingThreads(c).contains(t1));
949	+	assertTrue(sync.getWaitingThreads(c).contains(t2));
950	+	assertFalse(sync.getWaitingThreads(c).isEmpty());
951	+	assertEquals(2, sync.getWaitingThreads(c).size());
952	+	c.signalAll();
953	+	assertHasWaitersLocked(sync, c, NO_THREADS);
954	+	assertHasExclusiveQueuedThreads(sync, t1, t2);
955	+	assertFalse(sync.getWaitingThreads(c).contains(t1));
956	+	assertFalse(sync.getWaitingThreads(c).contains(t2));
957	+	assertTrue(sync.getWaitingThreads(c).isEmpty());
958	+	assertEquals(0, sync.getWaitingThreads(c).size());
959	+	sync.release();
960	+
961	+	awaitTermination(t1);
962	+	awaitTermination(t2);
963	+	assertHasWaitersUnlocked(sync, c, NO_THREADS);
964	+	}
965	+
966	+	/**
967	+	* awaitUninterruptibly is uninterruptible
968	+	*/
969	+	public void testAwaitUninterruptibly() {
970	+	final Mutex sync = new Mutex();
971	+	final ConditionObject condition = sync.newCondition();
972	+	final BooleanLatch pleaseInterrupt = new BooleanLatch();
973	+	Thread t = newStartedThread(new CheckedRunnable() {
974	+	public void realRun() {
975	+	sync.acquire();
976	+	assertTrue(pleaseInterrupt.releaseShared(0));
977	+	condition.awaitUninterruptibly();
978	+	assertTrue(Thread.interrupted());
979	+	assertHasWaitersLocked(sync, condition, NO_THREADS);
980	+	sync.release();
981	+	}});
982	+
983	+	pleaseInterrupt.acquireShared(0);
984	+	sync.acquire();
985	+	assertHasWaitersLocked(sync, condition, t);
986	+	sync.release();
987	+	t.interrupt();
988	+	assertHasWaitersUnlocked(sync, condition, t);
989	+	assertThreadBlocks(t, Thread.State.WAITING);
990	+	sync.acquire();
991	+	assertHasWaitersLocked(sync, condition, t);
992	+	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
993	+	condition.signal();
994	+	assertHasWaitersLocked(sync, condition, NO_THREADS);
995	+	assertHasExclusiveQueuedThreads(sync, t);
996	+	sync.release();
997	+	awaitTermination(t);
998	+	}
999	+
1000	+	/**
1001	+	* await/awaitNanos/awaitUntil is interruptible
1002	+	*/
1003	+	public void testInterruptible_await()      { testInterruptible(AwaitMethod.await); }
1004	+	public void testInterruptible_awaitTimed() { testInterruptible(AwaitMethod.awaitTimed); }
1005	+	public void testInterruptible_awaitNanos() { testInterruptible(AwaitMethod.awaitNanos); }
1006	+	public void testInterruptible_awaitUntil() { testInterruptible(AwaitMethod.awaitUntil); }
1007	+	public void testInterruptible(final AwaitMethod awaitMethod) {
1008	+	final Mutex sync = new Mutex();
1009	+	final ConditionObject c = sync.newCondition();
1010	+	final BooleanLatch pleaseInterrupt = new BooleanLatch();
1011	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1012	+	public void realRun() throws InterruptedException {
1013	+	sync.acquire();
1014	+	assertTrue(pleaseInterrupt.releaseShared(0));
1015	+	await(c, awaitMethod);
1016	+	}});
1017	+
1018	+	pleaseInterrupt.acquireShared(0);
1019	+	t.interrupt();
1020	+	awaitTermination(t);
1021	+	}
1022	+
1023	+	/**
1024	+	* signalAll wakes up all threads
1025	+	*/
1026	+	public void testSignalAll_await()      { testSignalAll(AwaitMethod.await); }
1027	+	public void testSignalAll_awaitTimed() { testSignalAll(AwaitMethod.awaitTimed); }
1028	+	public void testSignalAll_awaitNanos() { testSignalAll(AwaitMethod.awaitNanos); }
1029	+	public void testSignalAll_awaitUntil() { testSignalAll(AwaitMethod.awaitUntil); }
1030	+	public void testSignalAll(final AwaitMethod awaitMethod) {
1031	+	final Mutex sync = new Mutex();
1032	+	final ConditionObject c = sync.newCondition();
1033	+	final BooleanLatch acquired1 = new BooleanLatch();
1034	+	final BooleanLatch acquired2 = new BooleanLatch();
1035	+	Thread t1 = newStartedThread(new CheckedRunnable() {
1036	+	public void realRun() throws InterruptedException {
1037	+	sync.acquire();
1038	+	acquired1.releaseShared(0);
1039	+	await(c, awaitMethod);
1040	+	sync.release();
1041	+	}});
1042	+
1043	+	Thread t2 = newStartedThread(new CheckedRunnable() {
1044	+	public void realRun() throws InterruptedException {
1045	+	sync.acquire();
1046	+	acquired2.releaseShared(0);
1047	+	await(c, awaitMethod);
1048	+	sync.release();
1049	+	}});
1050	+
1051	+	acquired1.acquireShared(0);
1052	+	acquired2.acquireShared(0);
1053	+	sync.acquire();
1054	+	assertHasWaitersLocked(sync, c, t1, t2);
1055	+	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
1056	+	c.signalAll();
1057	+	assertHasWaitersLocked(sync, c, NO_THREADS);
1058	+	assertHasExclusiveQueuedThreads(sync, t1, t2);
1059	+	sync.release();
1060	+	awaitTermination(t1);
1061	+	awaitTermination(t2);
1062	+	}
1063	+
1064	+	/**
1065	+	* toString indicates current state
1066	+	*/
1067	+	public void testToString() {
1068	+	Mutex sync = new Mutex();
1069	+	assertTrue(sync.toString().contains("State = " + Mutex.UNLOCKED));
1070	+	sync.acquire();
1071	+	assertTrue(sync.toString().contains("State = " + Mutex.LOCKED));
1072	+	}
1073	+
1074	+	/**
1075	+	* A serialized AQS deserializes with current state, but no queued threads
1076	+	*/
1077	+	public void testSerialization() {
1078	+	Mutex sync = new Mutex();
1079	+	assertFalse(serialClone(sync).isHeldExclusively());
1080	+	sync.acquire();
1081	+	Thread t = newStartedThread(new InterruptedSyncRunnable(sync));
1082	+	waitForQueuedThread(sync, t);
1083	+	assertTrue(sync.isHeldExclusively());
1084	+
1085	+	Mutex clone = serialClone(sync);
1086	+	assertTrue(clone.isHeldExclusively());
1087	+	assertHasExclusiveQueuedThreads(sync, t);
1088	+	assertHasExclusiveQueuedThreads(clone, NO_THREADS);
1089	+	t.interrupt();
1090	+	awaitTermination(t);
1091	+	sync.release();
1092	+	assertFalse(sync.isHeldExclusively());
1093	+	assertTrue(clone.isHeldExclusively());
1094	+	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
1095	+	assertHasExclusiveQueuedThreads(clone, NO_THREADS);
1096	+	}
1097
1098		/**
1099	<	* Latch isSignalled initially returns false, then true after release
1099	>	* tryReleaseShared setting state changes getState
1100		*/
1101	<	public void testLatchIsSignalled() {
1102	<	final BooleanLatch l = new BooleanLatch();
1103	<	assertFalse(l.isSignalled());
1104	<	l.releaseShared(0);
1105	<	assertTrue(l.isSignalled());
1101	>	public void testGetStateWithReleaseShared() {
1102	>	final BooleanLatch l = new BooleanLatch();
1103	>	assertFalse(l.isSignalled());
1104	>	assertTrue(l.releaseShared(0));
1105	>	assertTrue(l.isSignalled());
1106		}
1107
1108		/**
1109	<	* release and has no effect when already signalled
1109	>	* releaseShared has no effect when already signalled
1110		*/
1111		public void testReleaseShared() {
1112	<	final BooleanLatch l = new BooleanLatch();
1113	<	assertFalse(l.isSignalled());
1114	<	l.releaseShared(0);
1115	<	assertTrue(l.isSignalled());
1116	<	l.releaseShared(0);
1117	<	assertTrue(l.isSignalled());
1112	>	final BooleanLatch l = new BooleanLatch();
1113	>	assertFalse(l.isSignalled());
1114	>	assertTrue(l.releaseShared(0));
1115	>	assertTrue(l.isSignalled());
1116	>	assertTrue(l.releaseShared(0));
1117	>	assertTrue(l.isSignalled());
1118		}
1119
1120		/**
1121		* acquireSharedInterruptibly returns after release, but not before
1122		*/
1123		public void testAcquireSharedInterruptibly() {
1124	<	final BooleanLatch l = new BooleanLatch();
1124	>	final BooleanLatch l = new BooleanLatch();
1125
1126	<	Thread t = new Thread(new Runnable() {
1127	<	public void run() {
1128	<	try {
1129	<	threadAssertFalse(l.isSignalled());
1130	<	l.acquireSharedInterruptibly(0);
1131	<	threadAssertTrue(l.isSignalled());
1132	<	} catch(InterruptedException e){
1133	<	threadUnexpectedException();
1134	<	}
1135	<	}
1136	<	});
1137	<	try {
1138	<	t.start();
1139	<	assertFalse(l.isSignalled());
1140	<	Thread.sleep(SHORT_DELAY_MS);
1141	<	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 testAsquireSharedTimed() {
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	<	}
1126	>	Thread t = newStartedThread(new CheckedRunnable() {
1127	>	public void realRun() throws InterruptedException {
1128	>	assertFalse(l.isSignalled());
1129	>	l.acquireSharedInterruptibly(0);
1130	>	assertTrue(l.isSignalled());
1131	>	l.acquireSharedInterruptibly(0);
1132	>	assertTrue(l.isSignalled());
1133	>	}});
1134	>
1135	>	waitForQueuedThread(l, t);
1136	>	assertFalse(l.isSignalled());
1137	>	assertThreadBlocks(t, Thread.State.WAITING);
1138	>	assertHasSharedQueuedThreads(l, t);
1139	>	assertTrue(l.releaseShared(0));
1140	>	assertTrue(l.isSignalled());
1141	>	awaitTermination(t);
1142		}
1143	<
1143	>
1144		/**
1145	<	* acquireSharedInterruptibly throws IE if interrupted before released
1145	>	* tryAcquireSharedNanos returns after release, but not before
1146		*/
1147	<	public void testAcquireSharedInterruptibly_InterruptedException() {
1147	>	public void testTryAcquireSharedNanos() {
1148		final BooleanLatch l = new BooleanLatch();
1149	<	Thread t = new Thread(new Runnable() {
1150	<	public void run() {
1151	<	try {
1152	<	threadAssertFalse(l.isSignalled());
1153	<	l.acquireSharedInterruptibly(0);
1154	<	threadShouldThrow();
1155	<	} catch(InterruptedException success){}
1156	<	}
1157	<	});
1158	<	t.start();
1159	<	try {
1160	<	assertFalse(l.isSignalled());
1161	<	t.interrupt();
1162	<	t.join();
1163	<	} catch (InterruptedException e){
1164	<	unexpectedException();
1165	<	}
1149	>
1150	>	Thread t = newStartedThread(new CheckedRunnable() {
1151	>	public void realRun() throws InterruptedException {
1152	>	assertFalse(l.isSignalled());
1153	>	long nanos = MILLISECONDS.toNanos(2 * LONG_DELAY_MS);
1154	>	assertTrue(l.tryAcquireSharedNanos(0, nanos));
1155	>	assertTrue(l.isSignalled());
1156	>	assertTrue(l.tryAcquireSharedNanos(0, nanos));
1157	>	assertTrue(l.isSignalled());
1158	>	}});
1159	>
1160	>	waitForQueuedThread(l, t);
1161	>	assertFalse(l.isSignalled());
1162	>	assertThreadStaysAlive(t);
1163	>	assertTrue(l.releaseShared(0));
1164	>	assertTrue(l.isSignalled());
1165	>	awaitTermination(t);
1166		}
1167
1168		/**
1169	<	* acquireSharedTimed throws IE if interrupted before released
1169	>	* acquireSharedInterruptibly is interruptible
1170		*/
1171	<	public void testAcquireSharedNanos_InterruptedException() {
1171	>	public void testAcquireSharedInterruptibly_Interruptible() {
1172		final BooleanLatch l = new BooleanLatch();
1173	<	Thread t = new Thread(new Runnable() {
1174	<	public void run() {
1175	<	try {
1176	<	threadAssertFalse(l.isSignalled());
1177	<	l.acquireSharedNanos(0, SMALL_DELAY_MS* 1000 * 1000);
1178	<	threadShouldThrow();
1179	<	} catch(InterruptedException success){}
1180	<	}
1181	<	});
1182	<	t.start();
1183	<	try {
646	<	Thread.sleep(SHORT_DELAY_MS);
647	<	assertFalse(l.isSignalled());
648	<	t.interrupt();
649	<	t.join();
650	<	} catch (InterruptedException e){
651	<	unexpectedException();
652	<	}
1173	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1174	>	public void realRun() throws InterruptedException {
1175	>	assertFalse(l.isSignalled());
1176	>	l.acquireSharedInterruptibly(0);
1177	>	}});
1178	>
1179	>	waitForQueuedThread(l, t);
1180	>	assertFalse(l.isSignalled());
1181	>	t.interrupt();
1182	>	awaitTermination(t);
1183	>	assertFalse(l.isSignalled());
1184		}
1185
1186		/**
1187	<	* acquireSharedTimed times out if not released before timeout
1187	>	* tryAcquireSharedNanos is interruptible
1188		*/
1189	<	public void testAcquireSharedNanos_Timeout() {
1189	>	public void testTryAcquireSharedNanos_Interruptible() {
1190		final BooleanLatch l = new BooleanLatch();
1191	<	Thread t = new Thread(new Runnable() {
1192	<	public void run() {
1193	<	try {
1194	<	threadAssertFalse(l.isSignalled());
1195	<	threadAssertFalse(l.acquireSharedNanos(0, SMALL_DELAY_MS* 1000 * 1000));
1196	<	} catch(InterruptedException ie){
1197	<	threadUnexpectedException();
1198	<	}
1191	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1192	>	public void realRun() throws InterruptedException {
1193	>	assertFalse(l.isSignalled());
1194	>	long nanos = MILLISECONDS.toNanos(2 * LONG_DELAY_MS);
1195	>	l.tryAcquireSharedNanos(0, nanos);
1196	>	}});
1197	>
1198	>	waitForQueuedThread(l, t);
1199	>	assertFalse(l.isSignalled());
1200	>	t.interrupt();
1201	>	awaitTermination(t);
1202	>	assertFalse(l.isSignalled());
1203	>	}
1204	>
1205	>	/**
1206	>	* tryAcquireSharedNanos times out if not released before timeout
1207	>	*/
1208	>	public void testTryAcquireSharedNanos_Timeout() {
1209	>	final BooleanLatch l = new BooleanLatch();
1210	>	final BooleanLatch observedQueued = new BooleanLatch();
1211	>	Thread t = newStartedThread(new CheckedRunnable() {
1212	>	public void realRun() throws InterruptedException {
1213	>	assertFalse(l.isSignalled());
1214	>	for (long millis = timeoutMillis();
1215	>	!observedQueued.isSignalled();
1216	>	millis *= 2) {
1217	>	long nanos = MILLISECONDS.toNanos(millis);
1218	>	long startTime = System.nanoTime();
1219	>	assertFalse(l.tryAcquireSharedNanos(0, nanos));
1220	>	assertTrue(millisElapsedSince(startTime) >= millis);
1221		}
1222	<	});
1223	<	t.start();
1224	<	try {
1225	<	Thread.sleep(SHORT_DELAY_MS);
1226	<	assertFalse(l.isSignalled());
1227	<	t.join();
1228	<	} catch (InterruptedException e){
1229	<	unexpectedException();
1230	<	}
1222	>	assertFalse(l.isSignalled());
1223	>	}});
1224	>
1225	>	waitForQueuedThread(l, t);
1226	>	observedQueued.releaseShared(0);
1227	>	assertFalse(l.isSignalled());
1228	>	awaitTermination(t);
1229	>	assertFalse(l.isSignalled());
1230	>	}
1231	>
1232	>	/**
1233	>	* awaitNanos/timed await with 0 wait times out immediately
1234	>	*/
1235	>	public void testAwait_Zero() throws InterruptedException {
1236	>	final Mutex sync = new Mutex();
1237	>	final ConditionObject c = sync.newCondition();
1238	>	sync.acquire();
1239	>	assertTrue(c.awaitNanos(0L) <= 0);
1240	>	assertFalse(c.await(0L, NANOSECONDS));
1241	>	sync.release();
1242		}
1243	<
1243	>
1244	>	/**
1245	>	* awaitNanos/timed await with maximum negative wait times does not underflow
1246	>	*/
1247	>	public void testAwait_NegativeInfinity() throws InterruptedException {
1248	>	final Mutex sync = new Mutex();
1249	>	final ConditionObject c = sync.newCondition();
1250	>	sync.acquire();
1251	>	assertTrue(c.awaitNanos(Long.MIN_VALUE) <= 0);
1252	>	assertFalse(c.await(Long.MIN_VALUE, NANOSECONDS));
1253	>	sync.release();
1254	>	}
1255	>
1256		}

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