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Comparing jsr166/src/test/tck/AbstractQueuedSynchronizerTest.java (file contents):
Revision 1.7 by dl, Fri Jan 2 21:06:38 2004 UTC vs.
Revision 1.66 by jsr166, Tue Aug 13 00:54:51 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.ThreadLocalRandom;
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, from the AbstractQueuedSynchronizer
34	<	* javadoc.  All tests exercise this as a sample user extension.
35	<	* Other methods/features of AbstractQueuedSynchronizerTest are
36	<	* tested implicitly in ReentrantLock, ReentrantReadWriteLock, and
37	<	* Semaphore test classes
38	<	*/
39	<	static class Mutex implements Lock, java.io.Serializable {
40	<	private static class Sync extends AbstractQueuedSynchronizer {
41	<	boolean isLocked() { return getState() == 1; }
42	<
43	<	public boolean tryAcquireExclusive(boolean isQueued, int acquires) {
44	<	assert acquires == 1; // Does not use multiple acquires
45	<	return compareAndSetState(0, 1);
46	<	}
47	<
48	<	public boolean tryReleaseExclusive(int releases) {
49	<	setState(0);
50	<	return true;
51	<	}
52	<
53	<	public void checkConditionAccess(Thread thread, boolean waiting) {
54	<	if (getState() == 0) throw new IllegalMonitorStateException();
55	<	}
56	<
57	<	Condition newCondition() { return new ConditionObject(); }
58	<
59	<	private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException {
60	<	s.defaultReadObject();
61	<	setState(0); // reset to unlocked state
62	<	}
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	>	/** 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 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	<	private final Sync sync = new Sync();
80	<	public boolean tryLock() {
59	<	return sync.tryAcquireExclusive(false, 1);
78	>
79	>	public void acquire() {
80	>	acquire(LOCKED);
81		}
82	<	public void lock() {
83	<	sync.acquireExclusiveUninterruptibly(1);
82	>
83	>	public void acquireInterruptibly() throws InterruptedException {
84	>	acquireInterruptibly(LOCKED);
85		}
86	<	public void lockInterruptibly() throws InterruptedException {
87	<	sync.acquireExclusiveInterruptibly(1);
86	>
87	>	public void release() {
88	>	release(LOCKED);
89		}
90	<	public boolean tryLock(long timeout, TimeUnit unit) throws InterruptedException {
91	<	return sync.acquireExclusiveTimed(1, unit.toNanos(timeout));
90	>
91	>	/** Faux-Implements Lock.newCondition(). */
92	>	public ConditionObject newCondition() {
93	>	return new ConditionObject();
94		}
70	–	public void unlock() { sync.releaseExclusive(1); }
71	–	public Condition newCondition() { return sync.newCondition(); }
72	–	public boolean isLocked() { return sync.isLocked(); }
73	–	public boolean hasQueuedThreads() { return sync.hasQueuedThreads(); }
95		}
96
97		/**
98	<	* A runnable calling lockInterruptibly
98	>	* A minimal latch class, to test shared mode.
99		*/
100	<	class InterruptibleLockRunnable implements Runnable {
101	<	final Mutex lock;
102	<	InterruptibleLockRunnable(Mutex l) { lock = l; }
103	<	public void run() {
104	<	try {
105	<	lock.lockInterruptibly();
106	<	} catch(InterruptedException success){}
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;
105	>	}
106	>
107	>	public boolean tryReleaseShared(int ignore) {
108	>	setState(1);
109	>	return true;
110		}
111		}
112
113	+	/**
114	+	* A runnable calling acquireInterruptibly that does not expect to
115	+	* be interrupted.
116	+	*/
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 lockInterruptibly that expects to be
127	<	* interrupted
126	>	* A runnable calling acquireInterruptibly that expects to be
127	>	* interrupted.
128		*/
129	<	class InterruptedLockRunnable implements Runnable {
130	<	final Mutex lock;
131	<	InterruptedLockRunnable(Mutex l) { lock = l; }
132	<	public void run() {
133	<	try {
99	<	lock.lockInterruptibly();
100	<	threadShouldThrow();
101	<	} catch(InterruptedException success){}
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	<
136	>
137	>	/** A constant to clarify calls to checking methods below. */
138	>	static final Thread[] NO_THREADS = new Thread[0];
139	>
140		/**
141	<	* locking an unlocked lock succeeds
141	>	* Spin-waits until sync.isQueued(t) becomes true.
142		*/
143	<	public void testLock() {
144	<	Mutex rl = new Mutex();
145	<	rl.lock();
146	<	assertTrue(rl.isLocked());
147	<	rl.unlock();
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
153		/**
154	<	* tryLock on an unlocked lock succeeds
154	>	* Checks that sync has exactly the given queued threads.
155		*/
156	<	public void testTryLock() {
157	<	Mutex rl = new Mutex();
158	<	assertTrue(rl.tryLock());
159	<	assertTrue(rl.isLocked());
160	<	rl.unlock();
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	<	* hasQueuedThreads reports whether there are waiting threads
168	>	* Checks that sync has exactly the given (exclusive) queued threads.
169		*/
170	<	public void testhasQueuedThreads() {
171	<	final Mutex lock = new Mutex();
172	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
173	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
174	<	try {
175	<	assertFalse(lock.hasQueuedThreads());
176	<	lock.lock();
177	<	t1.start();
178	<	Thread.sleep(SHORT_DELAY_MS);
179	<	assertTrue(lock.hasQueuedThreads());
180	<	t2.start();
181	<	Thread.sleep(SHORT_DELAY_MS);
182	<	assertTrue(lock.hasQueuedThreads());
183	<	t1.interrupt();
184	<	Thread.sleep(SHORT_DELAY_MS);
185	<	assertTrue(lock.hasQueuedThreads());
186	<	lock.unlock();
187	<	Thread.sleep(SHORT_DELAY_MS);
188	<	assertFalse(lock.hasQueuedThreads());
189	<	t1.join();
190	<	t2.join();
191	<	} catch(Exception e){
192	<	unexpectedException();
193	<	}
194	<	}
195	<
196	<	/**
197	<	* timed tryLock is interruptible.
198	<	*/
199	<	public void testInterruptedException2() {
158	<	final Mutex lock = new Mutex();
159	<	lock.lock();
160	<	Thread t = new Thread(new Runnable() {
161	<	public void run() {
162	<	try {
163	<	lock.tryLock(MEDIUM_DELAY_MS,TimeUnit.MILLISECONDS);
164	<	threadShouldThrow();
165	<	} catch(InterruptedException success){}
166	<	}
167	<	});
168	<	try {
169	<	t.start();
170	<	t.interrupt();
171	<	} catch(Exception e){
172	<	unexpectedException();
173	<	}
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	>	* Checks that sync has exactly the given (shared) queued threads.
181	>	*/
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	+	* 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	<	* TryLock on a locked lock fails
219	<	*/
220	<	public void testTryLockWhenLocked() {
221	<	final Mutex lock = new Mutex();
222	<	lock.lock();
223	<	Thread t = new Thread(new Runnable() {
224	<	public void run() {
225	<	threadAssertFalse(lock.tryLock());
226	<	}
227	<	});
228	<	try {
229	<	t.start();
230	<	t.join();
231	<	lock.unlock();
232	<	} catch(Exception e){
233	<	unexpectedException();
234	<	}
235	<	}
236	<
237	<	/**
238	<	* Timed tryLock on a locked lock times out
239	<	*/
200	<	public void testTryLock_Timeout() {
201	<	final Mutex lock = new Mutex();
202	<	lock.lock();
203	<	Thread t = new Thread(new Runnable() {
204	<	public void run() {
205	<	try {
206	<	threadAssertFalse(lock.tryLock(1, TimeUnit.MILLISECONDS));
207	<	} catch (Exception ex) {
208	<	threadUnexpectedException();
209	<	}
210	<	}
211	<	});
212	<	try {
213	<	t.start();
214	<	t.join();
215	<	lock.unlock();
216	<	} catch(Exception e){
217	<	unexpectedException();
218	<	}
219	<	}
220	<
221	<
222	<	/**
223	<	* isLocked is true when locked and false when not
224	<	*/
225	<	public void testIsLocked() {
226	<	final Mutex lock = new Mutex();
227	<	lock.lock();
228	<	assertTrue(lock.isLocked());
229	<	lock.unlock();
230	<	assertFalse(lock.isLocked());
231	<	Thread t = new Thread(new Runnable() {
232	<	public void run() {
233	<	lock.lock();
234	<	try {
235	<	Thread.sleep(SMALL_DELAY_MS);
236	<	}
237	<	catch(Exception e) {
238	<	threadUnexpectedException();
239	<	}
240	<	lock.unlock();
241	<	}
242	<	});
243	<	try {
244	<	t.start();
245	<	Thread.sleep(SHORT_DELAY_MS);
246	<	assertTrue(lock.isLocked());
247	<	t.join();
248	<	assertFalse(lock.isLocked());
249	<	} catch(Exception e){
250	<	unexpectedException();
218	>	* Awaits condition using the specified AwaitMethod.
219	>	*/
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	+	* 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	<	* lockInterruptibly is interruptible.
331	<	*/
332	<	public void testLockInterruptibly1() {
333	<	final Mutex lock = new Mutex();
260	<	lock.lock();
261	<	Thread t = new Thread(new InterruptedLockRunnable(lock));
262	<	try {
263	<	t.start();
264	<	t.interrupt();
265	<	lock.unlock();
266	<	t.join();
267	<	} catch(Exception e){
268	<	unexpectedException();
269	<	}
270	<	}
271	<
272	<	/**
273	<	* lockInterruptibly succeeds when unlocked, else is interruptible
274	<	*/
275	<	public void testLockInterruptibly2() {
276	<	final Mutex lock = new Mutex();
277	<	try {
278	<	lock.lockInterruptibly();
279	<	} catch(Exception e) {
280	<	unexpectedException();
281	<	}
282	<	Thread t = new Thread(new InterruptedLockRunnable(lock));
283	<	try {
284	<	t.start();
285	<	t.interrupt();
286	<	assertTrue(lock.isLocked());
287	<	t.join();
288	<	} catch(Exception e){
289	<	unexpectedException();
290	<	}
291	<	}
292	<
293	<	/**
294	<	* Calling await without holding lock throws IllegalMonitorStateException
295	<	*/
296	<	public void testAwait_IllegalMonitor() {
297	<	final Mutex lock = new Mutex();
298	<	final Condition c = lock.newCondition();
330	>	* isQueued(null) throws NullPointerException
331	>	*/
332	>	public void testIsQueuedNPE() {
333	>	final Mutex sync = new Mutex();
334		try {
335	<	c.await();
335	>	sync.isQueued(null);
336		shouldThrow();
337	<	}
338	<	catch (IllegalMonitorStateException success) {
339	<	}
340	<	catch (Exception ex) {
341	<	unexpectedException();
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 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	>	* 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	<	* Calling signal without holding lock throws IllegalMonitorStateException
640	>	* Calling signal without holding sync throws IllegalMonitorStateException
641		*/
642	<	public void testSignal_IllegalMonitor() {
643	<	final Mutex lock = new Mutex();
644	<	final Condition c = lock.newCondition();
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	<	}
649	<	catch (IllegalMonitorStateException success) {
321	<	}
322	<	catch (Exception ex) {
323	<	unexpectedException();
324	<	}
648	>	} catch (IllegalMonitorStateException success) {}
649	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
650		}
651
652		/**
653	<	* awaitNanos without a signal times out
653	>	* Calling signalAll without holding sync throws IllegalMonitorStateException
654		*/
655	<	public void testAwaitNanos_Timeout() {
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	<	lock.lock();
660	<	long t = c.awaitNanos(100);
661	<	assertTrue(t <= 0);
337	<	lock.unlock();
338	<	}
339	<	catch (Exception ex) {
340	<	unexpectedException();
341	<	}
659	>	c.signalAll();
660	>	shouldThrow();
661	>	} catch (IllegalMonitorStateException success) {}
662		}
663
664		/**
665	<	*  timed await without a signal times out
665	>	* await/awaitNanos/awaitUntil without a signal times out
666		*/
667	<	public void testAwait_Timeout() {
668	<	final Mutex lock = new Mutex();
669	<	final Condition c = lock.newCondition();
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	>	* hasWaiters(null) throws NullPointerException
710	>	*/
711	>	public void testHasWaitersNPE() {
712	>	final Mutex sync = new Mutex();
713		try {
714	<	lock.lock();
715	<	assertFalse(c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
716	<	lock.unlock();
354	<	}
355	<	catch (Exception ex) {
356	<	unexpectedException();
357	<	}
714	>	sync.hasWaiters(null);
715	>	shouldThrow();
716	>	} catch (NullPointerException success) {}
717		}
718
719		/**
720	<	* awaitUntil without a signal times out
720	>	* getWaitQueueLength(null) throws NullPointerException
721		*/
722	<	public void testAwaitUntil_Timeout() {
723	<	final Mutex lock = new Mutex();
365	<	final Condition c = lock.newCondition();
722	>	public void testGetWaitQueueLengthNPE() {
723	>	final Mutex sync = new Mutex();
724		try {
725	<	lock.lock();
726	<	java.util.Date d = new java.util.Date();
727	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
370	<	lock.unlock();
371	<	}
372	<	catch (Exception ex) {
373	<	unexpectedException();
374	<	}
725	>	sync.getWaitQueueLength(null);
726	>	shouldThrow();
727	>	} catch (NullPointerException success) {}
728		}
729
730		/**
731	<	* await returns when signalled
731	>	* getWaitingThreads(null) throws NullPointerException
732		*/
733	<	public void testAwait() {
734	<	final Mutex lock = new Mutex();
735	<	final Condition c = lock.newCondition();
736	<	Thread t = new Thread(new Runnable() {
737	<	public void run() {
738	<	try {
739	<	lock.lock();
387	<	c.await();
388	<	lock.unlock();
389	<	}
390	<	catch(InterruptedException e) {
391	<	threadUnexpectedException();
392	<	}
393	<	}
394	<	});
733	>	public void testGetWaitingThreadsNPE() {
734	>	final Mutex sync = new Mutex();
735	>	try {
736	>	sync.getWaitingThreads(null);
737	>	shouldThrow();
738	>	} catch (NullPointerException success) {}
739	>	}
740
741	+	/**
742	+	* hasWaiters throws IllegalArgumentException if not owned
743	+	*/
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	<	t.start();
750	<	Thread.sleep(SHORT_DELAY_MS);
751	<	lock.lock();
752	<	c.signal();
753	<	lock.unlock();
754	<	t.join(SHORT_DELAY_MS);
755	<	assertFalse(t.isAlive());
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	>	* getWaitQueueLength throws IllegalArgumentException if not owned
770	>	*/
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	>	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	>	* getWaitingThreads throws IllegalMonitorStateException if not synced
811	>	*/
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	>	* 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	>	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();
1132	>
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	>
1151	>	/**
1152	>	* tryAcquireSharedNanos returns after release, but not before
1153	>	*/
1154	>	public void testTryAcquireSharedNanos() {
1155	>	final BooleanLatch l = new BooleanLatch();
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	>	* acquireSharedInterruptibly is interruptible
1177	>	*/
1178	>	public void testAcquireSharedInterruptibly_Interruptible() {
1179	>	final BooleanLatch l = new BooleanLatch();
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	>	* tryAcquireSharedNanos times out if not released before timeout
1214	>	*/
1215	>	public void testTryAcquireSharedNanos_Timeout() {
1216	>	final BooleanLatch l = new BooleanLatch();
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	>	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	<	catch (Exception ex) {
1277	<	unexpectedException();
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	>
1310	>	/**
1311	>	* Tests scenario for
1312	>	* JDK-8191937: Lost interrupt in AbstractQueuedSynchronizer when tryAcquire methods throw
1313	>	*/
1314	>	public void testInterruptedFailingAcquire() throws InterruptedException {
1315	>	final RuntimeException ex = new RuntimeException();
1316	>
1317	>	// A synchronizer only offering a choice of failure modes
1318	>	class Sync extends AbstractQueuedSynchronizer {
1319	>	boolean pleaseThrow;
1320	>	@Override protected boolean tryAcquire(int ignored) {
1321	>	if (pleaseThrow) throw ex;
1322	>	return false;
1323	>	}
1324	>	@Override protected int tryAcquireShared(int ignored) {
1325	>	if (pleaseThrow) throw ex;
1326	>	return -1;
1327	>	}
1328	>	@Override protected boolean tryRelease(int ignored) {
1329	>	return true;
1330	>	}
1331	>	@Override protected boolean tryReleaseShared(int ignored) {
1332	>	return true;
1333	>	}
1334		}
1335	+
1336	+	final Sync s = new Sync();
1337	+
1338	+	final Thread thread = newStartedThread(new CheckedRunnable() {
1339	+	public void realRun() {
1340	+	try {
1341	+	if (randomBoolean())
1342	+	s.acquire(1);
1343	+	else
1344	+	s.acquireShared(1);
1345	+	shouldThrow();
1346	+	} catch (Throwable t) {
1347	+	assertSame(ex, t);
1348	+	assertTrue(Thread.interrupted());
1349	+	}
1350	+	}});
1351	+	waitForThreadToEnterWaitState(thread);
1352	+	assertSame(thread, s.getFirstQueuedThread());
1353	+	assertTrue(s.hasQueuedPredecessors());
1354	+	assertTrue(s.hasQueuedThreads());
1355	+	assertEquals(1, s.getQueueLength());
1356	+
1357	+	s.pleaseThrow = true;
1358	+	thread.interrupt();
1359	+	s.release(1);
1360	+	awaitTermination(thread);
1361		}
1362	<
1362	>
1363		}

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