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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.2 by dl, Sun Sep 7 20:39:11 2003 UTC vs.
Revision 1.26 by dl, Fri Feb 24 00:03:16 2006 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
2	>	* Written by Doug Lea with assistance from members of JCP JSR-166
3	>	* Expert Group and released to the public domain, as explained at
4	>	* http://creativecommons.org/licenses/publicdomain
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9		import junit.framework.*;
10		import java.util.concurrent.locks.*;
11		import java.util.concurrent.*;
12		import java.io.*;
13	+	import java.util.*;
14
15	<	public class ReentrantReadWriteLockTest extends TestCase {
14	<	static int HOLD_COUNT_TEST_LIMIT = 20;
15	<
15	>	public class ReentrantReadWriteLockTest extends JSR166TestCase {
16		public static void main(String[] args) {
17		junit.textui.TestRunner.run (suite());
18		}
19	–
19		public static Test suite() {
20		return new TestSuite(ReentrantReadWriteLockTest.class);
21		}
22
23	+	/**
24	+	* A runnable calling lockInterruptibly
25	+	*/
26	+	class InterruptibleLockRunnable implements Runnable {
27	+	final ReentrantReadWriteLock lock;
28	+	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
29	+	public void run() {
30	+	try {
31	+	lock.writeLock().lockInterruptibly();
32	+	} catch(InterruptedException success){}
33	+	}
34	+	}
35
36	<	private static long SHORT_DELAY_MS = 100;
37	<	private static long MEDIUM_DELAY_MS = 1000;
38	<	private static long LONG_DELAY_MS = 10000;
39	<
29	<	/*
30	<	* Unlocks an unlocked lock, throws Illegal Monitor State
31	<	*
36	>
37	>	/**
38	>	* A runnable calling lockInterruptibly that expects to be
39	>	* interrupted
40		*/
41	<
42	<	public void testIllegalMonitorStateException(){
41	>	class InterruptedLockRunnable implements Runnable {
42	>	final ReentrantReadWriteLock lock;
43	>	InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
44	>	public void run() {
45	>	try {
46	>	lock.writeLock().lockInterruptibly();
47	>	threadShouldThrow();
48	>	} catch(InterruptedException success){}
49	>	}
50	>	}
51	>
52	>	/**
53	>	* Subclass to expose protected methods
54	>	*/
55	>	static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
56	>	PublicReentrantReadWriteLock() { super(); }
57	>	public Collection<Thread> getQueuedThreads() {
58	>	return super.getQueuedThreads();
59	>	}
60	>	public Collection<Thread> getWaitingThreads(Condition c) {
61	>	return super.getWaitingThreads(c);
62	>	}
63	>	}
64	>
65	>	/**
66	>	* Constructor sets given fairness, and is in unlocked state
67	>	*/
68	>	public void testConstructor() {
69		ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
70	<	try{
71	<	rl.writeLock().unlock();
72	<	fail("Should of thown Illegal Monitor State Exception");
70	>	assertFalse(rl.isFair());
71	>	assertFalse(rl.isWriteLocked());
72	>	assertEquals(0, rl.getReadLockCount());
73	>	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
74	>	assertTrue(r2.isFair());
75	>	assertFalse(r2.isWriteLocked());
76	>	assertEquals(0, r2.getReadLockCount());
77	>	}
78
79	<	}catch(IllegalMonitorStateException success){}
79	>	/**
80	>	* write-locking and read-locking an unlocked lock succeed
81	>	*/
82	>	public void testLock() {
83	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
84	>	rl.writeLock().lock();
85	>	assertTrue(rl.isWriteLocked());
86	>	assertTrue(rl.isWriteLockedByCurrentThread());
87	>	assertTrue(rl.writeLock().isHeldByCurrentThread());
88	>	assertEquals(0, rl.getReadLockCount());
89	>	rl.writeLock().unlock();
90	>	assertFalse(rl.isWriteLocked());
91	>	assertFalse(rl.isWriteLockedByCurrentThread());
92	>	assertFalse(rl.writeLock().isHeldByCurrentThread());
93	>	assertEquals(0, rl.getReadLockCount());
94	>	rl.readLock().lock();
95	>	assertFalse(rl.isWriteLocked());
96	>	assertFalse(rl.isWriteLockedByCurrentThread());
97	>	assertEquals(1, rl.getReadLockCount());
98	>	rl.readLock().unlock();
99	>	assertFalse(rl.isWriteLocked());
100	>	assertFalse(rl.isWriteLockedByCurrentThread());
101	>	assertEquals(0, rl.getReadLockCount());
102	>	}
103	>
104	>
105	>	/**
106	>	* locking an unlocked fair lock succeeds
107	>	*/
108	>	public void testFairLock() {
109	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
110	>	rl.writeLock().lock();
111	>	assertTrue(rl.isWriteLocked());
112	>	assertTrue(rl.isWriteLockedByCurrentThread());
113	>	assertTrue(rl.writeLock().isHeldByCurrentThread());
114	>	assertEquals(0, rl.getReadLockCount());
115	>	rl.writeLock().unlock();
116	>	assertFalse(rl.isWriteLocked());
117	>	assertFalse(rl.isWriteLockedByCurrentThread());
118	>	assertFalse(rl.writeLock().isHeldByCurrentThread());
119	>	assertEquals(0, rl.getReadLockCount());
120	>	rl.readLock().lock();
121	>	assertFalse(rl.isWriteLocked());
122	>	assertFalse(rl.isWriteLockedByCurrentThread());
123	>	assertEquals(1, rl.getReadLockCount());
124	>	rl.readLock().unlock();
125	>	assertFalse(rl.isWriteLocked());
126	>	assertFalse(rl.isWriteLockedByCurrentThread());
127	>	assertEquals(0, rl.getReadLockCount());
128	>	}
129	>
130	>	/**
131	>	* getWriteHoldCount returns number of recursive holds
132	>	*/
133	>	public void testGetWriteHoldCount() {
134	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
135	>	for(int i = 1; i <= SIZE; i++) {
136	>	lock.writeLock().lock();
137	>	assertEquals(i,lock.getWriteHoldCount());
138	>	}
139	>	for(int i = SIZE; i > 0; i--) {
140	>	lock.writeLock().unlock();
141	>	assertEquals(i-1,lock.getWriteHoldCount());
142	>	}
143		}
144
145	+	/**
146	+	* WriteLock.getHoldCount returns number of recursive holds
147	+	*/
148	+	public void testGetHoldCount() {
149	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
150	+	for(int i = 1; i <= SIZE; i++) {
151	+	lock.writeLock().lock();
152	+	assertEquals(i,lock.writeLock().getHoldCount());
153	+	}
154	+	for(int i = SIZE; i > 0; i--) {
155	+	lock.writeLock().unlock();
156	+	assertEquals(i-1,lock.writeLock().getHoldCount());
157	+	}
158	+	}
159	+
160	+	/**
161	+	* getReadHoldCount returns number of recursive holds
162	+	*/
163	+	public void testGetReadHoldCount() {
164	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
165	+	for(int i = 1; i <= SIZE; i++) {
166	+	lock.readLock().lock();
167	+	assertEquals(i,lock.getReadHoldCount());
168	+	}
169	+	for(int i = SIZE; i > 0; i--) {
170	+	lock.readLock().unlock();
171	+	assertEquals(i-1,lock.getReadHoldCount());
172	+	}
173	+	}
174	+
175	+
176	+	/**
177	+	* write-unlocking an unlocked lock throws IllegalMonitorStateException
178	+	*/
179	+	public void testUnlock_IllegalMonitorStateException() {
180	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
181	+	try {
182	+	rl.writeLock().unlock();
183	+	shouldThrow();
184	+	} catch(IllegalMonitorStateException success){}
185	+	}
186
187
188	<	public void testInterruptedException(){
188	>	/**
189	>	* write-lockInterruptibly is interruptible
190	>	*/
191	>	public void testWriteLockInterruptibly_Interrupted() {
192		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
47	–	lock.writeLock().lock();
193		Thread t = new Thread(new Runnable() {
194	<	public void run(){
195	<	try{
194	>	public void run() {
195	>	try {
196	>	lock.writeLock().lockInterruptibly();
197	>	lock.writeLock().unlock();
198		lock.writeLock().lockInterruptibly();
199	<	fail("should throw");
200	<	}catch(InterruptedException success){}
199	>	lock.writeLock().unlock();
200	>	} catch(InterruptedException success){}
201		}
202		});
203		try {
204	+	lock.writeLock().lock();
205		t.start();
206	+	Thread.sleep(SHORT_DELAY_MS);
207		t.interrupt();
208		lock.writeLock().unlock();
209		t.join();
210		} catch(Exception e){
211	<	fail("unexpected exception");
211	>	unexpectedException();
212		}
213		}
214
215	<	public void testInterruptedException2(){
215	>	/**
216	>	* timed write-tryLock is interruptible
217	>	*/
218	>	public void testWriteTryLock_Interrupted() {
219		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
220		lock.writeLock().lock();
221		Thread t = new Thread(new Runnable() {
222	<	public void run(){
223	<	try{
222	>	public void run() {
223	>	try {
224		lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
225	<	fail("should throw");
74	<	}catch(InterruptedException success){}
225	>	} catch(InterruptedException success){}
226		}
227		});
228		try {
#	Line 80 | Line 231 | public class ReentrantReadWriteLockTest
231		lock.writeLock().unlock();
232		t.join();
233		} catch(Exception e){
234	<	fail("unexpected exception");
234	>	unexpectedException();
235		}
236		}
237
238	<	public void testInterruptedException3(){
238	>	/**
239	>	* read-lockInterruptibly is interruptible
240	>	*/
241	>	public void testReadLockInterruptibly_Interrupted() {
242		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
243		lock.writeLock().lock();
244		Thread t = new Thread(new Runnable() {
245	<	public void run(){
246	<	try{
245	>	public void run() {
246	>	try {
247		lock.readLock().lockInterruptibly();
248	<	fail("should throw");
95	<	}catch(InterruptedException success){}
248	>	} catch(InterruptedException success){}
249		}
250		});
251		try {
252		t.start();
253	+	Thread.sleep(SHORT_DELAY_MS);
254		t.interrupt();
255		lock.writeLock().unlock();
256		t.join();
257		} catch(Exception e){
258	<	fail("unexpected exception");
258	>	unexpectedException();
259		}
260		}
261
262	<	public void testInterruptedException4(){
262	>	/**
263	>	* timed read-tryLock is interruptible
264	>	*/
265	>	public void testReadTryLock_Interrupted() {
266		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
267		lock.writeLock().lock();
268		Thread t = new Thread(new Runnable() {
269	<	public void run(){
270	<	try{
269	>	public void run() {
270	>	try {
271		lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
272	<	fail("should throw");
273	<	}catch(InterruptedException success){}
272	>	threadShouldThrow();
273	>	} catch(InterruptedException success){}
274		}
275		});
276		try {
#	Line 121 | Line 278 | public class ReentrantReadWriteLockTest
278		t.interrupt();
279		t.join();
280		} catch(Exception e){
281	<	fail("unexpected exception");
281	>	unexpectedException();
282		}
283		}
284
285
286	<	public void testTryLockWhenLocked() {
286	>	/**
287	>	* write-tryLock fails if locked
288	>	*/
289	>	public void testWriteTryLockWhenLocked() {
290		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
291		lock.writeLock().lock();
292		Thread t = new Thread(new Runnable() {
293	<	public void run(){
294	<	assertFalse(lock.writeLock().tryLock());
293	>	public void run() {
294	>	threadAssertFalse(lock.writeLock().tryLock());
295		}
296		});
297		try {
#	Line 139 | Line 299 | public class ReentrantReadWriteLockTest
299		t.join();
300		lock.writeLock().unlock();
301		} catch(Exception e){
302	<	fail("unexpected exception");
302	>	unexpectedException();
303		}
304		}
305
306	<	public void testTryLockWhenLocked2() {
306	>	/**
307	>	* read-tryLock fails if locked
308	>	*/
309	>	public void testReadTryLockWhenLocked() {
310		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
311		lock.writeLock().lock();
312		Thread t = new Thread(new Runnable() {
313	<	public void run(){
314	<	assertFalse(lock.readLock().tryLock());
313	>	public void run() {
314	>	threadAssertFalse(lock.readLock().tryLock());
315		}
316		});
317		try {
#	Line 156 | Line 319 | public class ReentrantReadWriteLockTest
319		t.join();
320		lock.writeLock().unlock();
321		} catch(Exception e){
322	<	fail("unexpected exception");
322	>	unexpectedException();
323		}
324		}
325
326	+	/**
327	+	* Multiple threads can hold a read lock when not write-locked
328	+	*/
329		public void testMultipleReadLocks() {
330		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
331		lock.readLock().lock();
332		Thread t = new Thread(new Runnable() {
333	<	public void run(){
334	<	assertTrue(lock.readLock().tryLock());
333	>	public void run() {
334	>	threadAssertTrue(lock.readLock().tryLock());
335		lock.readLock().unlock();
336		}
337		});
#	Line 174 | Line 340 | public class ReentrantReadWriteLockTest
340		t.join();
341		lock.readLock().unlock();
342		} catch(Exception e){
343	<	fail("unexpected exception");
343	>	unexpectedException();
344		}
345		}
346
347	+	/**
348	+	* A writelock succeeds after reading threads unlock
349	+	*/
350		public void testWriteAfterMultipleReadLocks() {
351		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
352		lock.readLock().lock();
353		Thread t1 = new Thread(new Runnable() {
354	<	public void run(){
354	>	public void run() {
355		lock.readLock().lock();
356		lock.readLock().unlock();
357		}
358		});
359		Thread t2 = new Thread(new Runnable() {
360	<	public void run(){
360	>	public void run() {
361		lock.writeLock().lock();
362		lock.writeLock().unlock();
363		}
#	Line 205 | Line 374 | public class ReentrantReadWriteLockTest
374		assertTrue(!t2.isAlive());
375
376		} catch(Exception e){
377	<	fail("unexpected exception");
377	>	unexpectedException();
378		}
379		}
380
381	+	/**
382	+	* Readlocks succeed after a writing thread unlocks
383	+	*/
384		public void testReadAfterWriteLock() {
385		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
386		lock.writeLock().lock();
387		Thread t1 = new Thread(new Runnable() {
388	<	public void run(){
388	>	public void run() {
389		lock.readLock().lock();
390		lock.readLock().unlock();
391		}
392		});
393		Thread t2 = new Thread(new Runnable() {
394	<	public void run(){
394	>	public void run() {
395		lock.readLock().lock();
396		lock.readLock().unlock();
397		}
#	Line 236 | Line 408 | public class ReentrantReadWriteLockTest
408		assertTrue(!t2.isAlive());
409
410		} catch(Exception e){
411	<	fail("unexpected exception");
411	>	unexpectedException();
412		}
413		}
414
415	+	/**
416	+	* Read trylock succeeds if write locked by current thread
417	+	*/
418	+	public void testReadHoldingWriteLock() {
419	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
420	+	lock.writeLock().lock();
421	+	assertTrue(lock.readLock().tryLock());
422	+	lock.readLock().unlock();
423	+	lock.writeLock().unlock();
424	+	}
425
426	+	/**
427	+	* Read lock succeeds if write locked by current thread even if
428	+	* other threads are waiting for readlock
429	+	*/
430	+	public void testReadHoldingWriteLock2() {
431	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
432	+	lock.writeLock().lock();
433	+	Thread t1 = new Thread(new Runnable() {
434	+	public void run() {
435	+	lock.readLock().lock();
436	+	lock.readLock().unlock();
437	+	}
438	+	});
439	+	Thread t2 = new Thread(new Runnable() {
440	+	public void run() {
441	+	lock.readLock().lock();
442	+	lock.readLock().unlock();
443	+	}
444	+	});
445	+
446	+	try {
447	+	t1.start();
448	+	t2.start();
449	+	lock.readLock().lock();
450	+	lock.readLock().unlock();
451	+	Thread.sleep(SHORT_DELAY_MS);
452	+	lock.readLock().lock();
453	+	lock.readLock().unlock();
454	+	lock.writeLock().unlock();
455	+	t1.join(MEDIUM_DELAY_MS);
456	+	t2.join(MEDIUM_DELAY_MS);
457	+	assertTrue(!t1.isAlive());
458	+	assertTrue(!t2.isAlive());
459	+
460	+	} catch(Exception e){
461	+	unexpectedException();
462	+	}
463	+	}
464	+
465	+	/**
466	+	*  Read lock succeeds if write locked by current thread even if
467	+	* other threads are waiting for writelock
468	+	*/
469	+	public void testReadHoldingWriteLock3() {
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	+	try {
486	+	t1.start();
487	+	t2.start();
488	+	lock.readLock().lock();
489	+	lock.readLock().unlock();
490	+	Thread.sleep(SHORT_DELAY_MS);
491	+	lock.readLock().lock();
492	+	lock.readLock().unlock();
493	+	lock.writeLock().unlock();
494	+	t1.join(MEDIUM_DELAY_MS);
495	+	t2.join(MEDIUM_DELAY_MS);
496	+	assertTrue(!t1.isAlive());
497	+	assertTrue(!t2.isAlive());
498	+
499	+	} catch(Exception e){
500	+	unexpectedException();
501	+	}
502	+	}
503	+
504	+
505	+	/**
506	+	*  Write lock succeeds if write locked by current thread even if
507	+	* other threads are waiting for writelock
508	+	*/
509	+	public void testWriteHoldingWriteLock4() {
510	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
511	+	lock.writeLock().lock();
512	+	Thread t1 = new Thread(new Runnable() {
513	+	public void run() {
514	+	lock.writeLock().lock();
515	+	lock.writeLock().unlock();
516	+	}
517	+	});
518	+	Thread t2 = new Thread(new Runnable() {
519	+	public void run() {
520	+	lock.writeLock().lock();
521	+	lock.writeLock().unlock();
522	+	}
523	+	});
524	+
525	+	try {
526	+	t1.start();
527	+	t2.start();
528	+	lock.writeLock().lock();
529	+	lock.writeLock().unlock();
530	+	Thread.sleep(SHORT_DELAY_MS);
531	+	lock.writeLock().lock();
532	+	lock.writeLock().unlock();
533	+	lock.writeLock().unlock();
534	+	t1.join(MEDIUM_DELAY_MS);
535	+	t2.join(MEDIUM_DELAY_MS);
536	+	assertTrue(!t1.isAlive());
537	+	assertTrue(!t2.isAlive());
538	+
539	+	} catch(Exception e){
540	+	unexpectedException();
541	+	}
542	+	}
543	+
544	+
545	+	/**
546	+	* Fair Read trylock succeeds if write locked by current thread
547	+	*/
548	+	public void testReadHoldingWriteLockFair() {
549	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
550	+	lock.writeLock().lock();
551	+	assertTrue(lock.readLock().tryLock());
552	+	lock.readLock().unlock();
553	+	lock.writeLock().unlock();
554	+	}
555	+
556	+	/**
557	+	* Fair Read lock succeeds if write locked by current thread even if
558	+	* other threads are waiting for readlock
559	+	*/
560	+	public void testReadHoldingWriteLockFair2() {
561	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
562	+	lock.writeLock().lock();
563	+	Thread t1 = new Thread(new Runnable() {
564	+	public void run() {
565	+	lock.readLock().lock();
566	+	lock.readLock().unlock();
567	+	}
568	+	});
569	+	Thread t2 = new Thread(new Runnable() {
570	+	public void run() {
571	+	lock.readLock().lock();
572	+	lock.readLock().unlock();
573	+	}
574	+	});
575	+
576	+	try {
577	+	t1.start();
578	+	t2.start();
579	+	lock.readLock().lock();
580	+	lock.readLock().unlock();
581	+	Thread.sleep(SHORT_DELAY_MS);
582	+	lock.readLock().lock();
583	+	lock.readLock().unlock();
584	+	lock.writeLock().unlock();
585	+	t1.join(MEDIUM_DELAY_MS);
586	+	t2.join(MEDIUM_DELAY_MS);
587	+	assertTrue(!t1.isAlive());
588	+	assertTrue(!t2.isAlive());
589	+
590	+	} catch(Exception e){
591	+	unexpectedException();
592	+	}
593	+	}
594	+
595	+
596	+	/**
597	+	* Fair Read lock succeeds if write locked by current thread even if
598	+	* other threads are waiting for writelock
599	+	*/
600	+	public void testReadHoldingWriteLockFair3() {
601	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
602	+	lock.writeLock().lock();
603	+	Thread t1 = new Thread(new Runnable() {
604	+	public void run() {
605	+	lock.writeLock().lock();
606	+	lock.writeLock().unlock();
607	+	}
608	+	});
609	+	Thread t2 = new Thread(new Runnable() {
610	+	public void run() {
611	+	lock.writeLock().lock();
612	+	lock.writeLock().unlock();
613	+	}
614	+	});
615	+
616	+	try {
617	+	t1.start();
618	+	t2.start();
619	+	lock.readLock().lock();
620	+	lock.readLock().unlock();
621	+	Thread.sleep(SHORT_DELAY_MS);
622	+	lock.readLock().lock();
623	+	lock.readLock().unlock();
624	+	lock.writeLock().unlock();
625	+	t1.join(MEDIUM_DELAY_MS);
626	+	t2.join(MEDIUM_DELAY_MS);
627	+	assertTrue(!t1.isAlive());
628	+	assertTrue(!t2.isAlive());
629	+
630	+	} catch(Exception e){
631	+	unexpectedException();
632	+	}
633	+	}
634	+
635	+
636	+	/**
637	+	* Fair Write lock succeeds if write locked by current thread even if
638	+	* other threads are waiting for writelock
639	+	*/
640	+	public void testWriteHoldingWriteLockFair4() {
641	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
642	+	lock.writeLock().lock();
643	+	Thread t1 = new Thread(new Runnable() {
644	+	public void run() {
645	+	lock.writeLock().lock();
646	+	lock.writeLock().unlock();
647	+	}
648	+	});
649	+	Thread t2 = new Thread(new Runnable() {
650	+	public void run() {
651	+	lock.writeLock().lock();
652	+	lock.writeLock().unlock();
653	+	}
654	+	});
655	+
656	+	try {
657	+	t1.start();
658	+	t2.start();
659	+	Thread.sleep(SHORT_DELAY_MS);
660	+	assertTrue(lock.isWriteLockedByCurrentThread());
661	+	assertTrue(lock.getWriteHoldCount() == 1);
662	+	lock.writeLock().lock();
663	+	assertTrue(lock.getWriteHoldCount() == 2);
664	+	lock.writeLock().unlock();
665	+	lock.writeLock().lock();
666	+	lock.writeLock().unlock();
667	+	lock.writeLock().unlock();
668	+	t1.join(MEDIUM_DELAY_MS);
669	+	t2.join(MEDIUM_DELAY_MS);
670	+	assertTrue(!t1.isAlive());
671	+	assertTrue(!t2.isAlive());
672	+
673	+	} catch(Exception e){
674	+	unexpectedException();
675	+	}
676	+	}
677	+
678	+
679	+	/**
680	+	* Read tryLock succeeds if readlocked but not writelocked
681	+	*/
682		public void testTryLockWhenReadLocked() {
683		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
684		lock.readLock().lock();
685		Thread t = new Thread(new Runnable() {
686	<	public void run(){
687	<	assertTrue(lock.readLock().tryLock());
686	>	public void run() {
687	>	threadAssertTrue(lock.readLock().tryLock());
688		lock.readLock().unlock();
689		}
690		});
#	Line 255 | Line 693 | public class ReentrantReadWriteLockTest
693		t.join();
694		lock.readLock().unlock();
695		} catch(Exception e){
696	<	fail("unexpected exception");
696	>	unexpectedException();
697		}
698		}
699
700
701
702	+	/**
703	+	* write tryLock fails when readlocked
704	+	*/
705		public void testWriteTryLockWhenReadLocked() {
706		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
707		lock.readLock().lock();
708		Thread t = new Thread(new Runnable() {
709	<	public void run(){
710	<	assertFalse(lock.writeLock().tryLock());
709	>	public void run() {
710	>	threadAssertFalse(lock.writeLock().tryLock());
711	>	}
712	>	});
713	>	try {
714	>	t.start();
715	>	t.join();
716	>	lock.readLock().unlock();
717	>	} catch(Exception e){
718	>	unexpectedException();
719	>	}
720	>	}
721	>
722	>
723	>	/**
724	>	* Fair Read tryLock succeeds if readlocked but not writelocked
725	>	*/
726	>	public void testTryLockWhenReadLockedFair() {
727	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
728	>	lock.readLock().lock();
729	>	Thread t = new Thread(new Runnable() {
730	>	public void run() {
731	>	threadAssertTrue(lock.readLock().tryLock());
732	>	lock.readLock().unlock();
733		}
734		});
735		try {
#	Line 274 | Line 737 | public class ReentrantReadWriteLockTest
737		t.join();
738		lock.readLock().unlock();
739		} catch(Exception e){
740	<	fail("unexpected exception");
740	>	unexpectedException();
741		}
742		}
743
744
745
746	<	public void testTryLock_Timeout(){
746	>	/**
747	>	* Fair write tryLock fails when readlocked
748	>	*/
749	>	public void testWriteTryLockWhenReadLockedFair() {
750	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
751	>	lock.readLock().lock();
752	>	Thread t = new Thread(new Runnable() {
753	>	public void run() {
754	>	threadAssertFalse(lock.writeLock().tryLock());
755	>	}
756	>	});
757	>	try {
758	>	t.start();
759	>	t.join();
760	>	lock.readLock().unlock();
761	>	} catch(Exception e){
762	>	unexpectedException();
763	>	}
764	>	}
765	>
766	>
767	>
768	>	/**
769	>	* write timed tryLock times out if locked
770	>	*/
771	>	public void testWriteTryLock_Timeout() {
772		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
773		lock.writeLock().lock();
774		Thread t = new Thread(new Runnable() {
775	<	public void run(){
775	>	public void run() {
776		try {
777	<	assertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
777	>	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
778		} catch (Exception ex) {
779	<	fail("unexpected exception");
779	>	threadUnexpectedException();
780		}
781		}
782		});
#	Line 297 | Line 785 | public class ReentrantReadWriteLockTest
785		t.join();
786		lock.writeLock().unlock();
787		} catch(Exception e){
788	<	fail("unexpected exception");
788	>	unexpectedException();
789		}
790		}
791
792	<	public void testTryLock_Timeout2(){
792	>	/**
793	>	* read timed tryLock times out if write-locked
794	>	*/
795	>	public void testReadTryLock_Timeout() {
796		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
797		lock.writeLock().lock();
798		Thread t = new Thread(new Runnable() {
799	<	public void run(){
799	>	public void run() {
800		try {
801	<	assertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
801	>	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
802		} catch (Exception ex) {
803	<	fail("unexpected exception");
803	>	threadUnexpectedException();
804		}
805		}
806		});
#	Line 318 | Line 809 | public class ReentrantReadWriteLockTest
809		t.join();
810		lock.writeLock().unlock();
811		} catch(Exception e){
812	<	fail("unexpected exception");
812	>	unexpectedException();
813		}
814		}
815
816
817	<	public void testLockInterruptibly() {
817	>	/**
818	>	* write lockInterruptibly succeeds if lock free else is interruptible
819	>	*/
820	>	public void testWriteLockInterruptibly() {
821		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
822		try {
823		lock.writeLock().lockInterruptibly();
824		} catch(Exception e) {
825	<	fail("unexpected exception");
825	>	unexpectedException();
826		}
827		Thread t = new Thread(new Runnable() {
828		public void run() {
829		try {
830		lock.writeLock().lockInterruptibly();
831	<	fail("should throw");
831	>	threadShouldThrow();
832		}
833		catch(InterruptedException success) {
834		}
#	Line 342 | Line 836 | public class ReentrantReadWriteLockTest
836		});
837		try {
838		t.start();
839	+	Thread.sleep(SHORT_DELAY_MS);
840		t.interrupt();
841		t.join();
842		lock.writeLock().unlock();
843		} catch(Exception e){
844	<	fail("unexpected exception");
844	>	unexpectedException();
845		}
846		}
847
848	<	public void testLockInterruptibly2() {
848	>	/**
849	>	*  read lockInterruptibly succeeds if lock free else is interruptible
850	>	*/
851	>	public void testReadLockInterruptibly() {
852		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
853		try {
854		lock.writeLock().lockInterruptibly();
855		} catch(Exception e) {
856	<	fail("unexpected exception");
856	>	unexpectedException();
857		}
858		Thread t = new Thread(new Runnable() {
859		public void run() {
860		try {
861		lock.readLock().lockInterruptibly();
862	<	fail("should throw");
862	>	threadShouldThrow();
863		}
864		catch(InterruptedException success) {
865		}
#	Line 369 | Line 867 | public class ReentrantReadWriteLockTest
867		});
868		try {
869		t.start();
870	+	Thread.sleep(SHORT_DELAY_MS);
871		t.interrupt();
872		t.join();
873		lock.writeLock().unlock();
874		} catch(Exception e){
875	<	fail("unexpected exception");
875	>	unexpectedException();
876		}
877		}
878
879	+	/**
880	+	* Calling await without holding lock throws IllegalMonitorStateException
881	+	*/
882		public void testAwait_IllegalMonitor() {
883		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
884		final Condition c = lock.writeLock().newCondition();
885		try {
886		c.await();
887	<	fail("should throw");
887	>	shouldThrow();
888		}
889		catch (IllegalMonitorStateException success) {
890		}
891		catch (Exception ex) {
892	<	fail("should throw IMSE");
892	>	shouldThrow();
893		}
894		}
895
896	+	/**
897	+	* Calling signal without holding lock throws IllegalMonitorStateException
898	+	*/
899		public void testSignal_IllegalMonitor() {
900		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
901		final Condition c = lock.writeLock().newCondition();
902		try {
903		c.signal();
904	<	fail("should throw");
904	>	shouldThrow();
905		}
906		catch (IllegalMonitorStateException success) {
907		}
908		catch (Exception ex) {
909	<	fail("should throw IMSE");
909	>	unexpectedException();
910		}
911		}
912
913	+	/**
914	+	* awaitNanos without a signal times out
915	+	*/
916		public void testAwaitNanos_Timeout() {
917		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
918		final Condition c = lock.writeLock().newCondition();
#	Line 415 | Line 923 | public class ReentrantReadWriteLockTest
923		lock.writeLock().unlock();
924		}
925		catch (Exception ex) {
926	<	fail("unexpected exception");
926	>	unexpectedException();
927		}
928		}
929
930	+
931	+	/**
932	+	*  timed await without a signal times out
933	+	*/
934		public void testAwait_Timeout() {
935		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
936		final Condition c = lock.writeLock().newCondition();
937		try {
938		lock.writeLock().lock();
427	–	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
939		lock.writeLock().unlock();
940		}
941		catch (Exception ex) {
942	<	fail("unexpected exception");
942	>	unexpectedException();
943		}
944		}
945
946	+	/**
947	+	* awaitUntil without a signal times out
948	+	*/
949		public void testAwaitUntil_Timeout() {
950		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
951		final Condition c = lock.writeLock().newCondition();
952		try {
953		lock.writeLock().lock();
954		java.util.Date d = new java.util.Date();
441	–	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
955		lock.writeLock().unlock();
956		}
957		catch (Exception ex) {
958	<	fail("unexpected exception");
958	>	unexpectedException();
959		}
960		}
961
962	+	/**
963	+	* await returns when signalled
964	+	*/
965		public void testAwait() {
966		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
967		final Condition c = lock.writeLock().newCondition();
#	Line 457 | Line 973 | public class ReentrantReadWriteLockTest
973		lock.writeLock().unlock();
974		}
975		catch(InterruptedException e) {
976	<	fail("unexpected exception");
976	>	threadUnexpectedException();
977		}
978		}
979		});
#	Line 472 | Line 988 | public class ReentrantReadWriteLockTest
988		assertFalse(t.isAlive());
989		}
990		catch (Exception ex) {
991	<	fail("unexpected exception");
991	>	unexpectedException();
992		}
993		}
994
995	+	/** A helper class for uninterruptible wait tests */
996	+	class UninterruptableThread extends Thread {
997	+	private Lock lock;
998	+	private Condition c;
999	+
1000	+	public volatile boolean canAwake = false;
1001	+	public volatile boolean interrupted = false;
1002	+	public volatile boolean lockStarted = false;
1003	+
1004	+	public UninterruptableThread(Lock lock, Condition c) {
1005	+	this.lock = lock;
1006	+	this.c = c;
1007	+	}
1008	+
1009	+	public synchronized void run() {
1010	+	lock.lock();
1011	+	lockStarted = true;
1012	+
1013	+	while (!canAwake) {
1014	+	c.awaitUninterruptibly();
1015	+	}
1016	+
1017	+	interrupted = isInterrupted();
1018	+	lock.unlock();
1019	+	}
1020	+	}
1021	+
1022	+	/**
1023	+	* awaitUninterruptibly doesn't abort on interrupt
1024	+	*/
1025		public void testAwaitUninterruptibly() {
1026	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1026	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1027		final Condition c = lock.writeLock().newCondition();
1028	<	Thread t = new Thread(new Runnable() {
483	<	public void run() {
484	<	lock.writeLock().lock();
485	<	c.awaitUninterruptibly();
486	<	lock.writeLock().unlock();
487	<	}
488	<	});
1028	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
1029
1030		try {
1031	<	t.start();
1032	<	Thread.sleep(SHORT_DELAY_MS);
1033	<	t.interrupt();
1031	>	thread.start();
1032	>
1033	>	while (!thread.lockStarted) {
1034	>	Thread.sleep(100);
1035	>	}
1036	>
1037		lock.writeLock().lock();
1038	<	c.signal();
1039	<	lock.writeLock().unlock();
1040	<	t.join(SHORT_DELAY_MS);
1041	<	assertFalse(t.isAlive());
1042	<	}
1043	<	catch (Exception ex) {
1044	<	fail("unexpected exception");
1038	>	try {
1039	>	thread.interrupt();
1040	>	thread.canAwake = true;
1041	>	c.signal();
1042	>	} finally {
1043	>	lock.writeLock().unlock();
1044	>	}
1045	>
1046	>	thread.join();
1047	>	assertTrue(thread.interrupted);
1048	>	assertFalse(thread.isAlive());
1049	>	} catch (Exception ex) {
1050	>	unexpectedException();
1051		}
1052		}
1053
1054	+	/**
1055	+	* await is interruptible
1056	+	*/
1057		public void testAwait_Interrupt() {
1058		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1059		final Condition c = lock.writeLock().newCondition();
#	Line 511 | Line 1063 | public class ReentrantReadWriteLockTest
1063		lock.writeLock().lock();
1064		c.await();
1065		lock.writeLock().unlock();
1066	<	fail("should throw");
1066	>	threadShouldThrow();
1067		}
1068		catch(InterruptedException success) {
1069		}
#	Line 526 | Line 1078 | public class ReentrantReadWriteLockTest
1078		assertFalse(t.isAlive());
1079		}
1080		catch (Exception ex) {
1081	<	fail("unexpected exception");
1081	>	unexpectedException();
1082		}
1083		}
1084
1085	+	/**
1086	+	* awaitNanos is interruptible
1087	+	*/
1088		public void testAwaitNanos_Interrupt() {
1089		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1090		final Condition c = lock.writeLock().newCondition();
#	Line 539 | Line 1094 | public class ReentrantReadWriteLockTest
1094		lock.writeLock().lock();
1095		c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
1096		lock.writeLock().unlock();
1097	<	fail("should throw");
1097	>	threadShouldThrow();
1098		}
1099		catch(InterruptedException success) {
1100		}
#	Line 554 | Line 1109 | public class ReentrantReadWriteLockTest
1109		assertFalse(t.isAlive());
1110		}
1111		catch (Exception ex) {
1112	<	fail("unexpected exception");
1112	>	unexpectedException();
1113		}
1114		}
1115
1116	+	/**
1117	+	* awaitUntil is interruptible
1118	+	*/
1119		public void testAwaitUntil_Interrupt() {
1120		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1121		final Condition c = lock.writeLock().newCondition();
#	Line 568 | Line 1126 | public class ReentrantReadWriteLockTest
1126		java.util.Date d = new java.util.Date();
1127		c.awaitUntil(new java.util.Date(d.getTime() + 10000));
1128		lock.writeLock().unlock();
1129	<	fail("should throw");
1129	>	threadShouldThrow();
1130		}
1131		catch(InterruptedException success) {
1132		}
#	Line 583 | Line 1141 | public class ReentrantReadWriteLockTest
1141		assertFalse(t.isAlive());
1142		}
1143		catch (Exception ex) {
1144	<	fail("unexpected exception");
1144	>	unexpectedException();
1145		}
1146		}
1147
1148	+	/**
1149	+	* signalAll wakes up all threads
1150	+	*/
1151		public void testSignalAll() {
1152		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1153		final Condition c = lock.writeLock().newCondition();
#	Line 598 | Line 1159 | public class ReentrantReadWriteLockTest
1159		lock.writeLock().unlock();
1160		}
1161		catch(InterruptedException e) {
1162	<	fail("unexpected exception");
1162	>	threadUnexpectedException();
1163		}
1164		}
1165		});
#	Line 611 | Line 1172 | public class ReentrantReadWriteLockTest
1172		lock.writeLock().unlock();
1173		}
1174		catch(InterruptedException e) {
1175	<	fail("unexpected exception");
1175	>	threadUnexpectedException();
1176		}
1177		}
1178		});
#	Line 629 | Line 1190 | public class ReentrantReadWriteLockTest
1190		assertFalse(t2.isAlive());
1191		}
1192		catch (Exception ex) {
1193	<	fail("unexpected exception");
1193	>	unexpectedException();
1194		}
1195		}
1196
1197	+	/**
1198	+	* A serialized lock deserializes as unlocked
1199	+	*/
1200		public void testSerialization() {
1201		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
1202		l.readLock().lock();
#	Line 651 | Line 1215 | public class ReentrantReadWriteLockTest
1215		r.readLock().unlock();
1216		} catch(Exception e){
1217		e.printStackTrace();
1218	<	fail("unexpected exception");
1218	>	unexpectedException();
1219	>	}
1220	>	}
1221	>
1222	>	/**
1223	>	* hasQueuedThreads reports whether there are waiting threads
1224	>	*/
1225	>	public void testhasQueuedThreads() {
1226	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1227	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1228	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1229	>	try {
1230	>	assertFalse(lock.hasQueuedThreads());
1231	>	lock.writeLock().lock();
1232	>	t1.start();
1233	>	Thread.sleep(SHORT_DELAY_MS);
1234	>	assertTrue(lock.hasQueuedThreads());
1235	>	t2.start();
1236	>	Thread.sleep(SHORT_DELAY_MS);
1237	>	assertTrue(lock.hasQueuedThreads());
1238	>	t1.interrupt();
1239	>	Thread.sleep(SHORT_DELAY_MS);
1240	>	assertTrue(lock.hasQueuedThreads());
1241	>	lock.writeLock().unlock();
1242	>	Thread.sleep(SHORT_DELAY_MS);
1243	>	assertFalse(lock.hasQueuedThreads());
1244	>	t1.join();
1245	>	t2.join();
1246	>	} catch(Exception e){
1247	>	unexpectedException();
1248	>	}
1249	>	}
1250	>
1251	>	/**
1252	>	* hasQueuedThread(null) throws NPE
1253	>	*/
1254	>	public void testHasQueuedThreadNPE() {
1255	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1256	>	try {
1257	>	sync.hasQueuedThread(null);
1258	>	shouldThrow();
1259	>	} catch (NullPointerException success) {
1260	>	}
1261	>	}
1262	>
1263	>	/**
1264	>	* hasQueuedThread reports whether a thread is queued.
1265	>	*/
1266	>	public void testHasQueuedThread() {
1267	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1268	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1269	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1270	>	try {
1271	>	assertFalse(sync.hasQueuedThread(t1));
1272	>	assertFalse(sync.hasQueuedThread(t2));
1273	>	sync.writeLock().lock();
1274	>	t1.start();
1275	>	Thread.sleep(SHORT_DELAY_MS);
1276	>	assertTrue(sync.hasQueuedThread(t1));
1277	>	t2.start();
1278	>	Thread.sleep(SHORT_DELAY_MS);
1279	>	assertTrue(sync.hasQueuedThread(t1));
1280	>	assertTrue(sync.hasQueuedThread(t2));
1281	>	t1.interrupt();
1282	>	Thread.sleep(SHORT_DELAY_MS);
1283	>	assertFalse(sync.hasQueuedThread(t1));
1284	>	assertTrue(sync.hasQueuedThread(t2));
1285	>	sync.writeLock().unlock();
1286	>	Thread.sleep(SHORT_DELAY_MS);
1287	>	assertFalse(sync.hasQueuedThread(t1));
1288	>	Thread.sleep(SHORT_DELAY_MS);
1289	>	assertFalse(sync.hasQueuedThread(t2));
1290	>	t1.join();
1291	>	t2.join();
1292	>	} catch(Exception e){
1293	>	unexpectedException();
1294	>	}
1295	>	}
1296	>
1297	>
1298	>	/**
1299	>	* getQueueLength reports number of waiting threads
1300	>	*/
1301	>	public void testGetQueueLength() {
1302	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1303	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1304	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1305	>	try {
1306	>	assertEquals(0, lock.getQueueLength());
1307	>	lock.writeLock().lock();
1308	>	t1.start();
1309	>	Thread.sleep(SHORT_DELAY_MS);
1310	>	assertEquals(1, lock.getQueueLength());
1311	>	t2.start();
1312	>	Thread.sleep(SHORT_DELAY_MS);
1313	>	assertEquals(2, lock.getQueueLength());
1314	>	t1.interrupt();
1315	>	Thread.sleep(SHORT_DELAY_MS);
1316	>	assertEquals(1, lock.getQueueLength());
1317	>	lock.writeLock().unlock();
1318	>	Thread.sleep(SHORT_DELAY_MS);
1319	>	assertEquals(0, lock.getQueueLength());
1320	>	t1.join();
1321	>	t2.join();
1322	>	} catch(Exception e){
1323	>	unexpectedException();
1324	>	}
1325	>	}
1326	>
1327	>	/**
1328	>	* getQueuedThreads includes waiting threads
1329	>	*/
1330	>	public void testGetQueuedThreads() {
1331	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1332	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1333	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1334	>	try {
1335	>	assertTrue(lock.getQueuedThreads().isEmpty());
1336	>	lock.writeLock().lock();
1337	>	assertTrue(lock.getQueuedThreads().isEmpty());
1338	>	t1.start();
1339	>	Thread.sleep(SHORT_DELAY_MS);
1340	>	assertTrue(lock.getQueuedThreads().contains(t1));
1341	>	t2.start();
1342	>	Thread.sleep(SHORT_DELAY_MS);
1343	>	assertTrue(lock.getQueuedThreads().contains(t1));
1344	>	assertTrue(lock.getQueuedThreads().contains(t2));
1345	>	t1.interrupt();
1346	>	Thread.sleep(SHORT_DELAY_MS);
1347	>	assertFalse(lock.getQueuedThreads().contains(t1));
1348	>	assertTrue(lock.getQueuedThreads().contains(t2));
1349	>	lock.writeLock().unlock();
1350	>	Thread.sleep(SHORT_DELAY_MS);
1351	>	assertTrue(lock.getQueuedThreads().isEmpty());
1352	>	t1.join();
1353	>	t2.join();
1354	>	} catch(Exception e){
1355	>	unexpectedException();
1356	>	}
1357	>	}
1358	>
1359	>	/**
1360	>	* hasWaiters throws NPE if null
1361	>	*/
1362	>	public void testHasWaitersNPE() {
1363	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1364	>	try {
1365	>	lock.hasWaiters(null);
1366	>	shouldThrow();
1367	>	} catch (NullPointerException success) {
1368	>	} catch (Exception ex) {
1369	>	unexpectedException();
1370	>	}
1371	>	}
1372	>
1373	>	/**
1374	>	* getWaitQueueLength throws NPE if null
1375	>	*/
1376	>	public void testGetWaitQueueLengthNPE() {
1377	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1378	>	try {
1379	>	lock.getWaitQueueLength(null);
1380	>	shouldThrow();
1381	>	} catch (NullPointerException success) {
1382	>	} catch (Exception ex) {
1383	>	unexpectedException();
1384	>	}
1385	>	}
1386	>
1387	>
1388	>	/**
1389	>	* getWaitingThreads throws NPE if null
1390	>	*/
1391	>	public void testGetWaitingThreadsNPE() {
1392	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1393	>	try {
1394	>	lock.getWaitingThreads(null);
1395	>	shouldThrow();
1396	>	} catch (NullPointerException success) {
1397	>	} catch (Exception ex) {
1398	>	unexpectedException();
1399	>	}
1400	>	}
1401	>
1402	>	/**
1403	>	* hasWaiters throws IAE if not owned
1404	>	*/
1405	>	public void testHasWaitersIAE() {
1406	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1407	>	final Condition c = (lock.writeLock().newCondition());
1408	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1409	>	try {
1410	>	lock2.hasWaiters(c);
1411	>	shouldThrow();
1412	>	} catch (IllegalArgumentException success) {
1413	>	} catch (Exception ex) {
1414	>	unexpectedException();
1415	>	}
1416	>	}
1417	>
1418	>	/**
1419	>	* hasWaiters throws IMSE if not locked
1420	>	*/
1421	>	public void testHasWaitersIMSE() {
1422	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1423	>	final Condition c = (lock.writeLock().newCondition());
1424	>	try {
1425	>	lock.hasWaiters(c);
1426	>	shouldThrow();
1427	>	} catch (IllegalMonitorStateException success) {
1428	>	} catch (Exception ex) {
1429	>	unexpectedException();
1430	>	}
1431	>	}
1432	>
1433	>
1434	>	/**
1435	>	* getWaitQueueLength throws IAE if not owned
1436	>	*/
1437	>	public void testGetWaitQueueLengthIAE() {
1438	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1439	>	final Condition c = (lock.writeLock().newCondition());
1440	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1441	>	try {
1442	>	lock2.getWaitQueueLength(c);
1443	>	shouldThrow();
1444	>	} catch (IllegalArgumentException success) {
1445	>	} catch (Exception ex) {
1446	>	unexpectedException();
1447	>	}
1448	>	}
1449	>
1450	>	/**
1451	>	* getWaitQueueLength throws IMSE if not locked
1452	>	*/
1453	>	public void testGetWaitQueueLengthIMSE() {
1454	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1455	>	final Condition c = (lock.writeLock().newCondition());
1456	>	try {
1457	>	lock.getWaitQueueLength(c);
1458	>	shouldThrow();
1459	>	} catch (IllegalMonitorStateException success) {
1460	>	} catch (Exception ex) {
1461	>	unexpectedException();
1462	>	}
1463	>	}
1464	>
1465	>
1466	>	/**
1467	>	* getWaitingThreads throws IAE if not owned
1468	>	*/
1469	>	public void testGetWaitingThreadsIAE() {
1470	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1471	>	final Condition c = (lock.writeLock().newCondition());
1472	>	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1473	>	try {
1474	>	lock2.getWaitingThreads(c);
1475	>	shouldThrow();
1476	>	} catch (IllegalArgumentException success) {
1477	>	} catch (Exception ex) {
1478	>	unexpectedException();
1479	>	}
1480	>	}
1481	>
1482	>	/**
1483	>	* getWaitingThreads throws IMSE if not locked
1484	>	*/
1485	>	public void testGetWaitingThreadsIMSE() {
1486	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1487	>	final Condition c = (lock.writeLock().newCondition());
1488	>	try {
1489	>	lock.getWaitingThreads(c);
1490	>	shouldThrow();
1491	>	} catch (IllegalMonitorStateException success) {
1492	>	} catch (Exception ex) {
1493	>	unexpectedException();
1494	>	}
1495	>	}
1496	>
1497	>
1498	>	/**
1499	>	* hasWaiters returns true when a thread is waiting, else false
1500	>	*/
1501	>	public void testHasWaiters() {
1502	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1503	>	final Condition c = (lock.writeLock().newCondition());
1504	>	Thread t = new Thread(new Runnable() {
1505	>	public void run() {
1506	>	try {
1507	>	lock.writeLock().lock();
1508	>	threadAssertFalse(lock.hasWaiters(c));
1509	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1510	>	c.await();
1511	>	lock.writeLock().unlock();
1512	>	}
1513	>	catch(InterruptedException e) {
1514	>	threadUnexpectedException();
1515	>	}
1516	>	}
1517	>	});
1518	>
1519	>	try {
1520	>	t.start();
1521	>	Thread.sleep(SHORT_DELAY_MS);
1522	>	lock.writeLock().lock();
1523	>	assertTrue(lock.hasWaiters(c));
1524	>	assertEquals(1, lock.getWaitQueueLength(c));
1525	>	c.signal();
1526	>	lock.writeLock().unlock();
1527	>	Thread.sleep(SHORT_DELAY_MS);
1528	>	lock.writeLock().lock();
1529	>	assertFalse(lock.hasWaiters(c));
1530	>	assertEquals(0, lock.getWaitQueueLength(c));
1531	>	lock.writeLock().unlock();
1532	>	t.join(SHORT_DELAY_MS);
1533	>	assertFalse(t.isAlive());
1534	>	}
1535	>	catch (Exception ex) {
1536	>	unexpectedException();
1537	>	}
1538	>	}
1539	>
1540	>	/**
1541	>	* getWaitQueueLength returns number of waiting threads
1542	>	*/
1543	>	public void testGetWaitQueueLength() {
1544	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1545	>	final Condition c = (lock.writeLock().newCondition());
1546	>	Thread t = new Thread(new Runnable() {
1547	>	public void run() {
1548	>	try {
1549	>	lock.writeLock().lock();
1550	>	threadAssertFalse(lock.hasWaiters(c));
1551	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1552	>	c.await();
1553	>	lock.writeLock().unlock();
1554	>	}
1555	>	catch(InterruptedException e) {
1556	>	threadUnexpectedException();
1557	>	}
1558	>	}
1559	>	});
1560	>
1561	>	try {
1562	>	t.start();
1563	>	Thread.sleep(SHORT_DELAY_MS);
1564	>	lock.writeLock().lock();
1565	>	assertTrue(lock.hasWaiters(c));
1566	>	assertEquals(1, lock.getWaitQueueLength(c));
1567	>	c.signal();
1568	>	lock.writeLock().unlock();
1569	>	Thread.sleep(SHORT_DELAY_MS);
1570	>	lock.writeLock().lock();
1571	>	assertFalse(lock.hasWaiters(c));
1572	>	assertEquals(0, lock.getWaitQueueLength(c));
1573	>	lock.writeLock().unlock();
1574	>	t.join(SHORT_DELAY_MS);
1575	>	assertFalse(t.isAlive());
1576	>	}
1577	>	catch (Exception ex) {
1578	>	unexpectedException();
1579		}
1580		}
1581
1582
1583	+	/**
1584	+	* getWaitingThreads returns only and all waiting threads
1585	+	*/
1586	+	public void testGetWaitingThreads() {
1587	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1588	+	final Condition c = lock.writeLock().newCondition();
1589	+	Thread t1 = new Thread(new Runnable() {
1590	+	public void run() {
1591	+	try {
1592	+	lock.writeLock().lock();
1593	+	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1594	+	c.await();
1595	+	lock.writeLock().unlock();
1596	+	}
1597	+	catch(InterruptedException e) {
1598	+	threadUnexpectedException();
1599	+	}
1600	+	}
1601	+	});
1602	+
1603	+	Thread t2 = new Thread(new Runnable() {
1604	+	public void run() {
1605	+	try {
1606	+	lock.writeLock().lock();
1607	+	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1608	+	c.await();
1609	+	lock.writeLock().unlock();
1610	+	}
1611	+	catch(InterruptedException e) {
1612	+	threadUnexpectedException();
1613	+	}
1614	+	}
1615	+	});
1616	+
1617	+	try {
1618	+	lock.writeLock().lock();
1619	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1620	+	lock.writeLock().unlock();
1621	+	t1.start();
1622	+	Thread.sleep(SHORT_DELAY_MS);
1623	+	t2.start();
1624	+	Thread.sleep(SHORT_DELAY_MS);
1625	+	lock.writeLock().lock();
1626	+	assertTrue(lock.hasWaiters(c));
1627	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1628	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1629	+	c.signalAll();
1630	+	lock.writeLock().unlock();
1631	+	Thread.sleep(SHORT_DELAY_MS);
1632	+	lock.writeLock().lock();
1633	+	assertFalse(lock.hasWaiters(c));
1634	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1635	+	lock.writeLock().unlock();
1636	+	t1.join(SHORT_DELAY_MS);
1637	+	t2.join(SHORT_DELAY_MS);
1638	+	assertFalse(t1.isAlive());
1639	+	assertFalse(t2.isAlive());
1640	+	}
1641	+	catch (Exception ex) {
1642	+	unexpectedException();
1643	+	}
1644	+	}
1645	+
1646	+	/**
1647	+	* toString indicates current lock state
1648	+	*/
1649	+	public void testToString() {
1650	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1651	+	String us = lock.toString();
1652	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1653	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1654	+	lock.writeLock().lock();
1655	+	String ws = lock.toString();
1656	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1657	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1658	+	lock.writeLock().unlock();
1659	+	lock.readLock().lock();
1660	+	lock.readLock().lock();
1661	+	String rs = lock.toString();
1662	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1663	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1664	+	}
1665	+
1666	+	/**
1667	+	* readLock.toString indicates current lock state
1668	+	*/
1669	+	public void testReadLockToString() {
1670	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1671	+	String us = lock.readLock().toString();
1672	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1673	+	lock.readLock().lock();
1674	+	lock.readLock().lock();
1675	+	String rs = lock.readLock().toString();
1676	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1677	+	}
1678	+
1679	+	/**
1680	+	* writeLock.toString indicates current lock state
1681	+	*/
1682	+	public void testWriteLockToString() {
1683	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1684	+	String us = lock.writeLock().toString();
1685	+	assertTrue(us.indexOf("Unlocked") >= 0);
1686	+	lock.writeLock().lock();
1687	+	String ls = lock.writeLock().toString();
1688	+	assertTrue(ls.indexOf("Locked") >= 0);
1689	+	}
1690	+
1691		}

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