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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.5 by dl, Fri Sep 26 15:33:13 2003 UTC vs.
Revision 1.54 by jsr166, Mon May 2 01:07:15 2011 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/publicdomain/zero/1.0/
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	+	/**
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	+	* Releases write lock, checking that it had a hold count of 1.
63	+	*/
64	+	void releaseWriteLock(ReentrantReadWriteLock lock) {
65	+	ReentrantReadWriteLock.WriteLock writeLock = lock.writeLock();
66	+	assertTrue(writeLock.isHeldByCurrentThread());
67	+	writeLock.unlock();
68	+	assertFalse(writeLock.isHeldByCurrentThread());
69	+	}
70	+
71	+	/**
72	+	* Constructor sets given fairness, and is in unlocked state
73	+	*/
74	+	public void testConstructor() {
75	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
76	+	assertFalse(rl.isFair());
77	+	assertFalse(rl.isWriteLocked());
78	+	assertEquals(0, rl.getReadLockCount());
79	+	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
80	+	assertTrue(r2.isFair());
81	+	assertFalse(r2.isWriteLocked());
82	+	assertEquals(0, r2.getReadLockCount());
83	+	ReentrantReadWriteLock r3 = new ReentrantReadWriteLock(false);
84	+	assertFalse(r3.isFair());
85	+	assertFalse(r3.isWriteLocked());
86	+	assertEquals(0, r3.getReadLockCount());
87	+	}
88
89		/**
90		* write-locking and read-locking an unlocked lock succeed
91		*/
92	<	public void testLock() {
93	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
92	>	public void testLock() {
93	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
94		rl.writeLock().lock();
95	+	assertTrue(rl.isWriteLocked());
96	+	assertTrue(rl.isWriteLockedByCurrentThread());
97	+	assertTrue(rl.writeLock().isHeldByCurrentThread());
98	+	assertEquals(0, rl.getReadLockCount());
99		rl.writeLock().unlock();
100	+	assertFalse(rl.isWriteLocked());
101	+	assertFalse(rl.isWriteLockedByCurrentThread());
102	+	assertFalse(rl.writeLock().isHeldByCurrentThread());
103	+	assertEquals(0, rl.getReadLockCount());
104		rl.readLock().lock();
105	+	assertFalse(rl.isWriteLocked());
106	+	assertFalse(rl.isWriteLockedByCurrentThread());
107	+	assertEquals(1, rl.getReadLockCount());
108		rl.readLock().unlock();
109	+	assertFalse(rl.isWriteLocked());
110	+	assertFalse(rl.isWriteLockedByCurrentThread());
111	+	assertEquals(0, rl.getReadLockCount());
112		}
113
114
115		/**
116		* locking an unlocked fair lock succeeds
117		*/
118	<	public void testFairLock() {
119	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
118	>	public void testFairLock() {
119	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
120		rl.writeLock().lock();
121	+	assertTrue(rl.isWriteLocked());
122	+	assertTrue(rl.isWriteLockedByCurrentThread());
123	+	assertTrue(rl.writeLock().isHeldByCurrentThread());
124	+	assertEquals(0, rl.getReadLockCount());
125		rl.writeLock().unlock();
126	+	assertFalse(rl.isWriteLocked());
127	+	assertFalse(rl.isWriteLockedByCurrentThread());
128	+	assertFalse(rl.writeLock().isHeldByCurrentThread());
129	+	assertEquals(0, rl.getReadLockCount());
130		rl.readLock().lock();
131	+	assertFalse(rl.isWriteLocked());
132	+	assertFalse(rl.isWriteLockedByCurrentThread());
133	+	assertEquals(1, rl.getReadLockCount());
134		rl.readLock().unlock();
135	+	assertFalse(rl.isWriteLocked());
136	+	assertFalse(rl.isWriteLockedByCurrentThread());
137	+	assertEquals(0, rl.getReadLockCount());
138		}
139
140		/**
141	<	* write-unlocking an unlocked lock throws IllegalMonitorStateException
141	>	* getWriteHoldCount returns number of recursive holds
142		*/
143	<	public void testUnlock_IllegalMonitorStateException() {
144	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
145	<	try {
146	<	rl.writeLock().unlock();
147	<	shouldThrow();
148	<	} catch(IllegalMonitorStateException success){}
143	>	public void testGetWriteHoldCount() {
144	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
145	>	for (int i = 1; i <= SIZE; i++) {
146	>	lock.writeLock().lock();
147	>	assertEquals(i,lock.getWriteHoldCount());
148	>	}
149	>	for (int i = SIZE; i > 0; i--) {
150	>	lock.writeLock().unlock();
151	>	assertEquals(i-1,lock.getWriteHoldCount());
152	>	}
153		}
154
56	–
155		/**
156	<	* write-lockInterruptibly is interruptible
156	>	* WriteLock.getHoldCount returns number of recursive holds
157		*/
158	<	public void testWriteLockInterruptibly_Interrupted() {
159	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
160	<	lock.writeLock().lock();
161	<	Thread t = new Thread(new Runnable() {
162	<	public void run() {
163	<	try {
164	<	lock.writeLock().lockInterruptibly();
67	<	threadShouldThrow();
68	<	} catch(InterruptedException success){}
69	<	}
70	<	});
71	<	try {
72	<	t.start();
73	<	t.interrupt();
74	<	lock.writeLock().unlock();
75	<	t.join();
76	<	} catch(Exception e){
77	<	unexpectedException();
78	<	}
79	<	}
80	<
81	<	/**
82	<	* timed write-trylock is interruptible
83	<	*/
84	<	public void testWriteTryLock_Interrupted() {
85	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
86	<	lock.writeLock().lock();
87	<	Thread t = new Thread(new Runnable() {
88	<	public void run() {
89	<	try {
90	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
91	<	threadShouldThrow();
92	<	} catch(InterruptedException success){}
93	<	}
94	<	});
95	<	try {
96	<	t.start();
97	<	t.interrupt();
158	>	public void testGetHoldCount() {
159	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
160	>	for (int i = 1; i <= SIZE; i++) {
161	>	lock.writeLock().lock();
162	>	assertEquals(i,lock.writeLock().getHoldCount());
163	>	}
164	>	for (int i = SIZE; i > 0; i--) {
165		lock.writeLock().unlock();
166	<	t.join();
100	<	} catch(Exception e){
101	<	unexpectedException();
166	>	assertEquals(i-1,lock.writeLock().getHoldCount());
167		}
168		}
169
170		/**
171	<	* read-lockInterruptibly is interruptible
171	>	* getReadHoldCount returns number of recursive holds
172		*/
173	<	public void testReadLockInterruptibly_Interrupted() {
174	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
175	<	lock.writeLock().lock();
176	<	Thread t = new Thread(new Runnable() {
177	<	public void run() {
178	<	try {
179	<	lock.readLock().lockInterruptibly();
180	<	threadShouldThrow();
181	<	} catch(InterruptedException success){}
117	<	}
118	<	});
119	<	try {
120	<	t.start();
121	<	t.interrupt();
122	<	lock.writeLock().unlock();
123	<	t.join();
124	<	} catch(Exception e){
125	<	unexpectedException();
126	<	}
127	<	}
128	<
129	<	/**
130	<	* timed read-trylock is interruptible
131	<	*/
132	<	public void testReadTryLock_Interrupted() {
133	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
134	<	lock.writeLock().lock();
135	<	Thread t = new Thread(new Runnable() {
136	<	public void run() {
137	<	try {
138	<	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
139	<	threadShouldThrow();
140	<	} catch(InterruptedException success){}
141	<	}
142	<	});
143	<	try {
144	<	t.start();
145	<	t.interrupt();
146	<	t.join();
147	<	} catch(Exception e){
148	<	unexpectedException();
173	>	public void testGetReadHoldCount() {
174	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
175	>	for (int i = 1; i <= SIZE; i++) {
176	>	lock.readLock().lock();
177	>	assertEquals(i,lock.getReadHoldCount());
178	>	}
179	>	for (int i = SIZE; i > 0; i--) {
180	>	lock.readLock().unlock();
181	>	assertEquals(i-1,lock.getReadHoldCount());
182		}
183		}
184
152	–
153	–	/**
154	–	* write-trylock fails if locked
155	–	*/
156	–	public void testWriteTryLockWhenLocked() {
157	–	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
158	–	lock.writeLock().lock();
159	–	Thread t = new Thread(new Runnable() {
160	–	public void run() {
161	–	threadAssertFalse(lock.writeLock().tryLock());
162	–	}
163	–	});
164	–	try {
165	–	t.start();
166	–	t.join();
167	–	lock.writeLock().unlock();
168	–	} catch(Exception e){
169	–	unexpectedException();
170	–	}
171	–	}
185
186		/**
187	<	* read-trylock fails if locked
187	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
188		*/
189	<	public void testReadTryLockWhenLocked() {
190	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
178	<	lock.writeLock().lock();
179	<	Thread t = new Thread(new Runnable() {
180	<	public void run() {
181	<	threadAssertFalse(lock.readLock().tryLock());
182	<	}
183	<	});
189	>	public void testUnlock_IllegalMonitorStateException() {
190	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
191		try {
192	<	t.start();
193	<	t.join();
194	<	lock.writeLock().unlock();
195	<	} catch(Exception e){
196	<	unexpectedException();
197	<	}
198	<	}
192	>	rl.writeLock().unlock();
193	>	shouldThrow();
194	>	} catch (IllegalMonitorStateException success) {}
195	>	}
196	>
197	>
198	>	/**
199	>	* write-lockInterruptibly is interruptible
200	>	*/
201	>	public void testWriteLockInterruptibly_Interrupted() throws Exception {
202	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
203	>	lock.writeLock().lock();
204	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
205	>	public void realRun() throws InterruptedException {
206	>	lock.writeLock().lockInterruptibly();
207	>	}});
208	>
209	>	Thread.sleep(SHORT_DELAY_MS);
210	>	t.interrupt();
211	>	awaitTermination(t, LONG_DELAY_MS);
212	>	releaseWriteLock(lock);
213	>	}
214	>
215	>	/**
216	>	* timed write-tryLock is interruptible
217	>	*/
218	>	public void testWriteTryLock_Interrupted() throws InterruptedException {
219	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
220	>	lock.writeLock().lock();
221	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
222	>	public void realRun() throws InterruptedException {
223	>	lock.writeLock().tryLock(SMALL_DELAY_MS, MILLISECONDS);
224	>	}});
225	>
226	>	Thread.sleep(SHORT_DELAY_MS);
227	>	t.interrupt();
228	>	awaitTermination(t, LONG_DELAY_MS);
229	>	releaseWriteLock(lock);
230	>	}
231	>
232	>	/**
233	>	* read-lockInterruptibly is interruptible
234	>	*/
235	>	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
236	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
237	>	lock.writeLock().lock();
238	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
239	>	public void realRun() throws InterruptedException {
240	>	lock.readLock().lockInterruptibly();
241	>	}});
242	>
243	>	Thread.sleep(SHORT_DELAY_MS);
244	>	t.interrupt();
245	>	awaitTermination(t, LONG_DELAY_MS);
246	>	releaseWriteLock(lock);
247	>	}
248	>
249	>	/**
250	>	* timed read-tryLock is interruptible
251	>	*/
252	>	public void testReadTryLock_Interrupted() throws InterruptedException {
253	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
254	>	lock.writeLock().lock();
255	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
256	>	public void realRun() throws InterruptedException {
257	>	lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS);
258	>	}});
259	>
260	>	Thread.sleep(SHORT_DELAY_MS);
261	>	t.interrupt();
262	>	awaitTermination(t, LONG_DELAY_MS);
263	>	releaseWriteLock(lock);
264	>	}
265	>
266	>
267	>	/**
268	>	* write-tryLock fails if locked
269	>	*/
270	>	public void testWriteTryLockWhenLocked() throws InterruptedException {
271	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
272	>	lock.writeLock().lock();
273	>	Thread t = newStartedThread(new CheckedRunnable() {
274	>	public void realRun() {
275	>	assertFalse(lock.writeLock().tryLock());
276	>	}});
277	>
278	>	awaitTermination(t, LONG_DELAY_MS);
279	>	releaseWriteLock(lock);
280	>	}
281	>
282	>	/**
283	>	* read-tryLock fails if locked
284	>	*/
285	>	public void testReadTryLockWhenLocked() throws InterruptedException {
286	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
287	>	lock.writeLock().lock();
288	>	Thread t = newStartedThread(new CheckedRunnable() {
289	>	public void realRun() {
290	>	assertFalse(lock.readLock().tryLock());
291	>	}});
292	>
293	>	awaitTermination(t, LONG_DELAY_MS);
294	>	releaseWriteLock(lock);
295	>	}
296
297		/**
298		* Multiple threads can hold a read lock when not write-locked
299		*/
300	<	public void testMultipleReadLocks() {
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	<	});
309	<	try {
310	<	t.start();
311	<	t.join();
208	<	lock.readLock().unlock();
209	<	} catch(Exception e){
210	<	unexpectedException();
211	<	}
212	<	}
300	>	public void testMultipleReadLocks() throws InterruptedException {
301	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
302	>	lock.readLock().lock();
303	>	Thread t = newStartedThread(new CheckedRunnable() {
304	>	public void realRun() {
305	>	assertTrue(lock.readLock().tryLock());
306	>	lock.readLock().unlock();
307	>	}});
308	>
309	>	awaitTermination(t, LONG_DELAY_MS);
310	>	lock.readLock().unlock();
311	>	}
312
313		/**
314		* A writelock succeeds after reading threads unlock
315		*/
316	<	public void testWriteAfterMultipleReadLocks() {
317	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
318	<	lock.readLock().lock();
319	<	Thread t1 = new Thread(new Runnable() {
320	<	public void run() {
321	<	lock.readLock().lock();
322	<	lock.readLock().unlock();
323	<	}
324	<	});
325	<	Thread t2 = new Thread(new Runnable() {
326	<	public void run() {
327	<	lock.writeLock().lock();
328	<	lock.writeLock().unlock();
329	<	}
330	<	});
331	<
332	<	try {
333	<	t1.start();
334	<	t2.start();
236	<	Thread.sleep(SHORT_DELAY_MS);
237	<	lock.readLock().unlock();
238	<	t1.join(MEDIUM_DELAY_MS);
239	<	t2.join(MEDIUM_DELAY_MS);
240	<	assertTrue(!t1.isAlive());
241	<	assertTrue(!t2.isAlive());
242	<
243	<	} catch(Exception e){
244	<	unexpectedException();
245	<	}
246	<	}
316	>	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
317	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
318	>	lock.readLock().lock();
319	>	Thread t1 = newStartedThread(new CheckedRunnable() {
320	>	public void realRun() {
321	>	lock.readLock().lock();
322	>	lock.readLock().unlock();
323	>	}});
324	>	Thread t2 = newStartedThread(new CheckedRunnable() {
325	>	public void realRun() {
326	>	lock.writeLock().lock();
327	>	lock.writeLock().unlock();
328	>	}});
329	>
330	>	Thread.sleep(SHORT_DELAY_MS);
331	>	lock.readLock().unlock();
332	>	awaitTermination(t1, LONG_DELAY_MS);
333	>	awaitTermination(t2, LONG_DELAY_MS);
334	>	}
335
336		/**
337		* Readlocks succeed after a writing thread unlocks
338		*/
339	<	public void testReadAfterWriteLock() {
340	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
341	<	lock.writeLock().lock();
342	<	Thread t1 = new Thread(new Runnable() {
343	<	public void run() {
344	<	lock.readLock().lock();
345	<	lock.readLock().unlock();
346	<	}
347	<	});
348	<	Thread t2 = new Thread(new Runnable() {
349	<	public void run() {
350	<	lock.readLock().lock();
351	<	lock.readLock().unlock();
264	<	}
265	<	});
266	<
267	<	try {
268	<	t1.start();
269	<	t2.start();
270	<	Thread.sleep(SHORT_DELAY_MS);
271	<	lock.writeLock().unlock();
272	<	t1.join(MEDIUM_DELAY_MS);
273	<	t2.join(MEDIUM_DELAY_MS);
274	<	assertTrue(!t1.isAlive());
275	<	assertTrue(!t2.isAlive());
276	<
277	<	} catch(Exception e){
278	<	unexpectedException();
279	<	}
280	<	}
339	>	public void testReadAfterWriteLock() throws InterruptedException {
340	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
341	>	lock.writeLock().lock();
342	>	Thread t1 = newStartedThread(new CheckedRunnable() {
343	>	public void realRun() {
344	>	lock.readLock().lock();
345	>	lock.readLock().unlock();
346	>	}});
347	>	Thread t2 = newStartedThread(new CheckedRunnable() {
348	>	public void realRun() {
349	>	lock.readLock().lock();
350	>	lock.readLock().unlock();
351	>	}});
352
353	+	Thread.sleep(SHORT_DELAY_MS);
354	+	releaseWriteLock(lock);
355	+	awaitTermination(t1, LONG_DELAY_MS);
356	+	awaitTermination(t2, LONG_DELAY_MS);
357	+	}
358
359		/**
360	<	* Read trylock succeeds if readlocked but not writelocked
361	<	*/
362	<	public void testTryLockWhenReadLocked() {
363	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
364	<	lock.readLock().lock();
365	<	Thread t = new Thread(new Runnable() {
366	<	public void run() {
367	<	threadAssertTrue(lock.readLock().tryLock());
368	<	lock.readLock().unlock();
369	<	}
370	<	});
371	<	try {
372	<	t.start();
373	<	t.join();
374	<	lock.readLock().unlock();
375	<	} catch(Exception e){
376	<	unexpectedException();
377	<	}
378	<	}
360	>	* Read trylock succeeds if write locked by current thread
361	>	*/
362	>	public void testReadHoldingWriteLock() {
363	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
364	>	lock.writeLock().lock();
365	>	assertTrue(lock.readLock().tryLock());
366	>	lock.readLock().unlock();
367	>	lock.writeLock().unlock();
368	>	}
369	>
370	>	/**
371	>	* Read lock succeeds if write locked by current thread even if
372	>	* other threads are waiting for readlock
373	>	*/
374	>	public void testReadHoldingWriteLock2() throws InterruptedException {
375	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
376	>	lock.writeLock().lock();
377	>	Thread t1 = newStartedThread(new CheckedRunnable() {
378	>	public void realRun() {
379	>	lock.readLock().lock();
380	>	lock.readLock().unlock();
381	>	}});
382	>	Thread t2 = newStartedThread(new CheckedRunnable() {
383	>	public void realRun() {
384	>	lock.readLock().lock();
385	>	lock.readLock().unlock();
386	>	}});
387
388	<
388	>	lock.readLock().lock();
389	>	lock.readLock().unlock();
390	>	Thread.sleep(SHORT_DELAY_MS);
391	>	lock.readLock().lock();
392	>	lock.readLock().unlock();
393	>	lock.writeLock().unlock();
394	>	awaitTermination(t1, LONG_DELAY_MS);
395	>	awaitTermination(t2, LONG_DELAY_MS);
396	>	}
397
398		/**
399	<	* write trylock fails when readlocked
399	>	* Read lock succeeds if write locked by current thread even if
400	>	* other threads are waiting for writelock
401		*/
402	<	public void testWriteTryLockWhenReadLocked() {
403	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
404	<	lock.readLock().lock();
405	<	Thread t = new Thread(new Runnable() {
406	<	public void run() {
407	<	threadAssertFalse(lock.writeLock().tryLock());
408	<	}
409	<	});
410	<	try {
411	<	t.start();
412	<	t.join();
413	<	lock.readLock().unlock();
414	<	} catch(Exception e){
415	<	unexpectedException();
416	<	}
417	<	}
402	>	public void testReadHoldingWriteLock3() throws InterruptedException {
403	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
404	>	lock.writeLock().lock();
405	>	Thread t1 = newStartedThread(new CheckedRunnable() {
406	>	public void realRun() {
407	>	lock.writeLock().lock();
408	>	lock.writeLock().unlock();
409	>	}});
410	>	Thread t2 = newStartedThread(new CheckedRunnable() {
411	>	public void realRun() {
412	>	lock.writeLock().lock();
413	>	lock.writeLock().unlock();
414	>	}});
415	>
416	>	lock.readLock().lock();
417	>	lock.readLock().unlock();
418	>	Thread.sleep(SHORT_DELAY_MS);
419	>	lock.readLock().lock();
420	>	lock.readLock().unlock();
421	>	lock.writeLock().unlock();
422	>	awaitTermination(t1, LONG_DELAY_MS);
423	>	awaitTermination(t2, LONG_DELAY_MS);
424	>	}
425
326	–
426
427		/**
428	<	* write timed trylock times out if locked
429	<	*/
430	<	public void testWriteTryLock_Timeout() {
431	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
432	<	lock.writeLock().lock();
433	<	Thread t = new Thread(new Runnable() {
434	<	public void run() {
435	<	try {
436	<	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
437	<	} catch (Exception ex) {
438	<	threadUnexpectedException();
439	<	}
440	<	}
441	<	});
442	<	try {
443	<	t.start();
444	<	t.join();
445	<	lock.writeLock().unlock();
446	<	} catch(Exception e){
447	<	unexpectedException();
448	<	}
449	<	}
428	>	* Write lock succeeds if write locked by current thread even if
429	>	* other threads are waiting for writelock
430	>	*/
431	>	public void testWriteHoldingWriteLock4() throws InterruptedException {
432	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
433	>	lock.writeLock().lock();
434	>	Thread t1 = newStartedThread(new CheckedRunnable() {
435	>	public void realRun() {
436	>	lock.writeLock().lock();
437	>	lock.writeLock().unlock();
438	>	}});
439	>	Thread t2 = newStartedThread(new CheckedRunnable() {
440	>	public void realRun() {
441	>	lock.writeLock().lock();
442	>	lock.writeLock().unlock();
443	>	}});
444	>
445	>	lock.writeLock().lock();
446	>	lock.writeLock().unlock();
447	>	Thread.sleep(SHORT_DELAY_MS);
448	>	lock.writeLock().lock();
449	>	lock.writeLock().unlock();
450	>	lock.writeLock().unlock();
451	>	awaitTermination(t1, LONG_DELAY_MS);
452	>	awaitTermination(t2, LONG_DELAY_MS);
453	>	}
454	>
455
456		/**
457	<	* read timed trylock times out if write-locked
457	>	* Fair Read trylock succeeds if write locked by current thread
458		*/
459	<	public void testReadTryLock_Timeout() {
460	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
461	<	lock.writeLock().lock();
462	<	Thread t = new Thread(new Runnable() {
463	<	public void run() {
464	<	try {
465	<	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
466	<	} catch (Exception ex) {
467	<	threadUnexpectedException();
468	<	}
469	<	}
470	<	});
471	<	try {
472	<	t.start();
473	<	t.join();
474	<	lock.writeLock().unlock();
475	<	} catch(Exception e){
476	<	unexpectedException();
477	<	}
478	<	}
459	>	public void testReadHoldingWriteLockFair() {
460	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
461	>	lock.writeLock().lock();
462	>	assertTrue(lock.readLock().tryLock());
463	>	lock.readLock().unlock();
464	>	lock.writeLock().unlock();
465	>	}
466	>
467	>	/**
468	>	* Fair Read lock succeeds if write locked by current thread even if
469	>	* other threads are waiting for readlock
470	>	*/
471	>	public void testReadHoldingWriteLockFair2() throws InterruptedException {
472	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
473	>	lock.writeLock().lock();
474	>	Thread t1 = newStartedThread(new CheckedRunnable() {
475	>	public void realRun() {
476	>	lock.readLock().lock();
477	>	lock.readLock().unlock();
478	>	}});
479	>	Thread t2 = newStartedThread(new CheckedRunnable() {
480	>	public void realRun() {
481	>	lock.readLock().lock();
482	>	lock.readLock().unlock();
483	>	}});
484	>
485	>	lock.readLock().lock();
486	>	lock.readLock().unlock();
487	>	Thread.sleep(SHORT_DELAY_MS);
488	>	lock.readLock().lock();
489	>	lock.readLock().unlock();
490	>	lock.writeLock().unlock();
491	>	awaitTermination(t1, LONG_DELAY_MS);
492	>	awaitTermination(t2, LONG_DELAY_MS);
493	>	}
494
495
496		/**
497	<	* write lockInterruptibly succeeds if lock free else is interruptible
497	>	* Fair Read lock succeeds if write locked by current thread even if
498	>	* other threads are waiting for writelock
499		*/
500	<	public void testWriteLockInterruptibly() {
501	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
502	<	try {
503	<	lock.writeLock().lockInterruptibly();
504	<	} catch(Exception e) {
505	<	unexpectedException();
506	<	}
507	<	Thread t = new Thread(new Runnable() {
508	<	public void run() {
509	<	try {
510	<	lock.writeLock().lockInterruptibly();
511	<	threadShouldThrow();
512	<	}
513	<	catch(InterruptedException success) {
514	<	}
515	<	}
516	<	});
517	<	try {
518	<	t.start();
519	<	t.interrupt();
520	<	t.join();
521	<	lock.writeLock().unlock();
402	<	} catch(Exception e){
403	<	unexpectedException();
404	<	}
500	>	public void testReadHoldingWriteLockFair3() throws InterruptedException {
501	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
502	>	lock.writeLock().lock();
503	>	Thread t1 = newStartedThread(new CheckedRunnable() {
504	>	public void realRun() {
505	>	lock.writeLock().lock();
506	>	lock.writeLock().unlock();
507	>	}});
508	>	Thread t2 = newStartedThread(new CheckedRunnable() {
509	>	public void realRun() {
510	>	lock.writeLock().lock();
511	>	lock.writeLock().unlock();
512	>	}});
513	>
514	>	lock.readLock().lock();
515	>	lock.readLock().unlock();
516	>	Thread.sleep(SHORT_DELAY_MS);
517	>	lock.readLock().lock();
518	>	lock.readLock().unlock();
519	>	lock.writeLock().unlock();
520	>	awaitTermination(t1, LONG_DELAY_MS);
521	>	awaitTermination(t2, LONG_DELAY_MS);
522		}
523
524	+
525		/**
526	<	*  read lockInterruptibly succeeds if lock free else is interruptible
526	>	* Fair Write lock succeeds if write locked by current thread even if
527	>	* other threads are waiting for writelock
528		*/
529	<	public void testReadLockInterruptibly() {
530	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
531	<	try {
532	<	lock.writeLock().lockInterruptibly();
533	<	} catch(Exception e) {
534	<	unexpectedException();
535	<	}
536	<	Thread t = new Thread(new Runnable() {
537	<	public void run() {
538	<	try {
539	<	lock.readLock().lockInterruptibly();
540	<	threadShouldThrow();
541	<	}
542	<	catch(InterruptedException success) {
543	<	}
544	<	}
545	<	});
546	<	try {
547	<	t.start();
548	<	t.interrupt();
549	<	t.join();
550	<	lock.writeLock().unlock();
551	<	} catch(Exception e){
552	<	unexpectedException();
553	<	}
529	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
530	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
531	>	lock.writeLock().lock();
532	>	Thread t1 = newStartedThread(new CheckedRunnable() {
533	>	public void realRun() {
534	>	lock.writeLock().lock();
535	>	lock.writeLock().unlock();
536	>	}});
537	>	Thread t2 = newStartedThread(new CheckedRunnable() {
538	>	public void realRun() {
539	>	lock.writeLock().lock();
540	>	lock.writeLock().unlock();
541	>	}});
542	>
543	>	Thread.sleep(SHORT_DELAY_MS);
544	>	assertTrue(lock.isWriteLockedByCurrentThread());
545	>	assertEquals(1, lock.getWriteHoldCount());
546	>	lock.writeLock().lock();
547	>	assertEquals(2, lock.getWriteHoldCount());
548	>	lock.writeLock().unlock();
549	>	lock.writeLock().lock();
550	>	lock.writeLock().unlock();
551	>	lock.writeLock().unlock();
552	>	awaitTermination(t1, LONG_DELAY_MS);
553	>	awaitTermination(t2, LONG_DELAY_MS);
554	>	}
555	>
556	>
557	>	/**
558	>	* Read tryLock succeeds if readlocked but not writelocked
559	>	*/
560	>	public void testTryLockWhenReadLocked() throws InterruptedException {
561	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
562	>	lock.readLock().lock();
563	>	Thread t = newStartedThread(new CheckedRunnable() {
564	>	public void realRun() {
565	>	assertTrue(lock.readLock().tryLock());
566	>	lock.readLock().unlock();
567	>	}});
568	>
569	>	awaitTermination(t, LONG_DELAY_MS);
570	>	lock.readLock().unlock();
571	>	}
572	>
573	>	/**
574	>	* write tryLock fails when readlocked
575	>	*/
576	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
577	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
578	>	lock.readLock().lock();
579	>	Thread t = newStartedThread(new CheckedRunnable() {
580	>	public void realRun() {
581	>	assertFalse(lock.writeLock().tryLock());
582	>	}});
583	>
584	>	awaitTermination(t, LONG_DELAY_MS);
585	>	lock.readLock().unlock();
586	>	}
587	>
588	>
589	>	/**
590	>	* Fair Read tryLock succeeds if readlocked but not writelocked
591	>	*/
592	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
593	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
594	>	lock.readLock().lock();
595	>	Thread t = newStartedThread(new CheckedRunnable() {
596	>	public void realRun() {
597	>	assertTrue(lock.readLock().tryLock());
598	>	lock.readLock().unlock();
599	>	}});
600	>
601	>	awaitTermination(t, LONG_DELAY_MS);
602	>	lock.readLock().unlock();
603	>	}
604	>
605	>
606	>
607	>	/**
608	>	* Fair write tryLock fails when readlocked
609	>	*/
610	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
611	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
612	>	lock.readLock().lock();
613	>	Thread t = newStartedThread(new CheckedRunnable() {
614	>	public void realRun() {
615	>	assertFalse(lock.writeLock().tryLock());
616	>	}});
617	>
618	>	awaitTermination(t, LONG_DELAY_MS);
619	>	lock.readLock().unlock();
620	>	}
621	>
622	>
623	>
624	>	/**
625	>	* write timed tryLock times out if locked
626	>	*/
627	>	public void testWriteTryLock_Timeout() throws InterruptedException {
628	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
629	>	lock.writeLock().lock();
630	>	Thread t = newStartedThread(new CheckedRunnable() {
631	>	public void realRun() throws InterruptedException {
632	>	assertFalse(lock.writeLock().tryLock(1, MILLISECONDS));
633	>	}});
634	>
635	>	awaitTermination(t, LONG_DELAY_MS);
636	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
637	>	lock.writeLock().unlock();
638	>	}
639	>
640	>	/**
641	>	* read timed tryLock times out if write-locked
642	>	*/
643	>	public void testReadTryLock_Timeout() throws InterruptedException {
644	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
645	>	lock.writeLock().lock();
646	>	Thread t = newStartedThread(new CheckedRunnable() {
647	>	public void realRun() throws InterruptedException {
648	>	assertFalse(lock.readLock().tryLock(1, MILLISECONDS));
649	>	}});
650	>
651	>	awaitTermination(t, LONG_DELAY_MS);
652	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
653	>	lock.writeLock().unlock();
654	>	}
655	>
656	>
657	>	/**
658	>	* write lockInterruptibly succeeds if lock free else is interruptible
659	>	*/
660	>	public void testWriteLockInterruptibly() throws InterruptedException {
661	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
662	>	lock.writeLock().lockInterruptibly();
663	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
664	>	public void realRun() throws InterruptedException {
665	>	lock.writeLock().lockInterruptibly();
666	>	}});
667	>
668	>	Thread.sleep(SHORT_DELAY_MS);
669	>	t.interrupt();
670	>	awaitTermination(t, LONG_DELAY_MS);
671	>	releaseWriteLock(lock);
672	>	}
673	>
674	>	/**
675	>	* read lockInterruptibly succeeds if lock free else is interruptible
676	>	*/
677	>	public void testReadLockInterruptibly() throws InterruptedException {
678	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
679	>	lock.writeLock().lockInterruptibly();
680	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
681	>	public void realRun() throws InterruptedException {
682	>	lock.readLock().lockInterruptibly();
683	>	}});
684	>
685	>	Thread.sleep(SHORT_DELAY_MS);
686	>	t.interrupt();
687	>	awaitTermination(t, LONG_DELAY_MS);
688	>	releaseWriteLock(lock);
689		}
690
691		/**
692		* Calling await without holding lock throws IllegalMonitorStateException
693		*/
694	<	public void testAwait_IllegalMonitor() {
695	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
694	>	public void testAwait_IllegalMonitor() throws InterruptedException {
695	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
696		final Condition c = lock.writeLock().newCondition();
697		try {
698		c.await();
699		shouldThrow();
700	<	}
447	<	catch (IllegalMonitorStateException success) {
448	<	}
449	<	catch (Exception ex) {
450	<	shouldThrow();
451	<	}
700	>	} catch (IllegalMonitorStateException success) {}
701		}
702
703		/**
704		* Calling signal without holding lock throws IllegalMonitorStateException
705		*/
706		public void testSignal_IllegalMonitor() {
707	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
707	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
708		final Condition c = lock.writeLock().newCondition();
709		try {
710		c.signal();
711		shouldThrow();
712	<	}
464	<	catch (IllegalMonitorStateException success) {
465	<	}
466	<	catch (Exception ex) {
467	<	unexpectedException();
468	<	}
712	>	} catch (IllegalMonitorStateException success) {}
713		}
714
715		/**
716		* awaitNanos without a signal times out
717		*/
718	<	public void testAwaitNanos_Timeout() {
719	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
718	>	public void testAwaitNanos_Timeout() throws InterruptedException {
719	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
720		final Condition c = lock.writeLock().newCondition();
721	<	try {
722	<	lock.writeLock().lock();
723	<	long t = c.awaitNanos(100);
724	<	assertTrue(t <= 0);
725	<	lock.writeLock().unlock();
482	<	}
483	<	catch (Exception ex) {
484	<	unexpectedException();
485	<	}
721	>
722	>	lock.writeLock().lock();
723	>	long t = c.awaitNanos(100);
724	>	assertTrue(t <= 0);
725	>	lock.writeLock().unlock();
726		}
727
728
729		/**
730	<	*  timed await without a signal times out
730	>	* timed await without a signal times out
731		*/
732	<	public void testAwait_Timeout() {
733	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
732	>	public void testAwait_Timeout() throws InterruptedException {
733	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
734		final Condition c = lock.writeLock().newCondition();
735	<	try {
736	<	lock.writeLock().lock();
737	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
498	<	lock.writeLock().unlock();
499	<	}
500	<	catch (Exception ex) {
501	<	unexpectedException();
502	<	}
735	>	lock.writeLock().lock();
736	>	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
737	>	lock.writeLock().unlock();
738		}
739
740		/**
741		* awaitUntil without a signal times out
742		*/
743	<	public void testAwaitUntil_Timeout() {
744	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
743	>	public void testAwaitUntil_Timeout() throws InterruptedException {
744	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
745		final Condition c = lock.writeLock().newCondition();
746	<	try {
747	<	lock.writeLock().lock();
748	<	java.util.Date d = new java.util.Date();
749	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
515	<	lock.writeLock().unlock();
516	<	}
517	<	catch (Exception ex) {
518	<	unexpectedException();
519	<	}
746	>	lock.writeLock().lock();
747	>	java.util.Date d = new java.util.Date();
748	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
749	>	lock.writeLock().unlock();
750		}
751
752		/**
753		* await returns when signalled
754		*/
755	<	public void testAwait() {
756	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
755	>	public void testAwait() throws InterruptedException {
756	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
757		final Condition c = lock.writeLock().newCondition();
758	<	Thread t = new Thread(new Runnable() {
759	<	public void run() {
760	<	try {
761	<	lock.writeLock().lock();
762	<	c.await();
763	<	lock.writeLock().unlock();
764	<	}
765	<	catch(InterruptedException e) {
766	<	threadUnexpectedException();
767	<	}
768	<	}
769	<	});
758	>	Thread t = newStartedThread(new CheckedRunnable() {
759	>	public void realRun() throws InterruptedException {
760	>	lock.writeLock().lock();
761	>	c.await();
762	>	lock.writeLock().unlock();
763	>	}});
764	>
765	>	Thread.sleep(SHORT_DELAY_MS);
766	>	lock.writeLock().lock();
767	>	c.signal();
768	>	lock.writeLock().unlock();
769	>	awaitTermination(t, LONG_DELAY_MS);
770	>	}
771	>
772	>	/** A helper class for uninterruptible wait tests */
773	>	class UninterruptableThread extends Thread {
774	>	private Lock lock;
775	>	private Condition c;
776	>
777	>	public volatile boolean canAwake = false;
778	>	public volatile boolean interrupted = false;
779	>	public volatile boolean lockStarted = false;
780	>
781	>	public UninterruptableThread(Lock lock, Condition c) {
782	>	this.lock = lock;
783	>	this.c = c;
784	>	}
785	>
786	>	public synchronized void run() {
787	>	lock.lock();
788	>	lockStarted = true;
789	>
790	>	while (!canAwake) {
791	>	c.awaitUninterruptibly();
792	>	}
793
794	<	try {
795	<	t.start();
543	<	Thread.sleep(SHORT_DELAY_MS);
544	<	lock.writeLock().lock();
545	<	c.signal();
546	<	lock.writeLock().unlock();
547	<	t.join(SHORT_DELAY_MS);
548	<	assertFalse(t.isAlive());
549	<	}
550	<	catch (Exception ex) {
551	<	unexpectedException();
794	>	interrupted = isInterrupted();
795	>	lock.unlock();
796		}
797		}
798
799		/**
800		* awaitUninterruptibly doesn't abort on interrupt
801		*/
802	<	public void testAwaitUninterruptibly() {
803	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
802	>	public void testAwaitUninterruptibly() throws InterruptedException {
803	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
804		final Condition c = lock.writeLock().newCondition();
805	<	Thread t = new Thread(new Runnable() {
806	<	public void run() {
807	<	lock.writeLock().lock();
564	<	c.awaitUninterruptibly();
565	<	lock.writeLock().unlock();
566	<	}
567	<	});
805	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
806	>
807	>	thread.start();
808
809	+	while (!thread.lockStarted) {
810	+	Thread.sleep(100);
811	+	}
812	+
813	+	lock.writeLock().lock();
814		try {
815	<	t.start();
816	<	Thread.sleep(SHORT_DELAY_MS);
572	<	t.interrupt();
573	<	lock.writeLock().lock();
815	>	thread.interrupt();
816	>	thread.canAwake = true;
817		c.signal();
818	+	} finally {
819		lock.writeLock().unlock();
576	–	assert(t.isInterrupted());
577	–	t.join(SHORT_DELAY_MS);
578	–	assertFalse(t.isAlive());
579	–	}
580	–	catch (Exception ex) {
581	–	unexpectedException();
820		}
821	+
822	+	awaitTermination(thread, LONG_DELAY_MS);
823	+	assertTrue(thread.interrupted);
824		}
825
826		/**
827		* await is interruptible
828		*/
829	<	public void testAwait_Interrupt() {
830	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
829	>	public void testAwait_Interrupt() throws InterruptedException {
830	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
831		final Condition c = lock.writeLock().newCondition();
832	<	Thread t = new Thread(new Runnable() {
833	<	public void run() {
834	<	try {
835	<	lock.writeLock().lock();
836	<	c.await();
837	<	lock.writeLock().unlock();
838	<	threadShouldThrow();
839	<	}
840	<	catch(InterruptedException success) {
841	<	}
842	<	}
843	<	});
844	<
845	<	try {
846	<	t.start();
847	<	Thread.sleep(SHORT_DELAY_MS);
607	<	t.interrupt();
608	<	t.join(SHORT_DELAY_MS);
609	<	assertFalse(t.isAlive());
610	<	}
611	<	catch (Exception ex) {
612	<	unexpectedException();
613	<	}
832	>	final CountDownLatch locked = new CountDownLatch(1);
833	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
834	>	public void realRun() throws InterruptedException {
835	>	lock.writeLock().lock();
836	>	assertTrue(lock.isWriteLocked());
837	>	locked.countDown();
838	>	try { c.await(); }
839	>	finally { lock.writeLock().unlock(); }
840	>	}});
841	>
842	>	locked.await();
843	>	while (lock.isWriteLocked())
844	>	Thread.yield();
845	>	t.interrupt();
846	>	awaitTermination(t, LONG_DELAY_MS);
847	>	assertFalse(lock.isWriteLocked());
848		}
849
850		/**
851		* awaitNanos is interruptible
852		*/
853	<	public void testAwaitNanos_Interrupt() {
854	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
853	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
854	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
855		final Condition c = lock.writeLock().newCondition();
856	<	Thread t = new Thread(new Runnable() {
857	<	public void run() {
858	<	try {
859	<	lock.writeLock().lock();
860	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
861	<	lock.writeLock().unlock();
862	<	threadShouldThrow();
863	<	}
864	<	catch(InterruptedException success) {
865	<	}
866	<	}
867	<	});
868	<
869	<	try {
870	<	t.start();
871	<	Thread.sleep(SHORT_DELAY_MS);
638	<	t.interrupt();
639	<	t.join(SHORT_DELAY_MS);
640	<	assertFalse(t.isAlive());
641	<	}
642	<	catch (Exception ex) {
643	<	unexpectedException();
644	<	}
856	>	final CountDownLatch locked = new CountDownLatch(1);
857	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
858	>	public void realRun() throws InterruptedException {
859	>	lock.writeLock().lock();
860	>	assertTrue(lock.isWriteLocked());
861	>	locked.countDown();
862	>	try { c.awaitNanos(MILLISECONDS.toNanos(LONG_DELAY_MS)); }
863	>	finally { lock.writeLock().unlock(); }
864	>	}});
865	>
866	>	locked.await();
867	>	while (lock.isWriteLocked())
868	>	Thread.yield();
869	>	t.interrupt();
870	>	awaitTermination(t, LONG_DELAY_MS);
871	>	assertFalse(lock.isWriteLocked());
872		}
873
874		/**
875		* awaitUntil is interruptible
876		*/
877	<	public void testAwaitUntil_Interrupt() {
878	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
877	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
878	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
879		final Condition c = lock.writeLock().newCondition();
880	<	Thread t = new Thread(new Runnable() {
881	<	public void run() {
882	<	try {
883	<	lock.writeLock().lock();
884	<	java.util.Date d = new java.util.Date();
885	<	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
886	<	lock.writeLock().unlock();
887	<	threadShouldThrow();
888	<	}
889	<	catch(InterruptedException success) {
890	<	}
891	<	}
892	<	});
893	<
894	<	try {
895	<	t.start();
896	<	Thread.sleep(SHORT_DELAY_MS);
670	<	t.interrupt();
671	<	t.join(SHORT_DELAY_MS);
672	<	assertFalse(t.isAlive());
673	<	}
674	<	catch (Exception ex) {
675	<	unexpectedException();
676	<	}
880	>	final CountDownLatch locked = new CountDownLatch(1);
881	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
882	>	public void realRun() throws InterruptedException {
883	>	lock.writeLock().lock();
884	>	assertTrue(lock.isWriteLocked());
885	>	locked.countDown();
886	>	java.util.Date d = new java.util.Date();
887	>	try { c.awaitUntil(new java.util.Date(d.getTime() + 10000)); }
888	>	finally { lock.writeLock().unlock(); }
889	>	}});
890	>
891	>	locked.await();
892	>	while (lock.isWriteLocked())
893	>	Thread.yield();
894	>	t.interrupt();
895	>	awaitTermination(t, LONG_DELAY_MS);
896	>	assertFalse(lock.isWriteLocked());
897		}
898
899		/**
900		* signalAll wakes up all threads
901		*/
902	<	public void testSignalAll() {
903	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
902	>	public void testSignalAll() throws InterruptedException {
903	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
904		final Condition c = lock.writeLock().newCondition();
905	<	Thread t1 = new Thread(new Runnable() {
906	<	public void run() {
907	<	try {
908	<	lock.writeLock().lock();
909	<	c.await();
910	<	lock.writeLock().unlock();
911	<	}
912	<	catch(InterruptedException e) {
913	<	threadUnexpectedException();
914	<	}
915	<	}
916	<	});
917	<
918	<	Thread t2 = new Thread(new Runnable() {
919	<	public void run() {
920	<	try {
921	<	lock.writeLock().lock();
922	<	c.await();
923	<	lock.writeLock().unlock();
924	<	}
705	<	catch(InterruptedException e) {
706	<	threadUnexpectedException();
707	<	}
708	<	}
709	<	});
710	<
711	<	try {
712	<	t1.start();
713	<	t2.start();
714	<	Thread.sleep(SHORT_DELAY_MS);
715	<	lock.writeLock().lock();
716	<	c.signalAll();
717	<	lock.writeLock().unlock();
718	<	t1.join(SHORT_DELAY_MS);
719	<	t2.join(SHORT_DELAY_MS);
720	<	assertFalse(t1.isAlive());
721	<	assertFalse(t2.isAlive());
722	<	}
723	<	catch (Exception ex) {
724	<	unexpectedException();
725	<	}
905	>	Thread t1 = newStartedThread(new CheckedRunnable() {
906	>	public void realRun() throws InterruptedException {
907	>	lock.writeLock().lock();
908	>	c.await();
909	>	lock.writeLock().unlock();
910	>	}});
911	>
912	>	Thread t2 = newStartedThread(new CheckedRunnable() {
913	>	public void realRun() throws InterruptedException {
914	>	lock.writeLock().lock();
915	>	c.await();
916	>	lock.writeLock().unlock();
917	>	}});
918	>
919	>	Thread.sleep(SHORT_DELAY_MS);
920	>	lock.writeLock().lock();
921	>	c.signalAll();
922	>	lock.writeLock().unlock();
923	>	awaitTermination(t1, LONG_DELAY_MS);
924	>	awaitTermination(t2, LONG_DELAY_MS);
925		}
926
927		/**
928		* A serialized lock deserializes as unlocked
929		*/
930	<	public void testSerialization() {
930	>	public void testSerialization() throws Exception {
931		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
932		l.readLock().lock();
933		l.readLock().unlock();
934
935	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
936	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
937	+	out.writeObject(l);
938	+	out.close();
939	+
940	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
941	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
942	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
943	+	r.readLock().lock();
944	+	r.readLock().unlock();
945	+	}
946	+
947	+	/**
948	+	* hasQueuedThreads reports whether there are waiting threads
949	+	*/
950	+	public void testhasQueuedThreads() throws InterruptedException {
951	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
952	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
953	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
954	+	assertFalse(lock.hasQueuedThreads());
955	+	lock.writeLock().lock();
956	+	t1.start();
957	+	Thread.sleep(SHORT_DELAY_MS);
958	+	assertTrue(lock.hasQueuedThreads());
959	+	t2.start();
960	+	Thread.sleep(SHORT_DELAY_MS);
961	+	assertTrue(lock.hasQueuedThreads());
962	+	t1.interrupt();
963	+	Thread.sleep(SHORT_DELAY_MS);
964	+	assertTrue(lock.hasQueuedThreads());
965	+	lock.writeLock().unlock();
966	+	Thread.sleep(SHORT_DELAY_MS);
967	+	assertFalse(lock.hasQueuedThreads());
968	+	awaitTermination(t1, LONG_DELAY_MS);
969	+	awaitTermination(t2, LONG_DELAY_MS);
970	+	}
971	+
972	+	/**
973	+	* hasQueuedThread(null) throws NPE
974	+	*/
975	+	public void testHasQueuedThreadNPE() {
976	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
977		try {
978	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
979	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
980	<	out.writeObject(l);
740	<	out.close();
741	<
742	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
743	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
744	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
745	<	r.readLock().lock();
746	<	r.readLock().unlock();
747	<	} catch(Exception e){
748	<	e.printStackTrace();
749	<	unexpectedException();
750	<	}
978	>	sync.hasQueuedThread(null);
979	>	shouldThrow();
980	>	} catch (NullPointerException success) {}
981		}
982
983	+	/**
984	+	* hasQueuedThread reports whether a thread is queued.
985	+	*/
986	+	public void testHasQueuedThread() throws InterruptedException {
987	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
988	+	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
989	+	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
990	+	assertFalse(sync.hasQueuedThread(t1));
991	+	assertFalse(sync.hasQueuedThread(t2));
992	+	sync.writeLock().lock();
993	+	t1.start();
994	+	Thread.sleep(SHORT_DELAY_MS);
995	+	assertTrue(sync.hasQueuedThread(t1));
996	+	t2.start();
997	+	Thread.sleep(SHORT_DELAY_MS);
998	+	assertTrue(sync.hasQueuedThread(t1));
999	+	assertTrue(sync.hasQueuedThread(t2));
1000	+	t1.interrupt();
1001	+	Thread.sleep(SHORT_DELAY_MS);
1002	+	assertFalse(sync.hasQueuedThread(t1));
1003	+	assertTrue(sync.hasQueuedThread(t2));
1004	+	sync.writeLock().unlock();
1005	+	Thread.sleep(SHORT_DELAY_MS);
1006	+	assertFalse(sync.hasQueuedThread(t1));
1007	+	Thread.sleep(SHORT_DELAY_MS);
1008	+	assertFalse(sync.hasQueuedThread(t2));
1009	+	awaitTermination(t1, LONG_DELAY_MS);
1010	+	awaitTermination(t2, LONG_DELAY_MS);
1011	+	}
1012	+
1013	+
1014	+	/**
1015	+	* getQueueLength reports number of waiting threads
1016	+	*/
1017	+	public void testGetQueueLength() throws InterruptedException {
1018	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1019	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1020	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1021	+	assertEquals(0, lock.getQueueLength());
1022	+	lock.writeLock().lock();
1023	+	t1.start();
1024	+	Thread.sleep(SHORT_DELAY_MS);
1025	+	assertEquals(1, lock.getQueueLength());
1026	+	t2.start();
1027	+	Thread.sleep(SHORT_DELAY_MS);
1028	+	assertEquals(2, lock.getQueueLength());
1029	+	t1.interrupt();
1030	+	Thread.sleep(SHORT_DELAY_MS);
1031	+	assertEquals(1, lock.getQueueLength());
1032	+	lock.writeLock().unlock();
1033	+	Thread.sleep(SHORT_DELAY_MS);
1034	+	assertEquals(0, lock.getQueueLength());
1035	+	awaitTermination(t1, LONG_DELAY_MS);
1036	+	awaitTermination(t2, LONG_DELAY_MS);
1037	+	}
1038	+
1039	+	/**
1040	+	* getQueuedThreads includes waiting threads
1041	+	*/
1042	+	public void testGetQueuedThreads() throws InterruptedException {
1043	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1044	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1045	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1046	+	assertTrue(lock.getQueuedThreads().isEmpty());
1047	+	lock.writeLock().lock();
1048	+	assertTrue(lock.getQueuedThreads().isEmpty());
1049	+	t1.start();
1050	+	Thread.sleep(SHORT_DELAY_MS);
1051	+	assertTrue(lock.getQueuedThreads().contains(t1));
1052	+	t2.start();
1053	+	Thread.sleep(SHORT_DELAY_MS);
1054	+	assertTrue(lock.getQueuedThreads().contains(t1));
1055	+	assertTrue(lock.getQueuedThreads().contains(t2));
1056	+	t1.interrupt();
1057	+	Thread.sleep(SHORT_DELAY_MS);
1058	+	assertFalse(lock.getQueuedThreads().contains(t1));
1059	+	assertTrue(lock.getQueuedThreads().contains(t2));
1060	+	lock.writeLock().unlock();
1061	+	Thread.sleep(SHORT_DELAY_MS);
1062	+	assertTrue(lock.getQueuedThreads().isEmpty());
1063	+	awaitTermination(t1, LONG_DELAY_MS);
1064	+	awaitTermination(t2, LONG_DELAY_MS);
1065	+	}
1066	+
1067	+	/**
1068	+	* hasWaiters throws NPE if null
1069	+	*/
1070	+	public void testHasWaitersNPE() {
1071	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1072	+	try {
1073	+	lock.hasWaiters(null);
1074	+	shouldThrow();
1075	+	} catch (NullPointerException success) {}
1076	+	}
1077	+
1078	+	/**
1079	+	* getWaitQueueLength throws NPE if null
1080	+	*/
1081	+	public void testGetWaitQueueLengthNPE() {
1082	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1083	+	try {
1084	+	lock.getWaitQueueLength(null);
1085	+	shouldThrow();
1086	+	} catch (NullPointerException success) {}
1087	+	}
1088	+
1089	+
1090	+	/**
1091	+	* getWaitingThreads throws NPE if null
1092	+	*/
1093	+	public void testGetWaitingThreadsNPE() {
1094	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1095	+	try {
1096	+	lock.getWaitingThreads(null);
1097	+	shouldThrow();
1098	+	} catch (NullPointerException success) {}
1099	+	}
1100	+
1101	+	/**
1102	+	* hasWaiters throws IAE if not owned
1103	+	*/
1104	+	public void testHasWaitersIAE() {
1105	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1106	+	final Condition c = lock.writeLock().newCondition();
1107	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1108	+	try {
1109	+	lock2.hasWaiters(c);
1110	+	shouldThrow();
1111	+	} catch (IllegalArgumentException success) {}
1112	+	}
1113	+
1114	+	/**
1115	+	* hasWaiters throws IMSE if not locked
1116	+	*/
1117	+	public void testHasWaitersIMSE() {
1118	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1119	+	final Condition c = lock.writeLock().newCondition();
1120	+	try {
1121	+	lock.hasWaiters(c);
1122	+	shouldThrow();
1123	+	} catch (IllegalMonitorStateException success) {}
1124	+	}
1125	+
1126	+
1127	+	/**
1128	+	* getWaitQueueLength throws IAE if not owned
1129	+	*/
1130	+	public void testGetWaitQueueLengthIAE() {
1131	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1132	+	final Condition c = lock.writeLock().newCondition();
1133	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1134	+	try {
1135	+	lock2.getWaitQueueLength(c);
1136	+	shouldThrow();
1137	+	} catch (IllegalArgumentException success) {}
1138	+	}
1139	+
1140	+	/**
1141	+	* getWaitQueueLength throws IMSE if not locked
1142	+	*/
1143	+	public void testGetWaitQueueLengthIMSE() {
1144	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1145	+	final Condition c = lock.writeLock().newCondition();
1146	+	try {
1147	+	lock.getWaitQueueLength(c);
1148	+	shouldThrow();
1149	+	} catch (IllegalMonitorStateException success) {}
1150	+	}
1151	+
1152	+
1153	+	/**
1154	+	* getWaitingThreads throws IAE if not owned
1155	+	*/
1156	+	public void testGetWaitingThreadsIAE() {
1157	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1158	+	final Condition c = lock.writeLock().newCondition();
1159	+	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1160	+	try {
1161	+	lock2.getWaitingThreads(c);
1162	+	shouldThrow();
1163	+	} catch (IllegalArgumentException success) {}
1164	+	}
1165	+
1166	+	/**
1167	+	* getWaitingThreads throws IMSE if not locked
1168	+	*/
1169	+	public void testGetWaitingThreadsIMSE() {
1170	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1171	+	final Condition c = lock.writeLock().newCondition();
1172	+	try {
1173	+	lock.getWaitingThreads(c);
1174	+	shouldThrow();
1175	+	} catch (IllegalMonitorStateException success) {}
1176	+	}
1177	+
1178	+
1179	+	/**
1180	+	* hasWaiters returns true when a thread is waiting, else false
1181	+	*/
1182	+	public void testHasWaiters() throws InterruptedException {
1183	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1184	+	final Condition c = lock.writeLock().newCondition();
1185	+	Thread t = newStartedThread(new CheckedRunnable() {
1186	+	public void realRun() throws InterruptedException {
1187	+	lock.writeLock().lock();
1188	+	assertFalse(lock.hasWaiters(c));
1189	+	assertEquals(0, lock.getWaitQueueLength(c));
1190	+	c.await();
1191	+	lock.writeLock().unlock();
1192	+	}});
1193	+
1194	+	Thread.sleep(SHORT_DELAY_MS);
1195	+	lock.writeLock().lock();
1196	+	assertTrue(lock.hasWaiters(c));
1197	+	assertEquals(1, lock.getWaitQueueLength(c));
1198	+	c.signal();
1199	+	lock.writeLock().unlock();
1200	+	Thread.sleep(SHORT_DELAY_MS);
1201	+	lock.writeLock().lock();
1202	+	assertFalse(lock.hasWaiters(c));
1203	+	assertEquals(0, lock.getWaitQueueLength(c));
1204	+	lock.writeLock().unlock();
1205	+	awaitTermination(t, LONG_DELAY_MS);
1206	+	}
1207	+
1208	+	/**
1209	+	* getWaitQueueLength returns number of waiting threads
1210	+	*/
1211	+	public void testGetWaitQueueLength() throws InterruptedException {
1212	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1213	+	final Condition c = lock.writeLock().newCondition();
1214	+	Thread t = newStartedThread(new CheckedRunnable() {
1215	+	public void realRun() throws InterruptedException {
1216	+	lock.writeLock().lock();
1217	+	assertFalse(lock.hasWaiters(c));
1218	+	assertEquals(0, lock.getWaitQueueLength(c));
1219	+	c.await();
1220	+	lock.writeLock().unlock();
1221	+	}});
1222	+
1223	+	Thread.sleep(SHORT_DELAY_MS);
1224	+	lock.writeLock().lock();
1225	+	assertTrue(lock.hasWaiters(c));
1226	+	assertEquals(1, lock.getWaitQueueLength(c));
1227	+	c.signal();
1228	+	lock.writeLock().unlock();
1229	+	Thread.sleep(SHORT_DELAY_MS);
1230	+	lock.writeLock().lock();
1231	+	assertFalse(lock.hasWaiters(c));
1232	+	assertEquals(0, lock.getWaitQueueLength(c));
1233	+	lock.writeLock().unlock();
1234	+	awaitTermination(t, LONG_DELAY_MS);
1235	+	}
1236	+
1237	+
1238	+	/**
1239	+	* getWaitingThreads returns only and all waiting threads
1240	+	*/
1241	+	public void testGetWaitingThreads() throws InterruptedException {
1242	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1243	+	final Condition c = lock.writeLock().newCondition();
1244	+	Thread t1 = new Thread(new CheckedRunnable() {
1245	+	public void realRun() throws InterruptedException {
1246	+	lock.writeLock().lock();
1247	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1248	+	c.await();
1249	+	lock.writeLock().unlock();
1250	+	}});
1251	+
1252	+	Thread t2 = new Thread(new CheckedRunnable() {
1253	+	public void realRun() throws InterruptedException {
1254	+	lock.writeLock().lock();
1255	+	assertFalse(lock.getWaitingThreads(c).isEmpty());
1256	+	c.await();
1257	+	lock.writeLock().unlock();
1258	+	}});
1259	+
1260	+	lock.writeLock().lock();
1261	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1262	+	lock.writeLock().unlock();
1263	+	t1.start();
1264	+	Thread.sleep(SHORT_DELAY_MS);
1265	+	t2.start();
1266	+	Thread.sleep(SHORT_DELAY_MS);
1267	+	lock.writeLock().lock();
1268	+	assertTrue(lock.hasWaiters(c));
1269	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1270	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1271	+	c.signalAll();
1272	+	lock.writeLock().unlock();
1273	+	Thread.sleep(SHORT_DELAY_MS);
1274	+	lock.writeLock().lock();
1275	+	assertFalse(lock.hasWaiters(c));
1276	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1277	+	lock.writeLock().unlock();
1278	+	awaitTermination(t1, LONG_DELAY_MS);
1279	+	awaitTermination(t2, LONG_DELAY_MS);
1280	+	}
1281	+
1282	+	/**
1283	+	* toString indicates current lock state
1284	+	*/
1285	+	public void testToString() {
1286	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1287	+	String us = lock.toString();
1288	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1289	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1290	+	lock.writeLock().lock();
1291	+	String ws = lock.toString();
1292	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1293	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1294	+	lock.writeLock().unlock();
1295	+	lock.readLock().lock();
1296	+	lock.readLock().lock();
1297	+	String rs = lock.toString();
1298	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1299	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1300	+	}
1301	+
1302	+	/**
1303	+	* readLock.toString indicates current lock state
1304	+	*/
1305	+	public void testReadLockToString() {
1306	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1307	+	String us = lock.readLock().toString();
1308	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1309	+	lock.readLock().lock();
1310	+	lock.readLock().lock();
1311	+	String rs = lock.readLock().toString();
1312	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1313	+	}
1314	+
1315	+	/**
1316	+	* writeLock.toString indicates current lock state
1317	+	*/
1318	+	public void testWriteLockToString() {
1319	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1320	+	String us = lock.writeLock().toString();
1321	+	assertTrue(us.indexOf("Unlocked") >= 0);
1322	+	lock.writeLock().lock();
1323	+	String ls = lock.writeLock().toString();
1324	+	assertTrue(ls.indexOf("Locked") >= 0);
1325	+	}
1326
1327		}

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