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Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.4 by dl, Sat Sep 20 18:20:08 2003 UTC vs.
Revision 1.37 by jsr166, Sat Nov 21 10:25:05 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	<	/*
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();
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(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 testWriteAfterMultipleReadLocks() {
231	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
232	<	lock.readLock().lock();
233	<	Thread t1 = new Thread(new Runnable() {
234	<	public void run() {
235	<	lock.readLock().lock();
236	<	lock.readLock().unlock();
237	<	}
238	<	});
239	<	Thread t2 = new Thread(new Runnable() {
240	<	public void run() {
241	<	lock.writeLock().lock();
242	<	lock.writeLock().unlock();
243	<	}
244	<	});
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	<	}
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
246		/**
247	<	* Readlocks succeed after a writing thread unlocks
247	>	* timed read-tryLock is interruptible
248		*/
249	<	public void testReadAfterWriteLock() {
250	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
251	<	lock.writeLock().lock();
252	<	Thread t1 = new Thread(new Runnable() {
253	<	public void run() {
254	<	lock.readLock().lock();
255	<	lock.readLock().unlock();
256	<	}
257	<	});
258	<	Thread t2 = new Thread(new Runnable() {
259	<	public void run() {
260	<	lock.readLock().lock();
263	<	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	<	}
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	<	* Read trylock succeeds if readlocked but not writelocked
265	<	*/
266	<	public void testTryLockWhenReadLocked() {
267	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
268	<	lock.readLock().lock();
269	<	Thread t = new Thread(new Runnable() {
270	<	public void run() {
271	<	threadAssertTrue(lock.readLock().tryLock());
272	<	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	<	}
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 CheckedRunnable() {
270	>	public void realRun() {
271	>	threadAssertFalse(lock.writeLock().tryLock());
272	>	}});
273
274	<
274	>	t.start();
275	>	t.join();
276	>	lock.writeLock().unlock();
277	>	}
278
279		/**
280	<	* write trylock fails when readlocked
280	>	* read-tryLock fails if locked
281		*/
282	<	public void testWriteTryLockWhenReadLocked() {
283	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
284	<	lock.readLock().lock();
285	<	Thread t = new Thread(new Runnable() {
286	<	public void run() {
287	<	threadAssertFalse(lock.writeLock().tryLock());
288	<	}
316	<	});
317	<	try {
318	<	t.start();
319	<	t.join();
320	<	lock.readLock().unlock();
321	<	} catch(Exception e){
322	<	unexpectedException();
323	<	}
324	<	}
282	>	public void testReadTryLockWhenLocked() throws InterruptedException {
283	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
284	>	lock.writeLock().lock();
285	>	Thread t = new Thread(new CheckedRunnable() {
286	>	public void realRun() {
287	>	threadAssertFalse(lock.readLock().tryLock());
288	>	}});
289
290	<
290	>	t.start();
291	>	t.join();
292	>	lock.writeLock().unlock();
293	>	}
294
295		/**
296	<	* write timed trylock times out if locked
297	<	*/
298	<	public void testWriteTryLock_Timeout() {
299	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
300	<	lock.writeLock().lock();
301	<	Thread t = new Thread(new Runnable() {
302	<	public void run() {
303	<	try {
304	<	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
305	<	} catch (Exception ex) {
306	<	threadUnexpectedException();
307	<	}
308	<	}
309	<	});
310	<	try {
344	<	t.start();
345	<	t.join();
346	<	lock.writeLock().unlock();
347	<	} catch(Exception e){
348	<	unexpectedException();
349	<	}
350	<	}
296	>	* Multiple threads can hold a read lock when not write-locked
297	>	*/
298	>	public void testMultipleReadLocks() throws InterruptedException {
299	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
300	>	lock.readLock().lock();
301	>	Thread t = new Thread(new CheckedRunnable() {
302	>	public void realRun() {
303	>	threadAssertTrue(lock.readLock().tryLock());
304	>	lock.readLock().unlock();
305	>	}});
306	>
307	>	t.start();
308	>	t.join();
309	>	lock.readLock().unlock();
310	>	}
311
312		/**
313	<	* read timed trylock times out if write-locked
313	>	* A writelock succeeds after reading threads unlock
314		*/
315	<	public void testReadTryLock_Timeout() {
316	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
317	<	lock.writeLock().lock();
318	<	Thread t = new Thread(new Runnable() {
319	<	public void run() {
320	<	try {
321	<	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
322	<	} catch (Exception ex) {
323	<	threadUnexpectedException();
324	<	}
325	<	}
326	<	});
327	<	try {
328	<	t.start();
329	<	t.join();
330	<	lock.writeLock().unlock();
331	<	} catch(Exception e){
332	<	unexpectedException();
333	<	}
334	<	}
315	>	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
316	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
317	>	lock.readLock().lock();
318	>	Thread t1 = new Thread(new CheckedRunnable() {
319	>	public void realRun() {
320	>	lock.readLock().lock();
321	>	lock.readLock().unlock();
322	>	}});
323	>	Thread t2 = new Thread(new CheckedRunnable() {
324	>	public void realRun() {
325	>	lock.writeLock().lock();
326	>	lock.writeLock().unlock();
327	>	}});
328	>
329	>	t1.start();
330	>	t2.start();
331	>	Thread.sleep(SHORT_DELAY_MS);
332	>	lock.readLock().unlock();
333	>	t1.join(MEDIUM_DELAY_MS);
334	>	t2.join(MEDIUM_DELAY_MS);
335	>	assertTrue(!t1.isAlive());
336	>	assertTrue(!t2.isAlive());
337	>	}
338	>
339	>	/**
340	>	* Readlocks succeed after a writing thread unlocks
341	>	*/
342	>	public void testReadAfterWriteLock() throws InterruptedException {
343	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
344	>	lock.writeLock().lock();
345	>	Thread t1 = new Thread(new CheckedRunnable() {
346	>	public void realRun() {
347	>	lock.readLock().lock();
348	>	lock.readLock().unlock();
349	>	}});
350	>	Thread t2 = new Thread(new CheckedRunnable() {
351	>	public void realRun() {
352	>	lock.readLock().lock();
353	>	lock.readLock().unlock();
354	>	}});
355	>
356	>	t1.start();
357	>	t2.start();
358	>	Thread.sleep(SHORT_DELAY_MS);
359	>	lock.writeLock().unlock();
360	>	t1.join(MEDIUM_DELAY_MS);
361	>	t2.join(MEDIUM_DELAY_MS);
362	>	assertTrue(!t1.isAlive());
363	>	assertTrue(!t2.isAlive());
364	>	}
365	>
366	>	/**
367	>	* Read trylock succeeds if write locked by current thread
368	>	*/
369	>	public void testReadHoldingWriteLock() {
370	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
371	>	lock.writeLock().lock();
372	>	assertTrue(lock.readLock().tryLock());
373	>	lock.readLock().unlock();
374	>	lock.writeLock().unlock();
375	>	}
376	>
377	>	/**
378	>	* Read lock succeeds if write locked by current thread even if
379	>	* other threads are waiting for readlock
380	>	*/
381	>	public void testReadHoldingWriteLock2() throws InterruptedException {
382	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
383	>	lock.writeLock().lock();
384	>	Thread t1 = new Thread(new CheckedRunnable() {
385	>	public void realRun() {
386	>	lock.readLock().lock();
387	>	lock.readLock().unlock();
388	>	}});
389	>	Thread t2 = new Thread(new CheckedRunnable() {
390	>	public void realRun() {
391	>	lock.readLock().lock();
392	>	lock.readLock().unlock();
393	>	}});
394	>
395	>	t1.start();
396	>	t2.start();
397	>	lock.readLock().lock();
398	>	lock.readLock().unlock();
399	>	Thread.sleep(SHORT_DELAY_MS);
400	>	lock.readLock().lock();
401	>	lock.readLock().unlock();
402	>	lock.writeLock().unlock();
403	>	t1.join(MEDIUM_DELAY_MS);
404	>	t2.join(MEDIUM_DELAY_MS);
405	>	assertTrue(!t1.isAlive());
406	>	assertTrue(!t2.isAlive());
407	>	}
408	>
409	>	/**
410	>	*  Read lock succeeds if write locked by current thread even if
411	>	* other threads are waiting for writelock
412	>	*/
413	>	public void testReadHoldingWriteLock3() throws InterruptedException {
414	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
415	>	lock.writeLock().lock();
416	>	Thread t1 = new Thread(new CheckedRunnable() {
417	>	public void realRun() {
418	>	lock.writeLock().lock();
419	>	lock.writeLock().unlock();
420	>	}});
421	>	Thread t2 = new Thread(new CheckedRunnable() {
422	>	public void realRun() {
423	>	lock.writeLock().lock();
424	>	lock.writeLock().unlock();
425	>	}});
426	>
427	>	t1.start();
428	>	t2.start();
429	>	lock.readLock().lock();
430	>	lock.readLock().unlock();
431	>	Thread.sleep(SHORT_DELAY_MS);
432	>	lock.readLock().lock();
433	>	lock.readLock().unlock();
434	>	lock.writeLock().unlock();
435	>	t1.join(MEDIUM_DELAY_MS);
436	>	t2.join(MEDIUM_DELAY_MS);
437	>	assertTrue(!t1.isAlive());
438	>	assertTrue(!t2.isAlive());
439	>	}
440	>
441	>
442	>	/**
443	>	*  Write lock succeeds if write locked by current thread even if
444	>	* other threads are waiting for writelock
445	>	*/
446	>	public void testWriteHoldingWriteLock4() throws InterruptedException {
447	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
448	>	lock.writeLock().lock();
449	>	Thread t1 = new Thread(new CheckedRunnable() {
450	>	public void realRun() {
451	>	lock.writeLock().lock();
452	>	lock.writeLock().unlock();
453	>	}});
454	>	Thread t2 = new Thread(new CheckedRunnable() {
455	>	public void realRun() {
456	>	lock.writeLock().lock();
457	>	lock.writeLock().unlock();
458	>	}});
459	>
460	>	t1.start();
461	>	t2.start();
462	>	lock.writeLock().lock();
463	>	lock.writeLock().unlock();
464	>	Thread.sleep(SHORT_DELAY_MS);
465	>	lock.writeLock().lock();
466	>	lock.writeLock().unlock();
467	>	lock.writeLock().unlock();
468	>	t1.join(MEDIUM_DELAY_MS);
469	>	t2.join(MEDIUM_DELAY_MS);
470	>	assertTrue(!t1.isAlive());
471	>	assertTrue(!t2.isAlive());
472	>	}
473	>
474	>
475	>	/**
476	>	* Fair Read trylock succeeds if write locked by current thread
477	>	*/
478	>	public void testReadHoldingWriteLockFair() {
479	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
480	>	lock.writeLock().lock();
481	>	assertTrue(lock.readLock().tryLock());
482	>	lock.readLock().unlock();
483	>	lock.writeLock().unlock();
484	>	}
485	>
486	>	/**
487	>	* Fair Read lock succeeds if write locked by current thread even if
488	>	* other threads are waiting for readlock
489	>	*/
490	>	public void testReadHoldingWriteLockFair2() throws InterruptedException {
491	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
492	>	lock.writeLock().lock();
493	>	Thread t1 = new Thread(new CheckedRunnable() {
494	>	public void realRun() {
495	>	lock.readLock().lock();
496	>	lock.readLock().unlock();
497	>	}});
498	>	Thread t2 = new Thread(new CheckedRunnable() {
499	>	public void realRun() {
500	>	lock.readLock().lock();
501	>	lock.readLock().unlock();
502	>	}});
503	>
504	>	t1.start();
505	>	t2.start();
506	>	lock.readLock().lock();
507	>	lock.readLock().unlock();
508	>	Thread.sleep(SHORT_DELAY_MS);
509	>	lock.readLock().lock();
510	>	lock.readLock().unlock();
511	>	lock.writeLock().unlock();
512	>	t1.join(MEDIUM_DELAY_MS);
513	>	t2.join(MEDIUM_DELAY_MS);
514	>	assertTrue(!t1.isAlive());
515	>	assertTrue(!t2.isAlive());
516	>	}
517	>
518	>
519	>	/**
520	>	* Fair Read lock succeeds if write locked by current thread even if
521	>	* other threads are waiting for writelock
522	>	*/
523	>	public void testReadHoldingWriteLockFair3() throws InterruptedException {
524	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
525	>	lock.writeLock().lock();
526	>	Thread t1 = new Thread(new CheckedRunnable() {
527	>	public void realRun() {
528	>	lock.writeLock().lock();
529	>	lock.writeLock().unlock();
530	>	}});
531	>	Thread t2 = new Thread(new CheckedRunnable() {
532	>	public void realRun() {
533	>	lock.writeLock().lock();
534	>	lock.writeLock().unlock();
535	>	}});
536	>
537	>	t1.start();
538	>	t2.start();
539	>	lock.readLock().lock();
540	>	lock.readLock().unlock();
541	>	Thread.sleep(SHORT_DELAY_MS);
542	>	lock.readLock().lock();
543	>	lock.readLock().unlock();
544	>	lock.writeLock().unlock();
545	>	t1.join(MEDIUM_DELAY_MS);
546	>	t2.join(MEDIUM_DELAY_MS);
547	>	assertTrue(!t1.isAlive());
548	>	assertTrue(!t2.isAlive());
549	>	}
550	>
551	>
552	>	/**
553	>	* Fair Write lock succeeds if write locked by current thread even if
554	>	* other threads are waiting for writelock
555	>	*/
556	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
557	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
558	>	lock.writeLock().lock();
559	>	Thread t1 = new Thread(new CheckedRunnable() {
560	>	public void realRun() {
561	>	lock.writeLock().lock();
562	>	lock.writeLock().unlock();
563	>	}});
564	>	Thread t2 = new Thread(new CheckedRunnable() {
565	>	public void realRun() {
566	>	lock.writeLock().lock();
567	>	lock.writeLock().unlock();
568	>	}});
569	>
570	>	t1.start();
571	>	t2.start();
572	>	Thread.sleep(SHORT_DELAY_MS);
573	>	assertTrue(lock.isWriteLockedByCurrentThread());
574	>	assertTrue(lock.getWriteHoldCount() == 1);
575	>	lock.writeLock().lock();
576	>	assertTrue(lock.getWriteHoldCount() == 2);
577	>	lock.writeLock().unlock();
578	>	lock.writeLock().lock();
579	>	lock.writeLock().unlock();
580	>	lock.writeLock().unlock();
581	>	t1.join(MEDIUM_DELAY_MS);
582	>	t2.join(MEDIUM_DELAY_MS);
583	>	assertTrue(!t1.isAlive());
584	>	assertTrue(!t2.isAlive());
585	>	}
586	>
587	>
588	>	/**
589	>	* Read tryLock succeeds if readlocked but not writelocked
590	>	*/
591	>	public void testTryLockWhenReadLocked() throws InterruptedException {
592	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
593	>	lock.readLock().lock();
594	>	Thread t = new Thread(new CheckedRunnable() {
595	>	public void realRun() {
596	>	threadAssertTrue(lock.readLock().tryLock());
597	>	lock.readLock().unlock();
598	>	}});
599	>
600	>	t.start();
601	>	t.join();
602	>	lock.readLock().unlock();
603	>	}
604	>
605	>
606	>
607	>	/**
608	>	* write tryLock fails when readlocked
609	>	*/
610	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
611	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
612	>	lock.readLock().lock();
613	>	Thread t = new Thread(new CheckedRunnable() {
614	>	public void realRun() {
615	>	threadAssertFalse(lock.writeLock().tryLock());
616	>	}});
617	>
618	>	t.start();
619	>	t.join();
620	>	lock.readLock().unlock();
621	>	}
622	>
623	>
624	>	/**
625	>	* Fair Read tryLock succeeds if readlocked but not writelocked
626	>	*/
627	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
628	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
629	>	lock.readLock().lock();
630	>	Thread t = new Thread(new CheckedRunnable() {
631	>	public void realRun() {
632	>	threadAssertTrue(lock.readLock().tryLock());
633	>	lock.readLock().unlock();
634	>	}});
635	>
636	>	t.start();
637	>	t.join();
638	>	lock.readLock().unlock();
639	>	}
640	>
641	>
642	>
643	>	/**
644	>	* Fair write tryLock fails when readlocked
645	>	*/
646	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
647	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
648	>	lock.readLock().lock();
649	>	Thread t = new Thread(new CheckedRunnable() {
650	>	public void realRun() {
651	>	threadAssertFalse(lock.writeLock().tryLock());
652	>	}});
653	>
654	>	t.start();
655	>	t.join();
656	>	lock.readLock().unlock();
657	>	}
658	>
659	>
660	>
661	>	/**
662	>	* write timed tryLock times out if locked
663	>	*/
664	>	public void testWriteTryLock_Timeout() throws InterruptedException {
665	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
666	>	lock.writeLock().lock();
667	>	Thread t = new Thread(new CheckedRunnable() {
668	>	public void realRun() throws InterruptedException {
669	>	threadAssertFalse(lock.writeLock().tryLock(1, MILLISECONDS));
670	>	}});
671	>
672	>	t.start();
673	>	t.join();
674	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
675	>	lock.writeLock().unlock();
676	>	}
677	>
678	>	/**
679	>	* read timed tryLock times out if write-locked
680	>	*/
681	>	public void testReadTryLock_Timeout() throws InterruptedException {
682	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
683	>	lock.writeLock().lock();
684	>	Thread t = new Thread(new CheckedRunnable() {
685	>	public void realRun() throws InterruptedException {
686	>	threadAssertFalse(lock.readLock().tryLock(1, MILLISECONDS));
687	>	}});
688	>
689	>	t.start();
690	>	t.join();
691	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
692	>	lock.writeLock().unlock();
693	>	}
694
695
696		/**
697		* write lockInterruptibly succeeds if lock free else is interruptible
698		*/
699	<	public void testWriteLockInterruptibly() {
700	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
701	<	try {
702	<	lock.writeLock().lockInterruptibly();
703	<	} catch(Exception e) {
704	<	unexpectedException();
705	<	}
706	<	Thread t = new Thread(new Runnable() {
707	<	public void run() {
708	<	try {
709	<	lock.writeLock().lockInterruptibly();
710	<	threadShouldThrow();
711	<	}
712	<	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	<	}
699	>	public void testWriteLockInterruptibly() throws InterruptedException {
700	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
701	>	lock.writeLock().lockInterruptibly();
702	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
703	>	public void realRun() throws InterruptedException {
704	>	lock.writeLock().lockInterruptibly();
705	>	}});
706	>
707	>	t.start();
708	>	Thread.sleep(SHORT_DELAY_MS);
709	>	t.interrupt();
710	>	Thread.sleep(SHORT_DELAY_MS);
711	>	t.join();
712	>	lock.writeLock().unlock();
713		}
714
715		/**
716		*  read lockInterruptibly succeeds if lock free else is interruptible
717		*/
718	<	public void testReadLockInterruptibly() {
719	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
720	<	try {
721	<	lock.writeLock().lockInterruptibly();
722	<	} catch(Exception e) {
723	<	unexpectedException();
724	<	}
725	<	Thread t = new Thread(new Runnable() {
726	<	public void run() {
727	<	try {
728	<	lock.readLock().lockInterruptibly();
729	<	threadShouldThrow();
730	<	}
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	<	}
718	>	public void testReadLockInterruptibly() throws InterruptedException {
719	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
720	>	lock.writeLock().lockInterruptibly();
721	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
722	>	public void realRun() throws InterruptedException {
723	>	lock.readLock().lockInterruptibly();
724	>	}});
725	>
726	>	t.start();
727	>	Thread.sleep(SHORT_DELAY_MS);
728	>	t.interrupt();
729	>	t.join();
730	>	lock.writeLock().unlock();
731		}
732
733		/**
734		* Calling await without holding lock throws IllegalMonitorStateException
735		*/
736	<	public void testAwait_IllegalMonitor() {
737	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
736	>	public void testAwait_IllegalMonitor() throws InterruptedException {
737	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
738		final Condition c = lock.writeLock().newCondition();
739		try {
740		c.await();
741		shouldThrow();
742	<	}
447	<	catch (IllegalMonitorStateException success) {
448	<	}
449	<	catch (Exception ex) {
450	<	shouldThrow();
451	<	}
742	>	} catch (IllegalMonitorStateException success) {}
743		}
744
745		/**
746		* Calling signal without holding lock throws IllegalMonitorStateException
747		*/
748		public void testSignal_IllegalMonitor() {
749	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
749	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
750		final Condition c = lock.writeLock().newCondition();
751		try {
752		c.signal();
753		shouldThrow();
754	<	}
464	<	catch (IllegalMonitorStateException success) {
465	<	}
466	<	catch (Exception ex) {
467	<	unexpectedException();
468	<	}
754	>	} catch (IllegalMonitorStateException success) {}
755		}
756
757		/**
758		* awaitNanos without a signal times out
759		*/
760	<	public void testAwaitNanos_Timeout() {
761	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
760	>	public void testAwaitNanos_Timeout() throws InterruptedException {
761	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
762		final Condition c = lock.writeLock().newCondition();
763	<	try {
764	<	lock.writeLock().lock();
765	<	long t = c.awaitNanos(100);
766	<	assertTrue(t <= 0);
767	<	lock.writeLock().unlock();
482	<	}
483	<	catch (Exception ex) {
484	<	unexpectedException();
485	<	}
763	>
764	>	lock.writeLock().lock();
765	>	long t = c.awaitNanos(100);
766	>	assertTrue(t <= 0);
767	>	lock.writeLock().unlock();
768		}
769
770
771		/**
772		*  timed await without a signal times out
773		*/
774	<	public void testAwait_Timeout() {
775	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
774	>	public void testAwait_Timeout() throws InterruptedException {
775	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
776		final Condition c = lock.writeLock().newCondition();
777	<	try {
778	<	lock.writeLock().lock();
779	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
498	<	lock.writeLock().unlock();
499	<	}
500	<	catch (Exception ex) {
501	<	unexpectedException();
502	<	}
777	>	lock.writeLock().lock();
778	>	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
779	>	lock.writeLock().unlock();
780		}
781
782		/**
783		* awaitUntil without a signal times out
784		*/
785	<	public void testAwaitUntil_Timeout() {
786	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
785	>	public void testAwaitUntil_Timeout() throws InterruptedException {
786	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
787		final Condition c = lock.writeLock().newCondition();
788	<	try {
789	<	lock.writeLock().lock();
790	<	java.util.Date d = new java.util.Date();
791	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
515	<	lock.writeLock().unlock();
516	<	}
517	<	catch (Exception ex) {
518	<	unexpectedException();
519	<	}
788	>	lock.writeLock().lock();
789	>	java.util.Date d = new java.util.Date();
790	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
791	>	lock.writeLock().unlock();
792		}
793
794		/**
795		* await returns when signalled
796		*/
797	<	public void testAwait() {
798	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
797	>	public void testAwait() throws InterruptedException {
798	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
799		final Condition c = lock.writeLock().newCondition();
800	<	Thread t = new Thread(new Runnable() {
801	<	public void run() {
802	<	try {
803	<	lock.writeLock().lock();
804	<	c.await();
805	<	lock.writeLock().unlock();
806	<	}
807	<	catch(InterruptedException e) {
808	<	threadUnexpectedException();
809	<	}
810	<	}
811	<	});
800	>	Thread t = new Thread(new CheckedRunnable() {
801	>	public void realRun() throws InterruptedException {
802	>	lock.writeLock().lock();
803	>	c.await();
804	>	lock.writeLock().unlock();
805	>	}});
806	>
807	>	t.start();
808	>	Thread.sleep(SHORT_DELAY_MS);
809	>	lock.writeLock().lock();
810	>	c.signal();
811	>	lock.writeLock().unlock();
812	>	t.join(SHORT_DELAY_MS);
813	>	assertFalse(t.isAlive());
814	>	}
815	>
816	>	/** A helper class for uninterruptible wait tests */
817	>	class UninterruptableThread extends Thread {
818	>	private Lock lock;
819	>	private Condition c;
820	>
821	>	public volatile boolean canAwake = false;
822	>	public volatile boolean interrupted = false;
823	>	public volatile boolean lockStarted = false;
824	>
825	>	public UninterruptableThread(Lock lock, Condition c) {
826	>	this.lock = lock;
827	>	this.c = c;
828	>	}
829	>
830	>	public synchronized void run() {
831	>	lock.lock();
832	>	lockStarted = true;
833	>
834	>	while (!canAwake) {
835	>	c.awaitUninterruptibly();
836	>	}
837
838	<	try {
839	<	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();
838	>	interrupted = isInterrupted();
839	>	lock.unlock();
840		}
841		}
842
843		/**
844		* awaitUninterruptibly doesn't abort on interrupt
845		*/
846	<	public void testAwaitUninterruptibly() {
847	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
846	>	public void testAwaitUninterruptibly() throws InterruptedException {
847	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
848		final Condition c = lock.writeLock().newCondition();
849	<	Thread t = new Thread(new Runnable() {
562	<	public void run() {
563	<	lock.writeLock().lock();
564	<	c.awaitUninterruptibly();
565	<	lock.writeLock().unlock();
566	<	}
567	<	});
849	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
850
851	+	thread.start();
852	+
853	+	while (!thread.lockStarted) {
854	+	Thread.sleep(100);
855	+	}
856	+
857	+	lock.writeLock().lock();
858		try {
859	<	t.start();
860	<	Thread.sleep(SHORT_DELAY_MS);
572	<	t.interrupt();
573	<	lock.writeLock().lock();
859	>	thread.interrupt();
860	>	thread.canAwake = true;
861		c.signal();
862	+	} finally {
863		lock.writeLock().unlock();
576	–	assert(t.isInterrupted());
577	–	t.join(SHORT_DELAY_MS);
578	–	assertFalse(t.isAlive());
579	–	}
580	–	catch (Exception ex) {
581	–	unexpectedException();
864		}
865	+
866	+	thread.join();
867	+	assertTrue(thread.interrupted);
868	+	assertFalse(thread.isAlive());
869		}
870
871		/**
872		* await is interruptible
873		*/
874	<	public void testAwait_Interrupt() {
875	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
874	>	public void testAwait_Interrupt() throws InterruptedException {
875	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
876		final Condition c = lock.writeLock().newCondition();
877	<	Thread t = new Thread(new Runnable() {
878	<	public void run() {
879	<	try {
880	<	lock.writeLock().lock();
881	<	c.await();
882	<	lock.writeLock().unlock();
883	<	threadShouldThrow();
884	<	}
885	<	catch(InterruptedException success) {
886	<	}
887	<	}
888	<	});
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	<	}
877	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
878	>	public void realRun() throws InterruptedException {
879	>	lock.writeLock().lock();
880	>	c.await();
881	>	lock.writeLock().unlock();
882	>	}});
883	>
884	>	t.start();
885	>	Thread.sleep(SHORT_DELAY_MS);
886	>	t.interrupt();
887	>	t.join(SHORT_DELAY_MS);
888	>	assertFalse(t.isAlive());
889		}
890
891		/**
892		* awaitNanos is interruptible
893		*/
894	<	public void testAwaitNanos_Interrupt() {
895	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
894	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
895	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
896		final Condition c = lock.writeLock().newCondition();
897	<	Thread t = new Thread(new Runnable() {
898	<	public void run() {
899	<	try {
900	<	lock.writeLock().lock();
901	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
902	<	lock.writeLock().unlock();
903	<	threadShouldThrow();
904	<	}
905	<	catch(InterruptedException success) {
906	<	}
907	<	}
908	<	});
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	<	}
897	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
898	>	public void realRun() throws InterruptedException {
899	>	lock.writeLock().lock();
900	>	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
901	>	lock.writeLock().unlock();
902	>	}});
903	>
904	>	t.start();
905	>	Thread.sleep(SHORT_DELAY_MS);
906	>	t.interrupt();
907	>	t.join(SHORT_DELAY_MS);
908	>	assertFalse(t.isAlive());
909		}
910
911		/**
912		* awaitUntil is interruptible
913		*/
914	<	public void testAwaitUntil_Interrupt() {
915	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
914	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
915	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
916		final Condition c = lock.writeLock().newCondition();
917	<	Thread t = new Thread(new Runnable() {
918	<	public void run() {
919	<	try {
920	<	lock.writeLock().lock();
921	<	java.util.Date d = new java.util.Date();
922	<	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
923	<	lock.writeLock().unlock();
924	<	threadShouldThrow();
925	<	}
926	<	catch(InterruptedException success) {
927	<	}
928	<	}
929	<	});
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	<	}
917	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
918	>	public void realRun() throws InterruptedException {
919	>	lock.writeLock().lock();
920	>	java.util.Date d = new java.util.Date();
921	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
922	>	lock.writeLock().unlock();
923	>	}});
924	>
925	>	t.start();
926	>	Thread.sleep(SHORT_DELAY_MS);
927	>	t.interrupt();
928	>	t.join(SHORT_DELAY_MS);
929	>	assertFalse(t.isAlive());
930		}
931
932		/**
933		* signalAll wakes up all threads
934		*/
935	<	public void testSignalAll() {
936	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
935	>	public void testSignalAll() throws InterruptedException {
936	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
937		final Condition c = lock.writeLock().newCondition();
938	<	Thread t1 = new Thread(new Runnable() {
939	<	public void run() {
940	<	try {
941	<	lock.writeLock().lock();
942	<	c.await();
943	<	lock.writeLock().unlock();
944	<	}
945	<	catch(InterruptedException e) {
946	<	threadUnexpectedException();
947	<	}
948	<	}
949	<	});
950	<
951	<	Thread t2 = new Thread(new Runnable() {
952	<	public void run() {
953	<	try {
954	<	lock.writeLock().lock();
955	<	c.await();
956	<	lock.writeLock().unlock();
957	<	}
958	<	catch(InterruptedException e) {
959	<	threadUnexpectedException();
960	<	}
961	<	}
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	<	}
938	>	Thread t1 = new Thread(new CheckedRunnable() {
939	>	public void realRun() throws InterruptedException {
940	>	lock.writeLock().lock();
941	>	c.await();
942	>	lock.writeLock().unlock();
943	>	}});
944	>
945	>	Thread t2 = new Thread(new CheckedRunnable() {
946	>	public void realRun() throws InterruptedException {
947	>	lock.writeLock().lock();
948	>	c.await();
949	>	lock.writeLock().unlock();
950	>	}});
951	>
952	>	t1.start();
953	>	t2.start();
954	>	Thread.sleep(SHORT_DELAY_MS);
955	>	lock.writeLock().lock();
956	>	c.signalAll();
957	>	lock.writeLock().unlock();
958	>	t1.join(SHORT_DELAY_MS);
959	>	t2.join(SHORT_DELAY_MS);
960	>	assertFalse(t1.isAlive());
961	>	assertFalse(t2.isAlive());
962		}
963
964		/**
965		* A serialized lock deserializes as unlocked
966		*/
967	<	public void testSerialization() {
967	>	public void testSerialization() throws Exception {
968		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
969		l.readLock().lock();
970		l.readLock().unlock();
971
972	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
973	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
974	+	out.writeObject(l);
975	+	out.close();
976	+
977	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
978	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
979	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
980	+	r.readLock().lock();
981	+	r.readLock().unlock();
982	+	}
983	+
984	+	/**
985	+	* hasQueuedThreads reports whether there are waiting threads
986	+	*/
987	+	public void testhasQueuedThreads() throws InterruptedException {
988	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
989	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
990	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
991	+	assertFalse(lock.hasQueuedThreads());
992	+	lock.writeLock().lock();
993	+	t1.start();
994	+	Thread.sleep(SHORT_DELAY_MS);
995	+	assertTrue(lock.hasQueuedThreads());
996	+	t2.start();
997	+	Thread.sleep(SHORT_DELAY_MS);
998	+	assertTrue(lock.hasQueuedThreads());
999	+	t1.interrupt();
1000	+	Thread.sleep(SHORT_DELAY_MS);
1001	+	assertTrue(lock.hasQueuedThreads());
1002	+	lock.writeLock().unlock();
1003	+	Thread.sleep(SHORT_DELAY_MS);
1004	+	assertFalse(lock.hasQueuedThreads());
1005	+	t1.join();
1006	+	t2.join();
1007	+	}
1008	+
1009	+	/**
1010	+	* hasQueuedThread(null) throws NPE
1011	+	*/
1012	+	public void testHasQueuedThreadNPE() {
1013	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1014		try {
1015	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1016	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1017	<	out.writeObject(l);
1018	<	out.close();
1019	<
1020	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1021	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1022	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1023	<	r.readLock().lock();
1024	<	r.readLock().unlock();
1025	<	} catch(Exception e){
1026	<	e.printStackTrace();
1027	<	unexpectedException();
1028	<	}
1015	>	sync.hasQueuedThread(null);
1016	>	shouldThrow();
1017	>	} catch (NullPointerException success) {}
1018	>	}
1019	>
1020	>	/**
1021	>	* hasQueuedThread reports whether a thread is queued.
1022	>	*/
1023	>	public void testHasQueuedThread() throws InterruptedException {
1024	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1025	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1026	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1027	>	assertFalse(sync.hasQueuedThread(t1));
1028	>	assertFalse(sync.hasQueuedThread(t2));
1029	>	sync.writeLock().lock();
1030	>	t1.start();
1031	>	Thread.sleep(SHORT_DELAY_MS);
1032	>	assertTrue(sync.hasQueuedThread(t1));
1033	>	t2.start();
1034	>	Thread.sleep(SHORT_DELAY_MS);
1035	>	assertTrue(sync.hasQueuedThread(t1));
1036	>	assertTrue(sync.hasQueuedThread(t2));
1037	>	t1.interrupt();
1038	>	Thread.sleep(SHORT_DELAY_MS);
1039	>	assertFalse(sync.hasQueuedThread(t1));
1040	>	assertTrue(sync.hasQueuedThread(t2));
1041	>	sync.writeLock().unlock();
1042	>	Thread.sleep(SHORT_DELAY_MS);
1043	>	assertFalse(sync.hasQueuedThread(t1));
1044	>	Thread.sleep(SHORT_DELAY_MS);
1045	>	assertFalse(sync.hasQueuedThread(t2));
1046	>	t1.join();
1047	>	t2.join();
1048	>	}
1049	>
1050	>
1051	>	/**
1052	>	* getQueueLength reports number of waiting threads
1053	>	*/
1054	>	public void testGetQueueLength() throws InterruptedException {
1055	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1056	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1057	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1058	>	assertEquals(0, lock.getQueueLength());
1059	>	lock.writeLock().lock();
1060	>	t1.start();
1061	>	Thread.sleep(SHORT_DELAY_MS);
1062	>	assertEquals(1, lock.getQueueLength());
1063	>	t2.start();
1064	>	Thread.sleep(SHORT_DELAY_MS);
1065	>	assertEquals(2, lock.getQueueLength());
1066	>	t1.interrupt();
1067	>	Thread.sleep(SHORT_DELAY_MS);
1068	>	assertEquals(1, lock.getQueueLength());
1069	>	lock.writeLock().unlock();
1070	>	Thread.sleep(SHORT_DELAY_MS);
1071	>	assertEquals(0, lock.getQueueLength());
1072	>	t1.join();
1073	>	t2.join();
1074	>	}
1075	>
1076	>	/**
1077	>	* getQueuedThreads includes waiting threads
1078	>	*/
1079	>	public void testGetQueuedThreads() throws InterruptedException {
1080	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1081	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1082	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1083	>	assertTrue(lock.getQueuedThreads().isEmpty());
1084	>	lock.writeLock().lock();
1085	>	assertTrue(lock.getQueuedThreads().isEmpty());
1086	>	t1.start();
1087	>	Thread.sleep(SHORT_DELAY_MS);
1088	>	assertTrue(lock.getQueuedThreads().contains(t1));
1089	>	t2.start();
1090	>	Thread.sleep(SHORT_DELAY_MS);
1091	>	assertTrue(lock.getQueuedThreads().contains(t1));
1092	>	assertTrue(lock.getQueuedThreads().contains(t2));
1093	>	t1.interrupt();
1094	>	Thread.sleep(SHORT_DELAY_MS);
1095	>	assertFalse(lock.getQueuedThreads().contains(t1));
1096	>	assertTrue(lock.getQueuedThreads().contains(t2));
1097	>	lock.writeLock().unlock();
1098	>	Thread.sleep(SHORT_DELAY_MS);
1099	>	assertTrue(lock.getQueuedThreads().isEmpty());
1100	>	t1.join();
1101	>	t2.join();
1102	>	}
1103	>
1104	>	/**
1105	>	* hasWaiters throws NPE if null
1106	>	*/
1107	>	public void testHasWaitersNPE() {
1108	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1109	>	try {
1110	>	lock.hasWaiters(null);
1111	>	shouldThrow();
1112	>	} catch (NullPointerException success) {}
1113	>	}
1114	>
1115	>	/**
1116	>	* getWaitQueueLength throws NPE if null
1117	>	*/
1118	>	public void testGetWaitQueueLengthNPE() {
1119	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1120	>	try {
1121	>	lock.getWaitQueueLength(null);
1122	>	shouldThrow();
1123	>	} catch (NullPointerException success) {}
1124	>	}
1125	>
1126	>
1127	>	/**
1128	>	* getWaitingThreads throws NPE if null
1129	>	*/
1130	>	public void testGetWaitingThreadsNPE() {
1131	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1132	>	try {
1133	>	lock.getWaitingThreads(null);
1134	>	shouldThrow();
1135	>	} catch (NullPointerException success) {}
1136	>	}
1137	>
1138	>	/**
1139	>	* hasWaiters throws IAE if not owned
1140	>	*/
1141	>	public void testHasWaitersIAE() {
1142	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1143	>	final Condition c = lock.writeLock().newCondition();
1144	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1145	>	try {
1146	>	lock2.hasWaiters(c);
1147	>	shouldThrow();
1148	>	} catch (IllegalArgumentException success) {}
1149	>	}
1150	>
1151	>	/**
1152	>	* hasWaiters throws IMSE if not locked
1153	>	*/
1154	>	public void testHasWaitersIMSE() {
1155	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1156	>	final Condition c = lock.writeLock().newCondition();
1157	>	try {
1158	>	lock.hasWaiters(c);
1159	>	shouldThrow();
1160	>	} catch (IllegalMonitorStateException success) {}
1161	>	}
1162	>
1163	>
1164	>	/**
1165	>	* getWaitQueueLength throws IAE if not owned
1166	>	*/
1167	>	public void testGetWaitQueueLengthIAE() {
1168	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1169	>	final Condition c = lock.writeLock().newCondition();
1170	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1171	>	try {
1172	>	lock2.getWaitQueueLength(c);
1173	>	shouldThrow();
1174	>	} catch (IllegalArgumentException success) {}
1175		}
1176
1177	+	/**
1178	+	* getWaitQueueLength throws IMSE if not locked
1179	+	*/
1180	+	public void testGetWaitQueueLengthIMSE() {
1181	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1182	+	final Condition c = lock.writeLock().newCondition();
1183	+	try {
1184	+	lock.getWaitQueueLength(c);
1185	+	shouldThrow();
1186	+	} catch (IllegalMonitorStateException success) {}
1187	+	}
1188	+
1189	+
1190	+	/**
1191	+	* getWaitingThreads throws IAE if not owned
1192	+	*/
1193	+	public void testGetWaitingThreadsIAE() {
1194	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1195	+	final Condition c = lock.writeLock().newCondition();
1196	+	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1197	+	try {
1198	+	lock2.getWaitingThreads(c);
1199	+	shouldThrow();
1200	+	} catch (IllegalArgumentException success) {}
1201	+	}
1202	+
1203	+	/**
1204	+	* getWaitingThreads throws IMSE if not locked
1205	+	*/
1206	+	public void testGetWaitingThreadsIMSE() {
1207	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1208	+	final Condition c = lock.writeLock().newCondition();
1209	+	try {
1210	+	lock.getWaitingThreads(c);
1211	+	shouldThrow();
1212	+	} catch (IllegalMonitorStateException success) {}
1213	+	}
1214	+
1215	+
1216	+	/**
1217	+	* hasWaiters returns true when a thread is waiting, else false
1218	+	*/
1219	+	public void testHasWaiters() throws InterruptedException {
1220	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1221	+	final Condition c = lock.writeLock().newCondition();
1222	+	Thread t = new Thread(new CheckedRunnable() {
1223	+	public void realRun() throws InterruptedException {
1224	+	lock.writeLock().lock();
1225	+	threadAssertFalse(lock.hasWaiters(c));
1226	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1227	+	c.await();
1228	+	lock.writeLock().unlock();
1229	+	}});
1230	+
1231	+	t.start();
1232	+	Thread.sleep(SHORT_DELAY_MS);
1233	+	lock.writeLock().lock();
1234	+	assertTrue(lock.hasWaiters(c));
1235	+	assertEquals(1, lock.getWaitQueueLength(c));
1236	+	c.signal();
1237	+	lock.writeLock().unlock();
1238	+	Thread.sleep(SHORT_DELAY_MS);
1239	+	lock.writeLock().lock();
1240	+	assertFalse(lock.hasWaiters(c));
1241	+	assertEquals(0, lock.getWaitQueueLength(c));
1242	+	lock.writeLock().unlock();
1243	+	t.join(SHORT_DELAY_MS);
1244	+	assertFalse(t.isAlive());
1245	+	}
1246	+
1247	+	/**
1248	+	* getWaitQueueLength returns number of waiting threads
1249	+	*/
1250	+	public void testGetWaitQueueLength() throws InterruptedException {
1251	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1252	+	final Condition c = lock.writeLock().newCondition();
1253	+	Thread t = new Thread(new CheckedRunnable() {
1254	+	public void realRun() throws InterruptedException {
1255	+	lock.writeLock().lock();
1256	+	threadAssertFalse(lock.hasWaiters(c));
1257	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1258	+	c.await();
1259	+	lock.writeLock().unlock();
1260	+	}});
1261	+
1262	+	t.start();
1263	+	Thread.sleep(SHORT_DELAY_MS);
1264	+	lock.writeLock().lock();
1265	+	assertTrue(lock.hasWaiters(c));
1266	+	assertEquals(1, lock.getWaitQueueLength(c));
1267	+	c.signal();
1268	+	lock.writeLock().unlock();
1269	+	Thread.sleep(SHORT_DELAY_MS);
1270	+	lock.writeLock().lock();
1271	+	assertFalse(lock.hasWaiters(c));
1272	+	assertEquals(0, lock.getWaitQueueLength(c));
1273	+	lock.writeLock().unlock();
1274	+	t.join(SHORT_DELAY_MS);
1275	+	assertFalse(t.isAlive());
1276	+	}
1277	+
1278	+
1279	+	/**
1280	+	* getWaitingThreads returns only and all waiting threads
1281	+	*/
1282	+	public void testGetWaitingThreads() throws InterruptedException {
1283	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1284	+	final Condition c = lock.writeLock().newCondition();
1285	+	Thread t1 = new Thread(new CheckedRunnable() {
1286	+	public void realRun() throws InterruptedException {
1287	+	lock.writeLock().lock();
1288	+	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1289	+	c.await();
1290	+	lock.writeLock().unlock();
1291	+	}});
1292	+
1293	+	Thread t2 = new Thread(new CheckedRunnable() {
1294	+	public void realRun() throws InterruptedException {
1295	+	lock.writeLock().lock();
1296	+	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1297	+	c.await();
1298	+	lock.writeLock().unlock();
1299	+	}});
1300	+
1301	+	lock.writeLock().lock();
1302	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1303	+	lock.writeLock().unlock();
1304	+	t1.start();
1305	+	Thread.sleep(SHORT_DELAY_MS);
1306	+	t2.start();
1307	+	Thread.sleep(SHORT_DELAY_MS);
1308	+	lock.writeLock().lock();
1309	+	assertTrue(lock.hasWaiters(c));
1310	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1311	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1312	+	c.signalAll();
1313	+	lock.writeLock().unlock();
1314	+	Thread.sleep(SHORT_DELAY_MS);
1315	+	lock.writeLock().lock();
1316	+	assertFalse(lock.hasWaiters(c));
1317	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1318	+	lock.writeLock().unlock();
1319	+	t1.join(SHORT_DELAY_MS);
1320	+	t2.join(SHORT_DELAY_MS);
1321	+	assertFalse(t1.isAlive());
1322	+	assertFalse(t2.isAlive());
1323	+	}
1324	+
1325	+	/**
1326	+	* toString indicates current lock state
1327	+	*/
1328	+	public void testToString() {
1329	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1330	+	String us = lock.toString();
1331	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1332	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1333	+	lock.writeLock().lock();
1334	+	String ws = lock.toString();
1335	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1336	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1337	+	lock.writeLock().unlock();
1338	+	lock.readLock().lock();
1339	+	lock.readLock().lock();
1340	+	String rs = lock.toString();
1341	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1342	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1343	+	}
1344	+
1345	+	/**
1346	+	* readLock.toString indicates current lock state
1347	+	*/
1348	+	public void testReadLockToString() {
1349	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1350	+	String us = lock.readLock().toString();
1351	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1352	+	lock.readLock().lock();
1353	+	lock.readLock().lock();
1354	+	String rs = lock.readLock().toString();
1355	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1356	+	}
1357	+
1358	+	/**
1359	+	* writeLock.toString indicates current lock state
1360	+	*/
1361	+	public void testWriteLockToString() {
1362	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1363	+	String us = lock.writeLock().toString();
1364	+	assertTrue(us.indexOf("Unlocked") >= 0);
1365	+	lock.writeLock().lock();
1366	+	String ls = lock.writeLock().toString();
1367	+	assertTrue(ls.indexOf("Locked") >= 0);
1368	+	}
1369
1370		}

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