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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.9 by dl, Mon Dec 22 00:48:56 2003 UTC vs.
Revision 1.32 by jsr166, Tue Nov 17 14:18:28 2009 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.*;
#	Line 13 | Line 14 | import java.util.*;
14
15		public class ReentrantReadWriteLockTest extends JSR166TestCase {
16		public static void main(String[] args) {
17	<	junit.textui.TestRunner.run (suite());
17	>	junit.textui.TestRunner.run (suite());
18		}
19		public static Test suite() {
20		return new TestSuite(ReentrantReadWriteLockTest.class);
#	Line 22 | Line 23 | public class ReentrantReadWriteLockTest
23		/**
24		* A runnable calling lockInterruptibly
25		*/
26	<	class InterruptibleLockRunnable implements Runnable {
26	>	class InterruptibleLockRunnable extends CheckedRunnable {
27		final ReentrantReadWriteLock lock;
28		InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
29	<	public void run() {
30	<	try {
30	<	lock.writeLock().lockInterruptibly();
31	<	} catch(InterruptedException success){}
29	>	public void realRun() throws InterruptedException {
30	>	lock.writeLock().lockInterruptibly();
31		}
32		}
33
#	Line 37 | Line 36 | public class ReentrantReadWriteLockTest
36		* A runnable calling lockInterruptibly that expects to be
37		* interrupted
38		*/
39	<	class InterruptedLockRunnable implements Runnable {
39	>	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
40		final ReentrantReadWriteLock lock;
41		InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
42	<	public void run() {
43	<	try {
45	<	lock.writeLock().lockInterruptibly();
46	<	threadShouldThrow();
47	<	} catch(InterruptedException success){}
42	>	public void realRun() throws InterruptedException {
43	>	lock.writeLock().lockInterruptibly();
44		}
45		}
46
#	Line 53 | Line 49 | public class ReentrantReadWriteLockTest
49		*/
50		static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
51		PublicReentrantReadWriteLock() { super(); }
52	<	public Collection<Thread> getQueuedThreads() {
53	<	return super.getQueuedThreads();
52	>	public Collection<Thread> getQueuedThreads() {
53	>	return super.getQueuedThreads();
54		}
55	<	public PublicCondition newCondition() {
56	<	return new PublicCondition(this);
61	<	}
62	<
63	<	static class PublicCondition extends ReentrantReadWriteLock.WriterConditionObject {
64	<	PublicCondition(PublicReentrantReadWriteLock l) { super(l); }
65	<	public Collection<Thread> getWaitingThreads() {
66	<	return super.getWaitingThreads();
67	<	}
55	>	public Collection<Thread> getWaitingThreads(Condition c) {
56	>	return super.getWaitingThreads(c);
57		}
69	–
58		}
59
60		/**
61		* Constructor sets given fairness, and is in unlocked state
62		*/
63	<	public void testConstructor() {
63	>	public void testConstructor() {
64		ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
65		assertFalse(rl.isFair());
66		assertFalse(rl.isWriteLocked());
#	Line 81 | Line 69 | public class ReentrantReadWriteLockTest
69		assertTrue(r2.isFair());
70		assertFalse(r2.isWriteLocked());
71		assertEquals(0, r2.getReadLockCount());
72	+	ReentrantReadWriteLock r3 = new ReentrantReadWriteLock(false);
73	+	assertFalse(r3.isFair());
74	+	assertFalse(r3.isWriteLocked());
75	+	assertEquals(0, r3.getReadLockCount());
76		}
77
78		/**
79		* write-locking and read-locking an unlocked lock succeed
80		*/
81	<	public void testLock() {
81	>	public void testLock() {
82		ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
83		rl.writeLock().lock();
84		assertTrue(rl.isWriteLocked());
85		assertTrue(rl.isWriteLockedByCurrentThread());
86	+	assertTrue(rl.writeLock().isHeldByCurrentThread());
87		assertEquals(0, rl.getReadLockCount());
88		rl.writeLock().unlock();
89		assertFalse(rl.isWriteLocked());
90		assertFalse(rl.isWriteLockedByCurrentThread());
91	+	assertFalse(rl.writeLock().isHeldByCurrentThread());
92		assertEquals(0, rl.getReadLockCount());
93		rl.readLock().lock();
94		assertFalse(rl.isWriteLocked());
#	Line 110 | Line 104 | public class ReentrantReadWriteLockTest
104		/**
105		* locking an unlocked fair lock succeeds
106		*/
107	<	public void testFairLock() {
107	>	public void testFairLock() {
108		ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
109		rl.writeLock().lock();
110		assertTrue(rl.isWriteLocked());
111		assertTrue(rl.isWriteLockedByCurrentThread());
112	+	assertTrue(rl.writeLock().isHeldByCurrentThread());
113		assertEquals(0, rl.getReadLockCount());
114		rl.writeLock().unlock();
115		assertFalse(rl.isWriteLocked());
116		assertFalse(rl.isWriteLockedByCurrentThread());
117	+	assertFalse(rl.writeLock().isHeldByCurrentThread());
118		assertEquals(0, rl.getReadLockCount());
119		rl.readLock().lock();
120		assertFalse(rl.isWriteLocked());
#	Line 133 | Line 129 | public class ReentrantReadWriteLockTest
129		/**
130		* getWriteHoldCount returns number of recursive holds
131		*/
132	<	public void testGetHoldCount() {
132	>	public void testGetWriteHoldCount() {
133		ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
134	<	for(int i = 1; i <= SIZE; i++) {
134	>	for (int i = 1; i <= SIZE; i++) {
135		lock.writeLock().lock();
136		assertEquals(i,lock.getWriteHoldCount());
137		}
138	<	for(int i = SIZE; i > 0; i--) {
138	>	for (int i = SIZE; i > 0; i--) {
139		lock.writeLock().unlock();
140		assertEquals(i-1,lock.getWriteHoldCount());
141		}
142		}
143	<
143	>
144	>	/**
145	>	* WriteLock.getHoldCount returns number of recursive holds
146	>	*/
147	>	public void testGetHoldCount() {
148	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
149	>	for (int i = 1; i <= SIZE; i++) {
150	>	lock.writeLock().lock();
151	>	assertEquals(i,lock.writeLock().getHoldCount());
152	>	}
153	>	for (int i = SIZE; i > 0; i--) {
154	>	lock.writeLock().unlock();
155	>	assertEquals(i-1,lock.writeLock().getHoldCount());
156	>	}
157	>	}
158	>
159	>	/**
160	>	* getReadHoldCount returns number of recursive holds
161	>	*/
162	>	public void testGetReadHoldCount() {
163	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
164	>	for (int i = 1; i <= SIZE; i++) {
165	>	lock.readLock().lock();
166	>	assertEquals(i,lock.getReadHoldCount());
167	>	}
168	>	for (int i = SIZE; i > 0; i--) {
169	>	lock.readLock().unlock();
170	>	assertEquals(i-1,lock.getReadHoldCount());
171	>	}
172	>	}
173	>
174
175		/**
176		* write-unlocking an unlocked lock throws IllegalMonitorStateException
177		*/
178	<	public void testUnlock_IllegalMonitorStateException() {
178	>	public void testUnlock_IllegalMonitorStateException() {
179		ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
180		try {
181		rl.writeLock().unlock();
182		shouldThrow();
183	<	} catch(IllegalMonitorStateException success){}
183	>	} catch (IllegalMonitorStateException success) {}
184		}
185
186
187		/**
188		* write-lockInterruptibly is interruptible
189		*/
190	<	public void testWriteLockInterruptibly_Interrupted() {
190	>	public void testWriteLockInterruptibly_Interrupted() throws Exception {
191		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
166	–	lock.writeLock().lock();
192		Thread t = new Thread(new Runnable() {
193		public void run() {
194		try {
195		lock.writeLock().lockInterruptibly();
196	<	threadShouldThrow();
197	<	} catch(InterruptedException success){}
196	>	lock.writeLock().unlock();
197	>	lock.writeLock().lockInterruptibly();
198	>	lock.writeLock().unlock();
199	>	} catch (InterruptedException success) {}
200		}
201		});
202	<	try {
203	<	t.start();
204	<	t.interrupt();
205	<	lock.writeLock().unlock();
206	<	t.join();
207	<	} catch(Exception e){
208	<	unexpectedException();
209	<	}
210	<	}
202	>
203	>	lock.writeLock().lock();
204	>	t.start();
205	>	Thread.sleep(SHORT_DELAY_MS);
206	>	t.interrupt();
207	>	Thread.sleep(SHORT_DELAY_MS);
208	>	lock.writeLock().unlock();
209	>	t.join();
210	>	}
211
212		/**
213	<	* timed write-trylock is interruptible
213	>	* timed write-tryLock is interruptible
214		*/
215	<	public void testWriteTryLock_Interrupted() {
215	>	public void testWriteTryLock_Interrupted() throws InterruptedException {
216		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
217		lock.writeLock().lock();
218		Thread t = new Thread(new Runnable() {
219		public void run() {
220		try {
221		lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
222	<	threadShouldThrow();
196	<	} catch(InterruptedException success){}
222	>	} catch (InterruptedException success) {}
223		}
224		});
225	<	try {
226	<	t.start();
227	<	t.interrupt();
228	<	lock.writeLock().unlock();
229	<	t.join();
204	<	} catch(Exception e){
205	<	unexpectedException();
206	<	}
225	>
226	>	t.start();
227	>	t.interrupt();
228	>	lock.writeLock().unlock();
229	>	t.join();
230		}
231
232		/**
233		* read-lockInterruptibly is interruptible
234		*/
235	<	public void testReadLockInterruptibly_Interrupted() {
235	>	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
236		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
237		lock.writeLock().lock();
238		Thread t = new Thread(new Runnable() {
239		public void run() {
240		try {
241		lock.readLock().lockInterruptibly();
242	<	threadShouldThrow();
220	<	} catch(InterruptedException success){}
242	>	} catch (InterruptedException success) {}
243		}
244		});
245	<	try {
246	<	t.start();
247	<	t.interrupt();
248	<	lock.writeLock().unlock();
249	<	t.join();
250	<	} catch(Exception e){
251	<	unexpectedException();
252	<	}
231	<	}
245	>
246	>	t.start();
247	>	Thread.sleep(SHORT_DELAY_MS);
248	>	t.interrupt();
249	>	Thread.sleep(SHORT_DELAY_MS);
250	>	lock.writeLock().unlock();
251	>	t.join();
252	>	}
253
254		/**
255	<	* timed read-trylock is interruptible
255	>	* timed read-tryLock is interruptible
256		*/
257	<	public void testReadTryLock_Interrupted() {
257	>	public void testReadTryLock_Interrupted() throws InterruptedException {
258		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
259		lock.writeLock().lock();
260		Thread t = new Thread(new Runnable() {
#	Line 241 | Line 262 | public class ReentrantReadWriteLockTest
262		try {
263		lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
264		threadShouldThrow();
265	<	} catch(InterruptedException success){}
265	>	} catch (InterruptedException success) {}
266		}
267		});
268	<	try {
269	<	t.start();
270	<	t.interrupt();
271	<	t.join();
251	<	} catch(Exception e){
252	<	unexpectedException();
253	<	}
268	>
269	>	t.start();
270	>	t.interrupt();
271	>	t.join();
272		}
273
274	<
274	>
275		/**
276	<	* write-trylock fails if locked
276	>	* write-tryLock fails if locked
277		*/
278	<	public void testWriteTryLockWhenLocked() {
278	>	public void testWriteTryLockWhenLocked() throws InterruptedException {
279		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
280		lock.writeLock().lock();
281		Thread t = new Thread(new Runnable() {
#	Line 265 | Line 283 | public class ReentrantReadWriteLockTest
283		threadAssertFalse(lock.writeLock().tryLock());
284		}
285		});
286	<	try {
287	<	t.start();
288	<	t.join();
289	<	lock.writeLock().unlock();
290	<	} catch(Exception e){
273	<	unexpectedException();
274	<	}
275	<	}
286	>
287	>	t.start();
288	>	t.join();
289	>	lock.writeLock().unlock();
290	>	}
291
292		/**
293	<	* read-trylock fails if locked
293	>	* read-tryLock fails if locked
294		*/
295	<	public void testReadTryLockWhenLocked() {
295	>	public void testReadTryLockWhenLocked() throws InterruptedException {
296		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
297		lock.writeLock().lock();
298		Thread t = new Thread(new Runnable() {
#	Line 285 | Line 300 | public class ReentrantReadWriteLockTest
300		threadAssertFalse(lock.readLock().tryLock());
301		}
302		});
303	<	try {
304	<	t.start();
305	<	t.join();
306	<	lock.writeLock().unlock();
307	<	} catch(Exception e){
293	<	unexpectedException();
294	<	}
295	<	}
303	>
304	>	t.start();
305	>	t.join();
306	>	lock.writeLock().unlock();
307	>	}
308
309		/**
310		* Multiple threads can hold a read lock when not write-locked
311		*/
312	<	public void testMultipleReadLocks() {
312	>	public void testMultipleReadLocks() throws InterruptedException {
313		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
314		lock.readLock().lock();
315		Thread t = new Thread(new Runnable() {
#	Line 306 | Line 318 | public class ReentrantReadWriteLockTest
318		lock.readLock().unlock();
319		}
320		});
321	<	try {
322	<	t.start();
323	<	t.join();
324	<	lock.readLock().unlock();
325	<	} catch(Exception e){
314	<	unexpectedException();
315	<	}
316	<	}
321	>
322	>	t.start();
323	>	t.join();
324	>	lock.readLock().unlock();
325	>	}
326
327		/**
328		* A writelock succeeds after reading threads unlock
329		*/
330	<	public void testWriteAfterMultipleReadLocks() {
330	>	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
331		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
332		lock.readLock().lock();
333		Thread t1 = new Thread(new Runnable() {
#	Line 334 | Line 343 | public class ReentrantReadWriteLockTest
343		}
344		});
345
346	<	try {
347	<	t1.start();
348	<	t2.start();
349	<	Thread.sleep(SHORT_DELAY_MS);
350	<	lock.readLock().unlock();
351	<	t1.join(MEDIUM_DELAY_MS);
352	<	t2.join(MEDIUM_DELAY_MS);
353	<	assertTrue(!t1.isAlive());
354	<	assertTrue(!t2.isAlive());
346	<
347	<	} catch(Exception e){
348	<	unexpectedException();
349	<	}
350	<	}
346	>	t1.start();
347	>	t2.start();
348	>	Thread.sleep(SHORT_DELAY_MS);
349	>	lock.readLock().unlock();
350	>	t1.join(MEDIUM_DELAY_MS);
351	>	t2.join(MEDIUM_DELAY_MS);
352	>	assertTrue(!t1.isAlive());
353	>	assertTrue(!t2.isAlive());
354	>	}
355
356		/**
357		* Readlocks succeed after a writing thread unlocks
358		*/
359	<	public void testReadAfterWriteLock() {
359	>	public void testReadAfterWriteLock() throws InterruptedException {
360		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
361		lock.writeLock().lock();
362		Thread t1 = new Thread(new Runnable() {
#	Line 368 | Line 372 | public class ReentrantReadWriteLockTest
372		}
373		});
374
375	<	try {
376	<	t1.start();
377	<	t2.start();
378	<	Thread.sleep(SHORT_DELAY_MS);
379	<	lock.writeLock().unlock();
380	<	t1.join(MEDIUM_DELAY_MS);
381	<	t2.join(MEDIUM_DELAY_MS);
382	<	assertTrue(!t1.isAlive());
383	<	assertTrue(!t2.isAlive());
384	<
385	<	} catch(Exception e){
386	<	unexpectedException();
387	<	}
388	<	}
375	>	t1.start();
376	>	t2.start();
377	>	Thread.sleep(SHORT_DELAY_MS);
378	>	lock.writeLock().unlock();
379	>	t1.join(MEDIUM_DELAY_MS);
380	>	t2.join(MEDIUM_DELAY_MS);
381	>	assertTrue(!t1.isAlive());
382	>	assertTrue(!t2.isAlive());
383	>	}
384	>
385	>	/**
386	>	* Read trylock succeeds if write locked by current thread
387	>	*/
388	>	public void testReadHoldingWriteLock() {
389	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
390	>	lock.writeLock().lock();
391	>	assertTrue(lock.readLock().tryLock());
392	>	lock.readLock().unlock();
393	>	lock.writeLock().unlock();
394	>	}
395	>
396	>	/**
397	>	* Read lock succeeds if write locked by current thread even if
398	>	* other threads are waiting for readlock
399	>	*/
400	>	public void testReadHoldingWriteLock2() throws InterruptedException {
401	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
402	>	lock.writeLock().lock();
403	>	Thread t1 = new Thread(new Runnable() {
404	>	public void run() {
405	>	lock.readLock().lock();
406	>	lock.readLock().unlock();
407	>	}
408	>	});
409	>	Thread t2 = new Thread(new Runnable() {
410	>	public void run() {
411	>	lock.readLock().lock();
412	>	lock.readLock().unlock();
413	>	}
414	>	});
415
416	+	t1.start();
417	+	t2.start();
418	+	lock.readLock().lock();
419	+	lock.readLock().unlock();
420	+	Thread.sleep(SHORT_DELAY_MS);
421	+	lock.readLock().lock();
422	+	lock.readLock().unlock();
423	+	lock.writeLock().unlock();
424	+	t1.join(MEDIUM_DELAY_MS);
425	+	t2.join(MEDIUM_DELAY_MS);
426	+	assertTrue(!t1.isAlive());
427	+	assertTrue(!t2.isAlive());
428	+	}
429
430		/**
431	<	* Read trylock succeeds if readlocked but not writelocked
431	>	*  Read lock succeeds if write locked by current thread even if
432	>	* other threads are waiting for writelock
433		*/
434	<	public void testTryLockWhenReadLocked() {
434	>	public void testReadHoldingWriteLock3() throws InterruptedException {
435	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
436	>	lock.writeLock().lock();
437	>	Thread t1 = new Thread(new Runnable() {
438	>	public void run() {
439	>	lock.writeLock().lock();
440	>	lock.writeLock().unlock();
441	>	}
442	>	});
443	>	Thread t2 = new Thread(new Runnable() {
444	>	public void run() {
445	>	lock.writeLock().lock();
446	>	lock.writeLock().unlock();
447	>	}
448	>	});
449	>
450	>	t1.start();
451	>	t2.start();
452	>	lock.readLock().lock();
453	>	lock.readLock().unlock();
454	>	Thread.sleep(SHORT_DELAY_MS);
455	>	lock.readLock().lock();
456	>	lock.readLock().unlock();
457	>	lock.writeLock().unlock();
458	>	t1.join(MEDIUM_DELAY_MS);
459	>	t2.join(MEDIUM_DELAY_MS);
460	>	assertTrue(!t1.isAlive());
461	>	assertTrue(!t2.isAlive());
462	>	}
463	>
464	>
465	>	/**
466	>	*  Write lock succeeds if write locked by current thread even if
467	>	* other threads are waiting for writelock
468	>	*/
469	>	public void testWriteHoldingWriteLock4() throws InterruptedException {
470	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
471	>	lock.writeLock().lock();
472	>	Thread t1 = new Thread(new Runnable() {
473	>	public void run() {
474	>	lock.writeLock().lock();
475	>	lock.writeLock().unlock();
476	>	}
477	>	});
478	>	Thread t2 = new Thread(new Runnable() {
479	>	public void run() {
480	>	lock.writeLock().lock();
481	>	lock.writeLock().unlock();
482	>	}
483	>	});
484	>
485	>	t1.start();
486	>	t2.start();
487	>	lock.writeLock().lock();
488	>	lock.writeLock().unlock();
489	>	Thread.sleep(SHORT_DELAY_MS);
490	>	lock.writeLock().lock();
491	>	lock.writeLock().unlock();
492	>	lock.writeLock().unlock();
493	>	t1.join(MEDIUM_DELAY_MS);
494	>	t2.join(MEDIUM_DELAY_MS);
495	>	assertTrue(!t1.isAlive());
496	>	assertTrue(!t2.isAlive());
497	>	}
498	>
499	>
500	>	/**
501	>	* Fair Read trylock succeeds if write locked by current thread
502	>	*/
503	>	public void testReadHoldingWriteLockFair() {
504	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
505	>	lock.writeLock().lock();
506	>	assertTrue(lock.readLock().tryLock());
507	>	lock.readLock().unlock();
508	>	lock.writeLock().unlock();
509	>	}
510	>
511	>	/**
512	>	* Fair Read lock succeeds if write locked by current thread even if
513	>	* other threads are waiting for readlock
514	>	*/
515	>	public void testReadHoldingWriteLockFair2() throws InterruptedException {
516	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
517	>	lock.writeLock().lock();
518	>	Thread t1 = new Thread(new Runnable() {
519	>	public void run() {
520	>	lock.readLock().lock();
521	>	lock.readLock().unlock();
522	>	}
523	>	});
524	>	Thread t2 = new Thread(new Runnable() {
525	>	public void run() {
526	>	lock.readLock().lock();
527	>	lock.readLock().unlock();
528	>	}
529	>	});
530	>
531	>	t1.start();
532	>	t2.start();
533	>	lock.readLock().lock();
534	>	lock.readLock().unlock();
535	>	Thread.sleep(SHORT_DELAY_MS);
536	>	lock.readLock().lock();
537	>	lock.readLock().unlock();
538	>	lock.writeLock().unlock();
539	>	t1.join(MEDIUM_DELAY_MS);
540	>	t2.join(MEDIUM_DELAY_MS);
541	>	assertTrue(!t1.isAlive());
542	>	assertTrue(!t2.isAlive());
543	>	}
544	>
545	>
546	>	/**
547	>	* Fair Read lock succeeds if write locked by current thread even if
548	>	* other threads are waiting for writelock
549	>	*/
550	>	public void testReadHoldingWriteLockFair3() throws InterruptedException {
551	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
552	>	lock.writeLock().lock();
553	>	Thread t1 = new Thread(new Runnable() {
554	>	public void run() {
555	>	lock.writeLock().lock();
556	>	lock.writeLock().unlock();
557	>	}
558	>	});
559	>	Thread t2 = new Thread(new Runnable() {
560	>	public void run() {
561	>	lock.writeLock().lock();
562	>	lock.writeLock().unlock();
563	>	}
564	>	});
565	>
566	>	t1.start();
567	>	t2.start();
568	>	lock.readLock().lock();
569	>	lock.readLock().unlock();
570	>	Thread.sleep(SHORT_DELAY_MS);
571	>	lock.readLock().lock();
572	>	lock.readLock().unlock();
573	>	lock.writeLock().unlock();
574	>	t1.join(MEDIUM_DELAY_MS);
575	>	t2.join(MEDIUM_DELAY_MS);
576	>	assertTrue(!t1.isAlive());
577	>	assertTrue(!t2.isAlive());
578	>	}
579	>
580	>
581	>	/**
582	>	* Fair Write lock succeeds if write locked by current thread even if
583	>	* other threads are waiting for writelock
584	>	*/
585	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
586	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
587	>	lock.writeLock().lock();
588	>	Thread t1 = new Thread(new Runnable() {
589	>	public void run() {
590	>	lock.writeLock().lock();
591	>	lock.writeLock().unlock();
592	>	}
593	>	});
594	>	Thread t2 = new Thread(new Runnable() {
595	>	public void run() {
596	>	lock.writeLock().lock();
597	>	lock.writeLock().unlock();
598	>	}
599	>	});
600	>
601	>	t1.start();
602	>	t2.start();
603	>	Thread.sleep(SHORT_DELAY_MS);
604	>	assertTrue(lock.isWriteLockedByCurrentThread());
605	>	assertTrue(lock.getWriteHoldCount() == 1);
606	>	lock.writeLock().lock();
607	>	assertTrue(lock.getWriteHoldCount() == 2);
608	>	lock.writeLock().unlock();
609	>	lock.writeLock().lock();
610	>	lock.writeLock().unlock();
611	>	lock.writeLock().unlock();
612	>	t1.join(MEDIUM_DELAY_MS);
613	>	t2.join(MEDIUM_DELAY_MS);
614	>	assertTrue(!t1.isAlive());
615	>	assertTrue(!t2.isAlive());
616	>	}
617	>
618	>
619	>	/**
620	>	* Read tryLock succeeds if readlocked but not writelocked
621	>	*/
622	>	public void testTryLockWhenReadLocked() throws InterruptedException {
623		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
624		lock.readLock().lock();
625		Thread t = new Thread(new Runnable() {
#	Line 396 | Line 628 | public class ReentrantReadWriteLockTest
628		lock.readLock().unlock();
629		}
630		});
399	–	try {
400	–	t.start();
401	–	t.join();
402	–	lock.readLock().unlock();
403	–	} catch(Exception e){
404	–	unexpectedException();
405	–	}
406	–	}
631
632	<
632	>	t.start();
633	>	t.join();
634	>	lock.readLock().unlock();
635	>	}
636	>
637	>
638
639		/**
640	<	* write trylock fails when readlocked
640	>	* write tryLock fails when readlocked
641		*/
642	<	public void testWriteTryLockWhenReadLocked() {
642	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
643		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
644		lock.readLock().lock();
645		Thread t = new Thread(new Runnable() {
#	Line 418 | Line 647 | public class ReentrantReadWriteLockTest
647		threadAssertFalse(lock.writeLock().tryLock());
648		}
649		});
421	–	try {
422	–	t.start();
423	–	t.join();
424	–	lock.readLock().unlock();
425	–	} catch(Exception e){
426	–	unexpectedException();
427	–	}
428	–	}
650
651	<
651	>	t.start();
652	>	t.join();
653	>	lock.readLock().unlock();
654	>	}
655	>
656	>
657	>	/**
658	>	* Fair Read tryLock succeeds if readlocked but not writelocked
659	>	*/
660	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
661	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
662	>	lock.readLock().lock();
663	>	Thread t = new Thread(new Runnable() {
664	>	public void run() {
665	>	threadAssertTrue(lock.readLock().tryLock());
666	>	lock.readLock().unlock();
667	>	}
668	>	});
669	>
670	>	t.start();
671	>	t.join();
672	>	lock.readLock().unlock();
673	>	}
674	>
675	>
676
677		/**
678	<	* write timed trylock times out if locked
678	>	* Fair write tryLock fails when readlocked
679		*/
680	<	public void testWriteTryLock_Timeout() {
680	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
681	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
682	>	lock.readLock().lock();
683	>	Thread t = new Thread(new Runnable() {
684	>	public void run() {
685	>	threadAssertFalse(lock.writeLock().tryLock());
686	>	}
687	>	});
688	>
689	>	t.start();
690	>	t.join();
691	>	lock.readLock().unlock();
692	>	}
693	>
694	>
695	>
696	>	/**
697	>	* write timed tryLock times out if locked
698	>	*/
699	>	public void testWriteTryLock_Timeout() throws InterruptedException {
700		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
701		lock.writeLock().lock();
702		Thread t = new Thread(new Runnable() {
#	Line 444 | Line 708 | public class ReentrantReadWriteLockTest
708		}
709		}
710		});
711	<	try {
712	<	t.start();
713	<	t.join();
714	<	lock.writeLock().unlock();
715	<	} catch(Exception e){
452	<	unexpectedException();
453	<	}
454	<	}
711	>
712	>	t.start();
713	>	t.join();
714	>	lock.writeLock().unlock();
715	>	}
716
717		/**
718	<	* read timed trylock times out if write-locked
718	>	* read timed tryLock times out if write-locked
719		*/
720	<	public void testReadTryLock_Timeout() {
720	>	public void testReadTryLock_Timeout() throws InterruptedException {
721		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
722		lock.writeLock().lock();
723		Thread t = new Thread(new Runnable() {
#	Line 468 | Line 729 | public class ReentrantReadWriteLockTest
729		}
730		}
731		});
732	<	try {
733	<	t.start();
734	<	t.join();
735	<	lock.writeLock().unlock();
736	<	} catch(Exception e){
476	<	unexpectedException();
477	<	}
478	<	}
732	>
733	>	t.start();
734	>	t.join();
735	>	lock.writeLock().unlock();
736	>	}
737
738
739		/**
740		* write lockInterruptibly succeeds if lock free else is interruptible
741		*/
742	<	public void testWriteLockInterruptibly() {
742	>	public void testWriteLockInterruptibly() throws InterruptedException {
743		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
744	<	try {
745	<	lock.writeLock().lockInterruptibly();
488	<	} catch(Exception e) {
489	<	unexpectedException();
490	<	}
491	<	Thread t = new Thread(new Runnable() {
744	>	lock.writeLock().lockInterruptibly();
745	>	Thread t = new Thread(new Runnable() {
746		public void run() {
747		try {
748		lock.writeLock().lockInterruptibly();
749		threadShouldThrow();
750		}
751	<	catch(InterruptedException success) {
751	>	catch (InterruptedException success) {
752		}
753		}
754		});
755	<	try {
756	<	t.start();
757	<	t.interrupt();
758	<	t.join();
759	<	lock.writeLock().unlock();
760	<	} catch(Exception e){
761	<	unexpectedException();
508	<	}
755	>
756	>	t.start();
757	>	Thread.sleep(SHORT_DELAY_MS);
758	>	t.interrupt();
759	>	Thread.sleep(SHORT_DELAY_MS);
760	>	t.join();
761	>	lock.writeLock().unlock();
762		}
763
764		/**
765		*  read lockInterruptibly succeeds if lock free else is interruptible
766		*/
767	<	public void testReadLockInterruptibly() {
767	>	public void testReadLockInterruptibly() throws InterruptedException {
768		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
769	<	try {
770	<	lock.writeLock().lockInterruptibly();
518	<	} catch(Exception e) {
519	<	unexpectedException();
520	<	}
521	<	Thread t = new Thread(new Runnable() {
769	>	lock.writeLock().lockInterruptibly();
770	>	Thread t = new Thread(new Runnable() {
771		public void run() {
772		try {
773		lock.readLock().lockInterruptibly();
774		threadShouldThrow();
775		}
776	<	catch(InterruptedException success) {
776	>	catch (InterruptedException success) {
777		}
778		}
779		});
780	<	try {
781	<	t.start();
782	<	t.interrupt();
783	<	t.join();
784	<	lock.writeLock().unlock();
785	<	} catch(Exception e){
537	<	unexpectedException();
538	<	}
780	>
781	>	t.start();
782	>	Thread.sleep(SHORT_DELAY_MS);
783	>	t.interrupt();
784	>	t.join();
785	>	lock.writeLock().unlock();
786		}
787
788		/**
789		* Calling await without holding lock throws IllegalMonitorStateException
790		*/
791	<	public void testAwait_IllegalMonitor() {
792	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
791	>	public void testAwait_IllegalMonitor() throws InterruptedException {
792	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
793		final Condition c = lock.writeLock().newCondition();
794		try {
795		c.await();
796		shouldThrow();
797	<	}
551	<	catch (IllegalMonitorStateException success) {
552	<	}
553	<	catch (Exception ex) {
554	<	shouldThrow();
555	<	}
797	>	} catch (IllegalMonitorStateException success) {}
798		}
799
800		/**
801		* Calling signal without holding lock throws IllegalMonitorStateException
802		*/
803		public void testSignal_IllegalMonitor() {
804	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
804	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
805		final Condition c = lock.writeLock().newCondition();
806		try {
807		c.signal();
808		shouldThrow();
809	<	}
568	<	catch (IllegalMonitorStateException success) {
569	<	}
570	<	catch (Exception ex) {
571	<	unexpectedException();
572	<	}
809	>	} catch (IllegalMonitorStateException success) {}
810		}
811
812		/**
813		* awaitNanos without a signal times out
814		*/
815	<	public void testAwaitNanos_Timeout() {
816	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
815	>	public void testAwaitNanos_Timeout() throws InterruptedException {
816	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
817		final Condition c = lock.writeLock().newCondition();
818	<	try {
819	<	lock.writeLock().lock();
820	<	long t = c.awaitNanos(100);
821	<	assertTrue(t <= 0);
822	<	lock.writeLock().unlock();
586	<	}
587	<	catch (Exception ex) {
588	<	unexpectedException();
589	<	}
818	>
819	>	lock.writeLock().lock();
820	>	long t = c.awaitNanos(100);
821	>	assertTrue(t <= 0);
822	>	lock.writeLock().unlock();
823		}
824
825
#	Line 594 | Line 827 | public class ReentrantReadWriteLockTest
827		*  timed await without a signal times out
828		*/
829		public void testAwait_Timeout() {
830	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
830	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
831		final Condition c = lock.writeLock().newCondition();
832	<	try {
833	<	lock.writeLock().lock();
601	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
602	<	lock.writeLock().unlock();
603	<	}
604	<	catch (Exception ex) {
605	<	unexpectedException();
606	<	}
832	>	lock.writeLock().lock();
833	>	lock.writeLock().unlock();
834		}
835
836		/**
837		* awaitUntil without a signal times out
838		*/
839		public void testAwaitUntil_Timeout() {
840	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
840	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
841		final Condition c = lock.writeLock().newCondition();
842	<	try {
843	<	lock.writeLock().lock();
844	<	java.util.Date d = new java.util.Date();
618	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
619	<	lock.writeLock().unlock();
620	<	}
621	<	catch (Exception ex) {
622	<	unexpectedException();
623	<	}
842	>	lock.writeLock().lock();
843	>	java.util.Date d = new java.util.Date();
844	>	lock.writeLock().unlock();
845		}
846
847		/**
848		* await returns when signalled
849		*/
850	<	public void testAwait() {
851	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
850	>	public void testAwait() throws InterruptedException {
851	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
852		final Condition c = lock.writeLock().newCondition();
853	<	Thread t = new Thread(new Runnable() {
853	>	Thread t = new Thread(new Runnable() {
854		public void run() {
855		try {
856		lock.writeLock().lock();
857		c.await();
858		lock.writeLock().unlock();
859		}
860	<	catch(InterruptedException e) {
860	>	catch (InterruptedException e) {
861		threadUnexpectedException();
862		}
863		}
864		});
865
866	<	try {
867	<	t.start();
868	<	Thread.sleep(SHORT_DELAY_MS);
869	<	lock.writeLock().lock();
870	<	c.signal();
871	<	lock.writeLock().unlock();
872	<	t.join(SHORT_DELAY_MS);
873	<	assertFalse(t.isAlive());
874	<	}
875	<	catch (Exception ex) {
876	<	unexpectedException();
866	>	t.start();
867	>	Thread.sleep(SHORT_DELAY_MS);
868	>	lock.writeLock().lock();
869	>	c.signal();
870	>	lock.writeLock().unlock();
871	>	t.join(SHORT_DELAY_MS);
872	>	assertFalse(t.isAlive());
873	>	}
874	>
875	>	/** A helper class for uninterruptible wait tests */
876	>	class UninterruptableThread extends Thread {
877	>	private Lock lock;
878	>	private Condition c;
879	>
880	>	public volatile boolean canAwake = false;
881	>	public volatile boolean interrupted = false;
882	>	public volatile boolean lockStarted = false;
883	>
884	>	public UninterruptableThread(Lock lock, Condition c) {
885	>	this.lock = lock;
886	>	this.c = c;
887	>	}
888	>
889	>	public synchronized void run() {
890	>	lock.lock();
891	>	lockStarted = true;
892	>
893	>	while (!canAwake) {
894	>	c.awaitUninterruptibly();
895	>	}
896	>
897	>	interrupted = isInterrupted();
898	>	lock.unlock();
899		}
900		}
901
902		/**
903		* awaitUninterruptibly doesn't abort on interrupt
904		*/
905	<	public void testAwaitUninterruptibly() {
906	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
905	>	public void testAwaitUninterruptibly() throws InterruptedException {
906	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
907		final Condition c = lock.writeLock().newCondition();
908	<	Thread t = new Thread(new Runnable() {
909	<	public void run() {
910	<	lock.writeLock().lock();
911	<	c.awaitUninterruptibly();
912	<	lock.writeLock().unlock();
913	<	}
914	<	});
908	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
909	>
910	>	thread.start();
911	>
912	>	while (!thread.lockStarted) {
913	>	Thread.sleep(100);
914	>	}
915
916	+	lock.writeLock().lock();
917		try {
918	<	t.start();
919	<	Thread.sleep(SHORT_DELAY_MS);
676	<	t.interrupt();
677	<	lock.writeLock().lock();
918	>	thread.interrupt();
919	>	thread.canAwake = true;
920		c.signal();
921	+	} finally {
922		lock.writeLock().unlock();
680	–	assert(t.isInterrupted());
681	–	t.join(SHORT_DELAY_MS);
682	–	assertFalse(t.isAlive());
683	–	}
684	–	catch (Exception ex) {
685	–	unexpectedException();
923		}
924	+
925	+	thread.join();
926	+	assertTrue(thread.interrupted);
927	+	assertFalse(thread.isAlive());
928		}
929
930		/**
931		* await is interruptible
932		*/
933	<	public void testAwait_Interrupt() {
934	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
933	>	public void testAwait_Interrupt() throws InterruptedException {
934	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
935		final Condition c = lock.writeLock().newCondition();
936	<	Thread t = new Thread(new Runnable() {
936	>	Thread t = new Thread(new Runnable() {
937		public void run() {
938		try {
939		lock.writeLock().lock();
#	Line 700 | Line 941 | public class ReentrantReadWriteLockTest
941		lock.writeLock().unlock();
942		threadShouldThrow();
943		}
944	<	catch(InterruptedException success) {
944	>	catch (InterruptedException success) {
945		}
946		}
947		});
948
949	<	try {
950	<	t.start();
951	<	Thread.sleep(SHORT_DELAY_MS);
952	<	t.interrupt();
953	<	t.join(SHORT_DELAY_MS);
713	<	assertFalse(t.isAlive());
714	<	}
715	<	catch (Exception ex) {
716	<	unexpectedException();
717	<	}
949	>	t.start();
950	>	Thread.sleep(SHORT_DELAY_MS);
951	>	t.interrupt();
952	>	t.join(SHORT_DELAY_MS);
953	>	assertFalse(t.isAlive());
954		}
955
956		/**
957		* awaitNanos is interruptible
958		*/
959	<	public void testAwaitNanos_Interrupt() {
960	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
959	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
960	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
961		final Condition c = lock.writeLock().newCondition();
962	<	Thread t = new Thread(new Runnable() {
962	>	Thread t = new Thread(new Runnable() {
963		public void run() {
964		try {
965		lock.writeLock().lock();
#	Line 731 | Line 967 | public class ReentrantReadWriteLockTest
967		lock.writeLock().unlock();
968		threadShouldThrow();
969		}
970	<	catch(InterruptedException success) {
970	>	catch (InterruptedException success) {
971		}
972		}
973		});
974
975	<	try {
976	<	t.start();
977	<	Thread.sleep(SHORT_DELAY_MS);
978	<	t.interrupt();
979	<	t.join(SHORT_DELAY_MS);
744	<	assertFalse(t.isAlive());
745	<	}
746	<	catch (Exception ex) {
747	<	unexpectedException();
748	<	}
975	>	t.start();
976	>	Thread.sleep(SHORT_DELAY_MS);
977	>	t.interrupt();
978	>	t.join(SHORT_DELAY_MS);
979	>	assertFalse(t.isAlive());
980		}
981
982		/**
983		* awaitUntil is interruptible
984		*/
985	<	public void testAwaitUntil_Interrupt() {
986	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
985	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
986	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
987		final Condition c = lock.writeLock().newCondition();
988	<	Thread t = new Thread(new Runnable() {
988	>	Thread t = new Thread(new Runnable() {
989		public void run() {
990		try {
991		lock.writeLock().lock();
#	Line 763 | Line 994 | public class ReentrantReadWriteLockTest
994		lock.writeLock().unlock();
995		threadShouldThrow();
996		}
997	<	catch(InterruptedException success) {
997	>	catch (InterruptedException success) {
998		}
999		}
1000		});
1001
1002	<	try {
1003	<	t.start();
1004	<	Thread.sleep(SHORT_DELAY_MS);
1005	<	t.interrupt();
1006	<	t.join(SHORT_DELAY_MS);
776	<	assertFalse(t.isAlive());
777	<	}
778	<	catch (Exception ex) {
779	<	unexpectedException();
780	<	}
1002	>	t.start();
1003	>	Thread.sleep(SHORT_DELAY_MS);
1004	>	t.interrupt();
1005	>	t.join(SHORT_DELAY_MS);
1006	>	assertFalse(t.isAlive());
1007		}
1008
1009		/**
1010		* signalAll wakes up all threads
1011		*/
1012	<	public void testSignalAll() {
1013	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1012	>	public void testSignalAll() throws InterruptedException {
1013	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1014		final Condition c = lock.writeLock().newCondition();
1015	<	Thread t1 = new Thread(new Runnable() {
1015	>	Thread t1 = new Thread(new Runnable() {
1016		public void run() {
1017		try {
1018		lock.writeLock().lock();
1019		c.await();
1020		lock.writeLock().unlock();
1021		}
1022	<	catch(InterruptedException e) {
1022	>	catch (InterruptedException e) {
1023		threadUnexpectedException();
1024		}
1025		}
1026		});
1027
1028	<	Thread t2 = new Thread(new Runnable() {
1028	>	Thread t2 = new Thread(new Runnable() {
1029		public void run() {
1030		try {
1031		lock.writeLock().lock();
1032		c.await();
1033		lock.writeLock().unlock();
1034		}
1035	<	catch(InterruptedException e) {
1035	>	catch (InterruptedException e) {
1036		threadUnexpectedException();
1037		}
1038		}
1039		});
1040
1041	<	try {
1042	<	t1.start();
1043	<	t2.start();
1044	<	Thread.sleep(SHORT_DELAY_MS);
1045	<	lock.writeLock().lock();
1046	<	c.signalAll();
1047	<	lock.writeLock().unlock();
1048	<	t1.join(SHORT_DELAY_MS);
1049	<	t2.join(SHORT_DELAY_MS);
1050	<	assertFalse(t1.isAlive());
825	<	assertFalse(t2.isAlive());
826	<	}
827	<	catch (Exception ex) {
828	<	unexpectedException();
829	<	}
1041	>	t1.start();
1042	>	t2.start();
1043	>	Thread.sleep(SHORT_DELAY_MS);
1044	>	lock.writeLock().lock();
1045	>	c.signalAll();
1046	>	lock.writeLock().unlock();
1047	>	t1.join(SHORT_DELAY_MS);
1048	>	t2.join(SHORT_DELAY_MS);
1049	>	assertFalse(t1.isAlive());
1050	>	assertFalse(t2.isAlive());
1051		}
1052
1053		/**
1054		* A serialized lock deserializes as unlocked
1055		*/
1056	<	public void testSerialization() {
1056	>	public void testSerialization() throws Exception {
1057		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
1058		l.readLock().lock();
1059		l.readLock().unlock();
1060
1061	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1062	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1063	+	out.writeObject(l);
1064	+	out.close();
1065	+
1066	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1067	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1068	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1069	+	r.readLock().lock();
1070	+	r.readLock().unlock();
1071	+	}
1072	+
1073	+	/**
1074	+	* hasQueuedThreads reports whether there are waiting threads
1075	+	*/
1076	+	public void testhasQueuedThreads() throws InterruptedException {
1077	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1078	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1079	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1080	+	assertFalse(lock.hasQueuedThreads());
1081	+	lock.writeLock().lock();
1082	+	t1.start();
1083	+	Thread.sleep(SHORT_DELAY_MS);
1084	+	assertTrue(lock.hasQueuedThreads());
1085	+	t2.start();
1086	+	Thread.sleep(SHORT_DELAY_MS);
1087	+	assertTrue(lock.hasQueuedThreads());
1088	+	t1.interrupt();
1089	+	Thread.sleep(SHORT_DELAY_MS);
1090	+	assertTrue(lock.hasQueuedThreads());
1091	+	lock.writeLock().unlock();
1092	+	Thread.sleep(SHORT_DELAY_MS);
1093	+	assertFalse(lock.hasQueuedThreads());
1094	+	t1.join();
1095	+	t2.join();
1096	+	}
1097	+
1098	+	/**
1099	+	* hasQueuedThread(null) throws NPE
1100	+	*/
1101	+	public void testHasQueuedThreadNPE() {
1102	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1103		try {
1104	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1105	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1106	<	out.writeObject(l);
844	<	out.close();
845	<
846	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
847	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
848	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
849	<	r.readLock().lock();
850	<	r.readLock().unlock();
851	<	} catch(Exception e){
852	<	e.printStackTrace();
853	<	unexpectedException();
1104	>	sync.hasQueuedThread(null);
1105	>	shouldThrow();
1106	>	} catch (NullPointerException success) {
1107		}
1108		}
1109
1110		/**
1111	+	* hasQueuedThread reports whether a thread is queued.
1112	+	*/
1113	+	public void testHasQueuedThread() throws InterruptedException {
1114	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1115	+	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1116	+	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1117	+	assertFalse(sync.hasQueuedThread(t1));
1118	+	assertFalse(sync.hasQueuedThread(t2));
1119	+	sync.writeLock().lock();
1120	+	t1.start();
1121	+	Thread.sleep(SHORT_DELAY_MS);
1122	+	assertTrue(sync.hasQueuedThread(t1));
1123	+	t2.start();
1124	+	Thread.sleep(SHORT_DELAY_MS);
1125	+	assertTrue(sync.hasQueuedThread(t1));
1126	+	assertTrue(sync.hasQueuedThread(t2));
1127	+	t1.interrupt();
1128	+	Thread.sleep(SHORT_DELAY_MS);
1129	+	assertFalse(sync.hasQueuedThread(t1));
1130	+	assertTrue(sync.hasQueuedThread(t2));
1131	+	sync.writeLock().unlock();
1132	+	Thread.sleep(SHORT_DELAY_MS);
1133	+	assertFalse(sync.hasQueuedThread(t1));
1134	+	Thread.sleep(SHORT_DELAY_MS);
1135	+	assertFalse(sync.hasQueuedThread(t2));
1136	+	t1.join();
1137	+	t2.join();
1138	+	}
1139	+
1140	+
1141	+	/**
1142		* getQueueLength reports number of waiting threads
1143		*/
1144	<	public void testGetQueueLength() {
1144	>	public void testGetQueueLength() throws InterruptedException {
1145		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1146		Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1147		Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1148	<	try {
1149	<	assertEquals(0, lock.getQueueLength());
1150	<	lock.writeLock().lock();
1151	<	t1.start();
1152	<	Thread.sleep(SHORT_DELAY_MS);
1153	<	assertEquals(1, lock.getQueueLength());
1154	<	t2.start();
1155	<	Thread.sleep(SHORT_DELAY_MS);
1156	<	assertEquals(2, lock.getQueueLength());
1157	<	t1.interrupt();
1158	<	Thread.sleep(SHORT_DELAY_MS);
1159	<	assertEquals(1, lock.getQueueLength());
1160	<	lock.writeLock().unlock();
1161	<	Thread.sleep(SHORT_DELAY_MS);
1162	<	assertEquals(0, lock.getQueueLength());
1163	<	t1.join();
1164	<	t2.join();
881	<	} catch(Exception e){
882	<	unexpectedException();
883	<	}
884	<	}
1148	>	assertEquals(0, lock.getQueueLength());
1149	>	lock.writeLock().lock();
1150	>	t1.start();
1151	>	Thread.sleep(SHORT_DELAY_MS);
1152	>	assertEquals(1, lock.getQueueLength());
1153	>	t2.start();
1154	>	Thread.sleep(SHORT_DELAY_MS);
1155	>	assertEquals(2, lock.getQueueLength());
1156	>	t1.interrupt();
1157	>	Thread.sleep(SHORT_DELAY_MS);
1158	>	assertEquals(1, lock.getQueueLength());
1159	>	lock.writeLock().unlock();
1160	>	Thread.sleep(SHORT_DELAY_MS);
1161	>	assertEquals(0, lock.getQueueLength());
1162	>	t1.join();
1163	>	t2.join();
1164	>	}
1165
1166		/**
1167		* getQueuedThreads includes waiting threads
1168		*/
1169	<	public void testGetQueuedThreads() {
1169	>	public void testGetQueuedThreads() throws InterruptedException {
1170		final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1171		Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1172		Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1173	+	assertTrue(lock.getQueuedThreads().isEmpty());
1174	+	lock.writeLock().lock();
1175	+	assertTrue(lock.getQueuedThreads().isEmpty());
1176	+	t1.start();
1177	+	Thread.sleep(SHORT_DELAY_MS);
1178	+	assertTrue(lock.getQueuedThreads().contains(t1));
1179	+	t2.start();
1180	+	Thread.sleep(SHORT_DELAY_MS);
1181	+	assertTrue(lock.getQueuedThreads().contains(t1));
1182	+	assertTrue(lock.getQueuedThreads().contains(t2));
1183	+	t1.interrupt();
1184	+	Thread.sleep(SHORT_DELAY_MS);
1185	+	assertFalse(lock.getQueuedThreads().contains(t1));
1186	+	assertTrue(lock.getQueuedThreads().contains(t2));
1187	+	lock.writeLock().unlock();
1188	+	Thread.sleep(SHORT_DELAY_MS);
1189	+	assertTrue(lock.getQueuedThreads().isEmpty());
1190	+	t1.join();
1191	+	t2.join();
1192	+	}
1193	+
1194	+	/**
1195	+	* hasWaiters throws NPE if null
1196	+	*/
1197	+	public void testHasWaitersNPE() {
1198	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1199		try {
1200	<	assertTrue(lock.getQueuedThreads().isEmpty());
1201	<	lock.writeLock().lock();
1202	<	assertTrue(lock.getQueuedThreads().isEmpty());
1203	<	t1.start();
898	<	Thread.sleep(SHORT_DELAY_MS);
899	<	assertTrue(lock.getQueuedThreads().contains(t1));
900	<	t2.start();
901	<	Thread.sleep(SHORT_DELAY_MS);
902	<	assertTrue(lock.getQueuedThreads().contains(t1));
903	<	assertTrue(lock.getQueuedThreads().contains(t2));
904	<	t1.interrupt();
905	<	Thread.sleep(SHORT_DELAY_MS);
906	<	assertFalse(lock.getQueuedThreads().contains(t1));
907	<	assertTrue(lock.getQueuedThreads().contains(t2));
908	<	lock.writeLock().unlock();
909	<	Thread.sleep(SHORT_DELAY_MS);
910	<	assertTrue(lock.getQueuedThreads().isEmpty());
911	<	t1.join();
912	<	t2.join();
913	<	} catch(Exception e){
914	<	unexpectedException();
915	<	}
916	<	}
1200	>	lock.hasWaiters(null);
1201	>	shouldThrow();
1202	>	} catch (NullPointerException success) {}
1203	>	}
1204
1205		/**
1206	<	* hasWaiters returns true when a thread is waiting, else false
1206	>	* getWaitQueueLength throws NPE if null
1207		*/
1208	<	public void testHasWaiters() {
1209	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1210	<	final ReentrantReadWriteLock.WriterConditionObject c = (ReentrantReadWriteLock.WriterConditionObject)(lock.writeLock().newCondition());
1211	<	Thread t = new Thread(new Runnable() {
1212	<	public void run() {
1213	<	try {
1214	<	lock.writeLock().lock();
1215	<	threadAssertFalse(c.hasWaiters());
1216	<	threadAssertEquals(0, c.getWaitQueueLength());
1217	<	c.await();
1218	<	lock.writeLock().unlock();
1219	<	}
1220	<	catch(InterruptedException e) {
1221	<	threadUnexpectedException();
1222	<	}
1223	<	}
1224	<	});
1208	>	public void testGetWaitQueueLengthNPE() {
1209	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1210	>	try {
1211	>	lock.getWaitQueueLength(null);
1212	>	shouldThrow();
1213	>	} catch (NullPointerException success) {}
1214	>	}
1215	>
1216	>
1217	>	/**
1218	>	* getWaitingThreads throws NPE if null
1219	>	*/
1220	>	public void testGetWaitingThreadsNPE() {
1221	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1222	>	try {
1223	>	lock.getWaitingThreads(null);
1224	>	shouldThrow();
1225	>	} catch (NullPointerException success) {}
1226	>	}
1227
1228	+	/**
1229	+	* hasWaiters throws IAE if not owned
1230	+	*/
1231	+	public void testHasWaitersIAE() {
1232	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1233	+	final Condition c = lock.writeLock().newCondition();
1234	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1235		try {
1236	<	t.start();
1237	<	Thread.sleep(SHORT_DELAY_MS);
1238	<	lock.writeLock().lock();
943	<	assertTrue(c.hasWaiters());
944	<	assertEquals(1, c.getWaitQueueLength());
945	<	c.signal();
946	<	lock.writeLock().unlock();
947	<	Thread.sleep(SHORT_DELAY_MS);
948	<	lock.writeLock().lock();
949	<	assertFalse(c.hasWaiters());
950	<	assertEquals(0, c.getWaitQueueLength());
951	<	lock.writeLock().unlock();
952	<	t.join(SHORT_DELAY_MS);
953	<	assertFalse(t.isAlive());
954	<	}
955	<	catch (Exception ex) {
956	<	unexpectedException();
957	<	}
1236	>	lock2.hasWaiters(c);
1237	>	shouldThrow();
1238	>	} catch (IllegalArgumentException success) {}
1239		}
1240
1241		/**
1242	<	* getWaitQueueLength returns number of waiting threads
1242	>	* hasWaiters throws IMSE if not locked
1243		*/
1244	<	public void testGetWaitQueueLength() {
1245	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1246	<	final ReentrantReadWriteLock.WriterConditionObject c = (ReentrantReadWriteLock.WriterConditionObject)(lock.writeLock().newCondition());
1247	<	Thread t1 = new Thread(new Runnable() {
1244	>	public void testHasWaitersIMSE() {
1245	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1246	>	final Condition c = lock.writeLock().newCondition();
1247	>	try {
1248	>	lock.hasWaiters(c);
1249	>	shouldThrow();
1250	>	} catch (IllegalMonitorStateException success) {}
1251	>	}
1252	>
1253	>
1254	>	/**
1255	>	* getWaitQueueLength throws IAE if not owned
1256	>	*/
1257	>	public void testGetWaitQueueLengthIAE() {
1258	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1259	>	final Condition c = lock.writeLock().newCondition();
1260	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1261	>	try {
1262	>	lock2.getWaitQueueLength(c);
1263	>	shouldThrow();
1264	>	} catch (IllegalArgumentException success) {}
1265	>	}
1266	>
1267	>	/**
1268	>	* getWaitQueueLength throws IMSE if not locked
1269	>	*/
1270	>	public void testGetWaitQueueLengthIMSE() {
1271	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1272	>	final Condition c = lock.writeLock().newCondition();
1273	>	try {
1274	>	lock.getWaitQueueLength(c);
1275	>	shouldThrow();
1276	>	} catch (IllegalMonitorStateException success) {}
1277	>	}
1278	>
1279	>
1280	>	/**
1281	>	* getWaitingThreads throws IAE if not owned
1282	>	*/
1283	>	public void testGetWaitingThreadsIAE() {
1284	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1285	>	final Condition c = lock.writeLock().newCondition();
1286	>	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1287	>	try {
1288	>	lock2.getWaitingThreads(c);
1289	>	shouldThrow();
1290	>	} catch (IllegalArgumentException success) {}
1291	>	}
1292	>
1293	>	/**
1294	>	* getWaitingThreads throws IMSE if not locked
1295	>	*/
1296	>	public void testGetWaitingThreadsIMSE() {
1297	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1298	>	final Condition c = lock.writeLock().newCondition();
1299	>	try {
1300	>	lock.getWaitingThreads(c);
1301	>	shouldThrow();
1302	>	} catch (IllegalMonitorStateException success) {}
1303	>	}
1304	>
1305	>
1306	>	/**
1307	>	* hasWaiters returns true when a thread is waiting, else false
1308	>	*/
1309	>	public void testHasWaiters() throws InterruptedException {
1310	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1311	>	final Condition c = lock.writeLock().newCondition();
1312	>	Thread t = new Thread(new Runnable() {
1313		public void run() {
1314		try {
1315		lock.writeLock().lock();
1316	<	threadAssertFalse(c.hasWaiters());
1317	<	threadAssertEquals(0, c.getWaitQueueLength());
1316	>	threadAssertFalse(lock.hasWaiters(c));
1317	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1318		c.await();
1319		lock.writeLock().unlock();
1320		}
1321	<	catch(InterruptedException e) {
1321	>	catch (InterruptedException e) {
1322		threadUnexpectedException();
1323		}
1324		}
1325		});
1326
1327	<	Thread t2 = new Thread(new Runnable() {
1327	>	t.start();
1328	>	Thread.sleep(SHORT_DELAY_MS);
1329	>	lock.writeLock().lock();
1330	>	assertTrue(lock.hasWaiters(c));
1331	>	assertEquals(1, lock.getWaitQueueLength(c));
1332	>	c.signal();
1333	>	lock.writeLock().unlock();
1334	>	Thread.sleep(SHORT_DELAY_MS);
1335	>	lock.writeLock().lock();
1336	>	assertFalse(lock.hasWaiters(c));
1337	>	assertEquals(0, lock.getWaitQueueLength(c));
1338	>	lock.writeLock().unlock();
1339	>	t.join(SHORT_DELAY_MS);
1340	>	assertFalse(t.isAlive());
1341	>	}
1342	>
1343	>	/**
1344	>	* getWaitQueueLength returns number of waiting threads
1345	>	*/
1346	>	public void testGetWaitQueueLength() throws InterruptedException {
1347	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1348	>	final Condition c = lock.writeLock().newCondition();
1349	>	Thread t = new Thread(new Runnable() {
1350		public void run() {
1351		try {
1352		lock.writeLock().lock();
1353	<	threadAssertTrue(c.hasWaiters());
1354	<	threadAssertEquals(1, c.getWaitQueueLength());
1353	>	threadAssertFalse(lock.hasWaiters(c));
1354	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1355		c.await();
1356		lock.writeLock().unlock();
1357		}
1358	<	catch(InterruptedException e) {
1358	>	catch (InterruptedException e) {
1359		threadUnexpectedException();
1360		}
1361		}
1362		});
1363
1364	<	try {
1365	<	t1.start();
1366	<	Thread.sleep(SHORT_DELAY_MS);
1367	<	t2.start();
1368	<	Thread.sleep(SHORT_DELAY_MS);
1369	<	lock.writeLock().lock();
1370	<	assertTrue(c.hasWaiters());
1371	<	assertEquals(2, c.getWaitQueueLength());
1372	<	c.signalAll();
1373	<	lock.writeLock().unlock();
1374	<	Thread.sleep(SHORT_DELAY_MS);
1375	<	lock.writeLock().lock();
1376	<	assertFalse(c.hasWaiters());
1377	<	assertEquals(0, c.getWaitQueueLength());
1010	<	lock.writeLock().unlock();
1011	<	t1.join(SHORT_DELAY_MS);
1012	<	t2.join(SHORT_DELAY_MS);
1013	<	assertFalse(t1.isAlive());
1014	<	assertFalse(t2.isAlive());
1015	<	}
1016	<	catch (Exception ex) {
1017	<	unexpectedException();
1018	<	}
1364	>	t.start();
1365	>	Thread.sleep(SHORT_DELAY_MS);
1366	>	lock.writeLock().lock();
1367	>	assertTrue(lock.hasWaiters(c));
1368	>	assertEquals(1, lock.getWaitQueueLength(c));
1369	>	c.signal();
1370	>	lock.writeLock().unlock();
1371	>	Thread.sleep(SHORT_DELAY_MS);
1372	>	lock.writeLock().lock();
1373	>	assertFalse(lock.hasWaiters(c));
1374	>	assertEquals(0, lock.getWaitQueueLength(c));
1375	>	lock.writeLock().unlock();
1376	>	t.join(SHORT_DELAY_MS);
1377	>	assertFalse(t.isAlive());
1378		}
1379
1380	+
1381		/**
1382		* getWaitingThreads returns only and all waiting threads
1383		*/
1384	<	public void testGetWaitingThreads() {
1385	<	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1386	<	final PublicReentrantReadWriteLock.PublicCondition c = (PublicReentrantReadWriteLock.PublicCondition)lock.newCondition();
1387	<	Thread t1 = new Thread(new Runnable() {
1384	>	public void testGetWaitingThreads() throws InterruptedException {
1385	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1386	>	final Condition c = lock.writeLock().newCondition();
1387	>	Thread t1 = new Thread(new Runnable() {
1388		public void run() {
1389		try {
1390		lock.writeLock().lock();
1391	<	threadAssertTrue(c.getWaitingThreads().isEmpty());
1391	>	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1392		c.await();
1393		lock.writeLock().unlock();
1394		}
1395	<	catch(InterruptedException e) {
1395	>	catch (InterruptedException e) {
1396		threadUnexpectedException();
1397		}
1398		}
1399		});
1400
1401	<	Thread t2 = new Thread(new Runnable() {
1401	>	Thread t2 = new Thread(new Runnable() {
1402		public void run() {
1403		try {
1404		lock.writeLock().lock();
1405	<	threadAssertFalse(c.getWaitingThreads().isEmpty());
1405	>	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1406		c.await();
1407		lock.writeLock().unlock();
1408		}
1409	<	catch(InterruptedException e) {
1409	>	catch (InterruptedException e) {
1410		threadUnexpectedException();
1411		}
1412		}
1413		});
1414
1415	<	try {
1416	<	lock.writeLock().lock();
1417	<	assertTrue(c.getWaitingThreads().isEmpty());
1418	<	lock.writeLock().unlock();
1419	<	t1.start();
1420	<	Thread.sleep(SHORT_DELAY_MS);
1421	<	t2.start();
1422	<	Thread.sleep(SHORT_DELAY_MS);
1423	<	lock.writeLock().lock();
1424	<	assertTrue(c.hasWaiters());
1425	<	assertTrue(c.getWaitingThreads().contains(t1));
1426	<	assertTrue(c.getWaitingThreads().contains(t2));
1427	<	c.signalAll();
1428	<	lock.writeLock().unlock();
1429	<	Thread.sleep(SHORT_DELAY_MS);
1430	<	lock.writeLock().lock();
1431	<	assertFalse(c.hasWaiters());
1432	<	assertTrue(c.getWaitingThreads().isEmpty());
1433	<	lock.writeLock().unlock();
1434	<	t1.join(SHORT_DELAY_MS);
1435	<	t2.join(SHORT_DELAY_MS);
1436	<	assertFalse(t1.isAlive());
1437	<	assertFalse(t2.isAlive());
1438	<	}
1439	<	catch (Exception ex) {
1440	<	unexpectedException();
1441	<	}
1415	>	lock.writeLock().lock();
1416	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1417	>	lock.writeLock().unlock();
1418	>	t1.start();
1419	>	Thread.sleep(SHORT_DELAY_MS);
1420	>	t2.start();
1421	>	Thread.sleep(SHORT_DELAY_MS);
1422	>	lock.writeLock().lock();
1423	>	assertTrue(lock.hasWaiters(c));
1424	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
1425	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
1426	>	c.signalAll();
1427	>	lock.writeLock().unlock();
1428	>	Thread.sleep(SHORT_DELAY_MS);
1429	>	lock.writeLock().lock();
1430	>	assertFalse(lock.hasWaiters(c));
1431	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1432	>	lock.writeLock().unlock();
1433	>	t1.join(SHORT_DELAY_MS);
1434	>	t2.join(SHORT_DELAY_MS);
1435	>	assertFalse(t1.isAlive());
1436	>	assertFalse(t2.isAlive());
1437	>	}
1438	>
1439	>	/**
1440	>	* toString indicates current lock state
1441	>	*/
1442	>	public void testToString() {
1443	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1444	>	String us = lock.toString();
1445	>	assertTrue(us.indexOf("Write locks = 0") >= 0);
1446	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1447	>	lock.writeLock().lock();
1448	>	String ws = lock.toString();
1449	>	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1450	>	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1451	>	lock.writeLock().unlock();
1452	>	lock.readLock().lock();
1453	>	lock.readLock().lock();
1454	>	String rs = lock.toString();
1455	>	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1456	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1457	>	}
1458	>
1459	>	/**
1460	>	* readLock.toString indicates current lock state
1461	>	*/
1462	>	public void testReadLockToString() {
1463	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1464	>	String us = lock.readLock().toString();
1465	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1466	>	lock.readLock().lock();
1467	>	lock.readLock().lock();
1468	>	String rs = lock.readLock().toString();
1469	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1470	>	}
1471	>
1472	>	/**
1473	>	* writeLock.toString indicates current lock state
1474	>	*/
1475	>	public void testWriteLockToString() {
1476	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1477	>	String us = lock.writeLock().toString();
1478	>	assertTrue(us.indexOf("Unlocked") >= 0);
1479	>	lock.writeLock().lock();
1480	>	String ls = lock.writeLock().toString();
1481	>	assertTrue(ls.indexOf("Locked") >= 0);
1482		}
1483
1484		}

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