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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.3 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.35 by jsr166, Sat Nov 21 02:07:27 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 JSR166TestCase {
16		public static void main(String[] args) {
17	<	junit.textui.TestRunner.run (suite());
17	>	junit.textui.TestRunner.run (suite());
18		}
19		public static Test suite() {
20	<	return new TestSuite(ReentrantReadWriteLockTest.class);
20	>	return new TestSuite(ReentrantReadWriteLockTest.class);
21		}
22
23	<	static int HOLD_COUNT_TEST_LIMIT = 20;
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	>	/**
48	>	* Subclass to expose protected methods
49	>	*/
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	<	* Unlocks an unlocked lock, throws Illegal Monitor State
25	<	*
60	>	/**
61	>	* Constructor sets given fairness, and is in unlocked state
62		*/
63	<	public void testIllegalMonitorStateException(){
64	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
65	<	try{
66	<	rl.writeLock().unlock();
67	<	fail("Should of thown Illegal Monitor State Exception");
63	>	public void testConstructor() {
64	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
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	<	}catch(IllegalMonitorStateException success){}
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	<	public void testInterruptedException(){
130	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
131	<	lock.writeLock().lock();
132	<	Thread t = new Thread(new Runnable() {
133	<	public void run(){
134	<	try{
135	<	lock.writeLock().lockInterruptibly();
136	<	threadFail("should throw");
137	<	}catch(InterruptedException success){}
138	<	}
48	<	});
49	<	try {
50	<	t.start();
51	<	t.interrupt();
52	<	lock.writeLock().unlock();
53	<	t.join();
54	<	} catch(Exception e){
55	<	fail("unexpected exception");
56	<	}
57	<	}
58	<
59	<	public void testInterruptedException2(){
60	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
61	<	lock.writeLock().lock();
62	<	Thread t = new Thread(new Runnable() {
63	<	public void run(){
64	<	try{
65	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
66	<	threadFail("should throw");
67	<	}catch(InterruptedException success){}
68	<	}
69	<	});
70	<	try {
71	<	t.start();
72	<	t.interrupt();
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	<	t.join();
75	<	} catch(Exception e){
76	<	fail("unexpected exception");
140	>	assertEquals(i-1,lock.getWriteHoldCount());
141		}
142		}
143
144	<	public void testInterruptedException3(){
145	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
146	<	lock.writeLock().lock();
147	<	Thread t = new Thread(new Runnable() {
148	<	public void run(){
149	<	try{
150	<	lock.readLock().lockInterruptibly();
151	<	threadFail("should throw");
152	<	}catch(InterruptedException success){}
153	<	}
90	<	});
91	<	try {
92	<	t.start();
93	<	t.interrupt();
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	<	t.join();
96	<	} catch(Exception e){
97	<	fail("unexpected exception");
98	<	}
99	<	}
100	<
101	<	public void testInterruptedException4(){
102	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
103	<	lock.writeLock().lock();
104	<	Thread t = new Thread(new Runnable() {
105	<	public void run(){
106	<	try{
107	<	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
108	<	threadFail("should throw");
109	<	}catch(InterruptedException success){}
110	<	}
111	<	});
112	<	try {
113	<	t.start();
114	<	t.interrupt();
115	<	t.join();
116	<	} catch(Exception e){
117	<	fail("unexpected exception");
155	>	assertEquals(i-1,lock.writeLock().getHoldCount());
156		}
157		}
158
159	<
160	<	public void testTryLockWhenLocked() {
161	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
162	<	lock.writeLock().lock();
163	<	Thread t = new Thread(new Runnable() {
164	<	public void run(){
165	<	threadAssertFalse(lock.writeLock().tryLock());
166	<	}
129	<	});
130	<	try {
131	<	t.start();
132	<	t.join();
133	<	lock.writeLock().unlock();
134	<	} catch(Exception e){
135	<	fail("unexpected exception");
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	<	}
168	>	for (int i = SIZE; i > 0; i--) {
169	>	lock.readLock().unlock();
170	>	assertEquals(i-1,lock.getReadHoldCount());
171	>	}
172	>	}
173
174	<	public void testTryLockWhenLocked2() {
175	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
176	<	lock.writeLock().lock();
177	<	Thread t = new Thread(new Runnable() {
178	<	public void run(){
179	<	threadAssertFalse(lock.readLock().tryLock());
145	<	}
146	<	});
174	>
175	>	/**
176	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
177	>	*/
178	>	public void testUnlock_IllegalMonitorStateException() {
179	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
180		try {
181	<	t.start();
182	<	t.join();
183	<	lock.writeLock().unlock();
184	<	} catch(Exception e){
185	<	fail("unexpected exception");
153	<	}
154	<	}
181	>	rl.writeLock().unlock();
182	>	shouldThrow();
183	>	} catch (IllegalMonitorStateException success) {}
184	>	}
185	>
186
187	<	public void testMultipleReadLocks() {
188	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
189	<	lock.readLock().lock();
190	<	Thread t = new Thread(new Runnable() {
191	<	public void run(){
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	>	* 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	>	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		threadAssertTrue(lock.readLock().tryLock());
305		lock.readLock().unlock();
306	<	}
307	<	});
165	<	try {
166	<	t.start();
167	<	t.join();
168	<	lock.readLock().unlock();
169	<	} catch(Exception e){
170	<	fail("unexpected exception");
171	<	}
172	<	}
306	>	}
307	>	});
308
309	<	public void testWriteAfterMultipleReadLocks() {
310	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
311	<	lock.readLock().lock();
312	<	Thread t1 = new Thread(new Runnable() {
313	<	public void run(){
309	>	t.start();
310	>	t.join();
311	>	lock.readLock().unlock();
312	>	}
313	>
314	>	/**
315	>	* A writelock succeeds after reading threads unlock
316	>	*/
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(){
324	>	}
325	>	});
326	>	Thread t2 = new Thread(new Runnable() {
327	>	public void run() {
328		lock.writeLock().lock();
329		lock.writeLock().unlock();
330	<	}
331	<	});
330	>	}
331	>	});
332
333	<	try {
334	<	t1.start();
335	<	t2.start();
336	<	Thread.sleep(SHORT_DELAY_MS);
337	<	lock.readLock().unlock();
338	<	t1.join(MEDIUM_DELAY_MS);
339	<	t2.join(MEDIUM_DELAY_MS);
340	<	assertTrue(!t1.isAlive());
341	<	assertTrue(!t2.isAlive());
342	<
343	<	} catch(Exception e){
344	<	fail("unexpected exception");
345	<	}
346	<	}
347	<
348	<	public void testReadAfterWriteLock() {
349	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
350	<	lock.writeLock().lock();
208	<	Thread t1 = new Thread(new Runnable() {
209	<	public void run(){
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	>	/**
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(){
353	>	}
354	>	});
355	>	Thread t2 = new Thread(new Runnable() {
356	>	public void run() {
357		lock.readLock().lock();
358		lock.readLock().unlock();
359	<	}
360	<	});
359	>	}
360	>	});
361
362	<	try {
363	<	t1.start();
364	<	t2.start();
365	<	Thread.sleep(SHORT_DELAY_MS);
366	<	lock.writeLock().unlock();
367	<	t1.join(MEDIUM_DELAY_MS);
368	<	t2.join(MEDIUM_DELAY_MS);
369	<	assertTrue(!t1.isAlive());
370	<	assertTrue(!t2.isAlive());
371	<
372	<	} catch(Exception e){
373	<	fail("unexpected exception");
374	<	}
375	<	}
376	<
377	<
378	<	public void testTryLockWhenReadLocked() {
379	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
380	<	lock.readLock().lock();
381	<	Thread t = new Thread(new Runnable() {
382	<	public void run(){
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		threadAssertTrue(lock.readLock().tryLock());
615		lock.readLock().unlock();
616	<	}
617	<	});
618	<	try {
619	<	t.start();
620	<	t.join();
621	<	lock.readLock().unlock();
622	<	} catch(Exception e){
623	<	fail("unexpected exception");
252	<	}
253	<	}
616	>	}
617	>	});
618	>
619	>	t.start();
620	>	t.join();
621	>	lock.readLock().unlock();
622	>	}
623	>
624
255	–
625
626	<	public void testWriteTryLockWhenReadLocked() {
627	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
628	<	lock.readLock().lock();
629	<	Thread t = new Thread(new Runnable() {
630	<	public void run(){
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	<	});
265	<	try {
266	<	t.start();
267	<	t.join();
268	<	lock.readLock().unlock();
269	<	} catch(Exception e){
270	<	fail("unexpected exception");
271	<	}
272	<	}
635	>	}
636	>	});
637
638	<
638	>	t.start();
639	>	t.join();
640	>	lock.readLock().unlock();
641	>	}
642
276	–	public void testTryLock_Timeout(){
277	–	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
278	–	lock.writeLock().lock();
279	–	Thread t = new Thread(new Runnable() {
280	–	public void run(){
281	–	try {
282	–	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
283	–	} catch (Exception ex) {
284	–	threadFail("unexpected exception");
285	–	}
286	–	}
287	–	});
288	–	try {
289	–	t.start();
290	–	t.join();
291	–	lock.writeLock().unlock();
292	–	} catch(Exception e){
293	–	fail("unexpected exception");
294	–	}
295	–	}
643
644	<	public void testTryLock_Timeout2(){
645	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
646	<	lock.writeLock().lock();
647	<	Thread t = new Thread(new Runnable() {
648	<	public void run(){
649	<	try {
650	<	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
651	<	} catch (Exception ex) {
652	<	threadFail("unexpected exception");
653	<	}
654	<	}
655	<	});
309	<	try {
310	<	t.start();
311	<	t.join();
312	<	lock.writeLock().unlock();
313	<	} catch(Exception e){
314	<	fail("unexpected exception");
315	<	}
316	<	}
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
657	+	t.start();
658	+	t.join();
659	+	lock.readLock().unlock();
660	+	}
661
662	<	public void testLockInterruptibly() {
663	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
664	<	try {
665	<	lock.writeLock().lockInterruptibly();
666	<	} catch(Exception e) {
667	<	fail("unexpected exception");
668	<	}
669	<	Thread t = new Thread(new Runnable() {
670	<	public void run() {
671	<	try {
672	<	lock.writeLock().lockInterruptibly();
673	<	threadFail("should throw");
674	<	}
675	<	catch(InterruptedException success) {
676	<	}
677	<	}
678	<	});
336	<	try {
337	<	t.start();
338	<	t.interrupt();
339	<	t.join();
340	<	lock.writeLock().unlock();
341	<	} catch(Exception e){
342	<	fail("unexpected exception");
343	<	}
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	<	public void testLockInterruptibly2() {
682	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
683	<	try {
684	<	lock.writeLock().lockInterruptibly();
685	<	} catch(Exception e) {
686	<	fail("unexpected exception");
687	<	}
688	<	Thread t = new Thread(new Runnable() {
689	<	public void run() {
690	<	try {
691	<	lock.readLock().lockInterruptibly();
692	<	threadFail("should throw");
693	<	}
694	<	catch(InterruptedException success) {
695	<	}
696	<	}
697	<	});
363	<	try {
364	<	t.start();
365	<	t.interrupt();
366	<	t.join();
367	<	lock.writeLock().unlock();
368	<	} catch(Exception e){
369	<	fail("unexpected exception");
370	<	}
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	<	public void testAwait_IllegalMonitor() {
701	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
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	<	fail("should throw");
764	<	}
380	<	catch (IllegalMonitorStateException success) {
381	<	}
382	<	catch (Exception ex) {
383	<	fail("should throw IMSE");
384	<	}
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();
771	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
772		final Condition c = lock.writeLock().newCondition();
773		try {
774		c.signal();
775	<	fail("should throw");
776	<	}
394	<	catch (IllegalMonitorStateException success) {
395	<	}
396	<	catch (Exception ex) {
397	<	fail("should throw IMSE");
398	<	}
775	>	shouldThrow();
776	>	} catch (IllegalMonitorStateException success) {}
777		}
778
779	<	public void testAwaitNanos_Timeout() {
780	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
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	<	try {
786	<	lock.writeLock().lock();
787	<	long t = c.awaitNanos(100);
788	<	assertTrue(t <= 0);
789	<	lock.writeLock().unlock();
409	<	}
410	<	catch (Exception ex) {
411	<	fail("unexpected exception");
412	<	}
785	>
786	>	lock.writeLock().lock();
787	>	long t = c.awaitNanos(100);
788	>	assertTrue(t <= 0);
789	>	lock.writeLock().unlock();
790		}
791
792	<	public void testAwait_Timeout() {
793	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
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	<	try {
800	<	lock.writeLock().lock();
801	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
421	<	lock.writeLock().unlock();
422	<	}
423	<	catch (Exception ex) {
424	<	fail("unexpected exception");
425	<	}
799	>	lock.writeLock().lock();
800	>	assertFalse(c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
801	>	lock.writeLock().unlock();
802		}
803
804	<	public void testAwaitUntil_Timeout() {
805	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
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	<	try {
811	<	lock.writeLock().lock();
812	<	java.util.Date d = new java.util.Date();
813	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
435	<	lock.writeLock().unlock();
436	<	}
437	<	catch (Exception ex) {
438	<	fail("unexpected exception");
439	<	}
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	<	public void testAwait() {
817	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
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 Runnable() {
823	<	public void run() {
824	<	try {
825	<	lock.writeLock().lock();
826	<	c.await();
827	<	lock.writeLock().unlock();
828	<	}
829	<	catch(InterruptedException e) {
830	<	threadFail("unexpected exception");
831	<	}
832	<	}
833	<	});
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	<	try {
839	<	t.start();
840	<	Thread.sleep(SHORT_DELAY_MS);
841	<	lock.writeLock().lock();
842	<	c.signal();
843	<	lock.writeLock().unlock();
844	<	t.join(SHORT_DELAY_MS);
845	<	assertFalse(t.isAlive());
846	<	}
847	<	catch (Exception ex) {
848	<	fail("unexpected exception");
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	<	public void testAwaitUninterruptibly() {
866	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
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	<	Thread t = new Thread(new Runnable() {
872	<	public void run() {
873	<	lock.writeLock().lock();
478	<	c.awaitUninterruptibly();
479	<	lock.writeLock().unlock();
480	<	}
481	<	});
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	<	t.start();
882	<	Thread.sleep(SHORT_DELAY_MS);
486	<	t.interrupt();
487	<	lock.writeLock().lock();
881	>	thread.interrupt();
882	>	thread.canAwake = true;
883		c.signal();
884	+	} finally {
885		lock.writeLock().unlock();
490	–	t.join(SHORT_DELAY_MS);
491	–	assertFalse(t.isAlive());
492	–	}
493	–	catch (Exception ex) {
494	–	fail("unexpected exception");
886		}
887	+
888	+	thread.join();
889	+	assertTrue(thread.interrupted);
890	+	assertFalse(thread.isAlive());
891		}
892
893	<	public void testAwait_Interrupt() {
894	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
895	<	final Condition c = lock.writeLock().newCondition();
896	<	Thread t = new Thread(new Runnable() {
897	<	public void run() {
898	<	try {
899	<	lock.writeLock().lock();
900	<	c.await();
901	<	lock.writeLock().unlock();
902	<	threadFail("should throw");
903	<	}
904	<	catch(InterruptedException success) {
905	<	}
906	<	}
907	<	});
908	<
909	<	try {
910	<	t.start();
516	<	Thread.sleep(SHORT_DELAY_MS);
517	<	t.interrupt();
518	<	t.join(SHORT_DELAY_MS);
519	<	assertFalse(t.isAlive());
520	<	}
521	<	catch (Exception ex) {
522	<	fail("unexpected exception");
523	<	}
524	<	}
525	<
526	<	public void testAwaitNanos_Interrupt() {
527	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
528	<	final Condition c = lock.writeLock().newCondition();
529	<	Thread t = new Thread(new Runnable() {
530	<	public void run() {
531	<	try {
532	<	lock.writeLock().lock();
533	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
534	<	lock.writeLock().unlock();
535	<	threadFail("should throw");
536	<	}
537	<	catch(InterruptedException success) {
538	<	}
539	<	}
540	<	});
541	<
542	<	try {
543	<	t.start();
544	<	Thread.sleep(SHORT_DELAY_MS);
545	<	t.interrupt();
546	<	t.join(SHORT_DELAY_MS);
547	<	assertFalse(t.isAlive());
548	<	}
549	<	catch (Exception ex) {
550	<	fail("unexpected exception");
551	<	}
552	<	}
553	<
554	<	public void testAwaitUntil_Interrupt() {
555	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
556	<	final Condition c = lock.writeLock().newCondition();
557	<	Thread t = new Thread(new Runnable() {
558	<	public void run() {
559	<	try {
560	<	lock.writeLock().lock();
561	<	java.util.Date d = new java.util.Date();
562	<	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
563	<	lock.writeLock().unlock();
564	<	threadFail("should throw");
565	<	}
566	<	catch(InterruptedException success) {
567	<	}
568	<	}
569	<	});
570	<
571	<	try {
572	<	t.start();
573	<	Thread.sleep(SHORT_DELAY_MS);
574	<	t.interrupt();
575	<	t.join(SHORT_DELAY_MS);
576	<	assertFalse(t.isAlive());
577	<	}
578	<	catch (Exception ex) {
579	<	fail("unexpected exception");
580	<	}
581	<	}
582	<
583	<	public void testSignalAll() {
584	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
585	<	final Condition c = lock.writeLock().newCondition();
586	<	Thread t1 = new Thread(new Runnable() {
587	<	public void run() {
588	<	try {
589	<	lock.writeLock().lock();
590	<	c.await();
591	<	lock.writeLock().unlock();
592	<	}
593	<	catch(InterruptedException e) {
594	<	threadFail("unexpected exception");
595	<	}
596	<	}
597	<	});
598	<
599	<	Thread t2 = new Thread(new Runnable() {
600	<	public void run() {
601	<	try {
602	<	lock.writeLock().lock();
603	<	c.await();
604	<	lock.writeLock().unlock();
605	<	}
606	<	catch(InterruptedException e) {
607	<	threadFail("unexpected exception");
608	<	}
609	<	}
610	<	});
611	<
612	<	try {
613	<	t1.start();
614	<	t2.start();
615	<	Thread.sleep(SHORT_DELAY_MS);
616	<	lock.writeLock().lock();
617	<	c.signalAll();
618	<	lock.writeLock().unlock();
619	<	t1.join(SHORT_DELAY_MS);
620	<	t2.join(SHORT_DELAY_MS);
621	<	assertFalse(t1.isAlive());
622	<	assertFalse(t2.isAlive());
623	<	}
624	<	catch (Exception ex) {
625	<	fail("unexpected exception");
626	<	}
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	<	public void testSerialization() {
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	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1038	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1039	<	out.writeObject(l);
1040	<	out.close();
1041	<
1042	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1043	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1044	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1045	<	r.readLock().lock();
1046	<	r.readLock().unlock();
1047	<	} catch(Exception e){
1048	<	e.printStackTrace();
1049	<	fail("unexpected exception");
1050	<	}
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	+	}
1391
1392		}

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