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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.1 by dl, Sun Aug 31 19:24:55 2003 UTC vs.
Revision 1.64 by jsr166, Tue May 24 23:40:14 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 TestCase {
13	<	static int HOLD_COUNT_TEST_LIMIT = 20;
14	<
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		}
18	–
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 extends CheckedRunnable {
29	+	final ReentrantReadWriteLock lock;
30	+	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
31	+	public void realRun() throws InterruptedException {
32	+	lock.writeLock().lockInterruptibly();
33	+	}
34	+	}
35	+
36	+	/**
37	+	* A runnable calling lockInterruptibly that expects to be
38	+	* interrupted
39	+	*/
40	+	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
41	+	final ReentrantReadWriteLock lock;
42	+	InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
43	+	public void realRun() throws InterruptedException {
44	+	lock.writeLock().lockInterruptibly();
45	+	}
46	+	}
47	+
48	+	/**
49	+	* Subclass to expose protected methods
50	+	*/
51	+	static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
52	+	PublicReentrantReadWriteLock() { super(); }
53	+	PublicReentrantReadWriteLock(boolean fair) { super(fair); }
54	+	public Thread getOwner() {
55	+	return super.getOwner();
56	+	}
57	+	public Collection<Thread> getQueuedThreads() {
58	+	return super.getQueuedThreads();
59	+	}
60	+	public Collection<Thread> getWaitingThreads(Condition c) {
61	+	return super.getWaitingThreads(c);
62	+	}
63	+	}
64	+
65	+	/**
66	+	* Releases write lock, checking that it had a hold count of 1.
67	+	*/
68	+	void releaseWriteLock(PublicReentrantReadWriteLock lock) {
69	+	ReentrantReadWriteLock.WriteLock writeLock = lock.writeLock();
70	+	assertWriteLockedByMoi(lock);
71	+	assertEquals(1, lock.getWriteHoldCount());
72	+	writeLock.unlock();
73	+	assertNotWriteLocked(lock);
74	+	}
75	+
76	+	/**
77	+	* Spin-waits until lock.hasQueuedThread(t) becomes true.
78	+	*/
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 AssertionFailedError("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	+	assertEquals(0, lock.getWriteHoldCount());
98	+	assertEquals(0, lock.writeLock().getHoldCount());
99	+	assertNull(lock.getOwner());
100	+	}
101	+
102	+	/**
103	+	* Checks that lock is write-locked by the given thread.
104	+	*/
105	+	void assertWriteLockedBy(PublicReentrantReadWriteLock lock, Thread t) {
106	+	assertTrue(lock.isWriteLocked());
107	+	assertSame(t, lock.getOwner());
108	+	assertEquals(t == Thread.currentThread(),
109	+	lock.isWriteLockedByCurrentThread());
110	+	assertEquals(t == Thread.currentThread(),
111	+	lock.writeLock().isHeldByCurrentThread());
112	+	assertEquals(t == Thread.currentThread(),
113	+	lock.getWriteHoldCount() > 0);
114	+	assertEquals(t == Thread.currentThread(),
115	+	lock.writeLock().getHoldCount() > 0);
116	+	assertEquals(0, lock.getReadLockCount());
117	+	}
118	+
119	+	/**
120	+	* Checks that lock is write-locked by the current thread.
121	+	*/
122	+	void assertWriteLockedByMoi(PublicReentrantReadWriteLock lock) {
123	+	assertWriteLockedBy(lock, Thread.currentThread());
124	+	}
125	+
126	+	/**
127	+	* Checks that condition c has no waiters.
128	+	*/
129	+	void assertHasNoWaiters(PublicReentrantReadWriteLock lock, Condition c) {
130	+	assertHasWaiters(lock, c, new Thread[] {});
131	+	}
132	+
133	+	/**
134	+	* Checks that condition c has exactly the given waiter threads.
135	+	*/
136	+	void assertHasWaiters(PublicReentrantReadWriteLock lock, Condition c,
137	+	Thread... threads) {
138	+	lock.writeLock().lock();
139	+	assertEquals(threads.length > 0, lock.hasWaiters(c));
140	+	assertEquals(threads.length, lock.getWaitQueueLength(c));
141	+	assertEquals(threads.length == 0, lock.getWaitingThreads(c).isEmpty());
142	+	assertEquals(threads.length, lock.getWaitingThreads(c).size());
143	+	assertEquals(new HashSet<Thread>(lock.getWaitingThreads(c)),
144	+	new HashSet<Thread>(Arrays.asList(threads)));
145	+	lock.writeLock().unlock();
146	+	}
147	+
148	+	enum AwaitMethod { await, awaitTimed, awaitNanos, awaitUntil };
149	+
150	+	/**
151	+	* Awaits condition using the specified AwaitMethod.
152	+	*/
153	+	void await(Condition c, AwaitMethod awaitMethod)
154	+	throws InterruptedException {
155	+	switch (awaitMethod) {
156	+	case await:
157	+	c.await();
158	+	break;
159	+	case awaitTimed:
160	+	assertTrue(c.await(2 * LONG_DELAY_MS, MILLISECONDS));
161	+	break;
162	+	case awaitNanos:
163	+	long nanosRemaining = c.awaitNanos(MILLISECONDS.toNanos(2 * LONG_DELAY_MS));
164	+	assertTrue(nanosRemaining > 0);
165	+	break;
166	+	case awaitUntil:
167	+	java.util.Date d = new java.util.Date();
168	+	assertTrue(c.awaitUntil(new java.util.Date(d.getTime() + 2 * LONG_DELAY_MS)));
169	+	break;
170	+	}
171	+	}
172	+
173	+	/**
174	+	* Constructor sets given fairness, and is in unlocked state
175	+	*/
176	+	public void testConstructor() {
177	+	PublicReentrantReadWriteLock lock;
178	+
179	+	lock = new PublicReentrantReadWriteLock();
180	+	assertFalse(lock.isFair());
181	+	assertNotWriteLocked(lock);
182	+	assertEquals(0, lock.getReadLockCount());
183	+
184	+	lock = new PublicReentrantReadWriteLock(true);
185	+	assertTrue(lock.isFair());
186	+	assertNotWriteLocked(lock);
187	+	assertEquals(0, lock.getReadLockCount());
188	+
189	+	lock = new PublicReentrantReadWriteLock(false);
190	+	assertFalse(lock.isFair());
191	+	assertNotWriteLocked(lock);
192	+	assertEquals(0, lock.getReadLockCount());
193	+	}
194	+
195	+	/**
196	+	* write-locking and read-locking an unlocked lock succeed
197	+	*/
198	+	public void testLock()      { testLock(false); }
199	+	public void testLock_fair() { testLock(true); }
200	+	public void testLock(boolean fair) {
201	+	PublicReentrantReadWriteLock lock =
202	+	new PublicReentrantReadWriteLock(fair);
203	+	assertNotWriteLocked(lock);
204	+	lock.writeLock().lock();
205	+	assertWriteLockedByMoi(lock);
206	+	lock.writeLock().unlock();
207	+	assertNotWriteLocked(lock);
208	+	assertEquals(0, lock.getReadLockCount());
209	+	lock.readLock().lock();
210	+	assertNotWriteLocked(lock);
211	+	assertEquals(1, lock.getReadLockCount());
212	+	lock.readLock().unlock();
213	+	assertNotWriteLocked(lock);
214	+	assertEquals(0, lock.getReadLockCount());
215	+	}
216	+
217	+	/**
218	+	* getWriteHoldCount returns number of recursive holds
219	+	*/
220	+	public void testGetWriteHoldCount()      { testGetWriteHoldCount(false); }
221	+	public void testGetWriteHoldCount_fair() { testGetWriteHoldCount(true); }
222	+	public void testGetWriteHoldCount(boolean fair) {
223	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
224	+	for (int i = 1; i <= SIZE; i++) {
225	+	lock.writeLock().lock();
226	+	assertEquals(i,lock.getWriteHoldCount());
227	+	}
228	+	for (int i = SIZE; i > 0; i--) {
229	+	lock.writeLock().unlock();
230	+	assertEquals(i-1,lock.getWriteHoldCount());
231	+	}
232	+	}
233	+
234	+	/**
235	+	* writelock.getHoldCount returns number of recursive holds
236	+	*/
237	+	public void testGetHoldCount()      { testGetHoldCount(false); }
238	+	public void testGetHoldCount_fair() { testGetHoldCount(true); }
239	+	public void testGetHoldCount(boolean fair) {
240	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
241	+	for (int i = 1; i <= SIZE; i++) {
242	+	lock.writeLock().lock();
243	+	assertEquals(i,lock.writeLock().getHoldCount());
244	+	}
245	+	for (int i = SIZE; i > 0; i--) {
246	+	lock.writeLock().unlock();
247	+	assertEquals(i-1,lock.writeLock().getHoldCount());
248	+	}
249	+	}
250	+
251	+	/**
252	+	* getReadHoldCount returns number of recursive holds
253	+	*/
254	+	public void testGetReadHoldCount()      { testGetReadHoldCount(false); }
255	+	public void testGetReadHoldCount_fair() { testGetReadHoldCount(true); }
256	+	public void testGetReadHoldCount(boolean fair) {
257	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
258	+	for (int i = 1; i <= SIZE; i++) {
259	+	lock.readLock().lock();
260	+	assertEquals(i,lock.getReadHoldCount());
261	+	}
262	+	for (int i = SIZE; i > 0; i--) {
263	+	lock.readLock().unlock();
264	+	assertEquals(i-1,lock.getReadHoldCount());
265	+	}
266	+	}
267	+
268	+	/**
269	+	* write-unlocking an unlocked lock throws IllegalMonitorStateException
270	+	*/
271	+	public void testWriteUnlock_IMSE()      { testWriteUnlock_IMSE(false); }
272	+	public void testWriteUnlock_IMSE_fair() { testWriteUnlock_IMSE(true); }
273	+	public void testWriteUnlock_IMSE(boolean fair) {
274	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
275	+	try {
276	+	lock.writeLock().unlock();
277	+	shouldThrow();
278	+	} catch (IllegalMonitorStateException success) {}
279	+	}
280	+
281	+	/**
282	+	* read-unlocking an unlocked lock throws IllegalMonitorStateException
283	+	*/
284	+	public void testReadUnlock_IMSE()      { testReadUnlock_IMSE(false); }
285	+	public void testReadUnlock_IMSE_fair() { testReadUnlock_IMSE(true); }
286	+	public void testReadUnlock_IMSE(boolean fair) {
287	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
288	+	try {
289	+	lock.readLock().unlock();
290	+	shouldThrow();
291	+	} catch (IllegalMonitorStateException success) {}
292	+	}
293	+
294	+	/**
295	+	* write-lockInterruptibly is interruptible
296	+	*/
297	+	public void testWriteLockInterruptibly_Interruptible()      { testWriteLockInterruptibly_Interruptible(false); }
298	+	public void testWriteLockInterruptibly_Interruptible_fair() { testWriteLockInterruptibly_Interruptible(true); }
299	+	public void testWriteLockInterruptibly_Interruptible(boolean fair) {
300	+	final PublicReentrantReadWriteLock lock =
301	+	new PublicReentrantReadWriteLock(fair);
302	+	lock.writeLock().lock();
303	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
304	+	public void realRun() throws InterruptedException {
305	+	lock.writeLock().lockInterruptibly();
306	+	}});
307	+
308	+	waitForQueuedThread(lock, t);
309	+	t.interrupt();
310	+	awaitTermination(t);
311	+	releaseWriteLock(lock);
312	+	}
313	+
314	+	/**
315	+	* timed write-tryLock is interruptible
316	+	*/
317	+	public void testWriteTryLock_Interruptible()      { testWriteTryLock_Interruptible(false); }
318	+	public void testWriteTryLock_Interruptible_fair() { testWriteTryLock_Interruptible(true); }
319	+	public void testWriteTryLock_Interruptible(boolean fair) {
320	+	final PublicReentrantReadWriteLock lock =
321	+	new PublicReentrantReadWriteLock(fair);
322	+	lock.writeLock().lock();
323	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
324	+	public void realRun() throws InterruptedException {
325	+	lock.writeLock().tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
326	+	}});
327	+
328	+	waitForQueuedThread(lock, t);
329	+	t.interrupt();
330	+	awaitTermination(t);
331	+	releaseWriteLock(lock);
332	+	}
333	+
334	+	/**
335	+	* read-lockInterruptibly is interruptible
336	+	*/
337	+	public void testReadLockInterruptibly_Interruptible()      { testReadLockInterruptibly_Interruptible(false); }
338	+	public void testReadLockInterruptibly_Interruptible_fair() { testReadLockInterruptibly_Interruptible(true); }
339	+	public void testReadLockInterruptibly_Interruptible(boolean fair) {
340	+	final PublicReentrantReadWriteLock lock =
341	+	new PublicReentrantReadWriteLock(fair);
342	+	lock.writeLock().lock();
343	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
344	+	public void realRun() throws InterruptedException {
345	+	lock.readLock().lockInterruptibly();
346	+	}});
347	+
348	+	waitForQueuedThread(lock, t);
349	+	t.interrupt();
350	+	awaitTermination(t);
351	+	releaseWriteLock(lock);
352	+	}
353	+
354	+	/**
355	+	* timed read-tryLock is interruptible
356	+	*/
357	+	public void testReadTryLock_Interruptible()      { testReadTryLock_Interruptible(false); }
358	+	public void testReadTryLock_Interruptible_fair() { testReadTryLock_Interruptible(true); }
359	+	public void testReadTryLock_Interruptible(boolean fair) {
360	+	final PublicReentrantReadWriteLock lock =
361	+	new PublicReentrantReadWriteLock(fair);
362	+	lock.writeLock().lock();
363	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
364	+	public void realRun() throws InterruptedException {
365	+	lock.readLock().tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
366	+	}});
367	+
368	+	waitForQueuedThread(lock, t);
369	+	t.interrupt();
370	+	awaitTermination(t);
371	+	releaseWriteLock(lock);
372	+	}
373	+
374	+	/**
375	+	* write-tryLock on an unlocked lock succeeds
376	+	*/
377	+	public void testWriteTryLock()      { testWriteTryLock(false); }
378	+	public void testWriteTryLock_fair() { testWriteTryLock(true); }
379	+	public void testWriteTryLock(boolean fair) {
380	+	final PublicReentrantReadWriteLock lock =
381	+	new PublicReentrantReadWriteLock(fair);
382	+	assertTrue(lock.writeLock().tryLock());
383	+	assertWriteLockedByMoi(lock);
384	+	assertTrue(lock.writeLock().tryLock());
385	+	assertWriteLockedByMoi(lock);
386	+	lock.writeLock().unlock();
387	+	releaseWriteLock(lock);
388	+	}
389	+
390	+	/**
391	+	* write-tryLock fails if locked
392	+	*/
393	+	public void testWriteTryLockWhenLocked()      { testWriteTryLockWhenLocked(false); }
394	+	public void testWriteTryLockWhenLocked_fair() { testWriteTryLockWhenLocked(true); }
395	+	public void testWriteTryLockWhenLocked(boolean fair) {
396	+	final PublicReentrantReadWriteLock lock =
397	+	new PublicReentrantReadWriteLock(fair);
398	+	lock.writeLock().lock();
399	+	Thread t = newStartedThread(new CheckedRunnable() {
400	+	public void realRun() {
401	+	assertFalse(lock.writeLock().tryLock());
402	+	}});
403	+
404	+	awaitTermination(t);
405	+	releaseWriteLock(lock);
406	+	}
407	+
408	+	/**
409	+	* read-tryLock fails if locked
410	+	*/
411	+	public void testReadTryLockWhenLocked()      { testReadTryLockWhenLocked(false); }
412	+	public void testReadTryLockWhenLocked_fair() { testReadTryLockWhenLocked(true); }
413	+	public void testReadTryLockWhenLocked(boolean fair) {
414	+	final PublicReentrantReadWriteLock lock =
415	+	new PublicReentrantReadWriteLock(fair);
416	+	lock.writeLock().lock();
417	+	Thread t = newStartedThread(new CheckedRunnable() {
418	+	public void realRun() {
419	+	assertFalse(lock.readLock().tryLock());
420	+	}});
421	+
422	+	awaitTermination(t);
423	+	releaseWriteLock(lock);
424	+	}
425	+
426	+	/**
427	+	* Multiple threads can hold a read lock when not write-locked
428	+	*/
429	+	public void testMultipleReadLocks()      { testMultipleReadLocks(false); }
430	+	public void testMultipleReadLocks_fair() { testMultipleReadLocks(true); }
431	+	public void testMultipleReadLocks(boolean fair) {
432	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
433	+	lock.readLock().lock();
434	+	Thread t = newStartedThread(new CheckedRunnable() {
435	+	public void realRun() throws InterruptedException {
436	+	assertTrue(lock.readLock().tryLock());
437	+	lock.readLock().unlock();
438	+	assertTrue(lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS));
439	+	lock.readLock().unlock();
440	+	lock.readLock().lock();
441	+	lock.readLock().unlock();
442	+	}});
443	+
444	+	awaitTermination(t);
445	+	lock.readLock().unlock();
446	+	}
447	+
448	+	/**
449	+	* A writelock succeeds only after a reading thread unlocks
450	+	*/
451	+	public void testWriteAfterReadLock()      { testWriteAfterReadLock(false); }
452	+	public void testWriteAfterReadLock_fair() { testWriteAfterReadLock(true); }
453	+	public void testWriteAfterReadLock(boolean fair) {
454	+	final PublicReentrantReadWriteLock lock =
455	+	new PublicReentrantReadWriteLock(fair);
456	+	lock.readLock().lock();
457	+	Thread t = newStartedThread(new CheckedRunnable() {
458	+	public void realRun() {
459	+	assertEquals(1, lock.getReadLockCount());
460	+	lock.writeLock().lock();
461	+	assertEquals(0, lock.getReadLockCount());
462	+	lock.writeLock().unlock();
463	+	}});
464	+	waitForQueuedThread(lock, t);
465	+	assertNotWriteLocked(lock);
466	+	assertEquals(1, lock.getReadLockCount());
467	+	lock.readLock().unlock();
468	+	assertEquals(0, lock.getReadLockCount());
469	+	awaitTermination(t);
470	+	assertNotWriteLocked(lock);
471	+	}
472	+
473	+	/**
474	+	* A writelock succeeds only after reading threads unlock
475	+	*/
476	+	public void testWriteAfterMultipleReadLocks()      { testWriteAfterMultipleReadLocks(false); }
477	+	public void testWriteAfterMultipleReadLocks_fair() { testWriteAfterMultipleReadLocks(true); }
478	+	public void testWriteAfterMultipleReadLocks(boolean fair) {
479	+	final PublicReentrantReadWriteLock lock =
480	+	new PublicReentrantReadWriteLock(fair);
481	+	lock.readLock().lock();
482	+	lock.readLock().lock();
483	+	Thread t1 = newStartedThread(new CheckedRunnable() {
484	+	public void realRun() {
485	+	lock.readLock().lock();
486	+	assertEquals(3, lock.getReadLockCount());
487	+	lock.readLock().unlock();
488	+	}});
489	+	awaitTermination(t1);
490	+
491	+	Thread t2 = newStartedThread(new CheckedRunnable() {
492	+	public void realRun() {
493	+	assertEquals(2, lock.getReadLockCount());
494	+	lock.writeLock().lock();
495	+	assertEquals(0, lock.getReadLockCount());
496	+	lock.writeLock().unlock();
497	+	}});
498	+	waitForQueuedThread(lock, t2);
499	+	assertNotWriteLocked(lock);
500	+	assertEquals(2, lock.getReadLockCount());
501	+	lock.readLock().unlock();
502	+	lock.readLock().unlock();
503	+	assertEquals(0, lock.getReadLockCount());
504	+	awaitTermination(t2);
505	+	assertNotWriteLocked(lock);
506	+	}
507	+
508	+	/**
509	+	* A thread that tries to acquire a fair read lock (non-reentrantly)
510	+	* will block if there is a waiting writer thread
511	+	*/
512	+	public void testReaderWriterReaderFairFifo() {
513	+	final PublicReentrantReadWriteLock lock =
514	+	new PublicReentrantReadWriteLock(true);
515	+	final AtomicBoolean t1GotLock = new AtomicBoolean(false);
516	+
517	+	lock.readLock().lock();
518	+	Thread t1 = newStartedThread(new CheckedRunnable() {
519	+	public void realRun() {
520	+	assertEquals(1, lock.getReadLockCount());
521	+	lock.writeLock().lock();
522	+	assertEquals(0, lock.getReadLockCount());
523	+	t1GotLock.set(true);
524	+	lock.writeLock().unlock();
525	+	}});
526	+	waitForQueuedThread(lock, t1);
527	+
528	+	Thread t2 = newStartedThread(new CheckedRunnable() {
529	+	public void realRun() {
530	+	assertEquals(1, lock.getReadLockCount());
531	+	lock.readLock().lock();
532	+	assertEquals(1, lock.getReadLockCount());
533	+	assertTrue(t1GotLock.get());
534	+	lock.readLock().unlock();
535	+	}});
536	+	waitForQueuedThread(lock, t2);
537	+	assertTrue(t1.isAlive());
538	+	assertNotWriteLocked(lock);
539	+	assertEquals(1, lock.getReadLockCount());
540	+	lock.readLock().unlock();
541	+	awaitTermination(t1);
542	+	awaitTermination(t2);
543	+	assertNotWriteLocked(lock);
544	+	}
545	+
546	+	/**
547	+	* Readlocks succeed only after a writing thread unlocks
548	+	*/
549	+	public void testReadAfterWriteLock()      { testReadAfterWriteLock(false); }
550	+	public void testReadAfterWriteLock_fair() { testReadAfterWriteLock(true); }
551	+	public void testReadAfterWriteLock(boolean fair) {
552	+	final PublicReentrantReadWriteLock lock =
553	+	new PublicReentrantReadWriteLock(fair);
554	+	lock.writeLock().lock();
555	+	Thread t1 = newStartedThread(new CheckedRunnable() {
556	+	public void realRun() {
557	+	lock.readLock().lock();
558	+	lock.readLock().unlock();
559	+	}});
560	+	Thread t2 = newStartedThread(new CheckedRunnable() {
561	+	public void realRun() {
562	+	lock.readLock().lock();
563	+	lock.readLock().unlock();
564	+	}});
565	+
566	+	waitForQueuedThread(lock, t1);
567	+	waitForQueuedThread(lock, t2);
568	+	releaseWriteLock(lock);
569	+	awaitTermination(t1);
570	+	awaitTermination(t2);
571	+	}
572	+
573	+	/**
574	+	* Read trylock succeeds if write locked by current thread
575	+	*/
576	+	public void testReadHoldingWriteLock()      { testReadHoldingWriteLock(false); }
577	+	public void testReadHoldingWriteLock_fair() { testReadHoldingWriteLock(true); }
578	+	public void testReadHoldingWriteLock(boolean fair) {
579	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
580	+	lock.writeLock().lock();
581	+	assertTrue(lock.readLock().tryLock());
582	+	lock.readLock().unlock();
583	+	lock.writeLock().unlock();
584	+	}
585	+
586	+	/**
587	+	* Read trylock succeeds (barging) even in the presence of waiting
588	+	* readers and/or writers
589	+	*/
590	+	public void testReadTryLockBarging()      { testReadTryLockBarging(false); }
591	+	public void testReadTryLockBarging_fair() { testReadTryLockBarging(true); }
592	+	public void testReadTryLockBarging(boolean fair) {
593	+	final PublicReentrantReadWriteLock lock =
594	+	new PublicReentrantReadWriteLock(fair);
595	+	lock.readLock().lock();
596	+
597	+	Thread t1 = newStartedThread(new CheckedRunnable() {
598	+	public void realRun() {
599	+	lock.writeLock().lock();
600	+	lock.writeLock().unlock();
601	+	}});
602	+
603	+	waitForQueuedThread(lock, t1);
604	+
605	+	Thread t2 = newStartedThread(new CheckedRunnable() {
606	+	public void realRun() {
607	+	lock.readLock().lock();
608	+	lock.readLock().unlock();
609	+	}});
610	+
611	+	if (fair)
612	+	waitForQueuedThread(lock, t2);
613	+
614	+	Thread t3 = newStartedThread(new CheckedRunnable() {
615	+	public void realRun() {
616	+	lock.readLock().tryLock();
617	+	lock.readLock().unlock();
618	+	}});
619	+
620	+	assertTrue(lock.getReadLockCount() > 0);
621	+	awaitTermination(t3);
622	+	assertTrue(t1.isAlive());
623	+	if (fair) assertTrue(t2.isAlive());
624	+	lock.readLock().unlock();
625	+	awaitTermination(t1);
626	+	awaitTermination(t2);
627	+	}
628	+
629	+	/**
630	+	* Read lock succeeds if write locked by current thread even if
631	+	* other threads are waiting for readlock
632	+	*/
633	+	public void testReadHoldingWriteLock2()      { testReadHoldingWriteLock2(false); }
634	+	public void testReadHoldingWriteLock2_fair() { testReadHoldingWriteLock2(true); }
635	+	public void testReadHoldingWriteLock2(boolean fair) {
636	+	final PublicReentrantReadWriteLock lock =
637	+	new PublicReentrantReadWriteLock(fair);
638	+	lock.writeLock().lock();
639	+	lock.readLock().lock();
640	+	lock.readLock().unlock();
641	+
642	+	Thread t1 = newStartedThread(new CheckedRunnable() {
643	+	public void realRun() {
644	+	lock.readLock().lock();
645	+	lock.readLock().unlock();
646	+	}});
647	+	Thread t2 = newStartedThread(new CheckedRunnable() {
648	+	public void realRun() {
649	+	lock.readLock().lock();
650	+	lock.readLock().unlock();
651	+	}});
652	+
653	+	waitForQueuedThread(lock, t1);
654	+	waitForQueuedThread(lock, t2);
655	+	assertWriteLockedByMoi(lock);
656	+	lock.readLock().lock();
657	+	lock.readLock().unlock();
658	+	releaseWriteLock(lock);
659	+	awaitTermination(t1);
660	+	awaitTermination(t2);
661	+	}
662	+
663	+	/**
664	+	* Read lock succeeds if write locked by current thread even if
665	+	* other threads are waiting for writelock
666	+	*/
667	+	public void testReadHoldingWriteLock3()      { testReadHoldingWriteLock3(false); }
668	+	public void testReadHoldingWriteLock3_fair() { testReadHoldingWriteLock3(true); }
669	+	public void testReadHoldingWriteLock3(boolean fair) {
670	+	final PublicReentrantReadWriteLock lock =
671	+	new PublicReentrantReadWriteLock(fair);
672	+	lock.writeLock().lock();
673	+	lock.readLock().lock();
674	+	lock.readLock().unlock();
675	+
676	+	Thread t1 = newStartedThread(new CheckedRunnable() {
677	+	public void realRun() {
678	+	lock.writeLock().lock();
679	+	lock.writeLock().unlock();
680	+	}});
681	+	Thread t2 = newStartedThread(new CheckedRunnable() {
682	+	public void realRun() {
683	+	lock.writeLock().lock();
684	+	lock.writeLock().unlock();
685	+	}});
686	+
687	+	waitForQueuedThread(lock, t1);
688	+	waitForQueuedThread(lock, t2);
689	+	assertWriteLockedByMoi(lock);
690	+	lock.readLock().lock();
691	+	lock.readLock().unlock();
692	+	assertWriteLockedByMoi(lock);
693	+	lock.writeLock().unlock();
694	+	awaitTermination(t1);
695	+	awaitTermination(t2);
696	+	}
697	+
698	+	/**
699	+	* Write lock succeeds if write locked by current thread even if
700	+	* other threads are waiting for writelock
701	+	*/
702	+	public void testWriteHoldingWriteLock4()      { testWriteHoldingWriteLock4(false); }
703	+	public void testWriteHoldingWriteLock4_fair() { testWriteHoldingWriteLock4(true); }
704	+	public void testWriteHoldingWriteLock4(boolean fair) {
705	+	final PublicReentrantReadWriteLock lock =
706	+	new PublicReentrantReadWriteLock(fair);
707	+	lock.writeLock().lock();
708	+	lock.writeLock().lock();
709	+	lock.writeLock().unlock();
710	+
711	+	Thread t1 = newStartedThread(new CheckedRunnable() {
712	+	public void realRun() {
713	+	lock.writeLock().lock();
714	+	lock.writeLock().unlock();
715	+	}});
716	+	Thread t2 = newStartedThread(new CheckedRunnable() {
717	+	public void realRun() {
718	+	lock.writeLock().lock();
719	+	lock.writeLock().unlock();
720	+	}});
721	+
722	+	waitForQueuedThread(lock, t1);
723	+	waitForQueuedThread(lock, t2);
724	+	assertWriteLockedByMoi(lock);
725	+	assertEquals(1, lock.getWriteHoldCount());
726	+	lock.writeLock().lock();
727	+	assertWriteLockedByMoi(lock);
728	+	assertEquals(2, lock.getWriteHoldCount());
729	+	lock.writeLock().unlock();
730	+	assertWriteLockedByMoi(lock);
731	+	assertEquals(1, lock.getWriteHoldCount());
732	+	lock.writeLock().unlock();
733	+	awaitTermination(t1);
734	+	awaitTermination(t2);
735	+	}
736	+
737	+	/**
738	+	* Read tryLock succeeds if readlocked but not writelocked
739	+	*/
740	+	public void testTryLockWhenReadLocked()      { testTryLockWhenReadLocked(false); }
741	+	public void testTryLockWhenReadLocked_fair() { testTryLockWhenReadLocked(true); }
742	+	public void testTryLockWhenReadLocked(boolean fair) {
743	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
744	+	lock.readLock().lock();
745	+	Thread t = newStartedThread(new CheckedRunnable() {
746	+	public void realRun() {
747	+	assertTrue(lock.readLock().tryLock());
748	+	lock.readLock().unlock();
749	+	}});
750	+
751	+	awaitTermination(t);
752	+	lock.readLock().unlock();
753	+	}
754	+
755	+	/**
756	+	* write tryLock fails when readlocked
757	+	*/
758	+	public void testWriteTryLockWhenReadLocked()      { testWriteTryLockWhenReadLocked(false); }
759	+	public void testWriteTryLockWhenReadLocked_fair() { testWriteTryLockWhenReadLocked(true); }
760	+	public void testWriteTryLockWhenReadLocked(boolean fair) {
761	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
762	+	lock.readLock().lock();
763	+	Thread t = newStartedThread(new CheckedRunnable() {
764	+	public void realRun() {
765	+	assertFalse(lock.writeLock().tryLock());
766	+	}});
767	+
768	+	awaitTermination(t);
769	+	lock.readLock().unlock();
770	+	}
771	+
772	+	/**
773	+	* write timed tryLock times out if locked
774	+	*/
775	+	public void testWriteTryLock_Timeout()      { testWriteTryLock_Timeout(false); }
776	+	public void testWriteTryLock_Timeout_fair() { testWriteTryLock_Timeout(true); }
777	+	public void testWriteTryLock_Timeout(boolean fair) {
778	+	final PublicReentrantReadWriteLock lock =
779	+	new PublicReentrantReadWriteLock(fair);
780	+	lock.writeLock().lock();
781	+	Thread t = newStartedThread(new CheckedRunnable() {
782	+	public void realRun() throws InterruptedException {
783	+	long startTime = System.nanoTime();
784	+	long timeoutMillis = 10;
785	+	assertFalse(lock.writeLock().tryLock(timeoutMillis, MILLISECONDS));
786	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
787	+	}});
788	+
789	+	awaitTermination(t);
790	+	releaseWriteLock(lock);
791	+	}
792	+
793	+	/**
794	+	* read timed tryLock times out if write-locked
795	+	*/
796	+	public void testReadTryLock_Timeout()      { testReadTryLock_Timeout(false); }
797	+	public void testReadTryLock_Timeout_fair() { testReadTryLock_Timeout(true); }
798	+	public void testReadTryLock_Timeout(boolean fair) {
799	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
800	+	lock.writeLock().lock();
801	+	Thread t = newStartedThread(new CheckedRunnable() {
802	+	public void realRun() throws InterruptedException {
803	+	long startTime = System.nanoTime();
804	+	long timeoutMillis = 10;
805	+	assertFalse(lock.readLock().tryLock(timeoutMillis, MILLISECONDS));
806	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
807	+	}});
808	+
809	+	awaitTermination(t);
810	+	assertTrue(lock.writeLock().isHeldByCurrentThread());
811	+	lock.writeLock().unlock();
812	+	}
813	+
814	+	/**
815	+	* write lockInterruptibly succeeds if unlocked, else is interruptible
816	+	*/
817	+	public void testWriteLockInterruptibly()      { testWriteLockInterruptibly(false); }
818	+	public void testWriteLockInterruptibly_fair() { testWriteLockInterruptibly(true); }
819	+	public void testWriteLockInterruptibly(boolean fair) {
820	+	final PublicReentrantReadWriteLock lock =
821	+	new PublicReentrantReadWriteLock(fair);
822	+	try {
823	+	lock.writeLock().lockInterruptibly();
824	+	} catch (InterruptedException ie) {
825	+	threadUnexpectedException(ie);
826	+	}
827	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
828	+	public void realRun() throws InterruptedException {
829	+	lock.writeLock().lockInterruptibly();
830	+	}});
831	+
832	+	waitForQueuedThread(lock, t);
833	+	t.interrupt();
834	+	assertTrue(lock.writeLock().isHeldByCurrentThread());
835	+	awaitTermination(t);
836	+	releaseWriteLock(lock);
837	+	}
838	+
839	+	/**
840	+	* read lockInterruptibly succeeds if lock free else is interruptible
841	+	*/
842	+	public void testReadLockInterruptibly()      { testReadLockInterruptibly(false); }
843	+	public void testReadLockInterruptibly_fair() { testReadLockInterruptibly(true); }
844	+	public void testReadLockInterruptibly(boolean fair) {
845	+	final PublicReentrantReadWriteLock lock =
846	+	new PublicReentrantReadWriteLock(fair);
847	+	try {
848	+	lock.readLock().lockInterruptibly();
849	+	lock.readLock().unlock();
850	+	lock.writeLock().lockInterruptibly();
851	+	} catch (InterruptedException ie) {
852	+	threadUnexpectedException(ie);
853	+	}
854	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
855	+	public void realRun() throws InterruptedException {
856	+	lock.readLock().lockInterruptibly();
857	+	}});
858	+
859	+	waitForQueuedThread(lock, t);
860	+	t.interrupt();
861	+	awaitTermination(t);
862	+	releaseWriteLock(lock);
863	+	}
864	+
865	+	/**
866	+	* Calling await without holding lock throws IllegalMonitorStateException
867	+	*/
868	+	public void testAwait_IMSE()      { testAwait_IMSE(false); }
869	+	public void testAwait_IMSE_fair() { testAwait_IMSE(true); }
870	+	public void testAwait_IMSE(boolean fair) {
871	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
872	+	final Condition c = lock.writeLock().newCondition();
873	+	for (AwaitMethod awaitMethod : AwaitMethod.values()) {
874	+	long startTime = System.nanoTime();
875	+	try {
876	+	await(c, awaitMethod);
877	+	shouldThrow();
878	+	} catch (IllegalMonitorStateException success) {
879	+	} catch (InterruptedException e) { threadUnexpectedException(e); }
880	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
881	+	}
882	+	}
883	+
884	+	/**
885	+	* Calling signal without holding lock throws IllegalMonitorStateException
886	+	*/
887	+	public void testSignal_IMSE()      { testSignal_IMSE(false); }
888	+	public void testSignal_IMSE_fair() { testSignal_IMSE(true); }
889	+	public void testSignal_IMSE(boolean fair) {
890	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
891	+	final Condition c = lock.writeLock().newCondition();
892	+	try {
893	+	c.signal();
894	+	shouldThrow();
895	+	} catch (IllegalMonitorStateException success) {}
896	+	}
897	+
898	+	/**
899	+	* Calling signalAll without holding lock throws IllegalMonitorStateException
900	+	*/
901	+	public void testSignalAll_IMSE()      { testSignalAll_IMSE(false); }
902	+	public void testSignalAll_IMSE_fair() { testSignalAll_IMSE(true); }
903	+	public void testSignalAll_IMSE(boolean fair) {
904	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
905	+	final Condition c = lock.writeLock().newCondition();
906	+	try {
907	+	c.signalAll();
908	+	shouldThrow();
909	+	} catch (IllegalMonitorStateException success) {}
910	+	}
911	+
912	+	/**
913	+	* awaitNanos without a signal times out
914	+	*/
915	+	public void testAwaitNanos_Timeout()      { testAwaitNanos_Timeout(false); }
916	+	public void testAwaitNanos_Timeout_fair() { testAwaitNanos_Timeout(true); }
917	+	public void testAwaitNanos_Timeout(boolean fair) {
918	+	try {
919	+	final ReentrantReadWriteLock lock =
920	+	new ReentrantReadWriteLock(fair);
921	+	final Condition c = lock.writeLock().newCondition();
922	+	lock.writeLock().lock();
923	+	long startTime = System.nanoTime();
924	+	long timeoutMillis = 10;
925	+	long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis);
926	+	long nanosRemaining = c.awaitNanos(timeoutNanos);
927	+	assertTrue(nanosRemaining <= 0);
928	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
929	+	lock.writeLock().unlock();
930	+	} catch (InterruptedException e) {
931	+	threadUnexpectedException(e);
932	+	}
933	+	}
934	+
935	+	/**
936	+	* timed await without a signal times out
937	+	*/
938	+	public void testAwait_Timeout()      { testAwait_Timeout(false); }
939	+	public void testAwait_Timeout_fair() { testAwait_Timeout(true); }
940	+	public void testAwait_Timeout(boolean fair) {
941	+	try {
942	+	final ReentrantReadWriteLock lock =
943	+	new ReentrantReadWriteLock(fair);
944	+	final Condition c = lock.writeLock().newCondition();
945	+	lock.writeLock().lock();
946	+	long startTime = System.nanoTime();
947	+	long timeoutMillis = 10;
948	+	assertFalse(c.await(timeoutMillis, MILLISECONDS));
949	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
950	+	lock.writeLock().unlock();
951	+	} catch (InterruptedException e) {
952	+	threadUnexpectedException(e);
953	+	}
954	+	}
955	+
956	+	/**
957	+	* awaitUntil without a signal times out
958	+	*/
959	+	public void testAwaitUntil_Timeout()      { testAwaitUntil_Timeout(false); }
960	+	public void testAwaitUntil_Timeout_fair() { testAwaitUntil_Timeout(true); }
961	+	public void testAwaitUntil_Timeout(boolean fair) {
962	+	try {
963	+	final ReentrantReadWriteLock lock =
964	+	new ReentrantReadWriteLock(fair);
965	+	final Condition c = lock.writeLock().newCondition();
966	+	lock.writeLock().lock();
967	+	long startTime = System.nanoTime();
968	+	long timeoutMillis = 10;
969	+	java.util.Date d = new java.util.Date();
970	+	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + timeoutMillis)));
971	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
972	+	lock.writeLock().unlock();
973	+	} catch (InterruptedException e) {
974	+	threadUnexpectedException(e);
975	+	}
976	+	}
977	+
978	+	/**
979	+	* await returns when signalled
980	+	*/
981	+	public void testAwait()      { testAwait(false); }
982	+	public void testAwait_fair() { testAwait(true); }
983	+	public void testAwait(boolean fair) {
984	+	final PublicReentrantReadWriteLock lock =
985	+	new PublicReentrantReadWriteLock(fair);
986	+	final Condition c = lock.writeLock().newCondition();
987	+	final CountDownLatch locked = new CountDownLatch(1);
988	+	Thread t = newStartedThread(new CheckedRunnable() {
989	+	public void realRun() throws InterruptedException {
990	+	lock.writeLock().lock();
991	+	locked.countDown();
992	+	c.await();
993	+	lock.writeLock().unlock();
994	+	}});
995	+
996	+	await(locked);
997	+	lock.writeLock().lock();
998	+	assertHasWaiters(lock, c, t);
999	+	c.signal();
1000	+	assertHasNoWaiters(lock, c);
1001	+	assertTrue(t.isAlive());
1002	+	lock.writeLock().unlock();
1003	+	awaitTermination(t);
1004	+	}
1005	+
1006	+	/**
1007	+	* awaitUninterruptibly doesn't abort on interrupt
1008	+	*/
1009	+	public void testAwaitUninterruptibly()      { testAwaitUninterruptibly(false); }
1010	+	public void testAwaitUninterruptibly_fair() { testAwaitUninterruptibly(true); }
1011	+	public void testAwaitUninterruptibly(boolean fair) {
1012	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1013	+	final Condition c = lock.writeLock().newCondition();
1014	+	final CountDownLatch locked = new CountDownLatch(1);
1015	+	Thread t = newStartedThread(new CheckedRunnable() {
1016	+	public void realRun() {
1017	+	lock.writeLock().lock();
1018	+	locked.countDown();
1019	+	c.awaitUninterruptibly();
1020	+	assertTrue(Thread.interrupted());
1021	+	lock.writeLock().unlock();
1022	+	}});
1023	+
1024	+	await(locked);
1025	+	lock.writeLock().lock();
1026	+	lock.writeLock().unlock();
1027	+	t.interrupt();
1028	+	long timeoutMillis = 10;
1029	+	assertThreadStaysAlive(t, timeoutMillis);
1030	+	lock.writeLock().lock();
1031	+	c.signal();
1032	+	lock.writeLock().unlock();
1033	+	awaitTermination(t);
1034	+	}
1035	+
1036	+	/**
1037	+	* await/awaitNanos/awaitUntil is interruptible
1038	+	*/
1039	+	public void testInterruptible_await()           { testInterruptible(false, AwaitMethod.await); }
1040	+	public void testInterruptible_await_fair()      { testInterruptible(true,  AwaitMethod.await); }
1041	+	public void testInterruptible_awaitTimed()      { testInterruptible(false, AwaitMethod.awaitTimed); }
1042	+	public void testInterruptible_awaitTimed_fair() { testInterruptible(true,  AwaitMethod.awaitTimed); }
1043	+	public void testInterruptible_awaitNanos()      { testInterruptible(false, AwaitMethod.awaitNanos); }
1044	+	public void testInterruptible_awaitNanos_fair() { testInterruptible(true,  AwaitMethod.awaitNanos); }
1045	+	public void testInterruptible_awaitUntil()      { testInterruptible(false, AwaitMethod.awaitUntil); }
1046	+	public void testInterruptible_awaitUntil_fair() { testInterruptible(true,  AwaitMethod.awaitUntil); }
1047	+	public void testInterruptible(boolean fair, final AwaitMethod awaitMethod) {
1048	+	final PublicReentrantReadWriteLock lock =
1049	+	new PublicReentrantReadWriteLock(fair);
1050	+	final Condition c = lock.writeLock().newCondition();
1051	+	final CountDownLatch locked = new CountDownLatch(1);
1052	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1053	+	public void realRun() throws InterruptedException {
1054	+	lock.writeLock().lock();
1055	+	assertWriteLockedByMoi(lock);
1056	+	assertHasNoWaiters(lock, c);
1057	+	locked.countDown();
1058	+	try {
1059	+	await(c, awaitMethod);
1060	+	} finally {
1061	+	assertWriteLockedByMoi(lock);
1062	+	assertHasNoWaiters(lock, c);
1063	+	lock.writeLock().unlock();
1064	+	assertFalse(Thread.interrupted());
1065	+	}
1066	+	}});
1067	+
1068	+	await(locked);
1069	+	assertHasWaiters(lock, c, t);
1070	+	t.interrupt();
1071	+	awaitTermination(t);
1072	+	assertNotWriteLocked(lock);
1073	+	}
1074	+
1075	+	/**
1076	+	* signalAll wakes up all threads
1077	+	*/
1078	+	public void testSignalAll_await()           { testSignalAll(false, AwaitMethod.await); }
1079	+	public void testSignalAll_await_fair()      { testSignalAll(true,  AwaitMethod.await); }
1080	+	public void testSignalAll_awaitTimed()      { testSignalAll(false, AwaitMethod.awaitTimed); }
1081	+	public void testSignalAll_awaitTimed_fair() { testSignalAll(true,  AwaitMethod.awaitTimed); }
1082	+	public void testSignalAll_awaitNanos()      { testSignalAll(false, AwaitMethod.awaitNanos); }
1083	+	public void testSignalAll_awaitNanos_fair() { testSignalAll(true,  AwaitMethod.awaitNanos); }
1084	+	public void testSignalAll_awaitUntil()      { testSignalAll(false, AwaitMethod.awaitUntil); }
1085	+	public void testSignalAll_awaitUntil_fair() { testSignalAll(true,  AwaitMethod.awaitUntil); }
1086	+	public void testSignalAll(boolean fair, final AwaitMethod awaitMethod) {
1087	+	final PublicReentrantReadWriteLock lock =
1088	+	new PublicReentrantReadWriteLock(fair);
1089	+	final Condition c = lock.writeLock().newCondition();
1090	+	final CountDownLatch locked = new CountDownLatch(2);
1091	+	final Lock writeLock = lock.writeLock();
1092	+	class Awaiter extends CheckedRunnable {
1093	+	public void realRun() throws InterruptedException {
1094	+	writeLock.lock();
1095	+	locked.countDown();
1096	+	await(c, awaitMethod);
1097	+	writeLock.unlock();
1098	+	}
1099	+	}
1100	+
1101	+	Thread t1 = newStartedThread(new Awaiter());
1102	+	Thread t2 = newStartedThread(new Awaiter());
1103	+
1104	+	await(locked);
1105	+	writeLock.lock();
1106	+	assertHasWaiters(lock, c, t1, t2);
1107	+	c.signalAll();
1108	+	assertHasNoWaiters(lock, c);
1109	+	writeLock.unlock();
1110	+	awaitTermination(t1);
1111	+	awaitTermination(t2);
1112	+	}
1113	+
1114	+	/**
1115	+	* signal wakes up waiting threads in FIFO order
1116	+	*/
1117	+	public void testSignalWakesFifo()      { testSignalWakesFifo(false); }
1118	+	public void testSignalWakesFifo_fair() { testSignalWakesFifo(true); }
1119	+	public void testSignalWakesFifo(boolean fair) {
1120	+	final PublicReentrantReadWriteLock lock =
1121	+	new PublicReentrantReadWriteLock(fair);
1122	+	final Condition c = lock.writeLock().newCondition();
1123	+	final CountDownLatch locked1 = new CountDownLatch(1);
1124	+	final CountDownLatch locked2 = new CountDownLatch(1);
1125	+	final Lock writeLock = lock.writeLock();
1126	+	Thread t1 = newStartedThread(new CheckedRunnable() {
1127	+	public void realRun() throws InterruptedException {
1128	+	writeLock.lock();
1129	+	locked1.countDown();
1130	+	c.await();
1131	+	writeLock.unlock();
1132	+	}});
1133	+
1134	+	await(locked1);
1135	+
1136	+	Thread t2 = newStartedThread(new CheckedRunnable() {
1137	+	public void realRun() throws InterruptedException {
1138	+	writeLock.lock();
1139	+	locked2.countDown();
1140	+	c.await();
1141	+	writeLock.unlock();
1142	+	}});
1143	+
1144	+	await(locked2);
1145	+
1146	+	writeLock.lock();
1147	+	assertHasWaiters(lock, c, t1, t2);
1148	+	assertFalse(lock.hasQueuedThreads());
1149	+	c.signal();
1150	+	assertHasWaiters(lock, c, t2);
1151	+	assertTrue(lock.hasQueuedThread(t1));
1152	+	assertFalse(lock.hasQueuedThread(t2));
1153	+	c.signal();
1154	+	assertHasNoWaiters(lock, c);
1155	+	assertTrue(lock.hasQueuedThread(t1));
1156	+	assertTrue(lock.hasQueuedThread(t2));
1157	+	writeLock.unlock();
1158	+	awaitTermination(t1);
1159	+	awaitTermination(t2);
1160	+	}
1161	+
1162	+	/**
1163	+	* await after multiple reentrant locking preserves lock count
1164	+	*/
1165	+	public void testAwaitLockCount()      { testAwaitLockCount(false); }
1166	+	public void testAwaitLockCount_fair() { testAwaitLockCount(true); }
1167	+	public void testAwaitLockCount(boolean fair) {
1168	+	final PublicReentrantReadWriteLock lock =
1169	+	new PublicReentrantReadWriteLock(fair);
1170	+	final Condition c = lock.writeLock().newCondition();
1171	+	final CountDownLatch locked = new CountDownLatch(2);
1172	+	Thread t1 = newStartedThread(new CheckedRunnable() {
1173	+	public void realRun() throws InterruptedException {
1174	+	lock.writeLock().lock();
1175	+	assertWriteLockedByMoi(lock);
1176	+	assertEquals(1, lock.writeLock().getHoldCount());
1177	+	locked.countDown();
1178	+	c.await();
1179	+	assertWriteLockedByMoi(lock);
1180	+	assertEquals(1, lock.writeLock().getHoldCount());
1181	+	lock.writeLock().unlock();
1182	+	}});
1183	+
1184	+	Thread t2 = newStartedThread(new CheckedRunnable() {
1185	+	public void realRun() throws InterruptedException {
1186	+	lock.writeLock().lock();
1187	+	lock.writeLock().lock();
1188	+	assertWriteLockedByMoi(lock);
1189	+	assertEquals(2, lock.writeLock().getHoldCount());
1190	+	locked.countDown();
1191	+	c.await();
1192	+	assertWriteLockedByMoi(lock);
1193	+	assertEquals(2, lock.writeLock().getHoldCount());
1194	+	lock.writeLock().unlock();
1195	+	lock.writeLock().unlock();
1196	+	}});
1197	+
1198	+	await(locked);
1199	+	lock.writeLock().lock();
1200	+	assertHasWaiters(lock, c, t1, t2);
1201	+	c.signalAll();
1202	+	assertHasNoWaiters(lock, c);
1203	+	lock.writeLock().unlock();
1204	+	awaitTermination(t1);
1205	+	awaitTermination(t2);
1206	+	}
1207	+
1208	+	/**
1209	+	* A serialized lock deserializes as unlocked
1210	+	*/
1211	+	public void testSerialization()      { testSerialization(false); }
1212	+	public void testSerialization_fair() { testSerialization(true); }
1213	+	public void testSerialization(boolean fair) {
1214	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1215	+	lock.writeLock().lock();
1216	+	lock.readLock().lock();
1217
1218	<	private static long SHORT_DELAY_MS = 100;
1219	<	private static long MEDIUM_DELAY_MS = 1000;
1220	<	private static long LONG_DELAY_MS = 10000;
1221	<
1222	<	/*
1223	<	* Unlocks an unlocked lock, throws Illegal Monitor State
1224	<	*
1225	<	*/
1226	<
1227	<	public void testIllegalMonitorStateException(){
1228	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
1229	<	try{
1230	<	rl.writeLock().unlock();
1231	<	fail("Should of thown Illegal Monitor State Exception");
1232	<
1233	<	}catch(IllegalMonitorStateException sucess){}
1234	<
1235	<
1236	<	}
1237	<
1238	<	/*
1239	<	* makes a lock, locks it, tries to aquire the lock in another thread
1240	<	* interrupts that thread and waits for an interrupted Exception to
1241	<	* be thrown.
1242	<	*/
1243	<
1244	<	public void testInterruptedException(){
1245	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1246	<	lock.writeLock().lock();
1247	<	Thread t = new Thread(new Runnable() {
1248	<	public void run(){
1249	<	try{
1250	<	lock.writeLock().lockInterruptibly();
1251	<	fail("should throw");
1252	<	}catch(InterruptedException sucess){}
1253	<	}
1254	<	});
1255	<	t.start();
1256	<	t.interrupt();
1257	<	lock.writeLock().unlock();
1258	<	}
1259	<
1260	<	/*
1261	<	* tests for interrupted exception on a timed wait
1262	<	*
1263	<	*/
1264	<
1265	<
1266	<	public void testInterruptedException2(){
1267	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1268	<	lock.writeLock().lock();
1269	<	Thread t = new Thread(new Runnable() {
1270	<	public void run(){
1271	<	try{
1272	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
1273	<	fail("should throw");
1274	<	}catch(InterruptedException sucess){}
1275	<	}
1276	<	});
1277	<	t.start();
1278	<	t.interrupt();
1279	<	}
1280	<
1281	<
1282	<
1283	<	/*
1284	<	* current thread locks interruptibly the thread
1285	<	* another thread tries to aquire the lock and blocks
1286	<	* on the call. interrupt the attempted aquireLock
1287	<	* assert that the first lock() call actually locked the lock
1288	<	* assert that the current thread is the one holding the lock
1289	<	*/
1290	<
1291	<	public void testLockedInterruptibly() {
1292	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1293	<	try {lock.writeLock().lockInterruptibly();} catch(Exception e) {}
1294	<	Thread t = new Thread(new Runnable() {
1295	<	public void run() {
1296	<	try {
1297	<	lock.writeLock().lockInterruptibly();
1298	<	fail("Failed to generate an Interrupted Exception");
1299	<	}
1300	<	catch(InterruptedException e) {}
1301	<	}
1302	<	});
1303	<	t.start();
1304	<	t.interrupt();
1218	>	ReentrantReadWriteLock clone = serialClone(lock);
1219	>	assertEquals(lock.isFair(), clone.isFair());
1220	>	assertTrue(lock.isWriteLocked());
1221	>	assertFalse(clone.isWriteLocked());
1222	>	assertEquals(1, lock.getReadLockCount());
1223	>	assertEquals(0, clone.getReadLockCount());
1224	>	clone.writeLock().lock();
1225	>	clone.readLock().lock();
1226	>	assertTrue(clone.isWriteLocked());
1227	>	assertEquals(1, clone.getReadLockCount());
1228	>	clone.readLock().unlock();
1229	>	clone.writeLock().unlock();
1230	>	assertFalse(clone.isWriteLocked());
1231	>	assertEquals(1, lock.getReadLockCount());
1232	>	assertEquals(0, clone.getReadLockCount());
1233	>	}
1234	>
1235	>	/**
1236	>	* hasQueuedThreads reports whether there are waiting threads
1237	>	*/
1238	>	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
1239	>	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
1240	>	public void testHasQueuedThreads(boolean fair) {
1241	>	final PublicReentrantReadWriteLock lock =
1242	>	new PublicReentrantReadWriteLock(fair);
1243	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1244	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1245	>	assertFalse(lock.hasQueuedThreads());
1246	>	lock.writeLock().lock();
1247	>	assertFalse(lock.hasQueuedThreads());
1248	>	t1.start();
1249	>	waitForQueuedThread(lock, t1);
1250	>	assertTrue(lock.hasQueuedThreads());
1251	>	t2.start();
1252	>	waitForQueuedThread(lock, t2);
1253	>	assertTrue(lock.hasQueuedThreads());
1254	>	t1.interrupt();
1255	>	awaitTermination(t1);
1256	>	assertTrue(lock.hasQueuedThreads());
1257	>	lock.writeLock().unlock();
1258	>	awaitTermination(t2);
1259	>	assertFalse(lock.hasQueuedThreads());
1260	>	}
1261	>
1262	>	/**
1263	>	* hasQueuedThread(null) throws NPE
1264	>	*/
1265	>	public void testHasQueuedThreadNPE()      { testHasQueuedThreadNPE(false); }
1266	>	public void testHasQueuedThreadNPE_fair() { testHasQueuedThreadNPE(true); }
1267	>	public void testHasQueuedThreadNPE(boolean fair) {
1268	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1269	>	try {
1270	>	lock.hasQueuedThread(null);
1271	>	shouldThrow();
1272	>	} catch (NullPointerException success) {}
1273	>	}
1274	>
1275	>	/**
1276	>	* hasQueuedThread reports whether a thread is queued
1277	>	*/
1278	>	public void testHasQueuedThread()      { testHasQueuedThread(false); }
1279	>	public void testHasQueuedThread_fair() { testHasQueuedThread(true); }
1280	>	public void testHasQueuedThread(boolean fair) {
1281	>	final PublicReentrantReadWriteLock lock =
1282	>	new PublicReentrantReadWriteLock(fair);
1283	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1284	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1285	>	assertFalse(lock.hasQueuedThread(t1));
1286	>	assertFalse(lock.hasQueuedThread(t2));
1287	>	lock.writeLock().lock();
1288	>	t1.start();
1289	>	waitForQueuedThread(lock, t1);
1290	>	assertTrue(lock.hasQueuedThread(t1));
1291	>	assertFalse(lock.hasQueuedThread(t2));
1292	>	t2.start();
1293	>	waitForQueuedThread(lock, t2);
1294	>	assertTrue(lock.hasQueuedThread(t1));
1295	>	assertTrue(lock.hasQueuedThread(t2));
1296	>	t1.interrupt();
1297	>	awaitTermination(t1);
1298	>	assertFalse(lock.hasQueuedThread(t1));
1299	>	assertTrue(lock.hasQueuedThread(t2));
1300	>	lock.writeLock().unlock();
1301	>	awaitTermination(t2);
1302	>	assertFalse(lock.hasQueuedThread(t1));
1303	>	assertFalse(lock.hasQueuedThread(t2));
1304	>	}
1305	>
1306	>	/**
1307	>	* getQueueLength reports number of waiting threads
1308	>	*/
1309	>	public void testGetQueueLength()      { testGetQueueLength(false); }
1310	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
1311	>	public void testGetQueueLength(boolean fair) {
1312	>	final PublicReentrantReadWriteLock lock =
1313	>	new PublicReentrantReadWriteLock(fair);
1314	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1315	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1316	>	assertEquals(0, lock.getQueueLength());
1317	>	lock.writeLock().lock();
1318	>	t1.start();
1319	>	waitForQueuedThread(lock, t1);
1320	>	assertEquals(1, lock.getQueueLength());
1321	>	t2.start();
1322	>	waitForQueuedThread(lock, t2);
1323	>	assertEquals(2, lock.getQueueLength());
1324	>	t1.interrupt();
1325	>	awaitTermination(t1);
1326	>	assertEquals(1, lock.getQueueLength());
1327	>	lock.writeLock().unlock();
1328	>	awaitTermination(t2);
1329	>	assertEquals(0, lock.getQueueLength());
1330	>	}
1331	>
1332	>	/**
1333	>	* getQueuedThreads includes waiting threads
1334	>	*/
1335	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
1336	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
1337	>	public void testGetQueuedThreads(boolean fair) {
1338	>	final PublicReentrantReadWriteLock lock =
1339	>	new PublicReentrantReadWriteLock(fair);
1340	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1341	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1342	>	assertTrue(lock.getQueuedThreads().isEmpty());
1343	>	lock.writeLock().lock();
1344	>	assertTrue(lock.getQueuedThreads().isEmpty());
1345	>	t1.start();
1346	>	waitForQueuedThread(lock, t1);
1347	>	assertEquals(1, lock.getQueuedThreads().size());
1348	>	assertTrue(lock.getQueuedThreads().contains(t1));
1349	>	t2.start();
1350	>	waitForQueuedThread(lock, t2);
1351	>	assertEquals(2, lock.getQueuedThreads().size());
1352	>	assertTrue(lock.getQueuedThreads().contains(t1));
1353	>	assertTrue(lock.getQueuedThreads().contains(t2));
1354	>	t1.interrupt();
1355	>	awaitTermination(t1);
1356	>	assertFalse(lock.getQueuedThreads().contains(t1));
1357	>	assertTrue(lock.getQueuedThreads().contains(t2));
1358	>	assertEquals(1, lock.getQueuedThreads().size());
1359	>	lock.writeLock().unlock();
1360	>	awaitTermination(t2);
1361	>	assertTrue(lock.getQueuedThreads().isEmpty());
1362	>	}
1363	>
1364	>	/**
1365	>	* hasWaiters throws NPE if null
1366	>	*/
1367	>	public void testHasWaitersNPE()      { testHasWaitersNPE(false); }
1368	>	public void testHasWaitersNPE_fair() { testHasWaitersNPE(true); }
1369	>	public void testHasWaitersNPE(boolean fair) {
1370	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1371	>	try {
1372	>	lock.hasWaiters(null);
1373	>	shouldThrow();
1374	>	} catch (NullPointerException success) {}
1375	>	}
1376	>
1377	>	/**
1378	>	* getWaitQueueLength throws NPE if null
1379	>	*/
1380	>	public void testGetWaitQueueLengthNPE()      { testGetWaitQueueLengthNPE(false); }
1381	>	public void testGetWaitQueueLengthNPE_fair() { testGetWaitQueueLengthNPE(true); }
1382	>	public void testGetWaitQueueLengthNPE(boolean fair) {
1383	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1384	>	try {
1385	>	lock.getWaitQueueLength(null);
1386	>	shouldThrow();
1387	>	} catch (NullPointerException success) {}
1388	>	}
1389	>
1390	>	/**
1391	>	* getWaitingThreads throws NPE if null
1392	>	*/
1393	>	public void testGetWaitingThreadsNPE()      { testGetWaitingThreadsNPE(false); }
1394	>	public void testGetWaitingThreadsNPE_fair() { testGetWaitingThreadsNPE(true); }
1395	>	public void testGetWaitingThreadsNPE(boolean fair) {
1396	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(fair);
1397	>	try {
1398	>	lock.getWaitingThreads(null);
1399	>	shouldThrow();
1400	>	} catch (NullPointerException success) {}
1401	>	}
1402	>
1403	>	/**
1404	>	* hasWaiters throws IllegalArgumentException if not owned
1405	>	*/
1406	>	public void testHasWaitersIAE()      { testHasWaitersIAE(false); }
1407	>	public void testHasWaitersIAE_fair() { testHasWaitersIAE(true); }
1408	>	public void testHasWaitersIAE(boolean fair) {
1409	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1410	>	final Condition c = lock.writeLock().newCondition();
1411	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(fair);
1412	>	try {
1413	>	lock2.hasWaiters(c);
1414	>	shouldThrow();
1415	>	} catch (IllegalArgumentException success) {}
1416	>	}
1417	>
1418	>	/**
1419	>	* hasWaiters throws IllegalMonitorStateException if not locked
1420	>	*/
1421	>	public void testHasWaitersIMSE()      { testHasWaitersIMSE(false); }
1422	>	public void testHasWaitersIMSE_fair() { testHasWaitersIMSE(true); }
1423	>	public void testHasWaitersIMSE(boolean fair) {
1424	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1425	>	final Condition c = lock.writeLock().newCondition();
1426	>	try {
1427	>	lock.hasWaiters(c);
1428	>	shouldThrow();
1429	>	} catch (IllegalMonitorStateException success) {}
1430	>	}
1431	>
1432	>	/**
1433	>	* getWaitQueueLength throws IllegalArgumentException if not owned
1434	>	*/
1435	>	public void testGetWaitQueueLengthIAE()      { testGetWaitQueueLengthIAE(false); }
1436	>	public void testGetWaitQueueLengthIAE_fair() { testGetWaitQueueLengthIAE(true); }
1437	>	public void testGetWaitQueueLengthIAE(boolean fair) {
1438	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1439	>	final Condition c = lock.writeLock().newCondition();
1440	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(fair);
1441	>	try {
1442	>	lock2.getWaitQueueLength(c);
1443	>	shouldThrow();
1444	>	} catch (IllegalArgumentException success) {}
1445	>	}
1446	>
1447	>	/**
1448	>	* getWaitQueueLength throws IllegalMonitorStateException if not locked
1449	>	*/
1450	>	public void testGetWaitQueueLengthIMSE()      { testGetWaitQueueLengthIMSE(false); }
1451	>	public void testGetWaitQueueLengthIMSE_fair() { testGetWaitQueueLengthIMSE(true); }
1452	>	public void testGetWaitQueueLengthIMSE(boolean fair) {
1453	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1454	>	final Condition c = lock.writeLock().newCondition();
1455	>	try {
1456	>	lock.getWaitQueueLength(c);
1457	>	shouldThrow();
1458	>	} catch (IllegalMonitorStateException success) {}
1459	>	}
1460	>
1461	>	/**
1462	>	* getWaitingThreads throws IllegalArgumentException if not owned
1463	>	*/
1464	>	public void testGetWaitingThreadsIAE()      { testGetWaitingThreadsIAE(false); }
1465	>	public void testGetWaitingThreadsIAE_fair() { testGetWaitingThreadsIAE(true); }
1466	>	public void testGetWaitingThreadsIAE(boolean fair) {
1467	>	final PublicReentrantReadWriteLock lock =
1468	>	new PublicReentrantReadWriteLock(fair);
1469	>	final Condition c = lock.writeLock().newCondition();
1470	>	final PublicReentrantReadWriteLock lock2 =
1471	>	new PublicReentrantReadWriteLock(fair);
1472	>	try {
1473	>	lock2.getWaitingThreads(c);
1474	>	shouldThrow();
1475	>	} catch (IllegalArgumentException success) {}
1476	>	}
1477	>
1478	>	/**
1479	>	* getWaitingThreads throws IllegalMonitorStateException if not locked
1480	>	*/
1481	>	public void testGetWaitingThreadsIMSE()      { testGetWaitingThreadsIMSE(false); }
1482	>	public void testGetWaitingThreadsIMSE_fair() { testGetWaitingThreadsIMSE(true); }
1483	>	public void testGetWaitingThreadsIMSE(boolean fair) {
1484	>	final PublicReentrantReadWriteLock lock =
1485	>	new PublicReentrantReadWriteLock(fair);
1486	>	final Condition c = lock.writeLock().newCondition();
1487	>	try {
1488	>	lock.getWaitingThreads(c);
1489	>	shouldThrow();
1490	>	} catch (IllegalMonitorStateException success) {}
1491	>	}
1492	>
1493	>	/**
1494	>	* hasWaiters returns true when a thread is waiting, else false
1495	>	*/
1496	>	public void testHasWaiters()      { testHasWaiters(false); }
1497	>	public void testHasWaiters_fair() { testHasWaiters(true); }
1498	>	public void testHasWaiters(boolean fair) {
1499	>	final PublicReentrantReadWriteLock lock =
1500	>	new PublicReentrantReadWriteLock(fair);
1501	>	final Condition c = lock.writeLock().newCondition();
1502	>	final CountDownLatch locked = new CountDownLatch(1);
1503	>	Thread t = newStartedThread(new CheckedRunnable() {
1504	>	public void realRun() throws InterruptedException {
1505	>	lock.writeLock().lock();
1506	>	assertHasNoWaiters(lock, c);
1507	>	assertFalse(lock.hasWaiters(c));
1508	>	locked.countDown();
1509	>	c.await();
1510	>	assertHasNoWaiters(lock, c);
1511	>	assertFalse(lock.hasWaiters(c));
1512	>	lock.writeLock().unlock();
1513	>	}});
1514	>
1515	>	await(locked);
1516	>	lock.writeLock().lock();
1517	>	assertHasWaiters(lock, c, t);
1518	>	assertTrue(lock.hasWaiters(c));
1519	>	c.signal();
1520	>	assertHasNoWaiters(lock, c);
1521	>	assertFalse(lock.hasWaiters(c));
1522	>	lock.writeLock().unlock();
1523	>	awaitTermination(t);
1524	>	assertHasNoWaiters(lock, c);
1525	>	}
1526	>
1527	>	/**
1528	>	* getWaitQueueLength returns number of waiting threads
1529	>	*/
1530	>	public void testGetWaitQueueLength()      { testGetWaitQueueLength(false); }
1531	>	public void testGetWaitQueueLength_fair() { testGetWaitQueueLength(true); }
1532	>	public void testGetWaitQueueLength(boolean fair) {
1533	>	final PublicReentrantReadWriteLock lock =
1534	>	new PublicReentrantReadWriteLock(fair);
1535	>	final Condition c = lock.writeLock().newCondition();
1536	>	final CountDownLatch locked = new CountDownLatch(1);
1537	>	Thread t = newStartedThread(new CheckedRunnable() {
1538	>	public void realRun() throws InterruptedException {
1539	>	lock.writeLock().lock();
1540	>	assertEquals(0, lock.getWaitQueueLength(c));
1541	>	locked.countDown();
1542	>	c.await();
1543	>	lock.writeLock().unlock();
1544	>	}});
1545	>
1546	>	await(locked);
1547	>	lock.writeLock().lock();
1548	>	assertHasWaiters(lock, c, t);
1549	>	assertEquals(1, lock.getWaitQueueLength(c));
1550	>	c.signal();
1551	>	assertHasNoWaiters(lock, c);
1552	>	assertEquals(0, lock.getWaitQueueLength(c));
1553	>	lock.writeLock().unlock();
1554	>	awaitTermination(t);
1555	>	}
1556	>
1557	>	/**
1558	>	* getWaitingThreads returns only and all waiting threads
1559	>	*/
1560	>	public void testGetWaitingThreads()      { testGetWaitingThreads(false); }
1561	>	public void testGetWaitingThreads_fair() { testGetWaitingThreads(true); }
1562	>	public void testGetWaitingThreads(boolean fair) {
1563	>	final PublicReentrantReadWriteLock lock =
1564	>	new PublicReentrantReadWriteLock(fair);
1565	>	final Condition c = lock.writeLock().newCondition();
1566	>	final CountDownLatch locked1 = new CountDownLatch(1);
1567	>	final CountDownLatch locked2 = new CountDownLatch(1);
1568	>	Thread t1 = new Thread(new CheckedRunnable() {
1569	>	public void realRun() throws InterruptedException {
1570	>	lock.writeLock().lock();
1571	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1572	>	locked1.countDown();
1573	>	c.await();
1574	>	lock.writeLock().unlock();
1575	>	}});
1576	>
1577	>	Thread t2 = new Thread(new CheckedRunnable() {
1578	>	public void realRun() throws InterruptedException {
1579	>	lock.writeLock().lock();
1580	>	assertFalse(lock.getWaitingThreads(c).isEmpty());
1581	>	locked2.countDown();
1582	>	c.await();
1583	>	lock.writeLock().unlock();
1584	>	}});
1585	>
1586	>	lock.writeLock().lock();
1587	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1588	>	lock.writeLock().unlock();
1589	>
1590	>	t1.start();
1591	>	await(locked1);
1592	>	t2.start();
1593	>	await(locked2);
1594	>
1595	>	lock.writeLock().lock();
1596	>	assertTrue(lock.hasWaiters(c));
1597	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
1598	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
1599	>	assertEquals(2, lock.getWaitingThreads(c).size());
1600	>	c.signalAll();
1601	>	assertHasNoWaiters(lock, c);
1602	>	lock.writeLock().unlock();
1603	>
1604	>	awaitTermination(t1);
1605	>	awaitTermination(t2);
1606	>
1607	>	assertHasNoWaiters(lock, c);
1608	>	}
1609	>
1610	>	/**
1611	>	* toString indicates current lock state
1612	>	*/
1613	>	public void testToString()      { testToString(false); }
1614	>	public void testToString_fair() { testToString(true); }
1615	>	public void testToString(boolean fair) {
1616	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1617	>	assertTrue(lock.toString().contains("Write locks = 0"));
1618	>	assertTrue(lock.toString().contains("Read locks = 0"));
1619	>	lock.writeLock().lock();
1620	>	assertTrue(lock.toString().contains("Write locks = 1"));
1621	>	assertTrue(lock.toString().contains("Read locks = 0"));
1622	>	lock.writeLock().unlock();
1623	>	lock.readLock().lock();
1624	>	lock.readLock().lock();
1625	>	assertTrue(lock.toString().contains("Write locks = 0"));
1626	>	assertTrue(lock.toString().contains("Read locks = 2"));
1627	>	}
1628	>
1629	>	/**
1630	>	* readLock.toString indicates current lock state
1631	>	*/
1632	>	public void testReadLockToString()      { testReadLockToString(false); }
1633	>	public void testReadLockToString_fair() { testReadLockToString(true); }
1634	>	public void testReadLockToString(boolean fair) {
1635	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1636	>	assertTrue(lock.readLock().toString().contains("Read locks = 0"));
1637	>	lock.readLock().lock();
1638	>	lock.readLock().lock();
1639	>	assertTrue(lock.readLock().toString().contains("Read locks = 2"));
1640	>	}
1641	>
1642	>	/**
1643	>	* writeLock.toString indicates current lock state
1644	>	*/
1645	>	public void testWriteLockToString()      { testWriteLockToString(false); }
1646	>	public void testWriteLockToString_fair() { testWriteLockToString(true); }
1647	>	public void testWriteLockToString(boolean fair) {
1648	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1649	>	assertTrue(lock.writeLock().toString().contains("Unlocked"));
1650	>	lock.writeLock().lock();
1651	>	assertTrue(lock.writeLock().toString().contains("Locked"));
1652	>	lock.writeLock().unlock();
1653	>	assertTrue(lock.writeLock().toString().contains("Unlocked"));
1654		}
112	–
1655
1656		}

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