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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.5 by dl, Fri Sep 26 15:33:13 2003 UTC vs.
Revision 1.39 by jsr166, Mon Nov 30 08:31:09 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	+	/**
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		/**
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();
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();
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();
100	<	} catch(Exception e){
101	<	unexpectedException();
156	>	assertEquals(i-1,lock.writeLock().getHoldCount());
157		}
158		}
159
160		/**
161	<	* read-lockInterruptibly is interruptible
161	>	* getReadHoldCount returns number of recursive holds
162		*/
163	<	public void testReadLockInterruptibly_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.readLock().lockInterruptibly();
170	<	threadShouldThrow();
171	<	} catch(InterruptedException success){}
117	<	}
118	<	});
119	<	try {
120	<	t.start();
121	<	t.interrupt();
122	<	lock.writeLock().unlock();
123	<	t.join();
124	<	} catch(Exception e){
125	<	unexpectedException();
126	<	}
127	<	}
128	<
129	<	/**
130	<	* timed read-trylock is interruptible
131	<	*/
132	<	public void testReadTryLock_Interrupted() {
133	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
134	<	lock.writeLock().lock();
135	<	Thread t = new Thread(new Runnable() {
136	<	public void run() {
137	<	try {
138	<	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
139	<	threadShouldThrow();
140	<	} catch(InterruptedException success){}
141	<	}
142	<	});
143	<	try {
144	<	t.start();
145	<	t.interrupt();
146	<	t.join();
147	<	} catch(Exception e){
148	<	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
152	–
153	–	/**
154	–	* write-trylock fails if locked
155	–	*/
156	–	public void testWriteTryLockWhenLocked() {
157	–	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
158	–	lock.writeLock().lock();
159	–	Thread t = new Thread(new Runnable() {
160	–	public void run() {
161	–	threadAssertFalse(lock.writeLock().tryLock());
162	–	}
163	–	});
164	–	try {
165	–	t.start();
166	–	t.join();
167	–	lock.writeLock().unlock();
168	–	} catch(Exception e){
169	–	unexpectedException();
170	–	}
171	–	}
175
176		/**
177	<	* read-trylock fails if locked
177	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
178		*/
179	<	public void testReadTryLockWhenLocked() {
180	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
178	<	lock.writeLock().lock();
179	<	Thread t = new Thread(new Runnable() {
180	<	public void run() {
181	<	threadAssertFalse(lock.readLock().tryLock());
182	<	}
183	<	});
179	>	public void testUnlock_IllegalMonitorStateException() {
180	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
181		try {
182	<	t.start();
183	<	t.join();
184	<	lock.writeLock().unlock();
185	<	} catch(Exception e){
186	<	unexpectedException();
190	<	}
191	<	}
182	>	rl.writeLock().unlock();
183	>	shouldThrow();
184	>	} catch (IllegalMonitorStateException success) {}
185	>	}
186	>
187
188		/**
189	<	* Multiple threads can hold a read lock when not write-locked
189	>	* write-lockInterruptibly is interruptible
190		*/
191	<	public void testMultipleReadLocks() {
192	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
193	<	lock.readLock().lock();
194	<	Thread t = new Thread(new Runnable() {
195	<	public void run() {
196	<	threadAssertTrue(lock.readLock().tryLock());
197	<	lock.readLock().unlock();
198	<	}
199	<	});
200	<	try {
201	<	t.start();
202	<	t.join();
203	<	lock.readLock().unlock();
204	<	} catch(Exception e){
205	<	unexpectedException();
206	<	}
207	<	}
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	<	* A writelock succeeds after reading threads unlock
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(SMALL_DELAY_MS, MILLISECONDS);
219	>	}});
220	>
221	>	t.start();
222	>	Thread.sleep(SHORT_DELAY_MS);
223	>	t.interrupt();
224	>	lock.writeLock().unlock();
225	>	t.join();
226	>	}
227	>
228	>	/**
229	>	* read-lockInterruptibly is interruptible
230		*/
231	<	public void testWriteAfterMultipleReadLocks() {
232	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
233	<	lock.readLock().lock();
234	<	Thread t1 = new Thread(new Runnable() {
235	<	public void run() {
236	<	lock.readLock().lock();
237	<	lock.readLock().unlock();
238	<	}
239	<	});
240	<	Thread t2 = new Thread(new Runnable() {
241	<	public void run() {
242	<	lock.writeLock().lock();
243	<	lock.writeLock().unlock();
244	<	}
245	<	});
232	<
233	<	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	<	}
231	>	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
232	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
233	>	lock.writeLock().lock();
234	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
235	>	public void realRun() throws InterruptedException {
236	>	lock.readLock().lockInterruptibly();
237	>	}});
238	>
239	>	t.start();
240	>	Thread.sleep(SHORT_DELAY_MS);
241	>	t.interrupt();
242	>	Thread.sleep(SHORT_DELAY_MS);
243	>	lock.writeLock().unlock();
244	>	t.join();
245	>	}
246
247		/**
248	<	* Readlocks succeed after a writing thread unlocks
248	>	* timed read-tryLock is interruptible
249		*/
250	<	public void testReadAfterWriteLock() {
251	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
252	<	lock.writeLock().lock();
253	<	Thread t1 = new Thread(new Runnable() {
254	<	public void run() {
255	<	lock.readLock().lock();
256	<	lock.readLock().unlock();
257	<	}
258	<	});
259	<	Thread t2 = new Thread(new Runnable() {
260	<	public void run() {
261	<	lock.readLock().lock();
262	<	lock.readLock().unlock();
264	<	}
265	<	});
266	<
267	<	try {
268	<	t1.start();
269	<	t2.start();
270	<	Thread.sleep(SHORT_DELAY_MS);
271	<	lock.writeLock().unlock();
272	<	t1.join(MEDIUM_DELAY_MS);
273	<	t2.join(MEDIUM_DELAY_MS);
274	<	assertTrue(!t1.isAlive());
275	<	assertTrue(!t2.isAlive());
276	<
277	<	} catch(Exception e){
278	<	unexpectedException();
279	<	}
280	<	}
250	>	public void testReadTryLock_Interrupted() throws InterruptedException {
251	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
252	>	lock.writeLock().lock();
253	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
254	>	public void realRun() throws InterruptedException {
255	>	lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS);
256	>	}});
257	>
258	>	t.start();
259	>	Thread.sleep(SHORT_DELAY_MS);
260	>	t.interrupt();
261	>	t.join();
262	>	}
263
264
265		/**
266	<	* Read trylock succeeds if readlocked but not writelocked
267	<	*/
268	<	public void testTryLockWhenReadLocked() {
269	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
270	<	lock.readLock().lock();
271	<	Thread t = new Thread(new Runnable() {
272	<	public void run() {
273	<	threadAssertTrue(lock.readLock().tryLock());
274	<	lock.readLock().unlock();
293	<	}
294	<	});
295	<	try {
296	<	t.start();
297	<	t.join();
298	<	lock.readLock().unlock();
299	<	} catch(Exception e){
300	<	unexpectedException();
301	<	}
302	<	}
266	>	* write-tryLock fails if locked
267	>	*/
268	>	public void testWriteTryLockWhenLocked() throws InterruptedException {
269	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
270	>	lock.writeLock().lock();
271	>	Thread t = new Thread(new CheckedRunnable() {
272	>	public void realRun() {
273	>	threadAssertFalse(lock.writeLock().tryLock());
274	>	}});
275
276	<
276	>	t.start();
277	>	t.join();
278	>	lock.writeLock().unlock();
279	>	}
280
281		/**
282	<	* write trylock fails when readlocked
282	>	* read-tryLock fails if locked
283		*/
284	<	public void testWriteTryLockWhenReadLocked() {
285	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
286	<	lock.readLock().lock();
287	<	Thread t = new Thread(new Runnable() {
288	<	public void run() {
289	<	threadAssertFalse(lock.writeLock().tryLock());
290	<	}
316	<	});
317	<	try {
318	<	t.start();
319	<	t.join();
320	<	lock.readLock().unlock();
321	<	} catch(Exception e){
322	<	unexpectedException();
323	<	}
324	<	}
284	>	public void testReadTryLockWhenLocked() throws InterruptedException {
285	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
286	>	lock.writeLock().lock();
287	>	Thread t = new Thread(new CheckedRunnable() {
288	>	public void realRun() {
289	>	threadAssertFalse(lock.readLock().tryLock());
290	>	}});
291
292	<
292	>	t.start();
293	>	t.join();
294	>	lock.writeLock().unlock();
295	>	}
296
297		/**
298	<	* write timed trylock times out if locked
299	<	*/
300	<	public void testWriteTryLock_Timeout() {
301	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
302	<	lock.writeLock().lock();
303	<	Thread t = new Thread(new Runnable() {
304	<	public void run() {
305	<	try {
306	<	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
307	<	} catch (Exception ex) {
308	<	threadUnexpectedException();
309	<	}
310	<	}
311	<	});
312	<	try {
344	<	t.start();
345	<	t.join();
346	<	lock.writeLock().unlock();
347	<	} catch(Exception e){
348	<	unexpectedException();
349	<	}
350	<	}
298	>	* Multiple threads can hold a read lock when not write-locked
299	>	*/
300	>	public void testMultipleReadLocks() throws InterruptedException {
301	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
302	>	lock.readLock().lock();
303	>	Thread t = new Thread(new CheckedRunnable() {
304	>	public void realRun() {
305	>	threadAssertTrue(lock.readLock().tryLock());
306	>	lock.readLock().unlock();
307	>	}});
308	>
309	>	t.start();
310	>	t.join();
311	>	lock.readLock().unlock();
312	>	}
313
314		/**
315	<	* read timed trylock times out if write-locked
315	>	* A writelock succeeds after reading threads unlock
316		*/
317	<	public void testReadTryLock_Timeout() {
318	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
319	<	lock.writeLock().lock();
320	<	Thread t = new Thread(new Runnable() {
321	<	public void run() {
322	<	try {
323	<	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
324	<	} catch (Exception ex) {
325	<	threadUnexpectedException();
326	<	}
327	<	}
328	<	});
329	<	try {
330	<	t.start();
331	<	t.join();
332	<	lock.writeLock().unlock();
333	<	} catch(Exception e){
334	<	unexpectedException();
335	<	}
336	<	}
317	>	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
318	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
319	>	lock.readLock().lock();
320	>	Thread t1 = new Thread(new CheckedRunnable() {
321	>	public void realRun() {
322	>	lock.readLock().lock();
323	>	lock.readLock().unlock();
324	>	}});
325	>	Thread t2 = new Thread(new CheckedRunnable() {
326	>	public void realRun() {
327	>	lock.writeLock().lock();
328	>	lock.writeLock().unlock();
329	>	}});
330	>
331	>	t1.start();
332	>	t2.start();
333	>	Thread.sleep(SHORT_DELAY_MS);
334	>	lock.readLock().unlock();
335	>	t1.join(MEDIUM_DELAY_MS);
336	>	t2.join(MEDIUM_DELAY_MS);
337	>	assertTrue(!t1.isAlive());
338	>	assertTrue(!t2.isAlive());
339	>	}
340	>
341	>	/**
342	>	* Readlocks succeed after a writing thread unlocks
343	>	*/
344	>	public void testReadAfterWriteLock() throws InterruptedException {
345	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
346	>	lock.writeLock().lock();
347	>	Thread t1 = new Thread(new CheckedRunnable() {
348	>	public void realRun() {
349	>	lock.readLock().lock();
350	>	lock.readLock().unlock();
351	>	}});
352	>	Thread t2 = new Thread(new CheckedRunnable() {
353	>	public void realRun() {
354	>	lock.readLock().lock();
355	>	lock.readLock().unlock();
356	>	}});
357	>
358	>	t1.start();
359	>	t2.start();
360	>	Thread.sleep(SHORT_DELAY_MS);
361	>	lock.writeLock().unlock();
362	>	t1.join(MEDIUM_DELAY_MS);
363	>	t2.join(MEDIUM_DELAY_MS);
364	>	assertTrue(!t1.isAlive());
365	>	assertTrue(!t2.isAlive());
366	>	}
367	>
368	>	/**
369	>	* Read trylock succeeds if write locked by current thread
370	>	*/
371	>	public void testReadHoldingWriteLock() {
372	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
373	>	lock.writeLock().lock();
374	>	assertTrue(lock.readLock().tryLock());
375	>	lock.readLock().unlock();
376	>	lock.writeLock().unlock();
377	>	}
378	>
379	>	/**
380	>	* Read lock succeeds if write locked by current thread even if
381	>	* other threads are waiting for readlock
382	>	*/
383	>	public void testReadHoldingWriteLock2() throws InterruptedException {
384	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
385	>	lock.writeLock().lock();
386	>	Thread t1 = new Thread(new CheckedRunnable() {
387	>	public void realRun() {
388	>	lock.readLock().lock();
389	>	lock.readLock().unlock();
390	>	}});
391	>	Thread t2 = new Thread(new CheckedRunnable() {
392	>	public void realRun() {
393	>	lock.readLock().lock();
394	>	lock.readLock().unlock();
395	>	}});
396	>
397	>	t1.start();
398	>	t2.start();
399	>	lock.readLock().lock();
400	>	lock.readLock().unlock();
401	>	Thread.sleep(SHORT_DELAY_MS);
402	>	lock.readLock().lock();
403	>	lock.readLock().unlock();
404	>	lock.writeLock().unlock();
405	>	t1.join(MEDIUM_DELAY_MS);
406	>	t2.join(MEDIUM_DELAY_MS);
407	>	assertTrue(!t1.isAlive());
408	>	assertTrue(!t2.isAlive());
409	>	}
410	>
411	>	/**
412	>	*  Read lock succeeds if write locked by current thread even if
413	>	* other threads are waiting for writelock
414	>	*/
415	>	public void testReadHoldingWriteLock3() throws InterruptedException {
416	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
417	>	lock.writeLock().lock();
418	>	Thread t1 = new Thread(new CheckedRunnable() {
419	>	public void realRun() {
420	>	lock.writeLock().lock();
421	>	lock.writeLock().unlock();
422	>	}});
423	>	Thread t2 = new Thread(new CheckedRunnable() {
424	>	public void realRun() {
425	>	lock.writeLock().lock();
426	>	lock.writeLock().unlock();
427	>	}});
428	>
429	>	t1.start();
430	>	t2.start();
431	>	lock.readLock().lock();
432	>	lock.readLock().unlock();
433	>	Thread.sleep(SHORT_DELAY_MS);
434	>	lock.readLock().lock();
435	>	lock.readLock().unlock();
436	>	lock.writeLock().unlock();
437	>	t1.join(MEDIUM_DELAY_MS);
438	>	t2.join(MEDIUM_DELAY_MS);
439	>	assertTrue(!t1.isAlive());
440	>	assertTrue(!t2.isAlive());
441	>	}
442	>
443	>
444	>	/**
445	>	*  Write lock succeeds if write locked by current thread even if
446	>	* other threads are waiting for writelock
447	>	*/
448	>	public void testWriteHoldingWriteLock4() throws InterruptedException {
449	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
450	>	lock.writeLock().lock();
451	>	Thread t1 = new Thread(new CheckedRunnable() {
452	>	public void realRun() {
453	>	lock.writeLock().lock();
454	>	lock.writeLock().unlock();
455	>	}});
456	>	Thread t2 = new Thread(new CheckedRunnable() {
457	>	public void realRun() {
458	>	lock.writeLock().lock();
459	>	lock.writeLock().unlock();
460	>	}});
461	>
462	>	t1.start();
463	>	t2.start();
464	>	lock.writeLock().lock();
465	>	lock.writeLock().unlock();
466	>	Thread.sleep(SHORT_DELAY_MS);
467	>	lock.writeLock().lock();
468	>	lock.writeLock().unlock();
469	>	lock.writeLock().unlock();
470	>	t1.join(MEDIUM_DELAY_MS);
471	>	t2.join(MEDIUM_DELAY_MS);
472	>	assertTrue(!t1.isAlive());
473	>	assertTrue(!t2.isAlive());
474	>	}
475	>
476	>
477	>	/**
478	>	* Fair Read trylock succeeds if write locked by current thread
479	>	*/
480	>	public void testReadHoldingWriteLockFair() {
481	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
482	>	lock.writeLock().lock();
483	>	assertTrue(lock.readLock().tryLock());
484	>	lock.readLock().unlock();
485	>	lock.writeLock().unlock();
486	>	}
487	>
488	>	/**
489	>	* Fair Read lock succeeds if write locked by current thread even if
490	>	* other threads are waiting for readlock
491	>	*/
492	>	public void testReadHoldingWriteLockFair2() throws InterruptedException {
493	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
494	>	lock.writeLock().lock();
495	>	Thread t1 = new Thread(new CheckedRunnable() {
496	>	public void realRun() {
497	>	lock.readLock().lock();
498	>	lock.readLock().unlock();
499	>	}});
500	>	Thread t2 = new Thread(new CheckedRunnable() {
501	>	public void realRun() {
502	>	lock.readLock().lock();
503	>	lock.readLock().unlock();
504	>	}});
505	>
506	>	t1.start();
507	>	t2.start();
508	>	lock.readLock().lock();
509	>	lock.readLock().unlock();
510	>	Thread.sleep(SHORT_DELAY_MS);
511	>	lock.readLock().lock();
512	>	lock.readLock().unlock();
513	>	lock.writeLock().unlock();
514	>	t1.join(MEDIUM_DELAY_MS);
515	>	t2.join(MEDIUM_DELAY_MS);
516	>	assertTrue(!t1.isAlive());
517	>	assertTrue(!t2.isAlive());
518	>	}
519	>
520	>
521	>	/**
522	>	* Fair Read lock succeeds if write locked by current thread even if
523	>	* other threads are waiting for writelock
524	>	*/
525	>	public void testReadHoldingWriteLockFair3() throws InterruptedException {
526	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
527	>	lock.writeLock().lock();
528	>	Thread t1 = new Thread(new CheckedRunnable() {
529	>	public void realRun() {
530	>	lock.writeLock().lock();
531	>	lock.writeLock().unlock();
532	>	}});
533	>	Thread t2 = new Thread(new CheckedRunnable() {
534	>	public void realRun() {
535	>	lock.writeLock().lock();
536	>	lock.writeLock().unlock();
537	>	}});
538	>
539	>	t1.start();
540	>	t2.start();
541	>	lock.readLock().lock();
542	>	lock.readLock().unlock();
543	>	Thread.sleep(SHORT_DELAY_MS);
544	>	lock.readLock().lock();
545	>	lock.readLock().unlock();
546	>	lock.writeLock().unlock();
547	>	t1.join(MEDIUM_DELAY_MS);
548	>	t2.join(MEDIUM_DELAY_MS);
549	>	assertTrue(!t1.isAlive());
550	>	assertTrue(!t2.isAlive());
551	>	}
552	>
553	>
554	>	/**
555	>	* Fair Write lock succeeds if write locked by current thread even if
556	>	* other threads are waiting for writelock
557	>	*/
558	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
559	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
560	>	lock.writeLock().lock();
561	>	Thread t1 = new Thread(new CheckedRunnable() {
562	>	public void realRun() {
563	>	lock.writeLock().lock();
564	>	lock.writeLock().unlock();
565	>	}});
566	>	Thread t2 = new Thread(new CheckedRunnable() {
567	>	public void realRun() {
568	>	lock.writeLock().lock();
569	>	lock.writeLock().unlock();
570	>	}});
571	>
572	>	t1.start();
573	>	t2.start();
574	>	Thread.sleep(SHORT_DELAY_MS);
575	>	assertTrue(lock.isWriteLockedByCurrentThread());
576	>	assertTrue(lock.getWriteHoldCount() == 1);
577	>	lock.writeLock().lock();
578	>	assertTrue(lock.getWriteHoldCount() == 2);
579	>	lock.writeLock().unlock();
580	>	lock.writeLock().lock();
581	>	lock.writeLock().unlock();
582	>	lock.writeLock().unlock();
583	>	t1.join(MEDIUM_DELAY_MS);
584	>	t2.join(MEDIUM_DELAY_MS);
585	>	assertTrue(!t1.isAlive());
586	>	assertTrue(!t2.isAlive());
587	>	}
588	>
589	>
590	>	/**
591	>	* Read tryLock succeeds if readlocked but not writelocked
592	>	*/
593	>	public void testTryLockWhenReadLocked() throws InterruptedException {
594	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
595	>	lock.readLock().lock();
596	>	Thread t = new Thread(new CheckedRunnable() {
597	>	public void realRun() {
598	>	threadAssertTrue(lock.readLock().tryLock());
599	>	lock.readLock().unlock();
600	>	}});
601	>
602	>	t.start();
603	>	t.join();
604	>	lock.readLock().unlock();
605	>	}
606	>
607	>
608	>
609	>	/**
610	>	* write tryLock fails when readlocked
611	>	*/
612	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
613	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
614	>	lock.readLock().lock();
615	>	Thread t = new Thread(new CheckedRunnable() {
616	>	public void realRun() {
617	>	threadAssertFalse(lock.writeLock().tryLock());
618	>	}});
619	>
620	>	t.start();
621	>	t.join();
622	>	lock.readLock().unlock();
623	>	}
624	>
625	>
626	>	/**
627	>	* Fair Read tryLock succeeds if readlocked but not writelocked
628	>	*/
629	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
630	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
631	>	lock.readLock().lock();
632	>	Thread t = new Thread(new CheckedRunnable() {
633	>	public void realRun() {
634	>	threadAssertTrue(lock.readLock().tryLock());
635	>	lock.readLock().unlock();
636	>	}});
637	>
638	>	t.start();
639	>	t.join();
640	>	lock.readLock().unlock();
641	>	}
642	>
643	>
644	>
645	>	/**
646	>	* Fair write tryLock fails when readlocked
647	>	*/
648	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
649	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
650	>	lock.readLock().lock();
651	>	Thread t = new Thread(new CheckedRunnable() {
652	>	public void realRun() {
653	>	threadAssertFalse(lock.writeLock().tryLock());
654	>	}});
655	>
656	>	t.start();
657	>	t.join();
658	>	lock.readLock().unlock();
659	>	}
660	>
661	>
662	>
663	>	/**
664	>	* write timed tryLock times out if locked
665	>	*/
666	>	public void testWriteTryLock_Timeout() throws InterruptedException {
667	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
668	>	lock.writeLock().lock();
669	>	Thread t = new Thread(new CheckedRunnable() {
670	>	public void realRun() throws InterruptedException {
671	>	threadAssertFalse(lock.writeLock().tryLock(1, MILLISECONDS));
672	>	}});
673	>
674	>	t.start();
675	>	t.join();
676	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
677	>	lock.writeLock().unlock();
678	>	}
679	>
680	>	/**
681	>	* read timed tryLock times out if write-locked
682	>	*/
683	>	public void testReadTryLock_Timeout() throws InterruptedException {
684	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
685	>	lock.writeLock().lock();
686	>	Thread t = new Thread(new CheckedRunnable() {
687	>	public void realRun() throws InterruptedException {
688	>	threadAssertFalse(lock.readLock().tryLock(1, MILLISECONDS));
689	>	}});
690	>
691	>	t.start();
692	>	t.join();
693	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
694	>	lock.writeLock().unlock();
695	>	}
696
697
698		/**
699		* write lockInterruptibly succeeds if lock free else is interruptible
700		*/
701	<	public void testWriteLockInterruptibly() {
702	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
703	<	try {
704	<	lock.writeLock().lockInterruptibly();
705	<	} catch(Exception e) {
706	<	unexpectedException();
707	<	}
708	<	Thread t = new Thread(new Runnable() {
709	<	public void run() {
710	<	try {
711	<	lock.writeLock().lockInterruptibly();
712	<	threadShouldThrow();
713	<	}
714	<	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	<	}
701	>	public void testWriteLockInterruptibly() throws InterruptedException {
702	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
703	>	lock.writeLock().lockInterruptibly();
704	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
705	>	public void realRun() throws InterruptedException {
706	>	lock.writeLock().lockInterruptibly();
707	>	}});
708	>
709	>	t.start();
710	>	Thread.sleep(SHORT_DELAY_MS);
711	>	t.interrupt();
712	>	Thread.sleep(SHORT_DELAY_MS);
713	>	t.join();
714	>	lock.writeLock().unlock();
715		}
716
717		/**
718		*  read lockInterruptibly succeeds if lock free else is interruptible
719		*/
720	<	public void testReadLockInterruptibly() {
721	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
722	<	try {
723	<	lock.writeLock().lockInterruptibly();
724	<	} catch(Exception e) {
725	<	unexpectedException();
726	<	}
727	<	Thread t = new Thread(new Runnable() {
728	<	public void run() {
729	<	try {
730	<	lock.readLock().lockInterruptibly();
731	<	threadShouldThrow();
732	<	}
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	<	}
720	>	public void testReadLockInterruptibly() throws InterruptedException {
721	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
722	>	lock.writeLock().lockInterruptibly();
723	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
724	>	public void realRun() throws InterruptedException {
725	>	lock.readLock().lockInterruptibly();
726	>	}});
727	>
728	>	t.start();
729	>	Thread.sleep(SHORT_DELAY_MS);
730	>	t.interrupt();
731	>	t.join();
732	>	lock.writeLock().unlock();
733		}
734
735		/**
736		* Calling await without holding lock throws IllegalMonitorStateException
737		*/
738	<	public void testAwait_IllegalMonitor() {
739	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
738	>	public void testAwait_IllegalMonitor() throws InterruptedException {
739	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
740		final Condition c = lock.writeLock().newCondition();
741		try {
742		c.await();
743		shouldThrow();
744	<	}
447	<	catch (IllegalMonitorStateException success) {
448	<	}
449	<	catch (Exception ex) {
450	<	shouldThrow();
451	<	}
744	>	} catch (IllegalMonitorStateException success) {}
745		}
746
747		/**
748		* Calling signal without holding lock throws IllegalMonitorStateException
749		*/
750		public void testSignal_IllegalMonitor() {
751	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
751	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
752		final Condition c = lock.writeLock().newCondition();
753		try {
754		c.signal();
755		shouldThrow();
756	<	}
464	<	catch (IllegalMonitorStateException success) {
465	<	}
466	<	catch (Exception ex) {
467	<	unexpectedException();
468	<	}
756	>	} catch (IllegalMonitorStateException success) {}
757		}
758
759		/**
760		* awaitNanos without a signal times out
761		*/
762	<	public void testAwaitNanos_Timeout() {
763	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
762	>	public void testAwaitNanos_Timeout() throws InterruptedException {
763	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
764		final Condition c = lock.writeLock().newCondition();
765	<	try {
766	<	lock.writeLock().lock();
767	<	long t = c.awaitNanos(100);
768	<	assertTrue(t <= 0);
769	<	lock.writeLock().unlock();
482	<	}
483	<	catch (Exception ex) {
484	<	unexpectedException();
485	<	}
765	>
766	>	lock.writeLock().lock();
767	>	long t = c.awaitNanos(100);
768	>	assertTrue(t <= 0);
769	>	lock.writeLock().unlock();
770		}
771
772
773		/**
774		*  timed await without a signal times out
775		*/
776	<	public void testAwait_Timeout() {
777	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
776	>	public void testAwait_Timeout() throws InterruptedException {
777	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
778		final Condition c = lock.writeLock().newCondition();
779	<	try {
780	<	lock.writeLock().lock();
781	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
498	<	lock.writeLock().unlock();
499	<	}
500	<	catch (Exception ex) {
501	<	unexpectedException();
502	<	}
779	>	lock.writeLock().lock();
780	>	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
781	>	lock.writeLock().unlock();
782		}
783
784		/**
785		* awaitUntil without a signal times out
786		*/
787	<	public void testAwaitUntil_Timeout() {
788	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
787	>	public void testAwaitUntil_Timeout() throws InterruptedException {
788	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
789		final Condition c = lock.writeLock().newCondition();
790	<	try {
791	<	lock.writeLock().lock();
792	<	java.util.Date d = new java.util.Date();
793	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
515	<	lock.writeLock().unlock();
516	<	}
517	<	catch (Exception ex) {
518	<	unexpectedException();
519	<	}
790	>	lock.writeLock().lock();
791	>	java.util.Date d = new java.util.Date();
792	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
793	>	lock.writeLock().unlock();
794		}
795
796		/**
797		* await returns when signalled
798		*/
799	<	public void testAwait() {
800	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
799	>	public void testAwait() throws InterruptedException {
800	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
801		final Condition c = lock.writeLock().newCondition();
802	<	Thread t = new Thread(new Runnable() {
803	<	public void run() {
804	<	try {
805	<	lock.writeLock().lock();
806	<	c.await();
807	<	lock.writeLock().unlock();
808	<	}
809	<	catch(InterruptedException e) {
810	<	threadUnexpectedException();
811	<	}
812	<	}
813	<	});
802	>	Thread t = new Thread(new CheckedRunnable() {
803	>	public void realRun() throws InterruptedException {
804	>	lock.writeLock().lock();
805	>	c.await();
806	>	lock.writeLock().unlock();
807	>	}});
808	>
809	>	t.start();
810	>	Thread.sleep(SHORT_DELAY_MS);
811	>	lock.writeLock().lock();
812	>	c.signal();
813	>	lock.writeLock().unlock();
814	>	t.join(SHORT_DELAY_MS);
815	>	assertFalse(t.isAlive());
816	>	}
817	>
818	>	/** A helper class for uninterruptible wait tests */
819	>	class UninterruptableThread extends Thread {
820	>	private Lock lock;
821	>	private Condition c;
822	>
823	>	public volatile boolean canAwake = false;
824	>	public volatile boolean interrupted = false;
825	>	public volatile boolean lockStarted = false;
826	>
827	>	public UninterruptableThread(Lock lock, Condition c) {
828	>	this.lock = lock;
829	>	this.c = c;
830	>	}
831	>
832	>	public synchronized void run() {
833	>	lock.lock();
834	>	lockStarted = true;
835	>
836	>	while (!canAwake) {
837	>	c.awaitUninterruptibly();
838	>	}
839
840	<	try {
841	<	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();
840	>	interrupted = isInterrupted();
841	>	lock.unlock();
842		}
843		}
844
845		/**
846		* awaitUninterruptibly doesn't abort on interrupt
847		*/
848	<	public void testAwaitUninterruptibly() {
849	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
848	>	public void testAwaitUninterruptibly() throws InterruptedException {
849	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
850		final Condition c = lock.writeLock().newCondition();
851	<	Thread t = new Thread(new Runnable() {
852	<	public void run() {
853	<	lock.writeLock().lock();
854	<	c.awaitUninterruptibly();
855	<	lock.writeLock().unlock();
856	<	}
857	<	});
851	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
852	>
853	>	thread.start();
854	>
855	>	while (!thread.lockStarted) {
856	>	Thread.sleep(100);
857	>	}
858
859	+	lock.writeLock().lock();
860		try {
861	<	t.start();
862	<	Thread.sleep(SHORT_DELAY_MS);
572	<	t.interrupt();
573	<	lock.writeLock().lock();
861	>	thread.interrupt();
862	>	thread.canAwake = true;
863		c.signal();
864	+	} finally {
865		lock.writeLock().unlock();
576	–	assert(t.isInterrupted());
577	–	t.join(SHORT_DELAY_MS);
578	–	assertFalse(t.isAlive());
579	–	}
580	–	catch (Exception ex) {
581	–	unexpectedException();
866		}
867	+
868	+	thread.join();
869	+	assertTrue(thread.interrupted);
870	+	assertFalse(thread.isAlive());
871		}
872
873		/**
874		* await is interruptible
875		*/
876	<	public void testAwait_Interrupt() {
877	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
876	>	public void testAwait_Interrupt() throws InterruptedException {
877	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
878		final Condition c = lock.writeLock().newCondition();
879	<	Thread t = new Thread(new Runnable() {
880	<	public void run() {
881	<	try {
882	<	lock.writeLock().lock();
883	<	c.await();
884	<	lock.writeLock().unlock();
885	<	threadShouldThrow();
886	<	}
887	<	catch(InterruptedException success) {
888	<	}
889	<	}
890	<	});
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	<	}
879	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
880	>	public void realRun() throws InterruptedException {
881	>	lock.writeLock().lock();
882	>	c.await();
883	>	lock.writeLock().unlock();
884	>	}});
885	>
886	>	t.start();
887	>	Thread.sleep(SHORT_DELAY_MS);
888	>	t.interrupt();
889	>	t.join(SHORT_DELAY_MS);
890	>	assertFalse(t.isAlive());
891		}
892
893		/**
894		* awaitNanos is interruptible
895		*/
896	<	public void testAwaitNanos_Interrupt() {
897	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
896	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
897	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
898		final Condition c = lock.writeLock().newCondition();
899	<	Thread t = new Thread(new Runnable() {
900	<	public void run() {
901	<	try {
902	<	lock.writeLock().lock();
903	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
904	<	lock.writeLock().unlock();
905	<	threadShouldThrow();
906	<	}
907	<	catch(InterruptedException success) {
908	<	}
909	<	}
910	<	});
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	<	}
899	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
900	>	public void realRun() throws InterruptedException {
901	>	lock.writeLock().lock();
902	>	c.awaitNanos(LONG_DELAY_MS * 1000L * 1000L);
903	>	lock.writeLock().unlock();
904	>	}});
905	>
906	>	t.start();
907	>	Thread.sleep(SHORT_DELAY_MS);
908	>	t.interrupt();
909	>	t.join(SHORT_DELAY_MS);
910	>	assertFalse(t.isAlive());
911		}
912
913		/**
914		* awaitUntil is interruptible
915		*/
916	<	public void testAwaitUntil_Interrupt() {
917	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
916	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
917	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
918		final Condition c = lock.writeLock().newCondition();
919	<	Thread t = new Thread(new Runnable() {
920	<	public void run() {
921	<	try {
922	<	lock.writeLock().lock();
923	<	java.util.Date d = new java.util.Date();
924	<	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
925	<	lock.writeLock().unlock();
926	<	threadShouldThrow();
927	<	}
928	<	catch(InterruptedException success) {
929	<	}
930	<	}
931	<	});
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	<	}
919	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
920	>	public void realRun() throws InterruptedException {
921	>	lock.writeLock().lock();
922	>	java.util.Date d = new java.util.Date();
923	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
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		* signalAll wakes up all threads
936		*/
937	<	public void testSignalAll() {
938	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
937	>	public void testSignalAll() throws InterruptedException {
938	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
939		final Condition c = lock.writeLock().newCondition();
940	<	Thread t1 = new Thread(new Runnable() {
941	<	public void run() {
942	<	try {
943	<	lock.writeLock().lock();
944	<	c.await();
945	<	lock.writeLock().unlock();
946	<	}
947	<	catch(InterruptedException e) {
948	<	threadUnexpectedException();
949	<	}
950	<	}
951	<	});
952	<
953	<	Thread t2 = new Thread(new Runnable() {
954	<	public void run() {
955	<	try {
956	<	lock.writeLock().lock();
957	<	c.await();
958	<	lock.writeLock().unlock();
959	<	}
960	<	catch(InterruptedException e) {
961	<	threadUnexpectedException();
962	<	}
963	<	}
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	<	}
940	>	Thread t1 = new Thread(new CheckedRunnable() {
941	>	public void realRun() throws InterruptedException {
942	>	lock.writeLock().lock();
943	>	c.await();
944	>	lock.writeLock().unlock();
945	>	}});
946	>
947	>	Thread t2 = new Thread(new CheckedRunnable() {
948	>	public void realRun() throws InterruptedException {
949	>	lock.writeLock().lock();
950	>	c.await();
951	>	lock.writeLock().unlock();
952	>	}});
953	>
954	>	t1.start();
955	>	t2.start();
956	>	Thread.sleep(SHORT_DELAY_MS);
957	>	lock.writeLock().lock();
958	>	c.signalAll();
959	>	lock.writeLock().unlock();
960	>	t1.join(SHORT_DELAY_MS);
961	>	t2.join(SHORT_DELAY_MS);
962	>	assertFalse(t1.isAlive());
963	>	assertFalse(t2.isAlive());
964		}
965
966		/**
967		* A serialized lock deserializes as unlocked
968		*/
969	<	public void testSerialization() {
969	>	public void testSerialization() throws Exception {
970		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
971		l.readLock().lock();
972		l.readLock().unlock();
973
974	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
975	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
976	+	out.writeObject(l);
977	+	out.close();
978	+
979	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
980	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
981	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
982	+	r.readLock().lock();
983	+	r.readLock().unlock();
984	+	}
985	+
986	+	/**
987	+	* hasQueuedThreads reports whether there are waiting threads
988	+	*/
989	+	public void testhasQueuedThreads() throws InterruptedException {
990	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
991	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
992	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
993	+	assertFalse(lock.hasQueuedThreads());
994	+	lock.writeLock().lock();
995	+	t1.start();
996	+	Thread.sleep(SHORT_DELAY_MS);
997	+	assertTrue(lock.hasQueuedThreads());
998	+	t2.start();
999	+	Thread.sleep(SHORT_DELAY_MS);
1000	+	assertTrue(lock.hasQueuedThreads());
1001	+	t1.interrupt();
1002	+	Thread.sleep(SHORT_DELAY_MS);
1003	+	assertTrue(lock.hasQueuedThreads());
1004	+	lock.writeLock().unlock();
1005	+	Thread.sleep(SHORT_DELAY_MS);
1006	+	assertFalse(lock.hasQueuedThreads());
1007	+	t1.join();
1008	+	t2.join();
1009	+	}
1010	+
1011	+	/**
1012	+	* hasQueuedThread(null) throws NPE
1013	+	*/
1014	+	public void testHasQueuedThreadNPE() {
1015	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1016		try {
1017	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1018	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1019	<	out.writeObject(l);
1020	<	out.close();
1021	<
1022	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1023	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1024	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1025	<	r.readLock().lock();
1026	<	r.readLock().unlock();
1027	<	} catch(Exception e){
1028	<	e.printStackTrace();
1029	<	unexpectedException();
1030	<	}
1017	>	sync.hasQueuedThread(null);
1018	>	shouldThrow();
1019	>	} catch (NullPointerException success) {}
1020	>	}
1021	>
1022	>	/**
1023	>	* hasQueuedThread reports whether a thread is queued.
1024	>	*/
1025	>	public void testHasQueuedThread() throws InterruptedException {
1026	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1027	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1028	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1029	>	assertFalse(sync.hasQueuedThread(t1));
1030	>	assertFalse(sync.hasQueuedThread(t2));
1031	>	sync.writeLock().lock();
1032	>	t1.start();
1033	>	Thread.sleep(SHORT_DELAY_MS);
1034	>	assertTrue(sync.hasQueuedThread(t1));
1035	>	t2.start();
1036	>	Thread.sleep(SHORT_DELAY_MS);
1037	>	assertTrue(sync.hasQueuedThread(t1));
1038	>	assertTrue(sync.hasQueuedThread(t2));
1039	>	t1.interrupt();
1040	>	Thread.sleep(SHORT_DELAY_MS);
1041	>	assertFalse(sync.hasQueuedThread(t1));
1042	>	assertTrue(sync.hasQueuedThread(t2));
1043	>	sync.writeLock().unlock();
1044	>	Thread.sleep(SHORT_DELAY_MS);
1045	>	assertFalse(sync.hasQueuedThread(t1));
1046	>	Thread.sleep(SHORT_DELAY_MS);
1047	>	assertFalse(sync.hasQueuedThread(t2));
1048	>	t1.join();
1049	>	t2.join();
1050	>	}
1051	>
1052	>
1053	>	/**
1054	>	* getQueueLength reports number of waiting threads
1055	>	*/
1056	>	public void testGetQueueLength() throws InterruptedException {
1057	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1058	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1059	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1060	>	assertEquals(0, lock.getQueueLength());
1061	>	lock.writeLock().lock();
1062	>	t1.start();
1063	>	Thread.sleep(SHORT_DELAY_MS);
1064	>	assertEquals(1, lock.getQueueLength());
1065	>	t2.start();
1066	>	Thread.sleep(SHORT_DELAY_MS);
1067	>	assertEquals(2, lock.getQueueLength());
1068	>	t1.interrupt();
1069	>	Thread.sleep(SHORT_DELAY_MS);
1070	>	assertEquals(1, lock.getQueueLength());
1071	>	lock.writeLock().unlock();
1072	>	Thread.sleep(SHORT_DELAY_MS);
1073	>	assertEquals(0, lock.getQueueLength());
1074	>	t1.join();
1075	>	t2.join();
1076	>	}
1077	>
1078	>	/**
1079	>	* getQueuedThreads includes waiting threads
1080	>	*/
1081	>	public void testGetQueuedThreads() throws InterruptedException {
1082	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1083	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1084	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1085	>	assertTrue(lock.getQueuedThreads().isEmpty());
1086	>	lock.writeLock().lock();
1087	>	assertTrue(lock.getQueuedThreads().isEmpty());
1088	>	t1.start();
1089	>	Thread.sleep(SHORT_DELAY_MS);
1090	>	assertTrue(lock.getQueuedThreads().contains(t1));
1091	>	t2.start();
1092	>	Thread.sleep(SHORT_DELAY_MS);
1093	>	assertTrue(lock.getQueuedThreads().contains(t1));
1094	>	assertTrue(lock.getQueuedThreads().contains(t2));
1095	>	t1.interrupt();
1096	>	Thread.sleep(SHORT_DELAY_MS);
1097	>	assertFalse(lock.getQueuedThreads().contains(t1));
1098	>	assertTrue(lock.getQueuedThreads().contains(t2));
1099	>	lock.writeLock().unlock();
1100	>	Thread.sleep(SHORT_DELAY_MS);
1101	>	assertTrue(lock.getQueuedThreads().isEmpty());
1102	>	t1.join();
1103	>	t2.join();
1104		}
1105
1106	+	/**
1107	+	* hasWaiters throws NPE if null
1108	+	*/
1109	+	public void testHasWaitersNPE() {
1110	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1111	+	try {
1112	+	lock.hasWaiters(null);
1113	+	shouldThrow();
1114	+	} catch (NullPointerException success) {}
1115	+	}
1116	+
1117	+	/**
1118	+	* getWaitQueueLength throws NPE if null
1119	+	*/
1120	+	public void testGetWaitQueueLengthNPE() {
1121	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1122	+	try {
1123	+	lock.getWaitQueueLength(null);
1124	+	shouldThrow();
1125	+	} catch (NullPointerException success) {}
1126	+	}
1127	+
1128	+
1129	+	/**
1130	+	* getWaitingThreads throws NPE if null
1131	+	*/
1132	+	public void testGetWaitingThreadsNPE() {
1133	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1134	+	try {
1135	+	lock.getWaitingThreads(null);
1136	+	shouldThrow();
1137	+	} catch (NullPointerException success) {}
1138	+	}
1139	+
1140	+	/**
1141	+	* hasWaiters throws IAE if not owned
1142	+	*/
1143	+	public void testHasWaitersIAE() {
1144	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1145	+	final Condition c = lock.writeLock().newCondition();
1146	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1147	+	try {
1148	+	lock2.hasWaiters(c);
1149	+	shouldThrow();
1150	+	} catch (IllegalArgumentException success) {}
1151	+	}
1152	+
1153	+	/**
1154	+	* hasWaiters throws IMSE if not locked
1155	+	*/
1156	+	public void testHasWaitersIMSE() {
1157	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1158	+	final Condition c = lock.writeLock().newCondition();
1159	+	try {
1160	+	lock.hasWaiters(c);
1161	+	shouldThrow();
1162	+	} catch (IllegalMonitorStateException success) {}
1163	+	}
1164	+
1165	+
1166	+	/**
1167	+	* getWaitQueueLength throws IAE if not owned
1168	+	*/
1169	+	public void testGetWaitQueueLengthIAE() {
1170	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1171	+	final Condition c = lock.writeLock().newCondition();
1172	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1173	+	try {
1174	+	lock2.getWaitQueueLength(c);
1175	+	shouldThrow();
1176	+	} catch (IllegalArgumentException success) {}
1177	+	}
1178	+
1179	+	/**
1180	+	* getWaitQueueLength throws IMSE if not locked
1181	+	*/
1182	+	public void testGetWaitQueueLengthIMSE() {
1183	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1184	+	final Condition c = lock.writeLock().newCondition();
1185	+	try {
1186	+	lock.getWaitQueueLength(c);
1187	+	shouldThrow();
1188	+	} catch (IllegalMonitorStateException success) {}
1189	+	}
1190	+
1191	+
1192	+	/**
1193	+	* getWaitingThreads throws IAE if not owned
1194	+	*/
1195	+	public void testGetWaitingThreadsIAE() {
1196	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1197	+	final Condition c = lock.writeLock().newCondition();
1198	+	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1199	+	try {
1200	+	lock2.getWaitingThreads(c);
1201	+	shouldThrow();
1202	+	} catch (IllegalArgumentException success) {}
1203	+	}
1204	+
1205	+	/**
1206	+	* getWaitingThreads throws IMSE if not locked
1207	+	*/
1208	+	public void testGetWaitingThreadsIMSE() {
1209	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1210	+	final Condition c = lock.writeLock().newCondition();
1211	+	try {
1212	+	lock.getWaitingThreads(c);
1213	+	shouldThrow();
1214	+	} catch (IllegalMonitorStateException success) {}
1215	+	}
1216	+
1217	+
1218	+	/**
1219	+	* hasWaiters returns true when a thread is waiting, else false
1220	+	*/
1221	+	public void testHasWaiters() throws InterruptedException {
1222	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1223	+	final Condition c = lock.writeLock().newCondition();
1224	+	Thread t = new Thread(new CheckedRunnable() {
1225	+	public void realRun() throws InterruptedException {
1226	+	lock.writeLock().lock();
1227	+	threadAssertFalse(lock.hasWaiters(c));
1228	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1229	+	c.await();
1230	+	lock.writeLock().unlock();
1231	+	}});
1232	+
1233	+	t.start();
1234	+	Thread.sleep(SHORT_DELAY_MS);
1235	+	lock.writeLock().lock();
1236	+	assertTrue(lock.hasWaiters(c));
1237	+	assertEquals(1, lock.getWaitQueueLength(c));
1238	+	c.signal();
1239	+	lock.writeLock().unlock();
1240	+	Thread.sleep(SHORT_DELAY_MS);
1241	+	lock.writeLock().lock();
1242	+	assertFalse(lock.hasWaiters(c));
1243	+	assertEquals(0, lock.getWaitQueueLength(c));
1244	+	lock.writeLock().unlock();
1245	+	t.join(SHORT_DELAY_MS);
1246	+	assertFalse(t.isAlive());
1247	+	}
1248	+
1249	+	/**
1250	+	* getWaitQueueLength returns number of waiting threads
1251	+	*/
1252	+	public void testGetWaitQueueLength() throws InterruptedException {
1253	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1254	+	final Condition c = lock.writeLock().newCondition();
1255	+	Thread t = new Thread(new CheckedRunnable() {
1256	+	public void realRun() throws InterruptedException {
1257	+	lock.writeLock().lock();
1258	+	threadAssertFalse(lock.hasWaiters(c));
1259	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1260	+	c.await();
1261	+	lock.writeLock().unlock();
1262	+	}});
1263	+
1264	+	t.start();
1265	+	Thread.sleep(SHORT_DELAY_MS);
1266	+	lock.writeLock().lock();
1267	+	assertTrue(lock.hasWaiters(c));
1268	+	assertEquals(1, lock.getWaitQueueLength(c));
1269	+	c.signal();
1270	+	lock.writeLock().unlock();
1271	+	Thread.sleep(SHORT_DELAY_MS);
1272	+	lock.writeLock().lock();
1273	+	assertFalse(lock.hasWaiters(c));
1274	+	assertEquals(0, lock.getWaitQueueLength(c));
1275	+	lock.writeLock().unlock();
1276	+	t.join(SHORT_DELAY_MS);
1277	+	assertFalse(t.isAlive());
1278	+	}
1279	+
1280	+
1281	+	/**
1282	+	* getWaitingThreads returns only and all waiting threads
1283	+	*/
1284	+	public void testGetWaitingThreads() throws InterruptedException {
1285	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1286	+	final Condition c = lock.writeLock().newCondition();
1287	+	Thread t1 = new Thread(new CheckedRunnable() {
1288	+	public void realRun() throws InterruptedException {
1289	+	lock.writeLock().lock();
1290	+	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1291	+	c.await();
1292	+	lock.writeLock().unlock();
1293	+	}});
1294	+
1295	+	Thread t2 = new Thread(new CheckedRunnable() {
1296	+	public void realRun() throws InterruptedException {
1297	+	lock.writeLock().lock();
1298	+	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1299	+	c.await();
1300	+	lock.writeLock().unlock();
1301	+	}});
1302	+
1303	+	lock.writeLock().lock();
1304	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1305	+	lock.writeLock().unlock();
1306	+	t1.start();
1307	+	Thread.sleep(SHORT_DELAY_MS);
1308	+	t2.start();
1309	+	Thread.sleep(SHORT_DELAY_MS);
1310	+	lock.writeLock().lock();
1311	+	assertTrue(lock.hasWaiters(c));
1312	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1313	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1314	+	c.signalAll();
1315	+	lock.writeLock().unlock();
1316	+	Thread.sleep(SHORT_DELAY_MS);
1317	+	lock.writeLock().lock();
1318	+	assertFalse(lock.hasWaiters(c));
1319	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1320	+	lock.writeLock().unlock();
1321	+	t1.join(SHORT_DELAY_MS);
1322	+	t2.join(SHORT_DELAY_MS);
1323	+	assertFalse(t1.isAlive());
1324	+	assertFalse(t2.isAlive());
1325	+	}
1326	+
1327	+	/**
1328	+	* toString indicates current lock state
1329	+	*/
1330	+	public void testToString() {
1331	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1332	+	String us = lock.toString();
1333	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1334	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1335	+	lock.writeLock().lock();
1336	+	String ws = lock.toString();
1337	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1338	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1339	+	lock.writeLock().unlock();
1340	+	lock.readLock().lock();
1341	+	lock.readLock().lock();
1342	+	String rs = lock.toString();
1343	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1344	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1345	+	}
1346	+
1347	+	/**
1348	+	* readLock.toString indicates current lock state
1349	+	*/
1350	+	public void testReadLockToString() {
1351	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1352	+	String us = lock.readLock().toString();
1353	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1354	+	lock.readLock().lock();
1355	+	lock.readLock().lock();
1356	+	String rs = lock.readLock().toString();
1357	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1358	+	}
1359	+
1360	+	/**
1361	+	* writeLock.toString indicates current lock state
1362	+	*/
1363	+	public void testWriteLockToString() {
1364	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1365	+	String us = lock.writeLock().toString();
1366	+	assertTrue(us.indexOf("Unlocked") >= 0);
1367	+	lock.writeLock().lock();
1368	+	String ls = lock.writeLock().toString();
1369	+	assertTrue(ls.indexOf("Locked") >= 0);
1370	+	}
1371
1372		}

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