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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 1.36 by jsr166, Sat Nov 21 02:33:20 2009 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
2	>	* Written by Doug Lea with assistance from members of JCP JSR-166
3	>	* Expert Group and released to the public domain, as explained at
4	>	* http://creativecommons.org/licenses/publicdomain
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9		import junit.framework.*;
10		import java.util.concurrent.locks.*;
11		import java.util.concurrent.*;
12	+	import static java.util.concurrent.TimeUnit.MILLISECONDS;
13		import java.io.*;
14	+	import java.util.*;
15
16		public class ReentrantReadWriteLockTest extends JSR166TestCase {
17		public static void main(String[] args) {
18	<	junit.textui.TestRunner.run (suite());
18	>	junit.textui.TestRunner.run (suite());
19		}
20		public static Test suite() {
21	<	return new TestSuite(ReentrantReadWriteLockTest.class);
21	>	return new TestSuite(ReentrantReadWriteLockTest.class);
22		}
23
24	<	static int HOLD_COUNT_TEST_LIMIT = 20;
24	>	/**
25	>	* A runnable calling lockInterruptibly
26	>	*/
27	>	class InterruptibleLockRunnable extends CheckedRunnable {
28	>	final ReentrantReadWriteLock lock;
29	>	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
30	>	public void realRun() throws InterruptedException {
31	>	lock.writeLock().lockInterruptibly();
32	>	}
33	>	}
34	>
35	>
36	>	/**
37	>	* A runnable calling lockInterruptibly that expects to be
38	>	* interrupted
39	>	*/
40	>	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
41	>	final ReentrantReadWriteLock lock;
42	>	InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
43	>	public void realRun() throws InterruptedException {
44	>	lock.writeLock().lockInterruptibly();
45	>	}
46	>	}
47	>
48	>	/**
49	>	* Subclass to expose protected methods
50	>	*/
51	>	static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
52	>	PublicReentrantReadWriteLock() { super(); }
53	>	public Collection<Thread> getQueuedThreads() {
54	>	return super.getQueuedThreads();
55	>	}
56	>	public Collection<Thread> getWaitingThreads(Condition c) {
57	>	return super.getWaitingThreads(c);
58	>	}
59	>	}
60
61	<	/*
62	<	* Unlocks an unlocked lock, throws Illegal Monitor State
25	<	*
61	>	/**
62	>	* Constructor sets given fairness, and is in unlocked state
63		*/
64	<	public void testIllegalMonitorStateException(){
65	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
66	<	try{
67	<	rl.writeLock().unlock();
68	<	fail("Should of thown Illegal Monitor State Exception");
64	>	public void testConstructor() {
65	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
66	>	assertFalse(rl.isFair());
67	>	assertFalse(rl.isWriteLocked());
68	>	assertEquals(0, rl.getReadLockCount());
69	>	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
70	>	assertTrue(r2.isFair());
71	>	assertFalse(r2.isWriteLocked());
72	>	assertEquals(0, r2.getReadLockCount());
73	>	ReentrantReadWriteLock r3 = new ReentrantReadWriteLock(false);
74	>	assertFalse(r3.isFair());
75	>	assertFalse(r3.isWriteLocked());
76	>	assertEquals(0, r3.getReadLockCount());
77	>	}
78
79	<	}catch(IllegalMonitorStateException success){}
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	<	public void testInterruptedException(){
131	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
132	<	lock.writeLock().lock();
133	<	Thread t = new Thread(new Runnable() {
134	<	public void run(){
135	<	try{
136	<	lock.writeLock().lockInterruptibly();
137	<	threadFail("should throw");
138	<	}catch(InterruptedException success){}
139	<	}
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();
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	<	t.join();
75	<	} catch(Exception e){
76	<	fail("unexpected exception");
141	>	assertEquals(i-1,lock.getWriteHoldCount());
142		}
143		}
144
145	<	public void testInterruptedException3(){
146	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
147	<	lock.writeLock().lock();
148	<	Thread t = new Thread(new Runnable() {
149	<	public void run(){
150	<	try{
151	<	lock.readLock().lockInterruptibly();
152	<	threadFail("should throw");
153	<	}catch(InterruptedException success){}
154	<	}
90	<	});
91	<	try {
92	<	t.start();
93	<	t.interrupt();
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	<	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");
156	>	assertEquals(i-1,lock.writeLock().getHoldCount());
157		}
158		}
159
160	<
161	<	public void testTryLockWhenLocked() {
162	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
163	<	lock.writeLock().lock();
164	<	Thread t = new Thread(new Runnable() {
165	<	public void run(){
166	<	threadAssertFalse(lock.writeLock().tryLock());
167	<	}
129	<	});
130	<	try {
131	<	t.start();
132	<	t.join();
133	<	lock.writeLock().unlock();
134	<	} catch(Exception e){
135	<	fail("unexpected exception");
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	<	}
169	>	for (int i = SIZE; i > 0; i--) {
170	>	lock.readLock().unlock();
171	>	assertEquals(i-1,lock.getReadHoldCount());
172	>	}
173	>	}
174
175	<	public void testTryLockWhenLocked2() {
176	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
177	<	lock.writeLock().lock();
178	<	Thread t = new Thread(new Runnable() {
179	<	public void run(){
180	<	threadAssertFalse(lock.readLock().tryLock());
145	<	}
146	<	});
175	>
176	>	/**
177	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
178	>	*/
179	>	public void testUnlock_IllegalMonitorStateException() {
180	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
181		try {
182	<	t.start();
183	<	t.join();
184	<	lock.writeLock().unlock();
185	<	} catch(Exception e){
186	<	fail("unexpected exception");
153	<	}
154	<	}
182	>	rl.writeLock().unlock();
183	>	shouldThrow();
184	>	} catch (IllegalMonitorStateException success) {}
185	>	}
186	>
187
188	<	public void testMultipleReadLocks() {
189	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
190	<	lock.readLock().lock();
191	<	Thread t = new Thread(new Runnable() {
192	<	public void run(){
188	>	/**
189	>	* write-lockInterruptibly is interruptible
190	>	*/
191	>	public void testWriteLockInterruptibly_Interrupted() throws Exception {
192	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
193	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
194	>	public void realRun() throws InterruptedException {
195	>	lock.writeLock().lockInterruptibly();
196	>	lock.writeLock().unlock();
197	>	lock.writeLock().lockInterruptibly();
198	>	lock.writeLock().unlock();
199	>	}});
200	>
201	>	lock.writeLock().lock();
202	>	t.start();
203	>	Thread.sleep(SHORT_DELAY_MS);
204	>	t.interrupt();
205	>	Thread.sleep(SHORT_DELAY_MS);
206	>	lock.writeLock().unlock();
207	>	t.join();
208	>	}
209	>
210	>	/**
211	>	* timed write-tryLock is interruptible
212	>	*/
213	>	public void testWriteTryLock_Interrupted() throws InterruptedException {
214	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
215	>	lock.writeLock().lock();
216	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
217	>	public void realRun() throws InterruptedException {
218	>	lock.writeLock().tryLock(1000,MILLISECONDS);
219	>	}});
220	>
221	>	t.start();
222	>	t.interrupt();
223	>	lock.writeLock().unlock();
224	>	t.join();
225	>	}
226	>
227	>	/**
228	>	* read-lockInterruptibly is interruptible
229	>	*/
230	>	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
231	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
232	>	lock.writeLock().lock();
233	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
234	>	public void realRun() throws InterruptedException {
235	>	lock.readLock().lockInterruptibly();
236	>	}});
237	>
238	>	t.start();
239	>	Thread.sleep(SHORT_DELAY_MS);
240	>	t.interrupt();
241	>	Thread.sleep(SHORT_DELAY_MS);
242	>	lock.writeLock().unlock();
243	>	t.join();
244	>	}
245	>
246	>	/**
247	>	* timed read-tryLock is interruptible
248	>	*/
249	>	public void testReadTryLock_Interrupted() throws InterruptedException {
250	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
251	>	lock.writeLock().lock();
252	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
253	>	public void realRun() throws InterruptedException {
254	>	lock.readLock().tryLock(1000,MILLISECONDS);
255	>	}});
256	>
257	>	t.start();
258	>	t.interrupt();
259	>	t.join();
260	>	}
261	>
262	>
263	>	/**
264	>	* write-tryLock fails if locked
265	>	*/
266	>	public void testWriteTryLockWhenLocked() throws InterruptedException {
267	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
268	>	lock.writeLock().lock();
269	>	Thread t = new Thread(new Runnable() {
270	>	public void run() {
271	>	threadAssertFalse(lock.writeLock().tryLock());
272	>	}
273	>	});
274	>
275	>	t.start();
276	>	t.join();
277	>	lock.writeLock().unlock();
278	>	}
279	>
280	>	/**
281	>	* read-tryLock fails if locked
282	>	*/
283	>	public void testReadTryLockWhenLocked() throws InterruptedException {
284	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
285	>	lock.writeLock().lock();
286	>	Thread t = new Thread(new Runnable() {
287	>	public void run() {
288	>	threadAssertFalse(lock.readLock().tryLock());
289	>	}
290	>	});
291	>
292	>	t.start();
293	>	t.join();
294	>	lock.writeLock().unlock();
295	>	}
296	>
297	>	/**
298	>	* Multiple threads can hold a read lock when not write-locked
299	>	*/
300	>	public void testMultipleReadLocks() throws InterruptedException {
301	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
302	>	lock.readLock().lock();
303	>	Thread t = new Thread(new Runnable() {
304	>	public void run() {
305		threadAssertTrue(lock.readLock().tryLock());
306		lock.readLock().unlock();
307	<	}
308	<	});
165	<	try {
166	<	t.start();
167	<	t.join();
168	<	lock.readLock().unlock();
169	<	} catch(Exception e){
170	<	fail("unexpected exception");
171	<	}
172	<	}
307	>	}
308	>	});
309
310	<	public void testWriteAfterMultipleReadLocks() {
311	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
312	<	lock.readLock().lock();
313	<	Thread t1 = new Thread(new Runnable() {
314	<	public void run(){
310	>	t.start();
311	>	t.join();
312	>	lock.readLock().unlock();
313	>	}
314	>
315	>	/**
316	>	* A writelock succeeds after reading threads unlock
317	>	*/
318	>	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
319	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
320	>	lock.readLock().lock();
321	>	Thread t1 = new Thread(new Runnable() {
322	>	public void run() {
323		lock.readLock().lock();
324		lock.readLock().unlock();
325	<	}
326	<	});
327	<	Thread t2 = new Thread(new Runnable() {
328	<	public void run(){
325	>	}
326	>	});
327	>	Thread t2 = new Thread(new Runnable() {
328	>	public void run() {
329		lock.writeLock().lock();
330		lock.writeLock().unlock();
331	<	}
332	<	});
331	>	}
332	>	});
333
334	<	try {
335	<	t1.start();
336	<	t2.start();
337	<	Thread.sleep(SHORT_DELAY_MS);
338	<	lock.readLock().unlock();
339	<	t1.join(MEDIUM_DELAY_MS);
340	<	t2.join(MEDIUM_DELAY_MS);
341	<	assertTrue(!t1.isAlive());
342	<	assertTrue(!t2.isAlive());
343	<
344	<	} catch(Exception e){
345	<	fail("unexpected exception");
346	<	}
347	<	}
348	<
349	<	public void testReadAfterWriteLock() {
350	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
351	<	lock.writeLock().lock();
208	<	Thread t1 = new Thread(new Runnable() {
209	<	public void run(){
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	>
344	>	/**
345	>	* Readlocks succeed after a writing thread unlocks
346	>	*/
347	>	public void testReadAfterWriteLock() throws InterruptedException {
348	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
349	>	lock.writeLock().lock();
350	>	Thread t1 = new Thread(new Runnable() {
351	>	public void run() {
352		lock.readLock().lock();
353		lock.readLock().unlock();
354	<	}
355	<	});
356	<	Thread t2 = new Thread(new Runnable() {
357	<	public void run(){
354	>	}
355	>	});
356	>	Thread t2 = new Thread(new Runnable() {
357	>	public void run() {
358		lock.readLock().lock();
359		lock.readLock().unlock();
360	<	}
361	<	});
360	>	}
361	>	});
362
363	<	try {
364	<	t1.start();
365	<	t2.start();
366	<	Thread.sleep(SHORT_DELAY_MS);
367	<	lock.writeLock().unlock();
368	<	t1.join(MEDIUM_DELAY_MS);
369	<	t2.join(MEDIUM_DELAY_MS);
370	<	assertTrue(!t1.isAlive());
371	<	assertTrue(!t2.isAlive());
372	<
373	<	} catch(Exception e){
374	<	fail("unexpected exception");
375	<	}
376	<	}
377	<
378	<
379	<	public void testTryLockWhenReadLocked() {
380	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
381	<	lock.readLock().lock();
382	<	Thread t = new Thread(new Runnable() {
383	<	public void run(){
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	>
373	>	/**
374	>	* Read trylock succeeds if write locked by current thread
375	>	*/
376	>	public void testReadHoldingWriteLock() {
377	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
378	>	lock.writeLock().lock();
379	>	assertTrue(lock.readLock().tryLock());
380	>	lock.readLock().unlock();
381	>	lock.writeLock().unlock();
382	>	}
383	>
384	>	/**
385	>	* Read lock succeeds if write locked by current thread even if
386	>	* other threads are waiting for readlock
387	>	*/
388	>	public void testReadHoldingWriteLock2() throws InterruptedException {
389	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
390	>	lock.writeLock().lock();
391	>	Thread t1 = new Thread(new Runnable() {
392	>	public void run() {
393	>	lock.readLock().lock();
394	>	lock.readLock().unlock();
395	>	}
396	>	});
397	>	Thread t2 = new Thread(new Runnable() {
398	>	public void run() {
399	>	lock.readLock().lock();
400	>	lock.readLock().unlock();
401	>	}
402	>	});
403	>
404	>	t1.start();
405	>	t2.start();
406	>	lock.readLock().lock();
407	>	lock.readLock().unlock();
408	>	Thread.sleep(SHORT_DELAY_MS);
409	>	lock.readLock().lock();
410	>	lock.readLock().unlock();
411	>	lock.writeLock().unlock();
412	>	t1.join(MEDIUM_DELAY_MS);
413	>	t2.join(MEDIUM_DELAY_MS);
414	>	assertTrue(!t1.isAlive());
415	>	assertTrue(!t2.isAlive());
416	>	}
417	>
418	>	/**
419	>	*  Read lock succeeds if write locked by current thread even if
420	>	* other threads are waiting for writelock
421	>	*/
422	>	public void testReadHoldingWriteLock3() throws InterruptedException {
423	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
424	>	lock.writeLock().lock();
425	>	Thread t1 = new Thread(new Runnable() {
426	>	public void run() {
427	>	lock.writeLock().lock();
428	>	lock.writeLock().unlock();
429	>	}
430	>	});
431	>	Thread t2 = new Thread(new Runnable() {
432	>	public void run() {
433	>	lock.writeLock().lock();
434	>	lock.writeLock().unlock();
435	>	}
436	>	});
437	>
438	>	t1.start();
439	>	t2.start();
440	>	lock.readLock().lock();
441	>	lock.readLock().unlock();
442	>	Thread.sleep(SHORT_DELAY_MS);
443	>	lock.readLock().lock();
444	>	lock.readLock().unlock();
445	>	lock.writeLock().unlock();
446	>	t1.join(MEDIUM_DELAY_MS);
447	>	t2.join(MEDIUM_DELAY_MS);
448	>	assertTrue(!t1.isAlive());
449	>	assertTrue(!t2.isAlive());
450	>	}
451	>
452	>
453	>	/**
454	>	*  Write lock succeeds if write locked by current thread even if
455	>	* other threads are waiting for writelock
456	>	*/
457	>	public void testWriteHoldingWriteLock4() throws InterruptedException {
458	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
459	>	lock.writeLock().lock();
460	>	Thread t1 = new Thread(new Runnable() {
461	>	public void run() {
462	>	lock.writeLock().lock();
463	>	lock.writeLock().unlock();
464	>	}
465	>	});
466	>	Thread t2 = new Thread(new Runnable() {
467	>	public void run() {
468	>	lock.writeLock().lock();
469	>	lock.writeLock().unlock();
470	>	}
471	>	});
472	>
473	>	t1.start();
474	>	t2.start();
475	>	lock.writeLock().lock();
476	>	lock.writeLock().unlock();
477	>	Thread.sleep(SHORT_DELAY_MS);
478	>	lock.writeLock().lock();
479	>	lock.writeLock().unlock();
480	>	lock.writeLock().unlock();
481	>	t1.join(MEDIUM_DELAY_MS);
482	>	t2.join(MEDIUM_DELAY_MS);
483	>	assertTrue(!t1.isAlive());
484	>	assertTrue(!t2.isAlive());
485	>	}
486	>
487	>
488	>	/**
489	>	* Fair Read trylock succeeds if write locked by current thread
490	>	*/
491	>	public void testReadHoldingWriteLockFair() {
492	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
493	>	lock.writeLock().lock();
494	>	assertTrue(lock.readLock().tryLock());
495	>	lock.readLock().unlock();
496	>	lock.writeLock().unlock();
497	>	}
498	>
499	>	/**
500	>	* Fair Read lock succeeds if write locked by current thread even if
501	>	* other threads are waiting for readlock
502	>	*/
503	>	public void testReadHoldingWriteLockFair2() throws InterruptedException {
504	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
505	>	lock.writeLock().lock();
506	>	Thread t1 = new Thread(new Runnable() {
507	>	public void run() {
508	>	lock.readLock().lock();
509	>	lock.readLock().unlock();
510	>	}
511	>	});
512	>	Thread t2 = new Thread(new Runnable() {
513	>	public void run() {
514	>	lock.readLock().lock();
515	>	lock.readLock().unlock();
516	>	}
517	>	});
518	>
519	>	t1.start();
520	>	t2.start();
521	>	lock.readLock().lock();
522	>	lock.readLock().unlock();
523	>	Thread.sleep(SHORT_DELAY_MS);
524	>	lock.readLock().lock();
525	>	lock.readLock().unlock();
526	>	lock.writeLock().unlock();
527	>	t1.join(MEDIUM_DELAY_MS);
528	>	t2.join(MEDIUM_DELAY_MS);
529	>	assertTrue(!t1.isAlive());
530	>	assertTrue(!t2.isAlive());
531	>	}
532	>
533	>
534	>	/**
535	>	* Fair Read lock succeeds if write locked by current thread even if
536	>	* other threads are waiting for writelock
537	>	*/
538	>	public void testReadHoldingWriteLockFair3() throws InterruptedException {
539	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
540	>	lock.writeLock().lock();
541	>	Thread t1 = new Thread(new Runnable() {
542	>	public void run() {
543	>	lock.writeLock().lock();
544	>	lock.writeLock().unlock();
545	>	}
546	>	});
547	>	Thread t2 = new Thread(new Runnable() {
548	>	public void run() {
549	>	lock.writeLock().lock();
550	>	lock.writeLock().unlock();
551	>	}
552	>	});
553	>
554	>	t1.start();
555	>	t2.start();
556	>	lock.readLock().lock();
557	>	lock.readLock().unlock();
558	>	Thread.sleep(SHORT_DELAY_MS);
559	>	lock.readLock().lock();
560	>	lock.readLock().unlock();
561	>	lock.writeLock().unlock();
562	>	t1.join(MEDIUM_DELAY_MS);
563	>	t2.join(MEDIUM_DELAY_MS);
564	>	assertTrue(!t1.isAlive());
565	>	assertTrue(!t2.isAlive());
566	>	}
567	>
568	>
569	>	/**
570	>	* Fair Write lock succeeds if write locked by current thread even if
571	>	* other threads are waiting for writelock
572	>	*/
573	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
574	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
575	>	lock.writeLock().lock();
576	>	Thread t1 = new Thread(new Runnable() {
577	>	public void run() {
578	>	lock.writeLock().lock();
579	>	lock.writeLock().unlock();
580	>	}
581	>	});
582	>	Thread t2 = new Thread(new Runnable() {
583	>	public void run() {
584	>	lock.writeLock().lock();
585	>	lock.writeLock().unlock();
586	>	}
587	>	});
588	>
589	>	t1.start();
590	>	t2.start();
591	>	Thread.sleep(SHORT_DELAY_MS);
592	>	assertTrue(lock.isWriteLockedByCurrentThread());
593	>	assertTrue(lock.getWriteHoldCount() == 1);
594	>	lock.writeLock().lock();
595	>	assertTrue(lock.getWriteHoldCount() == 2);
596	>	lock.writeLock().unlock();
597	>	lock.writeLock().lock();
598	>	lock.writeLock().unlock();
599	>	lock.writeLock().unlock();
600	>	t1.join(MEDIUM_DELAY_MS);
601	>	t2.join(MEDIUM_DELAY_MS);
602	>	assertTrue(!t1.isAlive());
603	>	assertTrue(!t2.isAlive());
604	>	}
605	>
606	>
607	>	/**
608	>	* Read tryLock succeeds if readlocked but not writelocked
609	>	*/
610	>	public void testTryLockWhenReadLocked() throws InterruptedException {
611	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
612	>	lock.readLock().lock();
613	>	Thread t = new Thread(new Runnable() {
614	>	public void run() {
615		threadAssertTrue(lock.readLock().tryLock());
616		lock.readLock().unlock();
617	<	}
618	<	});
619	<	try {
620	<	t.start();
621	<	t.join();
622	<	lock.readLock().unlock();
623	<	} catch(Exception e){
624	<	fail("unexpected exception");
252	<	}
253	<	}
617	>	}
618	>	});
619	>
620	>	t.start();
621	>	t.join();
622	>	lock.readLock().unlock();
623	>	}
624	>
625
255	–
626
627	<	public void testWriteTryLockWhenReadLocked() {
628	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
629	<	lock.readLock().lock();
630	<	Thread t = new Thread(new Runnable() {
631	<	public void run(){
627	>	/**
628	>	* write tryLock fails when readlocked
629	>	*/
630	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
631	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
632	>	lock.readLock().lock();
633	>	Thread t = new Thread(new Runnable() {
634	>	public void run() {
635		threadAssertFalse(lock.writeLock().tryLock());
636	<	}
637	<	});
265	<	try {
266	<	t.start();
267	<	t.join();
268	<	lock.readLock().unlock();
269	<	} catch(Exception e){
270	<	fail("unexpected exception");
271	<	}
272	<	}
636	>	}
637	>	});
638
639	<
639	>	t.start();
640	>	t.join();
641	>	lock.readLock().unlock();
642	>	}
643
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	–	}
644
645	<	public void testTryLock_Timeout2(){
646	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
647	<	lock.writeLock().lock();
648	<	Thread t = new Thread(new Runnable() {
649	<	public void run(){
650	<	try {
651	<	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
652	<	} catch (Exception ex) {
653	<	threadFail("unexpected exception");
654	<	}
655	<	}
656	<	});
309	<	try {
310	<	t.start();
311	<	t.join();
312	<	lock.writeLock().unlock();
313	<	} catch(Exception e){
314	<	fail("unexpected exception");
315	<	}
316	<	}
645	>	/**
646	>	* Fair Read tryLock succeeds if readlocked but not writelocked
647	>	*/
648	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
649	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
650	>	lock.readLock().lock();
651	>	Thread t = new Thread(new Runnable() {
652	>	public void run() {
653	>	threadAssertTrue(lock.readLock().tryLock());
654	>	lock.readLock().unlock();
655	>	}
656	>	});
657
658	+	t.start();
659	+	t.join();
660	+	lock.readLock().unlock();
661	+	}
662
663	<	public void testLockInterruptibly() {
664	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
665	<	try {
666	<	lock.writeLock().lockInterruptibly();
667	<	} catch(Exception e) {
668	<	fail("unexpected exception");
669	<	}
670	<	Thread t = new Thread(new Runnable() {
671	<	public void run() {
672	<	try {
673	<	lock.writeLock().lockInterruptibly();
674	<	threadFail("should throw");
675	<	}
676	<	catch(InterruptedException success) {
677	<	}
678	<	}
679	<	});
336	<	try {
337	<	t.start();
338	<	t.interrupt();
339	<	t.join();
340	<	lock.writeLock().unlock();
341	<	} catch(Exception e){
342	<	fail("unexpected exception");
343	<	}
663	>
664	>
665	>	/**
666	>	* Fair write tryLock fails when readlocked
667	>	*/
668	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
669	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
670	>	lock.readLock().lock();
671	>	Thread t = new Thread(new Runnable() {
672	>	public void run() {
673	>	threadAssertFalse(lock.writeLock().tryLock());
674	>	}
675	>	});
676	>
677	>	t.start();
678	>	t.join();
679	>	lock.readLock().unlock();
680		}
681
682	<	public void testLockInterruptibly2() {
683	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
684	<	try {
685	<	lock.writeLock().lockInterruptibly();
686	<	} catch(Exception e) {
687	<	fail("unexpected exception");
688	<	}
689	<	Thread t = new Thread(new Runnable() {
690	<	public void run() {
691	<	try {
692	<	lock.readLock().lockInterruptibly();
693	<	threadFail("should throw");
694	<	}
695	<	catch(InterruptedException success) {
696	<	}
697	<	}
698	<	});
363	<	try {
364	<	t.start();
365	<	t.interrupt();
366	<	t.join();
367	<	lock.writeLock().unlock();
368	<	} catch(Exception e){
369	<	fail("unexpected exception");
370	<	}
682	>
683	>
684	>	/**
685	>	* write timed tryLock times out if locked
686	>	*/
687	>	public void testWriteTryLock_Timeout() throws InterruptedException {
688	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
689	>	lock.writeLock().lock();
690	>	Thread t = new Thread(new CheckedRunnable() {
691	>	public void realRun() throws InterruptedException {
692	>	threadAssertFalse(lock.writeLock().tryLock(1, MILLISECONDS));
693	>	}});
694	>
695	>	t.start();
696	>	t.join();
697	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
698	>	lock.writeLock().unlock();
699		}
700
701	<	public void testAwait_IllegalMonitor() {
702	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
701	>	/**
702	>	* read timed tryLock times out if write-locked
703	>	*/
704	>	public void testReadTryLock_Timeout() throws InterruptedException {
705	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
706	>	lock.writeLock().lock();
707	>	Thread t = new Thread(new CheckedRunnable() {
708	>	public void realRun() throws InterruptedException {
709	>	threadAssertFalse(lock.readLock().tryLock(1, MILLISECONDS));
710	>	}});
711	>
712	>	t.start();
713	>	t.join();
714	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
715	>	lock.writeLock().unlock();
716	>	}
717	>
718	>
719	>	/**
720	>	* write lockInterruptibly succeeds if lock free else is interruptible
721	>	*/
722	>	public void testWriteLockInterruptibly() throws InterruptedException {
723	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
724	>	lock.writeLock().lockInterruptibly();
725	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
726	>	public void realRun() throws InterruptedException {
727	>	lock.writeLock().lockInterruptibly();
728	>	}});
729	>
730	>	t.start();
731	>	Thread.sleep(SHORT_DELAY_MS);
732	>	t.interrupt();
733	>	Thread.sleep(SHORT_DELAY_MS);
734	>	t.join();
735	>	lock.writeLock().unlock();
736	>	}
737	>
738	>	/**
739	>	*  read lockInterruptibly succeeds if lock free else is interruptible
740	>	*/
741	>	public void testReadLockInterruptibly() throws InterruptedException {
742	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
743	>	lock.writeLock().lockInterruptibly();
744	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
745	>	public void realRun() throws InterruptedException {
746	>	lock.readLock().lockInterruptibly();
747	>	}});
748	>
749	>	t.start();
750	>	Thread.sleep(SHORT_DELAY_MS);
751	>	t.interrupt();
752	>	t.join();
753	>	lock.writeLock().unlock();
754	>	}
755	>
756	>	/**
757	>	* Calling await without holding lock throws IllegalMonitorStateException
758	>	*/
759	>	public void testAwait_IllegalMonitor() throws InterruptedException {
760	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
761		final Condition c = lock.writeLock().newCondition();
762		try {
763		c.await();
764	<	fail("should throw");
765	<	}
380	<	catch (IllegalMonitorStateException success) {
381	<	}
382	<	catch (Exception ex) {
383	<	fail("should throw IMSE");
384	<	}
764	>	shouldThrow();
765	>	} catch (IllegalMonitorStateException success) {}
766		}
767
768	+	/**
769	+	* Calling signal without holding lock throws IllegalMonitorStateException
770	+	*/
771		public void testSignal_IllegalMonitor() {
772	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
772	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
773		final Condition c = lock.writeLock().newCondition();
774		try {
775		c.signal();
776	<	fail("should throw");
777	<	}
394	<	catch (IllegalMonitorStateException success) {
395	<	}
396	<	catch (Exception ex) {
397	<	fail("should throw IMSE");
398	<	}
776	>	shouldThrow();
777	>	} catch (IllegalMonitorStateException success) {}
778		}
779
780	<	public void testAwaitNanos_Timeout() {
781	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
780	>	/**
781	>	* awaitNanos without a signal times out
782	>	*/
783	>	public void testAwaitNanos_Timeout() throws InterruptedException {
784	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
785		final Condition c = lock.writeLock().newCondition();
786	<	try {
787	<	lock.writeLock().lock();
788	<	long t = c.awaitNanos(100);
789	<	assertTrue(t <= 0);
790	<	lock.writeLock().unlock();
409	<	}
410	<	catch (Exception ex) {
411	<	fail("unexpected exception");
412	<	}
786	>
787	>	lock.writeLock().lock();
788	>	long t = c.awaitNanos(100);
789	>	assertTrue(t <= 0);
790	>	lock.writeLock().unlock();
791		}
792
793	<	public void testAwait_Timeout() {
794	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
793	>
794	>	/**
795	>	*  timed await without a signal times out
796	>	*/
797	>	public void testAwait_Timeout() throws InterruptedException {
798	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
799		final Condition c = lock.writeLock().newCondition();
800	<	try {
801	<	lock.writeLock().lock();
802	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
421	<	lock.writeLock().unlock();
422	<	}
423	<	catch (Exception ex) {
424	<	fail("unexpected exception");
425	<	}
800	>	lock.writeLock().lock();
801	>	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
802	>	lock.writeLock().unlock();
803		}
804
805	<	public void testAwaitUntil_Timeout() {
806	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
805	>	/**
806	>	* awaitUntil without a signal times out
807	>	*/
808	>	public void testAwaitUntil_Timeout() throws InterruptedException {
809	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
810		final Condition c = lock.writeLock().newCondition();
811	<	try {
812	<	lock.writeLock().lock();
813	<	java.util.Date d = new java.util.Date();
814	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
435	<	lock.writeLock().unlock();
436	<	}
437	<	catch (Exception ex) {
438	<	fail("unexpected exception");
439	<	}
811	>	lock.writeLock().lock();
812	>	java.util.Date d = new java.util.Date();
813	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
814	>	lock.writeLock().unlock();
815		}
816
817	<	public void testAwait() {
818	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
817	>	/**
818	>	* await returns when signalled
819	>	*/
820	>	public void testAwait() throws InterruptedException {
821	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
822		final Condition c = lock.writeLock().newCondition();
823	<	Thread t = new Thread(new Runnable() {
824	<	public void run() {
825	<	try {
826	<	lock.writeLock().lock();
827	<	c.await();
828	<	lock.writeLock().unlock();
829	<	}
830	<	catch(InterruptedException e) {
831	<	threadFail("unexpected exception");
832	<	}
833	<	}
834	<	});
823	>	Thread t = new Thread(new CheckedRunnable() {
824	>	public void realRun() throws InterruptedException {
825	>	lock.writeLock().lock();
826	>	c.await();
827	>	lock.writeLock().unlock();
828	>	}});
829	>
830	>	t.start();
831	>	Thread.sleep(SHORT_DELAY_MS);
832	>	lock.writeLock().lock();
833	>	c.signal();
834	>	lock.writeLock().unlock();
835	>	t.join(SHORT_DELAY_MS);
836	>	assertFalse(t.isAlive());
837	>	}
838
839	<	try {
840	<	t.start();
841	<	Thread.sleep(SHORT_DELAY_MS);
842	<	lock.writeLock().lock();
843	<	c.signal();
844	<	lock.writeLock().unlock();
845	<	t.join(SHORT_DELAY_MS);
846	<	assertFalse(t.isAlive());
847	<	}
848	<	catch (Exception ex) {
849	<	fail("unexpected exception");
839	>	/** A helper class for uninterruptible wait tests */
840	>	class UninterruptableThread extends Thread {
841	>	private Lock lock;
842	>	private Condition c;
843	>
844	>	public volatile boolean canAwake = false;
845	>	public volatile boolean interrupted = false;
846	>	public volatile boolean lockStarted = false;
847	>
848	>	public UninterruptableThread(Lock lock, Condition c) {
849	>	this.lock = lock;
850	>	this.c = c;
851	>	}
852	>
853	>	public synchronized void run() {
854	>	lock.lock();
855	>	lockStarted = true;
856	>
857	>	while (!canAwake) {
858	>	c.awaitUninterruptibly();
859	>	}
860	>
861	>	interrupted = isInterrupted();
862	>	lock.unlock();
863		}
864		}
865
866	<	public void testAwaitUninterruptibly() {
867	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
866	>	/**
867	>	* awaitUninterruptibly doesn't abort on interrupt
868	>	*/
869	>	public void testAwaitUninterruptibly() throws InterruptedException {
870	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
871		final Condition c = lock.writeLock().newCondition();
872	<	Thread t = new Thread(new Runnable() {
873	<	public void run() {
874	<	lock.writeLock().lock();
478	<	c.awaitUninterruptibly();
479	<	lock.writeLock().unlock();
480	<	}
481	<	});
872	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
873	>
874	>	thread.start();
875
876	+	while (!thread.lockStarted) {
877	+	Thread.sleep(100);
878	+	}
879	+
880	+	lock.writeLock().lock();
881		try {
882	<	t.start();
883	<	Thread.sleep(SHORT_DELAY_MS);
486	<	t.interrupt();
487	<	lock.writeLock().lock();
882	>	thread.interrupt();
883	>	thread.canAwake = true;
884		c.signal();
885	+	} finally {
886		lock.writeLock().unlock();
490	–	t.join(SHORT_DELAY_MS);
491	–	assertFalse(t.isAlive());
492	–	}
493	–	catch (Exception ex) {
494	–	fail("unexpected exception");
887		}
888	+
889	+	thread.join();
890	+	assertTrue(thread.interrupted);
891	+	assertFalse(thread.isAlive());
892		}
893
894	<	public void testAwait_Interrupt() {
895	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
896	<	final Condition c = lock.writeLock().newCondition();
897	<	Thread t = new Thread(new Runnable() {
898	<	public void run() {
899	<	try {
900	<	lock.writeLock().lock();
901	<	c.await();
902	<	lock.writeLock().unlock();
903	<	threadFail("should throw");
904	<	}
905	<	catch(InterruptedException success) {
906	<	}
907	<	}
908	<	});
909	<
910	<	try {
911	<	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	<	}
894	>	/**
895	>	* await is interruptible
896	>	*/
897	>	public void testAwait_Interrupt() throws InterruptedException {
898	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
899	>	final Condition c = lock.writeLock().newCondition();
900	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
901	>	public void realRun() throws InterruptedException {
902	>	lock.writeLock().lock();
903	>	c.await();
904	>	lock.writeLock().unlock();
905	>	}});
906	>
907	>	t.start();
908	>	Thread.sleep(SHORT_DELAY_MS);
909	>	t.interrupt();
910	>	t.join(SHORT_DELAY_MS);
911	>	assertFalse(t.isAlive());
912		}
913
914	<	public void testSerialization() {
914	>	/**
915	>	* awaitNanos is interruptible
916	>	*/
917	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
918	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
919	>	final Condition c = lock.writeLock().newCondition();
920	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
921	>	public void realRun() throws InterruptedException {
922	>	lock.writeLock().lock();
923	>	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
924	>	lock.writeLock().unlock();
925	>	}});
926	>
927	>	t.start();
928	>	Thread.sleep(SHORT_DELAY_MS);
929	>	t.interrupt();
930	>	t.join(SHORT_DELAY_MS);
931	>	assertFalse(t.isAlive());
932	>	}
933	>
934	>	/**
935	>	* awaitUntil is interruptible
936	>	*/
937	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
938	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
939	>	final Condition c = lock.writeLock().newCondition();
940	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
941	>	public void realRun() throws InterruptedException {
942	>	lock.writeLock().lock();
943	>	java.util.Date d = new java.util.Date();
944	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
945	>	lock.writeLock().unlock();
946	>	}});
947	>
948	>	t.start();
949	>	Thread.sleep(SHORT_DELAY_MS);
950	>	t.interrupt();
951	>	t.join(SHORT_DELAY_MS);
952	>	assertFalse(t.isAlive());
953	>	}
954	>
955	>	/**
956	>	* signalAll wakes up all threads
957	>	*/
958	>	public void testSignalAll() throws InterruptedException {
959	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
960	>	final Condition c = lock.writeLock().newCondition();
961	>	Thread t1 = new Thread(new CheckedRunnable() {
962	>	public void realRun() throws InterruptedException {
963	>	lock.writeLock().lock();
964	>	c.await();
965	>	lock.writeLock().unlock();
966	>	}});
967	>
968	>	Thread t2 = new Thread(new CheckedRunnable() {
969	>	public void realRun() throws InterruptedException {
970	>	lock.writeLock().lock();
971	>	c.await();
972	>	lock.writeLock().unlock();
973	>	}});
974	>
975	>	t1.start();
976	>	t2.start();
977	>	Thread.sleep(SHORT_DELAY_MS);
978	>	lock.writeLock().lock();
979	>	c.signalAll();
980	>	lock.writeLock().unlock();
981	>	t1.join(SHORT_DELAY_MS);
982	>	t2.join(SHORT_DELAY_MS);
983	>	assertFalse(t1.isAlive());
984	>	assertFalse(t2.isAlive());
985	>	}
986	>
987	>	/**
988	>	* A serialized lock deserializes as unlocked
989	>	*/
990	>	public void testSerialization() throws Exception {
991		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
992		l.readLock().lock();
993		l.readLock().unlock();
994
995	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
996	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
997	+	out.writeObject(l);
998	+	out.close();
999	+
1000	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1001	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1002	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1003	+	r.readLock().lock();
1004	+	r.readLock().unlock();
1005	+	}
1006	+
1007	+	/**
1008	+	* hasQueuedThreads reports whether there are waiting threads
1009	+	*/
1010	+	public void testhasQueuedThreads() throws InterruptedException {
1011	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1012	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1013	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1014	+	assertFalse(lock.hasQueuedThreads());
1015	+	lock.writeLock().lock();
1016	+	t1.start();
1017	+	Thread.sleep(SHORT_DELAY_MS);
1018	+	assertTrue(lock.hasQueuedThreads());
1019	+	t2.start();
1020	+	Thread.sleep(SHORT_DELAY_MS);
1021	+	assertTrue(lock.hasQueuedThreads());
1022	+	t1.interrupt();
1023	+	Thread.sleep(SHORT_DELAY_MS);
1024	+	assertTrue(lock.hasQueuedThreads());
1025	+	lock.writeLock().unlock();
1026	+	Thread.sleep(SHORT_DELAY_MS);
1027	+	assertFalse(lock.hasQueuedThreads());
1028	+	t1.join();
1029	+	t2.join();
1030	+	}
1031	+
1032	+	/**
1033	+	* hasQueuedThread(null) throws NPE
1034	+	*/
1035	+	public void testHasQueuedThreadNPE() {
1036	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1037		try {
1038	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1039	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1040	<	out.writeObject(l);
1041	<	out.close();
1042	<
1043	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1044	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1045	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1046	<	r.readLock().lock();
1047	<	r.readLock().unlock();
1048	<	} catch(Exception e){
1049	<	e.printStackTrace();
1050	<	fail("unexpected exception");
1051	<	}
1038	>	sync.hasQueuedThread(null);
1039	>	shouldThrow();
1040	>	} catch (NullPointerException success) {}
1041	>	}
1042	>
1043	>	/**
1044	>	* hasQueuedThread reports whether a thread is queued.
1045	>	*/
1046	>	public void testHasQueuedThread() throws InterruptedException {
1047	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1048	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1049	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1050	>	assertFalse(sync.hasQueuedThread(t1));
1051	>	assertFalse(sync.hasQueuedThread(t2));
1052	>	sync.writeLock().lock();
1053	>	t1.start();
1054	>	Thread.sleep(SHORT_DELAY_MS);
1055	>	assertTrue(sync.hasQueuedThread(t1));
1056	>	t2.start();
1057	>	Thread.sleep(SHORT_DELAY_MS);
1058	>	assertTrue(sync.hasQueuedThread(t1));
1059	>	assertTrue(sync.hasQueuedThread(t2));
1060	>	t1.interrupt();
1061	>	Thread.sleep(SHORT_DELAY_MS);
1062	>	assertFalse(sync.hasQueuedThread(t1));
1063	>	assertTrue(sync.hasQueuedThread(t2));
1064	>	sync.writeLock().unlock();
1065	>	Thread.sleep(SHORT_DELAY_MS);
1066	>	assertFalse(sync.hasQueuedThread(t1));
1067	>	Thread.sleep(SHORT_DELAY_MS);
1068	>	assertFalse(sync.hasQueuedThread(t2));
1069	>	t1.join();
1070	>	t2.join();
1071	>	}
1072	>
1073	>
1074	>	/**
1075	>	* getQueueLength reports number of waiting threads
1076	>	*/
1077	>	public void testGetQueueLength() throws InterruptedException {
1078	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1079	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1080	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1081	>	assertEquals(0, lock.getQueueLength());
1082	>	lock.writeLock().lock();
1083	>	t1.start();
1084	>	Thread.sleep(SHORT_DELAY_MS);
1085	>	assertEquals(1, lock.getQueueLength());
1086	>	t2.start();
1087	>	Thread.sleep(SHORT_DELAY_MS);
1088	>	assertEquals(2, lock.getQueueLength());
1089	>	t1.interrupt();
1090	>	Thread.sleep(SHORT_DELAY_MS);
1091	>	assertEquals(1, lock.getQueueLength());
1092	>	lock.writeLock().unlock();
1093	>	Thread.sleep(SHORT_DELAY_MS);
1094	>	assertEquals(0, lock.getQueueLength());
1095	>	t1.join();
1096	>	t2.join();
1097	>	}
1098	>
1099	>	/**
1100	>	* getQueuedThreads includes waiting threads
1101	>	*/
1102	>	public void testGetQueuedThreads() throws InterruptedException {
1103	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1104	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1105	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1106	>	assertTrue(lock.getQueuedThreads().isEmpty());
1107	>	lock.writeLock().lock();
1108	>	assertTrue(lock.getQueuedThreads().isEmpty());
1109	>	t1.start();
1110	>	Thread.sleep(SHORT_DELAY_MS);
1111	>	assertTrue(lock.getQueuedThreads().contains(t1));
1112	>	t2.start();
1113	>	Thread.sleep(SHORT_DELAY_MS);
1114	>	assertTrue(lock.getQueuedThreads().contains(t1));
1115	>	assertTrue(lock.getQueuedThreads().contains(t2));
1116	>	t1.interrupt();
1117	>	Thread.sleep(SHORT_DELAY_MS);
1118	>	assertFalse(lock.getQueuedThreads().contains(t1));
1119	>	assertTrue(lock.getQueuedThreads().contains(t2));
1120	>	lock.writeLock().unlock();
1121	>	Thread.sleep(SHORT_DELAY_MS);
1122	>	assertTrue(lock.getQueuedThreads().isEmpty());
1123	>	t1.join();
1124	>	t2.join();
1125	>	}
1126	>
1127	>	/**
1128	>	* hasWaiters throws NPE if null
1129	>	*/
1130	>	public void testHasWaitersNPE() {
1131	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1132	>	try {
1133	>	lock.hasWaiters(null);
1134	>	shouldThrow();
1135	>	} catch (NullPointerException success) {}
1136	>	}
1137	>
1138	>	/**
1139	>	* getWaitQueueLength throws NPE if null
1140	>	*/
1141	>	public void testGetWaitQueueLengthNPE() {
1142	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1143	>	try {
1144	>	lock.getWaitQueueLength(null);
1145	>	shouldThrow();
1146	>	} catch (NullPointerException success) {}
1147	>	}
1148	>
1149	>
1150	>	/**
1151	>	* getWaitingThreads throws NPE if null
1152	>	*/
1153	>	public void testGetWaitingThreadsNPE() {
1154	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1155	>	try {
1156	>	lock.getWaitingThreads(null);
1157	>	shouldThrow();
1158	>	} catch (NullPointerException success) {}
1159	>	}
1160	>
1161	>	/**
1162	>	* hasWaiters throws IAE if not owned
1163	>	*/
1164	>	public void testHasWaitersIAE() {
1165	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1166	>	final Condition c = lock.writeLock().newCondition();
1167	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1168	>	try {
1169	>	lock2.hasWaiters(c);
1170	>	shouldThrow();
1171	>	} catch (IllegalArgumentException success) {}
1172	>	}
1173	>
1174	>	/**
1175	>	* hasWaiters throws IMSE if not locked
1176	>	*/
1177	>	public void testHasWaitersIMSE() {
1178	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1179	>	final Condition c = lock.writeLock().newCondition();
1180	>	try {
1181	>	lock.hasWaiters(c);
1182	>	shouldThrow();
1183	>	} catch (IllegalMonitorStateException success) {}
1184	>	}
1185	>
1186	>
1187	>	/**
1188	>	* getWaitQueueLength throws IAE if not owned
1189	>	*/
1190	>	public void testGetWaitQueueLengthIAE() {
1191	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1192	>	final Condition c = lock.writeLock().newCondition();
1193	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1194	>	try {
1195	>	lock2.getWaitQueueLength(c);
1196	>	shouldThrow();
1197	>	} catch (IllegalArgumentException success) {}
1198	>	}
1199	>
1200	>	/**
1201	>	* getWaitQueueLength throws IMSE if not locked
1202	>	*/
1203	>	public void testGetWaitQueueLengthIMSE() {
1204	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1205	>	final Condition c = lock.writeLock().newCondition();
1206	>	try {
1207	>	lock.getWaitQueueLength(c);
1208	>	shouldThrow();
1209	>	} catch (IllegalMonitorStateException success) {}
1210	>	}
1211	>
1212	>
1213	>	/**
1214	>	* getWaitingThreads throws IAE if not owned
1215	>	*/
1216	>	public void testGetWaitingThreadsIAE() {
1217	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1218	>	final Condition c = lock.writeLock().newCondition();
1219	>	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1220	>	try {
1221	>	lock2.getWaitingThreads(c);
1222	>	shouldThrow();
1223	>	} catch (IllegalArgumentException success) {}
1224	>	}
1225	>
1226	>	/**
1227	>	* getWaitingThreads throws IMSE if not locked
1228	>	*/
1229	>	public void testGetWaitingThreadsIMSE() {
1230	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1231	>	final Condition c = lock.writeLock().newCondition();
1232	>	try {
1233	>	lock.getWaitingThreads(c);
1234	>	shouldThrow();
1235	>	} catch (IllegalMonitorStateException success) {}
1236	>	}
1237	>
1238	>
1239	>	/**
1240	>	* hasWaiters returns true when a thread is waiting, else false
1241	>	*/
1242	>	public void testHasWaiters() throws InterruptedException {
1243	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1244	>	final Condition c = lock.writeLock().newCondition();
1245	>	Thread t = new Thread(new CheckedRunnable() {
1246	>	public void realRun() throws InterruptedException {
1247	>	lock.writeLock().lock();
1248	>	threadAssertFalse(lock.hasWaiters(c));
1249	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1250	>	c.await();
1251	>	lock.writeLock().unlock();
1252	>	}});
1253	>
1254	>	t.start();
1255	>	Thread.sleep(SHORT_DELAY_MS);
1256	>	lock.writeLock().lock();
1257	>	assertTrue(lock.hasWaiters(c));
1258	>	assertEquals(1, lock.getWaitQueueLength(c));
1259	>	c.signal();
1260	>	lock.writeLock().unlock();
1261	>	Thread.sleep(SHORT_DELAY_MS);
1262	>	lock.writeLock().lock();
1263	>	assertFalse(lock.hasWaiters(c));
1264	>	assertEquals(0, lock.getWaitQueueLength(c));
1265	>	lock.writeLock().unlock();
1266	>	t.join(SHORT_DELAY_MS);
1267	>	assertFalse(t.isAlive());
1268		}
1269
1270	+	/**
1271	+	* getWaitQueueLength returns number of waiting threads
1272	+	*/
1273	+	public void testGetWaitQueueLength() throws InterruptedException {
1274	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1275	+	final Condition c = lock.writeLock().newCondition();
1276	+	Thread t = new Thread(new CheckedRunnable() {
1277	+	public void realRun() throws InterruptedException {
1278	+	lock.writeLock().lock();
1279	+	threadAssertFalse(lock.hasWaiters(c));
1280	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1281	+	c.await();
1282	+	lock.writeLock().unlock();
1283	+	}});
1284	+
1285	+	t.start();
1286	+	Thread.sleep(SHORT_DELAY_MS);
1287	+	lock.writeLock().lock();
1288	+	assertTrue(lock.hasWaiters(c));
1289	+	assertEquals(1, lock.getWaitQueueLength(c));
1290	+	c.signal();
1291	+	lock.writeLock().unlock();
1292	+	Thread.sleep(SHORT_DELAY_MS);
1293	+	lock.writeLock().lock();
1294	+	assertFalse(lock.hasWaiters(c));
1295	+	assertEquals(0, lock.getWaitQueueLength(c));
1296	+	lock.writeLock().unlock();
1297	+	t.join(SHORT_DELAY_MS);
1298	+	assertFalse(t.isAlive());
1299	+	}
1300	+
1301	+
1302	+	/**
1303	+	* getWaitingThreads returns only and all waiting threads
1304	+	*/
1305	+	public void testGetWaitingThreads() throws InterruptedException {
1306	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1307	+	final Condition c = lock.writeLock().newCondition();
1308	+	Thread t1 = new Thread(new CheckedRunnable() {
1309	+	public void realRun() throws InterruptedException {
1310	+	lock.writeLock().lock();
1311	+	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1312	+	c.await();
1313	+	lock.writeLock().unlock();
1314	+	}});
1315	+
1316	+	Thread t2 = new Thread(new CheckedRunnable() {
1317	+	public void realRun() throws InterruptedException {
1318	+	lock.writeLock().lock();
1319	+	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1320	+	c.await();
1321	+	lock.writeLock().unlock();
1322	+	}});
1323	+
1324	+	lock.writeLock().lock();
1325	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1326	+	lock.writeLock().unlock();
1327	+	t1.start();
1328	+	Thread.sleep(SHORT_DELAY_MS);
1329	+	t2.start();
1330	+	Thread.sleep(SHORT_DELAY_MS);
1331	+	lock.writeLock().lock();
1332	+	assertTrue(lock.hasWaiters(c));
1333	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1334	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1335	+	c.signalAll();
1336	+	lock.writeLock().unlock();
1337	+	Thread.sleep(SHORT_DELAY_MS);
1338	+	lock.writeLock().lock();
1339	+	assertFalse(lock.hasWaiters(c));
1340	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1341	+	lock.writeLock().unlock();
1342	+	t1.join(SHORT_DELAY_MS);
1343	+	t2.join(SHORT_DELAY_MS);
1344	+	assertFalse(t1.isAlive());
1345	+	assertFalse(t2.isAlive());
1346	+	}
1347	+
1348	+	/**
1349	+	* toString indicates current lock state
1350	+	*/
1351	+	public void testToString() {
1352	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1353	+	String us = lock.toString();
1354	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1355	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1356	+	lock.writeLock().lock();
1357	+	String ws = lock.toString();
1358	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1359	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1360	+	lock.writeLock().unlock();
1361	+	lock.readLock().lock();
1362	+	lock.readLock().lock();
1363	+	String rs = lock.toString();
1364	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1365	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1366	+	}
1367	+
1368	+	/**
1369	+	* readLock.toString indicates current lock state
1370	+	*/
1371	+	public void testReadLockToString() {
1372	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1373	+	String us = lock.readLock().toString();
1374	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1375	+	lock.readLock().lock();
1376	+	lock.readLock().lock();
1377	+	String rs = lock.readLock().toString();
1378	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1379	+	}
1380	+
1381	+	/**
1382	+	* writeLock.toString indicates current lock state
1383	+	*/
1384	+	public void testWriteLockToString() {
1385	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1386	+	String us = lock.writeLock().toString();
1387	+	assertTrue(us.indexOf("Unlocked") >= 0);
1388	+	lock.writeLock().lock();
1389	+	String ls = lock.writeLock().toString();
1390	+	assertTrue(ls.indexOf("Locked") >= 0);
1391	+	}
1392
1393		}

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