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root/jsr166/jsr166/src/test/tck/ReentrantLockTest.java

Comparing jsr166/src/test/tck/ReentrantLockTest.java (file contents):
Revision 1.12 by dl, Sat Dec 27 19:26:43 2003 UTC vs.
Revision 1.43 by jsr166, Sat May 7 03:36:23 2011 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 junit.framework.*;
10		import java.util.concurrent.locks.*;
11		import java.util.concurrent.*;
12	+	import static java.util.concurrent.TimeUnit.MILLISECONDS;
13		import java.util.*;
14		import java.io.*;
15
16		public class ReentrantLockTest extends JSR166TestCase {
17		public static void main(String[] args) {
18	<	junit.textui.TestRunner.run (suite());
18	>	junit.textui.TestRunner.run(suite());
19		}
20		public static Test suite() {
21	<	return new TestSuite(ReentrantLockTest.class);
21	>	return new TestSuite(ReentrantLockTest.class);
22		}
23
24		/**
25		* A runnable calling lockInterruptibly
26		*/
27	<	class InterruptibleLockRunnable implements Runnable {
27	>	class InterruptibleLockRunnable extends CheckedRunnable {
28		final ReentrantLock lock;
29		InterruptibleLockRunnable(ReentrantLock l) { lock = l; }
30	<	public void run() {
31	<	try {
31	<	lock.lockInterruptibly();
32	<	} catch(InterruptedException success){}
30	>	public void realRun() throws InterruptedException {
31	>	lock.lockInterruptibly();
32		}
33		}
34
#	Line 38 | Line 37 | public class ReentrantLockTest extends J
37		* A runnable calling lockInterruptibly that expects to be
38		* interrupted
39		*/
40	<	class InterruptedLockRunnable implements Runnable {
40	>	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
41		final ReentrantLock lock;
42		InterruptedLockRunnable(ReentrantLock l) { lock = l; }
43	<	public void run() {
44	<	try {
46	<	lock.lockInterruptibly();
47	<	threadShouldThrow();
48	<	} catch(InterruptedException success){}
43	>	public void realRun() throws InterruptedException {
44	>	lock.lockInterruptibly();
45		}
46		}
47
#	Line 54 | Line 50 | public class ReentrantLockTest extends J
50		*/
51		static class PublicReentrantLock extends ReentrantLock {
52		PublicReentrantLock() { super(); }
53	<	public Collection<Thread> getQueuedThreads() {
54	<	return super.getQueuedThreads();
53	>	public Collection<Thread> getQueuedThreads() {
54	>	return super.getQueuedThreads();
55		}
56	+	public Collection<Thread> getWaitingThreads(Condition c) {
57	+	return super.getWaitingThreads(c);
58	+	}
59	+	}
60	+
61	+	/**
62	+	* Checks that condition c has no waiters.
63	+	*/
64	+	void assertHasNoWaiters(PublicReentrantLock lock, Condition c) {
65	+	assertHasWaiters(lock, c, new Thread[] {});
66	+	}
67
68	+	/**
69	+	* Checks that condition c has exactly the given waiter threads.
70	+	*/
71	+	void assertHasWaiters(PublicReentrantLock lock, Condition c,
72	+	Thread... threads) {
73	+	lock.lock();
74	+	assertEquals(threads.length > 0, lock.hasWaiters(c));
75	+	assertEquals(threads.length, lock.getWaitQueueLength(c));
76	+	assertEquals(threads.length == 0, lock.getWaitingThreads(c).isEmpty());
77	+	assertEquals(threads.length, lock.getWaitingThreads(c).size());
78	+	assertEquals(new HashSet<Thread>(lock.getWaitingThreads(c)),
79	+	new HashSet<Thread>(Arrays.asList(threads)));
80	+	lock.unlock();
81		}
82
83		/**
84		* Constructor sets given fairness
85		*/
86	<	public void testConstructor() {
87	<	ReentrantLock rl = new ReentrantLock();
88	<	assertFalse(rl.isFair());
89	<	ReentrantLock r2 = new ReentrantLock(true);
70	<	assertTrue(r2.isFair());
86	>	public void testConstructor() {
87	>	assertFalse(new ReentrantLock().isFair());
88	>	assertFalse(new ReentrantLock(false).isFair());
89	>	assertTrue(new ReentrantLock(true).isFair());
90		}
91
92		/**
93		* locking an unlocked lock succeeds
94		*/
95	<	public void testLock() {
96	<	ReentrantLock rl = new ReentrantLock();
95	>	public void testLock() {
96	>	ReentrantLock rl = new ReentrantLock();
97		rl.lock();
98		assertTrue(rl.isLocked());
99		rl.unlock();
100	+	assertFalse(rl.isLocked());
101		}
102
103		/**
104		* locking an unlocked fair lock succeeds
105		*/
106	<	public void testFairLock() {
107	<	ReentrantLock rl = new ReentrantLock(true);
106	>	public void testFairLock() {
107	>	ReentrantLock rl = new ReentrantLock(true);
108		rl.lock();
109		assertTrue(rl.isLocked());
110		rl.unlock();
#	Line 93 | Line 113 | public class ReentrantLockTest extends J
113		/**
114		* Unlocking an unlocked lock throws IllegalMonitorStateException
115		*/
116	<	public void testUnlock_IllegalMonitorStateException() {
117	<	ReentrantLock rl = new ReentrantLock();
118	<	try {
119	<	rl.unlock();
120	<	shouldThrow();
121	<
102	<	} catch(IllegalMonitorStateException success){}
116	>	public void testUnlock_IllegalMonitorStateException() {
117	>	ReentrantLock rl = new ReentrantLock();
118	>	try {
119	>	rl.unlock();
120	>	shouldThrow();
121	>	} catch (IllegalMonitorStateException success) {}
122		}
123
124		/**
125	<	* trylock on an unlocked lock succeeds
125	>	* tryLock on an unlocked lock succeeds
126		*/
127	<	public void testTryLock() {
128	<	ReentrantLock rl = new ReentrantLock();
127	>	public void testTryLock() {
128	>	ReentrantLock rl = new ReentrantLock();
129		assertTrue(rl.tryLock());
130		assertTrue(rl.isLocked());
131		rl.unlock();
#	Line 114 | Line 133 | public class ReentrantLockTest extends J
133
134
135		/**
136	+	* hasQueuedThreads reports whether there are waiting threads
137	+	*/
138	+	public void testhasQueuedThreads() throws InterruptedException {
139	+	final ReentrantLock lock = new ReentrantLock();
140	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
141	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
142	+	assertFalse(lock.hasQueuedThreads());
143	+	lock.lock();
144	+	t1.start();
145	+	delay(SHORT_DELAY_MS);
146	+	assertTrue(lock.hasQueuedThreads());
147	+	t2.start();
148	+	delay(SHORT_DELAY_MS);
149	+	assertTrue(lock.hasQueuedThreads());
150	+	t1.interrupt();
151	+	delay(SHORT_DELAY_MS);
152	+	assertTrue(lock.hasQueuedThreads());
153	+	lock.unlock();
154	+	delay(SHORT_DELAY_MS);
155	+	assertFalse(lock.hasQueuedThreads());
156	+	awaitTermination(t1);
157	+	awaitTermination(t2);
158	+	}
159	+
160	+	/**
161		* getQueueLength reports number of waiting threads
162		*/
163	<	public void testGetQueueLength() {
164	<	final ReentrantLock lock = new ReentrantLock();
163	>	public void testGetQueueLength() throws InterruptedException {
164	>	final ReentrantLock lock = new ReentrantLock();
165		Thread t1 = new Thread(new InterruptedLockRunnable(lock));
166		Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
167	+	assertEquals(0, lock.getQueueLength());
168	+	lock.lock();
169	+	t1.start();
170	+	delay(SHORT_DELAY_MS);
171	+	assertEquals(1, lock.getQueueLength());
172	+	t2.start();
173	+	delay(SHORT_DELAY_MS);
174	+	assertEquals(2, lock.getQueueLength());
175	+	t1.interrupt();
176	+	delay(SHORT_DELAY_MS);
177	+	assertEquals(1, lock.getQueueLength());
178	+	lock.unlock();
179	+	delay(SHORT_DELAY_MS);
180	+	assertEquals(0, lock.getQueueLength());
181	+	awaitTermination(t1);
182	+	awaitTermination(t2);
183	+	}
184	+
185	+	/**
186	+	* getQueueLength reports number of waiting threads
187	+	*/
188	+	public void testGetQueueLength_fair() throws InterruptedException {
189	+	final ReentrantLock lock = new ReentrantLock(true);
190	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
191	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
192	+	assertEquals(0, lock.getQueueLength());
193	+	lock.lock();
194	+	t1.start();
195	+	delay(SHORT_DELAY_MS);
196	+	assertEquals(1, lock.getQueueLength());
197	+	t2.start();
198	+	delay(SHORT_DELAY_MS);
199	+	assertEquals(2, lock.getQueueLength());
200	+	t1.interrupt();
201	+	delay(SHORT_DELAY_MS);
202	+	assertEquals(1, lock.getQueueLength());
203	+	lock.unlock();
204	+	delay(SHORT_DELAY_MS);
205	+	assertEquals(0, lock.getQueueLength());
206	+	awaitTermination(t1);
207	+	awaitTermination(t2);
208	+	}
209	+
210	+	/**
211	+	* hasQueuedThread(null) throws NPE
212	+	*/
213	+	public void testHasQueuedThreadNPE() {
214	+	final ReentrantLock sync = new ReentrantLock();
215		try {
216	<	assertEquals(0, lock.getQueueLength());
217	<	lock.lock();
218	<	t1.start();
219	<	Thread.sleep(SHORT_DELAY_MS);
220	<	assertEquals(1, lock.getQueueLength());
221	<	t2.start();
222	<	Thread.sleep(SHORT_DELAY_MS);
223	<	assertEquals(2, lock.getQueueLength());
224	<	t1.interrupt();
225	<	Thread.sleep(SHORT_DELAY_MS);
226	<	assertEquals(1, lock.getQueueLength());
227	<	lock.unlock();
228	<	Thread.sleep(SHORT_DELAY_MS);
229	<	assertEquals(0, lock.getQueueLength());
230	<	t1.join();
231	<	t2.join();
232	<	} catch(Exception e){
233	<	unexpectedException();
234	<	}
235	<	}
216	>	sync.hasQueuedThread(null);
217	>	shouldThrow();
218	>	} catch (NullPointerException success) {}
219	>	}
220	>
221	>	/**
222	>	* hasQueuedThread reports whether a thread is queued.
223	>	*/
224	>	public void testHasQueuedThread() throws InterruptedException {
225	>	final ReentrantLock sync = new ReentrantLock();
226	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
227	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
228	>	assertFalse(sync.hasQueuedThread(t1));
229	>	assertFalse(sync.hasQueuedThread(t2));
230	>	sync.lock();
231	>	t1.start();
232	>	delay(SHORT_DELAY_MS);
233	>	assertTrue(sync.hasQueuedThread(t1));
234	>	t2.start();
235	>	delay(SHORT_DELAY_MS);
236	>	assertTrue(sync.hasQueuedThread(t1));
237	>	assertTrue(sync.hasQueuedThread(t2));
238	>	t1.interrupt();
239	>	delay(SHORT_DELAY_MS);
240	>	assertFalse(sync.hasQueuedThread(t1));
241	>	assertTrue(sync.hasQueuedThread(t2));
242	>	sync.unlock();
243	>	delay(SHORT_DELAY_MS);
244	>	assertFalse(sync.hasQueuedThread(t1));
245	>	delay(SHORT_DELAY_MS);
246	>	assertFalse(sync.hasQueuedThread(t2));
247	>	awaitTermination(t1);
248	>	awaitTermination(t2);
249	>	}
250	>
251
252		/**
253		* getQueuedThreads includes waiting threads
254		*/
255	<	public void testGetQueuedThreads() {
256	<	final PublicReentrantLock lock = new PublicReentrantLock();
255	>	public void testGetQueuedThreads() throws InterruptedException {
256	>	final PublicReentrantLock lock = new PublicReentrantLock();
257		Thread t1 = new Thread(new InterruptedLockRunnable(lock));
258		Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
259	<	try {
260	<	assertTrue(lock.getQueuedThreads().isEmpty());
261	<	lock.lock();
262	<	assertTrue(lock.getQueuedThreads().isEmpty());
263	<	t1.start();
264	<	Thread.sleep(SHORT_DELAY_MS);
265	<	assertTrue(lock.getQueuedThreads().contains(t1));
266	<	t2.start();
267	<	Thread.sleep(SHORT_DELAY_MS);
268	<	assertTrue(lock.getQueuedThreads().contains(t1));
269	<	assertTrue(lock.getQueuedThreads().contains(t2));
270	<	t1.interrupt();
271	<	Thread.sleep(SHORT_DELAY_MS);
272	<	assertFalse(lock.getQueuedThreads().contains(t1));
273	<	assertTrue(lock.getQueuedThreads().contains(t2));
274	<	lock.unlock();
275	<	Thread.sleep(SHORT_DELAY_MS);
276	<	assertTrue(lock.getQueuedThreads().isEmpty());
277	<	t1.join();
278	<	t2.join();
172	<	} catch(Exception e){
173	<	unexpectedException();
174	<	}
175	<	}
259	>	assertTrue(lock.getQueuedThreads().isEmpty());
260	>	lock.lock();
261	>	assertTrue(lock.getQueuedThreads().isEmpty());
262	>	t1.start();
263	>	delay(SHORT_DELAY_MS);
264	>	assertTrue(lock.getQueuedThreads().contains(t1));
265	>	t2.start();
266	>	delay(SHORT_DELAY_MS);
267	>	assertTrue(lock.getQueuedThreads().contains(t1));
268	>	assertTrue(lock.getQueuedThreads().contains(t2));
269	>	t1.interrupt();
270	>	delay(SHORT_DELAY_MS);
271	>	assertFalse(lock.getQueuedThreads().contains(t1));
272	>	assertTrue(lock.getQueuedThreads().contains(t2));
273	>	lock.unlock();
274	>	delay(SHORT_DELAY_MS);
275	>	assertTrue(lock.getQueuedThreads().isEmpty());
276	>	awaitTermination(t1);
277	>	awaitTermination(t2);
278	>	}
279
280
281		/**
282	<	* timed trylock is interruptible.
282	>	* timed tryLock is interruptible.
283		*/
284	<	public void testInterruptedException2() {
285	<	final ReentrantLock lock = new ReentrantLock();
286	<	lock.lock();
287	<	Thread t = new Thread(new Runnable() {
288	<	public void run() {
289	<	try {
290	<	lock.tryLock(MEDIUM_DELAY_MS,TimeUnit.MILLISECONDS);
291	<	threadShouldThrow();
292	<	} catch(InterruptedException success){}
293	<	}
294	<	});
192	<	try {
193	<	t.start();
194	<	t.interrupt();
195	<	} catch(Exception e){
196	<	unexpectedException();
197	<	}
284	>	public void testInterruptedException2() throws InterruptedException {
285	>	final ReentrantLock lock = new ReentrantLock();
286	>	lock.lock();
287	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
288	>	public void realRun() throws InterruptedException {
289	>	lock.tryLock(MEDIUM_DELAY_MS,MILLISECONDS);
290	>	}});
291	>
292	>	delay(SHORT_DELAY_MS);
293	>	t.interrupt();
294	>	awaitTermination(t);
295		}
296
297
298		/**
299	<	* Trylock on a locked lock fails
299	>	* TryLock on a locked lock fails
300		*/
301	<	public void testTryLockWhenLocked() {
302	<	final ReentrantLock lock = new ReentrantLock();
303	<	lock.lock();
304	<	Thread t = new Thread(new Runnable() {
305	<	public void run() {
306	<	threadAssertFalse(lock.tryLock());
307	<	}
308	<	});
309	<	try {
310	<	t.start();
311	<	t.join();
215	<	lock.unlock();
216	<	} catch(Exception e){
217	<	unexpectedException();
218	<	}
219	<	}
301	>	public void testTryLockWhenLocked() throws InterruptedException {
302	>	final ReentrantLock lock = new ReentrantLock();
303	>	lock.lock();
304	>	Thread t = newStartedThread(new CheckedRunnable() {
305	>	public void realRun() {
306	>	assertFalse(lock.tryLock());
307	>	}});
308	>
309	>	awaitTermination(t);
310	>	lock.unlock();
311	>	}
312
313		/**
314	<	* Timed trylock on a locked lock times out
314	>	* Timed tryLock on a locked lock times out
315		*/
316	<	public void testTryLock_Timeout() {
317	<	final ReentrantLock lock = new ReentrantLock();
318	<	lock.lock();
319	<	Thread t = new Thread(new Runnable() {
320	<	public void run() {
321	<	try {
322	<	threadAssertFalse(lock.tryLock(1, TimeUnit.MILLISECONDS));
323	<	} catch (Exception ex) {
324	<	threadUnexpectedException();
325	<	}
326	<	}
327	<	});
236	<	try {
237	<	t.start();
238	<	t.join();
239	<	lock.unlock();
240	<	} catch(Exception e){
241	<	unexpectedException();
242	<	}
243	<	}
244	<
316	>	public void testTryLock_Timeout() throws InterruptedException {
317	>	final ReentrantLock lock = new ReentrantLock();
318	>	lock.lock();
319	>	Thread t = newStartedThread(new CheckedRunnable() {
320	>	public void realRun() throws InterruptedException {
321	>	assertFalse(lock.tryLock(1, MILLISECONDS));
322	>	}});
323	>
324	>	awaitTermination(t);
325	>	lock.unlock();
326	>	}
327	>
328		/**
329		* getHoldCount returns number of recursive holds
330		*/
331		public void testGetHoldCount() {
332	<	ReentrantLock lock = new ReentrantLock();
333	<	for(int i = 1; i <= SIZE; i++) {
334	<	lock.lock();
335	<	assertEquals(i,lock.getHoldCount());
336	<	}
337	<	for(int i = SIZE; i > 0; i--) {
338	<	lock.unlock();
339	<	assertEquals(i-1,lock.getHoldCount());
340	<	}
332	>	ReentrantLock lock = new ReentrantLock();
333	>	for (int i = 1; i <= SIZE; i++) {
334	>	lock.lock();
335	>	assertEquals(i, lock.getHoldCount());
336	>	}
337	>	for (int i = SIZE; i > 0; i--) {
338	>	lock.unlock();
339	>	assertEquals(i-1, lock.getHoldCount());
340	>	}
341		}
342	<
343	<
342	>
343	>
344		/**
345		* isLocked is true when locked and false when not
346		*/
347	<	public void testIsLocked() {
348	<	final ReentrantLock lock = new ReentrantLock();
349	<	lock.lock();
350	<	assertTrue(lock.isLocked());
351	<	lock.unlock();
352	<	assertFalse(lock.isLocked());
353	<	Thread t = new Thread(new Runnable() {
354	<	public void run() {
355	<	lock.lock();
356	<	try {
357	<	Thread.sleep(SMALL_DELAY_MS);
358	<	}
359	<	catch(Exception e) {
360	<	threadUnexpectedException();
361	<	}
362	<	lock.unlock();
363	<	}
281	<	});
282	<	try {
283	<	t.start();
284	<	Thread.sleep(SHORT_DELAY_MS);
285	<	assertTrue(lock.isLocked());
286	<	t.join();
287	<	assertFalse(lock.isLocked());
288	<	} catch(Exception e){
289	<	unexpectedException();
290	<	}
347	>	public void testIsLocked() throws InterruptedException {
348	>	final ReentrantLock lock = new ReentrantLock();
349	>	lock.lock();
350	>	assertTrue(lock.isLocked());
351	>	lock.unlock();
352	>	assertFalse(lock.isLocked());
353	>	Thread t = newStartedThread(new CheckedRunnable() {
354	>	public void realRun() throws InterruptedException {
355	>	lock.lock();
356	>	delay(SMALL_DELAY_MS);
357	>	lock.unlock();
358	>	}});
359	>
360	>	delay(SHORT_DELAY_MS);
361	>	assertTrue(lock.isLocked());
362	>	awaitTermination(t);
363	>	assertFalse(lock.isLocked());
364		}
365
366
367		/**
368		* lockInterruptibly is interruptible.
369		*/
370	<	public void testLockInterruptibly1() {
371	<	final ReentrantLock lock = new ReentrantLock();
372	<	lock.lock();
373	<	Thread t = new Thread(new InterruptedLockRunnable(lock));
374	<	try {
375	<	t.start();
376	<	t.interrupt();
377	<	lock.unlock();
378	<	t.join();
379	<	} catch(Exception e){
307	<	unexpectedException();
308	<	}
309	<	}
370	>	public void testLockInterruptibly1() throws InterruptedException {
371	>	final ReentrantLock lock = new ReentrantLock();
372	>	lock.lock();
373	>	Thread t = newStartedThread(new InterruptedLockRunnable(lock));
374	>	delay(SHORT_DELAY_MS);
375	>	t.interrupt();
376	>	delay(SHORT_DELAY_MS);
377	>	lock.unlock();
378	>	awaitTermination(t);
379	>	}
380
381		/**
382		* lockInterruptibly succeeds when unlocked, else is interruptible
383		*/
384	<	public void testLockInterruptibly2() {
385	<	final ReentrantLock lock = new ReentrantLock();
386	<	try {
387	<	lock.lockInterruptibly();
388	<	} catch(Exception e) {
389	<	unexpectedException();
390	<	}
391	<	Thread t = new Thread(new InterruptedLockRunnable(lock));
392	<	try {
323	<	t.start();
324	<	t.interrupt();
325	<	assertTrue(lock.isLocked());
326	<	assertTrue(lock.isHeldByCurrentThread());
327	<	t.join();
328	<	} catch(Exception e){
329	<	unexpectedException();
330	<	}
384	>	public void testLockInterruptibly2() throws InterruptedException {
385	>	final ReentrantLock lock = new ReentrantLock();
386	>	lock.lockInterruptibly();
387	>	Thread t = newStartedThread(new InterruptedLockRunnable(lock));
388	>	delay(SHORT_DELAY_MS);
389	>	t.interrupt();
390	>	assertTrue(lock.isLocked());
391	>	assertTrue(lock.isHeldByCurrentThread());
392	>	awaitTermination(t);
393		}
394
395		/**
396		* Calling await without holding lock throws IllegalMonitorStateException
397		*/
398	<	public void testAwait_IllegalMonitor() {
399	<	final ReentrantLock lock = new ReentrantLock();
398	>	public void testAwait_IllegalMonitor() throws InterruptedException {
399	>	final ReentrantLock lock = new ReentrantLock();
400		final Condition c = lock.newCondition();
401		try {
402		c.await();
403		shouldThrow();
404	<	}
343	<	catch (IllegalMonitorStateException success) {
344	<	}
345	<	catch (Exception ex) {
346	<	unexpectedException();
347	<	}
404	>	} catch (IllegalMonitorStateException success) {}
405		}
406
407		/**
408		* Calling signal without holding lock throws IllegalMonitorStateException
409		*/
410		public void testSignal_IllegalMonitor() {
411	<	final ReentrantLock lock = new ReentrantLock();
411	>	final ReentrantLock lock = new ReentrantLock();
412		final Condition c = lock.newCondition();
413		try {
414		c.signal();
415		shouldThrow();
416	<	}
360	<	catch (IllegalMonitorStateException success) {
361	<	}
362	<	catch (Exception ex) {
363	<	unexpectedException();
364	<	}
416	>	} catch (IllegalMonitorStateException success) {}
417		}
418
419		/**
420		* awaitNanos without a signal times out
421		*/
422	<	public void testAwaitNanos_Timeout() {
423	<	final ReentrantLock lock = new ReentrantLock();
422	>	public void testAwaitNanos_Timeout() throws InterruptedException {
423	>	final ReentrantLock lock = new ReentrantLock();
424		final Condition c = lock.newCondition();
425	+	lock.lock();
426	+	long t = c.awaitNanos(100);
427	+	assertTrue(t <= 0);
428	+	lock.unlock();
429	+	}
430	+
431	+	/**
432	+	* timed await without a signal times out
433	+	*/
434	+	public void testAwait_Timeout() throws InterruptedException {
435	+	final ReentrantLock lock = new ReentrantLock();
436	+	final Condition c = lock.newCondition();
437	+	lock.lock();
438	+	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
439	+	lock.unlock();
440	+	}
441	+
442	+	/**
443	+	* awaitUntil without a signal times out
444	+	*/
445	+	public void testAwaitUntil_Timeout() throws InterruptedException {
446	+	final ReentrantLock lock = new ReentrantLock();
447	+	final Condition c = lock.newCondition();
448	+	lock.lock();
449	+	java.util.Date d = new java.util.Date();
450	+	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
451	+	lock.unlock();
452	+	}
453	+
454	+	/**
455	+	* await returns when signalled
456	+	*/
457	+	public void testAwait() throws InterruptedException {
458	+	final ReentrantLock lock = new ReentrantLock();
459	+	final Condition c = lock.newCondition();
460	+	Thread t = newStartedThread(new CheckedRunnable() {
461	+	public void realRun() throws InterruptedException {
462	+	lock.lock();
463	+	c.await();
464	+	lock.unlock();
465	+	}});
466	+
467	+	delay(SHORT_DELAY_MS);
468	+	lock.lock();
469	+	c.signal();
470	+	lock.unlock();
471	+	awaitTermination(t);
472	+	}
473	+
474	+	/**
475	+	* hasWaiters throws NPE if null
476	+	*/
477	+	public void testHasWaitersNPE() {
478	+	final ReentrantLock lock = new ReentrantLock();
479		try {
480	<	lock.lock();
481	<	long t = c.awaitNanos(100);
482	<	assertTrue(t <= 0);
483	<	lock.unlock();
484	<	}
485	<	catch (Exception ex) {
486	<	unexpectedException();
487	<	}
480	>	lock.hasWaiters(null);
481	>	shouldThrow();
482	>	} catch (NullPointerException success) {}
483	>	}
484	>
485	>	/**
486	>	* getWaitQueueLength throws NPE if null
487	>	*/
488	>	public void testGetWaitQueueLengthNPE() {
489	>	final ReentrantLock lock = new ReentrantLock();
490	>	try {
491	>	lock.getWaitQueueLength(null);
492	>	shouldThrow();
493	>	} catch (NullPointerException success) {}
494	>	}
495	>
496	>
497	>	/**
498	>	* getWaitingThreads throws NPE if null
499	>	*/
500	>	public void testGetWaitingThreadsNPE() {
501	>	final PublicReentrantLock lock = new PublicReentrantLock();
502	>	try {
503	>	lock.getWaitingThreads(null);
504	>	shouldThrow();
505	>	} catch (NullPointerException success) {}
506		}
507
508	+
509		/**
510	<	*  timed await without a signal times out
510	>	* hasWaiters throws IAE if not owned
511		*/
512	<	public void testAwait_Timeout() {
513	<	final ReentrantLock lock = new ReentrantLock();
512	>	public void testHasWaitersIAE() {
513	>	final ReentrantLock lock = new ReentrantLock();
514		final Condition c = lock.newCondition();
515	+	final ReentrantLock lock2 = new ReentrantLock();
516		try {
517	<	lock.lock();
518	<	assertFalse(c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
519	<	lock.unlock();
394	<	}
395	<	catch (Exception ex) {
396	<	unexpectedException();
397	<	}
517	>	lock2.hasWaiters(c);
518	>	shouldThrow();
519	>	} catch (IllegalArgumentException success) {}
520		}
521
522		/**
523	<	* awaitUntil without a signal times out
523	>	* hasWaiters throws IMSE if not locked
524		*/
525	<	public void testAwaitUntil_Timeout() {
526	<	final ReentrantLock lock = new ReentrantLock();
525	>	public void testHasWaitersIMSE() {
526	>	final ReentrantLock lock = new ReentrantLock();
527		final Condition c = lock.newCondition();
528		try {
529	<	lock.lock();
530	<	java.util.Date d = new java.util.Date();
531	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
410	<	lock.unlock();
411	<	}
412	<	catch (Exception ex) {
413	<	unexpectedException();
414	<	}
529	>	lock.hasWaiters(c);
530	>	shouldThrow();
531	>	} catch (IllegalMonitorStateException success) {}
532		}
533
534	+
535		/**
536	<	* await returns when signalled
536	>	* getWaitQueueLength throws IAE if not owned
537		*/
538	<	public void testAwait() {
539	<	final ReentrantLock lock = new ReentrantLock();
540	<	final AbstractQueuedSynchronizer.ConditionObject c = lock.newCondition();
541	<	Thread t = new Thread(new Runnable() {
542	<	public void run() {
543	<	try {
544	<	lock.lock();
545	<	c.await();
546	<	lock.unlock();
429	<	}
430	<	catch(InterruptedException e) {
431	<	threadUnexpectedException();
432	<	}
433	<	}
434	<	});
538	>	public void testGetWaitQueueLengthIAE() {
539	>	final ReentrantLock lock = new ReentrantLock();
540	>	final Condition c = lock.newCondition();
541	>	final ReentrantLock lock2 = new ReentrantLock();
542	>	try {
543	>	lock2.getWaitQueueLength(c);
544	>	shouldThrow();
545	>	} catch (IllegalArgumentException success) {}
546	>	}
547
548	+	/**
549	+	* getWaitQueueLength throws IMSE if not locked
550	+	*/
551	+	public void testGetWaitQueueLengthIMSE() {
552	+	final ReentrantLock lock = new ReentrantLock();
553	+	final Condition c = lock.newCondition();
554		try {
555	<	t.start();
556	<	Thread.sleep(SHORT_DELAY_MS);
557	<	lock.lock();
440	<	c.signal();
441	<	lock.unlock();
442	<	t.join(SHORT_DELAY_MS);
443	<	assertFalse(t.isAlive());
444	<	}
445	<	catch (Exception ex) {
446	<	unexpectedException();
447	<	}
555	>	lock.getWaitQueueLength(c);
556	>	shouldThrow();
557	>	} catch (IllegalMonitorStateException success) {}
558		}
559
560	+
561		/**
562	<	* hasWaiters returns true when a thread is waiting, else false
562	>	* getWaitingThreads throws IAE if not owned
563		*/
564	<	public void testHasWaiters() {
565	<	final ReentrantLock lock = new ReentrantLock();
566	<	final AbstractQueuedSynchronizer.ConditionObject c = lock.newCondition();
567	<	Thread t = new Thread(new Runnable() {
568	<	public void run() {
569	<	try {
570	<	lock.lock();
571	<	threadAssertFalse(c.hasWaiters());
572	<	threadAssertEquals(0, c.getWaitQueueLength());
462	<	c.await();
463	<	lock.unlock();
464	<	}
465	<	catch(InterruptedException e) {
466	<	threadUnexpectedException();
467	<	}
468	<	}
469	<	});
564	>	public void testGetWaitingThreadsIAE() {
565	>	final PublicReentrantLock lock = new PublicReentrantLock();
566	>	final Condition c = lock.newCondition();
567	>	final PublicReentrantLock lock2 = new PublicReentrantLock();
568	>	try {
569	>	lock2.getWaitingThreads(c);
570	>	shouldThrow();
571	>	} catch (IllegalArgumentException success) {}
572	>	}
573
574	+	/**
575	+	* getWaitingThreads throws IMSE if not locked
576	+	*/
577	+	public void testGetWaitingThreadsIMSE() {
578	+	final PublicReentrantLock lock = new PublicReentrantLock();
579	+	final Condition c = lock.newCondition();
580		try {
581	<	t.start();
582	<	Thread.sleep(SHORT_DELAY_MS);
583	<	lock.lock();
584	<	assertTrue(c.hasWaiters());
585	<	assertEquals(1, c.getWaitQueueLength());
586	<	c.signal();
587	<	lock.unlock();
588	<	Thread.sleep(SHORT_DELAY_MS);
589	<	lock.lock();
590	<	assertFalse(c.hasWaiters());
591	<	assertEquals(0, c.getWaitQueueLength());
592	<	lock.unlock();
593	<	t.join(SHORT_DELAY_MS);
594	<	assertFalse(t.isAlive());
595	<	}
596	<	catch (Exception ex) {
597	<	unexpectedException();
598	<	}
581	>	lock.getWaitingThreads(c);
582	>	shouldThrow();
583	>	} catch (IllegalMonitorStateException success) {}
584	>	}
585	>
586	>
587	>	/**
588	>	* hasWaiters returns true when a thread is waiting, else false
589	>	*/
590	>	public void testHasWaiters() throws InterruptedException {
591	>	final ReentrantLock lock = new ReentrantLock();
592	>	final Condition c = lock.newCondition();
593	>	Thread t = newStartedThread(new CheckedRunnable() {
594	>	public void realRun() throws InterruptedException {
595	>	lock.lock();
596	>	assertFalse(lock.hasWaiters(c));
597	>	assertEquals(0, lock.getWaitQueueLength(c));
598	>	c.await();
599	>	lock.unlock();
600	>	}});
601	>
602	>	delay(SHORT_DELAY_MS);
603	>	lock.lock();
604	>	assertTrue(lock.hasWaiters(c));
605	>	assertEquals(1, lock.getWaitQueueLength(c));
606	>	c.signal();
607	>	lock.unlock();
608	>	delay(SHORT_DELAY_MS);
609	>	lock.lock();
610	>	assertFalse(lock.hasWaiters(c));
611	>	assertEquals(0, lock.getWaitQueueLength(c));
612	>	lock.unlock();
613	>	awaitTermination(t);
614		}
615
616		/**
617		* getWaitQueueLength returns number of waiting threads
618		*/
619	<	public void testGetWaitQueueLength() {
620	<	final ReentrantLock lock = new ReentrantLock();
621	<	final AbstractQueuedSynchronizer.ConditionObject c = lock.newCondition();
622	<	Thread t1 = new Thread(new Runnable() {
623	<	public void run() {
624	<	try {
625	<	lock.lock();
626	<	threadAssertFalse(c.hasWaiters());
627	<	threadAssertEquals(0, c.getWaitQueueLength());
628	<	c.await();
629	<	lock.unlock();
630	<	}
631	<	catch(InterruptedException e) {
632	<	threadUnexpectedException();
633	<	}
634	<	}
635	<	});
636	<
637	<	Thread t2 = new Thread(new Runnable() {
638	<	public void run() {
639	<	try {
640	<	lock.lock();
641	<	threadAssertTrue(c.hasWaiters());
642	<	threadAssertEquals(1, c.getWaitQueueLength());
643	<	c.await();
644	<	lock.unlock();
645	<	}
646	<	catch(InterruptedException e) {
647	<	threadUnexpectedException();
648	<	}
649	<	}
650	<	});
651	<
652	<	try {
653	<	t1.start();
654	<	Thread.sleep(SHORT_DELAY_MS);
655	<	t2.start();
656	<	Thread.sleep(SHORT_DELAY_MS);
657	<	lock.lock();
658	<	assertTrue(c.hasWaiters());
659	<	assertEquals(2, c.getWaitQueueLength());
660	<	c.signalAll();
661	<	lock.unlock();
662	<	Thread.sleep(SHORT_DELAY_MS);
663	<	lock.lock();
664	<	assertFalse(c.hasWaiters());
665	<	assertEquals(0, c.getWaitQueueLength());
619	>	public void testGetWaitQueueLength() throws InterruptedException {
620	>	final ReentrantLock lock = new ReentrantLock();
621	>	final Condition c = lock.newCondition();
622	>	Thread t1 = newStartedThread(new CheckedRunnable() {
623	>	public void realRun() throws InterruptedException {
624	>	lock.lock();
625	>	assertFalse(lock.hasWaiters(c));
626	>	assertEquals(0, lock.getWaitQueueLength(c));
627	>	c.await();
628	>	lock.unlock();
629	>	}});
630	>
631	>	delay(SHORT_DELAY_MS);
632	>
633	>	Thread t2 = newStartedThread(new CheckedRunnable() {
634	>	public void realRun() throws InterruptedException {
635	>	lock.lock();
636	>	assertTrue(lock.hasWaiters(c));
637	>	assertEquals(1, lock.getWaitQueueLength(c));
638	>	c.await();
639	>	lock.unlock();
640	>	}});
641	>
642	>	delay(SHORT_DELAY_MS);
643	>	lock.lock();
644	>	assertTrue(lock.hasWaiters(c));
645	>	assertEquals(2, lock.getWaitQueueLength(c));
646	>	c.signalAll();
647	>	lock.unlock();
648	>	delay(SHORT_DELAY_MS);
649	>	lock.lock();
650	>	assertFalse(lock.hasWaiters(c));
651	>	assertEquals(0, lock.getWaitQueueLength(c));
652	>	lock.unlock();
653	>	awaitTermination(t1);
654	>	awaitTermination(t2);
655	>	}
656	>
657	>	/**
658	>	* getWaitingThreads returns only and all waiting threads
659	>	*/
660	>	public void testGetWaitingThreads() throws InterruptedException {
661	>	final PublicReentrantLock lock = new PublicReentrantLock();
662	>	final Condition c = lock.newCondition();
663	>	Thread t1 = new Thread(new CheckedRunnable() {
664	>	public void realRun() throws InterruptedException {
665	>	lock.lock();
666	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
667	>	c.await();
668	>	lock.unlock();
669	>	}});
670	>
671	>	Thread t2 = new Thread(new CheckedRunnable() {
672	>	public void realRun() throws InterruptedException {
673	>	lock.lock();
674	>	assertFalse(lock.getWaitingThreads(c).isEmpty());
675	>	c.await();
676	>	lock.unlock();
677	>	}});
678	>
679	>	lock.lock();
680	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
681	>	lock.unlock();
682	>	t1.start();
683	>	delay(SHORT_DELAY_MS);
684	>	t2.start();
685	>	delay(SHORT_DELAY_MS);
686	>	lock.lock();
687	>	assertTrue(lock.hasWaiters(c));
688	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
689	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
690	>	c.signalAll();
691	>	lock.unlock();
692	>	delay(SHORT_DELAY_MS);
693	>	lock.lock();
694	>	assertFalse(lock.hasWaiters(c));
695	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
696	>	lock.unlock();
697	>	awaitTermination(t1);
698	>	awaitTermination(t2);
699	>	}
700	>
701	>	/** A helper class for uninterruptible wait tests */
702	>	class UninterruptibleThread extends Thread {
703	>	private ReentrantLock lock;
704	>	private Condition c;
705	>
706	>	public volatile boolean canAwake = false;
707	>	public volatile boolean interrupted = false;
708	>	public volatile boolean lockStarted = false;
709	>
710	>	public UninterruptibleThread(ReentrantLock lock, Condition c) {
711	>	this.lock = lock;
712	>	this.c = c;
713	>	}
714	>
715	>	public synchronized void run() {
716	>	lock.lock();
717	>	lockStarted = true;
718	>
719	>	while (!canAwake) {
720	>	c.awaitUninterruptibly();
721	>	}
722	>
723	>	interrupted = isInterrupted();
724		lock.unlock();
543	–	t1.join(SHORT_DELAY_MS);
544	–	t2.join(SHORT_DELAY_MS);
545	–	assertFalse(t1.isAlive());
546	–	assertFalse(t2.isAlive());
547	–	}
548	–	catch (Exception ex) {
549	–	unexpectedException();
725		}
726		}
727
728		/**
729		* awaitUninterruptibly doesn't abort on interrupt
730		*/
731	<	public void testAwaitUninterruptibly() {
732	<	final ReentrantLock lock = new ReentrantLock();
731	>	public void testAwaitUninterruptibly() throws InterruptedException {
732	>	final ReentrantLock lock = new ReentrantLock();
733		final Condition c = lock.newCondition();
734	<	Thread t = new Thread(new Runnable() {
735	<	public void run() {
736	<	lock.lock();
562	<	c.awaitUninterruptibly();
563	<	lock.unlock();
564	<	}
565	<	});
734	>	UninterruptibleThread thread = new UninterruptibleThread(lock, c);
735	>
736	>	thread.start();
737
738	+	while (!thread.lockStarted) {
739	+	delay(100);
740	+	}
741	+
742	+	lock.lock();
743		try {
744	<	t.start();
745	<	Thread.sleep(SHORT_DELAY_MS);
570	<	t.interrupt();
571	<	lock.lock();
744	>	thread.interrupt();
745	>	thread.canAwake = true;
746		c.signal();
747	+	} finally {
748		lock.unlock();
574	–	assert(t.isInterrupted());
575	–	t.join(SHORT_DELAY_MS);
576	–	assertFalse(t.isAlive());
577	–	}
578	–	catch (Exception ex) {
579	–	unexpectedException();
749		}
750	+
751	+	thread.join();
752	+	assertTrue(thread.interrupted);
753	+	assertFalse(thread.isAlive());
754		}
755
756		/**
757		* await is interruptible
758		*/
759	<	public void testAwait_Interrupt() {
760	<	final ReentrantLock lock = new ReentrantLock();
759	>	public void testAwait_Interrupt() throws InterruptedException {
760	>	final PublicReentrantLock lock = new PublicReentrantLock();
761		final Condition c = lock.newCondition();
762	<	Thread t = new Thread(new Runnable() {
763	<	public void run() {
764	<	try {
765	<	lock.lock();
766	<	c.await();
767	<	lock.unlock();
768	<	threadShouldThrow();
769	<	}
770	<	catch(InterruptedException success) {
771	<	}
772	<	}
773	<	});
774	<
775	<	try {
776	<	t.start();
777	<	Thread.sleep(SHORT_DELAY_MS);
778	<	t.interrupt();
779	<	t.join(SHORT_DELAY_MS);
780	<	assertFalse(t.isAlive());
781	<	}
782	<	catch (Exception ex) {
783	<	unexpectedException();
784	<	}
762	>	final CountDownLatch locked = new CountDownLatch(1);
763	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
764	>	public void realRun() throws InterruptedException {
765	>	lock.lock();
766	>	assertTrue(lock.isLocked());
767	>	assertTrue(lock.isHeldByCurrentThread());
768	>	assertHasNoWaiters(lock, c);
769	>	locked.countDown();
770	>	try {
771	>	c.await();
772	>	} finally {
773	>	assertTrue(lock.isLocked());
774	>	assertTrue(lock.isHeldByCurrentThread());
775	>	assertHasNoWaiters(lock, c);
776	>	lock.unlock();
777	>	assertFalse(Thread.interrupted());
778	>	}
779	>	}});
780	>
781	>	locked.await();
782	>	assertHasWaiters(lock, c, t);
783	>	t.interrupt();
784	>	awaitTermination(t);
785	>	assertFalse(lock.isLocked());
786		}
787
788		/**
789		* awaitNanos is interruptible
790		*/
791	<	public void testAwaitNanos_Interrupt() {
792	<	final ReentrantLock lock = new ReentrantLock();
791	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
792	>	final ReentrantLock lock = new ReentrantLock();
793		final Condition c = lock.newCondition();
794	<	Thread t = new Thread(new Runnable() {
795	<	public void run() {
796	<	try {
797	<	lock.lock();
798	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
799	<	lock.unlock();
800	<	threadShouldThrow();
801	<	}
802	<	catch(InterruptedException success) {
629	<	}
630	<	}
631	<	});
632	<
633	<	try {
634	<	t.start();
635	<	Thread.sleep(SHORT_DELAY_MS);
636	<	t.interrupt();
637	<	t.join(SHORT_DELAY_MS);
638	<	assertFalse(t.isAlive());
639	<	}
640	<	catch (Exception ex) {
641	<	unexpectedException();
642	<	}
794	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
795	>	public void realRun() throws InterruptedException {
796	>	lock.lock();
797	>	c.awaitNanos(MILLISECONDS.toNanos(LONG_DELAY_MS));
798	>	}});
799	>
800	>	delay(SHORT_DELAY_MS);
801	>	t.interrupt();
802	>	awaitTermination(t);
803		}
804
805		/**
806		* awaitUntil is interruptible
807		*/
808	<	public void testAwaitUntil_Interrupt() {
809	<	final ReentrantLock lock = new ReentrantLock();
808	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
809	>	final ReentrantLock lock = new ReentrantLock();
810		final Condition c = lock.newCondition();
811	<	Thread t = new Thread(new Runnable() {
812	<	public void run() {
813	<	try {
814	<	lock.lock();
815	<	java.util.Date d = new java.util.Date();
816	<	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
817	<	lock.unlock();
818	<	threadShouldThrow();
819	<	}
820	<	catch(InterruptedException success) {
661	<	}
662	<	}
663	<	});
664	<
665	<	try {
666	<	t.start();
667	<	Thread.sleep(SHORT_DELAY_MS);
668	<	t.interrupt();
669	<	t.join(SHORT_DELAY_MS);
670	<	assertFalse(t.isAlive());
671	<	}
672	<	catch (Exception ex) {
673	<	unexpectedException();
674	<	}
811	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
812	>	public void realRun() throws InterruptedException {
813	>	lock.lock();
814	>	java.util.Date d = new java.util.Date();
815	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
816	>	}});
817	>
818	>	delay(SHORT_DELAY_MS);
819	>	t.interrupt();
820	>	awaitTermination(t);
821		}
822
823		/**
824		* signalAll wakes up all threads
825		*/
826	<	public void testSignalAll() {
827	<	final ReentrantLock lock = new ReentrantLock();
826	>	public void testSignalAll() throws InterruptedException {
827	>	final ReentrantLock lock = new ReentrantLock();
828		final Condition c = lock.newCondition();
829	<	Thread t1 = new Thread(new Runnable() {
830	<	public void run() {
831	<	try {
832	<	lock.lock();
833	<	c.await();
834	<	lock.unlock();
835	<	}
836	<	catch(InterruptedException e) {
837	<	threadUnexpectedException();
838	<	}
839	<	}
840	<	});
841	<
842	<	Thread t2 = new Thread(new Runnable() {
843	<	public void run() {
844	<	try {
845	<	lock.lock();
846	<	c.await();
847	<	lock.unlock();
848	<	}
849	<	catch(InterruptedException e) {
850	<	threadUnexpectedException();
851	<	}
852	<	}
853	<	});
854	<
855	<	try {
856	<	t1.start();
857	<	t2.start();
858	<	Thread.sleep(SHORT_DELAY_MS);
859	<	lock.lock();
860	<	c.signalAll();
861	<	lock.unlock();
862	<	t1.join(SHORT_DELAY_MS);
863	<	t2.join(SHORT_DELAY_MS);
864	<	assertFalse(t1.isAlive());
865	<	assertFalse(t2.isAlive());
866	<	}
867	<	catch (Exception ex) {
868	<	unexpectedException();
869	<	}
829	>	Thread t1 = newStartedThread(new CheckedRunnable() {
830	>	public void realRun() throws InterruptedException {
831	>	lock.lock();
832	>	c.await();
833	>	lock.unlock();
834	>	}});
835	>
836	>	Thread t2 = newStartedThread(new CheckedRunnable() {
837	>	public void realRun() throws InterruptedException {
838	>	lock.lock();
839	>	c.await();
840	>	lock.unlock();
841	>	}});
842	>
843	>	delay(SHORT_DELAY_MS);
844	>	lock.lock();
845	>	c.signalAll();
846	>	lock.unlock();
847	>	awaitTermination(t1);
848	>	awaitTermination(t2);
849	>	}
850	>
851	>	/**
852	>	* await after multiple reentrant locking preserves lock count
853	>	*/
854	>	public void testAwaitLockCount() throws InterruptedException {
855	>	final ReentrantLock lock = new ReentrantLock();
856	>	final Condition c = lock.newCondition();
857	>	Thread t1 = newStartedThread(new CheckedRunnable() {
858	>	public void realRun() throws InterruptedException {
859	>	lock.lock();
860	>	assertEquals(1, lock.getHoldCount());
861	>	c.await();
862	>	assertEquals(1, lock.getHoldCount());
863	>	lock.unlock();
864	>	}});
865	>
866	>	Thread t2 = newStartedThread(new CheckedRunnable() {
867	>	public void realRun() throws InterruptedException {
868	>	lock.lock();
869	>	lock.lock();
870	>	assertEquals(2, lock.getHoldCount());
871	>	c.await();
872	>	assertEquals(2, lock.getHoldCount());
873	>	lock.unlock();
874	>	lock.unlock();
875	>	}});
876	>
877	>	delay(SHORT_DELAY_MS);
878	>	lock.lock();
879	>	c.signalAll();
880	>	lock.unlock();
881	>	awaitTermination(t1);
882	>	awaitTermination(t2);
883		}
884
885		/**
886		* A serialized lock deserializes as unlocked
887		*/
888	<	public void testSerialization() {
888	>	public void testSerialization() throws Exception {
889		ReentrantLock l = new ReentrantLock();
890		l.lock();
891		l.unlock();
892
893	<	try {
894	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
895	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
896	<	out.writeObject(l);
897	<	out.close();
898	<
899	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
900	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
901	<	ReentrantLock r = (ReentrantLock) in.readObject();
902	<	r.lock();
903	<	r.unlock();
904	<	} catch(Exception e){
905	<	e.printStackTrace();
906	<	unexpectedException();
907	<	}
893	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
894	>	ObjectOutputStream out =
895	>	new ObjectOutputStream(new BufferedOutputStream(bout));
896	>	out.writeObject(l);
897	>	out.close();
898	>
899	>	ByteArrayInputStream bin =
900	>	new ByteArrayInputStream(bout.toByteArray());
901	>	ObjectInputStream in =
902	>	new ObjectInputStream(new BufferedInputStream(bin));
903	>	ReentrantLock r = (ReentrantLock) in.readObject();
904	>	r.lock();
905	>	r.unlock();
906	>	}
907	>
908	>	/**
909	>	* toString indicates current lock state
910	>	*/
911	>	public void testToString() {
912	>	ReentrantLock lock = new ReentrantLock();
913	>	String us = lock.toString();
914	>	assertTrue(us.indexOf("Unlocked") >= 0);
915	>	lock.lock();
916	>	String ls = lock.toString();
917	>	assertTrue(ls.indexOf("Locked") >= 0);
918		}
919
920		}

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