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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 1.48 by jsr166, Mon May 2 00:06:45 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	+	}
263	+
264	+
265	+	/**
266	+	* write-tryLock fails if locked
267	+	*/
268	+	public void testWriteTryLockWhenLocked() throws InterruptedException {
269	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
270	+	lock.writeLock().lock();
271	+	Thread t = newStartedThread(new CheckedRunnable() {
272	+	public void realRun() {
273	+	assertFalse(lock.writeLock().tryLock());
274	+	}});
275	+
276	+	t.join();
277	+	lock.writeLock().unlock();
278	+	}
279	+
280	+	/**
281	+	* read-tryLock fails if locked
282	+	*/
283	+	public void testReadTryLockWhenLocked() throws InterruptedException {
284	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
285	+	lock.writeLock().lock();
286	+	Thread t = newStartedThread(new CheckedRunnable() {
287	+	public void realRun() {
288	+	assertFalse(lock.readLock().tryLock());
289	+	}});
290	+
291	+	t.join();
292	+	lock.writeLock().unlock();
293	+	}
294	+
295	+	/**
296	+	* Multiple threads can hold a read lock when not write-locked
297	+	*/
298	+	public void testMultipleReadLocks() throws InterruptedException {
299	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
300	+	lock.readLock().lock();
301	+	Thread t = newStartedThread(new CheckedRunnable() {
302	+	public void realRun() {
303	+	assertTrue(lock.readLock().tryLock());
304	+	lock.readLock().unlock();
305	+	}});
306	+
307	+	t.join();
308	+	lock.readLock().unlock();
309	+	}
310	+
311	+	/**
312	+	* A writelock succeeds after reading threads unlock
313	+	*/
314	+	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
315	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
316	+	lock.readLock().lock();
317	+	Thread t1 = newStartedThread(new CheckedRunnable() {
318	+	public void realRun() {
319	+	lock.readLock().lock();
320	+	lock.readLock().unlock();
321	+	}});
322	+	Thread t2 = newStartedThread(new CheckedRunnable() {
323	+	public void realRun() {
324	+	lock.writeLock().lock();
325	+	lock.writeLock().unlock();
326	+	}});
327	+
328	+	Thread.sleep(SHORT_DELAY_MS);
329	+	lock.readLock().unlock();
330	+	t1.join(MEDIUM_DELAY_MS);
331	+	t2.join(MEDIUM_DELAY_MS);
332	+	assertTrue(!t1.isAlive());
333	+	assertTrue(!t2.isAlive());
334	+	}
335	+
336	+	/**
337	+	* Readlocks succeed after a writing thread unlocks
338	+	*/
339	+	public void testReadAfterWriteLock() throws InterruptedException {
340	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
341	+	lock.writeLock().lock();
342	+	Thread t1 = newStartedThread(new CheckedRunnable() {
343	+	public void realRun() {
344	+	lock.readLock().lock();
345	+	lock.readLock().unlock();
346	+	}});
347	+	Thread t2 = newStartedThread(new CheckedRunnable() {
348	+	public void realRun() {
349	+	lock.readLock().lock();
350	+	lock.readLock().unlock();
351	+	}});
352	+
353	+	Thread.sleep(SHORT_DELAY_MS);
354	+	lock.writeLock().unlock();
355	+	t1.join(MEDIUM_DELAY_MS);
356	+	t2.join(MEDIUM_DELAY_MS);
357	+	assertTrue(!t1.isAlive());
358	+	assertTrue(!t2.isAlive());
359	+	}
360	+
361	+	/**
362	+	* Read trylock succeeds if write locked by current thread
363	+	*/
364	+	public void testReadHoldingWriteLock() {
365	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
366	+	lock.writeLock().lock();
367	+	assertTrue(lock.readLock().tryLock());
368	+	lock.readLock().unlock();
369	+	lock.writeLock().unlock();
370	+	}
371	+
372	+	/**
373	+	* Read lock succeeds if write locked by current thread even if
374	+	* other threads are waiting for readlock
375	+	*/
376	+	public void testReadHoldingWriteLock2() throws InterruptedException {
377	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
378	+	lock.writeLock().lock();
379	+	Thread t1 = newStartedThread(new CheckedRunnable() {
380	+	public void realRun() {
381	+	lock.readLock().lock();
382	+	lock.readLock().unlock();
383	+	}});
384	+	Thread t2 = newStartedThread(new CheckedRunnable() {
385	+	public void realRun() {
386	+	lock.readLock().lock();
387	+	lock.readLock().unlock();
388	+	}});
389	+
390	+	lock.readLock().lock();
391	+	lock.readLock().unlock();
392	+	Thread.sleep(SHORT_DELAY_MS);
393	+	lock.readLock().lock();
394	+	lock.readLock().unlock();
395	+	lock.writeLock().unlock();
396	+	t1.join(MEDIUM_DELAY_MS);
397	+	t2.join(MEDIUM_DELAY_MS);
398	+	assertTrue(!t1.isAlive());
399	+	assertTrue(!t2.isAlive());
400	+	}
401	+
402	+	/**
403	+	* Read lock succeeds if write locked by current thread even if
404	+	* other threads are waiting for writelock
405	+	*/
406	+	public void testReadHoldingWriteLock3() throws InterruptedException {
407	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
408	+	lock.writeLock().lock();
409	+	Thread t1 = newStartedThread(new CheckedRunnable() {
410	+	public void realRun() {
411	+	lock.writeLock().lock();
412	+	lock.writeLock().unlock();
413	+	}});
414	+	Thread t2 = newStartedThread(new CheckedRunnable() {
415	+	public void realRun() {
416	+	lock.writeLock().lock();
417	+	lock.writeLock().unlock();
418	+	}});
419	+
420	+	lock.readLock().lock();
421	+	lock.readLock().unlock();
422	+	Thread.sleep(SHORT_DELAY_MS);
423	+	lock.readLock().lock();
424	+	lock.readLock().unlock();
425	+	lock.writeLock().unlock();
426	+	t1.join(MEDIUM_DELAY_MS);
427	+	t2.join(MEDIUM_DELAY_MS);
428	+	assertTrue(!t1.isAlive());
429	+	assertTrue(!t2.isAlive());
430	+	}
431	+
432	+
433	+	/**
434	+	* Write lock succeeds if write locked by current thread even if
435	+	* other threads are waiting for writelock
436	+	*/
437	+	public void testWriteHoldingWriteLock4() throws InterruptedException {
438	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
439	+	lock.writeLock().lock();
440	+	Thread t1 = newStartedThread(new CheckedRunnable() {
441	+	public void realRun() {
442	+	lock.writeLock().lock();
443	+	lock.writeLock().unlock();
444	+	}});
445	+	Thread t2 = newStartedThread(new CheckedRunnable() {
446	+	public void realRun() {
447	+	lock.writeLock().lock();
448	+	lock.writeLock().unlock();
449	+	}});
450	+
451	+	lock.writeLock().lock();
452	+	lock.writeLock().unlock();
453	+	Thread.sleep(SHORT_DELAY_MS);
454	+	lock.writeLock().lock();
455	+	lock.writeLock().unlock();
456	+	lock.writeLock().unlock();
457	+	t1.join(MEDIUM_DELAY_MS);
458	+	t2.join(MEDIUM_DELAY_MS);
459	+	assertTrue(!t1.isAlive());
460	+	assertTrue(!t2.isAlive());
461	+	}
462	+
463	+
464	+	/**
465	+	* Fair Read trylock succeeds if write locked by current thread
466	+	*/
467	+	public void testReadHoldingWriteLockFair() {
468	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
469	+	lock.writeLock().lock();
470	+	assertTrue(lock.readLock().tryLock());
471	+	lock.readLock().unlock();
472	+	lock.writeLock().unlock();
473	+	}
474	+
475	+	/**
476	+	* Fair Read lock succeeds if write locked by current thread even if
477	+	* other threads are waiting for readlock
478	+	*/
479	+	public void testReadHoldingWriteLockFair2() throws InterruptedException {
480	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
481	+	lock.writeLock().lock();
482	+	Thread t1 = newStartedThread(new CheckedRunnable() {
483	+	public void realRun() {
484	+	lock.readLock().lock();
485	+	lock.readLock().unlock();
486	+	}});
487	+	Thread t2 = newStartedThread(new CheckedRunnable() {
488	+	public void realRun() {
489	+	lock.readLock().lock();
490	+	lock.readLock().unlock();
491	+	}});
492	+
493	+	lock.readLock().lock();
494	+	lock.readLock().unlock();
495	+	Thread.sleep(SHORT_DELAY_MS);
496	+	lock.readLock().lock();
497	+	lock.readLock().unlock();
498	+	lock.writeLock().unlock();
499	+	t1.join(MEDIUM_DELAY_MS);
500	+	t2.join(MEDIUM_DELAY_MS);
501	+	assertTrue(!t1.isAlive());
502	+	assertTrue(!t2.isAlive());
503	+	}
504	+
505	+
506	+	/**
507	+	* Fair Read lock succeeds if write locked by current thread even if
508	+	* other threads are waiting for writelock
509	+	*/
510	+	public void testReadHoldingWriteLockFair3() throws InterruptedException {
511	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
512	+	lock.writeLock().lock();
513	+	Thread t1 = newStartedThread(new CheckedRunnable() {
514	+	public void realRun() {
515	+	lock.writeLock().lock();
516	+	lock.writeLock().unlock();
517	+	}});
518	+	Thread t2 = newStartedThread(new CheckedRunnable() {
519	+	public void realRun() {
520	+	lock.writeLock().lock();
521	+	lock.writeLock().unlock();
522	+	}});
523	+
524	+	lock.readLock().lock();
525	+	lock.readLock().unlock();
526	+	Thread.sleep(SHORT_DELAY_MS);
527	+	lock.readLock().lock();
528	+	lock.readLock().unlock();
529	+	lock.writeLock().unlock();
530	+	t1.join(MEDIUM_DELAY_MS);
531	+	t2.join(MEDIUM_DELAY_MS);
532	+	assertTrue(!t1.isAlive());
533	+	assertTrue(!t2.isAlive());
534	+	}
535
536	<	private static long SHORT_DELAY_MS = 100;
537	<	private static long MEDIUM_DELAY_MS = 1000;
538	<	private static long LONG_DELAY_MS = 10000;
539	<
540	<	/*
541	<	* Unlocks an unlocked lock, throws Illegal Monitor State
542	<	*
543	<	*/
544	<
545	<	public void testIllegalMonitorStateException(){
546	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
547	<	try{
548	<	rl.writeLock().unlock();
549	<	fail("Should of thown Illegal Monitor State Exception");
550	<
551	<	}catch(IllegalMonitorStateException sucess){}
552	<
553	<
554	<	}
555	<
556	<	/*
557	<	* makes a lock, locks it, tries to aquire the lock in another thread
558	<	* interrupts that thread and waits for an interrupted Exception to
559	<	* be thrown.
560	<	*/
561	<
562	<	public void testInterruptedException(){
563	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
564	<	lock.writeLock().lock();
565	<	Thread t = new Thread(new Runnable() {
566	<	public void run(){
567	<	try{
568	<	lock.writeLock().lockInterruptibly();
569	<	fail("should throw");
570	<	}catch(InterruptedException sucess){}
571	<	}
572	<	});
573	<	t.start();
574	<	t.interrupt();
575	<	lock.writeLock().unlock();
576	<	}
577	<
578	<	/*
579	<	* tests for interrupted exception on a timed wait
580	<	*
581	<	*/
582	<
583	<
584	<	public void testInterruptedException2(){
585	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
586	<	lock.writeLock().lock();
587	<	Thread t = new Thread(new Runnable() {
588	<	public void run(){
589	<	try{
590	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
591	<	fail("should throw");
592	<	}catch(InterruptedException sucess){}
593	<	}
594	<	});
595	<	t.start();
596	<	t.interrupt();
597	<	}
598	<
599	<
600	<
601	<	/*
602	<	* current thread locks interruptibly the thread
603	<	* another thread tries to aquire the lock and blocks
604	<	* on the call. interrupt the attempted aquireLock
605	<	* assert that the first lock() call actually locked the lock
606	<	* assert that the current thread is the one holding the lock
607	<	*/
608	<
609	<	public void testLockedInterruptibly() {
610	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
611	<	try {lock.writeLock().lockInterruptibly();} catch(Exception e) {}
612	<	Thread t = new Thread(new Runnable() {
613	<	public void run() {
614	<	try {
615	<	lock.writeLock().lockInterruptibly();
616	<	fail("Failed to generate an Interrupted Exception");
617	<	}
618	<	catch(InterruptedException e) {}
619	<	}
620	<	});
621	<	t.start();
622	<	t.interrupt();
536	>
537	>	/**
538	>	* Fair Write lock succeeds if write locked by current thread even if
539	>	* other threads are waiting for writelock
540	>	*/
541	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
542	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
543	>	lock.writeLock().lock();
544	>	Thread t1 = newStartedThread(new CheckedRunnable() {
545	>	public void realRun() {
546	>	lock.writeLock().lock();
547	>	lock.writeLock().unlock();
548	>	}});
549	>	Thread t2 = newStartedThread(new CheckedRunnable() {
550	>	public void realRun() {
551	>	lock.writeLock().lock();
552	>	lock.writeLock().unlock();
553	>	}});
554	>
555	>	Thread.sleep(SHORT_DELAY_MS);
556	>	assertTrue(lock.isWriteLockedByCurrentThread());
557	>	assertEquals(1, lock.getWriteHoldCount());
558	>	lock.writeLock().lock();
559	>	assertEquals(2, lock.getWriteHoldCount());
560	>	lock.writeLock().unlock();
561	>	lock.writeLock().lock();
562	>	lock.writeLock().unlock();
563	>	lock.writeLock().unlock();
564	>	t1.join(MEDIUM_DELAY_MS);
565	>	t2.join(MEDIUM_DELAY_MS);
566	>	assertTrue(!t1.isAlive());
567	>	assertTrue(!t2.isAlive());
568	>	}
569	>
570	>
571	>	/**
572	>	* Read tryLock succeeds if readlocked but not writelocked
573	>	*/
574	>	public void testTryLockWhenReadLocked() throws InterruptedException {
575	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
576	>	lock.readLock().lock();
577	>	Thread t = newStartedThread(new CheckedRunnable() {
578	>	public void realRun() {
579	>	assertTrue(lock.readLock().tryLock());
580	>	lock.readLock().unlock();
581	>	}});
582	>
583	>	t.join();
584	>	lock.readLock().unlock();
585	>	}
586	>
587	>	/**
588	>	* write tryLock fails when readlocked
589	>	*/
590	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
591	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
592	>	lock.readLock().lock();
593	>	Thread t = newStartedThread(new CheckedRunnable() {
594	>	public void realRun() {
595	>	assertFalse(lock.writeLock().tryLock());
596	>	}});
597	>
598	>	t.join();
599	>	lock.readLock().unlock();
600	>	}
601	>
602	>
603	>	/**
604	>	* Fair Read tryLock succeeds if readlocked but not writelocked
605	>	*/
606	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
607	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
608	>	lock.readLock().lock();
609	>	Thread t = newStartedThread(new CheckedRunnable() {
610	>	public void realRun() {
611	>	assertTrue(lock.readLock().tryLock());
612	>	lock.readLock().unlock();
613	>	}});
614	>
615	>	t.join();
616	>	lock.readLock().unlock();
617	>	}
618	>
619	>
620	>
621	>	/**
622	>	* Fair write tryLock fails when readlocked
623	>	*/
624	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
625	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
626	>	lock.readLock().lock();
627	>	Thread t = newStartedThread(new CheckedRunnable() {
628	>	public void realRun() {
629	>	assertFalse(lock.writeLock().tryLock());
630	>	}});
631	>
632	>	t.join();
633	>	lock.readLock().unlock();
634	>	}
635	>
636	>
637	>
638	>	/**
639	>	* write timed tryLock times out if locked
640	>	*/
641	>	public void testWriteTryLock_Timeout() throws InterruptedException {
642	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
643	>	lock.writeLock().lock();
644	>	Thread t = newStartedThread(new CheckedRunnable() {
645	>	public void realRun() throws InterruptedException {
646	>	assertFalse(lock.writeLock().tryLock(1, MILLISECONDS));
647	>	}});
648	>
649	>	t.join();
650	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
651	>	lock.writeLock().unlock();
652	>	}
653	>
654	>	/**
655	>	* read timed tryLock times out if write-locked
656	>	*/
657	>	public void testReadTryLock_Timeout() throws InterruptedException {
658	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
659	>	lock.writeLock().lock();
660	>	Thread t = newStartedThread(new CheckedRunnable() {
661	>	public void realRun() throws InterruptedException {
662	>	assertFalse(lock.readLock().tryLock(1, MILLISECONDS));
663	>	}});
664	>
665	>	t.join();
666	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
667	>	lock.writeLock().unlock();
668	>	}
669	>
670	>
671	>	/**
672	>	* write lockInterruptibly succeeds if lock free else is interruptible
673	>	*/
674	>	public void testWriteLockInterruptibly() throws InterruptedException {
675	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
676	>	lock.writeLock().lockInterruptibly();
677	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
678	>	public void realRun() throws InterruptedException {
679	>	lock.writeLock().lockInterruptibly();
680	>	}});
681	>
682	>	Thread.sleep(SHORT_DELAY_MS);
683	>	t.interrupt();
684	>	Thread.sleep(SHORT_DELAY_MS);
685	>	t.join();
686	>	lock.writeLock().unlock();
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	>	lock.writeLock().unlock();
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	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
850	>	public void realRun() throws InterruptedException {
851	>	lock.writeLock().lock();
852	>	c.await();
853	>	lock.writeLock().unlock();
854	>	}});
855	>
856	>	Thread.sleep(SHORT_DELAY_MS);
857	>	t.interrupt();
858	>	t.join(SHORT_DELAY_MS);
859	>	assertFalse(t.isAlive());
860	>	}
861	>
862	>	/**
863	>	* awaitNanos is interruptible
864	>	*/
865	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
866	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
867	>	final Condition c = lock.writeLock().newCondition();
868	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
869	>	public void realRun() throws InterruptedException {
870	>	lock.writeLock().lock();
871	>	c.awaitNanos(MILLISECONDS.toNanos(LONG_DELAY_MS));
872	>	lock.writeLock().unlock();
873	>	}});
874	>
875	>	Thread.sleep(SHORT_DELAY_MS);
876	>	t.interrupt();
877	>	t.join(SHORT_DELAY_MS);
878	>	assertFalse(t.isAlive());
879	>	}
880	>
881	>	/**
882	>	* awaitUntil is interruptible
883	>	*/
884	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
885	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
886	>	final Condition c = lock.writeLock().newCondition();
887	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
888	>	public void realRun() throws InterruptedException {
889	>	lock.writeLock().lock();
890	>	java.util.Date d = new java.util.Date();
891	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
892	>	lock.writeLock().unlock();
893	>	}});
894	>
895	>	Thread.sleep(SHORT_DELAY_MS);
896	>	t.interrupt();
897	>	t.join(SHORT_DELAY_MS);
898	>	assertFalse(t.isAlive());
899	>	}
900	>
901	>	/**
902	>	* signalAll wakes up all threads
903	>	*/
904	>	public void testSignalAll() throws InterruptedException {
905	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
906	>	final Condition c = lock.writeLock().newCondition();
907	>	Thread t1 = newStartedThread(new CheckedRunnable() {
908	>	public void realRun() throws InterruptedException {
909	>	lock.writeLock().lock();
910	>	c.await();
911	>	lock.writeLock().unlock();
912	>	}});
913	>
914	>	Thread t2 = newStartedThread(new CheckedRunnable() {
915	>	public void realRun() throws InterruptedException {
916	>	lock.writeLock().lock();
917	>	c.await();
918	>	lock.writeLock().unlock();
919	>	}});
920	>
921	>	Thread.sleep(SHORT_DELAY_MS);
922	>	lock.writeLock().lock();
923	>	c.signalAll();
924	>	lock.writeLock().unlock();
925	>	t1.join(SHORT_DELAY_MS);
926	>	t2.join(SHORT_DELAY_MS);
927	>	assertFalse(t1.isAlive());
928	>	assertFalse(t2.isAlive());
929	>	}
930	>
931	>	/**
932	>	* A serialized lock deserializes as unlocked
933	>	*/
934	>	public void testSerialization() throws Exception {
935	>	ReentrantReadWriteLock l = new ReentrantReadWriteLock();
936	>	l.readLock().lock();
937	>	l.readLock().unlock();
938	>
939	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
940	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
941	>	out.writeObject(l);
942	>	out.close();
943	>
944	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
945	>	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
946	>	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
947	>	r.readLock().lock();
948	>	r.readLock().unlock();
949	>	}
950	>
951	>	/**
952	>	* hasQueuedThreads reports whether there are waiting threads
953	>	*/
954	>	public void testhasQueuedThreads() throws InterruptedException {
955	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
956	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
957	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
958	>	assertFalse(lock.hasQueuedThreads());
959	>	lock.writeLock().lock();
960	>	t1.start();
961	>	Thread.sleep(SHORT_DELAY_MS);
962	>	assertTrue(lock.hasQueuedThreads());
963	>	t2.start();
964	>	Thread.sleep(SHORT_DELAY_MS);
965	>	assertTrue(lock.hasQueuedThreads());
966	>	t1.interrupt();
967	>	Thread.sleep(SHORT_DELAY_MS);
968	>	assertTrue(lock.hasQueuedThreads());
969	>	lock.writeLock().unlock();
970	>	Thread.sleep(SHORT_DELAY_MS);
971	>	assertFalse(lock.hasQueuedThreads());
972	>	t1.join();
973	>	t2.join();
974	>	}
975	>
976	>	/**
977	>	* hasQueuedThread(null) throws NPE
978	>	*/
979	>	public void testHasQueuedThreadNPE() {
980	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
981	>	try {
982	>	sync.hasQueuedThread(null);
983	>	shouldThrow();
984	>	} catch (NullPointerException success) {}
985	>	}
986	>
987	>	/**
988	>	* hasQueuedThread reports whether a thread is queued.
989	>	*/
990	>	public void testHasQueuedThread() throws InterruptedException {
991	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
992	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
993	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
994	>	assertFalse(sync.hasQueuedThread(t1));
995	>	assertFalse(sync.hasQueuedThread(t2));
996	>	sync.writeLock().lock();
997	>	t1.start();
998	>	Thread.sleep(SHORT_DELAY_MS);
999	>	assertTrue(sync.hasQueuedThread(t1));
1000	>	t2.start();
1001	>	Thread.sleep(SHORT_DELAY_MS);
1002	>	assertTrue(sync.hasQueuedThread(t1));
1003	>	assertTrue(sync.hasQueuedThread(t2));
1004	>	t1.interrupt();
1005	>	Thread.sleep(SHORT_DELAY_MS);
1006	>	assertFalse(sync.hasQueuedThread(t1));
1007	>	assertTrue(sync.hasQueuedThread(t2));
1008	>	sync.writeLock().unlock();
1009	>	Thread.sleep(SHORT_DELAY_MS);
1010	>	assertFalse(sync.hasQueuedThread(t1));
1011	>	Thread.sleep(SHORT_DELAY_MS);
1012	>	assertFalse(sync.hasQueuedThread(t2));
1013	>	t1.join();
1014	>	t2.join();
1015	>	}
1016	>
1017	>
1018	>	/**
1019	>	* getQueueLength reports number of waiting threads
1020	>	*/
1021	>	public void testGetQueueLength() throws InterruptedException {
1022	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1023	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1024	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1025	>	assertEquals(0, lock.getQueueLength());
1026	>	lock.writeLock().lock();
1027	>	t1.start();
1028	>	Thread.sleep(SHORT_DELAY_MS);
1029	>	assertEquals(1, lock.getQueueLength());
1030	>	t2.start();
1031	>	Thread.sleep(SHORT_DELAY_MS);
1032	>	assertEquals(2, lock.getQueueLength());
1033	>	t1.interrupt();
1034	>	Thread.sleep(SHORT_DELAY_MS);
1035	>	assertEquals(1, lock.getQueueLength());
1036	>	lock.writeLock().unlock();
1037	>	Thread.sleep(SHORT_DELAY_MS);
1038	>	assertEquals(0, lock.getQueueLength());
1039	>	t1.join();
1040	>	t2.join();
1041	>	}
1042	>
1043	>	/**
1044	>	* getQueuedThreads includes waiting threads
1045	>	*/
1046	>	public void testGetQueuedThreads() throws InterruptedException {
1047	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1048	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1049	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1050	>	assertTrue(lock.getQueuedThreads().isEmpty());
1051	>	lock.writeLock().lock();
1052	>	assertTrue(lock.getQueuedThreads().isEmpty());
1053	>	t1.start();
1054	>	Thread.sleep(SHORT_DELAY_MS);
1055	>	assertTrue(lock.getQueuedThreads().contains(t1));
1056	>	t2.start();
1057	>	Thread.sleep(SHORT_DELAY_MS);
1058	>	assertTrue(lock.getQueuedThreads().contains(t1));
1059	>	assertTrue(lock.getQueuedThreads().contains(t2));
1060	>	t1.interrupt();
1061	>	Thread.sleep(SHORT_DELAY_MS);
1062	>	assertFalse(lock.getQueuedThreads().contains(t1));
1063	>	assertTrue(lock.getQueuedThreads().contains(t2));
1064	>	lock.writeLock().unlock();
1065	>	Thread.sleep(SHORT_DELAY_MS);
1066	>	assertTrue(lock.getQueuedThreads().isEmpty());
1067	>	t1.join();
1068	>	t2.join();
1069	>	}
1070	>
1071	>	/**
1072	>	* hasWaiters throws NPE if null
1073	>	*/
1074	>	public void testHasWaitersNPE() {
1075	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1076	>	try {
1077	>	lock.hasWaiters(null);
1078	>	shouldThrow();
1079	>	} catch (NullPointerException success) {}
1080	>	}
1081	>
1082	>	/**
1083	>	* getWaitQueueLength throws NPE if null
1084	>	*/
1085	>	public void testGetWaitQueueLengthNPE() {
1086	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1087	>	try {
1088	>	lock.getWaitQueueLength(null);
1089	>	shouldThrow();
1090	>	} catch (NullPointerException success) {}
1091	>	}
1092	>
1093	>
1094	>	/**
1095	>	* getWaitingThreads throws NPE if null
1096	>	*/
1097	>	public void testGetWaitingThreadsNPE() {
1098	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1099	>	try {
1100	>	lock.getWaitingThreads(null);
1101	>	shouldThrow();
1102	>	} catch (NullPointerException success) {}
1103	>	}
1104	>
1105	>	/**
1106	>	* hasWaiters throws IAE if not owned
1107	>	*/
1108	>	public void testHasWaitersIAE() {
1109	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1110	>	final Condition c = lock.writeLock().newCondition();
1111	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1112	>	try {
1113	>	lock2.hasWaiters(c);
1114	>	shouldThrow();
1115	>	} catch (IllegalArgumentException success) {}
1116	>	}
1117	>
1118	>	/**
1119	>	* hasWaiters throws IMSE if not locked
1120	>	*/
1121	>	public void testHasWaitersIMSE() {
1122	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1123	>	final Condition c = lock.writeLock().newCondition();
1124	>	try {
1125	>	lock.hasWaiters(c);
1126	>	shouldThrow();
1127	>	} catch (IllegalMonitorStateException success) {}
1128	>	}
1129	>
1130	>
1131	>	/**
1132	>	* getWaitQueueLength throws IAE if not owned
1133	>	*/
1134	>	public void testGetWaitQueueLengthIAE() {
1135	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1136	>	final Condition c = lock.writeLock().newCondition();
1137	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1138	>	try {
1139	>	lock2.getWaitQueueLength(c);
1140	>	shouldThrow();
1141	>	} catch (IllegalArgumentException success) {}
1142	>	}
1143	>
1144	>	/**
1145	>	* getWaitQueueLength throws IMSE if not locked
1146	>	*/
1147	>	public void testGetWaitQueueLengthIMSE() {
1148	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1149	>	final Condition c = lock.writeLock().newCondition();
1150	>	try {
1151	>	lock.getWaitQueueLength(c);
1152	>	shouldThrow();
1153	>	} catch (IllegalMonitorStateException success) {}
1154	>	}
1155	>
1156	>
1157	>	/**
1158	>	* getWaitingThreads throws IAE if not owned
1159	>	*/
1160	>	public void testGetWaitingThreadsIAE() {
1161	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1162	>	final Condition c = lock.writeLock().newCondition();
1163	>	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1164	>	try {
1165	>	lock2.getWaitingThreads(c);
1166	>	shouldThrow();
1167	>	} catch (IllegalArgumentException success) {}
1168	>	}
1169	>
1170	>	/**
1171	>	* getWaitingThreads throws IMSE if not locked
1172	>	*/
1173	>	public void testGetWaitingThreadsIMSE() {
1174	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1175	>	final Condition c = lock.writeLock().newCondition();
1176	>	try {
1177	>	lock.getWaitingThreads(c);
1178	>	shouldThrow();
1179	>	} catch (IllegalMonitorStateException success) {}
1180	>	}
1181	>
1182	>
1183	>	/**
1184	>	* hasWaiters returns true when a thread is waiting, else false
1185	>	*/
1186	>	public void testHasWaiters() throws InterruptedException {
1187	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1188	>	final Condition c = lock.writeLock().newCondition();
1189	>	Thread t = newStartedThread(new CheckedRunnable() {
1190	>	public void realRun() throws InterruptedException {
1191	>	lock.writeLock().lock();
1192	>	assertFalse(lock.hasWaiters(c));
1193	>	assertEquals(0, lock.getWaitQueueLength(c));
1194	>	c.await();
1195	>	lock.writeLock().unlock();
1196	>	}});
1197	>
1198	>	Thread.sleep(SHORT_DELAY_MS);
1199	>	lock.writeLock().lock();
1200	>	assertTrue(lock.hasWaiters(c));
1201	>	assertEquals(1, lock.getWaitQueueLength(c));
1202	>	c.signal();
1203	>	lock.writeLock().unlock();
1204	>	Thread.sleep(SHORT_DELAY_MS);
1205	>	lock.writeLock().lock();
1206	>	assertFalse(lock.hasWaiters(c));
1207	>	assertEquals(0, lock.getWaitQueueLength(c));
1208	>	lock.writeLock().unlock();
1209	>	t.join(SHORT_DELAY_MS);
1210	>	assertFalse(t.isAlive());
1211	>	}
1212	>
1213	>	/**
1214	>	* getWaitQueueLength returns number of waiting threads
1215	>	*/
1216	>	public void testGetWaitQueueLength() throws InterruptedException {
1217	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1218	>	final Condition c = lock.writeLock().newCondition();
1219	>	Thread t = newStartedThread(new CheckedRunnable() {
1220	>	public void realRun() throws InterruptedException {
1221	>	lock.writeLock().lock();
1222	>	assertFalse(lock.hasWaiters(c));
1223	>	assertEquals(0, lock.getWaitQueueLength(c));
1224	>	c.await();
1225	>	lock.writeLock().unlock();
1226	>	}});
1227	>
1228	>	Thread.sleep(SHORT_DELAY_MS);
1229	>	lock.writeLock().lock();
1230	>	assertTrue(lock.hasWaiters(c));
1231	>	assertEquals(1, lock.getWaitQueueLength(c));
1232	>	c.signal();
1233	>	lock.writeLock().unlock();
1234	>	Thread.sleep(SHORT_DELAY_MS);
1235	>	lock.writeLock().lock();
1236	>	assertFalse(lock.hasWaiters(c));
1237	>	assertEquals(0, lock.getWaitQueueLength(c));
1238	>	lock.writeLock().unlock();
1239	>	t.join(SHORT_DELAY_MS);
1240	>	assertFalse(t.isAlive());
1241	>	}
1242	>
1243	>
1244	>	/**
1245	>	* getWaitingThreads returns only and all waiting threads
1246	>	*/
1247	>	public void testGetWaitingThreads() throws InterruptedException {
1248	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1249	>	final Condition c = lock.writeLock().newCondition();
1250	>	Thread t1 = new Thread(new CheckedRunnable() {
1251	>	public void realRun() throws InterruptedException {
1252	>	lock.writeLock().lock();
1253	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1254	>	c.await();
1255	>	lock.writeLock().unlock();
1256	>	}});
1257	>
1258	>	Thread t2 = new Thread(new CheckedRunnable() {
1259	>	public void realRun() throws InterruptedException {
1260	>	lock.writeLock().lock();
1261	>	assertFalse(lock.getWaitingThreads(c).isEmpty());
1262	>	c.await();
1263	>	lock.writeLock().unlock();
1264	>	}});
1265	>
1266	>	lock.writeLock().lock();
1267	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1268	>	lock.writeLock().unlock();
1269	>	t1.start();
1270	>	Thread.sleep(SHORT_DELAY_MS);
1271	>	t2.start();
1272	>	Thread.sleep(SHORT_DELAY_MS);
1273	>	lock.writeLock().lock();
1274	>	assertTrue(lock.hasWaiters(c));
1275	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
1276	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
1277	>	c.signalAll();
1278	>	lock.writeLock().unlock();
1279	>	Thread.sleep(SHORT_DELAY_MS);
1280	>	lock.writeLock().lock();
1281	>	assertFalse(lock.hasWaiters(c));
1282	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1283	>	lock.writeLock().unlock();
1284	>	t1.join(SHORT_DELAY_MS);
1285	>	t2.join(SHORT_DELAY_MS);
1286	>	assertFalse(t1.isAlive());
1287	>	assertFalse(t2.isAlive());
1288	>	}
1289	>
1290	>	/**
1291	>	* toString indicates current lock state
1292	>	*/
1293	>	public void testToString() {
1294	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1295	>	String us = lock.toString();
1296	>	assertTrue(us.indexOf("Write locks = 0") >= 0);
1297	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1298	>	lock.writeLock().lock();
1299	>	String ws = lock.toString();
1300	>	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1301	>	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1302	>	lock.writeLock().unlock();
1303	>	lock.readLock().lock();
1304	>	lock.readLock().lock();
1305	>	String rs = lock.toString();
1306	>	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1307	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1308	>	}
1309	>
1310	>	/**
1311	>	* readLock.toString indicates current lock state
1312	>	*/
1313	>	public void testReadLockToString() {
1314	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1315	>	String us = lock.readLock().toString();
1316	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1317	>	lock.readLock().lock();
1318	>	lock.readLock().lock();
1319	>	String rs = lock.readLock().toString();
1320	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1321	>	}
1322	>
1323	>	/**
1324	>	* writeLock.toString indicates current lock state
1325	>	*/
1326	>	public void testWriteLockToString() {
1327	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1328	>	String us = lock.writeLock().toString();
1329	>	assertTrue(us.indexOf("Unlocked") >= 0);
1330	>	lock.writeLock().lock();
1331	>	String ls = lock.writeLock().toString();
1332	>	assertTrue(ls.indexOf("Locked") >= 0);
1333		}
112	–
1334
1335		}

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