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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.2 by dl, Sun Sep 7 20:39:11 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 {
14	<	static int HOLD_COUNT_TEST_LIMIT = 20;
15	<
15	>	public class ReentrantReadWriteLockTest extends JSR166TestCase {
16		public static void main(String[] args) {
17		junit.textui.TestRunner.run (suite());
18		}
19	–
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	<	private static long SHORT_DELAY_MS = 100;
38	<	private static long MEDIUM_DELAY_MS = 1000;
39	<	private static long LONG_DELAY_MS = 10000;
28	<
29	<	/*
30	<	* Unlocks an unlocked lock, throws Illegal Monitor State
31	<	*
37	>	/**
38	>	* A runnable calling lockInterruptibly that expects to be
39	>	* interrupted
40		*/
41	<
42	<	public void testIllegalMonitorStateException(){
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	<	try{
71	<	rl.writeLock().unlock();
72	<	fail("Should of thown Illegal Monitor State Exception");
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	<	}catch(IllegalMonitorStateException success){}
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	<	public void testInterruptedException(){
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	>
142	>	/**
143	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
144	>	*/
145	>	public void testUnlock_IllegalMonitorStateException() {
146	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
147	>	try {
148	>	rl.writeLock().unlock();
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();
47	–	lock.writeLock().lock();
159		Thread t = new Thread(new Runnable() {
160	<	public void run(){
161	<	try{
160	>	public void run() {
161	>	try {
162	>	lock.writeLock().lockInterruptibly();
163	>	lock.writeLock().unlock();
164		lock.writeLock().lockInterruptibly();
165	<	fail("should throw");
166	<	}catch(InterruptedException success){}
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	<	fail("unexpected exception");
176	>	unexpectedException();
177		}
178		}
179
180	<	public void testInterruptedException2(){
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{
187	>	public void run() {
188	>	try {
189		lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
190	<	fail("should throw");
74	<	}catch(InterruptedException success){}
190	>	} catch(InterruptedException success){}
191		}
192		});
193		try {
#	Line 80 | Line 196 | public class ReentrantReadWriteLockTest
196		lock.writeLock().unlock();
197		t.join();
198		} catch(Exception e){
199	<	fail("unexpected exception");
199	>	unexpectedException();
200		}
201		}
202
203	<	public void testInterruptedException3(){
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{
210	>	public void run() {
211	>	try {
212		lock.readLock().lockInterruptibly();
213	<	fail("should throw");
95	<	}catch(InterruptedException success){}
213	>	} catch(InterruptedException success){}
214		}
215		});
216		try {
#	Line 101 | Line 219 | public class ReentrantReadWriteLockTest
219		lock.writeLock().unlock();
220		t.join();
221		} catch(Exception e){
222	<	fail("unexpected exception");
222	>	unexpectedException();
223		}
224		}
225
226	<	public void testInterruptedException4(){
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{
233	>	public void run() {
234	>	try {
235		lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
236	<	fail("should throw");
237	<	}catch(InterruptedException success){}
236	>	threadShouldThrow();
237	>	} catch(InterruptedException success){}
238		}
239		});
240		try {
#	Line 121 | Line 242 | public class ReentrantReadWriteLockTest
242		t.interrupt();
243		t.join();
244		} catch(Exception e){
245	<	fail("unexpected exception");
245	>	unexpectedException();
246		}
247		}
248
249
250	<	public void testTryLockWhenLocked() {
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	<	assertFalse(lock.writeLock().tryLock());
257	>	public void run() {
258	>	threadAssertFalse(lock.writeLock().tryLock());
259		}
260		});
261		try {
#	Line 139 | Line 263 | public class ReentrantReadWriteLockTest
263		t.join();
264		lock.writeLock().unlock();
265		} catch(Exception e){
266	<	fail("unexpected exception");
266	>	unexpectedException();
267		}
268		}
269
270	<	public void testTryLockWhenLocked2() {
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	<	assertFalse(lock.readLock().tryLock());
277	>	public void run() {
278	>	threadAssertFalse(lock.readLock().tryLock());
279		}
280		});
281		try {
#	Line 156 | Line 283 | public class ReentrantReadWriteLockTest
283		t.join();
284		lock.writeLock().unlock();
285		} catch(Exception e){
286	<	fail("unexpected exception");
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	<	assertTrue(lock.readLock().tryLock());
297	>	public void run() {
298	>	threadAssertTrue(lock.readLock().tryLock());
299		lock.readLock().unlock();
300		}
301		});
#	Line 174 | Line 304 | public class ReentrantReadWriteLockTest
304		t.join();
305		lock.readLock().unlock();
306		} catch(Exception e){
307	<	fail("unexpected exception");
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(){
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(){
324	>	public void run() {
325		lock.writeLock().lock();
326		lock.writeLock().unlock();
327		}
#	Line 205 | Line 338 | public class ReentrantReadWriteLockTest
338		assertTrue(!t2.isAlive());
339
340		} catch(Exception e){
341	<	fail("unexpected exception");
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(){
352	>	public void run() {
353	>	lock.readLock().lock();
354	>	lock.readLock().unlock();
355	>	}
356	>	});
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	>	* 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(){
454	>	public void run() {
455		lock.readLock().lock();
456		lock.readLock().unlock();
457		}
#	Line 228 | Line 460 | public class ReentrantReadWriteLockTest
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);
#	Line 236 | Line 472 | public class ReentrantReadWriteLockTest
472		assertTrue(!t2.isAlive());
473
474		} catch(Exception e){
475	<	fail("unexpected exception");
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	<	assertTrue(lock.readLock().tryLock());
487	>	public void run() {
488	>	threadAssertTrue(lock.readLock().tryLock());
489		lock.readLock().unlock();
490		}
491		});
#	Line 255 | Line 494 | public class ReentrantReadWriteLockTest
494		t.join();
495		lock.readLock().unlock();
496		} catch(Exception e){
497	<	fail("unexpected exception");
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	<	assertFalse(lock.writeLock().tryLock());
510	>	public void run() {
511	>	threadAssertFalse(lock.writeLock().tryLock());
512		}
513		});
514		try {
#	Line 274 | Line 516 | public class ReentrantReadWriteLockTest
516		t.join();
517		lock.readLock().unlock();
518		} catch(Exception e){
519	<	fail("unexpected exception");
519	>	unexpectedException();
520		}
521		}
522
523
524
525	<	public void testTryLock_Timeout(){
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(){
532	>	public void run() {
533		try {
534	<	assertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
534	>	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
535		} catch (Exception ex) {
536	<	fail("unexpected exception");
536	>	threadUnexpectedException();
537		}
538		}
539		});
#	Line 297 | Line 542 | public class ReentrantReadWriteLockTest
542		t.join();
543		lock.writeLock().unlock();
544		} catch(Exception e){
545	<	fail("unexpected exception");
545	>	unexpectedException();
546		}
547		}
548
549	<	public void testTryLock_Timeout2(){
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(){
556	>	public void run() {
557		try {
558	<	assertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
558	>	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
559		} catch (Exception ex) {
560	<	fail("unexpected exception");
560	>	threadUnexpectedException();
561		}
562		}
563		});
#	Line 318 | Line 566 | public class ReentrantReadWriteLockTest
566		t.join();
567		lock.writeLock().unlock();
568		} catch(Exception e){
569	<	fail("unexpected exception");
569	>	unexpectedException();
570		}
571		}
572
573
574	<	public void testLockInterruptibly() {
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	<	fail("unexpected exception");
582	>	unexpectedException();
583		}
584		Thread t = new Thread(new Runnable() {
585		public void run() {
586		try {
587		lock.writeLock().lockInterruptibly();
588	<	fail("should throw");
588	>	threadShouldThrow();
589		}
590		catch(InterruptedException success) {
591		}
#	Line 346 | Line 597 | public class ReentrantReadWriteLockTest
597		t.join();
598		lock.writeLock().unlock();
599		} catch(Exception e){
600	<	fail("unexpected exception");
600	>	unexpectedException();
601		}
602		}
603
604	<	public void testLockInterruptibly2() {
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	<	fail("unexpected exception");
612	>	unexpectedException();
613		}
614		Thread t = new Thread(new Runnable() {
615		public void run() {
616		try {
617		lock.readLock().lockInterruptibly();
618	<	fail("should throw");
618	>	threadShouldThrow();
619		}
620		catch(InterruptedException success) {
621		}
#	Line 373 | Line 627 | public class ReentrantReadWriteLockTest
627		t.join();
628		lock.writeLock().unlock();
629		} catch(Exception e){
630	<	fail("unexpected exception");
630	>	unexpectedException();
631		}
632		}
633
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	<	fail("should throw");
642	>	shouldThrow();
643		}
644		catch (IllegalMonitorStateException success) {
645		}
646		catch (Exception ex) {
647	<	fail("should throw IMSE");
647	>	shouldThrow();
648		}
649		}
650
651	+	/**
652	+	* Calling signal without holding lock throws IllegalMonitorStateException
653	+	*/
654		public void testSignal_IllegalMonitor() {
655		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
656		final Condition c = lock.writeLock().newCondition();
657		try {
658		c.signal();
659	<	fail("should throw");
659	>	shouldThrow();
660		}
661		catch (IllegalMonitorStateException success) {
662		}
663		catch (Exception ex) {
664	<	fail("should throw IMSE");
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();
#	Line 415 | Line 678 | public class ReentrantReadWriteLockTest
678		lock.writeLock().unlock();
679		}
680		catch (Exception ex) {
681	<	fail("unexpected exception");
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();
427	–	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
694		lock.writeLock().unlock();
695		}
696		catch (Exception ex) {
697	<	fail("unexpected exception");
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();
441	–	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
710		lock.writeLock().unlock();
711		}
712		catch (Exception ex) {
713	<	fail("unexpected exception");
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();
#	Line 457 | Line 728 | public class ReentrantReadWriteLockTest
728		lock.writeLock().unlock();
729		}
730		catch(InterruptedException e) {
731	<	fail("unexpected exception");
731	>	threadUnexpectedException();
732		}
733		}
734		});
#	Line 472 | Line 743 | public class ReentrantReadWriteLockTest
743		assertFalse(t.isAlive());
744		}
745		catch (Exception ex) {
746	<	fail("unexpected exception");
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();
781	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
782		final Condition c = lock.writeLock().newCondition();
783	<	Thread t = new Thread(new Runnable() {
483	<	public void run() {
484	<	lock.writeLock().lock();
485	<	c.awaitUninterruptibly();
486	<	lock.writeLock().unlock();
487	<	}
488	<	});
783	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
784
785		try {
786	<	t.start();
787	<	Thread.sleep(SHORT_DELAY_MS);
788	<	t.interrupt();
786	>	thread.start();
787	>
788	>	while (!thread.lockStarted) {
789	>	Thread.sleep(100);
790	>	}
791	>
792		lock.writeLock().lock();
793	<	c.signal();
794	<	lock.writeLock().unlock();
795	<	t.join(SHORT_DELAY_MS);
796	<	assertFalse(t.isAlive());
797	<	}
798	<	catch (Exception ex) {
799	<	fail("unexpected exception");
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();
#	Line 511 | Line 818 | public class ReentrantReadWriteLockTest
818		lock.writeLock().lock();
819		c.await();
820		lock.writeLock().unlock();
821	<	fail("should throw");
821	>	threadShouldThrow();
822		}
823		catch(InterruptedException success) {
824		}
#	Line 526 | Line 833 | public class ReentrantReadWriteLockTest
833		assertFalse(t.isAlive());
834		}
835		catch (Exception ex) {
836	<	fail("unexpected exception");
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();
#	Line 539 | Line 849 | public class ReentrantReadWriteLockTest
849		lock.writeLock().lock();
850		c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
851		lock.writeLock().unlock();
852	<	fail("should throw");
852	>	threadShouldThrow();
853		}
854		catch(InterruptedException success) {
855		}
#	Line 554 | Line 864 | public class ReentrantReadWriteLockTest
864		assertFalse(t.isAlive());
865		}
866		catch (Exception ex) {
867	<	fail("unexpected exception");
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();
#	Line 568 | Line 881 | public class ReentrantReadWriteLockTest
881		java.util.Date d = new java.util.Date();
882		c.awaitUntil(new java.util.Date(d.getTime() + 10000));
883		lock.writeLock().unlock();
884	<	fail("should throw");
884	>	threadShouldThrow();
885		}
886		catch(InterruptedException success) {
887		}
#	Line 583 | Line 896 | public class ReentrantReadWriteLockTest
896		assertFalse(t.isAlive());
897		}
898		catch (Exception ex) {
899	<	fail("unexpected exception");
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();
#	Line 598 | Line 914 | public class ReentrantReadWriteLockTest
914		lock.writeLock().unlock();
915		}
916		catch(InterruptedException e) {
917	<	fail("unexpected exception");
917	>	threadUnexpectedException();
918		}
919		}
920		});
#	Line 611 | Line 927 | public class ReentrantReadWriteLockTest
927		lock.writeLock().unlock();
928		}
929		catch(InterruptedException e) {
930	<	fail("unexpected exception");
930	>	threadUnexpectedException();
931		}
932		}
933		});
#	Line 629 | Line 945 | public class ReentrantReadWriteLockTest
945		assertFalse(t2.isAlive());
946		}
947		catch (Exception ex) {
948	<	fail("unexpected exception");
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();
#	Line 651 | Line 970 | public class ReentrantReadWriteLockTest
970		r.readLock().unlock();
971		} catch(Exception e){
972		e.printStackTrace();
973	<	fail("unexpected exception");
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	+	}
1445
1446		}

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