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Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.1 by dl, Sun Aug 31 19:24:55 2003 UTC vs.
Revision 1.75 by jsr166, Fri Jul 3 00:23:43 2015 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	>	main(suite(), args);
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 "indefinitely" using the specified AwaitMethod.
159	>	*/
160	>	void await(Condition c, AwaitMethod awaitMethod)
161	>	throws InterruptedException {
162	>	long timeoutMillis = 2 * LONG_DELAY_MS;
163	>	switch (awaitMethod) {
164	>	case await:
165	>	c.await();
166	>	break;
167	>	case awaitTimed:
168	>	assertTrue(c.await(timeoutMillis, MILLISECONDS));
169	>	break;
170	>	case awaitNanos:
171	>	long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis);
172	>	long nanosRemaining = c.awaitNanos(timeoutNanos);
173	>	assertTrue(nanosRemaining > 0);
174	>	assertTrue(nanosRemaining <= timeoutNanos);
175	>	break;
176	>	case awaitUntil:
177	>	assertTrue(c.awaitUntil(delayedDate(timeoutMillis)));
178	>	break;
179	>	default:
180	>	throw new AssertionError();
181	>	}
182	>	}
183	>
184	>	/**
185	>	* Constructor sets given fairness, and is in unlocked state
186	>	*/
187	>	public void testConstructor() {
188	>	PublicReentrantReadWriteLock lock;
189	>
190	>	lock = new PublicReentrantReadWriteLock();
191	>	assertFalse(lock.isFair());
192	>	assertNotWriteLocked(lock);
193	>	assertEquals(0, lock.getReadLockCount());
194	>
195	>	lock = new PublicReentrantReadWriteLock(true);
196	>	assertTrue(lock.isFair());
197	>	assertNotWriteLocked(lock);
198	>	assertEquals(0, lock.getReadLockCount());
199	>
200	>	lock = new PublicReentrantReadWriteLock(false);
201	>	assertFalse(lock.isFair());
202	>	assertNotWriteLocked(lock);
203	>	assertEquals(0, lock.getReadLockCount());
204	>	}
205	>
206	>	/**
207	>	* write-locking and read-locking an unlocked lock succeed
208	>	*/
209	>	public void testLock()      { testLock(false); }
210	>	public void testLock_fair() { testLock(true); }
211	>	public void testLock(boolean fair) {
212	>	PublicReentrantReadWriteLock lock =
213	>	new PublicReentrantReadWriteLock(fair);
214	>	assertNotWriteLocked(lock);
215	>	lock.writeLock().lock();
216	>	assertWriteLockedByMoi(lock);
217	>	lock.writeLock().unlock();
218	>	assertNotWriteLocked(lock);
219	>	assertEquals(0, lock.getReadLockCount());
220	>	lock.readLock().lock();
221	>	assertNotWriteLocked(lock);
222	>	assertEquals(1, lock.getReadLockCount());
223	>	lock.readLock().unlock();
224	>	assertNotWriteLocked(lock);
225	>	assertEquals(0, lock.getReadLockCount());
226	>	}
227	>
228	>	/**
229	>	* getWriteHoldCount returns number of recursive holds
230	>	*/
231	>	public void testGetWriteHoldCount()      { testGetWriteHoldCount(false); }
232	>	public void testGetWriteHoldCount_fair() { testGetWriteHoldCount(true); }
233	>	public void testGetWriteHoldCount(boolean fair) {
234	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
235	>	for (int i = 1; i <= SIZE; i++) {
236	>	lock.writeLock().lock();
237	>	assertEquals(i,lock.getWriteHoldCount());
238	>	}
239	>	for (int i = SIZE; i > 0; i--) {
240	>	lock.writeLock().unlock();
241	>	assertEquals(i - 1,lock.getWriteHoldCount());
242	>	}
243	>	}
244	>
245	>	/**
246	>	* writelock.getHoldCount returns number of recursive holds
247	>	*/
248	>	public void testGetHoldCount()      { testGetHoldCount(false); }
249	>	public void testGetHoldCount_fair() { testGetHoldCount(true); }
250	>	public void testGetHoldCount(boolean fair) {
251	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
252	>	for (int i = 1; i <= SIZE; i++) {
253	>	lock.writeLock().lock();
254	>	assertEquals(i,lock.writeLock().getHoldCount());
255	>	}
256	>	for (int i = SIZE; i > 0; i--) {
257	>	lock.writeLock().unlock();
258	>	assertEquals(i - 1,lock.writeLock().getHoldCount());
259	>	}
260	>	}
261	>
262	>	/**
263	>	* getReadHoldCount returns number of recursive holds
264	>	*/
265	>	public void testGetReadHoldCount()      { testGetReadHoldCount(false); }
266	>	public void testGetReadHoldCount_fair() { testGetReadHoldCount(true); }
267	>	public void testGetReadHoldCount(boolean fair) {
268	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
269	>	for (int i = 1; i <= SIZE; i++) {
270	>	lock.readLock().lock();
271	>	assertEquals(i,lock.getReadHoldCount());
272	>	}
273	>	for (int i = SIZE; i > 0; i--) {
274	>	lock.readLock().unlock();
275	>	assertEquals(i - 1,lock.getReadHoldCount());
276	>	}
277	>	}
278	>
279	>	/**
280	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
281	>	*/
282	>	public void testWriteUnlock_IMSE()      { testWriteUnlock_IMSE(false); }
283	>	public void testWriteUnlock_IMSE_fair() { testWriteUnlock_IMSE(true); }
284	>	public void testWriteUnlock_IMSE(boolean fair) {
285	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
286	>	try {
287	>	lock.writeLock().unlock();
288	>	shouldThrow();
289	>	} catch (IllegalMonitorStateException success) {}
290	>	}
291	>
292	>	/**
293	>	* read-unlocking an unlocked lock throws IllegalMonitorStateException
294	>	*/
295	>	public void testReadUnlock_IMSE()      { testReadUnlock_IMSE(false); }
296	>	public void testReadUnlock_IMSE_fair() { testReadUnlock_IMSE(true); }
297	>	public void testReadUnlock_IMSE(boolean fair) {
298	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
299	>	try {
300	>	lock.readLock().unlock();
301	>	shouldThrow();
302	>	} catch (IllegalMonitorStateException success) {}
303	>	}
304	>
305	>	/**
306	>	* write-lockInterruptibly is interruptible
307	>	*/
308	>	public void testWriteLockInterruptibly_Interruptible()      { testWriteLockInterruptibly_Interruptible(false); }
309	>	public void testWriteLockInterruptibly_Interruptible_fair() { testWriteLockInterruptibly_Interruptible(true); }
310	>	public void testWriteLockInterruptibly_Interruptible(boolean fair) {
311	>	final PublicReentrantReadWriteLock lock =
312	>	new PublicReentrantReadWriteLock(fair);
313	>	lock.writeLock().lock();
314	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
315	>	public void realRun() throws InterruptedException {
316	>	lock.writeLock().lockInterruptibly();
317	>	}});
318	>
319	>	waitForQueuedThread(lock, t);
320	>	t.interrupt();
321	>	awaitTermination(t);
322	>	releaseWriteLock(lock);
323	>	}
324	>
325	>	/**
326	>	* timed write-tryLock is interruptible
327	>	*/
328	>	public void testWriteTryLock_Interruptible()      { testWriteTryLock_Interruptible(false); }
329	>	public void testWriteTryLock_Interruptible_fair() { testWriteTryLock_Interruptible(true); }
330	>	public void testWriteTryLock_Interruptible(boolean fair) {
331	>	final PublicReentrantReadWriteLock lock =
332	>	new PublicReentrantReadWriteLock(fair);
333	>	lock.writeLock().lock();
334	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
335	>	public void realRun() throws InterruptedException {
336	>	lock.writeLock().tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
337	>	}});
338	>
339	>	waitForQueuedThread(lock, t);
340	>	t.interrupt();
341	>	awaitTermination(t);
342	>	releaseWriteLock(lock);
343	>	}
344	>
345	>	/**
346	>	* read-lockInterruptibly is interruptible
347	>	*/
348	>	public void testReadLockInterruptibly_Interruptible()      { testReadLockInterruptibly_Interruptible(false); }
349	>	public void testReadLockInterruptibly_Interruptible_fair() { testReadLockInterruptibly_Interruptible(true); }
350	>	public void testReadLockInterruptibly_Interruptible(boolean fair) {
351	>	final PublicReentrantReadWriteLock lock =
352	>	new PublicReentrantReadWriteLock(fair);
353	>	lock.writeLock().lock();
354	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
355	>	public void realRun() throws InterruptedException {
356	>	lock.readLock().lockInterruptibly();
357	>	}});
358	>
359	>	waitForQueuedThread(lock, t);
360	>	t.interrupt();
361	>	awaitTermination(t);
362	>	releaseWriteLock(lock);
363	>	}
364	>
365	>	/**
366	>	* timed read-tryLock is interruptible
367	>	*/
368	>	public void testReadTryLock_Interruptible()      { testReadTryLock_Interruptible(false); }
369	>	public void testReadTryLock_Interruptible_fair() { testReadTryLock_Interruptible(true); }
370	>	public void testReadTryLock_Interruptible(boolean fair) {
371	>	final PublicReentrantReadWriteLock lock =
372	>	new PublicReentrantReadWriteLock(fair);
373	>	lock.writeLock().lock();
374	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
375	>	public void realRun() throws InterruptedException {
376	>	lock.readLock().tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
377	>	}});
378	>
379	>	waitForQueuedThread(lock, t);
380	>	t.interrupt();
381	>	awaitTermination(t);
382	>	releaseWriteLock(lock);
383	>	}
384	>
385	>	/**
386	>	* write-tryLock on an unlocked lock succeeds
387	>	*/
388	>	public void testWriteTryLock()      { testWriteTryLock(false); }
389	>	public void testWriteTryLock_fair() { testWriteTryLock(true); }
390	>	public void testWriteTryLock(boolean fair) {
391	>	final PublicReentrantReadWriteLock lock =
392	>	new PublicReentrantReadWriteLock(fair);
393	>	assertTrue(lock.writeLock().tryLock());
394	>	assertWriteLockedByMoi(lock);
395	>	assertTrue(lock.writeLock().tryLock());
396	>	assertWriteLockedByMoi(lock);
397	>	lock.writeLock().unlock();
398	>	releaseWriteLock(lock);
399	>	}
400	>
401	>	/**
402	>	* write-tryLock fails if locked
403	>	*/
404	>	public void testWriteTryLockWhenLocked()      { testWriteTryLockWhenLocked(false); }
405	>	public void testWriteTryLockWhenLocked_fair() { testWriteTryLockWhenLocked(true); }
406	>	public void testWriteTryLockWhenLocked(boolean fair) {
407	>	final PublicReentrantReadWriteLock lock =
408	>	new PublicReentrantReadWriteLock(fair);
409	>	lock.writeLock().lock();
410	>	Thread t = newStartedThread(new CheckedRunnable() {
411	>	public void realRun() {
412	>	assertFalse(lock.writeLock().tryLock());
413	>	}});
414	>
415	>	awaitTermination(t);
416	>	releaseWriteLock(lock);
417	>	}
418	>
419	>	/**
420	>	* read-tryLock fails if locked
421	>	*/
422	>	public void testReadTryLockWhenLocked()      { testReadTryLockWhenLocked(false); }
423	>	public void testReadTryLockWhenLocked_fair() { testReadTryLockWhenLocked(true); }
424	>	public void testReadTryLockWhenLocked(boolean fair) {
425	>	final PublicReentrantReadWriteLock lock =
426	>	new PublicReentrantReadWriteLock(fair);
427	>	lock.writeLock().lock();
428	>	Thread t = newStartedThread(new CheckedRunnable() {
429	>	public void realRun() {
430	>	assertFalse(lock.readLock().tryLock());
431	>	}});
432	>
433	>	awaitTermination(t);
434	>	releaseWriteLock(lock);
435	>	}
436	>
437	>	/**
438	>	* Multiple threads can hold a read lock when not write-locked
439	>	*/
440	>	public void testMultipleReadLocks()      { testMultipleReadLocks(false); }
441	>	public void testMultipleReadLocks_fair() { testMultipleReadLocks(true); }
442	>	public void testMultipleReadLocks(boolean fair) {
443	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
444	>	lock.readLock().lock();
445	>	Thread t = newStartedThread(new CheckedRunnable() {
446	>	public void realRun() throws InterruptedException {
447	>	assertTrue(lock.readLock().tryLock());
448	>	lock.readLock().unlock();
449	>	assertTrue(lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS));
450	>	lock.readLock().unlock();
451	>	lock.readLock().lock();
452	>	lock.readLock().unlock();
453	>	}});
454	>
455	>	awaitTermination(t);
456	>	lock.readLock().unlock();
457	>	}
458	>
459	>	/**
460	>	* A writelock succeeds only after a reading thread unlocks
461	>	*/
462	>	public void testWriteAfterReadLock()      { testWriteAfterReadLock(false); }
463	>	public void testWriteAfterReadLock_fair() { testWriteAfterReadLock(true); }
464	>	public void testWriteAfterReadLock(boolean fair) {
465	>	final PublicReentrantReadWriteLock lock =
466	>	new PublicReentrantReadWriteLock(fair);
467	>	lock.readLock().lock();
468	>	Thread t = newStartedThread(new CheckedRunnable() {
469	>	public void realRun() {
470	>	assertEquals(1, lock.getReadLockCount());
471	>	lock.writeLock().lock();
472	>	assertEquals(0, lock.getReadLockCount());
473	>	lock.writeLock().unlock();
474	>	}});
475	>	waitForQueuedThread(lock, t);
476	>	assertNotWriteLocked(lock);
477	>	assertEquals(1, lock.getReadLockCount());
478	>	lock.readLock().unlock();
479	>	assertEquals(0, lock.getReadLockCount());
480	>	awaitTermination(t);
481	>	assertNotWriteLocked(lock);
482	>	}
483	>
484	>	/**
485	>	* A writelock succeeds only after reading threads unlock
486	>	*/
487	>	public void testWriteAfterMultipleReadLocks()      { testWriteAfterMultipleReadLocks(false); }
488	>	public void testWriteAfterMultipleReadLocks_fair() { testWriteAfterMultipleReadLocks(true); }
489	>	public void testWriteAfterMultipleReadLocks(boolean fair) {
490	>	final PublicReentrantReadWriteLock lock =
491	>	new PublicReentrantReadWriteLock(fair);
492	>	lock.readLock().lock();
493	>	lock.readLock().lock();
494	>	Thread t1 = newStartedThread(new CheckedRunnable() {
495	>	public void realRun() {
496	>	lock.readLock().lock();
497	>	assertEquals(3, lock.getReadLockCount());
498	>	lock.readLock().unlock();
499	>	}});
500	>	awaitTermination(t1);
501	>
502	>	Thread t2 = newStartedThread(new CheckedRunnable() {
503	>	public void realRun() {
504	>	assertEquals(2, lock.getReadLockCount());
505	>	lock.writeLock().lock();
506	>	assertEquals(0, lock.getReadLockCount());
507	>	lock.writeLock().unlock();
508	>	}});
509	>	waitForQueuedThread(lock, t2);
510	>	assertNotWriteLocked(lock);
511	>	assertEquals(2, lock.getReadLockCount());
512	>	lock.readLock().unlock();
513	>	lock.readLock().unlock();
514	>	assertEquals(0, lock.getReadLockCount());
515	>	awaitTermination(t2);
516	>	assertNotWriteLocked(lock);
517	>	}
518	>
519	>	/**
520	>	* A thread that tries to acquire a fair read lock (non-reentrantly)
521	>	* will block if there is a waiting writer thread
522	>	*/
523	>	public void testReaderWriterReaderFairFifo() {
524	>	final PublicReentrantReadWriteLock lock =
525	>	new PublicReentrantReadWriteLock(true);
526	>	final AtomicBoolean t1GotLock = new AtomicBoolean(false);
527	>
528	>	lock.readLock().lock();
529	>	Thread t1 = newStartedThread(new CheckedRunnable() {
530	>	public void realRun() {
531	>	assertEquals(1, lock.getReadLockCount());
532	>	lock.writeLock().lock();
533	>	assertEquals(0, lock.getReadLockCount());
534	>	t1GotLock.set(true);
535	>	lock.writeLock().unlock();
536	>	}});
537	>	waitForQueuedThread(lock, t1);
538	>
539	>	Thread t2 = newStartedThread(new CheckedRunnable() {
540	>	public void realRun() {
541	>	assertEquals(1, lock.getReadLockCount());
542	>	lock.readLock().lock();
543	>	assertEquals(1, lock.getReadLockCount());
544	>	assertTrue(t1GotLock.get());
545	>	lock.readLock().unlock();
546	>	}});
547	>	waitForQueuedThread(lock, t2);
548	>	assertTrue(t1.isAlive());
549	>	assertNotWriteLocked(lock);
550	>	assertEquals(1, lock.getReadLockCount());
551	>	lock.readLock().unlock();
552	>	awaitTermination(t1);
553	>	awaitTermination(t2);
554	>	assertNotWriteLocked(lock);
555	>	}
556	>
557	>	/**
558	>	* Readlocks succeed only after a writing thread unlocks
559	>	*/
560	>	public void testReadAfterWriteLock()      { testReadAfterWriteLock(false); }
561	>	public void testReadAfterWriteLock_fair() { testReadAfterWriteLock(true); }
562	>	public void testReadAfterWriteLock(boolean fair) {
563	>	final PublicReentrantReadWriteLock lock =
564	>	new PublicReentrantReadWriteLock(fair);
565	>	lock.writeLock().lock();
566	>	Thread t1 = newStartedThread(new CheckedRunnable() {
567	>	public void realRun() {
568	>	lock.readLock().lock();
569	>	lock.readLock().unlock();
570	>	}});
571	>	Thread t2 = newStartedThread(new CheckedRunnable() {
572	>	public void realRun() {
573	>	lock.readLock().lock();
574	>	lock.readLock().unlock();
575	>	}});
576	>
577	>	waitForQueuedThread(lock, t1);
578	>	waitForQueuedThread(lock, t2);
579	>	releaseWriteLock(lock);
580	>	awaitTermination(t1);
581	>	awaitTermination(t2);
582	>	}
583	>
584	>	/**
585	>	* Read trylock succeeds if write locked by current thread
586	>	*/
587	>	public void testReadHoldingWriteLock()      { testReadHoldingWriteLock(false); }
588	>	public void testReadHoldingWriteLock_fair() { testReadHoldingWriteLock(true); }
589	>	public void testReadHoldingWriteLock(boolean fair) {
590	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
591	>	lock.writeLock().lock();
592	>	assertTrue(lock.readLock().tryLock());
593	>	lock.readLock().unlock();
594	>	lock.writeLock().unlock();
595	>	}
596	>
597	>	/**
598	>	* Read trylock succeeds (barging) even in the presence of waiting
599	>	* readers and/or writers
600	>	*/
601	>	public void testReadTryLockBarging()      { testReadTryLockBarging(false); }
602	>	public void testReadTryLockBarging_fair() { testReadTryLockBarging(true); }
603	>	public void testReadTryLockBarging(boolean fair) {
604	>	final PublicReentrantReadWriteLock lock =
605	>	new PublicReentrantReadWriteLock(fair);
606	>	lock.readLock().lock();
607	>
608	>	Thread t1 = newStartedThread(new CheckedRunnable() {
609	>	public void realRun() {
610	>	lock.writeLock().lock();
611	>	lock.writeLock().unlock();
612	>	}});
613	>
614	>	waitForQueuedThread(lock, t1);
615	>
616	>	Thread t2 = newStartedThread(new CheckedRunnable() {
617	>	public void realRun() {
618	>	lock.readLock().lock();
619	>	lock.readLock().unlock();
620	>	}});
621	>
622	>	if (fair)
623	>	waitForQueuedThread(lock, t2);
624	>
625	>	Thread t3 = newStartedThread(new CheckedRunnable() {
626	>	public void realRun() {
627	>	lock.readLock().tryLock();
628	>	lock.readLock().unlock();
629	>	}});
630	>
631	>	assertTrue(lock.getReadLockCount() > 0);
632	>	awaitTermination(t3);
633	>	assertTrue(t1.isAlive());
634	>	if (fair) assertTrue(t2.isAlive());
635	>	lock.readLock().unlock();
636	>	awaitTermination(t1);
637	>	awaitTermination(t2);
638	>	}
639	>
640	>	/**
641	>	* Read lock succeeds if write locked by current thread even if
642	>	* other threads are waiting for readlock
643	>	*/
644	>	public void testReadHoldingWriteLock2()      { testReadHoldingWriteLock2(false); }
645	>	public void testReadHoldingWriteLock2_fair() { testReadHoldingWriteLock2(true); }
646	>	public void testReadHoldingWriteLock2(boolean fair) {
647	>	final PublicReentrantReadWriteLock lock =
648	>	new PublicReentrantReadWriteLock(fair);
649	>	lock.writeLock().lock();
650	>	lock.readLock().lock();
651	>	lock.readLock().unlock();
652	>
653	>	Thread t1 = newStartedThread(new CheckedRunnable() {
654	>	public void realRun() {
655	>	lock.readLock().lock();
656	>	lock.readLock().unlock();
657	>	}});
658	>	Thread t2 = newStartedThread(new CheckedRunnable() {
659	>	public void realRun() {
660	>	lock.readLock().lock();
661	>	lock.readLock().unlock();
662	>	}});
663	>
664	>	waitForQueuedThread(lock, t1);
665	>	waitForQueuedThread(lock, t2);
666	>	assertWriteLockedByMoi(lock);
667	>	lock.readLock().lock();
668	>	lock.readLock().unlock();
669	>	releaseWriteLock(lock);
670	>	awaitTermination(t1);
671	>	awaitTermination(t2);
672	>	}
673	>
674	>	/**
675	>	* Read lock succeeds if write locked by current thread even if
676	>	* other threads are waiting for writelock
677	>	*/
678	>	public void testReadHoldingWriteLock3()      { testReadHoldingWriteLock3(false); }
679	>	public void testReadHoldingWriteLock3_fair() { testReadHoldingWriteLock3(true); }
680	>	public void testReadHoldingWriteLock3(boolean fair) {
681	>	final PublicReentrantReadWriteLock lock =
682	>	new PublicReentrantReadWriteLock(fair);
683	>	lock.writeLock().lock();
684	>	lock.readLock().lock();
685	>	lock.readLock().unlock();
686	>
687	>	Thread t1 = newStartedThread(new CheckedRunnable() {
688	>	public void realRun() {
689	>	lock.writeLock().lock();
690	>	lock.writeLock().unlock();
691	>	}});
692	>	Thread t2 = newStartedThread(new CheckedRunnable() {
693	>	public void realRun() {
694	>	lock.writeLock().lock();
695	>	lock.writeLock().unlock();
696	>	}});
697	>
698	>	waitForQueuedThread(lock, t1);
699	>	waitForQueuedThread(lock, t2);
700	>	assertWriteLockedByMoi(lock);
701	>	lock.readLock().lock();
702	>	lock.readLock().unlock();
703	>	assertWriteLockedByMoi(lock);
704	>	lock.writeLock().unlock();
705	>	awaitTermination(t1);
706	>	awaitTermination(t2);
707	>	}
708	>
709	>	/**
710	>	* Write lock succeeds if write locked by current thread even if
711	>	* other threads are waiting for writelock
712	>	*/
713	>	public void testWriteHoldingWriteLock4()      { testWriteHoldingWriteLock4(false); }
714	>	public void testWriteHoldingWriteLock4_fair() { testWriteHoldingWriteLock4(true); }
715	>	public void testWriteHoldingWriteLock4(boolean fair) {
716	>	final PublicReentrantReadWriteLock lock =
717	>	new PublicReentrantReadWriteLock(fair);
718	>	lock.writeLock().lock();
719	>	lock.writeLock().lock();
720	>	lock.writeLock().unlock();
721	>
722	>	Thread t1 = newStartedThread(new CheckedRunnable() {
723	>	public void realRun() {
724	>	lock.writeLock().lock();
725	>	lock.writeLock().unlock();
726	>	}});
727	>	Thread t2 = newStartedThread(new CheckedRunnable() {
728	>	public void realRun() {
729	>	lock.writeLock().lock();
730	>	lock.writeLock().unlock();
731	>	}});
732	>
733	>	waitForQueuedThread(lock, t1);
734	>	waitForQueuedThread(lock, t2);
735	>	assertWriteLockedByMoi(lock);
736	>	assertEquals(1, lock.getWriteHoldCount());
737	>	lock.writeLock().lock();
738	>	assertWriteLockedByMoi(lock);
739	>	assertEquals(2, lock.getWriteHoldCount());
740	>	lock.writeLock().unlock();
741	>	assertWriteLockedByMoi(lock);
742	>	assertEquals(1, lock.getWriteHoldCount());
743	>	lock.writeLock().unlock();
744	>	awaitTermination(t1);
745	>	awaitTermination(t2);
746	>	}
747	>
748	>	/**
749	>	* Read tryLock succeeds if readlocked but not writelocked
750	>	*/
751	>	public void testTryLockWhenReadLocked()      { testTryLockWhenReadLocked(false); }
752	>	public void testTryLockWhenReadLocked_fair() { testTryLockWhenReadLocked(true); }
753	>	public void testTryLockWhenReadLocked(boolean fair) {
754	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
755	>	lock.readLock().lock();
756	>	Thread t = newStartedThread(new CheckedRunnable() {
757	>	public void realRun() {
758	>	assertTrue(lock.readLock().tryLock());
759	>	lock.readLock().unlock();
760	>	}});
761	>
762	>	awaitTermination(t);
763	>	lock.readLock().unlock();
764	>	}
765	>
766	>	/**
767	>	* write tryLock fails when readlocked
768	>	*/
769	>	public void testWriteTryLockWhenReadLocked()      { testWriteTryLockWhenReadLocked(false); }
770	>	public void testWriteTryLockWhenReadLocked_fair() { testWriteTryLockWhenReadLocked(true); }
771	>	public void testWriteTryLockWhenReadLocked(boolean fair) {
772	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
773	>	lock.readLock().lock();
774	>	Thread t = newStartedThread(new CheckedRunnable() {
775	>	public void realRun() {
776	>	assertFalse(lock.writeLock().tryLock());
777	>	}});
778	>
779	>	awaitTermination(t);
780	>	lock.readLock().unlock();
781	>	}
782	>
783	>	/**
784	>	* write timed tryLock times out if locked
785	>	*/
786	>	public void testWriteTryLock_Timeout()      { testWriteTryLock_Timeout(false); }
787	>	public void testWriteTryLock_Timeout_fair() { testWriteTryLock_Timeout(true); }
788	>	public void testWriteTryLock_Timeout(boolean fair) {
789	>	final PublicReentrantReadWriteLock lock =
790	>	new PublicReentrantReadWriteLock(fair);
791	>	lock.writeLock().lock();
792	>	Thread t = newStartedThread(new CheckedRunnable() {
793	>	public void realRun() throws InterruptedException {
794	>	long startTime = System.nanoTime();
795	>	long timeoutMillis = 10;
796	>	assertFalse(lock.writeLock().tryLock(timeoutMillis, MILLISECONDS));
797	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
798	>	}});
799	>
800	>	awaitTermination(t);
801	>	releaseWriteLock(lock);
802	>	}
803	>
804	>	/**
805	>	* read timed tryLock times out if write-locked
806	>	*/
807	>	public void testReadTryLock_Timeout()      { testReadTryLock_Timeout(false); }
808	>	public void testReadTryLock_Timeout_fair() { testReadTryLock_Timeout(true); }
809	>	public void testReadTryLock_Timeout(boolean fair) {
810	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
811	>	lock.writeLock().lock();
812	>	Thread t = newStartedThread(new CheckedRunnable() {
813	>	public void realRun() throws InterruptedException {
814	>	long startTime = System.nanoTime();
815	>	long timeoutMillis = 10;
816	>	assertFalse(lock.readLock().tryLock(timeoutMillis, MILLISECONDS));
817	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
818	>	}});
819	>
820	>	awaitTermination(t);
821	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
822	>	lock.writeLock().unlock();
823	>	}
824	>
825	>	/**
826	>	* write lockInterruptibly succeeds if unlocked, else is interruptible
827	>	*/
828	>	public void testWriteLockInterruptibly()      { testWriteLockInterruptibly(false); }
829	>	public void testWriteLockInterruptibly_fair() { testWriteLockInterruptibly(true); }
830	>	public void testWriteLockInterruptibly(boolean fair) {
831	>	final PublicReentrantReadWriteLock lock =
832	>	new PublicReentrantReadWriteLock(fair);
833	>	try {
834	>	lock.writeLock().lockInterruptibly();
835	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
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 fail) { threadUnexpectedException(fail); }
861	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
862	>	public void realRun() throws InterruptedException {
863	>	lock.readLock().lockInterruptibly();
864	>	}});
865	>
866	>	waitForQueuedThread(lock, t);
867	>	t.interrupt();
868	>	awaitTermination(t);
869	>	releaseWriteLock(lock);
870	>	}
871	>
872	>	/**
873	>	* Calling await without holding lock throws IllegalMonitorStateException
874	>	*/
875	>	public void testAwait_IMSE()      { testAwait_IMSE(false); }
876	>	public void testAwait_IMSE_fair() { testAwait_IMSE(true); }
877	>	public void testAwait_IMSE(boolean fair) {
878	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
879	>	final Condition c = lock.writeLock().newCondition();
880	>	for (AwaitMethod awaitMethod : AwaitMethod.values()) {
881	>	long startTime = System.nanoTime();
882	>	try {
883	>	await(c, awaitMethod);
884	>	shouldThrow();
885	>	} catch (IllegalMonitorStateException success) {
886	>	} catch (InterruptedException fail) {
887	>	threadUnexpectedException(fail);
888	>	}
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 fail) { threadUnexpectedException(fail); }
940	>	}
941	>
942	>	/**
943	>	* timed await without a signal times out
944	>	*/
945	>	public void testAwait_Timeout()      { testAwait_Timeout(false); }
946	>	public void testAwait_Timeout_fair() { testAwait_Timeout(true); }
947	>	public void testAwait_Timeout(boolean fair) {
948	>	try {
949	>	final ReentrantReadWriteLock lock =
950	>	new ReentrantReadWriteLock(fair);
951	>	final Condition c = lock.writeLock().newCondition();
952	>	lock.writeLock().lock();
953	>	long startTime = System.nanoTime();
954	>	long timeoutMillis = 10;
955	>	assertFalse(c.await(timeoutMillis, MILLISECONDS));
956	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
957	>	lock.writeLock().unlock();
958	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
959	>	}
960	>
961	>	/**
962	>	* awaitUntil without a signal times out
963	>	*/
964	>	public void testAwaitUntil_Timeout()      { testAwaitUntil_Timeout(false); }
965	>	public void testAwaitUntil_Timeout_fair() { testAwaitUntil_Timeout(true); }
966	>	public void testAwaitUntil_Timeout(boolean fair) {
967	>	try {
968	>	final ReentrantReadWriteLock lock =
969	>	new ReentrantReadWriteLock(fair);
970	>	final Condition c = lock.writeLock().newCondition();
971	>	lock.writeLock().lock();
972	>	long startTime = System.nanoTime();
973	>	long timeoutMillis = 10;
974	>	java.util.Date d = new java.util.Date();
975	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + timeoutMillis)));
976	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
977	>	lock.writeLock().unlock();
978	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
979	>	}
980	>
981	>	/**
982	>	* await returns when signalled
983	>	*/
984	>	public void testAwait()      { testAwait(false); }
985	>	public void testAwait_fair() { testAwait(true); }
986	>	public void testAwait(boolean fair) {
987	>	final PublicReentrantReadWriteLock lock =
988	>	new PublicReentrantReadWriteLock(fair);
989	>	final Condition c = lock.writeLock().newCondition();
990	>	final CountDownLatch locked = new CountDownLatch(1);
991	>	Thread t = newStartedThread(new CheckedRunnable() {
992	>	public void realRun() throws InterruptedException {
993	>	lock.writeLock().lock();
994	>	locked.countDown();
995	>	c.await();
996	>	lock.writeLock().unlock();
997	>	}});
998	>
999	>	await(locked);
1000	>	lock.writeLock().lock();
1001	>	assertHasWaiters(lock, c, t);
1002	>	c.signal();
1003	>	assertHasNoWaiters(lock, c);
1004	>	assertTrue(t.isAlive());
1005	>	lock.writeLock().unlock();
1006	>	awaitTermination(t);
1007	>	}
1008	>
1009	>	/**
1010	>	* awaitUninterruptibly is uninterruptible
1011	>	*/
1012	>	public void testAwaitUninterruptibly()      { testAwaitUninterruptibly(false); }
1013	>	public void testAwaitUninterruptibly_fair() { testAwaitUninterruptibly(true); }
1014	>	public void testAwaitUninterruptibly(boolean fair) {
1015	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1016	>	final Condition c = lock.writeLock().newCondition();
1017	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(2);
1018	>
1019	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1020	>	public void realRun() {
1021	>	// Interrupt before awaitUninterruptibly
1022	>	lock.writeLock().lock();
1023	>	pleaseInterrupt.countDown();
1024	>	Thread.currentThread().interrupt();
1025	>	c.awaitUninterruptibly();
1026	>	assertTrue(Thread.interrupted());
1027	>	lock.writeLock().unlock();
1028	>	}});
1029	>
1030	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1031	>	public void realRun() {
1032	>	// Interrupt during awaitUninterruptibly
1033	>	lock.writeLock().lock();
1034	>	pleaseInterrupt.countDown();
1035	>	c.awaitUninterruptibly();
1036	>	assertTrue(Thread.interrupted());
1037	>	lock.writeLock().unlock();
1038	>	}});
1039	>
1040	>	await(pleaseInterrupt);
1041	>	lock.writeLock().lock();
1042	>	lock.writeLock().unlock();
1043	>	t2.interrupt();
1044	>
1045	>	assertThreadStaysAlive(t1);
1046	>	assertTrue(t2.isAlive());
1047	>
1048	>	lock.writeLock().lock();
1049	>	c.signalAll();
1050	>	lock.writeLock().unlock();
1051	>
1052	>	awaitTermination(t1);
1053	>	awaitTermination(t2);
1054	>	}
1055	>
1056	>	/**
1057	>	* await/awaitNanos/awaitUntil is interruptible
1058	>	*/
1059	>	public void testInterruptible_await()           { testInterruptible(false, AwaitMethod.await); }
1060	>	public void testInterruptible_await_fair()      { testInterruptible(true,  AwaitMethod.await); }
1061	>	public void testInterruptible_awaitTimed()      { testInterruptible(false, AwaitMethod.awaitTimed); }
1062	>	public void testInterruptible_awaitTimed_fair() { testInterruptible(true,  AwaitMethod.awaitTimed); }
1063	>	public void testInterruptible_awaitNanos()      { testInterruptible(false, AwaitMethod.awaitNanos); }
1064	>	public void testInterruptible_awaitNanos_fair() { testInterruptible(true,  AwaitMethod.awaitNanos); }
1065	>	public void testInterruptible_awaitUntil()      { testInterruptible(false, AwaitMethod.awaitUntil); }
1066	>	public void testInterruptible_awaitUntil_fair() { testInterruptible(true,  AwaitMethod.awaitUntil); }
1067	>	public void testInterruptible(boolean fair, final AwaitMethod awaitMethod) {
1068	>	final PublicReentrantReadWriteLock lock =
1069	>	new PublicReentrantReadWriteLock(fair);
1070	>	final Condition c = lock.writeLock().newCondition();
1071	>	final CountDownLatch locked = new CountDownLatch(1);
1072	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1073	>	public void realRun() throws InterruptedException {
1074	>	lock.writeLock().lock();
1075	>	assertWriteLockedByMoi(lock);
1076	>	assertHasNoWaiters(lock, c);
1077	>	locked.countDown();
1078	>	try {
1079	>	await(c, awaitMethod);
1080	>	} finally {
1081	>	assertWriteLockedByMoi(lock);
1082	>	assertHasNoWaiters(lock, c);
1083	>	lock.writeLock().unlock();
1084	>	assertFalse(Thread.interrupted());
1085	>	}
1086	>	}});
1087	>
1088	>	await(locked);
1089	>	assertHasWaiters(lock, c, t);
1090	>	t.interrupt();
1091	>	awaitTermination(t);
1092	>	assertNotWriteLocked(lock);
1093	>	}
1094	>
1095	>	/**
1096	>	* signalAll wakes up all threads
1097	>	*/
1098	>	public void testSignalAll_await()           { testSignalAll(false, AwaitMethod.await); }
1099	>	public void testSignalAll_await_fair()      { testSignalAll(true,  AwaitMethod.await); }
1100	>	public void testSignalAll_awaitTimed()      { testSignalAll(false, AwaitMethod.awaitTimed); }
1101	>	public void testSignalAll_awaitTimed_fair() { testSignalAll(true,  AwaitMethod.awaitTimed); }
1102	>	public void testSignalAll_awaitNanos()      { testSignalAll(false, AwaitMethod.awaitNanos); }
1103	>	public void testSignalAll_awaitNanos_fair() { testSignalAll(true,  AwaitMethod.awaitNanos); }
1104	>	public void testSignalAll_awaitUntil()      { testSignalAll(false, AwaitMethod.awaitUntil); }
1105	>	public void testSignalAll_awaitUntil_fair() { testSignalAll(true,  AwaitMethod.awaitUntil); }
1106	>	public void testSignalAll(boolean fair, final AwaitMethod awaitMethod) {
1107	>	final PublicReentrantReadWriteLock lock =
1108	>	new PublicReentrantReadWriteLock(fair);
1109	>	final Condition c = lock.writeLock().newCondition();
1110	>	final CountDownLatch locked = new CountDownLatch(2);
1111	>	final Lock writeLock = lock.writeLock();
1112	>	class Awaiter extends CheckedRunnable {
1113	>	public void realRun() throws InterruptedException {
1114	>	writeLock.lock();
1115	>	locked.countDown();
1116	>	await(c, awaitMethod);
1117	>	writeLock.unlock();
1118	>	}
1119	>	}
1120	>
1121	>	Thread t1 = newStartedThread(new Awaiter());
1122	>	Thread t2 = newStartedThread(new Awaiter());
1123	>
1124	>	await(locked);
1125	>	writeLock.lock();
1126	>	assertHasWaiters(lock, c, t1, t2);
1127	>	c.signalAll();
1128	>	assertHasNoWaiters(lock, c);
1129	>	writeLock.unlock();
1130	>	awaitTermination(t1);
1131	>	awaitTermination(t2);
1132	>	}
1133	>
1134	>	/**
1135	>	* signal wakes up waiting threads in FIFO order
1136	>	*/
1137	>	public void testSignalWakesFifo()      { testSignalWakesFifo(false); }
1138	>	public void testSignalWakesFifo_fair() { testSignalWakesFifo(true); }
1139	>	public void testSignalWakesFifo(boolean fair) {
1140	>	final PublicReentrantReadWriteLock lock =
1141	>	new PublicReentrantReadWriteLock(fair);
1142	>	final Condition c = lock.writeLock().newCondition();
1143	>	final CountDownLatch locked1 = new CountDownLatch(1);
1144	>	final CountDownLatch locked2 = new CountDownLatch(1);
1145	>	final Lock writeLock = lock.writeLock();
1146	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1147	>	public void realRun() throws InterruptedException {
1148	>	writeLock.lock();
1149	>	locked1.countDown();
1150	>	c.await();
1151	>	writeLock.unlock();
1152	>	}});
1153	>
1154	>	await(locked1);
1155	>
1156	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1157	>	public void realRun() throws InterruptedException {
1158	>	writeLock.lock();
1159	>	locked2.countDown();
1160	>	c.await();
1161	>	writeLock.unlock();
1162	>	}});
1163	>
1164	>	await(locked2);
1165	>
1166	>	writeLock.lock();
1167	>	assertHasWaiters(lock, c, t1, t2);
1168	>	assertFalse(lock.hasQueuedThreads());
1169	>	c.signal();
1170	>	assertHasWaiters(lock, c, t2);
1171	>	assertTrue(lock.hasQueuedThread(t1));
1172	>	assertFalse(lock.hasQueuedThread(t2));
1173	>	c.signal();
1174	>	assertHasNoWaiters(lock, c);
1175	>	assertTrue(lock.hasQueuedThread(t1));
1176	>	assertTrue(lock.hasQueuedThread(t2));
1177	>	writeLock.unlock();
1178	>	awaitTermination(t1);
1179	>	awaitTermination(t2);
1180	>	}
1181	>
1182	>	/**
1183	>	* await after multiple reentrant locking preserves lock count
1184	>	*/
1185	>	public void testAwaitLockCount()      { testAwaitLockCount(false); }
1186	>	public void testAwaitLockCount_fair() { testAwaitLockCount(true); }
1187	>	public void testAwaitLockCount(boolean fair) {
1188	>	final PublicReentrantReadWriteLock lock =
1189	>	new PublicReentrantReadWriteLock(fair);
1190	>	final Condition c = lock.writeLock().newCondition();
1191	>	final CountDownLatch locked = new CountDownLatch(2);
1192	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1193	>	public void realRun() throws InterruptedException {
1194	>	lock.writeLock().lock();
1195	>	assertWriteLockedByMoi(lock);
1196	>	assertEquals(1, lock.writeLock().getHoldCount());
1197	>	locked.countDown();
1198	>	c.await();
1199	>	assertWriteLockedByMoi(lock);
1200	>	assertEquals(1, lock.writeLock().getHoldCount());
1201	>	lock.writeLock().unlock();
1202	>	}});
1203	>
1204	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1205	>	public void realRun() throws InterruptedException {
1206	>	lock.writeLock().lock();
1207	>	lock.writeLock().lock();
1208	>	assertWriteLockedByMoi(lock);
1209	>	assertEquals(2, lock.writeLock().getHoldCount());
1210	>	locked.countDown();
1211	>	c.await();
1212	>	assertWriteLockedByMoi(lock);
1213	>	assertEquals(2, lock.writeLock().getHoldCount());
1214	>	lock.writeLock().unlock();
1215	>	lock.writeLock().unlock();
1216	>	}});
1217	>
1218	>	await(locked);
1219	>	lock.writeLock().lock();
1220	>	assertHasWaiters(lock, c, t1, t2);
1221	>	c.signalAll();
1222	>	assertHasNoWaiters(lock, c);
1223	>	lock.writeLock().unlock();
1224	>	awaitTermination(t1);
1225	>	awaitTermination(t2);
1226	>	}
1227	>
1228	>	/**
1229	>	* A serialized lock deserializes as unlocked
1230	>	*/
1231	>	public void testSerialization()      { testSerialization(false); }
1232	>	public void testSerialization_fair() { testSerialization(true); }
1233	>	public void testSerialization(boolean fair) {
1234	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1235	>	lock.writeLock().lock();
1236	>	lock.readLock().lock();
1237	>
1238	>	ReentrantReadWriteLock clone = serialClone(lock);
1239	>	assertEquals(lock.isFair(), clone.isFair());
1240	>	assertTrue(lock.isWriteLocked());
1241	>	assertFalse(clone.isWriteLocked());
1242	>	assertEquals(1, lock.getReadLockCount());
1243	>	assertEquals(0, clone.getReadLockCount());
1244	>	clone.writeLock().lock();
1245	>	clone.readLock().lock();
1246	>	assertTrue(clone.isWriteLocked());
1247	>	assertEquals(1, clone.getReadLockCount());
1248	>	clone.readLock().unlock();
1249	>	clone.writeLock().unlock();
1250	>	assertFalse(clone.isWriteLocked());
1251	>	assertEquals(1, lock.getReadLockCount());
1252	>	assertEquals(0, clone.getReadLockCount());
1253	>	}
1254	>
1255	>	/**
1256	>	* hasQueuedThreads reports whether there are waiting threads
1257	>	*/
1258	>	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
1259	>	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
1260	>	public void testHasQueuedThreads(boolean fair) {
1261	>	final PublicReentrantReadWriteLock lock =
1262	>	new PublicReentrantReadWriteLock(fair);
1263	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1264	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1265	>	assertFalse(lock.hasQueuedThreads());
1266	>	lock.writeLock().lock();
1267	>	assertFalse(lock.hasQueuedThreads());
1268	>	t1.start();
1269	>	waitForQueuedThread(lock, t1);
1270	>	assertTrue(lock.hasQueuedThreads());
1271	>	t2.start();
1272	>	waitForQueuedThread(lock, t2);
1273	>	assertTrue(lock.hasQueuedThreads());
1274	>	t1.interrupt();
1275	>	awaitTermination(t1);
1276	>	assertTrue(lock.hasQueuedThreads());
1277	>	lock.writeLock().unlock();
1278	>	awaitTermination(t2);
1279	>	assertFalse(lock.hasQueuedThreads());
1280	>	}
1281	>
1282	>	/**
1283	>	* hasQueuedThread(null) throws NPE
1284	>	*/
1285	>	public void testHasQueuedThreadNPE()      { testHasQueuedThreadNPE(false); }
1286	>	public void testHasQueuedThreadNPE_fair() { testHasQueuedThreadNPE(true); }
1287	>	public void testHasQueuedThreadNPE(boolean fair) {
1288	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1289	>	try {
1290	>	lock.hasQueuedThread(null);
1291	>	shouldThrow();
1292	>	} catch (NullPointerException success) {}
1293	>	}
1294	>
1295	>	/**
1296	>	* hasQueuedThread reports whether a thread is queued
1297	>	*/
1298	>	public void testHasQueuedThread()      { testHasQueuedThread(false); }
1299	>	public void testHasQueuedThread_fair() { testHasQueuedThread(true); }
1300	>	public void testHasQueuedThread(boolean fair) {
1301	>	final PublicReentrantReadWriteLock lock =
1302	>	new PublicReentrantReadWriteLock(fair);
1303	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1304	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1305	>	assertFalse(lock.hasQueuedThread(t1));
1306	>	assertFalse(lock.hasQueuedThread(t2));
1307	>	lock.writeLock().lock();
1308	>	t1.start();
1309	>	waitForQueuedThread(lock, t1);
1310	>	assertTrue(lock.hasQueuedThread(t1));
1311	>	assertFalse(lock.hasQueuedThread(t2));
1312	>	t2.start();
1313	>	waitForQueuedThread(lock, t2);
1314	>	assertTrue(lock.hasQueuedThread(t1));
1315	>	assertTrue(lock.hasQueuedThread(t2));
1316	>	t1.interrupt();
1317	>	awaitTermination(t1);
1318	>	assertFalse(lock.hasQueuedThread(t1));
1319	>	assertTrue(lock.hasQueuedThread(t2));
1320	>	lock.writeLock().unlock();
1321	>	awaitTermination(t2);
1322	>	assertFalse(lock.hasQueuedThread(t1));
1323	>	assertFalse(lock.hasQueuedThread(t2));
1324	>	}
1325	>
1326	>	/**
1327	>	* getQueueLength reports number of waiting threads
1328	>	*/
1329	>	public void testGetQueueLength()      { testGetQueueLength(false); }
1330	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
1331	>	public void testGetQueueLength(boolean fair) {
1332	>	final PublicReentrantReadWriteLock lock =
1333	>	new PublicReentrantReadWriteLock(fair);
1334	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1335	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1336	>	assertEquals(0, lock.getQueueLength());
1337	>	lock.writeLock().lock();
1338	>	t1.start();
1339	>	waitForQueuedThread(lock, t1);
1340	>	assertEquals(1, lock.getQueueLength());
1341	>	t2.start();
1342	>	waitForQueuedThread(lock, t2);
1343	>	assertEquals(2, lock.getQueueLength());
1344	>	t1.interrupt();
1345	>	awaitTermination(t1);
1346	>	assertEquals(1, lock.getQueueLength());
1347	>	lock.writeLock().unlock();
1348	>	awaitTermination(t2);
1349	>	assertEquals(0, lock.getQueueLength());
1350	>	}
1351	>
1352	>	/**
1353	>	* getQueuedThreads includes waiting threads
1354	>	*/
1355	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
1356	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
1357	>	public void testGetQueuedThreads(boolean fair) {
1358	>	final PublicReentrantReadWriteLock lock =
1359	>	new PublicReentrantReadWriteLock(fair);
1360	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1361	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1362	>	assertTrue(lock.getQueuedThreads().isEmpty());
1363	>	lock.writeLock().lock();
1364	>	assertTrue(lock.getQueuedThreads().isEmpty());
1365	>	t1.start();
1366	>	waitForQueuedThread(lock, t1);
1367	>	assertEquals(1, lock.getQueuedThreads().size());
1368	>	assertTrue(lock.getQueuedThreads().contains(t1));
1369	>	t2.start();
1370	>	waitForQueuedThread(lock, t2);
1371	>	assertEquals(2, lock.getQueuedThreads().size());
1372	>	assertTrue(lock.getQueuedThreads().contains(t1));
1373	>	assertTrue(lock.getQueuedThreads().contains(t2));
1374	>	t1.interrupt();
1375	>	awaitTermination(t1);
1376	>	assertFalse(lock.getQueuedThreads().contains(t1));
1377	>	assertTrue(lock.getQueuedThreads().contains(t2));
1378	>	assertEquals(1, lock.getQueuedThreads().size());
1379	>	lock.writeLock().unlock();
1380	>	awaitTermination(t2);
1381	>	assertTrue(lock.getQueuedThreads().isEmpty());
1382	>	}
1383	>
1384	>	/**
1385	>	* hasWaiters throws NPE if null
1386	>	*/
1387	>	public void testHasWaitersNPE()      { testHasWaitersNPE(false); }
1388	>	public void testHasWaitersNPE_fair() { testHasWaitersNPE(true); }
1389	>	public void testHasWaitersNPE(boolean fair) {
1390	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1391	>	try {
1392	>	lock.hasWaiters(null);
1393	>	shouldThrow();
1394	>	} catch (NullPointerException success) {}
1395	>	}
1396	>
1397	>	/**
1398	>	* getWaitQueueLength throws NPE if null
1399	>	*/
1400	>	public void testGetWaitQueueLengthNPE()      { testGetWaitQueueLengthNPE(false); }
1401	>	public void testGetWaitQueueLengthNPE_fair() { testGetWaitQueueLengthNPE(true); }
1402	>	public void testGetWaitQueueLengthNPE(boolean fair) {
1403	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1404	>	try {
1405	>	lock.getWaitQueueLength(null);
1406	>	shouldThrow();
1407	>	} catch (NullPointerException success) {}
1408	>	}
1409	>
1410	>	/**
1411	>	* getWaitingThreads throws NPE if null
1412	>	*/
1413	>	public void testGetWaitingThreadsNPE()      { testGetWaitingThreadsNPE(false); }
1414	>	public void testGetWaitingThreadsNPE_fair() { testGetWaitingThreadsNPE(true); }
1415	>	public void testGetWaitingThreadsNPE(boolean fair) {
1416	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(fair);
1417	>	try {
1418	>	lock.getWaitingThreads(null);
1419	>	shouldThrow();
1420	>	} catch (NullPointerException success) {}
1421	>	}
1422	>
1423	>	/**
1424	>	* hasWaiters throws IllegalArgumentException if not owned
1425	>	*/
1426	>	public void testHasWaitersIAE()      { testHasWaitersIAE(false); }
1427	>	public void testHasWaitersIAE_fair() { testHasWaitersIAE(true); }
1428	>	public void testHasWaitersIAE(boolean fair) {
1429	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1430	>	final Condition c = lock.writeLock().newCondition();
1431	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(fair);
1432	>	try {
1433	>	lock2.hasWaiters(c);
1434	>	shouldThrow();
1435	>	} catch (IllegalArgumentException success) {}
1436	>	}
1437	>
1438	>	/**
1439	>	* hasWaiters throws IllegalMonitorStateException if not locked
1440	>	*/
1441	>	public void testHasWaitersIMSE()      { testHasWaitersIMSE(false); }
1442	>	public void testHasWaitersIMSE_fair() { testHasWaitersIMSE(true); }
1443	>	public void testHasWaitersIMSE(boolean fair) {
1444	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1445	>	final Condition c = lock.writeLock().newCondition();
1446	>	try {
1447	>	lock.hasWaiters(c);
1448	>	shouldThrow();
1449	>	} catch (IllegalMonitorStateException success) {}
1450		}
1451
1452	+	/**
1453	+	* getWaitQueueLength throws IllegalArgumentException if not owned
1454	+	*/
1455	+	public void testGetWaitQueueLengthIAE()      { testGetWaitQueueLengthIAE(false); }
1456	+	public void testGetWaitQueueLengthIAE_fair() { testGetWaitQueueLengthIAE(true); }
1457	+	public void testGetWaitQueueLengthIAE(boolean fair) {
1458	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1459	+	final Condition c = lock.writeLock().newCondition();
1460	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(fair);
1461	+	try {
1462	+	lock2.getWaitQueueLength(c);
1463	+	shouldThrow();
1464	+	} catch (IllegalArgumentException success) {}
1465	+	}
1466	+
1467	+	/**
1468	+	* getWaitQueueLength throws IllegalMonitorStateException if not locked
1469	+	*/
1470	+	public void testGetWaitQueueLengthIMSE()      { testGetWaitQueueLengthIMSE(false); }
1471	+	public void testGetWaitQueueLengthIMSE_fair() { testGetWaitQueueLengthIMSE(true); }
1472	+	public void testGetWaitQueueLengthIMSE(boolean fair) {
1473	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1474	+	final Condition c = lock.writeLock().newCondition();
1475	+	try {
1476	+	lock.getWaitQueueLength(c);
1477	+	shouldThrow();
1478	+	} catch (IllegalMonitorStateException success) {}
1479	+	}
1480	+
1481	+	/**
1482	+	* getWaitingThreads throws IllegalArgumentException if not owned
1483	+	*/
1484	+	public void testGetWaitingThreadsIAE()      { testGetWaitingThreadsIAE(false); }
1485	+	public void testGetWaitingThreadsIAE_fair() { testGetWaitingThreadsIAE(true); }
1486	+	public void testGetWaitingThreadsIAE(boolean fair) {
1487	+	final PublicReentrantReadWriteLock lock =
1488	+	new PublicReentrantReadWriteLock(fair);
1489	+	final Condition c = lock.writeLock().newCondition();
1490	+	final PublicReentrantReadWriteLock lock2 =
1491	+	new PublicReentrantReadWriteLock(fair);
1492	+	try {
1493	+	lock2.getWaitingThreads(c);
1494	+	shouldThrow();
1495	+	} catch (IllegalArgumentException success) {}
1496	+	}
1497	+
1498	+	/**
1499	+	* getWaitingThreads throws IllegalMonitorStateException if not locked
1500	+	*/
1501	+	public void testGetWaitingThreadsIMSE()      { testGetWaitingThreadsIMSE(false); }
1502	+	public void testGetWaitingThreadsIMSE_fair() { testGetWaitingThreadsIMSE(true); }
1503	+	public void testGetWaitingThreadsIMSE(boolean fair) {
1504	+	final PublicReentrantReadWriteLock lock =
1505	+	new PublicReentrantReadWriteLock(fair);
1506	+	final Condition c = lock.writeLock().newCondition();
1507	+	try {
1508	+	lock.getWaitingThreads(c);
1509	+	shouldThrow();
1510	+	} catch (IllegalMonitorStateException success) {}
1511	+	}
1512
1513	<	private static long SHORT_DELAY_MS = 100;
1514	<	private static long MEDIUM_DELAY_MS = 1000;
1515	<	private static long LONG_DELAY_MS = 10000;
1516	<
1517	<	/*
1518	<	* Unlocks an unlocked lock, throws Illegal Monitor State
1519	<	*
1520	<	*/
1521	<
1522	<	public void testIllegalMonitorStateException(){
1523	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
1524	<	try{
1525	<	rl.writeLock().unlock();
1526	<	fail("Should of thown Illegal Monitor State Exception");
1527	<
1528	<	}catch(IllegalMonitorStateException sucess){}
1529	<
1530	<
1531	<	}
1532	<
1533	<	/*
1534	<	* makes a lock, locks it, tries to aquire the lock in another thread
1535	<	* interrupts that thread and waits for an interrupted Exception to
1536	<	* be thrown.
1537	<	*/
1538	<
1539	<	public void testInterruptedException(){
1540	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1541	<	lock.writeLock().lock();
1542	<	Thread t = new Thread(new Runnable() {
1543	<	public void run(){
1544	<	try{
1545	<	lock.writeLock().lockInterruptibly();
1546	<	fail("should throw");
1547	<	}catch(InterruptedException sucess){}
1548	<	}
1549	<	});
1550	<	t.start();
1551	<	t.interrupt();
1552	<	lock.writeLock().unlock();
1553	<	}
1554	<
1555	<	/*
1556	<	* tests for interrupted exception on a timed wait
1557	<	*
1558	<	*/
1559	<
1560	<
1561	<	public void testInterruptedException2(){
1562	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1563	<	lock.writeLock().lock();
1564	<	Thread t = new Thread(new Runnable() {
1565	<	public void run(){
1566	<	try{
1567	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
1568	<	fail("should throw");
1569	<	}catch(InterruptedException sucess){}
1570	<	}
1571	<	});
1572	<	t.start();
1573	<	t.interrupt();
1574	<	}
1575	<
1576	<
1577	<
1578	<	/*
1579	<	* current thread locks interruptibly the thread
1580	<	* another thread tries to aquire the lock and blocks
1581	<	* on the call. interrupt the attempted aquireLock
1582	<	* assert that the first lock() call actually locked the lock
1583	<	* assert that the current thread is the one holding the lock
1584	<	*/
1585	<
1586	<	public void testLockedInterruptibly() {
1587	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1588	<	try {lock.writeLock().lockInterruptibly();} catch(Exception e) {}
1589	<	Thread t = new Thread(new Runnable() {
1590	<	public void run() {
1591	<	try {
1592	<	lock.writeLock().lockInterruptibly();
1593	<	fail("Failed to generate an Interrupted Exception");
1594	<	}
1595	<	catch(InterruptedException e) {}
1596	<	}
1597	<	});
1598	<	t.start();
1599	<	t.interrupt();
1513	>	/**
1514	>	* hasWaiters returns true when a thread is waiting, else false
1515	>	*/
1516	>	public void testHasWaiters()      { testHasWaiters(false); }
1517	>	public void testHasWaiters_fair() { testHasWaiters(true); }
1518	>	public void testHasWaiters(boolean fair) {
1519	>	final PublicReentrantReadWriteLock lock =
1520	>	new PublicReentrantReadWriteLock(fair);
1521	>	final Condition c = lock.writeLock().newCondition();
1522	>	final CountDownLatch locked = new CountDownLatch(1);
1523	>	Thread t = newStartedThread(new CheckedRunnable() {
1524	>	public void realRun() throws InterruptedException {
1525	>	lock.writeLock().lock();
1526	>	assertHasNoWaiters(lock, c);
1527	>	assertFalse(lock.hasWaiters(c));
1528	>	locked.countDown();
1529	>	c.await();
1530	>	assertHasNoWaiters(lock, c);
1531	>	assertFalse(lock.hasWaiters(c));
1532	>	lock.writeLock().unlock();
1533	>	}});
1534	>
1535	>	await(locked);
1536	>	lock.writeLock().lock();
1537	>	assertHasWaiters(lock, c, t);
1538	>	assertTrue(lock.hasWaiters(c));
1539	>	c.signal();
1540	>	assertHasNoWaiters(lock, c);
1541	>	assertFalse(lock.hasWaiters(c));
1542	>	lock.writeLock().unlock();
1543	>	awaitTermination(t);
1544	>	assertHasNoWaiters(lock, c);
1545	>	}
1546	>
1547	>	/**
1548	>	* getWaitQueueLength returns number of waiting threads
1549	>	*/
1550	>	public void testGetWaitQueueLength()      { testGetWaitQueueLength(false); }
1551	>	public void testGetWaitQueueLength_fair() { testGetWaitQueueLength(true); }
1552	>	public void testGetWaitQueueLength(boolean fair) {
1553	>	final PublicReentrantReadWriteLock lock =
1554	>	new PublicReentrantReadWriteLock(fair);
1555	>	final Condition c = lock.writeLock().newCondition();
1556	>	final CountDownLatch locked = new CountDownLatch(1);
1557	>	Thread t = newStartedThread(new CheckedRunnable() {
1558	>	public void realRun() throws InterruptedException {
1559	>	lock.writeLock().lock();
1560	>	assertEquals(0, lock.getWaitQueueLength(c));
1561	>	locked.countDown();
1562	>	c.await();
1563	>	lock.writeLock().unlock();
1564	>	}});
1565	>
1566	>	await(locked);
1567	>	lock.writeLock().lock();
1568	>	assertHasWaiters(lock, c, t);
1569	>	assertEquals(1, lock.getWaitQueueLength(c));
1570	>	c.signal();
1571	>	assertHasNoWaiters(lock, c);
1572	>	assertEquals(0, lock.getWaitQueueLength(c));
1573	>	lock.writeLock().unlock();
1574	>	awaitTermination(t);
1575	>	}
1576	>
1577	>	/**
1578	>	* getWaitingThreads returns only and all waiting threads
1579	>	*/
1580	>	public void testGetWaitingThreads()      { testGetWaitingThreads(false); }
1581	>	public void testGetWaitingThreads_fair() { testGetWaitingThreads(true); }
1582	>	public void testGetWaitingThreads(boolean fair) {
1583	>	final PublicReentrantReadWriteLock lock =
1584	>	new PublicReentrantReadWriteLock(fair);
1585	>	final Condition c = lock.writeLock().newCondition();
1586	>	final CountDownLatch locked1 = new CountDownLatch(1);
1587	>	final CountDownLatch locked2 = new CountDownLatch(1);
1588	>	Thread t1 = new Thread(new CheckedRunnable() {
1589	>	public void realRun() throws InterruptedException {
1590	>	lock.writeLock().lock();
1591	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1592	>	locked1.countDown();
1593	>	c.await();
1594	>	lock.writeLock().unlock();
1595	>	}});
1596	>
1597	>	Thread t2 = new Thread(new CheckedRunnable() {
1598	>	public void realRun() throws InterruptedException {
1599	>	lock.writeLock().lock();
1600	>	assertFalse(lock.getWaitingThreads(c).isEmpty());
1601	>	locked2.countDown();
1602	>	c.await();
1603	>	lock.writeLock().unlock();
1604	>	}});
1605	>
1606	>	lock.writeLock().lock();
1607	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1608	>	lock.writeLock().unlock();
1609	>
1610	>	t1.start();
1611	>	await(locked1);
1612	>	t2.start();
1613	>	await(locked2);
1614	>
1615	>	lock.writeLock().lock();
1616	>	assertTrue(lock.hasWaiters(c));
1617	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
1618	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
1619	>	assertEquals(2, lock.getWaitingThreads(c).size());
1620	>	c.signalAll();
1621	>	assertHasNoWaiters(lock, c);
1622	>	lock.writeLock().unlock();
1623	>
1624	>	awaitTermination(t1);
1625	>	awaitTermination(t2);
1626	>
1627	>	assertHasNoWaiters(lock, c);
1628	>	}
1629	>
1630	>	/**
1631	>	* toString indicates current lock state
1632	>	*/
1633	>	public void testToString()      { testToString(false); }
1634	>	public void testToString_fair() { testToString(true); }
1635	>	public void testToString(boolean fair) {
1636	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1637	>	assertTrue(lock.toString().contains("Write locks = 0"));
1638	>	assertTrue(lock.toString().contains("Read locks = 0"));
1639	>	lock.writeLock().lock();
1640	>	assertTrue(lock.toString().contains("Write locks = 1"));
1641	>	assertTrue(lock.toString().contains("Read locks = 0"));
1642	>	lock.writeLock().unlock();
1643	>	lock.readLock().lock();
1644	>	lock.readLock().lock();
1645	>	assertTrue(lock.toString().contains("Write locks = 0"));
1646	>	assertTrue(lock.toString().contains("Read locks = 2"));
1647	>	}
1648	>
1649	>	/**
1650	>	* readLock.toString indicates current lock state
1651	>	*/
1652	>	public void testReadLockToString()      { testReadLockToString(false); }
1653	>	public void testReadLockToString_fair() { testReadLockToString(true); }
1654	>	public void testReadLockToString(boolean fair) {
1655	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1656	>	assertTrue(lock.readLock().toString().contains("Read locks = 0"));
1657	>	lock.readLock().lock();
1658	>	lock.readLock().lock();
1659	>	assertTrue(lock.readLock().toString().contains("Read locks = 2"));
1660	>	}
1661	>
1662	>	/**
1663	>	* writeLock.toString indicates current lock state
1664	>	*/
1665	>	public void testWriteLockToString()      { testWriteLockToString(false); }
1666	>	public void testWriteLockToString_fair() { testWriteLockToString(true); }
1667	>	public void testWriteLockToString(boolean fair) {
1668	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1669	>	assertTrue(lock.writeLock().toString().contains("Unlocked"));
1670	>	lock.writeLock().lock();
1671	>	assertTrue(lock.writeLock().toString().contains("Locked"));
1672	>	lock.writeLock().unlock();
1673	>	assertTrue(lock.writeLock().toString().contains("Unlocked"));
1674		}
112	–
1675
1676		}

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