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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.1 by dl, Sun Aug 31 19:24:55 2003 UTC vs.
Revision 1.52 by jsr166, Mon May 2 00:34:12 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.io.*;
14	+	import java.util.*;
15
16	<	public class ReentrantReadWriteLockTest extends TestCase {
13	<	static int HOLD_COUNT_TEST_LIMIT = 20;
14	<
16	>	public class ReentrantReadWriteLockTest 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(ReentrantReadWriteLockTest.class);
21	>	return new TestSuite(ReentrantReadWriteLockTest.class);
22		}
23
24	+	/**
25	+	* A runnable calling lockInterruptibly
26	+	*/
27	+	class InterruptibleLockRunnable extends CheckedRunnable {
28	+	final ReentrantReadWriteLock lock;
29	+	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
30	+	public void realRun() throws InterruptedException {
31	+	lock.writeLock().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 ReentrantReadWriteLock lock;
42	+	InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
43	+	public void realRun() throws InterruptedException {
44	+	lock.writeLock().lockInterruptibly();
45	+	}
46	+	}
47	+
48	+	/**
49	+	* Subclass to expose protected methods
50	+	*/
51	+	static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
52	+	PublicReentrantReadWriteLock() { 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	+	/**
62	+	* Releases lock, checking that it had a hold count of 1.
63	+	*/
64	+	void releaseLock(ReentrantReadWriteLock.WriteLock lock) {
65	+	assertTrue(lock.isHeldByCurrentThread());
66	+	lock.unlock();
67	+	assertFalse(lock.isHeldByCurrentThread());
68	+	}
69	+
70	+	/**
71	+	* Constructor sets given fairness, and is in unlocked state
72	+	*/
73	+	public void testConstructor() {
74	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
75	+	assertFalse(rl.isFair());
76	+	assertFalse(rl.isWriteLocked());
77	+	assertEquals(0, rl.getReadLockCount());
78	+	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
79	+	assertTrue(r2.isFair());
80	+	assertFalse(r2.isWriteLocked());
81	+	assertEquals(0, r2.getReadLockCount());
82	+	ReentrantReadWriteLock r3 = new ReentrantReadWriteLock(false);
83	+	assertFalse(r3.isFair());
84	+	assertFalse(r3.isWriteLocked());
85	+	assertEquals(0, r3.getReadLockCount());
86	+	}
87	+
88	+	/**
89	+	* write-locking and read-locking an unlocked lock succeed
90	+	*/
91	+	public void testLock() {
92	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
93	+	rl.writeLock().lock();
94	+	assertTrue(rl.isWriteLocked());
95	+	assertTrue(rl.isWriteLockedByCurrentThread());
96	+	assertTrue(rl.writeLock().isHeldByCurrentThread());
97	+	assertEquals(0, rl.getReadLockCount());
98	+	rl.writeLock().unlock();
99	+	assertFalse(rl.isWriteLocked());
100	+	assertFalse(rl.isWriteLockedByCurrentThread());
101	+	assertFalse(rl.writeLock().isHeldByCurrentThread());
102	+	assertEquals(0, rl.getReadLockCount());
103	+	rl.readLock().lock();
104	+	assertFalse(rl.isWriteLocked());
105	+	assertFalse(rl.isWriteLockedByCurrentThread());
106	+	assertEquals(1, rl.getReadLockCount());
107	+	rl.readLock().unlock();
108	+	assertFalse(rl.isWriteLocked());
109	+	assertFalse(rl.isWriteLockedByCurrentThread());
110	+	assertEquals(0, rl.getReadLockCount());
111	+	}
112	+
113	+
114	+	/**
115	+	* locking an unlocked fair lock succeeds
116	+	*/
117	+	public void testFairLock() {
118	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
119	+	rl.writeLock().lock();
120	+	assertTrue(rl.isWriteLocked());
121	+	assertTrue(rl.isWriteLockedByCurrentThread());
122	+	assertTrue(rl.writeLock().isHeldByCurrentThread());
123	+	assertEquals(0, rl.getReadLockCount());
124	+	rl.writeLock().unlock();
125	+	assertFalse(rl.isWriteLocked());
126	+	assertFalse(rl.isWriteLockedByCurrentThread());
127	+	assertFalse(rl.writeLock().isHeldByCurrentThread());
128	+	assertEquals(0, rl.getReadLockCount());
129	+	rl.readLock().lock();
130	+	assertFalse(rl.isWriteLocked());
131	+	assertFalse(rl.isWriteLockedByCurrentThread());
132	+	assertEquals(1, rl.getReadLockCount());
133	+	rl.readLock().unlock();
134	+	assertFalse(rl.isWriteLocked());
135	+	assertFalse(rl.isWriteLockedByCurrentThread());
136	+	assertEquals(0, rl.getReadLockCount());
137	+	}
138	+
139	+	/**
140	+	* getWriteHoldCount returns number of recursive holds
141	+	*/
142	+	public void testGetWriteHoldCount() {
143	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
144	+	for (int i = 1; i <= SIZE; i++) {
145	+	lock.writeLock().lock();
146	+	assertEquals(i,lock.getWriteHoldCount());
147	+	}
148	+	for (int i = SIZE; i > 0; i--) {
149	+	lock.writeLock().unlock();
150	+	assertEquals(i-1,lock.getWriteHoldCount());
151	+	}
152	+	}
153	+
154	+	/**
155	+	* WriteLock.getHoldCount returns number of recursive holds
156	+	*/
157	+	public void testGetHoldCount() {
158	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
159	+	for (int i = 1; i <= SIZE; i++) {
160	+	lock.writeLock().lock();
161	+	assertEquals(i,lock.writeLock().getHoldCount());
162	+	}
163	+	for (int i = SIZE; i > 0; i--) {
164	+	lock.writeLock().unlock();
165	+	assertEquals(i-1,lock.writeLock().getHoldCount());
166	+	}
167	+	}
168	+
169	+	/**
170	+	* getReadHoldCount returns number of recursive holds
171	+	*/
172	+	public void testGetReadHoldCount() {
173	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
174	+	for (int i = 1; i <= SIZE; i++) {
175	+	lock.readLock().lock();
176	+	assertEquals(i,lock.getReadHoldCount());
177	+	}
178	+	for (int i = SIZE; i > 0; i--) {
179	+	lock.readLock().unlock();
180	+	assertEquals(i-1,lock.getReadHoldCount());
181	+	}
182	+	}
183	+
184	+
185	+	/**
186	+	* write-unlocking an unlocked lock throws IllegalMonitorStateException
187	+	*/
188	+	public void testUnlock_IllegalMonitorStateException() {
189	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
190	+	try {
191	+	rl.writeLock().unlock();
192	+	shouldThrow();
193	+	} catch (IllegalMonitorStateException success) {}
194	+	}
195	+
196	+
197	+	/**
198	+	* write-lockInterruptibly is interruptible
199	+	*/
200	+	public void testWriteLockInterruptibly_Interrupted() throws Exception {
201	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
202	+	lock.writeLock().lock();
203	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
204	+	public void realRun() throws InterruptedException {
205	+	lock.writeLock().lockInterruptibly();
206	+	}});
207	+
208	+	Thread.sleep(SHORT_DELAY_MS);
209	+	t.interrupt();
210	+	t.join();
211	+	releaseLock(lock.writeLock());
212	+	}
213	+
214	+	/**
215	+	* timed write-tryLock is interruptible
216	+	*/
217	+	public void testWriteTryLock_Interrupted() throws InterruptedException {
218	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
219	+	lock.writeLock().lock();
220	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
221	+	public void realRun() throws InterruptedException {
222	+	lock.writeLock().tryLock(SMALL_DELAY_MS, MILLISECONDS);
223	+	}});
224	+
225	+	Thread.sleep(SHORT_DELAY_MS);
226	+	t.interrupt();
227	+	t.join();
228	+	releaseLock(lock.writeLock());
229	+	}
230	+
231	+	/**
232	+	* read-lockInterruptibly is interruptible
233	+	*/
234	+	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
235	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
236	+	lock.writeLock().lock();
237	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
238	+	public void realRun() throws InterruptedException {
239	+	lock.readLock().lockInterruptibly();
240	+	}});
241	+
242	+	Thread.sleep(SHORT_DELAY_MS);
243	+	t.interrupt();
244	+	t.join();
245	+	releaseLock(lock.writeLock());
246	+	}
247	+
248	+	/**
249	+	* timed read-tryLock is interruptible
250	+	*/
251	+	public void testReadTryLock_Interrupted() throws InterruptedException {
252	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
253	+	lock.writeLock().lock();
254	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
255	+	public void realRun() throws InterruptedException {
256	+	lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS);
257	+	}});
258	+
259	+	Thread.sleep(SHORT_DELAY_MS);
260	+	t.interrupt();
261	+	t.join();
262	+	releaseLock(lock.writeLock());
263	+	}
264	+
265	+
266	+	/**
267	+	* write-tryLock fails if locked
268	+	*/
269	+	public void testWriteTryLockWhenLocked() throws InterruptedException {
270	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
271	+	lock.writeLock().lock();
272	+	Thread t = newStartedThread(new CheckedRunnable() {
273	+	public void realRun() {
274	+	assertFalse(lock.writeLock().tryLock());
275	+	}});
276	+
277	+	t.join();
278	+	lock.writeLock().unlock();
279	+	}
280	+
281	+	/**
282	+	* read-tryLock fails if locked
283	+	*/
284	+	public void testReadTryLockWhenLocked() throws InterruptedException {
285	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
286	+	lock.writeLock().lock();
287	+	Thread t = newStartedThread(new CheckedRunnable() {
288	+	public void realRun() {
289	+	assertFalse(lock.readLock().tryLock());
290	+	}});
291	+
292	+	t.join();
293	+	lock.writeLock().unlock();
294	+	}
295	+
296	+	/**
297	+	* Multiple threads can hold a read lock when not write-locked
298	+	*/
299	+	public void testMultipleReadLocks() throws InterruptedException {
300	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
301	+	lock.readLock().lock();
302	+	Thread t = newStartedThread(new CheckedRunnable() {
303	+	public void realRun() {
304	+	assertTrue(lock.readLock().tryLock());
305	+	lock.readLock().unlock();
306	+	}});
307	+
308	+	t.join();
309	+	lock.readLock().unlock();
310	+	}
311	+
312	+	/**
313	+	* A writelock succeeds after reading threads unlock
314	+	*/
315	+	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
316	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
317	+	lock.readLock().lock();
318	+	Thread t1 = newStartedThread(new CheckedRunnable() {
319	+	public void realRun() {
320	+	lock.readLock().lock();
321	+	lock.readLock().unlock();
322	+	}});
323	+	Thread t2 = newStartedThread(new CheckedRunnable() {
324	+	public void realRun() {
325	+	lock.writeLock().lock();
326	+	lock.writeLock().unlock();
327	+	}});
328	+
329	+	Thread.sleep(SHORT_DELAY_MS);
330	+	lock.readLock().unlock();
331	+	t1.join(MEDIUM_DELAY_MS);
332	+	t2.join(MEDIUM_DELAY_MS);
333	+	assertTrue(!t1.isAlive());
334	+	assertTrue(!t2.isAlive());
335	+	}
336	+
337	+	/**
338	+	* Readlocks succeed after a writing thread unlocks
339	+	*/
340	+	public void testReadAfterWriteLock() throws InterruptedException {
341	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
342	+	lock.writeLock().lock();
343	+	Thread t1 = newStartedThread(new CheckedRunnable() {
344	+	public void realRun() {
345	+	lock.readLock().lock();
346	+	lock.readLock().unlock();
347	+	}});
348	+	Thread t2 = newStartedThread(new CheckedRunnable() {
349	+	public void realRun() {
350	+	lock.readLock().lock();
351	+	lock.readLock().unlock();
352	+	}});
353	+
354	+	Thread.sleep(SHORT_DELAY_MS);
355	+	lock.writeLock().unlock();
356	+	t1.join(MEDIUM_DELAY_MS);
357	+	t2.join(MEDIUM_DELAY_MS);
358	+	assertTrue(!t1.isAlive());
359	+	assertTrue(!t2.isAlive());
360	+	}
361	+
362	+	/**
363	+	* Read trylock succeeds if write locked by current thread
364	+	*/
365	+	public void testReadHoldingWriteLock() {
366	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
367	+	lock.writeLock().lock();
368	+	assertTrue(lock.readLock().tryLock());
369	+	lock.readLock().unlock();
370	+	lock.writeLock().unlock();
371	+	}
372	+
373	+	/**
374	+	* Read lock succeeds if write locked by current thread even if
375	+	* other threads are waiting for readlock
376	+	*/
377	+	public void testReadHoldingWriteLock2() throws InterruptedException {
378	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
379	+	lock.writeLock().lock();
380	+	Thread t1 = newStartedThread(new CheckedRunnable() {
381	+	public void realRun() {
382	+	lock.readLock().lock();
383	+	lock.readLock().unlock();
384	+	}});
385	+	Thread t2 = newStartedThread(new CheckedRunnable() {
386	+	public void realRun() {
387	+	lock.readLock().lock();
388	+	lock.readLock().unlock();
389	+	}});
390	+
391	+	lock.readLock().lock();
392	+	lock.readLock().unlock();
393	+	Thread.sleep(SHORT_DELAY_MS);
394	+	lock.readLock().lock();
395	+	lock.readLock().unlock();
396	+	lock.writeLock().unlock();
397	+	t1.join(MEDIUM_DELAY_MS);
398	+	t2.join(MEDIUM_DELAY_MS);
399	+	assertTrue(!t1.isAlive());
400	+	assertTrue(!t2.isAlive());
401	+	}
402	+
403	+	/**
404	+	* Read lock succeeds if write locked by current thread even if
405	+	* other threads are waiting for writelock
406	+	*/
407	+	public void testReadHoldingWriteLock3() throws InterruptedException {
408	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
409	+	lock.writeLock().lock();
410	+	Thread t1 = newStartedThread(new CheckedRunnable() {
411	+	public void realRun() {
412	+	lock.writeLock().lock();
413	+	lock.writeLock().unlock();
414	+	}});
415	+	Thread t2 = newStartedThread(new CheckedRunnable() {
416	+	public void realRun() {
417	+	lock.writeLock().lock();
418	+	lock.writeLock().unlock();
419	+	}});
420	+
421	+	lock.readLock().lock();
422	+	lock.readLock().unlock();
423	+	Thread.sleep(SHORT_DELAY_MS);
424	+	lock.readLock().lock();
425	+	lock.readLock().unlock();
426	+	lock.writeLock().unlock();
427	+	t1.join(MEDIUM_DELAY_MS);
428	+	t2.join(MEDIUM_DELAY_MS);
429	+	assertTrue(!t1.isAlive());
430	+	assertTrue(!t2.isAlive());
431	+	}
432	+
433	+
434	+	/**
435	+	* Write lock succeeds if write locked by current thread even if
436	+	* other threads are waiting for writelock
437	+	*/
438	+	public void testWriteHoldingWriteLock4() throws InterruptedException {
439	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
440	+	lock.writeLock().lock();
441	+	Thread t1 = newStartedThread(new CheckedRunnable() {
442	+	public void realRun() {
443	+	lock.writeLock().lock();
444	+	lock.writeLock().unlock();
445	+	}});
446	+	Thread t2 = newStartedThread(new CheckedRunnable() {
447	+	public void realRun() {
448	+	lock.writeLock().lock();
449	+	lock.writeLock().unlock();
450	+	}});
451	+
452	+	lock.writeLock().lock();
453	+	lock.writeLock().unlock();
454	+	Thread.sleep(SHORT_DELAY_MS);
455	+	lock.writeLock().lock();
456	+	lock.writeLock().unlock();
457	+	lock.writeLock().unlock();
458	+	t1.join(MEDIUM_DELAY_MS);
459	+	t2.join(MEDIUM_DELAY_MS);
460	+	assertTrue(!t1.isAlive());
461	+	assertTrue(!t2.isAlive());
462	+	}
463	+
464	+
465	+	/**
466	+	* Fair Read trylock succeeds if write locked by current thread
467	+	*/
468	+	public void testReadHoldingWriteLockFair() {
469	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
470	+	lock.writeLock().lock();
471	+	assertTrue(lock.readLock().tryLock());
472	+	lock.readLock().unlock();
473	+	lock.writeLock().unlock();
474	+	}
475	+
476	+	/**
477	+	* Fair Read lock succeeds if write locked by current thread even if
478	+	* other threads are waiting for readlock
479	+	*/
480	+	public void testReadHoldingWriteLockFair2() throws InterruptedException {
481	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
482	+	lock.writeLock().lock();
483	+	Thread t1 = newStartedThread(new CheckedRunnable() {
484	+	public void realRun() {
485	+	lock.readLock().lock();
486	+	lock.readLock().unlock();
487	+	}});
488	+	Thread t2 = newStartedThread(new CheckedRunnable() {
489	+	public void realRun() {
490	+	lock.readLock().lock();
491	+	lock.readLock().unlock();
492	+	}});
493	+
494	+	lock.readLock().lock();
495	+	lock.readLock().unlock();
496	+	Thread.sleep(SHORT_DELAY_MS);
497	+	lock.readLock().lock();
498	+	lock.readLock().unlock();
499	+	lock.writeLock().unlock();
500	+	t1.join(MEDIUM_DELAY_MS);
501	+	t2.join(MEDIUM_DELAY_MS);
502	+	assertTrue(!t1.isAlive());
503	+	assertTrue(!t2.isAlive());
504	+	}
505	+
506	+
507	+	/**
508	+	* Fair Read lock succeeds if write locked by current thread even if
509	+	* other threads are waiting for writelock
510	+	*/
511	+	public void testReadHoldingWriteLockFair3() throws InterruptedException {
512	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
513	+	lock.writeLock().lock();
514	+	Thread t1 = newStartedThread(new CheckedRunnable() {
515	+	public void realRun() {
516	+	lock.writeLock().lock();
517	+	lock.writeLock().unlock();
518	+	}});
519	+	Thread t2 = newStartedThread(new CheckedRunnable() {
520	+	public void realRun() {
521	+	lock.writeLock().lock();
522	+	lock.writeLock().unlock();
523	+	}});
524	+
525	+	lock.readLock().lock();
526	+	lock.readLock().unlock();
527	+	Thread.sleep(SHORT_DELAY_MS);
528	+	lock.readLock().lock();
529	+	lock.readLock().unlock();
530	+	lock.writeLock().unlock();
531	+	t1.join(MEDIUM_DELAY_MS);
532	+	t2.join(MEDIUM_DELAY_MS);
533	+	assertTrue(!t1.isAlive());
534	+	assertTrue(!t2.isAlive());
535	+	}
536
537	<	private static long SHORT_DELAY_MS = 100;
538	<	private static long MEDIUM_DELAY_MS = 1000;
539	<	private static long LONG_DELAY_MS = 10000;
540	<
541	<	/*
542	<	* Unlocks an unlocked lock, throws Illegal Monitor State
543	<	*
544	<	*/
545	<
546	<	public void testIllegalMonitorStateException(){
547	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
548	<	try{
549	<	rl.writeLock().unlock();
550	<	fail("Should of thown Illegal Monitor State Exception");
551	<
552	<	}catch(IllegalMonitorStateException sucess){}
553	<
554	<
555	<	}
556	<
557	<	/*
558	<	* makes a lock, locks it, tries to aquire the lock in another thread
559	<	* interrupts that thread and waits for an interrupted Exception to
560	<	* be thrown.
561	<	*/
562	<
563	<	public void testInterruptedException(){
564	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
565	<	lock.writeLock().lock();
566	<	Thread t = new Thread(new Runnable() {
567	<	public void run(){
568	<	try{
569	<	lock.writeLock().lockInterruptibly();
570	<	fail("should throw");
571	<	}catch(InterruptedException sucess){}
572	<	}
573	<	});
574	<	t.start();
575	<	t.interrupt();
576	<	lock.writeLock().unlock();
577	<	}
578	<
579	<	/*
580	<	* tests for interrupted exception on a timed wait
581	<	*
582	<	*/
583	<
584	<
585	<	public void testInterruptedException2(){
586	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
587	<	lock.writeLock().lock();
588	<	Thread t = new Thread(new Runnable() {
589	<	public void run(){
590	<	try{
591	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
592	<	fail("should throw");
593	<	}catch(InterruptedException sucess){}
594	<	}
595	<	});
596	<	t.start();
597	<	t.interrupt();
598	<	}
599	<
600	<
601	<
602	<	/*
603	<	* current thread locks interruptibly the thread
604	<	* another thread tries to aquire the lock and blocks
605	<	* on the call. interrupt the attempted aquireLock
606	<	* assert that the first lock() call actually locked the lock
607	<	* assert that the current thread is the one holding the lock
608	<	*/
609	<
610	<	public void testLockedInterruptibly() {
611	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
612	<	try {lock.writeLock().lockInterruptibly();} catch(Exception e) {}
613	<	Thread t = new Thread(new Runnable() {
614	<	public void run() {
615	<	try {
616	<	lock.writeLock().lockInterruptibly();
617	<	fail("Failed to generate an Interrupted Exception");
618	<	}
619	<	catch(InterruptedException e) {}
620	<	}
621	<	});
622	<	t.start();
623	<	t.interrupt();
537	>
538	>	/**
539	>	* Fair Write lock succeeds if write locked by current thread even if
540	>	* other threads are waiting for writelock
541	>	*/
542	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
543	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
544	>	lock.writeLock().lock();
545	>	Thread t1 = newStartedThread(new CheckedRunnable() {
546	>	public void realRun() {
547	>	lock.writeLock().lock();
548	>	lock.writeLock().unlock();
549	>	}});
550	>	Thread t2 = newStartedThread(new CheckedRunnable() {
551	>	public void realRun() {
552	>	lock.writeLock().lock();
553	>	lock.writeLock().unlock();
554	>	}});
555	>
556	>	Thread.sleep(SHORT_DELAY_MS);
557	>	assertTrue(lock.isWriteLockedByCurrentThread());
558	>	assertEquals(1, lock.getWriteHoldCount());
559	>	lock.writeLock().lock();
560	>	assertEquals(2, lock.getWriteHoldCount());
561	>	lock.writeLock().unlock();
562	>	lock.writeLock().lock();
563	>	lock.writeLock().unlock();
564	>	lock.writeLock().unlock();
565	>	t1.join(MEDIUM_DELAY_MS);
566	>	t2.join(MEDIUM_DELAY_MS);
567	>	assertTrue(!t1.isAlive());
568	>	assertTrue(!t2.isAlive());
569	>	}
570	>
571	>
572	>	/**
573	>	* Read tryLock succeeds if readlocked but not writelocked
574	>	*/
575	>	public void testTryLockWhenReadLocked() throws InterruptedException {
576	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
577	>	lock.readLock().lock();
578	>	Thread t = newStartedThread(new CheckedRunnable() {
579	>	public void realRun() {
580	>	assertTrue(lock.readLock().tryLock());
581	>	lock.readLock().unlock();
582	>	}});
583	>
584	>	t.join();
585	>	lock.readLock().unlock();
586	>	}
587	>
588	>	/**
589	>	* write tryLock fails when readlocked
590	>	*/
591	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
592	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
593	>	lock.readLock().lock();
594	>	Thread t = newStartedThread(new CheckedRunnable() {
595	>	public void realRun() {
596	>	assertFalse(lock.writeLock().tryLock());
597	>	}});
598	>
599	>	t.join();
600	>	lock.readLock().unlock();
601	>	}
602	>
603	>
604	>	/**
605	>	* Fair Read tryLock succeeds if readlocked but not writelocked
606	>	*/
607	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
608	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
609	>	lock.readLock().lock();
610	>	Thread t = newStartedThread(new CheckedRunnable() {
611	>	public void realRun() {
612	>	assertTrue(lock.readLock().tryLock());
613	>	lock.readLock().unlock();
614	>	}});
615	>
616	>	t.join();
617	>	lock.readLock().unlock();
618	>	}
619	>
620	>
621	>
622	>	/**
623	>	* Fair write tryLock fails when readlocked
624	>	*/
625	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
626	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
627	>	lock.readLock().lock();
628	>	Thread t = newStartedThread(new CheckedRunnable() {
629	>	public void realRun() {
630	>	assertFalse(lock.writeLock().tryLock());
631	>	}});
632	>
633	>	t.join();
634	>	lock.readLock().unlock();
635	>	}
636	>
637	>
638	>
639	>	/**
640	>	* write timed tryLock times out if locked
641	>	*/
642	>	public void testWriteTryLock_Timeout() throws InterruptedException {
643	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
644	>	lock.writeLock().lock();
645	>	Thread t = newStartedThread(new CheckedRunnable() {
646	>	public void realRun() throws InterruptedException {
647	>	assertFalse(lock.writeLock().tryLock(1, MILLISECONDS));
648	>	}});
649	>
650	>	t.join();
651	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
652	>	lock.writeLock().unlock();
653	>	}
654	>
655	>	/**
656	>	* read timed tryLock times out if write-locked
657	>	*/
658	>	public void testReadTryLock_Timeout() throws InterruptedException {
659	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
660	>	lock.writeLock().lock();
661	>	Thread t = newStartedThread(new CheckedRunnable() {
662	>	public void realRun() throws InterruptedException {
663	>	assertFalse(lock.readLock().tryLock(1, MILLISECONDS));
664	>	}});
665	>
666	>	t.join();
667	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
668	>	lock.writeLock().unlock();
669	>	}
670	>
671	>
672	>	/**
673	>	* write lockInterruptibly succeeds if lock free else is interruptible
674	>	*/
675	>	public void testWriteLockInterruptibly() throws InterruptedException {
676	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
677	>	lock.writeLock().lockInterruptibly();
678	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
679	>	public void realRun() throws InterruptedException {
680	>	lock.writeLock().lockInterruptibly();
681	>	}});
682	>
683	>	Thread.sleep(SHORT_DELAY_MS);
684	>	t.interrupt();
685	>	t.join();
686	>	releaseLock(lock.writeLock());
687	>	}
688	>
689	>	/**
690	>	* read lockInterruptibly succeeds if lock free else is interruptible
691	>	*/
692	>	public void testReadLockInterruptibly() throws InterruptedException {
693	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
694	>	lock.writeLock().lockInterruptibly();
695	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
696	>	public void realRun() throws InterruptedException {
697	>	lock.readLock().lockInterruptibly();
698	>	}});
699	>
700	>	Thread.sleep(SHORT_DELAY_MS);
701	>	t.interrupt();
702	>	t.join();
703	>	releaseLock(lock.writeLock());
704	>	}
705	>
706	>	/**
707	>	* Calling await without holding lock throws IllegalMonitorStateException
708	>	*/
709	>	public void testAwait_IllegalMonitor() throws InterruptedException {
710	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
711	>	final Condition c = lock.writeLock().newCondition();
712	>	try {
713	>	c.await();
714	>	shouldThrow();
715	>	} catch (IllegalMonitorStateException success) {}
716	>	}
717	>
718	>	/**
719	>	* Calling signal without holding lock throws IllegalMonitorStateException
720	>	*/
721	>	public void testSignal_IllegalMonitor() {
722	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
723	>	final Condition c = lock.writeLock().newCondition();
724	>	try {
725	>	c.signal();
726	>	shouldThrow();
727	>	} catch (IllegalMonitorStateException success) {}
728	>	}
729	>
730	>	/**
731	>	* awaitNanos without a signal times out
732	>	*/
733	>	public void testAwaitNanos_Timeout() throws InterruptedException {
734	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
735	>	final Condition c = lock.writeLock().newCondition();
736	>
737	>	lock.writeLock().lock();
738	>	long t = c.awaitNanos(100);
739	>	assertTrue(t <= 0);
740	>	lock.writeLock().unlock();
741	>	}
742	>
743	>
744	>	/**
745	>	* timed await without a signal times out
746	>	*/
747	>	public void testAwait_Timeout() throws InterruptedException {
748	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
749	>	final Condition c = lock.writeLock().newCondition();
750	>	lock.writeLock().lock();
751	>	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
752	>	lock.writeLock().unlock();
753	>	}
754	>
755	>	/**
756	>	* awaitUntil without a signal times out
757	>	*/
758	>	public void testAwaitUntil_Timeout() throws InterruptedException {
759	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
760	>	final Condition c = lock.writeLock().newCondition();
761	>	lock.writeLock().lock();
762	>	java.util.Date d = new java.util.Date();
763	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
764	>	lock.writeLock().unlock();
765	>	}
766	>
767	>	/**
768	>	* await returns when signalled
769	>	*/
770	>	public void testAwait() throws InterruptedException {
771	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
772	>	final Condition c = lock.writeLock().newCondition();
773	>	Thread t = newStartedThread(new CheckedRunnable() {
774	>	public void realRun() throws InterruptedException {
775	>	lock.writeLock().lock();
776	>	c.await();
777	>	lock.writeLock().unlock();
778	>	}});
779	>
780	>	Thread.sleep(SHORT_DELAY_MS);
781	>	lock.writeLock().lock();
782	>	c.signal();
783	>	lock.writeLock().unlock();
784	>	t.join(SHORT_DELAY_MS);
785	>	assertFalse(t.isAlive());
786	>	}
787	>
788	>	/** A helper class for uninterruptible wait tests */
789	>	class UninterruptableThread extends Thread {
790	>	private Lock lock;
791	>	private Condition c;
792	>
793	>	public volatile boolean canAwake = false;
794	>	public volatile boolean interrupted = false;
795	>	public volatile boolean lockStarted = false;
796	>
797	>	public UninterruptableThread(Lock lock, Condition c) {
798	>	this.lock = lock;
799	>	this.c = c;
800	>	}
801	>
802	>	public synchronized void run() {
803	>	lock.lock();
804	>	lockStarted = true;
805	>
806	>	while (!canAwake) {
807	>	c.awaitUninterruptibly();
808	>	}
809	>
810	>	interrupted = isInterrupted();
811	>	lock.unlock();
812	>	}
813	>	}
814	>
815	>	/**
816	>	* awaitUninterruptibly doesn't abort on interrupt
817	>	*/
818	>	public void testAwaitUninterruptibly() throws InterruptedException {
819	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
820	>	final Condition c = lock.writeLock().newCondition();
821	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
822	>
823	>	thread.start();
824	>
825	>	while (!thread.lockStarted) {
826	>	Thread.sleep(100);
827	>	}
828	>
829	>	lock.writeLock().lock();
830	>	try {
831	>	thread.interrupt();
832	>	thread.canAwake = true;
833	>	c.signal();
834	>	} finally {
835	>	lock.writeLock().unlock();
836	>	}
837	>
838	>	thread.join();
839	>	assertTrue(thread.interrupted);
840	>	assertFalse(thread.isAlive());
841	>	}
842	>
843	>	/**
844	>	* await is interruptible
845	>	*/
846	>	public void testAwait_Interrupt() throws InterruptedException {
847	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
848	>	final Condition c = lock.writeLock().newCondition();
849	>	final CountDownLatch locked = new CountDownLatch(1);
850	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
851	>	public void realRun() throws InterruptedException {
852	>	lock.writeLock().lock();
853	>	assertTrue(lock.isWriteLocked());
854	>	locked.countDown();
855	>	try { c.await(); }
856	>	finally { lock.writeLock().unlock(); }
857	>	}});
858	>
859	>	locked.await();
860	>	while (lock.isWriteLocked())
861	>	Thread.yield();
862	>	t.interrupt();
863	>	awaitTermination(t, LONG_DELAY_MS);
864	>	assertFalse(lock.isWriteLocked());
865	>	}
866	>
867	>	/**
868	>	* awaitNanos is interruptible
869	>	*/
870	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
871	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
872	>	final Condition c = lock.writeLock().newCondition();
873	>	final CountDownLatch locked = new CountDownLatch(1);
874	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
875	>	public void realRun() throws InterruptedException {
876	>	lock.writeLock().lock();
877	>	assertTrue(lock.isWriteLocked());
878	>	locked.countDown();
879	>	try { c.awaitNanos(MILLISECONDS.toNanos(LONG_DELAY_MS)); }
880	>	finally { lock.writeLock().unlock(); }
881	>	}});
882	>
883	>	locked.await();
884	>	while (lock.isWriteLocked())
885	>	Thread.yield();
886	>	t.interrupt();
887	>	awaitTermination(t, LONG_DELAY_MS);
888	>	assertFalse(lock.isWriteLocked());
889	>	}
890	>
891	>	/**
892	>	* awaitUntil is interruptible
893	>	*/
894	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
895	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
896	>	final Condition c = lock.writeLock().newCondition();
897	>	final CountDownLatch locked = new CountDownLatch(1);
898	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
899	>	public void realRun() throws InterruptedException {
900	>	lock.writeLock().lock();
901	>	assertTrue(lock.isWriteLocked());
902	>	locked.countDown();
903	>	java.util.Date d = new java.util.Date();
904	>	try { c.awaitUntil(new java.util.Date(d.getTime() + 10000)); }
905	>	finally { lock.writeLock().unlock(); }
906	>	}});
907	>
908	>	locked.await();
909	>	while (lock.isWriteLocked())
910	>	Thread.yield();
911	>	t.interrupt();
912	>	awaitTermination(t, LONG_DELAY_MS);
913	>	assertFalse(lock.isWriteLocked());
914	>	}
915	>
916	>	/**
917	>	* signalAll wakes up all threads
918	>	*/
919	>	public void testSignalAll() throws InterruptedException {
920	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
921	>	final Condition c = lock.writeLock().newCondition();
922	>	Thread t1 = newStartedThread(new CheckedRunnable() {
923	>	public void realRun() throws InterruptedException {
924	>	lock.writeLock().lock();
925	>	c.await();
926	>	lock.writeLock().unlock();
927	>	}});
928	>
929	>	Thread t2 = newStartedThread(new CheckedRunnable() {
930	>	public void realRun() throws InterruptedException {
931	>	lock.writeLock().lock();
932	>	c.await();
933	>	lock.writeLock().unlock();
934	>	}});
935	>
936	>	Thread.sleep(SHORT_DELAY_MS);
937	>	lock.writeLock().lock();
938	>	c.signalAll();
939	>	lock.writeLock().unlock();
940	>	t1.join(SHORT_DELAY_MS);
941	>	t2.join(SHORT_DELAY_MS);
942	>	assertFalse(t1.isAlive());
943	>	assertFalse(t2.isAlive());
944	>	}
945	>
946	>	/**
947	>	* A serialized lock deserializes as unlocked
948	>	*/
949	>	public void testSerialization() throws Exception {
950	>	ReentrantReadWriteLock l = new ReentrantReadWriteLock();
951	>	l.readLock().lock();
952	>	l.readLock().unlock();
953	>
954	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
955	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
956	>	out.writeObject(l);
957	>	out.close();
958	>
959	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
960	>	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
961	>	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
962	>	r.readLock().lock();
963	>	r.readLock().unlock();
964	>	}
965	>
966	>	/**
967	>	* hasQueuedThreads reports whether there are waiting threads
968	>	*/
969	>	public void testhasQueuedThreads() throws InterruptedException {
970	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
971	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
972	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
973	>	assertFalse(lock.hasQueuedThreads());
974	>	lock.writeLock().lock();
975	>	t1.start();
976	>	Thread.sleep(SHORT_DELAY_MS);
977	>	assertTrue(lock.hasQueuedThreads());
978	>	t2.start();
979	>	Thread.sleep(SHORT_DELAY_MS);
980	>	assertTrue(lock.hasQueuedThreads());
981	>	t1.interrupt();
982	>	Thread.sleep(SHORT_DELAY_MS);
983	>	assertTrue(lock.hasQueuedThreads());
984	>	lock.writeLock().unlock();
985	>	Thread.sleep(SHORT_DELAY_MS);
986	>	assertFalse(lock.hasQueuedThreads());
987	>	t1.join();
988	>	t2.join();
989	>	}
990	>
991	>	/**
992	>	* hasQueuedThread(null) throws NPE
993	>	*/
994	>	public void testHasQueuedThreadNPE() {
995	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
996	>	try {
997	>	sync.hasQueuedThread(null);
998	>	shouldThrow();
999	>	} catch (NullPointerException success) {}
1000	>	}
1001	>
1002	>	/**
1003	>	* hasQueuedThread reports whether a thread is queued.
1004	>	*/
1005	>	public void testHasQueuedThread() throws InterruptedException {
1006	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1007	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1008	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1009	>	assertFalse(sync.hasQueuedThread(t1));
1010	>	assertFalse(sync.hasQueuedThread(t2));
1011	>	sync.writeLock().lock();
1012	>	t1.start();
1013	>	Thread.sleep(SHORT_DELAY_MS);
1014	>	assertTrue(sync.hasQueuedThread(t1));
1015	>	t2.start();
1016	>	Thread.sleep(SHORT_DELAY_MS);
1017	>	assertTrue(sync.hasQueuedThread(t1));
1018	>	assertTrue(sync.hasQueuedThread(t2));
1019	>	t1.interrupt();
1020	>	Thread.sleep(SHORT_DELAY_MS);
1021	>	assertFalse(sync.hasQueuedThread(t1));
1022	>	assertTrue(sync.hasQueuedThread(t2));
1023	>	sync.writeLock().unlock();
1024	>	Thread.sleep(SHORT_DELAY_MS);
1025	>	assertFalse(sync.hasQueuedThread(t1));
1026	>	Thread.sleep(SHORT_DELAY_MS);
1027	>	assertFalse(sync.hasQueuedThread(t2));
1028	>	t1.join();
1029	>	t2.join();
1030	>	}
1031	>
1032	>
1033	>	/**
1034	>	* getQueueLength reports number of waiting threads
1035	>	*/
1036	>	public void testGetQueueLength() throws InterruptedException {
1037	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1038	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1039	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1040	>	assertEquals(0, lock.getQueueLength());
1041	>	lock.writeLock().lock();
1042	>	t1.start();
1043	>	Thread.sleep(SHORT_DELAY_MS);
1044	>	assertEquals(1, lock.getQueueLength());
1045	>	t2.start();
1046	>	Thread.sleep(SHORT_DELAY_MS);
1047	>	assertEquals(2, lock.getQueueLength());
1048	>	t1.interrupt();
1049	>	Thread.sleep(SHORT_DELAY_MS);
1050	>	assertEquals(1, lock.getQueueLength());
1051	>	lock.writeLock().unlock();
1052	>	Thread.sleep(SHORT_DELAY_MS);
1053	>	assertEquals(0, lock.getQueueLength());
1054	>	t1.join();
1055	>	t2.join();
1056	>	}
1057	>
1058	>	/**
1059	>	* getQueuedThreads includes waiting threads
1060	>	*/
1061	>	public void testGetQueuedThreads() throws InterruptedException {
1062	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1063	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1064	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1065	>	assertTrue(lock.getQueuedThreads().isEmpty());
1066	>	lock.writeLock().lock();
1067	>	assertTrue(lock.getQueuedThreads().isEmpty());
1068	>	t1.start();
1069	>	Thread.sleep(SHORT_DELAY_MS);
1070	>	assertTrue(lock.getQueuedThreads().contains(t1));
1071	>	t2.start();
1072	>	Thread.sleep(SHORT_DELAY_MS);
1073	>	assertTrue(lock.getQueuedThreads().contains(t1));
1074	>	assertTrue(lock.getQueuedThreads().contains(t2));
1075	>	t1.interrupt();
1076	>	Thread.sleep(SHORT_DELAY_MS);
1077	>	assertFalse(lock.getQueuedThreads().contains(t1));
1078	>	assertTrue(lock.getQueuedThreads().contains(t2));
1079	>	lock.writeLock().unlock();
1080	>	Thread.sleep(SHORT_DELAY_MS);
1081	>	assertTrue(lock.getQueuedThreads().isEmpty());
1082	>	t1.join();
1083	>	t2.join();
1084	>	}
1085	>
1086	>	/**
1087	>	* hasWaiters throws NPE if null
1088	>	*/
1089	>	public void testHasWaitersNPE() {
1090	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1091	>	try {
1092	>	lock.hasWaiters(null);
1093	>	shouldThrow();
1094	>	} catch (NullPointerException success) {}
1095	>	}
1096	>
1097	>	/**
1098	>	* getWaitQueueLength throws NPE if null
1099	>	*/
1100	>	public void testGetWaitQueueLengthNPE() {
1101	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1102	>	try {
1103	>	lock.getWaitQueueLength(null);
1104	>	shouldThrow();
1105	>	} catch (NullPointerException success) {}
1106	>	}
1107	>
1108	>
1109	>	/**
1110	>	* getWaitingThreads throws NPE if null
1111	>	*/
1112	>	public void testGetWaitingThreadsNPE() {
1113	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1114	>	try {
1115	>	lock.getWaitingThreads(null);
1116	>	shouldThrow();
1117	>	} catch (NullPointerException success) {}
1118	>	}
1119	>
1120	>	/**
1121	>	* hasWaiters throws IAE if not owned
1122	>	*/
1123	>	public void testHasWaitersIAE() {
1124	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1125	>	final Condition c = lock.writeLock().newCondition();
1126	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1127	>	try {
1128	>	lock2.hasWaiters(c);
1129	>	shouldThrow();
1130	>	} catch (IllegalArgumentException success) {}
1131	>	}
1132	>
1133	>	/**
1134	>	* hasWaiters throws IMSE if not locked
1135	>	*/
1136	>	public void testHasWaitersIMSE() {
1137	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1138	>	final Condition c = lock.writeLock().newCondition();
1139	>	try {
1140	>	lock.hasWaiters(c);
1141	>	shouldThrow();
1142	>	} catch (IllegalMonitorStateException success) {}
1143	>	}
1144	>
1145	>
1146	>	/**
1147	>	* getWaitQueueLength throws IAE if not owned
1148	>	*/
1149	>	public void testGetWaitQueueLengthIAE() {
1150	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1151	>	final Condition c = lock.writeLock().newCondition();
1152	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1153	>	try {
1154	>	lock2.getWaitQueueLength(c);
1155	>	shouldThrow();
1156	>	} catch (IllegalArgumentException success) {}
1157	>	}
1158	>
1159	>	/**
1160	>	* getWaitQueueLength throws IMSE if not locked
1161	>	*/
1162	>	public void testGetWaitQueueLengthIMSE() {
1163	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1164	>	final Condition c = lock.writeLock().newCondition();
1165	>	try {
1166	>	lock.getWaitQueueLength(c);
1167	>	shouldThrow();
1168	>	} catch (IllegalMonitorStateException success) {}
1169	>	}
1170	>
1171	>
1172	>	/**
1173	>	* getWaitingThreads throws IAE if not owned
1174	>	*/
1175	>	public void testGetWaitingThreadsIAE() {
1176	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1177	>	final Condition c = lock.writeLock().newCondition();
1178	>	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1179	>	try {
1180	>	lock2.getWaitingThreads(c);
1181	>	shouldThrow();
1182	>	} catch (IllegalArgumentException success) {}
1183	>	}
1184	>
1185	>	/**
1186	>	* getWaitingThreads throws IMSE if not locked
1187	>	*/
1188	>	public void testGetWaitingThreadsIMSE() {
1189	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1190	>	final Condition c = lock.writeLock().newCondition();
1191	>	try {
1192	>	lock.getWaitingThreads(c);
1193	>	shouldThrow();
1194	>	} catch (IllegalMonitorStateException success) {}
1195	>	}
1196	>
1197	>
1198	>	/**
1199	>	* hasWaiters returns true when a thread is waiting, else false
1200	>	*/
1201	>	public void testHasWaiters() throws InterruptedException {
1202	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1203	>	final Condition c = lock.writeLock().newCondition();
1204	>	Thread t = newStartedThread(new CheckedRunnable() {
1205	>	public void realRun() throws InterruptedException {
1206	>	lock.writeLock().lock();
1207	>	assertFalse(lock.hasWaiters(c));
1208	>	assertEquals(0, lock.getWaitQueueLength(c));
1209	>	c.await();
1210	>	lock.writeLock().unlock();
1211	>	}});
1212	>
1213	>	Thread.sleep(SHORT_DELAY_MS);
1214	>	lock.writeLock().lock();
1215	>	assertTrue(lock.hasWaiters(c));
1216	>	assertEquals(1, lock.getWaitQueueLength(c));
1217	>	c.signal();
1218	>	lock.writeLock().unlock();
1219	>	Thread.sleep(SHORT_DELAY_MS);
1220	>	lock.writeLock().lock();
1221	>	assertFalse(lock.hasWaiters(c));
1222	>	assertEquals(0, lock.getWaitQueueLength(c));
1223	>	lock.writeLock().unlock();
1224	>	t.join(SHORT_DELAY_MS);
1225	>	assertFalse(t.isAlive());
1226	>	}
1227	>
1228	>	/**
1229	>	* getWaitQueueLength returns number of waiting threads
1230	>	*/
1231	>	public void testGetWaitQueueLength() throws InterruptedException {
1232	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1233	>	final Condition c = lock.writeLock().newCondition();
1234	>	Thread t = newStartedThread(new CheckedRunnable() {
1235	>	public void realRun() throws InterruptedException {
1236	>	lock.writeLock().lock();
1237	>	assertFalse(lock.hasWaiters(c));
1238	>	assertEquals(0, lock.getWaitQueueLength(c));
1239	>	c.await();
1240	>	lock.writeLock().unlock();
1241	>	}});
1242	>
1243	>	Thread.sleep(SHORT_DELAY_MS);
1244	>	lock.writeLock().lock();
1245	>	assertTrue(lock.hasWaiters(c));
1246	>	assertEquals(1, lock.getWaitQueueLength(c));
1247	>	c.signal();
1248	>	lock.writeLock().unlock();
1249	>	Thread.sleep(SHORT_DELAY_MS);
1250	>	lock.writeLock().lock();
1251	>	assertFalse(lock.hasWaiters(c));
1252	>	assertEquals(0, lock.getWaitQueueLength(c));
1253	>	lock.writeLock().unlock();
1254	>	t.join(SHORT_DELAY_MS);
1255	>	assertFalse(t.isAlive());
1256	>	}
1257	>
1258	>
1259	>	/**
1260	>	* getWaitingThreads returns only and all waiting threads
1261	>	*/
1262	>	public void testGetWaitingThreads() throws InterruptedException {
1263	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1264	>	final Condition c = lock.writeLock().newCondition();
1265	>	Thread t1 = new Thread(new CheckedRunnable() {
1266	>	public void realRun() throws InterruptedException {
1267	>	lock.writeLock().lock();
1268	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1269	>	c.await();
1270	>	lock.writeLock().unlock();
1271	>	}});
1272	>
1273	>	Thread t2 = new Thread(new CheckedRunnable() {
1274	>	public void realRun() throws InterruptedException {
1275	>	lock.writeLock().lock();
1276	>	assertFalse(lock.getWaitingThreads(c).isEmpty());
1277	>	c.await();
1278	>	lock.writeLock().unlock();
1279	>	}});
1280	>
1281	>	lock.writeLock().lock();
1282	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1283	>	lock.writeLock().unlock();
1284	>	t1.start();
1285	>	Thread.sleep(SHORT_DELAY_MS);
1286	>	t2.start();
1287	>	Thread.sleep(SHORT_DELAY_MS);
1288	>	lock.writeLock().lock();
1289	>	assertTrue(lock.hasWaiters(c));
1290	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
1291	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
1292	>	c.signalAll();
1293	>	lock.writeLock().unlock();
1294	>	Thread.sleep(SHORT_DELAY_MS);
1295	>	lock.writeLock().lock();
1296	>	assertFalse(lock.hasWaiters(c));
1297	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1298	>	lock.writeLock().unlock();
1299	>	t1.join(SHORT_DELAY_MS);
1300	>	t2.join(SHORT_DELAY_MS);
1301	>	assertFalse(t1.isAlive());
1302	>	assertFalse(t2.isAlive());
1303	>	}
1304	>
1305	>	/**
1306	>	* toString indicates current lock state
1307	>	*/
1308	>	public void testToString() {
1309	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1310	>	String us = lock.toString();
1311	>	assertTrue(us.indexOf("Write locks = 0") >= 0);
1312	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1313	>	lock.writeLock().lock();
1314	>	String ws = lock.toString();
1315	>	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1316	>	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1317	>	lock.writeLock().unlock();
1318	>	lock.readLock().lock();
1319	>	lock.readLock().lock();
1320	>	String rs = lock.toString();
1321	>	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1322	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1323	>	}
1324	>
1325	>	/**
1326	>	* readLock.toString indicates current lock state
1327	>	*/
1328	>	public void testReadLockToString() {
1329	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1330	>	String us = lock.readLock().toString();
1331	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1332	>	lock.readLock().lock();
1333	>	lock.readLock().lock();
1334	>	String rs = lock.readLock().toString();
1335	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1336	>	}
1337	>
1338	>	/**
1339	>	* writeLock.toString indicates current lock state
1340	>	*/
1341	>	public void testWriteLockToString() {
1342	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1343	>	String us = lock.writeLock().toString();
1344	>	assertTrue(us.indexOf("Unlocked") >= 0);
1345	>	lock.writeLock().lock();
1346	>	String ls = lock.writeLock().toString();
1347	>	assertTrue(ls.indexOf("Locked") >= 0);
1348		}
112	–
1349
1350		}

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