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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.2 by dl, Sun Sep 7 20:39:11 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 TestCase {
14	<	static int HOLD_COUNT_TEST_LIMIT = 20;
15	<
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	–
19		public static Test suite() {
20	<	return new TestSuite(ReentrantReadWriteLockTest.class);
20	>	return new TestSuite(ReentrantReadWriteLockTest.class);
21		}
22
23	+	/**
24	+	* A runnable calling lockInterruptibly
25	+	*/
26	+	class InterruptibleLockRunnable extends CheckedRunnable {
27	+	final ReentrantReadWriteLock lock;
28	+	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
29	+	public void realRun() throws InterruptedException {
30	+	lock.writeLock().lockInterruptibly();
31	+	}
32	+	}
33
25	–	private static long SHORT_DELAY_MS = 100;
26	–	private static long MEDIUM_DELAY_MS = 1000;
27	–	private static long LONG_DELAY_MS = 10000;
34
35	<	/*
36	<	* Unlocks an unlocked lock, throws Illegal Monitor State
37	<	*
35	>	/**
36	>	* A runnable calling lockInterruptibly that expects to be
37	>	* interrupted
38		*/
39	<
40	<	public void testIllegalMonitorStateException(){
41	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
42	<	try{
43	<	rl.writeLock().unlock();
44	<	fail("Should of thown Illegal Monitor State Exception");
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	<	}catch(IllegalMonitorStateException success){}
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	+	* Constructor sets given fairness, and is in unlocked state
62	+	*/
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	+	/**
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	<	public void testInterruptedException(){
104	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
105	<	lock.writeLock().lock();
106	<	Thread t = new Thread(new Runnable() {
107	<	public void run(){
108	<	try{
109	<	lock.writeLock().lockInterruptibly();
110	<	fail("should throw");
111	<	}catch(InterruptedException success){}
112	<	}
113	<	});
114	<	try {
115	<	t.start();
116	<	t.interrupt();
117	<	lock.writeLock().unlock();
118	<	t.join();
119	<	} catch(Exception e){
120	<	fail("unexpected exception");
121	<	}
122	<	}
123	<
124	<	public void testInterruptedException2(){
125	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
126	<	lock.writeLock().lock();
127	<	Thread t = new Thread(new Runnable() {
128	<	public void run(){
129	<	try{
130	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
131	<	fail("should throw");
132	<	}catch(InterruptedException success){}
133	<	}
134	<	});
135	<	try {
136	<	t.start();
137	<	t.interrupt();
103	>
104	>	/**
105	>	* locking an unlocked fair lock succeeds
106	>	*/
107	>	public void testFairLock() {
108	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
109	>	rl.writeLock().lock();
110	>	assertTrue(rl.isWriteLocked());
111	>	assertTrue(rl.isWriteLockedByCurrentThread());
112	>	assertTrue(rl.writeLock().isHeldByCurrentThread());
113	>	assertEquals(0, rl.getReadLockCount());
114	>	rl.writeLock().unlock();
115	>	assertFalse(rl.isWriteLocked());
116	>	assertFalse(rl.isWriteLockedByCurrentThread());
117	>	assertFalse(rl.writeLock().isHeldByCurrentThread());
118	>	assertEquals(0, rl.getReadLockCount());
119	>	rl.readLock().lock();
120	>	assertFalse(rl.isWriteLocked());
121	>	assertFalse(rl.isWriteLockedByCurrentThread());
122	>	assertEquals(1, rl.getReadLockCount());
123	>	rl.readLock().unlock();
124	>	assertFalse(rl.isWriteLocked());
125	>	assertFalse(rl.isWriteLockedByCurrentThread());
126	>	assertEquals(0, rl.getReadLockCount());
127	>	}
128	>
129	>	/**
130	>	* getWriteHoldCount returns number of recursive holds
131	>	*/
132	>	public void testGetWriteHoldCount() {
133	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
134	>	for (int i = 1; i <= SIZE; i++) {
135	>	lock.writeLock().lock();
136	>	assertEquals(i,lock.getWriteHoldCount());
137	>	}
138	>	for (int i = SIZE; i > 0; i--) {
139		lock.writeLock().unlock();
140	<	t.join();
82	<	} catch(Exception e){
83	<	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	<	fail("should throw");
152	<	}catch(InterruptedException success){}
153	<	}
97	<	});
98	<	try {
99	<	t.start();
100	<	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();
103	<	} catch(Exception e){
104	<	fail("unexpected exception");
105	<	}
106	<	}
107	<
108	<	public void testInterruptedException4(){
109	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
110	<	lock.writeLock().lock();
111	<	Thread t = new Thread(new Runnable() {
112	<	public void run(){
113	<	try{
114	<	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
115	<	fail("should throw");
116	<	}catch(InterruptedException success){}
117	<	}
118	<	});
119	<	try {
120	<	t.start();
121	<	t.interrupt();
122	<	t.join();
123	<	} catch(Exception e){
124	<	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	<	assertFalse(lock.writeLock().tryLock());
166	<	}
136	<	});
137	<	try {
138	<	t.start();
139	<	t.join();
140	<	lock.writeLock().unlock();
141	<	} catch(Exception e){
142	<	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	<	assertFalse(lock.readLock().tryLock());
152	<	}
153	<	});
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");
186	<	}
187	<	}
181	>	rl.writeLock().unlock();
182	>	shouldThrow();
183	>	} catch (IllegalMonitorStateException success) {}
184	>	}
185	>
186	>
187	>	/**
188	>	* write-lockInterruptibly is interruptible
189	>	*/
190	>	public void testWriteLockInterruptibly_Interrupted() throws Exception {
191	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
192	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
193	>	public void realRun() throws InterruptedException {
194	>	lock.writeLock().lockInterruptibly();
195	>	lock.writeLock().unlock();
196	>	lock.writeLock().lockInterruptibly();
197	>	lock.writeLock().unlock();
198	>	}});
199	>
200	>	lock.writeLock().lock();
201	>	t.start();
202	>	Thread.sleep(SHORT_DELAY_MS);
203	>	t.interrupt();
204	>	Thread.sleep(SHORT_DELAY_MS);
205	>	lock.writeLock().unlock();
206	>	t.join();
207	>	}
208	>
209	>	/**
210	>	* 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	<	public void testMultipleReadLocks() {
262	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
263	<	lock.readLock().lock();
264	<	Thread t = new Thread(new Runnable() {
265	<	public void run(){
266	<	assertTrue(lock.readLock().tryLock());
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	<	});
308	<	try {
309	<	t.start();
310	<	t.join();
311	<	lock.readLock().unlock();
312	<	} catch(Exception e){
177	<	fail("unexpected exception");
178	<	}
179	<	}
306	>	}
307	>	});
308	>
309	>	t.start();
310	>	t.join();
311	>	lock.readLock().unlock();
312	>	}
313
314	<	public void testWriteAfterMultipleReadLocks() {
315	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
316	<	lock.readLock().lock();
317	<	Thread t1 = new Thread(new Runnable() {
318	<	public void run(){
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();
215	<	Thread t1 = new Thread(new Runnable() {
216	<	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(){
383	<	assertTrue(lock.readLock().tryLock());
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	<	try {
397	<	t.start();
398	<	t.join();
399	<	lock.readLock().unlock();
400	<	} catch(Exception e){
401	<	fail("unexpected exception");
259	<	}
260	<	}
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	<
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	<	public void testWriteTryLockWhenReadLocked() {
418	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
419	<	lock.readLock().lock();
420	<	Thread t = new Thread(new Runnable() {
421	<	public void run(){
422	<	assertFalse(lock.writeLock().tryLock());
423	<	}
424	<	});
425	<	try {
426	<	t.start();
427	<	t.join();
428	<	lock.readLock().unlock();
429	<	} catch(Exception e){
430	<	fail("unexpected exception");
431	<	}
432	<	}
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	<
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
283	–	public void testTryLock_Timeout(){
284	–	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
285	–	lock.writeLock().lock();
286	–	Thread t = new Thread(new Runnable() {
287	–	public void run(){
288	–	try {
289	–	assertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
290	–	} catch (Exception ex) {
291	–	fail("unexpected exception");
292	–	}
293	–	}
294	–	});
295	–	try {
296	–	t.start();
297	–	t.join();
298	–	lock.writeLock().unlock();
299	–	} catch(Exception e){
300	–	fail("unexpected exception");
301	–	}
302	–	}
451
452	<	public void testTryLock_Timeout2(){
453	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
454	<	lock.writeLock().lock();
455	<	Thread t = new Thread(new Runnable() {
456	<	public void run(){
457	<	try {
458	<	assertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
459	<	} catch (Exception ex) {
460	<	fail("unexpected exception");
461	<	}
462	<	}
463	<	});
464	<	try {
465	<	t.start();
466	<	t.join();
467	<	lock.writeLock().unlock();
468	<	} catch(Exception e){
469	<	fail("unexpected exception");
470	<	}
323	<	}
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	<	public void testLockInterruptibly() {
487	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
488	<	try {
489	<	lock.writeLock().lockInterruptibly();
490	<	} catch(Exception e) {
491	<	fail("unexpected exception");
492	<	}
493	<	Thread t = new Thread(new Runnable() {
494	<	public void run() {
495	<	try {
336	<	lock.writeLock().lockInterruptibly();
337	<	fail("should throw");
338	<	}
339	<	catch(InterruptedException success) {
340	<	}
341	<	}
342	<	});
343	<	try {
344	<	t.start();
345	<	t.interrupt();
346	<	t.join();
347	<	lock.writeLock().unlock();
348	<	} catch(Exception e){
349	<	fail("unexpected exception");
350	<	}
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	<	public void testLockInterruptibly2() {
499	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
500	<	try {
501	<	lock.writeLock().lockInterruptibly();
502	<	} catch(Exception e) {
503	<	fail("unexpected exception");
504	<	}
505	<	Thread t = new Thread(new Runnable() {
506	<	public void run() {
507	<	try {
508	<	lock.readLock().lockInterruptibly();
509	<	fail("should throw");
510	<	}
511	<	catch(InterruptedException success) {
512	<	}
513	<	}
514	<	});
515	<	try {
516	<	t.start();
517	<	t.interrupt();
518	<	t.join();
519	<	lock.writeLock().unlock();
520	<	} catch(Exception e){
521	<	fail("unexpected exception");
522	<	}
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	>
619	>	t.start();
620	>	t.join();
621	>	lock.readLock().unlock();
622	>	}
623	>
624	>
625	>
626	>	/**
627	>	* write tryLock fails when readlocked
628	>	*/
629	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
630	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
631	>	lock.readLock().lock();
632	>	Thread t = new Thread(new Runnable() {
633	>	public void run() {
634	>	threadAssertFalse(lock.writeLock().tryLock());
635	>	}
636	>	});
637	>
638	>	t.start();
639	>	t.join();
640	>	lock.readLock().unlock();
641	>	}
642	>
643	>
644	>	/**
645	>	* Fair Read tryLock succeeds if readlocked but not writelocked
646	>	*/
647	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
648	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
649	>	lock.readLock().lock();
650	>	Thread t = new Thread(new Runnable() {
651	>	public void run() {
652	>	threadAssertTrue(lock.readLock().tryLock());
653	>	lock.readLock().unlock();
654	>	}
655	>	});
656	>
657	>	t.start();
658	>	t.join();
659	>	lock.readLock().unlock();
660	>	}
661	>
662	>
663	>
664	>	/**
665	>	* Fair write tryLock fails when readlocked
666	>	*/
667	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
668	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
669	>	lock.readLock().lock();
670	>	Thread t = new Thread(new Runnable() {
671	>	public void run() {
672	>	threadAssertFalse(lock.writeLock().tryLock());
673	>	}
674	>	});
675	>
676	>	t.start();
677	>	t.join();
678	>	lock.readLock().unlock();
679		}
680
681	<	public void testAwait_IllegalMonitor() {
682	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
681	>
682	>
683	>	/**
684	>	* write timed tryLock times out if locked
685	>	*/
686	>	public void testWriteTryLock_Timeout() throws InterruptedException {
687	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
688	>	lock.writeLock().lock();
689	>	Thread t = new Thread(new CheckedRunnable() {
690	>	public void realRun() throws InterruptedException {
691	>	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
692	>	}});
693	>
694	>	t.start();
695	>	t.join();
696	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
697	>	lock.writeLock().unlock();
698	>	}
699	>
700	>	/**
701	>	* read timed tryLock times out if write-locked
702	>	*/
703	>	public void testReadTryLock_Timeout() throws InterruptedException {
704	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
705	>	lock.writeLock().lock();
706	>	Thread t = new Thread(new CheckedRunnable() {
707	>	public void realRun() throws InterruptedException {
708	>	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
709	>	}});
710	>
711	>	t.start();
712	>	t.join();
713	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
714	>	lock.writeLock().unlock();
715	>	}
716	>
717	>
718	>	/**
719	>	* write lockInterruptibly succeeds if lock free else is interruptible
720	>	*/
721	>	public void testWriteLockInterruptibly() throws InterruptedException {
722	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
723	>	lock.writeLock().lockInterruptibly();
724	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
725	>	public void realRun() throws InterruptedException {
726	>	lock.writeLock().lockInterruptibly();
727	>	}});
728	>
729	>	t.start();
730	>	Thread.sleep(SHORT_DELAY_MS);
731	>	t.interrupt();
732	>	Thread.sleep(SHORT_DELAY_MS);
733	>	t.join();
734	>	lock.writeLock().unlock();
735	>	}
736	>
737	>	/**
738	>	*  read lockInterruptibly succeeds if lock free else is interruptible
739	>	*/
740	>	public void testReadLockInterruptibly() throws InterruptedException {
741	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
742	>	lock.writeLock().lockInterruptibly();
743	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
744	>	public void realRun() throws InterruptedException {
745	>	lock.readLock().lockInterruptibly();
746	>	}});
747	>
748	>	t.start();
749	>	Thread.sleep(SHORT_DELAY_MS);
750	>	t.interrupt();
751	>	t.join();
752	>	lock.writeLock().unlock();
753	>	}
754	>
755	>	/**
756	>	* Calling await without holding lock throws IllegalMonitorStateException
757	>	*/
758	>	public void testAwait_IllegalMonitor() throws InterruptedException {
759	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
760		final Condition c = lock.writeLock().newCondition();
761		try {
762		c.await();
763	<	fail("should throw");
764	<	}
387	<	catch (IllegalMonitorStateException success) {
388	<	}
389	<	catch (Exception ex) {
390	<	fail("should throw IMSE");
391	<	}
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	<	}
401	<	catch (IllegalMonitorStateException success) {
402	<	}
403	<	catch (Exception ex) {
404	<	fail("should throw IMSE");
405	<	}
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();
416	<	}
417	<	catch (Exception ex) {
418	<	fail("unexpected exception");
419	<	}
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));
428	<	lock.writeLock().unlock();
429	<	}
430	<	catch (Exception ex) {
431	<	fail("unexpected exception");
432	<	}
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)));
442	<	lock.writeLock().unlock();
443	<	}
444	<	catch (Exception ex) {
445	<	fail("unexpected exception");
446	<	}
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	<	fail("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();
874	<	c.awaitUninterruptibly();
875	<	lock.writeLock().unlock();
876	<	}
877	<	});
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);
493	<	t.interrupt();
494	<	lock.writeLock().lock();
881	>	thread.interrupt();
882	>	thread.canAwake = true;
883		c.signal();
884	+	} finally {
885		lock.writeLock().unlock();
497	–	t.join(SHORT_DELAY_MS);
498	–	assertFalse(t.isAlive());
499	–	}
500	–	catch (Exception ex) {
501	–	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	<	fail("should throw");
903	<	}
904	<	catch(InterruptedException success) {
905	<	}
906	<	}
907	<	});
908	<
909	<	try {
910	<	t.start();
911	<	Thread.sleep(SHORT_DELAY_MS);
912	<	t.interrupt();
913	<	t.join(SHORT_DELAY_MS);
914	<	assertFalse(t.isAlive());
915	<	}
916	<	catch (Exception ex) {
917	<	fail("unexpected exception");
918	<	}
919	<	}
920	<
921	<	public void testAwaitNanos_Interrupt() {
922	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
923	<	final Condition c = lock.writeLock().newCondition();
924	<	Thread t = new Thread(new Runnable() {
925	<	public void run() {
926	<	try {
927	<	lock.writeLock().lock();
928	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
929	<	lock.writeLock().unlock();
930	<	fail("should throw");
931	<	}
932	<	catch(InterruptedException success) {
933	<	}
934	<	}
935	<	});
936	<
937	<	try {
938	<	t.start();
939	<	Thread.sleep(SHORT_DELAY_MS);
940	<	t.interrupt();
941	<	t.join(SHORT_DELAY_MS);
942	<	assertFalse(t.isAlive());
943	<	}
944	<	catch (Exception ex) {
945	<	fail("unexpected exception");
946	<	}
947	<	}
948	<
949	<	public void testAwaitUntil_Interrupt() {
950	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
951	<	final Condition c = lock.writeLock().newCondition();
952	<	Thread t = new Thread(new Runnable() {
953	<	public void run() {
954	<	try {
955	<	lock.writeLock().lock();
956	<	java.util.Date d = new java.util.Date();
957	<	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
958	<	lock.writeLock().unlock();
959	<	fail("should throw");
960	<	}
961	<	catch(InterruptedException success) {
962	<	}
963	<	}
964	<	});
965	<
966	<	try {
967	<	t.start();
968	<	Thread.sleep(SHORT_DELAY_MS);
969	<	t.interrupt();
970	<	t.join(SHORT_DELAY_MS);
971	<	assertFalse(t.isAlive());
972	<	}
973	<	catch (Exception ex) {
974	<	fail("unexpected exception");
975	<	}
976	<	}
977	<
978	<	public void testSignalAll() {
979	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
980	<	final Condition c = lock.writeLock().newCondition();
981	<	Thread t1 = new Thread(new Runnable() {
982	<	public void run() {
983	<	try {
596	<	lock.writeLock().lock();
597	<	c.await();
598	<	lock.writeLock().unlock();
599	<	}
600	<	catch(InterruptedException e) {
601	<	fail("unexpected exception");
602	<	}
603	<	}
604	<	});
605	<
606	<	Thread t2 = new Thread(new Runnable() {
607	<	public void run() {
608	<	try {
609	<	lock.writeLock().lock();
610	<	c.await();
611	<	lock.writeLock().unlock();
612	<	}
613	<	catch(InterruptedException e) {
614	<	fail("unexpected exception");
615	<	}
616	<	}
617	<	});
618	<
619	<	try {
620	<	t1.start();
621	<	t2.start();
622	<	Thread.sleep(SHORT_DELAY_MS);
623	<	lock.writeLock().lock();
624	<	c.signalAll();
625	<	lock.writeLock().unlock();
626	<	t1.join(SHORT_DELAY_MS);
627	<	t2.join(SHORT_DELAY_MS);
628	<	assertFalse(t1.isAlive());
629	<	assertFalse(t2.isAlive());
630	<	}
631	<	catch (Exception ex) {
632	<	fail("unexpected exception");
633	<	}
893	>	/**
894	>	* await is interruptible
895	>	*/
896	>	public void testAwait_Interrupt() throws InterruptedException {
897	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
898	>	final Condition c = lock.writeLock().newCondition();
899	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
900	>	public void realRun() throws InterruptedException {
901	>	lock.writeLock().lock();
902	>	c.await();
903	>	lock.writeLock().unlock();
904	>	}});
905	>
906	>	t.start();
907	>	Thread.sleep(SHORT_DELAY_MS);
908	>	t.interrupt();
909	>	t.join(SHORT_DELAY_MS);
910	>	assertFalse(t.isAlive());
911	>	}
912	>
913	>	/**
914	>	* awaitNanos is interruptible
915	>	*/
916	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
917	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
918	>	final Condition c = lock.writeLock().newCondition();
919	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
920	>	public void realRun() throws InterruptedException {
921	>	lock.writeLock().lock();
922	>	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
923	>	lock.writeLock().unlock();
924	>	}});
925	>
926	>	t.start();
927	>	Thread.sleep(SHORT_DELAY_MS);
928	>	t.interrupt();
929	>	t.join(SHORT_DELAY_MS);
930	>	assertFalse(t.isAlive());
931	>	}
932	>
933	>	/**
934	>	* awaitUntil is interruptible
935	>	*/
936	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
937	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
938	>	final Condition c = lock.writeLock().newCondition();
939	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
940	>	public void realRun() throws InterruptedException {
941	>	lock.writeLock().lock();
942	>	java.util.Date d = new java.util.Date();
943	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
944	>	lock.writeLock().unlock();
945	>	}});
946	>
947	>	t.start();
948	>	Thread.sleep(SHORT_DELAY_MS);
949	>	t.interrupt();
950	>	t.join(SHORT_DELAY_MS);
951	>	assertFalse(t.isAlive());
952	>	}
953	>
954	>	/**
955	>	* signalAll wakes up all threads
956	>	*/
957	>	public void testSignalAll() throws InterruptedException {
958	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
959	>	final Condition c = lock.writeLock().newCondition();
960	>	Thread t1 = new Thread(new CheckedRunnable() {
961	>	public void realRun() throws InterruptedException {
962	>	lock.writeLock().lock();
963	>	c.await();
964	>	lock.writeLock().unlock();
965	>	}});
966	>
967	>	Thread t2 = new Thread(new CheckedRunnable() {
968	>	public void realRun() throws InterruptedException {
969	>	lock.writeLock().lock();
970	>	c.await();
971	>	lock.writeLock().unlock();
972	>	}});
973	>
974	>	t1.start();
975	>	t2.start();
976	>	Thread.sleep(SHORT_DELAY_MS);
977	>	lock.writeLock().lock();
978	>	c.signalAll();
979	>	lock.writeLock().unlock();
980	>	t1.join(SHORT_DELAY_MS);
981	>	t2.join(SHORT_DELAY_MS);
982	>	assertFalse(t1.isAlive());
983	>	assertFalse(t2.isAlive());
984		}
985
986	<	public void testSerialization() {
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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