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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.6 by dl, Mon Nov 10 13:32:08 2003 UTC vs.
Revision 1.59 by jsr166, Sat May 7 19:03:26 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.atomic.AtomicBoolean;
11		import java.util.concurrent.locks.*;
12		import java.util.concurrent.*;
13	+	import static java.util.concurrent.TimeUnit.MILLISECONDS;
14		import java.io.*;
15		import java.util.*;
16
17		public class ReentrantReadWriteLockTest extends JSR166TestCase {
18		public static void main(String[] args) {
19	<	junit.textui.TestRunner.run (suite());
19	>	junit.textui.TestRunner.run(suite());
20		}
21		public static Test suite() {
22	<	return new TestSuite(ReentrantReadWriteLockTest.class);
22	>	return new TestSuite(ReentrantReadWriteLockTest.class);
23		}
24
25		/**
26		* A runnable calling lockInterruptibly
27		*/
28	<	class InterruptibleLockRunnable implements Runnable {
28	>	class InterruptibleLockRunnable extends CheckedRunnable {
29		final ReentrantReadWriteLock lock;
30		InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
31	<	public void run() {
32	<	try {
30	<	lock.writeLock().lockInterruptibly();
31	<	} catch(InterruptedException success){}
31	>	public void realRun() throws InterruptedException {
32	>	lock.writeLock().lockInterruptibly();
33		}
34		}
35
35	–
36		/**
37		* A runnable calling lockInterruptibly that expects to be
38		* interrupted
39		*/
40	<	class InterruptedLockRunnable implements Runnable {
40	>	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
41		final ReentrantReadWriteLock lock;
42		InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
43	<	public void run() {
44	<	try {
45	<	lock.writeLock().lockInterruptibly();
46	<	threadShouldThrow();
47	<	} catch(InterruptedException success){}
43	>	public void realRun() throws InterruptedException {
44	>	lock.writeLock().lockInterruptibly();
45		}
46		}
47
#	Line 53 | Line 50 | public class ReentrantReadWriteLockTest
50		*/
51		static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
52		PublicReentrantReadWriteLock() { super(); }
53	<	public Collection<Thread> getQueuedThreads() {
54	<	return super.getQueuedThreads();
53	>	PublicReentrantReadWriteLock(boolean fair) { super(fair); }
54	>	public Thread getOwner() {
55	>	return super.getOwner();
56		}
57	<	public WriterConditionObject newCondition() {
58	<	return new PublicCondition(this);
57	>	public Collection<Thread> getQueuedThreads() {
58	>	return super.getQueuedThreads();
59		}
60	<
61	<	static class PublicCondition extends ReentrantReadWriteLock.WriterConditionObject {
64	<	PublicCondition(PublicReentrantReadWriteLock l) { super(l); }
65	<	public Collection<Thread> getWaitingThreads() {
66	<	return super.getWaitingThreads();
67	<	}
60	>	public Collection<Thread> getWaitingThreads(Condition c) {
61	>	return super.getWaitingThreads(c);
62		}
69	–
63		}
64
65		/**
66	<	* Constructor sets given fairness, and is in unlocked state
66	>	* Releases write lock, checking that it had a hold count of 1.
67		*/
68	<	public void testConstructor() {
69	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
70	<	assertFalse(rl.isFair());
71	<	assertFalse(rl.isWriteLocked());
72	<	assertEquals(0, rl.getReadLocks());
73	<	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
81	<	assertTrue(r2.isFair());
82	<	assertFalse(r2.isWriteLocked());
83	<	assertEquals(0, r2.getReadLocks());
68	>	void releaseWriteLock(PublicReentrantReadWriteLock lock) {
69	>	ReentrantReadWriteLock.WriteLock writeLock = lock.writeLock();
70	>	assertWriteLockedBy(lock, Thread.currentThread());
71	>	assertEquals(1, lock.getWriteHoldCount());
72	>	writeLock.unlock();
73	>	assertNotWriteLocked(lock);
74		}
75
76		/**
77	<	* write-locking and read-locking an unlocked lock succeed
77	>	* Spin-waits until lock.hasQueuedThread(t) becomes true.
78		*/
79	<	public void testLock() {
80	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
81	<	rl.writeLock().lock();
82	<	assertTrue(rl.isWriteLocked());
83	<	assertTrue(rl.isWriteLockedByCurrentThread());
84	<	assertEquals(0, rl.getReadLocks());
85	<	rl.writeLock().unlock();
86	<	assertFalse(rl.isWriteLocked());
87	<	assertFalse(rl.isWriteLockedByCurrentThread());
98	<	assertEquals(0, rl.getReadLocks());
99	<	rl.readLock().lock();
100	<	assertFalse(rl.isWriteLocked());
101	<	assertFalse(rl.isWriteLockedByCurrentThread());
102	<	assertEquals(1, rl.getReadLocks());
103	<	rl.readLock().unlock();
104	<	assertFalse(rl.isWriteLocked());
105	<	assertFalse(rl.isWriteLockedByCurrentThread());
106	<	assertEquals(0, rl.getReadLocks());
79	>	void waitForQueuedThread(PublicReentrantReadWriteLock lock, Thread t) {
80	>	long startTime = System.nanoTime();
81	>	while (!lock.hasQueuedThread(t)) {
82	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
83	>	throw new AssertionError("timed out");
84	>	Thread.yield();
85	>	}
86	>	assertTrue(t.isAlive());
87	>	assertTrue(lock.getOwner() != t);
88		}
89
90	+	/**
91	+	* Checks that lock is not write-locked.
92	+	*/
93	+	void assertNotWriteLocked(PublicReentrantReadWriteLock lock) {
94	+	assertFalse(lock.isWriteLocked());
95	+	assertFalse(lock.isWriteLockedByCurrentThread());
96	+	assertFalse(lock.writeLock().isHeldByCurrentThread());
97	+	assertNull(lock.getOwner());
98	+	assertEquals(0, lock.getWriteHoldCount());
99	+	}
100
101		/**
102	<	* locking an unlocked fair lock succeeds
102	>	* Checks that lock is write-locked by the given thread.
103		*/
104	<	public void testFairLock() {
105	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
106	<	rl.writeLock().lock();
107	<	assertTrue(rl.isWriteLocked());
108	<	assertTrue(rl.isWriteLockedByCurrentThread());
109	<	assertEquals(0, rl.getReadLocks());
110	<	rl.writeLock().unlock();
111	<	assertFalse(rl.isWriteLocked());
112	<	assertFalse(rl.isWriteLockedByCurrentThread());
113	<	assertEquals(0, rl.getReadLocks());
123	<	rl.readLock().lock();
124	<	assertFalse(rl.isWriteLocked());
125	<	assertFalse(rl.isWriteLockedByCurrentThread());
126	<	assertEquals(1, rl.getReadLocks());
127	<	rl.readLock().unlock();
128	<	assertFalse(rl.isWriteLocked());
129	<	assertFalse(rl.isWriteLockedByCurrentThread());
130	<	assertEquals(0, rl.getReadLocks());
104	>	void assertWriteLockedBy(PublicReentrantReadWriteLock lock, Thread t) {
105	>	assertTrue(lock.isWriteLocked());
106	>	assertSame(t, lock.getOwner());
107	>	assertEquals(t == Thread.currentThread(),
108	>	lock.isWriteLockedByCurrentThread());
109	>	assertEquals(t == Thread.currentThread(),
110	>	lock.writeLock().isHeldByCurrentThread());
111	>	assertEquals(t == Thread.currentThread(),
112	>	lock.getWriteHoldCount() > 0);
113	>	assertEquals(0, lock.getReadLockCount());
114		}
115
116		/**
117	<	* getWriteHoldCount returns number of recursive holds
117	>	* Checks that condition c has no waiters.
118		*/
119	<	public void testGetHoldCount() {
120	<	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
138	<	for(int i = 1; i <= SIZE; i++) {
139	<	lock.writeLock().lock();
140	<	assertEquals(i,lock.getWriteHoldCount());
141	<	}
142	<	for(int i = SIZE; i > 0; i--) {
143	<	lock.writeLock().unlock();
144	<	assertEquals(i-1,lock.getWriteHoldCount());
145	<	}
119	>	void assertHasNoWaiters(PublicReentrantReadWriteLock lock, Condition c) {
120	>	assertHasWaiters(lock, c, new Thread[] {});
121		}
147	–
122
123		/**
124	<	* write-unlocking an unlocked lock throws IllegalMonitorStateException
124	>	* Checks that condition c has exactly the given waiter threads.
125		*/
126	<	public void testUnlock_IllegalMonitorStateException() {
127	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
128	<	try {
129	<	rl.writeLock().unlock();
130	<	shouldThrow();
131	<	} catch(IllegalMonitorStateException success){}
126	>	void assertHasWaiters(PublicReentrantReadWriteLock lock, Condition c,
127	>	Thread... threads) {
128	>	lock.writeLock().lock();
129	>	assertEquals(threads.length > 0, lock.hasWaiters(c));
130	>	assertEquals(threads.length, lock.getWaitQueueLength(c));
131	>	assertEquals(threads.length == 0, lock.getWaitingThreads(c).isEmpty());
132	>	assertEquals(threads.length, lock.getWaitingThreads(c).size());
133	>	assertEquals(new HashSet<Thread>(lock.getWaitingThreads(c)),
134	>	new HashSet<Thread>(Arrays.asList(threads)));
135	>	lock.writeLock().unlock();
136		}
137
138	+	/**
139	+	* Constructor sets given fairness, and is in unlocked state
140	+	*/
141	+	public void testConstructor() {
142	+	PublicReentrantReadWriteLock lock;
143	+
144	+	lock = new PublicReentrantReadWriteLock();
145	+	assertFalse(lock.isFair());
146	+	assertNotWriteLocked(lock);
147	+	assertEquals(0, lock.getReadLockCount());
148	+
149	+	lock = new PublicReentrantReadWriteLock(true);
150	+	assertTrue(lock.isFair());
151	+	assertNotWriteLocked(lock);
152	+	assertEquals(0, lock.getReadLockCount());
153	+
154	+	lock = new PublicReentrantReadWriteLock(false);
155	+	assertFalse(lock.isFair());
156	+	assertNotWriteLocked(lock);
157	+	assertEquals(0, lock.getReadLockCount());
158	+	}
159
160		/**
161	<	* write-lockInterruptibly is interruptible
161	>	* write-locking and read-locking an unlocked lock succeed
162		*/
163	<	public void testWriteLockInterruptibly_Interrupted() {
164	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
165	<	lock.writeLock().lock();
166	<	Thread t = new Thread(new Runnable() {
167	<	public void run() {
168	<	try {
169	<	lock.writeLock().lockInterruptibly();
170	<	threadShouldThrow();
171	<	} catch(InterruptedException success){}
172	<	}
173	<	});
174	<	try {
175	<	t.start();
176	<	t.interrupt();
177	<	lock.writeLock().unlock();
179	<	t.join();
180	<	} catch(Exception e){
181	<	unexpectedException();
182	<	}
183	<	}
163	>	public void testLock() {
164	>	PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
165	>	assertNotWriteLocked(lock);
166	>	lock.writeLock().lock();
167	>	assertWriteLockedBy(lock, Thread.currentThread());
168	>	lock.writeLock().unlock();
169	>	assertNotWriteLocked(lock);
170	>	assertEquals(0, lock.getReadLockCount());
171	>	lock.readLock().lock();
172	>	assertNotWriteLocked(lock);
173	>	assertEquals(1, lock.getReadLockCount());
174	>	lock.readLock().unlock();
175	>	assertNotWriteLocked(lock);
176	>	assertEquals(0, lock.getReadLockCount());
177	>	}
178
179		/**
180	<	* timed write-trylock is interruptible
180	>	* locking an unlocked fair lock succeeds
181		*/
182	<	public void testWriteTryLock_Interrupted() {
183	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
184	<	lock.writeLock().lock();
185	<	Thread t = new Thread(new Runnable() {
186	<	public void run() {
187	<	try {
188	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
189	<	threadShouldThrow();
190	<	} catch(InterruptedException success){}
191	<	}
192	<	});
193	<	try {
194	<	t.start();
195	<	t.interrupt();
202	<	lock.writeLock().unlock();
203	<	t.join();
204	<	} catch(Exception e){
205	<	unexpectedException();
206	<	}
182	>	public void testFairLock() {
183	>	PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(true);
184	>	assertNotWriteLocked(lock);
185	>	lock.writeLock().lock();
186	>	assertWriteLockedBy(lock, Thread.currentThread());
187	>	lock.writeLock().unlock();
188	>	assertNotWriteLocked(lock);
189	>	assertEquals(0, lock.getReadLockCount());
190	>	lock.readLock().lock();
191	>	assertNotWriteLocked(lock);
192	>	assertEquals(1, lock.getReadLockCount());
193	>	lock.readLock().unlock();
194	>	assertNotWriteLocked(lock);
195	>	assertEquals(0, lock.getReadLockCount());
196		}
197
198		/**
199	<	* read-lockInterruptibly is interruptible
199	>	* getWriteHoldCount returns number of recursive holds
200		*/
201	<	public void testReadLockInterruptibly_Interrupted() {
202	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
203	<	lock.writeLock().lock();
204	<	Thread t = new Thread(new Runnable() {
205	<	public void run() {
206	<	try {
207	<	lock.readLock().lockInterruptibly();
219	<	threadShouldThrow();
220	<	} catch(InterruptedException success){}
221	<	}
222	<	});
223	<	try {
224	<	t.start();
225	<	t.interrupt();
201	>	public void testGetWriteHoldCount() {
202	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
203	>	for (int i = 1; i <= SIZE; i++) {
204	>	lock.writeLock().lock();
205	>	assertEquals(i,lock.getWriteHoldCount());
206	>	}
207	>	for (int i = SIZE; i > 0; i--) {
208		lock.writeLock().unlock();
209	<	t.join();
228	<	} catch(Exception e){
229	<	unexpectedException();
209	>	assertEquals(i-1,lock.getWriteHoldCount());
210		}
211	<	}
211	>	}
212
213		/**
214	<	* timed read-trylock is interruptible
214	>	* WriteLock.getHoldCount returns number of recursive holds
215		*/
216	<	public void testReadTryLock_Interrupted() {
217	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
218	<	lock.writeLock().lock();
219	<	Thread t = new Thread(new Runnable() {
220	<	public void run() {
221	<	try {
222	<	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
223	<	threadShouldThrow();
224	<	} catch(InterruptedException success){}
245	<	}
246	<	});
247	<	try {
248	<	t.start();
249	<	t.interrupt();
250	<	t.join();
251	<	} catch(Exception e){
252	<	unexpectedException();
216	>	public void testGetHoldCount() {
217	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
218	>	for (int i = 1; i <= SIZE; i++) {
219	>	lock.writeLock().lock();
220	>	assertEquals(i,lock.writeLock().getHoldCount());
221	>	}
222	>	for (int i = SIZE; i > 0; i--) {
223	>	lock.writeLock().unlock();
224	>	assertEquals(i-1,lock.writeLock().getHoldCount());
225		}
226		}
227
256	–
228		/**
229	<	* write-trylock fails if locked
229	>	* getReadHoldCount returns number of recursive holds
230		*/
231	<	public void testWriteTryLockWhenLocked() {
232	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
233	<	lock.writeLock().lock();
234	<	Thread t = new Thread(new Runnable() {
235	<	public void run() {
236	<	threadAssertFalse(lock.writeLock().tryLock());
237	<	}
238	<	});
239	<	try {
269	<	t.start();
270	<	t.join();
271	<	lock.writeLock().unlock();
272	<	} catch(Exception e){
273	<	unexpectedException();
231	>	public void testGetReadHoldCount() {
232	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
233	>	for (int i = 1; i <= SIZE; i++) {
234	>	lock.readLock().lock();
235	>	assertEquals(i,lock.getReadHoldCount());
236	>	}
237	>	for (int i = SIZE; i > 0; i--) {
238	>	lock.readLock().unlock();
239	>	assertEquals(i-1,lock.getReadHoldCount());
240		}
241	<	}
241	>	}
242
243		/**
244	<	* read-trylock fails if locked
244	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
245		*/
246	<	public void testReadTryLockWhenLocked() {
247	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
282	<	lock.writeLock().lock();
283	<	Thread t = new Thread(new Runnable() {
284	<	public void run() {
285	<	threadAssertFalse(lock.readLock().tryLock());
286	<	}
287	<	});
246	>	public void testWriteUnlock_IllegalMonitorStateException() {
247	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
248		try {
289	–	t.start();
290	–	t.join();
249		lock.writeLock().unlock();
250	<	} catch(Exception e){
251	<	unexpectedException();
252	<	}
295	<	}
250	>	shouldThrow();
251	>	} catch (IllegalMonitorStateException success) {}
252	>	}
253
254		/**
255	<	* Multiple threads can hold a read lock when not write-locked
255	>	* read-unlocking an unlocked lock throws IllegalMonitorStateException
256		*/
257	<	public void testMultipleReadLocks() {
258	<	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	<	});
257	>	public void testReadUnlock_IllegalMonitorStateException() {
258	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
259		try {
310	–	t.start();
311	–	t.join();
260		lock.readLock().unlock();
261	<	} catch(Exception e){
262	<	unexpectedException();
263	<	}
316	<	}
261	>	shouldThrow();
262	>	} catch (IllegalMonitorStateException success) {}
263	>	}
264
265		/**
266	<	* A writelock succeeds after reading threads unlock
266	>	* write-lockInterruptibly is interruptible
267		*/
268	<	public void testWriteAfterMultipleReadLocks() {
269	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
270	<	lock.readLock().lock();
271	<	Thread t1 = new Thread(new Runnable() {
272	<	public void run() {
273	<	lock.readLock().lock();
274	<	lock.readLock().unlock();
328	<	}
329	<	});
330	<	Thread t2 = new Thread(new Runnable() {
331	<	public void run() {
332	<	lock.writeLock().lock();
333	<	lock.writeLock().unlock();
334	<	}
335	<	});
268	>	public void testWriteLockInterruptibly_Interrupted() throws Exception {
269	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
270	>	lock.writeLock().lock();
271	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
272	>	public void realRun() throws InterruptedException {
273	>	lock.writeLock().lockInterruptibly();
274	>	}});
275
276	<	try {
277	<	t1.start();
278	<	t2.start();
279	<	Thread.sleep(SHORT_DELAY_MS);
280	<	lock.readLock().unlock();
342	<	t1.join(MEDIUM_DELAY_MS);
343	<	t2.join(MEDIUM_DELAY_MS);
344	<	assertTrue(!t1.isAlive());
345	<	assertTrue(!t2.isAlive());
346	<
347	<	} catch(Exception e){
348	<	unexpectedException();
349	<	}
350	<	}
276	>	waitForQueuedThread(lock, t);
277	>	t.interrupt();
278	>	awaitTermination(t);
279	>	releaseWriteLock(lock);
280	>	}
281
282		/**
283	<	* Readlocks succeed after a writing thread unlocks
283	>	* timed write-tryLock is interruptible
284		*/
285	<	public void testReadAfterWriteLock() {
286	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
287	<	lock.writeLock().lock();
288	<	Thread t1 = new Thread(new Runnable() {
289	<	public void run() {
290	<	lock.readLock().lock();
291	<	lock.readLock().unlock();
362	<	}
363	<	});
364	<	Thread t2 = new Thread(new Runnable() {
365	<	public void run() {
366	<	lock.readLock().lock();
367	<	lock.readLock().unlock();
368	<	}
369	<	});
370	<
371	<	try {
372	<	t1.start();
373	<	t2.start();
374	<	Thread.sleep(SHORT_DELAY_MS);
375	<	lock.writeLock().unlock();
376	<	t1.join(MEDIUM_DELAY_MS);
377	<	t2.join(MEDIUM_DELAY_MS);
378	<	assertTrue(!t1.isAlive());
379	<	assertTrue(!t2.isAlive());
380	<
381	<	} catch(Exception e){
382	<	unexpectedException();
383	<	}
384	<	}
285	>	public void testWriteTryLock_Interrupted() throws InterruptedException {
286	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
287	>	lock.writeLock().lock();
288	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
289	>	public void realRun() throws InterruptedException {
290	>	lock.writeLock().tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
291	>	}});
292
293	+	waitForQueuedThread(lock, t);
294	+	t.interrupt();
295	+	awaitTermination(t);
296	+	releaseWriteLock(lock);
297	+	}
298
299		/**
300	<	* Read trylock succeeds if readlocked but not writelocked
300	>	* read-lockInterruptibly is interruptible
301		*/
302	<	public void testTryLockWhenReadLocked() {
303	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
304	<	lock.readLock().lock();
305	<	Thread t = new Thread(new Runnable() {
306	<	public void run() {
307	<	threadAssertTrue(lock.readLock().tryLock());
308	<	lock.readLock().unlock();
397	<	}
398	<	});
399	<	try {
400	<	t.start();
401	<	t.join();
402	<	lock.readLock().unlock();
403	<	} catch(Exception e){
404	<	unexpectedException();
405	<	}
406	<	}
302	>	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
303	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
304	>	lock.writeLock().lock();
305	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
306	>	public void realRun() throws InterruptedException {
307	>	lock.readLock().lockInterruptibly();
308	>	}});
309
310	<
310	>	waitForQueuedThread(lock, t);
311	>	t.interrupt();
312	>	awaitTermination(t);
313	>	releaseWriteLock(lock);
314	>	}
315
316		/**
317	<	* write trylock fails when readlocked
317	>	* timed read-tryLock is interruptible
318		*/
319	<	public void testWriteTryLockWhenReadLocked() {
320	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
321	<	lock.readLock().lock();
322	<	Thread t = new Thread(new Runnable() {
323	<	public void run() {
324	<	threadAssertFalse(lock.writeLock().tryLock());
325	<	}
420	<	});
421	<	try {
422	<	t.start();
423	<	t.join();
424	<	lock.readLock().unlock();
425	<	} catch(Exception e){
426	<	unexpectedException();
427	<	}
428	<	}
319	>	public void testReadTryLock_Interrupted() throws InterruptedException {
320	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
321	>	lock.writeLock().lock();
322	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
323	>	public void realRun() throws InterruptedException {
324	>	lock.readLock().tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
325	>	}});
326
327	<
327	>	waitForQueuedThread(lock, t);
328	>	t.interrupt();
329	>	awaitTermination(t);
330	>	releaseWriteLock(lock);
331	>	}
332
333		/**
334	<	* write timed trylock times out if locked
334	>	* write-tryLock fails if locked
335		*/
336	<	public void testWriteTryLock_Timeout() {
337	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
338	<	lock.writeLock().lock();
339	<	Thread t = new Thread(new Runnable() {
340	<	public void run() {
341	<	try {
342	<	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
343	<	} catch (Exception ex) {
344	<	threadUnexpectedException();
345	<	}
346	<	}
446	<	});
447	<	try {
448	<	t.start();
449	<	t.join();
450	<	lock.writeLock().unlock();
451	<	} catch(Exception e){
452	<	unexpectedException();
453	<	}
454	<	}
336	>	public void testWriteTryLockWhenLocked() throws InterruptedException {
337	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
338	>	lock.writeLock().lock();
339	>	Thread t = newStartedThread(new CheckedRunnable() {
340	>	public void realRun() {
341	>	assertFalse(lock.writeLock().tryLock());
342	>	}});
343	>
344	>	awaitTermination(t);
345	>	releaseWriteLock(lock);
346	>	}
347
348		/**
349	<	* read timed trylock times out if write-locked
349	>	* read-tryLock fails if locked
350		*/
351	<	public void testReadTryLock_Timeout() {
352	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
353	<	lock.writeLock().lock();
354	<	Thread t = new Thread(new Runnable() {
355	<	public void run() {
356	<	try {
357	<	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	<	}
351	>	public void testReadTryLockWhenLocked() throws InterruptedException {
352	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
353	>	lock.writeLock().lock();
354	>	Thread t = newStartedThread(new CheckedRunnable() {
355	>	public void realRun() {
356	>	assertFalse(lock.readLock().tryLock());
357	>	}});
358
359	+	awaitTermination(t);
360	+	releaseWriteLock(lock);
361	+	}
362	+
363	+	/**
364	+	* Multiple threads can hold a read lock when not write-locked
365	+	*/
366	+	public void testMultipleReadLocks() throws InterruptedException {
367	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
368	+	lock.readLock().lock();
369	+	Thread t = newStartedThread(new CheckedRunnable() {
370	+	public void realRun() {
371	+	assertTrue(lock.readLock().tryLock());
372	+	lock.readLock().unlock();
373	+	}});
374	+
375	+	awaitTermination(t);
376	+	lock.readLock().unlock();
377	+	}
378	+
379	+	/**
380	+	* A writelock succeeds only after a reading thread unlocks
381	+	*/
382	+	public void testWriteAfterReadLock() throws InterruptedException {
383	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
384	+	lock.readLock().lock();
385	+
386	+	Thread t = newStartedThread(new CheckedRunnable() {
387	+	public void realRun() {
388	+	assertEquals(1, lock.getReadLockCount());
389	+	lock.writeLock().lock();
390	+	assertEquals(0, lock.getReadLockCount());
391	+	lock.writeLock().unlock();
392	+	}});
393	+	waitForQueuedThread(lock, t);
394	+	assertNotWriteLocked(lock);
395	+	assertEquals(1, lock.getReadLockCount());
396	+	lock.readLock().unlock();
397	+	assertEquals(0, lock.getReadLockCount());
398	+	awaitTermination(t);
399	+	assertNotWriteLocked(lock);
400	+	}
401	+
402	+	/**
403	+	* A writelock succeeds only after reading threads unlock
404	+	*/
405	+	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
406	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
407	+	lock.readLock().lock();
408	+	lock.readLock().lock();
409	+	Thread t1 = newStartedThread(new CheckedRunnable() {
410	+	public void realRun() {
411	+	lock.readLock().lock();
412	+	assertEquals(3, lock.getReadLockCount());
413	+	lock.readLock().unlock();
414	+	}});
415	+	awaitTermination(t1);
416	+
417	+	Thread t2 = newStartedThread(new CheckedRunnable() {
418	+	public void realRun() {
419	+	assertEquals(2, lock.getReadLockCount());
420	+	lock.writeLock().lock();
421	+	assertEquals(0, lock.getReadLockCount());
422	+	lock.writeLock().unlock();
423	+	}});
424	+	waitForQueuedThread(lock, t2);
425	+	assertNotWriteLocked(lock);
426	+	assertEquals(2, lock.getReadLockCount());
427	+	lock.readLock().unlock();
428	+	lock.readLock().unlock();
429	+	assertEquals(0, lock.getReadLockCount());
430	+	awaitTermination(t2);
431	+	assertNotWriteLocked(lock);
432	+	}
433	+
434	+	/**
435	+	* A thread that tries to acquire a fair read lock (non-reentrantly)
436	+	* will block if there is a waiting writer thread.
437	+	*/
438	+	public void testReaderWriterReaderFairFifo() throws InterruptedException {
439	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(true);
440	+	final AtomicBoolean t1GotLock = new AtomicBoolean(false);
441	+
442	+	lock.readLock().lock();
443	+	Thread t1 = newStartedThread(new CheckedRunnable() {
444	+	public void realRun() {
445	+	assertEquals(1, lock.getReadLockCount());
446	+	lock.writeLock().lock();
447	+	assertEquals(0, lock.getReadLockCount());
448	+	t1GotLock.set(true);
449	+	lock.writeLock().unlock();
450	+	}});
451	+	waitForQueuedThread(lock, t1);
452	+
453	+	Thread t2 = newStartedThread(new CheckedRunnable() {
454	+	public void realRun() {
455	+	assertEquals(1, lock.getReadLockCount());
456	+	lock.readLock().lock();
457	+	assertEquals(1, lock.getReadLockCount());
458	+	assertTrue(t1GotLock.get());
459	+	lock.readLock().unlock();
460	+	}});
461	+	waitForQueuedThread(lock, t2);
462	+	assertTrue(t1.isAlive());
463	+	assertNotWriteLocked(lock);
464	+	assertEquals(1, lock.getReadLockCount());
465	+	lock.readLock().unlock();
466	+	awaitTermination(t1);
467	+	awaitTermination(t2);
468	+	assertNotWriteLocked(lock);
469	+	}
470	+
471	+	/**
472	+	* Readlocks succeed only after a writing thread unlocks
473	+	*/
474	+	public void testReadAfterWriteLock() throws InterruptedException {
475	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
476	+	lock.writeLock().lock();
477	+	Thread t1 = newStartedThread(new CheckedRunnable() {
478	+	public void realRun() {
479	+	lock.readLock().lock();
480	+	lock.readLock().unlock();
481	+	}});
482	+	Thread t2 = newStartedThread(new CheckedRunnable() {
483	+	public void realRun() {
484	+	lock.readLock().lock();
485	+	lock.readLock().unlock();
486	+	}});
487	+
488	+	waitForQueuedThread(lock, t1);
489	+	waitForQueuedThread(lock, t2);
490	+	releaseWriteLock(lock);
491	+	awaitTermination(t1);
492	+	awaitTermination(t2);
493	+	}
494	+
495	+	/**
496	+	* Read trylock succeeds if write locked by current thread
497	+	*/
498	+	public void testReadHoldingWriteLock() {
499	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
500	+	lock.writeLock().lock();
501	+	assertTrue(lock.readLock().tryLock());
502	+	lock.readLock().unlock();
503	+	lock.writeLock().unlock();
504	+	}
505	+
506	+	/**
507	+	* Read lock succeeds if write locked by current thread even if
508	+	* other threads are waiting for readlock
509	+	*/
510	+	public void testReadHoldingWriteLock2() throws InterruptedException {
511	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
512	+	lock.writeLock().lock();
513	+	lock.readLock().lock();
514	+	lock.readLock().unlock();
515	+
516	+	Thread t1 = newStartedThread(new CheckedRunnable() {
517	+	public void realRun() {
518	+	lock.readLock().lock();
519	+	lock.readLock().unlock();
520	+	}});
521	+	Thread t2 = newStartedThread(new CheckedRunnable() {
522	+	public void realRun() {
523	+	lock.readLock().lock();
524	+	lock.readLock().unlock();
525	+	}});
526	+
527	+	waitForQueuedThread(lock, t1);
528	+	waitForQueuedThread(lock, t2);
529	+	assertWriteLockedBy(lock, Thread.currentThread());
530	+	lock.readLock().lock();
531	+	lock.readLock().unlock();
532	+	releaseWriteLock(lock);
533	+	awaitTermination(t1);
534	+	awaitTermination(t2);
535	+	}
536	+
537	+	/**
538	+	* Read lock succeeds if write locked by current thread even if
539	+	* other threads are waiting for writelock
540	+	*/
541	+	public void testReadHoldingWriteLock3() throws InterruptedException {
542	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
543	+	lock.writeLock().lock();
544	+	lock.readLock().lock();
545	+	lock.readLock().unlock();
546	+
547	+	Thread t1 = newStartedThread(new CheckedRunnable() {
548	+	public void realRun() {
549	+	lock.writeLock().lock();
550	+	lock.writeLock().unlock();
551	+	}});
552	+	Thread t2 = newStartedThread(new CheckedRunnable() {
553	+	public void realRun() {
554	+	lock.writeLock().lock();
555	+	lock.writeLock().unlock();
556	+	}});
557	+
558	+	waitForQueuedThread(lock, t1);
559	+	waitForQueuedThread(lock, t2);
560	+	assertWriteLockedBy(lock, Thread.currentThread());
561	+	lock.readLock().lock();
562	+	lock.readLock().unlock();
563	+	releaseWriteLock(lock);
564	+	awaitTermination(t1);
565	+	awaitTermination(t2);
566	+	}
567	+
568	+	/**
569	+	* Write lock succeeds if write locked by current thread even if
570	+	* other threads are waiting for writelock
571	+	*/
572	+	public void testWriteHoldingWriteLock4() throws InterruptedException {
573	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
574	+	lock.writeLock().lock();
575	+	lock.writeLock().lock();
576	+	lock.writeLock().unlock();
577	+
578	+	Thread t1 = newStartedThread(new CheckedRunnable() {
579	+	public void realRun() {
580	+	lock.writeLock().lock();
581	+	lock.writeLock().unlock();
582	+	}});
583	+	Thread t2 = newStartedThread(new CheckedRunnable() {
584	+	public void realRun() {
585	+	lock.writeLock().lock();
586	+	lock.writeLock().unlock();
587	+	}});
588	+
589	+	waitForQueuedThread(lock, t1);
590	+	waitForQueuedThread(lock, t2);
591	+	assertWriteLockedBy(lock, Thread.currentThread());
592	+	assertEquals(1, lock.getWriteHoldCount());
593	+	lock.writeLock().lock();
594	+	assertWriteLockedBy(lock, Thread.currentThread());
595	+	assertEquals(2, lock.getWriteHoldCount());
596	+	lock.writeLock().unlock();
597	+	releaseWriteLock(lock);
598	+	awaitTermination(t1);
599	+	awaitTermination(t2);
600	+	}
601	+
602	+	/**
603	+	* Fair Read trylock succeeds if write locked by current thread
604	+	*/
605	+	public void testReadHoldingWriteLockFair() {
606	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
607	+	lock.writeLock().lock();
608	+	assertTrue(lock.readLock().tryLock());
609	+	lock.readLock().unlock();
610	+	lock.writeLock().unlock();
611	+	}
612	+
613	+	/**
614	+	* Fair Read lock succeeds if write locked by current thread even if
615	+	* other threads are waiting for readlock
616	+	*/
617	+	public void testReadHoldingWriteLockFair2() throws InterruptedException {
618	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(true);
619	+	lock.writeLock().lock();
620	+	lock.readLock().lock();
621	+	lock.readLock().unlock();
622	+
623	+	Thread t1 = newStartedThread(new CheckedRunnable() {
624	+	public void realRun() {
625	+	lock.readLock().lock();
626	+	lock.readLock().unlock();
627	+	}});
628	+	Thread t2 = newStartedThread(new CheckedRunnable() {
629	+	public void realRun() {
630	+	lock.readLock().lock();
631	+	lock.readLock().unlock();
632	+	}});
633	+
634	+	waitForQueuedThread(lock, t1);
635	+	waitForQueuedThread(lock, t2);
636	+	assertWriteLockedBy(lock, Thread.currentThread());
637	+	lock.readLock().lock();
638	+	lock.readLock().unlock();
639	+	releaseWriteLock(lock);
640	+	awaitTermination(t1);
641	+	awaitTermination(t2);
642	+	}
643	+
644	+	/**
645	+	* Fair Read lock succeeds if write locked by current thread even if
646	+	* other threads are waiting for writelock
647	+	*/
648	+	public void testReadHoldingWriteLockFair3() throws InterruptedException {
649	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(true);
650	+	lock.writeLock().lock();
651	+	lock.readLock().lock();
652	+	lock.readLock().unlock();
653	+
654	+	Thread t1 = newStartedThread(new CheckedRunnable() {
655	+	public void realRun() {
656	+	lock.writeLock().lock();
657	+	lock.writeLock().unlock();
658	+	}});
659	+	Thread t2 = newStartedThread(new CheckedRunnable() {
660	+	public void realRun() {
661	+	lock.writeLock().lock();
662	+	lock.writeLock().unlock();
663	+	}});
664	+
665	+	waitForQueuedThread(lock, t1);
666	+	waitForQueuedThread(lock, t2);
667	+	assertWriteLockedBy(lock, Thread.currentThread());
668	+	lock.readLock().lock();
669	+	lock.readLock().unlock();
670	+	releaseWriteLock(lock);
671	+	awaitTermination(t1);
672	+	awaitTermination(t2);
673	+	}
674	+
675	+	/**
676	+	* Fair Write lock succeeds if write locked by current thread even if
677	+	* other threads are waiting for writelock
678	+	*/
679	+	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
680	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(true);
681	+	lock.writeLock().lock();
682	+	Thread t1 = newStartedThread(new CheckedRunnable() {
683	+	public void realRun() {
684	+	lock.writeLock().lock();
685	+	lock.writeLock().unlock();
686	+	}});
687	+	Thread t2 = newStartedThread(new CheckedRunnable() {
688	+	public void realRun() {
689	+	lock.writeLock().lock();
690	+	lock.writeLock().unlock();
691	+	}});
692	+
693	+	waitForQueuedThread(lock, t1);
694	+	waitForQueuedThread(lock, t2);
695	+	assertWriteLockedBy(lock, Thread.currentThread());
696	+	assertEquals(1, lock.getWriteHoldCount());
697	+	lock.writeLock().lock();
698	+	assertEquals(2, lock.getWriteHoldCount());
699	+	lock.writeLock().unlock();
700	+	lock.writeLock().lock();
701	+	lock.writeLock().unlock();
702	+	releaseWriteLock(lock);
703	+	awaitTermination(t1);
704	+	awaitTermination(t2);
705	+	}
706	+
707	+	/**
708	+	* Read tryLock succeeds if readlocked but not writelocked
709	+	*/
710	+	public void testTryLockWhenReadLocked() throws InterruptedException {
711	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
712	+	lock.readLock().lock();
713	+	Thread t = newStartedThread(new CheckedRunnable() {
714	+	public void realRun() {
715	+	assertTrue(lock.readLock().tryLock());
716	+	lock.readLock().unlock();
717	+	}});
718	+
719	+	awaitTermination(t);
720	+	lock.readLock().unlock();
721	+	}
722	+
723	+	/**
724	+	* write tryLock fails when readlocked
725	+	*/
726	+	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
727	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
728	+	lock.readLock().lock();
729	+	Thread t = newStartedThread(new CheckedRunnable() {
730	+	public void realRun() {
731	+	assertFalse(lock.writeLock().tryLock());
732	+	}});
733	+
734	+	awaitTermination(t);
735	+	lock.readLock().unlock();
736	+	}
737	+
738	+	/**
739	+	* Fair Read tryLock succeeds if readlocked but not writelocked
740	+	*/
741	+	public void testTryLockWhenReadLockedFair() throws InterruptedException {
742	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
743	+	lock.readLock().lock();
744	+	Thread t = newStartedThread(new CheckedRunnable() {
745	+	public void realRun() {
746	+	assertTrue(lock.readLock().tryLock());
747	+	lock.readLock().unlock();
748	+	}});
749	+
750	+	awaitTermination(t);
751	+	lock.readLock().unlock();
752	+	}
753	+
754	+	/**
755	+	* Fair write tryLock fails when readlocked
756	+	*/
757	+	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
758	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
759	+	lock.readLock().lock();
760	+	Thread t = newStartedThread(new CheckedRunnable() {
761	+	public void realRun() {
762	+	assertFalse(lock.writeLock().tryLock());
763	+	}});
764	+
765	+	awaitTermination(t);
766	+	lock.readLock().unlock();
767	+	}
768	+
769	+	/**
770	+	* write timed tryLock times out if locked
771	+	*/
772	+	public void testWriteTryLock_Timeout() throws InterruptedException {
773	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
774	+	lock.writeLock().lock();
775	+	Thread t = newStartedThread(new CheckedRunnable() {
776	+	public void realRun() throws InterruptedException {
777	+	long startTime = System.nanoTime();
778	+	long timeoutMillis = 10;
779	+	assertFalse(lock.writeLock().tryLock(timeoutMillis, MILLISECONDS));
780	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
781	+	}});
782	+
783	+	awaitTermination(t);
784	+	assertTrue(lock.writeLock().isHeldByCurrentThread());
785	+	lock.writeLock().unlock();
786	+	}
787	+
788	+	/**
789	+	* read timed tryLock times out if write-locked
790	+	*/
791	+	public void testReadTryLock_Timeout() throws InterruptedException {
792	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
793	+	lock.writeLock().lock();
794	+	Thread t = newStartedThread(new CheckedRunnable() {
795	+	public void realRun() throws InterruptedException {
796	+	long startTime = System.nanoTime();
797	+	long timeoutMillis = 10;
798	+	assertFalse(lock.readLock().tryLock(timeoutMillis, MILLISECONDS));
799	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
800	+	}});
801	+
802	+	awaitTermination(t);
803	+	assertTrue(lock.writeLock().isHeldByCurrentThread());
804	+	lock.writeLock().unlock();
805	+	}
806
807		/**
808		* write lockInterruptibly succeeds if lock free else is interruptible
809		*/
810	<	public void testWriteLockInterruptibly() {
811	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
812	<	try {
813	<	lock.writeLock().lockInterruptibly();
814	<	} catch(Exception e) {
815	<	unexpectedException();
816	<	}
817	<	Thread t = new Thread(new Runnable() {
818	<	public void run() {
819	<	try {
820	<	lock.writeLock().lockInterruptibly();
821	<	threadShouldThrow();
496	<	}
497	<	catch(InterruptedException success) {
498	<	}
499	<	}
500	<	});
501	<	try {
502	<	t.start();
503	<	t.interrupt();
504	<	t.join();
505	<	lock.writeLock().unlock();
506	<	} catch(Exception e){
507	<	unexpectedException();
508	<	}
810	>	public void testWriteLockInterruptibly() throws InterruptedException {
811	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
812	>	lock.writeLock().lockInterruptibly();
813	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
814	>	public void realRun() throws InterruptedException {
815	>	lock.writeLock().lockInterruptibly();
816	>	}});
817	>
818	>	waitForQueuedThread(lock, t);
819	>	t.interrupt();
820	>	awaitTermination(t);
821	>	releaseWriteLock(lock);
822		}
823
824		/**
825	<	*  read lockInterruptibly succeeds if lock free else is interruptible
825	>	* read lockInterruptibly succeeds if lock free else is interruptible
826		*/
827	<	public void testReadLockInterruptibly() {
828	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
829	<	try {
830	<	lock.writeLock().lockInterruptibly();
831	<	} catch(Exception e) {
832	<	unexpectedException();
833	<	}
834	<	Thread t = new Thread(new Runnable() {
835	<	public void run() {
836	<	try {
837	<	lock.readLock().lockInterruptibly();
838	<	threadShouldThrow();
526	<	}
527	<	catch(InterruptedException success) {
528	<	}
529	<	}
530	<	});
531	<	try {
532	<	t.start();
533	<	t.interrupt();
534	<	t.join();
535	<	lock.writeLock().unlock();
536	<	} catch(Exception e){
537	<	unexpectedException();
538	<	}
827	>	public void testReadLockInterruptibly() throws InterruptedException {
828	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
829	>	lock.writeLock().lockInterruptibly();
830	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
831	>	public void realRun() throws InterruptedException {
832	>	lock.readLock().lockInterruptibly();
833	>	}});
834	>
835	>	waitForQueuedThread(lock, t);
836	>	t.interrupt();
837	>	awaitTermination(t);
838	>	releaseWriteLock(lock);
839		}
840
841		/**
842		* Calling await without holding lock throws IllegalMonitorStateException
843		*/
844	<	public void testAwait_IllegalMonitor() {
845	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
844	>	public void testAwait_IllegalMonitor() throws InterruptedException {
845	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
846		final Condition c = lock.writeLock().newCondition();
847		try {
848		c.await();
849		shouldThrow();
850	<	}
851	<	catch (IllegalMonitorStateException success) {
852	<	}
553	<	catch (Exception ex) {
850	>	} catch (IllegalMonitorStateException success) {}
851	>	try {
852	>	c.await(LONG_DELAY_MS, MILLISECONDS);
853		shouldThrow();
854	<	}
854	>	} catch (IllegalMonitorStateException success) {}
855	>	try {
856	>	c.awaitNanos(100);
857	>	shouldThrow();
858	>	} catch (IllegalMonitorStateException success) {}
859	>	try {
860	>	c.awaitUninterruptibly();
861	>	shouldThrow();
862	>	} catch (IllegalMonitorStateException success) {}
863		}
864
865		/**
866		* Calling signal without holding lock throws IllegalMonitorStateException
867		*/
868		public void testSignal_IllegalMonitor() {
869	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
869	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
870		final Condition c = lock.writeLock().newCondition();
871		try {
872		c.signal();
873		shouldThrow();
874	<	}
568	<	catch (IllegalMonitorStateException success) {
569	<	}
570	<	catch (Exception ex) {
571	<	unexpectedException();
572	<	}
874	>	} catch (IllegalMonitorStateException success) {}
875		}
876
877		/**
878	<	* awaitNanos without a signal times out
878	>	* Calling signalAll without holding lock throws IllegalMonitorStateException
879		*/
880	<	public void testAwaitNanos_Timeout() {
881	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
880	>	public void testSignalAll_IllegalMonitor() {
881	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
882		final Condition c = lock.writeLock().newCondition();
883		try {
884	<	lock.writeLock().lock();
885	<	long t = c.awaitNanos(100);
886	<	assertTrue(t <= 0);
585	<	lock.writeLock().unlock();
586	<	}
587	<	catch (Exception ex) {
588	<	unexpectedException();
589	<	}
884	>	c.signalAll();
885	>	shouldThrow();
886	>	} catch (IllegalMonitorStateException success) {}
887		}
888
889	+	/**
890	+	* awaitNanos without a signal times out
891	+	*/
892	+	public void testAwaitNanos_Timeout() throws InterruptedException {
893	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
894	+	final Condition c = lock.writeLock().newCondition();
895	+	lock.writeLock().lock();
896	+	long startTime = System.nanoTime();
897	+	long timeoutMillis = 10;
898	+	long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis);
899	+	long nanosRemaining = c.awaitNanos(timeoutNanos);
900	+	assertTrue(nanosRemaining <= 0);
901	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
902	+	lock.writeLock().unlock();
903	+	}
904
905		/**
906	<	*  timed await without a signal times out
906	>	* timed await without a signal times out
907		*/
908	<	public void testAwait_Timeout() {
909	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
908	>	public void testAwait_Timeout() throws InterruptedException {
909	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
910		final Condition c = lock.writeLock().newCondition();
911	<	try {
912	<	lock.writeLock().lock();
913	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
914	<	lock.writeLock().unlock();
915	<	}
916	<	catch (Exception ex) {
605	<	unexpectedException();
606	<	}
911	>	lock.writeLock().lock();
912	>	long startTime = System.nanoTime();
913	>	long timeoutMillis = 10;
914	>	assertFalse(c.await(timeoutMillis, MILLISECONDS));
915	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
916	>	lock.writeLock().unlock();
917		}
918
919		/**
920		* awaitUntil without a signal times out
921		*/
922	<	public void testAwaitUntil_Timeout() {
923	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
922	>	public void testAwaitUntil_Timeout() throws InterruptedException {
923	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
924		final Condition c = lock.writeLock().newCondition();
925	<	try {
926	<	lock.writeLock().lock();
927	<	java.util.Date d = new java.util.Date();
928	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
929	<	lock.writeLock().unlock();
930	<	}
931	<	catch (Exception ex) {
622	<	unexpectedException();
623	<	}
925	>	lock.writeLock().lock();
926	>	long startTime = System.nanoTime();
927	>	long timeoutMillis = 10;
928	>	java.util.Date d = new java.util.Date();
929	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + timeoutMillis)));
930	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
931	>	lock.writeLock().unlock();
932		}
933
934		/**
935		* await returns when signalled
936		*/
937	<	public void testAwait() {
938	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
937	>	public void testAwait() throws InterruptedException {
938	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
939		final Condition c = lock.writeLock().newCondition();
940	<	Thread t = new Thread(new Runnable() {
941	<	public void run() {
942	<	try {
943	<	lock.writeLock().lock();
944	<	c.await();
945	<	lock.writeLock().unlock();
946	<	}
947	<	catch(InterruptedException e) {
948	<	threadUnexpectedException();
949	<	}
950	<	}
951	<	});
952	<
953	<	try {
954	<	t.start();
955	<	Thread.sleep(SHORT_DELAY_MS);
956	<	lock.writeLock().lock();
649	<	c.signal();
650	<	lock.writeLock().unlock();
651	<	t.join(SHORT_DELAY_MS);
652	<	assertFalse(t.isAlive());
653	<	}
654	<	catch (Exception ex) {
655	<	unexpectedException();
656	<	}
940	>	final CountDownLatch locked = new CountDownLatch(1);
941	>	Thread t = newStartedThread(new CheckedRunnable() {
942	>	public void realRun() throws InterruptedException {
943	>	lock.writeLock().lock();
944	>	locked.countDown();
945	>	c.await();
946	>	lock.writeLock().unlock();
947	>	}});
948	>
949	>	locked.await();
950	>	lock.writeLock().lock();
951	>	assertHasWaiters(lock, c, t);
952	>	c.signal();
953	>	assertHasNoWaiters(lock, c);
954	>	assertTrue(t.isAlive());
955	>	lock.writeLock().unlock();
956	>	awaitTermination(t);
957		}
958
959		/**
960		* awaitUninterruptibly doesn't abort on interrupt
961		*/
962	<	public void testAwaitUninterruptibly() {
963	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
962	>	public void testAwaitUninterruptibly() throws InterruptedException {
963	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
964		final Condition c = lock.writeLock().newCondition();
965	<	Thread t = new Thread(new Runnable() {
966	<	public void run() {
967	<	lock.writeLock().lock();
968	<	c.awaitUninterruptibly();
969	<	lock.writeLock().unlock();
970	<	}
971	<	});
972	<
973	<	try {
974	<	t.start();
975	<	Thread.sleep(SHORT_DELAY_MS);
976	<	t.interrupt();
977	<	lock.writeLock().lock();
978	<	c.signal();
979	<	lock.writeLock().unlock();
980	<	assert(t.isInterrupted());
981	<	t.join(SHORT_DELAY_MS);
982	<	assertFalse(t.isAlive());
983	<	}
984	<	catch (Exception ex) {
685	<	unexpectedException();
686	<	}
965	>	final CountDownLatch locked = new CountDownLatch(1);
966	>	Thread t = newStartedThread(new CheckedRunnable() {
967	>	public void realRun() {
968	>	lock.writeLock().lock();
969	>	locked.countDown();
970	>	c.awaitUninterruptibly();
971	>	assertTrue(Thread.interrupted());
972	>	lock.writeLock().unlock();
973	>	}});
974	>
975	>	locked.await();
976	>	lock.writeLock().lock();
977	>	lock.writeLock().unlock();
978	>	t.interrupt();
979	>	long timeoutMillis = 10;
980	>	assertThreadJoinTimesOut(t, timeoutMillis);
981	>	lock.writeLock().lock();
982	>	c.signal();
983	>	lock.writeLock().unlock();
984	>	awaitTermination(t);
985		}
986
987		/**
988		* await is interruptible
989		*/
990	<	public void testAwait_Interrupt() {
991	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
990	>	public void testAwait_Interrupt() throws InterruptedException {
991	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
992		final Condition c = lock.writeLock().newCondition();
993	<	Thread t = new Thread(new Runnable() {
994	<	public void run() {
995	<	try {
996	<	lock.writeLock().lock();
997	<	c.await();
998	<	lock.writeLock().unlock();
999	<	threadShouldThrow();
1000	<	}
1001	<	catch(InterruptedException success) {
1002	<	}
1003	<	}
1004	<	});
1005	<
1006	<	try {
1007	<	t.start();
1008	<	Thread.sleep(SHORT_DELAY_MS);
1009	<	t.interrupt();
1010	<	t.join(SHORT_DELAY_MS);
1011	<	assertFalse(t.isAlive());
1012	<	}
1013	<	catch (Exception ex) {
1014	<	unexpectedException();
717	<	}
993	>	final CountDownLatch locked = new CountDownLatch(1);
994	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
995	>	public void realRun() throws InterruptedException {
996	>	lock.writeLock().lock();
997	>	assertWriteLockedBy(lock, Thread.currentThread());
998	>	assertHasNoWaiters(lock, c);
999	>	locked.countDown();
1000	>	try {
1001	>	c.await();
1002	>	} finally {
1003	>	assertWriteLockedBy(lock, Thread.currentThread());
1004	>	assertHasNoWaiters(lock, c);
1005	>	lock.writeLock().unlock();
1006	>	assertFalse(Thread.interrupted());
1007	>	}
1008	>	}});
1009	>
1010	>	locked.await();
1011	>	assertHasWaiters(lock, c, t);
1012	>	t.interrupt();
1013	>	awaitTermination(t);
1014	>	assertNotWriteLocked(lock);
1015		}
1016
1017		/**
1018		* awaitNanos is interruptible
1019		*/
1020	<	public void testAwaitNanos_Interrupt() {
1021	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1020	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
1021	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1022		final Condition c = lock.writeLock().newCondition();
1023	<	Thread t = new Thread(new Runnable() {
1024	<	public void run() {
1025	<	try {
1026	<	lock.writeLock().lock();
1027	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
1028	<	lock.writeLock().unlock();
1029	<	threadShouldThrow();
1030	<	}
1031	<	catch(InterruptedException success) {
1032	<	}
1033	<	}
1034	<	});
1035	<
1036	<	try {
1037	<	t.start();
1038	<	Thread.sleep(SHORT_DELAY_MS);
1039	<	t.interrupt();
1040	<	t.join(SHORT_DELAY_MS);
1041	<	assertFalse(t.isAlive());
1042	<	}
1043	<	catch (Exception ex) {
1044	<	unexpectedException();
748	<	}
1023	>	final CountDownLatch locked = new CountDownLatch(1);
1024	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1025	>	public void realRun() throws InterruptedException {
1026	>	lock.writeLock().lock();
1027	>	assertWriteLockedBy(lock, Thread.currentThread());
1028	>	assertHasNoWaiters(lock, c);
1029	>	locked.countDown();
1030	>	try {
1031	>	c.awaitNanos(MILLISECONDS.toNanos(2 * LONG_DELAY_MS));
1032	>	} finally {
1033	>	assertWriteLockedBy(lock, Thread.currentThread());
1034	>	assertHasNoWaiters(lock, c);
1035	>	lock.writeLock().unlock();
1036	>	assertFalse(Thread.interrupted());
1037	>	}
1038	>	}});
1039	>
1040	>	locked.await();
1041	>	assertHasWaiters(lock, c, t);
1042	>	t.interrupt();
1043	>	awaitTermination(t);
1044	>	assertNotWriteLocked(lock);
1045		}
1046
1047		/**
1048		* awaitUntil is interruptible
1049		*/
1050	<	public void testAwaitUntil_Interrupt() {
1051	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1050	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
1051	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1052		final Condition c = lock.writeLock().newCondition();
1053	<	Thread t = new Thread(new Runnable() {
1054	<	public void run() {
1055	<	try {
1056	<	lock.writeLock().lock();
1057	<	java.util.Date d = new java.util.Date();
1058	<	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
1059	<	lock.writeLock().unlock();
1060	<	threadShouldThrow();
1061	<	}
1062	<	catch(InterruptedException success) {
1063	<	}
1064	<	}
1065	<	});
1066	<
1067	<	try {
1068	<	t.start();
1069	<	Thread.sleep(SHORT_DELAY_MS);
1070	<	t.interrupt();
1071	<	t.join(SHORT_DELAY_MS);
1072	<	assertFalse(t.isAlive());
1073	<	}
1074	<	catch (Exception ex) {
1075	<	unexpectedException();
780	<	}
1053	>	final CountDownLatch locked = new CountDownLatch(1);
1054	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1055	>	public void realRun() throws InterruptedException {
1056	>	lock.writeLock().lock();
1057	>	assertWriteLockedBy(lock, Thread.currentThread());
1058	>	assertHasNoWaiters(lock, c);
1059	>	locked.countDown();
1060	>	java.util.Date d = new java.util.Date();
1061	>	try {
1062	>	c.awaitUntil(new java.util.Date(d.getTime() + 2 * LONG_DELAY_MS));
1063	>	} finally {
1064	>	assertWriteLockedBy(lock, Thread.currentThread());
1065	>	assertHasNoWaiters(lock, c);
1066	>	lock.writeLock().unlock();
1067	>	assertFalse(Thread.interrupted());
1068	>	}
1069	>	}});
1070	>
1071	>	locked.await();
1072	>	assertHasWaiters(lock, c, t);
1073	>	t.interrupt();
1074	>	awaitTermination(t);
1075	>	assertNotWriteLocked(lock);
1076		}
1077
1078		/**
1079		* signalAll wakes up all threads
1080		*/
1081	<	public void testSignalAll() {
1082	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1081	>	public void testSignalAll() throws InterruptedException {
1082	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1083		final Condition c = lock.writeLock().newCondition();
1084	<	Thread t1 = new Thread(new Runnable() {
1085	<	public void run() {
1086	<	try {
1087	<	lock.writeLock().lock();
1088	<	c.await();
1089	<	lock.writeLock().unlock();
1090	<	}
1091	<	catch(InterruptedException e) {
1092	<	threadUnexpectedException();
1093	<	}
1094	<	}
1095	<	});
1096	<
1097	<	Thread t2 = new Thread(new Runnable() {
1098	<	public void run() {
1099	<	try {
1100	<	lock.writeLock().lock();
1101	<	c.await();
1102	<	lock.writeLock().unlock();
1103	<	}
1104	<	catch(InterruptedException e) {
1105	<	threadUnexpectedException();
1106	<	}
1107	<	}
1108	<	});
1084	>	final CountDownLatch locked = new CountDownLatch(2);
1085	>	final Lock writeLock = lock.writeLock();
1086	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1087	>	public void realRun() throws InterruptedException {
1088	>	writeLock.lock();
1089	>	locked.countDown();
1090	>	c.await();
1091	>	writeLock.unlock();
1092	>	}});
1093	>
1094	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1095	>	public void realRun() throws InterruptedException {
1096	>	writeLock.lock();
1097	>	locked.countDown();
1098	>	c.await();
1099	>	writeLock.unlock();
1100	>	}});
1101	>
1102	>	locked.await();
1103	>	writeLock.lock();
1104	>	assertHasWaiters(lock, c, t1, t2);
1105	>	c.signalAll();
1106	>	assertHasNoWaiters(lock, c);
1107	>	writeLock.unlock();
1108	>	awaitTermination(t1);
1109	>	awaitTermination(t2);
1110	>	}
1111
1112	<	try {
1113	<	t1.start();
1114	<	t2.start();
1115	<	Thread.sleep(SHORT_DELAY_MS);
1116	<	lock.writeLock().lock();
1117	<	c.signalAll();
1118	<	lock.writeLock().unlock();
1119	<	t1.join(SHORT_DELAY_MS);
1120	<	t2.join(SHORT_DELAY_MS);
1121	<	assertFalse(t1.isAlive());
1122	<	assertFalse(t2.isAlive());
1123	<	}
1124	<	catch (Exception ex) {
1125	<	unexpectedException();
1126	<	}
1112	>	/**
1113	>	* signal wakes up waiting threads in FIFO order.
1114	>	*/
1115	>	public void testSignalWakesFifo() throws InterruptedException {
1116	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1117	>	final Condition c = lock.writeLock().newCondition();
1118	>	final CountDownLatch locked1 = new CountDownLatch(1);
1119	>	final CountDownLatch locked2 = new CountDownLatch(1);
1120	>	final Lock writeLock = lock.writeLock();
1121	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1122	>	public void realRun() throws InterruptedException {
1123	>	writeLock.lock();
1124	>	locked1.countDown();
1125	>	c.await();
1126	>	writeLock.unlock();
1127	>	}});
1128	>
1129	>	locked1.await();
1130	>
1131	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1132	>	public void realRun() throws InterruptedException {
1133	>	writeLock.lock();
1134	>	locked2.countDown();
1135	>	c.await();
1136	>	writeLock.unlock();
1137	>	}});
1138	>
1139	>	locked2.await();
1140	>
1141	>	writeLock.lock();
1142	>	assertHasWaiters(lock, c, t1, t2);
1143	>	assertFalse(lock.hasQueuedThreads());
1144	>	c.signal();
1145	>	assertHasWaiters(lock, c, t2);
1146	>	assertTrue(lock.hasQueuedThread(t1));
1147	>	assertFalse(lock.hasQueuedThread(t2));
1148	>	c.signal();
1149	>	assertHasNoWaiters(lock, c);
1150	>	assertTrue(lock.hasQueuedThread(t1));
1151	>	assertTrue(lock.hasQueuedThread(t2));
1152	>	writeLock.unlock();
1153	>	awaitTermination(t1);
1154	>	awaitTermination(t2);
1155	>	}
1156	>
1157	>	/**
1158	>	* await after multiple reentrant locking preserves lock count
1159	>	*/
1160	>	public void testAwaitLockCount() throws InterruptedException {
1161	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1162	>	final Condition c = lock.writeLock().newCondition();
1163	>	final CountDownLatch locked = new CountDownLatch(2);
1164	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1165	>	public void realRun() throws InterruptedException {
1166	>	lock.writeLock().lock();
1167	>	assertWriteLockedBy(lock, Thread.currentThread());
1168	>	assertEquals(1, lock.writeLock().getHoldCount());
1169	>	locked.countDown();
1170	>	c.await();
1171	>	assertWriteLockedBy(lock, Thread.currentThread());
1172	>	assertEquals(1, lock.writeLock().getHoldCount());
1173	>	lock.writeLock().unlock();
1174	>	}});
1175	>
1176	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1177	>	public void realRun() throws InterruptedException {
1178	>	lock.writeLock().lock();
1179	>	lock.writeLock().lock();
1180	>	assertWriteLockedBy(lock, Thread.currentThread());
1181	>	assertEquals(2, lock.writeLock().getHoldCount());
1182	>	locked.countDown();
1183	>	c.await();
1184	>	assertWriteLockedBy(lock, Thread.currentThread());
1185	>	assertEquals(2, lock.writeLock().getHoldCount());
1186	>	lock.writeLock().unlock();
1187	>	lock.writeLock().unlock();
1188	>	}});
1189	>
1190	>	locked.await();
1191	>	lock.writeLock().lock();
1192	>	assertHasWaiters(lock, c, t1, t2);
1193	>	c.signalAll();
1194	>	assertHasNoWaiters(lock, c);
1195	>	lock.writeLock().unlock();
1196	>	awaitTermination(t1);
1197	>	awaitTermination(t2);
1198		}
1199
1200		/**
1201		* A serialized lock deserializes as unlocked
1202		*/
1203	<	public void testSerialization() {
1203	>	public void testSerialization() throws Exception {
1204		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
1205		l.readLock().lock();
1206		l.readLock().unlock();
1207
1208	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1209	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1210	+	out.writeObject(l);
1211	+	out.close();
1212	+
1213	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1214	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1215	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1216	+	r.readLock().lock();
1217	+	r.readLock().unlock();
1218	+	}
1219	+
1220	+	/**
1221	+	* hasQueuedThreads reports whether there are waiting threads
1222	+	*/
1223	+	public void testHasQueuedThreads() throws InterruptedException {
1224	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1225	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1226	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1227	+	assertFalse(lock.hasQueuedThreads());
1228	+	lock.writeLock().lock();
1229	+	assertFalse(lock.hasQueuedThreads());
1230	+	t1.start();
1231	+	waitForQueuedThread(lock, t1);
1232	+	assertTrue(lock.hasQueuedThreads());
1233	+	t2.start();
1234	+	waitForQueuedThread(lock, t2);
1235	+	assertTrue(lock.hasQueuedThreads());
1236	+	t1.interrupt();
1237	+	awaitTermination(t1);
1238	+	assertTrue(lock.hasQueuedThreads());
1239	+	lock.writeLock().unlock();
1240	+	awaitTermination(t2);
1241	+	assertFalse(lock.hasQueuedThreads());
1242	+	}
1243	+
1244	+	/**
1245	+	* hasQueuedThread(null) throws NPE
1246	+	*/
1247	+	public void testHasQueuedThreadNPE() {
1248	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1249		try {
1250	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1251	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1252	<	out.writeObject(l);
1253	<	out.close();
1254	<
1255	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1256	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1257	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1258	<	r.readLock().lock();
1259	<	r.readLock().unlock();
1260	<	} catch(Exception e){
1261	<	e.printStackTrace();
1262	<	unexpectedException();
1263	<	}
1250	>	lock.hasQueuedThread(null);
1251	>	shouldThrow();
1252	>	} catch (NullPointerException success) {}
1253	>	}
1254	>
1255	>	/**
1256	>	* hasQueuedThread reports whether a thread is queued.
1257	>	*/
1258	>	public void testHasQueuedThread() throws InterruptedException {
1259	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1260	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1261	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1262	>	assertFalse(lock.hasQueuedThread(t1));
1263	>	assertFalse(lock.hasQueuedThread(t2));
1264	>	lock.writeLock().lock();
1265	>	t1.start();
1266	>	waitForQueuedThread(lock, t1);
1267	>	assertTrue(lock.hasQueuedThread(t1));
1268	>	assertFalse(lock.hasQueuedThread(t2));
1269	>	t2.start();
1270	>	waitForQueuedThread(lock, t2);
1271	>	assertTrue(lock.hasQueuedThread(t1));
1272	>	assertTrue(lock.hasQueuedThread(t2));
1273	>	t1.interrupt();
1274	>	awaitTermination(t1);
1275	>	assertFalse(lock.hasQueuedThread(t1));
1276	>	assertTrue(lock.hasQueuedThread(t2));
1277	>	lock.writeLock().unlock();
1278	>	awaitTermination(t2);
1279	>	assertFalse(lock.hasQueuedThread(t1));
1280	>	assertFalse(lock.hasQueuedThread(t2));
1281		}
1282
1283		/**
1284		* getQueueLength reports number of waiting threads
1285		*/
1286	<	public void testGetQueueLength() {
1287	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1286	>	public void testGetQueueLength() throws InterruptedException {
1287	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1288		Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1289		Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1290	<	try {
1291	<	assertEquals(0, lock.getQueueLength());
1292	<	lock.writeLock().lock();
1293	<	t1.start();
1294	<	Thread.sleep(SHORT_DELAY_MS);
1295	<	assertEquals(1, lock.getQueueLength());
1296	<	t2.start();
1297	<	Thread.sleep(SHORT_DELAY_MS);
1298	<	assertEquals(2, lock.getQueueLength());
1299	<	t1.interrupt();
1300	<	Thread.sleep(SHORT_DELAY_MS);
1301	<	assertEquals(1, lock.getQueueLength());
1302	<	lock.writeLock().unlock();
1303	<	Thread.sleep(SHORT_DELAY_MS);
1304	<	assertEquals(0, lock.getQueueLength());
879	<	t1.join();
880	<	t2.join();
881	<	} catch(Exception e){
882	<	unexpectedException();
883	<	}
884	<	}
1290	>	assertEquals(0, lock.getQueueLength());
1291	>	lock.writeLock().lock();
1292	>	t1.start();
1293	>	waitForQueuedThread(lock, t1);
1294	>	assertEquals(1, lock.getQueueLength());
1295	>	t2.start();
1296	>	waitForQueuedThread(lock, t2);
1297	>	assertEquals(2, lock.getQueueLength());
1298	>	t1.interrupt();
1299	>	awaitTermination(t1);
1300	>	assertEquals(1, lock.getQueueLength());
1301	>	lock.writeLock().unlock();
1302	>	awaitTermination(t2);
1303	>	assertEquals(0, lock.getQueueLength());
1304	>	}
1305
1306		/**
1307		* getQueuedThreads includes waiting threads
1308		*/
1309	<	public void testGetQueuedThreads() {
1310	<	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1309	>	public void testGetQueuedThreads() throws InterruptedException {
1310	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1311		Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1312		Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1313	+	assertTrue(lock.getQueuedThreads().isEmpty());
1314	+	lock.writeLock().lock();
1315	+	assertTrue(lock.getQueuedThreads().isEmpty());
1316	+	t1.start();
1317	+	waitForQueuedThread(lock, t1);
1318	+	assertEquals(1, lock.getQueuedThreads().size());
1319	+	assertTrue(lock.getQueuedThreads().contains(t1));
1320	+	t2.start();
1321	+	waitForQueuedThread(lock, t2);
1322	+	assertEquals(2, lock.getQueuedThreads().size());
1323	+	assertTrue(lock.getQueuedThreads().contains(t1));
1324	+	assertTrue(lock.getQueuedThreads().contains(t2));
1325	+	t1.interrupt();
1326	+	awaitTermination(t1);
1327	+	assertFalse(lock.getQueuedThreads().contains(t1));
1328	+	assertTrue(lock.getQueuedThreads().contains(t2));
1329	+	assertEquals(1, lock.getQueuedThreads().size());
1330	+	lock.writeLock().unlock();
1331	+	awaitTermination(t2);
1332	+	assertTrue(lock.getQueuedThreads().isEmpty());
1333	+	}
1334	+
1335	+	/**
1336	+	* hasWaiters throws NPE if null
1337	+	*/
1338	+	public void testHasWaitersNPE() {
1339	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1340		try {
1341	<	assertTrue(lock.getQueuedThreads().isEmpty());
1342	<	lock.writeLock().lock();
1343	<	assertTrue(lock.getQueuedThreads().isEmpty());
1344	<	t1.start();
898	<	Thread.sleep(SHORT_DELAY_MS);
899	<	assertTrue(lock.getQueuedThreads().contains(t1));
900	<	t2.start();
901	<	Thread.sleep(SHORT_DELAY_MS);
902	<	assertTrue(lock.getQueuedThreads().contains(t1));
903	<	assertTrue(lock.getQueuedThreads().contains(t2));
904	<	t1.interrupt();
905	<	Thread.sleep(SHORT_DELAY_MS);
906	<	assertFalse(lock.getQueuedThreads().contains(t1));
907	<	assertTrue(lock.getQueuedThreads().contains(t2));
908	<	lock.writeLock().unlock();
909	<	Thread.sleep(SHORT_DELAY_MS);
910	<	assertTrue(lock.getQueuedThreads().isEmpty());
911	<	t1.join();
912	<	t2.join();
913	<	} catch(Exception e){
914	<	unexpectedException();
915	<	}
916	<	}
1341	>	lock.hasWaiters(null);
1342	>	shouldThrow();
1343	>	} catch (NullPointerException success) {}
1344	>	}
1345
1346		/**
1347	<	* hasWaiters returns true when a thread is waiting, else false
1347	>	* getWaitQueueLength throws NPE if null
1348		*/
1349	<	public void testHasWaiters() {
1350	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1351	<	final ReentrantReadWriteLock.WriterConditionObject c = (ReentrantReadWriteLock.WriterConditionObject)(lock.writeLock().newCondition());
1352	<	Thread t = new Thread(new Runnable() {
1353	<	public void run() {
1354	<	try {
1355	<	lock.writeLock().lock();
928	<	threadAssertFalse(c.hasWaiters());
929	<	threadAssertEquals(0, c.getWaitQueueLength());
930	<	c.await();
931	<	lock.writeLock().unlock();
932	<	}
933	<	catch(InterruptedException e) {
934	<	threadUnexpectedException();
935	<	}
936	<	}
937	<	});
1349	>	public void testGetWaitQueueLengthNPE() {
1350	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1351	>	try {
1352	>	lock.getWaitQueueLength(null);
1353	>	shouldThrow();
1354	>	} catch (NullPointerException success) {}
1355	>	}
1356
1357	+	/**
1358	+	* getWaitingThreads throws NPE if null
1359	+	*/
1360	+	public void testGetWaitingThreadsNPE() {
1361	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1362		try {
1363	<	t.start();
1364	<	Thread.sleep(SHORT_DELAY_MS);
1365	<	lock.writeLock().lock();
943	<	assertTrue(c.hasWaiters());
944	<	assertEquals(1, c.getWaitQueueLength());
945	<	c.signal();
946	<	lock.writeLock().unlock();
947	<	Thread.sleep(SHORT_DELAY_MS);
948	<	lock.writeLock().lock();
949	<	assertFalse(c.hasWaiters());
950	<	assertEquals(0, c.getWaitQueueLength());
951	<	lock.writeLock().unlock();
952	<	t.join(SHORT_DELAY_MS);
953	<	assertFalse(t.isAlive());
954	<	}
955	<	catch (Exception ex) {
956	<	unexpectedException();
957	<	}
1363	>	lock.getWaitingThreads(null);
1364	>	shouldThrow();
1365	>	} catch (NullPointerException success) {}
1366		}
1367
1368		/**
1369	<	* getWaitQueueLength returns number of waiting threads
1369	>	* hasWaiters throws IllegalArgumentException if not owned
1370		*/
1371	<	public void testGetWaitQueueLength() {
1372	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1373	<	final ReentrantReadWriteLock.WriterConditionObject c = (ReentrantReadWriteLock.WriterConditionObject)(lock.writeLock().newCondition());
1374	<	Thread t1 = new Thread(new Runnable() {
1375	<	public void run() {
1376	<	try {
1377	<	lock.writeLock().lock();
1378	<	threadAssertFalse(c.hasWaiters());
1379	<	threadAssertEquals(0, c.getWaitQueueLength());
972	<	c.await();
973	<	lock.writeLock().unlock();
974	<	}
975	<	catch(InterruptedException e) {
976	<	threadUnexpectedException();
977	<	}
978	<	}
979	<	});
980	<
981	<	Thread t2 = new Thread(new Runnable() {
982	<	public void run() {
983	<	try {
984	<	lock.writeLock().lock();
985	<	threadAssertTrue(c.hasWaiters());
986	<	threadAssertEquals(1, c.getWaitQueueLength());
987	<	c.await();
988	<	lock.writeLock().unlock();
989	<	}
990	<	catch(InterruptedException e) {
991	<	threadUnexpectedException();
992	<	}
993	<	}
994	<	});
1371	>	public void testHasWaitersIAE() {
1372	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1373	>	final Condition c = lock.writeLock().newCondition();
1374	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1375	>	try {
1376	>	lock2.hasWaiters(c);
1377	>	shouldThrow();
1378	>	} catch (IllegalArgumentException success) {}
1379	>	}
1380
1381	+	/**
1382	+	* hasWaiters throws IllegalMonitorStateException if not locked
1383	+	*/
1384	+	public void testHasWaitersIMSE() {
1385	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1386	+	final Condition c = lock.writeLock().newCondition();
1387		try {
1388	<	t1.start();
1389	<	Thread.sleep(SHORT_DELAY_MS);
1390	<	t2.start();
1000	<	Thread.sleep(SHORT_DELAY_MS);
1001	<	lock.writeLock().lock();
1002	<	assertTrue(c.hasWaiters());
1003	<	assertEquals(2, c.getWaitQueueLength());
1004	<	c.signalAll();
1005	<	lock.writeLock().unlock();
1006	<	Thread.sleep(SHORT_DELAY_MS);
1007	<	lock.writeLock().lock();
1008	<	assertFalse(c.hasWaiters());
1009	<	assertEquals(0, c.getWaitQueueLength());
1010	<	lock.writeLock().unlock();
1011	<	t1.join(SHORT_DELAY_MS);
1012	<	t2.join(SHORT_DELAY_MS);
1013	<	assertFalse(t1.isAlive());
1014	<	assertFalse(t2.isAlive());
1015	<	}
1016	<	catch (Exception ex) {
1017	<	unexpectedException();
1018	<	}
1388	>	lock.hasWaiters(c);
1389	>	shouldThrow();
1390	>	} catch (IllegalMonitorStateException success) {}
1391		}
1392
1393		/**
1394	<	* getWaitingThreads returns only and all waiting threads
1394	>	* getWaitQueueLength throws IllegalArgumentException if not owned
1395		*/
1396	<	public void testGetWaitingThreads() {
1397	<	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1398	<	final PublicReentrantReadWriteLock.PublicCondition c = (PublicReentrantReadWriteLock.PublicCondition)lock.newCondition();
1399	<	Thread t1 = new Thread(new Runnable() {
1400	<	public void run() {
1401	<	try {
1402	<	lock.writeLock().lock();
1403	<	threadAssertTrue(c.getWaitingThreads().isEmpty());
1404	<	c.await();
1033	<	lock.writeLock().unlock();
1034	<	}
1035	<	catch(InterruptedException e) {
1036	<	threadUnexpectedException();
1037	<	}
1038	<	}
1039	<	});
1040	<
1041	<	Thread t2 = new Thread(new Runnable() {
1042	<	public void run() {
1043	<	try {
1044	<	lock.writeLock().lock();
1045	<	threadAssertFalse(c.getWaitingThreads().isEmpty());
1046	<	c.await();
1047	<	lock.writeLock().unlock();
1048	<	}
1049	<	catch(InterruptedException e) {
1050	<	threadUnexpectedException();
1051	<	}
1052	<	}
1053	<	});
1396	>	public void testGetWaitQueueLengthIAE() {
1397	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1398	>	final Condition c = lock.writeLock().newCondition();
1399	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1400	>	try {
1401	>	lock2.getWaitQueueLength(c);
1402	>	shouldThrow();
1403	>	} catch (IllegalArgumentException success) {}
1404	>	}
1405
1406	+	/**
1407	+	* getWaitQueueLength throws IllegalMonitorStateException if not locked
1408	+	*/
1409	+	public void testGetWaitQueueLengthIMSE() {
1410	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1411	+	final Condition c = lock.writeLock().newCondition();
1412		try {
1413	<	lock.writeLock().lock();
1414	<	assertTrue(c.getWaitingThreads().isEmpty());
1415	<	lock.writeLock().unlock();
1416	<	t1.start();
1417	<	Thread.sleep(SHORT_DELAY_MS);
1418	<	t2.start();
1419	<	Thread.sleep(SHORT_DELAY_MS);
1420	<	lock.writeLock().lock();
1421	<	assertTrue(c.hasWaiters());
1422	<	assertTrue(c.getWaitingThreads().contains(t1));
1423	<	assertTrue(c.getWaitingThreads().contains(t2));
1424	<	c.signalAll();
1425	<	lock.writeLock().unlock();
1426	<	Thread.sleep(SHORT_DELAY_MS);
1427	<	lock.writeLock().lock();
1428	<	assertFalse(c.hasWaiters());
1429	<	assertTrue(c.getWaitingThreads().isEmpty());
1430	<	lock.writeLock().unlock();
1431	<	t1.join(SHORT_DELAY_MS);
1432	<	t2.join(SHORT_DELAY_MS);
1433	<	assertFalse(t1.isAlive());
1434	<	assertFalse(t2.isAlive());
1435	<	}
1436	<	catch (Exception ex) {
1437	<	unexpectedException();
1438	<	}
1413	>	lock.getWaitQueueLength(c);
1414	>	shouldThrow();
1415	>	} catch (IllegalMonitorStateException success) {}
1416	>	}
1417	>
1418	>	/**
1419	>	* getWaitingThreads throws IllegalArgumentException if not owned
1420	>	*/
1421	>	public void testGetWaitingThreadsIAE() {
1422	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1423	>	final Condition c = lock.writeLock().newCondition();
1424	>	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1425	>	try {
1426	>	lock2.getWaitingThreads(c);
1427	>	shouldThrow();
1428	>	} catch (IllegalArgumentException success) {}
1429	>	}
1430	>
1431	>	/**
1432	>	* getWaitingThreads throws IllegalMonitorStateException if not locked
1433	>	*/
1434	>	public void testGetWaitingThreadsIMSE() {
1435	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1436	>	final Condition c = lock.writeLock().newCondition();
1437	>	try {
1438	>	lock.getWaitingThreads(c);
1439	>	shouldThrow();
1440	>	} catch (IllegalMonitorStateException success) {}
1441	>	}
1442	>
1443	>	/**
1444	>	* hasWaiters returns true when a thread is waiting, else false
1445	>	*/
1446	>	public void testHasWaiters() throws InterruptedException {
1447	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1448	>	final Condition c = lock.writeLock().newCondition();
1449	>	final CountDownLatch locked = new CountDownLatch(1);
1450	>	Thread t = newStartedThread(new CheckedRunnable() {
1451	>	public void realRun() throws InterruptedException {
1452	>	lock.writeLock().lock();
1453	>	assertHasNoWaiters(lock, c);
1454	>	assertFalse(lock.hasWaiters(c));
1455	>	locked.countDown();
1456	>	c.await();
1457	>	assertHasNoWaiters(lock, c);
1458	>	assertFalse(lock.hasWaiters(c));
1459	>	lock.writeLock().unlock();
1460	>	}});
1461	>
1462	>	locked.await();
1463	>	lock.writeLock().lock();
1464	>	assertHasWaiters(lock, c, t);
1465	>	assertTrue(lock.hasWaiters(c));
1466	>	c.signal();
1467	>	assertHasNoWaiters(lock, c);
1468	>	assertFalse(lock.hasWaiters(c));
1469	>	lock.writeLock().unlock();
1470	>	awaitTermination(t);
1471	>	assertHasNoWaiters(lock, c);
1472	>	}
1473	>
1474	>	/**
1475	>	* getWaitQueueLength returns number of waiting threads
1476	>	*/
1477	>	public void testGetWaitQueueLength() throws InterruptedException {
1478	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1479	>	final Condition c = lock.writeLock().newCondition();
1480	>	final CountDownLatch locked = new CountDownLatch(1);
1481	>	Thread t = newStartedThread(new CheckedRunnable() {
1482	>	public void realRun() throws InterruptedException {
1483	>	lock.writeLock().lock();
1484	>	assertEquals(0, lock.getWaitQueueLength(c));
1485	>	locked.countDown();
1486	>	c.await();
1487	>	lock.writeLock().unlock();
1488	>	}});
1489	>
1490	>	locked.await();
1491	>	lock.writeLock().lock();
1492	>	assertHasWaiters(lock, c, t);
1493	>	assertEquals(1, lock.getWaitQueueLength(c));
1494	>	c.signal();
1495	>	assertHasNoWaiters(lock, c);
1496	>	assertEquals(0, lock.getWaitQueueLength(c));
1497	>	lock.writeLock().unlock();
1498	>	awaitTermination(t);
1499	>	}
1500	>
1501	>	/**
1502	>	* getWaitingThreads returns only and all waiting threads
1503	>	*/
1504	>	public void testGetWaitingThreads() throws InterruptedException {
1505	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1506	>	final Condition c = lock.writeLock().newCondition();
1507	>	final CountDownLatch locked1 = new CountDownLatch(1);
1508	>	final CountDownLatch locked2 = new CountDownLatch(1);
1509	>	Thread t1 = new Thread(new CheckedRunnable() {
1510	>	public void realRun() throws InterruptedException {
1511	>	lock.writeLock().lock();
1512	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1513	>	locked1.countDown();
1514	>	c.await();
1515	>	lock.writeLock().unlock();
1516	>	}});
1517	>
1518	>	Thread t2 = new Thread(new CheckedRunnable() {
1519	>	public void realRun() throws InterruptedException {
1520	>	lock.writeLock().lock();
1521	>	assertFalse(lock.getWaitingThreads(c).isEmpty());
1522	>	locked2.countDown();
1523	>	c.await();
1524	>	lock.writeLock().unlock();
1525	>	}});
1526	>
1527	>	lock.writeLock().lock();
1528	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1529	>	lock.writeLock().unlock();
1530	>
1531	>	t1.start();
1532	>	locked1.await();
1533	>	t2.start();
1534	>	locked2.await();
1535	>
1536	>	lock.writeLock().lock();
1537	>	assertTrue(lock.hasWaiters(c));
1538	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
1539	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
1540	>	assertEquals(2, lock.getWaitingThreads(c).size());
1541	>	c.signalAll();
1542	>	assertHasNoWaiters(lock, c);
1543	>	lock.writeLock().unlock();
1544	>
1545	>	awaitTermination(t1);
1546	>	awaitTermination(t2);
1547	>
1548	>	assertHasNoWaiters(lock, c);
1549	>	}
1550	>
1551	>	/**
1552	>	* toString indicates current lock state
1553	>	*/
1554	>	public void testToString() {
1555	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1556	>	String us = lock.toString();
1557	>	assertTrue(us.indexOf("Write locks = 0") >= 0);
1558	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1559	>	lock.writeLock().lock();
1560	>	String ws = lock.toString();
1561	>	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1562	>	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1563	>	lock.writeLock().unlock();
1564	>	lock.readLock().lock();
1565	>	lock.readLock().lock();
1566	>	String rs = lock.toString();
1567	>	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1568	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1569	>	}
1570	>
1571	>	/**
1572	>	* readLock.toString indicates current lock state
1573	>	*/
1574	>	public void testReadLockToString() {
1575	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1576	>	String us = lock.readLock().toString();
1577	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1578	>	lock.readLock().lock();
1579	>	lock.readLock().lock();
1580	>	String rs = lock.readLock().toString();
1581	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1582	>	}
1583	>
1584	>	/**
1585	>	* writeLock.toString indicates current lock state
1586	>	*/
1587	>	public void testWriteLockToString() {
1588	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1589	>	String us = lock.writeLock().toString();
1590	>	assertTrue(us.indexOf("Unlocked") >= 0);
1591	>	lock.writeLock().lock();
1592	>	String ls = lock.writeLock().toString();
1593	>	assertTrue(ls.indexOf("Locked") >= 0);
1594		}
1595
1596		}

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