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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 1.48 by jsr166, Wed Dec 31 20:34:16 2014 UTC

#	Line 1 | Line 1
1		/*
2		* Written by Doug Lea with assistance from members of JCP JSR-166
3		* Expert Group and released to the public domain, as explained at
4	<	* http://creativecommons.org/licenses/publicdomain
5	<	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	<	* Pat Fisher, Mike Judd.
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9	+	import static java.util.concurrent.TimeUnit.MILLISECONDS;
10	+	import static java.util.concurrent.TimeUnit.NANOSECONDS;
11
12	<	import junit.framework.*;
13	<	import java.util.*;
14	<	import java.util.concurrent.*;
15	<	import java.util.concurrent.locks.*;
16	<	import java.io.*;
12	>	import java.util.Arrays;
13	>	import java.util.Collection;
14	>	import java.util.HashSet;
15	>	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
16	>	import java.util.concurrent.locks.AbstractQueuedSynchronizer.ConditionObject;
17	>
18	>	import junit.framework.AssertionFailedError;
19	>	import junit.framework.Test;
20	>	import junit.framework.TestSuite;
21
22		public class AbstractQueuedSynchronizerTest extends JSR166TestCase {
23		public static void main(String[] args) {
24	<	junit.textui.TestRunner.run (suite());
24	>	junit.textui.TestRunner.run(suite());
25		}
26		public static Test suite() {
27		return new TestSuite(AbstractQueuedSynchronizerTest.class);
28		}
29
30		/**
31	<	* A simple mutex class, adapted from the
32	<	* AbstractQueuedSynchronizer javadoc.  Exclusive acquire tests
33	<	* exercise this as a sample user extension.  Other
34	<	* methods/features of AbstractQueuedSynchronizerTest are tested
35	<	* via other test classes, including those for ReentrantLock,
30	<	* ReentrantReadWriteLock, and Semaphore
31	>	* A simple mutex class, adapted from the class javadoc.  Exclusive
32	>	* acquire tests exercise this as a sample user extension.  Other
33	>	* methods/features of AbstractQueuedSynchronizer are tested via
34	>	* other test classes, including those for ReentrantLock,
35	>	* ReentrantReadWriteLock, and Semaphore.
36		*/
37		static class Mutex extends AbstractQueuedSynchronizer {
38	<	public boolean isLocked() { return getState() == 1; }
39	<
40	<	public boolean tryAcquireExclusive(int acquires) {
41	<	assertTrue(acquires == 1);
42	<	return compareAndSetState(0, 1);
43	<	}
44	<
45	<	public boolean tryReleaseExclusive(int releases) {
46	<	setState(0);
38	>	/** An eccentric value for locked synchronizer state. */
39	>	static final int LOCKED = (1 << 31) | (1 << 15);
40	>
41	>	static final int UNLOCKED = 0;
42	>
43	>	@Override public boolean isHeldExclusively() {
44	>	int state = getState();
45	>	assertTrue(state == UNLOCKED || state == LOCKED);
46	>	return state == LOCKED;
47	>	}
48	>
49	>	@Override public boolean tryAcquire(int acquires) {
50	>	assertEquals(LOCKED, acquires);
51	>	return compareAndSetState(UNLOCKED, LOCKED);
52	>	}
53	>
54	>	@Override public boolean tryRelease(int releases) {
55	>	if (getState() != LOCKED) throw new IllegalMonitorStateException();
56	>	assertEquals(LOCKED, releases);
57	>	setState(UNLOCKED);
58		return true;
59		}
60	<
61	<	public void checkConditionAccess(Thread thread) {
62	<	if (getState() == 0) throw new IllegalMonitorStateException();
60	>
61	>	public boolean tryAcquireNanos(long nanos) throws InterruptedException {
62	>	return tryAcquireNanos(LOCKED, nanos);
63	>	}
64	>
65	>	public boolean tryAcquire() {
66	>	return tryAcquire(LOCKED);
67		}
68	<
69	<	public ConditionObject newCondition() { return new ConditionObject(); }
70	<
71	<	public void lock() {
72	<	acquireExclusiveUninterruptibly(1);
68	>
69	>	public boolean tryRelease() {
70	>	return tryRelease(LOCKED);
71	>	}
72	>
73	>	public void acquire() {
74	>	acquire(LOCKED);
75		}
76
77	+	public void acquireInterruptibly() throws InterruptedException {
78	+	acquireInterruptibly(LOCKED);
79	+	}
80	+
81	+	public void release() {
82	+	release(LOCKED);
83	+	}
84	+
85	+	public ConditionObject newCondition() {
86	+	return new ConditionObject();
87	+	}
88		}
89
57	–
90		/**
91		* A simple latch class, to test shared mode.
92		*/
93	<	static class BooleanLatch extends AbstractQueuedSynchronizer {
93	>	static class BooleanLatch extends AbstractQueuedSynchronizer {
94		public boolean isSignalled() { return getState() != 0; }
95
96		public int tryAcquireShared(int ignore) {
97	<	return isSignalled()? 1 : -1;
97	>	return isSignalled() ? 1 : -1;
98		}
99	<
99	>
100		public boolean tryReleaseShared(int ignore) {
101		setState(1);
102		return true;
#	Line 72 | Line 104 | public class AbstractQueuedSynchronizerT
104		}
105
106		/**
107	<	* A runnable calling acquireExclusiveInterruptibly
107	>	* A runnable calling acquireInterruptibly that does not expect to
108	>	* be interrupted.
109		*/
110	<	class InterruptibleLockRunnable implements Runnable {
111	<	final Mutex lock;
112	<	InterruptibleLockRunnable(Mutex l) { lock = l; }
113	<	public void run() {
114	<	try {
82	<	lock.acquireExclusiveInterruptibly(1);
83	<	} catch(InterruptedException success){}
110	>	class InterruptibleSyncRunnable extends CheckedRunnable {
111	>	final Mutex sync;
112	>	InterruptibleSyncRunnable(Mutex sync) { this.sync = sync; }
113	>	public void realRun() throws InterruptedException {
114	>	sync.acquireInterruptibly();
115		}
116		}
117
118	+	/**
119	+	* A runnable calling acquireInterruptibly that expects to be
120	+	* interrupted.
121	+	*/
122	+	class InterruptedSyncRunnable extends CheckedInterruptedRunnable {
123	+	final Mutex sync;
124	+	InterruptedSyncRunnable(Mutex sync) { this.sync = sync; }
125	+	public void realRun() throws InterruptedException {
126	+	sync.acquireInterruptibly();
127	+	}
128	+	}
129	+
130	+	/** A constant to clarify calls to checking methods below. */
131	+	static final Thread[] NO_THREADS = new Thread[0];
132
133		/**
134	<	* A runnable calling acquireExclusiveInterruptibly that expects to be
90	<	* interrupted
134	>	* Spin-waits until sync.isQueued(t) becomes true.
135		*/
136	<	class InterruptedLockRunnable implements Runnable {
137	<	final Mutex lock;
138	<	InterruptedLockRunnable(Mutex l) { lock = l; }
139	<	public void run() {
140	<	try {
141	<	lock.acquireExclusiveInterruptibly(1);
98	<	threadShouldThrow();
99	<	} catch(InterruptedException success){}
136	>	void waitForQueuedThread(AbstractQueuedSynchronizer sync, Thread t) {
137	>	long startTime = System.nanoTime();
138	>	while (!sync.isQueued(t)) {
139	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
140	>	throw new AssertionFailedError("timed out");
141	>	Thread.yield();
142		}
143	+	assertTrue(t.isAlive());
144		}
145	<
145	>
146		/**
147	<	* acquireExclusiveUninterruptiblying an releaseExclusiveed lock succeeds
147	>	* Checks that sync has exactly the given queued threads.
148		*/
149	<	public void testAcquireExclusiveUninterruptibly() {
150	<	Mutex rl = new Mutex();
151	<	rl.acquireExclusiveUninterruptibly(1);
152	<	assertTrue(rl.isLocked());
153	<	rl.releaseExclusive(1);
149	>	void assertHasQueuedThreads(AbstractQueuedSynchronizer sync,
150	>	Thread... expected) {
151	>	Collection<Thread> actual = sync.getQueuedThreads();
152	>	assertEquals(expected.length > 0, sync.hasQueuedThreads());
153	>	assertEquals(expected.length, sync.getQueueLength());
154	>	assertEquals(expected.length, actual.size());
155	>	assertEquals(expected.length == 0, actual.isEmpty());
156	>	assertEquals(new HashSet<Thread>(actual),
157	>	new HashSet<Thread>(Arrays.asList(expected)));
158		}
159
160		/**
161	<	* tryAcquireExclusive on an releaseExclusiveed lock succeeds
161	>	* Checks that sync has exactly the given (exclusive) queued threads.
162		*/
163	<	public void testTryAcquireExclusive() {
164	<	Mutex rl = new Mutex();
165	<	assertTrue(rl.tryAcquireExclusive(1));
166	<	assertTrue(rl.isLocked());
167	<	rl.releaseExclusive(1);
163	>	void assertHasExclusiveQueuedThreads(AbstractQueuedSynchronizer sync,
164	>	Thread... expected) {
165	>	assertHasQueuedThreads(sync, expected);
166	>	assertEquals(new HashSet<Thread>(sync.getExclusiveQueuedThreads()),
167	>	new HashSet<Thread>(sync.getQueuedThreads()));
168	>	assertEquals(0, sync.getSharedQueuedThreads().size());
169	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
170		}
171
172		/**
173	<	* hasQueuedThreads reports whether there are waiting threads
173	>	* Checks that sync has exactly the given (shared) queued threads.
174		*/
175	<	public void testhasQueuedThreads() {
176	<	final Mutex lock = new Mutex();
177	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
178	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
179	<	try {
180	<	assertFalse(lock.hasQueuedThreads());
181	<	lock.acquireExclusiveUninterruptibly(1);
182	<	t1.start();
134	<	Thread.sleep(SHORT_DELAY_MS);
135	<	assertTrue(lock.hasQueuedThreads());
136	<	t2.start();
137	<	Thread.sleep(SHORT_DELAY_MS);
138	<	assertTrue(lock.hasQueuedThreads());
139	<	t1.interrupt();
140	<	Thread.sleep(SHORT_DELAY_MS);
141	<	assertTrue(lock.hasQueuedThreads());
142	<	lock.releaseExclusive(1);
143	<	Thread.sleep(SHORT_DELAY_MS);
144	<	assertFalse(lock.hasQueuedThreads());
145	<	t1.join();
146	<	t2.join();
147	<	} catch(Exception e){
148	<	unexpectedException();
149	<	}
150	<	}
151	<
152	<	/**
153	<	* isQueued(null) throws NPE
154	<	*/
155	<	public void testIsQueuedNPE() {
156	<	final Mutex lock = new Mutex();
157	<	try {
158	<	lock.isQueued(null);
159	<	shouldThrow();
160	<	} catch (NullPointerException success) {
161	<	}
162	<	}
163	<
164	<	/**
165	<	* isQueued reports whether a thread is queued.
166	<	*/
167	<	public void testIsQueued() {
168	<	final Mutex lock = new Mutex();
169	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
170	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
171	<	try {
172	<	assertFalse(lock.isQueued(t1));
173	<	assertFalse(lock.isQueued(t2));
174	<	lock.acquireExclusiveUninterruptibly(1);
175	<	t1.start();
176	<	Thread.sleep(SHORT_DELAY_MS);
177	<	assertTrue(lock.isQueued(t1));
178	<	t2.start();
179	<	Thread.sleep(SHORT_DELAY_MS);
180	<	assertTrue(lock.isQueued(t1));
181	<	assertTrue(lock.isQueued(t2));
182	<	t1.interrupt();
183	<	Thread.sleep(SHORT_DELAY_MS);
184	<	assertFalse(lock.isQueued(t1));
185	<	assertTrue(lock.isQueued(t2));
186	<	lock.releaseExclusive(1);
187	<	Thread.sleep(SHORT_DELAY_MS);
188	<	assertFalse(lock.isQueued(t1));
189	<	assertFalse(lock.isQueued(t2));
190	<	t1.join();
191	<	t2.join();
192	<	} catch(Exception e){
193	<	unexpectedException();
194	<	}
195	<	}
196	<
197	<	/**
198	<	* getFirstQueuedThread returns first waiting thread or null is none
199	<	*/
200	<	public void testGetFirstQueuedThread() {
201	<	final Mutex lock = new Mutex();
202	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
203	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
204	<	try {
205	<	assertNull(lock.getFirstQueuedThread());
206	<	lock.acquireExclusiveUninterruptibly(1);
207	<	t1.start();
208	<	Thread.sleep(SHORT_DELAY_MS);
209	<	assertEquals(t1, lock.getFirstQueuedThread());
210	<	t2.start();
211	<	Thread.sleep(SHORT_DELAY_MS);
212	<	assertEquals(t1, lock.getFirstQueuedThread());
213	<	t1.interrupt();
214	<	Thread.sleep(SHORT_DELAY_MS);
215	<	assertEquals(t2, lock.getFirstQueuedThread());
216	<	lock.releaseExclusive(1);
217	<	Thread.sleep(SHORT_DELAY_MS);
218	<	assertNull(lock.getFirstQueuedThread());
219	<	t1.join();
220	<	t2.join();
221	<	} catch(Exception e){
222	<	unexpectedException();
223	<	}
224	<	}
175	>	void assertHasSharedQueuedThreads(AbstractQueuedSynchronizer sync,
176	>	Thread... expected) {
177	>	assertHasQueuedThreads(sync, expected);
178	>	assertEquals(new HashSet<Thread>(sync.getSharedQueuedThreads()),
179	>	new HashSet<Thread>(sync.getQueuedThreads()));
180	>	assertEquals(0, sync.getExclusiveQueuedThreads().size());
181	>	assertTrue(sync.getExclusiveQueuedThreads().isEmpty());
182	>	}
183
184	+	/**
185	+	* Checks that condition c has exactly the given waiter threads,
186	+	* after acquiring mutex.
187	+	*/
188	+	void assertHasWaitersUnlocked(Mutex sync, ConditionObject c,
189	+	Thread... threads) {
190	+	sync.acquire();
191	+	assertHasWaitersLocked(sync, c, threads);
192	+	sync.release();
193	+	}
194
195		/**
196	<	* hasContended reports false if no thread has ever blocked, else true
196	>	* Checks that condition c has exactly the given waiter threads.
197	>	*/
198	>	void assertHasWaitersLocked(Mutex sync, ConditionObject c,
199	>	Thread... threads) {
200	>	assertEquals(threads.length > 0, sync.hasWaiters(c));
201	>	assertEquals(threads.length, sync.getWaitQueueLength(c));
202	>	assertEquals(threads.length == 0, sync.getWaitingThreads(c).isEmpty());
203	>	assertEquals(threads.length, sync.getWaitingThreads(c).size());
204	>	assertEquals(new HashSet<Thread>(sync.getWaitingThreads(c)),
205	>	new HashSet<Thread>(Arrays.asList(threads)));
206	>	}
207	>
208	>	enum AwaitMethod { await, awaitTimed, awaitNanos, awaitUntil }
209	>
210	>	/**
211	>	* Awaits condition using the specified AwaitMethod.
212		*/
213	<	public void testHasContended() {
214	<	final Mutex lock = new Mutex();
215	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
216	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
217	<	try {
218	<	assertFalse(lock.hasContended());
219	<	lock.acquireExclusiveUninterruptibly(1);
220	<	t1.start();
221	<	Thread.sleep(SHORT_DELAY_MS);
222	<	assertTrue(lock.hasContended());
223	<	t2.start();
224	<	Thread.sleep(SHORT_DELAY_MS);
225	<	assertTrue(lock.hasContended());
226	<	t1.interrupt();
227	<	Thread.sleep(SHORT_DELAY_MS);
228	<	assertTrue(lock.hasContended());
229	<	lock.releaseExclusive(1);
230	<	Thread.sleep(SHORT_DELAY_MS);
231	<	assertTrue(lock.hasContended());
232	<	t1.join();
250	<	t2.join();
251	<	} catch(Exception e){
252	<	unexpectedException();
253	<	}
254	<	}
255	<
256	<	/**
257	<	* acquireExclusiveNanos is interruptible.
258	<	*/
259	<	public void testInterruptedException2() {
260	<	final Mutex lock = new Mutex();
261	<	lock.acquireExclusiveUninterruptibly(1);
262	<	Thread t = new Thread(new Runnable() {
263	<	public void run() {
264	<	try {
265	<	lock.acquireExclusiveNanos(1, MEDIUM_DELAY_MS * 1000 * 1000);
266	<	threadShouldThrow();
267	<	} catch(InterruptedException success){}
268	<	}
269	<	});
270	<	try {
271	<	t.start();
272	<	t.interrupt();
273	<	} catch(Exception e){
274	<	unexpectedException();
213	>	void await(ConditionObject c, AwaitMethod awaitMethod)
214	>	throws InterruptedException {
215	>	long timeoutMillis = 2 * LONG_DELAY_MS;
216	>	switch (awaitMethod) {
217	>	case await:
218	>	c.await();
219	>	break;
220	>	case awaitTimed:
221	>	assertTrue(c.await(timeoutMillis, MILLISECONDS));
222	>	break;
223	>	case awaitNanos:
224	>	long nanosTimeout = MILLISECONDS.toNanos(timeoutMillis);
225	>	long nanosRemaining = c.awaitNanos(nanosTimeout);
226	>	assertTrue(nanosRemaining > 0);
227	>	break;
228	>	case awaitUntil:
229	>	assertTrue(c.awaitUntil(delayedDate(timeoutMillis)));
230	>	break;
231	>	default:
232	>	throw new AssertionError();
233		}
234		}
235
236	+	/**
237	+	* Checks that awaiting the given condition times out (using the
238	+	* default timeout duration).
239	+	*/
240	+	void assertAwaitTimesOut(ConditionObject c, AwaitMethod awaitMethod) {
241	+	long timeoutMillis = timeoutMillis();
242	+	long startTime = System.nanoTime();
243	+	try {
244	+	switch (awaitMethod) {
245	+	case awaitTimed:
246	+	assertFalse(c.await(timeoutMillis, MILLISECONDS));
247	+	break;
248	+	case awaitNanos:
249	+	long nanosTimeout = MILLISECONDS.toNanos(timeoutMillis);
250	+	long nanosRemaining = c.awaitNanos(nanosTimeout);
251	+	assertTrue(nanosRemaining <= 0);
252	+	break;
253	+	case awaitUntil:
254	+	assertFalse(c.awaitUntil(delayedDate(timeoutMillis)));
255	+	break;
256	+	default:
257	+	throw new UnsupportedOperationException();
258	+	}
259	+	} catch (InterruptedException ie) { threadUnexpectedException(ie); }
260	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
261	+	}
262	+
263	+	/**
264	+	* isHeldExclusively is false upon construction
265	+	*/
266	+	public void testIsHeldExclusively() {
267	+	Mutex sync = new Mutex();
268	+	assertFalse(sync.isHeldExclusively());
269	+	}
270	+
271	+	/**
272	+	* acquiring released sync succeeds
273	+	*/
274	+	public void testAcquire() {
275	+	Mutex sync = new Mutex();
276	+	sync.acquire();
277	+	assertTrue(sync.isHeldExclusively());
278	+	sync.release();
279	+	assertFalse(sync.isHeldExclusively());
280	+	}
281	+
282	+	/**
283	+	* tryAcquire on a released sync succeeds
284	+	*/
285	+	public void testTryAcquire() {
286	+	Mutex sync = new Mutex();
287	+	assertTrue(sync.tryAcquire());
288	+	assertTrue(sync.isHeldExclusively());
289	+	sync.release();
290	+	assertFalse(sync.isHeldExclusively());
291	+	}
292
293		/**
294	<	* TryAcquireExclusive on a locked lock fails
295	<	*/
296	<	public void testTryAcquireExclusiveWhenLocked() {
297	<	final Mutex lock = new Mutex();
298	<	lock.acquireExclusiveUninterruptibly(1);
299	<	Thread t = new Thread(new Runnable() {
300	<	public void run() {
301	<	threadAssertFalse(lock.tryAcquireExclusive(1));
302	<	}
303	<	});
304	<	try {
305	<	t.start();
306	<	t.join();
307	<	lock.releaseExclusive(1);
308	<	} catch(Exception e){
309	<	unexpectedException();
310	<	}
311	<	}
312	<
313	<	/**
314	<	* acquireExclusiveNanos on a locked lock times out
315	<	*/
316	<	public void testAcquireExclusiveNanos_Timeout() {
317	<	final Mutex lock = new Mutex();
318	<	lock.acquireExclusiveUninterruptibly(1);
319	<	Thread t = new Thread(new Runnable() {
320	<	public void run() {
321	<	try {
322	<	threadAssertFalse(lock.acquireExclusiveNanos(1, 1000 * 1000));
323	<	} catch (Exception ex) {
324	<	threadUnexpectedException();
325	<	}
326	<	}
327	<	});
328	<	try {
329	<	t.start();
330	<	t.join();
331	<	lock.releaseExclusive(1);
332	<	} catch(Exception e){
333	<	unexpectedException();
334	<	}
335	<	}
336	<
337	<
294	>	* hasQueuedThreads reports whether there are waiting threads
295	>	*/
296	>	public void testHasQueuedThreads() {
297	>	final Mutex sync = new Mutex();
298	>	assertFalse(sync.hasQueuedThreads());
299	>	sync.acquire();
300	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
301	>	waitForQueuedThread(sync, t1);
302	>	assertTrue(sync.hasQueuedThreads());
303	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
304	>	waitForQueuedThread(sync, t2);
305	>	assertTrue(sync.hasQueuedThreads());
306	>	t1.interrupt();
307	>	awaitTermination(t1);
308	>	assertTrue(sync.hasQueuedThreads());
309	>	sync.release();
310	>	awaitTermination(t2);
311	>	assertFalse(sync.hasQueuedThreads());
312	>	}
313	>
314	>	/**
315	>	* isQueued(null) throws NullPointerException
316	>	*/
317	>	public void testIsQueuedNPE() {
318	>	final Mutex sync = new Mutex();
319	>	try {
320	>	sync.isQueued(null);
321	>	shouldThrow();
322	>	} catch (NullPointerException success) {}
323	>	}
324	>
325	>	/**
326	>	* isQueued reports whether a thread is queued
327	>	*/
328	>	public void testIsQueued() {
329	>	final Mutex sync = new Mutex();
330	>	Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
331	>	Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
332	>	assertFalse(sync.isQueued(t1));
333	>	assertFalse(sync.isQueued(t2));
334	>	sync.acquire();
335	>	t1.start();
336	>	waitForQueuedThread(sync, t1);
337	>	assertTrue(sync.isQueued(t1));
338	>	assertFalse(sync.isQueued(t2));
339	>	t2.start();
340	>	waitForQueuedThread(sync, t2);
341	>	assertTrue(sync.isQueued(t1));
342	>	assertTrue(sync.isQueued(t2));
343	>	t1.interrupt();
344	>	awaitTermination(t1);
345	>	assertFalse(sync.isQueued(t1));
346	>	assertTrue(sync.isQueued(t2));
347	>	sync.release();
348	>	awaitTermination(t2);
349	>	assertFalse(sync.isQueued(t1));
350	>	assertFalse(sync.isQueued(t2));
351	>	}
352	>
353	>	/**
354	>	* getFirstQueuedThread returns first waiting thread or null if none
355	>	*/
356	>	public void testGetFirstQueuedThread() {
357	>	final Mutex sync = new Mutex();
358	>	assertNull(sync.getFirstQueuedThread());
359	>	sync.acquire();
360	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
361	>	waitForQueuedThread(sync, t1);
362	>	assertEquals(t1, sync.getFirstQueuedThread());
363	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
364	>	waitForQueuedThread(sync, t2);
365	>	assertEquals(t1, sync.getFirstQueuedThread());
366	>	t1.interrupt();
367	>	awaitTermination(t1);
368	>	assertEquals(t2, sync.getFirstQueuedThread());
369	>	sync.release();
370	>	awaitTermination(t2);
371	>	assertNull(sync.getFirstQueuedThread());
372	>	}
373	>
374	>	/**
375	>	* hasContended reports false if no thread has ever blocked, else true
376	>	*/
377	>	public void testHasContended() {
378	>	final Mutex sync = new Mutex();
379	>	assertFalse(sync.hasContended());
380	>	sync.acquire();
381	>	assertFalse(sync.hasContended());
382	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
383	>	waitForQueuedThread(sync, t1);
384	>	assertTrue(sync.hasContended());
385	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
386	>	waitForQueuedThread(sync, t2);
387	>	assertTrue(sync.hasContended());
388	>	t1.interrupt();
389	>	awaitTermination(t1);
390	>	assertTrue(sync.hasContended());
391	>	sync.release();
392	>	awaitTermination(t2);
393	>	assertTrue(sync.hasContended());
394	>	}
395	>
396	>	/**
397	>	* getQueuedThreads returns all waiting threads
398	>	*/
399	>	public void testGetQueuedThreads() {
400	>	final Mutex sync = new Mutex();
401	>	Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
402	>	Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
403	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
404	>	sync.acquire();
405	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
406	>	t1.start();
407	>	waitForQueuedThread(sync, t1);
408	>	assertHasExclusiveQueuedThreads(sync, t1);
409	>	assertTrue(sync.getQueuedThreads().contains(t1));
410	>	assertFalse(sync.getQueuedThreads().contains(t2));
411	>	t2.start();
412	>	waitForQueuedThread(sync, t2);
413	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
414	>	assertTrue(sync.getQueuedThreads().contains(t1));
415	>	assertTrue(sync.getQueuedThreads().contains(t2));
416	>	t1.interrupt();
417	>	awaitTermination(t1);
418	>	assertHasExclusiveQueuedThreads(sync, t2);
419	>	sync.release();
420	>	awaitTermination(t2);
421	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
422	>	}
423	>
424	>	/**
425	>	* getExclusiveQueuedThreads returns all exclusive waiting threads
426	>	*/
427	>	public void testGetExclusiveQueuedThreads() {
428	>	final Mutex sync = new Mutex();
429	>	Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
430	>	Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
431	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
432	>	sync.acquire();
433	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
434	>	t1.start();
435	>	waitForQueuedThread(sync, t1);
436	>	assertHasExclusiveQueuedThreads(sync, t1);
437	>	assertTrue(sync.getExclusiveQueuedThreads().contains(t1));
438	>	assertFalse(sync.getExclusiveQueuedThreads().contains(t2));
439	>	t2.start();
440	>	waitForQueuedThread(sync, t2);
441	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
442	>	assertTrue(sync.getExclusiveQueuedThreads().contains(t1));
443	>	assertTrue(sync.getExclusiveQueuedThreads().contains(t2));
444	>	t1.interrupt();
445	>	awaitTermination(t1);
446	>	assertHasExclusiveQueuedThreads(sync, t2);
447	>	sync.release();
448	>	awaitTermination(t2);
449	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
450	>	}
451	>
452	>	/**
453	>	* getSharedQueuedThreads does not include exclusively waiting threads
454	>	*/
455	>	public void testGetSharedQueuedThreads_Exclusive() {
456	>	final Mutex sync = new Mutex();
457	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
458	>	sync.acquire();
459	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
460	>	Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync));
461	>	waitForQueuedThread(sync, t1);
462	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
463	>	Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync));
464	>	waitForQueuedThread(sync, t2);
465	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
466	>	t1.interrupt();
467	>	awaitTermination(t1);
468	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
469	>	sync.release();
470	>	awaitTermination(t2);
471	>	assertTrue(sync.getSharedQueuedThreads().isEmpty());
472	>	}
473	>
474	>	/**
475	>	* getSharedQueuedThreads returns all shared waiting threads
476	>	*/
477	>	public void testGetSharedQueuedThreads_Shared() {
478	>	final BooleanLatch l = new BooleanLatch();
479	>	assertHasSharedQueuedThreads(l, NO_THREADS);
480	>	Thread t1 = newStartedThread(new CheckedInterruptedRunnable() {
481	>	public void realRun() throws InterruptedException {
482	>	l.acquireSharedInterruptibly(0);
483	>	}});
484	>	waitForQueuedThread(l, t1);
485	>	assertHasSharedQueuedThreads(l, t1);
486	>	Thread t2 = newStartedThread(new CheckedRunnable() {
487	>	public void realRun() throws InterruptedException {
488	>	l.acquireSharedInterruptibly(0);
489	>	}});
490	>	waitForQueuedThread(l, t2);
491	>	assertHasSharedQueuedThreads(l, t1, t2);
492	>	t1.interrupt();
493	>	awaitTermination(t1);
494	>	assertHasSharedQueuedThreads(l, t2);
495	>	assertTrue(l.releaseShared(0));
496	>	awaitTermination(t2);
497	>	assertHasSharedQueuedThreads(l, NO_THREADS);
498	>	}
499	>
500	>	/**
501	>	* tryAcquireNanos is interruptible
502	>	*/
503	>	public void testTryAcquireNanos_Interruptible() {
504	>	final Mutex sync = new Mutex();
505	>	sync.acquire();
506	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
507	>	public void realRun() throws InterruptedException {
508	>	sync.tryAcquireNanos(MILLISECONDS.toNanos(2 * LONG_DELAY_MS));
509	>	}});
510	>
511	>	waitForQueuedThread(sync, t);
512	>	t.interrupt();
513	>	awaitTermination(t);
514	>	}
515	>
516	>	/**
517	>	* tryAcquire on exclusively held sync fails
518	>	*/
519	>	public void testTryAcquireWhenSynced() {
520	>	final Mutex sync = new Mutex();
521	>	sync.acquire();
522	>	Thread t = newStartedThread(new CheckedRunnable() {
523	>	public void realRun() {
524	>	assertFalse(sync.tryAcquire());
525	>	}});
526	>
527	>	awaitTermination(t);
528	>	sync.release();
529	>	}
530	>
531	>	/**
532	>	* tryAcquireNanos on an exclusively held sync times out
533	>	*/
534	>	public void testAcquireNanos_Timeout() {
535	>	final Mutex sync = new Mutex();
536	>	sync.acquire();
537	>	Thread t = newStartedThread(new CheckedRunnable() {
538	>	public void realRun() throws InterruptedException {
539	>	long startTime = System.nanoTime();
540	>	long nanos = MILLISECONDS.toNanos(timeoutMillis());
541	>	assertFalse(sync.tryAcquireNanos(nanos));
542	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
543	>	}});
544	>
545	>	awaitTermination(t);
546	>	sync.release();
547	>	}
548	>
549		/**
550		* getState is true when acquired and false when not
551		*/
552		public void testGetState() {
553	<	final Mutex lock = new Mutex();
554	<	lock.acquireExclusiveUninterruptibly(1);
555	<	assertTrue(lock.isLocked());
556	<	lock.releaseExclusive(1);
557	<	assertFalse(lock.isLocked());
558	<	Thread t = new Thread(new Runnable() {
559	<	public void run() {
560	<	lock.acquireExclusiveUninterruptibly(1);
561	<	try {
562	<	Thread.sleep(SMALL_DELAY_MS);
563	<	}
564	<	catch(Exception e) {
565	<	threadUnexpectedException();
566	<	}
567	<	lock.releaseExclusive(1);
568	<	}
569	<	});
570	<	try {
571	<	t.start();
572	<	Thread.sleep(SHORT_DELAY_MS);
573	<	assertTrue(lock.isLocked());
349	<	t.join();
350	<	assertFalse(lock.isLocked());
351	<	} catch(Exception e){
352	<	unexpectedException();
353	<	}
553	>	final Mutex sync = new Mutex();
554	>	sync.acquire();
555	>	assertTrue(sync.isHeldExclusively());
556	>	sync.release();
557	>	assertFalse(sync.isHeldExclusively());
558	>
559	>	final BooleanLatch acquired = new BooleanLatch();
560	>	final BooleanLatch done = new BooleanLatch();
561	>	Thread t = newStartedThread(new CheckedRunnable() {
562	>	public void realRun() throws InterruptedException {
563	>	sync.acquire();
564	>	assertTrue(acquired.releaseShared(0));
565	>	done.acquireShared(0);
566	>	sync.release();
567	>	}});
568	>
569	>	acquired.acquireShared(0);
570	>	assertTrue(sync.isHeldExclusively());
571	>	assertTrue(done.releaseShared(0));
572	>	awaitTermination(t);
573	>	assertFalse(sync.isHeldExclusively());
574		}
575
576	+	/**
577	+	* acquireInterruptibly succeeds when released, else is interruptible
578	+	*/
579	+	public void testAcquireInterruptibly() throws InterruptedException {
580	+	final Mutex sync = new Mutex();
581	+	final BooleanLatch threadStarted = new BooleanLatch();
582	+	sync.acquireInterruptibly();
583	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
584	+	public void realRun() throws InterruptedException {
585	+	assertTrue(threadStarted.releaseShared(0));
586	+	sync.acquireInterruptibly();
587	+	}});
588	+
589	+	threadStarted.acquireShared(0);
590	+	waitForQueuedThread(sync, t);
591	+	t.interrupt();
592	+	awaitTermination(t);
593	+	assertTrue(sync.isHeldExclusively());
594	+	}
595	+
596	+	/**
597	+	* owns is true for a condition created by sync else false
598	+	*/
599	+	public void testOwns() {
600	+	final Mutex sync = new Mutex();
601	+	final ConditionObject c = sync.newCondition();
602	+	final Mutex sync2 = new Mutex();
603	+	assertTrue(sync.owns(c));
604	+	assertFalse(sync2.owns(c));
605	+	}
606
607		/**
608	<	* acquireExclusiveInterruptibly is interruptible.
609	<	*/
610	<	public void testAcquireInterruptibly1() {
611	<	final Mutex lock = new Mutex();
612	<	lock.acquireExclusiveUninterruptibly(1);
613	<	Thread t = new Thread(new InterruptedLockRunnable(lock));
614	<	try {
615	<	t.start();
616	<	t.interrupt();
617	<	lock.releaseExclusive(1);
618	<	t.join();
619	<	} catch(Exception e){
620	<	unexpectedException();
371	<	}
372	<	}
373	<
374	<	/**
375	<	* acquireExclusiveInterruptibly succeeds when released, else is interruptible
376	<	*/
377	<	public void testAcquireInterruptibly2() {
378	<	final Mutex lock = new Mutex();
379	<	try {
380	<	lock.acquireExclusiveInterruptibly(1);
381	<	} catch(Exception e) {
382	<	unexpectedException();
383	<	}
384	<	Thread t = new Thread(new InterruptedLockRunnable(lock));
385	<	try {
386	<	t.start();
387	<	t.interrupt();
388	<	assertTrue(lock.isLocked());
389	<	t.join();
390	<	} catch(Exception e){
391	<	unexpectedException();
608	>	* Calling await without holding sync throws IllegalMonitorStateException
609	>	*/
610	>	public void testAwait_IMSE() {
611	>	final Mutex sync = new Mutex();
612	>	final ConditionObject c = sync.newCondition();
613	>	for (AwaitMethod awaitMethod : AwaitMethod.values()) {
614	>	long startTime = System.nanoTime();
615	>	try {
616	>	await(c, awaitMethod);
617	>	shouldThrow();
618	>	} catch (IllegalMonitorStateException success) {
619	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
620	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
621		}
622		}
623
624		/**
625	<	* owns is true for a condition created by lock else false
625	>	* Calling signal without holding sync throws IllegalMonitorStateException
626		*/
627	<	public void testOwns() {
628	<	final Mutex lock = new Mutex();
629	<	final AbstractQueuedSynchronizer.ConditionObject c = lock.newCondition();
630	<	final Mutex lock2 = new Mutex();
631	<	assertTrue(lock.owns(c));
632	<	assertFalse(lock2.owns(c));
627	>	public void testSignal_IMSE() {
628	>	final Mutex sync = new Mutex();
629	>	final ConditionObject c = sync.newCondition();
630	>	try {
631	>	c.signal();
632	>	shouldThrow();
633	>	} catch (IllegalMonitorStateException success) {}
634	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
635		}
636
637		/**
638	<	* Calling await without holding lock throws IllegalMonitorStateException
638	>	* Calling signalAll without holding sync throws IllegalMonitorStateException
639		*/
640	<	public void testAwait_IllegalMonitor() {
641	<	final Mutex lock = new Mutex();
642	<	final Condition c = lock.newCondition();
640	>	public void testSignalAll_IMSE() {
641	>	final Mutex sync = new Mutex();
642	>	final ConditionObject c = sync.newCondition();
643		try {
644	<	c.await();
644	>	c.signalAll();
645		shouldThrow();
646	<	}
416	<	catch (IllegalMonitorStateException success) {
417	<	}
418	<	catch (Exception ex) {
419	<	unexpectedException();
420	<	}
646	>	} catch (IllegalMonitorStateException success) {}
647		}
648
649		/**
650	<	* Calling signal without holding lock throws IllegalMonitorStateException
650	>	* await/awaitNanos/awaitUntil without a signal times out
651		*/
652	<	public void testSignal_IllegalMonitor() {
653	<	final Mutex lock = new Mutex();
654	<	final Condition c = lock.newCondition();
652	>	public void testAwaitTimed_Timeout() { testAwait_Timeout(AwaitMethod.awaitTimed); }
653	>	public void testAwaitNanos_Timeout() { testAwait_Timeout(AwaitMethod.awaitNanos); }
654	>	public void testAwaitUntil_Timeout() { testAwait_Timeout(AwaitMethod.awaitUntil); }
655	>	public void testAwait_Timeout(AwaitMethod awaitMethod) {
656	>	final Mutex sync = new Mutex();
657	>	final ConditionObject c = sync.newCondition();
658	>	sync.acquire();
659	>	assertAwaitTimesOut(c, awaitMethod);
660	>	sync.release();
661	>	}
662	>
663	>	/**
664	>	* await/awaitNanos/awaitUntil returns when signalled
665	>	*/
666	>	public void testSignal_await()      { testSignal(AwaitMethod.await); }
667	>	public void testSignal_awaitTimed() { testSignal(AwaitMethod.awaitTimed); }
668	>	public void testSignal_awaitNanos() { testSignal(AwaitMethod.awaitNanos); }
669	>	public void testSignal_awaitUntil() { testSignal(AwaitMethod.awaitUntil); }
670	>	public void testSignal(final AwaitMethod awaitMethod) {
671	>	final Mutex sync = new Mutex();
672	>	final ConditionObject c = sync.newCondition();
673	>	final BooleanLatch acquired = new BooleanLatch();
674	>	Thread t = newStartedThread(new CheckedRunnable() {
675	>	public void realRun() throws InterruptedException {
676	>	sync.acquire();
677	>	assertTrue(acquired.releaseShared(0));
678	>	await(c, awaitMethod);
679	>	sync.release();
680	>	}});
681	>
682	>	acquired.acquireShared(0);
683	>	sync.acquire();
684	>	assertHasWaitersLocked(sync, c, t);
685	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
686	>	c.signal();
687	>	assertHasWaitersLocked(sync, c, NO_THREADS);
688	>	assertHasExclusiveQueuedThreads(sync, t);
689	>	sync.release();
690	>	awaitTermination(t);
691	>	}
692	>
693	>	/**
694	>	* hasWaiters(null) throws NullPointerException
695	>	*/
696	>	public void testHasWaitersNPE() {
697	>	final Mutex sync = new Mutex();
698		try {
699	<	c.signal();
699	>	sync.hasWaiters(null);
700		shouldThrow();
701	<	}
433	<	catch (IllegalMonitorStateException success) {
434	<	}
435	<	catch (Exception ex) {
436	<	unexpectedException();
437	<	}
701	>	} catch (NullPointerException success) {}
702		}
703
704		/**
705	<	* awaitNanos without a signal times out
705	>	* getWaitQueueLength(null) throws NullPointerException
706		*/
707	<	public void testAwaitNanos_Timeout() {
708	<	final Mutex lock = new Mutex();
445	<	final Condition c = lock.newCondition();
707	>	public void testGetWaitQueueLengthNPE() {
708	>	final Mutex sync = new Mutex();
709		try {
710	<	lock.acquireExclusiveUninterruptibly(1);
711	<	long t = c.awaitNanos(100);
712	<	assertTrue(t <= 0);
450	<	lock.releaseExclusive(1);
451	<	}
452	<	catch (Exception ex) {
453	<	unexpectedException();
454	<	}
710	>	sync.getWaitQueueLength(null);
711	>	shouldThrow();
712	>	} catch (NullPointerException success) {}
713		}
714
715		/**
716	<	*  timed await without a signal times out
716	>	* getWaitingThreads(null) throws NullPointerException
717		*/
718	<	public void testAwait_Timeout() {
719	<	final Mutex lock = new Mutex();
462	<	final Condition c = lock.newCondition();
718	>	public void testGetWaitingThreadsNPE() {
719	>	final Mutex sync = new Mutex();
720		try {
721	<	lock.acquireExclusiveUninterruptibly(1);
722	<	assertFalse(c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
723	<	lock.releaseExclusive(1);
467	<	}
468	<	catch (Exception ex) {
469	<	unexpectedException();
470	<	}
721	>	sync.getWaitingThreads(null);
722	>	shouldThrow();
723	>	} catch (NullPointerException success) {}
724		}
725
726		/**
727	<	* awaitUntil without a signal times out
727	>	* hasWaiters throws IllegalArgumentException if not owned
728		*/
729	<	public void testAwaitUntil_Timeout() {
730	<	final Mutex lock = new Mutex();
731	<	final Condition c = lock.newCondition();
729	>	public void testHasWaitersIAE() {
730	>	final Mutex sync = new Mutex();
731	>	final ConditionObject c = sync.newCondition();
732	>	final Mutex sync2 = new Mutex();
733		try {
734	<	lock.acquireExclusiveUninterruptibly(1);
735	<	java.util.Date d = new java.util.Date();
736	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
737	<	lock.releaseExclusive(1);
738	<	}
739	<	catch (Exception ex) {
740	<	unexpectedException();
741	<	}
734	>	sync2.hasWaiters(c);
735	>	shouldThrow();
736	>	} catch (IllegalArgumentException success) {}
737	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
738	>	}
739	>
740	>	/**
741	>	* hasWaiters throws IllegalMonitorStateException if not synced
742	>	*/
743	>	public void testHasWaitersIMSE() {
744	>	final Mutex sync = new Mutex();
745	>	final ConditionObject c = sync.newCondition();
746	>	try {
747	>	sync.hasWaiters(c);
748	>	shouldThrow();
749	>	} catch (IllegalMonitorStateException success) {}
750	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
751		}
752
753		/**
754	<	* await returns when signalled
754	>	* getWaitQueueLength throws IllegalArgumentException if not owned
755		*/
756	<	public void testAwait() {
757	<	final Mutex lock = new Mutex();
758	<	final Condition c = lock.newCondition();
759	<	Thread t = new Thread(new Runnable() {
760	<	public void run() {
761	<	try {
762	<	lock.acquireExclusiveUninterruptibly(1);
763	<	c.await();
764	<	lock.releaseExclusive(1);
765	<	}
503	<	catch(InterruptedException e) {
504	<	threadUnexpectedException();
505	<	}
506	<	}
507	<	});
756	>	public void testGetWaitQueueLengthIAE() {
757	>	final Mutex sync = new Mutex();
758	>	final ConditionObject c = sync.newCondition();
759	>	final Mutex sync2 = new Mutex();
760	>	try {
761	>	sync2.getWaitQueueLength(c);
762	>	shouldThrow();
763	>	} catch (IllegalArgumentException success) {}
764	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
765	>	}
766
767	+	/**
768	+	* getWaitQueueLength throws IllegalMonitorStateException if not synced
769	+	*/
770	+	public void testGetWaitQueueLengthIMSE() {
771	+	final Mutex sync = new Mutex();
772	+	final ConditionObject c = sync.newCondition();
773		try {
774	<	t.start();
775	<	Thread.sleep(SHORT_DELAY_MS);
776	<	lock.acquireExclusiveUninterruptibly(1);
777	<	c.signal();
514	<	lock.releaseExclusive(1);
515	<	t.join(SHORT_DELAY_MS);
516	<	assertFalse(t.isAlive());
517	<	}
518	<	catch (Exception ex) {
519	<	unexpectedException();
520	<	}
774	>	sync.getWaitQueueLength(c);
775	>	shouldThrow();
776	>	} catch (IllegalMonitorStateException success) {}
777	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
778		}
779
780	+	/**
781	+	* getWaitingThreads throws IllegalArgumentException if not owned
782	+	*/
783	+	public void testGetWaitingThreadsIAE() {
784	+	final Mutex sync = new Mutex();
785	+	final ConditionObject c = sync.newCondition();
786	+	final Mutex sync2 = new Mutex();
787	+	try {
788	+	sync2.getWaitingThreads(c);
789	+	shouldThrow();
790	+	} catch (IllegalArgumentException success) {}
791	+	assertHasWaitersUnlocked(sync, c, NO_THREADS);
792	+	}
793	+
794	+	/**
795	+	* getWaitingThreads throws IllegalMonitorStateException if not synced
796	+	*/
797	+	public void testGetWaitingThreadsIMSE() {
798	+	final Mutex sync = new Mutex();
799	+	final ConditionObject c = sync.newCondition();
800	+	try {
801	+	sync.getWaitingThreads(c);
802	+	shouldThrow();
803	+	} catch (IllegalMonitorStateException success) {}
804	+	assertHasWaitersUnlocked(sync, c, NO_THREADS);
805	+	}
806
807		/**
808	<	* Latch isSignalled initially returns false, then true after release
808	>	* hasWaiters returns true when a thread is waiting, else false
809		*/
810	<	public void testLatchIsSignalled() {
811	<	final BooleanLatch l = new BooleanLatch();
812	<	assertFalse(l.isSignalled());
813	<	l.releaseShared(0);
814	<	assertTrue(l.isSignalled());
810	>	public void testHasWaiters() {
811	>	final Mutex sync = new Mutex();
812	>	final ConditionObject c = sync.newCondition();
813	>	final BooleanLatch acquired = new BooleanLatch();
814	>	Thread t = newStartedThread(new CheckedRunnable() {
815	>	public void realRun() throws InterruptedException {
816	>	sync.acquire();
817	>	assertHasWaitersLocked(sync, c, NO_THREADS);
818	>	assertFalse(sync.hasWaiters(c));
819	>	assertTrue(acquired.releaseShared(0));
820	>	c.await();
821	>	sync.release();
822	>	}});
823	>
824	>	acquired.acquireShared(0);
825	>	sync.acquire();
826	>	assertHasWaitersLocked(sync, c, t);
827	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
828	>	assertTrue(sync.hasWaiters(c));
829	>	c.signal();
830	>	assertHasWaitersLocked(sync, c, NO_THREADS);
831	>	assertHasExclusiveQueuedThreads(sync, t);
832	>	assertFalse(sync.hasWaiters(c));
833	>	sync.release();
834	>
835	>	awaitTermination(t);
836	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
837	>	}
838	>
839	>	/**
840	>	* getWaitQueueLength returns number of waiting threads
841	>	*/
842	>	public void testGetWaitQueueLength() {
843	>	final Mutex sync = new Mutex();
844	>	final ConditionObject c = sync.newCondition();
845	>	final BooleanLatch acquired1 = new BooleanLatch();
846	>	final BooleanLatch acquired2 = new BooleanLatch();
847	>	final Thread t1 = newStartedThread(new CheckedRunnable() {
848	>	public void realRun() throws InterruptedException {
849	>	sync.acquire();
850	>	assertHasWaitersLocked(sync, c, NO_THREADS);
851	>	assertEquals(0, sync.getWaitQueueLength(c));
852	>	assertTrue(acquired1.releaseShared(0));
853	>	c.await();
854	>	sync.release();
855	>	}});
856	>	acquired1.acquireShared(0);
857	>	sync.acquire();
858	>	assertHasWaitersLocked(sync, c, t1);
859	>	assertEquals(1, sync.getWaitQueueLength(c));
860	>	sync.release();
861	>
862	>	final Thread t2 = newStartedThread(new CheckedRunnable() {
863	>	public void realRun() throws InterruptedException {
864	>	sync.acquire();
865	>	assertHasWaitersLocked(sync, c, t1);
866	>	assertEquals(1, sync.getWaitQueueLength(c));
867	>	assertTrue(acquired2.releaseShared(0));
868	>	c.await();
869	>	sync.release();
870	>	}});
871	>	acquired2.acquireShared(0);
872	>	sync.acquire();
873	>	assertHasWaitersLocked(sync, c, t1, t2);
874	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
875	>	assertEquals(2, sync.getWaitQueueLength(c));
876	>	c.signalAll();
877	>	assertHasWaitersLocked(sync, c, NO_THREADS);
878	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
879	>	assertEquals(0, sync.getWaitQueueLength(c));
880	>	sync.release();
881	>
882	>	awaitTermination(t1);
883	>	awaitTermination(t2);
884	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
885	>	}
886	>
887	>	/**
888	>	* getWaitingThreads returns only and all waiting threads
889	>	*/
890	>	public void testGetWaitingThreads() {
891	>	final Mutex sync = new Mutex();
892	>	final ConditionObject c = sync.newCondition();
893	>	final BooleanLatch acquired1 = new BooleanLatch();
894	>	final BooleanLatch acquired2 = new BooleanLatch();
895	>	final Thread t1 = new Thread(new CheckedRunnable() {
896	>	public void realRun() throws InterruptedException {
897	>	sync.acquire();
898	>	assertHasWaitersLocked(sync, c, NO_THREADS);
899	>	assertTrue(sync.getWaitingThreads(c).isEmpty());
900	>	assertTrue(acquired1.releaseShared(0));
901	>	c.await();
902	>	sync.release();
903	>	}});
904	>
905	>	final Thread t2 = new Thread(new CheckedRunnable() {
906	>	public void realRun() throws InterruptedException {
907	>	sync.acquire();
908	>	assertHasWaitersLocked(sync, c, t1);
909	>	assertTrue(sync.getWaitingThreads(c).contains(t1));
910	>	assertFalse(sync.getWaitingThreads(c).isEmpty());
911	>	assertEquals(1, sync.getWaitingThreads(c).size());
912	>	assertTrue(acquired2.releaseShared(0));
913	>	c.await();
914	>	sync.release();
915	>	}});
916	>
917	>	sync.acquire();
918	>	assertHasWaitersLocked(sync, c, NO_THREADS);
919	>	assertFalse(sync.getWaitingThreads(c).contains(t1));
920	>	assertFalse(sync.getWaitingThreads(c).contains(t2));
921	>	assertTrue(sync.getWaitingThreads(c).isEmpty());
922	>	assertEquals(0, sync.getWaitingThreads(c).size());
923	>	sync.release();
924	>
925	>	t1.start();
926	>	acquired1.acquireShared(0);
927	>	sync.acquire();
928	>	assertHasWaitersLocked(sync, c, t1);
929	>	assertTrue(sync.getWaitingThreads(c).contains(t1));
930	>	assertFalse(sync.getWaitingThreads(c).contains(t2));
931	>	assertFalse(sync.getWaitingThreads(c).isEmpty());
932	>	assertEquals(1, sync.getWaitingThreads(c).size());
933	>	sync.release();
934	>
935	>	t2.start();
936	>	acquired2.acquireShared(0);
937	>	sync.acquire();
938	>	assertHasWaitersLocked(sync, c, t1, t2);
939	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
940	>	assertTrue(sync.getWaitingThreads(c).contains(t1));
941	>	assertTrue(sync.getWaitingThreads(c).contains(t2));
942	>	assertFalse(sync.getWaitingThreads(c).isEmpty());
943	>	assertEquals(2, sync.getWaitingThreads(c).size());
944	>	c.signalAll();
945	>	assertHasWaitersLocked(sync, c, NO_THREADS);
946	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
947	>	assertFalse(sync.getWaitingThreads(c).contains(t1));
948	>	assertFalse(sync.getWaitingThreads(c).contains(t2));
949	>	assertTrue(sync.getWaitingThreads(c).isEmpty());
950	>	assertEquals(0, sync.getWaitingThreads(c).size());
951	>	sync.release();
952	>
953	>	awaitTermination(t1);
954	>	awaitTermination(t2);
955	>	assertHasWaitersUnlocked(sync, c, NO_THREADS);
956	>	}
957	>
958	>	/**
959	>	* awaitUninterruptibly is uninterruptible
960	>	*/
961	>	public void testAwaitUninterruptibly() {
962	>	final Mutex sync = new Mutex();
963	>	final ConditionObject c = sync.newCondition();
964	>	final BooleanLatch pleaseInterrupt = new BooleanLatch();
965	>	Thread t = newStartedThread(new CheckedRunnable() {
966	>	public void realRun() {
967	>	sync.acquire();
968	>	assertTrue(pleaseInterrupt.releaseShared(0));
969	>	c.awaitUninterruptibly();
970	>	assertTrue(Thread.interrupted());
971	>	assertHasWaitersLocked(sync, c, NO_THREADS);
972	>	sync.release();
973	>	}});
974	>
975	>	pleaseInterrupt.acquireShared(0);
976	>	sync.acquire();
977	>	assertHasWaitersLocked(sync, c, t);
978	>	sync.release();
979	>	t.interrupt();
980	>	assertHasWaitersUnlocked(sync, c, t);
981	>	assertThreadStaysAlive(t);
982	>	sync.acquire();
983	>	assertHasWaitersLocked(sync, c, t);
984	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
985	>	c.signal();
986	>	assertHasWaitersLocked(sync, c, NO_THREADS);
987	>	assertHasExclusiveQueuedThreads(sync, t);
988	>	sync.release();
989	>	awaitTermination(t);
990	>	}
991	>
992	>	/**
993	>	* await/awaitNanos/awaitUntil is interruptible
994	>	*/
995	>	public void testInterruptible_await()      { testInterruptible(AwaitMethod.await); }
996	>	public void testInterruptible_awaitTimed() { testInterruptible(AwaitMethod.awaitTimed); }
997	>	public void testInterruptible_awaitNanos() { testInterruptible(AwaitMethod.awaitNanos); }
998	>	public void testInterruptible_awaitUntil() { testInterruptible(AwaitMethod.awaitUntil); }
999	>	public void testInterruptible(final AwaitMethod awaitMethod) {
1000	>	final Mutex sync = new Mutex();
1001	>	final ConditionObject c = sync.newCondition();
1002	>	final BooleanLatch pleaseInterrupt = new BooleanLatch();
1003	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1004	>	public void realRun() throws InterruptedException {
1005	>	sync.acquire();
1006	>	assertTrue(pleaseInterrupt.releaseShared(0));
1007	>	await(c, awaitMethod);
1008	>	}});
1009	>
1010	>	pleaseInterrupt.acquireShared(0);
1011	>	t.interrupt();
1012	>	awaitTermination(t);
1013	>	}
1014	>
1015	>	/**
1016	>	* signalAll wakes up all threads
1017	>	*/
1018	>	public void testSignalAll_await()      { testSignalAll(AwaitMethod.await); }
1019	>	public void testSignalAll_awaitTimed() { testSignalAll(AwaitMethod.awaitTimed); }
1020	>	public void testSignalAll_awaitNanos() { testSignalAll(AwaitMethod.awaitNanos); }
1021	>	public void testSignalAll_awaitUntil() { testSignalAll(AwaitMethod.awaitUntil); }
1022	>	public void testSignalAll(final AwaitMethod awaitMethod) {
1023	>	final Mutex sync = new Mutex();
1024	>	final ConditionObject c = sync.newCondition();
1025	>	final BooleanLatch acquired1 = new BooleanLatch();
1026	>	final BooleanLatch acquired2 = new BooleanLatch();
1027	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1028	>	public void realRun() throws InterruptedException {
1029	>	sync.acquire();
1030	>	acquired1.releaseShared(0);
1031	>	await(c, awaitMethod);
1032	>	sync.release();
1033	>	}});
1034	>
1035	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1036	>	public void realRun() throws InterruptedException {
1037	>	sync.acquire();
1038	>	acquired2.releaseShared(0);
1039	>	await(c, awaitMethod);
1040	>	sync.release();
1041	>	}});
1042	>
1043	>	acquired1.acquireShared(0);
1044	>	acquired2.acquireShared(0);
1045	>	sync.acquire();
1046	>	assertHasWaitersLocked(sync, c, t1, t2);
1047	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
1048	>	c.signalAll();
1049	>	assertHasWaitersLocked(sync, c, NO_THREADS);
1050	>	assertHasExclusiveQueuedThreads(sync, t1, t2);
1051	>	sync.release();
1052	>	awaitTermination(t1);
1053	>	awaitTermination(t2);
1054	>	}
1055	>
1056	>	/**
1057	>	* toString indicates current state
1058	>	*/
1059	>	public void testToString() {
1060	>	Mutex sync = new Mutex();
1061	>	assertTrue(sync.toString().contains("State = " + Mutex.UNLOCKED));
1062	>	sync.acquire();
1063	>	assertTrue(sync.toString().contains("State = " + Mutex.LOCKED));
1064	>	}
1065	>
1066	>	/**
1067	>	* A serialized AQS deserializes with current state, but no queued threads
1068	>	*/
1069	>	public void testSerialization() {
1070	>	Mutex sync = new Mutex();
1071	>	assertFalse(serialClone(sync).isHeldExclusively());
1072	>	sync.acquire();
1073	>	Thread t = newStartedThread(new InterruptedSyncRunnable(sync));
1074	>	waitForQueuedThread(sync, t);
1075	>	assertTrue(sync.isHeldExclusively());
1076	>
1077	>	Mutex clone = serialClone(sync);
1078	>	assertTrue(clone.isHeldExclusively());
1079	>	assertHasExclusiveQueuedThreads(sync, t);
1080	>	assertHasExclusiveQueuedThreads(clone, NO_THREADS);
1081	>	t.interrupt();
1082	>	awaitTermination(t);
1083	>	sync.release();
1084	>	assertFalse(sync.isHeldExclusively());
1085	>	assertTrue(clone.isHeldExclusively());
1086	>	assertHasExclusiveQueuedThreads(sync, NO_THREADS);
1087	>	assertHasExclusiveQueuedThreads(clone, NO_THREADS);
1088		}
1089
1090		/**
1091	<	* release and has no effect when already signalled
1091	>	* tryReleaseShared setting state changes getState
1092	>	*/
1093	>	public void testGetStateWithReleaseShared() {
1094	>	final BooleanLatch l = new BooleanLatch();
1095	>	assertFalse(l.isSignalled());
1096	>	assertTrue(l.releaseShared(0));
1097	>	assertTrue(l.isSignalled());
1098	>	}
1099	>
1100	>	/**
1101	>	* releaseShared has no effect when already signalled
1102		*/
1103		public void testReleaseShared() {
1104	<	final BooleanLatch l = new BooleanLatch();
1105	<	assertFalse(l.isSignalled());
1106	<	l.releaseShared(0);
1107	<	assertTrue(l.isSignalled());
1108	<	l.releaseShared(0);
1109	<	assertTrue(l.isSignalled());
1104	>	final BooleanLatch l = new BooleanLatch();
1105	>	assertFalse(l.isSignalled());
1106	>	assertTrue(l.releaseShared(0));
1107	>	assertTrue(l.isSignalled());
1108	>	assertTrue(l.releaseShared(0));
1109	>	assertTrue(l.isSignalled());
1110		}
1111
1112		/**
1113		* acquireSharedInterruptibly returns after release, but not before
1114		*/
1115		public void testAcquireSharedInterruptibly() {
1116	<	final BooleanLatch l = new BooleanLatch();
1116	>	final BooleanLatch l = new BooleanLatch();
1117
1118	<	Thread t = new Thread(new Runnable() {
1119	<	public void run() {
1120	<	try {
1121	<	threadAssertFalse(l.isSignalled());
1122	<	l.acquireSharedInterruptibly(0);
1123	<	threadAssertTrue(l.isSignalled());
1124	<	} catch(InterruptedException e){
1125	<	threadUnexpectedException();
1126	<	}
1127	<	}
1128	<	});
1129	<	try {
1130	<	t.start();
1131	<	assertFalse(l.isSignalled());
1132	<	Thread.sleep(SHORT_DELAY_MS);
1133	<	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	<	}
1118	>	Thread t = newStartedThread(new CheckedRunnable() {
1119	>	public void realRun() throws InterruptedException {
1120	>	assertFalse(l.isSignalled());
1121	>	l.acquireSharedInterruptibly(0);
1122	>	assertTrue(l.isSignalled());
1123	>	l.acquireSharedInterruptibly(0);
1124	>	assertTrue(l.isSignalled());
1125	>	}});
1126	>
1127	>	waitForQueuedThread(l, t);
1128	>	assertFalse(l.isSignalled());
1129	>	assertThreadStaysAlive(t);
1130	>	assertHasSharedQueuedThreads(l, t);
1131	>	assertTrue(l.releaseShared(0));
1132	>	assertTrue(l.isSignalled());
1133	>	awaitTermination(t);
1134		}
1135	<
1135	>
1136		/**
1137	<	* acquireSharedInterruptibly throws IE if interrupted before released
1137	>	* tryAcquireSharedNanos returns after release, but not before
1138		*/
1139	<	public void testAcquireSharedInterruptibly_InterruptedException() {
1139	>	public void testTryAcquireSharedNanos() {
1140		final BooleanLatch l = new BooleanLatch();
1141	<	Thread t = new Thread(new Runnable() {
1142	<	public void run() {
1143	<	try {
1144	<	threadAssertFalse(l.isSignalled());
1145	<	l.acquireSharedInterruptibly(0);
1146	<	threadShouldThrow();
1147	<	} catch(InterruptedException success){}
1148	<	}
1149	<	});
1150	<	t.start();
1151	<	try {
1152	<	assertFalse(l.isSignalled());
1153	<	t.interrupt();
1154	<	t.join();
1155	<	} catch (InterruptedException e){
1156	<	unexpectedException();
1157	<	}
1141	>
1142	>	Thread t = newStartedThread(new CheckedRunnable() {
1143	>	public void realRun() throws InterruptedException {
1144	>	assertFalse(l.isSignalled());
1145	>	long nanos = MILLISECONDS.toNanos(2 * LONG_DELAY_MS);
1146	>	assertTrue(l.tryAcquireSharedNanos(0, nanos));
1147	>	assertTrue(l.isSignalled());
1148	>	assertTrue(l.tryAcquireSharedNanos(0, nanos));
1149	>	assertTrue(l.isSignalled());
1150	>	}});
1151	>
1152	>	waitForQueuedThread(l, t);
1153	>	assertFalse(l.isSignalled());
1154	>	assertThreadStaysAlive(t);
1155	>	assertTrue(l.releaseShared(0));
1156	>	assertTrue(l.isSignalled());
1157	>	awaitTermination(t);
1158		}
1159
1160		/**
1161	<	* acquireSharedTimed throws IE if interrupted before released
1161	>	* acquireSharedInterruptibly is interruptible
1162		*/
1163	<	public void testAcquireSharedNanos_InterruptedException() {
1163	>	public void testAcquireSharedInterruptibly_Interruptible() {
1164		final BooleanLatch l = new BooleanLatch();
1165	<	Thread t = new Thread(new Runnable() {
1166	<	public void run() {
1167	<	try {
1168	<	threadAssertFalse(l.isSignalled());
1169	<	l.acquireSharedNanos(0, SMALL_DELAY_MS* 1000 * 1000);
1170	<	threadShouldThrow();
1171	<	} catch(InterruptedException success){}
1172	<	}
1173	<	});
1174	<	t.start();
1175	<	try {
646	<	Thread.sleep(SHORT_DELAY_MS);
647	<	assertFalse(l.isSignalled());
648	<	t.interrupt();
649	<	t.join();
650	<	} catch (InterruptedException e){
651	<	unexpectedException();
652	<	}
1165	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1166	>	public void realRun() throws InterruptedException {
1167	>	assertFalse(l.isSignalled());
1168	>	l.acquireSharedInterruptibly(0);
1169	>	}});
1170	>
1171	>	waitForQueuedThread(l, t);
1172	>	assertFalse(l.isSignalled());
1173	>	t.interrupt();
1174	>	awaitTermination(t);
1175	>	assertFalse(l.isSignalled());
1176		}
1177
1178		/**
1179	<	* acquireSharedTimed times out if not released before timeout
1179	>	* tryAcquireSharedNanos is interruptible
1180		*/
1181	<	public void testAcquireSharedNanos_Timeout() {
1181	>	public void testTryAcquireSharedNanos_Interruptible() {
1182		final BooleanLatch l = new BooleanLatch();
1183	<	Thread t = new Thread(new Runnable() {
1184	<	public void run() {
1185	<	try {
1186	<	threadAssertFalse(l.isSignalled());
1187	<	threadAssertFalse(l.acquireSharedNanos(0, SMALL_DELAY_MS* 1000 * 1000));
1188	<	} catch(InterruptedException ie){
1189	<	threadUnexpectedException();
1190	<	}
1183	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1184	>	public void realRun() throws InterruptedException {
1185	>	assertFalse(l.isSignalled());
1186	>	long nanos = MILLISECONDS.toNanos(2 * LONG_DELAY_MS);
1187	>	l.tryAcquireSharedNanos(0, nanos);
1188	>	}});
1189	>
1190	>	waitForQueuedThread(l, t);
1191	>	assertFalse(l.isSignalled());
1192	>	t.interrupt();
1193	>	awaitTermination(t);
1194	>	assertFalse(l.isSignalled());
1195	>	}
1196	>
1197	>	/**
1198	>	* tryAcquireSharedNanos times out if not released before timeout
1199	>	*/
1200	>	public void testTryAcquireSharedNanos_Timeout() {
1201	>	final BooleanLatch l = new BooleanLatch();
1202	>	final BooleanLatch observedQueued = new BooleanLatch();
1203	>	final long timeoutMillis = timeoutMillis();
1204	>	Thread t = newStartedThread(new CheckedRunnable() {
1205	>	public void realRun() throws InterruptedException {
1206	>	assertFalse(l.isSignalled());
1207	>	for (long millis = timeoutMillis();
1208	>	!observedQueued.isSignalled();
1209	>	millis *= 2) {
1210	>	long nanos = MILLISECONDS.toNanos(millis);
1211	>	long startTime = System.nanoTime();
1212	>	assertFalse(l.tryAcquireSharedNanos(0, nanos));
1213	>	assertTrue(millisElapsedSince(startTime) >= millis);
1214		}
1215	<	});
1216	<	t.start();
1217	<	try {
1218	<	Thread.sleep(SHORT_DELAY_MS);
1219	<	assertFalse(l.isSignalled());
1220	<	t.join();
1221	<	} catch (InterruptedException e){
1222	<	unexpectedException();
1223	<	}
1215	>	assertFalse(l.isSignalled());
1216	>	}});
1217	>
1218	>	waitForQueuedThread(l, t);
1219	>	observedQueued.releaseShared(0);
1220	>	assertFalse(l.isSignalled());
1221	>	awaitTermination(t);
1222	>	assertFalse(l.isSignalled());
1223	>	}
1224	>
1225	>	/**
1226	>	* awaitNanos/timed await with 0 wait times out immediately
1227	>	*/
1228	>	public void testAwait_Zero() throws InterruptedException {
1229	>	final Mutex sync = new Mutex();
1230	>	final ConditionObject c = sync.newCondition();
1231	>	sync.acquire();
1232	>	assertTrue(c.awaitNanos(0L) <= 0);
1233	>	assertFalse(c.await(0L, NANOSECONDS));
1234	>	sync.release();
1235		}
1236	<
1236	>
1237	>	/**
1238	>	* awaitNanos/timed await with maximum negative wait times does not underflow
1239	>	*/
1240	>	public void testAwait_NegativeInfinity() throws InterruptedException {
1241	>	final Mutex sync = new Mutex();
1242	>	final ConditionObject c = sync.newCondition();
1243	>	sync.acquire();
1244	>	assertTrue(c.awaitNanos(Long.MIN_VALUE) <= 0);
1245	>	assertFalse(c.await(Long.MIN_VALUE, NANOSECONDS));
1246	>	sync.release();
1247	>	}
1248	>
1249		}

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