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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 1.42 by jsr166, Sat May 7 03:12:48 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	>	/**
37	>	* A runnable calling lockInterruptibly that expects to be
38	>	* interrupted
39	>	*/
40	>	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
41	>	final ReentrantLock lock;
42	>	InterruptedLockRunnable(ReentrantLock l) { lock = l; }
43	>	public void realRun() throws InterruptedException {
44	>	lock.lockInterruptibly();
45	>	}
46	>	}
47	>
48	>	/**
49	>	* Subclass to expose protected methods
50	>	*/
51	>	static class PublicReentrantLock extends ReentrantLock {
52	>	PublicReentrantLock() { super(); }
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	<	private static long SHORT_DELAY_MS = 100;
62	<	private static long MEDIUM_DELAY_MS = 1000;
63	<	private static long LONG_DELAY_MS = 10000;
64	<
65	<	/*
66	<	* Unlocks an unlocked lock, throws Illegal Monitor State
67	<	*
68	<	*/
69	<
70	<	public void testIllegalMonitorStateException(){
71	<	ReentrantLock rl = new ReentrantLock();
72	<	try{
73	<	rl.unlock();
74	<	fail("Should of thown Illegal Monitor State Exception");
75	<
76	<	}catch(IllegalMonitorStateException sucess){}
77	<
78	<
79	<	}
80	<
81	<	/*
82	<	* makes a lock, locks it, tries to aquire the lock in another thread
83	<	* interrupts that thread and waits for an interrupted Exception to
84	<	* be thrown.
85	<	*/
86	<
87	<	public void testInterruptedException(){
88	<	final ReentrantLock lock = new ReentrantLock();
51	<	lock.lock();
52	<	Thread t = new Thread(new Runnable() {
53	<	public void run(){
54	<	try{
55	<	lock.lockInterruptibly();
56	<	fail("should throw");
57	<	}catch(InterruptedException sucess){}
58	<	}
59	<	});
60	<	t.start();
61	<	t.interrupt();
62	<	lock.unlock();
63	<	}
64	<
65	<	/*
66	<	* tests for interrupted exception on a timed wait
67	<	*
68	<	*/
69	<
70	<
71	<	public void testInterruptedException2(){
72	<	final ReentrantLock lock = new ReentrantLock();
73	<	lock.lock();
74	<	Thread t = new Thread(new Runnable() {
75	<	public void run(){
76	<	try{
77	<	lock.tryLock(1000,TimeUnit.MILLISECONDS);
78	<	fail("should throw");
79	<	}catch(InterruptedException sucess){}
80	<	}
81	<	});
82	<	t.start();
83	<	t.interrupt();
61	>	/**
62	>	* Constructor sets given fairness
63	>	*/
64	>	public void testConstructor() {
65	>	assertFalse(new ReentrantLock().isFair());
66	>	assertFalse(new ReentrantLock(false).isFair());
67	>	assertTrue(new ReentrantLock(true).isFair());
68	>	}
69	>
70	>	/**
71	>	* locking an unlocked lock succeeds
72	>	*/
73	>	public void testLock() {
74	>	ReentrantLock rl = new ReentrantLock();
75	>	rl.lock();
76	>	assertTrue(rl.isLocked());
77	>	rl.unlock();
78	>	assertFalse(rl.isLocked());
79	>	}
80	>
81	>	/**
82	>	* locking an unlocked fair lock succeeds
83	>	*/
84	>	public void testFairLock() {
85	>	ReentrantLock rl = new ReentrantLock(true);
86	>	rl.lock();
87	>	assertTrue(rl.isLocked());
88	>	rl.unlock();
89		}
90
91	<
91	>	/**
92	>	* Unlocking an unlocked lock throws IllegalMonitorStateException
93	>	*/
94	>	public void testUnlock_IllegalMonitorStateException() {
95	>	ReentrantLock rl = new ReentrantLock();
96	>	try {
97	>	rl.unlock();
98	>	shouldThrow();
99	>	} catch (IllegalMonitorStateException success) {}
100	>	}
101	>
102	>	/**
103	>	* tryLock on an unlocked lock succeeds
104	>	*/
105	>	public void testTryLock() {
106	>	ReentrantLock rl = new ReentrantLock();
107	>	assertTrue(rl.tryLock());
108	>	assertTrue(rl.isLocked());
109	>	rl.unlock();
110	>	}
111	>
112	>
113	>	/**
114	>	* hasQueuedThreads reports whether there are waiting threads
115	>	*/
116	>	public void testhasQueuedThreads() throws InterruptedException {
117	>	final ReentrantLock lock = new ReentrantLock();
118	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
119	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
120	>	assertFalse(lock.hasQueuedThreads());
121	>	lock.lock();
122	>	t1.start();
123	>	delay(SHORT_DELAY_MS);
124	>	assertTrue(lock.hasQueuedThreads());
125	>	t2.start();
126	>	delay(SHORT_DELAY_MS);
127	>	assertTrue(lock.hasQueuedThreads());
128	>	t1.interrupt();
129	>	delay(SHORT_DELAY_MS);
130	>	assertTrue(lock.hasQueuedThreads());
131	>	lock.unlock();
132	>	delay(SHORT_DELAY_MS);
133	>	assertFalse(lock.hasQueuedThreads());
134	>	awaitTermination(t1);
135	>	awaitTermination(t2);
136	>	}
137	>
138	>	/**
139	>	* getQueueLength reports number of waiting threads
140	>	*/
141	>	public void testGetQueueLength() throws InterruptedException {
142	>	final ReentrantLock lock = new ReentrantLock();
143	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
144	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
145	>	assertEquals(0, lock.getQueueLength());
146	>	lock.lock();
147	>	t1.start();
148	>	delay(SHORT_DELAY_MS);
149	>	assertEquals(1, lock.getQueueLength());
150	>	t2.start();
151	>	delay(SHORT_DELAY_MS);
152	>	assertEquals(2, lock.getQueueLength());
153	>	t1.interrupt();
154	>	delay(SHORT_DELAY_MS);
155	>	assertEquals(1, lock.getQueueLength());
156	>	lock.unlock();
157	>	delay(SHORT_DELAY_MS);
158	>	assertEquals(0, lock.getQueueLength());
159	>	awaitTermination(t1);
160	>	awaitTermination(t2);
161	>	}
162	>
163	>	/**
164	>	* getQueueLength reports number of waiting threads
165	>	*/
166	>	public void testGetQueueLength_fair() throws InterruptedException {
167	>	final ReentrantLock lock = new ReentrantLock(true);
168	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
169	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
170	>	assertEquals(0, lock.getQueueLength());
171	>	lock.lock();
172	>	t1.start();
173	>	delay(SHORT_DELAY_MS);
174	>	assertEquals(1, lock.getQueueLength());
175	>	t2.start();
176	>	delay(SHORT_DELAY_MS);
177	>	assertEquals(2, lock.getQueueLength());
178	>	t1.interrupt();
179	>	delay(SHORT_DELAY_MS);
180	>	assertEquals(1, lock.getQueueLength());
181	>	lock.unlock();
182	>	delay(SHORT_DELAY_MS);
183	>	assertEquals(0, lock.getQueueLength());
184	>	awaitTermination(t1);
185	>	awaitTermination(t2);
186	>	}
187	>
188	>	/**
189	>	* hasQueuedThread(null) throws NPE
190	>	*/
191	>	public void testHasQueuedThreadNPE() {
192	>	final ReentrantLock sync = new ReentrantLock();
193	>	try {
194	>	sync.hasQueuedThread(null);
195	>	shouldThrow();
196	>	} catch (NullPointerException success) {}
197	>	}
198	>
199	>	/**
200	>	* hasQueuedThread reports whether a thread is queued.
201	>	*/
202	>	public void testHasQueuedThread() throws InterruptedException {
203	>	final ReentrantLock sync = new ReentrantLock();
204	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
205	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
206	>	assertFalse(sync.hasQueuedThread(t1));
207	>	assertFalse(sync.hasQueuedThread(t2));
208	>	sync.lock();
209	>	t1.start();
210	>	delay(SHORT_DELAY_MS);
211	>	assertTrue(sync.hasQueuedThread(t1));
212	>	t2.start();
213	>	delay(SHORT_DELAY_MS);
214	>	assertTrue(sync.hasQueuedThread(t1));
215	>	assertTrue(sync.hasQueuedThread(t2));
216	>	t1.interrupt();
217	>	delay(SHORT_DELAY_MS);
218	>	assertFalse(sync.hasQueuedThread(t1));
219	>	assertTrue(sync.hasQueuedThread(t2));
220	>	sync.unlock();
221	>	delay(SHORT_DELAY_MS);
222	>	assertFalse(sync.hasQueuedThread(t1));
223	>	delay(SHORT_DELAY_MS);
224	>	assertFalse(sync.hasQueuedThread(t2));
225	>	awaitTermination(t1);
226	>	awaitTermination(t2);
227	>	}
228	>
229	>
230	>	/**
231	>	* getQueuedThreads includes waiting threads
232	>	*/
233	>	public void testGetQueuedThreads() throws InterruptedException {
234	>	final PublicReentrantLock lock = new PublicReentrantLock();
235	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
236	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
237	>	assertTrue(lock.getQueuedThreads().isEmpty());
238	>	lock.lock();
239	>	assertTrue(lock.getQueuedThreads().isEmpty());
240	>	t1.start();
241	>	delay(SHORT_DELAY_MS);
242	>	assertTrue(lock.getQueuedThreads().contains(t1));
243	>	t2.start();
244	>	delay(SHORT_DELAY_MS);
245	>	assertTrue(lock.getQueuedThreads().contains(t1));
246	>	assertTrue(lock.getQueuedThreads().contains(t2));
247	>	t1.interrupt();
248	>	delay(SHORT_DELAY_MS);
249	>	assertFalse(lock.getQueuedThreads().contains(t1));
250	>	assertTrue(lock.getQueuedThreads().contains(t2));
251	>	lock.unlock();
252	>	delay(SHORT_DELAY_MS);
253	>	assertTrue(lock.getQueuedThreads().isEmpty());
254	>	awaitTermination(t1);
255	>	awaitTermination(t2);
256	>	}
257	>
258	>
259	>	/**
260	>	* timed tryLock is interruptible.
261	>	*/
262	>	public void testInterruptedException2() throws InterruptedException {
263	>	final ReentrantLock lock = new ReentrantLock();
264	>	lock.lock();
265	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
266	>	public void realRun() throws InterruptedException {
267	>	lock.tryLock(MEDIUM_DELAY_MS,MILLISECONDS);
268	>	}});
269	>
270	>	delay(SHORT_DELAY_MS);
271	>	t.interrupt();
272	>	awaitTermination(t);
273	>	}
274	>
275	>
276	>	/**
277	>	* TryLock on a locked lock fails
278	>	*/
279	>	public void testTryLockWhenLocked() throws InterruptedException {
280	>	final ReentrantLock lock = new ReentrantLock();
281	>	lock.lock();
282	>	Thread t = newStartedThread(new CheckedRunnable() {
283	>	public void realRun() {
284	>	assertFalse(lock.tryLock());
285	>	}});
286	>
287	>	awaitTermination(t);
288	>	lock.unlock();
289	>	}
290	>
291	>	/**
292	>	* Timed tryLock on a locked lock times out
293	>	*/
294	>	public void testTryLock_Timeout() throws InterruptedException {
295	>	final ReentrantLock lock = new ReentrantLock();
296	>	lock.lock();
297	>	Thread t = newStartedThread(new CheckedRunnable() {
298	>	public void realRun() throws InterruptedException {
299	>	assertFalse(lock.tryLock(1, MILLISECONDS));
300	>	}});
301	>
302	>	awaitTermination(t);
303	>	lock.unlock();
304	>	}
305	>
306	>	/**
307	>	* getHoldCount returns number of recursive holds
308	>	*/
309		public void testGetHoldCount() {
310	<	ReentrantLock lock = new ReentrantLock();
311	<	for(int i = 1; i <= ReentrantLockTest.HOLD_COUNT_TEST_LIMIT;i++) {
312	<	lock.lock();
313	<	assertEquals(i,lock.getHoldCount());
314	<	}
315	<	for(int i = ReentrantLockTest.HOLD_COUNT_TEST_LIMIT; i > 0; i--) {
316	<	lock.unlock();
317	<	assertEquals(i-1,lock.getHoldCount());
318	<	}
319	<	}
320	<
321	<
322	<
323	<
324	<	public void testIsLocked() {
325	<	final ReentrantLock lock = new ReentrantLock();
326	<	lock.lock();
327	<	assertTrue(lock.isLocked());
328	<	lock.unlock();
329	<	assertFalse(lock.isLocked());
330	<	Thread t = new Thread(new Runnable() {
331	<	public void run() {
332	<	lock.lock();
333	<	try {
334	<	Thread.sleep(SHORT_DELAY_MS * 2);
335	<	}
336	<	catch(Exception e) {}
337	<	lock.unlock();
338	<	}
339	<	});
340	<	try{
341	<	t.start();
342	<	Thread.sleep(SHORT_DELAY_MS);
343	<	assertTrue(lock.isLocked());
344	<	t.join();
345	<	assertFalse(lock.isLocked());
346	<	} catch(Exception e){
347	<	fail("unexpected exception");
348	<	}
349	<
350	<	}
351	<
352	<	/*
353	<	* current thread locks interruptibly the thread
354	<	* another thread tries to aquire the lock and blocks
355	<	* on the call. interrupt the attempted aquireLock
356	<	* assert that the first lock() call actually locked the lock
357	<	* assert that the current thread is the one holding the lock
358	<	*/
359	<
360	<	public void testLockedInterruptibly() {
361	<	final ReentrantLock lock = new ReentrantLock();
362	<	try {lock.lockInterruptibly();} catch(Exception e) {}
363	<	Thread t = new Thread(new Runnable() {
364	<	public void run() {
365	<	try {
366	<	lock.lockInterruptibly();
367	<	fail("Failed to generate an Interrupted Exception");
368	<	}
369	<	catch(InterruptedException e) {}
370	<	}
371	<	});
372	<	t.start();
373	<	t.interrupt();
374	<	assertTrue(lock.isLocked());
375	<	assertTrue(lock.isHeldByCurrentThread());
310	>	ReentrantLock lock = new ReentrantLock();
311	>	for (int i = 1; i <= SIZE; i++) {
312	>	lock.lock();
313	>	assertEquals(i, lock.getHoldCount());
314	>	}
315	>	for (int i = SIZE; i > 0; i--) {
316	>	lock.unlock();
317	>	assertEquals(i-1, lock.getHoldCount());
318	>	}
319	>	}
320	>
321	>
322	>	/**
323	>	* isLocked is true when locked and false when not
324	>	*/
325	>	public void testIsLocked() throws InterruptedException {
326	>	final ReentrantLock lock = new ReentrantLock();
327	>	lock.lock();
328	>	assertTrue(lock.isLocked());
329	>	lock.unlock();
330	>	assertFalse(lock.isLocked());
331	>	Thread t = newStartedThread(new CheckedRunnable() {
332	>	public void realRun() throws InterruptedException {
333	>	lock.lock();
334	>	delay(SMALL_DELAY_MS);
335	>	lock.unlock();
336	>	}});
337	>
338	>	delay(SHORT_DELAY_MS);
339	>	assertTrue(lock.isLocked());
340	>	awaitTermination(t);
341	>	assertFalse(lock.isLocked());
342	>	}
343	>
344	>
345	>	/**
346	>	* lockInterruptibly is interruptible.
347	>	*/
348	>	public void testLockInterruptibly1() throws InterruptedException {
349	>	final ReentrantLock lock = new ReentrantLock();
350	>	lock.lock();
351	>	Thread t = newStartedThread(new InterruptedLockRunnable(lock));
352	>	delay(SHORT_DELAY_MS);
353	>	t.interrupt();
354	>	delay(SHORT_DELAY_MS);
355	>	lock.unlock();
356	>	awaitTermination(t);
357	>	}
358	>
359	>	/**
360	>	* lockInterruptibly succeeds when unlocked, else is interruptible
361	>	*/
362	>	public void testLockInterruptibly2() throws InterruptedException {
363	>	final ReentrantLock lock = new ReentrantLock();
364	>	lock.lockInterruptibly();
365	>	Thread t = newStartedThread(new InterruptedLockRunnable(lock));
366	>	delay(SHORT_DELAY_MS);
367	>	t.interrupt();
368	>	assertTrue(lock.isLocked());
369	>	assertTrue(lock.isHeldByCurrentThread());
370	>	awaitTermination(t);
371	>	}
372	>
373	>	/**
374	>	* Calling await without holding lock throws IllegalMonitorStateException
375	>	*/
376	>	public void testAwait_IllegalMonitor() throws InterruptedException {
377	>	final ReentrantLock lock = new ReentrantLock();
378	>	final Condition c = lock.newCondition();
379	>	try {
380	>	c.await();
381	>	shouldThrow();
382	>	} catch (IllegalMonitorStateException success) {}
383	>	}
384	>
385	>	/**
386	>	* Calling signal without holding lock throws IllegalMonitorStateException
387	>	*/
388	>	public void testSignal_IllegalMonitor() {
389	>	final ReentrantLock lock = new ReentrantLock();
390	>	final Condition c = lock.newCondition();
391	>	try {
392	>	c.signal();
393	>	shouldThrow();
394	>	} catch (IllegalMonitorStateException success) {}
395	>	}
396	>
397	>	/**
398	>	* awaitNanos without a signal times out
399	>	*/
400	>	public void testAwaitNanos_Timeout() throws InterruptedException {
401	>	final ReentrantLock lock = new ReentrantLock();
402	>	final Condition c = lock.newCondition();
403	>	lock.lock();
404	>	long t = c.awaitNanos(100);
405	>	assertTrue(t <= 0);
406	>	lock.unlock();
407	>	}
408	>
409	>	/**
410	>	* timed await without a signal times out
411	>	*/
412	>	public void testAwait_Timeout() throws InterruptedException {
413	>	final ReentrantLock lock = new ReentrantLock();
414	>	final Condition c = lock.newCondition();
415	>	lock.lock();
416	>	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
417	>	lock.unlock();
418	>	}
419	>
420	>	/**
421	>	* awaitUntil without a signal times out
422	>	*/
423	>	public void testAwaitUntil_Timeout() throws InterruptedException {
424	>	final ReentrantLock lock = new ReentrantLock();
425	>	final Condition c = lock.newCondition();
426	>	lock.lock();
427	>	java.util.Date d = new java.util.Date();
428	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
429	>	lock.unlock();
430	>	}
431	>
432	>	/**
433	>	* await returns when signalled
434	>	*/
435	>	public void testAwait() throws InterruptedException {
436	>	final ReentrantLock lock = new ReentrantLock();
437	>	final Condition c = lock.newCondition();
438	>	Thread t = newStartedThread(new CheckedRunnable() {
439	>	public void realRun() throws InterruptedException {
440	>	lock.lock();
441	>	c.await();
442	>	lock.unlock();
443	>	}});
444	>
445	>	delay(SHORT_DELAY_MS);
446	>	lock.lock();
447	>	c.signal();
448	>	lock.unlock();
449	>	awaitTermination(t);
450	>	}
451	>
452	>	/**
453	>	* hasWaiters throws NPE if null
454	>	*/
455	>	public void testHasWaitersNPE() {
456	>	final ReentrantLock lock = new ReentrantLock();
457	>	try {
458	>	lock.hasWaiters(null);
459	>	shouldThrow();
460	>	} catch (NullPointerException success) {}
461	>	}
462	>
463	>	/**
464	>	* getWaitQueueLength throws NPE if null
465	>	*/
466	>	public void testGetWaitQueueLengthNPE() {
467	>	final ReentrantLock lock = new ReentrantLock();
468	>	try {
469	>	lock.getWaitQueueLength(null);
470	>	shouldThrow();
471	>	} catch (NullPointerException success) {}
472	>	}
473	>
474	>
475	>	/**
476	>	* getWaitingThreads throws NPE if null
477	>	*/
478	>	public void testGetWaitingThreadsNPE() {
479	>	final PublicReentrantLock lock = new PublicReentrantLock();
480	>	try {
481	>	lock.getWaitingThreads(null);
482	>	shouldThrow();
483	>	} catch (NullPointerException success) {}
484	>	}
485	>
486	>
487	>	/**
488	>	* hasWaiters throws IAE if not owned
489	>	*/
490	>	public void testHasWaitersIAE() {
491	>	final ReentrantLock lock = new ReentrantLock();
492	>	final Condition c = lock.newCondition();
493	>	final ReentrantLock lock2 = new ReentrantLock();
494	>	try {
495	>	lock2.hasWaiters(c);
496	>	shouldThrow();
497	>	} catch (IllegalArgumentException success) {}
498	>	}
499	>
500	>	/**
501	>	* hasWaiters throws IMSE if not locked
502	>	*/
503	>	public void testHasWaitersIMSE() {
504	>	final ReentrantLock lock = new ReentrantLock();
505	>	final Condition c = lock.newCondition();
506	>	try {
507	>	lock.hasWaiters(c);
508	>	shouldThrow();
509	>	} catch (IllegalMonitorStateException success) {}
510	>	}
511	>
512	>
513	>	/**
514	>	* getWaitQueueLength throws IAE if not owned
515	>	*/
516	>	public void testGetWaitQueueLengthIAE() {
517	>	final ReentrantLock lock = new ReentrantLock();
518	>	final Condition c = lock.newCondition();
519	>	final ReentrantLock lock2 = new ReentrantLock();
520	>	try {
521	>	lock2.getWaitQueueLength(c);
522	>	shouldThrow();
523	>	} catch (IllegalArgumentException success) {}
524	>	}
525	>
526	>	/**
527	>	* getWaitQueueLength throws IMSE if not locked
528	>	*/
529	>	public void testGetWaitQueueLengthIMSE() {
530	>	final ReentrantLock lock = new ReentrantLock();
531	>	final Condition c = lock.newCondition();
532	>	try {
533	>	lock.getWaitQueueLength(c);
534	>	shouldThrow();
535	>	} catch (IllegalMonitorStateException success) {}
536	>	}
537	>
538	>
539	>	/**
540	>	* getWaitingThreads throws IAE if not owned
541	>	*/
542	>	public void testGetWaitingThreadsIAE() {
543	>	final PublicReentrantLock lock = new PublicReentrantLock();
544	>	final Condition c = lock.newCondition();
545	>	final PublicReentrantLock lock2 = new PublicReentrantLock();
546	>	try {
547	>	lock2.getWaitingThreads(c);
548	>	shouldThrow();
549	>	} catch (IllegalArgumentException success) {}
550	>	}
551	>
552	>	/**
553	>	* getWaitingThreads throws IMSE if not locked
554	>	*/
555	>	public void testGetWaitingThreadsIMSE() {
556	>	final PublicReentrantLock lock = new PublicReentrantLock();
557	>	final Condition c = lock.newCondition();
558	>	try {
559	>	lock.getWaitingThreads(c);
560	>	shouldThrow();
561	>	} catch (IllegalMonitorStateException success) {}
562	>	}
563	>
564	>
565	>	/**
566	>	* hasWaiters returns true when a thread is waiting, else false
567	>	*/
568	>	public void testHasWaiters() throws InterruptedException {
569	>	final ReentrantLock lock = new ReentrantLock();
570	>	final Condition c = lock.newCondition();
571	>	Thread t = newStartedThread(new CheckedRunnable() {
572	>	public void realRun() throws InterruptedException {
573	>	lock.lock();
574	>	assertFalse(lock.hasWaiters(c));
575	>	assertEquals(0, lock.getWaitQueueLength(c));
576	>	c.await();
577	>	lock.unlock();
578	>	}});
579	>
580	>	delay(SHORT_DELAY_MS);
581	>	lock.lock();
582	>	assertTrue(lock.hasWaiters(c));
583	>	assertEquals(1, lock.getWaitQueueLength(c));
584	>	c.signal();
585	>	lock.unlock();
586	>	delay(SHORT_DELAY_MS);
587	>	lock.lock();
588	>	assertFalse(lock.hasWaiters(c));
589	>	assertEquals(0, lock.getWaitQueueLength(c));
590	>	lock.unlock();
591	>	awaitTermination(t);
592	>	}
593	>
594	>	/**
595	>	* getWaitQueueLength returns number of waiting threads
596	>	*/
597	>	public void testGetWaitQueueLength() throws InterruptedException {
598	>	final ReentrantLock lock = new ReentrantLock();
599	>	final Condition c = lock.newCondition();
600	>	Thread t1 = newStartedThread(new CheckedRunnable() {
601	>	public void realRun() throws InterruptedException {
602	>	lock.lock();
603	>	assertFalse(lock.hasWaiters(c));
604	>	assertEquals(0, lock.getWaitQueueLength(c));
605	>	c.await();
606	>	lock.unlock();
607	>	}});
608	>
609	>	delay(SHORT_DELAY_MS);
610	>
611	>	Thread t2 = newStartedThread(new CheckedRunnable() {
612	>	public void realRun() throws InterruptedException {
613	>	lock.lock();
614	>	assertTrue(lock.hasWaiters(c));
615	>	assertEquals(1, lock.getWaitQueueLength(c));
616	>	c.await();
617	>	lock.unlock();
618	>	}});
619	>
620	>	delay(SHORT_DELAY_MS);
621	>	lock.lock();
622	>	assertTrue(lock.hasWaiters(c));
623	>	assertEquals(2, lock.getWaitQueueLength(c));
624	>	c.signalAll();
625	>	lock.unlock();
626	>	delay(SHORT_DELAY_MS);
627	>	lock.lock();
628	>	assertFalse(lock.hasWaiters(c));
629	>	assertEquals(0, lock.getWaitQueueLength(c));
630	>	lock.unlock();
631	>	awaitTermination(t1);
632	>	awaitTermination(t2);
633	>	}
634	>
635	>	/**
636	>	* getWaitingThreads returns only and all waiting threads
637	>	*/
638	>	public void testGetWaitingThreads() throws InterruptedException {
639	>	final PublicReentrantLock lock = new PublicReentrantLock();
640	>	final Condition c = lock.newCondition();
641	>	Thread t1 = new Thread(new CheckedRunnable() {
642	>	public void realRun() throws InterruptedException {
643	>	lock.lock();
644	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
645	>	c.await();
646	>	lock.unlock();
647	>	}});
648	>
649	>	Thread t2 = new Thread(new CheckedRunnable() {
650	>	public void realRun() throws InterruptedException {
651	>	lock.lock();
652	>	assertFalse(lock.getWaitingThreads(c).isEmpty());
653	>	c.await();
654	>	lock.unlock();
655	>	}});
656	>
657	>	lock.lock();
658	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
659	>	lock.unlock();
660	>	t1.start();
661	>	delay(SHORT_DELAY_MS);
662	>	t2.start();
663	>	delay(SHORT_DELAY_MS);
664	>	lock.lock();
665	>	assertTrue(lock.hasWaiters(c));
666	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
667	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
668	>	c.signalAll();
669	>	lock.unlock();
670	>	delay(SHORT_DELAY_MS);
671	>	lock.lock();
672	>	assertFalse(lock.hasWaiters(c));
673	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
674	>	lock.unlock();
675	>	awaitTermination(t1);
676	>	awaitTermination(t2);
677	>	}
678	>
679	>	/** A helper class for uninterruptible wait tests */
680	>	class UninterruptibleThread extends Thread {
681	>	private ReentrantLock lock;
682	>	private Condition c;
683	>
684	>	public volatile boolean canAwake = false;
685	>	public volatile boolean interrupted = false;
686	>	public volatile boolean lockStarted = false;
687	>
688	>	public UninterruptibleThread(ReentrantLock lock, Condition c) {
689	>	this.lock = lock;
690	>	this.c = c;
691	>	}
692	>
693	>	public synchronized void run() {
694	>	lock.lock();
695	>	lockStarted = true;
696	>
697	>	while (!canAwake) {
698	>	c.awaitUninterruptibly();
699	>	}
700	>
701	>	interrupted = isInterrupted();
702	>	lock.unlock();
703	>	}
704	>	}
705	>
706	>	/**
707	>	* awaitUninterruptibly doesn't abort on interrupt
708	>	*/
709	>	public void testAwaitUninterruptibly() throws InterruptedException {
710	>	final ReentrantLock lock = new ReentrantLock();
711	>	final Condition c = lock.newCondition();
712	>	UninterruptibleThread thread = new UninterruptibleThread(lock, c);
713	>
714	>	thread.start();
715	>
716	>	while (!thread.lockStarted) {
717	>	delay(100);
718	>	}
719	>
720	>	lock.lock();
721	>	try {
722	>	thread.interrupt();
723	>	thread.canAwake = true;
724	>	c.signal();
725	>	} finally {
726	>	lock.unlock();
727	>	}
728	>
729	>	thread.join();
730	>	assertTrue(thread.interrupted);
731	>	assertFalse(thread.isAlive());
732	>	}
733	>
734	>	/**
735	>	* await is interruptible
736	>	*/
737	>	public void testAwait_Interrupt() throws InterruptedException {
738	>	final ReentrantLock lock = new ReentrantLock();
739	>	final Condition c = lock.newCondition();
740	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
741	>	public void realRun() throws InterruptedException {
742	>	lock.lock();
743	>	c.await();
744	>	}});
745	>
746	>	delay(SHORT_DELAY_MS);
747	>	t.interrupt();
748	>	awaitTermination(t);
749	>	}
750	>
751	>	/**
752	>	* awaitNanos is interruptible
753	>	*/
754	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
755	>	final ReentrantLock lock = new ReentrantLock();
756	>	final Condition c = lock.newCondition();
757	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
758	>	public void realRun() throws InterruptedException {
759	>	lock.lock();
760	>	c.awaitNanos(MILLISECONDS.toNanos(LONG_DELAY_MS));
761	>	}});
762	>
763	>	delay(SHORT_DELAY_MS);
764	>	t.interrupt();
765	>	awaitTermination(t);
766	>	}
767	>
768	>	/**
769	>	* awaitUntil is interruptible
770	>	*/
771	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
772	>	final ReentrantLock lock = new ReentrantLock();
773	>	final Condition c = lock.newCondition();
774	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
775	>	public void realRun() throws InterruptedException {
776	>	lock.lock();
777	>	java.util.Date d = new java.util.Date();
778	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
779	>	}});
780	>
781	>	delay(SHORT_DELAY_MS);
782	>	t.interrupt();
783	>	awaitTermination(t);
784	>	}
785	>
786	>	/**
787	>	* signalAll wakes up all threads
788	>	*/
789	>	public void testSignalAll() throws InterruptedException {
790	>	final ReentrantLock lock = new ReentrantLock();
791	>	final Condition c = lock.newCondition();
792	>	Thread t1 = newStartedThread(new CheckedRunnable() {
793	>	public void realRun() throws InterruptedException {
794	>	lock.lock();
795	>	c.await();
796	>	lock.unlock();
797	>	}});
798	>
799	>	Thread t2 = newStartedThread(new CheckedRunnable() {
800	>	public void realRun() throws InterruptedException {
801	>	lock.lock();
802	>	c.await();
803	>	lock.unlock();
804	>	}});
805	>
806	>	delay(SHORT_DELAY_MS);
807	>	lock.lock();
808	>	c.signalAll();
809	>	lock.unlock();
810	>	awaitTermination(t1);
811	>	awaitTermination(t2);
812	>	}
813	>
814	>	/**
815	>	* await after multiple reentrant locking preserves lock count
816	>	*/
817	>	public void testAwaitLockCount() throws InterruptedException {
818	>	final ReentrantLock lock = new ReentrantLock();
819	>	final Condition c = lock.newCondition();
820	>	Thread t1 = newStartedThread(new CheckedRunnable() {
821	>	public void realRun() throws InterruptedException {
822	>	lock.lock();
823	>	assertEquals(1, lock.getHoldCount());
824	>	c.await();
825	>	assertEquals(1, lock.getHoldCount());
826	>	lock.unlock();
827	>	}});
828	>
829	>	Thread t2 = newStartedThread(new CheckedRunnable() {
830	>	public void realRun() throws InterruptedException {
831	>	lock.lock();
832	>	lock.lock();
833	>	assertEquals(2, lock.getHoldCount());
834	>	c.await();
835	>	assertEquals(2, lock.getHoldCount());
836	>	lock.unlock();
837	>	lock.unlock();
838	>	}});
839	>
840	>	delay(SHORT_DELAY_MS);
841	>	lock.lock();
842	>	c.signalAll();
843	>	lock.unlock();
844	>	awaitTermination(t1);
845	>	awaitTermination(t2);
846	>	}
847	>
848	>	/**
849	>	* A serialized lock deserializes as unlocked
850	>	*/
851	>	public void testSerialization() throws Exception {
852	>	ReentrantLock l = new ReentrantLock();
853	>	l.lock();
854	>	l.unlock();
855	>
856	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
857	>	ObjectOutputStream out =
858	>	new ObjectOutputStream(new BufferedOutputStream(bout));
859	>	out.writeObject(l);
860	>	out.close();
861	>
862	>	ByteArrayInputStream bin =
863	>	new ByteArrayInputStream(bout.toByteArray());
864	>	ObjectInputStream in =
865	>	new ObjectInputStream(new BufferedInputStream(bin));
866	>	ReentrantLock r = (ReentrantLock) in.readObject();
867	>	r.lock();
868	>	r.unlock();
869	>	}
870	>
871	>	/**
872	>	* toString indicates current lock state
873	>	*/
874	>	public void testToString() {
875	>	ReentrantLock lock = new ReentrantLock();
876	>	String us = lock.toString();
877	>	assertTrue(us.indexOf("Unlocked") >= 0);
878	>	lock.lock();
879	>	String ls = lock.toString();
880	>	assertTrue(ls.indexOf("Locked") >= 0);
881		}
155	–
882
883		}

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