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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.4 by dl, Sat Sep 20 18:20:08 2003 UTC vs.
Revision 1.80 by jsr166, Sun May 14 02:03:15 2017 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
2	>	* Written by Doug Lea with assistance from members of JCP JSR-166
3	>	* Expert Group and released to the public domain, as explained at
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9	<	import junit.framework.*;
10	<	import java.util.concurrent.locks.*;
11	<	import java.util.concurrent.*;
12	<	import java.io.*;
9	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
10	>
11	>	import java.util.Arrays;
12	>	import java.util.Collection;
13	>	import java.util.HashSet;
14	>	import java.util.concurrent.CountDownLatch;
15	>	import java.util.concurrent.atomic.AtomicBoolean;
16	>	import java.util.concurrent.locks.Condition;
17	>	import java.util.concurrent.locks.Lock;
18	>	import java.util.concurrent.locks.ReentrantReadWriteLock;
19	>
20	>	import junit.framework.AssertionFailedError;
21	>	import junit.framework.Test;
22	>	import junit.framework.TestSuite;
23
24		public class ReentrantReadWriteLockTest extends JSR166TestCase {
25		public static void main(String[] args) {
26	<	junit.textui.TestRunner.run (suite());
26	>	main(suite(), args);
27		}
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	<	* write-locking and read-locking an unlocked lock succeed
43	>	/**
44	>	* A runnable calling lockInterruptibly that expects to be
45	>	* interrupted
46		*/
47	<	public void testLock() {
48	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
49	<	rl.writeLock().lock();
50	<	rl.writeLock().unlock();
51	<	rl.readLock().lock();
52	<	rl.readLock().unlock();
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	<	* locking an unlocked fair lock succeeds
74	<	*/
75	<	public void testFairLock() {
76	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
77	<	rl.writeLock().lock();
78	<	rl.writeLock().unlock();
79	<	rl.readLock().lock();
80	<	rl.readLock().unlock();
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	<	* write-unlocking an unlocked lock throws IllegalMonitorStateException
84	>	* Spin-waits until lock.hasQueuedThread(t) becomes true.
85		*/
86	<	public void testUnlock_IllegalMonitorStateException() {
87	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
88	<	try {
89	<	rl.writeLock().unlock();
90	<	shouldThrow();
91	<	} catch(IllegalMonitorStateException success){}
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	<	* write-lockInterruptibly is interruptible
110	>	* Checks that lock is write-locked by the given thread.
111		*/
112	<	public void testWriteLockInterruptibly_Interrupted() {
113	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
114	<	lock.writeLock().lock();
115	<	Thread t = new Thread(new Runnable() {
116	<	public void run() {
117	<	try {
118	<	lock.writeLock().lockInterruptibly();
119	<	threadShouldThrow();
120	<	} catch(InterruptedException success){}
121	<	}
122	<	});
123	<	try {
72	<	t.start();
73	<	t.interrupt();
74	<	lock.writeLock().unlock();
75	<	t.join();
76	<	} catch(Exception e){
77	<	unexpectedException();
78	<	}
79	<	}
80	<
81	<	/**
82	<	* timed write-trylock is interruptible
83	<	*/
84	<	public void testWriteTryLock_Interrupted() {
85	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
86	<	lock.writeLock().lock();
87	<	Thread t = new Thread(new Runnable() {
88	<	public void run() {
89	<	try {
90	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
91	<	threadShouldThrow();
92	<	} catch(InterruptedException success){}
93	<	}
94	<	});
95	<	try {
96	<	t.start();
97	<	t.interrupt();
98	<	lock.writeLock().unlock();
99	<	t.join();
100	<	} catch(Exception e){
101	<	unexpectedException();
102	<	}
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	<	* read-lockInterruptibly is interruptible
127	>	* Checks that lock is write-locked by the current thread.
128		*/
129	<	public void testReadLockInterruptibly_Interrupted() {
130	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
131	<	lock.writeLock().lock();
132	<	Thread t = new Thread(new Runnable() {
133	<	public void run() {
134	<	try {
135	<	lock.readLock().lockInterruptibly();
136	<	threadShouldThrow();
137	<	} catch(InterruptedException success){}
138	<	}
139	<	});
140	<	try {
141	<	t.start();
142	<	t.interrupt();
143	<	lock.writeLock().unlock();
144	<	t.join();
145	<	} catch(Exception e){
146	<	unexpectedException();
147	<	}
148	<	}
149	<
150	<	/**
151	<	* timed read-trylock is interruptible
152	<	*/
153	<	public void testReadTryLock_Interrupted() {
154	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
155	<	lock.writeLock().lock();
156	<	Thread t = new Thread(new Runnable() {
157	<	public void run() {
158	<	try {
159	<	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
160	<	threadShouldThrow();
161	<	} catch(InterruptedException success){}
162	<	}
163	<	});
164	<	try {
165	<	t.start();
166	<	t.interrupt();
167	<	t.join();
168	<	} catch(Exception e){
169	<	unexpectedException();
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 > timeoutNanos / 2);
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	<	/**
186	<	* write-trylock fails if locked
187	<	*/
188	<	public void testWriteTryLockWhenLocked() {
189	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
190	<	lock.writeLock().lock();
191	<	Thread t = new Thread(new Runnable() {
192	<	public void run() {
193	<	threadAssertFalse(lock.writeLock().tryLock());
194	<	}
195	<	});
196	<	try {
197	<	t.start();
198	<	t.join();
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	>	final 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	<	} catch(Exception e){
169	<	unexpectedException();
241	>	assertEquals(i - 1,lock.getWriteHoldCount());
242		}
243	<	}
243	>	}
244
245		/**
246	<	* read-trylock fails if locked
246	>	* writelock.getHoldCount returns number of recursive holds
247		*/
248	<	public void testReadTryLockWhenLocked() {
249	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
250	<	lock.writeLock().lock();
251	<	Thread t = new Thread(new Runnable() {
252	<	public void run() {
253	<	threadAssertFalse(lock.readLock().tryLock());
254	<	}
255	<	});
256	<	try {
185	<	t.start();
186	<	t.join();
248	>	public void testGetHoldCount()      { testGetHoldCount(false); }
249	>	public void testGetHoldCount_fair() { testGetHoldCount(true); }
250	>	public void testGetHoldCount(boolean fair) {
251	>	final 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	<	} catch(Exception e){
189	<	unexpectedException();
258	>	assertEquals(i - 1,lock.writeLock().getHoldCount());
259		}
260	<	}
260	>	}
261
262		/**
263	<	* Multiple threads can hold a read lock when not write-locked
263	>	* getReadHoldCount returns number of recursive holds
264		*/
265	<	public void testMultipleReadLocks() {
266	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
267	<	lock.readLock().lock();
268	<	Thread t = new Thread(new Runnable() {
269	<	public void run() {
270	<	threadAssertTrue(lock.readLock().tryLock());
271	<	lock.readLock().unlock();
272	<	}
273	<	});
205	<	try {
206	<	t.start();
207	<	t.join();
265	>	public void testGetReadHoldCount()      { testGetReadHoldCount(false); }
266	>	public void testGetReadHoldCount_fair() { testGetReadHoldCount(true); }
267	>	public void testGetReadHoldCount(boolean fair) {
268	>	final 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	<	} catch(Exception e){
210	<	unexpectedException();
275	>	assertEquals(i - 1,lock.getReadHoldCount());
276		}
277	<	}
277	>	}
278
279		/**
280	<	* A writelock succeeds after reading threads unlock
280	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
281		*/
282	<	public void testWriteAfterMultipleReadLocks() {
283	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
284	<	lock.readLock().lock();
285	<	Thread t1 = new Thread(new Runnable() {
221	<	public void run() {
222	<	lock.readLock().lock();
223	<	lock.readLock().unlock();
224	<	}
225	<	});
226	<	Thread t2 = new Thread(new Runnable() {
227	<	public void run() {
228	<	lock.writeLock().lock();
229	<	lock.writeLock().unlock();
230	<	}
231	<	});
232	<
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	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
286		try {
234	–	t1.start();
235	–	t2.start();
236	–	Thread.sleep(SHORT_DELAY_MS);
237	–	lock.readLock().unlock();
238	–	t1.join(MEDIUM_DELAY_MS);
239	–	t2.join(MEDIUM_DELAY_MS);
240	–	assertTrue(!t1.isAlive());
241	–	assertTrue(!t2.isAlive());
242	–
243	–	} catch(Exception e){
244	–	unexpectedException();
245	–	}
246	–	}
247	–
248	–	/**
249	–	* Readlocks succeed after a writing thread unlocks
250	–	*/
251	–	public void testReadAfterWriteLock() {
252	–	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
253	–	lock.writeLock().lock();
254	–	Thread t1 = new Thread(new Runnable() {
255	–	public void run() {
256	–	lock.readLock().lock();
257	–	lock.readLock().unlock();
258	–	}
259	–	});
260	–	Thread t2 = new Thread(new Runnable() {
261	–	public void run() {
262	–	lock.readLock().lock();
263	–	lock.readLock().unlock();
264	–	}
265	–	});
266	–
267	–	try {
268	–	t1.start();
269	–	t2.start();
270	–	Thread.sleep(SHORT_DELAY_MS);
287		lock.writeLock().unlock();
288	<	t1.join(MEDIUM_DELAY_MS);
289	<	t2.join(MEDIUM_DELAY_MS);
290	<	assertTrue(!t1.isAlive());
275	<	assertTrue(!t2.isAlive());
276	<
277	<	} catch(Exception e){
278	<	unexpectedException();
279	<	}
280	<	}
281	<
288	>	shouldThrow();
289	>	} catch (IllegalMonitorStateException success) {}
290	>	}
291
292		/**
293	<	* Read trylock succeeds if readlocked but not writelocked
294	<	*/
295	<	public void testTryLockWhenReadLocked() {
296	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
297	<	lock.readLock().lock();
298	<	Thread t = new Thread(new Runnable() {
290	<	public void run() {
291	<	threadAssertTrue(lock.readLock().tryLock());
292	<	lock.readLock().unlock();
293	<	}
294	<	});
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	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
299		try {
296	–	t.start();
297	–	t.join();
300		lock.readLock().unlock();
301	<	} catch(Exception e){
302	<	unexpectedException();
303	<	}
302	<	}
303	<
304	<
301	>	shouldThrow();
302	>	} catch (IllegalMonitorStateException success) {}
303	>	}
304
305		/**
306	<	* write trylock fails when readlocked
306	>	* write-lockInterruptibly is interruptible
307		*/
308	<	public void testWriteTryLockWhenReadLocked() {
309	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
310	<	lock.readLock().lock();
311	<	Thread t = new Thread(new Runnable() {
312	<	public void run() {
313	<	threadAssertFalse(lock.writeLock().tryLock());
314	<	}
315	<	});
316	<	try {
317	<	t.start();
318	<	t.join();
319	<	lock.readLock().unlock();
320	<	} catch(Exception e){
321	<	unexpectedException();
322	<	}
323	<	}
325	<
326	<
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	<	* write timed trylock times out if locked
327	<	*/
328	<	public void testWriteTryLock_Timeout() {
329	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
330	<	lock.writeLock().lock();
331	<	Thread t = new Thread(new Runnable() {
332	<	public void run() {
333	<	try {
334	<	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
335	<	} catch (Exception ex) {
336	<	threadUnexpectedException();
337	<	}
338	<	}
339	<	});
340	<	try {
341	<	t.start();
342	<	t.join();
343	<	lock.writeLock().unlock();
347	<	} catch(Exception e){
348	<	unexpectedException();
349	<	}
350	<	}
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 timed trylock times out if write-locked
346	>	* read-lockInterruptibly is interruptible
347		*/
348	<	public void testReadTryLock_Timeout() {
349	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
350	<	lock.writeLock().lock();
351	<	Thread t = new Thread(new Runnable() {
352	<	public void run() {
353	<	try {
354	<	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
355	<	} catch (Exception ex) {
356	<	threadUnexpectedException();
357	<	}
358	<	}
359	<	});
360	<	try {
361	<	t.start();
362	<	t.join();
363	<	lock.writeLock().unlock();
364	<	} catch(Exception e){
365	<	unexpectedException();
366	<	}
367	<	}
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	<	* write lockInterruptibly succeeds if lock free else is interruptible
438	>	* Multiple threads can hold a read lock when not write-locked
439		*/
440	<	public void testWriteLockInterruptibly() {
441	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
442	<	try {
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	>	final long timeoutMillis = timeoutMillis();
792	>	lock.writeLock().lock();
793	>	Thread t = newStartedThread(new CheckedRunnable() {
794	>	public void realRun() throws InterruptedException {
795	>	long startTime = System.nanoTime();
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 = timeoutMillis();
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(Exception e) {
836	<	unexpectedException();
837	<	}
838	<	Thread t = new Thread(new Runnable() {
839	<	public void run() {
840	<	try {
841	<	lock.writeLock().lockInterruptibly();
842	<	threadShouldThrow();
843	<	}
844	<	catch(InterruptedException success) {
845	<	}
395	<	}
396	<	});
397	<	try {
398	<	t.start();
399	<	t.interrupt();
400	<	t.join();
401	<	lock.writeLock().unlock();
402	<	} catch(Exception e){
403	<	unexpectedException();
404	<	}
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
849	>	* read lockInterruptibly succeeds if lock free else is interruptible
850		*/
851	<	public void testReadLockInterruptibly() {
852	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
853	<	try {
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(Exception e) {
861	<	unexpectedException();
862	<	}
863	<	Thread t = new Thread(new Runnable() {
864	<	public void run() {
865	<	try {
866	<	lock.readLock().lockInterruptibly();
867	<	threadShouldThrow();
868	<	}
869	<	catch(InterruptedException success) {
424	<	}
425	<	}
426	<	});
427	<	try {
428	<	t.start();
429	<	t.interrupt();
430	<	t.join();
431	<	lock.writeLock().unlock();
432	<	} catch(Exception e){
433	<	unexpectedException();
434	<	}
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_IllegalMonitor() {
876	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
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	<	try {
881	<	c.await();
882	<	shouldThrow();
883	<	}
884	<	catch (IllegalMonitorStateException success) {
885	<	}
886	<	catch (Exception ex) {
887	<	shouldThrow();
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_IllegalMonitor() {
897	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
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	<	}
464	<	catch (IllegalMonitorStateException success) {
465	<	}
466	<	catch (Exception ex) {
467	<	unexpectedException();
468	<	}
904	>	} catch (IllegalMonitorStateException success) {}
905		}
906
907		/**
908	<	* awaitNanos without a signal times out
908	>	* Calling signalAll without holding lock throws IllegalMonitorStateException
909		*/
910	<	public void testAwaitNanos_Timeout() {
911	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
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	<	lock.writeLock().lock();
917	<	long t = c.awaitNanos(100);
918	<	assertTrue(t <= 0);
481	<	lock.writeLock().unlock();
482	<	}
483	<	catch (Exception ex) {
484	<	unexpectedException();
485	<	}
916	>	c.signalAll();
917	>	shouldThrow();
918	>	} catch (IllegalMonitorStateException success) {}
919		}
920
488	–
921		/**
922	<	*  timed await without a signal times out
922	>	* awaitNanos without a signal times out
923		*/
924	<	public void testAwait_Timeout() {
925	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
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	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
928		final Condition c = lock.writeLock().newCondition();
929	+	final long timeoutMillis = timeoutMillis();
930	+	lock.writeLock().lock();
931	+	final long startTime = System.nanoTime();
932	+	final long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis);
933		try {
934	<	lock.writeLock().lock();
935	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
936	<	lock.writeLock().unlock();
937	<	}
938	<	catch (Exception ex) {
939	<	unexpectedException();
940	<	}
934	>	long nanosRemaining = c.awaitNanos(timeoutNanos);
935	>	assertTrue(nanosRemaining <= 0);
936	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
937	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
938	>	lock.writeLock().unlock();
939	>	}
940	>
941	>	/**
942	>	* timed await without a signal times out
943	>	*/
944	>	public void testAwait_Timeout()      { testAwait_Timeout(false); }
945	>	public void testAwait_Timeout_fair() { testAwait_Timeout(true); }
946	>	public void testAwait_Timeout(boolean fair) {
947	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
948	>	final Condition c = lock.writeLock().newCondition();
949	>	final long timeoutMillis = timeoutMillis();
950	>	lock.writeLock().lock();
951	>	final long startTime = System.nanoTime();
952	>	try {
953	>	assertFalse(c.await(timeoutMillis, MILLISECONDS));
954	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
955	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
956	>	lock.writeLock().unlock();
957		}
958
959		/**
960		* awaitUntil without a signal times out
961		*/
962	<	public void testAwaitUntil_Timeout() {
963	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
962	>	public void testAwaitUntil_Timeout()      { testAwaitUntil_Timeout(false); }
963	>	public void testAwaitUntil_Timeout_fair() { testAwaitUntil_Timeout(true); }
964	>	public void testAwaitUntil_Timeout(boolean fair) {
965	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
966		final Condition c = lock.writeLock().newCondition();
967	<	try {
968	<	lock.writeLock().lock();
969	<	java.util.Date d = new java.util.Date();
970	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
971	<	lock.writeLock().unlock();
972	<	}
973	<	catch (Exception ex) {
974	<	unexpectedException();
975	<	}
967	>	lock.writeLock().lock();
968	>	// We shouldn't assume that nanoTime and currentTimeMillis
969	>	// use the same time source, so don't use nanoTime here.
970	>	final java.util.Date delayedDate = delayedDate(timeoutMillis());
971	>	try {
972	>	assertFalse(c.awaitUntil(delayedDate));
973	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
974	>	assertTrue(new java.util.Date().getTime() >= delayedDate.getTime());
975	>	lock.writeLock().unlock();
976		}
977
978		/**
979		* await returns when signalled
980		*/
981	<	public void testAwait() {
982	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
981	>	public void testAwait()      { testAwait(false); }
982	>	public void testAwait_fair() { testAwait(true); }
983	>	public void testAwait(boolean fair) {
984	>	final PublicReentrantReadWriteLock lock =
985	>	new PublicReentrantReadWriteLock(fair);
986	>	final Condition c = lock.writeLock().newCondition();
987	>	final CountDownLatch locked = new CountDownLatch(1);
988	>	Thread t = newStartedThread(new CheckedRunnable() {
989	>	public void realRun() throws InterruptedException {
990	>	lock.writeLock().lock();
991	>	locked.countDown();
992	>	c.await();
993	>	lock.writeLock().unlock();
994	>	}});
995	>
996	>	await(locked);
997	>	lock.writeLock().lock();
998	>	assertHasWaiters(lock, c, t);
999	>	c.signal();
1000	>	assertHasNoWaiters(lock, c);
1001	>	assertTrue(t.isAlive());
1002	>	lock.writeLock().unlock();
1003	>	awaitTermination(t);
1004	>	}
1005	>
1006	>	/**
1007	>	* awaitUninterruptibly is uninterruptible
1008	>	*/
1009	>	public void testAwaitUninterruptibly()      { testAwaitUninterruptibly(false); }
1010	>	public void testAwaitUninterruptibly_fair() { testAwaitUninterruptibly(true); }
1011	>	public void testAwaitUninterruptibly(boolean fair) {
1012	>	final Lock lock = new ReentrantReadWriteLock(fair).writeLock();
1013	>	final Condition condition = lock.newCondition();
1014	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(2);
1015	>
1016	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1017	>	public void realRun() {
1018	>	// Interrupt before awaitUninterruptibly
1019	>	lock.lock();
1020	>	pleaseInterrupt.countDown();
1021	>	Thread.currentThread().interrupt();
1022	>	condition.awaitUninterruptibly();
1023	>	assertTrue(Thread.interrupted());
1024	>	lock.unlock();
1025	>	}});
1026	>
1027	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1028	>	public void realRun() {
1029	>	// Interrupt during awaitUninterruptibly
1030	>	lock.lock();
1031	>	pleaseInterrupt.countDown();
1032	>	condition.awaitUninterruptibly();
1033	>	assertTrue(Thread.interrupted());
1034	>	lock.unlock();
1035	>	}});
1036	>
1037	>	await(pleaseInterrupt);
1038	>	t2.interrupt();
1039	>	lock.lock();
1040	>	lock.unlock();
1041	>	assertThreadBlocks(t1, Thread.State.WAITING);
1042	>	assertThreadBlocks(t2, Thread.State.WAITING);
1043	>
1044	>	lock.lock();
1045	>	condition.signalAll();
1046	>	lock.unlock();
1047	>
1048	>	awaitTermination(t1);
1049	>	awaitTermination(t2);
1050	>	}
1051	>
1052	>	/**
1053	>	* await/awaitNanos/awaitUntil is interruptible
1054	>	*/
1055	>	public void testInterruptible_await()           { testInterruptible(false, AwaitMethod.await); }
1056	>	public void testInterruptible_await_fair()      { testInterruptible(true,  AwaitMethod.await); }
1057	>	public void testInterruptible_awaitTimed()      { testInterruptible(false, AwaitMethod.awaitTimed); }
1058	>	public void testInterruptible_awaitTimed_fair() { testInterruptible(true,  AwaitMethod.awaitTimed); }
1059	>	public void testInterruptible_awaitNanos()      { testInterruptible(false, AwaitMethod.awaitNanos); }
1060	>	public void testInterruptible_awaitNanos_fair() { testInterruptible(true,  AwaitMethod.awaitNanos); }
1061	>	public void testInterruptible_awaitUntil()      { testInterruptible(false, AwaitMethod.awaitUntil); }
1062	>	public void testInterruptible_awaitUntil_fair() { testInterruptible(true,  AwaitMethod.awaitUntil); }
1063	>	public void testInterruptible(boolean fair, final AwaitMethod awaitMethod) {
1064	>	final PublicReentrantReadWriteLock lock =
1065	>	new PublicReentrantReadWriteLock(fair);
1066		final Condition c = lock.writeLock().newCondition();
1067	<	Thread t = new Thread(new Runnable() {
1068	<	public void run() {
1069	<	try {
1070	<	lock.writeLock().lock();
1071	<	c.await();
1072	<	lock.writeLock().unlock();
1073	<	}
1074	<	catch(InterruptedException e) {
1075	<	threadUnexpectedException();
1076	<	}
1077	<	}
1078	<	});
1067	>	final CountDownLatch locked = new CountDownLatch(1);
1068	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1069	>	public void realRun() throws InterruptedException {
1070	>	lock.writeLock().lock();
1071	>	assertWriteLockedByMoi(lock);
1072	>	assertHasNoWaiters(lock, c);
1073	>	locked.countDown();
1074	>	try {
1075	>	await(c, awaitMethod);
1076	>	} finally {
1077	>	assertWriteLockedByMoi(lock);
1078	>	assertHasNoWaiters(lock, c);
1079	>	lock.writeLock().unlock();
1080	>	assertFalse(Thread.interrupted());
1081	>	}
1082	>	}});
1083	>
1084	>	await(locked);
1085	>	assertHasWaiters(lock, c, t);
1086	>	t.interrupt();
1087	>	awaitTermination(t);
1088	>	assertNotWriteLocked(lock);
1089	>	}
1090
1091	+	/**
1092	+	* signalAll wakes up all threads
1093	+	*/
1094	+	public void testSignalAll_await()           { testSignalAll(false, AwaitMethod.await); }
1095	+	public void testSignalAll_await_fair()      { testSignalAll(true,  AwaitMethod.await); }
1096	+	public void testSignalAll_awaitTimed()      { testSignalAll(false, AwaitMethod.awaitTimed); }
1097	+	public void testSignalAll_awaitTimed_fair() { testSignalAll(true,  AwaitMethod.awaitTimed); }
1098	+	public void testSignalAll_awaitNanos()      { testSignalAll(false, AwaitMethod.awaitNanos); }
1099	+	public void testSignalAll_awaitNanos_fair() { testSignalAll(true,  AwaitMethod.awaitNanos); }
1100	+	public void testSignalAll_awaitUntil()      { testSignalAll(false, AwaitMethod.awaitUntil); }
1101	+	public void testSignalAll_awaitUntil_fair() { testSignalAll(true,  AwaitMethod.awaitUntil); }
1102	+	public void testSignalAll(boolean fair, final AwaitMethod awaitMethod) {
1103	+	final PublicReentrantReadWriteLock lock =
1104	+	new PublicReentrantReadWriteLock(fair);
1105	+	final Condition c = lock.writeLock().newCondition();
1106	+	final CountDownLatch locked = new CountDownLatch(2);
1107	+	final Lock writeLock = lock.writeLock();
1108	+	class Awaiter extends CheckedRunnable {
1109	+	public void realRun() throws InterruptedException {
1110	+	writeLock.lock();
1111	+	locked.countDown();
1112	+	await(c, awaitMethod);
1113	+	writeLock.unlock();
1114	+	}
1115	+	}
1116	+
1117	+	Thread t1 = newStartedThread(new Awaiter());
1118	+	Thread t2 = newStartedThread(new Awaiter());
1119	+
1120	+	await(locked);
1121	+	writeLock.lock();
1122	+	assertHasWaiters(lock, c, t1, t2);
1123	+	c.signalAll();
1124	+	assertHasNoWaiters(lock, c);
1125	+	writeLock.unlock();
1126	+	awaitTermination(t1);
1127	+	awaitTermination(t2);
1128	+	}
1129	+
1130	+	/**
1131	+	* signal wakes up waiting threads in FIFO order
1132	+	*/
1133	+	public void testSignalWakesFifo()      { testSignalWakesFifo(false); }
1134	+	public void testSignalWakesFifo_fair() { testSignalWakesFifo(true); }
1135	+	public void testSignalWakesFifo(boolean fair) {
1136	+	final PublicReentrantReadWriteLock lock =
1137	+	new PublicReentrantReadWriteLock(fair);
1138	+	final Condition c = lock.writeLock().newCondition();
1139	+	final CountDownLatch locked1 = new CountDownLatch(1);
1140	+	final CountDownLatch locked2 = new CountDownLatch(1);
1141	+	final Lock writeLock = lock.writeLock();
1142	+	Thread t1 = newStartedThread(new CheckedRunnable() {
1143	+	public void realRun() throws InterruptedException {
1144	+	writeLock.lock();
1145	+	locked1.countDown();
1146	+	c.await();
1147	+	writeLock.unlock();
1148	+	}});
1149	+
1150	+	await(locked1);
1151	+
1152	+	Thread t2 = newStartedThread(new CheckedRunnable() {
1153	+	public void realRun() throws InterruptedException {
1154	+	writeLock.lock();
1155	+	locked2.countDown();
1156	+	c.await();
1157	+	writeLock.unlock();
1158	+	}});
1159	+
1160	+	await(locked2);
1161	+
1162	+	writeLock.lock();
1163	+	assertHasWaiters(lock, c, t1, t2);
1164	+	assertFalse(lock.hasQueuedThreads());
1165	+	c.signal();
1166	+	assertHasWaiters(lock, c, t2);
1167	+	assertTrue(lock.hasQueuedThread(t1));
1168	+	assertFalse(lock.hasQueuedThread(t2));
1169	+	c.signal();
1170	+	assertHasNoWaiters(lock, c);
1171	+	assertTrue(lock.hasQueuedThread(t1));
1172	+	assertTrue(lock.hasQueuedThread(t2));
1173	+	writeLock.unlock();
1174	+	awaitTermination(t1);
1175	+	awaitTermination(t2);
1176	+	}
1177	+
1178	+	/**
1179	+	* await after multiple reentrant locking preserves lock count
1180	+	*/
1181	+	public void testAwaitLockCount()      { testAwaitLockCount(false); }
1182	+	public void testAwaitLockCount_fair() { testAwaitLockCount(true); }
1183	+	public void testAwaitLockCount(boolean fair) {
1184	+	final PublicReentrantReadWriteLock lock =
1185	+	new PublicReentrantReadWriteLock(fair);
1186	+	final Condition c = lock.writeLock().newCondition();
1187	+	final CountDownLatch locked = new CountDownLatch(2);
1188	+	Thread t1 = newStartedThread(new CheckedRunnable() {
1189	+	public void realRun() throws InterruptedException {
1190	+	lock.writeLock().lock();
1191	+	assertWriteLockedByMoi(lock);
1192	+	assertEquals(1, lock.writeLock().getHoldCount());
1193	+	locked.countDown();
1194	+	c.await();
1195	+	assertWriteLockedByMoi(lock);
1196	+	assertEquals(1, lock.writeLock().getHoldCount());
1197	+	lock.writeLock().unlock();
1198	+	}});
1199	+
1200	+	Thread t2 = newStartedThread(new CheckedRunnable() {
1201	+	public void realRun() throws InterruptedException {
1202	+	lock.writeLock().lock();
1203	+	lock.writeLock().lock();
1204	+	assertWriteLockedByMoi(lock);
1205	+	assertEquals(2, lock.writeLock().getHoldCount());
1206	+	locked.countDown();
1207	+	c.await();
1208	+	assertWriteLockedByMoi(lock);
1209	+	assertEquals(2, lock.writeLock().getHoldCount());
1210	+	lock.writeLock().unlock();
1211	+	lock.writeLock().unlock();
1212	+	}});
1213	+
1214	+	await(locked);
1215	+	lock.writeLock().lock();
1216	+	assertHasWaiters(lock, c, t1, t2);
1217	+	c.signalAll();
1218	+	assertHasNoWaiters(lock, c);
1219	+	lock.writeLock().unlock();
1220	+	awaitTermination(t1);
1221	+	awaitTermination(t2);
1222	+	}
1223	+
1224	+	/**
1225	+	* A serialized lock deserializes as unlocked
1226	+	*/
1227	+	public void testSerialization()      { testSerialization(false); }
1228	+	public void testSerialization_fair() { testSerialization(true); }
1229	+	public void testSerialization(boolean fair) {
1230	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1231	+	lock.writeLock().lock();
1232	+	lock.readLock().lock();
1233	+
1234	+	ReentrantReadWriteLock clone = serialClone(lock);
1235	+	assertEquals(lock.isFair(), clone.isFair());
1236	+	assertTrue(lock.isWriteLocked());
1237	+	assertFalse(clone.isWriteLocked());
1238	+	assertEquals(1, lock.getReadLockCount());
1239	+	assertEquals(0, clone.getReadLockCount());
1240	+	clone.writeLock().lock();
1241	+	clone.readLock().lock();
1242	+	assertTrue(clone.isWriteLocked());
1243	+	assertEquals(1, clone.getReadLockCount());
1244	+	clone.readLock().unlock();
1245	+	clone.writeLock().unlock();
1246	+	assertFalse(clone.isWriteLocked());
1247	+	assertEquals(1, lock.getReadLockCount());
1248	+	assertEquals(0, clone.getReadLockCount());
1249	+	}
1250	+
1251	+	/**
1252	+	* hasQueuedThreads reports whether there are waiting threads
1253	+	*/
1254	+	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
1255	+	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
1256	+	public void testHasQueuedThreads(boolean fair) {
1257	+	final PublicReentrantReadWriteLock lock =
1258	+	new PublicReentrantReadWriteLock(fair);
1259	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1260	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1261	+	assertFalse(lock.hasQueuedThreads());
1262	+	lock.writeLock().lock();
1263	+	assertFalse(lock.hasQueuedThreads());
1264	+	t1.start();
1265	+	waitForQueuedThread(lock, t1);
1266	+	assertTrue(lock.hasQueuedThreads());
1267	+	t2.start();
1268	+	waitForQueuedThread(lock, t2);
1269	+	assertTrue(lock.hasQueuedThreads());
1270	+	t1.interrupt();
1271	+	awaitTermination(t1);
1272	+	assertTrue(lock.hasQueuedThreads());
1273	+	lock.writeLock().unlock();
1274	+	awaitTermination(t2);
1275	+	assertFalse(lock.hasQueuedThreads());
1276	+	}
1277	+
1278	+	/**
1279	+	* hasQueuedThread(null) throws NPE
1280	+	*/
1281	+	public void testHasQueuedThreadNPE()      { testHasQueuedThreadNPE(false); }
1282	+	public void testHasQueuedThreadNPE_fair() { testHasQueuedThreadNPE(true); }
1283	+	public void testHasQueuedThreadNPE(boolean fair) {
1284	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1285		try {
1286	<	t.start();
1287	<	Thread.sleep(SHORT_DELAY_MS);
1288	<	lock.writeLock().lock();
545	<	c.signal();
546	<	lock.writeLock().unlock();
547	<	t.join(SHORT_DELAY_MS);
548	<	assertFalse(t.isAlive());
549	<	}
550	<	catch (Exception ex) {
551	<	unexpectedException();
552	<	}
1286	>	lock.hasQueuedThread(null);
1287	>	shouldThrow();
1288	>	} catch (NullPointerException success) {}
1289		}
1290
1291		/**
1292	<	* awaitUninterruptibly doesn't abort on interrupt
1292	>	* hasQueuedThread reports whether a thread is queued
1293		*/
1294	<	public void testAwaitUninterruptibly() {
1295	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1296	<	final Condition c = lock.writeLock().newCondition();
1297	<	Thread t = new Thread(new Runnable() {
1298	<	public void run() {
1299	<	lock.writeLock().lock();
1300	<	c.awaitUninterruptibly();
1301	<	lock.writeLock().unlock();
1302	<	}
1303	<	});
1294	>	public void testHasQueuedThread()      { testHasQueuedThread(false); }
1295	>	public void testHasQueuedThread_fair() { testHasQueuedThread(true); }
1296	>	public void testHasQueuedThread(boolean fair) {
1297	>	final PublicReentrantReadWriteLock lock =
1298	>	new PublicReentrantReadWriteLock(fair);
1299	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1300	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1301	>	assertFalse(lock.hasQueuedThread(t1));
1302	>	assertFalse(lock.hasQueuedThread(t2));
1303	>	lock.writeLock().lock();
1304	>	t1.start();
1305	>	waitForQueuedThread(lock, t1);
1306	>	assertTrue(lock.hasQueuedThread(t1));
1307	>	assertFalse(lock.hasQueuedThread(t2));
1308	>	t2.start();
1309	>	waitForQueuedThread(lock, t2);
1310	>	assertTrue(lock.hasQueuedThread(t1));
1311	>	assertTrue(lock.hasQueuedThread(t2));
1312	>	t1.interrupt();
1313	>	awaitTermination(t1);
1314	>	assertFalse(lock.hasQueuedThread(t1));
1315	>	assertTrue(lock.hasQueuedThread(t2));
1316	>	lock.writeLock().unlock();
1317	>	awaitTermination(t2);
1318	>	assertFalse(lock.hasQueuedThread(t1));
1319	>	assertFalse(lock.hasQueuedThread(t2));
1320	>	}
1321	>
1322	>	/**
1323	>	* getQueueLength reports number of waiting threads
1324	>	*/
1325	>	public void testGetQueueLength()      { testGetQueueLength(false); }
1326	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
1327	>	public void testGetQueueLength(boolean fair) {
1328	>	final PublicReentrantReadWriteLock lock =
1329	>	new PublicReentrantReadWriteLock(fair);
1330	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1331	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1332	>	assertEquals(0, lock.getQueueLength());
1333	>	lock.writeLock().lock();
1334	>	t1.start();
1335	>	waitForQueuedThread(lock, t1);
1336	>	assertEquals(1, lock.getQueueLength());
1337	>	t2.start();
1338	>	waitForQueuedThread(lock, t2);
1339	>	assertEquals(2, lock.getQueueLength());
1340	>	t1.interrupt();
1341	>	awaitTermination(t1);
1342	>	assertEquals(1, lock.getQueueLength());
1343	>	lock.writeLock().unlock();
1344	>	awaitTermination(t2);
1345	>	assertEquals(0, lock.getQueueLength());
1346	>	}
1347	>
1348	>	/**
1349	>	* getQueuedThreads includes waiting threads
1350	>	*/
1351	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
1352	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
1353	>	public void testGetQueuedThreads(boolean fair) {
1354	>	final PublicReentrantReadWriteLock lock =
1355	>	new PublicReentrantReadWriteLock(fair);
1356	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1357	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1358	>	assertTrue(lock.getQueuedThreads().isEmpty());
1359	>	lock.writeLock().lock();
1360	>	assertTrue(lock.getQueuedThreads().isEmpty());
1361	>	t1.start();
1362	>	waitForQueuedThread(lock, t1);
1363	>	assertEquals(1, lock.getQueuedThreads().size());
1364	>	assertTrue(lock.getQueuedThreads().contains(t1));
1365	>	t2.start();
1366	>	waitForQueuedThread(lock, t2);
1367	>	assertEquals(2, lock.getQueuedThreads().size());
1368	>	assertTrue(lock.getQueuedThreads().contains(t1));
1369	>	assertTrue(lock.getQueuedThreads().contains(t2));
1370	>	t1.interrupt();
1371	>	awaitTermination(t1);
1372	>	assertFalse(lock.getQueuedThreads().contains(t1));
1373	>	assertTrue(lock.getQueuedThreads().contains(t2));
1374	>	assertEquals(1, lock.getQueuedThreads().size());
1375	>	lock.writeLock().unlock();
1376	>	awaitTermination(t2);
1377	>	assertTrue(lock.getQueuedThreads().isEmpty());
1378	>	}
1379	>
1380	>	/**
1381	>	* hasWaiters throws NPE if null
1382	>	*/
1383	>	public void testHasWaitersNPE()      { testHasWaitersNPE(false); }
1384	>	public void testHasWaitersNPE_fair() { testHasWaitersNPE(true); }
1385	>	public void testHasWaitersNPE(boolean fair) {
1386	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1387	>	try {
1388	>	lock.hasWaiters(null);
1389	>	shouldThrow();
1390	>	} catch (NullPointerException success) {}
1391	>	}
1392
1393	+	/**
1394	+	* getWaitQueueLength throws NPE if null
1395	+	*/
1396	+	public void testGetWaitQueueLengthNPE()      { testGetWaitQueueLengthNPE(false); }
1397	+	public void testGetWaitQueueLengthNPE_fair() { testGetWaitQueueLengthNPE(true); }
1398	+	public void testGetWaitQueueLengthNPE(boolean fair) {
1399	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1400		try {
1401	<	t.start();
1402	<	Thread.sleep(SHORT_DELAY_MS);
1403	<	t.interrupt();
573	<	lock.writeLock().lock();
574	<	c.signal();
575	<	lock.writeLock().unlock();
576	<	assert(t.isInterrupted());
577	<	t.join(SHORT_DELAY_MS);
578	<	assertFalse(t.isAlive());
579	<	}
580	<	catch (Exception ex) {
581	<	unexpectedException();
582	<	}
1401	>	lock.getWaitQueueLength(null);
1402	>	shouldThrow();
1403	>	} catch (NullPointerException success) {}
1404		}
1405
1406		/**
1407	<	* await is interruptible
1407	>	* getWaitingThreads throws NPE if null
1408		*/
1409	<	public void testAwait_Interrupt() {
1410	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1411	<	final Condition c = lock.writeLock().newCondition();
1412	<	Thread t = new Thread(new Runnable() {
1413	<	public void run() {
1414	<	try {
1415	<	lock.writeLock().lock();
1416	<	c.await();
1417	<	lock.writeLock().unlock();
597	<	threadShouldThrow();
598	<	}
599	<	catch(InterruptedException success) {
600	<	}
601	<	}
602	<	});
1409	>	public void testGetWaitingThreadsNPE()      { testGetWaitingThreadsNPE(false); }
1410	>	public void testGetWaitingThreadsNPE_fair() { testGetWaitingThreadsNPE(true); }
1411	>	public void testGetWaitingThreadsNPE(boolean fair) {
1412	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(fair);
1413	>	try {
1414	>	lock.getWaitingThreads(null);
1415	>	shouldThrow();
1416	>	} catch (NullPointerException success) {}
1417	>	}
1418
1419	+	/**
1420	+	* hasWaiters throws IllegalArgumentException if not owned
1421	+	*/
1422	+	public void testHasWaitersIAE()      { testHasWaitersIAE(false); }
1423	+	public void testHasWaitersIAE_fair() { testHasWaitersIAE(true); }
1424	+	public void testHasWaitersIAE(boolean fair) {
1425	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1426	+	final Condition c = lock.writeLock().newCondition();
1427	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(fair);
1428		try {
1429	<	t.start();
1430	<	Thread.sleep(SHORT_DELAY_MS);
1431	<	t.interrupt();
608	<	t.join(SHORT_DELAY_MS);
609	<	assertFalse(t.isAlive());
610	<	}
611	<	catch (Exception ex) {
612	<	unexpectedException();
613	<	}
1429	>	lock2.hasWaiters(c);
1430	>	shouldThrow();
1431	>	} catch (IllegalArgumentException success) {}
1432		}
1433
1434		/**
1435	<	* awaitNanos is interruptible
1435	>	* hasWaiters throws IllegalMonitorStateException if not locked
1436		*/
1437	<	public void testAwaitNanos_Interrupt() {
1438	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1437	>	public void testHasWaitersIMSE()      { testHasWaitersIMSE(false); }
1438	>	public void testHasWaitersIMSE_fair() { testHasWaitersIMSE(true); }
1439	>	public void testHasWaitersIMSE(boolean fair) {
1440	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1441		final Condition c = lock.writeLock().newCondition();
1442	<	Thread t = new Thread(new Runnable() {
1443	<	public void run() {
1444	<	try {
1445	<	lock.writeLock().lock();
1446	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
627	<	lock.writeLock().unlock();
628	<	threadShouldThrow();
629	<	}
630	<	catch(InterruptedException success) {
631	<	}
632	<	}
633	<	});
1442	>	try {
1443	>	lock.hasWaiters(c);
1444	>	shouldThrow();
1445	>	} catch (IllegalMonitorStateException success) {}
1446	>	}
1447
1448	+	/**
1449	+	* getWaitQueueLength throws IllegalArgumentException if not owned
1450	+	*/
1451	+	public void testGetWaitQueueLengthIAE()      { testGetWaitQueueLengthIAE(false); }
1452	+	public void testGetWaitQueueLengthIAE_fair() { testGetWaitQueueLengthIAE(true); }
1453	+	public void testGetWaitQueueLengthIAE(boolean fair) {
1454	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1455	+	final Condition c = lock.writeLock().newCondition();
1456	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(fair);
1457		try {
1458	<	t.start();
1459	<	Thread.sleep(SHORT_DELAY_MS);
1460	<	t.interrupt();
639	<	t.join(SHORT_DELAY_MS);
640	<	assertFalse(t.isAlive());
641	<	}
642	<	catch (Exception ex) {
643	<	unexpectedException();
644	<	}
1458	>	lock2.getWaitQueueLength(c);
1459	>	shouldThrow();
1460	>	} catch (IllegalArgumentException success) {}
1461		}
1462
1463		/**
1464	<	* awaitUntil is interruptible
1464	>	* getWaitQueueLength throws IllegalMonitorStateException if not locked
1465		*/
1466	<	public void testAwaitUntil_Interrupt() {
1467	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1466	>	public void testGetWaitQueueLengthIMSE()      { testGetWaitQueueLengthIMSE(false); }
1467	>	public void testGetWaitQueueLengthIMSE_fair() { testGetWaitQueueLengthIMSE(true); }
1468	>	public void testGetWaitQueueLengthIMSE(boolean fair) {
1469	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1470		final Condition c = lock.writeLock().newCondition();
1471	<	Thread t = new Thread(new Runnable() {
1472	<	public void run() {
1473	<	try {
1474	<	lock.writeLock().lock();
1475	<	java.util.Date d = new java.util.Date();
658	<	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
659	<	lock.writeLock().unlock();
660	<	threadShouldThrow();
661	<	}
662	<	catch(InterruptedException success) {
663	<	}
664	<	}
665	<	});
1471	>	try {
1472	>	lock.getWaitQueueLength(c);
1473	>	shouldThrow();
1474	>	} catch (IllegalMonitorStateException success) {}
1475	>	}
1476
1477	+	/**
1478	+	* getWaitingThreads throws IllegalArgumentException if not owned
1479	+	*/
1480	+	public void testGetWaitingThreadsIAE()      { testGetWaitingThreadsIAE(false); }
1481	+	public void testGetWaitingThreadsIAE_fair() { testGetWaitingThreadsIAE(true); }
1482	+	public void testGetWaitingThreadsIAE(boolean fair) {
1483	+	final PublicReentrantReadWriteLock lock =
1484	+	new PublicReentrantReadWriteLock(fair);
1485	+	final Condition c = lock.writeLock().newCondition();
1486	+	final PublicReentrantReadWriteLock lock2 =
1487	+	new PublicReentrantReadWriteLock(fair);
1488		try {
1489	<	t.start();
1490	<	Thread.sleep(SHORT_DELAY_MS);
1491	<	t.interrupt();
671	<	t.join(SHORT_DELAY_MS);
672	<	assertFalse(t.isAlive());
673	<	}
674	<	catch (Exception ex) {
675	<	unexpectedException();
676	<	}
1489	>	lock2.getWaitingThreads(c);
1490	>	shouldThrow();
1491	>	} catch (IllegalArgumentException success) {}
1492		}
1493
1494		/**
1495	<	* signalAll wakes up all threads
1495	>	* getWaitingThreads throws IllegalMonitorStateException if not locked
1496		*/
1497	<	public void testSignalAll() {
1498	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1497	>	public void testGetWaitingThreadsIMSE()      { testGetWaitingThreadsIMSE(false); }
1498	>	public void testGetWaitingThreadsIMSE_fair() { testGetWaitingThreadsIMSE(true); }
1499	>	public void testGetWaitingThreadsIMSE(boolean fair) {
1500	>	final PublicReentrantReadWriteLock lock =
1501	>	new PublicReentrantReadWriteLock(fair);
1502		final Condition c = lock.writeLock().newCondition();
1503	<	Thread t1 = new Thread(new Runnable() {
1504	<	public void run() {
1505	<	try {
1506	<	lock.writeLock().lock();
689	<	c.await();
690	<	lock.writeLock().unlock();
691	<	}
692	<	catch(InterruptedException e) {
693	<	threadUnexpectedException();
694	<	}
695	<	}
696	<	});
697	<
698	<	Thread t2 = new Thread(new Runnable() {
699	<	public void run() {
700	<	try {
701	<	lock.writeLock().lock();
702	<	c.await();
703	<	lock.writeLock().unlock();
704	<	}
705	<	catch(InterruptedException e) {
706	<	threadUnexpectedException();
707	<	}
708	<	}
709	<	});
710	<
711	<	try {
712	<	t1.start();
713	<	t2.start();
714	<	Thread.sleep(SHORT_DELAY_MS);
715	<	lock.writeLock().lock();
716	<	c.signalAll();
717	<	lock.writeLock().unlock();
718	<	t1.join(SHORT_DELAY_MS);
719	<	t2.join(SHORT_DELAY_MS);
720	<	assertFalse(t1.isAlive());
721	<	assertFalse(t2.isAlive());
722	<	}
723	<	catch (Exception ex) {
724	<	unexpectedException();
725	<	}
1503	>	try {
1504	>	lock.getWaitingThreads(c);
1505	>	shouldThrow();
1506	>	} catch (IllegalMonitorStateException success) {}
1507		}
1508
1509		/**
1510	<	* A serialized lock deserializes as unlocked
1510	>	* hasWaiters returns true when a thread is waiting, else false
1511		*/
1512	<	public void testSerialization() {
1513	<	ReentrantReadWriteLock l = new ReentrantReadWriteLock();
1514	<	l.readLock().lock();
1515	<	l.readLock().unlock();
1516	<
1517	<	try {
1518	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1519	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1520	<	out.writeObject(l);
1521	<	out.close();
1522	<
1523	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1524	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1525	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1526	<	r.readLock().lock();
1527	<	r.readLock().unlock();
1528	<	} catch(Exception e){
1529	<	e.printStackTrace();
1530	<	unexpectedException();
1531	<	}
1512	>	public void testHasWaiters()      { testHasWaiters(false); }
1513	>	public void testHasWaiters_fair() { testHasWaiters(true); }
1514	>	public void testHasWaiters(boolean fair) {
1515	>	final PublicReentrantReadWriteLock lock =
1516	>	new PublicReentrantReadWriteLock(fair);
1517	>	final Condition c = lock.writeLock().newCondition();
1518	>	final CountDownLatch locked = new CountDownLatch(1);
1519	>	Thread t = newStartedThread(new CheckedRunnable() {
1520	>	public void realRun() throws InterruptedException {
1521	>	lock.writeLock().lock();
1522	>	assertHasNoWaiters(lock, c);
1523	>	assertFalse(lock.hasWaiters(c));
1524	>	locked.countDown();
1525	>	c.await();
1526	>	assertHasNoWaiters(lock, c);
1527	>	assertFalse(lock.hasWaiters(c));
1528	>	lock.writeLock().unlock();
1529	>	}});
1530	>
1531	>	await(locked);
1532	>	lock.writeLock().lock();
1533	>	assertHasWaiters(lock, c, t);
1534	>	assertTrue(lock.hasWaiters(c));
1535	>	c.signal();
1536	>	assertHasNoWaiters(lock, c);
1537	>	assertFalse(lock.hasWaiters(c));
1538	>	lock.writeLock().unlock();
1539	>	awaitTermination(t);
1540	>	assertHasNoWaiters(lock, c);
1541		}
1542
1543	+	/**
1544	+	* getWaitQueueLength returns number of waiting threads
1545	+	*/
1546	+	public void testGetWaitQueueLength()      { testGetWaitQueueLength(false); }
1547	+	public void testGetWaitQueueLength_fair() { testGetWaitQueueLength(true); }
1548	+	public void testGetWaitQueueLength(boolean fair) {
1549	+	final PublicReentrantReadWriteLock lock =
1550	+	new PublicReentrantReadWriteLock(fair);
1551	+	final Condition c = lock.writeLock().newCondition();
1552	+	final CountDownLatch locked = new CountDownLatch(1);
1553	+	Thread t = newStartedThread(new CheckedRunnable() {
1554	+	public void realRun() throws InterruptedException {
1555	+	lock.writeLock().lock();
1556	+	assertEquals(0, lock.getWaitQueueLength(c));
1557	+	locked.countDown();
1558	+	c.await();
1559	+	lock.writeLock().unlock();
1560	+	}});
1561	+
1562	+	await(locked);
1563	+	lock.writeLock().lock();
1564	+	assertHasWaiters(lock, c, t);
1565	+	assertEquals(1, lock.getWaitQueueLength(c));
1566	+	c.signal();
1567	+	assertHasNoWaiters(lock, c);
1568	+	assertEquals(0, lock.getWaitQueueLength(c));
1569	+	lock.writeLock().unlock();
1570	+	awaitTermination(t);
1571	+	}
1572	+
1573	+	/**
1574	+	* getWaitingThreads returns only and all waiting threads
1575	+	*/
1576	+	public void testGetWaitingThreads()      { testGetWaitingThreads(false); }
1577	+	public void testGetWaitingThreads_fair() { testGetWaitingThreads(true); }
1578	+	public void testGetWaitingThreads(boolean fair) {
1579	+	final PublicReentrantReadWriteLock lock =
1580	+	new PublicReentrantReadWriteLock(fair);
1581	+	final Condition c = lock.writeLock().newCondition();
1582	+	final CountDownLatch locked1 = new CountDownLatch(1);
1583	+	final CountDownLatch locked2 = new CountDownLatch(1);
1584	+	Thread t1 = new Thread(new CheckedRunnable() {
1585	+	public void realRun() throws InterruptedException {
1586	+	lock.writeLock().lock();
1587	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1588	+	locked1.countDown();
1589	+	c.await();
1590	+	lock.writeLock().unlock();
1591	+	}});
1592	+
1593	+	Thread t2 = new Thread(new CheckedRunnable() {
1594	+	public void realRun() throws InterruptedException {
1595	+	lock.writeLock().lock();
1596	+	assertFalse(lock.getWaitingThreads(c).isEmpty());
1597	+	locked2.countDown();
1598	+	c.await();
1599	+	lock.writeLock().unlock();
1600	+	}});
1601	+
1602	+	lock.writeLock().lock();
1603	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1604	+	lock.writeLock().unlock();
1605	+
1606	+	t1.start();
1607	+	await(locked1);
1608	+	t2.start();
1609	+	await(locked2);
1610	+
1611	+	lock.writeLock().lock();
1612	+	assertTrue(lock.hasWaiters(c));
1613	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1614	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1615	+	assertEquals(2, lock.getWaitingThreads(c).size());
1616	+	c.signalAll();
1617	+	assertHasNoWaiters(lock, c);
1618	+	lock.writeLock().unlock();
1619	+
1620	+	awaitTermination(t1);
1621	+	awaitTermination(t2);
1622	+
1623	+	assertHasNoWaiters(lock, c);
1624	+	}
1625	+
1626	+	/**
1627	+	* toString indicates current lock state
1628	+	*/
1629	+	public void testToString()      { testToString(false); }
1630	+	public void testToString_fair() { testToString(true); }
1631	+	public void testToString(boolean fair) {
1632	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1633	+	assertTrue(lock.toString().contains("Write locks = 0"));
1634	+	assertTrue(lock.toString().contains("Read locks = 0"));
1635	+	lock.writeLock().lock();
1636	+	assertTrue(lock.toString().contains("Write locks = 1"));
1637	+	assertTrue(lock.toString().contains("Read locks = 0"));
1638	+	lock.writeLock().lock();
1639	+	assertTrue(lock.toString().contains("Write locks = 2"));
1640	+	assertTrue(lock.toString().contains("Read locks = 0"));
1641	+	lock.writeLock().unlock();
1642	+	lock.writeLock().unlock();
1643	+	lock.readLock().lock();
1644	+	assertTrue(lock.toString().contains("Write locks = 0"));
1645	+	assertTrue(lock.toString().contains("Read locks = 1"));
1646	+	lock.readLock().lock();
1647	+	assertTrue(lock.toString().contains("Write locks = 0"));
1648	+	assertTrue(lock.toString().contains("Read locks = 2"));
1649	+	}
1650	+
1651	+	/**
1652	+	* readLock.toString indicates current lock state
1653	+	*/
1654	+	public void testReadLockToString()      { testReadLockToString(false); }
1655	+	public void testReadLockToString_fair() { testReadLockToString(true); }
1656	+	public void testReadLockToString(boolean fair) {
1657	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1658	+	assertTrue(lock.readLock().toString().contains("Read locks = 0"));
1659	+	lock.readLock().lock();
1660	+	assertTrue(lock.readLock().toString().contains("Read locks = 1"));
1661	+	lock.readLock().lock();
1662	+	assertTrue(lock.readLock().toString().contains("Read locks = 2"));
1663	+	lock.readLock().unlock();
1664	+	assertTrue(lock.readLock().toString().contains("Read locks = 1"));
1665	+	lock.readLock().unlock();
1666	+	assertTrue(lock.readLock().toString().contains("Read locks = 0"));
1667	+	}
1668	+
1669	+	/**
1670	+	* writeLock.toString indicates current lock state
1671	+	*/
1672	+	public void testWriteLockToString()      { testWriteLockToString(false); }
1673	+	public void testWriteLockToString_fair() { testWriteLockToString(true); }
1674	+	public void testWriteLockToString(boolean fair) {
1675	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1676	+	assertTrue(lock.writeLock().toString().contains("Unlocked"));
1677	+	lock.writeLock().lock();
1678	+	assertTrue(lock.writeLock().toString().contains("Locked by"));
1679	+	lock.writeLock().unlock();
1680	+	assertTrue(lock.writeLock().toString().contains("Unlocked"));
1681	+	}
1682
1683		}

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