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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 1.34 by jsr166, Tue Nov 17 14:45:32 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	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
697	>	lock.writeLock().unlock();
698	>	}
699	>
700	>	/**
701	>	* read timed tryLock times out if write-locked
702	>	*/
703	>	public void testReadTryLock_Timeout() throws InterruptedException {
704	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
705	>	lock.writeLock().lock();
706	>	Thread t = new Thread(new CheckedRunnable() {
707	>	public void realRun() throws InterruptedException {
708	>	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
709	>	}});
710	>
711	>	t.start();
712	>	t.join();
713	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
714	>	lock.writeLock().unlock();
715	>	}
716	>
717	>
718	>	/**
719	>	* write lockInterruptibly succeeds if lock free else is interruptible
720	>	*/
721	>	public void testWriteLockInterruptibly() throws InterruptedException {
722	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
723	>	lock.writeLock().lockInterruptibly();
724	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
725	>	public void realRun() throws InterruptedException {
726	>	lock.writeLock().lockInterruptibly();
727	>	}});
728	>
729	>	t.start();
730	>	Thread.sleep(SHORT_DELAY_MS);
731	>	t.interrupt();
732	>	Thread.sleep(SHORT_DELAY_MS);
733	>	t.join();
734	>	lock.writeLock().unlock();
735	>	}
736	>
737	>	/**
738	>	*  read lockInterruptibly succeeds if lock free else is interruptible
739	>	*/
740	>	public void testReadLockInterruptibly() throws InterruptedException {
741	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
742	>	lock.writeLock().lockInterruptibly();
743	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
744	>	public void realRun() throws InterruptedException {
745	>	lock.readLock().lockInterruptibly();
746	>	}});
747	>
748	>	t.start();
749	>	Thread.sleep(SHORT_DELAY_MS);
750	>	t.interrupt();
751	>	t.join();
752	>	lock.writeLock().unlock();
753	>	}
754	>
755	>	/**
756	>	* Calling await without holding lock throws IllegalMonitorStateException
757	>	*/
758	>	public void testAwait_IllegalMonitor() throws InterruptedException {
759	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
760	>	final Condition c = lock.writeLock().newCondition();
761	>	try {
762	>	c.await();
763	>	shouldThrow();
764	>	} catch (IllegalMonitorStateException success) {}
765	>	}
766	>
767	>	/**
768	>	* Calling signal without holding lock throws IllegalMonitorStateException
769	>	*/
770	>	public void testSignal_IllegalMonitor() {
771	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
772	>	final Condition c = lock.writeLock().newCondition();
773	>	try {
774	>	c.signal();
775	>	shouldThrow();
776	>	} catch (IllegalMonitorStateException success) {}
777	>	}
778	>
779	>	/**
780	>	* awaitNanos without a signal times out
781	>	*/
782	>	public void testAwaitNanos_Timeout() throws InterruptedException {
783	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
784	>	final Condition c = lock.writeLock().newCondition();
785	>
786	>	lock.writeLock().lock();
787	>	long t = c.awaitNanos(100);
788	>	assertTrue(t <= 0);
789	>	lock.writeLock().unlock();
790	>	}
791	>
792	>
793	>	/**
794	>	*  timed await without a signal times out
795	>	*/
796	>	public void testAwait_Timeout() throws InterruptedException {
797	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
798	>	final Condition c = lock.writeLock().newCondition();
799	>	lock.writeLock().lock();
800	>	assertFalse(c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
801	>	lock.writeLock().unlock();
802	>	}
803	>
804	>	/**
805	>	* awaitUntil without a signal times out
806	>	*/
807	>	public void testAwaitUntil_Timeout() throws InterruptedException {
808	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
809	>	final Condition c = lock.writeLock().newCondition();
810	>	lock.writeLock().lock();
811	>	java.util.Date d = new java.util.Date();
812	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
813	>	lock.writeLock().unlock();
814	>	}
815	>
816	>	/**
817	>	* await returns when signalled
818	>	*/
819	>	public void testAwait() throws InterruptedException {
820	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
821	>	final Condition c = lock.writeLock().newCondition();
822	>	Thread t = new Thread(new CheckedRunnable() {
823	>	public void realRun() throws InterruptedException {
824	>	lock.writeLock().lock();
825	>	c.await();
826	>	lock.writeLock().unlock();
827	>	}});
828	>
829	>	t.start();
830	>	Thread.sleep(SHORT_DELAY_MS);
831	>	lock.writeLock().lock();
832	>	c.signal();
833	>	lock.writeLock().unlock();
834	>	t.join(SHORT_DELAY_MS);
835	>	assertFalse(t.isAlive());
836	>	}
837	>
838	>	/** A helper class for uninterruptible wait tests */
839	>	class UninterruptableThread extends Thread {
840	>	private Lock lock;
841	>	private Condition c;
842	>
843	>	public volatile boolean canAwake = false;
844	>	public volatile boolean interrupted = false;
845	>	public volatile boolean lockStarted = false;
846	>
847	>	public UninterruptableThread(Lock lock, Condition c) {
848	>	this.lock = lock;
849	>	this.c = c;
850	>	}
851	>
852	>	public synchronized void run() {
853	>	lock.lock();
854	>	lockStarted = true;
855	>
856	>	while (!canAwake) {
857	>	c.awaitUninterruptibly();
858	>	}
859	>
860	>	interrupted = isInterrupted();
861	>	lock.unlock();
862	>	}
863	>	}
864	>
865	>	/**
866	>	* awaitUninterruptibly doesn't abort on interrupt
867	>	*/
868	>	public void testAwaitUninterruptibly() throws InterruptedException {
869	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
870	>	final Condition c = lock.writeLock().newCondition();
871	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
872	>
873	>	thread.start();
874	>
875	>	while (!thread.lockStarted) {
876	>	Thread.sleep(100);
877	>	}
878	>
879	>	lock.writeLock().lock();
880	>	try {
881	>	thread.interrupt();
882	>	thread.canAwake = true;
883	>	c.signal();
884	>	} finally {
885	>	lock.writeLock().unlock();
886	>	}
887	>
888	>	thread.join();
889	>	assertTrue(thread.interrupted);
890	>	assertFalse(thread.isAlive());
891	>	}
892	>
893	>	/**
894	>	* await is interruptible
895	>	*/
896	>	public void testAwait_Interrupt() throws InterruptedException {
897	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
898	>	final Condition c = lock.writeLock().newCondition();
899	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
900	>	public void realRun() throws InterruptedException {
901	>	lock.writeLock().lock();
902	>	c.await();
903	>	lock.writeLock().unlock();
904	>	}});
905	>
906	>	t.start();
907	>	Thread.sleep(SHORT_DELAY_MS);
908	>	t.interrupt();
909	>	t.join(SHORT_DELAY_MS);
910	>	assertFalse(t.isAlive());
911	>	}
912	>
913	>	/**
914	>	* awaitNanos is interruptible
915	>	*/
916	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
917	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
918	>	final Condition c = lock.writeLock().newCondition();
919	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
920	>	public void realRun() throws InterruptedException {
921	>	lock.writeLock().lock();
922	>	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
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	>	* awaitUntil is interruptible
935	>	*/
936	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
937	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
938	>	final Condition c = lock.writeLock().newCondition();
939	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
940	>	public void realRun() throws InterruptedException {
941	>	lock.writeLock().lock();
942	>	java.util.Date d = new java.util.Date();
943	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
944	>	lock.writeLock().unlock();
945	>	}});
946	>
947	>	t.start();
948	>	Thread.sleep(SHORT_DELAY_MS);
949	>	t.interrupt();
950	>	t.join(SHORT_DELAY_MS);
951	>	assertFalse(t.isAlive());
952	>	}
953	>
954	>	/**
955	>	* signalAll wakes up all threads
956	>	*/
957	>	public void testSignalAll() throws InterruptedException {
958	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
959	>	final Condition c = lock.writeLock().newCondition();
960	>	Thread t1 = new Thread(new CheckedRunnable() {
961	>	public void realRun() throws InterruptedException {
962	>	lock.writeLock().lock();
963	>	c.await();
964	>	lock.writeLock().unlock();
965	>	}});
966	>
967	>	Thread t2 = new Thread(new CheckedRunnable() {
968	>	public void realRun() throws InterruptedException {
969	>	lock.writeLock().lock();
970	>	c.await();
971	>	lock.writeLock().unlock();
972	>	}});
973	>
974	>	t1.start();
975	>	t2.start();
976	>	Thread.sleep(SHORT_DELAY_MS);
977	>	lock.writeLock().lock();
978	>	c.signalAll();
979	>	lock.writeLock().unlock();
980	>	t1.join(SHORT_DELAY_MS);
981	>	t2.join(SHORT_DELAY_MS);
982	>	assertFalse(t1.isAlive());
983	>	assertFalse(t2.isAlive());
984	>	}
985	>
986	>	/**
987	>	* A serialized lock deserializes as unlocked
988	>	*/
989	>	public void testSerialization() throws Exception {
990	>	ReentrantReadWriteLock l = new ReentrantReadWriteLock();
991	>	l.readLock().lock();
992	>	l.readLock().unlock();
993	>
994	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
995	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
996	>	out.writeObject(l);
997	>	out.close();
998	>
999	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1000	>	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1001	>	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1002	>	r.readLock().lock();
1003	>	r.readLock().unlock();
1004	>	}
1005	>
1006	>	/**
1007	>	* hasQueuedThreads reports whether there are waiting threads
1008	>	*/
1009	>	public void testhasQueuedThreads() throws InterruptedException {
1010	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1011	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1012	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1013	>	assertFalse(lock.hasQueuedThreads());
1014	>	lock.writeLock().lock();
1015	>	t1.start();
1016	>	Thread.sleep(SHORT_DELAY_MS);
1017	>	assertTrue(lock.hasQueuedThreads());
1018	>	t2.start();
1019	>	Thread.sleep(SHORT_DELAY_MS);
1020	>	assertTrue(lock.hasQueuedThreads());
1021	>	t1.interrupt();
1022	>	Thread.sleep(SHORT_DELAY_MS);
1023	>	assertTrue(lock.hasQueuedThreads());
1024	>	lock.writeLock().unlock();
1025	>	Thread.sleep(SHORT_DELAY_MS);
1026	>	assertFalse(lock.hasQueuedThreads());
1027	>	t1.join();
1028	>	t2.join();
1029	>	}
1030	>
1031	>	/**
1032	>	* hasQueuedThread(null) throws NPE
1033	>	*/
1034	>	public void testHasQueuedThreadNPE() {
1035	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1036	>	try {
1037	>	sync.hasQueuedThread(null);
1038	>	shouldThrow();
1039	>	} catch (NullPointerException success) {}
1040	>	}
1041	>
1042	>	/**
1043	>	* hasQueuedThread reports whether a thread is queued.
1044	>	*/
1045	>	public void testHasQueuedThread() throws InterruptedException {
1046	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1047	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1048	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1049	>	assertFalse(sync.hasQueuedThread(t1));
1050	>	assertFalse(sync.hasQueuedThread(t2));
1051	>	sync.writeLock().lock();
1052	>	t1.start();
1053	>	Thread.sleep(SHORT_DELAY_MS);
1054	>	assertTrue(sync.hasQueuedThread(t1));
1055	>	t2.start();
1056	>	Thread.sleep(SHORT_DELAY_MS);
1057	>	assertTrue(sync.hasQueuedThread(t1));
1058	>	assertTrue(sync.hasQueuedThread(t2));
1059	>	t1.interrupt();
1060	>	Thread.sleep(SHORT_DELAY_MS);
1061	>	assertFalse(sync.hasQueuedThread(t1));
1062	>	assertTrue(sync.hasQueuedThread(t2));
1063	>	sync.writeLock().unlock();
1064	>	Thread.sleep(SHORT_DELAY_MS);
1065	>	assertFalse(sync.hasQueuedThread(t1));
1066	>	Thread.sleep(SHORT_DELAY_MS);
1067	>	assertFalse(sync.hasQueuedThread(t2));
1068	>	t1.join();
1069	>	t2.join();
1070	>	}
1071	>
1072	>
1073	>	/**
1074	>	* getQueueLength reports number of waiting threads
1075	>	*/
1076	>	public void testGetQueueLength() throws InterruptedException {
1077	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1078	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1079	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1080	>	assertEquals(0, lock.getQueueLength());
1081	>	lock.writeLock().lock();
1082	>	t1.start();
1083	>	Thread.sleep(SHORT_DELAY_MS);
1084	>	assertEquals(1, lock.getQueueLength());
1085	>	t2.start();
1086	>	Thread.sleep(SHORT_DELAY_MS);
1087	>	assertEquals(2, lock.getQueueLength());
1088	>	t1.interrupt();
1089	>	Thread.sleep(SHORT_DELAY_MS);
1090	>	assertEquals(1, lock.getQueueLength());
1091	>	lock.writeLock().unlock();
1092	>	Thread.sleep(SHORT_DELAY_MS);
1093	>	assertEquals(0, lock.getQueueLength());
1094	>	t1.join();
1095	>	t2.join();
1096	>	}
1097	>
1098	>	/**
1099	>	* getQueuedThreads includes waiting threads
1100	>	*/
1101	>	public void testGetQueuedThreads() throws InterruptedException {
1102	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1103	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1104	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1105	>	assertTrue(lock.getQueuedThreads().isEmpty());
1106	>	lock.writeLock().lock();
1107	>	assertTrue(lock.getQueuedThreads().isEmpty());
1108	>	t1.start();
1109	>	Thread.sleep(SHORT_DELAY_MS);
1110	>	assertTrue(lock.getQueuedThreads().contains(t1));
1111	>	t2.start();
1112	>	Thread.sleep(SHORT_DELAY_MS);
1113	>	assertTrue(lock.getQueuedThreads().contains(t1));
1114	>	assertTrue(lock.getQueuedThreads().contains(t2));
1115	>	t1.interrupt();
1116	>	Thread.sleep(SHORT_DELAY_MS);
1117	>	assertFalse(lock.getQueuedThreads().contains(t1));
1118	>	assertTrue(lock.getQueuedThreads().contains(t2));
1119	>	lock.writeLock().unlock();
1120	>	Thread.sleep(SHORT_DELAY_MS);
1121	>	assertTrue(lock.getQueuedThreads().isEmpty());
1122	>	t1.join();
1123	>	t2.join();
1124	>	}
1125	>
1126	>	/**
1127	>	* hasWaiters throws NPE if null
1128	>	*/
1129	>	public void testHasWaitersNPE() {
1130	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1131	>	try {
1132	>	lock.hasWaiters(null);
1133	>	shouldThrow();
1134	>	} catch (NullPointerException success) {}
1135	>	}
1136	>
1137	>	/**
1138	>	* getWaitQueueLength throws NPE if null
1139	>	*/
1140	>	public void testGetWaitQueueLengthNPE() {
1141	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1142	>	try {
1143	>	lock.getWaitQueueLength(null);
1144	>	shouldThrow();
1145	>	} catch (NullPointerException success) {}
1146	>	}
1147	>
1148	>
1149	>	/**
1150	>	* getWaitingThreads throws NPE if null
1151	>	*/
1152	>	public void testGetWaitingThreadsNPE() {
1153	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1154	>	try {
1155	>	lock.getWaitingThreads(null);
1156	>	shouldThrow();
1157	>	} catch (NullPointerException success) {}
1158	>	}
1159	>
1160	>	/**
1161	>	* hasWaiters throws IAE if not owned
1162	>	*/
1163	>	public void testHasWaitersIAE() {
1164	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1165	>	final Condition c = lock.writeLock().newCondition();
1166	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1167	>	try {
1168	>	lock2.hasWaiters(c);
1169	>	shouldThrow();
1170	>	} catch (IllegalArgumentException success) {}
1171	>	}
1172	>
1173	>	/**
1174	>	* hasWaiters throws IMSE if not locked
1175	>	*/
1176	>	public void testHasWaitersIMSE() {
1177	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1178	>	final Condition c = lock.writeLock().newCondition();
1179	>	try {
1180	>	lock.hasWaiters(c);
1181	>	shouldThrow();
1182	>	} catch (IllegalMonitorStateException success) {}
1183	>	}
1184	>
1185	>
1186	>	/**
1187	>	* getWaitQueueLength throws IAE if not owned
1188	>	*/
1189	>	public void testGetWaitQueueLengthIAE() {
1190	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1191	>	final Condition c = lock.writeLock().newCondition();
1192	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1193	>	try {
1194	>	lock2.getWaitQueueLength(c);
1195	>	shouldThrow();
1196	>	} catch (IllegalArgumentException success) {}
1197	>	}
1198	>
1199	>	/**
1200	>	* getWaitQueueLength throws IMSE if not locked
1201	>	*/
1202	>	public void testGetWaitQueueLengthIMSE() {
1203	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1204	>	final Condition c = lock.writeLock().newCondition();
1205	>	try {
1206	>	lock.getWaitQueueLength(c);
1207	>	shouldThrow();
1208	>	} catch (IllegalMonitorStateException success) {}
1209	>	}
1210	>
1211	>
1212	>	/**
1213	>	* getWaitingThreads throws IAE if not owned
1214	>	*/
1215	>	public void testGetWaitingThreadsIAE() {
1216	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1217	>	final Condition c = lock.writeLock().newCondition();
1218	>	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1219	>	try {
1220	>	lock2.getWaitingThreads(c);
1221	>	shouldThrow();
1222	>	} catch (IllegalArgumentException success) {}
1223	>	}
1224	>
1225	>	/**
1226	>	* getWaitingThreads throws IMSE if not locked
1227	>	*/
1228	>	public void testGetWaitingThreadsIMSE() {
1229	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1230	>	final Condition c = lock.writeLock().newCondition();
1231	>	try {
1232	>	lock.getWaitingThreads(c);
1233	>	shouldThrow();
1234	>	} catch (IllegalMonitorStateException success) {}
1235	>	}
1236	>
1237	>
1238	>	/**
1239	>	* hasWaiters returns true when a thread is waiting, else false
1240	>	*/
1241	>	public void testHasWaiters() throws InterruptedException {
1242	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1243	>	final Condition c = lock.writeLock().newCondition();
1244	>	Thread t = new Thread(new CheckedRunnable() {
1245	>	public void realRun() throws InterruptedException {
1246	>	lock.writeLock().lock();
1247	>	threadAssertFalse(lock.hasWaiters(c));
1248	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1249	>	c.await();
1250	>	lock.writeLock().unlock();
1251	>	}});
1252	>
1253	>	t.start();
1254	>	Thread.sleep(SHORT_DELAY_MS);
1255	>	lock.writeLock().lock();
1256	>	assertTrue(lock.hasWaiters(c));
1257	>	assertEquals(1, lock.getWaitQueueLength(c));
1258	>	c.signal();
1259	>	lock.writeLock().unlock();
1260	>	Thread.sleep(SHORT_DELAY_MS);
1261	>	lock.writeLock().lock();
1262	>	assertFalse(lock.hasWaiters(c));
1263	>	assertEquals(0, lock.getWaitQueueLength(c));
1264	>	lock.writeLock().unlock();
1265	>	t.join(SHORT_DELAY_MS);
1266	>	assertFalse(t.isAlive());
1267	>	}
1268	>
1269	>	/**
1270	>	* getWaitQueueLength returns number of waiting threads
1271	>	*/
1272	>	public void testGetWaitQueueLength() throws InterruptedException {
1273	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1274	>	final Condition c = lock.writeLock().newCondition();
1275	>	Thread t = new Thread(new CheckedRunnable() {
1276	>	public void realRun() throws InterruptedException {
1277	>	lock.writeLock().lock();
1278	>	threadAssertFalse(lock.hasWaiters(c));
1279	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1280	>	c.await();
1281	>	lock.writeLock().unlock();
1282	>	}});
1283	>
1284	>	t.start();
1285	>	Thread.sleep(SHORT_DELAY_MS);
1286	>	lock.writeLock().lock();
1287	>	assertTrue(lock.hasWaiters(c));
1288	>	assertEquals(1, lock.getWaitQueueLength(c));
1289	>	c.signal();
1290	>	lock.writeLock().unlock();
1291	>	Thread.sleep(SHORT_DELAY_MS);
1292	>	lock.writeLock().lock();
1293	>	assertFalse(lock.hasWaiters(c));
1294	>	assertEquals(0, lock.getWaitQueueLength(c));
1295	>	lock.writeLock().unlock();
1296	>	t.join(SHORT_DELAY_MS);
1297	>	assertFalse(t.isAlive());
1298	>	}
1299	>
1300	>
1301	>	/**
1302	>	* getWaitingThreads returns only and all waiting threads
1303	>	*/
1304	>	public void testGetWaitingThreads() throws InterruptedException {
1305	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1306	>	final Condition c = lock.writeLock().newCondition();
1307	>	Thread t1 = new Thread(new CheckedRunnable() {
1308	>	public void realRun() throws InterruptedException {
1309	>	lock.writeLock().lock();
1310	>	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1311	>	c.await();
1312	>	lock.writeLock().unlock();
1313	>	}});
1314	>
1315	>	Thread t2 = new Thread(new CheckedRunnable() {
1316	>	public void realRun() throws InterruptedException {
1317	>	lock.writeLock().lock();
1318	>	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1319	>	c.await();
1320	>	lock.writeLock().unlock();
1321	>	}});
1322	>
1323	>	lock.writeLock().lock();
1324	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1325	>	lock.writeLock().unlock();
1326	>	t1.start();
1327	>	Thread.sleep(SHORT_DELAY_MS);
1328	>	t2.start();
1329	>	Thread.sleep(SHORT_DELAY_MS);
1330	>	lock.writeLock().lock();
1331	>	assertTrue(lock.hasWaiters(c));
1332	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
1333	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
1334	>	c.signalAll();
1335	>	lock.writeLock().unlock();
1336	>	Thread.sleep(SHORT_DELAY_MS);
1337	>	lock.writeLock().lock();
1338	>	assertFalse(lock.hasWaiters(c));
1339	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1340	>	lock.writeLock().unlock();
1341	>	t1.join(SHORT_DELAY_MS);
1342	>	t2.join(SHORT_DELAY_MS);
1343	>	assertFalse(t1.isAlive());
1344	>	assertFalse(t2.isAlive());
1345	>	}
1346	>
1347	>	/**
1348	>	* toString indicates current lock state
1349	>	*/
1350	>	public void testToString() {
1351	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1352	>	String us = lock.toString();
1353	>	assertTrue(us.indexOf("Write locks = 0") >= 0);
1354	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1355	>	lock.writeLock().lock();
1356	>	String ws = lock.toString();
1357	>	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1358	>	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1359	>	lock.writeLock().unlock();
1360	>	lock.readLock().lock();
1361	>	lock.readLock().lock();
1362	>	String rs = lock.toString();
1363	>	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1364	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1365	>	}
1366	>
1367	>	/**
1368	>	* readLock.toString indicates current lock state
1369	>	*/
1370	>	public void testReadLockToString() {
1371	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1372	>	String us = lock.readLock().toString();
1373	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1374	>	lock.readLock().lock();
1375	>	lock.readLock().lock();
1376	>	String rs = lock.readLock().toString();
1377	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1378	>	}
1379	>
1380	>	/**
1381	>	* writeLock.toString indicates current lock state
1382	>	*/
1383	>	public void testWriteLockToString() {
1384	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1385	>	String us = lock.writeLock().toString();
1386	>	assertTrue(us.indexOf("Unlocked") >= 0);
1387	>	lock.writeLock().lock();
1388	>	String ls = lock.writeLock().toString();
1389	>	assertTrue(ls.indexOf("Locked") >= 0);
1390		}
112	–
1391
1392		}

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