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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 1.27 by dl, Thu May 18 10:29:23 2006 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
2	>	* Written by Doug Lea with assistance from members of JCP JSR-166
3	>	* Expert Group and released to the public domain, as explained at
4	>	* http://creativecommons.org/licenses/publicdomain
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9		import junit.framework.*;
10		import java.util.concurrent.locks.*;
11		import java.util.concurrent.*;
12	+	import java.io.*;
13	+	import java.util.*;
14
15	<	public class ReentrantReadWriteLockTest extends TestCase {
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());
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 implements Runnable {
27	+	final ReentrantReadWriteLock lock;
28	+	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
29	+	public void run() {
30	+	try {
31	+	lock.writeLock().lockInterruptibly();
32	+	} catch(InterruptedException success){}
33	+	}
34	+	}
35	+
36	+
37	+	/**
38	+	* A runnable calling lockInterruptibly that expects to be
39	+	* interrupted
40	+	*/
41	+	class InterruptedLockRunnable implements Runnable {
42	+	final ReentrantReadWriteLock lock;
43	+	InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
44	+	public void run() {
45	+	try {
46	+	lock.writeLock().lockInterruptibly();
47	+	threadShouldThrow();
48	+	} catch(InterruptedException success){}
49	+	}
50	+	}
51	+
52	+	/**
53	+	* Subclass to expose protected methods
54	+	*/
55	+	static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
56	+	PublicReentrantReadWriteLock() { super(); }
57	+	public Collection<Thread> getQueuedThreads() {
58	+	return super.getQueuedThreads();
59	+	}
60	+	public Collection<Thread> getWaitingThreads(Condition c) {
61	+	return super.getWaitingThreads(c);
62	+	}
63	+	}
64
65	<	private static long SHORT_DELAY_MS = 100;
66	<	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	<	*
65	>	/**
66	>	* Constructor sets given fairness, and is in unlocked state
67		*/
68	+	public void testConstructor() {
69	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
70	+	assertFalse(rl.isFair());
71	+	assertFalse(rl.isWriteLocked());
72	+	assertEquals(0, rl.getReadLockCount());
73	+	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
74	+	assertTrue(r2.isFair());
75	+	assertFalse(r2.isWriteLocked());
76	+	assertEquals(0, r2.getReadLockCount());
77	+	}
78	+
79	+	/**
80	+	* write-locking and read-locking an unlocked lock succeed
81	+	*/
82	+	public void testLock() {
83	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
84	+	rl.writeLock().lock();
85	+	assertTrue(rl.isWriteLocked());
86	+	assertTrue(rl.isWriteLockedByCurrentThread());
87	+	assertTrue(rl.writeLock().isHeldByCurrentThread());
88	+	assertEquals(0, rl.getReadLockCount());
89	+	rl.writeLock().unlock();
90	+	assertFalse(rl.isWriteLocked());
91	+	assertFalse(rl.isWriteLockedByCurrentThread());
92	+	assertFalse(rl.writeLock().isHeldByCurrentThread());
93	+	assertEquals(0, rl.getReadLockCount());
94	+	rl.readLock().lock();
95	+	assertFalse(rl.isWriteLocked());
96	+	assertFalse(rl.isWriteLockedByCurrentThread());
97	+	assertEquals(1, rl.getReadLockCount());
98	+	rl.readLock().unlock();
99	+	assertFalse(rl.isWriteLocked());
100	+	assertFalse(rl.isWriteLockedByCurrentThread());
101	+	assertEquals(0, rl.getReadLockCount());
102	+	}
103	+
104	+
105	+	/**
106	+	* locking an unlocked fair lock succeeds
107	+	*/
108	+	public void testFairLock() {
109	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
110	+	rl.writeLock().lock();
111	+	assertTrue(rl.isWriteLocked());
112	+	assertTrue(rl.isWriteLockedByCurrentThread());
113	+	assertTrue(rl.writeLock().isHeldByCurrentThread());
114	+	assertEquals(0, rl.getReadLockCount());
115	+	rl.writeLock().unlock();
116	+	assertFalse(rl.isWriteLocked());
117	+	assertFalse(rl.isWriteLockedByCurrentThread());
118	+	assertFalse(rl.writeLock().isHeldByCurrentThread());
119	+	assertEquals(0, rl.getReadLockCount());
120	+	rl.readLock().lock();
121	+	assertFalse(rl.isWriteLocked());
122	+	assertFalse(rl.isWriteLockedByCurrentThread());
123	+	assertEquals(1, rl.getReadLockCount());
124	+	rl.readLock().unlock();
125	+	assertFalse(rl.isWriteLocked());
126	+	assertFalse(rl.isWriteLockedByCurrentThread());
127	+	assertEquals(0, rl.getReadLockCount());
128	+	}
129	+
130	+	/**
131	+	* getWriteHoldCount returns number of recursive holds
132	+	*/
133	+	public void testGetWriteHoldCount() {
134	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
135	+	for(int i = 1; i <= SIZE; i++) {
136	+	lock.writeLock().lock();
137	+	assertEquals(i,lock.getWriteHoldCount());
138	+	}
139	+	for(int i = SIZE; i > 0; i--) {
140	+	lock.writeLock().unlock();
141	+	assertEquals(i-1,lock.getWriteHoldCount());
142	+	}
143	+	}
144	+
145	+	/**
146	+	* WriteLock.getHoldCount returns number of recursive holds
147	+	*/
148	+	public void testGetHoldCount() {
149	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
150	+	for(int i = 1; i <= SIZE; i++) {
151	+	lock.writeLock().lock();
152	+	assertEquals(i,lock.writeLock().getHoldCount());
153	+	}
154	+	for(int i = SIZE; i > 0; i--) {
155	+	lock.writeLock().unlock();
156	+	assertEquals(i-1,lock.writeLock().getHoldCount());
157	+	}
158	+	}
159	+
160	+	/**
161	+	* getReadHoldCount returns number of recursive holds
162	+	*/
163	+	public void testGetReadHoldCount() {
164	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
165	+	for(int i = 1; i <= SIZE; i++) {
166	+	lock.readLock().lock();
167	+	assertEquals(i,lock.getReadHoldCount());
168	+	}
169	+	for(int i = SIZE; i > 0; i--) {
170	+	lock.readLock().unlock();
171	+	assertEquals(i-1,lock.getReadHoldCount());
172	+	}
173	+	}
174
175	<	public void testIllegalMonitorStateException(){
175	>
176	>	/**
177	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
178	>	*/
179	>	public void testUnlock_IllegalMonitorStateException() {
180		ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
181	<	try{
181	>	try {
182		rl.writeLock().unlock();
183	<	fail("Should of thown Illegal Monitor State Exception");
183	>	shouldThrow();
184	>	} catch(IllegalMonitorStateException success){}
185	>	}
186	>
187	>
188	>	/**
189	>	* write-lockInterruptibly is interruptible
190	>	*/
191	>	public void testWriteLockInterruptibly_Interrupted() {
192	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
193	>	Thread t = new Thread(new Runnable() {
194	>	public void run() {
195	>	try {
196	>	lock.writeLock().lockInterruptibly();
197	>	lock.writeLock().unlock();
198	>	lock.writeLock().lockInterruptibly();
199	>	lock.writeLock().unlock();
200	>	} catch(InterruptedException success){}
201	>	}
202	>	});
203	>	try {
204	>	lock.writeLock().lock();
205	>	t.start();
206	>	Thread.sleep(SHORT_DELAY_MS);
207	>	t.interrupt();
208	>	Thread.sleep(SHORT_DELAY_MS);
209	>	lock.writeLock().unlock();
210	>	t.join();
211	>	} catch(Exception e){
212	>	unexpectedException();
213	>	}
214	>	}
215
216	<	}catch(IllegalMonitorStateException sucess){}
216	>	/**
217	>	* timed write-tryLock is interruptible
218	>	*/
219	>	public void testWriteTryLock_Interrupted() {
220	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
221	>	lock.writeLock().lock();
222	>	Thread t = new Thread(new Runnable() {
223	>	public void run() {
224	>	try {
225	>	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
226	>	} catch(InterruptedException success){}
227	>	}
228	>	});
229	>	try {
230	>	t.start();
231	>	t.interrupt();
232	>	lock.writeLock().unlock();
233	>	t.join();
234	>	} catch(Exception e){
235	>	unexpectedException();
236	>	}
237	>	}
238
239	+	/**
240	+	* read-lockInterruptibly is interruptible
241	+	*/
242	+	public void testReadLockInterruptibly_Interrupted() {
243	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
244	+	lock.writeLock().lock();
245	+	Thread t = new Thread(new Runnable() {
246	+	public void run() {
247	+	try {
248	+	lock.readLock().lockInterruptibly();
249	+	} catch(InterruptedException success){}
250	+	}
251	+	});
252	+	try {
253	+	t.start();
254	+	Thread.sleep(SHORT_DELAY_MS);
255	+	t.interrupt();
256	+	Thread.sleep(SHORT_DELAY_MS);
257	+	lock.writeLock().unlock();
258	+	t.join();
259	+	} catch(Exception e){
260	+	unexpectedException();
261	+	}
262	+	}
263
264	+	/**
265	+	* timed read-tryLock is interruptible
266	+	*/
267	+	public void testReadTryLock_Interrupted() {
268	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
269	+	lock.writeLock().lock();
270	+	Thread t = new Thread(new Runnable() {
271	+	public void run() {
272	+	try {
273	+	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
274	+	threadShouldThrow();
275	+	} catch(InterruptedException success){}
276	+	}
277	+	});
278	+	try {
279	+	t.start();
280	+	t.interrupt();
281	+	t.join();
282	+	} catch(Exception e){
283	+	unexpectedException();
284	+	}
285		}
286	+
287
288	<	/*
289	<	* 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.
288	>	/**
289	>	* write-tryLock fails if locked
290		*/
291	+	public void testWriteTryLockWhenLocked() {
292	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
293	+	lock.writeLock().lock();
294	+	Thread t = new Thread(new Runnable() {
295	+	public void run() {
296	+	threadAssertFalse(lock.writeLock().tryLock());
297	+	}
298	+	});
299	+	try {
300	+	t.start();
301	+	t.join();
302	+	lock.writeLock().unlock();
303	+	} catch(Exception e){
304	+	unexpectedException();
305	+	}
306	+	}
307
308	<	public void testInterruptedException(){
308	>	/**
309	>	* read-tryLock fails if locked
310	>	*/
311	>	public void testReadTryLockWhenLocked() {
312		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
313		lock.writeLock().lock();
314		Thread t = new Thread(new Runnable() {
315	<	public void run(){
316	<	try{
317	<	lock.writeLock().lockInterruptibly();
318	<	fail("should throw");
319	<	}catch(InterruptedException sucess){}
315	>	public void run() {
316	>	threadAssertFalse(lock.readLock().tryLock());
317	>	}
318	>	});
319	>	try {
320	>	t.start();
321	>	t.join();
322	>	lock.writeLock().unlock();
323	>	} catch(Exception e){
324	>	unexpectedException();
325	>	}
326	>	}
327	>
328	>	/**
329	>	* Multiple threads can hold a read lock when not write-locked
330	>	*/
331	>	public void testMultipleReadLocks() {
332	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
333	>	lock.readLock().lock();
334	>	Thread t = new Thread(new Runnable() {
335	>	public void run() {
336	>	threadAssertTrue(lock.readLock().tryLock());
337	>	lock.readLock().unlock();
338		}
339		});
340	<	t.start();
341	<	t.interrupt();
342	<	lock.writeLock().unlock();
340	>	try {
341	>	t.start();
342	>	t.join();
343	>	lock.readLock().unlock();
344	>	} catch(Exception e){
345	>	unexpectedException();
346	>	}
347		}
348
349	<	/*
350	<	* tests for interrupted exception on a timed wait
68	<	*
349	>	/**
350	>	* A writelock succeeds after reading threads unlock
351		*/
352	+	public void testWriteAfterMultipleReadLocks() {
353	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
354	+	lock.readLock().lock();
355	+	Thread t1 = new Thread(new Runnable() {
356	+	public void run() {
357	+	lock.readLock().lock();
358	+	lock.readLock().unlock();
359	+	}
360	+	});
361	+	Thread t2 = new Thread(new Runnable() {
362	+	public void run() {
363	+	lock.writeLock().lock();
364	+	lock.writeLock().unlock();
365	+	}
366	+	});
367	+
368	+	try {
369	+	t1.start();
370	+	t2.start();
371	+	Thread.sleep(SHORT_DELAY_MS);
372	+	lock.readLock().unlock();
373	+	t1.join(MEDIUM_DELAY_MS);
374	+	t2.join(MEDIUM_DELAY_MS);
375	+	assertTrue(!t1.isAlive());
376	+	assertTrue(!t2.isAlive());
377	+
378	+	} catch(Exception e){
379	+	unexpectedException();
380	+	}
381	+	}
382	+
383	+	/**
384	+	* Readlocks succeed after a writing thread unlocks
385	+	*/
386	+	public void testReadAfterWriteLock() {
387	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
388	+	lock.writeLock().lock();
389	+	Thread t1 = new Thread(new Runnable() {
390	+	public void run() {
391	+	lock.readLock().lock();
392	+	lock.readLock().unlock();
393	+	}
394	+	});
395	+	Thread t2 = new Thread(new Runnable() {
396	+	public void run() {
397	+	lock.readLock().lock();
398	+	lock.readLock().unlock();
399	+	}
400	+	});
401	+
402	+	try {
403	+	t1.start();
404	+	t2.start();
405	+	Thread.sleep(SHORT_DELAY_MS);
406	+	lock.writeLock().unlock();
407	+	t1.join(MEDIUM_DELAY_MS);
408	+	t2.join(MEDIUM_DELAY_MS);
409	+	assertTrue(!t1.isAlive());
410	+	assertTrue(!t2.isAlive());
411	+
412	+	} catch(Exception e){
413	+	unexpectedException();
414	+	}
415	+	}
416	+
417	+	/**
418	+	* Read trylock succeeds if write locked by current thread
419	+	*/
420	+	public void testReadHoldingWriteLock() {
421	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
422	+	lock.writeLock().lock();
423	+	assertTrue(lock.readLock().tryLock());
424	+	lock.readLock().unlock();
425	+	lock.writeLock().unlock();
426	+	}
427	+
428	+	/**
429	+	* Read lock succeeds if write locked by current thread even if
430	+	* other threads are waiting for readlock
431	+	*/
432	+	public void testReadHoldingWriteLock2() {
433	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
434	+	lock.writeLock().lock();
435	+	Thread t1 = new Thread(new Runnable() {
436	+	public void run() {
437	+	lock.readLock().lock();
438	+	lock.readLock().unlock();
439	+	}
440	+	});
441	+	Thread t2 = new Thread(new Runnable() {
442	+	public void run() {
443	+	lock.readLock().lock();
444	+	lock.readLock().unlock();
445	+	}
446	+	});
447	+
448	+	try {
449	+	t1.start();
450	+	t2.start();
451	+	lock.readLock().lock();
452	+	lock.readLock().unlock();
453	+	Thread.sleep(SHORT_DELAY_MS);
454	+	lock.readLock().lock();
455	+	lock.readLock().unlock();
456	+	lock.writeLock().unlock();
457	+	t1.join(MEDIUM_DELAY_MS);
458	+	t2.join(MEDIUM_DELAY_MS);
459	+	assertTrue(!t1.isAlive());
460	+	assertTrue(!t2.isAlive());
461	+
462	+	} catch(Exception e){
463	+	unexpectedException();
464	+	}
465	+	}
466	+
467	+	/**
468	+	*  Read lock succeeds if write locked by current thread even if
469	+	* other threads are waiting for writelock
470	+	*/
471	+	public void testReadHoldingWriteLock3() {
472	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
473	+	lock.writeLock().lock();
474	+	Thread t1 = new Thread(new Runnable() {
475	+	public void run() {
476	+	lock.writeLock().lock();
477	+	lock.writeLock().unlock();
478	+	}
479	+	});
480	+	Thread t2 = new Thread(new Runnable() {
481	+	public void run() {
482	+	lock.writeLock().lock();
483	+	lock.writeLock().unlock();
484	+	}
485	+	});
486	+
487	+	try {
488	+	t1.start();
489	+	t2.start();
490	+	lock.readLock().lock();
491	+	lock.readLock().unlock();
492	+	Thread.sleep(SHORT_DELAY_MS);
493	+	lock.readLock().lock();
494	+	lock.readLock().unlock();
495	+	lock.writeLock().unlock();
496	+	t1.join(MEDIUM_DELAY_MS);
497	+	t2.join(MEDIUM_DELAY_MS);
498	+	assertTrue(!t1.isAlive());
499	+	assertTrue(!t2.isAlive());
500	+
501	+	} catch(Exception e){
502	+	unexpectedException();
503	+	}
504	+	}
505	+
506	+
507	+	/**
508	+	*  Write lock succeeds if write locked by current thread even if
509	+	* other threads are waiting for writelock
510	+	*/
511	+	public void testWriteHoldingWriteLock4() {
512	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
513	+	lock.writeLock().lock();
514	+	Thread t1 = new Thread(new Runnable() {
515	+	public void run() {
516	+	lock.writeLock().lock();
517	+	lock.writeLock().unlock();
518	+	}
519	+	});
520	+	Thread t2 = new Thread(new Runnable() {
521	+	public void run() {
522	+	lock.writeLock().lock();
523	+	lock.writeLock().unlock();
524	+	}
525	+	});
526	+
527	+	try {
528	+	t1.start();
529	+	t2.start();
530	+	lock.writeLock().lock();
531	+	lock.writeLock().unlock();
532	+	Thread.sleep(SHORT_DELAY_MS);
533	+	lock.writeLock().lock();
534	+	lock.writeLock().unlock();
535	+	lock.writeLock().unlock();
536	+	t1.join(MEDIUM_DELAY_MS);
537	+	t2.join(MEDIUM_DELAY_MS);
538	+	assertTrue(!t1.isAlive());
539	+	assertTrue(!t2.isAlive());
540	+
541	+	} catch(Exception e){
542	+	unexpectedException();
543	+	}
544	+	}
545	+
546	+
547	+	/**
548	+	* Fair Read trylock succeeds if write locked by current thread
549	+	*/
550	+	public void testReadHoldingWriteLockFair() {
551	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
552	+	lock.writeLock().lock();
553	+	assertTrue(lock.readLock().tryLock());
554	+	lock.readLock().unlock();
555	+	lock.writeLock().unlock();
556	+	}
557	+
558	+	/**
559	+	* Fair Read lock succeeds if write locked by current thread even if
560	+	* other threads are waiting for readlock
561	+	*/
562	+	public void testReadHoldingWriteLockFair2() {
563	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
564	+	lock.writeLock().lock();
565	+	Thread t1 = new Thread(new Runnable() {
566	+	public void run() {
567	+	lock.readLock().lock();
568	+	lock.readLock().unlock();
569	+	}
570	+	});
571	+	Thread t2 = new Thread(new Runnable() {
572	+	public void run() {
573	+	lock.readLock().lock();
574	+	lock.readLock().unlock();
575	+	}
576	+	});
577	+
578	+	try {
579	+	t1.start();
580	+	t2.start();
581	+	lock.readLock().lock();
582	+	lock.readLock().unlock();
583	+	Thread.sleep(SHORT_DELAY_MS);
584	+	lock.readLock().lock();
585	+	lock.readLock().unlock();
586	+	lock.writeLock().unlock();
587	+	t1.join(MEDIUM_DELAY_MS);
588	+	t2.join(MEDIUM_DELAY_MS);
589	+	assertTrue(!t1.isAlive());
590	+	assertTrue(!t2.isAlive());
591	+
592	+	} catch(Exception e){
593	+	unexpectedException();
594	+	}
595	+	}
596	+
597	+
598	+	/**
599	+	* Fair Read lock succeeds if write locked by current thread even if
600	+	* other threads are waiting for writelock
601	+	*/
602	+	public void testReadHoldingWriteLockFair3() {
603	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
604	+	lock.writeLock().lock();
605	+	Thread t1 = new Thread(new Runnable() {
606	+	public void run() {
607	+	lock.writeLock().lock();
608	+	lock.writeLock().unlock();
609	+	}
610	+	});
611	+	Thread t2 = new Thread(new Runnable() {
612	+	public void run() {
613	+	lock.writeLock().lock();
614	+	lock.writeLock().unlock();
615	+	}
616	+	});
617	+
618	+	try {
619	+	t1.start();
620	+	t2.start();
621	+	lock.readLock().lock();
622	+	lock.readLock().unlock();
623	+	Thread.sleep(SHORT_DELAY_MS);
624	+	lock.readLock().lock();
625	+	lock.readLock().unlock();
626	+	lock.writeLock().unlock();
627	+	t1.join(MEDIUM_DELAY_MS);
628	+	t2.join(MEDIUM_DELAY_MS);
629	+	assertTrue(!t1.isAlive());
630	+	assertTrue(!t2.isAlive());
631	+
632	+	} catch(Exception e){
633	+	unexpectedException();
634	+	}
635	+	}
636	+
637	+
638	+	/**
639	+	* Fair Write lock succeeds if write locked by current thread even if
640	+	* other threads are waiting for writelock
641	+	*/
642	+	public void testWriteHoldingWriteLockFair4() {
643	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
644	+	lock.writeLock().lock();
645	+	Thread t1 = new Thread(new Runnable() {
646	+	public void run() {
647	+	lock.writeLock().lock();
648	+	lock.writeLock().unlock();
649	+	}
650	+	});
651	+	Thread t2 = new Thread(new Runnable() {
652	+	public void run() {
653	+	lock.writeLock().lock();
654	+	lock.writeLock().unlock();
655	+	}
656	+	});
657	+
658	+	try {
659	+	t1.start();
660	+	t2.start();
661	+	Thread.sleep(SHORT_DELAY_MS);
662	+	assertTrue(lock.isWriteLockedByCurrentThread());
663	+	assertTrue(lock.getWriteHoldCount() == 1);
664	+	lock.writeLock().lock();
665	+	assertTrue(lock.getWriteHoldCount() == 2);
666	+	lock.writeLock().unlock();
667	+	lock.writeLock().lock();
668	+	lock.writeLock().unlock();
669	+	lock.writeLock().unlock();
670	+	t1.join(MEDIUM_DELAY_MS);
671	+	t2.join(MEDIUM_DELAY_MS);
672	+	assertTrue(!t1.isAlive());
673	+	assertTrue(!t2.isAlive());
674	+
675	+	} catch(Exception e){
676	+	unexpectedException();
677	+	}
678	+	}
679	+
680	+
681	+	/**
682	+	* Read tryLock succeeds if readlocked but not writelocked
683	+	*/
684	+	public void testTryLockWhenReadLocked() {
685	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
686	+	lock.readLock().lock();
687	+	Thread t = new Thread(new Runnable() {
688	+	public void run() {
689	+	threadAssertTrue(lock.readLock().tryLock());
690	+	lock.readLock().unlock();
691	+	}
692	+	});
693	+	try {
694	+	t.start();
695	+	t.join();
696	+	lock.readLock().unlock();
697	+	} catch(Exception e){
698	+	unexpectedException();
699	+	}
700	+	}
701	+
702	+
703	+
704	+	/**
705	+	* write tryLock fails when readlocked
706	+	*/
707	+	public void testWriteTryLockWhenReadLocked() {
708	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
709	+	lock.readLock().lock();
710	+	Thread t = new Thread(new Runnable() {
711	+	public void run() {
712	+	threadAssertFalse(lock.writeLock().tryLock());
713	+	}
714	+	});
715	+	try {
716	+	t.start();
717	+	t.join();
718	+	lock.readLock().unlock();
719	+	} catch(Exception e){
720	+	unexpectedException();
721	+	}
722	+	}
723	+
724	+
725	+	/**
726	+	* Fair Read tryLock succeeds if readlocked but not writelocked
727	+	*/
728	+	public void testTryLockWhenReadLockedFair() {
729	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
730	+	lock.readLock().lock();
731	+	Thread t = new Thread(new Runnable() {
732	+	public void run() {
733	+	threadAssertTrue(lock.readLock().tryLock());
734	+	lock.readLock().unlock();
735	+	}
736	+	});
737	+	try {
738	+	t.start();
739	+	t.join();
740	+	lock.readLock().unlock();
741	+	} catch(Exception e){
742	+	unexpectedException();
743	+	}
744	+	}
745	+
746	+
747	+
748	+	/**
749	+	* Fair write tryLock fails when readlocked
750	+	*/
751	+	public void testWriteTryLockWhenReadLockedFair() {
752	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
753	+	lock.readLock().lock();
754	+	Thread t = new Thread(new Runnable() {
755	+	public void run() {
756	+	threadAssertFalse(lock.writeLock().tryLock());
757	+	}
758	+	});
759	+	try {
760	+	t.start();
761	+	t.join();
762	+	lock.readLock().unlock();
763	+	} catch(Exception e){
764	+	unexpectedException();
765	+	}
766	+	}
767	+
768
769
770	<	public void testInterruptedException2(){
770	>	/**
771	>	* write timed tryLock times out if locked
772	>	*/
773	>	public void testWriteTryLock_Timeout() {
774		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
775		lock.writeLock().lock();
776		Thread t = new Thread(new Runnable() {
777	<	public void run(){
778	<	try{
779	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
780	<	fail("should throw");
781	<	}catch(InterruptedException sucess){}
777	>	public void run() {
778	>	try {
779	>	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
780	>	} catch (Exception ex) {
781	>	threadUnexpectedException();
782	>	}
783	>	}
784	>	});
785	>	try {
786	>	t.start();
787	>	t.join();
788	>	lock.writeLock().unlock();
789	>	} catch(Exception e){
790	>	unexpectedException();
791	>	}
792	>	}
793	>
794	>	/**
795	>	* read timed tryLock times out if write-locked
796	>	*/
797	>	public void testReadTryLock_Timeout() {
798	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
799	>	lock.writeLock().lock();
800	>	Thread t = new Thread(new Runnable() {
801	>	public void run() {
802	>	try {
803	>	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
804	>	} catch (Exception ex) {
805	>	threadUnexpectedException();
806	>	}
807	>	}
808	>	});
809	>	try {
810	>	t.start();
811	>	t.join();
812	>	lock.writeLock().unlock();
813	>	} catch(Exception e){
814	>	unexpectedException();
815	>	}
816	>	}
817	>
818	>
819	>	/**
820	>	* write lockInterruptibly succeeds if lock free else is interruptible
821	>	*/
822	>	public void testWriteLockInterruptibly() {
823	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
824	>	try {
825	>	lock.writeLock().lockInterruptibly();
826	>	} catch(Exception e) {
827	>	unexpectedException();
828	>	}
829	>	Thread t = new Thread(new Runnable() {
830	>	public void run() {
831	>	try {
832	>	lock.writeLock().lockInterruptibly();
833	>	threadShouldThrow();
834	>	}
835	>	catch(InterruptedException success) {
836	>	}
837		}
838		});
839	<	t.start();
840	<	t.interrupt();
839	>	try {
840	>	t.start();
841	>	Thread.sleep(SHORT_DELAY_MS);
842	>	t.interrupt();
843	>	Thread.sleep(SHORT_DELAY_MS);
844	>	t.join();
845	>	lock.writeLock().unlock();
846	>	} catch(Exception e){
847	>	unexpectedException();
848	>	}
849		}
850
851	<
851	>	/**
852	>	*  read lockInterruptibly succeeds if lock free else is interruptible
853	>	*/
854	>	public void testReadLockInterruptibly() {
855	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
856	>	try {
857	>	lock.writeLock().lockInterruptibly();
858	>	} catch(Exception e) {
859	>	unexpectedException();
860	>	}
861	>	Thread t = new Thread(new Runnable() {
862	>	public void run() {
863	>	try {
864	>	lock.readLock().lockInterruptibly();
865	>	threadShouldThrow();
866	>	}
867	>	catch(InterruptedException success) {
868	>	}
869	>	}
870	>	});
871	>	try {
872	>	t.start();
873	>	Thread.sleep(SHORT_DELAY_MS);
874	>	t.interrupt();
875	>	t.join();
876	>	lock.writeLock().unlock();
877	>	} catch(Exception e){
878	>	unexpectedException();
879	>	}
880	>	}
881
882	<	/*
883	<	* current thread locks interruptibly the thread
91	<	* 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
882	>	/**
883	>	* Calling await without holding lock throws IllegalMonitorStateException
884		*/
885	+	public void testAwait_IllegalMonitor() {
886	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
887	+	final Condition c = lock.writeLock().newCondition();
888	+	try {
889	+	c.await();
890	+	shouldThrow();
891	+	}
892	+	catch (IllegalMonitorStateException success) {
893	+	}
894	+	catch (Exception ex) {
895	+	shouldThrow();
896	+	}
897	+	}
898
899	<	public void testLockedInterruptibly() {
899	>	/**
900	>	* Calling signal without holding lock throws IllegalMonitorStateException
901	>	*/
902	>	public void testSignal_IllegalMonitor() {
903		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
904	<	try {lock.writeLock().lockInterruptibly();} catch(Exception e) {}
904	>	final Condition c = lock.writeLock().newCondition();
905	>	try {
906	>	c.signal();
907	>	shouldThrow();
908	>	}
909	>	catch (IllegalMonitorStateException success) {
910	>	}
911	>	catch (Exception ex) {
912	>	unexpectedException();
913	>	}
914	>	}
915	>
916	>	/**
917	>	* awaitNanos without a signal times out
918	>	*/
919	>	public void testAwaitNanos_Timeout() {
920	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
921	>	final Condition c = lock.writeLock().newCondition();
922	>	try {
923	>	lock.writeLock().lock();
924	>	long t = c.awaitNanos(100);
925	>	assertTrue(t <= 0);
926	>	lock.writeLock().unlock();
927	>	}
928	>	catch (Exception ex) {
929	>	unexpectedException();
930	>	}
931	>	}
932	>
933	>
934	>	/**
935	>	*  timed await without a signal times out
936	>	*/
937	>	public void testAwait_Timeout() {
938	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
939	>	final Condition c = lock.writeLock().newCondition();
940	>	try {
941	>	lock.writeLock().lock();
942	>	lock.writeLock().unlock();
943	>	}
944	>	catch (Exception ex) {
945	>	unexpectedException();
946	>	}
947	>	}
948	>
949	>	/**
950	>	* awaitUntil without a signal times out
951	>	*/
952	>	public void testAwaitUntil_Timeout() {
953	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
954	>	final Condition c = lock.writeLock().newCondition();
955	>	try {
956	>	lock.writeLock().lock();
957	>	java.util.Date d = new java.util.Date();
958	>	lock.writeLock().unlock();
959	>	}
960	>	catch (Exception ex) {
961	>	unexpectedException();
962	>	}
963	>	}
964	>
965	>	/**
966	>	* await returns when signalled
967	>	*/
968	>	public void testAwait() {
969	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
970	>	final Condition c = lock.writeLock().newCondition();
971		Thread t = new Thread(new Runnable() {
972		public void run() {
973		try {
974	<	lock.writeLock().lockInterruptibly();
975	<	fail("Failed to generate an Interrupted Exception");
974	>	lock.writeLock().lock();
975	>	c.await();
976	>	lock.writeLock().unlock();
977		}
978	<	catch(InterruptedException e) {}
978	>	catch(InterruptedException e) {
979	>	threadUnexpectedException();
980	>	}
981		}
982		});
983	<	t.start();
984	<	t.interrupt();
983	>
984	>	try {
985	>	t.start();
986	>	Thread.sleep(SHORT_DELAY_MS);
987	>	lock.writeLock().lock();
988	>	c.signal();
989	>	lock.writeLock().unlock();
990	>	t.join(SHORT_DELAY_MS);
991	>	assertFalse(t.isAlive());
992	>	}
993	>	catch (Exception ex) {
994	>	unexpectedException();
995	>	}
996	>	}
997	>
998	>	/** A helper class for uninterruptible wait tests */
999	>	class UninterruptableThread extends Thread {
1000	>	private Lock lock;
1001	>	private Condition c;
1002	>
1003	>	public volatile boolean canAwake = false;
1004	>	public volatile boolean interrupted = false;
1005	>	public volatile boolean lockStarted = false;
1006	>
1007	>	public UninterruptableThread(Lock lock, Condition c) {
1008	>	this.lock = lock;
1009	>	this.c = c;
1010	>	}
1011	>
1012	>	public synchronized void run() {
1013	>	lock.lock();
1014	>	lockStarted = true;
1015	>
1016	>	while (!canAwake) {
1017	>	c.awaitUninterruptibly();
1018	>	}
1019	>
1020	>	interrupted = isInterrupted();
1021	>	lock.unlock();
1022	>	}
1023	>	}
1024	>
1025	>	/**
1026	>	* awaitUninterruptibly doesn't abort on interrupt
1027	>	*/
1028	>	public void testAwaitUninterruptibly() {
1029	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1030	>	final Condition c = lock.writeLock().newCondition();
1031	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
1032	>
1033	>	try {
1034	>	thread.start();
1035	>
1036	>	while (!thread.lockStarted) {
1037	>	Thread.sleep(100);
1038	>	}
1039	>
1040	>	lock.writeLock().lock();
1041	>	try {
1042	>	thread.interrupt();
1043	>	thread.canAwake = true;
1044	>	c.signal();
1045	>	} finally {
1046	>	lock.writeLock().unlock();
1047	>	}
1048	>
1049	>	thread.join();
1050	>	assertTrue(thread.interrupted);
1051	>	assertFalse(thread.isAlive());
1052	>	} catch (Exception ex) {
1053	>	unexpectedException();
1054	>	}
1055	>	}
1056	>
1057	>	/**
1058	>	* await is interruptible
1059	>	*/
1060	>	public void testAwait_Interrupt() {
1061	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1062	>	final Condition c = lock.writeLock().newCondition();
1063	>	Thread t = new Thread(new Runnable() {
1064	>	public void run() {
1065	>	try {
1066	>	lock.writeLock().lock();
1067	>	c.await();
1068	>	lock.writeLock().unlock();
1069	>	threadShouldThrow();
1070	>	}
1071	>	catch(InterruptedException success) {
1072	>	}
1073	>	}
1074	>	});
1075	>
1076	>	try {
1077	>	t.start();
1078	>	Thread.sleep(SHORT_DELAY_MS);
1079	>	t.interrupt();
1080	>	t.join(SHORT_DELAY_MS);
1081	>	assertFalse(t.isAlive());
1082	>	}
1083	>	catch (Exception ex) {
1084	>	unexpectedException();
1085	>	}
1086	>	}
1087	>
1088	>	/**
1089	>	* awaitNanos is interruptible
1090	>	*/
1091	>	public void testAwaitNanos_Interrupt() {
1092	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1093	>	final Condition c = lock.writeLock().newCondition();
1094	>	Thread t = new Thread(new Runnable() {
1095	>	public void run() {
1096	>	try {
1097	>	lock.writeLock().lock();
1098	>	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
1099	>	lock.writeLock().unlock();
1100	>	threadShouldThrow();
1101	>	}
1102	>	catch(InterruptedException success) {
1103	>	}
1104	>	}
1105	>	});
1106	>
1107	>	try {
1108	>	t.start();
1109	>	Thread.sleep(SHORT_DELAY_MS);
1110	>	t.interrupt();
1111	>	t.join(SHORT_DELAY_MS);
1112	>	assertFalse(t.isAlive());
1113	>	}
1114	>	catch (Exception ex) {
1115	>	unexpectedException();
1116	>	}
1117	>	}
1118	>
1119	>	/**
1120	>	* awaitUntil is interruptible
1121	>	*/
1122	>	public void testAwaitUntil_Interrupt() {
1123	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1124	>	final Condition c = lock.writeLock().newCondition();
1125	>	Thread t = new Thread(new Runnable() {
1126	>	public void run() {
1127	>	try {
1128	>	lock.writeLock().lock();
1129	>	java.util.Date d = new java.util.Date();
1130	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
1131	>	lock.writeLock().unlock();
1132	>	threadShouldThrow();
1133	>	}
1134	>	catch(InterruptedException success) {
1135	>	}
1136	>	}
1137	>	});
1138	>
1139	>	try {
1140	>	t.start();
1141	>	Thread.sleep(SHORT_DELAY_MS);
1142	>	t.interrupt();
1143	>	t.join(SHORT_DELAY_MS);
1144	>	assertFalse(t.isAlive());
1145	>	}
1146	>	catch (Exception ex) {
1147	>	unexpectedException();
1148	>	}
1149	>	}
1150	>
1151	>	/**
1152	>	* signalAll wakes up all threads
1153	>	*/
1154	>	public void testSignalAll() {
1155	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1156	>	final Condition c = lock.writeLock().newCondition();
1157	>	Thread t1 = new Thread(new Runnable() {
1158	>	public void run() {
1159	>	try {
1160	>	lock.writeLock().lock();
1161	>	c.await();
1162	>	lock.writeLock().unlock();
1163	>	}
1164	>	catch(InterruptedException e) {
1165	>	threadUnexpectedException();
1166	>	}
1167	>	}
1168	>	});
1169	>
1170	>	Thread t2 = new Thread(new Runnable() {
1171	>	public void run() {
1172	>	try {
1173	>	lock.writeLock().lock();
1174	>	c.await();
1175	>	lock.writeLock().unlock();
1176	>	}
1177	>	catch(InterruptedException e) {
1178	>	threadUnexpectedException();
1179	>	}
1180	>	}
1181	>	});
1182	>
1183	>	try {
1184	>	t1.start();
1185	>	t2.start();
1186	>	Thread.sleep(SHORT_DELAY_MS);
1187	>	lock.writeLock().lock();
1188	>	c.signalAll();
1189	>	lock.writeLock().unlock();
1190	>	t1.join(SHORT_DELAY_MS);
1191	>	t2.join(SHORT_DELAY_MS);
1192	>	assertFalse(t1.isAlive());
1193	>	assertFalse(t2.isAlive());
1194	>	}
1195	>	catch (Exception ex) {
1196	>	unexpectedException();
1197	>	}
1198	>	}
1199	>
1200	>	/**
1201	>	* A serialized lock deserializes as unlocked
1202	>	*/
1203	>	public void testSerialization() {
1204	>	ReentrantReadWriteLock l = new ReentrantReadWriteLock();
1205	>	l.readLock().lock();
1206	>	l.readLock().unlock();
1207	>
1208	>	try {
1209	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1210	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1211	>	out.writeObject(l);
1212	>	out.close();
1213	>
1214	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1215	>	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1216	>	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1217	>	r.readLock().lock();
1218	>	r.readLock().unlock();
1219	>	} catch(Exception e){
1220	>	e.printStackTrace();
1221	>	unexpectedException();
1222	>	}
1223	>	}
1224	>
1225	>	/**
1226	>	* hasQueuedThreads reports whether there are waiting threads
1227	>	*/
1228	>	public void testhasQueuedThreads() {
1229	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1230	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1231	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1232	>	try {
1233	>	assertFalse(lock.hasQueuedThreads());
1234	>	lock.writeLock().lock();
1235	>	t1.start();
1236	>	Thread.sleep(SHORT_DELAY_MS);
1237	>	assertTrue(lock.hasQueuedThreads());
1238	>	t2.start();
1239	>	Thread.sleep(SHORT_DELAY_MS);
1240	>	assertTrue(lock.hasQueuedThreads());
1241	>	t1.interrupt();
1242	>	Thread.sleep(SHORT_DELAY_MS);
1243	>	assertTrue(lock.hasQueuedThreads());
1244	>	lock.writeLock().unlock();
1245	>	Thread.sleep(SHORT_DELAY_MS);
1246	>	assertFalse(lock.hasQueuedThreads());
1247	>	t1.join();
1248	>	t2.join();
1249	>	} catch(Exception e){
1250	>	unexpectedException();
1251	>	}
1252	>	}
1253	>
1254	>	/**
1255	>	* hasQueuedThread(null) throws NPE
1256	>	*/
1257	>	public void testHasQueuedThreadNPE() {
1258	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1259	>	try {
1260	>	sync.hasQueuedThread(null);
1261	>	shouldThrow();
1262	>	} catch (NullPointerException success) {
1263	>	}
1264	>	}
1265	>
1266	>	/**
1267	>	* hasQueuedThread reports whether a thread is queued.
1268	>	*/
1269	>	public void testHasQueuedThread() {
1270	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1271	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1272	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1273	>	try {
1274	>	assertFalse(sync.hasQueuedThread(t1));
1275	>	assertFalse(sync.hasQueuedThread(t2));
1276	>	sync.writeLock().lock();
1277	>	t1.start();
1278	>	Thread.sleep(SHORT_DELAY_MS);
1279	>	assertTrue(sync.hasQueuedThread(t1));
1280	>	t2.start();
1281	>	Thread.sleep(SHORT_DELAY_MS);
1282	>	assertTrue(sync.hasQueuedThread(t1));
1283	>	assertTrue(sync.hasQueuedThread(t2));
1284	>	t1.interrupt();
1285	>	Thread.sleep(SHORT_DELAY_MS);
1286	>	assertFalse(sync.hasQueuedThread(t1));
1287	>	assertTrue(sync.hasQueuedThread(t2));
1288	>	sync.writeLock().unlock();
1289	>	Thread.sleep(SHORT_DELAY_MS);
1290	>	assertFalse(sync.hasQueuedThread(t1));
1291	>	Thread.sleep(SHORT_DELAY_MS);
1292	>	assertFalse(sync.hasQueuedThread(t2));
1293	>	t1.join();
1294	>	t2.join();
1295	>	} catch(Exception e){
1296	>	unexpectedException();
1297	>	}
1298	>	}
1299	>
1300	>
1301	>	/**
1302	>	* getQueueLength reports number of waiting threads
1303	>	*/
1304	>	public void testGetQueueLength() {
1305	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1306	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1307	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1308	>	try {
1309	>	assertEquals(0, lock.getQueueLength());
1310	>	lock.writeLock().lock();
1311	>	t1.start();
1312	>	Thread.sleep(SHORT_DELAY_MS);
1313	>	assertEquals(1, lock.getQueueLength());
1314	>	t2.start();
1315	>	Thread.sleep(SHORT_DELAY_MS);
1316	>	assertEquals(2, lock.getQueueLength());
1317	>	t1.interrupt();
1318	>	Thread.sleep(SHORT_DELAY_MS);
1319	>	assertEquals(1, lock.getQueueLength());
1320	>	lock.writeLock().unlock();
1321	>	Thread.sleep(SHORT_DELAY_MS);
1322	>	assertEquals(0, lock.getQueueLength());
1323	>	t1.join();
1324	>	t2.join();
1325	>	} catch(Exception e){
1326	>	unexpectedException();
1327	>	}
1328	>	}
1329	>
1330	>	/**
1331	>	* getQueuedThreads includes waiting threads
1332	>	*/
1333	>	public void testGetQueuedThreads() {
1334	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1335	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1336	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1337	>	try {
1338	>	assertTrue(lock.getQueuedThreads().isEmpty());
1339	>	lock.writeLock().lock();
1340	>	assertTrue(lock.getQueuedThreads().isEmpty());
1341	>	t1.start();
1342	>	Thread.sleep(SHORT_DELAY_MS);
1343	>	assertTrue(lock.getQueuedThreads().contains(t1));
1344	>	t2.start();
1345	>	Thread.sleep(SHORT_DELAY_MS);
1346	>	assertTrue(lock.getQueuedThreads().contains(t1));
1347	>	assertTrue(lock.getQueuedThreads().contains(t2));
1348	>	t1.interrupt();
1349	>	Thread.sleep(SHORT_DELAY_MS);
1350	>	assertFalse(lock.getQueuedThreads().contains(t1));
1351	>	assertTrue(lock.getQueuedThreads().contains(t2));
1352	>	lock.writeLock().unlock();
1353	>	Thread.sleep(SHORT_DELAY_MS);
1354	>	assertTrue(lock.getQueuedThreads().isEmpty());
1355	>	t1.join();
1356	>	t2.join();
1357	>	} catch(Exception e){
1358	>	unexpectedException();
1359	>	}
1360	>	}
1361	>
1362	>	/**
1363	>	* hasWaiters throws NPE if null
1364	>	*/
1365	>	public void testHasWaitersNPE() {
1366	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1367	>	try {
1368	>	lock.hasWaiters(null);
1369	>	shouldThrow();
1370	>	} catch (NullPointerException success) {
1371	>	} catch (Exception ex) {
1372	>	unexpectedException();
1373	>	}
1374	>	}
1375	>
1376	>	/**
1377	>	* getWaitQueueLength throws NPE if null
1378	>	*/
1379	>	public void testGetWaitQueueLengthNPE() {
1380	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1381	>	try {
1382	>	lock.getWaitQueueLength(null);
1383	>	shouldThrow();
1384	>	} catch (NullPointerException success) {
1385	>	} catch (Exception ex) {
1386	>	unexpectedException();
1387	>	}
1388	>	}
1389	>
1390	>
1391	>	/**
1392	>	* getWaitingThreads throws NPE if null
1393	>	*/
1394	>	public void testGetWaitingThreadsNPE() {
1395	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1396	>	try {
1397	>	lock.getWaitingThreads(null);
1398	>	shouldThrow();
1399	>	} catch (NullPointerException success) {
1400	>	} catch (Exception ex) {
1401	>	unexpectedException();
1402	>	}
1403	>	}
1404	>
1405	>	/**
1406	>	* hasWaiters throws IAE if not owned
1407	>	*/
1408	>	public void testHasWaitersIAE() {
1409	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1410	>	final Condition c = (lock.writeLock().newCondition());
1411	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1412	>	try {
1413	>	lock2.hasWaiters(c);
1414	>	shouldThrow();
1415	>	} catch (IllegalArgumentException success) {
1416	>	} catch (Exception ex) {
1417	>	unexpectedException();
1418	>	}
1419	>	}
1420	>
1421	>	/**
1422	>	* hasWaiters throws IMSE if not locked
1423	>	*/
1424	>	public void testHasWaitersIMSE() {
1425	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1426	>	final Condition c = (lock.writeLock().newCondition());
1427	>	try {
1428	>	lock.hasWaiters(c);
1429	>	shouldThrow();
1430	>	} catch (IllegalMonitorStateException success) {
1431	>	} catch (Exception ex) {
1432	>	unexpectedException();
1433	>	}
1434	>	}
1435	>
1436	>
1437	>	/**
1438	>	* getWaitQueueLength throws IAE if not owned
1439	>	*/
1440	>	public void testGetWaitQueueLengthIAE() {
1441	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1442	>	final Condition c = (lock.writeLock().newCondition());
1443	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1444	>	try {
1445	>	lock2.getWaitQueueLength(c);
1446	>	shouldThrow();
1447	>	} catch (IllegalArgumentException success) {
1448	>	} catch (Exception ex) {
1449	>	unexpectedException();
1450	>	}
1451	>	}
1452	>
1453	>	/**
1454	>	* getWaitQueueLength throws IMSE if not locked
1455	>	*/
1456	>	public void testGetWaitQueueLengthIMSE() {
1457	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1458	>	final Condition c = (lock.writeLock().newCondition());
1459	>	try {
1460	>	lock.getWaitQueueLength(c);
1461	>	shouldThrow();
1462	>	} catch (IllegalMonitorStateException success) {
1463	>	} catch (Exception ex) {
1464	>	unexpectedException();
1465	>	}
1466	>	}
1467	>
1468	>
1469	>	/**
1470	>	* getWaitingThreads throws IAE if not owned
1471	>	*/
1472	>	public void testGetWaitingThreadsIAE() {
1473	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1474	>	final Condition c = (lock.writeLock().newCondition());
1475	>	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1476	>	try {
1477	>	lock2.getWaitingThreads(c);
1478	>	shouldThrow();
1479	>	} catch (IllegalArgumentException success) {
1480	>	} catch (Exception ex) {
1481	>	unexpectedException();
1482	>	}
1483	>	}
1484	>
1485	>	/**
1486	>	* getWaitingThreads throws IMSE if not locked
1487	>	*/
1488	>	public void testGetWaitingThreadsIMSE() {
1489	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1490	>	final Condition c = (lock.writeLock().newCondition());
1491	>	try {
1492	>	lock.getWaitingThreads(c);
1493	>	shouldThrow();
1494	>	} catch (IllegalMonitorStateException success) {
1495	>	} catch (Exception ex) {
1496	>	unexpectedException();
1497	>	}
1498	>	}
1499	>
1500	>
1501	>	/**
1502	>	* hasWaiters returns true when a thread is waiting, else false
1503	>	*/
1504	>	public void testHasWaiters() {
1505	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1506	>	final Condition c = (lock.writeLock().newCondition());
1507	>	Thread t = new Thread(new Runnable() {
1508	>	public void run() {
1509	>	try {
1510	>	lock.writeLock().lock();
1511	>	threadAssertFalse(lock.hasWaiters(c));
1512	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1513	>	c.await();
1514	>	lock.writeLock().unlock();
1515	>	}
1516	>	catch(InterruptedException e) {
1517	>	threadUnexpectedException();
1518	>	}
1519	>	}
1520	>	});
1521	>
1522	>	try {
1523	>	t.start();
1524	>	Thread.sleep(SHORT_DELAY_MS);
1525	>	lock.writeLock().lock();
1526	>	assertTrue(lock.hasWaiters(c));
1527	>	assertEquals(1, lock.getWaitQueueLength(c));
1528	>	c.signal();
1529	>	lock.writeLock().unlock();
1530	>	Thread.sleep(SHORT_DELAY_MS);
1531	>	lock.writeLock().lock();
1532	>	assertFalse(lock.hasWaiters(c));
1533	>	assertEquals(0, lock.getWaitQueueLength(c));
1534	>	lock.writeLock().unlock();
1535	>	t.join(SHORT_DELAY_MS);
1536	>	assertFalse(t.isAlive());
1537	>	}
1538	>	catch (Exception ex) {
1539	>	unexpectedException();
1540	>	}
1541	>	}
1542	>
1543	>	/**
1544	>	* getWaitQueueLength returns number of waiting threads
1545	>	*/
1546	>	public void testGetWaitQueueLength() {
1547	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1548	>	final Condition c = (lock.writeLock().newCondition());
1549	>	Thread t = new Thread(new Runnable() {
1550	>	public void run() {
1551	>	try {
1552	>	lock.writeLock().lock();
1553	>	threadAssertFalse(lock.hasWaiters(c));
1554	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1555	>	c.await();
1556	>	lock.writeLock().unlock();
1557	>	}
1558	>	catch(InterruptedException e) {
1559	>	threadUnexpectedException();
1560	>	}
1561	>	}
1562	>	});
1563	>
1564	>	try {
1565	>	t.start();
1566	>	Thread.sleep(SHORT_DELAY_MS);
1567	>	lock.writeLock().lock();
1568	>	assertTrue(lock.hasWaiters(c));
1569	>	assertEquals(1, lock.getWaitQueueLength(c));
1570	>	c.signal();
1571	>	lock.writeLock().unlock();
1572	>	Thread.sleep(SHORT_DELAY_MS);
1573	>	lock.writeLock().lock();
1574	>	assertFalse(lock.hasWaiters(c));
1575	>	assertEquals(0, lock.getWaitQueueLength(c));
1576	>	lock.writeLock().unlock();
1577	>	t.join(SHORT_DELAY_MS);
1578	>	assertFalse(t.isAlive());
1579	>	}
1580	>	catch (Exception ex) {
1581	>	unexpectedException();
1582	>	}
1583	>	}
1584	>
1585	>
1586	>	/**
1587	>	* getWaitingThreads returns only and all waiting threads
1588	>	*/
1589	>	public void testGetWaitingThreads() {
1590	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1591	>	final Condition c = lock.writeLock().newCondition();
1592	>	Thread t1 = new Thread(new Runnable() {
1593	>	public void run() {
1594	>	try {
1595	>	lock.writeLock().lock();
1596	>	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1597	>	c.await();
1598	>	lock.writeLock().unlock();
1599	>	}
1600	>	catch(InterruptedException e) {
1601	>	threadUnexpectedException();
1602	>	}
1603	>	}
1604	>	});
1605	>
1606	>	Thread t2 = new Thread(new Runnable() {
1607	>	public void run() {
1608	>	try {
1609	>	lock.writeLock().lock();
1610	>	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1611	>	c.await();
1612	>	lock.writeLock().unlock();
1613	>	}
1614	>	catch(InterruptedException e) {
1615	>	threadUnexpectedException();
1616	>	}
1617	>	}
1618	>	});
1619	>
1620	>	try {
1621	>	lock.writeLock().lock();
1622	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1623	>	lock.writeLock().unlock();
1624	>	t1.start();
1625	>	Thread.sleep(SHORT_DELAY_MS);
1626	>	t2.start();
1627	>	Thread.sleep(SHORT_DELAY_MS);
1628	>	lock.writeLock().lock();
1629	>	assertTrue(lock.hasWaiters(c));
1630	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
1631	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
1632	>	c.signalAll();
1633	>	lock.writeLock().unlock();
1634	>	Thread.sleep(SHORT_DELAY_MS);
1635	>	lock.writeLock().lock();
1636	>	assertFalse(lock.hasWaiters(c));
1637	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1638	>	lock.writeLock().unlock();
1639	>	t1.join(SHORT_DELAY_MS);
1640	>	t2.join(SHORT_DELAY_MS);
1641	>	assertFalse(t1.isAlive());
1642	>	assertFalse(t2.isAlive());
1643	>	}
1644	>	catch (Exception ex) {
1645	>	unexpectedException();
1646	>	}
1647	>	}
1648	>
1649	>	/**
1650	>	* toString indicates current lock state
1651	>	*/
1652	>	public void testToString() {
1653	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1654	>	String us = lock.toString();
1655	>	assertTrue(us.indexOf("Write locks = 0") >= 0);
1656	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1657	>	lock.writeLock().lock();
1658	>	String ws = lock.toString();
1659	>	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1660	>	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1661	>	lock.writeLock().unlock();
1662	>	lock.readLock().lock();
1663	>	lock.readLock().lock();
1664	>	String rs = lock.toString();
1665	>	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1666	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1667	>	}
1668	>
1669	>	/**
1670	>	* readLock.toString indicates current lock state
1671	>	*/
1672	>	public void testReadLockToString() {
1673	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1674	>	String us = lock.readLock().toString();
1675	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1676	>	lock.readLock().lock();
1677	>	lock.readLock().lock();
1678	>	String rs = lock.readLock().toString();
1679	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1680	>	}
1681	>
1682	>	/**
1683	>	* writeLock.toString indicates current lock state
1684	>	*/
1685	>	public void testWriteLockToString() {
1686	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1687	>	String us = lock.writeLock().toString();
1688	>	assertTrue(us.indexOf("Unlocked") >= 0);
1689	>	lock.writeLock().lock();
1690	>	String ls = lock.writeLock().toString();
1691	>	assertTrue(ls.indexOf("Locked") >= 0);
1692		}
112	–
1693
1694		}

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