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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 1.36 by jsr166, Sat Nov 21 02:33:20 2009 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/licenses/publicdomain
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 static java.util.concurrent.TimeUnit.MILLISECONDS;
13		import java.io.*;
14	+	import java.util.*;
15
16		public class ReentrantReadWriteLockTest extends JSR166TestCase {
17		public static void main(String[] args) {
18	<	junit.textui.TestRunner.run (suite());
18	>	junit.textui.TestRunner.run (suite());
19		}
20		public static Test suite() {
21	<	return new TestSuite(ReentrantReadWriteLockTest.class);
21	>	return new TestSuite(ReentrantReadWriteLockTest.class);
22		}
23
24	+	/**
25	+	* A runnable calling lockInterruptibly
26	+	*/
27	+	class InterruptibleLockRunnable extends CheckedRunnable {
28	+	final ReentrantReadWriteLock lock;
29	+	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
30	+	public void realRun() throws InterruptedException {
31	+	lock.writeLock().lockInterruptibly();
32	+	}
33	+	}
34	+
35	+
36	+	/**
37	+	* A runnable calling lockInterruptibly that expects to be
38	+	* interrupted
39	+	*/
40	+	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
41	+	final ReentrantReadWriteLock lock;
42	+	InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
43	+	public void realRun() throws InterruptedException {
44	+	lock.writeLock().lockInterruptibly();
45	+	}
46	+	}
47	+
48	+	/**
49	+	* Subclass to expose protected methods
50	+	*/
51	+	static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
52	+	PublicReentrantReadWriteLock() { super(); }
53	+	public Collection<Thread> getQueuedThreads() {
54	+	return super.getQueuedThreads();
55	+	}
56	+	public Collection<Thread> getWaitingThreads(Condition c) {
57	+	return super.getWaitingThreads(c);
58	+	}
59	+	}
60
61	<	/*
61	>	/**
62	>	* Constructor sets given fairness, and is in unlocked state
63	>	*/
64	>	public void testConstructor() {
65	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
66	>	assertFalse(rl.isFair());
67	>	assertFalse(rl.isWriteLocked());
68	>	assertEquals(0, rl.getReadLockCount());
69	>	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
70	>	assertTrue(r2.isFair());
71	>	assertFalse(r2.isWriteLocked());
72	>	assertEquals(0, r2.getReadLockCount());
73	>	ReentrantReadWriteLock r3 = new ReentrantReadWriteLock(false);
74	>	assertFalse(r3.isFair());
75	>	assertFalse(r3.isWriteLocked());
76	>	assertEquals(0, r3.getReadLockCount());
77	>	}
78	>
79	>	/**
80		* write-locking and read-locking an unlocked lock succeed
81		*/
82	<	public void testLock() {
83	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
82	>	public void testLock() {
83	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
84		rl.writeLock().lock();
85	+	assertTrue(rl.isWriteLocked());
86	+	assertTrue(rl.isWriteLockedByCurrentThread());
87	+	assertTrue(rl.writeLock().isHeldByCurrentThread());
88	+	assertEquals(0, rl.getReadLockCount());
89		rl.writeLock().unlock();
90	+	assertFalse(rl.isWriteLocked());
91	+	assertFalse(rl.isWriteLockedByCurrentThread());
92	+	assertFalse(rl.writeLock().isHeldByCurrentThread());
93	+	assertEquals(0, rl.getReadLockCount());
94		rl.readLock().lock();
95	+	assertFalse(rl.isWriteLocked());
96	+	assertFalse(rl.isWriteLockedByCurrentThread());
97	+	assertEquals(1, rl.getReadLockCount());
98		rl.readLock().unlock();
99	+	assertFalse(rl.isWriteLocked());
100	+	assertFalse(rl.isWriteLockedByCurrentThread());
101	+	assertEquals(0, rl.getReadLockCount());
102		}
103
104
105	<	/*
105	>	/**
106		* locking an unlocked fair lock succeeds
107		*/
108	<	public void testFairLock() {
109	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
108	>	public void testFairLock() {
109	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
110		rl.writeLock().lock();
111	+	assertTrue(rl.isWriteLocked());
112	+	assertTrue(rl.isWriteLockedByCurrentThread());
113	+	assertTrue(rl.writeLock().isHeldByCurrentThread());
114	+	assertEquals(0, rl.getReadLockCount());
115		rl.writeLock().unlock();
116	+	assertFalse(rl.isWriteLocked());
117	+	assertFalse(rl.isWriteLockedByCurrentThread());
118	+	assertFalse(rl.writeLock().isHeldByCurrentThread());
119	+	assertEquals(0, rl.getReadLockCount());
120		rl.readLock().lock();
121	+	assertFalse(rl.isWriteLocked());
122	+	assertFalse(rl.isWriteLockedByCurrentThread());
123	+	assertEquals(1, rl.getReadLockCount());
124		rl.readLock().unlock();
125	+	assertFalse(rl.isWriteLocked());
126	+	assertFalse(rl.isWriteLockedByCurrentThread());
127	+	assertEquals(0, rl.getReadLockCount());
128		}
129
130		/**
131	<	* write-unlocking an unlocked lock throws IllegalMonitorStateException
131	>	* getWriteHoldCount returns number of recursive holds
132		*/
133	<	public void testUnlock_IllegalMonitorStateException() {
134	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
135	<	try {
136	<	rl.writeLock().unlock();
137	<	shouldThrow();
138	<	} catch(IllegalMonitorStateException success){}
133	>	public void testGetWriteHoldCount() {
134	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
135	>	for (int i = 1; i <= SIZE; i++) {
136	>	lock.writeLock().lock();
137	>	assertEquals(i,lock.getWriteHoldCount());
138	>	}
139	>	for (int i = SIZE; i > 0; i--) {
140	>	lock.writeLock().unlock();
141	>	assertEquals(i-1,lock.getWriteHoldCount());
142	>	}
143		}
144
56	–
145		/**
146	<	* write-lockInterruptibly is interruptible
146	>	* WriteLock.getHoldCount returns number of recursive holds
147		*/
148	<	public void testWriteLockInterruptibly_Interrupted() {
149	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
150	<	lock.writeLock().lock();
151	<	Thread t = new Thread(new Runnable() {
152	<	public void run() {
153	<	try {
154	<	lock.writeLock().lockInterruptibly();
67	<	threadShouldThrow();
68	<	} catch(InterruptedException success){}
69	<	}
70	<	});
71	<	try {
72	<	t.start();
73	<	t.interrupt();
148	>	public void testGetHoldCount() {
149	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
150	>	for (int i = 1; i <= SIZE; i++) {
151	>	lock.writeLock().lock();
152	>	assertEquals(i,lock.writeLock().getHoldCount());
153	>	}
154	>	for (int i = SIZE; i > 0; i--) {
155		lock.writeLock().unlock();
156	<	t.join();
76	<	} catch(Exception e){
77	<	unexpectedException();
156	>	assertEquals(i-1,lock.writeLock().getHoldCount());
157		}
158	<	}
158	>	}
159
160		/**
161	<	* timed write-trylock is interruptible
161	>	* getReadHoldCount returns number of recursive holds
162		*/
163	<	public void testWriteTryLock_Interrupted() {
164	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
165	<	lock.writeLock().lock();
166	<	Thread t = new Thread(new Runnable() {
167	<	public void run() {
168	<	try {
169	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
170	<	threadShouldThrow();
171	<	} 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();
163	>	public void testGetReadHoldCount() {
164	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
165	>	for (int i = 1; i <= SIZE; i++) {
166	>	lock.readLock().lock();
167	>	assertEquals(i,lock.getReadHoldCount());
168	>	}
169	>	for (int i = SIZE; i > 0; i--) {
170	>	lock.readLock().unlock();
171	>	assertEquals(i-1,lock.getReadHoldCount());
172		}
173		}
174
175	+
176		/**
177	<	* read-lockInterruptibly is interruptible
177	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
178		*/
179	<	public void testReadLockInterruptibly_Interrupted() {
180	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
110	<	lock.writeLock().lock();
111	<	Thread t = new Thread(new Runnable() {
112	<	public void run() {
113	<	try {
114	<	lock.readLock().lockInterruptibly();
115	<	threadShouldThrow();
116	<	} catch(InterruptedException success){}
117	<	}
118	<	});
179	>	public void testUnlock_IllegalMonitorStateException() {
180	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
181		try {
182	<	t.start();
183	<	t.interrupt();
184	<	lock.writeLock().unlock();
185	<	t.join();
186	<	} catch(Exception e){
125	<	unexpectedException();
126	<	}
127	<	}
182	>	rl.writeLock().unlock();
183	>	shouldThrow();
184	>	} catch (IllegalMonitorStateException success) {}
185	>	}
186	>
187
188		/**
189	<	* timed read-trylock is interruptible
189	>	* write-lockInterruptibly is interruptible
190		*/
191	<	public void testReadTryLock_Interrupted() {
192	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
193	<	lock.writeLock().lock();
194	<	Thread t = new Thread(new Runnable() {
195	<	public void run() {
196	<	try {
197	<	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
198	<	threadShouldThrow();
199	<	} catch(InterruptedException success){}
200	<	}
201	<	});
202	<	try {
203	<	t.start();
204	<	t.interrupt();
205	<	t.join();
206	<	} catch(Exception e){
207	<	unexpectedException();
208	<	}
191	>	public void testWriteLockInterruptibly_Interrupted() throws Exception {
192	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
193	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
194	>	public void realRun() throws InterruptedException {
195	>	lock.writeLock().lockInterruptibly();
196	>	lock.writeLock().unlock();
197	>	lock.writeLock().lockInterruptibly();
198	>	lock.writeLock().unlock();
199	>	}});
200	>
201	>	lock.writeLock().lock();
202	>	t.start();
203	>	Thread.sleep(SHORT_DELAY_MS);
204	>	t.interrupt();
205	>	Thread.sleep(SHORT_DELAY_MS);
206	>	lock.writeLock().unlock();
207	>	t.join();
208	>	}
209	>
210	>	/**
211	>	* timed write-tryLock is interruptible
212	>	*/
213	>	public void testWriteTryLock_Interrupted() throws InterruptedException {
214	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
215	>	lock.writeLock().lock();
216	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
217	>	public void realRun() throws InterruptedException {
218	>	lock.writeLock().tryLock(1000,MILLISECONDS);
219	>	}});
220	>
221	>	t.start();
222	>	t.interrupt();
223	>	lock.writeLock().unlock();
224	>	t.join();
225	>	}
226	>
227	>	/**
228	>	* read-lockInterruptibly is interruptible
229	>	*/
230	>	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
231	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
232	>	lock.writeLock().lock();
233	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
234	>	public void realRun() throws InterruptedException {
235	>	lock.readLock().lockInterruptibly();
236	>	}});
237	>
238	>	t.start();
239	>	Thread.sleep(SHORT_DELAY_MS);
240	>	t.interrupt();
241	>	Thread.sleep(SHORT_DELAY_MS);
242	>	lock.writeLock().unlock();
243	>	t.join();
244		}
245
152	–
246		/**
247	<	* write-trylock fails if locked
247	>	* timed read-tryLock is interruptible
248		*/
249	<	public void testWriteTryLockWhenLocked() {
250	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
251	<	lock.writeLock().lock();
252	<	Thread t = new Thread(new Runnable() {
249	>	public void testReadTryLock_Interrupted() throws InterruptedException {
250	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
251	>	lock.writeLock().lock();
252	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
253	>	public void realRun() throws InterruptedException {
254	>	lock.readLock().tryLock(1000,MILLISECONDS);
255	>	}});
256	>
257	>	t.start();
258	>	t.interrupt();
259	>	t.join();
260	>	}
261	>
262	>
263	>	/**
264	>	* write-tryLock fails if locked
265	>	*/
266	>	public void testWriteTryLockWhenLocked() throws InterruptedException {
267	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
268	>	lock.writeLock().lock();
269	>	Thread t = new Thread(new Runnable() {
270		public void run() {
271		threadAssertFalse(lock.writeLock().tryLock());
272	<	}
273	<	});
274	<	try {
275	<	t.start();
276	<	t.join();
277	<	lock.writeLock().unlock();
278	<	} catch(Exception e){
169	<	unexpectedException();
170	<	}
171	<	}
272	>	}
273	>	});
274	>
275	>	t.start();
276	>	t.join();
277	>	lock.writeLock().unlock();
278	>	}
279
280		/**
281	<	* read-trylock fails if locked
281	>	* read-tryLock fails if locked
282		*/
283	<	public void testReadTryLockWhenLocked() {
284	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
285	<	lock.writeLock().lock();
286	<	Thread t = new Thread(new Runnable() {
283	>	public void testReadTryLockWhenLocked() throws InterruptedException {
284	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
285	>	lock.writeLock().lock();
286	>	Thread t = new Thread(new Runnable() {
287		public void run() {
288		threadAssertFalse(lock.readLock().tryLock());
289	<	}
290	<	});
291	<	try {
292	<	t.start();
293	<	t.join();
294	<	lock.writeLock().unlock();
295	<	} catch(Exception e){
189	<	unexpectedException();
190	<	}
191	<	}
289	>	}
290	>	});
291	>
292	>	t.start();
293	>	t.join();
294	>	lock.writeLock().unlock();
295	>	}
296
297		/**
298		* Multiple threads can hold a read lock when not write-locked
299		*/
300	<	public void testMultipleReadLocks() {
301	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
302	<	lock.readLock().lock();
303	<	Thread t = new Thread(new Runnable() {
300	>	public void testMultipleReadLocks() throws InterruptedException {
301	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
302	>	lock.readLock().lock();
303	>	Thread t = new Thread(new Runnable() {
304		public void run() {
305		threadAssertTrue(lock.readLock().tryLock());
306		lock.readLock().unlock();
307	<	}
308	<	});
309	<	try {
310	<	t.start();
311	<	t.join();
312	<	lock.readLock().unlock();
313	<	} catch(Exception e){
210	<	unexpectedException();
211	<	}
212	<	}
307	>	}
308	>	});
309	>
310	>	t.start();
311	>	t.join();
312	>	lock.readLock().unlock();
313	>	}
314
315		/**
316		* A writelock succeeds after reading threads unlock
317		*/
318	<	public void testWriteAfterMultipleReadLocks() {
319	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
320	<	lock.readLock().lock();
321	<	Thread t1 = new Thread(new Runnable() {
318	>	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
319	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
320	>	lock.readLock().lock();
321	>	Thread t1 = new Thread(new Runnable() {
322		public void run() {
323		lock.readLock().lock();
324		lock.readLock().unlock();
325	<	}
326	<	});
327	<	Thread t2 = new Thread(new Runnable() {
325	>	}
326	>	});
327	>	Thread t2 = new Thread(new Runnable() {
328		public void run() {
329		lock.writeLock().lock();
330		lock.writeLock().unlock();
331	<	}
332	<	});
331	>	}
332	>	});
333
334	<	try {
335	<	t1.start();
336	<	t2.start();
337	<	Thread.sleep(SHORT_DELAY_MS);
338	<	lock.readLock().unlock();
339	<	t1.join(MEDIUM_DELAY_MS);
340	<	t2.join(MEDIUM_DELAY_MS);
341	<	assertTrue(!t1.isAlive());
342	<	assertTrue(!t2.isAlive());
242	<
243	<	} catch(Exception e){
244	<	unexpectedException();
245	<	}
246	<	}
334	>	t1.start();
335	>	t2.start();
336	>	Thread.sleep(SHORT_DELAY_MS);
337	>	lock.readLock().unlock();
338	>	t1.join(MEDIUM_DELAY_MS);
339	>	t2.join(MEDIUM_DELAY_MS);
340	>	assertTrue(!t1.isAlive());
341	>	assertTrue(!t2.isAlive());
342	>	}
343
344		/**
345		* Readlocks succeed after a writing thread unlocks
346		*/
347	<	public void testReadAfterWriteLock() {
348	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
349	<	lock.writeLock().lock();
350	<	Thread t1 = new Thread(new Runnable() {
347	>	public void testReadAfterWriteLock() throws InterruptedException {
348	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
349	>	lock.writeLock().lock();
350	>	Thread t1 = new Thread(new Runnable() {
351		public void run() {
352		lock.readLock().lock();
353		lock.readLock().unlock();
354	<	}
355	<	});
356	<	Thread t2 = new Thread(new Runnable() {
354	>	}
355	>	});
356	>	Thread t2 = new Thread(new Runnable() {
357		public void run() {
358		lock.readLock().lock();
359		lock.readLock().unlock();
360	<	}
361	<	});
360	>	}
361	>	});
362
363	<	try {
364	<	t1.start();
365	<	t2.start();
366	<	Thread.sleep(SHORT_DELAY_MS);
367	<	lock.writeLock().unlock();
368	<	t1.join(MEDIUM_DELAY_MS);
369	<	t2.join(MEDIUM_DELAY_MS);
370	<	assertTrue(!t1.isAlive());
371	<	assertTrue(!t2.isAlive());
276	<
277	<	} catch(Exception e){
278	<	unexpectedException();
279	<	}
280	<	}
363	>	t1.start();
364	>	t2.start();
365	>	Thread.sleep(SHORT_DELAY_MS);
366	>	lock.writeLock().unlock();
367	>	t1.join(MEDIUM_DELAY_MS);
368	>	t2.join(MEDIUM_DELAY_MS);
369	>	assertTrue(!t1.isAlive());
370	>	assertTrue(!t2.isAlive());
371	>	}
372
373	+	/**
374	+	* Read trylock succeeds if write locked by current thread
375	+	*/
376	+	public void testReadHoldingWriteLock() {
377	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
378	+	lock.writeLock().lock();
379	+	assertTrue(lock.readLock().tryLock());
380	+	lock.readLock().unlock();
381	+	lock.writeLock().unlock();
382	+	}
383
384		/**
385	<	* Read trylock succeeds if readlocked but not writelocked
385	>	* Read lock succeeds if write locked by current thread even if
386	>	* other threads are waiting for readlock
387		*/
388	<	public void testTryLockWhenReadLocked() {
389	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
390	<	lock.readLock().lock();
391	<	Thread t = new Thread(new Runnable() {
388	>	public void testReadHoldingWriteLock2() throws InterruptedException {
389	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
390	>	lock.writeLock().lock();
391	>	Thread t1 = new Thread(new Runnable() {
392	>	public void run() {
393	>	lock.readLock().lock();
394	>	lock.readLock().unlock();
395	>	}
396	>	});
397	>	Thread t2 = new Thread(new Runnable() {
398	>	public void run() {
399	>	lock.readLock().lock();
400	>	lock.readLock().unlock();
401	>	}
402	>	});
403	>
404	>	t1.start();
405	>	t2.start();
406	>	lock.readLock().lock();
407	>	lock.readLock().unlock();
408	>	Thread.sleep(SHORT_DELAY_MS);
409	>	lock.readLock().lock();
410	>	lock.readLock().unlock();
411	>	lock.writeLock().unlock();
412	>	t1.join(MEDIUM_DELAY_MS);
413	>	t2.join(MEDIUM_DELAY_MS);
414	>	assertTrue(!t1.isAlive());
415	>	assertTrue(!t2.isAlive());
416	>	}
417	>
418	>	/**
419	>	*  Read lock succeeds if write locked by current thread even if
420	>	* other threads are waiting for writelock
421	>	*/
422	>	public void testReadHoldingWriteLock3() throws InterruptedException {
423	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
424	>	lock.writeLock().lock();
425	>	Thread t1 = new Thread(new Runnable() {
426	>	public void run() {
427	>	lock.writeLock().lock();
428	>	lock.writeLock().unlock();
429	>	}
430	>	});
431	>	Thread t2 = new Thread(new Runnable() {
432	>	public void run() {
433	>	lock.writeLock().lock();
434	>	lock.writeLock().unlock();
435	>	}
436	>	});
437	>
438	>	t1.start();
439	>	t2.start();
440	>	lock.readLock().lock();
441	>	lock.readLock().unlock();
442	>	Thread.sleep(SHORT_DELAY_MS);
443	>	lock.readLock().lock();
444	>	lock.readLock().unlock();
445	>	lock.writeLock().unlock();
446	>	t1.join(MEDIUM_DELAY_MS);
447	>	t2.join(MEDIUM_DELAY_MS);
448	>	assertTrue(!t1.isAlive());
449	>	assertTrue(!t2.isAlive());
450	>	}
451	>
452	>
453	>	/**
454	>	*  Write lock succeeds if write locked by current thread even if
455	>	* other threads are waiting for writelock
456	>	*/
457	>	public void testWriteHoldingWriteLock4() throws InterruptedException {
458	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
459	>	lock.writeLock().lock();
460	>	Thread t1 = new Thread(new Runnable() {
461	>	public void run() {
462	>	lock.writeLock().lock();
463	>	lock.writeLock().unlock();
464	>	}
465	>	});
466	>	Thread t2 = new Thread(new Runnable() {
467	>	public void run() {
468	>	lock.writeLock().lock();
469	>	lock.writeLock().unlock();
470	>	}
471	>	});
472	>
473	>	t1.start();
474	>	t2.start();
475	>	lock.writeLock().lock();
476	>	lock.writeLock().unlock();
477	>	Thread.sleep(SHORT_DELAY_MS);
478	>	lock.writeLock().lock();
479	>	lock.writeLock().unlock();
480	>	lock.writeLock().unlock();
481	>	t1.join(MEDIUM_DELAY_MS);
482	>	t2.join(MEDIUM_DELAY_MS);
483	>	assertTrue(!t1.isAlive());
484	>	assertTrue(!t2.isAlive());
485	>	}
486	>
487	>
488	>	/**
489	>	* Fair Read trylock succeeds if write locked by current thread
490	>	*/
491	>	public void testReadHoldingWriteLockFair() {
492	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
493	>	lock.writeLock().lock();
494	>	assertTrue(lock.readLock().tryLock());
495	>	lock.readLock().unlock();
496	>	lock.writeLock().unlock();
497	>	}
498	>
499	>	/**
500	>	* Fair Read lock succeeds if write locked by current thread even if
501	>	* other threads are waiting for readlock
502	>	*/
503	>	public void testReadHoldingWriteLockFair2() throws InterruptedException {
504	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
505	>	lock.writeLock().lock();
506	>	Thread t1 = new Thread(new Runnable() {
507	>	public void run() {
508	>	lock.readLock().lock();
509	>	lock.readLock().unlock();
510	>	}
511	>	});
512	>	Thread t2 = new Thread(new Runnable() {
513	>	public void run() {
514	>	lock.readLock().lock();
515	>	lock.readLock().unlock();
516	>	}
517	>	});
518	>
519	>	t1.start();
520	>	t2.start();
521	>	lock.readLock().lock();
522	>	lock.readLock().unlock();
523	>	Thread.sleep(SHORT_DELAY_MS);
524	>	lock.readLock().lock();
525	>	lock.readLock().unlock();
526	>	lock.writeLock().unlock();
527	>	t1.join(MEDIUM_DELAY_MS);
528	>	t2.join(MEDIUM_DELAY_MS);
529	>	assertTrue(!t1.isAlive());
530	>	assertTrue(!t2.isAlive());
531	>	}
532	>
533	>
534	>	/**
535	>	* Fair Read lock succeeds if write locked by current thread even if
536	>	* other threads are waiting for writelock
537	>	*/
538	>	public void testReadHoldingWriteLockFair3() throws InterruptedException {
539	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
540	>	lock.writeLock().lock();
541	>	Thread t1 = new Thread(new Runnable() {
542	>	public void run() {
543	>	lock.writeLock().lock();
544	>	lock.writeLock().unlock();
545	>	}
546	>	});
547	>	Thread t2 = new Thread(new Runnable() {
548	>	public void run() {
549	>	lock.writeLock().lock();
550	>	lock.writeLock().unlock();
551	>	}
552	>	});
553	>
554	>	t1.start();
555	>	t2.start();
556	>	lock.readLock().lock();
557	>	lock.readLock().unlock();
558	>	Thread.sleep(SHORT_DELAY_MS);
559	>	lock.readLock().lock();
560	>	lock.readLock().unlock();
561	>	lock.writeLock().unlock();
562	>	t1.join(MEDIUM_DELAY_MS);
563	>	t2.join(MEDIUM_DELAY_MS);
564	>	assertTrue(!t1.isAlive());
565	>	assertTrue(!t2.isAlive());
566	>	}
567	>
568	>
569	>	/**
570	>	* Fair Write lock succeeds if write locked by current thread even if
571	>	* other threads are waiting for writelock
572	>	*/
573	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
574	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
575	>	lock.writeLock().lock();
576	>	Thread t1 = new Thread(new Runnable() {
577	>	public void run() {
578	>	lock.writeLock().lock();
579	>	lock.writeLock().unlock();
580	>	}
581	>	});
582	>	Thread t2 = new Thread(new Runnable() {
583	>	public void run() {
584	>	lock.writeLock().lock();
585	>	lock.writeLock().unlock();
586	>	}
587	>	});
588	>
589	>	t1.start();
590	>	t2.start();
591	>	Thread.sleep(SHORT_DELAY_MS);
592	>	assertTrue(lock.isWriteLockedByCurrentThread());
593	>	assertTrue(lock.getWriteHoldCount() == 1);
594	>	lock.writeLock().lock();
595	>	assertTrue(lock.getWriteHoldCount() == 2);
596	>	lock.writeLock().unlock();
597	>	lock.writeLock().lock();
598	>	lock.writeLock().unlock();
599	>	lock.writeLock().unlock();
600	>	t1.join(MEDIUM_DELAY_MS);
601	>	t2.join(MEDIUM_DELAY_MS);
602	>	assertTrue(!t1.isAlive());
603	>	assertTrue(!t2.isAlive());
604	>	}
605	>
606	>
607	>	/**
608	>	* Read tryLock succeeds if readlocked but not writelocked
609	>	*/
610	>	public void testTryLockWhenReadLocked() throws InterruptedException {
611	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
612	>	lock.readLock().lock();
613	>	Thread t = new Thread(new Runnable() {
614		public void run() {
615		threadAssertTrue(lock.readLock().tryLock());
616		lock.readLock().unlock();
617	<	}
618	<	});
619	<	try {
620	<	t.start();
621	<	t.join();
622	<	lock.readLock().unlock();
623	<	} catch(Exception e){
624	<	unexpectedException();
301	<	}
302	<	}
617	>	}
618	>	});
619	>
620	>	t.start();
621	>	t.join();
622	>	lock.readLock().unlock();
623	>	}
624	>
625
304	–
626
627		/**
628	<	* write trylock fails when readlocked
628	>	* write tryLock fails when readlocked
629		*/
630	<	public void testWriteTryLockWhenReadLocked() {
631	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
632	<	lock.readLock().lock();
633	<	Thread t = new Thread(new Runnable() {
630	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
631	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
632	>	lock.readLock().lock();
633	>	Thread t = new Thread(new Runnable() {
634		public void run() {
635		threadAssertFalse(lock.writeLock().tryLock());
636	<	}
637	<	});
638	<	try {
639	<	t.start();
640	<	t.join();
641	<	lock.readLock().unlock();
642	<	} catch(Exception e){
322	<	unexpectedException();
323	<	}
324	<	}
636	>	}
637	>	});
638	>
639	>	t.start();
640	>	t.join();
641	>	lock.readLock().unlock();
642	>	}
643
326	–
644
645		/**
646	<	* write timed trylock times out if locked
646	>	* Fair Read tryLock succeeds if readlocked but not writelocked
647		*/
648	<	public void testWriteTryLock_Timeout() {
649	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
650	<	lock.writeLock().lock();
651	<	Thread t = new Thread(new Runnable() {
648	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
649	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
650	>	lock.readLock().lock();
651	>	Thread t = new Thread(new Runnable() {
652		public void run() {
653	<	try {
654	<	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
655	<	} catch (Exception ex) {
656	<	threadUnexpectedException();
657	<	}
658	<	}
659	<	});
660	<	try {
661	<	t.start();
662	<	t.join();
663	<	lock.writeLock().unlock();
347	<	} catch(Exception e){
348	<	unexpectedException();
349	<	}
350	<	}
653	>	threadAssertTrue(lock.readLock().tryLock());
654	>	lock.readLock().unlock();
655	>	}
656	>	});
657	>
658	>	t.start();
659	>	t.join();
660	>	lock.readLock().unlock();
661	>	}
662	>
663	>
664
665		/**
666	<	* read timed trylock times out if write-locked
666	>	* Fair write tryLock fails when readlocked
667		*/
668	<	public void testReadTryLock_Timeout() {
669	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
670	<	lock.writeLock().lock();
671	<	Thread t = new Thread(new Runnable() {
668	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
669	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
670	>	lock.readLock().lock();
671	>	Thread t = new Thread(new Runnable() {
672		public void run() {
673	<	try {
674	<	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
675	<	} catch (Exception ex) {
676	<	threadUnexpectedException();
677	<	}
678	<	}
679	<	});
680	<	try {
681	<	t.start();
682	<	t.join();
683	<	lock.writeLock().unlock();
684	<	} catch(Exception e){
685	<	unexpectedException();
686	<	}
687	<	}
673	>	threadAssertFalse(lock.writeLock().tryLock());
674	>	}
675	>	});
676	>
677	>	t.start();
678	>	t.join();
679	>	lock.readLock().unlock();
680	>	}
681	>
682	>
683	>
684	>	/**
685	>	* write timed tryLock times out if locked
686	>	*/
687	>	public void testWriteTryLock_Timeout() throws InterruptedException {
688	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
689	>	lock.writeLock().lock();
690	>	Thread t = new Thread(new CheckedRunnable() {
691	>	public void realRun() throws InterruptedException {
692	>	threadAssertFalse(lock.writeLock().tryLock(1, MILLISECONDS));
693	>	}});
694	>
695	>	t.start();
696	>	t.join();
697	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
698	>	lock.writeLock().unlock();
699	>	}
700	>
701	>	/**
702	>	* read timed tryLock times out if write-locked
703	>	*/
704	>	public void testReadTryLock_Timeout() throws InterruptedException {
705	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
706	>	lock.writeLock().lock();
707	>	Thread t = new Thread(new CheckedRunnable() {
708	>	public void realRun() throws InterruptedException {
709	>	threadAssertFalse(lock.readLock().tryLock(1, MILLISECONDS));
710	>	}});
711	>
712	>	t.start();
713	>	t.join();
714	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
715	>	lock.writeLock().unlock();
716	>	}
717
718
719		/**
720		* write lockInterruptibly succeeds if lock free else is interruptible
721		*/
722	<	public void testWriteLockInterruptibly() {
723	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
724	<	try {
725	<	lock.writeLock().lockInterruptibly();
726	<	} catch(Exception e) {
727	<	unexpectedException();
728	<	}
729	<	Thread t = new Thread(new Runnable() {
730	<	public void run() {
731	<	try {
732	<	lock.writeLock().lockInterruptibly();
733	<	threadShouldThrow();
734	<	}
735	<	catch(InterruptedException success) {
394	<	}
395	<	}
396	<	});
397	<	try {
398	<	t.start();
399	<	t.interrupt();
400	<	t.join();
401	<	lock.writeLock().unlock();
402	<	} catch(Exception e){
403	<	unexpectedException();
404	<	}
722	>	public void testWriteLockInterruptibly() throws InterruptedException {
723	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
724	>	lock.writeLock().lockInterruptibly();
725	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
726	>	public void realRun() throws InterruptedException {
727	>	lock.writeLock().lockInterruptibly();
728	>	}});
729	>
730	>	t.start();
731	>	Thread.sleep(SHORT_DELAY_MS);
732	>	t.interrupt();
733	>	Thread.sleep(SHORT_DELAY_MS);
734	>	t.join();
735	>	lock.writeLock().unlock();
736		}
737
738		/**
739		*  read lockInterruptibly succeeds if lock free else is interruptible
740		*/
741	<	public void testReadLockInterruptibly() {
742	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
743	<	try {
744	<	lock.writeLock().lockInterruptibly();
745	<	} catch(Exception e) {
746	<	unexpectedException();
747	<	}
748	<	Thread t = new Thread(new Runnable() {
749	<	public void run() {
750	<	try {
751	<	lock.readLock().lockInterruptibly();
752	<	threadShouldThrow();
753	<	}
423	<	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	<	}
741	>	public void testReadLockInterruptibly() throws InterruptedException {
742	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
743	>	lock.writeLock().lockInterruptibly();
744	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
745	>	public void realRun() throws InterruptedException {
746	>	lock.readLock().lockInterruptibly();
747	>	}});
748	>
749	>	t.start();
750	>	Thread.sleep(SHORT_DELAY_MS);
751	>	t.interrupt();
752	>	t.join();
753	>	lock.writeLock().unlock();
754		}
755
756		/**
757		* Calling await without holding lock throws IllegalMonitorStateException
758		*/
759	<	public void testAwait_IllegalMonitor() {
760	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
759	>	public void testAwait_IllegalMonitor() throws InterruptedException {
760	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
761		final Condition c = lock.writeLock().newCondition();
762		try {
763		c.await();
764		shouldThrow();
765	<	}
447	<	catch (IllegalMonitorStateException success) {
448	<	}
449	<	catch (Exception ex) {
450	<	shouldThrow();
451	<	}
765	>	} catch (IllegalMonitorStateException success) {}
766		}
767
768		/**
769		* Calling signal without holding lock throws IllegalMonitorStateException
770		*/
771		public void testSignal_IllegalMonitor() {
772	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
772	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
773		final Condition c = lock.writeLock().newCondition();
774		try {
775		c.signal();
776		shouldThrow();
777	<	}
464	<	catch (IllegalMonitorStateException success) {
465	<	}
466	<	catch (Exception ex) {
467	<	unexpectedException();
468	<	}
777	>	} catch (IllegalMonitorStateException success) {}
778		}
779
780		/**
781		* awaitNanos without a signal times out
782		*/
783	<	public void testAwaitNanos_Timeout() {
784	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
783	>	public void testAwaitNanos_Timeout() throws InterruptedException {
784	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
785		final Condition c = lock.writeLock().newCondition();
786	<	try {
787	<	lock.writeLock().lock();
788	<	long t = c.awaitNanos(100);
789	<	assertTrue(t <= 0);
790	<	lock.writeLock().unlock();
482	<	}
483	<	catch (Exception ex) {
484	<	unexpectedException();
485	<	}
786	>
787	>	lock.writeLock().lock();
788	>	long t = c.awaitNanos(100);
789	>	assertTrue(t <= 0);
790	>	lock.writeLock().unlock();
791		}
792
793
794		/**
795		*  timed await without a signal times out
796		*/
797	<	public void testAwait_Timeout() {
798	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
797	>	public void testAwait_Timeout() throws InterruptedException {
798	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
799		final Condition c = lock.writeLock().newCondition();
800	<	try {
801	<	lock.writeLock().lock();
802	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
498	<	lock.writeLock().unlock();
499	<	}
500	<	catch (Exception ex) {
501	<	unexpectedException();
502	<	}
800	>	lock.writeLock().lock();
801	>	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
802	>	lock.writeLock().unlock();
803		}
804
805		/**
806		* awaitUntil without a signal times out
807		*/
808	<	public void testAwaitUntil_Timeout() {
809	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
808	>	public void testAwaitUntil_Timeout() throws InterruptedException {
809	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
810		final Condition c = lock.writeLock().newCondition();
811	<	try {
812	<	lock.writeLock().lock();
813	<	java.util.Date d = new java.util.Date();
814	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
515	<	lock.writeLock().unlock();
516	<	}
517	<	catch (Exception ex) {
518	<	unexpectedException();
519	<	}
811	>	lock.writeLock().lock();
812	>	java.util.Date d = new java.util.Date();
813	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
814	>	lock.writeLock().unlock();
815		}
816
817		/**
818		* await returns when signalled
819		*/
820	<	public void testAwait() {
821	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
820	>	public void testAwait() throws InterruptedException {
821	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
822		final Condition c = lock.writeLock().newCondition();
823	<	Thread t = new Thread(new Runnable() {
824	<	public void run() {
825	<	try {
826	<	lock.writeLock().lock();
827	<	c.await();
828	<	lock.writeLock().unlock();
829	<	}
830	<	catch(InterruptedException e) {
831	<	threadUnexpectedException();
832	<	}
833	<	}
834	<	});
823	>	Thread t = new Thread(new CheckedRunnable() {
824	>	public void realRun() throws InterruptedException {
825	>	lock.writeLock().lock();
826	>	c.await();
827	>	lock.writeLock().unlock();
828	>	}});
829	>
830	>	t.start();
831	>	Thread.sleep(SHORT_DELAY_MS);
832	>	lock.writeLock().lock();
833	>	c.signal();
834	>	lock.writeLock().unlock();
835	>	t.join(SHORT_DELAY_MS);
836	>	assertFalse(t.isAlive());
837	>	}
838	>
839	>	/** A helper class for uninterruptible wait tests */
840	>	class UninterruptableThread extends Thread {
841	>	private Lock lock;
842	>	private Condition c;
843	>
844	>	public volatile boolean canAwake = false;
845	>	public volatile boolean interrupted = false;
846	>	public volatile boolean lockStarted = false;
847	>
848	>	public UninterruptableThread(Lock lock, Condition c) {
849	>	this.lock = lock;
850	>	this.c = c;
851	>	}
852	>
853	>	public synchronized void run() {
854	>	lock.lock();
855	>	lockStarted = true;
856	>
857	>	while (!canAwake) {
858	>	c.awaitUninterruptibly();
859	>	}
860
861	<	try {
862	<	t.start();
543	<	Thread.sleep(SHORT_DELAY_MS);
544	<	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();
861	>	interrupted = isInterrupted();
862	>	lock.unlock();
863		}
864		}
865
866		/**
867		* awaitUninterruptibly doesn't abort on interrupt
868		*/
869	<	public void testAwaitUninterruptibly() {
870	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
869	>	public void testAwaitUninterruptibly() throws InterruptedException {
870	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
871		final Condition c = lock.writeLock().newCondition();
872	<	Thread t = new Thread(new Runnable() {
873	<	public void run() {
874	<	lock.writeLock().lock();
564	<	c.awaitUninterruptibly();
565	<	lock.writeLock().unlock();
566	<	}
567	<	});
872	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
873	>
874	>	thread.start();
875
876	+	while (!thread.lockStarted) {
877	+	Thread.sleep(100);
878	+	}
879	+
880	+	lock.writeLock().lock();
881		try {
882	<	t.start();
883	<	Thread.sleep(SHORT_DELAY_MS);
572	<	t.interrupt();
573	<	lock.writeLock().lock();
882	>	thread.interrupt();
883	>	thread.canAwake = true;
884		c.signal();
885	+	} finally {
886		lock.writeLock().unlock();
576	–	assert(t.isInterrupted());
577	–	t.join(SHORT_DELAY_MS);
578	–	assertFalse(t.isAlive());
579	–	}
580	–	catch (Exception ex) {
581	–	unexpectedException();
887		}
888	+
889	+	thread.join();
890	+	assertTrue(thread.interrupted);
891	+	assertFalse(thread.isAlive());
892		}
893
894		/**
895		* await is interruptible
896		*/
897	<	public void testAwait_Interrupt() {
898	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
897	>	public void testAwait_Interrupt() throws InterruptedException {
898	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
899		final Condition c = lock.writeLock().newCondition();
900	<	Thread t = new Thread(new Runnable() {
901	<	public void run() {
902	<	try {
903	<	lock.writeLock().lock();
904	<	c.await();
905	<	lock.writeLock().unlock();
906	<	threadShouldThrow();
907	<	}
908	<	catch(InterruptedException success) {
909	<	}
910	<	}
911	<	});
603	<
604	<	try {
605	<	t.start();
606	<	Thread.sleep(SHORT_DELAY_MS);
607	<	t.interrupt();
608	<	t.join(SHORT_DELAY_MS);
609	<	assertFalse(t.isAlive());
610	<	}
611	<	catch (Exception ex) {
612	<	unexpectedException();
613	<	}
900	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
901	>	public void realRun() throws InterruptedException {
902	>	lock.writeLock().lock();
903	>	c.await();
904	>	lock.writeLock().unlock();
905	>	}});
906	>
907	>	t.start();
908	>	Thread.sleep(SHORT_DELAY_MS);
909	>	t.interrupt();
910	>	t.join(SHORT_DELAY_MS);
911	>	assertFalse(t.isAlive());
912		}
913
914		/**
915		* awaitNanos is interruptible
916		*/
917	<	public void testAwaitNanos_Interrupt() {
918	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
917	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
918	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
919		final Condition c = lock.writeLock().newCondition();
920	<	Thread t = new Thread(new Runnable() {
921	<	public void run() {
922	<	try {
923	<	lock.writeLock().lock();
924	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
925	<	lock.writeLock().unlock();
926	<	threadShouldThrow();
927	<	}
928	<	catch(InterruptedException success) {
929	<	}
930	<	}
931	<	});
634	<
635	<	try {
636	<	t.start();
637	<	Thread.sleep(SHORT_DELAY_MS);
638	<	t.interrupt();
639	<	t.join(SHORT_DELAY_MS);
640	<	assertFalse(t.isAlive());
641	<	}
642	<	catch (Exception ex) {
643	<	unexpectedException();
644	<	}
920	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
921	>	public void realRun() throws InterruptedException {
922	>	lock.writeLock().lock();
923	>	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
924	>	lock.writeLock().unlock();
925	>	}});
926	>
927	>	t.start();
928	>	Thread.sleep(SHORT_DELAY_MS);
929	>	t.interrupt();
930	>	t.join(SHORT_DELAY_MS);
931	>	assertFalse(t.isAlive());
932		}
933
934		/**
935		* awaitUntil is interruptible
936		*/
937	<	public void testAwaitUntil_Interrupt() {
938	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
937	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
938	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
939		final Condition c = lock.writeLock().newCondition();
940	<	Thread t = new Thread(new Runnable() {
941	<	public void run() {
942	<	try {
943	<	lock.writeLock().lock();
944	<	java.util.Date d = new java.util.Date();
945	<	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
946	<	lock.writeLock().unlock();
947	<	threadShouldThrow();
948	<	}
949	<	catch(InterruptedException success) {
950	<	}
951	<	}
952	<	});
666	<
667	<	try {
668	<	t.start();
669	<	Thread.sleep(SHORT_DELAY_MS);
670	<	t.interrupt();
671	<	t.join(SHORT_DELAY_MS);
672	<	assertFalse(t.isAlive());
673	<	}
674	<	catch (Exception ex) {
675	<	unexpectedException();
676	<	}
940	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
941	>	public void realRun() throws InterruptedException {
942	>	lock.writeLock().lock();
943	>	java.util.Date d = new java.util.Date();
944	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
945	>	lock.writeLock().unlock();
946	>	}});
947	>
948	>	t.start();
949	>	Thread.sleep(SHORT_DELAY_MS);
950	>	t.interrupt();
951	>	t.join(SHORT_DELAY_MS);
952	>	assertFalse(t.isAlive());
953		}
954
955		/**
956		* signalAll wakes up all threads
957		*/
958	<	public void testSignalAll() {
959	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
958	>	public void testSignalAll() throws InterruptedException {
959	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
960		final Condition c = lock.writeLock().newCondition();
961	<	Thread t1 = new Thread(new Runnable() {
962	<	public void run() {
963	<	try {
964	<	lock.writeLock().lock();
965	<	c.await();
966	<	lock.writeLock().unlock();
967	<	}
968	<	catch(InterruptedException e) {
969	<	threadUnexpectedException();
970	<	}
971	<	}
972	<	});
973	<
974	<	Thread t2 = new Thread(new Runnable() {
975	<	public void run() {
976	<	try {
977	<	lock.writeLock().lock();
978	<	c.await();
979	<	lock.writeLock().unlock();
980	<	}
981	<	catch(InterruptedException e) {
982	<	threadUnexpectedException();
983	<	}
984	<	}
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	<	}
961	>	Thread t1 = new Thread(new CheckedRunnable() {
962	>	public void realRun() throws InterruptedException {
963	>	lock.writeLock().lock();
964	>	c.await();
965	>	lock.writeLock().unlock();
966	>	}});
967	>
968	>	Thread t2 = new Thread(new CheckedRunnable() {
969	>	public void realRun() throws InterruptedException {
970	>	lock.writeLock().lock();
971	>	c.await();
972	>	lock.writeLock().unlock();
973	>	}});
974	>
975	>	t1.start();
976	>	t2.start();
977	>	Thread.sleep(SHORT_DELAY_MS);
978	>	lock.writeLock().lock();
979	>	c.signalAll();
980	>	lock.writeLock().unlock();
981	>	t1.join(SHORT_DELAY_MS);
982	>	t2.join(SHORT_DELAY_MS);
983	>	assertFalse(t1.isAlive());
984	>	assertFalse(t2.isAlive());
985		}
986
987		/**
988		* A serialized lock deserializes as unlocked
989		*/
990	<	public void testSerialization() {
990	>	public void testSerialization() throws Exception {
991		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
992		l.readLock().lock();
993		l.readLock().unlock();
994
995	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
996	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
997	+	out.writeObject(l);
998	+	out.close();
999	+
1000	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1001	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1002	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1003	+	r.readLock().lock();
1004	+	r.readLock().unlock();
1005	+	}
1006	+
1007	+	/**
1008	+	* hasQueuedThreads reports whether there are waiting threads
1009	+	*/
1010	+	public void testhasQueuedThreads() throws InterruptedException {
1011	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1012	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1013	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1014	+	assertFalse(lock.hasQueuedThreads());
1015	+	lock.writeLock().lock();
1016	+	t1.start();
1017	+	Thread.sleep(SHORT_DELAY_MS);
1018	+	assertTrue(lock.hasQueuedThreads());
1019	+	t2.start();
1020	+	Thread.sleep(SHORT_DELAY_MS);
1021	+	assertTrue(lock.hasQueuedThreads());
1022	+	t1.interrupt();
1023	+	Thread.sleep(SHORT_DELAY_MS);
1024	+	assertTrue(lock.hasQueuedThreads());
1025	+	lock.writeLock().unlock();
1026	+	Thread.sleep(SHORT_DELAY_MS);
1027	+	assertFalse(lock.hasQueuedThreads());
1028	+	t1.join();
1029	+	t2.join();
1030	+	}
1031	+
1032	+	/**
1033	+	* hasQueuedThread(null) throws NPE
1034	+	*/
1035	+	public void testHasQueuedThreadNPE() {
1036	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1037	+	try {
1038	+	sync.hasQueuedThread(null);
1039	+	shouldThrow();
1040	+	} catch (NullPointerException success) {}
1041	+	}
1042	+
1043	+	/**
1044	+	* hasQueuedThread reports whether a thread is queued.
1045	+	*/
1046	+	public void testHasQueuedThread() throws InterruptedException {
1047	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1048	+	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1049	+	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1050	+	assertFalse(sync.hasQueuedThread(t1));
1051	+	assertFalse(sync.hasQueuedThread(t2));
1052	+	sync.writeLock().lock();
1053	+	t1.start();
1054	+	Thread.sleep(SHORT_DELAY_MS);
1055	+	assertTrue(sync.hasQueuedThread(t1));
1056	+	t2.start();
1057	+	Thread.sleep(SHORT_DELAY_MS);
1058	+	assertTrue(sync.hasQueuedThread(t1));
1059	+	assertTrue(sync.hasQueuedThread(t2));
1060	+	t1.interrupt();
1061	+	Thread.sleep(SHORT_DELAY_MS);
1062	+	assertFalse(sync.hasQueuedThread(t1));
1063	+	assertTrue(sync.hasQueuedThread(t2));
1064	+	sync.writeLock().unlock();
1065	+	Thread.sleep(SHORT_DELAY_MS);
1066	+	assertFalse(sync.hasQueuedThread(t1));
1067	+	Thread.sleep(SHORT_DELAY_MS);
1068	+	assertFalse(sync.hasQueuedThread(t2));
1069	+	t1.join();
1070	+	t2.join();
1071	+	}
1072	+
1073	+
1074	+	/**
1075	+	* getQueueLength reports number of waiting threads
1076	+	*/
1077	+	public void testGetQueueLength() throws InterruptedException {
1078	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1079	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1080	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1081	+	assertEquals(0, lock.getQueueLength());
1082	+	lock.writeLock().lock();
1083	+	t1.start();
1084	+	Thread.sleep(SHORT_DELAY_MS);
1085	+	assertEquals(1, lock.getQueueLength());
1086	+	t2.start();
1087	+	Thread.sleep(SHORT_DELAY_MS);
1088	+	assertEquals(2, lock.getQueueLength());
1089	+	t1.interrupt();
1090	+	Thread.sleep(SHORT_DELAY_MS);
1091	+	assertEquals(1, lock.getQueueLength());
1092	+	lock.writeLock().unlock();
1093	+	Thread.sleep(SHORT_DELAY_MS);
1094	+	assertEquals(0, lock.getQueueLength());
1095	+	t1.join();
1096	+	t2.join();
1097	+	}
1098	+
1099	+	/**
1100	+	* getQueuedThreads includes waiting threads
1101	+	*/
1102	+	public void testGetQueuedThreads() throws InterruptedException {
1103	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1104	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1105	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1106	+	assertTrue(lock.getQueuedThreads().isEmpty());
1107	+	lock.writeLock().lock();
1108	+	assertTrue(lock.getQueuedThreads().isEmpty());
1109	+	t1.start();
1110	+	Thread.sleep(SHORT_DELAY_MS);
1111	+	assertTrue(lock.getQueuedThreads().contains(t1));
1112	+	t2.start();
1113	+	Thread.sleep(SHORT_DELAY_MS);
1114	+	assertTrue(lock.getQueuedThreads().contains(t1));
1115	+	assertTrue(lock.getQueuedThreads().contains(t2));
1116	+	t1.interrupt();
1117	+	Thread.sleep(SHORT_DELAY_MS);
1118	+	assertFalse(lock.getQueuedThreads().contains(t1));
1119	+	assertTrue(lock.getQueuedThreads().contains(t2));
1120	+	lock.writeLock().unlock();
1121	+	Thread.sleep(SHORT_DELAY_MS);
1122	+	assertTrue(lock.getQueuedThreads().isEmpty());
1123	+	t1.join();
1124	+	t2.join();
1125	+	}
1126	+
1127	+	/**
1128	+	* hasWaiters throws NPE if null
1129	+	*/
1130	+	public void testHasWaitersNPE() {
1131	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1132	+	try {
1133	+	lock.hasWaiters(null);
1134	+	shouldThrow();
1135	+	} catch (NullPointerException success) {}
1136	+	}
1137	+
1138	+	/**
1139	+	* getWaitQueueLength throws NPE if null
1140	+	*/
1141	+	public void testGetWaitQueueLengthNPE() {
1142	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1143		try {
1144	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1145	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1146	<	out.writeObject(l);
1147	<	out.close();
1148	<
1149	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1150	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1151	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1152	<	r.readLock().lock();
1153	<	r.readLock().unlock();
1154	<	} catch(Exception e){
1155	<	e.printStackTrace();
1156	<	unexpectedException();
1157	<	}
1144	>	lock.getWaitQueueLength(null);
1145	>	shouldThrow();
1146	>	} catch (NullPointerException success) {}
1147	>	}
1148	>
1149	>
1150	>	/**
1151	>	* getWaitingThreads throws NPE if null
1152	>	*/
1153	>	public void testGetWaitingThreadsNPE() {
1154	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1155	>	try {
1156	>	lock.getWaitingThreads(null);
1157	>	shouldThrow();
1158	>	} catch (NullPointerException success) {}
1159	>	}
1160	>
1161	>	/**
1162	>	* hasWaiters throws IAE if not owned
1163	>	*/
1164	>	public void testHasWaitersIAE() {
1165	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1166	>	final Condition c = lock.writeLock().newCondition();
1167	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1168	>	try {
1169	>	lock2.hasWaiters(c);
1170	>	shouldThrow();
1171	>	} catch (IllegalArgumentException success) {}
1172	>	}
1173	>
1174	>	/**
1175	>	* hasWaiters throws IMSE if not locked
1176	>	*/
1177	>	public void testHasWaitersIMSE() {
1178	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1179	>	final Condition c = lock.writeLock().newCondition();
1180	>	try {
1181	>	lock.hasWaiters(c);
1182	>	shouldThrow();
1183	>	} catch (IllegalMonitorStateException success) {}
1184	>	}
1185	>
1186	>
1187	>	/**
1188	>	* getWaitQueueLength throws IAE if not owned
1189	>	*/
1190	>	public void testGetWaitQueueLengthIAE() {
1191	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1192	>	final Condition c = lock.writeLock().newCondition();
1193	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1194	>	try {
1195	>	lock2.getWaitQueueLength(c);
1196	>	shouldThrow();
1197	>	} catch (IllegalArgumentException success) {}
1198	>	}
1199	>
1200	>	/**
1201	>	* getWaitQueueLength throws IMSE if not locked
1202	>	*/
1203	>	public void testGetWaitQueueLengthIMSE() {
1204	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1205	>	final Condition c = lock.writeLock().newCondition();
1206	>	try {
1207	>	lock.getWaitQueueLength(c);
1208	>	shouldThrow();
1209	>	} catch (IllegalMonitorStateException success) {}
1210		}
1211
1212
1213	+	/**
1214	+	* getWaitingThreads throws IAE if not owned
1215	+	*/
1216	+	public void testGetWaitingThreadsIAE() {
1217	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1218	+	final Condition c = lock.writeLock().newCondition();
1219	+	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1220	+	try {
1221	+	lock2.getWaitingThreads(c);
1222	+	shouldThrow();
1223	+	} catch (IllegalArgumentException success) {}
1224	+	}
1225	+
1226	+	/**
1227	+	* getWaitingThreads throws IMSE if not locked
1228	+	*/
1229	+	public void testGetWaitingThreadsIMSE() {
1230	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1231	+	final Condition c = lock.writeLock().newCondition();
1232	+	try {
1233	+	lock.getWaitingThreads(c);
1234	+	shouldThrow();
1235	+	} catch (IllegalMonitorStateException success) {}
1236	+	}
1237	+
1238	+
1239	+	/**
1240	+	* hasWaiters returns true when a thread is waiting, else false
1241	+	*/
1242	+	public void testHasWaiters() throws InterruptedException {
1243	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1244	+	final Condition c = lock.writeLock().newCondition();
1245	+	Thread t = new Thread(new CheckedRunnable() {
1246	+	public void realRun() throws InterruptedException {
1247	+	lock.writeLock().lock();
1248	+	threadAssertFalse(lock.hasWaiters(c));
1249	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1250	+	c.await();
1251	+	lock.writeLock().unlock();
1252	+	}});
1253	+
1254	+	t.start();
1255	+	Thread.sleep(SHORT_DELAY_MS);
1256	+	lock.writeLock().lock();
1257	+	assertTrue(lock.hasWaiters(c));
1258	+	assertEquals(1, lock.getWaitQueueLength(c));
1259	+	c.signal();
1260	+	lock.writeLock().unlock();
1261	+	Thread.sleep(SHORT_DELAY_MS);
1262	+	lock.writeLock().lock();
1263	+	assertFalse(lock.hasWaiters(c));
1264	+	assertEquals(0, lock.getWaitQueueLength(c));
1265	+	lock.writeLock().unlock();
1266	+	t.join(SHORT_DELAY_MS);
1267	+	assertFalse(t.isAlive());
1268	+	}
1269	+
1270	+	/**
1271	+	* getWaitQueueLength returns number of waiting threads
1272	+	*/
1273	+	public void testGetWaitQueueLength() throws InterruptedException {
1274	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1275	+	final Condition c = lock.writeLock().newCondition();
1276	+	Thread t = new Thread(new CheckedRunnable() {
1277	+	public void realRun() throws InterruptedException {
1278	+	lock.writeLock().lock();
1279	+	threadAssertFalse(lock.hasWaiters(c));
1280	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1281	+	c.await();
1282	+	lock.writeLock().unlock();
1283	+	}});
1284	+
1285	+	t.start();
1286	+	Thread.sleep(SHORT_DELAY_MS);
1287	+	lock.writeLock().lock();
1288	+	assertTrue(lock.hasWaiters(c));
1289	+	assertEquals(1, lock.getWaitQueueLength(c));
1290	+	c.signal();
1291	+	lock.writeLock().unlock();
1292	+	Thread.sleep(SHORT_DELAY_MS);
1293	+	lock.writeLock().lock();
1294	+	assertFalse(lock.hasWaiters(c));
1295	+	assertEquals(0, lock.getWaitQueueLength(c));
1296	+	lock.writeLock().unlock();
1297	+	t.join(SHORT_DELAY_MS);
1298	+	assertFalse(t.isAlive());
1299	+	}
1300	+
1301	+
1302	+	/**
1303	+	* getWaitingThreads returns only and all waiting threads
1304	+	*/
1305	+	public void testGetWaitingThreads() throws InterruptedException {
1306	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1307	+	final Condition c = lock.writeLock().newCondition();
1308	+	Thread t1 = new Thread(new CheckedRunnable() {
1309	+	public void realRun() throws InterruptedException {
1310	+	lock.writeLock().lock();
1311	+	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1312	+	c.await();
1313	+	lock.writeLock().unlock();
1314	+	}});
1315	+
1316	+	Thread t2 = new Thread(new CheckedRunnable() {
1317	+	public void realRun() throws InterruptedException {
1318	+	lock.writeLock().lock();
1319	+	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1320	+	c.await();
1321	+	lock.writeLock().unlock();
1322	+	}});
1323	+
1324	+	lock.writeLock().lock();
1325	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1326	+	lock.writeLock().unlock();
1327	+	t1.start();
1328	+	Thread.sleep(SHORT_DELAY_MS);
1329	+	t2.start();
1330	+	Thread.sleep(SHORT_DELAY_MS);
1331	+	lock.writeLock().lock();
1332	+	assertTrue(lock.hasWaiters(c));
1333	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1334	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1335	+	c.signalAll();
1336	+	lock.writeLock().unlock();
1337	+	Thread.sleep(SHORT_DELAY_MS);
1338	+	lock.writeLock().lock();
1339	+	assertFalse(lock.hasWaiters(c));
1340	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1341	+	lock.writeLock().unlock();
1342	+	t1.join(SHORT_DELAY_MS);
1343	+	t2.join(SHORT_DELAY_MS);
1344	+	assertFalse(t1.isAlive());
1345	+	assertFalse(t2.isAlive());
1346	+	}
1347	+
1348	+	/**
1349	+	* toString indicates current lock state
1350	+	*/
1351	+	public void testToString() {
1352	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1353	+	String us = lock.toString();
1354	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1355	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1356	+	lock.writeLock().lock();
1357	+	String ws = lock.toString();
1358	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1359	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1360	+	lock.writeLock().unlock();
1361	+	lock.readLock().lock();
1362	+	lock.readLock().lock();
1363	+	String rs = lock.toString();
1364	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1365	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1366	+	}
1367	+
1368	+	/**
1369	+	* readLock.toString indicates current lock state
1370	+	*/
1371	+	public void testReadLockToString() {
1372	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1373	+	String us = lock.readLock().toString();
1374	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1375	+	lock.readLock().lock();
1376	+	lock.readLock().lock();
1377	+	String rs = lock.readLock().toString();
1378	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1379	+	}
1380	+
1381	+	/**
1382	+	* writeLock.toString indicates current lock state
1383	+	*/
1384	+	public void testWriteLockToString() {
1385	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1386	+	String us = lock.writeLock().toString();
1387	+	assertTrue(us.indexOf("Unlocked") >= 0);
1388	+	lock.writeLock().lock();
1389	+	String ls = lock.writeLock().toString();
1390	+	assertTrue(ls.indexOf("Locked") >= 0);
1391	+	}
1392	+
1393		}

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