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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 1.33 by jsr166, Tue Nov 17 14:33:55 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 java.io.*;
13	+	import java.util.*;
14
15	<	public class ReentrantReadWriteLockTest extends TestCase {
13	<	static int HOLD_COUNT_TEST_LIMIT = 20;
14	<
15	>	public class ReentrantReadWriteLockTest extends JSR166TestCase {
16		public static void main(String[] args) {
17	<	junit.textui.TestRunner.run (suite());
17	>	junit.textui.TestRunner.run (suite());
18		}
18	–
19		public static Test suite() {
20		return new TestSuite(ReentrantReadWriteLockTest.class);
21		}
22
23	+	/**
24	+	* A runnable calling lockInterruptibly
25	+	*/
26	+	class InterruptibleLockRunnable extends CheckedRunnable {
27	+	final ReentrantReadWriteLock lock;
28	+	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
29	+	public void realRun() throws InterruptedException {
30	+	lock.writeLock().lockInterruptibly();
31	+	}
32	+	}
33	+
34	+
35	+	/**
36	+	* A runnable calling lockInterruptibly that expects to be
37	+	* interrupted
38	+	*/
39	+	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
40	+	final ReentrantReadWriteLock lock;
41	+	InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
42	+	public void realRun() throws InterruptedException {
43	+	lock.writeLock().lockInterruptibly();
44	+	}
45	+	}
46
47	<	private static long SHORT_DELAY_MS = 100;
48	<	private static long MEDIUM_DELAY_MS = 1000;
26	<	private static long LONG_DELAY_MS = 10000;
27	<
28	<	/*
29	<	* Unlocks an unlocked lock, throws Illegal Monitor State
30	<	*
47	>	/**
48	>	* Subclass to expose protected methods
49		*/
50	<
51	<	public void testIllegalMonitorStateException(){
50	>	static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
51	>	PublicReentrantReadWriteLock() { super(); }
52	>	public Collection<Thread> getQueuedThreads() {
53	>	return super.getQueuedThreads();
54	>	}
55	>	public Collection<Thread> getWaitingThreads(Condition c) {
56	>	return super.getWaitingThreads(c);
57	>	}
58	>	}
59	>
60	>	/**
61	>	* Constructor sets given fairness, and is in unlocked state
62	>	*/
63	>	public void testConstructor() {
64		ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
65	<	try{
65	>	assertFalse(rl.isFair());
66	>	assertFalse(rl.isWriteLocked());
67	>	assertEquals(0, rl.getReadLockCount());
68	>	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
69	>	assertTrue(r2.isFair());
70	>	assertFalse(r2.isWriteLocked());
71	>	assertEquals(0, r2.getReadLockCount());
72	>	ReentrantReadWriteLock r3 = new ReentrantReadWriteLock(false);
73	>	assertFalse(r3.isFair());
74	>	assertFalse(r3.isWriteLocked());
75	>	assertEquals(0, r3.getReadLockCount());
76	>	}
77	>
78	>	/**
79	>	* write-locking and read-locking an unlocked lock succeed
80	>	*/
81	>	public void testLock() {
82	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
83	>	rl.writeLock().lock();
84	>	assertTrue(rl.isWriteLocked());
85	>	assertTrue(rl.isWriteLockedByCurrentThread());
86	>	assertTrue(rl.writeLock().isHeldByCurrentThread());
87	>	assertEquals(0, rl.getReadLockCount());
88	>	rl.writeLock().unlock();
89	>	assertFalse(rl.isWriteLocked());
90	>	assertFalse(rl.isWriteLockedByCurrentThread());
91	>	assertFalse(rl.writeLock().isHeldByCurrentThread());
92	>	assertEquals(0, rl.getReadLockCount());
93	>	rl.readLock().lock();
94	>	assertFalse(rl.isWriteLocked());
95	>	assertFalse(rl.isWriteLockedByCurrentThread());
96	>	assertEquals(1, rl.getReadLockCount());
97	>	rl.readLock().unlock();
98	>	assertFalse(rl.isWriteLocked());
99	>	assertFalse(rl.isWriteLockedByCurrentThread());
100	>	assertEquals(0, rl.getReadLockCount());
101	>	}
102	>
103	>
104	>	/**
105	>	* locking an unlocked fair lock succeeds
106	>	*/
107	>	public void testFairLock() {
108	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
109	>	rl.writeLock().lock();
110	>	assertTrue(rl.isWriteLocked());
111	>	assertTrue(rl.isWriteLockedByCurrentThread());
112	>	assertTrue(rl.writeLock().isHeldByCurrentThread());
113	>	assertEquals(0, rl.getReadLockCount());
114	>	rl.writeLock().unlock();
115	>	assertFalse(rl.isWriteLocked());
116	>	assertFalse(rl.isWriteLockedByCurrentThread());
117	>	assertFalse(rl.writeLock().isHeldByCurrentThread());
118	>	assertEquals(0, rl.getReadLockCount());
119	>	rl.readLock().lock();
120	>	assertFalse(rl.isWriteLocked());
121	>	assertFalse(rl.isWriteLockedByCurrentThread());
122	>	assertEquals(1, rl.getReadLockCount());
123	>	rl.readLock().unlock();
124	>	assertFalse(rl.isWriteLocked());
125	>	assertFalse(rl.isWriteLockedByCurrentThread());
126	>	assertEquals(0, rl.getReadLockCount());
127	>	}
128	>
129	>	/**
130	>	* getWriteHoldCount returns number of recursive holds
131	>	*/
132	>	public void testGetWriteHoldCount() {
133	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
134	>	for (int i = 1; i <= SIZE; i++) {
135	>	lock.writeLock().lock();
136	>	assertEquals(i,lock.getWriteHoldCount());
137	>	}
138	>	for (int i = SIZE; i > 0; i--) {
139	>	lock.writeLock().unlock();
140	>	assertEquals(i-1,lock.getWriteHoldCount());
141	>	}
142	>	}
143	>
144	>	/**
145	>	* WriteLock.getHoldCount returns number of recursive holds
146	>	*/
147	>	public void testGetHoldCount() {
148	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
149	>	for (int i = 1; i <= SIZE; i++) {
150	>	lock.writeLock().lock();
151	>	assertEquals(i,lock.writeLock().getHoldCount());
152	>	}
153	>	for (int i = SIZE; i > 0; i--) {
154	>	lock.writeLock().unlock();
155	>	assertEquals(i-1,lock.writeLock().getHoldCount());
156	>	}
157	>	}
158	>
159	>	/**
160	>	* getReadHoldCount returns number of recursive holds
161	>	*/
162	>	public void testGetReadHoldCount() {
163	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
164	>	for (int i = 1; i <= SIZE; i++) {
165	>	lock.readLock().lock();
166	>	assertEquals(i,lock.getReadHoldCount());
167	>	}
168	>	for (int i = SIZE; i > 0; i--) {
169	>	lock.readLock().unlock();
170	>	assertEquals(i-1,lock.getReadHoldCount());
171	>	}
172	>	}
173	>
174	>
175	>	/**
176	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
177	>	*/
178	>	public void testUnlock_IllegalMonitorStateException() {
179	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
180	>	try {
181		rl.writeLock().unlock();
182	<	fail("Should of thown Illegal Monitor State Exception");
182	>	shouldThrow();
183	>	} catch (IllegalMonitorStateException success) {}
184	>	}
185
39	–	}catch(IllegalMonitorStateException sucess){}
186
187	+	/**
188	+	* write-lockInterruptibly is interruptible
189	+	*/
190	+	public void testWriteLockInterruptibly_Interrupted() throws Exception {
191	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
192	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
193	+	public void realRun() throws InterruptedException {
194	+	lock.writeLock().lockInterruptibly();
195	+	lock.writeLock().unlock();
196	+	lock.writeLock().lockInterruptibly();
197	+	lock.writeLock().unlock();
198	+	}});
199
200	+	lock.writeLock().lock();
201	+	t.start();
202	+	Thread.sleep(SHORT_DELAY_MS);
203	+	t.interrupt();
204	+	Thread.sleep(SHORT_DELAY_MS);
205	+	lock.writeLock().unlock();
206	+	t.join();
207		}
208	<
209	<	/*
210	<	* makes a lock, locks it, tries to aquire the lock in another thread
46	<	* interrupts that thread and waits for an interrupted Exception to
47	<	* be thrown.
208	>
209	>	/**
210	>	* timed write-tryLock is interruptible
211		*/
212	+	public void testWriteTryLock_Interrupted() throws InterruptedException {
213	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
214	+	lock.writeLock().lock();
215	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
216	+	public void realRun() throws InterruptedException {
217	+	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
218	+	}});
219
220	<	public void testInterruptedException(){
220	>	t.start();
221	>	t.interrupt();
222	>	lock.writeLock().unlock();
223	>	t.join();
224	>	}
225	>
226	>	/**
227	>	* read-lockInterruptibly is interruptible
228	>	*/
229	>	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
230		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
231		lock.writeLock().lock();
232	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
233	+	public void realRun() throws InterruptedException {
234	+	lock.readLock().lockInterruptibly();
235	+	}});
236	+
237	+	t.start();
238	+	Thread.sleep(SHORT_DELAY_MS);
239	+	t.interrupt();
240	+	Thread.sleep(SHORT_DELAY_MS);
241	+	lock.writeLock().unlock();
242	+	t.join();
243	+	}
244	+
245	+	/**
246	+	* timed read-tryLock is interruptible
247	+	*/
248	+	public void testReadTryLock_Interrupted() throws InterruptedException {
249	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
250	+	lock.writeLock().lock();
251	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
252	+	public void realRun() throws InterruptedException {
253	+	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
254	+	}});
255	+
256	+	t.start();
257	+	t.interrupt();
258	+	t.join();
259	+	}
260	+
261	+
262	+	/**
263	+	* write-tryLock fails if locked
264	+	*/
265	+	public void testWriteTryLockWhenLocked() throws InterruptedException {
266	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
267	+	lock.writeLock().lock();
268	+	Thread t = new Thread(new Runnable() {
269	+	public void run() {
270	+	threadAssertFalse(lock.writeLock().tryLock());
271	+	}
272	+	});
273	+
274	+	t.start();
275	+	t.join();
276	+	lock.writeLock().unlock();
277	+	}
278	+
279	+	/**
280	+	* read-tryLock fails if locked
281	+	*/
282	+	public void testReadTryLockWhenLocked() throws InterruptedException {
283	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
284	+	lock.writeLock().lock();
285	+	Thread t = new Thread(new Runnable() {
286	+	public void run() {
287	+	threadAssertFalse(lock.readLock().tryLock());
288	+	}
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 Runnable() {
303	<	public void run(){
304	<	try{
305	<	lock.writeLock().lockInterruptibly();
57	<	fail("should throw");
58	<	}catch(InterruptedException sucess){}
303	>	public void run() {
304	>	threadAssertTrue(lock.readLock().tryLock());
305	>	lock.readLock().unlock();
306		}
307		});
61	–	t.start();
62	–	t.interrupt();
63	–	lock.writeLock().unlock();
64	–	}
308
309	<	/*
310	<	* tests for interrupted exception on a timed wait
311	<	*
309	>	t.start();
310	>	t.join();
311	>	lock.readLock().unlock();
312	>	}
313	>
314	>	/**
315	>	* A writelock succeeds after reading threads unlock
316		*/
317	<
317	>	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
318	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
319	>	lock.readLock().lock();
320	>	Thread t1 = new Thread(new Runnable() {
321	>	public void run() {
322	>	lock.readLock().lock();
323	>	lock.readLock().unlock();
324	>	}
325	>	});
326	>	Thread t2 = new Thread(new Runnable() {
327	>	public void run() {
328	>	lock.writeLock().lock();
329	>	lock.writeLock().unlock();
330	>	}
331	>	});
332	>
333	>	t1.start();
334	>	t2.start();
335	>	Thread.sleep(SHORT_DELAY_MS);
336	>	lock.readLock().unlock();
337	>	t1.join(MEDIUM_DELAY_MS);
338	>	t2.join(MEDIUM_DELAY_MS);
339	>	assertTrue(!t1.isAlive());
340	>	assertTrue(!t2.isAlive());
341	>	}
342
343	<	public void testInterruptedException2(){
343	>	/**
344	>	* Readlocks succeed after a writing thread unlocks
345	>	*/
346	>	public void testReadAfterWriteLock() throws InterruptedException {
347		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
348		lock.writeLock().lock();
349	+	Thread t1 = new Thread(new Runnable() {
350	+	public void run() {
351	+	lock.readLock().lock();
352	+	lock.readLock().unlock();
353	+	}
354	+	});
355	+	Thread t2 = new Thread(new Runnable() {
356	+	public void run() {
357	+	lock.readLock().lock();
358	+	lock.readLock().unlock();
359	+	}
360	+	});
361	+
362	+	t1.start();
363	+	t2.start();
364	+	Thread.sleep(SHORT_DELAY_MS);
365	+	lock.writeLock().unlock();
366	+	t1.join(MEDIUM_DELAY_MS);
367	+	t2.join(MEDIUM_DELAY_MS);
368	+	assertTrue(!t1.isAlive());
369	+	assertTrue(!t2.isAlive());
370	+	}
371	+
372	+	/**
373	+	* Read trylock succeeds if write locked by current thread
374	+	*/
375	+	public void testReadHoldingWriteLock() {
376	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
377	+	lock.writeLock().lock();
378	+	assertTrue(lock.readLock().tryLock());
379	+	lock.readLock().unlock();
380	+	lock.writeLock().unlock();
381	+	}
382	+
383	+	/**
384	+	* Read lock succeeds if write locked by current thread even if
385	+	* other threads are waiting for readlock
386	+	*/
387	+	public void testReadHoldingWriteLock2() throws InterruptedException {
388	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
389	+	lock.writeLock().lock();
390	+	Thread t1 = new Thread(new Runnable() {
391	+	public void run() {
392	+	lock.readLock().lock();
393	+	lock.readLock().unlock();
394	+	}
395	+	});
396	+	Thread t2 = new Thread(new Runnable() {
397	+	public void run() {
398	+	lock.readLock().lock();
399	+	lock.readLock().unlock();
400	+	}
401	+	});
402	+
403	+	t1.start();
404	+	t2.start();
405	+	lock.readLock().lock();
406	+	lock.readLock().unlock();
407	+	Thread.sleep(SHORT_DELAY_MS);
408	+	lock.readLock().lock();
409	+	lock.readLock().unlock();
410	+	lock.writeLock().unlock();
411	+	t1.join(MEDIUM_DELAY_MS);
412	+	t2.join(MEDIUM_DELAY_MS);
413	+	assertTrue(!t1.isAlive());
414	+	assertTrue(!t2.isAlive());
415	+	}
416	+
417	+	/**
418	+	*  Read lock succeeds if write locked by current thread even if
419	+	* other threads are waiting for writelock
420	+	*/
421	+	public void testReadHoldingWriteLock3() throws InterruptedException {
422	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
423	+	lock.writeLock().lock();
424	+	Thread t1 = new Thread(new Runnable() {
425	+	public void run() {
426	+	lock.writeLock().lock();
427	+	lock.writeLock().unlock();
428	+	}
429	+	});
430	+	Thread t2 = new Thread(new Runnable() {
431	+	public void run() {
432	+	lock.writeLock().lock();
433	+	lock.writeLock().unlock();
434	+	}
435	+	});
436	+
437	+	t1.start();
438	+	t2.start();
439	+	lock.readLock().lock();
440	+	lock.readLock().unlock();
441	+	Thread.sleep(SHORT_DELAY_MS);
442	+	lock.readLock().lock();
443	+	lock.readLock().unlock();
444	+	lock.writeLock().unlock();
445	+	t1.join(MEDIUM_DELAY_MS);
446	+	t2.join(MEDIUM_DELAY_MS);
447	+	assertTrue(!t1.isAlive());
448	+	assertTrue(!t2.isAlive());
449	+	}
450	+
451	+
452	+	/**
453	+	*  Write lock succeeds if write locked by current thread even if
454	+	* other threads are waiting for writelock
455	+	*/
456	+	public void testWriteHoldingWriteLock4() throws InterruptedException {
457	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
458	+	lock.writeLock().lock();
459	+	Thread t1 = new Thread(new Runnable() {
460	+	public void run() {
461	+	lock.writeLock().lock();
462	+	lock.writeLock().unlock();
463	+	}
464	+	});
465	+	Thread t2 = new Thread(new Runnable() {
466	+	public void run() {
467	+	lock.writeLock().lock();
468	+	lock.writeLock().unlock();
469	+	}
470	+	});
471	+
472	+	t1.start();
473	+	t2.start();
474	+	lock.writeLock().lock();
475	+	lock.writeLock().unlock();
476	+	Thread.sleep(SHORT_DELAY_MS);
477	+	lock.writeLock().lock();
478	+	lock.writeLock().unlock();
479	+	lock.writeLock().unlock();
480	+	t1.join(MEDIUM_DELAY_MS);
481	+	t2.join(MEDIUM_DELAY_MS);
482	+	assertTrue(!t1.isAlive());
483	+	assertTrue(!t2.isAlive());
484	+	}
485	+
486	+
487	+	/**
488	+	* Fair Read trylock succeeds if write locked by current thread
489	+	*/
490	+	public void testReadHoldingWriteLockFair() {
491	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
492	+	lock.writeLock().lock();
493	+	assertTrue(lock.readLock().tryLock());
494	+	lock.readLock().unlock();
495	+	lock.writeLock().unlock();
496	+	}
497	+
498	+	/**
499	+	* Fair Read lock succeeds if write locked by current thread even if
500	+	* other threads are waiting for readlock
501	+	*/
502	+	public void testReadHoldingWriteLockFair2() throws InterruptedException {
503	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
504	+	lock.writeLock().lock();
505	+	Thread t1 = new Thread(new Runnable() {
506	+	public void run() {
507	+	lock.readLock().lock();
508	+	lock.readLock().unlock();
509	+	}
510	+	});
511	+	Thread t2 = new Thread(new Runnable() {
512	+	public void run() {
513	+	lock.readLock().lock();
514	+	lock.readLock().unlock();
515	+	}
516	+	});
517	+
518	+	t1.start();
519	+	t2.start();
520	+	lock.readLock().lock();
521	+	lock.readLock().unlock();
522	+	Thread.sleep(SHORT_DELAY_MS);
523	+	lock.readLock().lock();
524	+	lock.readLock().unlock();
525	+	lock.writeLock().unlock();
526	+	t1.join(MEDIUM_DELAY_MS);
527	+	t2.join(MEDIUM_DELAY_MS);
528	+	assertTrue(!t1.isAlive());
529	+	assertTrue(!t2.isAlive());
530	+	}
531	+
532	+
533	+	/**
534	+	* Fair Read lock succeeds if write locked by current thread even if
535	+	* other threads are waiting for writelock
536	+	*/
537	+	public void testReadHoldingWriteLockFair3() throws InterruptedException {
538	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
539	+	lock.writeLock().lock();
540	+	Thread t1 = new Thread(new Runnable() {
541	+	public void run() {
542	+	lock.writeLock().lock();
543	+	lock.writeLock().unlock();
544	+	}
545	+	});
546	+	Thread t2 = new Thread(new Runnable() {
547	+	public void run() {
548	+	lock.writeLock().lock();
549	+	lock.writeLock().unlock();
550	+	}
551	+	});
552	+
553	+	t1.start();
554	+	t2.start();
555	+	lock.readLock().lock();
556	+	lock.readLock().unlock();
557	+	Thread.sleep(SHORT_DELAY_MS);
558	+	lock.readLock().lock();
559	+	lock.readLock().unlock();
560	+	lock.writeLock().unlock();
561	+	t1.join(MEDIUM_DELAY_MS);
562	+	t2.join(MEDIUM_DELAY_MS);
563	+	assertTrue(!t1.isAlive());
564	+	assertTrue(!t2.isAlive());
565	+	}
566	+
567	+
568	+	/**
569	+	* Fair Write lock succeeds if write locked by current thread even if
570	+	* other threads are waiting for writelock
571	+	*/
572	+	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
573	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
574	+	lock.writeLock().lock();
575	+	Thread t1 = new Thread(new Runnable() {
576	+	public void run() {
577	+	lock.writeLock().lock();
578	+	lock.writeLock().unlock();
579	+	}
580	+	});
581	+	Thread t2 = new Thread(new Runnable() {
582	+	public void run() {
583	+	lock.writeLock().lock();
584	+	lock.writeLock().unlock();
585	+	}
586	+	});
587	+
588	+	t1.start();
589	+	t2.start();
590	+	Thread.sleep(SHORT_DELAY_MS);
591	+	assertTrue(lock.isWriteLockedByCurrentThread());
592	+	assertTrue(lock.getWriteHoldCount() == 1);
593	+	lock.writeLock().lock();
594	+	assertTrue(lock.getWriteHoldCount() == 2);
595	+	lock.writeLock().unlock();
596	+	lock.writeLock().lock();
597	+	lock.writeLock().unlock();
598	+	lock.writeLock().unlock();
599	+	t1.join(MEDIUM_DELAY_MS);
600	+	t2.join(MEDIUM_DELAY_MS);
601	+	assertTrue(!t1.isAlive());
602	+	assertTrue(!t2.isAlive());
603	+	}
604	+
605	+
606	+	/**
607	+	* Read tryLock succeeds if readlocked but not writelocked
608	+	*/
609	+	public void testTryLockWhenReadLocked() throws InterruptedException {
610	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
611	+	lock.readLock().lock();
612		Thread t = new Thread(new Runnable() {
613	<	public void run(){
614	<	try{
615	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
79	<	fail("should throw");
80	<	}catch(InterruptedException sucess){}
613	>	public void run() {
614	>	threadAssertTrue(lock.readLock().tryLock());
615	>	lock.readLock().unlock();
616		}
617		});
618	<	t.start();
619	<	t.interrupt();
618	>
619	>	t.start();
620	>	t.join();
621	>	lock.readLock().unlock();
622		}
623
87	–
624
625	<	/*
626	<	* current thread locks interruptibly the thread
627	<	* another thread tries to aquire the lock and blocks
92	<	* on the call. interrupt the attempted aquireLock
93	<	* assert that the first lock() call actually locked the lock
94	<	* assert that the current thread is the one holding the lock
625	>
626	>	/**
627	>	* write tryLock fails when readlocked
628		*/
629	+	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
630	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
631	+	lock.readLock().lock();
632	+	Thread t = new Thread(new Runnable() {
633	+	public void run() {
634	+	threadAssertFalse(lock.writeLock().tryLock());
635	+	}
636	+	});
637
638	<	public void testLockedInterruptibly() {
639	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
640	<	try {lock.writeLock().lockInterruptibly();} catch(Exception e) {}
641	<	Thread t = new Thread(new Runnable() {
642	<	public void run() {
643	<	try {
644	<	lock.writeLock().lockInterruptibly();
645	<	fail("Failed to generate an Interrupted Exception");
646	<	}
647	<	catch(InterruptedException e) {}
638	>	t.start();
639	>	t.join();
640	>	lock.readLock().unlock();
641	>	}
642	>
643	>
644	>	/**
645	>	* Fair Read tryLock succeeds if readlocked but not writelocked
646	>	*/
647	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
648	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
649	>	lock.readLock().lock();
650	>	Thread t = new Thread(new Runnable() {
651	>	public void run() {
652	>	threadAssertTrue(lock.readLock().tryLock());
653	>	lock.readLock().unlock();
654		}
655		});
656	<	t.start();
657	<	t.interrupt();
656	>
657	>	t.start();
658	>	t.join();
659	>	lock.readLock().unlock();
660	>	}
661	>
662	>
663	>
664	>	/**
665	>	* Fair write tryLock fails when readlocked
666	>	*/
667	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
668	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
669	>	lock.readLock().lock();
670	>	Thread t = new Thread(new Runnable() {
671	>	public void run() {
672	>	threadAssertFalse(lock.writeLock().tryLock());
673	>	}
674	>	});
675	>
676	>	t.start();
677	>	t.join();
678	>	lock.readLock().unlock();
679	>	}
680	>
681	>
682	>
683	>	/**
684	>	* write timed tryLock times out if locked
685	>	*/
686	>	public void testWriteTryLock_Timeout() throws InterruptedException {
687	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
688	>	lock.writeLock().lock();
689	>	Thread t = new Thread(new CheckedRunnable() {
690	>	public void realRun() throws InterruptedException {
691	>	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
692	>	}});
693	>
694	>	t.start();
695	>	t.join();
696	>	lock.writeLock().unlock();
697	>	}
698	>
699	>	/**
700	>	* read timed tryLock times out if write-locked
701	>	*/
702	>	public void testReadTryLock_Timeout() throws InterruptedException {
703	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
704	>	lock.writeLock().lock();
705	>	Thread t = new Thread(new CheckedRunnable() {
706	>	public void realRun() throws InterruptedException {
707	>	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
708	>	}});
709	>
710	>	t.start();
711	>	t.join();
712	>	lock.writeLock().unlock();
713	>	}
714	>
715	>
716	>	/**
717	>	* write lockInterruptibly succeeds if lock free else is interruptible
718	>	*/
719	>	public void testWriteLockInterruptibly() 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.writeLock().lockInterruptibly();
725	>	}});
726	>
727	>	t.start();
728	>	Thread.sleep(SHORT_DELAY_MS);
729	>	t.interrupt();
730	>	Thread.sleep(SHORT_DELAY_MS);
731	>	t.join();
732	>	lock.writeLock().unlock();
733	>	}
734	>
735	>	/**
736	>	*  read lockInterruptibly succeeds if lock free else is interruptible
737	>	*/
738	>	public void testReadLockInterruptibly() throws InterruptedException {
739	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
740	>	lock.writeLock().lockInterruptibly();
741	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
742	>	public void realRun() throws InterruptedException {
743	>	lock.readLock().lockInterruptibly();
744	>	}});
745	>
746	>	t.start();
747	>	Thread.sleep(SHORT_DELAY_MS);
748	>	t.interrupt();
749	>	t.join();
750	>	lock.writeLock().unlock();
751	>	}
752	>
753	>	/**
754	>	* Calling await without holding lock throws IllegalMonitorStateException
755	>	*/
756	>	public void testAwait_IllegalMonitor() throws InterruptedException {
757	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
758	>	final Condition c = lock.writeLock().newCondition();
759	>	try {
760	>	c.await();
761	>	shouldThrow();
762	>	} catch (IllegalMonitorStateException success) {}
763	>	}
764	>
765	>	/**
766	>	* Calling signal without holding lock throws IllegalMonitorStateException
767	>	*/
768	>	public void testSignal_IllegalMonitor() {
769	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
770	>	final Condition c = lock.writeLock().newCondition();
771	>	try {
772	>	c.signal();
773	>	shouldThrow();
774	>	} catch (IllegalMonitorStateException success) {}
775	>	}
776	>
777	>	/**
778	>	* awaitNanos without a signal times out
779	>	*/
780	>	public void testAwaitNanos_Timeout() throws InterruptedException {
781	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
782	>	final Condition c = lock.writeLock().newCondition();
783	>
784	>	lock.writeLock().lock();
785	>	long t = c.awaitNanos(100);
786	>	assertTrue(t <= 0);
787	>	lock.writeLock().unlock();
788	>	}
789	>
790	>
791	>	/**
792	>	*  timed await without a signal times out
793	>	*/
794	>	public void testAwait_Timeout() {
795	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
796	>	final Condition c = lock.writeLock().newCondition();
797	>	lock.writeLock().lock();
798	>	lock.writeLock().unlock();
799	>	}
800	>
801	>	/**
802	>	* awaitUntil without a signal times out
803	>	*/
804	>	public void testAwaitUntil_Timeout() {
805	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
806	>	final Condition c = lock.writeLock().newCondition();
807	>	lock.writeLock().lock();
808	>	java.util.Date d = new java.util.Date();
809	>	lock.writeLock().unlock();
810	>	}
811	>
812	>	/**
813	>	* await returns when signalled
814	>	*/
815	>	public void testAwait() throws InterruptedException {
816	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
817	>	final Condition c = lock.writeLock().newCondition();
818	>	Thread t = new Thread(new CheckedRunnable() {
819	>	public void realRun() throws InterruptedException {
820	>	lock.writeLock().lock();
821	>	c.await();
822	>	lock.writeLock().unlock();
823	>	}});
824	>
825	>	t.start();
826	>	Thread.sleep(SHORT_DELAY_MS);
827	>	lock.writeLock().lock();
828	>	c.signal();
829	>	lock.writeLock().unlock();
830	>	t.join(SHORT_DELAY_MS);
831	>	assertFalse(t.isAlive());
832	>	}
833	>
834	>	/** A helper class for uninterruptible wait tests */
835	>	class UninterruptableThread extends Thread {
836	>	private Lock lock;
837	>	private Condition c;
838	>
839	>	public volatile boolean canAwake = false;
840	>	public volatile boolean interrupted = false;
841	>	public volatile boolean lockStarted = false;
842	>
843	>	public UninterruptableThread(Lock lock, Condition c) {
844	>	this.lock = lock;
845	>	this.c = c;
846	>	}
847	>
848	>	public synchronized void run() {
849	>	lock.lock();
850	>	lockStarted = true;
851	>
852	>	while (!canAwake) {
853	>	c.awaitUninterruptibly();
854	>	}
855	>
856	>	interrupted = isInterrupted();
857	>	lock.unlock();
858	>	}
859	>	}
860	>
861	>	/**
862	>	* awaitUninterruptibly doesn't abort on interrupt
863	>	*/
864	>	public void testAwaitUninterruptibly() throws InterruptedException {
865	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
866	>	final Condition c = lock.writeLock().newCondition();
867	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
868	>
869	>	thread.start();
870	>
871	>	while (!thread.lockStarted) {
872	>	Thread.sleep(100);
873	>	}
874	>
875	>	lock.writeLock().lock();
876	>	try {
877	>	thread.interrupt();
878	>	thread.canAwake = true;
879	>	c.signal();
880	>	} finally {
881	>	lock.writeLock().unlock();
882	>	}
883	>
884	>	thread.join();
885	>	assertTrue(thread.interrupted);
886	>	assertFalse(thread.isAlive());
887	>	}
888	>
889	>	/**
890	>	* await is interruptible
891	>	*/
892	>	public void testAwait_Interrupt() throws InterruptedException {
893	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
894	>	final Condition c = lock.writeLock().newCondition();
895	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
896	>	public void realRun() throws InterruptedException {
897	>	lock.writeLock().lock();
898	>	c.await();
899	>	lock.writeLock().unlock();
900	>	}});
901	>
902	>	t.start();
903	>	Thread.sleep(SHORT_DELAY_MS);
904	>	t.interrupt();
905	>	t.join(SHORT_DELAY_MS);
906	>	assertFalse(t.isAlive());
907	>	}
908	>
909	>	/**
910	>	* awaitNanos is interruptible
911	>	*/
912	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
913	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
914	>	final Condition c = lock.writeLock().newCondition();
915	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
916	>	public void realRun() throws InterruptedException {
917	>	lock.writeLock().lock();
918	>	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
919	>	lock.writeLock().unlock();
920	>	}});
921	>
922	>	t.start();
923	>	Thread.sleep(SHORT_DELAY_MS);
924	>	t.interrupt();
925	>	t.join(SHORT_DELAY_MS);
926	>	assertFalse(t.isAlive());
927	>	}
928	>
929	>	/**
930	>	* awaitUntil is interruptible
931	>	*/
932	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
933	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
934	>	final Condition c = lock.writeLock().newCondition();
935	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
936	>	public void realRun() throws InterruptedException {
937	>	lock.writeLock().lock();
938	>	java.util.Date d = new java.util.Date();
939	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
940	>	lock.writeLock().unlock();
941	>	}});
942	>
943	>	t.start();
944	>	Thread.sleep(SHORT_DELAY_MS);
945	>	t.interrupt();
946	>	t.join(SHORT_DELAY_MS);
947	>	assertFalse(t.isAlive());
948	>	}
949	>
950	>	/**
951	>	* signalAll wakes up all threads
952	>	*/
953	>	public void testSignalAll() throws InterruptedException {
954	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
955	>	final Condition c = lock.writeLock().newCondition();
956	>	Thread t1 = new Thread(new CheckedRunnable() {
957	>	public void realRun() throws InterruptedException {
958	>	lock.writeLock().lock();
959	>	c.await();
960	>	lock.writeLock().unlock();
961	>	}});
962	>
963	>	Thread t2 = new Thread(new CheckedRunnable() {
964	>	public void realRun() throws InterruptedException {
965	>	lock.writeLock().lock();
966	>	c.await();
967	>	lock.writeLock().unlock();
968	>	}});
969	>
970	>	t1.start();
971	>	t2.start();
972	>	Thread.sleep(SHORT_DELAY_MS);
973	>	lock.writeLock().lock();
974	>	c.signalAll();
975	>	lock.writeLock().unlock();
976	>	t1.join(SHORT_DELAY_MS);
977	>	t2.join(SHORT_DELAY_MS);
978	>	assertFalse(t1.isAlive());
979	>	assertFalse(t2.isAlive());
980	>	}
981	>
982	>	/**
983	>	* A serialized lock deserializes as unlocked
984	>	*/
985	>	public void testSerialization() throws Exception {
986	>	ReentrantReadWriteLock l = new ReentrantReadWriteLock();
987	>	l.readLock().lock();
988	>	l.readLock().unlock();
989	>
990	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
991	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
992	>	out.writeObject(l);
993	>	out.close();
994	>
995	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
996	>	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
997	>	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
998	>	r.readLock().lock();
999	>	r.readLock().unlock();
1000	>	}
1001	>
1002	>	/**
1003	>	* hasQueuedThreads reports whether there are waiting threads
1004	>	*/
1005	>	public void testhasQueuedThreads() throws InterruptedException {
1006	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1007	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1008	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1009	>	assertFalse(lock.hasQueuedThreads());
1010	>	lock.writeLock().lock();
1011	>	t1.start();
1012	>	Thread.sleep(SHORT_DELAY_MS);
1013	>	assertTrue(lock.hasQueuedThreads());
1014	>	t2.start();
1015	>	Thread.sleep(SHORT_DELAY_MS);
1016	>	assertTrue(lock.hasQueuedThreads());
1017	>	t1.interrupt();
1018	>	Thread.sleep(SHORT_DELAY_MS);
1019	>	assertTrue(lock.hasQueuedThreads());
1020	>	lock.writeLock().unlock();
1021	>	Thread.sleep(SHORT_DELAY_MS);
1022	>	assertFalse(lock.hasQueuedThreads());
1023	>	t1.join();
1024	>	t2.join();
1025	>	}
1026	>
1027	>	/**
1028	>	* hasQueuedThread(null) throws NPE
1029	>	*/
1030	>	public void testHasQueuedThreadNPE() {
1031	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1032	>	try {
1033	>	sync.hasQueuedThread(null);
1034	>	shouldThrow();
1035	>	} catch (NullPointerException success) {}
1036	>	}
1037	>
1038	>	/**
1039	>	* hasQueuedThread reports whether a thread is queued.
1040	>	*/
1041	>	public void testHasQueuedThread() throws InterruptedException {
1042	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1043	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1044	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1045	>	assertFalse(sync.hasQueuedThread(t1));
1046	>	assertFalse(sync.hasQueuedThread(t2));
1047	>	sync.writeLock().lock();
1048	>	t1.start();
1049	>	Thread.sleep(SHORT_DELAY_MS);
1050	>	assertTrue(sync.hasQueuedThread(t1));
1051	>	t2.start();
1052	>	Thread.sleep(SHORT_DELAY_MS);
1053	>	assertTrue(sync.hasQueuedThread(t1));
1054	>	assertTrue(sync.hasQueuedThread(t2));
1055	>	t1.interrupt();
1056	>	Thread.sleep(SHORT_DELAY_MS);
1057	>	assertFalse(sync.hasQueuedThread(t1));
1058	>	assertTrue(sync.hasQueuedThread(t2));
1059	>	sync.writeLock().unlock();
1060	>	Thread.sleep(SHORT_DELAY_MS);
1061	>	assertFalse(sync.hasQueuedThread(t1));
1062	>	Thread.sleep(SHORT_DELAY_MS);
1063	>	assertFalse(sync.hasQueuedThread(t2));
1064	>	t1.join();
1065	>	t2.join();
1066	>	}
1067	>
1068	>
1069	>	/**
1070	>	* getQueueLength reports number of waiting threads
1071	>	*/
1072	>	public void testGetQueueLength() throws InterruptedException {
1073	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1074	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1075	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1076	>	assertEquals(0, lock.getQueueLength());
1077	>	lock.writeLock().lock();
1078	>	t1.start();
1079	>	Thread.sleep(SHORT_DELAY_MS);
1080	>	assertEquals(1, lock.getQueueLength());
1081	>	t2.start();
1082	>	Thread.sleep(SHORT_DELAY_MS);
1083	>	assertEquals(2, lock.getQueueLength());
1084	>	t1.interrupt();
1085	>	Thread.sleep(SHORT_DELAY_MS);
1086	>	assertEquals(1, lock.getQueueLength());
1087	>	lock.writeLock().unlock();
1088	>	Thread.sleep(SHORT_DELAY_MS);
1089	>	assertEquals(0, lock.getQueueLength());
1090	>	t1.join();
1091	>	t2.join();
1092	>	}
1093	>
1094	>	/**
1095	>	* getQueuedThreads includes waiting threads
1096	>	*/
1097	>	public void testGetQueuedThreads() throws InterruptedException {
1098	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1099	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1100	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1101	>	assertTrue(lock.getQueuedThreads().isEmpty());
1102	>	lock.writeLock().lock();
1103	>	assertTrue(lock.getQueuedThreads().isEmpty());
1104	>	t1.start();
1105	>	Thread.sleep(SHORT_DELAY_MS);
1106	>	assertTrue(lock.getQueuedThreads().contains(t1));
1107	>	t2.start();
1108	>	Thread.sleep(SHORT_DELAY_MS);
1109	>	assertTrue(lock.getQueuedThreads().contains(t1));
1110	>	assertTrue(lock.getQueuedThreads().contains(t2));
1111	>	t1.interrupt();
1112	>	Thread.sleep(SHORT_DELAY_MS);
1113	>	assertFalse(lock.getQueuedThreads().contains(t1));
1114	>	assertTrue(lock.getQueuedThreads().contains(t2));
1115	>	lock.writeLock().unlock();
1116	>	Thread.sleep(SHORT_DELAY_MS);
1117	>	assertTrue(lock.getQueuedThreads().isEmpty());
1118	>	t1.join();
1119	>	t2.join();
1120	>	}
1121	>
1122	>	/**
1123	>	* hasWaiters throws NPE if null
1124	>	*/
1125	>	public void testHasWaitersNPE() {
1126	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1127	>	try {
1128	>	lock.hasWaiters(null);
1129	>	shouldThrow();
1130	>	} catch (NullPointerException success) {}
1131	>	}
1132	>
1133	>	/**
1134	>	* getWaitQueueLength throws NPE if null
1135	>	*/
1136	>	public void testGetWaitQueueLengthNPE() {
1137	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1138	>	try {
1139	>	lock.getWaitQueueLength(null);
1140	>	shouldThrow();
1141	>	} catch (NullPointerException success) {}
1142	>	}
1143	>
1144	>
1145	>	/**
1146	>	* getWaitingThreads throws NPE if null
1147	>	*/
1148	>	public void testGetWaitingThreadsNPE() {
1149	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1150	>	try {
1151	>	lock.getWaitingThreads(null);
1152	>	shouldThrow();
1153	>	} catch (NullPointerException success) {}
1154	>	}
1155	>
1156	>	/**
1157	>	* hasWaiters throws IAE if not owned
1158	>	*/
1159	>	public void testHasWaitersIAE() {
1160	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1161	>	final Condition c = lock.writeLock().newCondition();
1162	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1163	>	try {
1164	>	lock2.hasWaiters(c);
1165	>	shouldThrow();
1166	>	} catch (IllegalArgumentException success) {}
1167	>	}
1168	>
1169	>	/**
1170	>	* hasWaiters throws IMSE if not locked
1171	>	*/
1172	>	public void testHasWaitersIMSE() {
1173	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1174	>	final Condition c = lock.writeLock().newCondition();
1175	>	try {
1176	>	lock.hasWaiters(c);
1177	>	shouldThrow();
1178	>	} catch (IllegalMonitorStateException success) {}
1179	>	}
1180	>
1181	>
1182	>	/**
1183	>	* getWaitQueueLength throws IAE if not owned
1184	>	*/
1185	>	public void testGetWaitQueueLengthIAE() {
1186	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1187	>	final Condition c = lock.writeLock().newCondition();
1188	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1189	>	try {
1190	>	lock2.getWaitQueueLength(c);
1191	>	shouldThrow();
1192	>	} catch (IllegalArgumentException success) {}
1193	>	}
1194	>
1195	>	/**
1196	>	* getWaitQueueLength throws IMSE if not locked
1197	>	*/
1198	>	public void testGetWaitQueueLengthIMSE() {
1199	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1200	>	final Condition c = lock.writeLock().newCondition();
1201	>	try {
1202	>	lock.getWaitQueueLength(c);
1203	>	shouldThrow();
1204	>	} catch (IllegalMonitorStateException success) {}
1205	>	}
1206	>
1207	>
1208	>	/**
1209	>	* getWaitingThreads throws IAE if not owned
1210	>	*/
1211	>	public void testGetWaitingThreadsIAE() {
1212	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1213	>	final Condition c = lock.writeLock().newCondition();
1214	>	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1215	>	try {
1216	>	lock2.getWaitingThreads(c);
1217	>	shouldThrow();
1218	>	} catch (IllegalArgumentException success) {}
1219	>	}
1220	>
1221	>	/**
1222	>	* getWaitingThreads throws IMSE if not locked
1223	>	*/
1224	>	public void testGetWaitingThreadsIMSE() {
1225	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1226	>	final Condition c = lock.writeLock().newCondition();
1227	>	try {
1228	>	lock.getWaitingThreads(c);
1229	>	shouldThrow();
1230	>	} catch (IllegalMonitorStateException success) {}
1231	>	}
1232	>
1233	>
1234	>	/**
1235	>	* hasWaiters returns true when a thread is waiting, else false
1236	>	*/
1237	>	public void testHasWaiters() throws InterruptedException {
1238	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1239	>	final Condition c = lock.writeLock().newCondition();
1240	>	Thread t = new Thread(new CheckedRunnable() {
1241	>	public void realRun() throws InterruptedException {
1242	>	lock.writeLock().lock();
1243	>	threadAssertFalse(lock.hasWaiters(c));
1244	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1245	>	c.await();
1246	>	lock.writeLock().unlock();
1247	>	}});
1248	>
1249	>	t.start();
1250	>	Thread.sleep(SHORT_DELAY_MS);
1251	>	lock.writeLock().lock();
1252	>	assertTrue(lock.hasWaiters(c));
1253	>	assertEquals(1, lock.getWaitQueueLength(c));
1254	>	c.signal();
1255	>	lock.writeLock().unlock();
1256	>	Thread.sleep(SHORT_DELAY_MS);
1257	>	lock.writeLock().lock();
1258	>	assertFalse(lock.hasWaiters(c));
1259	>	assertEquals(0, lock.getWaitQueueLength(c));
1260	>	lock.writeLock().unlock();
1261	>	t.join(SHORT_DELAY_MS);
1262	>	assertFalse(t.isAlive());
1263	>	}
1264	>
1265	>	/**
1266	>	* getWaitQueueLength returns number of waiting threads
1267	>	*/
1268	>	public void testGetWaitQueueLength() throws InterruptedException {
1269	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1270	>	final Condition c = lock.writeLock().newCondition();
1271	>	Thread t = new Thread(new CheckedRunnable() {
1272	>	public void realRun() throws InterruptedException {
1273	>	lock.writeLock().lock();
1274	>	threadAssertFalse(lock.hasWaiters(c));
1275	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1276	>	c.await();
1277	>	lock.writeLock().unlock();
1278	>	}});
1279	>
1280	>	t.start();
1281	>	Thread.sleep(SHORT_DELAY_MS);
1282	>	lock.writeLock().lock();
1283	>	assertTrue(lock.hasWaiters(c));
1284	>	assertEquals(1, lock.getWaitQueueLength(c));
1285	>	c.signal();
1286	>	lock.writeLock().unlock();
1287	>	Thread.sleep(SHORT_DELAY_MS);
1288	>	lock.writeLock().lock();
1289	>	assertFalse(lock.hasWaiters(c));
1290	>	assertEquals(0, lock.getWaitQueueLength(c));
1291	>	lock.writeLock().unlock();
1292	>	t.join(SHORT_DELAY_MS);
1293	>	assertFalse(t.isAlive());
1294	>	}
1295	>
1296	>
1297	>	/**
1298	>	* getWaitingThreads returns only and all waiting threads
1299	>	*/
1300	>	public void testGetWaitingThreads() throws InterruptedException {
1301	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1302	>	final Condition c = lock.writeLock().newCondition();
1303	>	Thread t1 = new Thread(new CheckedRunnable() {
1304	>	public void realRun() throws InterruptedException {
1305	>	lock.writeLock().lock();
1306	>	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1307	>	c.await();
1308	>	lock.writeLock().unlock();
1309	>	}});
1310	>
1311	>	Thread t2 = new Thread(new CheckedRunnable() {
1312	>	public void realRun() throws InterruptedException {
1313	>	lock.writeLock().lock();
1314	>	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1315	>	c.await();
1316	>	lock.writeLock().unlock();
1317	>	}});
1318	>
1319	>	lock.writeLock().lock();
1320	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1321	>	lock.writeLock().unlock();
1322	>	t1.start();
1323	>	Thread.sleep(SHORT_DELAY_MS);
1324	>	t2.start();
1325	>	Thread.sleep(SHORT_DELAY_MS);
1326	>	lock.writeLock().lock();
1327	>	assertTrue(lock.hasWaiters(c));
1328	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
1329	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
1330	>	c.signalAll();
1331	>	lock.writeLock().unlock();
1332	>	Thread.sleep(SHORT_DELAY_MS);
1333	>	lock.writeLock().lock();
1334	>	assertFalse(lock.hasWaiters(c));
1335	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1336	>	lock.writeLock().unlock();
1337	>	t1.join(SHORT_DELAY_MS);
1338	>	t2.join(SHORT_DELAY_MS);
1339	>	assertFalse(t1.isAlive());
1340	>	assertFalse(t2.isAlive());
1341	>	}
1342	>
1343	>	/**
1344	>	* toString indicates current lock state
1345	>	*/
1346	>	public void testToString() {
1347	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1348	>	String us = lock.toString();
1349	>	assertTrue(us.indexOf("Write locks = 0") >= 0);
1350	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1351	>	lock.writeLock().lock();
1352	>	String ws = lock.toString();
1353	>	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1354	>	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1355	>	lock.writeLock().unlock();
1356	>	lock.readLock().lock();
1357	>	lock.readLock().lock();
1358	>	String rs = lock.toString();
1359	>	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1360	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1361	>	}
1362	>
1363	>	/**
1364	>	* readLock.toString indicates current lock state
1365	>	*/
1366	>	public void testReadLockToString() {
1367	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1368	>	String us = lock.readLock().toString();
1369	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1370	>	lock.readLock().lock();
1371	>	lock.readLock().lock();
1372	>	String rs = lock.readLock().toString();
1373	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1374	>	}
1375	>
1376	>	/**
1377	>	* writeLock.toString indicates current lock state
1378	>	*/
1379	>	public void testWriteLockToString() {
1380	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1381	>	String us = lock.writeLock().toString();
1382	>	assertTrue(us.indexOf("Unlocked") >= 0);
1383	>	lock.writeLock().lock();
1384	>	String ls = lock.writeLock().toString();
1385	>	assertTrue(ls.indexOf("Locked") >= 0);
1386		}
112	–
1387
1388		}

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