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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 1.70 by jsr166, Wed Dec 31 20:34:16 2014 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
2	>	* Written by Doug Lea with assistance from members of JCP JSR-166
3	>	* Expert Group and released to the public domain, as explained at
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9	<	import junit.framework.*;
10	<	import java.util.concurrent.locks.*;
11	<	import java.util.concurrent.*;
12	<
13	<	public class ReentrantReadWriteLockTest extends TestCase {
14	<	static int HOLD_COUNT_TEST_LIMIT = 20;
15	<
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	>	public class ReentrantReadWriteLockTest extends JSR166TestCase {
25		public static void main(String[] args) {
26	<	junit.textui.TestRunner.run (suite());
26	>	junit.textui.TestRunner.run(suite());
27		}
18	–
28		public static Test suite() {
29	<	return new TestSuite(ReentrantReadWriteLockTest.class);
29	>	return new TestSuite(ReentrantReadWriteLockTest.class);
30	>	}
31	>
32	>	/**
33	>	* A runnable calling lockInterruptibly
34	>	*/
35	>	class InterruptibleLockRunnable extends CheckedRunnable {
36	>	final ReentrantReadWriteLock lock;
37	>	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
38	>	public void realRun() throws InterruptedException {
39	>	lock.writeLock().lockInterruptibly();
40	>	}
41	>	}
42	>
43	>	/**
44	>	* A runnable calling lockInterruptibly that expects to be
45	>	* interrupted
46	>	*/
47	>	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
48	>	final ReentrantReadWriteLock lock;
49	>	InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
50	>	public void realRun() throws InterruptedException {
51	>	lock.writeLock().lockInterruptibly();
52	>	}
53	>	}
54	>
55	>	/**
56	>	* Subclass to expose protected methods
57	>	*/
58	>	static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
59	>	PublicReentrantReadWriteLock() { super(); }
60	>	PublicReentrantReadWriteLock(boolean fair) { super(fair); }
61	>	public Thread getOwner() {
62	>	return super.getOwner();
63	>	}
64	>	public Collection<Thread> getQueuedThreads() {
65	>	return super.getQueuedThreads();
66	>	}
67	>	public Collection<Thread> getWaitingThreads(Condition c) {
68	>	return super.getWaitingThreads(c);
69	>	}
70	>	}
71	>
72	>	/**
73	>	* Releases write lock, checking that it had a hold count of 1.
74	>	*/
75	>	void releaseWriteLock(PublicReentrantReadWriteLock lock) {
76	>	ReentrantReadWriteLock.WriteLock writeLock = lock.writeLock();
77	>	assertWriteLockedByMoi(lock);
78	>	assertEquals(1, lock.getWriteHoldCount());
79	>	writeLock.unlock();
80	>	assertNotWriteLocked(lock);
81	>	}
82	>
83	>	/**
84	>	* Spin-waits until lock.hasQueuedThread(t) becomes true.
85	>	*/
86	>	void waitForQueuedThread(PublicReentrantReadWriteLock lock, Thread t) {
87	>	long startTime = System.nanoTime();
88	>	while (!lock.hasQueuedThread(t)) {
89	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
90	>	throw new AssertionFailedError("timed out");
91	>	Thread.yield();
92	>	}
93	>	assertTrue(t.isAlive());
94	>	assertNotSame(t, lock.getOwner());
95	>	}
96	>
97	>	/**
98	>	* Checks that lock is not write-locked.
99	>	*/
100	>	void assertNotWriteLocked(PublicReentrantReadWriteLock lock) {
101	>	assertFalse(lock.isWriteLocked());
102	>	assertFalse(lock.isWriteLockedByCurrentThread());
103	>	assertFalse(lock.writeLock().isHeldByCurrentThread());
104	>	assertEquals(0, lock.getWriteHoldCount());
105	>	assertEquals(0, lock.writeLock().getHoldCount());
106	>	assertNull(lock.getOwner());
107	>	}
108	>
109	>	/**
110	>	* Checks that lock is write-locked by the given thread.
111	>	*/
112	>	void assertWriteLockedBy(PublicReentrantReadWriteLock lock, Thread t) {
113	>	assertTrue(lock.isWriteLocked());
114	>	assertSame(t, lock.getOwner());
115	>	assertEquals(t == Thread.currentThread(),
116	>	lock.isWriteLockedByCurrentThread());
117	>	assertEquals(t == Thread.currentThread(),
118	>	lock.writeLock().isHeldByCurrentThread());
119	>	assertEquals(t == Thread.currentThread(),
120	>	lock.getWriteHoldCount() > 0);
121	>	assertEquals(t == Thread.currentThread(),
122	>	lock.writeLock().getHoldCount() > 0);
123	>	assertEquals(0, lock.getReadLockCount());
124	>	}
125	>
126	>	/**
127	>	* Checks that lock is write-locked by the current thread.
128	>	*/
129	>	void assertWriteLockedByMoi(PublicReentrantReadWriteLock lock) {
130	>	assertWriteLockedBy(lock, Thread.currentThread());
131	>	}
132	>
133	>	/**
134	>	* Checks that condition c has no waiters.
135	>	*/
136	>	void assertHasNoWaiters(PublicReentrantReadWriteLock lock, Condition c) {
137	>	assertHasWaiters(lock, c, new Thread[] {});
138	>	}
139	>
140	>	/**
141	>	* Checks that condition c has exactly the given waiter threads.
142	>	*/
143	>	void assertHasWaiters(PublicReentrantReadWriteLock lock, Condition c,
144	>	Thread... threads) {
145	>	lock.writeLock().lock();
146	>	assertEquals(threads.length > 0, lock.hasWaiters(c));
147	>	assertEquals(threads.length, lock.getWaitQueueLength(c));
148	>	assertEquals(threads.length == 0, lock.getWaitingThreads(c).isEmpty());
149	>	assertEquals(threads.length, lock.getWaitingThreads(c).size());
150	>	assertEquals(new HashSet<Thread>(lock.getWaitingThreads(c)),
151	>	new HashSet<Thread>(Arrays.asList(threads)));
152	>	lock.writeLock().unlock();
153	>	}
154	>
155	>	enum AwaitMethod { await, awaitTimed, awaitNanos, awaitUntil }
156	>
157	>	/**
158	>	* Awaits condition using the specified AwaitMethod.
159	>	*/
160	>	void await(Condition c, AwaitMethod awaitMethod)
161	>	throws InterruptedException {
162	>	switch (awaitMethod) {
163	>	case await:
164	>	c.await();
165	>	break;
166	>	case awaitTimed:
167	>	assertTrue(c.await(2 * LONG_DELAY_MS, MILLISECONDS));
168	>	break;
169	>	case awaitNanos:
170	>	long nanosRemaining = c.awaitNanos(MILLISECONDS.toNanos(2 * LONG_DELAY_MS));
171	>	assertTrue(nanosRemaining > 0);
172	>	break;
173	>	case awaitUntil:
174	>	java.util.Date d = new java.util.Date();
175	>	assertTrue(c.awaitUntil(new java.util.Date(d.getTime() + 2 * LONG_DELAY_MS)));
176	>	break;
177	>	default:
178	>	throw new AssertionError();
179	>	}
180	>	}
181	>
182	>	/**
183	>	* Constructor sets given fairness, and is in unlocked state
184	>	*/
185	>	public void testConstructor() {
186	>	PublicReentrantReadWriteLock lock;
187	>
188	>	lock = new PublicReentrantReadWriteLock();
189	>	assertFalse(lock.isFair());
190	>	assertNotWriteLocked(lock);
191	>	assertEquals(0, lock.getReadLockCount());
192	>
193	>	lock = new PublicReentrantReadWriteLock(true);
194	>	assertTrue(lock.isFair());
195	>	assertNotWriteLocked(lock);
196	>	assertEquals(0, lock.getReadLockCount());
197	>
198	>	lock = new PublicReentrantReadWriteLock(false);
199	>	assertFalse(lock.isFair());
200	>	assertNotWriteLocked(lock);
201	>	assertEquals(0, lock.getReadLockCount());
202	>	}
203	>
204	>	/**
205	>	* write-locking and read-locking an unlocked lock succeed
206	>	*/
207	>	public void testLock()      { testLock(false); }
208	>	public void testLock_fair() { testLock(true); }
209	>	public void testLock(boolean fair) {
210	>	PublicReentrantReadWriteLock lock =
211	>	new PublicReentrantReadWriteLock(fair);
212	>	assertNotWriteLocked(lock);
213	>	lock.writeLock().lock();
214	>	assertWriteLockedByMoi(lock);
215	>	lock.writeLock().unlock();
216	>	assertNotWriteLocked(lock);
217	>	assertEquals(0, lock.getReadLockCount());
218	>	lock.readLock().lock();
219	>	assertNotWriteLocked(lock);
220	>	assertEquals(1, lock.getReadLockCount());
221	>	lock.readLock().unlock();
222	>	assertNotWriteLocked(lock);
223	>	assertEquals(0, lock.getReadLockCount());
224	>	}
225	>
226	>	/**
227	>	* getWriteHoldCount returns number of recursive holds
228	>	*/
229	>	public void testGetWriteHoldCount()      { testGetWriteHoldCount(false); }
230	>	public void testGetWriteHoldCount_fair() { testGetWriteHoldCount(true); }
231	>	public void testGetWriteHoldCount(boolean fair) {
232	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
233	>	for (int i = 1; i <= SIZE; i++) {
234	>	lock.writeLock().lock();
235	>	assertEquals(i,lock.getWriteHoldCount());
236	>	}
237	>	for (int i = SIZE; i > 0; i--) {
238	>	lock.writeLock().unlock();
239	>	assertEquals(i-1,lock.getWriteHoldCount());
240	>	}
241	>	}
242	>
243	>	/**
244	>	* writelock.getHoldCount returns number of recursive holds
245	>	*/
246	>	public void testGetHoldCount()      { testGetHoldCount(false); }
247	>	public void testGetHoldCount_fair() { testGetHoldCount(true); }
248	>	public void testGetHoldCount(boolean fair) {
249	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
250	>	for (int i = 1; i <= SIZE; i++) {
251	>	lock.writeLock().lock();
252	>	assertEquals(i,lock.writeLock().getHoldCount());
253	>	}
254	>	for (int i = SIZE; i > 0; i--) {
255	>	lock.writeLock().unlock();
256	>	assertEquals(i-1,lock.writeLock().getHoldCount());
257	>	}
258	>	}
259	>
260	>	/**
261	>	* getReadHoldCount returns number of recursive holds
262	>	*/
263	>	public void testGetReadHoldCount()      { testGetReadHoldCount(false); }
264	>	public void testGetReadHoldCount_fair() { testGetReadHoldCount(true); }
265	>	public void testGetReadHoldCount(boolean fair) {
266	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
267	>	for (int i = 1; i <= SIZE; i++) {
268	>	lock.readLock().lock();
269	>	assertEquals(i,lock.getReadHoldCount());
270	>	}
271	>	for (int i = SIZE; i > 0; i--) {
272	>	lock.readLock().unlock();
273	>	assertEquals(i-1,lock.getReadHoldCount());
274	>	}
275	>	}
276	>
277	>	/**
278	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
279	>	*/
280	>	public void testWriteUnlock_IMSE()      { testWriteUnlock_IMSE(false); }
281	>	public void testWriteUnlock_IMSE_fair() { testWriteUnlock_IMSE(true); }
282	>	public void testWriteUnlock_IMSE(boolean fair) {
283	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
284	>	try {
285	>	lock.writeLock().unlock();
286	>	shouldThrow();
287	>	} catch (IllegalMonitorStateException success) {}
288	>	}
289	>
290	>	/**
291	>	* read-unlocking an unlocked lock throws IllegalMonitorStateException
292	>	*/
293	>	public void testReadUnlock_IMSE()      { testReadUnlock_IMSE(false); }
294	>	public void testReadUnlock_IMSE_fair() { testReadUnlock_IMSE(true); }
295	>	public void testReadUnlock_IMSE(boolean fair) {
296	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
297	>	try {
298	>	lock.readLock().unlock();
299	>	shouldThrow();
300	>	} catch (IllegalMonitorStateException success) {}
301	>	}
302	>
303	>	/**
304	>	* write-lockInterruptibly is interruptible
305	>	*/
306	>	public void testWriteLockInterruptibly_Interruptible()      { testWriteLockInterruptibly_Interruptible(false); }
307	>	public void testWriteLockInterruptibly_Interruptible_fair() { testWriteLockInterruptibly_Interruptible(true); }
308	>	public void testWriteLockInterruptibly_Interruptible(boolean fair) {
309	>	final PublicReentrantReadWriteLock lock =
310	>	new PublicReentrantReadWriteLock(fair);
311	>	lock.writeLock().lock();
312	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
313	>	public void realRun() throws InterruptedException {
314	>	lock.writeLock().lockInterruptibly();
315	>	}});
316	>
317	>	waitForQueuedThread(lock, t);
318	>	t.interrupt();
319	>	awaitTermination(t);
320	>	releaseWriteLock(lock);
321	>	}
322	>
323	>	/**
324	>	* timed write-tryLock is interruptible
325	>	*/
326	>	public void testWriteTryLock_Interruptible()      { testWriteTryLock_Interruptible(false); }
327	>	public void testWriteTryLock_Interruptible_fair() { testWriteTryLock_Interruptible(true); }
328	>	public void testWriteTryLock_Interruptible(boolean fair) {
329	>	final PublicReentrantReadWriteLock lock =
330	>	new PublicReentrantReadWriteLock(fair);
331	>	lock.writeLock().lock();
332	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
333	>	public void realRun() throws InterruptedException {
334	>	lock.writeLock().tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
335	>	}});
336	>
337	>	waitForQueuedThread(lock, t);
338	>	t.interrupt();
339	>	awaitTermination(t);
340	>	releaseWriteLock(lock);
341	>	}
342	>
343	>	/**
344	>	* read-lockInterruptibly is interruptible
345	>	*/
346	>	public void testReadLockInterruptibly_Interruptible()      { testReadLockInterruptibly_Interruptible(false); }
347	>	public void testReadLockInterruptibly_Interruptible_fair() { testReadLockInterruptibly_Interruptible(true); }
348	>	public void testReadLockInterruptibly_Interruptible(boolean fair) {
349	>	final PublicReentrantReadWriteLock lock =
350	>	new PublicReentrantReadWriteLock(fair);
351	>	lock.writeLock().lock();
352	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
353	>	public void realRun() throws InterruptedException {
354	>	lock.readLock().lockInterruptibly();
355	>	}});
356	>
357	>	waitForQueuedThread(lock, t);
358	>	t.interrupt();
359	>	awaitTermination(t);
360	>	releaseWriteLock(lock);
361	>	}
362	>
363	>	/**
364	>	* timed read-tryLock is interruptible
365	>	*/
366	>	public void testReadTryLock_Interruptible()      { testReadTryLock_Interruptible(false); }
367	>	public void testReadTryLock_Interruptible_fair() { testReadTryLock_Interruptible(true); }
368	>	public void testReadTryLock_Interruptible(boolean fair) {
369	>	final PublicReentrantReadWriteLock lock =
370	>	new PublicReentrantReadWriteLock(fair);
371	>	lock.writeLock().lock();
372	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
373	>	public void realRun() throws InterruptedException {
374	>	lock.readLock().tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
375	>	}});
376	>
377	>	waitForQueuedThread(lock, t);
378	>	t.interrupt();
379	>	awaitTermination(t);
380	>	releaseWriteLock(lock);
381	>	}
382	>
383	>	/**
384	>	* write-tryLock on an unlocked lock succeeds
385	>	*/
386	>	public void testWriteTryLock()      { testWriteTryLock(false); }
387	>	public void testWriteTryLock_fair() { testWriteTryLock(true); }
388	>	public void testWriteTryLock(boolean fair) {
389	>	final PublicReentrantReadWriteLock lock =
390	>	new PublicReentrantReadWriteLock(fair);
391	>	assertTrue(lock.writeLock().tryLock());
392	>	assertWriteLockedByMoi(lock);
393	>	assertTrue(lock.writeLock().tryLock());
394	>	assertWriteLockedByMoi(lock);
395	>	lock.writeLock().unlock();
396	>	releaseWriteLock(lock);
397	>	}
398	>
399	>	/**
400	>	* write-tryLock fails if locked
401	>	*/
402	>	public void testWriteTryLockWhenLocked()      { testWriteTryLockWhenLocked(false); }
403	>	public void testWriteTryLockWhenLocked_fair() { testWriteTryLockWhenLocked(true); }
404	>	public void testWriteTryLockWhenLocked(boolean fair) {
405	>	final PublicReentrantReadWriteLock lock =
406	>	new PublicReentrantReadWriteLock(fair);
407	>	lock.writeLock().lock();
408	>	Thread t = newStartedThread(new CheckedRunnable() {
409	>	public void realRun() {
410	>	assertFalse(lock.writeLock().tryLock());
411	>	}});
412	>
413	>	awaitTermination(t);
414	>	releaseWriteLock(lock);
415	>	}
416	>
417	>	/**
418	>	* read-tryLock fails if locked
419	>	*/
420	>	public void testReadTryLockWhenLocked()      { testReadTryLockWhenLocked(false); }
421	>	public void testReadTryLockWhenLocked_fair() { testReadTryLockWhenLocked(true); }
422	>	public void testReadTryLockWhenLocked(boolean fair) {
423	>	final PublicReentrantReadWriteLock lock =
424	>	new PublicReentrantReadWriteLock(fair);
425	>	lock.writeLock().lock();
426	>	Thread t = newStartedThread(new CheckedRunnable() {
427	>	public void realRun() {
428	>	assertFalse(lock.readLock().tryLock());
429	>	}});
430	>
431	>	awaitTermination(t);
432	>	releaseWriteLock(lock);
433	>	}
434	>
435	>	/**
436	>	* Multiple threads can hold a read lock when not write-locked
437	>	*/
438	>	public void testMultipleReadLocks()      { testMultipleReadLocks(false); }
439	>	public void testMultipleReadLocks_fair() { testMultipleReadLocks(true); }
440	>	public void testMultipleReadLocks(boolean fair) {
441	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
442	>	lock.readLock().lock();
443	>	Thread t = newStartedThread(new CheckedRunnable() {
444	>	public void realRun() throws InterruptedException {
445	>	assertTrue(lock.readLock().tryLock());
446	>	lock.readLock().unlock();
447	>	assertTrue(lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS));
448	>	lock.readLock().unlock();
449	>	lock.readLock().lock();
450	>	lock.readLock().unlock();
451	>	}});
452	>
453	>	awaitTermination(t);
454	>	lock.readLock().unlock();
455	>	}
456	>
457	>	/**
458	>	* A writelock succeeds only after a reading thread unlocks
459	>	*/
460	>	public void testWriteAfterReadLock()      { testWriteAfterReadLock(false); }
461	>	public void testWriteAfterReadLock_fair() { testWriteAfterReadLock(true); }
462	>	public void testWriteAfterReadLock(boolean fair) {
463	>	final PublicReentrantReadWriteLock lock =
464	>	new PublicReentrantReadWriteLock(fair);
465	>	lock.readLock().lock();
466	>	Thread t = newStartedThread(new CheckedRunnable() {
467	>	public void realRun() {
468	>	assertEquals(1, lock.getReadLockCount());
469	>	lock.writeLock().lock();
470	>	assertEquals(0, lock.getReadLockCount());
471	>	lock.writeLock().unlock();
472	>	}});
473	>	waitForQueuedThread(lock, t);
474	>	assertNotWriteLocked(lock);
475	>	assertEquals(1, lock.getReadLockCount());
476	>	lock.readLock().unlock();
477	>	assertEquals(0, lock.getReadLockCount());
478	>	awaitTermination(t);
479	>	assertNotWriteLocked(lock);
480	>	}
481	>
482	>	/**
483	>	* A writelock succeeds only after reading threads unlock
484	>	*/
485	>	public void testWriteAfterMultipleReadLocks()      { testWriteAfterMultipleReadLocks(false); }
486	>	public void testWriteAfterMultipleReadLocks_fair() { testWriteAfterMultipleReadLocks(true); }
487	>	public void testWriteAfterMultipleReadLocks(boolean fair) {
488	>	final PublicReentrantReadWriteLock lock =
489	>	new PublicReentrantReadWriteLock(fair);
490	>	lock.readLock().lock();
491	>	lock.readLock().lock();
492	>	Thread t1 = newStartedThread(new CheckedRunnable() {
493	>	public void realRun() {
494	>	lock.readLock().lock();
495	>	assertEquals(3, lock.getReadLockCount());
496	>	lock.readLock().unlock();
497	>	}});
498	>	awaitTermination(t1);
499	>
500	>	Thread t2 = newStartedThread(new CheckedRunnable() {
501	>	public void realRun() {
502	>	assertEquals(2, lock.getReadLockCount());
503	>	lock.writeLock().lock();
504	>	assertEquals(0, lock.getReadLockCount());
505	>	lock.writeLock().unlock();
506	>	}});
507	>	waitForQueuedThread(lock, t2);
508	>	assertNotWriteLocked(lock);
509	>	assertEquals(2, lock.getReadLockCount());
510	>	lock.readLock().unlock();
511	>	lock.readLock().unlock();
512	>	assertEquals(0, lock.getReadLockCount());
513	>	awaitTermination(t2);
514	>	assertNotWriteLocked(lock);
515	>	}
516	>
517	>	/**
518	>	* A thread that tries to acquire a fair read lock (non-reentrantly)
519	>	* will block if there is a waiting writer thread
520	>	*/
521	>	public void testReaderWriterReaderFairFifo() {
522	>	final PublicReentrantReadWriteLock lock =
523	>	new PublicReentrantReadWriteLock(true);
524	>	final AtomicBoolean t1GotLock = new AtomicBoolean(false);
525	>
526	>	lock.readLock().lock();
527	>	Thread t1 = newStartedThread(new CheckedRunnable() {
528	>	public void realRun() {
529	>	assertEquals(1, lock.getReadLockCount());
530	>	lock.writeLock().lock();
531	>	assertEquals(0, lock.getReadLockCount());
532	>	t1GotLock.set(true);
533	>	lock.writeLock().unlock();
534	>	}});
535	>	waitForQueuedThread(lock, t1);
536	>
537	>	Thread t2 = newStartedThread(new CheckedRunnable() {
538	>	public void realRun() {
539	>	assertEquals(1, lock.getReadLockCount());
540	>	lock.readLock().lock();
541	>	assertEquals(1, lock.getReadLockCount());
542	>	assertTrue(t1GotLock.get());
543	>	lock.readLock().unlock();
544	>	}});
545	>	waitForQueuedThread(lock, t2);
546	>	assertTrue(t1.isAlive());
547	>	assertNotWriteLocked(lock);
548	>	assertEquals(1, lock.getReadLockCount());
549	>	lock.readLock().unlock();
550	>	awaitTermination(t1);
551	>	awaitTermination(t2);
552	>	assertNotWriteLocked(lock);
553	>	}
554	>
555	>	/**
556	>	* Readlocks succeed only after a writing thread unlocks
557	>	*/
558	>	public void testReadAfterWriteLock()      { testReadAfterWriteLock(false); }
559	>	public void testReadAfterWriteLock_fair() { testReadAfterWriteLock(true); }
560	>	public void testReadAfterWriteLock(boolean fair) {
561	>	final PublicReentrantReadWriteLock lock =
562	>	new PublicReentrantReadWriteLock(fair);
563	>	lock.writeLock().lock();
564	>	Thread t1 = newStartedThread(new CheckedRunnable() {
565	>	public void realRun() {
566	>	lock.readLock().lock();
567	>	lock.readLock().unlock();
568	>	}});
569	>	Thread t2 = newStartedThread(new CheckedRunnable() {
570	>	public void realRun() {
571	>	lock.readLock().lock();
572	>	lock.readLock().unlock();
573	>	}});
574	>
575	>	waitForQueuedThread(lock, t1);
576	>	waitForQueuedThread(lock, t2);
577	>	releaseWriteLock(lock);
578	>	awaitTermination(t1);
579	>	awaitTermination(t2);
580	>	}
581	>
582	>	/**
583	>	* Read trylock succeeds if write locked by current thread
584	>	*/
585	>	public void testReadHoldingWriteLock()      { testReadHoldingWriteLock(false); }
586	>	public void testReadHoldingWriteLock_fair() { testReadHoldingWriteLock(true); }
587	>	public void testReadHoldingWriteLock(boolean fair) {
588	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
589	>	lock.writeLock().lock();
590	>	assertTrue(lock.readLock().tryLock());
591	>	lock.readLock().unlock();
592	>	lock.writeLock().unlock();
593	>	}
594	>
595	>	/**
596	>	* Read trylock succeeds (barging) even in the presence of waiting
597	>	* readers and/or writers
598	>	*/
599	>	public void testReadTryLockBarging()      { testReadTryLockBarging(false); }
600	>	public void testReadTryLockBarging_fair() { testReadTryLockBarging(true); }
601	>	public void testReadTryLockBarging(boolean fair) {
602	>	final PublicReentrantReadWriteLock lock =
603	>	new PublicReentrantReadWriteLock(fair);
604	>	lock.readLock().lock();
605	>
606	>	Thread t1 = newStartedThread(new CheckedRunnable() {
607	>	public void realRun() {
608	>	lock.writeLock().lock();
609	>	lock.writeLock().unlock();
610	>	}});
611	>
612	>	waitForQueuedThread(lock, t1);
613	>
614	>	Thread t2 = newStartedThread(new CheckedRunnable() {
615	>	public void realRun() {
616	>	lock.readLock().lock();
617	>	lock.readLock().unlock();
618	>	}});
619	>
620	>	if (fair)
621	>	waitForQueuedThread(lock, t2);
622	>
623	>	Thread t3 = newStartedThread(new CheckedRunnable() {
624	>	public void realRun() {
625	>	lock.readLock().tryLock();
626	>	lock.readLock().unlock();
627	>	}});
628	>
629	>	assertTrue(lock.getReadLockCount() > 0);
630	>	awaitTermination(t3);
631	>	assertTrue(t1.isAlive());
632	>	if (fair) assertTrue(t2.isAlive());
633	>	lock.readLock().unlock();
634	>	awaitTermination(t1);
635	>	awaitTermination(t2);
636	>	}
637	>
638	>	/**
639	>	* Read lock succeeds if write locked by current thread even if
640	>	* other threads are waiting for readlock
641	>	*/
642	>	public void testReadHoldingWriteLock2()      { testReadHoldingWriteLock2(false); }
643	>	public void testReadHoldingWriteLock2_fair() { testReadHoldingWriteLock2(true); }
644	>	public void testReadHoldingWriteLock2(boolean fair) {
645	>	final PublicReentrantReadWriteLock lock =
646	>	new PublicReentrantReadWriteLock(fair);
647	>	lock.writeLock().lock();
648	>	lock.readLock().lock();
649	>	lock.readLock().unlock();
650	>
651	>	Thread t1 = newStartedThread(new CheckedRunnable() {
652	>	public void realRun() {
653	>	lock.readLock().lock();
654	>	lock.readLock().unlock();
655	>	}});
656	>	Thread t2 = newStartedThread(new CheckedRunnable() {
657	>	public void realRun() {
658	>	lock.readLock().lock();
659	>	lock.readLock().unlock();
660	>	}});
661	>
662	>	waitForQueuedThread(lock, t1);
663	>	waitForQueuedThread(lock, t2);
664	>	assertWriteLockedByMoi(lock);
665	>	lock.readLock().lock();
666	>	lock.readLock().unlock();
667	>	releaseWriteLock(lock);
668	>	awaitTermination(t1);
669	>	awaitTermination(t2);
670	>	}
671	>
672	>	/**
673	>	* Read lock succeeds if write locked by current thread even if
674	>	* other threads are waiting for writelock
675	>	*/
676	>	public void testReadHoldingWriteLock3()      { testReadHoldingWriteLock3(false); }
677	>	public void testReadHoldingWriteLock3_fair() { testReadHoldingWriteLock3(true); }
678	>	public void testReadHoldingWriteLock3(boolean fair) {
679	>	final PublicReentrantReadWriteLock lock =
680	>	new PublicReentrantReadWriteLock(fair);
681	>	lock.writeLock().lock();
682	>	lock.readLock().lock();
683	>	lock.readLock().unlock();
684	>
685	>	Thread t1 = newStartedThread(new CheckedRunnable() {
686	>	public void realRun() {
687	>	lock.writeLock().lock();
688	>	lock.writeLock().unlock();
689	>	}});
690	>	Thread t2 = newStartedThread(new CheckedRunnable() {
691	>	public void realRun() {
692	>	lock.writeLock().lock();
693	>	lock.writeLock().unlock();
694	>	}});
695	>
696	>	waitForQueuedThread(lock, t1);
697	>	waitForQueuedThread(lock, t2);
698	>	assertWriteLockedByMoi(lock);
699	>	lock.readLock().lock();
700	>	lock.readLock().unlock();
701	>	assertWriteLockedByMoi(lock);
702	>	lock.writeLock().unlock();
703	>	awaitTermination(t1);
704	>	awaitTermination(t2);
705	>	}
706	>
707	>	/**
708	>	* Write lock succeeds if write locked by current thread even if
709	>	* other threads are waiting for writelock
710	>	*/
711	>	public void testWriteHoldingWriteLock4()      { testWriteHoldingWriteLock4(false); }
712	>	public void testWriteHoldingWriteLock4_fair() { testWriteHoldingWriteLock4(true); }
713	>	public void testWriteHoldingWriteLock4(boolean fair) {
714	>	final PublicReentrantReadWriteLock lock =
715	>	new PublicReentrantReadWriteLock(fair);
716	>	lock.writeLock().lock();
717	>	lock.writeLock().lock();
718	>	lock.writeLock().unlock();
719	>
720	>	Thread t1 = newStartedThread(new CheckedRunnable() {
721	>	public void realRun() {
722	>	lock.writeLock().lock();
723	>	lock.writeLock().unlock();
724	>	}});
725	>	Thread t2 = newStartedThread(new CheckedRunnable() {
726	>	public void realRun() {
727	>	lock.writeLock().lock();
728	>	lock.writeLock().unlock();
729	>	}});
730	>
731	>	waitForQueuedThread(lock, t1);
732	>	waitForQueuedThread(lock, t2);
733	>	assertWriteLockedByMoi(lock);
734	>	assertEquals(1, lock.getWriteHoldCount());
735	>	lock.writeLock().lock();
736	>	assertWriteLockedByMoi(lock);
737	>	assertEquals(2, lock.getWriteHoldCount());
738	>	lock.writeLock().unlock();
739	>	assertWriteLockedByMoi(lock);
740	>	assertEquals(1, lock.getWriteHoldCount());
741	>	lock.writeLock().unlock();
742	>	awaitTermination(t1);
743	>	awaitTermination(t2);
744	>	}
745	>
746	>	/**
747	>	* Read tryLock succeeds if readlocked but not writelocked
748	>	*/
749	>	public void testTryLockWhenReadLocked()      { testTryLockWhenReadLocked(false); }
750	>	public void testTryLockWhenReadLocked_fair() { testTryLockWhenReadLocked(true); }
751	>	public void testTryLockWhenReadLocked(boolean fair) {
752	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
753	>	lock.readLock().lock();
754	>	Thread t = newStartedThread(new CheckedRunnable() {
755	>	public void realRun() {
756	>	assertTrue(lock.readLock().tryLock());
757	>	lock.readLock().unlock();
758	>	}});
759	>
760	>	awaitTermination(t);
761	>	lock.readLock().unlock();
762	>	}
763	>
764	>	/**
765	>	* write tryLock fails when readlocked
766	>	*/
767	>	public void testWriteTryLockWhenReadLocked()      { testWriteTryLockWhenReadLocked(false); }
768	>	public void testWriteTryLockWhenReadLocked_fair() { testWriteTryLockWhenReadLocked(true); }
769	>	public void testWriteTryLockWhenReadLocked(boolean fair) {
770	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
771	>	lock.readLock().lock();
772	>	Thread t = newStartedThread(new CheckedRunnable() {
773	>	public void realRun() {
774	>	assertFalse(lock.writeLock().tryLock());
775	>	}});
776	>
777	>	awaitTermination(t);
778	>	lock.readLock().unlock();
779	>	}
780	>
781	>	/**
782	>	* write timed tryLock times out if locked
783	>	*/
784	>	public void testWriteTryLock_Timeout()      { testWriteTryLock_Timeout(false); }
785	>	public void testWriteTryLock_Timeout_fair() { testWriteTryLock_Timeout(true); }
786	>	public void testWriteTryLock_Timeout(boolean fair) {
787	>	final PublicReentrantReadWriteLock lock =
788	>	new PublicReentrantReadWriteLock(fair);
789	>	lock.writeLock().lock();
790	>	Thread t = newStartedThread(new CheckedRunnable() {
791	>	public void realRun() throws InterruptedException {
792	>	long startTime = System.nanoTime();
793	>	long timeoutMillis = 10;
794	>	assertFalse(lock.writeLock().tryLock(timeoutMillis, MILLISECONDS));
795	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
796	>	}});
797	>
798	>	awaitTermination(t);
799	>	releaseWriteLock(lock);
800	>	}
801	>
802	>	/**
803	>	* read timed tryLock times out if write-locked
804	>	*/
805	>	public void testReadTryLock_Timeout()      { testReadTryLock_Timeout(false); }
806	>	public void testReadTryLock_Timeout_fair() { testReadTryLock_Timeout(true); }
807	>	public void testReadTryLock_Timeout(boolean fair) {
808	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
809	>	lock.writeLock().lock();
810	>	Thread t = newStartedThread(new CheckedRunnable() {
811	>	public void realRun() throws InterruptedException {
812	>	long startTime = System.nanoTime();
813	>	long timeoutMillis = 10;
814	>	assertFalse(lock.readLock().tryLock(timeoutMillis, MILLISECONDS));
815	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
816	>	}});
817	>
818	>	awaitTermination(t);
819	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
820	>	lock.writeLock().unlock();
821	>	}
822	>
823	>	/**
824	>	* write lockInterruptibly succeeds if unlocked, else is interruptible
825	>	*/
826	>	public void testWriteLockInterruptibly()      { testWriteLockInterruptibly(false); }
827	>	public void testWriteLockInterruptibly_fair() { testWriteLockInterruptibly(true); }
828	>	public void testWriteLockInterruptibly(boolean fair) {
829	>	final PublicReentrantReadWriteLock lock =
830	>	new PublicReentrantReadWriteLock(fair);
831	>	try {
832	>	lock.writeLock().lockInterruptibly();
833	>	} catch (InterruptedException ie) {
834	>	threadUnexpectedException(ie);
835	>	}
836	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
837	>	public void realRun() throws InterruptedException {
838	>	lock.writeLock().lockInterruptibly();
839	>	}});
840	>
841	>	waitForQueuedThread(lock, t);
842	>	t.interrupt();
843	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
844	>	awaitTermination(t);
845	>	releaseWriteLock(lock);
846	>	}
847	>
848	>	/**
849	>	* read lockInterruptibly succeeds if lock free else is interruptible
850	>	*/
851	>	public void testReadLockInterruptibly()      { testReadLockInterruptibly(false); }
852	>	public void testReadLockInterruptibly_fair() { testReadLockInterruptibly(true); }
853	>	public void testReadLockInterruptibly(boolean fair) {
854	>	final PublicReentrantReadWriteLock lock =
855	>	new PublicReentrantReadWriteLock(fair);
856	>	try {
857	>	lock.readLock().lockInterruptibly();
858	>	lock.readLock().unlock();
859	>	lock.writeLock().lockInterruptibly();
860	>	} catch (InterruptedException ie) {
861	>	threadUnexpectedException(ie);
862	>	}
863	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
864	>	public void realRun() throws InterruptedException {
865	>	lock.readLock().lockInterruptibly();
866	>	}});
867	>
868	>	waitForQueuedThread(lock, t);
869	>	t.interrupt();
870	>	awaitTermination(t);
871	>	releaseWriteLock(lock);
872	>	}
873	>
874	>	/**
875	>	* Calling await without holding lock throws IllegalMonitorStateException
876	>	*/
877	>	public void testAwait_IMSE()      { testAwait_IMSE(false); }
878	>	public void testAwait_IMSE_fair() { testAwait_IMSE(true); }
879	>	public void testAwait_IMSE(boolean fair) {
880	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
881	>	final Condition c = lock.writeLock().newCondition();
882	>	for (AwaitMethod awaitMethod : AwaitMethod.values()) {
883	>	long startTime = System.nanoTime();
884	>	try {
885	>	await(c, awaitMethod);
886	>	shouldThrow();
887	>	} catch (IllegalMonitorStateException success) {
888	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
889	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
890	>	}
891	>	}
892	>
893	>	/**
894	>	* Calling signal without holding lock throws IllegalMonitorStateException
895	>	*/
896	>	public void testSignal_IMSE()      { testSignal_IMSE(false); }
897	>	public void testSignal_IMSE_fair() { testSignal_IMSE(true); }
898	>	public void testSignal_IMSE(boolean fair) {
899	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
900	>	final Condition c = lock.writeLock().newCondition();
901	>	try {
902	>	c.signal();
903	>	shouldThrow();
904	>	} catch (IllegalMonitorStateException success) {}
905	>	}
906	>
907	>	/**
908	>	* Calling signalAll without holding lock throws IllegalMonitorStateException
909	>	*/
910	>	public void testSignalAll_IMSE()      { testSignalAll_IMSE(false); }
911	>	public void testSignalAll_IMSE_fair() { testSignalAll_IMSE(true); }
912	>	public void testSignalAll_IMSE(boolean fair) {
913	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
914	>	final Condition c = lock.writeLock().newCondition();
915	>	try {
916	>	c.signalAll();
917	>	shouldThrow();
918	>	} catch (IllegalMonitorStateException success) {}
919	>	}
920	>
921	>	/**
922	>	* awaitNanos without a signal times out
923	>	*/
924	>	public void testAwaitNanos_Timeout()      { testAwaitNanos_Timeout(false); }
925	>	public void testAwaitNanos_Timeout_fair() { testAwaitNanos_Timeout(true); }
926	>	public void testAwaitNanos_Timeout(boolean fair) {
927	>	try {
928	>	final ReentrantReadWriteLock lock =
929	>	new ReentrantReadWriteLock(fair);
930	>	final Condition c = lock.writeLock().newCondition();
931	>	lock.writeLock().lock();
932	>	long startTime = System.nanoTime();
933	>	long timeoutMillis = 10;
934	>	long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis);
935	>	long nanosRemaining = c.awaitNanos(timeoutNanos);
936	>	assertTrue(nanosRemaining <= 0);
937	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
938	>	lock.writeLock().unlock();
939	>	} catch (InterruptedException e) {
940	>	threadUnexpectedException(e);
941	>	}
942	>	}
943	>
944	>	/**
945	>	* timed await without a signal times out
946	>	*/
947	>	public void testAwait_Timeout()      { testAwait_Timeout(false); }
948	>	public void testAwait_Timeout_fair() { testAwait_Timeout(true); }
949	>	public void testAwait_Timeout(boolean fair) {
950	>	try {
951	>	final ReentrantReadWriteLock lock =
952	>	new ReentrantReadWriteLock(fair);
953	>	final Condition c = lock.writeLock().newCondition();
954	>	lock.writeLock().lock();
955	>	long startTime = System.nanoTime();
956	>	long timeoutMillis = 10;
957	>	assertFalse(c.await(timeoutMillis, MILLISECONDS));
958	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
959	>	lock.writeLock().unlock();
960	>	} catch (InterruptedException e) {
961	>	threadUnexpectedException(e);
962	>	}
963	>	}
964	>
965	>	/**
966	>	* awaitUntil without a signal times out
967	>	*/
968	>	public void testAwaitUntil_Timeout()      { testAwaitUntil_Timeout(false); }
969	>	public void testAwaitUntil_Timeout_fair() { testAwaitUntil_Timeout(true); }
970	>	public void testAwaitUntil_Timeout(boolean fair) {
971	>	try {
972	>	final ReentrantReadWriteLock lock =
973	>	new ReentrantReadWriteLock(fair);
974	>	final Condition c = lock.writeLock().newCondition();
975	>	lock.writeLock().lock();
976	>	long startTime = System.nanoTime();
977	>	long timeoutMillis = 10;
978	>	java.util.Date d = new java.util.Date();
979	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + timeoutMillis)));
980	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
981	>	lock.writeLock().unlock();
982	>	} catch (InterruptedException e) {
983	>	threadUnexpectedException(e);
984	>	}
985	>	}
986	>
987	>	/**
988	>	* await returns when signalled
989	>	*/
990	>	public void testAwait()      { testAwait(false); }
991	>	public void testAwait_fair() { testAwait(true); }
992	>	public void testAwait(boolean fair) {
993	>	final PublicReentrantReadWriteLock lock =
994	>	new PublicReentrantReadWriteLock(fair);
995	>	final Condition c = lock.writeLock().newCondition();
996	>	final CountDownLatch locked = new CountDownLatch(1);
997	>	Thread t = newStartedThread(new CheckedRunnable() {
998	>	public void realRun() throws InterruptedException {
999	>	lock.writeLock().lock();
1000	>	locked.countDown();
1001	>	c.await();
1002	>	lock.writeLock().unlock();
1003	>	}});
1004	>
1005	>	await(locked);
1006	>	lock.writeLock().lock();
1007	>	assertHasWaiters(lock, c, t);
1008	>	c.signal();
1009	>	assertHasNoWaiters(lock, c);
1010	>	assertTrue(t.isAlive());
1011	>	lock.writeLock().unlock();
1012	>	awaitTermination(t);
1013	>	}
1014	>
1015	>	/**
1016	>	* awaitUninterruptibly is uninterruptible
1017	>	*/
1018	>	public void testAwaitUninterruptibly()      { testAwaitUninterruptibly(false); }
1019	>	public void testAwaitUninterruptibly_fair() { testAwaitUninterruptibly(true); }
1020	>	public void testAwaitUninterruptibly(boolean fair) {
1021	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1022	>	final Condition c = lock.writeLock().newCondition();
1023	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(2);
1024	>
1025	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1026	>	public void realRun() {
1027	>	// Interrupt before awaitUninterruptibly
1028	>	lock.writeLock().lock();
1029	>	pleaseInterrupt.countDown();
1030	>	Thread.currentThread().interrupt();
1031	>	c.awaitUninterruptibly();
1032	>	assertTrue(Thread.interrupted());
1033	>	lock.writeLock().unlock();
1034	>	}});
1035	>
1036	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1037	>	public void realRun() {
1038	>	// Interrupt during awaitUninterruptibly
1039	>	lock.writeLock().lock();
1040	>	pleaseInterrupt.countDown();
1041	>	c.awaitUninterruptibly();
1042	>	assertTrue(Thread.interrupted());
1043	>	lock.writeLock().unlock();
1044	>	}});
1045	>
1046	>	await(pleaseInterrupt);
1047	>	lock.writeLock().lock();
1048	>	lock.writeLock().unlock();
1049	>	t2.interrupt();
1050	>
1051	>	assertThreadStaysAlive(t1);
1052	>	assertTrue(t2.isAlive());
1053	>
1054	>	lock.writeLock().lock();
1055	>	c.signalAll();
1056	>	lock.writeLock().unlock();
1057	>
1058	>	awaitTermination(t1);
1059	>	awaitTermination(t2);
1060	>	}
1061	>
1062	>	/**
1063	>	* await/awaitNanos/awaitUntil is interruptible
1064	>	*/
1065	>	public void testInterruptible_await()           { testInterruptible(false, AwaitMethod.await); }
1066	>	public void testInterruptible_await_fair()      { testInterruptible(true,  AwaitMethod.await); }
1067	>	public void testInterruptible_awaitTimed()      { testInterruptible(false, AwaitMethod.awaitTimed); }
1068	>	public void testInterruptible_awaitTimed_fair() { testInterruptible(true,  AwaitMethod.awaitTimed); }
1069	>	public void testInterruptible_awaitNanos()      { testInterruptible(false, AwaitMethod.awaitNanos); }
1070	>	public void testInterruptible_awaitNanos_fair() { testInterruptible(true,  AwaitMethod.awaitNanos); }
1071	>	public void testInterruptible_awaitUntil()      { testInterruptible(false, AwaitMethod.awaitUntil); }
1072	>	public void testInterruptible_awaitUntil_fair() { testInterruptible(true,  AwaitMethod.awaitUntil); }
1073	>	public void testInterruptible(boolean fair, final AwaitMethod awaitMethod) {
1074	>	final PublicReentrantReadWriteLock lock =
1075	>	new PublicReentrantReadWriteLock(fair);
1076	>	final Condition c = lock.writeLock().newCondition();
1077	>	final CountDownLatch locked = new CountDownLatch(1);
1078	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1079	>	public void realRun() throws InterruptedException {
1080	>	lock.writeLock().lock();
1081	>	assertWriteLockedByMoi(lock);
1082	>	assertHasNoWaiters(lock, c);
1083	>	locked.countDown();
1084	>	try {
1085	>	await(c, awaitMethod);
1086	>	} finally {
1087	>	assertWriteLockedByMoi(lock);
1088	>	assertHasNoWaiters(lock, c);
1089	>	lock.writeLock().unlock();
1090	>	assertFalse(Thread.interrupted());
1091	>	}
1092	>	}});
1093	>
1094	>	await(locked);
1095	>	assertHasWaiters(lock, c, t);
1096	>	t.interrupt();
1097	>	awaitTermination(t);
1098	>	assertNotWriteLocked(lock);
1099	>	}
1100	>
1101	>	/**
1102	>	* signalAll wakes up all threads
1103	>	*/
1104	>	public void testSignalAll_await()           { testSignalAll(false, AwaitMethod.await); }
1105	>	public void testSignalAll_await_fair()      { testSignalAll(true,  AwaitMethod.await); }
1106	>	public void testSignalAll_awaitTimed()      { testSignalAll(false, AwaitMethod.awaitTimed); }
1107	>	public void testSignalAll_awaitTimed_fair() { testSignalAll(true,  AwaitMethod.awaitTimed); }
1108	>	public void testSignalAll_awaitNanos()      { testSignalAll(false, AwaitMethod.awaitNanos); }
1109	>	public void testSignalAll_awaitNanos_fair() { testSignalAll(true,  AwaitMethod.awaitNanos); }
1110	>	public void testSignalAll_awaitUntil()      { testSignalAll(false, AwaitMethod.awaitUntil); }
1111	>	public void testSignalAll_awaitUntil_fair() { testSignalAll(true,  AwaitMethod.awaitUntil); }
1112	>	public void testSignalAll(boolean fair, final AwaitMethod awaitMethod) {
1113	>	final PublicReentrantReadWriteLock lock =
1114	>	new PublicReentrantReadWriteLock(fair);
1115	>	final Condition c = lock.writeLock().newCondition();
1116	>	final CountDownLatch locked = new CountDownLatch(2);
1117	>	final Lock writeLock = lock.writeLock();
1118	>	class Awaiter extends CheckedRunnable {
1119	>	public void realRun() throws InterruptedException {
1120	>	writeLock.lock();
1121	>	locked.countDown();
1122	>	await(c, awaitMethod);
1123	>	writeLock.unlock();
1124	>	}
1125	>	}
1126	>
1127	>	Thread t1 = newStartedThread(new Awaiter());
1128	>	Thread t2 = newStartedThread(new Awaiter());
1129	>
1130	>	await(locked);
1131	>	writeLock.lock();
1132	>	assertHasWaiters(lock, c, t1, t2);
1133	>	c.signalAll();
1134	>	assertHasNoWaiters(lock, c);
1135	>	writeLock.unlock();
1136	>	awaitTermination(t1);
1137	>	awaitTermination(t2);
1138	>	}
1139	>
1140	>	/**
1141	>	* signal wakes up waiting threads in FIFO order
1142	>	*/
1143	>	public void testSignalWakesFifo()      { testSignalWakesFifo(false); }
1144	>	public void testSignalWakesFifo_fair() { testSignalWakesFifo(true); }
1145	>	public void testSignalWakesFifo(boolean fair) {
1146	>	final PublicReentrantReadWriteLock lock =
1147	>	new PublicReentrantReadWriteLock(fair);
1148	>	final Condition c = lock.writeLock().newCondition();
1149	>	final CountDownLatch locked1 = new CountDownLatch(1);
1150	>	final CountDownLatch locked2 = new CountDownLatch(1);
1151	>	final Lock writeLock = lock.writeLock();
1152	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1153	>	public void realRun() throws InterruptedException {
1154	>	writeLock.lock();
1155	>	locked1.countDown();
1156	>	c.await();
1157	>	writeLock.unlock();
1158	>	}});
1159	>
1160	>	await(locked1);
1161	>
1162	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1163	>	public void realRun() throws InterruptedException {
1164	>	writeLock.lock();
1165	>	locked2.countDown();
1166	>	c.await();
1167	>	writeLock.unlock();
1168	>	}});
1169	>
1170	>	await(locked2);
1171	>
1172	>	writeLock.lock();
1173	>	assertHasWaiters(lock, c, t1, t2);
1174	>	assertFalse(lock.hasQueuedThreads());
1175	>	c.signal();
1176	>	assertHasWaiters(lock, c, t2);
1177	>	assertTrue(lock.hasQueuedThread(t1));
1178	>	assertFalse(lock.hasQueuedThread(t2));
1179	>	c.signal();
1180	>	assertHasNoWaiters(lock, c);
1181	>	assertTrue(lock.hasQueuedThread(t1));
1182	>	assertTrue(lock.hasQueuedThread(t2));
1183	>	writeLock.unlock();
1184	>	awaitTermination(t1);
1185	>	awaitTermination(t2);
1186	>	}
1187	>
1188	>	/**
1189	>	* await after multiple reentrant locking preserves lock count
1190	>	*/
1191	>	public void testAwaitLockCount()      { testAwaitLockCount(false); }
1192	>	public void testAwaitLockCount_fair() { testAwaitLockCount(true); }
1193	>	public void testAwaitLockCount(boolean fair) {
1194	>	final PublicReentrantReadWriteLock lock =
1195	>	new PublicReentrantReadWriteLock(fair);
1196	>	final Condition c = lock.writeLock().newCondition();
1197	>	final CountDownLatch locked = new CountDownLatch(2);
1198	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1199	>	public void realRun() throws InterruptedException {
1200	>	lock.writeLock().lock();
1201	>	assertWriteLockedByMoi(lock);
1202	>	assertEquals(1, lock.writeLock().getHoldCount());
1203	>	locked.countDown();
1204	>	c.await();
1205	>	assertWriteLockedByMoi(lock);
1206	>	assertEquals(1, lock.writeLock().getHoldCount());
1207	>	lock.writeLock().unlock();
1208	>	}});
1209	>
1210	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1211	>	public void realRun() throws InterruptedException {
1212	>	lock.writeLock().lock();
1213	>	lock.writeLock().lock();
1214	>	assertWriteLockedByMoi(lock);
1215	>	assertEquals(2, lock.writeLock().getHoldCount());
1216	>	locked.countDown();
1217	>	c.await();
1218	>	assertWriteLockedByMoi(lock);
1219	>	assertEquals(2, lock.writeLock().getHoldCount());
1220	>	lock.writeLock().unlock();
1221	>	lock.writeLock().unlock();
1222	>	}});
1223	>
1224	>	await(locked);
1225	>	lock.writeLock().lock();
1226	>	assertHasWaiters(lock, c, t1, t2);
1227	>	c.signalAll();
1228	>	assertHasNoWaiters(lock, c);
1229	>	lock.writeLock().unlock();
1230	>	awaitTermination(t1);
1231	>	awaitTermination(t2);
1232	>	}
1233	>
1234	>	/**
1235	>	* A serialized lock deserializes as unlocked
1236	>	*/
1237	>	public void testSerialization()      { testSerialization(false); }
1238	>	public void testSerialization_fair() { testSerialization(true); }
1239	>	public void testSerialization(boolean fair) {
1240	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1241	>	lock.writeLock().lock();
1242	>	lock.readLock().lock();
1243	>
1244	>	ReentrantReadWriteLock clone = serialClone(lock);
1245	>	assertEquals(lock.isFair(), clone.isFair());
1246	>	assertTrue(lock.isWriteLocked());
1247	>	assertFalse(clone.isWriteLocked());
1248	>	assertEquals(1, lock.getReadLockCount());
1249	>	assertEquals(0, clone.getReadLockCount());
1250	>	clone.writeLock().lock();
1251	>	clone.readLock().lock();
1252	>	assertTrue(clone.isWriteLocked());
1253	>	assertEquals(1, clone.getReadLockCount());
1254	>	clone.readLock().unlock();
1255	>	clone.writeLock().unlock();
1256	>	assertFalse(clone.isWriteLocked());
1257	>	assertEquals(1, lock.getReadLockCount());
1258	>	assertEquals(0, clone.getReadLockCount());
1259	>	}
1260	>
1261	>	/**
1262	>	* hasQueuedThreads reports whether there are waiting threads
1263	>	*/
1264	>	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
1265	>	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
1266	>	public void testHasQueuedThreads(boolean fair) {
1267	>	final PublicReentrantReadWriteLock lock =
1268	>	new PublicReentrantReadWriteLock(fair);
1269	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1270	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1271	>	assertFalse(lock.hasQueuedThreads());
1272	>	lock.writeLock().lock();
1273	>	assertFalse(lock.hasQueuedThreads());
1274	>	t1.start();
1275	>	waitForQueuedThread(lock, t1);
1276	>	assertTrue(lock.hasQueuedThreads());
1277	>	t2.start();
1278	>	waitForQueuedThread(lock, t2);
1279	>	assertTrue(lock.hasQueuedThreads());
1280	>	t1.interrupt();
1281	>	awaitTermination(t1);
1282	>	assertTrue(lock.hasQueuedThreads());
1283	>	lock.writeLock().unlock();
1284	>	awaitTermination(t2);
1285	>	assertFalse(lock.hasQueuedThreads());
1286	>	}
1287	>
1288	>	/**
1289	>	* hasQueuedThread(null) throws NPE
1290	>	*/
1291	>	public void testHasQueuedThreadNPE()      { testHasQueuedThreadNPE(false); }
1292	>	public void testHasQueuedThreadNPE_fair() { testHasQueuedThreadNPE(true); }
1293	>	public void testHasQueuedThreadNPE(boolean fair) {
1294	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1295	>	try {
1296	>	lock.hasQueuedThread(null);
1297	>	shouldThrow();
1298	>	} catch (NullPointerException success) {}
1299	>	}
1300	>
1301	>	/**
1302	>	* hasQueuedThread reports whether a thread is queued
1303	>	*/
1304	>	public void testHasQueuedThread()      { testHasQueuedThread(false); }
1305	>	public void testHasQueuedThread_fair() { testHasQueuedThread(true); }
1306	>	public void testHasQueuedThread(boolean fair) {
1307	>	final PublicReentrantReadWriteLock lock =
1308	>	new PublicReentrantReadWriteLock(fair);
1309	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1310	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1311	>	assertFalse(lock.hasQueuedThread(t1));
1312	>	assertFalse(lock.hasQueuedThread(t2));
1313	>	lock.writeLock().lock();
1314	>	t1.start();
1315	>	waitForQueuedThread(lock, t1);
1316	>	assertTrue(lock.hasQueuedThread(t1));
1317	>	assertFalse(lock.hasQueuedThread(t2));
1318	>	t2.start();
1319	>	waitForQueuedThread(lock, t2);
1320	>	assertTrue(lock.hasQueuedThread(t1));
1321	>	assertTrue(lock.hasQueuedThread(t2));
1322	>	t1.interrupt();
1323	>	awaitTermination(t1);
1324	>	assertFalse(lock.hasQueuedThread(t1));
1325	>	assertTrue(lock.hasQueuedThread(t2));
1326	>	lock.writeLock().unlock();
1327	>	awaitTermination(t2);
1328	>	assertFalse(lock.hasQueuedThread(t1));
1329	>	assertFalse(lock.hasQueuedThread(t2));
1330	>	}
1331	>
1332	>	/**
1333	>	* getQueueLength reports number of waiting threads
1334	>	*/
1335	>	public void testGetQueueLength()      { testGetQueueLength(false); }
1336	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
1337	>	public void testGetQueueLength(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	>	assertEquals(0, lock.getQueueLength());
1343	>	lock.writeLock().lock();
1344	>	t1.start();
1345	>	waitForQueuedThread(lock, t1);
1346	>	assertEquals(1, lock.getQueueLength());
1347	>	t2.start();
1348	>	waitForQueuedThread(lock, t2);
1349	>	assertEquals(2, lock.getQueueLength());
1350	>	t1.interrupt();
1351	>	awaitTermination(t1);
1352	>	assertEquals(1, lock.getQueueLength());
1353	>	lock.writeLock().unlock();
1354	>	awaitTermination(t2);
1355	>	assertEquals(0, lock.getQueueLength());
1356	>	}
1357	>
1358	>	/**
1359	>	* getQueuedThreads includes waiting threads
1360	>	*/
1361	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
1362	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
1363	>	public void testGetQueuedThreads(boolean fair) {
1364	>	final PublicReentrantReadWriteLock lock =
1365	>	new PublicReentrantReadWriteLock(fair);
1366	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1367	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1368	>	assertTrue(lock.getQueuedThreads().isEmpty());
1369	>	lock.writeLock().lock();
1370	>	assertTrue(lock.getQueuedThreads().isEmpty());
1371	>	t1.start();
1372	>	waitForQueuedThread(lock, t1);
1373	>	assertEquals(1, lock.getQueuedThreads().size());
1374	>	assertTrue(lock.getQueuedThreads().contains(t1));
1375	>	t2.start();
1376	>	waitForQueuedThread(lock, t2);
1377	>	assertEquals(2, lock.getQueuedThreads().size());
1378	>	assertTrue(lock.getQueuedThreads().contains(t1));
1379	>	assertTrue(lock.getQueuedThreads().contains(t2));
1380	>	t1.interrupt();
1381	>	awaitTermination(t1);
1382	>	assertFalse(lock.getQueuedThreads().contains(t1));
1383	>	assertTrue(lock.getQueuedThreads().contains(t2));
1384	>	assertEquals(1, lock.getQueuedThreads().size());
1385	>	lock.writeLock().unlock();
1386	>	awaitTermination(t2);
1387	>	assertTrue(lock.getQueuedThreads().isEmpty());
1388	>	}
1389	>
1390	>	/**
1391	>	* hasWaiters throws NPE if null
1392	>	*/
1393	>	public void testHasWaitersNPE()      { testHasWaitersNPE(false); }
1394	>	public void testHasWaitersNPE_fair() { testHasWaitersNPE(true); }
1395	>	public void testHasWaitersNPE(boolean fair) {
1396	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1397	>	try {
1398	>	lock.hasWaiters(null);
1399	>	shouldThrow();
1400	>	} catch (NullPointerException success) {}
1401	>	}
1402	>
1403	>	/**
1404	>	* getWaitQueueLength throws NPE if null
1405	>	*/
1406	>	public void testGetWaitQueueLengthNPE()      { testGetWaitQueueLengthNPE(false); }
1407	>	public void testGetWaitQueueLengthNPE_fair() { testGetWaitQueueLengthNPE(true); }
1408	>	public void testGetWaitQueueLengthNPE(boolean fair) {
1409	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1410	>	try {
1411	>	lock.getWaitQueueLength(null);
1412	>	shouldThrow();
1413	>	} catch (NullPointerException success) {}
1414	>	}
1415	>
1416	>	/**
1417	>	* getWaitingThreads throws NPE if null
1418	>	*/
1419	>	public void testGetWaitingThreadsNPE()      { testGetWaitingThreadsNPE(false); }
1420	>	public void testGetWaitingThreadsNPE_fair() { testGetWaitingThreadsNPE(true); }
1421	>	public void testGetWaitingThreadsNPE(boolean fair) {
1422	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(fair);
1423	>	try {
1424	>	lock.getWaitingThreads(null);
1425	>	shouldThrow();
1426	>	} catch (NullPointerException success) {}
1427	>	}
1428	>
1429	>	/**
1430	>	* hasWaiters throws IllegalArgumentException if not owned
1431	>	*/
1432	>	public void testHasWaitersIAE()      { testHasWaitersIAE(false); }
1433	>	public void testHasWaitersIAE_fair() { testHasWaitersIAE(true); }
1434	>	public void testHasWaitersIAE(boolean fair) {
1435	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1436	>	final Condition c = lock.writeLock().newCondition();
1437	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(fair);
1438	>	try {
1439	>	lock2.hasWaiters(c);
1440	>	shouldThrow();
1441	>	} catch (IllegalArgumentException success) {}
1442	>	}
1443	>
1444	>	/**
1445	>	* hasWaiters throws IllegalMonitorStateException if not locked
1446	>	*/
1447	>	public void testHasWaitersIMSE()      { testHasWaitersIMSE(false); }
1448	>	public void testHasWaitersIMSE_fair() { testHasWaitersIMSE(true); }
1449	>	public void testHasWaitersIMSE(boolean fair) {
1450	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1451	>	final Condition c = lock.writeLock().newCondition();
1452	>	try {
1453	>	lock.hasWaiters(c);
1454	>	shouldThrow();
1455	>	} catch (IllegalMonitorStateException success) {}
1456		}
1457
1458	+	/**
1459	+	* getWaitQueueLength throws IllegalArgumentException if not owned
1460	+	*/
1461	+	public void testGetWaitQueueLengthIAE()      { testGetWaitQueueLengthIAE(false); }
1462	+	public void testGetWaitQueueLengthIAE_fair() { testGetWaitQueueLengthIAE(true); }
1463	+	public void testGetWaitQueueLengthIAE(boolean fair) {
1464	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1465	+	final Condition c = lock.writeLock().newCondition();
1466	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(fair);
1467	+	try {
1468	+	lock2.getWaitQueueLength(c);
1469	+	shouldThrow();
1470	+	} catch (IllegalArgumentException success) {}
1471	+	}
1472	+
1473	+	/**
1474	+	* getWaitQueueLength throws IllegalMonitorStateException if not locked
1475	+	*/
1476	+	public void testGetWaitQueueLengthIMSE()      { testGetWaitQueueLengthIMSE(false); }
1477	+	public void testGetWaitQueueLengthIMSE_fair() { testGetWaitQueueLengthIMSE(true); }
1478	+	public void testGetWaitQueueLengthIMSE(boolean fair) {
1479	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1480	+	final Condition c = lock.writeLock().newCondition();
1481	+	try {
1482	+	lock.getWaitQueueLength(c);
1483	+	shouldThrow();
1484	+	} catch (IllegalMonitorStateException success) {}
1485	+	}
1486	+
1487	+	/**
1488	+	* getWaitingThreads throws IllegalArgumentException if not owned
1489	+	*/
1490	+	public void testGetWaitingThreadsIAE()      { testGetWaitingThreadsIAE(false); }
1491	+	public void testGetWaitingThreadsIAE_fair() { testGetWaitingThreadsIAE(true); }
1492	+	public void testGetWaitingThreadsIAE(boolean fair) {
1493	+	final PublicReentrantReadWriteLock lock =
1494	+	new PublicReentrantReadWriteLock(fair);
1495	+	final Condition c = lock.writeLock().newCondition();
1496	+	final PublicReentrantReadWriteLock lock2 =
1497	+	new PublicReentrantReadWriteLock(fair);
1498	+	try {
1499	+	lock2.getWaitingThreads(c);
1500	+	shouldThrow();
1501	+	} catch (IllegalArgumentException success) {}
1502	+	}
1503	+
1504	+	/**
1505	+	* getWaitingThreads throws IllegalMonitorStateException if not locked
1506	+	*/
1507	+	public void testGetWaitingThreadsIMSE()      { testGetWaitingThreadsIMSE(false); }
1508	+	public void testGetWaitingThreadsIMSE_fair() { testGetWaitingThreadsIMSE(true); }
1509	+	public void testGetWaitingThreadsIMSE(boolean fair) {
1510	+	final PublicReentrantReadWriteLock lock =
1511	+	new PublicReentrantReadWriteLock(fair);
1512	+	final Condition c = lock.writeLock().newCondition();
1513	+	try {
1514	+	lock.getWaitingThreads(c);
1515	+	shouldThrow();
1516	+	} catch (IllegalMonitorStateException success) {}
1517	+	}
1518
1519	<	private static long SHORT_DELAY_MS = 100;
1520	<	private static long MEDIUM_DELAY_MS = 1000;
1521	<	private static long LONG_DELAY_MS = 10000;
1522	<
1523	<	/*
1524	<	* Unlocks an unlocked lock, throws Illegal Monitor State
1525	<	*
1526	<	*/
1527	<
1528	<	public void testIllegalMonitorStateException(){
1529	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
1530	<	try{
1531	<	rl.writeLock().unlock();
1532	<	fail("Should of thown Illegal Monitor State Exception");
1533	<
1534	<	}catch(IllegalMonitorStateException sucess){}
1535	<
1536	<
1537	<	}
1538	<
1539	<	/*
1540	<	* makes a lock, locks it, tries to aquire the lock in another thread
1541	<	* interrupts that thread and waits for an interrupted Exception to
1542	<	* be thrown.
1543	<	*/
1544	<
1545	<	public void testInterruptedException(){
1546	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1547	<	lock.writeLock().lock();
1548	<	Thread t = new Thread(new Runnable() {
1549	<	public void run(){
1550	<	try{
1551	<	lock.writeLock().lockInterruptibly();
1552	<	fail("should throw");
1553	<	}catch(InterruptedException sucess){}
1554	<	}
1555	<	});
1556	<	t.start();
1557	<	t.interrupt();
1558	<	lock.writeLock().unlock();
1559	<	}
1560	<
1561	<	/*
1562	<	* tests for interrupted exception on a timed wait
1563	<	*
1564	<	*/
1565	<
1566	<
1567	<	public void testInterruptedException2(){
1568	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1569	<	lock.writeLock().lock();
1570	<	Thread t = new Thread(new Runnable() {
1571	<	public void run(){
1572	<	try{
1573	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
1574	<	fail("should throw");
1575	<	}catch(InterruptedException sucess){}
1576	<	}
1577	<	});
1578	<	t.start();
1579	<	t.interrupt();
1580	<	}
1581	<
1582	<
1583	<
1584	<	/*
1585	<	* current thread locks interruptibly the thread
1586	<	* another thread tries to aquire the lock and blocks
1587	<	* on the call. interrupt the attempted aquireLock
1588	<	* assert that the first lock() call actually locked the lock
1589	<	* assert that the current thread is the one holding the lock
1590	<	*/
1591	<
1592	<	public void testLockedInterruptibly() {
1593	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1594	<	try {lock.writeLock().lockInterruptibly();} catch(Exception e) {}
1595	<	Thread t = new Thread(new Runnable() {
1596	<	public void run() {
1597	<	try {
1598	<	lock.writeLock().lockInterruptibly();
1599	<	fail("Failed to generate an Interrupted Exception");
1600	<	}
1601	<	catch(InterruptedException e) {}
1602	<	}
1603	<	});
1604	<	t.start();
1605	<	t.interrupt();
1519	>	/**
1520	>	* hasWaiters returns true when a thread is waiting, else false
1521	>	*/
1522	>	public void testHasWaiters()      { testHasWaiters(false); }
1523	>	public void testHasWaiters_fair() { testHasWaiters(true); }
1524	>	public void testHasWaiters(boolean fair) {
1525	>	final PublicReentrantReadWriteLock lock =
1526	>	new PublicReentrantReadWriteLock(fair);
1527	>	final Condition c = lock.writeLock().newCondition();
1528	>	final CountDownLatch locked = new CountDownLatch(1);
1529	>	Thread t = newStartedThread(new CheckedRunnable() {
1530	>	public void realRun() throws InterruptedException {
1531	>	lock.writeLock().lock();
1532	>	assertHasNoWaiters(lock, c);
1533	>	assertFalse(lock.hasWaiters(c));
1534	>	locked.countDown();
1535	>	c.await();
1536	>	assertHasNoWaiters(lock, c);
1537	>	assertFalse(lock.hasWaiters(c));
1538	>	lock.writeLock().unlock();
1539	>	}});
1540	>
1541	>	await(locked);
1542	>	lock.writeLock().lock();
1543	>	assertHasWaiters(lock, c, t);
1544	>	assertTrue(lock.hasWaiters(c));
1545	>	c.signal();
1546	>	assertHasNoWaiters(lock, c);
1547	>	assertFalse(lock.hasWaiters(c));
1548	>	lock.writeLock().unlock();
1549	>	awaitTermination(t);
1550	>	assertHasNoWaiters(lock, c);
1551	>	}
1552	>
1553	>	/**
1554	>	* getWaitQueueLength returns number of waiting threads
1555	>	*/
1556	>	public void testGetWaitQueueLength()      { testGetWaitQueueLength(false); }
1557	>	public void testGetWaitQueueLength_fair() { testGetWaitQueueLength(true); }
1558	>	public void testGetWaitQueueLength(boolean fair) {
1559	>	final PublicReentrantReadWriteLock lock =
1560	>	new PublicReentrantReadWriteLock(fair);
1561	>	final Condition c = lock.writeLock().newCondition();
1562	>	final CountDownLatch locked = new CountDownLatch(1);
1563	>	Thread t = newStartedThread(new CheckedRunnable() {
1564	>	public void realRun() throws InterruptedException {
1565	>	lock.writeLock().lock();
1566	>	assertEquals(0, lock.getWaitQueueLength(c));
1567	>	locked.countDown();
1568	>	c.await();
1569	>	lock.writeLock().unlock();
1570	>	}});
1571	>
1572	>	await(locked);
1573	>	lock.writeLock().lock();
1574	>	assertHasWaiters(lock, c, t);
1575	>	assertEquals(1, lock.getWaitQueueLength(c));
1576	>	c.signal();
1577	>	assertHasNoWaiters(lock, c);
1578	>	assertEquals(0, lock.getWaitQueueLength(c));
1579	>	lock.writeLock().unlock();
1580	>	awaitTermination(t);
1581	>	}
1582	>
1583	>	/**
1584	>	* getWaitingThreads returns only and all waiting threads
1585	>	*/
1586	>	public void testGetWaitingThreads()      { testGetWaitingThreads(false); }
1587	>	public void testGetWaitingThreads_fair() { testGetWaitingThreads(true); }
1588	>	public void testGetWaitingThreads(boolean fair) {
1589	>	final PublicReentrantReadWriteLock lock =
1590	>	new PublicReentrantReadWriteLock(fair);
1591	>	final Condition c = lock.writeLock().newCondition();
1592	>	final CountDownLatch locked1 = new CountDownLatch(1);
1593	>	final CountDownLatch locked2 = new CountDownLatch(1);
1594	>	Thread t1 = new Thread(new CheckedRunnable() {
1595	>	public void realRun() throws InterruptedException {
1596	>	lock.writeLock().lock();
1597	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1598	>	locked1.countDown();
1599	>	c.await();
1600	>	lock.writeLock().unlock();
1601	>	}});
1602	>
1603	>	Thread t2 = new Thread(new CheckedRunnable() {
1604	>	public void realRun() throws InterruptedException {
1605	>	lock.writeLock().lock();
1606	>	assertFalse(lock.getWaitingThreads(c).isEmpty());
1607	>	locked2.countDown();
1608	>	c.await();
1609	>	lock.writeLock().unlock();
1610	>	}});
1611	>
1612	>	lock.writeLock().lock();
1613	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1614	>	lock.writeLock().unlock();
1615	>
1616	>	t1.start();
1617	>	await(locked1);
1618	>	t2.start();
1619	>	await(locked2);
1620	>
1621	>	lock.writeLock().lock();
1622	>	assertTrue(lock.hasWaiters(c));
1623	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
1624	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
1625	>	assertEquals(2, lock.getWaitingThreads(c).size());
1626	>	c.signalAll();
1627	>	assertHasNoWaiters(lock, c);
1628	>	lock.writeLock().unlock();
1629	>
1630	>	awaitTermination(t1);
1631	>	awaitTermination(t2);
1632	>
1633	>	assertHasNoWaiters(lock, c);
1634	>	}
1635	>
1636	>	/**
1637	>	* toString indicates current lock state
1638	>	*/
1639	>	public void testToString()      { testToString(false); }
1640	>	public void testToString_fair() { testToString(true); }
1641	>	public void testToString(boolean fair) {
1642	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1643	>	assertTrue(lock.toString().contains("Write locks = 0"));
1644	>	assertTrue(lock.toString().contains("Read locks = 0"));
1645	>	lock.writeLock().lock();
1646	>	assertTrue(lock.toString().contains("Write locks = 1"));
1647	>	assertTrue(lock.toString().contains("Read locks = 0"));
1648	>	lock.writeLock().unlock();
1649	>	lock.readLock().lock();
1650	>	lock.readLock().lock();
1651	>	assertTrue(lock.toString().contains("Write locks = 0"));
1652	>	assertTrue(lock.toString().contains("Read locks = 2"));
1653	>	}
1654	>
1655	>	/**
1656	>	* readLock.toString indicates current lock state
1657	>	*/
1658	>	public void testReadLockToString()      { testReadLockToString(false); }
1659	>	public void testReadLockToString_fair() { testReadLockToString(true); }
1660	>	public void testReadLockToString(boolean fair) {
1661	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1662	>	assertTrue(lock.readLock().toString().contains("Read locks = 0"));
1663	>	lock.readLock().lock();
1664	>	lock.readLock().lock();
1665	>	assertTrue(lock.readLock().toString().contains("Read locks = 2"));
1666	>	}
1667	>
1668	>	/**
1669	>	* writeLock.toString indicates current lock state
1670	>	*/
1671	>	public void testWriteLockToString()      { testWriteLockToString(false); }
1672	>	public void testWriteLockToString_fair() { testWriteLockToString(true); }
1673	>	public void testWriteLockToString(boolean fair) {
1674	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1675	>	assertTrue(lock.writeLock().toString().contains("Unlocked"));
1676	>	lock.writeLock().lock();
1677	>	assertTrue(lock.writeLock().toString().contains("Locked"));
1678	>	lock.writeLock().unlock();
1679	>	assertTrue(lock.writeLock().toString().contains("Unlocked"));
1680		}
112	–
1681
1682		}

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