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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 1.46 by jsr166, Mon May 2 00:03:34 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	+	lock.writeLock().unlock();
228	+	t.join();
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	+	Thread.sleep(SHORT_DELAY_MS);
245	+	lock.writeLock().unlock();
246	+	t.join();
247	+	}
248	+
249	+	/**
250	+	* timed read-tryLock is interruptible
251	+	*/
252	+	public void testReadTryLock_Interrupted() throws InterruptedException {
253	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
254	+	lock.writeLock().lock();
255	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
256	+	public void realRun() throws InterruptedException {
257	+	lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS);
258	+	}});
259	+
260	+	Thread.sleep(SHORT_DELAY_MS);
261	+	t.interrupt();
262	+	t.join();
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	>	Thread.sleep(SHORT_DELAY_MS);
686	>	t.join();
687	>	lock.writeLock().unlock();
688	>	}
689	>
690	>	/**
691	>	* read lockInterruptibly succeeds if lock free else is interruptible
692	>	*/
693	>	public void testReadLockInterruptibly() throws InterruptedException {
694	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
695	>	lock.writeLock().lockInterruptibly();
696	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
697	>	public void realRun() throws InterruptedException {
698	>	lock.readLock().lockInterruptibly();
699	>	}});
700	>
701	>	Thread.sleep(SHORT_DELAY_MS);
702	>	t.interrupt();
703	>	t.join();
704	>	lock.writeLock().unlock();
705	>	}
706	>
707	>	/**
708	>	* Calling await without holding lock throws IllegalMonitorStateException
709	>	*/
710	>	public void testAwait_IllegalMonitor() throws InterruptedException {
711	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
712	>	final Condition c = lock.writeLock().newCondition();
713	>	try {
714	>	c.await();
715	>	shouldThrow();
716	>	} catch (IllegalMonitorStateException success) {}
717	>	}
718	>
719	>	/**
720	>	* Calling signal without holding lock throws IllegalMonitorStateException
721	>	*/
722	>	public void testSignal_IllegalMonitor() {
723	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
724	>	final Condition c = lock.writeLock().newCondition();
725	>	try {
726	>	c.signal();
727	>	shouldThrow();
728	>	} catch (IllegalMonitorStateException success) {}
729	>	}
730	>
731	>	/**
732	>	* awaitNanos without a signal times out
733	>	*/
734	>	public void testAwaitNanos_Timeout() throws InterruptedException {
735	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
736	>	final Condition c = lock.writeLock().newCondition();
737	>
738	>	lock.writeLock().lock();
739	>	long t = c.awaitNanos(100);
740	>	assertTrue(t <= 0);
741	>	lock.writeLock().unlock();
742	>	}
743	>
744	>
745	>	/**
746	>	* timed await without a signal times out
747	>	*/
748	>	public void testAwait_Timeout() throws InterruptedException {
749	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
750	>	final Condition c = lock.writeLock().newCondition();
751	>	lock.writeLock().lock();
752	>	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
753	>	lock.writeLock().unlock();
754	>	}
755	>
756	>	/**
757	>	* awaitUntil without a signal times out
758	>	*/
759	>	public void testAwaitUntil_Timeout() throws InterruptedException {
760	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
761	>	final Condition c = lock.writeLock().newCondition();
762	>	lock.writeLock().lock();
763	>	java.util.Date d = new java.util.Date();
764	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
765	>	lock.writeLock().unlock();
766	>	}
767	>
768	>	/**
769	>	* await returns when signalled
770	>	*/
771	>	public void testAwait() throws InterruptedException {
772	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
773	>	final Condition c = lock.writeLock().newCondition();
774	>	Thread t = newStartedThread(new CheckedRunnable() {
775	>	public void realRun() throws InterruptedException {
776	>	lock.writeLock().lock();
777	>	c.await();
778	>	lock.writeLock().unlock();
779	>	}});
780	>
781	>	Thread.sleep(SHORT_DELAY_MS);
782	>	lock.writeLock().lock();
783	>	c.signal();
784	>	lock.writeLock().unlock();
785	>	t.join(SHORT_DELAY_MS);
786	>	assertFalse(t.isAlive());
787	>	}
788	>
789	>	/** A helper class for uninterruptible wait tests */
790	>	class UninterruptableThread extends Thread {
791	>	private Lock lock;
792	>	private Condition c;
793	>
794	>	public volatile boolean canAwake = false;
795	>	public volatile boolean interrupted = false;
796	>	public volatile boolean lockStarted = false;
797	>
798	>	public UninterruptableThread(Lock lock, Condition c) {
799	>	this.lock = lock;
800	>	this.c = c;
801	>	}
802	>
803	>	public synchronized void run() {
804	>	lock.lock();
805	>	lockStarted = true;
806	>
807	>	while (!canAwake) {
808	>	c.awaitUninterruptibly();
809	>	}
810	>
811	>	interrupted = isInterrupted();
812	>	lock.unlock();
813	>	}
814	>	}
815	>
816	>	/**
817	>	* awaitUninterruptibly doesn't abort on interrupt
818	>	*/
819	>	public void testAwaitUninterruptibly() throws InterruptedException {
820	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
821	>	final Condition c = lock.writeLock().newCondition();
822	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
823	>
824	>	thread.start();
825	>
826	>	while (!thread.lockStarted) {
827	>	Thread.sleep(100);
828	>	}
829	>
830	>	lock.writeLock().lock();
831	>	try {
832	>	thread.interrupt();
833	>	thread.canAwake = true;
834	>	c.signal();
835	>	} finally {
836	>	lock.writeLock().unlock();
837	>	}
838	>
839	>	thread.join();
840	>	assertTrue(thread.interrupted);
841	>	assertFalse(thread.isAlive());
842	>	}
843	>
844	>	/**
845	>	* await is interruptible
846	>	*/
847	>	public void testAwait_Interrupt() throws InterruptedException {
848	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
849	>	final Condition c = lock.writeLock().newCondition();
850	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
851	>	public void realRun() throws InterruptedException {
852	>	lock.writeLock().lock();
853	>	c.await();
854	>	lock.writeLock().unlock();
855	>	}});
856	>
857	>	Thread.sleep(SHORT_DELAY_MS);
858	>	t.interrupt();
859	>	t.join(SHORT_DELAY_MS);
860	>	assertFalse(t.isAlive());
861	>	}
862	>
863	>	/**
864	>	* awaitNanos is interruptible
865	>	*/
866	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
867	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
868	>	final Condition c = lock.writeLock().newCondition();
869	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
870	>	public void realRun() throws InterruptedException {
871	>	lock.writeLock().lock();
872	>	c.awaitNanos(MILLISECONDS.toNanos(LONG_DELAY_MS));
873	>	lock.writeLock().unlock();
874	>	}});
875	>
876	>	Thread.sleep(SHORT_DELAY_MS);
877	>	t.interrupt();
878	>	t.join(SHORT_DELAY_MS);
879	>	assertFalse(t.isAlive());
880	>	}
881	>
882	>	/**
883	>	* awaitUntil is interruptible
884	>	*/
885	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
886	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
887	>	final Condition c = lock.writeLock().newCondition();
888	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
889	>	public void realRun() throws InterruptedException {
890	>	lock.writeLock().lock();
891	>	java.util.Date d = new java.util.Date();
892	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
893	>	lock.writeLock().unlock();
894	>	}});
895	>
896	>	Thread.sleep(SHORT_DELAY_MS);
897	>	t.interrupt();
898	>	t.join(SHORT_DELAY_MS);
899	>	assertFalse(t.isAlive());
900	>	}
901	>
902	>	/**
903	>	* signalAll wakes up all threads
904	>	*/
905	>	public void testSignalAll() throws InterruptedException {
906	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
907	>	final Condition c = lock.writeLock().newCondition();
908	>	Thread t1 = newStartedThread(new CheckedRunnable() {
909	>	public void realRun() throws InterruptedException {
910	>	lock.writeLock().lock();
911	>	c.await();
912	>	lock.writeLock().unlock();
913	>	}});
914	>
915	>	Thread t2 = newStartedThread(new CheckedRunnable() {
916	>	public void realRun() throws InterruptedException {
917	>	lock.writeLock().lock();
918	>	c.await();
919	>	lock.writeLock().unlock();
920	>	}});
921	>
922	>	Thread.sleep(SHORT_DELAY_MS);
923	>	lock.writeLock().lock();
924	>	c.signalAll();
925	>	lock.writeLock().unlock();
926	>	t1.join(SHORT_DELAY_MS);
927	>	t2.join(SHORT_DELAY_MS);
928	>	assertFalse(t1.isAlive());
929	>	assertFalse(t2.isAlive());
930	>	}
931	>
932	>	/**
933	>	* A serialized lock deserializes as unlocked
934	>	*/
935	>	public void testSerialization() throws Exception {
936	>	ReentrantReadWriteLock l = new ReentrantReadWriteLock();
937	>	l.readLock().lock();
938	>	l.readLock().unlock();
939	>
940	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
941	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
942	>	out.writeObject(l);
943	>	out.close();
944	>
945	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
946	>	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
947	>	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
948	>	r.readLock().lock();
949	>	r.readLock().unlock();
950	>	}
951	>
952	>	/**
953	>	* hasQueuedThreads reports whether there are waiting threads
954	>	*/
955	>	public void testhasQueuedThreads() throws InterruptedException {
956	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
957	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
958	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
959	>	assertFalse(lock.hasQueuedThreads());
960	>	lock.writeLock().lock();
961	>	t1.start();
962	>	Thread.sleep(SHORT_DELAY_MS);
963	>	assertTrue(lock.hasQueuedThreads());
964	>	t2.start();
965	>	Thread.sleep(SHORT_DELAY_MS);
966	>	assertTrue(lock.hasQueuedThreads());
967	>	t1.interrupt();
968	>	Thread.sleep(SHORT_DELAY_MS);
969	>	assertTrue(lock.hasQueuedThreads());
970	>	lock.writeLock().unlock();
971	>	Thread.sleep(SHORT_DELAY_MS);
972	>	assertFalse(lock.hasQueuedThreads());
973	>	t1.join();
974	>	t2.join();
975	>	}
976	>
977	>	/**
978	>	* hasQueuedThread(null) throws NPE
979	>	*/
980	>	public void testHasQueuedThreadNPE() {
981	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
982	>	try {
983	>	sync.hasQueuedThread(null);
984	>	shouldThrow();
985	>	} catch (NullPointerException success) {}
986	>	}
987	>
988	>	/**
989	>	* hasQueuedThread reports whether a thread is queued.
990	>	*/
991	>	public void testHasQueuedThread() throws InterruptedException {
992	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
993	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
994	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
995	>	assertFalse(sync.hasQueuedThread(t1));
996	>	assertFalse(sync.hasQueuedThread(t2));
997	>	sync.writeLock().lock();
998	>	t1.start();
999	>	Thread.sleep(SHORT_DELAY_MS);
1000	>	assertTrue(sync.hasQueuedThread(t1));
1001	>	t2.start();
1002	>	Thread.sleep(SHORT_DELAY_MS);
1003	>	assertTrue(sync.hasQueuedThread(t1));
1004	>	assertTrue(sync.hasQueuedThread(t2));
1005	>	t1.interrupt();
1006	>	Thread.sleep(SHORT_DELAY_MS);
1007	>	assertFalse(sync.hasQueuedThread(t1));
1008	>	assertTrue(sync.hasQueuedThread(t2));
1009	>	sync.writeLock().unlock();
1010	>	Thread.sleep(SHORT_DELAY_MS);
1011	>	assertFalse(sync.hasQueuedThread(t1));
1012	>	Thread.sleep(SHORT_DELAY_MS);
1013	>	assertFalse(sync.hasQueuedThread(t2));
1014	>	t1.join();
1015	>	t2.join();
1016	>	}
1017	>
1018	>
1019	>	/**
1020	>	* getQueueLength reports number of waiting threads
1021	>	*/
1022	>	public void testGetQueueLength() throws InterruptedException {
1023	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1024	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1025	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1026	>	assertEquals(0, lock.getQueueLength());
1027	>	lock.writeLock().lock();
1028	>	t1.start();
1029	>	Thread.sleep(SHORT_DELAY_MS);
1030	>	assertEquals(1, lock.getQueueLength());
1031	>	t2.start();
1032	>	Thread.sleep(SHORT_DELAY_MS);
1033	>	assertEquals(2, lock.getQueueLength());
1034	>	t1.interrupt();
1035	>	Thread.sleep(SHORT_DELAY_MS);
1036	>	assertEquals(1, lock.getQueueLength());
1037	>	lock.writeLock().unlock();
1038	>	Thread.sleep(SHORT_DELAY_MS);
1039	>	assertEquals(0, lock.getQueueLength());
1040	>	t1.join();
1041	>	t2.join();
1042	>	}
1043	>
1044	>	/**
1045	>	* getQueuedThreads includes waiting threads
1046	>	*/
1047	>	public void testGetQueuedThreads() throws InterruptedException {
1048	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1049	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1050	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1051	>	assertTrue(lock.getQueuedThreads().isEmpty());
1052	>	lock.writeLock().lock();
1053	>	assertTrue(lock.getQueuedThreads().isEmpty());
1054	>	t1.start();
1055	>	Thread.sleep(SHORT_DELAY_MS);
1056	>	assertTrue(lock.getQueuedThreads().contains(t1));
1057	>	t2.start();
1058	>	Thread.sleep(SHORT_DELAY_MS);
1059	>	assertTrue(lock.getQueuedThreads().contains(t1));
1060	>	assertTrue(lock.getQueuedThreads().contains(t2));
1061	>	t1.interrupt();
1062	>	Thread.sleep(SHORT_DELAY_MS);
1063	>	assertFalse(lock.getQueuedThreads().contains(t1));
1064	>	assertTrue(lock.getQueuedThreads().contains(t2));
1065	>	lock.writeLock().unlock();
1066	>	Thread.sleep(SHORT_DELAY_MS);
1067	>	assertTrue(lock.getQueuedThreads().isEmpty());
1068	>	t1.join();
1069	>	t2.join();
1070	>	}
1071	>
1072	>	/**
1073	>	* hasWaiters throws NPE if null
1074	>	*/
1075	>	public void testHasWaitersNPE() {
1076	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1077	>	try {
1078	>	lock.hasWaiters(null);
1079	>	shouldThrow();
1080	>	} catch (NullPointerException success) {}
1081	>	}
1082	>
1083	>	/**
1084	>	* getWaitQueueLength throws NPE if null
1085	>	*/
1086	>	public void testGetWaitQueueLengthNPE() {
1087	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1088	>	try {
1089	>	lock.getWaitQueueLength(null);
1090	>	shouldThrow();
1091	>	} catch (NullPointerException success) {}
1092	>	}
1093	>
1094	>
1095	>	/**
1096	>	* getWaitingThreads throws NPE if null
1097	>	*/
1098	>	public void testGetWaitingThreadsNPE() {
1099	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1100	>	try {
1101	>	lock.getWaitingThreads(null);
1102	>	shouldThrow();
1103	>	} catch (NullPointerException success) {}
1104	>	}
1105	>
1106	>	/**
1107	>	* hasWaiters throws IAE if not owned
1108	>	*/
1109	>	public void testHasWaitersIAE() {
1110	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1111	>	final Condition c = lock.writeLock().newCondition();
1112	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1113	>	try {
1114	>	lock2.hasWaiters(c);
1115	>	shouldThrow();
1116	>	} catch (IllegalArgumentException success) {}
1117	>	}
1118	>
1119	>	/**
1120	>	* hasWaiters throws IMSE if not locked
1121	>	*/
1122	>	public void testHasWaitersIMSE() {
1123	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1124	>	final Condition c = lock.writeLock().newCondition();
1125	>	try {
1126	>	lock.hasWaiters(c);
1127	>	shouldThrow();
1128	>	} catch (IllegalMonitorStateException success) {}
1129	>	}
1130	>
1131	>
1132	>	/**
1133	>	* getWaitQueueLength throws IAE if not owned
1134	>	*/
1135	>	public void testGetWaitQueueLengthIAE() {
1136	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1137	>	final Condition c = lock.writeLock().newCondition();
1138	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1139	>	try {
1140	>	lock2.getWaitQueueLength(c);
1141	>	shouldThrow();
1142	>	} catch (IllegalArgumentException success) {}
1143	>	}
1144	>
1145	>	/**
1146	>	* getWaitQueueLength throws IMSE if not locked
1147	>	*/
1148	>	public void testGetWaitQueueLengthIMSE() {
1149	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1150	>	final Condition c = lock.writeLock().newCondition();
1151	>	try {
1152	>	lock.getWaitQueueLength(c);
1153	>	shouldThrow();
1154	>	} catch (IllegalMonitorStateException success) {}
1155	>	}
1156	>
1157	>
1158	>	/**
1159	>	* getWaitingThreads throws IAE if not owned
1160	>	*/
1161	>	public void testGetWaitingThreadsIAE() {
1162	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1163	>	final Condition c = lock.writeLock().newCondition();
1164	>	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1165	>	try {
1166	>	lock2.getWaitingThreads(c);
1167	>	shouldThrow();
1168	>	} catch (IllegalArgumentException success) {}
1169	>	}
1170	>
1171	>	/**
1172	>	* getWaitingThreads throws IMSE if not locked
1173	>	*/
1174	>	public void testGetWaitingThreadsIMSE() {
1175	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1176	>	final Condition c = lock.writeLock().newCondition();
1177	>	try {
1178	>	lock.getWaitingThreads(c);
1179	>	shouldThrow();
1180	>	} catch (IllegalMonitorStateException success) {}
1181	>	}
1182	>
1183	>
1184	>	/**
1185	>	* hasWaiters returns true when a thread is waiting, else false
1186	>	*/
1187	>	public void testHasWaiters() throws InterruptedException {
1188	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1189	>	final Condition c = lock.writeLock().newCondition();
1190	>	Thread t = newStartedThread(new CheckedRunnable() {
1191	>	public void realRun() throws InterruptedException {
1192	>	lock.writeLock().lock();
1193	>	assertFalse(lock.hasWaiters(c));
1194	>	assertEquals(0, lock.getWaitQueueLength(c));
1195	>	c.await();
1196	>	lock.writeLock().unlock();
1197	>	}});
1198	>
1199	>	Thread.sleep(SHORT_DELAY_MS);
1200	>	lock.writeLock().lock();
1201	>	assertTrue(lock.hasWaiters(c));
1202	>	assertEquals(1, lock.getWaitQueueLength(c));
1203	>	c.signal();
1204	>	lock.writeLock().unlock();
1205	>	Thread.sleep(SHORT_DELAY_MS);
1206	>	lock.writeLock().lock();
1207	>	assertFalse(lock.hasWaiters(c));
1208	>	assertEquals(0, lock.getWaitQueueLength(c));
1209	>	lock.writeLock().unlock();
1210	>	t.join(SHORT_DELAY_MS);
1211	>	assertFalse(t.isAlive());
1212	>	}
1213	>
1214	>	/**
1215	>	* getWaitQueueLength returns number of waiting threads
1216	>	*/
1217	>	public void testGetWaitQueueLength() throws InterruptedException {
1218	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1219	>	final Condition c = lock.writeLock().newCondition();
1220	>	Thread t = newStartedThread(new CheckedRunnable() {
1221	>	public void realRun() throws InterruptedException {
1222	>	lock.writeLock().lock();
1223	>	assertFalse(lock.hasWaiters(c));
1224	>	assertEquals(0, lock.getWaitQueueLength(c));
1225	>	c.await();
1226	>	lock.writeLock().unlock();
1227	>	}});
1228	>
1229	>	Thread.sleep(SHORT_DELAY_MS);
1230	>	lock.writeLock().lock();
1231	>	assertTrue(lock.hasWaiters(c));
1232	>	assertEquals(1, lock.getWaitQueueLength(c));
1233	>	c.signal();
1234	>	lock.writeLock().unlock();
1235	>	Thread.sleep(SHORT_DELAY_MS);
1236	>	lock.writeLock().lock();
1237	>	assertFalse(lock.hasWaiters(c));
1238	>	assertEquals(0, lock.getWaitQueueLength(c));
1239	>	lock.writeLock().unlock();
1240	>	t.join(SHORT_DELAY_MS);
1241	>	assertFalse(t.isAlive());
1242	>	}
1243	>
1244	>
1245	>	/**
1246	>	* getWaitingThreads returns only and all waiting threads
1247	>	*/
1248	>	public void testGetWaitingThreads() throws InterruptedException {
1249	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1250	>	final Condition c = lock.writeLock().newCondition();
1251	>	Thread t1 = new Thread(new CheckedRunnable() {
1252	>	public void realRun() throws InterruptedException {
1253	>	lock.writeLock().lock();
1254	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1255	>	c.await();
1256	>	lock.writeLock().unlock();
1257	>	}});
1258	>
1259	>	Thread t2 = new Thread(new CheckedRunnable() {
1260	>	public void realRun() throws InterruptedException {
1261	>	lock.writeLock().lock();
1262	>	assertFalse(lock.getWaitingThreads(c).isEmpty());
1263	>	c.await();
1264	>	lock.writeLock().unlock();
1265	>	}});
1266	>
1267	>	lock.writeLock().lock();
1268	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1269	>	lock.writeLock().unlock();
1270	>	t1.start();
1271	>	Thread.sleep(SHORT_DELAY_MS);
1272	>	t2.start();
1273	>	Thread.sleep(SHORT_DELAY_MS);
1274	>	lock.writeLock().lock();
1275	>	assertTrue(lock.hasWaiters(c));
1276	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
1277	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
1278	>	c.signalAll();
1279	>	lock.writeLock().unlock();
1280	>	Thread.sleep(SHORT_DELAY_MS);
1281	>	lock.writeLock().lock();
1282	>	assertFalse(lock.hasWaiters(c));
1283	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1284	>	lock.writeLock().unlock();
1285	>	t1.join(SHORT_DELAY_MS);
1286	>	t2.join(SHORT_DELAY_MS);
1287	>	assertFalse(t1.isAlive());
1288	>	assertFalse(t2.isAlive());
1289	>	}
1290	>
1291	>	/**
1292	>	* toString indicates current lock state
1293	>	*/
1294	>	public void testToString() {
1295	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1296	>	String us = lock.toString();
1297	>	assertTrue(us.indexOf("Write locks = 0") >= 0);
1298	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1299	>	lock.writeLock().lock();
1300	>	String ws = lock.toString();
1301	>	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1302	>	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1303	>	lock.writeLock().unlock();
1304	>	lock.readLock().lock();
1305	>	lock.readLock().lock();
1306	>	String rs = lock.toString();
1307	>	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1308	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1309	>	}
1310	>
1311	>	/**
1312	>	* readLock.toString indicates current lock state
1313	>	*/
1314	>	public void testReadLockToString() {
1315	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1316	>	String us = lock.readLock().toString();
1317	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1318	>	lock.readLock().lock();
1319	>	lock.readLock().lock();
1320	>	String rs = lock.readLock().toString();
1321	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1322	>	}
1323	>
1324	>	/**
1325	>	* writeLock.toString indicates current lock state
1326	>	*/
1327	>	public void testWriteLockToString() {
1328	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1329	>	String us = lock.writeLock().toString();
1330	>	assertTrue(us.indexOf("Unlocked") >= 0);
1331	>	lock.writeLock().lock();
1332	>	String ls = lock.writeLock().toString();
1333	>	assertTrue(ls.indexOf("Locked") >= 0);
1334		}
112	–
1335
1336		}

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