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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 1.73 by jsr166, Fri Aug 16 02:32:26 2019 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.ArrayList;
13	>	import java.util.Arrays;
14	>	import java.util.Collection;
15	>	import java.util.HashSet;
16	>	import java.util.concurrent.atomic.AtomicBoolean;
17	>	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
18	>	import java.util.concurrent.locks.AbstractQueuedSynchronizer.ConditionObject;
19
20	+	import junit.framework.Test;
21	+	import junit.framework.TestSuite;
22	+
23	+	@SuppressWarnings("WaitNotInLoop") // we implement spurious-wakeup freedom
24		public class AbstractQueuedSynchronizerTest extends JSR166TestCase {
25		public static void main(String[] args) {
26	<	junit.textui.TestRunner.run (suite());
26	>	main(suite(), args);
27		}
28		public static Test suite() {
29		return new TestSuite(AbstractQueuedSynchronizerTest.class);
30		}
31
32		/**
33	<	* A simple mutex class, adapted from the
34	<	* AbstractQueuedSynchronizer javadoc.  Exclusive acquire tests
35	<	* exercise this as a sample user extension.  Other
36	<	* methods/features of AbstractQueuedSynchronizerTest are tested
37	<	* via other test classes, including those for ReentrantLock,
38	<	* ReentrantReadWriteLock, and Semaphore
33	>	* A simple mutex class, adapted from the class javadoc.  Exclusive
34	>	* acquire tests exercise this as a sample user extension.  Other
35	>	* methods/features of AbstractQueuedSynchronizer are tested via
36	>	* other test classes, including those for ReentrantLock,
37	>	* ReentrantReadWriteLock, and Semaphore.
38	>	*
39	>	* Unlike the javadoc sample, we don't track owner thread via
40	>	* AbstractOwnableSynchronizer methods.
41		*/
42		static class Mutex extends AbstractQueuedSynchronizer {
43	<	public boolean isLocked() { return getState() == 1; }
44	<
45	<	public boolean tryAcquireExclusive(int acquires) {
46	<	assertTrue(acquires == 1);
47	<	return compareAndSetState(0, 1);
48	<	}
49	<
50	<	public boolean tryReleaseExclusive(int releases) {
51	<	setState(0);
43	>	/** An eccentric value for locked synchronizer state. */
44	>	static final int LOCKED = (1 << 31) | (1 << 15);
45	>
46	>	static final int UNLOCKED = 0;
47	>
48	>	/** Owner thread is untracked, so this is really just isLocked(). */
49	>	@Override public boolean isHeldExclusively() {
50	>	int state = getState();
51	>	assertTrue(state == UNLOCKED || state == LOCKED);
52	>	return state == LOCKED;
53	>	}
54	>
55	>	@Override protected boolean tryAcquire(int acquires) {
56	>	assertEquals(LOCKED, acquires);
57	>	return compareAndSetState(UNLOCKED, LOCKED);
58	>	}
59	>
60	>	@Override protected boolean tryRelease(int releases) {
61	>	if (getState() != LOCKED) throw new IllegalMonitorStateException();
62	>	assertEquals(LOCKED, releases);
63	>	setState(UNLOCKED);
64		return true;
65		}
66	<
67	<	public void checkConditionAccess(Thread thread) {
68	<	if (getState() == 0) throw new IllegalMonitorStateException();
66	>
67	>	public boolean tryAcquireNanos(long nanos) throws InterruptedException {
68	>	return tryAcquireNanos(LOCKED, nanos);
69	>	}
70	>
71	>	public boolean tryAcquire() {
72	>	return tryAcquire(LOCKED);
73	>	}
74	>
75	>	public boolean tryRelease() {
76	>	return tryRelease(LOCKED);
77	>	}
78	>
79	>	public void acquire() {
80	>	acquire(LOCKED);
81	>	}
82	>
83	>	public void acquireInterruptibly() throws InterruptedException {
84	>	acquireInterruptibly(LOCKED);
85		}
86	<
87	<	public ConditionObject newCondition() { return new ConditionObject(); }
88	<
51	<	public void lock() {
52	<	acquireExclusiveUninterruptibly(1);
86	>
87	>	public void release() {
88	>	release(LOCKED);
89		}
90
91	+	/** Faux-Implements Lock.newCondition(). */
92	+	public ConditionObject newCondition() {
93	+	return new ConditionObject();
94	+	}
95		}
96
57	–
97		/**
98	<	* A simple latch class, to test shared mode.
98	>	* A minimal latch class, to test shared mode.
99		*/
100	<	static class BooleanLatch extends AbstractQueuedSynchronizer {
100	>	static class BooleanLatch extends AbstractQueuedSynchronizer {
101		public boolean isSignalled() { return getState() != 0; }
102
103		public int tryAcquireShared(int ignore) {
104	<	return isSignalled()? 1 : -1;
104	>	return isSignalled() ? 1 : -1;
105		}
106	<
106	>
107		public boolean tryReleaseShared(int ignore) {
108		setState(1);
109		return true;
#	Line 72 | Line 111 | public class AbstractQueuedSynchronizerT
111		}
112
113		/**
114	<	* A runnable calling acquireExclusiveInterruptibly
114	>	* A runnable calling acquireInterruptibly that does not expect to
115	>	* be interrupted.
116		*/
117	<	class InterruptibleLockRunnable implements Runnable {
118	<	final Mutex lock;
119	<	InterruptibleLockRunnable(Mutex l) { lock = l; }
120	<	public void run() {
121	<	try {
122	<	lock.acquireExclusiveInterruptibly(1);
123	<	} catch(InterruptedException success){}
117	>	class InterruptibleSyncRunnable extends CheckedRunnable {
118	>	final Mutex sync;
119	>	InterruptibleSyncRunnable(Mutex sync) { this.sync = sync; }
120	>	public void realRun() throws InterruptedException {
121	>	sync.acquireInterruptibly();
122	>	}
123	>	}
124	>
125	>	/**
126	>	* A runnable calling acquireInterruptibly that expects to be
127	>	* interrupted.
128	>	*/
129	>	class InterruptedSyncRunnable extends CheckedInterruptedRunnable {
130	>	final Mutex sync;
131	>	InterruptedSyncRunnable(Mutex sync) { this.sync = sync; }
132	>	public void realRun() throws InterruptedException {
133	>	sync.acquireInterruptibly();
134		}
135		}
136
137	+	/** A constant to clarify calls to checking methods below. */
138	+	static final Thread[] NO_THREADS = new Thread[0];
139
140		/**
141	<	* A runnable calling acquireExclusiveInterruptibly that expects to be
90	<	* interrupted
141	>	* Spin-waits until sync.isQueued(t) becomes true.
142		*/
143	<	class InterruptedLockRunnable implements Runnable {
144	<	final Mutex lock;
145	<	InterruptedLockRunnable(Mutex l) { lock = l; }
146	<	public void run() {
147	<	try {
148	<	lock.acquireExclusiveInterruptibly(1);
98	<	threadShouldThrow();
99	<	} catch(InterruptedException success){}
143	>	void waitForQueuedThread(AbstractQueuedSynchronizer sync, Thread t) {
144	>	long startTime = System.nanoTime();
145	>	while (!sync.isQueued(t)) {
146	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
147	>	throw new AssertionError("timed out");
148	>	Thread.yield();
149		}
150	+	assertTrue(t.isAlive());
151		}
152	<
152	>
153		/**
154	<	* acquireExclusiveUninterruptiblying an releaseExclusiveed lock succeeds
154	>	* Checks that sync has exactly the given queued threads.
155		*/
156	<	public void testAcquireExclusiveUninterruptibly() {
157	<	Mutex rl = new Mutex();
158	<	rl.acquireExclusiveUninterruptibly(1);
159	<	assertTrue(rl.isLocked());
160	<	rl.releaseExclusive(1);
156	>	void assertHasQueuedThreads(AbstractQueuedSynchronizer sync,
157	>	Thread... expected) {
158	>	Collection<Thread> actual = sync.getQueuedThreads();
159	>	assertEquals(expected.length > 0, sync.hasQueuedThreads());
160	>	assertEquals(expected.length, sync.getQueueLength());
161	>	assertEquals(expected.length, actual.size());
162	>	assertEquals(expected.length == 0, actual.isEmpty());
163	>	assertEquals(new HashSet<Thread>(actual),
164	>	new HashSet<Thread>(Arrays.asList(expected)));
165		}
166
167		/**
168	<	* tryAcquireExclusive on an releaseExclusiveed lock succeeds
168	>	* Checks that sync has exactly the given (exclusive) queued threads.
169		*/
170	<	public void testTryAcquireExclusive() {
171	<	Mutex rl = new Mutex();
172	<	assertTrue(rl.tryAcquireExclusive(1));
173	<	assertTrue(rl.isLocked());
174	<	rl.releaseExclusive(1);
170	>	void assertHasExclusiveQueuedThreads(AbstractQueuedSynchronizer sync,
171	>	Thread... expected) {
172	>	assertHasQueuedThreads(sync, expected);
173	>	assertEquals(new HashSet<Thread>(sync.getExclusiveQueuedThreads()),
174	>	new HashSet<Thread>(sync.getQueuedThreads()));
175	>	assertEquals(0, sync.getSharedQueuedThreads().size());
176	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
177		}
178
179		/**
180	<	* hasQueuedThreads reports whether there are waiting threads
180	>	* Checks that sync has exactly the given (shared) queued threads.
181		*/
182	<	public void testhasQueuedThreads() {
183	<	final Mutex lock = new Mutex();
184	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
185	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
186	<	try {
187	<	assertFalse(lock.hasQueuedThreads());
188	<	lock.acquireExclusiveUninterruptibly(1);
189	<	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	<	}
182	>	void assertHasSharedQueuedThreads(AbstractQueuedSynchronizer sync,
183	>	Thread... expected) {
184	>	assertHasQueuedThreads(sync, expected);
185	>	assertEquals(new HashSet<Thread>(sync.getSharedQueuedThreads()),
186	>	new HashSet<Thread>(sync.getQueuedThreads()));
187	>	assertEquals(0, sync.getExclusiveQueuedThreads().size());
188	>	assertTrue(sync.getExclusiveQueuedThreads().isEmpty());
189	>	}
190
191	+	/**
192	+	* Checks that condition c has exactly the given waiter threads,
193	+	* after acquiring mutex.
194	+	*/
195	+	void assertHasWaitersUnlocked(Mutex sync, ConditionObject c,
196	+	Thread... threads) {
197	+	sync.acquire();
198	+	assertHasWaitersLocked(sync, c, threads);
199	+	sync.release();
200	+	}
201
202		/**
203	<	* hasContended reports false if no thread has ever blocked, else true
203	>	* Checks that condition c has exactly the given waiter threads.
204	>	*/
205	>	void assertHasWaitersLocked(Mutex sync, ConditionObject c,
206	>	Thread... threads) {
207	>	assertEquals(threads.length > 0, sync.hasWaiters(c));
208	>	assertEquals(threads.length, sync.getWaitQueueLength(c));
209	>	assertEquals(threads.length == 0, sync.getWaitingThreads(c).isEmpty());
210	>	assertEquals(threads.length, sync.getWaitingThreads(c).size());
211	>	assertEquals(new HashSet<Thread>(sync.getWaitingThreads(c)),
212	>	new HashSet<Thread>(Arrays.asList(threads)));
213	>	}
214	>
215	>	enum AwaitMethod { await, awaitTimed, awaitNanos, awaitUntil }
216	>
217	>	/**
218	>	* Awaits condition using the specified AwaitMethod.
219		*/
220	<	public void testHasContended() {
221	<	final Mutex lock = new Mutex();
222	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
223	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
224	<	try {
225	<	assertFalse(lock.hasContended());
226	<	lock.acquireExclusiveUninterruptibly(1);
227	<	t1.start();
228	<	Thread.sleep(SHORT_DELAY_MS);
229	<	assertTrue(lock.hasContended());
230	<	t2.start();
231	<	Thread.sleep(SHORT_DELAY_MS);
232	<	assertTrue(lock.hasContended());
233	<	t1.interrupt();
234	<	Thread.sleep(SHORT_DELAY_MS);
235	<	assertTrue(lock.hasContended());
236	<	lock.releaseExclusive(1);
237	<	Thread.sleep(SHORT_DELAY_MS);
238	<	assertTrue(lock.hasContended());
239	<	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();
220	>	void await(ConditionObject c, AwaitMethod awaitMethod)
221	>	throws InterruptedException {
222	>	long timeoutMillis = 2 * LONG_DELAY_MS;
223	>	switch (awaitMethod) {
224	>	case await:
225	>	c.await();
226	>	break;
227	>	case awaitTimed:
228	>	assertTrue(c.await(timeoutMillis, MILLISECONDS));
229	>	break;
230	>	case awaitNanos:
231	>	long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis);
232	>	long nanosRemaining = c.awaitNanos(timeoutNanos);
233	>	assertTrue(nanosRemaining > 0);
234	>	break;
235	>	case awaitUntil:
236	>	assertTrue(c.awaitUntil(delayedDate(timeoutMillis)));
237	>	break;
238	>	default:
239	>	throw new AssertionError();
240		}
241		}
242
243	+	/**
244	+	* Checks that awaiting the given condition times out (using the
245	+	* default timeout duration).
246	+	*/
247	+	void assertAwaitTimesOut(ConditionObject c, AwaitMethod awaitMethod) {
248	+	final long timeoutMillis = timeoutMillis();
249	+	final long startTime;
250	+	try {
251	+	switch (awaitMethod) {
252	+	case awaitTimed:
253	+	startTime = System.nanoTime();
254	+	assertFalse(c.await(timeoutMillis, MILLISECONDS));
255	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
256	+	break;
257	+	case awaitNanos:
258	+	startTime = System.nanoTime();
259	+	long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis);
260	+	long nanosRemaining = c.awaitNanos(timeoutNanos);
261	+	assertTrue(nanosRemaining <= 0);
262	+	assertTrue(nanosRemaining > -MILLISECONDS.toNanos(LONG_DELAY_MS));
263	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
264	+	break;
265	+	case awaitUntil:
266	+	// We shouldn't assume that nanoTime and currentTimeMillis
267	+	// use the same time source, so don't use nanoTime here.
268	+	java.util.Date delayedDate = delayedDate(timeoutMillis);
269	+	assertFalse(c.awaitUntil(delayedDate(timeoutMillis)));
270	+	assertTrue(new java.util.Date().getTime() >= delayedDate.getTime());
271	+	break;
272	+	default:
273	+	throw new UnsupportedOperationException();
274	+	}
275	+	} catch (InterruptedException ie) { threadUnexpectedException(ie); }
276	+	}
277	+
278	+	/**
279	+	* isHeldExclusively is false upon construction
280	+	*/
281	+	public void testIsHeldExclusively() {
282	+	Mutex sync = new Mutex();
283	+	assertFalse(sync.isHeldExclusively());
284	+	}
285
286		/**
287	<	* TryAcquireExclusive on a locked lock fails
288	<	*/
289	<	public void testTryAcquireExclusiveWhenLocked() {
290	<	final Mutex lock = new Mutex();
291	<	lock.acquireExclusiveUninterruptibly(1);
292	<	Thread t = new Thread(new Runnable() {
293	<	public void run() {
294	<	threadAssertFalse(lock.tryAcquireExclusive(1));
295	<	}
296	<	});
297	<	try {
298	<	t.start();
299	<	t.join();
300	<	lock.releaseExclusive(1);
301	<	} catch(Exception e){
302	<	unexpectedException();
303	<	}
304	<	}
305	<
306	<	/**
307	<	* acquireExclusiveNanos on a locked lock times out
308	<	*/
309	<	public void testAcquireExclusiveNanos_Timeout() {
310	<	final Mutex lock = new Mutex();
311	<	lock.acquireExclusiveUninterruptibly(1);
312	<	Thread t = new Thread(new Runnable() {
313	<	public void run() {
314	<	try {
315	<	threadAssertFalse(lock.acquireExclusiveNanos(1, 1000 * 1000));
316	<	} catch (Exception ex) {
317	<	threadUnexpectedException();
318	<	}
319	<	}
320	<	});
321	<	try {
322	<	t.start();
323	<	t.join();
324	<	lock.releaseExclusive(1);
325	<	} catch(Exception e){
326	<	unexpectedException();
327	<	}
328	<	}
329	<
330	<
287	>	* acquiring released sync succeeds
288	>	*/
289	>	public void testAcquire() {
290	>	Mutex sync = new Mutex();
291	>	sync.acquire();
292	>	assertTrue(sync.isHeldExclusively());
293	>	sync.release();
294	>	assertFalse(sync.isHeldExclusively());
295	>	}
296	>
297	>	/**
298	>	* tryAcquire on a released sync succeeds
299	>	*/
300	>	public void testTryAcquire() {
301	>	Mutex sync = new Mutex();
302	>	assertTrue(sync.tryAcquire());
303	>	assertTrue(sync.isHeldExclusively());
304	>	sync.release();
305	>	assertFalse(sync.isHeldExclusively());
306	>	}
307	>
308	>	/**
309	>	* hasQueuedThreads reports whether there are waiting threads
310	>	*/
311	>	public void testHasQueuedThreads() {
312	>	final Mutex sync = new Mutex();
313	>	assertFalse(sync.hasQueuedThreads());
314	>	sync.acquire();
315	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
316	>	waitForQueuedThread(sync, t1);
317	>	assertTrue(sync.hasQueuedThreads());
318	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
319	>	waitForQueuedThread(sync, t2);
320	>	assertTrue(sync.hasQueuedThreads());
321	>	t1.interrupt();
322	>	awaitTermination(t1);
323	>	assertTrue(sync.hasQueuedThreads());
324	>	sync.release();
325	>	awaitTermination(t2);
326	>	assertFalse(sync.hasQueuedThreads());
327	>	}
328	>
329	>	/**
330	>	* isQueued(null) throws NullPointerException
331	>	*/
332	>	public void testIsQueuedNPE() {
333	>	final Mutex sync = new Mutex();
334	>	try {
335	>	sync.isQueued(null);
336	>	shouldThrow();
337	>	} catch (NullPointerException success) {}
338	>	}
339	>
340	>	/**
341	>	* isQueued reports whether a thread is queued
342	>	*/
343	>	public void testIsQueued() {
344	>	final Mutex sync = new Mutex();
345	>	Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
346	>	Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
347	>	assertFalse(sync.isQueued(t1));
348	>	assertFalse(sync.isQueued(t2));
349	>	sync.acquire();
350	>	t1.start();
351	>	waitForQueuedThread(sync, t1);
352	>	assertTrue(sync.isQueued(t1));
353	>	assertFalse(sync.isQueued(t2));
354	>	t2.start();
355	>	waitForQueuedThread(sync, t2);
356	>	assertTrue(sync.isQueued(t1));
357	>	assertTrue(sync.isQueued(t2));
358	>	t1.interrupt();
359	>	awaitTermination(t1);
360	>	assertFalse(sync.isQueued(t1));
361	>	assertTrue(sync.isQueued(t2));
362	>	sync.release();
363	>	awaitTermination(t2);
364	>	assertFalse(sync.isQueued(t1));
365	>	assertFalse(sync.isQueued(t2));
366	>	}
367	>
368	>	/**
369	>	* getFirstQueuedThread returns first waiting thread or null if none
370	>	*/
371	>	public void testGetFirstQueuedThread() {
372	>	final Mutex sync = new Mutex();
373	>	assertNull(sync.getFirstQueuedThread());
374	>	sync.acquire();
375	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
376	>	waitForQueuedThread(sync, t1);
377	>	assertEquals(t1, sync.getFirstQueuedThread());
378	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
379	>	waitForQueuedThread(sync, t2);
380	>	assertEquals(t1, sync.getFirstQueuedThread());
381	>	t1.interrupt();
382	>	awaitTermination(t1);
383	>	assertEquals(t2, sync.getFirstQueuedThread());
384	>	sync.release();
385	>	awaitTermination(t2);
386	>	assertNull(sync.getFirstQueuedThread());
387	>	}
388	>
389	>	/**
390	>	* hasContended reports false if no thread has ever blocked, else true
391	>	*/
392	>	public void testHasContended() {
393	>	final Mutex sync = new Mutex();
394	>	assertFalse(sync.hasContended());
395	>	sync.acquire();
396	>	assertFalse(sync.hasContended());
397	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
398	>	waitForQueuedThread(sync, t1);
399	>	assertTrue(sync.hasContended());
400	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
401	>	waitForQueuedThread(sync, t2);
402	>	assertTrue(sync.hasContended());
403	>	t1.interrupt();
404	>	awaitTermination(t1);
405	>	assertTrue(sync.hasContended());
406	>	sync.release();
407	>	awaitTermination(t2);
408	>	assertTrue(sync.hasContended());
409	>	}
410	>
411	>	/**
412	>	* getQueuedThreads returns all waiting threads
413	>	*/
414	>	public void testGetQueuedThreads() {
415	>	final Mutex sync = new Mutex();
416	>	Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
417	>	Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
418	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
419	>	sync.acquire();
420	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
421	>	t1.start();
422	>	waitForQueuedThread(sync, t1);
423	>	assertHasExclusiveQueuedThreads(sync, t1);
424	>	assertTrue(sync.getQueuedThreads().contains(t1));
425	>	assertFalse(sync.getQueuedThreads().contains(t2));
426	>	t2.start();
427	>	waitForQueuedThread(sync, t2);
428	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
429	>	assertTrue(sync.getQueuedThreads().contains(t1));
430	>	assertTrue(sync.getQueuedThreads().contains(t2));
431	>	t1.interrupt();
432	>	awaitTermination(t1);
433	>	assertHasExclusiveQueuedThreads(sync, t2);
434	>	sync.release();
435	>	awaitTermination(t2);
436	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
437	>	}
438	>
439	>	/**
440	>	* getExclusiveQueuedThreads returns all exclusive waiting threads
441	>	*/
442	>	public void testGetExclusiveQueuedThreads() {
443	>	final Mutex sync = new Mutex();
444	>	Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
445	>	Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
446	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
447	>	sync.acquire();
448	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
449	>	t1.start();
450	>	waitForQueuedThread(sync, t1);
451	>	assertHasExclusiveQueuedThreads(sync, t1);
452	>	assertTrue(sync.getExclusiveQueuedThreads().contains(t1));
453	>	assertFalse(sync.getExclusiveQueuedThreads().contains(t2));
454	>	t2.start();
455	>	waitForQueuedThread(sync, t2);
456	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
457	>	assertTrue(sync.getExclusiveQueuedThreads().contains(t1));
458	>	assertTrue(sync.getExclusiveQueuedThreads().contains(t2));
459	>	t1.interrupt();
460	>	awaitTermination(t1);
461	>	assertHasExclusiveQueuedThreads(sync, t2);
462	>	sync.release();
463	>	awaitTermination(t2);
464	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
465	>	}
466	>
467	>	/**
468	>	* getSharedQueuedThreads does not include exclusively waiting threads
469	>	*/
470	>	public void testGetSharedQueuedThreads_Exclusive() {
471	>	final Mutex sync = new Mutex();
472	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
473	>	sync.acquire();
474	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
475	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
476	>	waitForQueuedThread(sync, t1);
477	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
478	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
479	>	waitForQueuedThread(sync, t2);
480	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
481	>	t1.interrupt();
482	>	awaitTermination(t1);
483	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
484	>	sync.release();
485	>	awaitTermination(t2);
486	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
487	>	}
488	>
489	>	/**
490	>	* getSharedQueuedThreads returns all shared waiting threads
491	>	*/
492	>	public void testGetSharedQueuedThreads_Shared() {
493	>	final BooleanLatch l = new BooleanLatch();
494	>	assertHasSharedQueuedThreads(l, NO_THREADS);
495	>	Thread t1 = newStartedThread(new CheckedInterruptedRunnable() {
496	>	public void realRun() throws InterruptedException {
497	>	l.acquireSharedInterruptibly(0);
498	>	}});
499	>	waitForQueuedThread(l, t1);
500	>	assertHasSharedQueuedThreads(l, t1);
501	>	Thread t2 = newStartedThread(new CheckedRunnable() {
502	>	public void realRun() throws InterruptedException {
503	>	l.acquireSharedInterruptibly(0);
504	>	}});
505	>	waitForQueuedThread(l, t2);
506	>	assertHasSharedQueuedThreads(l, t1, t2);
507	>	t1.interrupt();
508	>	awaitTermination(t1);
509	>	assertHasSharedQueuedThreads(l, t2);
510	>	assertTrue(l.releaseShared(0));
511	>	awaitTermination(t2);
512	>	assertHasSharedQueuedThreads(l, NO_THREADS);
513	>	}
514	>
515	>	/**
516	>	* tryAcquireNanos is interruptible
517	>	*/
518	>	public void testTryAcquireNanos_Interruptible() {
519	>	final Mutex sync = new Mutex();
520	>	sync.acquire();
521	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
522	>	public void realRun() throws InterruptedException {
523	>	sync.tryAcquireNanos(MILLISECONDS.toNanos(2 * LONG_DELAY_MS));
524	>	}});
525	>
526	>	waitForQueuedThread(sync, t);
527	>	t.interrupt();
528	>	awaitTermination(t);
529	>	}
530	>
531	>	/**
532	>	* tryAcquire on exclusively held sync fails
533	>	*/
534	>	public void testTryAcquireWhenSynced() {
535	>	final Mutex sync = new Mutex();
536	>	sync.acquire();
537	>	Thread t = newStartedThread(new CheckedRunnable() {
538	>	public void realRun() {
539	>	assertFalse(sync.tryAcquire());
540	>	}});
541	>
542	>	awaitTermination(t);
543	>	sync.release();
544	>	}
545	>
546	>	/**
547	>	* tryAcquireNanos on an exclusively held sync times out
548	>	*/
549	>	public void testAcquireNanos_Timeout() {
550	>	final Mutex sync = new Mutex();
551	>	sync.acquire();
552	>	Thread t = newStartedThread(new CheckedRunnable() {
553	>	public void realRun() throws InterruptedException {
554	>	long startTime = System.nanoTime();
555	>	long nanos = MILLISECONDS.toNanos(timeoutMillis());
556	>	assertFalse(sync.tryAcquireNanos(nanos));
557	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
558	>	}});
559	>
560	>	awaitTermination(t);
561	>	sync.release();
562	>	}
563	>
564		/**
565		* getState is true when acquired and false when not
566		*/
567		public void testGetState() {
568	<	final Mutex lock = new Mutex();
569	<	lock.acquireExclusiveUninterruptibly(1);
570	<	assertTrue(lock.isLocked());
571	<	lock.releaseExclusive(1);
572	<	assertFalse(lock.isLocked());
573	<	Thread t = new Thread(new Runnable() {
574	<	public void run() {
575	<	lock.acquireExclusiveUninterruptibly(1);
576	<	try {
577	<	Thread.sleep(SMALL_DELAY_MS);
578	<	}
579	<	catch(Exception e) {
580	<	threadUnexpectedException();
581	<	}
582	<	lock.releaseExclusive(1);
583	<	}
584	<	});
585	<	try {
586	<	t.start();
587	<	Thread.sleep(SHORT_DELAY_MS);
588	<	assertTrue(lock.isLocked());
349	<	t.join();
350	<	assertFalse(lock.isLocked());
351	<	} catch(Exception e){
352	<	unexpectedException();
353	<	}
568	>	final Mutex sync = new Mutex();
569	>	sync.acquire();
570	>	assertTrue(sync.isHeldExclusively());
571	>	sync.release();
572	>	assertFalse(sync.isHeldExclusively());
573	>
574	>	final BooleanLatch acquired = new BooleanLatch();
575	>	final BooleanLatch done = new BooleanLatch();
576	>	Thread t = newStartedThread(new CheckedRunnable() {
577	>	public void realRun() throws InterruptedException {
578	>	sync.acquire();
579	>	assertTrue(acquired.releaseShared(0));
580	>	done.acquireShared(0);
581	>	sync.release();
582	>	}});
583	>
584	>	acquired.acquireShared(0);
585	>	assertTrue(sync.isHeldExclusively());
586	>	assertTrue(done.releaseShared(0));
587	>	awaitTermination(t);
588	>	assertFalse(sync.isHeldExclusively());
589		}
590
591	+	/**
592	+	* acquireInterruptibly succeeds when released, else is interruptible
593	+	*/
594	+	public void testAcquireInterruptibly() throws InterruptedException {
595	+	final Mutex sync = new Mutex();
596	+	final BooleanLatch threadStarted = new BooleanLatch();
597	+	sync.acquireInterruptibly();
598	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
599	+	public void realRun() throws InterruptedException {
600	+	assertTrue(threadStarted.releaseShared(0));
601	+	sync.acquireInterruptibly();
602	+	}});
603	+
604	+	threadStarted.acquireShared(0);
605	+	waitForQueuedThread(sync, t);
606	+	t.interrupt();
607	+	awaitTermination(t);
608	+	assertTrue(sync.isHeldExclusively());
609	+	}
610
611		/**
612	<	* acquireExclusiveInterruptibly is interruptible.
613	<	*/
614	<	public void testAcquireInterruptibly1() {
615	<	final Mutex lock = new Mutex();
616	<	lock.acquireExclusiveUninterruptibly(1);
617	<	Thread t = new Thread(new InterruptedLockRunnable(lock));
618	<	try {
619	<	t.start();
620	<	t.interrupt();
621	<	lock.releaseExclusive(1);
622	<	t.join();
623	<	} catch(Exception e){
624	<	unexpectedException();
625	<	}
626	<	}
627	<
628	<	/**
629	<	* acquireExclusiveInterruptibly succeeds when released, else is interruptible
630	<	*/
631	<	public void testAcquireInterruptibly2() {
632	<	final Mutex lock = new Mutex();
633	<	try {
634	<	lock.acquireExclusiveInterruptibly(1);
635	<	} 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();
612	>	* owns is true for a condition created by sync else false
613	>	*/
614	>	public void testOwns() {
615	>	final Mutex sync = new Mutex();
616	>	final ConditionObject c = sync.newCondition();
617	>	final Mutex sync2 = new Mutex();
618	>	assertTrue(sync.owns(c));
619	>	assertFalse(sync2.owns(c));
620	>	}
621	>
622	>	/**
623	>	* Calling await without holding sync throws IllegalMonitorStateException
624	>	*/
625	>	public void testAwait_IMSE() {
626	>	final Mutex sync = new Mutex();
627	>	final ConditionObject c = sync.newCondition();
628	>	for (AwaitMethod awaitMethod : AwaitMethod.values()) {
629	>	long startTime = System.nanoTime();
630	>	try {
631	>	await(c, awaitMethod);
632	>	shouldThrow();
633	>	} catch (IllegalMonitorStateException success) {
634	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
635	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
636		}
637		}
638
639		/**
640	<	* owns is true for a condition created by lock else false
640	>	* Calling signal without holding sync throws IllegalMonitorStateException
641		*/
642	<	public void testOwns() {
643	<	final Mutex lock = new Mutex();
644	<	final AbstractQueuedSynchronizer.ConditionObject c = lock.newCondition();
645	<	final Mutex lock2 = new Mutex();
646	<	assertTrue(lock.owns(c));
647	<	assertFalse(lock2.owns(c));
642	>	public void testSignal_IMSE() {
643	>	final Mutex sync = new Mutex();
644	>	final ConditionObject c = sync.newCondition();
645	>	try {
646	>	c.signal();
647	>	shouldThrow();
648	>	} catch (IllegalMonitorStateException success) {}
649	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
650		}
651
652		/**
653	<	* Calling await without holding lock throws IllegalMonitorStateException
653	>	* Calling signalAll without holding sync throws IllegalMonitorStateException
654		*/
655	<	public void testAwait_IllegalMonitor() {
656	<	final Mutex lock = new Mutex();
657	<	final Condition c = lock.newCondition();
655	>	public void testSignalAll_IMSE() {
656	>	final Mutex sync = new Mutex();
657	>	final ConditionObject c = sync.newCondition();
658		try {
659	<	c.await();
659	>	c.signalAll();
660		shouldThrow();
661	<	}
662	<	catch (IllegalMonitorStateException success) {
663	<	}
664	<	catch (Exception ex) {
665	<	unexpectedException();
666	<	}
661	>	} catch (IllegalMonitorStateException success) {}
662	>	}
663	>
664	>	/**
665	>	* await/awaitNanos/awaitUntil without a signal times out
666	>	*/
667	>	public void testAwaitTimed_Timeout() { testAwait_Timeout(AwaitMethod.awaitTimed); }
668	>	public void testAwaitNanos_Timeout() { testAwait_Timeout(AwaitMethod.awaitNanos); }
669	>	public void testAwaitUntil_Timeout() { testAwait_Timeout(AwaitMethod.awaitUntil); }
670	>	public void testAwait_Timeout(AwaitMethod awaitMethod) {
671	>	final Mutex sync = new Mutex();
672	>	final ConditionObject c = sync.newCondition();
673	>	sync.acquire();
674	>	assertAwaitTimesOut(c, awaitMethod);
675	>	sync.release();
676	>	}
677	>
678	>	/**
679	>	* await/awaitNanos/awaitUntil returns when signalled
680	>	*/
681	>	public void testSignal_await()      { testSignal(AwaitMethod.await); }
682	>	public void testSignal_awaitTimed() { testSignal(AwaitMethod.awaitTimed); }
683	>	public void testSignal_awaitNanos() { testSignal(AwaitMethod.awaitNanos); }
684	>	public void testSignal_awaitUntil() { testSignal(AwaitMethod.awaitUntil); }
685	>	public void testSignal(final AwaitMethod awaitMethod) {
686	>	final Mutex sync = new Mutex();
687	>	final ConditionObject c = sync.newCondition();
688	>	final BooleanLatch acquired = new BooleanLatch();
689	>	Thread t = newStartedThread(new CheckedRunnable() {
690	>	public void realRun() throws InterruptedException {
691	>	sync.acquire();
692	>	assertTrue(acquired.releaseShared(0));
693	>	await(c, awaitMethod);
694	>	sync.release();
695	>	}});
696	>
697	>	acquired.acquireShared(0);
698	>	sync.acquire();
699	>	assertHasWaitersLocked(sync, c, t);
700	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
701	>	c.signal();
702	>	assertHasWaitersLocked(sync, c, NO_THREADS);
703	>	assertHasExclusiveQueuedThreads(sync, t);
704	>	sync.release();
705	>	awaitTermination(t);
706		}
707
708		/**
709	<	* Calling signal without holding lock throws IllegalMonitorStateException
709	>	* hasWaiters(null) throws NullPointerException
710		*/
711	<	public void testSignal_IllegalMonitor() {
712	<	final Mutex lock = new Mutex();
428	<	final Condition c = lock.newCondition();
711	>	public void testHasWaitersNPE() {
712	>	final Mutex sync = new Mutex();
713		try {
714	<	c.signal();
714	>	sync.hasWaiters(null);
715		shouldThrow();
716	<	}
433	<	catch (IllegalMonitorStateException success) {
434	<	}
435	<	catch (Exception ex) {
436	<	unexpectedException();
437	<	}
716	>	} catch (NullPointerException success) {}
717		}
718
719		/**
720	<	* awaitNanos without a signal times out
720	>	* getWaitQueueLength(null) throws NullPointerException
721		*/
722	<	public void testAwaitNanos_Timeout() {
723	<	final Mutex lock = new Mutex();
445	<	final Condition c = lock.newCondition();
722	>	public void testGetWaitQueueLengthNPE() {
723	>	final Mutex sync = new Mutex();
724		try {
725	<	lock.acquireExclusiveUninterruptibly(1);
726	<	long t = c.awaitNanos(100);
727	<	assertTrue(t <= 0);
450	<	lock.releaseExclusive(1);
451	<	}
452	<	catch (Exception ex) {
453	<	unexpectedException();
454	<	}
725	>	sync.getWaitQueueLength(null);
726	>	shouldThrow();
727	>	} catch (NullPointerException success) {}
728		}
729
730		/**
731	<	*  timed await without a signal times out
731	>	* getWaitingThreads(null) throws NullPointerException
732		*/
733	<	public void testAwait_Timeout() {
734	<	final Mutex lock = new Mutex();
462	<	final Condition c = lock.newCondition();
733	>	public void testGetWaitingThreadsNPE() {
734	>	final Mutex sync = new Mutex();
735		try {
736	<	lock.acquireExclusiveUninterruptibly(1);
737	<	assertFalse(c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
738	<	lock.releaseExclusive(1);
467	<	}
468	<	catch (Exception ex) {
469	<	unexpectedException();
470	<	}
736	>	sync.getWaitingThreads(null);
737	>	shouldThrow();
738	>	} catch (NullPointerException success) {}
739		}
740
741		/**
742	<	* awaitUntil without a signal times out
742	>	* hasWaiters throws IllegalArgumentException if not owned
743		*/
744	<	public void testAwaitUntil_Timeout() {
745	<	final Mutex lock = new Mutex();
746	<	final Condition c = lock.newCondition();
744	>	public void testHasWaitersIAE() {
745	>	final Mutex sync = new Mutex();
746	>	final ConditionObject c = sync.newCondition();
747	>	final Mutex sync2 = new Mutex();
748		try {
749	<	lock.acquireExclusiveUninterruptibly(1);
750	<	java.util.Date d = new java.util.Date();
751	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
752	<	lock.releaseExclusive(1);
753	<	}
754	<	catch (Exception ex) {
755	<	unexpectedException();
756	<	}
749	>	sync2.hasWaiters(c);
750	>	shouldThrow();
751	>	} catch (IllegalArgumentException success) {}
752	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
753	>	}
754	>
755	>	/**
756	>	* hasWaiters throws IllegalMonitorStateException if not synced
757	>	*/
758	>	public void testHasWaitersIMSE() {
759	>	final Mutex sync = new Mutex();
760	>	final ConditionObject c = sync.newCondition();
761	>	try {
762	>	sync.hasWaiters(c);
763	>	shouldThrow();
764	>	} catch (IllegalMonitorStateException success) {}
765	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
766		}
767
768		/**
769	<	* await returns when signalled
769	>	* getWaitQueueLength throws IllegalArgumentException if not owned
770		*/
771	<	public void testAwait() {
772	<	final Mutex lock = new Mutex();
773	<	final Condition c = lock.newCondition();
774	<	Thread t = new Thread(new Runnable() {
775	<	public void run() {
776	<	try {
777	<	lock.acquireExclusiveUninterruptibly(1);
778	<	c.await();
779	<	lock.releaseExclusive(1);
780	<	}
503	<	catch(InterruptedException e) {
504	<	threadUnexpectedException();
505	<	}
506	<	}
507	<	});
771	>	public void testGetWaitQueueLengthIAE() {
772	>	final Mutex sync = new Mutex();
773	>	final ConditionObject c = sync.newCondition();
774	>	final Mutex sync2 = new Mutex();
775	>	try {
776	>	sync2.getWaitQueueLength(c);
777	>	shouldThrow();
778	>	} catch (IllegalArgumentException success) {}
779	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
780	>	}
781
782	+	/**
783	+	* getWaitQueueLength throws IllegalMonitorStateException if not synced
784	+	*/
785	+	public void testGetWaitQueueLengthIMSE() {
786	+	final Mutex sync = new Mutex();
787	+	final ConditionObject c = sync.newCondition();
788		try {
789	<	t.start();
790	<	Thread.sleep(SHORT_DELAY_MS);
791	<	lock.acquireExclusiveUninterruptibly(1);
792	<	c.signal();
514	<	lock.releaseExclusive(1);
515	<	t.join(SHORT_DELAY_MS);
516	<	assertFalse(t.isAlive());
517	<	}
518	<	catch (Exception ex) {
519	<	unexpectedException();
520	<	}
789	>	sync.getWaitQueueLength(c);
790	>	shouldThrow();
791	>	} catch (IllegalMonitorStateException success) {}
792	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
793		}
794
795	+	/**
796	+	* getWaitingThreads throws IllegalArgumentException if not owned
797	+	*/
798	+	public void testGetWaitingThreadsIAE() {
799	+	final Mutex sync = new Mutex();
800	+	final ConditionObject c = sync.newCondition();
801	+	final Mutex sync2 = new Mutex();
802	+	try {
803	+	sync2.getWaitingThreads(c);
804	+	shouldThrow();
805	+	} catch (IllegalArgumentException success) {}
806	+	assertHasWaitersUnlocked(sync, c, NO_THREADS);
807	+	}
808
809		/**
810	<	* Latch isSignalled initially returns false, then true after release
810	>	* getWaitingThreads throws IllegalMonitorStateException if not synced
811		*/
812	<	public void testLatchIsSignalled() {
813	<	final BooleanLatch l = new BooleanLatch();
814	<	assertFalse(l.isSignalled());
815	<	l.releaseShared(0);
816	<	assertTrue(l.isSignalled());
812	>	public void testGetWaitingThreadsIMSE() {
813	>	final Mutex sync = new Mutex();
814	>	final ConditionObject c = sync.newCondition();
815	>	try {
816	>	sync.getWaitingThreads(c);
817	>	shouldThrow();
818	>	} catch (IllegalMonitorStateException success) {}
819	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
820		}
821
822		/**
823	<	* release and has no effect when already signalled
823	>	* hasWaiters returns true when a thread is waiting, else false
824	>	*/
825	>	public void testHasWaiters() {
826	>	final Mutex sync = new Mutex();
827	>	final ConditionObject c = sync.newCondition();
828	>	final BooleanLatch acquired = new BooleanLatch();
829	>	Thread t = newStartedThread(new CheckedRunnable() {
830	>	public void realRun() throws InterruptedException {
831	>	sync.acquire();
832	>	assertHasWaitersLocked(sync, c, NO_THREADS);
833	>	assertFalse(sync.hasWaiters(c));
834	>	assertTrue(acquired.releaseShared(0));
835	>	c.await();
836	>	sync.release();
837	>	}});
838	>
839	>	acquired.acquireShared(0);
840	>	sync.acquire();
841	>	assertHasWaitersLocked(sync, c, t);
842	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
843	>	assertTrue(sync.hasWaiters(c));
844	>	c.signal();
845	>	assertHasWaitersLocked(sync, c, NO_THREADS);
846	>	assertHasExclusiveQueuedThreads(sync, t);
847	>	assertFalse(sync.hasWaiters(c));
848	>	sync.release();
849	>
850	>	awaitTermination(t);
851	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
852	>	}
853	>
854	>	/**
855	>	* getWaitQueueLength returns number of waiting threads
856	>	*/
857	>	public void testGetWaitQueueLength() {
858	>	final Mutex sync = new Mutex();
859	>	final ConditionObject c = sync.newCondition();
860	>	final BooleanLatch acquired1 = new BooleanLatch();
861	>	final BooleanLatch acquired2 = new BooleanLatch();
862	>	final Thread t1 = newStartedThread(new CheckedRunnable() {
863	>	public void realRun() throws InterruptedException {
864	>	sync.acquire();
865	>	assertHasWaitersLocked(sync, c, NO_THREADS);
866	>	assertEquals(0, sync.getWaitQueueLength(c));
867	>	assertTrue(acquired1.releaseShared(0));
868	>	c.await();
869	>	sync.release();
870	>	}});
871	>	acquired1.acquireShared(0);
872	>	sync.acquire();
873	>	assertHasWaitersLocked(sync, c, t1);
874	>	assertEquals(1, sync.getWaitQueueLength(c));
875	>	sync.release();
876	>
877	>	final Thread t2 = newStartedThread(new CheckedRunnable() {
878	>	public void realRun() throws InterruptedException {
879	>	sync.acquire();
880	>	assertHasWaitersLocked(sync, c, t1);
881	>	assertEquals(1, sync.getWaitQueueLength(c));
882	>	assertTrue(acquired2.releaseShared(0));
883	>	c.await();
884	>	sync.release();
885	>	}});
886	>	acquired2.acquireShared(0);
887	>	sync.acquire();
888	>	assertHasWaitersLocked(sync, c, t1, t2);
889	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
890	>	assertEquals(2, sync.getWaitQueueLength(c));
891	>	c.signalAll();
892	>	assertHasWaitersLocked(sync, c, NO_THREADS);
893	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
894	>	assertEquals(0, sync.getWaitQueueLength(c));
895	>	sync.release();
896	>
897	>	awaitTermination(t1);
898	>	awaitTermination(t2);
899	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
900	>	}
901	>
902	>	/**
903	>	* getWaitingThreads returns only and all waiting threads
904	>	*/
905	>	public void testGetWaitingThreads() {
906	>	final Mutex sync = new Mutex();
907	>	final ConditionObject c = sync.newCondition();
908	>	final BooleanLatch acquired1 = new BooleanLatch();
909	>	final BooleanLatch acquired2 = new BooleanLatch();
910	>	final Thread t1 = new Thread(new CheckedRunnable() {
911	>	public void realRun() throws InterruptedException {
912	>	sync.acquire();
913	>	assertHasWaitersLocked(sync, c, NO_THREADS);
914	>	assertTrue(sync.getWaitingThreads(c).isEmpty());
915	>	assertTrue(acquired1.releaseShared(0));
916	>	c.await();
917	>	sync.release();
918	>	}});
919	>
920	>	final Thread t2 = new Thread(new CheckedRunnable() {
921	>	public void realRun() throws InterruptedException {
922	>	sync.acquire();
923	>	assertHasWaitersLocked(sync, c, t1);
924	>	assertTrue(sync.getWaitingThreads(c).contains(t1));
925	>	assertFalse(sync.getWaitingThreads(c).isEmpty());
926	>	assertEquals(1, sync.getWaitingThreads(c).size());
927	>	assertTrue(acquired2.releaseShared(0));
928	>	c.await();
929	>	sync.release();
930	>	}});
931	>
932	>	sync.acquire();
933	>	assertHasWaitersLocked(sync, c, NO_THREADS);
934	>	assertFalse(sync.getWaitingThreads(c).contains(t1));
935	>	assertFalse(sync.getWaitingThreads(c).contains(t2));
936	>	assertTrue(sync.getWaitingThreads(c).isEmpty());
937	>	assertEquals(0, sync.getWaitingThreads(c).size());
938	>	sync.release();
939	>
940	>	t1.start();
941	>	acquired1.acquireShared(0);
942	>	sync.acquire();
943	>	assertHasWaitersLocked(sync, c, t1);
944	>	assertTrue(sync.getWaitingThreads(c).contains(t1));
945	>	assertFalse(sync.getWaitingThreads(c).contains(t2));
946	>	assertFalse(sync.getWaitingThreads(c).isEmpty());
947	>	assertEquals(1, sync.getWaitingThreads(c).size());
948	>	sync.release();
949	>
950	>	t2.start();
951	>	acquired2.acquireShared(0);
952	>	sync.acquire();
953	>	assertHasWaitersLocked(sync, c, t1, t2);
954	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
955	>	assertTrue(sync.getWaitingThreads(c).contains(t1));
956	>	assertTrue(sync.getWaitingThreads(c).contains(t2));
957	>	assertFalse(sync.getWaitingThreads(c).isEmpty());
958	>	assertEquals(2, sync.getWaitingThreads(c).size());
959	>	c.signalAll();
960	>	assertHasWaitersLocked(sync, c, NO_THREADS);
961	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
962	>	assertFalse(sync.getWaitingThreads(c).contains(t1));
963	>	assertFalse(sync.getWaitingThreads(c).contains(t2));
964	>	assertTrue(sync.getWaitingThreads(c).isEmpty());
965	>	assertEquals(0, sync.getWaitingThreads(c).size());
966	>	sync.release();
967	>
968	>	awaitTermination(t1);
969	>	awaitTermination(t2);
970	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
971	>	}
972	>
973	>	/**
974	>	* awaitUninterruptibly is uninterruptible
975	>	*/
976	>	public void testAwaitUninterruptibly() {
977	>	final Mutex sync = new Mutex();
978	>	final ConditionObject condition = sync.newCondition();
979	>	final BooleanLatch pleaseInterrupt = new BooleanLatch();
980	>	Thread t = newStartedThread(new CheckedRunnable() {
981	>	public void realRun() {
982	>	sync.acquire();
983	>	assertTrue(pleaseInterrupt.releaseShared(0));
984	>	condition.awaitUninterruptibly();
985	>	assertTrue(Thread.interrupted());
986	>	assertHasWaitersLocked(sync, condition, NO_THREADS);
987	>	sync.release();
988	>	}});
989	>
990	>	pleaseInterrupt.acquireShared(0);
991	>	sync.acquire();
992	>	assertHasWaitersLocked(sync, condition, t);
993	>	sync.release();
994	>	t.interrupt();
995	>	assertHasWaitersUnlocked(sync, condition, t);
996	>	assertThreadBlocks(t, Thread.State.WAITING);
997	>	sync.acquire();
998	>	assertHasWaitersLocked(sync, condition, t);
999	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
1000	>	condition.signal();
1001	>	assertHasWaitersLocked(sync, condition, NO_THREADS);
1002	>	assertHasExclusiveQueuedThreads(sync, t);
1003	>	sync.release();
1004	>	awaitTermination(t);
1005	>	}
1006	>
1007	>	/**
1008	>	* await/awaitNanos/awaitUntil is interruptible
1009	>	*/
1010	>	public void testInterruptible_await()      { testInterruptible(AwaitMethod.await); }
1011	>	public void testInterruptible_awaitTimed() { testInterruptible(AwaitMethod.awaitTimed); }
1012	>	public void testInterruptible_awaitNanos() { testInterruptible(AwaitMethod.awaitNanos); }
1013	>	public void testInterruptible_awaitUntil() { testInterruptible(AwaitMethod.awaitUntil); }
1014	>	public void testInterruptible(final AwaitMethod awaitMethod) {
1015	>	final Mutex sync = new Mutex();
1016	>	final ConditionObject c = sync.newCondition();
1017	>	final BooleanLatch pleaseInterrupt = new BooleanLatch();
1018	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1019	>	public void realRun() throws InterruptedException {
1020	>	sync.acquire();
1021	>	assertTrue(pleaseInterrupt.releaseShared(0));
1022	>	await(c, awaitMethod);
1023	>	}});
1024	>
1025	>	pleaseInterrupt.acquireShared(0);
1026	>	t.interrupt();
1027	>	awaitTermination(t);
1028	>	}
1029	>
1030	>	/**
1031	>	* signalAll wakes up all threads
1032	>	*/
1033	>	public void testSignalAll_await()      { testSignalAll(AwaitMethod.await); }
1034	>	public void testSignalAll_awaitTimed() { testSignalAll(AwaitMethod.awaitTimed); }
1035	>	public void testSignalAll_awaitNanos() { testSignalAll(AwaitMethod.awaitNanos); }
1036	>	public void testSignalAll_awaitUntil() { testSignalAll(AwaitMethod.awaitUntil); }
1037	>	public void testSignalAll(final AwaitMethod awaitMethod) {
1038	>	final Mutex sync = new Mutex();
1039	>	final ConditionObject c = sync.newCondition();
1040	>	final BooleanLatch acquired1 = new BooleanLatch();
1041	>	final BooleanLatch acquired2 = new BooleanLatch();
1042	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1043	>	public void realRun() throws InterruptedException {
1044	>	sync.acquire();
1045	>	acquired1.releaseShared(0);
1046	>	await(c, awaitMethod);
1047	>	sync.release();
1048	>	}});
1049	>
1050	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1051	>	public void realRun() throws InterruptedException {
1052	>	sync.acquire();
1053	>	acquired2.releaseShared(0);
1054	>	await(c, awaitMethod);
1055	>	sync.release();
1056	>	}});
1057	>
1058	>	acquired1.acquireShared(0);
1059	>	acquired2.acquireShared(0);
1060	>	sync.acquire();
1061	>	assertHasWaitersLocked(sync, c, t1, t2);
1062	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
1063	>	c.signalAll();
1064	>	assertHasWaitersLocked(sync, c, NO_THREADS);
1065	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
1066	>	sync.release();
1067	>	awaitTermination(t1);
1068	>	awaitTermination(t2);
1069	>	}
1070	>
1071	>	/**
1072	>	* toString indicates current state
1073	>	*/
1074	>	public void testToString() {
1075	>	Mutex sync = new Mutex();
1076	>	assertTrue(sync.toString().contains("State = " + Mutex.UNLOCKED));
1077	>	sync.acquire();
1078	>	assertTrue(sync.toString().contains("State = " + Mutex.LOCKED));
1079	>	}
1080	>
1081	>	/**
1082	>	* A serialized AQS deserializes with current state, but no queued threads
1083	>	*/
1084	>	public void testSerialization() {
1085	>	Mutex sync = new Mutex();
1086	>	assertFalse(serialClone(sync).isHeldExclusively());
1087	>	sync.acquire();
1088	>	Thread t = newStartedThread(new InterruptedSyncRunnable(sync));
1089	>	waitForQueuedThread(sync, t);
1090	>	assertTrue(sync.isHeldExclusively());
1091	>
1092	>	Mutex clone = serialClone(sync);
1093	>	assertTrue(clone.isHeldExclusively());
1094	>	assertHasExclusiveQueuedThreads(sync, t);
1095	>	assertHasExclusiveQueuedThreads(clone, NO_THREADS);
1096	>	t.interrupt();
1097	>	awaitTermination(t);
1098	>	sync.release();
1099	>	assertFalse(sync.isHeldExclusively());
1100	>	assertTrue(clone.isHeldExclusively());
1101	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
1102	>	assertHasExclusiveQueuedThreads(clone, NO_THREADS);
1103	>	}
1104	>
1105	>	/**
1106	>	* tryReleaseShared setting state changes getState
1107	>	*/
1108	>	public void testGetStateWithReleaseShared() {
1109	>	final BooleanLatch l = new BooleanLatch();
1110	>	assertFalse(l.isSignalled());
1111	>	assertTrue(l.releaseShared(0));
1112	>	assertTrue(l.isSignalled());
1113	>	}
1114	>
1115	>	/**
1116	>	* releaseShared has no effect when already signalled
1117		*/
1118		public void testReleaseShared() {
1119	<	final BooleanLatch l = new BooleanLatch();
1120	<	assertFalse(l.isSignalled());
1121	<	l.releaseShared(0);
1122	<	assertTrue(l.isSignalled());
1123	<	l.releaseShared(0);
1124	<	assertTrue(l.isSignalled());
1119	>	final BooleanLatch l = new BooleanLatch();
1120	>	assertFalse(l.isSignalled());
1121	>	assertTrue(l.releaseShared(0));
1122	>	assertTrue(l.isSignalled());
1123	>	assertTrue(l.releaseShared(0));
1124	>	assertTrue(l.isSignalled());
1125		}
1126
1127		/**
1128		* acquireSharedInterruptibly returns after release, but not before
1129		*/
1130		public void testAcquireSharedInterruptibly() {
1131	<	final BooleanLatch l = new BooleanLatch();
1131	>	final BooleanLatch l = new BooleanLatch();
1132
1133	<	Thread t = new Thread(new Runnable() {
1134	<	public void run() {
1135	<	try {
1136	<	threadAssertFalse(l.isSignalled());
1137	<	l.acquireSharedInterruptibly(0);
1138	<	threadAssertTrue(l.isSignalled());
1139	<	} catch(InterruptedException e){
1140	<	threadUnexpectedException();
1141	<	}
1142	<	}
1143	<	});
1144	<	try {
1145	<	t.start();
1146	<	assertFalse(l.isSignalled());
1147	<	Thread.sleep(SHORT_DELAY_MS);
1148	<	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	<	}
1133	>	Thread t = newStartedThread(new CheckedRunnable() {
1134	>	public void realRun() throws InterruptedException {
1135	>	assertFalse(l.isSignalled());
1136	>	l.acquireSharedInterruptibly(0);
1137	>	assertTrue(l.isSignalled());
1138	>	l.acquireSharedInterruptibly(0);
1139	>	assertTrue(l.isSignalled());
1140	>	}});
1141	>
1142	>	waitForQueuedThread(l, t);
1143	>	assertFalse(l.isSignalled());
1144	>	assertThreadBlocks(t, Thread.State.WAITING);
1145	>	assertHasSharedQueuedThreads(l, t);
1146	>	assertTrue(l.releaseShared(0));
1147	>	assertTrue(l.isSignalled());
1148	>	awaitTermination(t);
1149		}
1150	<
1150	>
1151		/**
1152	<	* acquireSharedInterruptibly throws IE if interrupted before released
1152	>	* tryAcquireSharedNanos returns after release, but not before
1153		*/
1154	<	public void testAcquireSharedInterruptibly_InterruptedException() {
1154	>	public void testTryAcquireSharedNanos() {
1155		final BooleanLatch l = new BooleanLatch();
1156	<	Thread t = new Thread(new Runnable() {
1157	<	public void run() {
1158	<	try {
1159	<	threadAssertFalse(l.isSignalled());
1160	<	l.acquireSharedInterruptibly(0);
1161	<	threadShouldThrow();
1162	<	} catch(InterruptedException success){}
1163	<	}
1164	<	});
1165	<	t.start();
1166	<	try {
1167	<	assertFalse(l.isSignalled());
1168	<	t.interrupt();
1169	<	t.join();
1170	<	} catch (InterruptedException e){
1171	<	unexpectedException();
1172	<	}
1156	>
1157	>	Thread t = newStartedThread(new CheckedRunnable() {
1158	>	public void realRun() throws InterruptedException {
1159	>	assertFalse(l.isSignalled());
1160	>	long nanos = MILLISECONDS.toNanos(2 * LONG_DELAY_MS);
1161	>	assertTrue(l.tryAcquireSharedNanos(0, nanos));
1162	>	assertTrue(l.isSignalled());
1163	>	assertTrue(l.tryAcquireSharedNanos(0, nanos));
1164	>	assertTrue(l.isSignalled());
1165	>	}});
1166	>
1167	>	waitForQueuedThread(l, t);
1168	>	assertFalse(l.isSignalled());
1169	>	assertThreadBlocks(t, Thread.State.TIMED_WAITING);
1170	>	assertTrue(l.releaseShared(0));
1171	>	assertTrue(l.isSignalled());
1172	>	awaitTermination(t);
1173		}
1174
1175		/**
1176	<	* acquireSharedTimed throws IE if interrupted before released
1176	>	* acquireSharedInterruptibly is interruptible
1177		*/
1178	<	public void testAcquireSharedNanos_InterruptedException() {
1178	>	public void testAcquireSharedInterruptibly_Interruptible() {
1179		final BooleanLatch l = new BooleanLatch();
1180	<	Thread t = new Thread(new Runnable() {
1181	<	public void run() {
1182	<	try {
1183	<	threadAssertFalse(l.isSignalled());
1184	<	l.acquireSharedNanos(0, SMALL_DELAY_MS* 1000 * 1000);
1185	<	threadShouldThrow();
1186	<	} catch(InterruptedException success){}
1187	<	}
1188	<	});
1189	<	t.start();
1190	<	try {
1191	<	Thread.sleep(SHORT_DELAY_MS);
1192	<	assertFalse(l.isSignalled());
1193	<	t.interrupt();
1194	<	t.join();
1195	<	} catch (InterruptedException e){
1196	<	unexpectedException();
1197	<	}
1180	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1181	>	public void realRun() throws InterruptedException {
1182	>	assertFalse(l.isSignalled());
1183	>	l.acquireSharedInterruptibly(0);
1184	>	}});
1185	>
1186	>	waitForQueuedThread(l, t);
1187	>	assertFalse(l.isSignalled());
1188	>	t.interrupt();
1189	>	awaitTermination(t);
1190	>	assertFalse(l.isSignalled());
1191	>	}
1192	>
1193	>	/**
1194	>	* tryAcquireSharedNanos is interruptible
1195	>	*/
1196	>	public void testTryAcquireSharedNanos_Interruptible() {
1197	>	final BooleanLatch l = new BooleanLatch();
1198	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1199	>	public void realRun() throws InterruptedException {
1200	>	assertFalse(l.isSignalled());
1201	>	long nanos = MILLISECONDS.toNanos(2 * LONG_DELAY_MS);
1202	>	l.tryAcquireSharedNanos(0, nanos);
1203	>	}});
1204	>
1205	>	waitForQueuedThread(l, t);
1206	>	assertFalse(l.isSignalled());
1207	>	t.interrupt();
1208	>	awaitTermination(t);
1209	>	assertFalse(l.isSignalled());
1210		}
1211
1212		/**
1213	<	* acquireSharedTimed times out if not released before timeout
1213	>	* tryAcquireSharedNanos times out if not released before timeout
1214		*/
1215	<	public void testAcquireSharedNanos_Timeout() {
1215	>	public void testTryAcquireSharedNanos_Timeout() {
1216		final BooleanLatch l = new BooleanLatch();
1217	<	Thread t = new Thread(new Runnable() {
1218	<	public void run() {
1219	<	try {
1220	<	threadAssertFalse(l.isSignalled());
1221	<	threadAssertFalse(l.acquireSharedNanos(0, SMALL_DELAY_MS* 1000 * 1000));
1222	<	} catch(InterruptedException ie){
1223	<	threadUnexpectedException();
1224	<	}
1217	>	final BooleanLatch observedQueued = new BooleanLatch();
1218	>	Thread t = newStartedThread(new CheckedRunnable() {
1219	>	public void realRun() throws InterruptedException {
1220	>	assertFalse(l.isSignalled());
1221	>	for (long millis = timeoutMillis();
1222	>	!observedQueued.isSignalled();
1223	>	millis *= 2) {
1224	>	long nanos = MILLISECONDS.toNanos(millis);
1225	>	long startTime = System.nanoTime();
1226	>	assertFalse(l.tryAcquireSharedNanos(0, nanos));
1227	>	assertTrue(millisElapsedSince(startTime) >= millis);
1228		}
1229	<	});
1230	<	t.start();
1231	<	try {
1232	<	Thread.sleep(SHORT_DELAY_MS);
1233	<	assertFalse(l.isSignalled());
1234	<	t.join();
1235	<	} catch (InterruptedException e){
1236	<	unexpectedException();
1229	>	assertFalse(l.isSignalled());
1230	>	}});
1231	>
1232	>	waitForQueuedThread(l, t);
1233	>	observedQueued.releaseShared(0);
1234	>	assertFalse(l.isSignalled());
1235	>	awaitTermination(t);
1236	>	assertFalse(l.isSignalled());
1237	>	}
1238	>
1239	>	/**
1240	>	* awaitNanos/timed await with 0 wait times out immediately
1241	>	*/
1242	>	public void testAwait_Zero() throws InterruptedException {
1243	>	final Mutex sync = new Mutex();
1244	>	final ConditionObject c = sync.newCondition();
1245	>	sync.acquire();
1246	>	assertTrue(c.awaitNanos(0L) <= 0);
1247	>	assertFalse(c.await(0L, NANOSECONDS));
1248	>	sync.release();
1249	>	}
1250	>
1251	>	/**
1252	>	* awaitNanos/timed await with maximum negative wait times does not underflow
1253	>	*/
1254	>	public void testAwait_NegativeInfinity() throws InterruptedException {
1255	>	final Mutex sync = new Mutex();
1256	>	final ConditionObject c = sync.newCondition();
1257	>	sync.acquire();
1258	>	assertTrue(c.awaitNanos(Long.MIN_VALUE) <= 0);
1259	>	assertFalse(c.await(Long.MIN_VALUE, NANOSECONDS));
1260	>	sync.release();
1261	>	}
1262	>
1263	>	/**
1264	>	* JDK-8191483: AbstractQueuedSynchronizer cancel/cancel race
1265	>	* ant -Djsr166.tckTestClass=AbstractQueuedSynchronizerTest -Djsr166.methodFilter=testCancelCancelRace -Djsr166.runsPerTest=100 tck
1266	>	*/
1267	>	public void testCancelCancelRace() throws InterruptedException {
1268	>	class Sync extends AbstractQueuedSynchronizer {
1269	>	protected boolean tryAcquire(int acquires) {
1270	>	return !hasQueuedPredecessors() && compareAndSetState(0, 1);
1271	>	}
1272	>	protected boolean tryRelease(int releases) {
1273	>	return compareAndSetState(1, 0);
1274	>	}
1275		}
1276	+
1277	+	Sync s = new Sync();
1278	+	s.acquire(1);           // acquire to force other threads to enqueue
1279	+
1280	+	// try to trigger double cancel race with two background threads
1281	+	ArrayList<Thread> threads = new ArrayList<>();
1282	+	Runnable failedAcquire = () -> {
1283	+	try {
1284	+	s.acquireInterruptibly(1);
1285	+	shouldThrow();
1286	+	} catch (InterruptedException success) {}
1287	+	};
1288	+	for (int i = 0; i < 2; i++) {
1289	+	Thread thread = new Thread(failedAcquire);
1290	+	thread.start();
1291	+	threads.add(thread);
1292	+	}
1293	+	Thread.sleep(100);
1294	+	for (Thread thread : threads) thread.interrupt();
1295	+	for (Thread thread : threads) awaitTermination(thread);
1296	+
1297	+	s.release(1);
1298	+
1299	+	// no one holds lock now, we should be able to acquire
1300	+	if (!s.tryAcquire(1))
1301	+	throw new RuntimeException(
1302	+	String.format(
1303	+	"Broken: hasQueuedPredecessors=%s hasQueuedThreads=%s queueLength=%d firstQueuedThread=%s",
1304	+	s.hasQueuedPredecessors(),
1305	+	s.hasQueuedThreads(),
1306	+	s.getQueueLength(),
1307	+	s.getFirstQueuedThread()));
1308		}
1309	<
1309	>
1310	>	/**
1311	>	* Tests scenario for
1312	>	* JDK-8191937: Lost interrupt in AbstractQueuedSynchronizer when tryAcquire methods throw
1313	>	* ant -Djsr166.tckTestClass=AbstractQueuedSynchronizerTest -Djsr166.methodFilter=testInterruptedFailingAcquire -Djsr166.runsPerTest=10000 tck
1314	>	*/
1315	>	public void testInterruptedFailingAcquire() throws Throwable {
1316	>	class PleaseThrow extends RuntimeException {}
1317	>	final PleaseThrow ex = new PleaseThrow();
1318	>	final AtomicBoolean thrown = new AtomicBoolean();
1319	>
1320	>	// A synchronizer only offering a choice of failure modes
1321	>	class Sync extends AbstractQueuedSynchronizer {
1322	>	volatile boolean pleaseThrow;
1323	>	void maybeThrow() {
1324	>	if (pleaseThrow) {
1325	>	// assert: tryAcquire methods can throw at most once
1326	>	if (! thrown.compareAndSet(false, true))
1327	>	throw new AssertionError();
1328	>	throw ex;
1329	>	}
1330	>	}
1331	>
1332	>	@Override protected boolean tryAcquire(int ignored) {
1333	>	maybeThrow();
1334	>	return false;
1335	>	}
1336	>	@Override protected int tryAcquireShared(int ignored) {
1337	>	maybeThrow();
1338	>	return -1;
1339	>	}
1340	>	@Override protected boolean tryRelease(int ignored) {
1341	>	return true;
1342	>	}
1343	>	@Override protected boolean tryReleaseShared(int ignored) {
1344	>	return true;
1345	>	}
1346	>	}
1347	>
1348	>	final Sync s = new Sync();
1349	>	final boolean acquireInterruptibly = randomBoolean();
1350	>	final Action[] uninterruptibleAcquireActions = {
1351	>	() -> s.acquire(1),
1352	>	() -> s.acquireShared(1),
1353	>	};
1354	>	final long nanosTimeout = MILLISECONDS.toNanos(2 * LONG_DELAY_MS);
1355	>	final Action[] interruptibleAcquireActions = {
1356	>	() -> s.acquireInterruptibly(1),
1357	>	() -> s.acquireSharedInterruptibly(1),
1358	>	() -> s.tryAcquireNanos(1, nanosTimeout),
1359	>	() -> s.tryAcquireSharedNanos(1, nanosTimeout),
1360	>	};
1361	>	final Action[] releaseActions = {
1362	>	() -> s.release(1),
1363	>	() -> s.releaseShared(1),
1364	>	};
1365	>	final Action acquireAction = acquireInterruptibly
1366	>	? chooseRandomly(interruptibleAcquireActions)
1367	>	: chooseRandomly(uninterruptibleAcquireActions);
1368	>	final Action releaseAction
1369	>	= chooseRandomly(releaseActions);
1370	>
1371	>	// From os_posix.cpp:
1372	>	//
1373	>	// NOTE that since there is no "lock" around the interrupt and
1374	>	// is_interrupted operations, there is the possibility that the
1375	>	// interrupted flag (in osThread) will be "false" but that the
1376	>	// low-level events will be in the signaled state. This is
1377	>	// intentional. The effect of this is that Object.wait() and
1378	>	// LockSupport.park() will appear to have a spurious wakeup, which
1379	>	// is allowed and not harmful, and the possibility is so rare that
1380	>	// it is not worth the added complexity to add yet another lock.
1381	>	final Thread thread = newStartedThread(new CheckedRunnable() {
1382	>	public void realRun() throws Throwable {
1383	>	try {
1384	>	acquireAction.run();
1385	>	shouldThrow();
1386	>	} catch (InterruptedException possible) {
1387	>	assertTrue(acquireInterruptibly);
1388	>	assertFalse(Thread.interrupted());
1389	>	} catch (PleaseThrow possible) {
1390	>	awaitInterrupted();
1391	>	}
1392	>	}});
1393	>	for (long startTime = 0L;; ) {
1394	>	waitForThreadToEnterWaitState(thread);
1395	>	if (s.getFirstQueuedThread() == thread
1396	>	&& s.hasQueuedPredecessors()
1397	>	&& s.hasQueuedThreads()
1398	>	&& s.getQueueLength() == 1
1399	>	&& s.hasContended())
1400	>	break;
1401	>	if (startTime == 0L)
1402	>	startTime = System.nanoTime();
1403	>	else if (millisElapsedSince(startTime) > LONG_DELAY_MS)
1404	>	fail("timed out waiting for AQS state: "
1405	>	+ "thread state=" + thread.getState()
1406	>	+ ", queued threads=" + s.getQueuedThreads());
1407	>	Thread.yield();
1408	>	}
1409	>
1410	>	s.pleaseThrow = true;
1411	>	// release and interrupt, in random order
1412	>	if (randomBoolean()) {
1413	>	thread.interrupt();
1414	>	releaseAction.run();
1415	>	} else {
1416	>	releaseAction.run();
1417	>	thread.interrupt();
1418	>	}
1419	>	awaitTermination(thread);
1420	>
1421	>	if (! acquireInterruptibly)
1422	>	assertTrue(thrown.get());
1423	>
1424	>	assertNull(s.getFirstQueuedThread());
1425	>	assertFalse(s.hasQueuedPredecessors());
1426	>	assertFalse(s.hasQueuedThreads());
1427	>	assertEquals(0, s.getQueueLength());
1428	>	assertTrue(s.getQueuedThreads().isEmpty());
1429	>	assertTrue(s.hasContended());
1430	>	}
1431	>
1432		}

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