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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 1.22 by dl, Tue May 3 16:02:00 2005 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/licenses/publicdomain
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 java.io.*;
13	+	import java.util.*;
14
15	<	public class ReentrantReadWriteLockTest extends TestCase {
13	<	static int HOLD_COUNT_TEST_LIMIT = 20;
14	<
15	>	public class ReentrantReadWriteLockTest extends JSR166TestCase {
16		public static void main(String[] args) {
17		junit.textui.TestRunner.run (suite());
18		}
18	–
19		public static Test suite() {
20		return new TestSuite(ReentrantReadWriteLockTest.class);
21		}
22
23	+	/**
24	+	* A runnable calling lockInterruptibly
25	+	*/
26	+	class InterruptibleLockRunnable implements Runnable {
27	+	final ReentrantReadWriteLock lock;
28	+	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
29	+	public void run() {
30	+	try {
31	+	lock.writeLock().lockInterruptibly();
32	+	} catch(InterruptedException success){}
33	+	}
34	+	}
35	+
36	+
37	+	/**
38	+	* A runnable calling lockInterruptibly that expects to be
39	+	* interrupted
40	+	*/
41	+	class InterruptedLockRunnable implements Runnable {
42	+	final ReentrantReadWriteLock lock;
43	+	InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
44	+	public void run() {
45	+	try {
46	+	lock.writeLock().lockInterruptibly();
47	+	threadShouldThrow();
48	+	} catch(InterruptedException success){}
49	+	}
50	+	}
51	+
52	+	/**
53	+	* Subclass to expose protected methods
54	+	*/
55	+	static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
56	+	PublicReentrantReadWriteLock() { super(); }
57	+	public Collection<Thread> getQueuedThreads() {
58	+	return super.getQueuedThreads();
59	+	}
60	+	public Collection<Thread> getWaitingThreads(Condition c) {
61	+	return super.getWaitingThreads(c);
62	+	}
63	+	}
64	+
65	+	/**
66	+	* Constructor sets given fairness, and is in unlocked state
67	+	*/
68	+	public void testConstructor() {
69	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
70	+	assertFalse(rl.isFair());
71	+	assertFalse(rl.isWriteLocked());
72	+	assertEquals(0, rl.getReadLockCount());
73	+	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
74	+	assertTrue(r2.isFair());
75	+	assertFalse(r2.isWriteLocked());
76	+	assertEquals(0, r2.getReadLockCount());
77	+	}
78	+
79	+	/**
80	+	* write-locking and read-locking an unlocked lock succeed
81	+	*/
82	+	public void testLock() {
83	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
84	+	rl.writeLock().lock();
85	+	assertTrue(rl.isWriteLocked());
86	+	assertTrue(rl.isWriteLockedByCurrentThread());
87	+	assertEquals(0, rl.getReadLockCount());
88	+	rl.writeLock().unlock();
89	+	assertFalse(rl.isWriteLocked());
90	+	assertFalse(rl.isWriteLockedByCurrentThread());
91	+	assertEquals(0, rl.getReadLockCount());
92	+	rl.readLock().lock();
93	+	assertFalse(rl.isWriteLocked());
94	+	assertFalse(rl.isWriteLockedByCurrentThread());
95	+	assertEquals(1, rl.getReadLockCount());
96	+	rl.readLock().unlock();
97	+	assertFalse(rl.isWriteLocked());
98	+	assertFalse(rl.isWriteLockedByCurrentThread());
99	+	assertEquals(0, rl.getReadLockCount());
100	+	}
101	+
102	+
103	+	/**
104	+	* locking an unlocked fair lock succeeds
105	+	*/
106	+	public void testFairLock() {
107	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
108	+	rl.writeLock().lock();
109	+	assertTrue(rl.isWriteLocked());
110	+	assertTrue(rl.isWriteLockedByCurrentThread());
111	+	assertEquals(0, rl.getReadLockCount());
112	+	rl.writeLock().unlock();
113	+	assertFalse(rl.isWriteLocked());
114	+	assertFalse(rl.isWriteLockedByCurrentThread());
115	+	assertEquals(0, rl.getReadLockCount());
116	+	rl.readLock().lock();
117	+	assertFalse(rl.isWriteLocked());
118	+	assertFalse(rl.isWriteLockedByCurrentThread());
119	+	assertEquals(1, rl.getReadLockCount());
120	+	rl.readLock().unlock();
121	+	assertFalse(rl.isWriteLocked());
122	+	assertFalse(rl.isWriteLockedByCurrentThread());
123	+	assertEquals(0, rl.getReadLockCount());
124	+	}
125
126	<	private static long SHORT_DELAY_MS = 100;
127	<	private static long MEDIUM_DELAY_MS = 1000;
26	<	private static long LONG_DELAY_MS = 10000;
27	<
28	<	/*
29	<	* Unlocks an unlocked lock, throws Illegal Monitor State
30	<	*
126	>	/**
127	>	* getWriteHoldCount returns number of recursive holds
128		*/
129	+	public void testGetHoldCount() {
130	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
131	+	for(int i = 1; i <= SIZE; i++) {
132	+	lock.writeLock().lock();
133	+	assertEquals(i,lock.getWriteHoldCount());
134	+	}
135	+	for(int i = SIZE; i > 0; i--) {
136	+	lock.writeLock().unlock();
137	+	assertEquals(i-1,lock.getWriteHoldCount());
138	+	}
139	+	}
140
141	<	public void testIllegalMonitorStateException(){
141	>
142	>	/**
143	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
144	>	*/
145	>	public void testUnlock_IllegalMonitorStateException() {
146		ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
147	<	try{
147	>	try {
148		rl.writeLock().unlock();
149	<	fail("Should of thown Illegal Monitor State Exception");
149	>	shouldThrow();
150	>	} catch(IllegalMonitorStateException success){}
151	>	}
152	>
153	>
154	>	/**
155	>	* write-lockInterruptibly is interruptible
156	>	*/
157	>	public void testWriteLockInterruptibly_Interrupted() {
158	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
159	>	Thread t = new Thread(new Runnable() {
160	>	public void run() {
161	>	try {
162	>	lock.writeLock().lockInterruptibly();
163	>	lock.writeLock().unlock();
164	>	lock.writeLock().lockInterruptibly();
165	>	lock.writeLock().unlock();
166	>	} catch(InterruptedException success){}
167	>	}
168	>	});
169	>	try {
170	>	lock.writeLock().lock();
171	>	t.start();
172	>	t.interrupt();
173	>	lock.writeLock().unlock();
174	>	t.join();
175	>	} catch(Exception e){
176	>	unexpectedException();
177	>	}
178	>	}
179
180	<	}catch(IllegalMonitorStateException sucess){}
180	>	/**
181	>	* timed write-tryLock is interruptible
182	>	*/
183	>	public void testWriteTryLock_Interrupted() {
184	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
185	>	lock.writeLock().lock();
186	>	Thread t = new Thread(new Runnable() {
187	>	public void run() {
188	>	try {
189	>	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
190	>	} catch(InterruptedException success){}
191	>	}
192	>	});
193	>	try {
194	>	t.start();
195	>	t.interrupt();
196	>	lock.writeLock().unlock();
197	>	t.join();
198	>	} catch(Exception e){
199	>	unexpectedException();
200	>	}
201	>	}
202
203	+	/**
204	+	* read-lockInterruptibly is interruptible
205	+	*/
206	+	public void testReadLockInterruptibly_Interrupted() {
207	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
208	+	lock.writeLock().lock();
209	+	Thread t = new Thread(new Runnable() {
210	+	public void run() {
211	+	try {
212	+	lock.readLock().lockInterruptibly();
213	+	} catch(InterruptedException success){}
214	+	}
215	+	});
216	+	try {
217	+	t.start();
218	+	t.interrupt();
219	+	lock.writeLock().unlock();
220	+	t.join();
221	+	} catch(Exception e){
222	+	unexpectedException();
223	+	}
224	+	}
225
226	+	/**
227	+	* timed read-tryLock is interruptible
228	+	*/
229	+	public void testReadTryLock_Interrupted() {
230	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
231	+	lock.writeLock().lock();
232	+	Thread t = new Thread(new Runnable() {
233	+	public void run() {
234	+	try {
235	+	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
236	+	threadShouldThrow();
237	+	} catch(InterruptedException success){}
238	+	}
239	+	});
240	+	try {
241	+	t.start();
242	+	t.interrupt();
243	+	t.join();
244	+	} catch(Exception e){
245	+	unexpectedException();
246	+	}
247		}
248	+
249
250	<	/*
251	<	* makes a lock, locks it, tries to aquire the lock in another thread
46	<	* interrupts that thread and waits for an interrupted Exception to
47	<	* be thrown.
250	>	/**
251	>	* write-tryLock fails if locked
252		*/
253	+	public void testWriteTryLockWhenLocked() {
254	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
255	+	lock.writeLock().lock();
256	+	Thread t = new Thread(new Runnable() {
257	+	public void run() {
258	+	threadAssertFalse(lock.writeLock().tryLock());
259	+	}
260	+	});
261	+	try {
262	+	t.start();
263	+	t.join();
264	+	lock.writeLock().unlock();
265	+	} catch(Exception e){
266	+	unexpectedException();
267	+	}
268	+	}
269
270	<	public void testInterruptedException(){
270	>	/**
271	>	* read-tryLock fails if locked
272	>	*/
273	>	public void testReadTryLockWhenLocked() {
274		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
275		lock.writeLock().lock();
276		Thread t = new Thread(new Runnable() {
277	<	public void run(){
278	<	try{
279	<	lock.writeLock().lockInterruptibly();
280	<	fail("should throw");
281	<	}catch(InterruptedException sucess){}
277	>	public void run() {
278	>	threadAssertFalse(lock.readLock().tryLock());
279	>	}
280	>	});
281	>	try {
282	>	t.start();
283	>	t.join();
284	>	lock.writeLock().unlock();
285	>	} catch(Exception e){
286	>	unexpectedException();
287	>	}
288	>	}
289	>
290	>	/**
291	>	* Multiple threads can hold a read lock when not write-locked
292	>	*/
293	>	public void testMultipleReadLocks() {
294	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
295	>	lock.readLock().lock();
296	>	Thread t = new Thread(new Runnable() {
297	>	public void run() {
298	>	threadAssertTrue(lock.readLock().tryLock());
299	>	lock.readLock().unlock();
300	>	}
301	>	});
302	>	try {
303	>	t.start();
304	>	t.join();
305	>	lock.readLock().unlock();
306	>	} catch(Exception e){
307	>	unexpectedException();
308	>	}
309	>	}
310	>
311	>	/**
312	>	* A writelock succeeds after reading threads unlock
313	>	*/
314	>	public void testWriteAfterMultipleReadLocks() {
315	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
316	>	lock.readLock().lock();
317	>	Thread t1 = new Thread(new Runnable() {
318	>	public void run() {
319	>	lock.readLock().lock();
320	>	lock.readLock().unlock();
321	>	}
322	>	});
323	>	Thread t2 = new Thread(new Runnable() {
324	>	public void run() {
325	>	lock.writeLock().lock();
326	>	lock.writeLock().unlock();
327	>	}
328	>	});
329	>
330	>	try {
331	>	t1.start();
332	>	t2.start();
333	>	Thread.sleep(SHORT_DELAY_MS);
334	>	lock.readLock().unlock();
335	>	t1.join(MEDIUM_DELAY_MS);
336	>	t2.join(MEDIUM_DELAY_MS);
337	>	assertTrue(!t1.isAlive());
338	>	assertTrue(!t2.isAlive());
339	>
340	>	} catch(Exception e){
341	>	unexpectedException();
342	>	}
343	>	}
344	>
345	>	/**
346	>	* Readlocks succeed after a writing thread unlocks
347	>	*/
348	>	public void testReadAfterWriteLock() {
349	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
350	>	lock.writeLock().lock();
351	>	Thread t1 = new Thread(new Runnable() {
352	>	public void run() {
353	>	lock.readLock().lock();
354	>	lock.readLock().unlock();
355		}
356		});
357	<	t.start();
358	<	t.interrupt();
359	<	lock.writeLock().unlock();
357	>	Thread t2 = new Thread(new Runnable() {
358	>	public void run() {
359	>	lock.readLock().lock();
360	>	lock.readLock().unlock();
361	>	}
362	>	});
363	>
364	>	try {
365	>	t1.start();
366	>	t2.start();
367	>	Thread.sleep(SHORT_DELAY_MS);
368	>	lock.writeLock().unlock();
369	>	t1.join(MEDIUM_DELAY_MS);
370	>	t2.join(MEDIUM_DELAY_MS);
371	>	assertTrue(!t1.isAlive());
372	>	assertTrue(!t2.isAlive());
373	>
374	>	} catch(Exception e){
375	>	unexpectedException();
376	>	}
377	>	}
378	>
379	>	/**
380	>	* Read trylock succeeds if write locked by current thread
381	>	*/
382	>	public void testReadHoldingWriteLock() {
383	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
384	>	lock.writeLock().lock();
385	>	assertTrue(lock.readLock().tryLock());
386	>	lock.readLock().unlock();
387	>	lock.writeLock().unlock();
388		}
389
390	<	/*
391	<	* tests for interrupted exception on a timed wait
392	<	*
390	>	/**
391	>	* Read lock succeeds if write locked by current thread even if
392	>	* other threads are waiting
393		*/
394	+	public void testReadHoldingWriteLock2() {
395	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
396	+	lock.writeLock().lock();
397	+	Thread t1 = new Thread(new Runnable() {
398	+	public void run() {
399	+	lock.readLock().lock();
400	+	lock.readLock().unlock();
401	+	}
402	+	});
403	+	Thread t2 = new Thread(new Runnable() {
404	+	public void run() {
405	+	lock.readLock().lock();
406	+	lock.readLock().unlock();
407	+	}
408	+	});
409	+
410	+	try {
411	+	t1.start();
412	+	t2.start();
413	+	lock.readLock().lock();
414	+	lock.readLock().unlock();
415	+	Thread.sleep(SHORT_DELAY_MS);
416	+	lock.readLock().lock();
417	+	lock.readLock().unlock();
418	+	lock.writeLock().unlock();
419	+	t1.join(MEDIUM_DELAY_MS);
420	+	t2.join(MEDIUM_DELAY_MS);
421	+	assertTrue(!t1.isAlive());
422	+	assertTrue(!t2.isAlive());
423	+
424	+	} catch(Exception e){
425	+	unexpectedException();
426	+	}
427	+	}
428	+
429	+	/**
430	+	* Fair Read trylock succeeds if write locked by current thread
431	+	*/
432	+	public void testReadHoldingWriteLockFair() {
433	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
434	+	lock.writeLock().lock();
435	+	assertTrue(lock.readLock().tryLock());
436	+	lock.readLock().unlock();
437	+	lock.writeLock().unlock();
438	+	}
439	+
440	+	/**
441	+	* Fair Read lock succeeds if write locked by current thread even if
442	+	* other threads are waiting
443	+	*/
444	+	public void testReadHoldingWriteLockFair2() {
445	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
446	+	lock.writeLock().lock();
447	+	Thread t1 = new Thread(new Runnable() {
448	+	public void run() {
449	+	lock.readLock().lock();
450	+	lock.readLock().unlock();
451	+	}
452	+	});
453	+	Thread t2 = new Thread(new Runnable() {
454	+	public void run() {
455	+	lock.readLock().lock();
456	+	lock.readLock().unlock();
457	+	}
458	+	});
459	+
460	+	try {
461	+	t1.start();
462	+	t2.start();
463	+	lock.readLock().lock();
464	+	lock.readLock().unlock();
465	+	Thread.sleep(SHORT_DELAY_MS);
466	+	lock.readLock().lock();
467	+	lock.readLock().unlock();
468	+	lock.writeLock().unlock();
469	+	t1.join(MEDIUM_DELAY_MS);
470	+	t2.join(MEDIUM_DELAY_MS);
471	+	assertTrue(!t1.isAlive());
472	+	assertTrue(!t2.isAlive());
473	+
474	+	} catch(Exception e){
475	+	unexpectedException();
476	+	}
477	+	}
478	+
479	+
480	+	/**
481	+	* Read tryLock succeeds if readlocked but not writelocked
482	+	*/
483	+	public void testTryLockWhenReadLocked() {
484	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
485	+	lock.readLock().lock();
486	+	Thread t = new Thread(new Runnable() {
487	+	public void run() {
488	+	threadAssertTrue(lock.readLock().tryLock());
489	+	lock.readLock().unlock();
490	+	}
491	+	});
492	+	try {
493	+	t.start();
494	+	t.join();
495	+	lock.readLock().unlock();
496	+	} catch(Exception e){
497	+	unexpectedException();
498	+	}
499	+	}
500	+
501	+
502	+
503	+	/**
504	+	* write tryLock fails when readlocked
505	+	*/
506	+	public void testWriteTryLockWhenReadLocked() {
507	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
508	+	lock.readLock().lock();
509	+	Thread t = new Thread(new Runnable() {
510	+	public void run() {
511	+	threadAssertFalse(lock.writeLock().tryLock());
512	+	}
513	+	});
514	+	try {
515	+	t.start();
516	+	t.join();
517	+	lock.readLock().unlock();
518	+	} catch(Exception e){
519	+	unexpectedException();
520	+	}
521	+	}
522	+
523
524
525	<	public void testInterruptedException2(){
525	>	/**
526	>	* write timed tryLock times out if locked
527	>	*/
528	>	public void testWriteTryLock_Timeout() {
529		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
530		lock.writeLock().lock();
531		Thread t = new Thread(new Runnable() {
532	<	public void run(){
533	<	try{
534	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
535	<	fail("should throw");
536	<	}catch(InterruptedException sucess){}
532	>	public void run() {
533	>	try {
534	>	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
535	>	} catch (Exception ex) {
536	>	threadUnexpectedException();
537	>	}
538		}
539		});
540	<	t.start();
541	<	t.interrupt();
540	>	try {
541	>	t.start();
542	>	t.join();
543	>	lock.writeLock().unlock();
544	>	} catch(Exception e){
545	>	unexpectedException();
546	>	}
547	>	}
548	>
549	>	/**
550	>	* read timed tryLock times out if write-locked
551	>	*/
552	>	public void testReadTryLock_Timeout() {
553	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
554	>	lock.writeLock().lock();
555	>	Thread t = new Thread(new Runnable() {
556	>	public void run() {
557	>	try {
558	>	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
559	>	} catch (Exception ex) {
560	>	threadUnexpectedException();
561	>	}
562	>	}
563	>	});
564	>	try {
565	>	t.start();
566	>	t.join();
567	>	lock.writeLock().unlock();
568	>	} catch(Exception e){
569	>	unexpectedException();
570	>	}
571	>	}
572	>
573	>
574	>	/**
575	>	* write lockInterruptibly succeeds if lock free else is interruptible
576	>	*/
577	>	public void testWriteLockInterruptibly() {
578	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
579	>	try {
580	>	lock.writeLock().lockInterruptibly();
581	>	} catch(Exception e) {
582	>	unexpectedException();
583	>	}
584	>	Thread t = new Thread(new Runnable() {
585	>	public void run() {
586	>	try {
587	>	lock.writeLock().lockInterruptibly();
588	>	threadShouldThrow();
589	>	}
590	>	catch(InterruptedException success) {
591	>	}
592	>	}
593	>	});
594	>	try {
595	>	t.start();
596	>	t.interrupt();
597	>	t.join();
598	>	lock.writeLock().unlock();
599	>	} catch(Exception e){
600	>	unexpectedException();
601	>	}
602		}
603
604	<
604	>	/**
605	>	*  read lockInterruptibly succeeds if lock free else is interruptible
606	>	*/
607	>	public void testReadLockInterruptibly() {
608	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
609	>	try {
610	>	lock.writeLock().lockInterruptibly();
611	>	} catch(Exception e) {
612	>	unexpectedException();
613	>	}
614	>	Thread t = new Thread(new Runnable() {
615	>	public void run() {
616	>	try {
617	>	lock.readLock().lockInterruptibly();
618	>	threadShouldThrow();
619	>	}
620	>	catch(InterruptedException success) {
621	>	}
622	>	}
623	>	});
624	>	try {
625	>	t.start();
626	>	t.interrupt();
627	>	t.join();
628	>	lock.writeLock().unlock();
629	>	} catch(Exception e){
630	>	unexpectedException();
631	>	}
632	>	}
633
634	<	/*
635	<	* current thread locks interruptibly the thread
91	<	* another thread tries to aquire the lock and blocks
92	<	* on the call. interrupt the attempted aquireLock
93	<	* assert that the first lock() call actually locked the lock
94	<	* assert that the current thread is the one holding the lock
634	>	/**
635	>	* Calling await without holding lock throws IllegalMonitorStateException
636		*/
637	+	public void testAwait_IllegalMonitor() {
638	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
639	+	final Condition c = lock.writeLock().newCondition();
640	+	try {
641	+	c.await();
642	+	shouldThrow();
643	+	}
644	+	catch (IllegalMonitorStateException success) {
645	+	}
646	+	catch (Exception ex) {
647	+	shouldThrow();
648	+	}
649	+	}
650
651	<	public void testLockedInterruptibly() {
651	>	/**
652	>	* Calling signal without holding lock throws IllegalMonitorStateException
653	>	*/
654	>	public void testSignal_IllegalMonitor() {
655		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
656	<	try {lock.writeLock().lockInterruptibly();} catch(Exception e) {}
656	>	final Condition c = lock.writeLock().newCondition();
657	>	try {
658	>	c.signal();
659	>	shouldThrow();
660	>	}
661	>	catch (IllegalMonitorStateException success) {
662	>	}
663	>	catch (Exception ex) {
664	>	unexpectedException();
665	>	}
666	>	}
667	>
668	>	/**
669	>	* awaitNanos without a signal times out
670	>	*/
671	>	public void testAwaitNanos_Timeout() {
672	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
673	>	final Condition c = lock.writeLock().newCondition();
674	>	try {
675	>	lock.writeLock().lock();
676	>	long t = c.awaitNanos(100);
677	>	assertTrue(t <= 0);
678	>	lock.writeLock().unlock();
679	>	}
680	>	catch (Exception ex) {
681	>	unexpectedException();
682	>	}
683	>	}
684	>
685	>
686	>	/**
687	>	*  timed await without a signal times out
688	>	*/
689	>	public void testAwait_Timeout() {
690	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
691	>	final Condition c = lock.writeLock().newCondition();
692	>	try {
693	>	lock.writeLock().lock();
694	>	lock.writeLock().unlock();
695	>	}
696	>	catch (Exception ex) {
697	>	unexpectedException();
698	>	}
699	>	}
700	>
701	>	/**
702	>	* awaitUntil without a signal times out
703	>	*/
704	>	public void testAwaitUntil_Timeout() {
705	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
706	>	final Condition c = lock.writeLock().newCondition();
707	>	try {
708	>	lock.writeLock().lock();
709	>	java.util.Date d = new java.util.Date();
710	>	lock.writeLock().unlock();
711	>	}
712	>	catch (Exception ex) {
713	>	unexpectedException();
714	>	}
715	>	}
716	>
717	>	/**
718	>	* await returns when signalled
719	>	*/
720	>	public void testAwait() {
721	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
722	>	final Condition c = lock.writeLock().newCondition();
723		Thread t = new Thread(new Runnable() {
724		public void run() {
725		try {
726	<	lock.writeLock().lockInterruptibly();
727	<	fail("Failed to generate an Interrupted Exception");
726	>	lock.writeLock().lock();
727	>	c.await();
728	>	lock.writeLock().unlock();
729		}
730	<	catch(InterruptedException e) {}
730	>	catch(InterruptedException e) {
731	>	threadUnexpectedException();
732	>	}
733		}
734		});
735	<	t.start();
736	<	t.interrupt();
735	>
736	>	try {
737	>	t.start();
738	>	Thread.sleep(SHORT_DELAY_MS);
739	>	lock.writeLock().lock();
740	>	c.signal();
741	>	lock.writeLock().unlock();
742	>	t.join(SHORT_DELAY_MS);
743	>	assertFalse(t.isAlive());
744	>	}
745	>	catch (Exception ex) {
746	>	unexpectedException();
747	>	}
748	>	}
749	>
750	>	/** A helper class for uninterruptible wait tests */
751	>	class UninterruptableThread extends Thread {
752	>	private Lock lock;
753	>	private Condition c;
754	>
755	>	public volatile boolean canAwake = false;
756	>	public volatile boolean interrupted = false;
757	>	public volatile boolean lockStarted = false;
758	>
759	>	public UninterruptableThread(Lock lock, Condition c) {
760	>	this.lock = lock;
761	>	this.c = c;
762	>	}
763	>
764	>	public synchronized void run() {
765	>	lock.lock();
766	>	lockStarted = true;
767	>
768	>	while (!canAwake) {
769	>	c.awaitUninterruptibly();
770	>	}
771	>
772	>	interrupted = isInterrupted();
773	>	lock.unlock();
774	>	}
775	>	}
776	>
777	>	/**
778	>	* awaitUninterruptibly doesn't abort on interrupt
779	>	*/
780	>	public void testAwaitUninterruptibly() {
781	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
782	>	final Condition c = lock.writeLock().newCondition();
783	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
784	>
785	>	try {
786	>	thread.start();
787	>
788	>	while (!thread.lockStarted) {
789	>	Thread.sleep(100);
790	>	}
791	>
792	>	lock.writeLock().lock();
793	>	try {
794	>	thread.interrupt();
795	>	thread.canAwake = true;
796	>	c.signal();
797	>	} finally {
798	>	lock.writeLock().unlock();
799	>	}
800	>
801	>	thread.join();
802	>	assertTrue(thread.interrupted);
803	>	assertFalse(thread.isAlive());
804	>	} catch (Exception ex) {
805	>	unexpectedException();
806	>	}
807	>	}
808	>
809	>	/**
810	>	* await is interruptible
811	>	*/
812	>	public void testAwait_Interrupt() {
813	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
814	>	final Condition c = lock.writeLock().newCondition();
815	>	Thread t = new Thread(new Runnable() {
816	>	public void run() {
817	>	try {
818	>	lock.writeLock().lock();
819	>	c.await();
820	>	lock.writeLock().unlock();
821	>	threadShouldThrow();
822	>	}
823	>	catch(InterruptedException success) {
824	>	}
825	>	}
826	>	});
827	>
828	>	try {
829	>	t.start();
830	>	Thread.sleep(SHORT_DELAY_MS);
831	>	t.interrupt();
832	>	t.join(SHORT_DELAY_MS);
833	>	assertFalse(t.isAlive());
834	>	}
835	>	catch (Exception ex) {
836	>	unexpectedException();
837	>	}
838	>	}
839	>
840	>	/**
841	>	* awaitNanos is interruptible
842	>	*/
843	>	public void testAwaitNanos_Interrupt() {
844	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
845	>	final Condition c = lock.writeLock().newCondition();
846	>	Thread t = new Thread(new Runnable() {
847	>	public void run() {
848	>	try {
849	>	lock.writeLock().lock();
850	>	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
851	>	lock.writeLock().unlock();
852	>	threadShouldThrow();
853	>	}
854	>	catch(InterruptedException success) {
855	>	}
856	>	}
857	>	});
858	>
859	>	try {
860	>	t.start();
861	>	Thread.sleep(SHORT_DELAY_MS);
862	>	t.interrupt();
863	>	t.join(SHORT_DELAY_MS);
864	>	assertFalse(t.isAlive());
865	>	}
866	>	catch (Exception ex) {
867	>	unexpectedException();
868	>	}
869	>	}
870	>
871	>	/**
872	>	* awaitUntil is interruptible
873	>	*/
874	>	public void testAwaitUntil_Interrupt() {
875	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
876	>	final Condition c = lock.writeLock().newCondition();
877	>	Thread t = new Thread(new Runnable() {
878	>	public void run() {
879	>	try {
880	>	lock.writeLock().lock();
881	>	java.util.Date d = new java.util.Date();
882	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
883	>	lock.writeLock().unlock();
884	>	threadShouldThrow();
885	>	}
886	>	catch(InterruptedException success) {
887	>	}
888	>	}
889	>	});
890	>
891	>	try {
892	>	t.start();
893	>	Thread.sleep(SHORT_DELAY_MS);
894	>	t.interrupt();
895	>	t.join(SHORT_DELAY_MS);
896	>	assertFalse(t.isAlive());
897	>	}
898	>	catch (Exception ex) {
899	>	unexpectedException();
900	>	}
901	>	}
902	>
903	>	/**
904	>	* signalAll wakes up all threads
905	>	*/
906	>	public void testSignalAll() {
907	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
908	>	final Condition c = lock.writeLock().newCondition();
909	>	Thread t1 = new Thread(new Runnable() {
910	>	public void run() {
911	>	try {
912	>	lock.writeLock().lock();
913	>	c.await();
914	>	lock.writeLock().unlock();
915	>	}
916	>	catch(InterruptedException e) {
917	>	threadUnexpectedException();
918	>	}
919	>	}
920	>	});
921	>
922	>	Thread t2 = new Thread(new Runnable() {
923	>	public void run() {
924	>	try {
925	>	lock.writeLock().lock();
926	>	c.await();
927	>	lock.writeLock().unlock();
928	>	}
929	>	catch(InterruptedException e) {
930	>	threadUnexpectedException();
931	>	}
932	>	}
933	>	});
934	>
935	>	try {
936	>	t1.start();
937	>	t2.start();
938	>	Thread.sleep(SHORT_DELAY_MS);
939	>	lock.writeLock().lock();
940	>	c.signalAll();
941	>	lock.writeLock().unlock();
942	>	t1.join(SHORT_DELAY_MS);
943	>	t2.join(SHORT_DELAY_MS);
944	>	assertFalse(t1.isAlive());
945	>	assertFalse(t2.isAlive());
946	>	}
947	>	catch (Exception ex) {
948	>	unexpectedException();
949	>	}
950	>	}
951	>
952	>	/**
953	>	* A serialized lock deserializes as unlocked
954	>	*/
955	>	public void testSerialization() {
956	>	ReentrantReadWriteLock l = new ReentrantReadWriteLock();
957	>	l.readLock().lock();
958	>	l.readLock().unlock();
959	>
960	>	try {
961	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
962	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
963	>	out.writeObject(l);
964	>	out.close();
965	>
966	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
967	>	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
968	>	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
969	>	r.readLock().lock();
970	>	r.readLock().unlock();
971	>	} catch(Exception e){
972	>	e.printStackTrace();
973	>	unexpectedException();
974	>	}
975	>	}
976	>
977	>	/**
978	>	* hasQueuedThreads reports whether there are waiting threads
979	>	*/
980	>	public void testhasQueuedThreads() {
981	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
982	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
983	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
984	>	try {
985	>	assertFalse(lock.hasQueuedThreads());
986	>	lock.writeLock().lock();
987	>	t1.start();
988	>	Thread.sleep(SHORT_DELAY_MS);
989	>	assertTrue(lock.hasQueuedThreads());
990	>	t2.start();
991	>	Thread.sleep(SHORT_DELAY_MS);
992	>	assertTrue(lock.hasQueuedThreads());
993	>	t1.interrupt();
994	>	Thread.sleep(SHORT_DELAY_MS);
995	>	assertTrue(lock.hasQueuedThreads());
996	>	lock.writeLock().unlock();
997	>	Thread.sleep(SHORT_DELAY_MS);
998	>	assertFalse(lock.hasQueuedThreads());
999	>	t1.join();
1000	>	t2.join();
1001	>	} catch(Exception e){
1002	>	unexpectedException();
1003	>	}
1004	>	}
1005	>
1006	>	/**
1007	>	* hasQueuedThread(null) throws NPE
1008	>	*/
1009	>	public void testHasQueuedThreadNPE() {
1010	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1011	>	try {
1012	>	sync.hasQueuedThread(null);
1013	>	shouldThrow();
1014	>	} catch (NullPointerException success) {
1015	>	}
1016	>	}
1017	>
1018	>	/**
1019	>	* hasQueuedThread reports whether a thread is queued.
1020	>	*/
1021	>	public void testHasQueuedThread() {
1022	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1023	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1024	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1025	>	try {
1026	>	assertFalse(sync.hasQueuedThread(t1));
1027	>	assertFalse(sync.hasQueuedThread(t2));
1028	>	sync.writeLock().lock();
1029	>	t1.start();
1030	>	Thread.sleep(SHORT_DELAY_MS);
1031	>	assertTrue(sync.hasQueuedThread(t1));
1032	>	t2.start();
1033	>	Thread.sleep(SHORT_DELAY_MS);
1034	>	assertTrue(sync.hasQueuedThread(t1));
1035	>	assertTrue(sync.hasQueuedThread(t2));
1036	>	t1.interrupt();
1037	>	Thread.sleep(SHORT_DELAY_MS);
1038	>	assertFalse(sync.hasQueuedThread(t1));
1039	>	assertTrue(sync.hasQueuedThread(t2));
1040	>	sync.writeLock().unlock();
1041	>	Thread.sleep(SHORT_DELAY_MS);
1042	>	assertFalse(sync.hasQueuedThread(t1));
1043	>	Thread.sleep(SHORT_DELAY_MS);
1044	>	assertFalse(sync.hasQueuedThread(t2));
1045	>	t1.join();
1046	>	t2.join();
1047	>	} catch(Exception e){
1048	>	unexpectedException();
1049	>	}
1050	>	}
1051	>
1052	>
1053	>	/**
1054	>	* getQueueLength reports number of waiting threads
1055	>	*/
1056	>	public void testGetQueueLength() {
1057	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1058	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1059	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1060	>	try {
1061	>	assertEquals(0, lock.getQueueLength());
1062	>	lock.writeLock().lock();
1063	>	t1.start();
1064	>	Thread.sleep(SHORT_DELAY_MS);
1065	>	assertEquals(1, lock.getQueueLength());
1066	>	t2.start();
1067	>	Thread.sleep(SHORT_DELAY_MS);
1068	>	assertEquals(2, lock.getQueueLength());
1069	>	t1.interrupt();
1070	>	Thread.sleep(SHORT_DELAY_MS);
1071	>	assertEquals(1, lock.getQueueLength());
1072	>	lock.writeLock().unlock();
1073	>	Thread.sleep(SHORT_DELAY_MS);
1074	>	assertEquals(0, lock.getQueueLength());
1075	>	t1.join();
1076	>	t2.join();
1077	>	} catch(Exception e){
1078	>	unexpectedException();
1079	>	}
1080	>	}
1081	>
1082	>	/**
1083	>	* getQueuedThreads includes waiting threads
1084	>	*/
1085	>	public void testGetQueuedThreads() {
1086	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1087	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1088	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1089	>	try {
1090	>	assertTrue(lock.getQueuedThreads().isEmpty());
1091	>	lock.writeLock().lock();
1092	>	assertTrue(lock.getQueuedThreads().isEmpty());
1093	>	t1.start();
1094	>	Thread.sleep(SHORT_DELAY_MS);
1095	>	assertTrue(lock.getQueuedThreads().contains(t1));
1096	>	t2.start();
1097	>	Thread.sleep(SHORT_DELAY_MS);
1098	>	assertTrue(lock.getQueuedThreads().contains(t1));
1099	>	assertTrue(lock.getQueuedThreads().contains(t2));
1100	>	t1.interrupt();
1101	>	Thread.sleep(SHORT_DELAY_MS);
1102	>	assertFalse(lock.getQueuedThreads().contains(t1));
1103	>	assertTrue(lock.getQueuedThreads().contains(t2));
1104	>	lock.writeLock().unlock();
1105	>	Thread.sleep(SHORT_DELAY_MS);
1106	>	assertTrue(lock.getQueuedThreads().isEmpty());
1107	>	t1.join();
1108	>	t2.join();
1109	>	} catch(Exception e){
1110	>	unexpectedException();
1111	>	}
1112	>	}
1113	>
1114	>	/**
1115	>	* hasWaiters throws NPE if null
1116	>	*/
1117	>	public void testHasWaitersNPE() {
1118	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1119	>	try {
1120	>	lock.hasWaiters(null);
1121	>	shouldThrow();
1122	>	} catch (NullPointerException success) {
1123	>	} catch (Exception ex) {
1124	>	unexpectedException();
1125	>	}
1126	>	}
1127	>
1128	>	/**
1129	>	* getWaitQueueLength throws NPE if null
1130	>	*/
1131	>	public void testGetWaitQueueLengthNPE() {
1132	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1133	>	try {
1134	>	lock.getWaitQueueLength(null);
1135	>	shouldThrow();
1136	>	} catch (NullPointerException success) {
1137	>	} catch (Exception ex) {
1138	>	unexpectedException();
1139	>	}
1140	>	}
1141	>
1142	>
1143	>	/**
1144	>	* getWaitingThreads throws NPE if null
1145	>	*/
1146	>	public void testGetWaitingThreadsNPE() {
1147	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1148	>	try {
1149	>	lock.getWaitingThreads(null);
1150	>	shouldThrow();
1151	>	} catch (NullPointerException success) {
1152	>	} catch (Exception ex) {
1153	>	unexpectedException();
1154	>	}
1155	>	}
1156	>
1157	>	/**
1158	>	* hasWaiters throws IAE if not owned
1159	>	*/
1160	>	public void testHasWaitersIAE() {
1161	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1162	>	final Condition c = (lock.writeLock().newCondition());
1163	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1164	>	try {
1165	>	lock2.hasWaiters(c);
1166	>	shouldThrow();
1167	>	} catch (IllegalArgumentException success) {
1168	>	} catch (Exception ex) {
1169	>	unexpectedException();
1170	>	}
1171	>	}
1172	>
1173	>	/**
1174	>	* hasWaiters throws IMSE if not locked
1175	>	*/
1176	>	public void testHasWaitersIMSE() {
1177	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1178	>	final Condition c = (lock.writeLock().newCondition());
1179	>	try {
1180	>	lock.hasWaiters(c);
1181	>	shouldThrow();
1182	>	} catch (IllegalMonitorStateException success) {
1183	>	} catch (Exception ex) {
1184	>	unexpectedException();
1185	>	}
1186	>	}
1187	>
1188	>
1189	>	/**
1190	>	* getWaitQueueLength throws IAE if not owned
1191	>	*/
1192	>	public void testGetWaitQueueLengthIAE() {
1193	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1194	>	final Condition c = (lock.writeLock().newCondition());
1195	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1196	>	try {
1197	>	lock2.getWaitQueueLength(c);
1198	>	shouldThrow();
1199	>	} catch (IllegalArgumentException success) {
1200	>	} catch (Exception ex) {
1201	>	unexpectedException();
1202	>	}
1203	>	}
1204	>
1205	>	/**
1206	>	* getWaitQueueLength throws IMSE if not locked
1207	>	*/
1208	>	public void testGetWaitQueueLengthIMSE() {
1209	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1210	>	final Condition c = (lock.writeLock().newCondition());
1211	>	try {
1212	>	lock.getWaitQueueLength(c);
1213	>	shouldThrow();
1214	>	} catch (IllegalMonitorStateException success) {
1215	>	} catch (Exception ex) {
1216	>	unexpectedException();
1217	>	}
1218	>	}
1219	>
1220	>
1221	>	/**
1222	>	* getWaitingThreads throws IAE if not owned
1223	>	*/
1224	>	public void testGetWaitingThreadsIAE() {
1225	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1226	>	final Condition c = (lock.writeLock().newCondition());
1227	>	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1228	>	try {
1229	>	lock2.getWaitingThreads(c);
1230	>	shouldThrow();
1231	>	} catch (IllegalArgumentException success) {
1232	>	} catch (Exception ex) {
1233	>	unexpectedException();
1234	>	}
1235	>	}
1236	>
1237	>	/**
1238	>	* getWaitingThreads throws IMSE if not locked
1239	>	*/
1240	>	public void testGetWaitingThreadsIMSE() {
1241	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1242	>	final Condition c = (lock.writeLock().newCondition());
1243	>	try {
1244	>	lock.getWaitingThreads(c);
1245	>	shouldThrow();
1246	>	} catch (IllegalMonitorStateException success) {
1247	>	} catch (Exception ex) {
1248	>	unexpectedException();
1249	>	}
1250	>	}
1251	>
1252	>
1253	>	/**
1254	>	* hasWaiters returns true when a thread is waiting, else false
1255	>	*/
1256	>	public void testHasWaiters() {
1257	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1258	>	final Condition c = (lock.writeLock().newCondition());
1259	>	Thread t = new Thread(new Runnable() {
1260	>	public void run() {
1261	>	try {
1262	>	lock.writeLock().lock();
1263	>	threadAssertFalse(lock.hasWaiters(c));
1264	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1265	>	c.await();
1266	>	lock.writeLock().unlock();
1267	>	}
1268	>	catch(InterruptedException e) {
1269	>	threadUnexpectedException();
1270	>	}
1271	>	}
1272	>	});
1273	>
1274	>	try {
1275	>	t.start();
1276	>	Thread.sleep(SHORT_DELAY_MS);
1277	>	lock.writeLock().lock();
1278	>	assertTrue(lock.hasWaiters(c));
1279	>	assertEquals(1, lock.getWaitQueueLength(c));
1280	>	c.signal();
1281	>	lock.writeLock().unlock();
1282	>	Thread.sleep(SHORT_DELAY_MS);
1283	>	lock.writeLock().lock();
1284	>	assertFalse(lock.hasWaiters(c));
1285	>	assertEquals(0, lock.getWaitQueueLength(c));
1286	>	lock.writeLock().unlock();
1287	>	t.join(SHORT_DELAY_MS);
1288	>	assertFalse(t.isAlive());
1289	>	}
1290	>	catch (Exception ex) {
1291	>	unexpectedException();
1292	>	}
1293	>	}
1294	>
1295	>	/**
1296	>	* getWaitQueueLength returns number of waiting threads
1297	>	*/
1298	>	public void testGetWaitQueueLength() {
1299	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1300	>	final Condition c = (lock.writeLock().newCondition());
1301	>	Thread t = new Thread(new Runnable() {
1302	>	public void run() {
1303	>	try {
1304	>	lock.writeLock().lock();
1305	>	threadAssertFalse(lock.hasWaiters(c));
1306	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1307	>	c.await();
1308	>	lock.writeLock().unlock();
1309	>	}
1310	>	catch(InterruptedException e) {
1311	>	threadUnexpectedException();
1312	>	}
1313	>	}
1314	>	});
1315	>
1316	>	try {
1317	>	t.start();
1318	>	Thread.sleep(SHORT_DELAY_MS);
1319	>	lock.writeLock().lock();
1320	>	assertTrue(lock.hasWaiters(c));
1321	>	assertEquals(1, lock.getWaitQueueLength(c));
1322	>	c.signal();
1323	>	lock.writeLock().unlock();
1324	>	Thread.sleep(SHORT_DELAY_MS);
1325	>	lock.writeLock().lock();
1326	>	assertFalse(lock.hasWaiters(c));
1327	>	assertEquals(0, lock.getWaitQueueLength(c));
1328	>	lock.writeLock().unlock();
1329	>	t.join(SHORT_DELAY_MS);
1330	>	assertFalse(t.isAlive());
1331	>	}
1332	>	catch (Exception ex) {
1333	>	unexpectedException();
1334	>	}
1335	>	}
1336	>
1337	>
1338	>	/**
1339	>	* getWaitingThreads returns only and all waiting threads
1340	>	*/
1341	>	public void testGetWaitingThreads() {
1342	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1343	>	final Condition c = lock.writeLock().newCondition();
1344	>	Thread t1 = new Thread(new Runnable() {
1345	>	public void run() {
1346	>	try {
1347	>	lock.writeLock().lock();
1348	>	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1349	>	c.await();
1350	>	lock.writeLock().unlock();
1351	>	}
1352	>	catch(InterruptedException e) {
1353	>	threadUnexpectedException();
1354	>	}
1355	>	}
1356	>	});
1357	>
1358	>	Thread t2 = new Thread(new Runnable() {
1359	>	public void run() {
1360	>	try {
1361	>	lock.writeLock().lock();
1362	>	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1363	>	c.await();
1364	>	lock.writeLock().unlock();
1365	>	}
1366	>	catch(InterruptedException e) {
1367	>	threadUnexpectedException();
1368	>	}
1369	>	}
1370	>	});
1371	>
1372	>	try {
1373	>	lock.writeLock().lock();
1374	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1375	>	lock.writeLock().unlock();
1376	>	t1.start();
1377	>	Thread.sleep(SHORT_DELAY_MS);
1378	>	t2.start();
1379	>	Thread.sleep(SHORT_DELAY_MS);
1380	>	lock.writeLock().lock();
1381	>	assertTrue(lock.hasWaiters(c));
1382	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
1383	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
1384	>	c.signalAll();
1385	>	lock.writeLock().unlock();
1386	>	Thread.sleep(SHORT_DELAY_MS);
1387	>	lock.writeLock().lock();
1388	>	assertFalse(lock.hasWaiters(c));
1389	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1390	>	lock.writeLock().unlock();
1391	>	t1.join(SHORT_DELAY_MS);
1392	>	t2.join(SHORT_DELAY_MS);
1393	>	assertFalse(t1.isAlive());
1394	>	assertFalse(t2.isAlive());
1395	>	}
1396	>	catch (Exception ex) {
1397	>	unexpectedException();
1398	>	}
1399	>	}
1400	>
1401	>	/**
1402	>	* toString indicates current lock state
1403	>	*/
1404	>	public void testToString() {
1405	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1406	>	String us = lock.toString();
1407	>	assertTrue(us.indexOf("Write locks = 0") >= 0);
1408	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1409	>	lock.writeLock().lock();
1410	>	String ws = lock.toString();
1411	>	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1412	>	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1413	>	lock.writeLock().unlock();
1414	>	lock.readLock().lock();
1415	>	lock.readLock().lock();
1416	>	String rs = lock.toString();
1417	>	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1418	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1419	>	}
1420	>
1421	>	/**
1422	>	* readLock.toString indicates current lock state
1423	>	*/
1424	>	public void testReadLockToString() {
1425	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1426	>	String us = lock.readLock().toString();
1427	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1428	>	lock.readLock().lock();
1429	>	lock.readLock().lock();
1430	>	String rs = lock.readLock().toString();
1431	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1432	>	}
1433	>
1434	>	/**
1435	>	* writeLock.toString indicates current lock state
1436	>	*/
1437	>	public void testWriteLockToString() {
1438	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1439	>	String us = lock.writeLock().toString();
1440	>	assertTrue(us.indexOf("Unlocked") >= 0);
1441	>	lock.writeLock().lock();
1442	>	String ls = lock.writeLock().toString();
1443	>	assertTrue(ls.indexOf("Locked") >= 0);
1444		}
112	–
1445
1446		}

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