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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 1.83 by jsr166, Sun Sep 22 01:59:57 2019 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.Callable;
15	>	import java.util.concurrent.CountDownLatch;
16	>	import java.util.concurrent.atomic.AtomicBoolean;
17	>	import java.util.concurrent.locks.Condition;
18	>	import java.util.concurrent.locks.Lock;
19	>	import java.util.concurrent.locks.ReentrantReadWriteLock;
20	>
21	>	import junit.framework.Test;
22	>	import junit.framework.TestSuite;
23	>
24	>	@SuppressWarnings("WaitNotInLoop") // we implement spurious-wakeup freedom
25	>	public class ReentrantReadWriteLockTest extends JSR166TestCase {
26		public static void main(String[] args) {
27	<	junit.textui.TestRunner.run (suite());
27	>	main(suite(), args);
28		}
18	–
29		public static Test suite() {
30	<	return new TestSuite(ReentrantReadWriteLockTest.class);
30	>	return new TestSuite(ReentrantReadWriteLockTest.class);
31	>	}
32	>
33	>	/**
34	>	* A runnable calling lockInterruptibly
35	>	*/
36	>	class InterruptibleLockRunnable extends CheckedRunnable {
37	>	final ReentrantReadWriteLock lock;
38	>	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
39	>	public void realRun() throws InterruptedException {
40	>	lock.writeLock().lockInterruptibly();
41	>	}
42	>	}
43	>
44	>	/**
45	>	* A runnable calling lockInterruptibly that expects to be
46	>	* interrupted
47	>	*/
48	>	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
49	>	final ReentrantReadWriteLock lock;
50	>	InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
51	>	public void realRun() throws InterruptedException {
52	>	lock.writeLock().lockInterruptibly();
53	>	}
54	>	}
55	>
56	>	/**
57	>	* Subclass to expose protected methods
58	>	*/
59	>	static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
60	>	PublicReentrantReadWriteLock() { super(); }
61	>	PublicReentrantReadWriteLock(boolean fair) { super(fair); }
62	>	public Thread getOwner() {
63	>	return super.getOwner();
64	>	}
65	>	public Collection<Thread> getQueuedThreads() {
66	>	return super.getQueuedThreads();
67	>	}
68	>	public Collection<Thread> getWaitingThreads(Condition c) {
69	>	return super.getWaitingThreads(c);
70	>	}
71	>	}
72	>
73	>	/**
74	>	* Releases write lock, checking that it had a hold count of 1.
75	>	*/
76	>	void releaseWriteLock(PublicReentrantReadWriteLock lock) {
77	>	ReentrantReadWriteLock.WriteLock writeLock = lock.writeLock();
78	>	assertWriteLockedByMoi(lock);
79	>	assertEquals(1, lock.getWriteHoldCount());
80	>	writeLock.unlock();
81	>	assertNotWriteLocked(lock);
82	>	}
83	>
84	>	/**
85	>	* Spin-waits until lock.hasQueuedThread(t) becomes true.
86	>	*/
87	>	void waitForQueuedThread(PublicReentrantReadWriteLock lock, Thread t) {
88	>	long startTime = System.nanoTime();
89	>	while (!lock.hasQueuedThread(t)) {
90	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
91	>	throw new AssertionError("timed out");
92	>	Thread.yield();
93	>	}
94	>	assertTrue(t.isAlive());
95	>	assertNotSame(t, lock.getOwner());
96	>	}
97	>
98	>	/**
99	>	* Checks that lock is not write-locked.
100	>	*/
101	>	void assertNotWriteLocked(PublicReentrantReadWriteLock lock) {
102	>	assertFalse(lock.isWriteLocked());
103	>	assertFalse(lock.isWriteLockedByCurrentThread());
104	>	assertFalse(lock.writeLock().isHeldByCurrentThread());
105	>	assertEquals(0, lock.getWriteHoldCount());
106	>	assertEquals(0, lock.writeLock().getHoldCount());
107	>	assertNull(lock.getOwner());
108	>	}
109	>
110	>	/**
111	>	* Checks that lock is write-locked by the given thread.
112	>	*/
113	>	void assertWriteLockedBy(PublicReentrantReadWriteLock lock, Thread t) {
114	>	assertTrue(lock.isWriteLocked());
115	>	assertSame(t, lock.getOwner());
116	>	assertEquals(t == Thread.currentThread(),
117	>	lock.isWriteLockedByCurrentThread());
118	>	assertEquals(t == Thread.currentThread(),
119	>	lock.writeLock().isHeldByCurrentThread());
120	>	assertEquals(t == Thread.currentThread(),
121	>	lock.getWriteHoldCount() > 0);
122	>	assertEquals(t == Thread.currentThread(),
123	>	lock.writeLock().getHoldCount() > 0);
124	>	assertEquals(0, lock.getReadLockCount());
125	>	}
126	>
127	>	/**
128	>	* Checks that lock is write-locked by the current thread.
129	>	*/
130	>	void assertWriteLockedByMoi(PublicReentrantReadWriteLock lock) {
131	>	assertWriteLockedBy(lock, Thread.currentThread());
132	>	}
133	>
134	>	/**
135	>	* Checks that condition c has no waiters.
136	>	*/
137	>	void assertHasNoWaiters(PublicReentrantReadWriteLock lock, Condition c) {
138	>	assertHasWaiters(lock, c, new Thread[] {});
139	>	}
140	>
141	>	/**
142	>	* Checks that condition c has exactly the given waiter threads.
143	>	*/
144	>	void assertHasWaiters(PublicReentrantReadWriteLock lock, Condition c,
145	>	Thread... threads) {
146	>	lock.writeLock().lock();
147	>	assertEquals(threads.length > 0, lock.hasWaiters(c));
148	>	assertEquals(threads.length, lock.getWaitQueueLength(c));
149	>	assertEquals(threads.length == 0, lock.getWaitingThreads(c).isEmpty());
150	>	assertEquals(threads.length, lock.getWaitingThreads(c).size());
151	>	assertEquals(new HashSet<Thread>(lock.getWaitingThreads(c)),
152	>	new HashSet<Thread>(Arrays.asList(threads)));
153	>	lock.writeLock().unlock();
154	>	}
155	>
156	>	enum AwaitMethod { await, awaitTimed, awaitNanos, awaitUntil }
157	>
158	>	/**
159	>	* Awaits condition "indefinitely" using the specified AwaitMethod.
160	>	*/
161	>	void await(Condition c, AwaitMethod awaitMethod)
162	>	throws InterruptedException {
163	>	long timeoutMillis = 2 * LONG_DELAY_MS;
164	>	switch (awaitMethod) {
165	>	case await:
166	>	c.await();
167	>	break;
168	>	case awaitTimed:
169	>	assertTrue(c.await(timeoutMillis, MILLISECONDS));
170	>	break;
171	>	case awaitNanos:
172	>	long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis);
173	>	long nanosRemaining = c.awaitNanos(timeoutNanos);
174	>	assertTrue(nanosRemaining > timeoutNanos / 2);
175	>	assertTrue(nanosRemaining <= timeoutNanos);
176	>	break;
177	>	case awaitUntil:
178	>	assertTrue(c.awaitUntil(delayedDate(timeoutMillis)));
179	>	break;
180	>	default:
181	>	throw new AssertionError();
182	>	}
183	>	}
184	>
185	>	/**
186	>	* Constructor sets given fairness, and is in unlocked state
187	>	*/
188	>	public void testConstructor() {
189	>	PublicReentrantReadWriteLock lock;
190	>
191	>	lock = new PublicReentrantReadWriteLock();
192	>	assertFalse(lock.isFair());
193	>	assertNotWriteLocked(lock);
194	>	assertEquals(0, lock.getReadLockCount());
195	>
196	>	lock = new PublicReentrantReadWriteLock(true);
197	>	assertTrue(lock.isFair());
198	>	assertNotWriteLocked(lock);
199	>	assertEquals(0, lock.getReadLockCount());
200	>
201	>	lock = new PublicReentrantReadWriteLock(false);
202	>	assertFalse(lock.isFair());
203	>	assertNotWriteLocked(lock);
204	>	assertEquals(0, lock.getReadLockCount());
205	>	}
206	>
207	>	/**
208	>	* write-locking and read-locking an unlocked lock succeed
209	>	*/
210	>	public void testLock()      { testLock(false); }
211	>	public void testLock_fair() { testLock(true); }
212	>	public void testLock(boolean fair) {
213	>	PublicReentrantReadWriteLock lock =
214	>	new PublicReentrantReadWriteLock(fair);
215	>	assertNotWriteLocked(lock);
216	>	lock.writeLock().lock();
217	>	assertWriteLockedByMoi(lock);
218	>	lock.writeLock().unlock();
219	>	assertNotWriteLocked(lock);
220	>	assertEquals(0, lock.getReadLockCount());
221	>	lock.readLock().lock();
222	>	assertNotWriteLocked(lock);
223	>	assertEquals(1, lock.getReadLockCount());
224	>	lock.readLock().unlock();
225	>	assertNotWriteLocked(lock);
226	>	assertEquals(0, lock.getReadLockCount());
227	>	}
228	>
229	>	/**
230	>	* getWriteHoldCount returns number of recursive holds
231	>	*/
232	>	public void testGetWriteHoldCount()      { testGetWriteHoldCount(false); }
233	>	public void testGetWriteHoldCount_fair() { testGetWriteHoldCount(true); }
234	>	public void testGetWriteHoldCount(boolean fair) {
235	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
236	>	for (int i = 1; i <= SIZE; i++) {
237	>	lock.writeLock().lock();
238	>	assertEquals(i,lock.getWriteHoldCount());
239	>	}
240	>	for (int i = SIZE; i > 0; i--) {
241	>	lock.writeLock().unlock();
242	>	assertEquals(i - 1,lock.getWriteHoldCount());
243	>	}
244	>	}
245	>
246	>	/**
247	>	* writelock.getHoldCount returns number of recursive holds
248	>	*/
249	>	public void testGetHoldCount()      { testGetHoldCount(false); }
250	>	public void testGetHoldCount_fair() { testGetHoldCount(true); }
251	>	public void testGetHoldCount(boolean fair) {
252	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
253	>	for (int i = 1; i <= SIZE; i++) {
254	>	lock.writeLock().lock();
255	>	assertEquals(i,lock.writeLock().getHoldCount());
256	>	}
257	>	for (int i = SIZE; i > 0; i--) {
258	>	lock.writeLock().unlock();
259	>	assertEquals(i - 1,lock.writeLock().getHoldCount());
260	>	}
261	>	}
262	>
263	>	/**
264	>	* getReadHoldCount returns number of recursive holds
265	>	*/
266	>	public void testGetReadHoldCount()      { testGetReadHoldCount(false); }
267	>	public void testGetReadHoldCount_fair() { testGetReadHoldCount(true); }
268	>	public void testGetReadHoldCount(boolean fair) {
269	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
270	>	for (int i = 1; i <= SIZE; i++) {
271	>	lock.readLock().lock();
272	>	assertEquals(i,lock.getReadHoldCount());
273	>	}
274	>	for (int i = SIZE; i > 0; i--) {
275	>	lock.readLock().unlock();
276	>	assertEquals(i - 1,lock.getReadHoldCount());
277	>	}
278	>	}
279	>
280	>	/**
281	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
282	>	*/
283	>	public void testWriteUnlock_IMSE()      { testWriteUnlock_IMSE(false); }
284	>	public void testWriteUnlock_IMSE_fair() { testWriteUnlock_IMSE(true); }
285	>	public void testWriteUnlock_IMSE(boolean fair) {
286	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
287	>	try {
288	>	lock.writeLock().unlock();
289	>	shouldThrow();
290	>	} catch (IllegalMonitorStateException success) {}
291	>	}
292	>
293	>	/**
294	>	* read-unlocking an unlocked lock throws IllegalMonitorStateException
295	>	*/
296	>	public void testReadUnlock_IMSE()      { testReadUnlock_IMSE(false); }
297	>	public void testReadUnlock_IMSE_fair() { testReadUnlock_IMSE(true); }
298	>	public void testReadUnlock_IMSE(boolean fair) {
299	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
300	>	try {
301	>	lock.readLock().unlock();
302	>	shouldThrow();
303	>	} catch (IllegalMonitorStateException success) {}
304	>	}
305	>
306	>	/**
307	>	* write-lockInterruptibly is interruptible
308	>	*/
309	>	public void testWriteLockInterruptibly_Interruptible()      { testWriteLockInterruptibly_Interruptible(false); }
310	>	public void testWriteLockInterruptibly_Interruptible_fair() { testWriteLockInterruptibly_Interruptible(true); }
311	>	public void testWriteLockInterruptibly_Interruptible(boolean fair) {
312	>	final PublicReentrantReadWriteLock lock =
313	>	new PublicReentrantReadWriteLock(fair);
314	>	lock.writeLock().lock();
315	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
316	>	public void realRun() throws InterruptedException {
317	>	lock.writeLock().lockInterruptibly();
318	>	}});
319	>
320	>	waitForQueuedThread(lock, t);
321	>	t.interrupt();
322	>	awaitTermination(t);
323	>	releaseWriteLock(lock);
324	>	}
325	>
326	>	/**
327	>	* timed write-tryLock is interruptible
328	>	*/
329	>	public void testWriteTryLock_Interruptible()      { testWriteTryLock_Interruptible(false); }
330	>	public void testWriteTryLock_Interruptible_fair() { testWriteTryLock_Interruptible(true); }
331	>	public void testWriteTryLock_Interruptible(boolean fair) {
332	>	final PublicReentrantReadWriteLock lock =
333	>	new PublicReentrantReadWriteLock(fair);
334	>	lock.writeLock().lock();
335	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
336	>	public void realRun() throws InterruptedException {
337	>	lock.writeLock().tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
338	>	}});
339	>
340	>	waitForQueuedThread(lock, t);
341	>	t.interrupt();
342	>	awaitTermination(t);
343	>	releaseWriteLock(lock);
344	>	}
345	>
346	>	/**
347	>	* read-lockInterruptibly is interruptible
348	>	*/
349	>	public void testReadLockInterruptibly_Interruptible()      { testReadLockInterruptibly_Interruptible(false); }
350	>	public void testReadLockInterruptibly_Interruptible_fair() { testReadLockInterruptibly_Interruptible(true); }
351	>	public void testReadLockInterruptibly_Interruptible(boolean fair) {
352	>	final PublicReentrantReadWriteLock lock =
353	>	new PublicReentrantReadWriteLock(fair);
354	>	lock.writeLock().lock();
355	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
356	>	public void realRun() throws InterruptedException {
357	>	lock.readLock().lockInterruptibly();
358	>	}});
359	>
360	>	waitForQueuedThread(lock, t);
361	>	t.interrupt();
362	>	awaitTermination(t);
363	>	releaseWriteLock(lock);
364	>	}
365	>
366	>	/**
367	>	* timed read-tryLock is interruptible
368	>	*/
369	>	public void testReadTryLock_Interruptible()      { testReadTryLock_Interruptible(false); }
370	>	public void testReadTryLock_Interruptible_fair() { testReadTryLock_Interruptible(true); }
371	>	public void testReadTryLock_Interruptible(boolean fair) {
372	>	final PublicReentrantReadWriteLock lock =
373	>	new PublicReentrantReadWriteLock(fair);
374	>	lock.writeLock().lock();
375	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
376	>	public void realRun() throws InterruptedException {
377	>	lock.readLock().tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
378	>	}});
379	>
380	>	waitForQueuedThread(lock, t);
381	>	t.interrupt();
382	>	awaitTermination(t);
383	>	releaseWriteLock(lock);
384	>	}
385	>
386	>	/**
387	>	* write-tryLock on an unlocked lock succeeds
388	>	*/
389	>	public void testWriteTryLock()      { testWriteTryLock(false); }
390	>	public void testWriteTryLock_fair() { testWriteTryLock(true); }
391	>	public void testWriteTryLock(boolean fair) {
392	>	final PublicReentrantReadWriteLock lock =
393	>	new PublicReentrantReadWriteLock(fair);
394	>	assertTrue(lock.writeLock().tryLock());
395	>	assertWriteLockedByMoi(lock);
396	>	assertTrue(lock.writeLock().tryLock());
397	>	assertWriteLockedByMoi(lock);
398	>	lock.writeLock().unlock();
399	>	releaseWriteLock(lock);
400	>	}
401	>
402	>	/**
403	>	* write-tryLock fails if locked
404	>	*/
405	>	public void testWriteTryLockWhenLocked()      { testWriteTryLockWhenLocked(false); }
406	>	public void testWriteTryLockWhenLocked_fair() { testWriteTryLockWhenLocked(true); }
407	>	public void testWriteTryLockWhenLocked(boolean fair) {
408	>	final PublicReentrantReadWriteLock lock =
409	>	new PublicReentrantReadWriteLock(fair);
410	>	lock.writeLock().lock();
411	>	Thread t = newStartedThread(new CheckedRunnable() {
412	>	public void realRun() {
413	>	assertFalse(lock.writeLock().tryLock());
414	>	}});
415	>
416	>	awaitTermination(t);
417	>	releaseWriteLock(lock);
418	>	}
419	>
420	>	/**
421	>	* read-tryLock fails if locked
422	>	*/
423	>	public void testReadTryLockWhenLocked()      { testReadTryLockWhenLocked(false); }
424	>	public void testReadTryLockWhenLocked_fair() { testReadTryLockWhenLocked(true); }
425	>	public void testReadTryLockWhenLocked(boolean fair) {
426	>	final PublicReentrantReadWriteLock lock =
427	>	new PublicReentrantReadWriteLock(fair);
428	>	lock.writeLock().lock();
429	>	Thread t = newStartedThread(new CheckedRunnable() {
430	>	public void realRun() {
431	>	assertFalse(lock.readLock().tryLock());
432	>	}});
433	>
434	>	awaitTermination(t);
435	>	releaseWriteLock(lock);
436	>	}
437	>
438	>	/**
439	>	* Multiple threads can hold a read lock when not write-locked
440	>	*/
441	>	public void testMultipleReadLocks()      { testMultipleReadLocks(false); }
442	>	public void testMultipleReadLocks_fair() { testMultipleReadLocks(true); }
443	>	public void testMultipleReadLocks(boolean fair) {
444	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
445	>	lock.readLock().lock();
446	>	Thread t = newStartedThread(new CheckedRunnable() {
447	>	public void realRun() throws InterruptedException {
448	>	assertTrue(lock.readLock().tryLock());
449	>	lock.readLock().unlock();
450	>	assertTrue(lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS));
451	>	lock.readLock().unlock();
452	>	lock.readLock().lock();
453	>	lock.readLock().unlock();
454	>	}});
455	>
456	>	awaitTermination(t);
457	>	lock.readLock().unlock();
458	>	}
459	>
460	>	/**
461	>	* A writelock succeeds only after a reading thread unlocks
462	>	*/
463	>	public void testWriteAfterReadLock()      { testWriteAfterReadLock(false); }
464	>	public void testWriteAfterReadLock_fair() { testWriteAfterReadLock(true); }
465	>	public void testWriteAfterReadLock(boolean fair) {
466	>	final PublicReentrantReadWriteLock lock =
467	>	new PublicReentrantReadWriteLock(fair);
468	>	lock.readLock().lock();
469	>	Thread t = newStartedThread(new CheckedRunnable() {
470	>	public void realRun() {
471	>	assertEquals(1, lock.getReadLockCount());
472	>	lock.writeLock().lock();
473	>	assertEquals(0, lock.getReadLockCount());
474	>	lock.writeLock().unlock();
475	>	}});
476	>	waitForQueuedThread(lock, t);
477	>	assertNotWriteLocked(lock);
478	>	assertEquals(1, lock.getReadLockCount());
479	>	lock.readLock().unlock();
480	>	assertEquals(0, lock.getReadLockCount());
481	>	awaitTermination(t);
482	>	assertNotWriteLocked(lock);
483	>	}
484	>
485	>	/**
486	>	* A writelock succeeds only after reading threads unlock
487	>	*/
488	>	public void testWriteAfterMultipleReadLocks()      { testWriteAfterMultipleReadLocks(false); }
489	>	public void testWriteAfterMultipleReadLocks_fair() { testWriteAfterMultipleReadLocks(true); }
490	>	public void testWriteAfterMultipleReadLocks(boolean fair) {
491	>	final PublicReentrantReadWriteLock lock =
492	>	new PublicReentrantReadWriteLock(fair);
493	>	lock.readLock().lock();
494	>	lock.readLock().lock();
495	>	Thread t1 = newStartedThread(new CheckedRunnable() {
496	>	public void realRun() {
497	>	lock.readLock().lock();
498	>	assertEquals(3, lock.getReadLockCount());
499	>	lock.readLock().unlock();
500	>	}});
501	>	awaitTermination(t1);
502	>
503	>	Thread t2 = newStartedThread(new CheckedRunnable() {
504	>	public void realRun() {
505	>	assertEquals(2, lock.getReadLockCount());
506	>	lock.writeLock().lock();
507	>	assertEquals(0, lock.getReadLockCount());
508	>	lock.writeLock().unlock();
509	>	}});
510	>	waitForQueuedThread(lock, t2);
511	>	assertNotWriteLocked(lock);
512	>	assertEquals(2, lock.getReadLockCount());
513	>	lock.readLock().unlock();
514	>	lock.readLock().unlock();
515	>	assertEquals(0, lock.getReadLockCount());
516	>	awaitTermination(t2);
517	>	assertNotWriteLocked(lock);
518	>	}
519	>
520	>	/**
521	>	* A thread that tries to acquire a fair read lock (non-reentrantly)
522	>	* will block if there is a waiting writer thread
523	>	*/
524	>	public void testReaderWriterReaderFairFifo() {
525	>	final PublicReentrantReadWriteLock lock =
526	>	new PublicReentrantReadWriteLock(true);
527	>	final AtomicBoolean t1GotLock = new AtomicBoolean(false);
528	>
529	>	lock.readLock().lock();
530	>	Thread t1 = newStartedThread(new CheckedRunnable() {
531	>	public void realRun() {
532	>	assertEquals(1, lock.getReadLockCount());
533	>	lock.writeLock().lock();
534	>	assertEquals(0, lock.getReadLockCount());
535	>	t1GotLock.set(true);
536	>	lock.writeLock().unlock();
537	>	}});
538	>	waitForQueuedThread(lock, t1);
539	>
540	>	Thread t2 = newStartedThread(new CheckedRunnable() {
541	>	public void realRun() {
542	>	assertEquals(1, lock.getReadLockCount());
543	>	lock.readLock().lock();
544	>	assertEquals(1, lock.getReadLockCount());
545	>	assertTrue(t1GotLock.get());
546	>	lock.readLock().unlock();
547	>	}});
548	>	waitForQueuedThread(lock, t2);
549	>	assertTrue(t1.isAlive());
550	>	assertNotWriteLocked(lock);
551	>	assertEquals(1, lock.getReadLockCount());
552	>	lock.readLock().unlock();
553	>	awaitTermination(t1);
554	>	awaitTermination(t2);
555	>	assertNotWriteLocked(lock);
556	>	}
557	>
558	>	/**
559	>	* Readlocks succeed only after a writing thread unlocks
560	>	*/
561	>	public void testReadAfterWriteLock()      { testReadAfterWriteLock(false); }
562	>	public void testReadAfterWriteLock_fair() { testReadAfterWriteLock(true); }
563	>	public void testReadAfterWriteLock(boolean fair) {
564	>	final PublicReentrantReadWriteLock lock =
565	>	new PublicReentrantReadWriteLock(fair);
566	>	lock.writeLock().lock();
567	>	Thread t1 = newStartedThread(new CheckedRunnable() {
568	>	public void realRun() {
569	>	lock.readLock().lock();
570	>	lock.readLock().unlock();
571	>	}});
572	>	Thread t2 = newStartedThread(new CheckedRunnable() {
573	>	public void realRun() {
574	>	lock.readLock().lock();
575	>	lock.readLock().unlock();
576	>	}});
577	>
578	>	waitForQueuedThread(lock, t1);
579	>	waitForQueuedThread(lock, t2);
580	>	releaseWriteLock(lock);
581	>	awaitTermination(t1);
582	>	awaitTermination(t2);
583	>	}
584	>
585	>	/**
586	>	* Read trylock succeeds if write locked by current thread
587	>	*/
588	>	public void testReadHoldingWriteLock()      { testReadHoldingWriteLock(false); }
589	>	public void testReadHoldingWriteLock_fair() { testReadHoldingWriteLock(true); }
590	>	public void testReadHoldingWriteLock(boolean fair) {
591	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
592	>	lock.writeLock().lock();
593	>	assertTrue(lock.readLock().tryLock());
594	>	lock.readLock().unlock();
595	>	lock.writeLock().unlock();
596	>	}
597	>
598	>	/**
599	>	* Read trylock succeeds (barging) even in the presence of waiting
600	>	* readers and/or writers
601	>	*/
602	>	public void testReadTryLockBarging()      { testReadTryLockBarging(false); }
603	>	public void testReadTryLockBarging_fair() { testReadTryLockBarging(true); }
604	>	public void testReadTryLockBarging(boolean fair) {
605	>	final PublicReentrantReadWriteLock lock =
606	>	new PublicReentrantReadWriteLock(fair);
607	>	lock.readLock().lock();
608	>
609	>	Thread t1 = newStartedThread(new CheckedRunnable() {
610	>	public void realRun() {
611	>	lock.writeLock().lock();
612	>	lock.writeLock().unlock();
613	>	}});
614	>
615	>	waitForQueuedThread(lock, t1);
616	>
617	>	Thread t2 = newStartedThread(new CheckedRunnable() {
618	>	public void realRun() {
619	>	lock.readLock().lock();
620	>	lock.readLock().unlock();
621	>	}});
622	>
623	>	if (fair)
624	>	waitForQueuedThread(lock, t2);
625	>
626	>	Thread t3 = newStartedThread(new CheckedRunnable() {
627	>	public void realRun() {
628	>	lock.readLock().tryLock();
629	>	lock.readLock().unlock();
630	>	}});
631	>
632	>	assertTrue(lock.getReadLockCount() > 0);
633	>	awaitTermination(t3);
634	>	assertTrue(t1.isAlive());
635	>	if (fair) assertTrue(t2.isAlive());
636	>	lock.readLock().unlock();
637	>	awaitTermination(t1);
638	>	awaitTermination(t2);
639	>	}
640	>
641	>	/**
642	>	* Read lock succeeds if write locked by current thread even if
643	>	* other threads are waiting for readlock
644	>	*/
645	>	public void testReadHoldingWriteLock2()      { testReadHoldingWriteLock2(false); }
646	>	public void testReadHoldingWriteLock2_fair() { testReadHoldingWriteLock2(true); }
647	>	public void testReadHoldingWriteLock2(boolean fair) {
648	>	final PublicReentrantReadWriteLock lock =
649	>	new PublicReentrantReadWriteLock(fair);
650	>	lock.writeLock().lock();
651	>	lock.readLock().lock();
652	>	lock.readLock().unlock();
653	>
654	>	Thread t1 = newStartedThread(new CheckedRunnable() {
655	>	public void realRun() {
656	>	lock.readLock().lock();
657	>	lock.readLock().unlock();
658	>	}});
659	>	Thread t2 = newStartedThread(new CheckedRunnable() {
660	>	public void realRun() {
661	>	lock.readLock().lock();
662	>	lock.readLock().unlock();
663	>	}});
664	>
665	>	waitForQueuedThread(lock, t1);
666	>	waitForQueuedThread(lock, t2);
667	>	assertWriteLockedByMoi(lock);
668	>	lock.readLock().lock();
669	>	lock.readLock().unlock();
670	>	releaseWriteLock(lock);
671	>	awaitTermination(t1);
672	>	awaitTermination(t2);
673	>	}
674	>
675	>	/**
676	>	* Read lock succeeds if write locked by current thread even if
677	>	* other threads are waiting for writelock
678	>	*/
679	>	public void testReadHoldingWriteLock3()      { testReadHoldingWriteLock3(false); }
680	>	public void testReadHoldingWriteLock3_fair() { testReadHoldingWriteLock3(true); }
681	>	public void testReadHoldingWriteLock3(boolean fair) {
682	>	final PublicReentrantReadWriteLock lock =
683	>	new PublicReentrantReadWriteLock(fair);
684	>	lock.writeLock().lock();
685	>	lock.readLock().lock();
686	>	lock.readLock().unlock();
687	>
688	>	Thread t1 = newStartedThread(new CheckedRunnable() {
689	>	public void realRun() {
690	>	lock.writeLock().lock();
691	>	lock.writeLock().unlock();
692	>	}});
693	>	Thread t2 = newStartedThread(new CheckedRunnable() {
694	>	public void realRun() {
695	>	lock.writeLock().lock();
696	>	lock.writeLock().unlock();
697	>	}});
698	>
699	>	waitForQueuedThread(lock, t1);
700	>	waitForQueuedThread(lock, t2);
701	>	assertWriteLockedByMoi(lock);
702	>	lock.readLock().lock();
703	>	lock.readLock().unlock();
704	>	assertWriteLockedByMoi(lock);
705	>	lock.writeLock().unlock();
706	>	awaitTermination(t1);
707	>	awaitTermination(t2);
708	>	}
709	>
710	>	/**
711	>	* Write lock succeeds if write locked by current thread even if
712	>	* other threads are waiting for writelock
713	>	*/
714	>	public void testWriteHoldingWriteLock4()      { testWriteHoldingWriteLock4(false); }
715	>	public void testWriteHoldingWriteLock4_fair() { testWriteHoldingWriteLock4(true); }
716	>	public void testWriteHoldingWriteLock4(boolean fair) {
717	>	final PublicReentrantReadWriteLock lock =
718	>	new PublicReentrantReadWriteLock(fair);
719	>	lock.writeLock().lock();
720	>	lock.writeLock().lock();
721	>	lock.writeLock().unlock();
722	>
723	>	Thread t1 = newStartedThread(new CheckedRunnable() {
724	>	public void realRun() {
725	>	lock.writeLock().lock();
726	>	lock.writeLock().unlock();
727	>	}});
728	>	Thread t2 = newStartedThread(new CheckedRunnable() {
729	>	public void realRun() {
730	>	lock.writeLock().lock();
731	>	lock.writeLock().unlock();
732	>	}});
733	>
734	>	waitForQueuedThread(lock, t1);
735	>	waitForQueuedThread(lock, t2);
736	>	assertWriteLockedByMoi(lock);
737	>	assertEquals(1, lock.getWriteHoldCount());
738	>	lock.writeLock().lock();
739	>	assertWriteLockedByMoi(lock);
740	>	assertEquals(2, lock.getWriteHoldCount());
741	>	lock.writeLock().unlock();
742	>	assertWriteLockedByMoi(lock);
743	>	assertEquals(1, lock.getWriteHoldCount());
744	>	lock.writeLock().unlock();
745	>	awaitTermination(t1);
746	>	awaitTermination(t2);
747	>	}
748	>
749	>	/**
750	>	* Read tryLock succeeds if readlocked but not writelocked
751	>	*/
752	>	public void testTryLockWhenReadLocked()      { testTryLockWhenReadLocked(false); }
753	>	public void testTryLockWhenReadLocked_fair() { testTryLockWhenReadLocked(true); }
754	>	public void testTryLockWhenReadLocked(boolean fair) {
755	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
756	>	lock.readLock().lock();
757	>	Thread t = newStartedThread(new CheckedRunnable() {
758	>	public void realRun() {
759	>	assertTrue(lock.readLock().tryLock());
760	>	lock.readLock().unlock();
761	>	}});
762	>
763	>	awaitTermination(t);
764	>	lock.readLock().unlock();
765	>	}
766	>
767	>	/**
768	>	* write tryLock fails when readlocked
769	>	*/
770	>	public void testWriteTryLockWhenReadLocked()      { testWriteTryLockWhenReadLocked(false); }
771	>	public void testWriteTryLockWhenReadLocked_fair() { testWriteTryLockWhenReadLocked(true); }
772	>	public void testWriteTryLockWhenReadLocked(boolean fair) {
773	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
774	>	lock.readLock().lock();
775	>	Thread t = newStartedThread(new CheckedRunnable() {
776	>	public void realRun() {
777	>	assertFalse(lock.writeLock().tryLock());
778	>	}});
779	>
780	>	awaitTermination(t);
781	>	lock.readLock().unlock();
782	>	}
783	>
784	>	/**
785	>	* write timed tryLock times out if locked
786	>	*/
787	>	public void testWriteTryLock_Timeout()      { testWriteTryLock_Timeout(false); }
788	>	public void testWriteTryLock_Timeout_fair() { testWriteTryLock_Timeout(true); }
789	>	public void testWriteTryLock_Timeout(boolean fair) {
790	>	final PublicReentrantReadWriteLock lock =
791	>	new PublicReentrantReadWriteLock(fair);
792	>	final long timeoutMillis = timeoutMillis();
793	>	lock.writeLock().lock();
794	>	Thread t = newStartedThread(new CheckedRunnable() {
795	>	public void realRun() throws InterruptedException {
796	>	long startTime = System.nanoTime();
797	>	assertFalse(lock.writeLock().tryLock(timeoutMillis, MILLISECONDS));
798	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
799	>	}});
800	>
801	>	awaitTermination(t);
802	>	releaseWriteLock(lock);
803	>	}
804	>
805	>	/**
806	>	* read timed tryLock times out if write-locked
807	>	*/
808	>	public void testReadTryLock_Timeout()      { testReadTryLock_Timeout(false); }
809	>	public void testReadTryLock_Timeout_fair() { testReadTryLock_Timeout(true); }
810	>	public void testReadTryLock_Timeout(boolean fair) {
811	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
812	>	lock.writeLock().lock();
813	>	Thread t = newStartedThread(new CheckedRunnable() {
814	>	public void realRun() throws InterruptedException {
815	>	long startTime = System.nanoTime();
816	>	long timeoutMillis = timeoutMillis();
817	>	assertFalse(lock.readLock().tryLock(timeoutMillis, MILLISECONDS));
818	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
819	>	}});
820	>
821	>	awaitTermination(t);
822	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
823	>	lock.writeLock().unlock();
824	>	}
825	>
826	>	/**
827	>	* write lockInterruptibly succeeds if unlocked, else is interruptible
828	>	*/
829	>	public void testWriteLockInterruptibly()      { testWriteLockInterruptibly(false); }
830	>	public void testWriteLockInterruptibly_fair() { testWriteLockInterruptibly(true); }
831	>	public void testWriteLockInterruptibly(boolean fair) {
832	>	final PublicReentrantReadWriteLock lock =
833	>	new PublicReentrantReadWriteLock(fair);
834	>	try {
835	>	lock.writeLock().lockInterruptibly();
836	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
837	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
838	>	public void realRun() throws InterruptedException {
839	>	lock.writeLock().lockInterruptibly();
840	>	}});
841	>
842	>	waitForQueuedThread(lock, t);
843	>	t.interrupt();
844	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
845	>	awaitTermination(t);
846	>	releaseWriteLock(lock);
847	>	}
848	>
849	>	/**
850	>	* read lockInterruptibly succeeds if lock free else is interruptible
851	>	*/
852	>	public void testReadLockInterruptibly()      { testReadLockInterruptibly(false); }
853	>	public void testReadLockInterruptibly_fair() { testReadLockInterruptibly(true); }
854	>	public void testReadLockInterruptibly(boolean fair) {
855	>	final PublicReentrantReadWriteLock lock =
856	>	new PublicReentrantReadWriteLock(fair);
857	>	try {
858	>	lock.readLock().lockInterruptibly();
859	>	lock.readLock().unlock();
860	>	lock.writeLock().lockInterruptibly();
861	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
862	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
863	>	public void realRun() throws InterruptedException {
864	>	lock.readLock().lockInterruptibly();
865	>	}});
866	>
867	>	waitForQueuedThread(lock, t);
868	>	t.interrupt();
869	>	awaitTermination(t);
870	>	releaseWriteLock(lock);
871	>	}
872	>
873	>	/**
874	>	* Calling await without holding lock throws IllegalMonitorStateException
875	>	*/
876	>	public void testAwait_IMSE()      { testAwait_IMSE(false); }
877	>	public void testAwait_IMSE_fair() { testAwait_IMSE(true); }
878	>	public void testAwait_IMSE(boolean fair) {
879	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
880	>	final Condition c = lock.writeLock().newCondition();
881	>	for (AwaitMethod awaitMethod : AwaitMethod.values()) {
882	>	long startTime = System.nanoTime();
883	>	try {
884	>	await(c, awaitMethod);
885	>	shouldThrow();
886	>	} catch (IllegalMonitorStateException success) {
887	>	} catch (InterruptedException fail) {
888	>	threadUnexpectedException(fail);
889	>	}
890	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
891	>	}
892	>	}
893	>
894	>	/**
895	>	* Calling signal without holding lock throws IllegalMonitorStateException
896	>	*/
897	>	public void testSignal_IMSE()      { testSignal_IMSE(false); }
898	>	public void testSignal_IMSE_fair() { testSignal_IMSE(true); }
899	>	public void testSignal_IMSE(boolean fair) {
900	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
901	>	final Condition c = lock.writeLock().newCondition();
902	>	try {
903	>	c.signal();
904	>	shouldThrow();
905	>	} catch (IllegalMonitorStateException success) {}
906	>	}
907	>
908	>	/**
909	>	* Calling signalAll without holding lock throws IllegalMonitorStateException
910	>	*/
911	>	public void testSignalAll_IMSE()      { testSignalAll_IMSE(false); }
912	>	public void testSignalAll_IMSE_fair() { testSignalAll_IMSE(true); }
913	>	public void testSignalAll_IMSE(boolean fair) {
914	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
915	>	final Condition c = lock.writeLock().newCondition();
916	>	try {
917	>	c.signalAll();
918	>	shouldThrow();
919	>	} catch (IllegalMonitorStateException success) {}
920	>	}
921	>
922	>	/**
923	>	* awaitNanos without a signal times out
924	>	*/
925	>	public void testAwaitNanos_Timeout()      { testAwaitNanos_Timeout(false); }
926	>	public void testAwaitNanos_Timeout_fair() { testAwaitNanos_Timeout(true); }
927	>	public void testAwaitNanos_Timeout(boolean fair) {
928	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
929	>	final Condition c = lock.writeLock().newCondition();
930	>	final long timeoutMillis = timeoutMillis();
931	>	lock.writeLock().lock();
932	>	final long startTime = System.nanoTime();
933	>	final long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis);
934	>	try {
935	>	long nanosRemaining = c.awaitNanos(timeoutNanos);
936	>	assertTrue(nanosRemaining <= 0);
937	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
938	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
939	>	lock.writeLock().unlock();
940	>	}
941	>
942	>	/**
943	>	* timed await without a signal times out
944	>	*/
945	>	public void testAwait_Timeout()      { testAwait_Timeout(false); }
946	>	public void testAwait_Timeout_fair() { testAwait_Timeout(true); }
947	>	public void testAwait_Timeout(boolean fair) {
948	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
949	>	final Condition c = lock.writeLock().newCondition();
950	>	final long timeoutMillis = timeoutMillis();
951	>	lock.writeLock().lock();
952	>	final long startTime = System.nanoTime();
953	>	try {
954	>	assertFalse(c.await(timeoutMillis, MILLISECONDS));
955	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
956	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
957	>	lock.writeLock().unlock();
958	>	}
959	>
960	>	/**
961	>	* awaitUntil without a signal times out
962	>	*/
963	>	public void testAwaitUntil_Timeout()      { testAwaitUntil_Timeout(false); }
964	>	public void testAwaitUntil_Timeout_fair() { testAwaitUntil_Timeout(true); }
965	>	public void testAwaitUntil_Timeout(boolean fair) {
966	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
967	>	final Condition c = lock.writeLock().newCondition();
968	>	lock.writeLock().lock();
969	>	// We shouldn't assume that nanoTime and currentTimeMillis
970	>	// use the same time source, so don't use nanoTime here.
971	>	final java.util.Date delayedDate = delayedDate(timeoutMillis());
972	>	try {
973	>	assertFalse(c.awaitUntil(delayedDate));
974	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
975	>	assertTrue(new java.util.Date().getTime() >= delayedDate.getTime());
976	>	lock.writeLock().unlock();
977	>	}
978	>
979	>	/**
980	>	* await returns when signalled
981	>	*/
982	>	public void testAwait()      { testAwait(false); }
983	>	public void testAwait_fair() { testAwait(true); }
984	>	public void testAwait(boolean fair) {
985	>	final PublicReentrantReadWriteLock lock =
986	>	new PublicReentrantReadWriteLock(fair);
987	>	final Condition c = lock.writeLock().newCondition();
988	>	final CountDownLatch locked = new CountDownLatch(1);
989	>	Thread t = newStartedThread(new CheckedRunnable() {
990	>	public void realRun() throws InterruptedException {
991	>	lock.writeLock().lock();
992	>	locked.countDown();
993	>	c.await();
994	>	lock.writeLock().unlock();
995	>	}});
996	>
997	>	await(locked);
998	>	lock.writeLock().lock();
999	>	assertHasWaiters(lock, c, t);
1000	>	c.signal();
1001	>	assertHasNoWaiters(lock, c);
1002	>	assertTrue(t.isAlive());
1003	>	lock.writeLock().unlock();
1004	>	awaitTermination(t);
1005	>	}
1006	>
1007	>	/**
1008	>	* awaitUninterruptibly is uninterruptible
1009	>	*/
1010	>	public void testAwaitUninterruptibly()      { testAwaitUninterruptibly(false); }
1011	>	public void testAwaitUninterruptibly_fair() { testAwaitUninterruptibly(true); }
1012	>	public void testAwaitUninterruptibly(boolean fair) {
1013	>	final Lock lock = new ReentrantReadWriteLock(fair).writeLock();
1014	>	final Condition condition = lock.newCondition();
1015	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(2);
1016	>
1017	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1018	>	public void realRun() {
1019	>	// Interrupt before awaitUninterruptibly
1020	>	lock.lock();
1021	>	pleaseInterrupt.countDown();
1022	>	Thread.currentThread().interrupt();
1023	>	condition.awaitUninterruptibly();
1024	>	assertTrue(Thread.interrupted());
1025	>	lock.unlock();
1026	>	}});
1027	>
1028	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1029	>	public void realRun() {
1030	>	// Interrupt during awaitUninterruptibly
1031	>	lock.lock();
1032	>	pleaseInterrupt.countDown();
1033	>	condition.awaitUninterruptibly();
1034	>	assertTrue(Thread.interrupted());
1035	>	lock.unlock();
1036	>	}});
1037	>
1038	>	await(pleaseInterrupt);
1039	>	t2.interrupt();
1040	>	lock.lock();
1041	>	lock.unlock();
1042	>	assertThreadBlocks(t1, Thread.State.WAITING);
1043	>	assertThreadBlocks(t2, Thread.State.WAITING);
1044	>
1045	>	lock.lock();
1046	>	condition.signalAll();
1047	>	lock.unlock();
1048	>
1049	>	awaitTermination(t1);
1050	>	awaitTermination(t2);
1051	>	}
1052	>
1053	>	/**
1054	>	* await/awaitNanos/awaitUntil is interruptible
1055	>	*/
1056	>	public void testInterruptible_await()           { testInterruptible(false, AwaitMethod.await); }
1057	>	public void testInterruptible_await_fair()      { testInterruptible(true,  AwaitMethod.await); }
1058	>	public void testInterruptible_awaitTimed()      { testInterruptible(false, AwaitMethod.awaitTimed); }
1059	>	public void testInterruptible_awaitTimed_fair() { testInterruptible(true,  AwaitMethod.awaitTimed); }
1060	>	public void testInterruptible_awaitNanos()      { testInterruptible(false, AwaitMethod.awaitNanos); }
1061	>	public void testInterruptible_awaitNanos_fair() { testInterruptible(true,  AwaitMethod.awaitNanos); }
1062	>	public void testInterruptible_awaitUntil()      { testInterruptible(false, AwaitMethod.awaitUntil); }
1063	>	public void testInterruptible_awaitUntil_fair() { testInterruptible(true,  AwaitMethod.awaitUntil); }
1064	>	public void testInterruptible(boolean fair, final AwaitMethod awaitMethod) {
1065	>	final PublicReentrantReadWriteLock lock =
1066	>	new PublicReentrantReadWriteLock(fair);
1067	>	final Condition c = lock.writeLock().newCondition();
1068	>	final CountDownLatch locked = new CountDownLatch(1);
1069	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1070	>	public void realRun() throws InterruptedException {
1071	>	lock.writeLock().lock();
1072	>	assertWriteLockedByMoi(lock);
1073	>	assertHasNoWaiters(lock, c);
1074	>	locked.countDown();
1075	>	try {
1076	>	await(c, awaitMethod);
1077	>	} finally {
1078	>	assertWriteLockedByMoi(lock);
1079	>	assertHasNoWaiters(lock, c);
1080	>	lock.writeLock().unlock();
1081	>	assertFalse(Thread.interrupted());
1082	>	}
1083	>	}});
1084	>
1085	>	await(locked);
1086	>	assertHasWaiters(lock, c, t);
1087	>	t.interrupt();
1088	>	awaitTermination(t);
1089	>	assertNotWriteLocked(lock);
1090	>	}
1091	>
1092	>	/**
1093	>	* signalAll wakes up all threads
1094	>	*/
1095	>	public void testSignalAll_await()           { testSignalAll(false, AwaitMethod.await); }
1096	>	public void testSignalAll_await_fair()      { testSignalAll(true,  AwaitMethod.await); }
1097	>	public void testSignalAll_awaitTimed()      { testSignalAll(false, AwaitMethod.awaitTimed); }
1098	>	public void testSignalAll_awaitTimed_fair() { testSignalAll(true,  AwaitMethod.awaitTimed); }
1099	>	public void testSignalAll_awaitNanos()      { testSignalAll(false, AwaitMethod.awaitNanos); }
1100	>	public void testSignalAll_awaitNanos_fair() { testSignalAll(true,  AwaitMethod.awaitNanos); }
1101	>	public void testSignalAll_awaitUntil()      { testSignalAll(false, AwaitMethod.awaitUntil); }
1102	>	public void testSignalAll_awaitUntil_fair() { testSignalAll(true,  AwaitMethod.awaitUntil); }
1103	>	public void testSignalAll(boolean fair, final AwaitMethod awaitMethod) {
1104	>	final PublicReentrantReadWriteLock lock =
1105	>	new PublicReentrantReadWriteLock(fair);
1106	>	final Condition c = lock.writeLock().newCondition();
1107	>	final CountDownLatch locked = new CountDownLatch(2);
1108	>	final Lock writeLock = lock.writeLock();
1109	>	class Awaiter extends CheckedRunnable {
1110	>	public void realRun() throws InterruptedException {
1111	>	writeLock.lock();
1112	>	locked.countDown();
1113	>	await(c, awaitMethod);
1114	>	writeLock.unlock();
1115	>	}
1116	>	}
1117	>
1118	>	Thread t1 = newStartedThread(new Awaiter());
1119	>	Thread t2 = newStartedThread(new Awaiter());
1120	>
1121	>	await(locked);
1122	>	writeLock.lock();
1123	>	assertHasWaiters(lock, c, t1, t2);
1124	>	c.signalAll();
1125	>	assertHasNoWaiters(lock, c);
1126	>	writeLock.unlock();
1127	>	awaitTermination(t1);
1128	>	awaitTermination(t2);
1129	>	}
1130	>
1131	>	/**
1132	>	* signal wakes up waiting threads in FIFO order
1133	>	*/
1134	>	public void testSignalWakesFifo()      { testSignalWakesFifo(false); }
1135	>	public void testSignalWakesFifo_fair() { testSignalWakesFifo(true); }
1136	>	public void testSignalWakesFifo(boolean fair) {
1137	>	final PublicReentrantReadWriteLock lock =
1138	>	new PublicReentrantReadWriteLock(fair);
1139	>	final Condition c = lock.writeLock().newCondition();
1140	>	final CountDownLatch locked1 = new CountDownLatch(1);
1141	>	final CountDownLatch locked2 = new CountDownLatch(1);
1142	>	final Lock writeLock = lock.writeLock();
1143	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1144	>	public void realRun() throws InterruptedException {
1145	>	writeLock.lock();
1146	>	locked1.countDown();
1147	>	c.await();
1148	>	writeLock.unlock();
1149	>	}});
1150	>
1151	>	await(locked1);
1152	>
1153	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1154	>	public void realRun() throws InterruptedException {
1155	>	writeLock.lock();
1156	>	locked2.countDown();
1157	>	c.await();
1158	>	writeLock.unlock();
1159	>	}});
1160	>
1161	>	await(locked2);
1162	>
1163	>	writeLock.lock();
1164	>	assertHasWaiters(lock, c, t1, t2);
1165	>	assertFalse(lock.hasQueuedThreads());
1166	>	c.signal();
1167	>	assertHasWaiters(lock, c, t2);
1168	>	assertTrue(lock.hasQueuedThread(t1));
1169	>	assertFalse(lock.hasQueuedThread(t2));
1170	>	c.signal();
1171	>	assertHasNoWaiters(lock, c);
1172	>	assertTrue(lock.hasQueuedThread(t1));
1173	>	assertTrue(lock.hasQueuedThread(t2));
1174	>	writeLock.unlock();
1175	>	awaitTermination(t1);
1176	>	awaitTermination(t2);
1177	>	}
1178	>
1179	>	/**
1180	>	* await after multiple reentrant locking preserves lock count
1181	>	*/
1182	>	public void testAwaitLockCount()      { testAwaitLockCount(false); }
1183	>	public void testAwaitLockCount_fair() { testAwaitLockCount(true); }
1184	>	public void testAwaitLockCount(boolean fair) {
1185	>	final PublicReentrantReadWriteLock lock =
1186	>	new PublicReentrantReadWriteLock(fair);
1187	>	final Condition c = lock.writeLock().newCondition();
1188	>	final CountDownLatch locked = new CountDownLatch(2);
1189	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1190	>	public void realRun() throws InterruptedException {
1191	>	lock.writeLock().lock();
1192	>	assertWriteLockedByMoi(lock);
1193	>	assertEquals(1, lock.writeLock().getHoldCount());
1194	>	locked.countDown();
1195	>	c.await();
1196	>	assertWriteLockedByMoi(lock);
1197	>	assertEquals(1, lock.writeLock().getHoldCount());
1198	>	lock.writeLock().unlock();
1199	>	}});
1200	>
1201	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1202	>	public void realRun() throws InterruptedException {
1203	>	lock.writeLock().lock();
1204	>	lock.writeLock().lock();
1205	>	assertWriteLockedByMoi(lock);
1206	>	assertEquals(2, lock.writeLock().getHoldCount());
1207	>	locked.countDown();
1208	>	c.await();
1209	>	assertWriteLockedByMoi(lock);
1210	>	assertEquals(2, lock.writeLock().getHoldCount());
1211	>	lock.writeLock().unlock();
1212	>	lock.writeLock().unlock();
1213	>	}});
1214	>
1215	>	await(locked);
1216	>	lock.writeLock().lock();
1217	>	assertHasWaiters(lock, c, t1, t2);
1218	>	c.signalAll();
1219	>	assertHasNoWaiters(lock, c);
1220	>	lock.writeLock().unlock();
1221	>	awaitTermination(t1);
1222	>	awaitTermination(t2);
1223	>	}
1224	>
1225	>	/**
1226	>	* A serialized lock deserializes as unlocked
1227	>	*/
1228	>	public void testSerialization()      { testSerialization(false); }
1229	>	public void testSerialization_fair() { testSerialization(true); }
1230	>	public void testSerialization(boolean fair) {
1231	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1232	>	lock.writeLock().lock();
1233	>	lock.readLock().lock();
1234	>
1235	>	ReentrantReadWriteLock clone = serialClone(lock);
1236	>	assertEquals(lock.isFair(), clone.isFair());
1237	>	assertTrue(lock.isWriteLocked());
1238	>	assertFalse(clone.isWriteLocked());
1239	>	assertEquals(1, lock.getReadLockCount());
1240	>	assertEquals(0, clone.getReadLockCount());
1241	>	clone.writeLock().lock();
1242	>	clone.readLock().lock();
1243	>	assertTrue(clone.isWriteLocked());
1244	>	assertEquals(1, clone.getReadLockCount());
1245	>	clone.readLock().unlock();
1246	>	clone.writeLock().unlock();
1247	>	assertFalse(clone.isWriteLocked());
1248	>	assertEquals(1, lock.getReadLockCount());
1249	>	assertEquals(0, clone.getReadLockCount());
1250	>	}
1251	>
1252	>	/**
1253	>	* hasQueuedThreads reports whether there are waiting threads
1254	>	*/
1255	>	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
1256	>	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
1257	>	public void testHasQueuedThreads(boolean fair) {
1258	>	final PublicReentrantReadWriteLock lock =
1259	>	new PublicReentrantReadWriteLock(fair);
1260	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1261	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1262	>	assertFalse(lock.hasQueuedThreads());
1263	>	lock.writeLock().lock();
1264	>	assertFalse(lock.hasQueuedThreads());
1265	>	t1.start();
1266	>	waitForQueuedThread(lock, t1);
1267	>	assertTrue(lock.hasQueuedThreads());
1268	>	t2.start();
1269	>	waitForQueuedThread(lock, t2);
1270	>	assertTrue(lock.hasQueuedThreads());
1271	>	t1.interrupt();
1272	>	awaitTermination(t1);
1273	>	assertTrue(lock.hasQueuedThreads());
1274	>	lock.writeLock().unlock();
1275	>	awaitTermination(t2);
1276	>	assertFalse(lock.hasQueuedThreads());
1277	>	}
1278	>
1279	>	/**
1280	>	* hasQueuedThread(null) throws NPE
1281	>	*/
1282	>	public void testHasQueuedThreadNPE()      { testHasQueuedThreadNPE(false); }
1283	>	public void testHasQueuedThreadNPE_fair() { testHasQueuedThreadNPE(true); }
1284	>	public void testHasQueuedThreadNPE(boolean fair) {
1285	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1286	>	try {
1287	>	lock.hasQueuedThread(null);
1288	>	shouldThrow();
1289	>	} catch (NullPointerException success) {}
1290	>	}
1291	>
1292	>	/**
1293	>	* hasQueuedThread reports whether a thread is queued
1294	>	*/
1295	>	public void testHasQueuedThread()      { testHasQueuedThread(false); }
1296	>	public void testHasQueuedThread_fair() { testHasQueuedThread(true); }
1297	>	public void testHasQueuedThread(boolean fair) {
1298	>	final PublicReentrantReadWriteLock lock =
1299	>	new PublicReentrantReadWriteLock(fair);
1300	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1301	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1302	>	assertFalse(lock.hasQueuedThread(t1));
1303	>	assertFalse(lock.hasQueuedThread(t2));
1304	>	lock.writeLock().lock();
1305	>	t1.start();
1306	>	waitForQueuedThread(lock, t1);
1307	>	assertTrue(lock.hasQueuedThread(t1));
1308	>	assertFalse(lock.hasQueuedThread(t2));
1309	>	t2.start();
1310	>	waitForQueuedThread(lock, t2);
1311	>	assertTrue(lock.hasQueuedThread(t1));
1312	>	assertTrue(lock.hasQueuedThread(t2));
1313	>	t1.interrupt();
1314	>	awaitTermination(t1);
1315	>	assertFalse(lock.hasQueuedThread(t1));
1316	>	assertTrue(lock.hasQueuedThread(t2));
1317	>	lock.writeLock().unlock();
1318	>	awaitTermination(t2);
1319	>	assertFalse(lock.hasQueuedThread(t1));
1320	>	assertFalse(lock.hasQueuedThread(t2));
1321	>	}
1322	>
1323	>	/**
1324	>	* getQueueLength reports number of waiting threads
1325	>	*/
1326	>	public void testGetQueueLength()      { testGetQueueLength(false); }
1327	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
1328	>	public void testGetQueueLength(boolean fair) {
1329	>	final PublicReentrantReadWriteLock lock =
1330	>	new PublicReentrantReadWriteLock(fair);
1331	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1332	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1333	>	assertEquals(0, lock.getQueueLength());
1334	>	lock.writeLock().lock();
1335	>	t1.start();
1336	>	waitForQueuedThread(lock, t1);
1337	>	assertEquals(1, lock.getQueueLength());
1338	>	t2.start();
1339	>	waitForQueuedThread(lock, t2);
1340	>	assertEquals(2, lock.getQueueLength());
1341	>	t1.interrupt();
1342	>	awaitTermination(t1);
1343	>	assertEquals(1, lock.getQueueLength());
1344	>	lock.writeLock().unlock();
1345	>	awaitTermination(t2);
1346	>	assertEquals(0, lock.getQueueLength());
1347	>	}
1348	>
1349	>	/**
1350	>	* getQueuedThreads includes waiting threads
1351	>	*/
1352	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
1353	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
1354	>	public void testGetQueuedThreads(boolean fair) {
1355	>	final PublicReentrantReadWriteLock lock =
1356	>	new PublicReentrantReadWriteLock(fair);
1357	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1358	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1359	>	assertTrue(lock.getQueuedThreads().isEmpty());
1360	>	lock.writeLock().lock();
1361	>	assertTrue(lock.getQueuedThreads().isEmpty());
1362	>	t1.start();
1363	>	waitForQueuedThread(lock, t1);
1364	>	assertEquals(1, lock.getQueuedThreads().size());
1365	>	assertTrue(lock.getQueuedThreads().contains(t1));
1366	>	t2.start();
1367	>	waitForQueuedThread(lock, t2);
1368	>	assertEquals(2, lock.getQueuedThreads().size());
1369	>	assertTrue(lock.getQueuedThreads().contains(t1));
1370	>	assertTrue(lock.getQueuedThreads().contains(t2));
1371	>	t1.interrupt();
1372	>	awaitTermination(t1);
1373	>	assertFalse(lock.getQueuedThreads().contains(t1));
1374	>	assertTrue(lock.getQueuedThreads().contains(t2));
1375	>	assertEquals(1, lock.getQueuedThreads().size());
1376	>	lock.writeLock().unlock();
1377	>	awaitTermination(t2);
1378	>	assertTrue(lock.getQueuedThreads().isEmpty());
1379	>	}
1380	>
1381	>	/**
1382	>	* hasWaiters throws NPE if null
1383	>	*/
1384	>	public void testHasWaitersNPE()      { testHasWaitersNPE(false); }
1385	>	public void testHasWaitersNPE_fair() { testHasWaitersNPE(true); }
1386	>	public void testHasWaitersNPE(boolean fair) {
1387	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1388	>	try {
1389	>	lock.hasWaiters(null);
1390	>	shouldThrow();
1391	>	} catch (NullPointerException success) {}
1392	>	}
1393	>
1394	>	/**
1395	>	* getWaitQueueLength throws NPE if null
1396	>	*/
1397	>	public void testGetWaitQueueLengthNPE()      { testGetWaitQueueLengthNPE(false); }
1398	>	public void testGetWaitQueueLengthNPE_fair() { testGetWaitQueueLengthNPE(true); }
1399	>	public void testGetWaitQueueLengthNPE(boolean fair) {
1400	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1401	>	try {
1402	>	lock.getWaitQueueLength(null);
1403	>	shouldThrow();
1404	>	} catch (NullPointerException success) {}
1405	>	}
1406	>
1407	>	/**
1408	>	* getWaitingThreads throws NPE if null
1409	>	*/
1410	>	public void testGetWaitingThreadsNPE()      { testGetWaitingThreadsNPE(false); }
1411	>	public void testGetWaitingThreadsNPE_fair() { testGetWaitingThreadsNPE(true); }
1412	>	public void testGetWaitingThreadsNPE(boolean fair) {
1413	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(fair);
1414	>	try {
1415	>	lock.getWaitingThreads(null);
1416	>	shouldThrow();
1417	>	} catch (NullPointerException success) {}
1418	>	}
1419	>
1420	>	/**
1421	>	* hasWaiters throws IllegalArgumentException if not owned
1422	>	*/
1423	>	public void testHasWaitersIAE()      { testHasWaitersIAE(false); }
1424	>	public void testHasWaitersIAE_fair() { testHasWaitersIAE(true); }
1425	>	public void testHasWaitersIAE(boolean fair) {
1426	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1427	>	final Condition c = lock.writeLock().newCondition();
1428	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(fair);
1429	>	try {
1430	>	lock2.hasWaiters(c);
1431	>	shouldThrow();
1432	>	} catch (IllegalArgumentException success) {}
1433		}
1434
1435	+	/**
1436	+	* hasWaiters throws IllegalMonitorStateException if not locked
1437	+	*/
1438	+	public void testHasWaitersIMSE()      { testHasWaitersIMSE(false); }
1439	+	public void testHasWaitersIMSE_fair() { testHasWaitersIMSE(true); }
1440	+	public void testHasWaitersIMSE(boolean fair) {
1441	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1442	+	final Condition c = lock.writeLock().newCondition();
1443	+	try {
1444	+	lock.hasWaiters(c);
1445	+	shouldThrow();
1446	+	} catch (IllegalMonitorStateException success) {}
1447	+	}
1448
1449	<	private static long SHORT_DELAY_MS = 100;
1450	<	private static long MEDIUM_DELAY_MS = 1000;
1451	<	private static long LONG_DELAY_MS = 10000;
1452	<
1453	<	/*
1454	<	* Unlocks an unlocked lock, throws Illegal Monitor State
1455	<	*
1456	<	*/
1457	<
1458	<	public void testIllegalMonitorStateException(){
1459	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
1460	<	try{
1461	<	rl.writeLock().unlock();
37	<	fail("Should of thown Illegal Monitor State Exception");
38	<
39	<	}catch(IllegalMonitorStateException sucess){}
40	<
41	<
42	<	}
43	<
44	<	/*
45	<	* makes a lock, locks it, tries to aquire the lock in another thread
46	<	* interrupts that thread and waits for an interrupted Exception to
47	<	* be thrown.
48	<	*/
49	<
50	<	public void testInterruptedException(){
51	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
52	<	lock.writeLock().lock();
53	<	Thread t = new Thread(new Runnable() {
54	<	public void run(){
55	<	try{
56	<	lock.writeLock().lockInterruptibly();
57	<	fail("should throw");
58	<	}catch(InterruptedException sucess){}
59	<	}
60	<	});
61	<	t.start();
62	<	t.interrupt();
63	<	lock.writeLock().unlock();
64	<	}
65	<
66	<	/*
67	<	* tests for interrupted exception on a timed wait
68	<	*
69	<	*/
70	<
71	<
72	<	public void testInterruptedException2(){
73	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
74	<	lock.writeLock().lock();
75	<	Thread t = new Thread(new Runnable() {
76	<	public void run(){
77	<	try{
78	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
79	<	fail("should throw");
80	<	}catch(InterruptedException sucess){}
81	<	}
82	<	});
83	<	t.start();
84	<	t.interrupt();
85	<	}
86	<
87	<
88	<
89	<	/*
90	<	* current thread locks interruptibly the thread
91	<	* another thread tries to aquire the lock and blocks
92	<	* on the call. interrupt the attempted aquireLock
93	<	* assert that the first lock() call actually locked the lock
94	<	* assert that the current thread is the one holding the lock
95	<	*/
96	<
97	<	public void testLockedInterruptibly() {
98	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
99	<	try {lock.writeLock().lockInterruptibly();} catch(Exception e) {}
100	<	Thread t = new Thread(new Runnable() {
101	<	public void run() {
102	<	try {
103	<	lock.writeLock().lockInterruptibly();
104	<	fail("Failed to generate an Interrupted Exception");
105	<	}
106	<	catch(InterruptedException e) {}
107	<	}
108	<	});
109	<	t.start();
110	<	t.interrupt();
1449	>	/**
1450	>	* getWaitQueueLength throws IllegalArgumentException if not owned
1451	>	*/
1452	>	public void testGetWaitQueueLengthIAE()      { testGetWaitQueueLengthIAE(false); }
1453	>	public void testGetWaitQueueLengthIAE_fair() { testGetWaitQueueLengthIAE(true); }
1454	>	public void testGetWaitQueueLengthIAE(boolean fair) {
1455	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1456	>	final Condition c = lock.writeLock().newCondition();
1457	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(fair);
1458	>	try {
1459	>	lock2.getWaitQueueLength(c);
1460	>	shouldThrow();
1461	>	} catch (IllegalArgumentException success) {}
1462		}
112	–
1463
1464	+	/**
1465	+	* getWaitQueueLength throws IllegalMonitorStateException if not locked
1466	+	*/
1467	+	public void testGetWaitQueueLengthIMSE()      { testGetWaitQueueLengthIMSE(false); }
1468	+	public void testGetWaitQueueLengthIMSE_fair() { testGetWaitQueueLengthIMSE(true); }
1469	+	public void testGetWaitQueueLengthIMSE(boolean fair) {
1470	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1471	+	final Condition c = lock.writeLock().newCondition();
1472	+	try {
1473	+	lock.getWaitQueueLength(c);
1474	+	shouldThrow();
1475	+	} catch (IllegalMonitorStateException success) {}
1476	+	}
1477	+
1478	+	/**
1479	+	* getWaitingThreads throws IllegalArgumentException if not owned
1480	+	*/
1481	+	public void testGetWaitingThreadsIAE()      { testGetWaitingThreadsIAE(false); }
1482	+	public void testGetWaitingThreadsIAE_fair() { testGetWaitingThreadsIAE(true); }
1483	+	public void testGetWaitingThreadsIAE(boolean fair) {
1484	+	final PublicReentrantReadWriteLock lock =
1485	+	new PublicReentrantReadWriteLock(fair);
1486	+	final Condition c = lock.writeLock().newCondition();
1487	+	final PublicReentrantReadWriteLock lock2 =
1488	+	new PublicReentrantReadWriteLock(fair);
1489	+	try {
1490	+	lock2.getWaitingThreads(c);
1491	+	shouldThrow();
1492	+	} catch (IllegalArgumentException success) {}
1493	+	}
1494	+
1495	+	/**
1496	+	* getWaitingThreads throws IllegalMonitorStateException if not locked
1497	+	*/
1498	+	public void testGetWaitingThreadsIMSE()      { testGetWaitingThreadsIMSE(false); }
1499	+	public void testGetWaitingThreadsIMSE_fair() { testGetWaitingThreadsIMSE(true); }
1500	+	public void testGetWaitingThreadsIMSE(boolean fair) {
1501	+	final PublicReentrantReadWriteLock lock =
1502	+	new PublicReentrantReadWriteLock(fair);
1503	+	final Condition c = lock.writeLock().newCondition();
1504	+	try {
1505	+	lock.getWaitingThreads(c);
1506	+	shouldThrow();
1507	+	} catch (IllegalMonitorStateException success) {}
1508	+	}
1509	+
1510	+	/**
1511	+	* hasWaiters returns true when a thread is waiting, else false
1512	+	*/
1513	+	public void testHasWaiters()      { testHasWaiters(false); }
1514	+	public void testHasWaiters_fair() { testHasWaiters(true); }
1515	+	public void testHasWaiters(boolean fair) {
1516	+	final PublicReentrantReadWriteLock lock =
1517	+	new PublicReentrantReadWriteLock(fair);
1518	+	final Condition c = lock.writeLock().newCondition();
1519	+	final CountDownLatch locked = new CountDownLatch(1);
1520	+	Thread t = newStartedThread(new CheckedRunnable() {
1521	+	public void realRun() throws InterruptedException {
1522	+	lock.writeLock().lock();
1523	+	assertHasNoWaiters(lock, c);
1524	+	assertFalse(lock.hasWaiters(c));
1525	+	locked.countDown();
1526	+	c.await();
1527	+	assertHasNoWaiters(lock, c);
1528	+	assertFalse(lock.hasWaiters(c));
1529	+	lock.writeLock().unlock();
1530	+	}});
1531	+
1532	+	await(locked);
1533	+	lock.writeLock().lock();
1534	+	assertHasWaiters(lock, c, t);
1535	+	assertTrue(lock.hasWaiters(c));
1536	+	c.signal();
1537	+	assertHasNoWaiters(lock, c);
1538	+	assertFalse(lock.hasWaiters(c));
1539	+	lock.writeLock().unlock();
1540	+	awaitTermination(t);
1541	+	assertHasNoWaiters(lock, c);
1542	+	}
1543	+
1544	+	/**
1545	+	* getWaitQueueLength returns number of waiting threads
1546	+	*/
1547	+	public void testGetWaitQueueLength()      { testGetWaitQueueLength(false); }
1548	+	public void testGetWaitQueueLength_fair() { testGetWaitQueueLength(true); }
1549	+	public void testGetWaitQueueLength(boolean fair) {
1550	+	final PublicReentrantReadWriteLock lock =
1551	+	new PublicReentrantReadWriteLock(fair);
1552	+	final Condition c = lock.writeLock().newCondition();
1553	+	final CountDownLatch locked = new CountDownLatch(1);
1554	+	Thread t = newStartedThread(new CheckedRunnable() {
1555	+	public void realRun() throws InterruptedException {
1556	+	lock.writeLock().lock();
1557	+	assertEquals(0, lock.getWaitQueueLength(c));
1558	+	locked.countDown();
1559	+	c.await();
1560	+	lock.writeLock().unlock();
1561	+	}});
1562	+
1563	+	await(locked);
1564	+	lock.writeLock().lock();
1565	+	assertHasWaiters(lock, c, t);
1566	+	assertEquals(1, lock.getWaitQueueLength(c));
1567	+	c.signal();
1568	+	assertHasNoWaiters(lock, c);
1569	+	assertEquals(0, lock.getWaitQueueLength(c));
1570	+	lock.writeLock().unlock();
1571	+	awaitTermination(t);
1572	+	}
1573	+
1574	+	/**
1575	+	* getWaitingThreads returns only and all waiting threads
1576	+	*/
1577	+	public void testGetWaitingThreads()      { testGetWaitingThreads(false); }
1578	+	public void testGetWaitingThreads_fair() { testGetWaitingThreads(true); }
1579	+	public void testGetWaitingThreads(boolean fair) {
1580	+	final PublicReentrantReadWriteLock lock =
1581	+	new PublicReentrantReadWriteLock(fair);
1582	+	final Condition c = lock.writeLock().newCondition();
1583	+	final CountDownLatch locked1 = new CountDownLatch(1);
1584	+	final CountDownLatch locked2 = new CountDownLatch(1);
1585	+	Thread t1 = new Thread(new CheckedRunnable() {
1586	+	public void realRun() throws InterruptedException {
1587	+	lock.writeLock().lock();
1588	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1589	+	locked1.countDown();
1590	+	c.await();
1591	+	lock.writeLock().unlock();
1592	+	}});
1593	+
1594	+	Thread t2 = new Thread(new CheckedRunnable() {
1595	+	public void realRun() throws InterruptedException {
1596	+	lock.writeLock().lock();
1597	+	assertFalse(lock.getWaitingThreads(c).isEmpty());
1598	+	locked2.countDown();
1599	+	c.await();
1600	+	lock.writeLock().unlock();
1601	+	}});
1602	+
1603	+	lock.writeLock().lock();
1604	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1605	+	lock.writeLock().unlock();
1606	+
1607	+	t1.start();
1608	+	await(locked1);
1609	+	t2.start();
1610	+	await(locked2);
1611	+
1612	+	lock.writeLock().lock();
1613	+	assertTrue(lock.hasWaiters(c));
1614	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1615	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1616	+	assertEquals(2, lock.getWaitingThreads(c).size());
1617	+	c.signalAll();
1618	+	assertHasNoWaiters(lock, c);
1619	+	lock.writeLock().unlock();
1620	+
1621	+	awaitTermination(t1);
1622	+	awaitTermination(t2);
1623	+
1624	+	assertHasNoWaiters(lock, c);
1625	+	}
1626	+
1627	+	/**
1628	+	* toString indicates current lock state
1629	+	*/
1630	+	public void testToString()      { testToString(false); }
1631	+	public void testToString_fair() { testToString(true); }
1632	+	public void testToString(boolean fair) {
1633	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1634	+	assertTrue(lock.toString().contains("Write locks = 0"));
1635	+	assertTrue(lock.toString().contains("Read locks = 0"));
1636	+	lock.writeLock().lock();
1637	+	assertTrue(lock.toString().contains("Write locks = 1"));
1638	+	assertTrue(lock.toString().contains("Read locks = 0"));
1639	+	lock.writeLock().lock();
1640	+	assertTrue(lock.toString().contains("Write locks = 2"));
1641	+	assertTrue(lock.toString().contains("Read locks = 0"));
1642	+	lock.writeLock().unlock();
1643	+	lock.writeLock().unlock();
1644	+	lock.readLock().lock();
1645	+	assertTrue(lock.toString().contains("Write locks = 0"));
1646	+	assertTrue(lock.toString().contains("Read locks = 1"));
1647	+	lock.readLock().lock();
1648	+	assertTrue(lock.toString().contains("Write locks = 0"));
1649	+	assertTrue(lock.toString().contains("Read locks = 2"));
1650	+	}
1651	+
1652	+	/**
1653	+	* readLock.toString indicates current lock state
1654	+	*/
1655	+	public void testReadLockToString()      { testReadLockToString(false); }
1656	+	public void testReadLockToString_fair() { testReadLockToString(true); }
1657	+	public void testReadLockToString(boolean fair) {
1658	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1659	+	assertTrue(lock.readLock().toString().contains("Read locks = 0"));
1660	+	lock.readLock().lock();
1661	+	assertTrue(lock.readLock().toString().contains("Read locks = 1"));
1662	+	lock.readLock().lock();
1663	+	assertTrue(lock.readLock().toString().contains("Read locks = 2"));
1664	+	lock.readLock().unlock();
1665	+	assertTrue(lock.readLock().toString().contains("Read locks = 1"));
1666	+	lock.readLock().unlock();
1667	+	assertTrue(lock.readLock().toString().contains("Read locks = 0"));
1668	+	}
1669	+
1670	+	/**
1671	+	* writeLock.toString indicates current lock state
1672	+	*/
1673	+	public void testWriteLockToString()      { testWriteLockToString(false); }
1674	+	public void testWriteLockToString_fair() { testWriteLockToString(true); }
1675	+	public void testWriteLockToString(boolean fair) {
1676	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1677	+	assertTrue(lock.writeLock().toString().contains("Unlocked"));
1678	+	lock.writeLock().lock();
1679	+	assertTrue(lock.writeLock().toString().contains("Locked by"));
1680	+	lock.writeLock().unlock();
1681	+	assertTrue(lock.writeLock().toString().contains("Unlocked"));
1682	+	}
1683	+
1684	+	/**
1685	+	* ThreadMXBean reports the blockers that we expect.
1686	+	*/
1687	+	public void testBlockers() {
1688	+	if (!testImplementationDetails) return;
1689	+	final boolean fair = randomBoolean();
1690	+	final boolean timedAcquire = randomBoolean();
1691	+	final boolean timedAwait = randomBoolean();
1692	+	final String syncClassName = fair
1693	+	? "ReentrantReadWriteLock$FairSync"
1694	+	: "ReentrantReadWriteLock$NonfairSync";
1695	+	final String conditionClassName
1696	+	= "AbstractQueuedSynchronizer$ConditionObject";
1697	+	final Thread.State expectedAcquireState = timedAcquire
1698	+	? Thread.State.TIMED_WAITING
1699	+	: Thread.State.WAITING;
1700	+	final Thread.State expectedAwaitState = timedAwait
1701	+	? Thread.State.TIMED_WAITING
1702	+	: Thread.State.WAITING;
1703	+	final Lock lock = new ReentrantReadWriteLock(fair).writeLock();
1704	+	final Condition condition = lock.newCondition();
1705	+	final AtomicBoolean conditionSatisfied = new AtomicBoolean(false);
1706	+	lock.lock();
1707	+	final Thread thread = newStartedThread((Action) () -> {
1708	+	if (timedAcquire)
1709	+	lock.tryLock(LONGER_DELAY_MS, MILLISECONDS);
1710	+	else
1711	+	lock.lock();
1712	+	while (!conditionSatisfied.get())
1713	+	if (timedAwait)
1714	+	condition.await(LONGER_DELAY_MS, MILLISECONDS);
1715	+	else
1716	+	condition.await();
1717	+	});
1718	+	Callable<Boolean> waitingForLock = () -> {
1719	+	String className;
1720	+	return thread.getState() == expectedAcquireState
1721	+	&& (className = blockerClassName(thread)) != null
1722	+	&& className.endsWith(syncClassName);
1723	+	};
1724	+	waitForThreadToEnterWaitState(thread, waitingForLock);
1725	+
1726	+	lock.unlock();
1727	+	Callable<Boolean> waitingForCondition = () -> {
1728	+	String className;
1729	+	return thread.getState() == expectedAwaitState
1730	+	&& (className = blockerClassName(thread)) != null
1731	+	&& className.endsWith(conditionClassName);
1732	+	};
1733	+	waitForThreadToEnterWaitState(thread, waitingForCondition);
1734	+
1735	+	// politely release the waiter
1736	+	conditionSatisfied.set(true);
1737	+	lock.lock();
1738	+	try {
1739	+	condition.signal();
1740	+	} finally { lock.unlock(); }
1741	+
1742	+	awaitTermination(thread);
1743	+	}
1744		}

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