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Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.5 by dl, Fri Sep 26 15:33:13 2003 UTC vs.
Revision 1.81 by jsr166, Mon Jul 17 21:01:30 2017 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.*;
9	<	import java.util.concurrent.locks.*;
10	<	import java.util.concurrent.*;
11	<	import java.io.*;
9	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
10
11	+	import java.util.Arrays;
12	+	import java.util.Collection;
13	+	import java.util.HashSet;
14	+	import java.util.concurrent.CountDownLatch;
15	+	import java.util.concurrent.atomic.AtomicBoolean;
16	+	import java.util.concurrent.locks.Condition;
17	+	import java.util.concurrent.locks.Lock;
18	+	import java.util.concurrent.locks.ReentrantReadWriteLock;
19	+
20	+	import junit.framework.AssertionFailedError;
21	+	import junit.framework.Test;
22	+	import junit.framework.TestSuite;
23	+
24	+	@SuppressWarnings("WaitNotInLoop") // we implement spurious-wakeup freedom
25		public class ReentrantReadWriteLockTest extends JSR166TestCase {
26		public static void main(String[] args) {
27	<	junit.textui.TestRunner.run (suite());
27	>	main(suite(), args);
28		}
29		public static Test suite() {
30	<	return new TestSuite(ReentrantReadWriteLockTest.class);
30	>	return new TestSuite(ReentrantReadWriteLockTest.class);
31		}
32
33	+	/**
34	+	* A runnable calling lockInterruptibly
35	+	*/
36	+	class InterruptibleLockRunnable extends CheckedRunnable {
37	+	final ReentrantReadWriteLock lock;
38	+	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
39	+	public void realRun() throws InterruptedException {
40	+	lock.writeLock().lockInterruptibly();
41	+	}
42	+	}
43
44		/**
45	<	* write-locking and read-locking an unlocked lock succeed
45	>	* A runnable calling lockInterruptibly that expects to be
46	>	* interrupted
47		*/
48	<	public void testLock() {
49	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
50	<	rl.writeLock().lock();
51	<	rl.writeLock().unlock();
52	<	rl.readLock().lock();
53	<	rl.readLock().unlock();
48	>	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
49	>	final ReentrantReadWriteLock lock;
50	>	InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
51	>	public void realRun() throws InterruptedException {
52	>	lock.writeLock().lockInterruptibly();
53	>	}
54		}
55
56	+	/**
57	+	* Subclass to expose protected methods
58	+	*/
59	+	static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
60	+	PublicReentrantReadWriteLock() { super(); }
61	+	PublicReentrantReadWriteLock(boolean fair) { super(fair); }
62	+	public Thread getOwner() {
63	+	return super.getOwner();
64	+	}
65	+	public Collection<Thread> getQueuedThreads() {
66	+	return super.getQueuedThreads();
67	+	}
68	+	public Collection<Thread> getWaitingThreads(Condition c) {
69	+	return super.getWaitingThreads(c);
70	+	}
71	+	}
72
73		/**
74	<	* locking an unlocked fair lock succeeds
74	>	* Releases write lock, checking that it had a hold count of 1.
75		*/
76	<	public void testFairLock() {
77	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
78	<	rl.writeLock().lock();
79	<	rl.writeLock().unlock();
80	<	rl.readLock().lock();
81	<	rl.readLock().unlock();
76	>	void releaseWriteLock(PublicReentrantReadWriteLock lock) {
77	>	ReentrantReadWriteLock.WriteLock writeLock = lock.writeLock();
78	>	assertWriteLockedByMoi(lock);
79	>	assertEquals(1, lock.getWriteHoldCount());
80	>	writeLock.unlock();
81	>	assertNotWriteLocked(lock);
82		}
83
84		/**
85	<	* write-unlocking an unlocked lock throws IllegalMonitorStateException
85	>	* Spin-waits until lock.hasQueuedThread(t) becomes true.
86		*/
87	<	public void testUnlock_IllegalMonitorStateException() {
88	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
89	<	try {
90	<	rl.writeLock().unlock();
91	<	shouldThrow();
92	<	} catch(IllegalMonitorStateException success){}
87	>	void waitForQueuedThread(PublicReentrantReadWriteLock lock, Thread t) {
88	>	long startTime = System.nanoTime();
89	>	while (!lock.hasQueuedThread(t)) {
90	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
91	>	throw new AssertionFailedError("timed out");
92	>	Thread.yield();
93	>	}
94	>	assertTrue(t.isAlive());
95	>	assertNotSame(t, lock.getOwner());
96		}
97
98	+	/**
99	+	* Checks that lock is not write-locked.
100	+	*/
101	+	void assertNotWriteLocked(PublicReentrantReadWriteLock lock) {
102	+	assertFalse(lock.isWriteLocked());
103	+	assertFalse(lock.isWriteLockedByCurrentThread());
104	+	assertFalse(lock.writeLock().isHeldByCurrentThread());
105	+	assertEquals(0, lock.getWriteHoldCount());
106	+	assertEquals(0, lock.writeLock().getHoldCount());
107	+	assertNull(lock.getOwner());
108	+	}
109
110		/**
111	<	* write-lockInterruptibly is interruptible
111	>	* Checks that lock is write-locked by the given thread.
112		*/
113	<	public void testWriteLockInterruptibly_Interrupted() {
114	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
115	<	lock.writeLock().lock();
116	<	Thread t = new Thread(new Runnable() {
117	<	public void run() {
118	<	try {
119	<	lock.writeLock().lockInterruptibly();
120	<	threadShouldThrow();
121	<	} catch(InterruptedException success){}
122	<	}
123	<	});
124	<	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();
98	<	lock.writeLock().unlock();
99	<	t.join();
100	<	} catch(Exception e){
101	<	unexpectedException();
102	<	}
113	>	void assertWriteLockedBy(PublicReentrantReadWriteLock lock, Thread t) {
114	>	assertTrue(lock.isWriteLocked());
115	>	assertSame(t, lock.getOwner());
116	>	assertEquals(t == Thread.currentThread(),
117	>	lock.isWriteLockedByCurrentThread());
118	>	assertEquals(t == Thread.currentThread(),
119	>	lock.writeLock().isHeldByCurrentThread());
120	>	assertEquals(t == Thread.currentThread(),
121	>	lock.getWriteHoldCount() > 0);
122	>	assertEquals(t == Thread.currentThread(),
123	>	lock.writeLock().getHoldCount() > 0);
124	>	assertEquals(0, lock.getReadLockCount());
125		}
126
127		/**
128	<	* read-lockInterruptibly is interruptible
128	>	* Checks that lock is write-locked by the current thread.
129		*/
130	<	public void testReadLockInterruptibly_Interrupted() {
131	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
132	<	lock.writeLock().lock();
133	<	Thread t = new Thread(new Runnable() {
134	<	public void run() {
135	<	try {
136	<	lock.readLock().lockInterruptibly();
137	<	threadShouldThrow();
138	<	} catch(InterruptedException success){}
139	<	}
140	<	});
141	<	try {
142	<	t.start();
143	<	t.interrupt();
144	<	lock.writeLock().unlock();
145	<	t.join();
146	<	} catch(Exception e){
147	<	unexpectedException();
148	<	}
149	<	}
150	<
151	<	/**
152	<	* timed read-trylock is interruptible
153	<	*/
154	<	public void testReadTryLock_Interrupted() {
155	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
156	<	lock.writeLock().lock();
157	<	Thread t = new Thread(new Runnable() {
158	<	public void run() {
159	<	try {
160	<	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
161	<	threadShouldThrow();
162	<	} catch(InterruptedException success){}
163	<	}
164	<	});
165	<	try {
166	<	t.start();
167	<	t.interrupt();
168	<	t.join();
169	<	} catch(Exception e){
170	<	unexpectedException();
130	>	void assertWriteLockedByMoi(PublicReentrantReadWriteLock lock) {
131	>	assertWriteLockedBy(lock, Thread.currentThread());
132	>	}
133	>
134	>	/**
135	>	* Checks that condition c has no waiters.
136	>	*/
137	>	void assertHasNoWaiters(PublicReentrantReadWriteLock lock, Condition c) {
138	>	assertHasWaiters(lock, c, new Thread[] {});
139	>	}
140	>
141	>	/**
142	>	* Checks that condition c has exactly the given waiter threads.
143	>	*/
144	>	void assertHasWaiters(PublicReentrantReadWriteLock lock, Condition c,
145	>	Thread... threads) {
146	>	lock.writeLock().lock();
147	>	assertEquals(threads.length > 0, lock.hasWaiters(c));
148	>	assertEquals(threads.length, lock.getWaitQueueLength(c));
149	>	assertEquals(threads.length == 0, lock.getWaitingThreads(c).isEmpty());
150	>	assertEquals(threads.length, lock.getWaitingThreads(c).size());
151	>	assertEquals(new HashSet<Thread>(lock.getWaitingThreads(c)),
152	>	new HashSet<Thread>(Arrays.asList(threads)));
153	>	lock.writeLock().unlock();
154	>	}
155	>
156	>	enum AwaitMethod { await, awaitTimed, awaitNanos, awaitUntil }
157	>
158	>	/**
159	>	* Awaits condition "indefinitely" using the specified AwaitMethod.
160	>	*/
161	>	void await(Condition c, AwaitMethod awaitMethod)
162	>	throws InterruptedException {
163	>	long timeoutMillis = 2 * LONG_DELAY_MS;
164	>	switch (awaitMethod) {
165	>	case await:
166	>	c.await();
167	>	break;
168	>	case awaitTimed:
169	>	assertTrue(c.await(timeoutMillis, MILLISECONDS));
170	>	break;
171	>	case awaitNanos:
172	>	long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis);
173	>	long nanosRemaining = c.awaitNanos(timeoutNanos);
174	>	assertTrue(nanosRemaining > timeoutNanos / 2);
175	>	assertTrue(nanosRemaining <= timeoutNanos);
176	>	break;
177	>	case awaitUntil:
178	>	assertTrue(c.awaitUntil(delayedDate(timeoutMillis)));
179	>	break;
180	>	default:
181	>	throw new AssertionError();
182		}
183		}
184
185	<
186	<	/**
187	<	* write-trylock fails if locked
188	<	*/
189	<	public void testWriteTryLockWhenLocked() {
190	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
191	<	lock.writeLock().lock();
192	<	Thread t = new Thread(new Runnable() {
193	<	public void run() {
194	<	threadAssertFalse(lock.writeLock().tryLock());
195	<	}
196	<	});
197	<	try {
198	<	t.start();
199	<	t.join();
185	>	/**
186	>	* Constructor sets given fairness, and is in unlocked state
187	>	*/
188	>	public void testConstructor() {
189	>	PublicReentrantReadWriteLock lock;
190	>
191	>	lock = new PublicReentrantReadWriteLock();
192	>	assertFalse(lock.isFair());
193	>	assertNotWriteLocked(lock);
194	>	assertEquals(0, lock.getReadLockCount());
195	>
196	>	lock = new PublicReentrantReadWriteLock(true);
197	>	assertTrue(lock.isFair());
198	>	assertNotWriteLocked(lock);
199	>	assertEquals(0, lock.getReadLockCount());
200	>
201	>	lock = new PublicReentrantReadWriteLock(false);
202	>	assertFalse(lock.isFair());
203	>	assertNotWriteLocked(lock);
204	>	assertEquals(0, lock.getReadLockCount());
205	>	}
206	>
207	>	/**
208	>	* write-locking and read-locking an unlocked lock succeed
209	>	*/
210	>	public void testLock()      { testLock(false); }
211	>	public void testLock_fair() { testLock(true); }
212	>	public void testLock(boolean fair) {
213	>	PublicReentrantReadWriteLock lock =
214	>	new PublicReentrantReadWriteLock(fair);
215	>	assertNotWriteLocked(lock);
216	>	lock.writeLock().lock();
217	>	assertWriteLockedByMoi(lock);
218	>	lock.writeLock().unlock();
219	>	assertNotWriteLocked(lock);
220	>	assertEquals(0, lock.getReadLockCount());
221	>	lock.readLock().lock();
222	>	assertNotWriteLocked(lock);
223	>	assertEquals(1, lock.getReadLockCount());
224	>	lock.readLock().unlock();
225	>	assertNotWriteLocked(lock);
226	>	assertEquals(0, lock.getReadLockCount());
227	>	}
228	>
229	>	/**
230	>	* getWriteHoldCount returns number of recursive holds
231	>	*/
232	>	public void testGetWriteHoldCount()      { testGetWriteHoldCount(false); }
233	>	public void testGetWriteHoldCount_fair() { testGetWriteHoldCount(true); }
234	>	public void testGetWriteHoldCount(boolean fair) {
235	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
236	>	for (int i = 1; i <= SIZE; i++) {
237	>	lock.writeLock().lock();
238	>	assertEquals(i,lock.getWriteHoldCount());
239	>	}
240	>	for (int i = SIZE; i > 0; i--) {
241		lock.writeLock().unlock();
242	<	} catch(Exception e){
169	<	unexpectedException();
242	>	assertEquals(i - 1,lock.getWriteHoldCount());
243		}
244	<	}
244	>	}
245
246		/**
247	<	* read-trylock fails if locked
247	>	* writelock.getHoldCount returns number of recursive holds
248		*/
249	<	public void testReadTryLockWhenLocked() {
250	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
251	<	lock.writeLock().lock();
252	<	Thread t = new Thread(new Runnable() {
253	<	public void run() {
254	<	threadAssertFalse(lock.readLock().tryLock());
255	<	}
256	<	});
257	<	try {
185	<	t.start();
186	<	t.join();
249	>	public void testGetHoldCount()      { testGetHoldCount(false); }
250	>	public void testGetHoldCount_fair() { testGetHoldCount(true); }
251	>	public void testGetHoldCount(boolean fair) {
252	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
253	>	for (int i = 1; i <= SIZE; i++) {
254	>	lock.writeLock().lock();
255	>	assertEquals(i,lock.writeLock().getHoldCount());
256	>	}
257	>	for (int i = SIZE; i > 0; i--) {
258		lock.writeLock().unlock();
259	<	} catch(Exception e){
189	<	unexpectedException();
259	>	assertEquals(i - 1,lock.writeLock().getHoldCount());
260		}
261	<	}
261	>	}
262
263		/**
264	<	* Multiple threads can hold a read lock when not write-locked
264	>	* getReadHoldCount returns number of recursive holds
265		*/
266	<	public void testMultipleReadLocks() {
267	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
268	<	lock.readLock().lock();
269	<	Thread t = new Thread(new Runnable() {
270	<	public void run() {
271	<	threadAssertTrue(lock.readLock().tryLock());
272	<	lock.readLock().unlock();
273	<	}
274	<	});
205	<	try {
206	<	t.start();
207	<	t.join();
266	>	public void testGetReadHoldCount()      { testGetReadHoldCount(false); }
267	>	public void testGetReadHoldCount_fair() { testGetReadHoldCount(true); }
268	>	public void testGetReadHoldCount(boolean fair) {
269	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
270	>	for (int i = 1; i <= SIZE; i++) {
271	>	lock.readLock().lock();
272	>	assertEquals(i,lock.getReadHoldCount());
273	>	}
274	>	for (int i = SIZE; i > 0; i--) {
275		lock.readLock().unlock();
276	<	} catch(Exception e){
210	<	unexpectedException();
276	>	assertEquals(i - 1,lock.getReadHoldCount());
277		}
278	<	}
278	>	}
279
280		/**
281	<	* A writelock succeeds after reading threads unlock
281	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
282		*/
283	<	public void testWriteAfterMultipleReadLocks() {
284	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
285	<	lock.readLock().lock();
286	<	Thread t1 = new Thread(new Runnable() {
221	<	public void run() {
222	<	lock.readLock().lock();
223	<	lock.readLock().unlock();
224	<	}
225	<	});
226	<	Thread t2 = new Thread(new Runnable() {
227	<	public void run() {
228	<	lock.writeLock().lock();
229	<	lock.writeLock().unlock();
230	<	}
231	<	});
232	<
283	>	public void testWriteUnlock_IMSE()      { testWriteUnlock_IMSE(false); }
284	>	public void testWriteUnlock_IMSE_fair() { testWriteUnlock_IMSE(true); }
285	>	public void testWriteUnlock_IMSE(boolean fair) {
286	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
287		try {
234	–	t1.start();
235	–	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	–	}
247	–
248	–	/**
249	–	* Readlocks succeed after a writing thread unlocks
250	–	*/
251	–	public void testReadAfterWriteLock() {
252	–	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
253	–	lock.writeLock().lock();
254	–	Thread t1 = new Thread(new Runnable() {
255	–	public void run() {
256	–	lock.readLock().lock();
257	–	lock.readLock().unlock();
258	–	}
259	–	});
260	–	Thread t2 = new Thread(new Runnable() {
261	–	public void run() {
262	–	lock.readLock().lock();
263	–	lock.readLock().unlock();
264	–	}
265	–	});
266	–
267	–	try {
268	–	t1.start();
269	–	t2.start();
270	–	Thread.sleep(SHORT_DELAY_MS);
288		lock.writeLock().unlock();
289	<	t1.join(MEDIUM_DELAY_MS);
290	<	t2.join(MEDIUM_DELAY_MS);
291	<	assertTrue(!t1.isAlive());
275	<	assertTrue(!t2.isAlive());
276	<
277	<	} catch(Exception e){
278	<	unexpectedException();
279	<	}
280	<	}
281	<
289	>	shouldThrow();
290	>	} catch (IllegalMonitorStateException success) {}
291	>	}
292
293		/**
294	<	* Read trylock succeeds if readlocked but not writelocked
295	<	*/
296	<	public void testTryLockWhenReadLocked() {
297	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
298	<	lock.readLock().lock();
299	<	Thread t = new Thread(new Runnable() {
290	<	public void run() {
291	<	threadAssertTrue(lock.readLock().tryLock());
292	<	lock.readLock().unlock();
293	<	}
294	<	});
294	>	* read-unlocking an unlocked lock throws IllegalMonitorStateException
295	>	*/
296	>	public void testReadUnlock_IMSE()      { testReadUnlock_IMSE(false); }
297	>	public void testReadUnlock_IMSE_fair() { testReadUnlock_IMSE(true); }
298	>	public void testReadUnlock_IMSE(boolean fair) {
299	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
300		try {
296	–	t.start();
297	–	t.join();
301		lock.readLock().unlock();
302	<	} catch(Exception e){
303	<	unexpectedException();
304	<	}
302	<	}
303	<
304	<
302	>	shouldThrow();
303	>	} catch (IllegalMonitorStateException success) {}
304	>	}
305
306		/**
307	<	* write trylock fails when readlocked
307	>	* write-lockInterruptibly is interruptible
308		*/
309	<	public void testWriteTryLockWhenReadLocked() {
310	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
311	<	lock.readLock().lock();
312	<	Thread t = new Thread(new Runnable() {
313	<	public void run() {
314	<	threadAssertFalse(lock.writeLock().tryLock());
315	<	}
316	<	});
317	<	try {
318	<	t.start();
319	<	t.join();
320	<	lock.readLock().unlock();
321	<	} catch(Exception e){
322	<	unexpectedException();
323	<	}
324	<	}
325	<
326	<
309	>	public void testWriteLockInterruptibly_Interruptible()      { testWriteLockInterruptibly_Interruptible(false); }
310	>	public void testWriteLockInterruptibly_Interruptible_fair() { testWriteLockInterruptibly_Interruptible(true); }
311	>	public void testWriteLockInterruptibly_Interruptible(boolean fair) {
312	>	final PublicReentrantReadWriteLock lock =
313	>	new PublicReentrantReadWriteLock(fair);
314	>	lock.writeLock().lock();
315	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
316	>	public void realRun() throws InterruptedException {
317	>	lock.writeLock().lockInterruptibly();
318	>	}});
319	>
320	>	waitForQueuedThread(lock, t);
321	>	t.interrupt();
322	>	awaitTermination(t);
323	>	releaseWriteLock(lock);
324	>	}
325
326		/**
327	<	* write timed trylock times out if locked
328	<	*/
329	<	public void testWriteTryLock_Timeout() {
330	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
331	<	lock.writeLock().lock();
332	<	Thread t = new Thread(new Runnable() {
333	<	public void run() {
334	<	try {
335	<	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
336	<	} catch (Exception ex) {
337	<	threadUnexpectedException();
338	<	}
339	<	}
340	<	});
341	<	try {
342	<	t.start();
343	<	t.join();
344	<	lock.writeLock().unlock();
347	<	} catch(Exception e){
348	<	unexpectedException();
349	<	}
350	<	}
327	>	* timed write-tryLock is interruptible
328	>	*/
329	>	public void testWriteTryLock_Interruptible()      { testWriteTryLock_Interruptible(false); }
330	>	public void testWriteTryLock_Interruptible_fair() { testWriteTryLock_Interruptible(true); }
331	>	public void testWriteTryLock_Interruptible(boolean fair) {
332	>	final PublicReentrantReadWriteLock lock =
333	>	new PublicReentrantReadWriteLock(fair);
334	>	lock.writeLock().lock();
335	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
336	>	public void realRun() throws InterruptedException {
337	>	lock.writeLock().tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
338	>	}});
339	>
340	>	waitForQueuedThread(lock, t);
341	>	t.interrupt();
342	>	awaitTermination(t);
343	>	releaseWriteLock(lock);
344	>	}
345
346		/**
347	<	* read timed trylock times out if write-locked
347	>	* read-lockInterruptibly is interruptible
348		*/
349	<	public void testReadTryLock_Timeout() {
350	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
351	<	lock.writeLock().lock();
352	<	Thread t = new Thread(new Runnable() {
353	<	public void run() {
354	<	try {
355	<	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
356	<	} catch (Exception ex) {
357	<	threadUnexpectedException();
358	<	}
359	<	}
360	<	});
361	<	try {
362	<	t.start();
363	<	t.join();
364	<	lock.writeLock().unlock();
365	<	} catch(Exception e){
366	<	unexpectedException();
367	<	}
368	<	}
349	>	public void testReadLockInterruptibly_Interruptible()      { testReadLockInterruptibly_Interruptible(false); }
350	>	public void testReadLockInterruptibly_Interruptible_fair() { testReadLockInterruptibly_Interruptible(true); }
351	>	public void testReadLockInterruptibly_Interruptible(boolean fair) {
352	>	final PublicReentrantReadWriteLock lock =
353	>	new PublicReentrantReadWriteLock(fair);
354	>	lock.writeLock().lock();
355	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
356	>	public void realRun() throws InterruptedException {
357	>	lock.readLock().lockInterruptibly();
358	>	}});
359	>
360	>	waitForQueuedThread(lock, t);
361	>	t.interrupt();
362	>	awaitTermination(t);
363	>	releaseWriteLock(lock);
364	>	}
365	>
366	>	/**
367	>	* timed read-tryLock is interruptible
368	>	*/
369	>	public void testReadTryLock_Interruptible()      { testReadTryLock_Interruptible(false); }
370	>	public void testReadTryLock_Interruptible_fair() { testReadTryLock_Interruptible(true); }
371	>	public void testReadTryLock_Interruptible(boolean fair) {
372	>	final PublicReentrantReadWriteLock lock =
373	>	new PublicReentrantReadWriteLock(fair);
374	>	lock.writeLock().lock();
375	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
376	>	public void realRun() throws InterruptedException {
377	>	lock.readLock().tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
378	>	}});
379	>
380	>	waitForQueuedThread(lock, t);
381	>	t.interrupt();
382	>	awaitTermination(t);
383	>	releaseWriteLock(lock);
384	>	}
385	>
386	>	/**
387	>	* write-tryLock on an unlocked lock succeeds
388	>	*/
389	>	public void testWriteTryLock()      { testWriteTryLock(false); }
390	>	public void testWriteTryLock_fair() { testWriteTryLock(true); }
391	>	public void testWriteTryLock(boolean fair) {
392	>	final PublicReentrantReadWriteLock lock =
393	>	new PublicReentrantReadWriteLock(fair);
394	>	assertTrue(lock.writeLock().tryLock());
395	>	assertWriteLockedByMoi(lock);
396	>	assertTrue(lock.writeLock().tryLock());
397	>	assertWriteLockedByMoi(lock);
398	>	lock.writeLock().unlock();
399	>	releaseWriteLock(lock);
400	>	}
401	>
402	>	/**
403	>	* write-tryLock fails if locked
404	>	*/
405	>	public void testWriteTryLockWhenLocked()      { testWriteTryLockWhenLocked(false); }
406	>	public void testWriteTryLockWhenLocked_fair() { testWriteTryLockWhenLocked(true); }
407	>	public void testWriteTryLockWhenLocked(boolean fair) {
408	>	final PublicReentrantReadWriteLock lock =
409	>	new PublicReentrantReadWriteLock(fair);
410	>	lock.writeLock().lock();
411	>	Thread t = newStartedThread(new CheckedRunnable() {
412	>	public void realRun() {
413	>	assertFalse(lock.writeLock().tryLock());
414	>	}});
415	>
416	>	awaitTermination(t);
417	>	releaseWriteLock(lock);
418	>	}
419	>
420	>	/**
421	>	* read-tryLock fails if locked
422	>	*/
423	>	public void testReadTryLockWhenLocked()      { testReadTryLockWhenLocked(false); }
424	>	public void testReadTryLockWhenLocked_fair() { testReadTryLockWhenLocked(true); }
425	>	public void testReadTryLockWhenLocked(boolean fair) {
426	>	final PublicReentrantReadWriteLock lock =
427	>	new PublicReentrantReadWriteLock(fair);
428	>	lock.writeLock().lock();
429	>	Thread t = newStartedThread(new CheckedRunnable() {
430	>	public void realRun() {
431	>	assertFalse(lock.readLock().tryLock());
432	>	}});
433
434	+	awaitTermination(t);
435	+	releaseWriteLock(lock);
436	+	}
437
438		/**
439	<	* write lockInterruptibly succeeds if lock free else is interruptible
439	>	* Multiple threads can hold a read lock when not write-locked
440		*/
441	<	public void testWriteLockInterruptibly() {
442	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
443	<	try {
441	>	public void testMultipleReadLocks()      { testMultipleReadLocks(false); }
442	>	public void testMultipleReadLocks_fair() { testMultipleReadLocks(true); }
443	>	public void testMultipleReadLocks(boolean fair) {
444	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
445	>	lock.readLock().lock();
446	>	Thread t = newStartedThread(new CheckedRunnable() {
447	>	public void realRun() throws InterruptedException {
448	>	assertTrue(lock.readLock().tryLock());
449	>	lock.readLock().unlock();
450	>	assertTrue(lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS));
451	>	lock.readLock().unlock();
452	>	lock.readLock().lock();
453	>	lock.readLock().unlock();
454	>	}});
455	>
456	>	awaitTermination(t);
457	>	lock.readLock().unlock();
458	>	}
459	>
460	>	/**
461	>	* A writelock succeeds only after a reading thread unlocks
462	>	*/
463	>	public void testWriteAfterReadLock()      { testWriteAfterReadLock(false); }
464	>	public void testWriteAfterReadLock_fair() { testWriteAfterReadLock(true); }
465	>	public void testWriteAfterReadLock(boolean fair) {
466	>	final PublicReentrantReadWriteLock lock =
467	>	new PublicReentrantReadWriteLock(fair);
468	>	lock.readLock().lock();
469	>	Thread t = newStartedThread(new CheckedRunnable() {
470	>	public void realRun() {
471	>	assertEquals(1, lock.getReadLockCount());
472	>	lock.writeLock().lock();
473	>	assertEquals(0, lock.getReadLockCount());
474	>	lock.writeLock().unlock();
475	>	}});
476	>	waitForQueuedThread(lock, t);
477	>	assertNotWriteLocked(lock);
478	>	assertEquals(1, lock.getReadLockCount());
479	>	lock.readLock().unlock();
480	>	assertEquals(0, lock.getReadLockCount());
481	>	awaitTermination(t);
482	>	assertNotWriteLocked(lock);
483	>	}
484	>
485	>	/**
486	>	* A writelock succeeds only after reading threads unlock
487	>	*/
488	>	public void testWriteAfterMultipleReadLocks()      { testWriteAfterMultipleReadLocks(false); }
489	>	public void testWriteAfterMultipleReadLocks_fair() { testWriteAfterMultipleReadLocks(true); }
490	>	public void testWriteAfterMultipleReadLocks(boolean fair) {
491	>	final PublicReentrantReadWriteLock lock =
492	>	new PublicReentrantReadWriteLock(fair);
493	>	lock.readLock().lock();
494	>	lock.readLock().lock();
495	>	Thread t1 = newStartedThread(new CheckedRunnable() {
496	>	public void realRun() {
497	>	lock.readLock().lock();
498	>	assertEquals(3, lock.getReadLockCount());
499	>	lock.readLock().unlock();
500	>	}});
501	>	awaitTermination(t1);
502	>
503	>	Thread t2 = newStartedThread(new CheckedRunnable() {
504	>	public void realRun() {
505	>	assertEquals(2, lock.getReadLockCount());
506	>	lock.writeLock().lock();
507	>	assertEquals(0, lock.getReadLockCount());
508	>	lock.writeLock().unlock();
509	>	}});
510	>	waitForQueuedThread(lock, t2);
511	>	assertNotWriteLocked(lock);
512	>	assertEquals(2, lock.getReadLockCount());
513	>	lock.readLock().unlock();
514	>	lock.readLock().unlock();
515	>	assertEquals(0, lock.getReadLockCount());
516	>	awaitTermination(t2);
517	>	assertNotWriteLocked(lock);
518	>	}
519	>
520	>	/**
521	>	* A thread that tries to acquire a fair read lock (non-reentrantly)
522	>	* will block if there is a waiting writer thread
523	>	*/
524	>	public void testReaderWriterReaderFairFifo() {
525	>	final PublicReentrantReadWriteLock lock =
526	>	new PublicReentrantReadWriteLock(true);
527	>	final AtomicBoolean t1GotLock = new AtomicBoolean(false);
528	>
529	>	lock.readLock().lock();
530	>	Thread t1 = newStartedThread(new CheckedRunnable() {
531	>	public void realRun() {
532	>	assertEquals(1, lock.getReadLockCount());
533	>	lock.writeLock().lock();
534	>	assertEquals(0, lock.getReadLockCount());
535	>	t1GotLock.set(true);
536	>	lock.writeLock().unlock();
537	>	}});
538	>	waitForQueuedThread(lock, t1);
539	>
540	>	Thread t2 = newStartedThread(new CheckedRunnable() {
541	>	public void realRun() {
542	>	assertEquals(1, lock.getReadLockCount());
543	>	lock.readLock().lock();
544	>	assertEquals(1, lock.getReadLockCount());
545	>	assertTrue(t1GotLock.get());
546	>	lock.readLock().unlock();
547	>	}});
548	>	waitForQueuedThread(lock, t2);
549	>	assertTrue(t1.isAlive());
550	>	assertNotWriteLocked(lock);
551	>	assertEquals(1, lock.getReadLockCount());
552	>	lock.readLock().unlock();
553	>	awaitTermination(t1);
554	>	awaitTermination(t2);
555	>	assertNotWriteLocked(lock);
556	>	}
557	>
558	>	/**
559	>	* Readlocks succeed only after a writing thread unlocks
560	>	*/
561	>	public void testReadAfterWriteLock()      { testReadAfterWriteLock(false); }
562	>	public void testReadAfterWriteLock_fair() { testReadAfterWriteLock(true); }
563	>	public void testReadAfterWriteLock(boolean fair) {
564	>	final PublicReentrantReadWriteLock lock =
565	>	new PublicReentrantReadWriteLock(fair);
566	>	lock.writeLock().lock();
567	>	Thread t1 = newStartedThread(new CheckedRunnable() {
568	>	public void realRun() {
569	>	lock.readLock().lock();
570	>	lock.readLock().unlock();
571	>	}});
572	>	Thread t2 = newStartedThread(new CheckedRunnable() {
573	>	public void realRun() {
574	>	lock.readLock().lock();
575	>	lock.readLock().unlock();
576	>	}});
577	>
578	>	waitForQueuedThread(lock, t1);
579	>	waitForQueuedThread(lock, t2);
580	>	releaseWriteLock(lock);
581	>	awaitTermination(t1);
582	>	awaitTermination(t2);
583	>	}
584	>
585	>	/**
586	>	* Read trylock succeeds if write locked by current thread
587	>	*/
588	>	public void testReadHoldingWriteLock()      { testReadHoldingWriteLock(false); }
589	>	public void testReadHoldingWriteLock_fair() { testReadHoldingWriteLock(true); }
590	>	public void testReadHoldingWriteLock(boolean fair) {
591	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
592	>	lock.writeLock().lock();
593	>	assertTrue(lock.readLock().tryLock());
594	>	lock.readLock().unlock();
595	>	lock.writeLock().unlock();
596	>	}
597	>
598	>	/**
599	>	* Read trylock succeeds (barging) even in the presence of waiting
600	>	* readers and/or writers
601	>	*/
602	>	public void testReadTryLockBarging()      { testReadTryLockBarging(false); }
603	>	public void testReadTryLockBarging_fair() { testReadTryLockBarging(true); }
604	>	public void testReadTryLockBarging(boolean fair) {
605	>	final PublicReentrantReadWriteLock lock =
606	>	new PublicReentrantReadWriteLock(fair);
607	>	lock.readLock().lock();
608	>
609	>	Thread t1 = newStartedThread(new CheckedRunnable() {
610	>	public void realRun() {
611	>	lock.writeLock().lock();
612	>	lock.writeLock().unlock();
613	>	}});
614	>
615	>	waitForQueuedThread(lock, t1);
616	>
617	>	Thread t2 = newStartedThread(new CheckedRunnable() {
618	>	public void realRun() {
619	>	lock.readLock().lock();
620	>	lock.readLock().unlock();
621	>	}});
622	>
623	>	if (fair)
624	>	waitForQueuedThread(lock, t2);
625	>
626	>	Thread t3 = newStartedThread(new CheckedRunnable() {
627	>	public void realRun() {
628	>	lock.readLock().tryLock();
629	>	lock.readLock().unlock();
630	>	}});
631	>
632	>	assertTrue(lock.getReadLockCount() > 0);
633	>	awaitTermination(t3);
634	>	assertTrue(t1.isAlive());
635	>	if (fair) assertTrue(t2.isAlive());
636	>	lock.readLock().unlock();
637	>	awaitTermination(t1);
638	>	awaitTermination(t2);
639	>	}
640	>
641	>	/**
642	>	* Read lock succeeds if write locked by current thread even if
643	>	* other threads are waiting for readlock
644	>	*/
645	>	public void testReadHoldingWriteLock2()      { testReadHoldingWriteLock2(false); }
646	>	public void testReadHoldingWriteLock2_fair() { testReadHoldingWriteLock2(true); }
647	>	public void testReadHoldingWriteLock2(boolean fair) {
648	>	final PublicReentrantReadWriteLock lock =
649	>	new PublicReentrantReadWriteLock(fair);
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.readLock().lock();
657	>	lock.readLock().unlock();
658	>	}});
659	>	Thread t2 = newStartedThread(new CheckedRunnable() {
660	>	public void realRun() {
661	>	lock.readLock().lock();
662	>	lock.readLock().unlock();
663	>	}});
664	>
665	>	waitForQueuedThread(lock, t1);
666	>	waitForQueuedThread(lock, t2);
667	>	assertWriteLockedByMoi(lock);
668	>	lock.readLock().lock();
669	>	lock.readLock().unlock();
670	>	releaseWriteLock(lock);
671	>	awaitTermination(t1);
672	>	awaitTermination(t2);
673	>	}
674	>
675	>	/**
676	>	* Read lock succeeds if write locked by current thread even if
677	>	* other threads are waiting for writelock
678	>	*/
679	>	public void testReadHoldingWriteLock3()      { testReadHoldingWriteLock3(false); }
680	>	public void testReadHoldingWriteLock3_fair() { testReadHoldingWriteLock3(true); }
681	>	public void testReadHoldingWriteLock3(boolean fair) {
682	>	final PublicReentrantReadWriteLock lock =
683	>	new PublicReentrantReadWriteLock(fair);
684	>	lock.writeLock().lock();
685	>	lock.readLock().lock();
686	>	lock.readLock().unlock();
687	>
688	>	Thread t1 = newStartedThread(new CheckedRunnable() {
689	>	public void realRun() {
690	>	lock.writeLock().lock();
691	>	lock.writeLock().unlock();
692	>	}});
693	>	Thread t2 = newStartedThread(new CheckedRunnable() {
694	>	public void realRun() {
695	>	lock.writeLock().lock();
696	>	lock.writeLock().unlock();
697	>	}});
698	>
699	>	waitForQueuedThread(lock, t1);
700	>	waitForQueuedThread(lock, t2);
701	>	assertWriteLockedByMoi(lock);
702	>	lock.readLock().lock();
703	>	lock.readLock().unlock();
704	>	assertWriteLockedByMoi(lock);
705	>	lock.writeLock().unlock();
706	>	awaitTermination(t1);
707	>	awaitTermination(t2);
708	>	}
709	>
710	>	/**
711	>	* Write lock succeeds if write locked by current thread even if
712	>	* other threads are waiting for writelock
713	>	*/
714	>	public void testWriteHoldingWriteLock4()      { testWriteHoldingWriteLock4(false); }
715	>	public void testWriteHoldingWriteLock4_fair() { testWriteHoldingWriteLock4(true); }
716	>	public void testWriteHoldingWriteLock4(boolean fair) {
717	>	final PublicReentrantReadWriteLock lock =
718	>	new PublicReentrantReadWriteLock(fair);
719	>	lock.writeLock().lock();
720	>	lock.writeLock().lock();
721	>	lock.writeLock().unlock();
722	>
723	>	Thread t1 = newStartedThread(new CheckedRunnable() {
724	>	public void realRun() {
725	>	lock.writeLock().lock();
726	>	lock.writeLock().unlock();
727	>	}});
728	>	Thread t2 = newStartedThread(new CheckedRunnable() {
729	>	public void realRun() {
730	>	lock.writeLock().lock();
731	>	lock.writeLock().unlock();
732	>	}});
733	>
734	>	waitForQueuedThread(lock, t1);
735	>	waitForQueuedThread(lock, t2);
736	>	assertWriteLockedByMoi(lock);
737	>	assertEquals(1, lock.getWriteHoldCount());
738	>	lock.writeLock().lock();
739	>	assertWriteLockedByMoi(lock);
740	>	assertEquals(2, lock.getWriteHoldCount());
741	>	lock.writeLock().unlock();
742	>	assertWriteLockedByMoi(lock);
743	>	assertEquals(1, lock.getWriteHoldCount());
744	>	lock.writeLock().unlock();
745	>	awaitTermination(t1);
746	>	awaitTermination(t2);
747	>	}
748	>
749	>	/**
750	>	* Read tryLock succeeds if readlocked but not writelocked
751	>	*/
752	>	public void testTryLockWhenReadLocked()      { testTryLockWhenReadLocked(false); }
753	>	public void testTryLockWhenReadLocked_fair() { testTryLockWhenReadLocked(true); }
754	>	public void testTryLockWhenReadLocked(boolean fair) {
755	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
756	>	lock.readLock().lock();
757	>	Thread t = newStartedThread(new CheckedRunnable() {
758	>	public void realRun() {
759	>	assertTrue(lock.readLock().tryLock());
760	>	lock.readLock().unlock();
761	>	}});
762	>
763	>	awaitTermination(t);
764	>	lock.readLock().unlock();
765	>	}
766	>
767	>	/**
768	>	* write tryLock fails when readlocked
769	>	*/
770	>	public void testWriteTryLockWhenReadLocked()      { testWriteTryLockWhenReadLocked(false); }
771	>	public void testWriteTryLockWhenReadLocked_fair() { testWriteTryLockWhenReadLocked(true); }
772	>	public void testWriteTryLockWhenReadLocked(boolean fair) {
773	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
774	>	lock.readLock().lock();
775	>	Thread t = newStartedThread(new CheckedRunnable() {
776	>	public void realRun() {
777	>	assertFalse(lock.writeLock().tryLock());
778	>	}});
779	>
780	>	awaitTermination(t);
781	>	lock.readLock().unlock();
782	>	}
783	>
784	>	/**
785	>	* write timed tryLock times out if locked
786	>	*/
787	>	public void testWriteTryLock_Timeout()      { testWriteTryLock_Timeout(false); }
788	>	public void testWriteTryLock_Timeout_fair() { testWriteTryLock_Timeout(true); }
789	>	public void testWriteTryLock_Timeout(boolean fair) {
790	>	final PublicReentrantReadWriteLock lock =
791	>	new PublicReentrantReadWriteLock(fair);
792	>	final long timeoutMillis = timeoutMillis();
793	>	lock.writeLock().lock();
794	>	Thread t = newStartedThread(new CheckedRunnable() {
795	>	public void realRun() throws InterruptedException {
796	>	long startTime = System.nanoTime();
797	>	assertFalse(lock.writeLock().tryLock(timeoutMillis, MILLISECONDS));
798	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
799	>	}});
800	>
801	>	awaitTermination(t);
802	>	releaseWriteLock(lock);
803	>	}
804	>
805	>	/**
806	>	* read timed tryLock times out if write-locked
807	>	*/
808	>	public void testReadTryLock_Timeout()      { testReadTryLock_Timeout(false); }
809	>	public void testReadTryLock_Timeout_fair() { testReadTryLock_Timeout(true); }
810	>	public void testReadTryLock_Timeout(boolean fair) {
811	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
812	>	lock.writeLock().lock();
813	>	Thread t = newStartedThread(new CheckedRunnable() {
814	>	public void realRun() throws InterruptedException {
815	>	long startTime = System.nanoTime();
816	>	long timeoutMillis = timeoutMillis();
817	>	assertFalse(lock.readLock().tryLock(timeoutMillis, MILLISECONDS));
818	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
819	>	}});
820	>
821	>	awaitTermination(t);
822	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
823	>	lock.writeLock().unlock();
824	>	}
825	>
826	>	/**
827	>	* write lockInterruptibly succeeds if unlocked, else is interruptible
828	>	*/
829	>	public void testWriteLockInterruptibly()      { testWriteLockInterruptibly(false); }
830	>	public void testWriteLockInterruptibly_fair() { testWriteLockInterruptibly(true); }
831	>	public void testWriteLockInterruptibly(boolean fair) {
832	>	final PublicReentrantReadWriteLock lock =
833	>	new PublicReentrantReadWriteLock(fair);
834	>	try {
835		lock.writeLock().lockInterruptibly();
836	<	} catch(Exception e) {
837	<	unexpectedException();
838	<	}
839	<	Thread t = new Thread(new Runnable() {
840	<	public void run() {
841	<	try {
842	<	lock.writeLock().lockInterruptibly();
843	<	threadShouldThrow();
844	<	}
845	<	catch(InterruptedException success) {
846	<	}
395	<	}
396	<	});
397	<	try {
398	<	t.start();
399	<	t.interrupt();
400	<	t.join();
401	<	lock.writeLock().unlock();
402	<	} catch(Exception e){
403	<	unexpectedException();
404	<	}
836	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
837	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
838	>	public void realRun() throws InterruptedException {
839	>	lock.writeLock().lockInterruptibly();
840	>	}});
841	>
842	>	waitForQueuedThread(lock, t);
843	>	t.interrupt();
844	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
845	>	awaitTermination(t);
846	>	releaseWriteLock(lock);
847		}
848
849		/**
850	<	*  read lockInterruptibly succeeds if lock free else is interruptible
850	>	* read lockInterruptibly succeeds if lock free else is interruptible
851		*/
852	<	public void testReadLockInterruptibly() {
853	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
854	<	try {
852	>	public void testReadLockInterruptibly()      { testReadLockInterruptibly(false); }
853	>	public void testReadLockInterruptibly_fair() { testReadLockInterruptibly(true); }
854	>	public void testReadLockInterruptibly(boolean fair) {
855	>	final PublicReentrantReadWriteLock lock =
856	>	new PublicReentrantReadWriteLock(fair);
857	>	try {
858	>	lock.readLock().lockInterruptibly();
859	>	lock.readLock().unlock();
860		lock.writeLock().lockInterruptibly();
861	<	} catch(Exception e) {
862	<	unexpectedException();
863	<	}
864	<	Thread t = new Thread(new Runnable() {
865	<	public void run() {
866	<	try {
867	<	lock.readLock().lockInterruptibly();
868	<	threadShouldThrow();
869	<	}
870	<	catch(InterruptedException success) {
424	<	}
425	<	}
426	<	});
427	<	try {
428	<	t.start();
429	<	t.interrupt();
430	<	t.join();
431	<	lock.writeLock().unlock();
432	<	} catch(Exception e){
433	<	unexpectedException();
434	<	}
861	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
862	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
863	>	public void realRun() throws InterruptedException {
864	>	lock.readLock().lockInterruptibly();
865	>	}});
866	>
867	>	waitForQueuedThread(lock, t);
868	>	t.interrupt();
869	>	awaitTermination(t);
870	>	releaseWriteLock(lock);
871		}
872
873		/**
874		* Calling await without holding lock throws IllegalMonitorStateException
875		*/
876	<	public void testAwait_IllegalMonitor() {
877	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
876	>	public void testAwait_IMSE()      { testAwait_IMSE(false); }
877	>	public void testAwait_IMSE_fair() { testAwait_IMSE(true); }
878	>	public void testAwait_IMSE(boolean fair) {
879	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
880		final Condition c = lock.writeLock().newCondition();
881	<	try {
882	<	c.await();
883	<	shouldThrow();
884	<	}
885	<	catch (IllegalMonitorStateException success) {
886	<	}
887	<	catch (Exception ex) {
888	<	shouldThrow();
881	>	for (AwaitMethod awaitMethod : AwaitMethod.values()) {
882	>	long startTime = System.nanoTime();
883	>	try {
884	>	await(c, awaitMethod);
885	>	shouldThrow();
886	>	} catch (IllegalMonitorStateException success) {
887	>	} catch (InterruptedException fail) {
888	>	threadUnexpectedException(fail);
889	>	}
890	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
891		}
892		}
893
894		/**
895		* Calling signal without holding lock throws IllegalMonitorStateException
896		*/
897	<	public void testSignal_IllegalMonitor() {
898	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
897	>	public void testSignal_IMSE()      { testSignal_IMSE(false); }
898	>	public void testSignal_IMSE_fair() { testSignal_IMSE(true); }
899	>	public void testSignal_IMSE(boolean fair) {
900	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
901		final Condition c = lock.writeLock().newCondition();
902		try {
903		c.signal();
904		shouldThrow();
905	<	}
464	<	catch (IllegalMonitorStateException success) {
465	<	}
466	<	catch (Exception ex) {
467	<	unexpectedException();
468	<	}
905	>	} catch (IllegalMonitorStateException success) {}
906		}
907
908		/**
909	<	* awaitNanos without a signal times out
909	>	* Calling signalAll without holding lock throws IllegalMonitorStateException
910		*/
911	<	public void testAwaitNanos_Timeout() {
912	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
911	>	public void testSignalAll_IMSE()      { testSignalAll_IMSE(false); }
912	>	public void testSignalAll_IMSE_fair() { testSignalAll_IMSE(true); }
913	>	public void testSignalAll_IMSE(boolean fair) {
914	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
915		final Condition c = lock.writeLock().newCondition();
916		try {
917	<	lock.writeLock().lock();
918	<	long t = c.awaitNanos(100);
919	<	assertTrue(t <= 0);
481	<	lock.writeLock().unlock();
482	<	}
483	<	catch (Exception ex) {
484	<	unexpectedException();
485	<	}
917	>	c.signalAll();
918	>	shouldThrow();
919	>	} catch (IllegalMonitorStateException success) {}
920		}
921
488	–
922		/**
923	<	*  timed await without a signal times out
923	>	* awaitNanos without a signal times out
924		*/
925	<	public void testAwait_Timeout() {
926	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
925	>	public void testAwaitNanos_Timeout()      { testAwaitNanos_Timeout(false); }
926	>	public void testAwaitNanos_Timeout_fair() { testAwaitNanos_Timeout(true); }
927	>	public void testAwaitNanos_Timeout(boolean fair) {
928	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
929		final Condition c = lock.writeLock().newCondition();
930	+	final long timeoutMillis = timeoutMillis();
931	+	lock.writeLock().lock();
932	+	final long startTime = System.nanoTime();
933	+	final long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis);
934		try {
935	<	lock.writeLock().lock();
936	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
937	<	lock.writeLock().unlock();
938	<	}
939	<	catch (Exception ex) {
940	<	unexpectedException();
941	<	}
935	>	long nanosRemaining = c.awaitNanos(timeoutNanos);
936	>	assertTrue(nanosRemaining <= 0);
937	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
938	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
939	>	lock.writeLock().unlock();
940	>	}
941	>
942	>	/**
943	>	* timed await without a signal times out
944	>	*/
945	>	public void testAwait_Timeout()      { testAwait_Timeout(false); }
946	>	public void testAwait_Timeout_fair() { testAwait_Timeout(true); }
947	>	public void testAwait_Timeout(boolean fair) {
948	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
949	>	final Condition c = lock.writeLock().newCondition();
950	>	final long timeoutMillis = timeoutMillis();
951	>	lock.writeLock().lock();
952	>	final long startTime = System.nanoTime();
953	>	try {
954	>	assertFalse(c.await(timeoutMillis, MILLISECONDS));
955	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
956	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
957	>	lock.writeLock().unlock();
958		}
959
960		/**
961		* awaitUntil without a signal times out
962		*/
963	<	public void testAwaitUntil_Timeout() {
964	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
963	>	public void testAwaitUntil_Timeout()      { testAwaitUntil_Timeout(false); }
964	>	public void testAwaitUntil_Timeout_fair() { testAwaitUntil_Timeout(true); }
965	>	public void testAwaitUntil_Timeout(boolean fair) {
966	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
967		final Condition c = lock.writeLock().newCondition();
968	<	try {
969	<	lock.writeLock().lock();
970	<	java.util.Date d = new java.util.Date();
971	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
972	<	lock.writeLock().unlock();
973	<	}
974	<	catch (Exception ex) {
975	<	unexpectedException();
976	<	}
968	>	lock.writeLock().lock();
969	>	// We shouldn't assume that nanoTime and currentTimeMillis
970	>	// use the same time source, so don't use nanoTime here.
971	>	final java.util.Date delayedDate = delayedDate(timeoutMillis());
972	>	try {
973	>	assertFalse(c.awaitUntil(delayedDate));
974	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
975	>	assertTrue(new java.util.Date().getTime() >= delayedDate.getTime());
976	>	lock.writeLock().unlock();
977		}
978
979		/**
980		* await returns when signalled
981		*/
982	<	public void testAwait() {
983	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
982	>	public void testAwait()      { testAwait(false); }
983	>	public void testAwait_fair() { testAwait(true); }
984	>	public void testAwait(boolean fair) {
985	>	final PublicReentrantReadWriteLock lock =
986	>	new PublicReentrantReadWriteLock(fair);
987	>	final Condition c = lock.writeLock().newCondition();
988	>	final CountDownLatch locked = new CountDownLatch(1);
989	>	Thread t = newStartedThread(new CheckedRunnable() {
990	>	public void realRun() throws InterruptedException {
991	>	lock.writeLock().lock();
992	>	locked.countDown();
993	>	c.await();
994	>	lock.writeLock().unlock();
995	>	}});
996	>
997	>	await(locked);
998	>	lock.writeLock().lock();
999	>	assertHasWaiters(lock, c, t);
1000	>	c.signal();
1001	>	assertHasNoWaiters(lock, c);
1002	>	assertTrue(t.isAlive());
1003	>	lock.writeLock().unlock();
1004	>	awaitTermination(t);
1005	>	}
1006	>
1007	>	/**
1008	>	* awaitUninterruptibly is uninterruptible
1009	>	*/
1010	>	public void testAwaitUninterruptibly()      { testAwaitUninterruptibly(false); }
1011	>	public void testAwaitUninterruptibly_fair() { testAwaitUninterruptibly(true); }
1012	>	public void testAwaitUninterruptibly(boolean fair) {
1013	>	final Lock lock = new ReentrantReadWriteLock(fair).writeLock();
1014	>	final Condition condition = lock.newCondition();
1015	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(2);
1016	>
1017	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1018	>	public void realRun() {
1019	>	// Interrupt before awaitUninterruptibly
1020	>	lock.lock();
1021	>	pleaseInterrupt.countDown();
1022	>	Thread.currentThread().interrupt();
1023	>	condition.awaitUninterruptibly();
1024	>	assertTrue(Thread.interrupted());
1025	>	lock.unlock();
1026	>	}});
1027	>
1028	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1029	>	public void realRun() {
1030	>	// Interrupt during awaitUninterruptibly
1031	>	lock.lock();
1032	>	pleaseInterrupt.countDown();
1033	>	condition.awaitUninterruptibly();
1034	>	assertTrue(Thread.interrupted());
1035	>	lock.unlock();
1036	>	}});
1037	>
1038	>	await(pleaseInterrupt);
1039	>	t2.interrupt();
1040	>	lock.lock();
1041	>	lock.unlock();
1042	>	assertThreadBlocks(t1, Thread.State.WAITING);
1043	>	assertThreadBlocks(t2, Thread.State.WAITING);
1044	>
1045	>	lock.lock();
1046	>	condition.signalAll();
1047	>	lock.unlock();
1048	>
1049	>	awaitTermination(t1);
1050	>	awaitTermination(t2);
1051	>	}
1052	>
1053	>	/**
1054	>	* await/awaitNanos/awaitUntil is interruptible
1055	>	*/
1056	>	public void testInterruptible_await()           { testInterruptible(false, AwaitMethod.await); }
1057	>	public void testInterruptible_await_fair()      { testInterruptible(true,  AwaitMethod.await); }
1058	>	public void testInterruptible_awaitTimed()      { testInterruptible(false, AwaitMethod.awaitTimed); }
1059	>	public void testInterruptible_awaitTimed_fair() { testInterruptible(true,  AwaitMethod.awaitTimed); }
1060	>	public void testInterruptible_awaitNanos()      { testInterruptible(false, AwaitMethod.awaitNanos); }
1061	>	public void testInterruptible_awaitNanos_fair() { testInterruptible(true,  AwaitMethod.awaitNanos); }
1062	>	public void testInterruptible_awaitUntil()      { testInterruptible(false, AwaitMethod.awaitUntil); }
1063	>	public void testInterruptible_awaitUntil_fair() { testInterruptible(true,  AwaitMethod.awaitUntil); }
1064	>	public void testInterruptible(boolean fair, final AwaitMethod awaitMethod) {
1065	>	final PublicReentrantReadWriteLock lock =
1066	>	new PublicReentrantReadWriteLock(fair);
1067	>	final Condition c = lock.writeLock().newCondition();
1068	>	final CountDownLatch locked = new CountDownLatch(1);
1069	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1070	>	public void realRun() throws InterruptedException {
1071	>	lock.writeLock().lock();
1072	>	assertWriteLockedByMoi(lock);
1073	>	assertHasNoWaiters(lock, c);
1074	>	locked.countDown();
1075	>	try {
1076	>	await(c, awaitMethod);
1077	>	} finally {
1078	>	assertWriteLockedByMoi(lock);
1079	>	assertHasNoWaiters(lock, c);
1080	>	lock.writeLock().unlock();
1081	>	assertFalse(Thread.interrupted());
1082	>	}
1083	>	}});
1084	>
1085	>	await(locked);
1086	>	assertHasWaiters(lock, c, t);
1087	>	t.interrupt();
1088	>	awaitTermination(t);
1089	>	assertNotWriteLocked(lock);
1090	>	}
1091	>
1092	>	/**
1093	>	* signalAll wakes up all threads
1094	>	*/
1095	>	public void testSignalAll_await()           { testSignalAll(false, AwaitMethod.await); }
1096	>	public void testSignalAll_await_fair()      { testSignalAll(true,  AwaitMethod.await); }
1097	>	public void testSignalAll_awaitTimed()      { testSignalAll(false, AwaitMethod.awaitTimed); }
1098	>	public void testSignalAll_awaitTimed_fair() { testSignalAll(true,  AwaitMethod.awaitTimed); }
1099	>	public void testSignalAll_awaitNanos()      { testSignalAll(false, AwaitMethod.awaitNanos); }
1100	>	public void testSignalAll_awaitNanos_fair() { testSignalAll(true,  AwaitMethod.awaitNanos); }
1101	>	public void testSignalAll_awaitUntil()      { testSignalAll(false, AwaitMethod.awaitUntil); }
1102	>	public void testSignalAll_awaitUntil_fair() { testSignalAll(true,  AwaitMethod.awaitUntil); }
1103	>	public void testSignalAll(boolean fair, final AwaitMethod awaitMethod) {
1104	>	final PublicReentrantReadWriteLock lock =
1105	>	new PublicReentrantReadWriteLock(fair);
1106	>	final Condition c = lock.writeLock().newCondition();
1107	>	final CountDownLatch locked = new CountDownLatch(2);
1108	>	final Lock writeLock = lock.writeLock();
1109	>	class Awaiter extends CheckedRunnable {
1110	>	public void realRun() throws InterruptedException {
1111	>	writeLock.lock();
1112	>	locked.countDown();
1113	>	await(c, awaitMethod);
1114	>	writeLock.unlock();
1115	>	}
1116	>	}
1117	>
1118	>	Thread t1 = newStartedThread(new Awaiter());
1119	>	Thread t2 = newStartedThread(new Awaiter());
1120	>
1121	>	await(locked);
1122	>	writeLock.lock();
1123	>	assertHasWaiters(lock, c, t1, t2);
1124	>	c.signalAll();
1125	>	assertHasNoWaiters(lock, c);
1126	>	writeLock.unlock();
1127	>	awaitTermination(t1);
1128	>	awaitTermination(t2);
1129	>	}
1130	>
1131	>	/**
1132	>	* signal wakes up waiting threads in FIFO order
1133	>	*/
1134	>	public void testSignalWakesFifo()      { testSignalWakesFifo(false); }
1135	>	public void testSignalWakesFifo_fair() { testSignalWakesFifo(true); }
1136	>	public void testSignalWakesFifo(boolean fair) {
1137	>	final PublicReentrantReadWriteLock lock =
1138	>	new PublicReentrantReadWriteLock(fair);
1139	>	final Condition c = lock.writeLock().newCondition();
1140	>	final CountDownLatch locked1 = new CountDownLatch(1);
1141	>	final CountDownLatch locked2 = new CountDownLatch(1);
1142	>	final Lock writeLock = lock.writeLock();
1143	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1144	>	public void realRun() throws InterruptedException {
1145	>	writeLock.lock();
1146	>	locked1.countDown();
1147	>	c.await();
1148	>	writeLock.unlock();
1149	>	}});
1150	>
1151	>	await(locked1);
1152	>
1153	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1154	>	public void realRun() throws InterruptedException {
1155	>	writeLock.lock();
1156	>	locked2.countDown();
1157	>	c.await();
1158	>	writeLock.unlock();
1159	>	}});
1160	>
1161	>	await(locked2);
1162	>
1163	>	writeLock.lock();
1164	>	assertHasWaiters(lock, c, t1, t2);
1165	>	assertFalse(lock.hasQueuedThreads());
1166	>	c.signal();
1167	>	assertHasWaiters(lock, c, t2);
1168	>	assertTrue(lock.hasQueuedThread(t1));
1169	>	assertFalse(lock.hasQueuedThread(t2));
1170	>	c.signal();
1171	>	assertHasNoWaiters(lock, c);
1172	>	assertTrue(lock.hasQueuedThread(t1));
1173	>	assertTrue(lock.hasQueuedThread(t2));
1174	>	writeLock.unlock();
1175	>	awaitTermination(t1);
1176	>	awaitTermination(t2);
1177	>	}
1178	>
1179	>	/**
1180	>	* await after multiple reentrant locking preserves lock count
1181	>	*/
1182	>	public void testAwaitLockCount()      { testAwaitLockCount(false); }
1183	>	public void testAwaitLockCount_fair() { testAwaitLockCount(true); }
1184	>	public void testAwaitLockCount(boolean fair) {
1185	>	final PublicReentrantReadWriteLock lock =
1186	>	new PublicReentrantReadWriteLock(fair);
1187		final Condition c = lock.writeLock().newCondition();
1188	<	Thread t = new Thread(new Runnable() {
1189	<	public void run() {
1190	<	try {
1191	<	lock.writeLock().lock();
1192	<	c.await();
1193	<	lock.writeLock().unlock();
1194	<	}
1195	<	catch(InterruptedException e) {
1196	<	threadUnexpectedException();
1197	<	}
1198	<	}
1199	<	});
1188	>	final CountDownLatch locked = new CountDownLatch(2);
1189	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1190	>	public void realRun() throws InterruptedException {
1191	>	lock.writeLock().lock();
1192	>	assertWriteLockedByMoi(lock);
1193	>	assertEquals(1, lock.writeLock().getHoldCount());
1194	>	locked.countDown();
1195	>	c.await();
1196	>	assertWriteLockedByMoi(lock);
1197	>	assertEquals(1, lock.writeLock().getHoldCount());
1198	>	lock.writeLock().unlock();
1199	>	}});
1200	>
1201	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1202	>	public void realRun() throws InterruptedException {
1203	>	lock.writeLock().lock();
1204	>	lock.writeLock().lock();
1205	>	assertWriteLockedByMoi(lock);
1206	>	assertEquals(2, lock.writeLock().getHoldCount());
1207	>	locked.countDown();
1208	>	c.await();
1209	>	assertWriteLockedByMoi(lock);
1210	>	assertEquals(2, lock.writeLock().getHoldCount());
1211	>	lock.writeLock().unlock();
1212	>	lock.writeLock().unlock();
1213	>	}});
1214	>
1215	>	await(locked);
1216	>	lock.writeLock().lock();
1217	>	assertHasWaiters(lock, c, t1, t2);
1218	>	c.signalAll();
1219	>	assertHasNoWaiters(lock, c);
1220	>	lock.writeLock().unlock();
1221	>	awaitTermination(t1);
1222	>	awaitTermination(t2);
1223	>	}
1224	>
1225	>	/**
1226	>	* A serialized lock deserializes as unlocked
1227	>	*/
1228	>	public void testSerialization()      { testSerialization(false); }
1229	>	public void testSerialization_fair() { testSerialization(true); }
1230	>	public void testSerialization(boolean fair) {
1231	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1232	>	lock.writeLock().lock();
1233	>	lock.readLock().lock();
1234	>
1235	>	ReentrantReadWriteLock clone = serialClone(lock);
1236	>	assertEquals(lock.isFair(), clone.isFair());
1237	>	assertTrue(lock.isWriteLocked());
1238	>	assertFalse(clone.isWriteLocked());
1239	>	assertEquals(1, lock.getReadLockCount());
1240	>	assertEquals(0, clone.getReadLockCount());
1241	>	clone.writeLock().lock();
1242	>	clone.readLock().lock();
1243	>	assertTrue(clone.isWriteLocked());
1244	>	assertEquals(1, clone.getReadLockCount());
1245	>	clone.readLock().unlock();
1246	>	clone.writeLock().unlock();
1247	>	assertFalse(clone.isWriteLocked());
1248	>	assertEquals(1, lock.getReadLockCount());
1249	>	assertEquals(0, clone.getReadLockCount());
1250	>	}
1251	>
1252	>	/**
1253	>	* hasQueuedThreads reports whether there are waiting threads
1254	>	*/
1255	>	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
1256	>	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
1257	>	public void testHasQueuedThreads(boolean fair) {
1258	>	final PublicReentrantReadWriteLock lock =
1259	>	new PublicReentrantReadWriteLock(fair);
1260	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1261	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1262	>	assertFalse(lock.hasQueuedThreads());
1263	>	lock.writeLock().lock();
1264	>	assertFalse(lock.hasQueuedThreads());
1265	>	t1.start();
1266	>	waitForQueuedThread(lock, t1);
1267	>	assertTrue(lock.hasQueuedThreads());
1268	>	t2.start();
1269	>	waitForQueuedThread(lock, t2);
1270	>	assertTrue(lock.hasQueuedThreads());
1271	>	t1.interrupt();
1272	>	awaitTermination(t1);
1273	>	assertTrue(lock.hasQueuedThreads());
1274	>	lock.writeLock().unlock();
1275	>	awaitTermination(t2);
1276	>	assertFalse(lock.hasQueuedThreads());
1277	>	}
1278
1279	+	/**
1280	+	* hasQueuedThread(null) throws NPE
1281	+	*/
1282	+	public void testHasQueuedThreadNPE()      { testHasQueuedThreadNPE(false); }
1283	+	public void testHasQueuedThreadNPE_fair() { testHasQueuedThreadNPE(true); }
1284	+	public void testHasQueuedThreadNPE(boolean fair) {
1285	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1286		try {
1287	<	t.start();
1288	<	Thread.sleep(SHORT_DELAY_MS);
1289	<	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();
552	<	}
1287	>	lock.hasQueuedThread(null);
1288	>	shouldThrow();
1289	>	} catch (NullPointerException success) {}
1290		}
1291
1292		/**
1293	<	* awaitUninterruptibly doesn't abort on interrupt
1293	>	* hasQueuedThread reports whether a thread is queued
1294		*/
1295	<	public void testAwaitUninterruptibly() {
1296	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1297	<	final Condition c = lock.writeLock().newCondition();
1298	<	Thread t = new Thread(new Runnable() {
1299	<	public void run() {
1300	<	lock.writeLock().lock();
1301	<	c.awaitUninterruptibly();
1302	<	lock.writeLock().unlock();
1303	<	}
1304	<	});
1295	>	public void testHasQueuedThread()      { testHasQueuedThread(false); }
1296	>	public void testHasQueuedThread_fair() { testHasQueuedThread(true); }
1297	>	public void testHasQueuedThread(boolean fair) {
1298	>	final PublicReentrantReadWriteLock lock =
1299	>	new PublicReentrantReadWriteLock(fair);
1300	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1301	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1302	>	assertFalse(lock.hasQueuedThread(t1));
1303	>	assertFalse(lock.hasQueuedThread(t2));
1304	>	lock.writeLock().lock();
1305	>	t1.start();
1306	>	waitForQueuedThread(lock, t1);
1307	>	assertTrue(lock.hasQueuedThread(t1));
1308	>	assertFalse(lock.hasQueuedThread(t2));
1309	>	t2.start();
1310	>	waitForQueuedThread(lock, t2);
1311	>	assertTrue(lock.hasQueuedThread(t1));
1312	>	assertTrue(lock.hasQueuedThread(t2));
1313	>	t1.interrupt();
1314	>	awaitTermination(t1);
1315	>	assertFalse(lock.hasQueuedThread(t1));
1316	>	assertTrue(lock.hasQueuedThread(t2));
1317	>	lock.writeLock().unlock();
1318	>	awaitTermination(t2);
1319	>	assertFalse(lock.hasQueuedThread(t1));
1320	>	assertFalse(lock.hasQueuedThread(t2));
1321	>	}
1322	>
1323	>	/**
1324	>	* getQueueLength reports number of waiting threads
1325	>	*/
1326	>	public void testGetQueueLength()      { testGetQueueLength(false); }
1327	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
1328	>	public void testGetQueueLength(boolean fair) {
1329	>	final PublicReentrantReadWriteLock lock =
1330	>	new PublicReentrantReadWriteLock(fair);
1331	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1332	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1333	>	assertEquals(0, lock.getQueueLength());
1334	>	lock.writeLock().lock();
1335	>	t1.start();
1336	>	waitForQueuedThread(lock, t1);
1337	>	assertEquals(1, lock.getQueueLength());
1338	>	t2.start();
1339	>	waitForQueuedThread(lock, t2);
1340	>	assertEquals(2, lock.getQueueLength());
1341	>	t1.interrupt();
1342	>	awaitTermination(t1);
1343	>	assertEquals(1, lock.getQueueLength());
1344	>	lock.writeLock().unlock();
1345	>	awaitTermination(t2);
1346	>	assertEquals(0, lock.getQueueLength());
1347	>	}
1348	>
1349	>	/**
1350	>	* getQueuedThreads includes waiting threads
1351	>	*/
1352	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
1353	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
1354	>	public void testGetQueuedThreads(boolean fair) {
1355	>	final PublicReentrantReadWriteLock lock =
1356	>	new PublicReentrantReadWriteLock(fair);
1357	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1358	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1359	>	assertTrue(lock.getQueuedThreads().isEmpty());
1360	>	lock.writeLock().lock();
1361	>	assertTrue(lock.getQueuedThreads().isEmpty());
1362	>	t1.start();
1363	>	waitForQueuedThread(lock, t1);
1364	>	assertEquals(1, lock.getQueuedThreads().size());
1365	>	assertTrue(lock.getQueuedThreads().contains(t1));
1366	>	t2.start();
1367	>	waitForQueuedThread(lock, t2);
1368	>	assertEquals(2, lock.getQueuedThreads().size());
1369	>	assertTrue(lock.getQueuedThreads().contains(t1));
1370	>	assertTrue(lock.getQueuedThreads().contains(t2));
1371	>	t1.interrupt();
1372	>	awaitTermination(t1);
1373	>	assertFalse(lock.getQueuedThreads().contains(t1));
1374	>	assertTrue(lock.getQueuedThreads().contains(t2));
1375	>	assertEquals(1, lock.getQueuedThreads().size());
1376	>	lock.writeLock().unlock();
1377	>	awaitTermination(t2);
1378	>	assertTrue(lock.getQueuedThreads().isEmpty());
1379	>	}
1380	>
1381	>	/**
1382	>	* hasWaiters throws NPE if null
1383	>	*/
1384	>	public void testHasWaitersNPE()      { testHasWaitersNPE(false); }
1385	>	public void testHasWaitersNPE_fair() { testHasWaitersNPE(true); }
1386	>	public void testHasWaitersNPE(boolean fair) {
1387	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1388	>	try {
1389	>	lock.hasWaiters(null);
1390	>	shouldThrow();
1391	>	} catch (NullPointerException success) {}
1392	>	}
1393
1394	+	/**
1395	+	* getWaitQueueLength throws NPE if null
1396	+	*/
1397	+	public void testGetWaitQueueLengthNPE()      { testGetWaitQueueLengthNPE(false); }
1398	+	public void testGetWaitQueueLengthNPE_fair() { testGetWaitQueueLengthNPE(true); }
1399	+	public void testGetWaitQueueLengthNPE(boolean fair) {
1400	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1401		try {
1402	<	t.start();
1403	<	Thread.sleep(SHORT_DELAY_MS);
1404	<	t.interrupt();
573	<	lock.writeLock().lock();
574	<	c.signal();
575	<	lock.writeLock().unlock();
576	<	assert(t.isInterrupted());
577	<	t.join(SHORT_DELAY_MS);
578	<	assertFalse(t.isAlive());
579	<	}
580	<	catch (Exception ex) {
581	<	unexpectedException();
582	<	}
1402	>	lock.getWaitQueueLength(null);
1403	>	shouldThrow();
1404	>	} catch (NullPointerException success) {}
1405		}
1406
1407		/**
1408	<	* await is interruptible
1408	>	* getWaitingThreads throws NPE if null
1409		*/
1410	<	public void testAwait_Interrupt() {
1411	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1412	<	final Condition c = lock.writeLock().newCondition();
1413	<	Thread t = new Thread(new Runnable() {
1414	<	public void run() {
1415	<	try {
1416	<	lock.writeLock().lock();
1417	<	c.await();
1418	<	lock.writeLock().unlock();
597	<	threadShouldThrow();
598	<	}
599	<	catch(InterruptedException success) {
600	<	}
601	<	}
602	<	});
1410	>	public void testGetWaitingThreadsNPE()      { testGetWaitingThreadsNPE(false); }
1411	>	public void testGetWaitingThreadsNPE_fair() { testGetWaitingThreadsNPE(true); }
1412	>	public void testGetWaitingThreadsNPE(boolean fair) {
1413	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(fair);
1414	>	try {
1415	>	lock.getWaitingThreads(null);
1416	>	shouldThrow();
1417	>	} catch (NullPointerException success) {}
1418	>	}
1419
1420	+	/**
1421	+	* hasWaiters throws IllegalArgumentException if not owned
1422	+	*/
1423	+	public void testHasWaitersIAE()      { testHasWaitersIAE(false); }
1424	+	public void testHasWaitersIAE_fair() { testHasWaitersIAE(true); }
1425	+	public void testHasWaitersIAE(boolean fair) {
1426	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1427	+	final Condition c = lock.writeLock().newCondition();
1428	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(fair);
1429		try {
1430	<	t.start();
1431	<	Thread.sleep(SHORT_DELAY_MS);
1432	<	t.interrupt();
608	<	t.join(SHORT_DELAY_MS);
609	<	assertFalse(t.isAlive());
610	<	}
611	<	catch (Exception ex) {
612	<	unexpectedException();
613	<	}
1430	>	lock2.hasWaiters(c);
1431	>	shouldThrow();
1432	>	} catch (IllegalArgumentException success) {}
1433		}
1434
1435		/**
1436	<	* awaitNanos is interruptible
1436	>	* hasWaiters throws IllegalMonitorStateException if not locked
1437		*/
1438	<	public void testAwaitNanos_Interrupt() {
1439	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1438	>	public void testHasWaitersIMSE()      { testHasWaitersIMSE(false); }
1439	>	public void testHasWaitersIMSE_fair() { testHasWaitersIMSE(true); }
1440	>	public void testHasWaitersIMSE(boolean fair) {
1441	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1442		final Condition c = lock.writeLock().newCondition();
1443	<	Thread t = new Thread(new Runnable() {
1444	<	public void run() {
1445	<	try {
1446	<	lock.writeLock().lock();
1447	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
627	<	lock.writeLock().unlock();
628	<	threadShouldThrow();
629	<	}
630	<	catch(InterruptedException success) {
631	<	}
632	<	}
633	<	});
1443	>	try {
1444	>	lock.hasWaiters(c);
1445	>	shouldThrow();
1446	>	} catch (IllegalMonitorStateException success) {}
1447	>	}
1448
1449	+	/**
1450	+	* getWaitQueueLength throws IllegalArgumentException if not owned
1451	+	*/
1452	+	public void testGetWaitQueueLengthIAE()      { testGetWaitQueueLengthIAE(false); }
1453	+	public void testGetWaitQueueLengthIAE_fair() { testGetWaitQueueLengthIAE(true); }
1454	+	public void testGetWaitQueueLengthIAE(boolean fair) {
1455	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1456	+	final Condition c = lock.writeLock().newCondition();
1457	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(fair);
1458		try {
1459	<	t.start();
1460	<	Thread.sleep(SHORT_DELAY_MS);
1461	<	t.interrupt();
639	<	t.join(SHORT_DELAY_MS);
640	<	assertFalse(t.isAlive());
641	<	}
642	<	catch (Exception ex) {
643	<	unexpectedException();
644	<	}
1459	>	lock2.getWaitQueueLength(c);
1460	>	shouldThrow();
1461	>	} catch (IllegalArgumentException success) {}
1462		}
1463
1464		/**
1465	<	* awaitUntil is interruptible
1465	>	* getWaitQueueLength throws IllegalMonitorStateException if not locked
1466		*/
1467	<	public void testAwaitUntil_Interrupt() {
1468	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1467	>	public void testGetWaitQueueLengthIMSE()      { testGetWaitQueueLengthIMSE(false); }
1468	>	public void testGetWaitQueueLengthIMSE_fair() { testGetWaitQueueLengthIMSE(true); }
1469	>	public void testGetWaitQueueLengthIMSE(boolean fair) {
1470	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1471		final Condition c = lock.writeLock().newCondition();
1472	<	Thread t = new Thread(new Runnable() {
1473	<	public void run() {
1474	<	try {
1475	<	lock.writeLock().lock();
1476	<	java.util.Date d = new java.util.Date();
658	<	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
659	<	lock.writeLock().unlock();
660	<	threadShouldThrow();
661	<	}
662	<	catch(InterruptedException success) {
663	<	}
664	<	}
665	<	});
1472	>	try {
1473	>	lock.getWaitQueueLength(c);
1474	>	shouldThrow();
1475	>	} catch (IllegalMonitorStateException success) {}
1476	>	}
1477
1478	+	/**
1479	+	* getWaitingThreads throws IllegalArgumentException if not owned
1480	+	*/
1481	+	public void testGetWaitingThreadsIAE()      { testGetWaitingThreadsIAE(false); }
1482	+	public void testGetWaitingThreadsIAE_fair() { testGetWaitingThreadsIAE(true); }
1483	+	public void testGetWaitingThreadsIAE(boolean fair) {
1484	+	final PublicReentrantReadWriteLock lock =
1485	+	new PublicReentrantReadWriteLock(fair);
1486	+	final Condition c = lock.writeLock().newCondition();
1487	+	final PublicReentrantReadWriteLock lock2 =
1488	+	new PublicReentrantReadWriteLock(fair);
1489		try {
1490	<	t.start();
1491	<	Thread.sleep(SHORT_DELAY_MS);
1492	<	t.interrupt();
671	<	t.join(SHORT_DELAY_MS);
672	<	assertFalse(t.isAlive());
673	<	}
674	<	catch (Exception ex) {
675	<	unexpectedException();
676	<	}
1490	>	lock2.getWaitingThreads(c);
1491	>	shouldThrow();
1492	>	} catch (IllegalArgumentException success) {}
1493		}
1494
1495		/**
1496	<	* signalAll wakes up all threads
1496	>	* getWaitingThreads throws IllegalMonitorStateException if not locked
1497		*/
1498	<	public void testSignalAll() {
1499	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1498	>	public void testGetWaitingThreadsIMSE()      { testGetWaitingThreadsIMSE(false); }
1499	>	public void testGetWaitingThreadsIMSE_fair() { testGetWaitingThreadsIMSE(true); }
1500	>	public void testGetWaitingThreadsIMSE(boolean fair) {
1501	>	final PublicReentrantReadWriteLock lock =
1502	>	new PublicReentrantReadWriteLock(fair);
1503		final Condition c = lock.writeLock().newCondition();
1504	<	Thread t1 = new Thread(new Runnable() {
1505	<	public void run() {
1506	<	try {
1507	<	lock.writeLock().lock();
689	<	c.await();
690	<	lock.writeLock().unlock();
691	<	}
692	<	catch(InterruptedException e) {
693	<	threadUnexpectedException();
694	<	}
695	<	}
696	<	});
697	<
698	<	Thread t2 = new Thread(new Runnable() {
699	<	public void run() {
700	<	try {
701	<	lock.writeLock().lock();
702	<	c.await();
703	<	lock.writeLock().unlock();
704	<	}
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	<	}
1504	>	try {
1505	>	lock.getWaitingThreads(c);
1506	>	shouldThrow();
1507	>	} catch (IllegalMonitorStateException success) {}
1508		}
1509
1510		/**
1511	<	* A serialized lock deserializes as unlocked
1511	>	* hasWaiters returns true when a thread is waiting, else false
1512		*/
1513	<	public void testSerialization() {
1514	<	ReentrantReadWriteLock l = new ReentrantReadWriteLock();
1515	<	l.readLock().lock();
1516	<	l.readLock().unlock();
1517	<
1518	<	try {
1519	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1520	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1521	<	out.writeObject(l);
1522	<	out.close();
1523	<
1524	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1525	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1526	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1527	<	r.readLock().lock();
1528	<	r.readLock().unlock();
1529	<	} catch(Exception e){
1530	<	e.printStackTrace();
1531	<	unexpectedException();
1532	<	}
1513	>	public void testHasWaiters()      { testHasWaiters(false); }
1514	>	public void testHasWaiters_fair() { testHasWaiters(true); }
1515	>	public void testHasWaiters(boolean fair) {
1516	>	final PublicReentrantReadWriteLock lock =
1517	>	new PublicReentrantReadWriteLock(fair);
1518	>	final Condition c = lock.writeLock().newCondition();
1519	>	final CountDownLatch locked = new CountDownLatch(1);
1520	>	Thread t = newStartedThread(new CheckedRunnable() {
1521	>	public void realRun() throws InterruptedException {
1522	>	lock.writeLock().lock();
1523	>	assertHasNoWaiters(lock, c);
1524	>	assertFalse(lock.hasWaiters(c));
1525	>	locked.countDown();
1526	>	c.await();
1527	>	assertHasNoWaiters(lock, c);
1528	>	assertFalse(lock.hasWaiters(c));
1529	>	lock.writeLock().unlock();
1530	>	}});
1531	>
1532	>	await(locked);
1533	>	lock.writeLock().lock();
1534	>	assertHasWaiters(lock, c, t);
1535	>	assertTrue(lock.hasWaiters(c));
1536	>	c.signal();
1537	>	assertHasNoWaiters(lock, c);
1538	>	assertFalse(lock.hasWaiters(c));
1539	>	lock.writeLock().unlock();
1540	>	awaitTermination(t);
1541	>	assertHasNoWaiters(lock, c);
1542		}
1543
1544	+	/**
1545	+	* getWaitQueueLength returns number of waiting threads
1546	+	*/
1547	+	public void testGetWaitQueueLength()      { testGetWaitQueueLength(false); }
1548	+	public void testGetWaitQueueLength_fair() { testGetWaitQueueLength(true); }
1549	+	public void testGetWaitQueueLength(boolean fair) {
1550	+	final PublicReentrantReadWriteLock lock =
1551	+	new PublicReentrantReadWriteLock(fair);
1552	+	final Condition c = lock.writeLock().newCondition();
1553	+	final CountDownLatch locked = new CountDownLatch(1);
1554	+	Thread t = newStartedThread(new CheckedRunnable() {
1555	+	public void realRun() throws InterruptedException {
1556	+	lock.writeLock().lock();
1557	+	assertEquals(0, lock.getWaitQueueLength(c));
1558	+	locked.countDown();
1559	+	c.await();
1560	+	lock.writeLock().unlock();
1561	+	}});
1562	+
1563	+	await(locked);
1564	+	lock.writeLock().lock();
1565	+	assertHasWaiters(lock, c, t);
1566	+	assertEquals(1, lock.getWaitQueueLength(c));
1567	+	c.signal();
1568	+	assertHasNoWaiters(lock, c);
1569	+	assertEquals(0, lock.getWaitQueueLength(c));
1570	+	lock.writeLock().unlock();
1571	+	awaitTermination(t);
1572	+	}
1573	+
1574	+	/**
1575	+	* getWaitingThreads returns only and all waiting threads
1576	+	*/
1577	+	public void testGetWaitingThreads()      { testGetWaitingThreads(false); }
1578	+	public void testGetWaitingThreads_fair() { testGetWaitingThreads(true); }
1579	+	public void testGetWaitingThreads(boolean fair) {
1580	+	final PublicReentrantReadWriteLock lock =
1581	+	new PublicReentrantReadWriteLock(fair);
1582	+	final Condition c = lock.writeLock().newCondition();
1583	+	final CountDownLatch locked1 = new CountDownLatch(1);
1584	+	final CountDownLatch locked2 = new CountDownLatch(1);
1585	+	Thread t1 = new Thread(new CheckedRunnable() {
1586	+	public void realRun() throws InterruptedException {
1587	+	lock.writeLock().lock();
1588	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1589	+	locked1.countDown();
1590	+	c.await();
1591	+	lock.writeLock().unlock();
1592	+	}});
1593	+
1594	+	Thread t2 = new Thread(new CheckedRunnable() {
1595	+	public void realRun() throws InterruptedException {
1596	+	lock.writeLock().lock();
1597	+	assertFalse(lock.getWaitingThreads(c).isEmpty());
1598	+	locked2.countDown();
1599	+	c.await();
1600	+	lock.writeLock().unlock();
1601	+	}});
1602	+
1603	+	lock.writeLock().lock();
1604	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1605	+	lock.writeLock().unlock();
1606	+
1607	+	t1.start();
1608	+	await(locked1);
1609	+	t2.start();
1610	+	await(locked2);
1611	+
1612	+	lock.writeLock().lock();
1613	+	assertTrue(lock.hasWaiters(c));
1614	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1615	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1616	+	assertEquals(2, lock.getWaitingThreads(c).size());
1617	+	c.signalAll();
1618	+	assertHasNoWaiters(lock, c);
1619	+	lock.writeLock().unlock();
1620	+
1621	+	awaitTermination(t1);
1622	+	awaitTermination(t2);
1623	+
1624	+	assertHasNoWaiters(lock, c);
1625	+	}
1626	+
1627	+	/**
1628	+	* toString indicates current lock state
1629	+	*/
1630	+	public void testToString()      { testToString(false); }
1631	+	public void testToString_fair() { testToString(true); }
1632	+	public void testToString(boolean fair) {
1633	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1634	+	assertTrue(lock.toString().contains("Write locks = 0"));
1635	+	assertTrue(lock.toString().contains("Read locks = 0"));
1636	+	lock.writeLock().lock();
1637	+	assertTrue(lock.toString().contains("Write locks = 1"));
1638	+	assertTrue(lock.toString().contains("Read locks = 0"));
1639	+	lock.writeLock().lock();
1640	+	assertTrue(lock.toString().contains("Write locks = 2"));
1641	+	assertTrue(lock.toString().contains("Read locks = 0"));
1642	+	lock.writeLock().unlock();
1643	+	lock.writeLock().unlock();
1644	+	lock.readLock().lock();
1645	+	assertTrue(lock.toString().contains("Write locks = 0"));
1646	+	assertTrue(lock.toString().contains("Read locks = 1"));
1647	+	lock.readLock().lock();
1648	+	assertTrue(lock.toString().contains("Write locks = 0"));
1649	+	assertTrue(lock.toString().contains("Read locks = 2"));
1650	+	}
1651	+
1652	+	/**
1653	+	* readLock.toString indicates current lock state
1654	+	*/
1655	+	public void testReadLockToString()      { testReadLockToString(false); }
1656	+	public void testReadLockToString_fair() { testReadLockToString(true); }
1657	+	public void testReadLockToString(boolean fair) {
1658	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1659	+	assertTrue(lock.readLock().toString().contains("Read locks = 0"));
1660	+	lock.readLock().lock();
1661	+	assertTrue(lock.readLock().toString().contains("Read locks = 1"));
1662	+	lock.readLock().lock();
1663	+	assertTrue(lock.readLock().toString().contains("Read locks = 2"));
1664	+	lock.readLock().unlock();
1665	+	assertTrue(lock.readLock().toString().contains("Read locks = 1"));
1666	+	lock.readLock().unlock();
1667	+	assertTrue(lock.readLock().toString().contains("Read locks = 0"));
1668	+	}
1669	+
1670	+	/**
1671	+	* writeLock.toString indicates current lock state
1672	+	*/
1673	+	public void testWriteLockToString()      { testWriteLockToString(false); }
1674	+	public void testWriteLockToString_fair() { testWriteLockToString(true); }
1675	+	public void testWriteLockToString(boolean fair) {
1676	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1677	+	assertTrue(lock.writeLock().toString().contains("Unlocked"));
1678	+	lock.writeLock().lock();
1679	+	assertTrue(lock.writeLock().toString().contains("Locked by"));
1680	+	lock.writeLock().unlock();
1681	+	assertTrue(lock.writeLock().toString().contains("Unlocked"));
1682	+	}
1683
1684		}

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