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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.3 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.20 by dl, Fri Jul 2 10:24:00 2004 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 JSR166TestCase {
16		public static void main(String[] args) {
#	Line 18 | Line 20 | public class ReentrantReadWriteLockTest
20		return new TestSuite(ReentrantReadWriteLockTest.class);
21		}
22
23	<	static int HOLD_COUNT_TEST_LIMIT = 20;
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	<	* Unlocks an unlocked lock, throws Illegal Monitor State
25	<	*
52	>	/**
53	>	* Subclass to expose protected methods
54		*/
55	<	public void testIllegalMonitorStateException(){
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	>	/**
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	<	}catch(IllegalMonitorStateException success){}
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	<	public void testInterruptedException(){
154	>	/**
155	>	* write-lockInterruptibly is interruptible
156	>	*/
157	>	public void testWriteLockInterruptibly_Interrupted() {
158		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
40	–	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	<	threadFail("should throw");
164	<	}catch(InterruptedException success){}
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	<	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	<	threadFail("should throw");
67	<	}catch(InterruptedException success){}
190	>	} catch(InterruptedException success){}
191		}
192		});
193		try {
#	Line 73 | 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	<	threadFail("should throw");
88	<	}catch(InterruptedException success){}
213	>	} catch(InterruptedException success){}
214		}
215		});
216		try {
#	Line 94 | 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	<	threadFail("should throw");
237	<	}catch(InterruptedException success){}
236	>	threadShouldThrow();
237	>	} catch(InterruptedException success){}
238		}
239		});
240		try {
#	Line 114 | 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(){
257	>	public void run() {
258		threadAssertFalse(lock.writeLock().tryLock());
259		}
260		});
#	Line 132 | 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(){
277	>	public void run() {
278		threadAssertFalse(lock.readLock().tryLock());
279		}
280		});
#	Line 149 | 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(){
297	>	public void run() {
298		threadAssertTrue(lock.readLock().tryLock());
299		lock.readLock().unlock();
300		}
#	Line 167 | 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 198 | 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 221 | 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 229 | 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(){
487	>	public void run() {
488		threadAssertTrue(lock.readLock().tryLock());
489		lock.readLock().unlock();
490		}
#	Line 248 | 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(){
510	>	public void run() {
511		threadAssertFalse(lock.writeLock().tryLock());
512		}
513		});
#	Line 267 | 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		threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
535		} catch (Exception ex) {
536	<	threadFail("unexpected exception");
536	>	threadUnexpectedException();
537		}
538		}
539		});
#	Line 290 | 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		threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
559		} catch (Exception ex) {
560	<	threadFail("unexpected exception");
560	>	threadUnexpectedException();
561		}
562		}
563		});
#	Line 311 | 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	<	threadFail("should throw");
588	>	threadShouldThrow();
589		}
590		catch(InterruptedException success) {
591		}
#	Line 339 | 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	<	threadFail("should throw");
618	>	threadShouldThrow();
619		}
620		catch(InterruptedException success) {
621		}
#	Line 366 | 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 408 | 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();
#	Line 421 | Line 695 | public class ReentrantReadWriteLockTest
695		lock.writeLock().unlock();
696		}
697		catch (Exception ex) {
698	<	fail("unexpected exception");
698	>	unexpectedException();
699		}
700		}
701
702	+	/**
703	+	* awaitUntil without a signal times out
704	+	*/
705		public void testAwaitUntil_Timeout() {
706		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
707		final Condition c = lock.writeLock().newCondition();
#	Line 435 | Line 712 | public class ReentrantReadWriteLockTest
712		lock.writeLock().unlock();
713		}
714		catch (Exception ex) {
715	<	fail("unexpected exception");
715	>	unexpectedException();
716		}
717		}
718
719	+	/**
720	+	* await returns when signalled
721	+	*/
722		public void testAwait() {
723		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
724		final Condition c = lock.writeLock().newCondition();
#	Line 450 | Line 730 | public class ReentrantReadWriteLockTest
730		lock.writeLock().unlock();
731		}
732		catch(InterruptedException e) {
733	<	threadFail("unexpected exception");
733	>	threadUnexpectedException();
734		}
735		}
736		});
#	Line 465 | Line 745 | public class ReentrantReadWriteLockTest
745		assertFalse(t.isAlive());
746		}
747		catch (Exception ex) {
748	<	fail("unexpected exception");
748	>	unexpectedException();
749		}
750		}
751
752	+	/**
753	+	* awaitUninterruptibly doesn't abort on interrupt
754	+	*/
755		public void testAwaitUninterruptibly() {
756		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
757		final Condition c = lock.writeLock().newCondition();
#	Line 487 | Line 770 | public class ReentrantReadWriteLockTest
770		lock.writeLock().lock();
771		c.signal();
772		lock.writeLock().unlock();
773	+	assert(t.isInterrupted());
774		t.join(SHORT_DELAY_MS);
775		assertFalse(t.isAlive());
776		}
777		catch (Exception ex) {
778	<	fail("unexpected exception");
778	>	unexpectedException();
779		}
780		}
781
782	+	/**
783	+	* await is interruptible
784	+	*/
785		public void testAwait_Interrupt() {
786		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
787		final Condition c = lock.writeLock().newCondition();
#	Line 504 | Line 791 | public class ReentrantReadWriteLockTest
791		lock.writeLock().lock();
792		c.await();
793		lock.writeLock().unlock();
794	<	threadFail("should throw");
794	>	threadShouldThrow();
795		}
796		catch(InterruptedException success) {
797		}
#	Line 519 | Line 806 | public class ReentrantReadWriteLockTest
806		assertFalse(t.isAlive());
807		}
808		catch (Exception ex) {
809	<	fail("unexpected exception");
809	>	unexpectedException();
810		}
811		}
812
813	+	/**
814	+	* awaitNanos is interruptible
815	+	*/
816		public void testAwaitNanos_Interrupt() {
817		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
818		final Condition c = lock.writeLock().newCondition();
#	Line 532 | Line 822 | public class ReentrantReadWriteLockTest
822		lock.writeLock().lock();
823		c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
824		lock.writeLock().unlock();
825	<	threadFail("should throw");
825	>	threadShouldThrow();
826		}
827		catch(InterruptedException success) {
828		}
#	Line 547 | Line 837 | public class ReentrantReadWriteLockTest
837		assertFalse(t.isAlive());
838		}
839		catch (Exception ex) {
840	<	fail("unexpected exception");
840	>	unexpectedException();
841		}
842		}
843
844	+	/**
845	+	* awaitUntil is interruptible
846	+	*/
847		public void testAwaitUntil_Interrupt() {
848		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
849		final Condition c = lock.writeLock().newCondition();
#	Line 561 | Line 854 | public class ReentrantReadWriteLockTest
854		java.util.Date d = new java.util.Date();
855		c.awaitUntil(new java.util.Date(d.getTime() + 10000));
856		lock.writeLock().unlock();
857	<	threadFail("should throw");
857	>	threadShouldThrow();
858		}
859		catch(InterruptedException success) {
860		}
#	Line 576 | Line 869 | public class ReentrantReadWriteLockTest
869		assertFalse(t.isAlive());
870		}
871		catch (Exception ex) {
872	<	fail("unexpected exception");
872	>	unexpectedException();
873		}
874		}
875
876	+	/**
877	+	* signalAll wakes up all threads
878	+	*/
879		public void testSignalAll() {
880		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
881		final Condition c = lock.writeLock().newCondition();
#	Line 591 | Line 887 | public class ReentrantReadWriteLockTest
887		lock.writeLock().unlock();
888		}
889		catch(InterruptedException e) {
890	<	threadFail("unexpected exception");
890	>	threadUnexpectedException();
891		}
892		}
893		});
#	Line 604 | Line 900 | public class ReentrantReadWriteLockTest
900		lock.writeLock().unlock();
901		}
902		catch(InterruptedException e) {
903	<	threadFail("unexpected exception");
903	>	threadUnexpectedException();
904		}
905		}
906		});
#	Line 622 | Line 918 | public class ReentrantReadWriteLockTest
918		assertFalse(t2.isAlive());
919		}
920		catch (Exception ex) {
921	<	fail("unexpected exception");
921	>	unexpectedException();
922		}
923		}
924
925	+	/**
926	+	* A serialized lock deserializes as unlocked
927	+	*/
928		public void testSerialization() {
929		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
930		l.readLock().lock();
#	Line 644 | Line 943 | public class ReentrantReadWriteLockTest
943		r.readLock().unlock();
944		} catch(Exception e){
945		e.printStackTrace();
946	<	fail("unexpected exception");
946	>	unexpectedException();
947		}
948		}
949
950	+	/**
951	+	* hasQueuedThreads reports whether there are waiting threads
952	+	*/
953	+	public void testhasQueuedThreads() {
954	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
955	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
956	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
957	+	try {
958	+	assertFalse(lock.hasQueuedThreads());
959	+	lock.writeLock().lock();
960	+	t1.start();
961	+	Thread.sleep(SHORT_DELAY_MS);
962	+	assertTrue(lock.hasQueuedThreads());
963	+	t2.start();
964	+	Thread.sleep(SHORT_DELAY_MS);
965	+	assertTrue(lock.hasQueuedThreads());
966	+	t1.interrupt();
967	+	Thread.sleep(SHORT_DELAY_MS);
968	+	assertTrue(lock.hasQueuedThreads());
969	+	lock.writeLock().unlock();
970	+	Thread.sleep(SHORT_DELAY_MS);
971	+	assertFalse(lock.hasQueuedThreads());
972	+	t1.join();
973	+	t2.join();
974	+	} catch(Exception e){
975	+	unexpectedException();
976	+	}
977	+	}
978	+
979	+	/**
980	+	* hasQueuedThread(null) throws NPE
981	+	*/
982	+	public void testHasQueuedThreadNPE() {
983	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
984	+	try {
985	+	sync.hasQueuedThread(null);
986	+	shouldThrow();
987	+	} catch (NullPointerException success) {
988	+	}
989	+	}
990	+
991	+	/**
992	+	* hasQueuedThread reports whether a thread is queued.
993	+	*/
994	+	public void testHasQueuedThread() {
995	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
996	+	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
997	+	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
998	+	try {
999	+	assertFalse(sync.hasQueuedThread(t1));
1000	+	assertFalse(sync.hasQueuedThread(t2));
1001	+	sync.writeLock().lock();
1002	+	t1.start();
1003	+	Thread.sleep(SHORT_DELAY_MS);
1004	+	assertTrue(sync.hasQueuedThread(t1));
1005	+	t2.start();
1006	+	Thread.sleep(SHORT_DELAY_MS);
1007	+	assertTrue(sync.hasQueuedThread(t1));
1008	+	assertTrue(sync.hasQueuedThread(t2));
1009	+	t1.interrupt();
1010	+	Thread.sleep(SHORT_DELAY_MS);
1011	+	assertFalse(sync.hasQueuedThread(t1));
1012	+	assertTrue(sync.hasQueuedThread(t2));
1013	+	sync.writeLock().unlock();
1014	+	Thread.sleep(SHORT_DELAY_MS);
1015	+	assertFalse(sync.hasQueuedThread(t1));
1016	+	Thread.sleep(SHORT_DELAY_MS);
1017	+	assertFalse(sync.hasQueuedThread(t2));
1018	+	t1.join();
1019	+	t2.join();
1020	+	} catch(Exception e){
1021	+	unexpectedException();
1022	+	}
1023	+	}
1024	+
1025	+
1026	+	/**
1027	+	* getQueueLength reports number of waiting threads
1028	+	*/
1029	+	public void testGetQueueLength() {
1030	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1031	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1032	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1033	+	try {
1034	+	assertEquals(0, lock.getQueueLength());
1035	+	lock.writeLock().lock();
1036	+	t1.start();
1037	+	Thread.sleep(SHORT_DELAY_MS);
1038	+	assertEquals(1, lock.getQueueLength());
1039	+	t2.start();
1040	+	Thread.sleep(SHORT_DELAY_MS);
1041	+	assertEquals(2, lock.getQueueLength());
1042	+	t1.interrupt();
1043	+	Thread.sleep(SHORT_DELAY_MS);
1044	+	assertEquals(1, lock.getQueueLength());
1045	+	lock.writeLock().unlock();
1046	+	Thread.sleep(SHORT_DELAY_MS);
1047	+	assertEquals(0, lock.getQueueLength());
1048	+	t1.join();
1049	+	t2.join();
1050	+	} catch(Exception e){
1051	+	unexpectedException();
1052	+	}
1053	+	}
1054	+
1055	+	/**
1056	+	* getQueuedThreads includes waiting threads
1057	+	*/
1058	+	public void testGetQueuedThreads() {
1059	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1060	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1061	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1062	+	try {
1063	+	assertTrue(lock.getQueuedThreads().isEmpty());
1064	+	lock.writeLock().lock();
1065	+	assertTrue(lock.getQueuedThreads().isEmpty());
1066	+	t1.start();
1067	+	Thread.sleep(SHORT_DELAY_MS);
1068	+	assertTrue(lock.getQueuedThreads().contains(t1));
1069	+	t2.start();
1070	+	Thread.sleep(SHORT_DELAY_MS);
1071	+	assertTrue(lock.getQueuedThreads().contains(t1));
1072	+	assertTrue(lock.getQueuedThreads().contains(t2));
1073	+	t1.interrupt();
1074	+	Thread.sleep(SHORT_DELAY_MS);
1075	+	assertFalse(lock.getQueuedThreads().contains(t1));
1076	+	assertTrue(lock.getQueuedThreads().contains(t2));
1077	+	lock.writeLock().unlock();
1078	+	Thread.sleep(SHORT_DELAY_MS);
1079	+	assertTrue(lock.getQueuedThreads().isEmpty());
1080	+	t1.join();
1081	+	t2.join();
1082	+	} catch(Exception e){
1083	+	unexpectedException();
1084	+	}
1085	+	}
1086	+
1087	+	/**
1088	+	* hasWaiters throws NPE if null
1089	+	*/
1090	+	public void testHasWaitersNPE() {
1091	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1092	+	try {
1093	+	lock.hasWaiters(null);
1094	+	shouldThrow();
1095	+	} catch (NullPointerException success) {
1096	+	} catch (Exception ex) {
1097	+	unexpectedException();
1098	+	}
1099	+	}
1100	+
1101	+	/**
1102	+	* getWaitQueueLength throws NPE if null
1103	+	*/
1104	+	public void testGetWaitQueueLengthNPE() {
1105	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1106	+	try {
1107	+	lock.getWaitQueueLength(null);
1108	+	shouldThrow();
1109	+	} catch (NullPointerException success) {
1110	+	} catch (Exception ex) {
1111	+	unexpectedException();
1112	+	}
1113	+	}
1114	+
1115	+
1116	+	/**
1117	+	* getWaitingThreads throws NPE if null
1118	+	*/
1119	+	public void testGetWaitingThreadsNPE() {
1120	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1121	+	try {
1122	+	lock.getWaitingThreads(null);
1123	+	shouldThrow();
1124	+	} catch (NullPointerException success) {
1125	+	} catch (Exception ex) {
1126	+	unexpectedException();
1127	+	}
1128	+	}
1129	+
1130	+	/**
1131	+	* hasWaiters throws IAE if not owned
1132	+	*/
1133	+	public void testHasWaitersIAE() {
1134	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1135	+	final Condition c = (lock.writeLock().newCondition());
1136	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1137	+	try {
1138	+	lock2.hasWaiters(c);
1139	+	shouldThrow();
1140	+	} catch (IllegalArgumentException success) {
1141	+	} catch (Exception ex) {
1142	+	unexpectedException();
1143	+	}
1144	+	}
1145	+
1146	+	/**
1147	+	* hasWaiters throws IMSE if not locked
1148	+	*/
1149	+	public void testHasWaitersIMSE() {
1150	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1151	+	final Condition c = (lock.writeLock().newCondition());
1152	+	try {
1153	+	lock.hasWaiters(c);
1154	+	shouldThrow();
1155	+	} catch (IllegalMonitorStateException success) {
1156	+	} catch (Exception ex) {
1157	+	unexpectedException();
1158	+	}
1159	+	}
1160	+
1161	+
1162	+	/**
1163	+	* getWaitQueueLength throws IAE if not owned
1164	+	*/
1165	+	public void testGetWaitQueueLengthIAE() {
1166	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1167	+	final Condition c = (lock.writeLock().newCondition());
1168	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1169	+	try {
1170	+	lock2.getWaitQueueLength(c);
1171	+	shouldThrow();
1172	+	} catch (IllegalArgumentException success) {
1173	+	} catch (Exception ex) {
1174	+	unexpectedException();
1175	+	}
1176	+	}
1177	+
1178	+	/**
1179	+	* getWaitQueueLength throws IMSE if not locked
1180	+	*/
1181	+	public void testGetWaitQueueLengthIMSE() {
1182	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1183	+	final Condition c = (lock.writeLock().newCondition());
1184	+	try {
1185	+	lock.getWaitQueueLength(c);
1186	+	shouldThrow();
1187	+	} catch (IllegalMonitorStateException success) {
1188	+	} catch (Exception ex) {
1189	+	unexpectedException();
1190	+	}
1191	+	}
1192	+
1193	+
1194	+	/**
1195	+	* getWaitingThreads throws IAE if not owned
1196	+	*/
1197	+	public void testGetWaitingThreadsIAE() {
1198	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1199	+	final Condition c = (lock.writeLock().newCondition());
1200	+	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1201	+	try {
1202	+	lock2.getWaitingThreads(c);
1203	+	shouldThrow();
1204	+	} catch (IllegalArgumentException success) {
1205	+	} catch (Exception ex) {
1206	+	unexpectedException();
1207	+	}
1208	+	}
1209	+
1210	+	/**
1211	+	* getWaitingThreads throws IMSE if not locked
1212	+	*/
1213	+	public void testGetWaitingThreadsIMSE() {
1214	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1215	+	final Condition c = (lock.writeLock().newCondition());
1216	+	try {
1217	+	lock.getWaitingThreads(c);
1218	+	shouldThrow();
1219	+	} catch (IllegalMonitorStateException success) {
1220	+	} catch (Exception ex) {
1221	+	unexpectedException();
1222	+	}
1223	+	}
1224	+
1225	+
1226	+	/**
1227	+	* hasWaiters returns true when a thread is waiting, else false
1228	+	*/
1229	+	public void testHasWaiters() {
1230	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1231	+	final Condition c = (lock.writeLock().newCondition());
1232	+	Thread t = new Thread(new Runnable() {
1233	+	public void run() {
1234	+	try {
1235	+	lock.writeLock().lock();
1236	+	threadAssertFalse(lock.hasWaiters(c));
1237	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1238	+	c.await();
1239	+	lock.writeLock().unlock();
1240	+	}
1241	+	catch(InterruptedException e) {
1242	+	threadUnexpectedException();
1243	+	}
1244	+	}
1245	+	});
1246	+
1247	+	try {
1248	+	t.start();
1249	+	Thread.sleep(SHORT_DELAY_MS);
1250	+	lock.writeLock().lock();
1251	+	assertTrue(lock.hasWaiters(c));
1252	+	assertEquals(1, lock.getWaitQueueLength(c));
1253	+	c.signal();
1254	+	lock.writeLock().unlock();
1255	+	Thread.sleep(SHORT_DELAY_MS);
1256	+	lock.writeLock().lock();
1257	+	assertFalse(lock.hasWaiters(c));
1258	+	assertEquals(0, lock.getWaitQueueLength(c));
1259	+	lock.writeLock().unlock();
1260	+	t.join(SHORT_DELAY_MS);
1261	+	assertFalse(t.isAlive());
1262	+	}
1263	+	catch (Exception ex) {
1264	+	unexpectedException();
1265	+	}
1266	+	}
1267	+
1268	+	/**
1269	+	* getWaitQueueLength returns number of waiting threads
1270	+	*/
1271	+	public void testGetWaitQueueLength() {
1272	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1273	+	final Condition c = (lock.writeLock().newCondition());
1274	+	Thread t = new Thread(new Runnable() {
1275	+	public void run() {
1276	+	try {
1277	+	lock.writeLock().lock();
1278	+	threadAssertFalse(lock.hasWaiters(c));
1279	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1280	+	c.await();
1281	+	lock.writeLock().unlock();
1282	+	}
1283	+	catch(InterruptedException e) {
1284	+	threadUnexpectedException();
1285	+	}
1286	+	}
1287	+	});
1288	+
1289	+	try {
1290	+	t.start();
1291	+	Thread.sleep(SHORT_DELAY_MS);
1292	+	lock.writeLock().lock();
1293	+	assertTrue(lock.hasWaiters(c));
1294	+	assertEquals(1, lock.getWaitQueueLength(c));
1295	+	c.signal();
1296	+	lock.writeLock().unlock();
1297	+	Thread.sleep(SHORT_DELAY_MS);
1298	+	lock.writeLock().lock();
1299	+	assertFalse(lock.hasWaiters(c));
1300	+	assertEquals(0, lock.getWaitQueueLength(c));
1301	+	lock.writeLock().unlock();
1302	+	t.join(SHORT_DELAY_MS);
1303	+	assertFalse(t.isAlive());
1304	+	}
1305	+	catch (Exception ex) {
1306	+	unexpectedException();
1307	+	}
1308	+	}
1309	+
1310	+
1311	+	/**
1312	+	* getWaitingThreads returns only and all waiting threads
1313	+	*/
1314	+	public void testGetWaitingThreads() {
1315	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1316	+	final Condition c = lock.writeLock().newCondition();
1317	+	Thread t1 = new Thread(new Runnable() {
1318	+	public void run() {
1319	+	try {
1320	+	lock.writeLock().lock();
1321	+	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1322	+	c.await();
1323	+	lock.writeLock().unlock();
1324	+	}
1325	+	catch(InterruptedException e) {
1326	+	threadUnexpectedException();
1327	+	}
1328	+	}
1329	+	});
1330	+
1331	+	Thread t2 = new Thread(new Runnable() {
1332	+	public void run() {
1333	+	try {
1334	+	lock.writeLock().lock();
1335	+	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1336	+	c.await();
1337	+	lock.writeLock().unlock();
1338	+	}
1339	+	catch(InterruptedException e) {
1340	+	threadUnexpectedException();
1341	+	}
1342	+	}
1343	+	});
1344	+
1345	+	try {
1346	+	lock.writeLock().lock();
1347	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1348	+	lock.writeLock().unlock();
1349	+	t1.start();
1350	+	Thread.sleep(SHORT_DELAY_MS);
1351	+	t2.start();
1352	+	Thread.sleep(SHORT_DELAY_MS);
1353	+	lock.writeLock().lock();
1354	+	assertTrue(lock.hasWaiters(c));
1355	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1356	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1357	+	c.signalAll();
1358	+	lock.writeLock().unlock();
1359	+	Thread.sleep(SHORT_DELAY_MS);
1360	+	lock.writeLock().lock();
1361	+	assertFalse(lock.hasWaiters(c));
1362	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1363	+	lock.writeLock().unlock();
1364	+	t1.join(SHORT_DELAY_MS);
1365	+	t2.join(SHORT_DELAY_MS);
1366	+	assertFalse(t1.isAlive());
1367	+	assertFalse(t2.isAlive());
1368	+	}
1369	+	catch (Exception ex) {
1370	+	unexpectedException();
1371	+	}
1372	+	}
1373	+
1374	+	/**
1375	+	* toString indicates current lock state
1376	+	*/
1377	+	public void testToString() {
1378	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1379	+	String us = lock.toString();
1380	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1381	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1382	+	lock.writeLock().lock();
1383	+	String ws = lock.toString();
1384	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1385	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1386	+	lock.writeLock().unlock();
1387	+	lock.readLock().lock();
1388	+	lock.readLock().lock();
1389	+	String rs = lock.toString();
1390	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1391	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1392	+	}
1393	+
1394	+	/**
1395	+	* readLock.toString indicates current lock state
1396	+	*/
1397	+	public void testReadLockToString() {
1398	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1399	+	String us = lock.readLock().toString();
1400	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1401	+	lock.readLock().lock();
1402	+	lock.readLock().lock();
1403	+	String rs = lock.readLock().toString();
1404	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1405	+	}
1406	+
1407	+	/**
1408	+	* writeLock.toString indicates current lock state
1409	+	*/
1410	+	public void testWriteLockToString() {
1411	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1412	+	String us = lock.writeLock().toString();
1413	+	assertTrue(us.indexOf("Unlocked") >= 0);
1414	+	lock.writeLock().lock();
1415	+	String ls = lock.writeLock().toString();
1416	+	assertTrue(ls.indexOf("Locked") >= 0);
1417	+	}
1418
1419		}

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