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

Comparing jsr166/src/test/tck/ReentrantLockTest.java (file contents):
Revision 1.1 by dl, Sun Aug 31 19:24:55 2003 UTC vs.
Revision 1.45 by jsr166, Sat May 7 19:03:26 2011 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
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/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 TestCase {
13	<	static int HOLD_COUNT_TEST_LIMIT = 20;
14	<
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		}
18	–
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 extends CheckedRunnable {
28	>	final ReentrantLock lock;
29	>	InterruptibleLockRunnable(ReentrantLock l) { lock = l; }
30	>	public void realRun() throws InterruptedException {
31	>	lock.lockInterruptibly();
32	>	}
33	>	}
34	>
35	>	/**
36	>	* A runnable calling lockInterruptibly that expects to be
37	>	* interrupted
38	>	*/
39	>	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
40	>	final ReentrantLock lock;
41	>	InterruptedLockRunnable(ReentrantLock l) { lock = l; }
42	>	public void realRun() throws InterruptedException {
43	>	lock.lockInterruptibly();
44	>	}
45	>	}
46	>
47	>	/**
48	>	* Subclass to expose protected methods
49	>	*/
50	>	static class PublicReentrantLock extends ReentrantLock {
51	>	PublicReentrantLock() { super(); }
52	>	PublicReentrantLock(boolean fair) { super(fair); }
53	>	public Thread getOwner() {
54	>	return super.getOwner();
55	>	}
56	>	public Collection<Thread> getQueuedThreads() {
57	>	return super.getQueuedThreads();
58	>	}
59	>	public Collection<Thread> getWaitingThreads(Condition c) {
60	>	return super.getWaitingThreads(c);
61	>	}
62	>	}
63	>
64	>	/**
65	>	* Releases write lock, checking that it had a hold count of 1.
66	>	*/
67	>	void releaseLock(PublicReentrantLock lock) {
68	>	assertLockedBy(lock, Thread.currentThread());
69	>	lock.unlock();
70	>	assertFalse(lock.isHeldByCurrentThread());
71	>	assertNotLocked(lock);
72	>	}
73	>
74	>	/**
75	>	* Spin-waits until lock.hasQueuedThread(t) becomes true.
76	>	*/
77	>	void waitForQueuedThread(PublicReentrantLock lock, Thread t) {
78	>	long startTime = System.nanoTime();
79	>	while (!lock.hasQueuedThread(t)) {
80	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
81	>	throw new AssertionError("timed out");
82	>	Thread.yield();
83	>	}
84	>	assertTrue(t.isAlive());
85	>	assertTrue(lock.getOwner() != t);
86	>	}
87	>
88	>	/**
89	>	* Checks that lock is not locked.
90	>	*/
91	>	void assertNotLocked(PublicReentrantLock lock) {
92	>	assertFalse(lock.isLocked());
93	>	assertFalse(lock.isHeldByCurrentThread());
94	>	assertNull(lock.getOwner());
95	>	assertEquals(0, lock.getHoldCount());
96		}
97
98	<	private static long SHORT_DELAY_MS = 100;
99	<	private static long MEDIUM_DELAY_MS = 1000;
100	<	private static long LONG_DELAY_MS = 10000;
101	<
102	<	/*
103	<	* Unlocks an unlocked lock, throws Illegal Monitor State
104	<	*
105	<	*/
106	<
107	<	public void testIllegalMonitorStateException(){
108	<	ReentrantLock rl = new ReentrantLock();
109	<	try{
110	<	rl.unlock();
111	<	fail("Should of thown Illegal Monitor State Exception");
112	<
113	<	}catch(IllegalMonitorStateException sucess){}
114	<
115	<
116	<	}
117	<
118	<	/*
119	<	* makes a lock, locks it, tries to aquire the lock in another thread
120	<	* interrupts that thread and waits for an interrupted Exception to
121	<	* be thrown.
122	<	*/
123	<
124	<	public void testInterruptedException(){
125	<	final ReentrantLock lock = new ReentrantLock();
126	<	lock.lock();
127	<	Thread t = new Thread(new Runnable() {
128	<	public void run(){
129	<	try{
130	<	lock.lockInterruptibly();
131	<	fail("should throw");
132	<	}catch(InterruptedException sucess){}
133	<	}
134	<	});
135	<	t.start();
136	<	t.interrupt();
137	<	lock.unlock();
138	<	}
139	<
140	<	/*
141	<	* tests for interrupted exception on a timed wait
142	<	*
143	<	*/
144	<
145	<
146	<	public void testInterruptedException2(){
147	<	final ReentrantLock lock = new ReentrantLock();
148	<	lock.lock();
149	<	Thread t = new Thread(new Runnable() {
150	<	public void run(){
151	<	try{
152	<	lock.tryLock(1000,TimeUnit.MILLISECONDS);
153	<	fail("should throw");
154	<	}catch(InterruptedException sucess){}
155	<	}
156	<	});
157	<	t.start();
158	<	t.interrupt();
98	>	/**
99	>	* Checks that lock is locked by the given thread.
100	>	*/
101	>	void assertLockedBy(PublicReentrantLock lock, Thread t) {
102	>	assertTrue(lock.isLocked());
103	>	assertSame(t, lock.getOwner());
104	>	assertEquals(t == Thread.currentThread(),
105	>	lock.isHeldByCurrentThread());
106	>	assertEquals(t == Thread.currentThread(),
107	>	lock.getHoldCount() > 0);
108	>	}
109	>
110	>	/**
111	>	* Checks that condition c has no waiters.
112	>	*/
113	>	void assertHasNoWaiters(PublicReentrantLock lock, Condition c) {
114	>	assertHasWaiters(lock, c, new Thread[] {});
115	>	}
116	>
117	>	/**
118	>	* Checks that condition c has exactly the given waiter threads.
119	>	*/
120	>	void assertHasWaiters(PublicReentrantLock lock, Condition c,
121	>	Thread... threads) {
122	>	lock.lock();
123	>	assertEquals(threads.length > 0, lock.hasWaiters(c));
124	>	assertEquals(threads.length, lock.getWaitQueueLength(c));
125	>	assertEquals(threads.length == 0, lock.getWaitingThreads(c).isEmpty());
126	>	assertEquals(threads.length, lock.getWaitingThreads(c).size());
127	>	assertEquals(new HashSet<Thread>(lock.getWaitingThreads(c)),
128	>	new HashSet<Thread>(Arrays.asList(threads)));
129	>	lock.unlock();
130	>	}
131	>
132	>	/**
133	>	* Constructor sets given fairness, and is in unlocked state
134	>	*/
135	>	public void testConstructor() {
136	>	PublicReentrantLock lock;
137	>
138	>	lock = new PublicReentrantLock();
139	>	assertFalse(lock.isFair());
140	>	assertNotLocked(lock);
141	>
142	>	lock = new PublicReentrantLock(true);
143	>	assertTrue(lock.isFair());
144	>	assertNotLocked(lock);
145	>
146	>	lock = new PublicReentrantLock(false);
147	>	assertFalse(lock.isFair());
148	>	assertNotLocked(lock);
149	>	}
150	>
151	>	/**
152	>	* locking an unlocked lock succeeds
153	>	*/
154	>	public void testLock() {
155	>	PublicReentrantLock lock = new PublicReentrantLock();
156	>	lock.lock();
157	>	assertLockedBy(lock, Thread.currentThread());
158	>	releaseLock(lock);
159	>	}
160	>
161	>	/**
162	>	* locking an unlocked fair lock succeeds
163	>	*/
164	>	public void testFairLock() {
165	>	PublicReentrantLock lock = new PublicReentrantLock(true);
166	>	lock.lock();
167	>	assertLockedBy(lock, Thread.currentThread());
168	>	releaseLock(lock);
169	>	}
170	>
171	>	/**
172	>	* Unlocking an unlocked lock throws IllegalMonitorStateException
173	>	*/
174	>	public void testUnlock_IllegalMonitorStateException() {
175	>	ReentrantLock lock = new ReentrantLock();
176	>	try {
177	>	lock.unlock();
178	>	shouldThrow();
179	>	} catch (IllegalMonitorStateException success) {}
180	>	}
181	>
182	>	/**
183	>	* tryLock on an unlocked lock succeeds
184	>	*/
185	>	public void testTryLock() {
186	>	PublicReentrantLock lock = new PublicReentrantLock();
187	>	assertTrue(lock.tryLock());
188	>	assertLockedBy(lock, Thread.currentThread());
189	>	releaseLock(lock);
190		}
191
192	<
192	>	/**
193	>	* hasQueuedThreads reports whether there are waiting threads
194	>	*/
195	>	public void testHasQueuedThreads() throws InterruptedException {
196	>	final PublicReentrantLock lock = new PublicReentrantLock();
197	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
198	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
199	>	assertFalse(lock.hasQueuedThreads());
200	>	lock.lock();
201	>	assertFalse(lock.hasQueuedThreads());
202	>	t1.start();
203	>	waitForQueuedThread(lock, t1);
204	>	assertTrue(lock.hasQueuedThreads());
205	>	t2.start();
206	>	waitForQueuedThread(lock, t2);
207	>	assertTrue(lock.hasQueuedThreads());
208	>	t1.interrupt();
209	>	awaitTermination(t1);
210	>	assertTrue(lock.hasQueuedThreads());
211	>	lock.unlock();
212	>	awaitTermination(t2);
213	>	assertFalse(lock.hasQueuedThreads());
214	>	}
215	>
216	>	/**
217	>	* getQueueLength reports number of waiting threads
218	>	*/
219	>	public void testGetQueueLength() throws InterruptedException {
220	>	final PublicReentrantLock lock = new PublicReentrantLock();
221	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
222	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
223	>	assertEquals(0, lock.getQueueLength());
224	>	lock.lock();
225	>	t1.start();
226	>	waitForQueuedThread(lock, t1);
227	>	assertEquals(1, lock.getQueueLength());
228	>	t2.start();
229	>	waitForQueuedThread(lock, t2);
230	>	assertEquals(2, lock.getQueueLength());
231	>	t1.interrupt();
232	>	awaitTermination(t1);
233	>	assertEquals(1, lock.getQueueLength());
234	>	lock.unlock();
235	>	awaitTermination(t2);
236	>	assertEquals(0, lock.getQueueLength());
237	>	}
238	>
239	>	/**
240	>	* getQueueLength reports number of waiting threads
241	>	*/
242	>	public void testGetQueueLength_fair() throws InterruptedException {
243	>	final PublicReentrantLock lock = new PublicReentrantLock(true);
244	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
245	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
246	>	assertEquals(0, lock.getQueueLength());
247	>	lock.lock();
248	>	t1.start();
249	>	waitForQueuedThread(lock, t1);
250	>	assertEquals(1, lock.getQueueLength());
251	>	t2.start();
252	>	waitForQueuedThread(lock, t2);
253	>	assertEquals(2, lock.getQueueLength());
254	>	t1.interrupt();
255	>	awaitTermination(t1);
256	>	assertEquals(1, lock.getQueueLength());
257	>	lock.unlock();
258	>	awaitTermination(t2);
259	>	assertEquals(0, lock.getQueueLength());
260	>	}
261	>
262	>	/**
263	>	* hasQueuedThread(null) throws NPE
264	>	*/
265	>	public void testHasQueuedThreadNPE() {
266	>	final ReentrantLock lock = new ReentrantLock();
267	>	try {
268	>	lock.hasQueuedThread(null);
269	>	shouldThrow();
270	>	} catch (NullPointerException success) {}
271	>	}
272	>
273	>	/**
274	>	* hasQueuedThread reports whether a thread is queued.
275	>	*/
276	>	public void testHasQueuedThread() throws InterruptedException {
277	>	final PublicReentrantLock lock = new PublicReentrantLock();
278	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
279	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
280	>	assertFalse(lock.hasQueuedThread(t1));
281	>	assertFalse(lock.hasQueuedThread(t2));
282	>	lock.lock();
283	>	t1.start();
284	>	waitForQueuedThread(lock, t1);
285	>	assertTrue(lock.hasQueuedThread(t1));
286	>	assertFalse(lock.hasQueuedThread(t2));
287	>	t2.start();
288	>	waitForQueuedThread(lock, t2);
289	>	assertTrue(lock.hasQueuedThread(t1));
290	>	assertTrue(lock.hasQueuedThread(t2));
291	>	t1.interrupt();
292	>	awaitTermination(t1);
293	>	assertFalse(lock.hasQueuedThread(t1));
294	>	assertTrue(lock.hasQueuedThread(t2));
295	>	lock.unlock();
296	>	awaitTermination(t2);
297	>	assertFalse(lock.hasQueuedThread(t1));
298	>	assertFalse(lock.hasQueuedThread(t2));
299	>	}
300	>
301	>	/**
302	>	* getQueuedThreads includes waiting threads
303	>	*/
304	>	public void testGetQueuedThreads() throws InterruptedException {
305	>	final PublicReentrantLock lock = new PublicReentrantLock();
306	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
307	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
308	>	assertTrue(lock.getQueuedThreads().isEmpty());
309	>	lock.lock();
310	>	assertTrue(lock.getQueuedThreads().isEmpty());
311	>	t1.start();
312	>	waitForQueuedThread(lock, t1);
313	>	assertEquals(1, lock.getQueuedThreads().size());
314	>	assertTrue(lock.getQueuedThreads().contains(t1));
315	>	t2.start();
316	>	waitForQueuedThread(lock, t2);
317	>	assertEquals(2, lock.getQueuedThreads().size());
318	>	assertTrue(lock.getQueuedThreads().contains(t1));
319	>	assertTrue(lock.getQueuedThreads().contains(t2));
320	>	t1.interrupt();
321	>	awaitTermination(t1);
322	>	assertFalse(lock.getQueuedThreads().contains(t1));
323	>	assertTrue(lock.getQueuedThreads().contains(t2));
324	>	assertEquals(1, lock.getQueuedThreads().size());
325	>	lock.unlock();
326	>	awaitTermination(t2);
327	>	assertTrue(lock.getQueuedThreads().isEmpty());
328	>	}
329	>
330	>	/**
331	>	* timed tryLock is interruptible.
332	>	*/
333	>	public void testTryLock_Interrupted() throws InterruptedException {
334	>	final PublicReentrantLock lock = new PublicReentrantLock();
335	>	lock.lock();
336	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
337	>	public void realRun() throws InterruptedException {
338	>	lock.tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
339	>	}});
340	>
341	>	waitForQueuedThread(lock, t);
342	>	t.interrupt();
343	>	awaitTermination(t);
344	>	releaseLock(lock);
345	>	}
346	>
347	>	/**
348	>	* tryLock on a locked lock fails
349	>	*/
350	>	public void testTryLockWhenLocked() throws InterruptedException {
351	>	final PublicReentrantLock lock = new PublicReentrantLock();
352	>	lock.lock();
353	>	Thread t = newStartedThread(new CheckedRunnable() {
354	>	public void realRun() {
355	>	assertFalse(lock.tryLock());
356	>	}});
357	>
358	>	awaitTermination(t);
359	>	releaseLock(lock);
360	>	}
361	>
362	>	/**
363	>	* Timed tryLock on a locked lock times out
364	>	*/
365	>	public void testTryLock_Timeout() throws InterruptedException {
366	>	final PublicReentrantLock lock = new PublicReentrantLock();
367	>	lock.lock();
368	>	Thread t = newStartedThread(new CheckedRunnable() {
369	>	public void realRun() throws InterruptedException {
370	>	long startTime = System.nanoTime();
371	>	long timeoutMillis = 10;
372	>	assertFalse(lock.tryLock(timeoutMillis, MILLISECONDS));
373	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
374	>	}});
375	>
376	>	awaitTermination(t);
377	>	releaseLock(lock);
378	>	}
379	>
380	>	/**
381	>	* getHoldCount returns number of recursive holds
382	>	*/
383		public void testGetHoldCount() {
384	<	ReentrantLock lock = new ReentrantLock();
385	<	for(int i = 1; i <= ReentrantLockTest.HOLD_COUNT_TEST_LIMIT;i++) {
386	<	lock.lock();
387	<	assertEquals(i,lock.getHoldCount());
388	<	}
389	<	for(int i = ReentrantLockTest.HOLD_COUNT_TEST_LIMIT; i > 0; i--) {
390	<	lock.unlock();
391	<	assertEquals(i-1,lock.getHoldCount());
392	<	}
393	<	}
394	<
395	<
396	<
397	<
398	<	public void testIsLocked() {
399	<	final ReentrantLock lock = new ReentrantLock();
400	<	lock.lock();
401	<	assertTrue(lock.isLocked());
402	<	lock.unlock();
403	<	assertFalse(lock.isLocked());
404	<	Thread t = new Thread(new Runnable() {
405	<	public void run() {
406	<	lock.lock();
407	<	try {
408	<	Thread.sleep(SHORT_DELAY_MS * 2);
409	<	}
410	<	catch(Exception e) {}
411	<	lock.unlock();
412	<	}
413	<	});
414	<	try{
415	<	t.start();
416	<	Thread.sleep(SHORT_DELAY_MS);
417	<	assertTrue(lock.isLocked());
418	<	t.join();
419	<	assertFalse(lock.isLocked());
420	<	} catch(Exception e){
421	<	fail("unexpected exception");
422	<	}
423	<
424	<	}
425	<
426	<	/*
427	<	* current thread locks interruptibly the thread
428	<	* another thread tries to aquire the lock and blocks
429	<	* on the call. interrupt the attempted aquireLock
430	<	* assert that the first lock() call actually locked the lock
431	<	* assert that the current thread is the one holding the lock
432	<	*/
433	<
434	<	public void testLockedInterruptibly() {
435	<	final ReentrantLock lock = new ReentrantLock();
436	<	try {lock.lockInterruptibly();} catch(Exception e) {}
437	<	Thread t = new Thread(new Runnable() {
438	<	public void run() {
439	<	try {
440	<	lock.lockInterruptibly();
441	<	fail("Failed to generate an Interrupted Exception");
442	<	}
443	<	catch(InterruptedException e) {}
444	<	}
445	<	});
446	<	t.start();
447	<	t.interrupt();
448	<	assertTrue(lock.isLocked());
449	<	assertTrue(lock.isHeldByCurrentThread());
384	>	ReentrantLock lock = new ReentrantLock();
385	>	for (int i = 1; i <= SIZE; i++) {
386	>	lock.lock();
387	>	assertEquals(i, lock.getHoldCount());
388	>	}
389	>	for (int i = SIZE; i > 0; i--) {
390	>	lock.unlock();
391	>	assertEquals(i-1, lock.getHoldCount());
392	>	}
393	>	}
394	>
395	>	/**
396	>	* isLocked is true when locked and false when not
397	>	*/
398	>	public void testIsLocked() throws Exception {
399	>	final ReentrantLock lock = new ReentrantLock();
400	>	assertFalse(lock.isLocked());
401	>	lock.lock();
402	>	assertTrue(lock.isLocked());
403	>	lock.lock();
404	>	assertTrue(lock.isLocked());
405	>	lock.unlock();
406	>	assertTrue(lock.isLocked());
407	>	lock.unlock();
408	>	assertFalse(lock.isLocked());
409	>	final CyclicBarrier barrier = new CyclicBarrier(2);
410	>	Thread t = newStartedThread(new CheckedRunnable() {
411	>	public void realRun() throws Exception {
412	>	lock.lock();
413	>	assertTrue(lock.isLocked());
414	>	barrier.await();
415	>	barrier.await();
416	>	lock.unlock();
417	>	}});
418	>
419	>	barrier.await();
420	>	assertTrue(lock.isLocked());
421	>	barrier.await();
422	>	awaitTermination(t);
423	>	assertFalse(lock.isLocked());
424	>	}
425	>
426	>	/**
427	>	* lockInterruptibly is interruptible.
428	>	*/
429	>	public void testLockInterruptibly_Interrupted() throws InterruptedException {
430	>	final PublicReentrantLock lock = new PublicReentrantLock();
431	>	lock.lock();
432	>	Thread t = newStartedThread(new InterruptedLockRunnable(lock));
433	>	waitForQueuedThread(lock, t);
434	>	t.interrupt();
435	>	awaitTermination(t);
436	>	releaseLock(lock);
437	>	}
438	>
439	>	/**
440	>	* lockInterruptibly succeeds when unlocked, else is interruptible
441	>	*/
442	>	public void testLockInterruptibly_Interrupted2() throws InterruptedException {
443	>	final PublicReentrantLock lock = new PublicReentrantLock();
444	>	lock.lockInterruptibly();
445	>	Thread t = newStartedThread(new InterruptedLockRunnable(lock));
446	>	waitForQueuedThread(lock, t);
447	>	t.interrupt();
448	>	assertTrue(lock.isLocked());
449	>	assertTrue(lock.isHeldByCurrentThread());
450	>	awaitTermination(t);
451	>	releaseLock(lock);
452	>	}
453	>
454	>	/**
455	>	* Calling await without holding lock throws IllegalMonitorStateException
456	>	*/
457	>	public void testAwait_IllegalMonitor() throws InterruptedException {
458	>	final ReentrantLock lock = new ReentrantLock();
459	>	final Condition c = lock.newCondition();
460	>	try {
461	>	c.await();
462	>	shouldThrow();
463	>	} catch (IllegalMonitorStateException success) {}
464	>	try {
465	>	c.await(LONG_DELAY_MS, MILLISECONDS);
466	>	shouldThrow();
467	>	} catch (IllegalMonitorStateException success) {}
468	>	try {
469	>	c.awaitNanos(100);
470	>	shouldThrow();
471	>	} catch (IllegalMonitorStateException success) {}
472	>	try {
473	>	c.awaitUninterruptibly();
474	>	shouldThrow();
475	>	} catch (IllegalMonitorStateException success) {}
476	>	}
477	>
478	>	/**
479	>	* Calling signal without holding lock throws IllegalMonitorStateException
480	>	*/
481	>	public void testSignal_IllegalMonitor() {
482	>	final ReentrantLock lock = new ReentrantLock();
483	>	final Condition c = lock.newCondition();
484	>	try {
485	>	c.signal();
486	>	shouldThrow();
487	>	} catch (IllegalMonitorStateException success) {}
488		}
155	–
489
490	+	/**
491	+	* awaitNanos without a signal times out
492	+	*/
493	+	public void testAwaitNanos_Timeout() throws InterruptedException {
494	+	final ReentrantLock lock = new ReentrantLock();
495	+	final Condition c = lock.newCondition();
496	+	lock.lock();
497	+	long startTime = System.nanoTime();
498	+	long timeoutMillis = 10;
499	+	long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis);
500	+	long nanosRemaining = c.awaitNanos(timeoutNanos);
501	+	assertTrue(nanosRemaining <= 0);
502	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
503	+	lock.unlock();
504	+	}
505	+
506	+	/**
507	+	* timed await without a signal times out
508	+	*/
509	+	public void testAwait_Timeout() throws InterruptedException {
510	+	final ReentrantLock lock = new ReentrantLock();
511	+	final Condition c = lock.newCondition();
512	+	lock.lock();
513	+	long startTime = System.nanoTime();
514	+	long timeoutMillis = 10;
515	+	assertFalse(c.await(timeoutMillis, MILLISECONDS));
516	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
517	+	lock.unlock();
518	+	}
519	+
520	+	/**
521	+	* awaitUntil without a signal times out
522	+	*/
523	+	public void testAwaitUntil_Timeout() throws InterruptedException {
524	+	final ReentrantLock lock = new ReentrantLock();
525	+	final Condition c = lock.newCondition();
526	+	lock.lock();
527	+	long startTime = System.nanoTime();
528	+	long timeoutMillis = 10;
529	+	java.util.Date d = new java.util.Date();
530	+	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + timeoutMillis)));
531	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
532	+	lock.unlock();
533	+	}
534	+
535	+	/**
536	+	* await returns when signalled
537	+	*/
538	+	public void testAwait() throws InterruptedException {
539	+	final PublicReentrantLock lock = new PublicReentrantLock();
540	+	final Condition c = lock.newCondition();
541	+	final CountDownLatch locked = new CountDownLatch(1);
542	+	Thread t = newStartedThread(new CheckedRunnable() {
543	+	public void realRun() throws InterruptedException {
544	+	lock.lock();
545	+	locked.countDown();
546	+	c.await();
547	+	lock.unlock();
548	+	}});
549	+
550	+	locked.await();
551	+	lock.lock();
552	+	assertHasWaiters(lock, c, t);
553	+	c.signal();
554	+	assertHasNoWaiters(lock, c);
555	+	assertTrue(t.isAlive());
556	+	lock.unlock();
557	+	awaitTermination(t);
558	+	}
559	+
560	+	/**
561	+	* hasWaiters throws NPE if null
562	+	*/
563	+	public void testHasWaitersNPE() {
564	+	final ReentrantLock lock = new ReentrantLock();
565	+	try {
566	+	lock.hasWaiters(null);
567	+	shouldThrow();
568	+	} catch (NullPointerException success) {}
569	+	}
570	+
571	+	/**
572	+	* getWaitQueueLength throws NPE if null
573	+	*/
574	+	public void testGetWaitQueueLengthNPE() {
575	+	final ReentrantLock lock = new ReentrantLock();
576	+	try {
577	+	lock.getWaitQueueLength(null);
578	+	shouldThrow();
579	+	} catch (NullPointerException success) {}
580	+	}
581	+
582	+	/**
583	+	* getWaitingThreads throws NPE if null
584	+	*/
585	+	public void testGetWaitingThreadsNPE() {
586	+	final PublicReentrantLock lock = new PublicReentrantLock();
587	+	try {
588	+	lock.getWaitingThreads(null);
589	+	shouldThrow();
590	+	} catch (NullPointerException success) {}
591	+	}
592	+
593	+	/**
594	+	* hasWaiters throws IllegalArgumentException if not owned
595	+	*/
596	+	public void testHasWaitersIAE() {
597	+	final ReentrantLock lock = new ReentrantLock();
598	+	final Condition c = lock.newCondition();
599	+	final ReentrantLock lock2 = new ReentrantLock();
600	+	try {
601	+	lock2.hasWaiters(c);
602	+	shouldThrow();
603	+	} catch (IllegalArgumentException success) {}
604	+	}
605	+
606	+	/**
607	+	* hasWaiters throws IllegalMonitorStateException if not locked
608	+	*/
609	+	public void testHasWaitersIMSE() {
610	+	final ReentrantLock lock = new ReentrantLock();
611	+	final Condition c = lock.newCondition();
612	+	try {
613	+	lock.hasWaiters(c);
614	+	shouldThrow();
615	+	} catch (IllegalMonitorStateException success) {}
616	+	}
617	+
618	+	/**
619	+	* getWaitQueueLength throws IllegalArgumentException if not owned
620	+	*/
621	+	public void testGetWaitQueueLengthIAE() {
622	+	final ReentrantLock lock = new ReentrantLock();
623	+	final Condition c = lock.newCondition();
624	+	final ReentrantLock lock2 = new ReentrantLock();
625	+	try {
626	+	lock2.getWaitQueueLength(c);
627	+	shouldThrow();
628	+	} catch (IllegalArgumentException success) {}
629	+	}
630	+
631	+	/**
632	+	* getWaitQueueLength throws IllegalMonitorStateException if not locked
633	+	*/
634	+	public void testGetWaitQueueLengthIMSE() {
635	+	final ReentrantLock lock = new ReentrantLock();
636	+	final Condition c = lock.newCondition();
637	+	try {
638	+	lock.getWaitQueueLength(c);
639	+	shouldThrow();
640	+	} catch (IllegalMonitorStateException success) {}
641	+	}
642	+
643	+	/**
644	+	* getWaitingThreads throws IllegalArgumentException if not owned
645	+	*/
646	+	public void testGetWaitingThreadsIAE() {
647	+	final PublicReentrantLock lock = new PublicReentrantLock();
648	+	final Condition c = lock.newCondition();
649	+	final PublicReentrantLock lock2 = new PublicReentrantLock();
650	+	try {
651	+	lock2.getWaitingThreads(c);
652	+	shouldThrow();
653	+	} catch (IllegalArgumentException success) {}
654	+	}
655	+
656	+	/**
657	+	* getWaitingThreads throws IllegalMonitorStateException if not locked
658	+	*/
659	+	public void testGetWaitingThreadsIMSE() {
660	+	final PublicReentrantLock lock = new PublicReentrantLock();
661	+	final Condition c = lock.newCondition();
662	+	try {
663	+	lock.getWaitingThreads(c);
664	+	shouldThrow();
665	+	} catch (IllegalMonitorStateException success) {}
666	+	}
667	+
668	+	/**
669	+	* hasWaiters returns true when a thread is waiting, else false
670	+	*/
671	+	public void testHasWaiters() throws InterruptedException {
672	+	final PublicReentrantLock lock = new PublicReentrantLock();
673	+	final Condition c = lock.newCondition();
674	+	final CountDownLatch locked = new CountDownLatch(1);
675	+	Thread t = newStartedThread(new CheckedRunnable() {
676	+	public void realRun() throws InterruptedException {
677	+	lock.lock();
678	+	assertHasNoWaiters(lock, c);
679	+	assertFalse(lock.hasWaiters(c));
680	+	locked.countDown();
681	+	c.await();
682	+	assertHasNoWaiters(lock, c);
683	+	assertFalse(lock.hasWaiters(c));
684	+	lock.unlock();
685	+	}});
686	+
687	+	locked.await();
688	+	lock.lock();
689	+	assertHasWaiters(lock, c, t);
690	+	assertTrue(lock.hasWaiters(c));
691	+	c.signal();
692	+	assertHasNoWaiters(lock, c);
693	+	assertFalse(lock.hasWaiters(c));
694	+	lock.unlock();
695	+	awaitTermination(t);
696	+	assertHasNoWaiters(lock, c);
697	+	}
698	+
699	+	/**
700	+	* getWaitQueueLength returns number of waiting threads
701	+	*/
702	+	public void testGetWaitQueueLength() throws InterruptedException {
703	+	final PublicReentrantLock lock = new PublicReentrantLock();
704	+	final Condition c = lock.newCondition();
705	+	final CountDownLatch locked1 = new CountDownLatch(1);
706	+	final CountDownLatch locked2 = new CountDownLatch(1);
707	+	Thread t1 = new Thread(new CheckedRunnable() {
708	+	public void realRun() throws InterruptedException {
709	+	lock.lock();
710	+	assertFalse(lock.hasWaiters(c));
711	+	assertEquals(0, lock.getWaitQueueLength(c));
712	+	locked1.countDown();
713	+	c.await();
714	+	lock.unlock();
715	+	}});
716	+
717	+	Thread t2 = new Thread(new CheckedRunnable() {
718	+	public void realRun() throws InterruptedException {
719	+	lock.lock();
720	+	assertTrue(lock.hasWaiters(c));
721	+	assertEquals(1, lock.getWaitQueueLength(c));
722	+	locked2.countDown();
723	+	c.await();
724	+	lock.unlock();
725	+	}});
726	+
727	+	lock.lock();
728	+	assertEquals(0, lock.getWaitQueueLength(c));
729	+	lock.unlock();
730	+
731	+	t1.start();
732	+	locked1.await();
733	+
734	+	lock.lock();
735	+	assertHasWaiters(lock, c, t1);
736	+	assertEquals(1, lock.getWaitQueueLength(c));
737	+	lock.unlock();
738	+
739	+	t2.start();
740	+	locked2.await();
741	+
742	+	lock.lock();
743	+	assertHasWaiters(lock, c, t1, t2);
744	+	assertEquals(2, lock.getWaitQueueLength(c));
745	+	c.signalAll();
746	+	assertHasNoWaiters(lock, c);
747	+	lock.unlock();
748	+
749	+	awaitTermination(t1);
750	+	awaitTermination(t2);
751	+
752	+	assertHasNoWaiters(lock, c);
753	+	}
754	+
755	+	/**
756	+	* getWaitingThreads returns only and all waiting threads
757	+	*/
758	+	public void testGetWaitingThreads() throws InterruptedException {
759	+	final PublicReentrantLock lock = new PublicReentrantLock();
760	+	final Condition c = lock.newCondition();
761	+	final CountDownLatch locked1 = new CountDownLatch(1);
762	+	final CountDownLatch locked2 = new CountDownLatch(1);
763	+	Thread t1 = new Thread(new CheckedRunnable() {
764	+	public void realRun() throws InterruptedException {
765	+	lock.lock();
766	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
767	+	locked1.countDown();
768	+	c.await();
769	+	lock.unlock();
770	+	}});
771	+
772	+	Thread t2 = new Thread(new CheckedRunnable() {
773	+	public void realRun() throws InterruptedException {
774	+	lock.lock();
775	+	assertFalse(lock.getWaitingThreads(c).isEmpty());
776	+	locked2.countDown();
777	+	c.await();
778	+	lock.unlock();
779	+	}});
780	+
781	+	lock.lock();
782	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
783	+	lock.unlock();
784	+
785	+	t1.start();
786	+	locked1.await();
787	+
788	+	lock.lock();
789	+	assertHasWaiters(lock, c, t1);
790	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
791	+	assertFalse(lock.getWaitingThreads(c).contains(t2));
792	+	assertEquals(1, lock.getWaitingThreads(c).size());
793	+	lock.unlock();
794	+
795	+	t2.start();
796	+	locked2.await();
797	+
798	+	lock.lock();
799	+	assertHasWaiters(lock, c, t1, t2);
800	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
801	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
802	+	assertEquals(2, lock.getWaitingThreads(c).size());
803	+	c.signalAll();
804	+	assertHasNoWaiters(lock, c);
805	+	lock.unlock();
806	+
807	+	awaitTermination(t1);
808	+	awaitTermination(t2);
809	+
810	+	assertHasNoWaiters(lock, c);
811	+	}
812	+
813	+	/**
814	+	* awaitUninterruptibly doesn't abort on interrupt
815	+	*/
816	+	public void testAwaitUninterruptibly() throws InterruptedException {
817	+	final ReentrantLock lock = new ReentrantLock();
818	+	final Condition c = lock.newCondition();
819	+	final CountDownLatch locked = new CountDownLatch(1);
820	+	Thread t = newStartedThread(new CheckedRunnable() {
821	+	public void realRun() {
822	+	lock.lock();
823	+	locked.countDown();
824	+	c.awaitUninterruptibly();
825	+	assertTrue(Thread.interrupted());
826	+	lock.unlock();
827	+	}});
828	+
829	+	locked.await();
830	+	lock.lock();
831	+	lock.unlock();
832	+	t.interrupt();
833	+	long timeoutMillis = 10;
834	+	assertThreadJoinTimesOut(t, timeoutMillis);
835	+	lock.lock();
836	+	c.signal();
837	+	lock.unlock();
838	+	awaitTermination(t);
839	+	}
840	+
841	+	/**
842	+	* await is interruptible
843	+	*/
844	+	public void testAwait_Interrupt() throws InterruptedException {
845	+	final PublicReentrantLock lock = new PublicReentrantLock();
846	+	final Condition c = lock.newCondition();
847	+	final CountDownLatch locked = new CountDownLatch(1);
848	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
849	+	public void realRun() throws InterruptedException {
850	+	lock.lock();
851	+	assertTrue(lock.isLocked());
852	+	assertTrue(lock.isHeldByCurrentThread());
853	+	assertHasNoWaiters(lock, c);
854	+	locked.countDown();
855	+	try {
856	+	c.await();
857	+	} finally {
858	+	assertTrue(lock.isLocked());
859	+	assertTrue(lock.isHeldByCurrentThread());
860	+	assertHasNoWaiters(lock, c);
861	+	lock.unlock();
862	+	assertFalse(Thread.interrupted());
863	+	}
864	+	}});
865	+
866	+	locked.await();
867	+	assertHasWaiters(lock, c, t);
868	+	t.interrupt();
869	+	awaitTermination(t);
870	+	assertFalse(lock.isLocked());
871	+	}
872	+
873	+	/**
874	+	* awaitNanos is interruptible
875	+	*/
876	+	public void testAwaitNanos_Interrupt() throws InterruptedException {
877	+	final PublicReentrantLock lock = new PublicReentrantLock();
878	+	final Condition c = lock.newCondition();
879	+	final CountDownLatch locked = new CountDownLatch(1);
880	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
881	+	public void realRun() throws InterruptedException {
882	+	lock.lock();
883	+	assertTrue(lock.isLocked());
884	+	assertTrue(lock.isHeldByCurrentThread());
885	+	assertHasNoWaiters(lock, c);
886	+	locked.countDown();
887	+	try {
888	+	c.awaitNanos(MILLISECONDS.toNanos(2 * LONG_DELAY_MS));
889	+	} finally {
890	+	assertTrue(lock.isLocked());
891	+	assertTrue(lock.isHeldByCurrentThread());
892	+	assertHasNoWaiters(lock, c);
893	+	lock.unlock();
894	+	assertFalse(Thread.interrupted());
895	+	}
896	+	}});
897	+
898	+	locked.await();
899	+	assertHasWaiters(lock, c, t);
900	+	t.interrupt();
901	+	awaitTermination(t);
902	+	assertFalse(lock.isLocked());
903	+	}
904	+
905	+	/**
906	+	* awaitUntil is interruptible
907	+	*/
908	+	public void testAwaitUntil_Interrupt() throws InterruptedException {
909	+	final PublicReentrantLock lock = new PublicReentrantLock();
910	+	final Condition c = lock.newCondition();
911	+	final CountDownLatch locked = new CountDownLatch(1);
912	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
913	+	public void realRun() throws InterruptedException {
914	+	lock.lock();
915	+	assertTrue(lock.isLocked());
916	+	assertTrue(lock.isHeldByCurrentThread());
917	+	assertHasNoWaiters(lock, c);
918	+	locked.countDown();
919	+	java.util.Date d = new java.util.Date();
920	+	try {
921	+	c.awaitUntil(new java.util.Date(d.getTime() + 2 * LONG_DELAY_MS));
922	+	} finally {
923	+	assertTrue(lock.isLocked());
924	+	assertTrue(lock.isHeldByCurrentThread());
925	+	assertHasNoWaiters(lock, c);
926	+	lock.unlock();
927	+	assertFalse(Thread.interrupted());
928	+	}
929	+	}});
930	+
931	+	locked.await();
932	+	assertHasWaiters(lock, c, t);
933	+	t.interrupt();
934	+	awaitTermination(t);
935	+	assertFalse(lock.isLocked());
936	+	}
937	+
938	+	/**
939	+	* signalAll wakes up all threads
940	+	*/
941	+	public void testSignalAll() throws InterruptedException {
942	+	final PublicReentrantLock lock = new PublicReentrantLock();
943	+	final Condition c = lock.newCondition();
944	+	final CountDownLatch locked = new CountDownLatch(2);
945	+	Thread t1 = newStartedThread(new CheckedRunnable() {
946	+	public void realRun() throws InterruptedException {
947	+	lock.lock();
948	+	locked.countDown();
949	+	c.await();
950	+	lock.unlock();
951	+	}});
952	+
953	+	Thread t2 = newStartedThread(new CheckedRunnable() {
954	+	public void realRun() throws InterruptedException {
955	+	lock.lock();
956	+	locked.countDown();
957	+	c.await();
958	+	lock.unlock();
959	+	}});
960	+
961	+	locked.await();
962	+	lock.lock();
963	+	assertHasWaiters(lock, c, t1, t2);
964	+	c.signalAll();
965	+	assertHasNoWaiters(lock, c);
966	+	lock.unlock();
967	+	awaitTermination(t1);
968	+	awaitTermination(t2);
969	+	}
970	+
971	+	/**
972	+	* await after multiple reentrant locking preserves lock count
973	+	*/
974	+	public void testAwaitLockCount() throws InterruptedException {
975	+	final PublicReentrantLock lock = new PublicReentrantLock();
976	+	final Condition c = lock.newCondition();
977	+	final CountDownLatch locked = new CountDownLatch(2);
978	+	Thread t1 = newStartedThread(new CheckedRunnable() {
979	+	public void realRun() throws InterruptedException {
980	+	lock.lock();
981	+	assertLockedBy(lock, Thread.currentThread());
982	+	assertEquals(1, lock.getHoldCount());
983	+	locked.countDown();
984	+	c.await();
985	+	assertLockedBy(lock, Thread.currentThread());
986	+	assertEquals(1, lock.getHoldCount());
987	+	lock.unlock();
988	+	}});
989	+
990	+	Thread t2 = newStartedThread(new CheckedRunnable() {
991	+	public void realRun() throws InterruptedException {
992	+	lock.lock();
993	+	lock.lock();
994	+	assertLockedBy(lock, Thread.currentThread());
995	+	assertEquals(2, lock.getHoldCount());
996	+	locked.countDown();
997	+	c.await();
998	+	assertLockedBy(lock, Thread.currentThread());
999	+	assertEquals(2, lock.getHoldCount());
1000	+	lock.unlock();
1001	+	lock.unlock();
1002	+	}});
1003	+
1004	+	locked.await();
1005	+	lock.lock();
1006	+	assertHasWaiters(lock, c, t1, t2);
1007	+	assertEquals(1, lock.getHoldCount());
1008	+	c.signalAll();
1009	+	assertHasNoWaiters(lock, c);
1010	+	lock.unlock();
1011	+	awaitTermination(t1);
1012	+	awaitTermination(t2);
1013	+	}
1014	+
1015	+	/**
1016	+	* A serialized lock deserializes as unlocked
1017	+	*/
1018	+	public void testSerialization() throws Exception {
1019	+	ReentrantLock l = new ReentrantLock();
1020	+	l.lock();
1021	+	l.unlock();
1022	+
1023	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1024	+	ObjectOutputStream out =
1025	+	new ObjectOutputStream(new BufferedOutputStream(bout));
1026	+	out.writeObject(l);
1027	+	out.close();
1028	+
1029	+	ByteArrayInputStream bin =
1030	+	new ByteArrayInputStream(bout.toByteArray());
1031	+	ObjectInputStream in =
1032	+	new ObjectInputStream(new BufferedInputStream(bin));
1033	+	ReentrantLock r = (ReentrantLock) in.readObject();
1034	+	r.lock();
1035	+	r.unlock();
1036	+	}
1037	+
1038	+	/**
1039	+	* toString indicates current lock state
1040	+	*/
1041	+	public void testToString() {
1042	+	ReentrantLock lock = new ReentrantLock();
1043	+	String us = lock.toString();
1044	+	assertTrue(us.indexOf("Unlocked") >= 0);
1045	+	lock.lock();
1046	+	String ls = lock.toString();
1047	+	assertTrue(ls.indexOf("Locked") >= 0);
1048	+	}
1049		}

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