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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.1 by dl, Sun Aug 31 19:24:55 2003 UTC vs.
Revision 1.38 by jsr166, Sat Nov 21 21:59:50 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.*;
10		import java.util.concurrent.locks.*;
11		import java.util.concurrent.*;
12	+	import static java.util.concurrent.TimeUnit.MILLISECONDS;
13	+	import java.io.*;
14	+	import java.util.*;
15
16	<	public class ReentrantReadWriteLockTest extends TestCase {
13	<	static int HOLD_COUNT_TEST_LIMIT = 20;
14	<
16	>	public class ReentrantReadWriteLockTest extends JSR166TestCase {
17		public static void main(String[] args) {
18	<	junit.textui.TestRunner.run (suite());
18	>	junit.textui.TestRunner.run (suite());
19		}
18	–
20		public static Test suite() {
21	<	return new TestSuite(ReentrantReadWriteLockTest.class);
21	>	return new TestSuite(ReentrantReadWriteLockTest.class);
22		}
23
24	+	/**
25	+	* A runnable calling lockInterruptibly
26	+	*/
27	+	class InterruptibleLockRunnable extends CheckedRunnable {
28	+	final ReentrantReadWriteLock lock;
29	+	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
30	+	public void realRun() throws InterruptedException {
31	+	lock.writeLock().lockInterruptibly();
32	+	}
33	+	}
34	+
35	+
36	+	/**
37	+	* A runnable calling lockInterruptibly that expects to be
38	+	* interrupted
39	+	*/
40	+	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
41	+	final ReentrantReadWriteLock lock;
42	+	InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
43	+	public void realRun() throws InterruptedException {
44	+	lock.writeLock().lockInterruptibly();
45	+	}
46	+	}
47	+
48	+	/**
49	+	* Subclass to expose protected methods
50	+	*/
51	+	static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
52	+	PublicReentrantReadWriteLock() { super(); }
53	+	public Collection<Thread> getQueuedThreads() {
54	+	return super.getQueuedThreads();
55	+	}
56	+	public Collection<Thread> getWaitingThreads(Condition c) {
57	+	return super.getWaitingThreads(c);
58	+	}
59	+	}
60	+
61	+	/**
62	+	* Constructor sets given fairness, and is in unlocked state
63	+	*/
64	+	public void testConstructor() {
65	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
66	+	assertFalse(rl.isFair());
67	+	assertFalse(rl.isWriteLocked());
68	+	assertEquals(0, rl.getReadLockCount());
69	+	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
70	+	assertTrue(r2.isFair());
71	+	assertFalse(r2.isWriteLocked());
72	+	assertEquals(0, r2.getReadLockCount());
73	+	ReentrantReadWriteLock r3 = new ReentrantReadWriteLock(false);
74	+	assertFalse(r3.isFair());
75	+	assertFalse(r3.isWriteLocked());
76	+	assertEquals(0, r3.getReadLockCount());
77	+	}
78	+
79	+	/**
80	+	* write-locking and read-locking an unlocked lock succeed
81	+	*/
82	+	public void testLock() {
83	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
84	+	rl.writeLock().lock();
85	+	assertTrue(rl.isWriteLocked());
86	+	assertTrue(rl.isWriteLockedByCurrentThread());
87	+	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	+	/**
189	+	* write-lockInterruptibly is interruptible
190	+	*/
191	+	public void testWriteLockInterruptibly_Interrupted() throws Exception {
192	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
193	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
194	+	public void realRun() throws InterruptedException {
195	+	lock.writeLock().lockInterruptibly();
196	+	lock.writeLock().unlock();
197	+	lock.writeLock().lockInterruptibly();
198	+	lock.writeLock().unlock();
199	+	}});
200	+
201	+	lock.writeLock().lock();
202	+	t.start();
203	+	Thread.sleep(SHORT_DELAY_MS);
204	+	t.interrupt();
205	+	Thread.sleep(SHORT_DELAY_MS);
206	+	lock.writeLock().unlock();
207	+	t.join();
208	+	}
209	+
210	+	/**
211	+	* timed write-tryLock is interruptible
212	+	*/
213	+	public void testWriteTryLock_Interrupted() throws InterruptedException {
214	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
215	+	lock.writeLock().lock();
216	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
217	+	public void realRun() throws InterruptedException {
218	+	lock.writeLock().tryLock(SMALL_DELAY_MS, MILLISECONDS);
219	+	}});
220	+
221	+	t.start();
222	+	Thread.sleep(SHORT_DELAY_MS);
223	+	t.interrupt();
224	+	lock.writeLock().unlock();
225	+	t.join();
226	+	}
227	+
228	+	/**
229	+	* read-lockInterruptibly is interruptible
230	+	*/
231	+	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
232	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
233	+	lock.writeLock().lock();
234	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
235	+	public void realRun() throws InterruptedException {
236	+	lock.readLock().lockInterruptibly();
237	+	}});
238	+
239	+	t.start();
240	+	Thread.sleep(SHORT_DELAY_MS);
241	+	t.interrupt();
242	+	Thread.sleep(SHORT_DELAY_MS);
243	+	lock.writeLock().unlock();
244	+	t.join();
245	+	}
246	+
247	+	/**
248	+	* timed read-tryLock is interruptible
249	+	*/
250	+	public void testReadTryLock_Interrupted() throws InterruptedException {
251	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
252	+	lock.writeLock().lock();
253	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
254	+	public void realRun() throws InterruptedException {
255	+	lock.readLock().tryLock(1000,MILLISECONDS);
256	+	}});
257	+
258	+	t.start();
259	+	t.interrupt();
260	+	t.join();
261	+	}
262	+
263	+
264	+	/**
265	+	* write-tryLock fails if locked
266	+	*/
267	+	public void testWriteTryLockWhenLocked() throws InterruptedException {
268	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
269	+	lock.writeLock().lock();
270	+	Thread t = new Thread(new CheckedRunnable() {
271	+	public void realRun() {
272	+	threadAssertFalse(lock.writeLock().tryLock());
273	+	}});
274	+
275	+	t.start();
276	+	t.join();
277	+	lock.writeLock().unlock();
278	+	}
279	+
280	+	/**
281	+	* read-tryLock fails if locked
282	+	*/
283	+	public void testReadTryLockWhenLocked() throws InterruptedException {
284	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
285	+	lock.writeLock().lock();
286	+	Thread t = new Thread(new CheckedRunnable() {
287	+	public void realRun() {
288	+	threadAssertFalse(lock.readLock().tryLock());
289	+	}});
290	+
291	+	t.start();
292	+	t.join();
293	+	lock.writeLock().unlock();
294	+	}
295	+
296	+	/**
297	+	* Multiple threads can hold a read lock when not write-locked
298	+	*/
299	+	public void testMultipleReadLocks() throws InterruptedException {
300	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
301	+	lock.readLock().lock();
302	+	Thread t = new Thread(new CheckedRunnable() {
303	+	public void realRun() {
304	+	threadAssertTrue(lock.readLock().tryLock());
305	+	lock.readLock().unlock();
306	+	}});
307	+
308	+	t.start();
309	+	t.join();
310	+	lock.readLock().unlock();
311	+	}
312	+
313	+	/**
314	+	* A writelock succeeds after reading threads unlock
315	+	*/
316	+	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
317	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
318	+	lock.readLock().lock();
319	+	Thread t1 = new Thread(new CheckedRunnable() {
320	+	public void realRun() {
321	+	lock.readLock().lock();
322	+	lock.readLock().unlock();
323	+	}});
324	+	Thread t2 = new Thread(new CheckedRunnable() {
325	+	public void realRun() {
326	+	lock.writeLock().lock();
327	+	lock.writeLock().unlock();
328	+	}});
329	+
330	+	t1.start();
331	+	t2.start();
332	+	Thread.sleep(SHORT_DELAY_MS);
333	+	lock.readLock().unlock();
334	+	t1.join(MEDIUM_DELAY_MS);
335	+	t2.join(MEDIUM_DELAY_MS);
336	+	assertTrue(!t1.isAlive());
337	+	assertTrue(!t2.isAlive());
338	+	}
339	+
340	+	/**
341	+	* Readlocks succeed after a writing thread unlocks
342	+	*/
343	+	public void testReadAfterWriteLock() throws InterruptedException {
344	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
345	+	lock.writeLock().lock();
346	+	Thread t1 = new Thread(new CheckedRunnable() {
347	+	public void realRun() {
348	+	lock.readLock().lock();
349	+	lock.readLock().unlock();
350	+	}});
351	+	Thread t2 = new Thread(new CheckedRunnable() {
352	+	public void realRun() {
353	+	lock.readLock().lock();
354	+	lock.readLock().unlock();
355	+	}});
356	+
357	+	t1.start();
358	+	t2.start();
359	+	Thread.sleep(SHORT_DELAY_MS);
360	+	lock.writeLock().unlock();
361	+	t1.join(MEDIUM_DELAY_MS);
362	+	t2.join(MEDIUM_DELAY_MS);
363	+	assertTrue(!t1.isAlive());
364	+	assertTrue(!t2.isAlive());
365	+	}
366	+
367	+	/**
368	+	* Read trylock succeeds if write locked by current thread
369	+	*/
370	+	public void testReadHoldingWriteLock() {
371	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
372	+	lock.writeLock().lock();
373	+	assertTrue(lock.readLock().tryLock());
374	+	lock.readLock().unlock();
375	+	lock.writeLock().unlock();
376	+	}
377	+
378	+	/**
379	+	* Read lock succeeds if write locked by current thread even if
380	+	* other threads are waiting for readlock
381	+	*/
382	+	public void testReadHoldingWriteLock2() throws InterruptedException {
383	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
384	+	lock.writeLock().lock();
385	+	Thread t1 = new Thread(new CheckedRunnable() {
386	+	public void realRun() {
387	+	lock.readLock().lock();
388	+	lock.readLock().unlock();
389	+	}});
390	+	Thread t2 = new Thread(new CheckedRunnable() {
391	+	public void realRun() {
392	+	lock.readLock().lock();
393	+	lock.readLock().unlock();
394	+	}});
395	+
396	+	t1.start();
397	+	t2.start();
398	+	lock.readLock().lock();
399	+	lock.readLock().unlock();
400	+	Thread.sleep(SHORT_DELAY_MS);
401	+	lock.readLock().lock();
402	+	lock.readLock().unlock();
403	+	lock.writeLock().unlock();
404	+	t1.join(MEDIUM_DELAY_MS);
405	+	t2.join(MEDIUM_DELAY_MS);
406	+	assertTrue(!t1.isAlive());
407	+	assertTrue(!t2.isAlive());
408	+	}
409	+
410	+	/**
411	+	*  Read lock succeeds if write locked by current thread even if
412	+	* other threads are waiting for writelock
413	+	*/
414	+	public void testReadHoldingWriteLock3() throws InterruptedException {
415	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
416	+	lock.writeLock().lock();
417	+	Thread t1 = new Thread(new CheckedRunnable() {
418	+	public void realRun() {
419	+	lock.writeLock().lock();
420	+	lock.writeLock().unlock();
421	+	}});
422	+	Thread t2 = new Thread(new CheckedRunnable() {
423	+	public void realRun() {
424	+	lock.writeLock().lock();
425	+	lock.writeLock().unlock();
426	+	}});
427	+
428	+	t1.start();
429	+	t2.start();
430	+	lock.readLock().lock();
431	+	lock.readLock().unlock();
432	+	Thread.sleep(SHORT_DELAY_MS);
433	+	lock.readLock().lock();
434	+	lock.readLock().unlock();
435	+	lock.writeLock().unlock();
436	+	t1.join(MEDIUM_DELAY_MS);
437	+	t2.join(MEDIUM_DELAY_MS);
438	+	assertTrue(!t1.isAlive());
439	+	assertTrue(!t2.isAlive());
440	+	}
441	+
442	+
443	+	/**
444	+	*  Write lock succeeds if write locked by current thread even if
445	+	* other threads are waiting for writelock
446	+	*/
447	+	public void testWriteHoldingWriteLock4() throws InterruptedException {
448	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
449	+	lock.writeLock().lock();
450	+	Thread t1 = new Thread(new CheckedRunnable() {
451	+	public void realRun() {
452	+	lock.writeLock().lock();
453	+	lock.writeLock().unlock();
454	+	}});
455	+	Thread t2 = new Thread(new CheckedRunnable() {
456	+	public void realRun() {
457	+	lock.writeLock().lock();
458	+	lock.writeLock().unlock();
459	+	}});
460	+
461	+	t1.start();
462	+	t2.start();
463	+	lock.writeLock().lock();
464	+	lock.writeLock().unlock();
465	+	Thread.sleep(SHORT_DELAY_MS);
466	+	lock.writeLock().lock();
467	+	lock.writeLock().unlock();
468	+	lock.writeLock().unlock();
469	+	t1.join(MEDIUM_DELAY_MS);
470	+	t2.join(MEDIUM_DELAY_MS);
471	+	assertTrue(!t1.isAlive());
472	+	assertTrue(!t2.isAlive());
473	+	}
474	+
475	+
476	+	/**
477	+	* Fair Read trylock succeeds if write locked by current thread
478	+	*/
479	+	public void testReadHoldingWriteLockFair() {
480	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
481	+	lock.writeLock().lock();
482	+	assertTrue(lock.readLock().tryLock());
483	+	lock.readLock().unlock();
484	+	lock.writeLock().unlock();
485	+	}
486	+
487	+	/**
488	+	* Fair Read lock succeeds if write locked by current thread even if
489	+	* other threads are waiting for readlock
490	+	*/
491	+	public void testReadHoldingWriteLockFair2() throws InterruptedException {
492	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
493	+	lock.writeLock().lock();
494	+	Thread t1 = new Thread(new CheckedRunnable() {
495	+	public void realRun() {
496	+	lock.readLock().lock();
497	+	lock.readLock().unlock();
498	+	}});
499	+	Thread t2 = new Thread(new CheckedRunnable() {
500	+	public void realRun() {
501	+	lock.readLock().lock();
502	+	lock.readLock().unlock();
503	+	}});
504	+
505	+	t1.start();
506	+	t2.start();
507	+	lock.readLock().lock();
508	+	lock.readLock().unlock();
509	+	Thread.sleep(SHORT_DELAY_MS);
510	+	lock.readLock().lock();
511	+	lock.readLock().unlock();
512	+	lock.writeLock().unlock();
513	+	t1.join(MEDIUM_DELAY_MS);
514	+	t2.join(MEDIUM_DELAY_MS);
515	+	assertTrue(!t1.isAlive());
516	+	assertTrue(!t2.isAlive());
517	+	}
518	+
519	+
520	+	/**
521	+	* Fair Read lock succeeds if write locked by current thread even if
522	+	* other threads are waiting for writelock
523	+	*/
524	+	public void testReadHoldingWriteLockFair3() throws InterruptedException {
525	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
526	+	lock.writeLock().lock();
527	+	Thread t1 = new Thread(new CheckedRunnable() {
528	+	public void realRun() {
529	+	lock.writeLock().lock();
530	+	lock.writeLock().unlock();
531	+	}});
532	+	Thread t2 = new Thread(new CheckedRunnable() {
533	+	public void realRun() {
534	+	lock.writeLock().lock();
535	+	lock.writeLock().unlock();
536	+	}});
537	+
538	+	t1.start();
539	+	t2.start();
540	+	lock.readLock().lock();
541	+	lock.readLock().unlock();
542	+	Thread.sleep(SHORT_DELAY_MS);
543	+	lock.readLock().lock();
544	+	lock.readLock().unlock();
545	+	lock.writeLock().unlock();
546	+	t1.join(MEDIUM_DELAY_MS);
547	+	t2.join(MEDIUM_DELAY_MS);
548	+	assertTrue(!t1.isAlive());
549	+	assertTrue(!t2.isAlive());
550	+	}
551	+
552	+
553	+	/**
554	+	* Fair Write lock succeeds if write locked by current thread even if
555	+	* other threads are waiting for writelock
556	+	*/
557	+	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
558	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
559	+	lock.writeLock().lock();
560	+	Thread t1 = new Thread(new CheckedRunnable() {
561	+	public void realRun() {
562	+	lock.writeLock().lock();
563	+	lock.writeLock().unlock();
564	+	}});
565	+	Thread t2 = new Thread(new CheckedRunnable() {
566	+	public void realRun() {
567	+	lock.writeLock().lock();
568	+	lock.writeLock().unlock();
569	+	}});
570	+
571	+	t1.start();
572	+	t2.start();
573	+	Thread.sleep(SHORT_DELAY_MS);
574	+	assertTrue(lock.isWriteLockedByCurrentThread());
575	+	assertTrue(lock.getWriteHoldCount() == 1);
576	+	lock.writeLock().lock();
577	+	assertTrue(lock.getWriteHoldCount() == 2);
578	+	lock.writeLock().unlock();
579	+	lock.writeLock().lock();
580	+	lock.writeLock().unlock();
581	+	lock.writeLock().unlock();
582	+	t1.join(MEDIUM_DELAY_MS);
583	+	t2.join(MEDIUM_DELAY_MS);
584	+	assertTrue(!t1.isAlive());
585	+	assertTrue(!t2.isAlive());
586	+	}
587	+
588	+
589	+	/**
590	+	* Read tryLock succeeds if readlocked but not writelocked
591	+	*/
592	+	public void testTryLockWhenReadLocked() throws InterruptedException {
593	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
594	+	lock.readLock().lock();
595	+	Thread t = new Thread(new CheckedRunnable() {
596	+	public void realRun() {
597	+	threadAssertTrue(lock.readLock().tryLock());
598	+	lock.readLock().unlock();
599	+	}});
600	+
601	+	t.start();
602	+	t.join();
603	+	lock.readLock().unlock();
604	+	}
605	+
606	+
607	+
608	+	/**
609	+	* write tryLock fails when readlocked
610	+	*/
611	+	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
612	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
613	+	lock.readLock().lock();
614	+	Thread t = new Thread(new CheckedRunnable() {
615	+	public void realRun() {
616	+	threadAssertFalse(lock.writeLock().tryLock());
617	+	}});
618	+
619	+	t.start();
620	+	t.join();
621	+	lock.readLock().unlock();
622	+	}
623	+
624	+
625	+	/**
626	+	* Fair Read tryLock succeeds if readlocked but not writelocked
627	+	*/
628	+	public void testTryLockWhenReadLockedFair() throws InterruptedException {
629	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
630	+	lock.readLock().lock();
631	+	Thread t = new Thread(new CheckedRunnable() {
632	+	public void realRun() {
633	+	threadAssertTrue(lock.readLock().tryLock());
634	+	lock.readLock().unlock();
635	+	}});
636	+
637	+	t.start();
638	+	t.join();
639	+	lock.readLock().unlock();
640	+	}
641	+
642	+
643	+
644	+	/**
645	+	* Fair write tryLock fails when readlocked
646	+	*/
647	+	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
648	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
649	+	lock.readLock().lock();
650	+	Thread t = new Thread(new CheckedRunnable() {
651	+	public void realRun() {
652	+	threadAssertFalse(lock.writeLock().tryLock());
653	+	}});
654	+
655	+	t.start();
656	+	t.join();
657	+	lock.readLock().unlock();
658	+	}
659	+
660	+
661	+
662	+	/**
663	+	* write timed tryLock times out if locked
664	+	*/
665	+	public void testWriteTryLock_Timeout() throws InterruptedException {
666	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
667	+	lock.writeLock().lock();
668	+	Thread t = new Thread(new CheckedRunnable() {
669	+	public void realRun() throws InterruptedException {
670	+	threadAssertFalse(lock.writeLock().tryLock(1, MILLISECONDS));
671	+	}});
672	+
673	+	t.start();
674	+	t.join();
675	+	assertTrue(lock.writeLock().isHeldByCurrentThread());
676	+	lock.writeLock().unlock();
677	+	}
678	+
679	+	/**
680	+	* read timed tryLock times out if write-locked
681	+	*/
682	+	public void testReadTryLock_Timeout() throws InterruptedException {
683	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
684	+	lock.writeLock().lock();
685	+	Thread t = new Thread(new CheckedRunnable() {
686	+	public void realRun() throws InterruptedException {
687	+	threadAssertFalse(lock.readLock().tryLock(1, MILLISECONDS));
688	+	}});
689	+
690	+	t.start();
691	+	t.join();
692	+	assertTrue(lock.writeLock().isHeldByCurrentThread());
693	+	lock.writeLock().unlock();
694	+	}
695	+
696	+
697	+	/**
698	+	* write lockInterruptibly succeeds if lock free else is interruptible
699	+	*/
700	+	public void testWriteLockInterruptibly() throws InterruptedException {
701	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
702	+	lock.writeLock().lockInterruptibly();
703	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
704	+	public void realRun() throws InterruptedException {
705	+	lock.writeLock().lockInterruptibly();
706	+	}});
707	+
708	+	t.start();
709	+	Thread.sleep(SHORT_DELAY_MS);
710	+	t.interrupt();
711	+	Thread.sleep(SHORT_DELAY_MS);
712	+	t.join();
713	+	lock.writeLock().unlock();
714	+	}
715	+
716	+	/**
717	+	*  read lockInterruptibly succeeds if lock free else is interruptible
718	+	*/
719	+	public void testReadLockInterruptibly() throws InterruptedException {
720	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
721	+	lock.writeLock().lockInterruptibly();
722	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
723	+	public void realRun() throws InterruptedException {
724	+	lock.readLock().lockInterruptibly();
725	+	}});
726	+
727	+	t.start();
728	+	Thread.sleep(SHORT_DELAY_MS);
729	+	t.interrupt();
730	+	t.join();
731	+	lock.writeLock().unlock();
732	+	}
733	+
734	+	/**
735	+	* Calling await without holding lock throws IllegalMonitorStateException
736	+	*/
737	+	public void testAwait_IllegalMonitor() throws InterruptedException {
738	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
739	+	final Condition c = lock.writeLock().newCondition();
740	+	try {
741	+	c.await();
742	+	shouldThrow();
743	+	} catch (IllegalMonitorStateException success) {}
744	+	}
745	+
746	+	/**
747	+	* Calling signal without holding lock throws IllegalMonitorStateException
748	+	*/
749	+	public void testSignal_IllegalMonitor() {
750	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
751	+	final Condition c = lock.writeLock().newCondition();
752	+	try {
753	+	c.signal();
754	+	shouldThrow();
755	+	} catch (IllegalMonitorStateException success) {}
756	+	}
757	+
758	+	/**
759	+	* awaitNanos without a signal times out
760	+	*/
761	+	public void testAwaitNanos_Timeout() throws InterruptedException {
762	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
763	+	final Condition c = lock.writeLock().newCondition();
764	+
765	+	lock.writeLock().lock();
766	+	long t = c.awaitNanos(100);
767	+	assertTrue(t <= 0);
768	+	lock.writeLock().unlock();
769	+	}
770	+
771	+
772	+	/**
773	+	*  timed await without a signal times out
774	+	*/
775	+	public void testAwait_Timeout() throws InterruptedException {
776	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
777	+	final Condition c = lock.writeLock().newCondition();
778	+	lock.writeLock().lock();
779	+	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
780	+	lock.writeLock().unlock();
781	+	}
782	+
783	+	/**
784	+	* awaitUntil without a signal times out
785	+	*/
786	+	public void testAwaitUntil_Timeout() throws InterruptedException {
787	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
788	+	final Condition c = lock.writeLock().newCondition();
789	+	lock.writeLock().lock();
790	+	java.util.Date d = new java.util.Date();
791	+	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
792	+	lock.writeLock().unlock();
793	+	}
794	+
795	+	/**
796	+	* await returns when signalled
797	+	*/
798	+	public void testAwait() throws InterruptedException {
799	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
800	+	final Condition c = lock.writeLock().newCondition();
801	+	Thread t = new Thread(new CheckedRunnable() {
802	+	public void realRun() throws InterruptedException {
803	+	lock.writeLock().lock();
804	+	c.await();
805	+	lock.writeLock().unlock();
806	+	}});
807	+
808	+	t.start();
809	+	Thread.sleep(SHORT_DELAY_MS);
810	+	lock.writeLock().lock();
811	+	c.signal();
812	+	lock.writeLock().unlock();
813	+	t.join(SHORT_DELAY_MS);
814	+	assertFalse(t.isAlive());
815	+	}
816	+
817	+	/** A helper class for uninterruptible wait tests */
818	+	class UninterruptableThread extends Thread {
819	+	private Lock lock;
820	+	private Condition c;
821	+
822	+	public volatile boolean canAwake = false;
823	+	public volatile boolean interrupted = false;
824	+	public volatile boolean lockStarted = false;
825	+
826	+	public UninterruptableThread(Lock lock, Condition c) {
827	+	this.lock = lock;
828	+	this.c = c;
829	+	}
830
831	<	private static long SHORT_DELAY_MS = 100;
832	<	private static long MEDIUM_DELAY_MS = 1000;
833	<	private static long LONG_DELAY_MS = 10000;
834	<
835	<	/*
836	<	* Unlocks an unlocked lock, throws Illegal Monitor State
837	<	*
838	<	*/
839	<
840	<	public void testIllegalMonitorStateException(){
841	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
842	<	try{
843	<	rl.writeLock().unlock();
844	<	fail("Should of thown Illegal Monitor State Exception");
845	<
846	<	}catch(IllegalMonitorStateException sucess){}
847	<
848	<
849	<	}
850	<
851	<	/*
852	<	* makes a lock, locks it, tries to aquire the lock in another thread
853	<	* interrupts that thread and waits for an interrupted Exception to
854	<	* be thrown.
855	<	*/
856	<
857	<	public void testInterruptedException(){
858	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
859	<	lock.writeLock().lock();
860	<	Thread t = new Thread(new Runnable() {
861	<	public void run(){
862	<	try{
863	<	lock.writeLock().lockInterruptibly();
864	<	fail("should throw");
865	<	}catch(InterruptedException sucess){}
866	<	}
867	<	});
868	<	t.start();
869	<	t.interrupt();
870	<	lock.writeLock().unlock();
871	<	}
872	<
873	<	/*
874	<	* tests for interrupted exception on a timed wait
875	<	*
876	<	*/
877	<
878	<
879	<	public void testInterruptedException2(){
880	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
881	<	lock.writeLock().lock();
882	<	Thread t = new Thread(new Runnable() {
883	<	public void run(){
884	<	try{
885	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
886	<	fail("should throw");
887	<	}catch(InterruptedException sucess){}
888	<	}
889	<	});
890	<	t.start();
891	<	t.interrupt();
892	<	}
893	<
894	<
895	<
896	<	/*
897	<	* current thread locks interruptibly the thread
898	<	* another thread tries to aquire the lock and blocks
899	<	* on the call. interrupt the attempted aquireLock
900	<	* assert that the first lock() call actually locked the lock
901	<	* assert that the current thread is the one holding the lock
902	<	*/
903	<
904	<	public void testLockedInterruptibly() {
905	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
906	<	try {lock.writeLock().lockInterruptibly();} catch(Exception e) {}
907	<	Thread t = new Thread(new Runnable() {
908	<	public void run() {
909	<	try {
910	<	lock.writeLock().lockInterruptibly();
911	<	fail("Failed to generate an Interrupted Exception");
912	<	}
913	<	catch(InterruptedException e) {}
914	<	}
915	<	});
916	<	t.start();
917	<	t.interrupt();
831	>	public synchronized void run() {
832	>	lock.lock();
833	>	lockStarted = true;
834	>
835	>	while (!canAwake) {
836	>	c.awaitUninterruptibly();
837	>	}
838	>
839	>	interrupted = isInterrupted();
840	>	lock.unlock();
841	>	}
842	>	}
843	>
844	>	/**
845	>	* awaitUninterruptibly doesn't abort on interrupt
846	>	*/
847	>	public void testAwaitUninterruptibly() throws InterruptedException {
848	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
849	>	final Condition c = lock.writeLock().newCondition();
850	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
851	>
852	>	thread.start();
853	>
854	>	while (!thread.lockStarted) {
855	>	Thread.sleep(100);
856	>	}
857	>
858	>	lock.writeLock().lock();
859	>	try {
860	>	thread.interrupt();
861	>	thread.canAwake = true;
862	>	c.signal();
863	>	} finally {
864	>	lock.writeLock().unlock();
865	>	}
866	>
867	>	thread.join();
868	>	assertTrue(thread.interrupted);
869	>	assertFalse(thread.isAlive());
870	>	}
871	>
872	>	/**
873	>	* await is interruptible
874	>	*/
875	>	public void testAwait_Interrupt() throws InterruptedException {
876	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
877	>	final Condition c = lock.writeLock().newCondition();
878	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
879	>	public void realRun() throws InterruptedException {
880	>	lock.writeLock().lock();
881	>	c.await();
882	>	lock.writeLock().unlock();
883	>	}});
884	>
885	>	t.start();
886	>	Thread.sleep(SHORT_DELAY_MS);
887	>	t.interrupt();
888	>	t.join(SHORT_DELAY_MS);
889	>	assertFalse(t.isAlive());
890	>	}
891	>
892	>	/**
893	>	* awaitNanos is interruptible
894	>	*/
895	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
896	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
897	>	final Condition c = lock.writeLock().newCondition();
898	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
899	>	public void realRun() throws InterruptedException {
900	>	lock.writeLock().lock();
901	>	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
902	>	lock.writeLock().unlock();
903	>	}});
904	>
905	>	t.start();
906	>	Thread.sleep(SHORT_DELAY_MS);
907	>	t.interrupt();
908	>	t.join(SHORT_DELAY_MS);
909	>	assertFalse(t.isAlive());
910	>	}
911	>
912	>	/**
913	>	* awaitUntil is interruptible
914	>	*/
915	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
916	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
917	>	final Condition c = lock.writeLock().newCondition();
918	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
919	>	public void realRun() throws InterruptedException {
920	>	lock.writeLock().lock();
921	>	java.util.Date d = new java.util.Date();
922	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
923	>	lock.writeLock().unlock();
924	>	}});
925	>
926	>	t.start();
927	>	Thread.sleep(SHORT_DELAY_MS);
928	>	t.interrupt();
929	>	t.join(SHORT_DELAY_MS);
930	>	assertFalse(t.isAlive());
931	>	}
932	>
933	>	/**
934	>	* signalAll wakes up all threads
935	>	*/
936	>	public void testSignalAll() throws InterruptedException {
937	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
938	>	final Condition c = lock.writeLock().newCondition();
939	>	Thread t1 = new Thread(new CheckedRunnable() {
940	>	public void realRun() throws InterruptedException {
941	>	lock.writeLock().lock();
942	>	c.await();
943	>	lock.writeLock().unlock();
944	>	}});
945	>
946	>	Thread t2 = new Thread(new CheckedRunnable() {
947	>	public void realRun() throws InterruptedException {
948	>	lock.writeLock().lock();
949	>	c.await();
950	>	lock.writeLock().unlock();
951	>	}});
952	>
953	>	t1.start();
954	>	t2.start();
955	>	Thread.sleep(SHORT_DELAY_MS);
956	>	lock.writeLock().lock();
957	>	c.signalAll();
958	>	lock.writeLock().unlock();
959	>	t1.join(SHORT_DELAY_MS);
960	>	t2.join(SHORT_DELAY_MS);
961	>	assertFalse(t1.isAlive());
962	>	assertFalse(t2.isAlive());
963	>	}
964	>
965	>	/**
966	>	* A serialized lock deserializes as unlocked
967	>	*/
968	>	public void testSerialization() throws Exception {
969	>	ReentrantReadWriteLock l = new ReentrantReadWriteLock();
970	>	l.readLock().lock();
971	>	l.readLock().unlock();
972	>
973	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
974	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
975	>	out.writeObject(l);
976	>	out.close();
977	>
978	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
979	>	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
980	>	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
981	>	r.readLock().lock();
982	>	r.readLock().unlock();
983	>	}
984	>
985	>	/**
986	>	* hasQueuedThreads reports whether there are waiting threads
987	>	*/
988	>	public void testhasQueuedThreads() throws InterruptedException {
989	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
990	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
991	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
992	>	assertFalse(lock.hasQueuedThreads());
993	>	lock.writeLock().lock();
994	>	t1.start();
995	>	Thread.sleep(SHORT_DELAY_MS);
996	>	assertTrue(lock.hasQueuedThreads());
997	>	t2.start();
998	>	Thread.sleep(SHORT_DELAY_MS);
999	>	assertTrue(lock.hasQueuedThreads());
1000	>	t1.interrupt();
1001	>	Thread.sleep(SHORT_DELAY_MS);
1002	>	assertTrue(lock.hasQueuedThreads());
1003	>	lock.writeLock().unlock();
1004	>	Thread.sleep(SHORT_DELAY_MS);
1005	>	assertFalse(lock.hasQueuedThreads());
1006	>	t1.join();
1007	>	t2.join();
1008	>	}
1009	>
1010	>	/**
1011	>	* hasQueuedThread(null) throws NPE
1012	>	*/
1013	>	public void testHasQueuedThreadNPE() {
1014	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1015	>	try {
1016	>	sync.hasQueuedThread(null);
1017	>	shouldThrow();
1018	>	} catch (NullPointerException success) {}
1019	>	}
1020	>
1021	>	/**
1022	>	* hasQueuedThread reports whether a thread is queued.
1023	>	*/
1024	>	public void testHasQueuedThread() throws InterruptedException {
1025	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1026	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1027	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1028	>	assertFalse(sync.hasQueuedThread(t1));
1029	>	assertFalse(sync.hasQueuedThread(t2));
1030	>	sync.writeLock().lock();
1031	>	t1.start();
1032	>	Thread.sleep(SHORT_DELAY_MS);
1033	>	assertTrue(sync.hasQueuedThread(t1));
1034	>	t2.start();
1035	>	Thread.sleep(SHORT_DELAY_MS);
1036	>	assertTrue(sync.hasQueuedThread(t1));
1037	>	assertTrue(sync.hasQueuedThread(t2));
1038	>	t1.interrupt();
1039	>	Thread.sleep(SHORT_DELAY_MS);
1040	>	assertFalse(sync.hasQueuedThread(t1));
1041	>	assertTrue(sync.hasQueuedThread(t2));
1042	>	sync.writeLock().unlock();
1043	>	Thread.sleep(SHORT_DELAY_MS);
1044	>	assertFalse(sync.hasQueuedThread(t1));
1045	>	Thread.sleep(SHORT_DELAY_MS);
1046	>	assertFalse(sync.hasQueuedThread(t2));
1047	>	t1.join();
1048	>	t2.join();
1049	>	}
1050	>
1051	>
1052	>	/**
1053	>	* getQueueLength reports number of waiting threads
1054	>	*/
1055	>	public void testGetQueueLength() throws InterruptedException {
1056	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1057	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1058	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1059	>	assertEquals(0, lock.getQueueLength());
1060	>	lock.writeLock().lock();
1061	>	t1.start();
1062	>	Thread.sleep(SHORT_DELAY_MS);
1063	>	assertEquals(1, lock.getQueueLength());
1064	>	t2.start();
1065	>	Thread.sleep(SHORT_DELAY_MS);
1066	>	assertEquals(2, lock.getQueueLength());
1067	>	t1.interrupt();
1068	>	Thread.sleep(SHORT_DELAY_MS);
1069	>	assertEquals(1, lock.getQueueLength());
1070	>	lock.writeLock().unlock();
1071	>	Thread.sleep(SHORT_DELAY_MS);
1072	>	assertEquals(0, lock.getQueueLength());
1073	>	t1.join();
1074	>	t2.join();
1075	>	}
1076	>
1077	>	/**
1078	>	* getQueuedThreads includes waiting threads
1079	>	*/
1080	>	public void testGetQueuedThreads() throws InterruptedException {
1081	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1082	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1083	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1084	>	assertTrue(lock.getQueuedThreads().isEmpty());
1085	>	lock.writeLock().lock();
1086	>	assertTrue(lock.getQueuedThreads().isEmpty());
1087	>	t1.start();
1088	>	Thread.sleep(SHORT_DELAY_MS);
1089	>	assertTrue(lock.getQueuedThreads().contains(t1));
1090	>	t2.start();
1091	>	Thread.sleep(SHORT_DELAY_MS);
1092	>	assertTrue(lock.getQueuedThreads().contains(t1));
1093	>	assertTrue(lock.getQueuedThreads().contains(t2));
1094	>	t1.interrupt();
1095	>	Thread.sleep(SHORT_DELAY_MS);
1096	>	assertFalse(lock.getQueuedThreads().contains(t1));
1097	>	assertTrue(lock.getQueuedThreads().contains(t2));
1098	>	lock.writeLock().unlock();
1099	>	Thread.sleep(SHORT_DELAY_MS);
1100	>	assertTrue(lock.getQueuedThreads().isEmpty());
1101	>	t1.join();
1102	>	t2.join();
1103	>	}
1104	>
1105	>	/**
1106	>	* hasWaiters throws NPE if null
1107	>	*/
1108	>	public void testHasWaitersNPE() {
1109	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1110	>	try {
1111	>	lock.hasWaiters(null);
1112	>	shouldThrow();
1113	>	} catch (NullPointerException success) {}
1114	>	}
1115	>
1116	>	/**
1117	>	* getWaitQueueLength throws NPE if null
1118	>	*/
1119	>	public void testGetWaitQueueLengthNPE() {
1120	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1121	>	try {
1122	>	lock.getWaitQueueLength(null);
1123	>	shouldThrow();
1124	>	} catch (NullPointerException success) {}
1125	>	}
1126	>
1127	>
1128	>	/**
1129	>	* getWaitingThreads throws NPE if null
1130	>	*/
1131	>	public void testGetWaitingThreadsNPE() {
1132	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1133	>	try {
1134	>	lock.getWaitingThreads(null);
1135	>	shouldThrow();
1136	>	} catch (NullPointerException success) {}
1137	>	}
1138	>
1139	>	/**
1140	>	* hasWaiters throws IAE if not owned
1141	>	*/
1142	>	public void testHasWaitersIAE() {
1143	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1144	>	final Condition c = lock.writeLock().newCondition();
1145	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1146	>	try {
1147	>	lock2.hasWaiters(c);
1148	>	shouldThrow();
1149	>	} catch (IllegalArgumentException success) {}
1150	>	}
1151	>
1152	>	/**
1153	>	* hasWaiters throws IMSE if not locked
1154	>	*/
1155	>	public void testHasWaitersIMSE() {
1156	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1157	>	final Condition c = lock.writeLock().newCondition();
1158	>	try {
1159	>	lock.hasWaiters(c);
1160	>	shouldThrow();
1161	>	} catch (IllegalMonitorStateException success) {}
1162	>	}
1163	>
1164	>
1165	>	/**
1166	>	* getWaitQueueLength throws IAE if not owned
1167	>	*/
1168	>	public void testGetWaitQueueLengthIAE() {
1169	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1170	>	final Condition c = lock.writeLock().newCondition();
1171	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1172	>	try {
1173	>	lock2.getWaitQueueLength(c);
1174	>	shouldThrow();
1175	>	} catch (IllegalArgumentException success) {}
1176	>	}
1177	>
1178	>	/**
1179	>	* getWaitQueueLength throws IMSE if not locked
1180	>	*/
1181	>	public void testGetWaitQueueLengthIMSE() {
1182	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1183	>	final Condition c = lock.writeLock().newCondition();
1184	>	try {
1185	>	lock.getWaitQueueLength(c);
1186	>	shouldThrow();
1187	>	} catch (IllegalMonitorStateException success) {}
1188	>	}
1189	>
1190	>
1191	>	/**
1192	>	* getWaitingThreads throws IAE if not owned
1193	>	*/
1194	>	public void testGetWaitingThreadsIAE() {
1195	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1196	>	final Condition c = lock.writeLock().newCondition();
1197	>	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1198	>	try {
1199	>	lock2.getWaitingThreads(c);
1200	>	shouldThrow();
1201	>	} catch (IllegalArgumentException success) {}
1202	>	}
1203	>
1204	>	/**
1205	>	* getWaitingThreads throws IMSE if not locked
1206	>	*/
1207	>	public void testGetWaitingThreadsIMSE() {
1208	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1209	>	final Condition c = lock.writeLock().newCondition();
1210	>	try {
1211	>	lock.getWaitingThreads(c);
1212	>	shouldThrow();
1213	>	} catch (IllegalMonitorStateException success) {}
1214	>	}
1215	>
1216	>
1217	>	/**
1218	>	* hasWaiters returns true when a thread is waiting, else false
1219	>	*/
1220	>	public void testHasWaiters() throws InterruptedException {
1221	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1222	>	final Condition c = lock.writeLock().newCondition();
1223	>	Thread t = new Thread(new CheckedRunnable() {
1224	>	public void realRun() throws InterruptedException {
1225	>	lock.writeLock().lock();
1226	>	threadAssertFalse(lock.hasWaiters(c));
1227	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1228	>	c.await();
1229	>	lock.writeLock().unlock();
1230	>	}});
1231	>
1232	>	t.start();
1233	>	Thread.sleep(SHORT_DELAY_MS);
1234	>	lock.writeLock().lock();
1235	>	assertTrue(lock.hasWaiters(c));
1236	>	assertEquals(1, lock.getWaitQueueLength(c));
1237	>	c.signal();
1238	>	lock.writeLock().unlock();
1239	>	Thread.sleep(SHORT_DELAY_MS);
1240	>	lock.writeLock().lock();
1241	>	assertFalse(lock.hasWaiters(c));
1242	>	assertEquals(0, lock.getWaitQueueLength(c));
1243	>	lock.writeLock().unlock();
1244	>	t.join(SHORT_DELAY_MS);
1245	>	assertFalse(t.isAlive());
1246	>	}
1247	>
1248	>	/**
1249	>	* getWaitQueueLength returns number of waiting threads
1250	>	*/
1251	>	public void testGetWaitQueueLength() throws InterruptedException {
1252	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1253	>	final Condition c = lock.writeLock().newCondition();
1254	>	Thread t = new Thread(new CheckedRunnable() {
1255	>	public void realRun() throws InterruptedException {
1256	>	lock.writeLock().lock();
1257	>	threadAssertFalse(lock.hasWaiters(c));
1258	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1259	>	c.await();
1260	>	lock.writeLock().unlock();
1261	>	}});
1262	>
1263	>	t.start();
1264	>	Thread.sleep(SHORT_DELAY_MS);
1265	>	lock.writeLock().lock();
1266	>	assertTrue(lock.hasWaiters(c));
1267	>	assertEquals(1, lock.getWaitQueueLength(c));
1268	>	c.signal();
1269	>	lock.writeLock().unlock();
1270	>	Thread.sleep(SHORT_DELAY_MS);
1271	>	lock.writeLock().lock();
1272	>	assertFalse(lock.hasWaiters(c));
1273	>	assertEquals(0, lock.getWaitQueueLength(c));
1274	>	lock.writeLock().unlock();
1275	>	t.join(SHORT_DELAY_MS);
1276	>	assertFalse(t.isAlive());
1277	>	}
1278	>
1279	>
1280	>	/**
1281	>	* getWaitingThreads returns only and all waiting threads
1282	>	*/
1283	>	public void testGetWaitingThreads() throws InterruptedException {
1284	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1285	>	final Condition c = lock.writeLock().newCondition();
1286	>	Thread t1 = new Thread(new CheckedRunnable() {
1287	>	public void realRun() throws InterruptedException {
1288	>	lock.writeLock().lock();
1289	>	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1290	>	c.await();
1291	>	lock.writeLock().unlock();
1292	>	}});
1293	>
1294	>	Thread t2 = new Thread(new CheckedRunnable() {
1295	>	public void realRun() throws InterruptedException {
1296	>	lock.writeLock().lock();
1297	>	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1298	>	c.await();
1299	>	lock.writeLock().unlock();
1300	>	}});
1301	>
1302	>	lock.writeLock().lock();
1303	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1304	>	lock.writeLock().unlock();
1305	>	t1.start();
1306	>	Thread.sleep(SHORT_DELAY_MS);
1307	>	t2.start();
1308	>	Thread.sleep(SHORT_DELAY_MS);
1309	>	lock.writeLock().lock();
1310	>	assertTrue(lock.hasWaiters(c));
1311	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
1312	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
1313	>	c.signalAll();
1314	>	lock.writeLock().unlock();
1315	>	Thread.sleep(SHORT_DELAY_MS);
1316	>	lock.writeLock().lock();
1317	>	assertFalse(lock.hasWaiters(c));
1318	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1319	>	lock.writeLock().unlock();
1320	>	t1.join(SHORT_DELAY_MS);
1321	>	t2.join(SHORT_DELAY_MS);
1322	>	assertFalse(t1.isAlive());
1323	>	assertFalse(t2.isAlive());
1324	>	}
1325	>
1326	>	/**
1327	>	* toString indicates current lock state
1328	>	*/
1329	>	public void testToString() {
1330	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1331	>	String us = lock.toString();
1332	>	assertTrue(us.indexOf("Write locks = 0") >= 0);
1333	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1334	>	lock.writeLock().lock();
1335	>	String ws = lock.toString();
1336	>	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1337	>	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1338	>	lock.writeLock().unlock();
1339	>	lock.readLock().lock();
1340	>	lock.readLock().lock();
1341	>	String rs = lock.toString();
1342	>	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1343	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1344	>	}
1345	>
1346	>	/**
1347	>	* readLock.toString indicates current lock state
1348	>	*/
1349	>	public void testReadLockToString() {
1350	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1351	>	String us = lock.readLock().toString();
1352	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1353	>	lock.readLock().lock();
1354	>	lock.readLock().lock();
1355	>	String rs = lock.readLock().toString();
1356	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1357	>	}
1358	>
1359	>	/**
1360	>	* writeLock.toString indicates current lock state
1361	>	*/
1362	>	public void testWriteLockToString() {
1363	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1364	>	String us = lock.writeLock().toString();
1365	>	assertTrue(us.indexOf("Unlocked") >= 0);
1366	>	lock.writeLock().lock();
1367	>	String ls = lock.writeLock().toString();
1368	>	assertTrue(ls.indexOf("Locked") >= 0);
1369		}
112	–
1370
1371		}

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