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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.2 by dl, Sun Sep 7 20:39:11 2003 UTC vs.
Revision 1.38 by jsr166, Sat Nov 21 21:59:50 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 TestCase {
14	<	static int HOLD_COUNT_TEST_LIMIT = 20;
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		}
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
25	–	private static long SHORT_DELAY_MS = 100;
26	–	private static long MEDIUM_DELAY_MS = 1000;
27	–	private static long LONG_DELAY_MS = 10000;
35
36	<	/*
37	<	* Unlocks an unlocked lock, throws Illegal Monitor State
38	<	*
36	>	/**
37	>	* A runnable calling lockInterruptibly that expects to be
38	>	* interrupted
39		*/
40	<
41	<	public void testIllegalMonitorStateException(){
42	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
43	<	try{
44	<	rl.writeLock().unlock();
45	<	fail("Should of thown Illegal Monitor State Exception");
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	<	}catch(IllegalMonitorStateException success){}
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();
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	<	public void testInterruptedException(){
105	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
106	<	lock.writeLock().lock();
107	<	Thread t = new Thread(new Runnable() {
108	<	public void run(){
109	<	try{
110	<	lock.writeLock().lockInterruptibly();
111	<	fail("should throw");
112	<	}catch(InterruptedException success){}
113	<	}
114	<	});
115	<	try {
116	<	t.start();
117	<	t.interrupt();
118	<	lock.writeLock().unlock();
119	<	t.join();
120	<	} catch(Exception e){
121	<	fail("unexpected exception");
122	<	}
123	<	}
124	<
125	<	public void testInterruptedException2(){
126	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
127	<	lock.writeLock().lock();
69	<	Thread t = new Thread(new Runnable() {
70	<	public void run(){
71	<	try{
72	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
73	<	fail("should throw");
74	<	}catch(InterruptedException success){}
75	<	}
76	<	});
77	<	try {
78	<	t.start();
79	<	t.interrupt();
80	<	lock.writeLock().unlock();
81	<	t.join();
82	<	} catch(Exception e){
83	<	fail("unexpected exception");
84	<	}
104	>
105	>	/**
106	>	* locking an unlocked fair lock succeeds
107	>	*/
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	<	public void testInterruptedException3(){
131	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
132	<	lock.writeLock().lock();
133	<	Thread t = new Thread(new Runnable() {
134	<	public void run(){
135	<	try{
136	<	lock.readLock().lockInterruptibly();
137	<	fail("should throw");
138	<	}catch(InterruptedException success){}
139	<	}
97	<	});
98	<	try {
99	<	t.start();
100	<	t.interrupt();
130	>	/**
131	>	* getWriteHoldCount returns number of recursive holds
132	>	*/
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	<	t.join();
103	<	} catch(Exception e){
104	<	fail("unexpected exception");
105	<	}
106	<	}
107	<
108	<	public void testInterruptedException4(){
109	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
110	<	lock.writeLock().lock();
111	<	Thread t = new Thread(new Runnable() {
112	<	public void run(){
113	<	try{
114	<	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
115	<	fail("should throw");
116	<	}catch(InterruptedException success){}
117	<	}
118	<	});
119	<	try {
120	<	t.start();
121	<	t.interrupt();
122	<	t.join();
123	<	} catch(Exception e){
124	<	fail("unexpected exception");
141	>	assertEquals(i-1,lock.getWriteHoldCount());
142		}
143		}
144
145	<
146	<	public void testTryLockWhenLocked() {
147	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
148	<	lock.writeLock().lock();
149	<	Thread t = new Thread(new Runnable() {
150	<	public void run(){
151	<	assertFalse(lock.writeLock().tryLock());
152	<	}
136	<	});
137	<	try {
138	<	t.start();
139	<	t.join();
140	<	lock.writeLock().unlock();
141	<	} catch(Exception e){
142	<	fail("unexpected exception");
145	>	/**
146	>	* WriteLock.getHoldCount returns number of recursive holds
147	>	*/
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	<	}
145	<
146	<	public void testTryLockWhenLocked2() {
147	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
148	<	lock.writeLock().lock();
149	<	Thread t = new Thread(new Runnable() {
150	<	public void run(){
151	<	assertFalse(lock.readLock().tryLock());
152	<	}
153	<	});
154	<	try {
155	<	t.start();
156	<	t.join();
154	>	for (int i = SIZE; i > 0; i--) {
155		lock.writeLock().unlock();
156	<	} catch(Exception e){
159	<	fail("unexpected exception");
156	>	assertEquals(i-1,lock.writeLock().getHoldCount());
157		}
158	<	}
158	>	}
159
160	<	public void testMultipleReadLocks() {
161	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
162	<	lock.readLock().lock();
163	<	Thread t = new Thread(new Runnable() {
164	<	public void run(){
165	<	assertTrue(lock.readLock().tryLock());
166	<	lock.readLock().unlock();
167	<	}
171	<	});
172	<	try {
173	<	t.start();
174	<	t.join();
175	<	lock.readLock().unlock();
176	<	} catch(Exception e){
177	<	fail("unexpected exception");
160	>	/**
161	>	* getReadHoldCount returns number of recursive holds
162	>	*/
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	<	}
180	<
181	<	public void testWriteAfterMultipleReadLocks() {
182	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
183	<	lock.readLock().lock();
184	<	Thread t1 = new Thread(new Runnable() {
185	<	public void run(){
186	<	lock.readLock().lock();
187	<	lock.readLock().unlock();
188	<	}
189	<	});
190	<	Thread t2 = new Thread(new Runnable() {
191	<	public void run(){
192	<	lock.writeLock().lock();
193	<	lock.writeLock().unlock();
194	<	}
195	<	});
196	<
197	<	try {
198	<	t1.start();
199	<	t2.start();
200	<	Thread.sleep(SHORT_DELAY_MS);
169	>	for (int i = SIZE; i > 0; i--) {
170		lock.readLock().unlock();
171	<	t1.join(MEDIUM_DELAY_MS);
203	<	t2.join(MEDIUM_DELAY_MS);
204	<	assertTrue(!t1.isAlive());
205	<	assertTrue(!t2.isAlive());
206	<
207	<	} catch(Exception e){
208	<	fail("unexpected exception");
209	<	}
210	<	}
211	<
212	<	public void testReadAfterWriteLock() {
213	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
214	<	lock.writeLock().lock();
215	<	Thread t1 = new Thread(new Runnable() {
216	<	public void run(){
217	<	lock.readLock().lock();
218	<	lock.readLock().unlock();
219	<	}
220	<	});
221	<	Thread t2 = new Thread(new Runnable() {
222	<	public void run(){
223	<	lock.readLock().lock();
224	<	lock.readLock().unlock();
225	<	}
226	<	});
227	<
228	<	try {
229	<	t1.start();
230	<	t2.start();
231	<	Thread.sleep(SHORT_DELAY_MS);
232	<	lock.writeLock().unlock();
233	<	t1.join(MEDIUM_DELAY_MS);
234	<	t2.join(MEDIUM_DELAY_MS);
235	<	assertTrue(!t1.isAlive());
236	<	assertTrue(!t2.isAlive());
237	<
238	<	} catch(Exception e){
239	<	fail("unexpected exception");
240	<	}
241	<	}
242	<
243	<
244	<	public void testTryLockWhenReadLocked() {
245	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
246	<	lock.readLock().lock();
247	<	Thread t = new Thread(new Runnable() {
248	<	public void run(){
249	<	assertTrue(lock.readLock().tryLock());
250	<	lock.readLock().unlock();
251	<	}
252	<	});
253	<	try {
254	<	t.start();
255	<	t.join();
256	<	lock.readLock().unlock();
257	<	} catch(Exception e){
258	<	fail("unexpected exception");
171	>	assertEquals(i-1,lock.getReadHoldCount());
172		}
173	<	}
173	>	}
174
262	–
175
176	<	public void testWriteTryLockWhenReadLocked() {
177	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
178	<	lock.readLock().lock();
179	<	Thread t = new Thread(new Runnable() {
180	<	public void run(){
269	<	assertFalse(lock.writeLock().tryLock());
270	<	}
271	<	});
176	>	/**
177	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
178	>	*/
179	>	public void testUnlock_IllegalMonitorStateException() {
180	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
181		try {
182	<	t.start();
183	<	t.join();
184	<	lock.readLock().unlock();
185	<	} catch(Exception e){
277	<	fail("unexpected exception");
278	<	}
279	<	}
182	>	rl.writeLock().unlock();
183	>	shouldThrow();
184	>	} catch (IllegalMonitorStateException success) {}
185	>	}
186
281	–
187
188	<	public void testTryLock_Timeout(){
189	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
190	<	lock.writeLock().lock();
191	<	Thread t = new Thread(new Runnable() {
192	<	public void run(){
193	<	try {
194	<	assertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
195	<	} catch (Exception ex) {
196	<	fail("unexpected exception");
197	<	}
198	<	}
199	<	});
200	<	try {
201	<	t.start();
202	<	t.join();
203	<	lock.writeLock().unlock();
204	<	} catch(Exception e){
205	<	fail("unexpected exception");
206	<	}
207	<	}
188	>	/**
189	>	* write-lockInterruptibly is interruptible
190	>	*/
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	<	public void testTryLock_Timeout2(){
211	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
212	<	lock.writeLock().lock();
213	<	Thread t = new Thread(new Runnable() {
214	<	public void run(){
215	<	try {
216	<	assertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
217	<	} catch (Exception ex) {
218	<	fail("unexpected exception");
219	<	}
220	<	}
221	<	});
222	<	try {
223	<	t.start();
224	<	t.join();
225	<	lock.writeLock().unlock();
226	<	} catch(Exception e){
321	<	fail("unexpected exception");
322	<	}
323	<	}
210	>	/**
211	>	* timed write-tryLock is interruptible
212	>	*/
213	>	public void testWriteTryLock_Interrupted() throws InterruptedException {
214	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
215	>	lock.writeLock().lock();
216	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
217	>	public void realRun() throws InterruptedException {
218	>	lock.writeLock().tryLock(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 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	<	public void testLockInterruptibly() {
248	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
249	<	try {
250	<	lock.writeLock().lockInterruptibly();
251	<	} catch(Exception e) {
252	<	fail("unexpected exception");
253	<	}
254	<	Thread t = new Thread(new Runnable() {
255	<	public void run() {
256	<	try {
257	<	lock.writeLock().lockInterruptibly();
258	<	fail("should throw");
259	<	}
260	<	catch(InterruptedException success) {
340	<	}
341	<	}
342	<	});
343	<	try {
344	<	t.start();
345	<	t.interrupt();
346	<	t.join();
347	<	lock.writeLock().unlock();
348	<	} catch(Exception e){
349	<	fail("unexpected exception");
350	<	}
247	>	/**
248	>	* timed read-tryLock is interruptible
249	>	*/
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(1000,MILLISECONDS);
256	>	}});
257	>
258	>	t.start();
259	>	t.interrupt();
260	>	t.join();
261		}
262
263	<	public void testLockInterruptibly2() {
264	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
265	<	try {
266	<	lock.writeLock().lockInterruptibly();
267	<	} catch(Exception e) {
268	<	fail("unexpected exception");
269	<	}
270	<	Thread t = new Thread(new Runnable() {
271	<	public void run() {
272	<	try {
273	<	lock.readLock().lockInterruptibly();
274	<	fail("should throw");
275	<	}
276	<	catch(InterruptedException success) {
277	<	}
368	<	}
369	<	});
370	<	try {
371	<	t.start();
372	<	t.interrupt();
373	<	t.join();
374	<	lock.writeLock().unlock();
375	<	} catch(Exception e){
376	<	fail("unexpected exception");
377	<	}
263	>
264	>	/**
265	>	* write-tryLock fails if locked
266	>	*/
267	>	public void testWriteTryLockWhenLocked() throws InterruptedException {
268	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
269	>	lock.writeLock().lock();
270	>	Thread t = new Thread(new CheckedRunnable() {
271	>	public void realRun() {
272	>	threadAssertFalse(lock.writeLock().tryLock());
273	>	}});
274	>
275	>	t.start();
276	>	t.join();
277	>	lock.writeLock().unlock();
278		}
279
280	<	public void testAwait_IllegalMonitor() {
281	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
280	>	/**
281	>	* read-tryLock fails if locked
282	>	*/
283	>	public void testReadTryLockWhenLocked() throws InterruptedException {
284	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
285	>	lock.writeLock().lock();
286	>	Thread t = new Thread(new CheckedRunnable() {
287	>	public void realRun() {
288	>	threadAssertFalse(lock.readLock().tryLock());
289	>	}});
290	>
291	>	t.start();
292	>	t.join();
293	>	lock.writeLock().unlock();
294	>	}
295	>
296	>	/**
297	>	* Multiple threads can hold a read lock when not write-locked
298	>	*/
299	>	public void testMultipleReadLocks() throws InterruptedException {
300	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
301	>	lock.readLock().lock();
302	>	Thread t = new Thread(new CheckedRunnable() {
303	>	public void realRun() {
304	>	threadAssertTrue(lock.readLock().tryLock());
305	>	lock.readLock().unlock();
306	>	}});
307	>
308	>	t.start();
309	>	t.join();
310	>	lock.readLock().unlock();
311	>	}
312	>
313	>	/**
314	>	* A writelock succeeds after reading threads unlock
315	>	*/
316	>	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
317	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
318	>	lock.readLock().lock();
319	>	Thread t1 = new Thread(new CheckedRunnable() {
320	>	public void realRun() {
321	>	lock.readLock().lock();
322	>	lock.readLock().unlock();
323	>	}});
324	>	Thread t2 = new Thread(new CheckedRunnable() {
325	>	public void realRun() {
326	>	lock.writeLock().lock();
327	>	lock.writeLock().unlock();
328	>	}});
329	>
330	>	t1.start();
331	>	t2.start();
332	>	Thread.sleep(SHORT_DELAY_MS);
333	>	lock.readLock().unlock();
334	>	t1.join(MEDIUM_DELAY_MS);
335	>	t2.join(MEDIUM_DELAY_MS);
336	>	assertTrue(!t1.isAlive());
337	>	assertTrue(!t2.isAlive());
338	>	}
339	>
340	>	/**
341	>	* Readlocks succeed after a writing thread unlocks
342	>	*/
343	>	public void testReadAfterWriteLock() throws InterruptedException {
344	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
345	>	lock.writeLock().lock();
346	>	Thread t1 = new Thread(new CheckedRunnable() {
347	>	public void realRun() {
348	>	lock.readLock().lock();
349	>	lock.readLock().unlock();
350	>	}});
351	>	Thread t2 = new Thread(new CheckedRunnable() {
352	>	public void realRun() {
353	>	lock.readLock().lock();
354	>	lock.readLock().unlock();
355	>	}});
356	>
357	>	t1.start();
358	>	t2.start();
359	>	Thread.sleep(SHORT_DELAY_MS);
360	>	lock.writeLock().unlock();
361	>	t1.join(MEDIUM_DELAY_MS);
362	>	t2.join(MEDIUM_DELAY_MS);
363	>	assertTrue(!t1.isAlive());
364	>	assertTrue(!t2.isAlive());
365	>	}
366	>
367	>	/**
368	>	* Read trylock succeeds if write locked by current thread
369	>	*/
370	>	public void testReadHoldingWriteLock() {
371	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
372	>	lock.writeLock().lock();
373	>	assertTrue(lock.readLock().tryLock());
374	>	lock.readLock().unlock();
375	>	lock.writeLock().unlock();
376	>	}
377	>
378	>	/**
379	>	* Read lock succeeds if write locked by current thread even if
380	>	* other threads are waiting for readlock
381	>	*/
382	>	public void testReadHoldingWriteLock2() throws InterruptedException {
383	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
384	>	lock.writeLock().lock();
385	>	Thread t1 = new Thread(new CheckedRunnable() {
386	>	public void realRun() {
387	>	lock.readLock().lock();
388	>	lock.readLock().unlock();
389	>	}});
390	>	Thread t2 = new Thread(new CheckedRunnable() {
391	>	public void realRun() {
392	>	lock.readLock().lock();
393	>	lock.readLock().unlock();
394	>	}});
395	>
396	>	t1.start();
397	>	t2.start();
398	>	lock.readLock().lock();
399	>	lock.readLock().unlock();
400	>	Thread.sleep(SHORT_DELAY_MS);
401	>	lock.readLock().lock();
402	>	lock.readLock().unlock();
403	>	lock.writeLock().unlock();
404	>	t1.join(MEDIUM_DELAY_MS);
405	>	t2.join(MEDIUM_DELAY_MS);
406	>	assertTrue(!t1.isAlive());
407	>	assertTrue(!t2.isAlive());
408	>	}
409	>
410	>	/**
411	>	*  Read lock succeeds if write locked by current thread even if
412	>	* other threads are waiting for writelock
413	>	*/
414	>	public void testReadHoldingWriteLock3() throws InterruptedException {
415	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
416	>	lock.writeLock().lock();
417	>	Thread t1 = new Thread(new CheckedRunnable() {
418	>	public void realRun() {
419	>	lock.writeLock().lock();
420	>	lock.writeLock().unlock();
421	>	}});
422	>	Thread t2 = new Thread(new CheckedRunnable() {
423	>	public void realRun() {
424	>	lock.writeLock().lock();
425	>	lock.writeLock().unlock();
426	>	}});
427	>
428	>	t1.start();
429	>	t2.start();
430	>	lock.readLock().lock();
431	>	lock.readLock().unlock();
432	>	Thread.sleep(SHORT_DELAY_MS);
433	>	lock.readLock().lock();
434	>	lock.readLock().unlock();
435	>	lock.writeLock().unlock();
436	>	t1.join(MEDIUM_DELAY_MS);
437	>	t2.join(MEDIUM_DELAY_MS);
438	>	assertTrue(!t1.isAlive());
439	>	assertTrue(!t2.isAlive());
440	>	}
441	>
442	>
443	>	/**
444	>	*  Write lock succeeds if write locked by current thread even if
445	>	* other threads are waiting for writelock
446	>	*/
447	>	public void testWriteHoldingWriteLock4() throws InterruptedException {
448	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
449	>	lock.writeLock().lock();
450	>	Thread t1 = new Thread(new CheckedRunnable() {
451	>	public void realRun() {
452	>	lock.writeLock().lock();
453	>	lock.writeLock().unlock();
454	>	}});
455	>	Thread t2 = new Thread(new CheckedRunnable() {
456	>	public void realRun() {
457	>	lock.writeLock().lock();
458	>	lock.writeLock().unlock();
459	>	}});
460	>
461	>	t1.start();
462	>	t2.start();
463	>	lock.writeLock().lock();
464	>	lock.writeLock().unlock();
465	>	Thread.sleep(SHORT_DELAY_MS);
466	>	lock.writeLock().lock();
467	>	lock.writeLock().unlock();
468	>	lock.writeLock().unlock();
469	>	t1.join(MEDIUM_DELAY_MS);
470	>	t2.join(MEDIUM_DELAY_MS);
471	>	assertTrue(!t1.isAlive());
472	>	assertTrue(!t2.isAlive());
473	>	}
474	>
475	>
476	>	/**
477	>	* Fair Read trylock succeeds if write locked by current thread
478	>	*/
479	>	public void testReadHoldingWriteLockFair() {
480	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
481	>	lock.writeLock().lock();
482	>	assertTrue(lock.readLock().tryLock());
483	>	lock.readLock().unlock();
484	>	lock.writeLock().unlock();
485	>	}
486	>
487	>	/**
488	>	* Fair Read lock succeeds if write locked by current thread even if
489	>	* other threads are waiting for readlock
490	>	*/
491	>	public void testReadHoldingWriteLockFair2() throws InterruptedException {
492	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
493	>	lock.writeLock().lock();
494	>	Thread t1 = new Thread(new CheckedRunnable() {
495	>	public void realRun() {
496	>	lock.readLock().lock();
497	>	lock.readLock().unlock();
498	>	}});
499	>	Thread t2 = new Thread(new CheckedRunnable() {
500	>	public void realRun() {
501	>	lock.readLock().lock();
502	>	lock.readLock().unlock();
503	>	}});
504	>
505	>	t1.start();
506	>	t2.start();
507	>	lock.readLock().lock();
508	>	lock.readLock().unlock();
509	>	Thread.sleep(SHORT_DELAY_MS);
510	>	lock.readLock().lock();
511	>	lock.readLock().unlock();
512	>	lock.writeLock().unlock();
513	>	t1.join(MEDIUM_DELAY_MS);
514	>	t2.join(MEDIUM_DELAY_MS);
515	>	assertTrue(!t1.isAlive());
516	>	assertTrue(!t2.isAlive());
517	>	}
518	>
519	>
520	>	/**
521	>	* Fair Read lock succeeds if write locked by current thread even if
522	>	* other threads are waiting for writelock
523	>	*/
524	>	public void testReadHoldingWriteLockFair3() throws InterruptedException {
525	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
526	>	lock.writeLock().lock();
527	>	Thread t1 = new Thread(new CheckedRunnable() {
528	>	public void realRun() {
529	>	lock.writeLock().lock();
530	>	lock.writeLock().unlock();
531	>	}});
532	>	Thread t2 = new Thread(new CheckedRunnable() {
533	>	public void realRun() {
534	>	lock.writeLock().lock();
535	>	lock.writeLock().unlock();
536	>	}});
537	>
538	>	t1.start();
539	>	t2.start();
540	>	lock.readLock().lock();
541	>	lock.readLock().unlock();
542	>	Thread.sleep(SHORT_DELAY_MS);
543	>	lock.readLock().lock();
544	>	lock.readLock().unlock();
545	>	lock.writeLock().unlock();
546	>	t1.join(MEDIUM_DELAY_MS);
547	>	t2.join(MEDIUM_DELAY_MS);
548	>	assertTrue(!t1.isAlive());
549	>	assertTrue(!t2.isAlive());
550	>	}
551	>
552	>
553	>	/**
554	>	* Fair Write lock succeeds if write locked by current thread even if
555	>	* other threads are waiting for writelock
556	>	*/
557	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
558	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
559	>	lock.writeLock().lock();
560	>	Thread t1 = new Thread(new CheckedRunnable() {
561	>	public void realRun() {
562	>	lock.writeLock().lock();
563	>	lock.writeLock().unlock();
564	>	}});
565	>	Thread t2 = new Thread(new CheckedRunnable() {
566	>	public void realRun() {
567	>	lock.writeLock().lock();
568	>	lock.writeLock().unlock();
569	>	}});
570	>
571	>	t1.start();
572	>	t2.start();
573	>	Thread.sleep(SHORT_DELAY_MS);
574	>	assertTrue(lock.isWriteLockedByCurrentThread());
575	>	assertTrue(lock.getWriteHoldCount() == 1);
576	>	lock.writeLock().lock();
577	>	assertTrue(lock.getWriteHoldCount() == 2);
578	>	lock.writeLock().unlock();
579	>	lock.writeLock().lock();
580	>	lock.writeLock().unlock();
581	>	lock.writeLock().unlock();
582	>	t1.join(MEDIUM_DELAY_MS);
583	>	t2.join(MEDIUM_DELAY_MS);
584	>	assertTrue(!t1.isAlive());
585	>	assertTrue(!t2.isAlive());
586	>	}
587	>
588	>
589	>	/**
590	>	* Read tryLock succeeds if readlocked but not writelocked
591	>	*/
592	>	public void testTryLockWhenReadLocked() throws InterruptedException {
593	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
594	>	lock.readLock().lock();
595	>	Thread t = new Thread(new CheckedRunnable() {
596	>	public void realRun() {
597	>	threadAssertTrue(lock.readLock().tryLock());
598	>	lock.readLock().unlock();
599	>	}});
600	>
601	>	t.start();
602	>	t.join();
603	>	lock.readLock().unlock();
604	>	}
605	>
606	>
607	>
608	>	/**
609	>	* write tryLock fails when readlocked
610	>	*/
611	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
612	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
613	>	lock.readLock().lock();
614	>	Thread t = new Thread(new CheckedRunnable() {
615	>	public void realRun() {
616	>	threadAssertFalse(lock.writeLock().tryLock());
617	>	}});
618	>
619	>	t.start();
620	>	t.join();
621	>	lock.readLock().unlock();
622	>	}
623	>
624	>
625	>	/**
626	>	* Fair Read tryLock succeeds if readlocked but not writelocked
627	>	*/
628	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
629	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
630	>	lock.readLock().lock();
631	>	Thread t = new Thread(new CheckedRunnable() {
632	>	public void realRun() {
633	>	threadAssertTrue(lock.readLock().tryLock());
634	>	lock.readLock().unlock();
635	>	}});
636	>
637	>	t.start();
638	>	t.join();
639	>	lock.readLock().unlock();
640	>	}
641	>
642	>
643	>
644	>	/**
645	>	* Fair write tryLock fails when readlocked
646	>	*/
647	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
648	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
649	>	lock.readLock().lock();
650	>	Thread t = new Thread(new CheckedRunnable() {
651	>	public void realRun() {
652	>	threadAssertFalse(lock.writeLock().tryLock());
653	>	}});
654	>
655	>	t.start();
656	>	t.join();
657	>	lock.readLock().unlock();
658	>	}
659	>
660	>
661	>
662	>	/**
663	>	* write timed tryLock times out if locked
664	>	*/
665	>	public void testWriteTryLock_Timeout() throws InterruptedException {
666	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
667	>	lock.writeLock().lock();
668	>	Thread t = new Thread(new CheckedRunnable() {
669	>	public void realRun() throws InterruptedException {
670	>	threadAssertFalse(lock.writeLock().tryLock(1, MILLISECONDS));
671	>	}});
672	>
673	>	t.start();
674	>	t.join();
675	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
676	>	lock.writeLock().unlock();
677	>	}
678	>
679	>	/**
680	>	* read timed tryLock times out if write-locked
681	>	*/
682	>	public void testReadTryLock_Timeout() throws InterruptedException {
683	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
684	>	lock.writeLock().lock();
685	>	Thread t = new Thread(new CheckedRunnable() {
686	>	public void realRun() throws InterruptedException {
687	>	threadAssertFalse(lock.readLock().tryLock(1, MILLISECONDS));
688	>	}});
689	>
690	>	t.start();
691	>	t.join();
692	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
693	>	lock.writeLock().unlock();
694	>	}
695	>
696	>
697	>	/**
698	>	* write lockInterruptibly succeeds if lock free else is interruptible
699	>	*/
700	>	public void testWriteLockInterruptibly() throws InterruptedException {
701	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
702	>	lock.writeLock().lockInterruptibly();
703	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
704	>	public void realRun() throws InterruptedException {
705	>	lock.writeLock().lockInterruptibly();
706	>	}});
707	>
708	>	t.start();
709	>	Thread.sleep(SHORT_DELAY_MS);
710	>	t.interrupt();
711	>	Thread.sleep(SHORT_DELAY_MS);
712	>	t.join();
713	>	lock.writeLock().unlock();
714	>	}
715	>
716	>	/**
717	>	*  read lockInterruptibly succeeds if lock free else is interruptible
718	>	*/
719	>	public void testReadLockInterruptibly() throws InterruptedException {
720	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
721	>	lock.writeLock().lockInterruptibly();
722	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
723	>	public void realRun() throws InterruptedException {
724	>	lock.readLock().lockInterruptibly();
725	>	}});
726	>
727	>	t.start();
728	>	Thread.sleep(SHORT_DELAY_MS);
729	>	t.interrupt();
730	>	t.join();
731	>	lock.writeLock().unlock();
732	>	}
733	>
734	>	/**
735	>	* Calling await without holding lock throws IllegalMonitorStateException
736	>	*/
737	>	public void testAwait_IllegalMonitor() throws InterruptedException {
738	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
739		final Condition c = lock.writeLock().newCondition();
740		try {
741		c.await();
742	<	fail("should throw");
743	<	}
387	<	catch (IllegalMonitorStateException success) {
388	<	}
389	<	catch (Exception ex) {
390	<	fail("should throw IMSE");
391	<	}
742	>	shouldThrow();
743	>	} catch (IllegalMonitorStateException success) {}
744		}
745
746	+	/**
747	+	* Calling signal without holding lock throws IllegalMonitorStateException
748	+	*/
749		public void testSignal_IllegalMonitor() {
750	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
750	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
751		final Condition c = lock.writeLock().newCondition();
752		try {
753		c.signal();
754	<	fail("should throw");
755	<	}
401	<	catch (IllegalMonitorStateException success) {
402	<	}
403	<	catch (Exception ex) {
404	<	fail("should throw IMSE");
405	<	}
754	>	shouldThrow();
755	>	} catch (IllegalMonitorStateException success) {}
756		}
757
758	<	public void testAwaitNanos_Timeout() {
759	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
758	>	/**
759	>	* awaitNanos without a signal times out
760	>	*/
761	>	public void testAwaitNanos_Timeout() throws InterruptedException {
762	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
763		final Condition c = lock.writeLock().newCondition();
764	<	try {
765	<	lock.writeLock().lock();
766	<	long t = c.awaitNanos(100);
767	<	assertTrue(t <= 0);
768	<	lock.writeLock().unlock();
416	<	}
417	<	catch (Exception ex) {
418	<	fail("unexpected exception");
419	<	}
764	>
765	>	lock.writeLock().lock();
766	>	long t = c.awaitNanos(100);
767	>	assertTrue(t <= 0);
768	>	lock.writeLock().unlock();
769		}
770
771	<	public void testAwait_Timeout() {
772	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
771	>
772	>	/**
773	>	*  timed await without a signal times out
774	>	*/
775	>	public void testAwait_Timeout() throws InterruptedException {
776	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
777		final Condition c = lock.writeLock().newCondition();
778	<	try {
779	<	lock.writeLock().lock();
780	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
428	<	lock.writeLock().unlock();
429	<	}
430	<	catch (Exception ex) {
431	<	fail("unexpected exception");
432	<	}
778	>	lock.writeLock().lock();
779	>	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
780	>	lock.writeLock().unlock();
781		}
782
783	<	public void testAwaitUntil_Timeout() {
784	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
783	>	/**
784	>	* awaitUntil without a signal times out
785	>	*/
786	>	public void testAwaitUntil_Timeout() throws InterruptedException {
787	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
788		final Condition c = lock.writeLock().newCondition();
789	<	try {
790	<	lock.writeLock().lock();
791	<	java.util.Date d = new java.util.Date();
792	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
442	<	lock.writeLock().unlock();
443	<	}
444	<	catch (Exception ex) {
445	<	fail("unexpected exception");
446	<	}
789	>	lock.writeLock().lock();
790	>	java.util.Date d = new java.util.Date();
791	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
792	>	lock.writeLock().unlock();
793		}
794
795	<	public void testAwait() {
796	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
795	>	/**
796	>	* await returns when signalled
797	>	*/
798	>	public void testAwait() throws InterruptedException {
799	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
800		final Condition c = lock.writeLock().newCondition();
801	<	Thread t = new Thread(new Runnable() {
802	<	public void run() {
803	<	try {
804	<	lock.writeLock().lock();
805	<	c.await();
806	<	lock.writeLock().unlock();
807	<	}
808	<	catch(InterruptedException e) {
809	<	fail("unexpected exception");
810	<	}
811	<	}
812	<	});
801	>	Thread t = new Thread(new CheckedRunnable() {
802	>	public void realRun() throws InterruptedException {
803	>	lock.writeLock().lock();
804	>	c.await();
805	>	lock.writeLock().unlock();
806	>	}});
807	>
808	>	t.start();
809	>	Thread.sleep(SHORT_DELAY_MS);
810	>	lock.writeLock().lock();
811	>	c.signal();
812	>	lock.writeLock().unlock();
813	>	t.join(SHORT_DELAY_MS);
814	>	assertFalse(t.isAlive());
815	>	}
816
817	<	try {
818	<	t.start();
819	<	Thread.sleep(SHORT_DELAY_MS);
820	<	lock.writeLock().lock();
821	<	c.signal();
822	<	lock.writeLock().unlock();
823	<	t.join(SHORT_DELAY_MS);
824	<	assertFalse(t.isAlive());
825	<	}
826	<	catch (Exception ex) {
827	<	fail("unexpected exception");
817	>	/** A helper class for uninterruptible wait tests */
818	>	class UninterruptableThread extends Thread {
819	>	private Lock lock;
820	>	private Condition c;
821	>
822	>	public volatile boolean canAwake = false;
823	>	public volatile boolean interrupted = false;
824	>	public volatile boolean lockStarted = false;
825	>
826	>	public UninterruptableThread(Lock lock, Condition c) {
827	>	this.lock = lock;
828	>	this.c = c;
829	>	}
830	>
831	>	public synchronized void run() {
832	>	lock.lock();
833	>	lockStarted = true;
834	>
835	>	while (!canAwake) {
836	>	c.awaitUninterruptibly();
837	>	}
838	>
839	>	interrupted = isInterrupted();
840	>	lock.unlock();
841		}
842		}
843
844	<	public void testAwaitUninterruptibly() {
845	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
844	>	/**
845	>	* awaitUninterruptibly doesn't abort on interrupt
846	>	*/
847	>	public void testAwaitUninterruptibly() throws InterruptedException {
848	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
849		final Condition c = lock.writeLock().newCondition();
850	<	Thread t = new Thread(new Runnable() {
851	<	public void run() {
852	<	lock.writeLock().lock();
853	<	c.awaitUninterruptibly();
854	<	lock.writeLock().unlock();
855	<	}
856	<	});
850	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
851	>
852	>	thread.start();
853	>
854	>	while (!thread.lockStarted) {
855	>	Thread.sleep(100);
856	>	}
857
858	+	lock.writeLock().lock();
859		try {
860	<	t.start();
861	<	Thread.sleep(SHORT_DELAY_MS);
493	<	t.interrupt();
494	<	lock.writeLock().lock();
860	>	thread.interrupt();
861	>	thread.canAwake = true;
862		c.signal();
863	+	} finally {
864		lock.writeLock().unlock();
497	–	t.join(SHORT_DELAY_MS);
498	–	assertFalse(t.isAlive());
499	–	}
500	–	catch (Exception ex) {
501	–	fail("unexpected exception");
865		}
866	+
867	+	thread.join();
868	+	assertTrue(thread.interrupted);
869	+	assertFalse(thread.isAlive());
870		}
871
872	<	public void testAwait_Interrupt() {
873	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
874	<	final Condition c = lock.writeLock().newCondition();
875	<	Thread t = new Thread(new Runnable() {
876	<	public void run() {
877	<	try {
878	<	lock.writeLock().lock();
879	<	c.await();
880	<	lock.writeLock().unlock();
881	<	fail("should throw");
882	<	}
883	<	catch(InterruptedException success) {
884	<	}
885	<	}
886	<	});
887	<
888	<	try {
889	<	t.start();
890	<	Thread.sleep(SHORT_DELAY_MS);
891	<	t.interrupt();
892	<	t.join(SHORT_DELAY_MS);
893	<	assertFalse(t.isAlive());
894	<	}
895	<	catch (Exception ex) {
896	<	fail("unexpected exception");
897	<	}
898	<	}
899	<
900	<	public void testAwaitNanos_Interrupt() {
901	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
902	<	final Condition c = lock.writeLock().newCondition();
903	<	Thread t = new Thread(new Runnable() {
904	<	public void run() {
905	<	try {
906	<	lock.writeLock().lock();
907	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
908	<	lock.writeLock().unlock();
909	<	fail("should throw");
910	<	}
911	<	catch(InterruptedException success) {
912	<	}
913	<	}
914	<	});
915	<
916	<	try {
917	<	t.start();
918	<	Thread.sleep(SHORT_DELAY_MS);
919	<	t.interrupt();
920	<	t.join(SHORT_DELAY_MS);
921	<	assertFalse(t.isAlive());
922	<	}
923	<	catch (Exception ex) {
924	<	fail("unexpected exception");
925	<	}
926	<	}
927	<
928	<	public void testAwaitUntil_Interrupt() {
929	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
930	<	final Condition c = lock.writeLock().newCondition();
564	<	Thread t = new Thread(new Runnable() {
565	<	public void run() {
566	<	try {
567	<	lock.writeLock().lock();
568	<	java.util.Date d = new java.util.Date();
569	<	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
570	<	lock.writeLock().unlock();
571	<	fail("should throw");
572	<	}
573	<	catch(InterruptedException success) {
574	<	}
575	<	}
576	<	});
577	<
578	<	try {
579	<	t.start();
580	<	Thread.sleep(SHORT_DELAY_MS);
581	<	t.interrupt();
582	<	t.join(SHORT_DELAY_MS);
583	<	assertFalse(t.isAlive());
584	<	}
585	<	catch (Exception ex) {
586	<	fail("unexpected exception");
587	<	}
588	<	}
589	<
590	<	public void testSignalAll() {
591	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
592	<	final Condition c = lock.writeLock().newCondition();
593	<	Thread t1 = new Thread(new Runnable() {
594	<	public void run() {
595	<	try {
596	<	lock.writeLock().lock();
597	<	c.await();
598	<	lock.writeLock().unlock();
599	<	}
600	<	catch(InterruptedException e) {
601	<	fail("unexpected exception");
602	<	}
603	<	}
604	<	});
605	<
606	<	Thread t2 = new Thread(new Runnable() {
607	<	public void run() {
608	<	try {
609	<	lock.writeLock().lock();
610	<	c.await();
611	<	lock.writeLock().unlock();
612	<	}
613	<	catch(InterruptedException e) {
614	<	fail("unexpected exception");
615	<	}
616	<	}
617	<	});
618	<
619	<	try {
620	<	t1.start();
621	<	t2.start();
622	<	Thread.sleep(SHORT_DELAY_MS);
623	<	lock.writeLock().lock();
624	<	c.signalAll();
625	<	lock.writeLock().unlock();
626	<	t1.join(SHORT_DELAY_MS);
627	<	t2.join(SHORT_DELAY_MS);
628	<	assertFalse(t1.isAlive());
629	<	assertFalse(t2.isAlive());
630	<	}
631	<	catch (Exception ex) {
632	<	fail("unexpected exception");
633	<	}
872	>	/**
873	>	* await is interruptible
874	>	*/
875	>	public void testAwait_Interrupt() throws InterruptedException {
876	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
877	>	final Condition c = lock.writeLock().newCondition();
878	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
879	>	public void realRun() throws InterruptedException {
880	>	lock.writeLock().lock();
881	>	c.await();
882	>	lock.writeLock().unlock();
883	>	}});
884	>
885	>	t.start();
886	>	Thread.sleep(SHORT_DELAY_MS);
887	>	t.interrupt();
888	>	t.join(SHORT_DELAY_MS);
889	>	assertFalse(t.isAlive());
890	>	}
891	>
892	>	/**
893	>	* awaitNanos is interruptible
894	>	*/
895	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
896	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
897	>	final Condition c = lock.writeLock().newCondition();
898	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
899	>	public void realRun() throws InterruptedException {
900	>	lock.writeLock().lock();
901	>	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
902	>	lock.writeLock().unlock();
903	>	}});
904	>
905	>	t.start();
906	>	Thread.sleep(SHORT_DELAY_MS);
907	>	t.interrupt();
908	>	t.join(SHORT_DELAY_MS);
909	>	assertFalse(t.isAlive());
910	>	}
911	>
912	>	/**
913	>	* awaitUntil is interruptible
914	>	*/
915	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
916	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
917	>	final Condition c = lock.writeLock().newCondition();
918	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
919	>	public void realRun() throws InterruptedException {
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	>	}});
925	>
926	>	t.start();
927	>	Thread.sleep(SHORT_DELAY_MS);
928	>	t.interrupt();
929	>	t.join(SHORT_DELAY_MS);
930	>	assertFalse(t.isAlive());
931		}
932
933	<	public void testSerialization() {
933	>	/**
934	>	* signalAll wakes up all threads
935	>	*/
936	>	public void testSignalAll() throws InterruptedException {
937	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
938	>	final Condition c = lock.writeLock().newCondition();
939	>	Thread t1 = new Thread(new CheckedRunnable() {
940	>	public void realRun() throws InterruptedException {
941	>	lock.writeLock().lock();
942	>	c.await();
943	>	lock.writeLock().unlock();
944	>	}});
945	>
946	>	Thread t2 = new Thread(new CheckedRunnable() {
947	>	public void realRun() throws InterruptedException {
948	>	lock.writeLock().lock();
949	>	c.await();
950	>	lock.writeLock().unlock();
951	>	}});
952	>
953	>	t1.start();
954	>	t2.start();
955	>	Thread.sleep(SHORT_DELAY_MS);
956	>	lock.writeLock().lock();
957	>	c.signalAll();
958	>	lock.writeLock().unlock();
959	>	t1.join(SHORT_DELAY_MS);
960	>	t2.join(SHORT_DELAY_MS);
961	>	assertFalse(t1.isAlive());
962	>	assertFalse(t2.isAlive());
963	>	}
964	>
965	>	/**
966	>	* A serialized lock deserializes as unlocked
967	>	*/
968	>	public void testSerialization() throws Exception {
969		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
970		l.readLock().lock();
971		l.readLock().unlock();
972
973	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
974	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
975	+	out.writeObject(l);
976	+	out.close();
977	+
978	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
979	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
980	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
981	+	r.readLock().lock();
982	+	r.readLock().unlock();
983	+	}
984	+
985	+	/**
986	+	* hasQueuedThreads reports whether there are waiting threads
987	+	*/
988	+	public void testhasQueuedThreads() throws InterruptedException {
989	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
990	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
991	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
992	+	assertFalse(lock.hasQueuedThreads());
993	+	lock.writeLock().lock();
994	+	t1.start();
995	+	Thread.sleep(SHORT_DELAY_MS);
996	+	assertTrue(lock.hasQueuedThreads());
997	+	t2.start();
998	+	Thread.sleep(SHORT_DELAY_MS);
999	+	assertTrue(lock.hasQueuedThreads());
1000	+	t1.interrupt();
1001	+	Thread.sleep(SHORT_DELAY_MS);
1002	+	assertTrue(lock.hasQueuedThreads());
1003	+	lock.writeLock().unlock();
1004	+	Thread.sleep(SHORT_DELAY_MS);
1005	+	assertFalse(lock.hasQueuedThreads());
1006	+	t1.join();
1007	+	t2.join();
1008	+	}
1009	+
1010	+	/**
1011	+	* hasQueuedThread(null) throws NPE
1012	+	*/
1013	+	public void testHasQueuedThreadNPE() {
1014	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1015		try {
1016	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1017	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1018	<	out.writeObject(l);
645	<	out.close();
646	<
647	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
648	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
649	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
650	<	r.readLock().lock();
651	<	r.readLock().unlock();
652	<	} catch(Exception e){
653	<	e.printStackTrace();
654	<	fail("unexpected exception");
655	<	}
1016	>	sync.hasQueuedThread(null);
1017	>	shouldThrow();
1018	>	} catch (NullPointerException success) {}
1019		}
1020
1021	+	/**
1022	+	* hasQueuedThread reports whether a thread is queued.
1023	+	*/
1024	+	public void testHasQueuedThread() throws InterruptedException {
1025	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1026	+	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1027	+	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1028	+	assertFalse(sync.hasQueuedThread(t1));
1029	+	assertFalse(sync.hasQueuedThread(t2));
1030	+	sync.writeLock().lock();
1031	+	t1.start();
1032	+	Thread.sleep(SHORT_DELAY_MS);
1033	+	assertTrue(sync.hasQueuedThread(t1));
1034	+	t2.start();
1035	+	Thread.sleep(SHORT_DELAY_MS);
1036	+	assertTrue(sync.hasQueuedThread(t1));
1037	+	assertTrue(sync.hasQueuedThread(t2));
1038	+	t1.interrupt();
1039	+	Thread.sleep(SHORT_DELAY_MS);
1040	+	assertFalse(sync.hasQueuedThread(t1));
1041	+	assertTrue(sync.hasQueuedThread(t2));
1042	+	sync.writeLock().unlock();
1043	+	Thread.sleep(SHORT_DELAY_MS);
1044	+	assertFalse(sync.hasQueuedThread(t1));
1045	+	Thread.sleep(SHORT_DELAY_MS);
1046	+	assertFalse(sync.hasQueuedThread(t2));
1047	+	t1.join();
1048	+	t2.join();
1049	+	}
1050	+
1051	+
1052	+	/**
1053	+	* getQueueLength reports number of waiting threads
1054	+	*/
1055	+	public void testGetQueueLength() throws InterruptedException {
1056	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1057	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1058	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1059	+	assertEquals(0, lock.getQueueLength());
1060	+	lock.writeLock().lock();
1061	+	t1.start();
1062	+	Thread.sleep(SHORT_DELAY_MS);
1063	+	assertEquals(1, lock.getQueueLength());
1064	+	t2.start();
1065	+	Thread.sleep(SHORT_DELAY_MS);
1066	+	assertEquals(2, lock.getQueueLength());
1067	+	t1.interrupt();
1068	+	Thread.sleep(SHORT_DELAY_MS);
1069	+	assertEquals(1, lock.getQueueLength());
1070	+	lock.writeLock().unlock();
1071	+	Thread.sleep(SHORT_DELAY_MS);
1072	+	assertEquals(0, lock.getQueueLength());
1073	+	t1.join();
1074	+	t2.join();
1075	+	}
1076	+
1077	+	/**
1078	+	* getQueuedThreads includes waiting threads
1079	+	*/
1080	+	public void testGetQueuedThreads() throws InterruptedException {
1081	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1082	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1083	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1084	+	assertTrue(lock.getQueuedThreads().isEmpty());
1085	+	lock.writeLock().lock();
1086	+	assertTrue(lock.getQueuedThreads().isEmpty());
1087	+	t1.start();
1088	+	Thread.sleep(SHORT_DELAY_MS);
1089	+	assertTrue(lock.getQueuedThreads().contains(t1));
1090	+	t2.start();
1091	+	Thread.sleep(SHORT_DELAY_MS);
1092	+	assertTrue(lock.getQueuedThreads().contains(t1));
1093	+	assertTrue(lock.getQueuedThreads().contains(t2));
1094	+	t1.interrupt();
1095	+	Thread.sleep(SHORT_DELAY_MS);
1096	+	assertFalse(lock.getQueuedThreads().contains(t1));
1097	+	assertTrue(lock.getQueuedThreads().contains(t2));
1098	+	lock.writeLock().unlock();
1099	+	Thread.sleep(SHORT_DELAY_MS);
1100	+	assertTrue(lock.getQueuedThreads().isEmpty());
1101	+	t1.join();
1102	+	t2.join();
1103	+	}
1104	+
1105	+	/**
1106	+	* hasWaiters throws NPE if null
1107	+	*/
1108	+	public void testHasWaitersNPE() {
1109	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1110	+	try {
1111	+	lock.hasWaiters(null);
1112	+	shouldThrow();
1113	+	} catch (NullPointerException success) {}
1114	+	}
1115	+
1116	+	/**
1117	+	* getWaitQueueLength throws NPE if null
1118	+	*/
1119	+	public void testGetWaitQueueLengthNPE() {
1120	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1121	+	try {
1122	+	lock.getWaitQueueLength(null);
1123	+	shouldThrow();
1124	+	} catch (NullPointerException success) {}
1125	+	}
1126	+
1127	+
1128	+	/**
1129	+	* getWaitingThreads throws NPE if null
1130	+	*/
1131	+	public void testGetWaitingThreadsNPE() {
1132	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1133	+	try {
1134	+	lock.getWaitingThreads(null);
1135	+	shouldThrow();
1136	+	} catch (NullPointerException success) {}
1137	+	}
1138	+
1139	+	/**
1140	+	* hasWaiters throws IAE if not owned
1141	+	*/
1142	+	public void testHasWaitersIAE() {
1143	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1144	+	final Condition c = lock.writeLock().newCondition();
1145	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1146	+	try {
1147	+	lock2.hasWaiters(c);
1148	+	shouldThrow();
1149	+	} catch (IllegalArgumentException success) {}
1150	+	}
1151	+
1152	+	/**
1153	+	* hasWaiters throws IMSE if not locked
1154	+	*/
1155	+	public void testHasWaitersIMSE() {
1156	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1157	+	final Condition c = lock.writeLock().newCondition();
1158	+	try {
1159	+	lock.hasWaiters(c);
1160	+	shouldThrow();
1161	+	} catch (IllegalMonitorStateException success) {}
1162	+	}
1163	+
1164	+
1165	+	/**
1166	+	* getWaitQueueLength throws IAE if not owned
1167	+	*/
1168	+	public void testGetWaitQueueLengthIAE() {
1169	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1170	+	final Condition c = lock.writeLock().newCondition();
1171	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1172	+	try {
1173	+	lock2.getWaitQueueLength(c);
1174	+	shouldThrow();
1175	+	} catch (IllegalArgumentException success) {}
1176	+	}
1177	+
1178	+	/**
1179	+	* getWaitQueueLength throws IMSE if not locked
1180	+	*/
1181	+	public void testGetWaitQueueLengthIMSE() {
1182	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1183	+	final Condition c = lock.writeLock().newCondition();
1184	+	try {
1185	+	lock.getWaitQueueLength(c);
1186	+	shouldThrow();
1187	+	} catch (IllegalMonitorStateException success) {}
1188	+	}
1189	+
1190	+
1191	+	/**
1192	+	* getWaitingThreads throws IAE if not owned
1193	+	*/
1194	+	public void testGetWaitingThreadsIAE() {
1195	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1196	+	final Condition c = lock.writeLock().newCondition();
1197	+	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1198	+	try {
1199	+	lock2.getWaitingThreads(c);
1200	+	shouldThrow();
1201	+	} catch (IllegalArgumentException success) {}
1202	+	}
1203	+
1204	+	/**
1205	+	* getWaitingThreads throws IMSE if not locked
1206	+	*/
1207	+	public void testGetWaitingThreadsIMSE() {
1208	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1209	+	final Condition c = lock.writeLock().newCondition();
1210	+	try {
1211	+	lock.getWaitingThreads(c);
1212	+	shouldThrow();
1213	+	} catch (IllegalMonitorStateException success) {}
1214	+	}
1215	+
1216	+
1217	+	/**
1218	+	* hasWaiters returns true when a thread is waiting, else false
1219	+	*/
1220	+	public void testHasWaiters() throws InterruptedException {
1221	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1222	+	final Condition c = lock.writeLock().newCondition();
1223	+	Thread t = new Thread(new CheckedRunnable() {
1224	+	public void realRun() throws InterruptedException {
1225	+	lock.writeLock().lock();
1226	+	threadAssertFalse(lock.hasWaiters(c));
1227	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1228	+	c.await();
1229	+	lock.writeLock().unlock();
1230	+	}});
1231	+
1232	+	t.start();
1233	+	Thread.sleep(SHORT_DELAY_MS);
1234	+	lock.writeLock().lock();
1235	+	assertTrue(lock.hasWaiters(c));
1236	+	assertEquals(1, lock.getWaitQueueLength(c));
1237	+	c.signal();
1238	+	lock.writeLock().unlock();
1239	+	Thread.sleep(SHORT_DELAY_MS);
1240	+	lock.writeLock().lock();
1241	+	assertFalse(lock.hasWaiters(c));
1242	+	assertEquals(0, lock.getWaitQueueLength(c));
1243	+	lock.writeLock().unlock();
1244	+	t.join(SHORT_DELAY_MS);
1245	+	assertFalse(t.isAlive());
1246	+	}
1247	+
1248	+	/**
1249	+	* getWaitQueueLength returns number of waiting threads
1250	+	*/
1251	+	public void testGetWaitQueueLength() throws InterruptedException {
1252	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1253	+	final Condition c = lock.writeLock().newCondition();
1254	+	Thread t = new Thread(new CheckedRunnable() {
1255	+	public void realRun() throws InterruptedException {
1256	+	lock.writeLock().lock();
1257	+	threadAssertFalse(lock.hasWaiters(c));
1258	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1259	+	c.await();
1260	+	lock.writeLock().unlock();
1261	+	}});
1262	+
1263	+	t.start();
1264	+	Thread.sleep(SHORT_DELAY_MS);
1265	+	lock.writeLock().lock();
1266	+	assertTrue(lock.hasWaiters(c));
1267	+	assertEquals(1, lock.getWaitQueueLength(c));
1268	+	c.signal();
1269	+	lock.writeLock().unlock();
1270	+	Thread.sleep(SHORT_DELAY_MS);
1271	+	lock.writeLock().lock();
1272	+	assertFalse(lock.hasWaiters(c));
1273	+	assertEquals(0, lock.getWaitQueueLength(c));
1274	+	lock.writeLock().unlock();
1275	+	t.join(SHORT_DELAY_MS);
1276	+	assertFalse(t.isAlive());
1277	+	}
1278	+
1279	+
1280	+	/**
1281	+	* getWaitingThreads returns only and all waiting threads
1282	+	*/
1283	+	public void testGetWaitingThreads() throws InterruptedException {
1284	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1285	+	final Condition c = lock.writeLock().newCondition();
1286	+	Thread t1 = new Thread(new CheckedRunnable() {
1287	+	public void realRun() throws InterruptedException {
1288	+	lock.writeLock().lock();
1289	+	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1290	+	c.await();
1291	+	lock.writeLock().unlock();
1292	+	}});
1293	+
1294	+	Thread t2 = new Thread(new CheckedRunnable() {
1295	+	public void realRun() throws InterruptedException {
1296	+	lock.writeLock().lock();
1297	+	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1298	+	c.await();
1299	+	lock.writeLock().unlock();
1300	+	}});
1301	+
1302	+	lock.writeLock().lock();
1303	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1304	+	lock.writeLock().unlock();
1305	+	t1.start();
1306	+	Thread.sleep(SHORT_DELAY_MS);
1307	+	t2.start();
1308	+	Thread.sleep(SHORT_DELAY_MS);
1309	+	lock.writeLock().lock();
1310	+	assertTrue(lock.hasWaiters(c));
1311	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1312	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1313	+	c.signalAll();
1314	+	lock.writeLock().unlock();
1315	+	Thread.sleep(SHORT_DELAY_MS);
1316	+	lock.writeLock().lock();
1317	+	assertFalse(lock.hasWaiters(c));
1318	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1319	+	lock.writeLock().unlock();
1320	+	t1.join(SHORT_DELAY_MS);
1321	+	t2.join(SHORT_DELAY_MS);
1322	+	assertFalse(t1.isAlive());
1323	+	assertFalse(t2.isAlive());
1324	+	}
1325	+
1326	+	/**
1327	+	* toString indicates current lock state
1328	+	*/
1329	+	public void testToString() {
1330	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1331	+	String us = lock.toString();
1332	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1333	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1334	+	lock.writeLock().lock();
1335	+	String ws = lock.toString();
1336	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1337	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1338	+	lock.writeLock().unlock();
1339	+	lock.readLock().lock();
1340	+	lock.readLock().lock();
1341	+	String rs = lock.toString();
1342	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1343	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1344	+	}
1345	+
1346	+	/**
1347	+	* readLock.toString indicates current lock state
1348	+	*/
1349	+	public void testReadLockToString() {
1350	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1351	+	String us = lock.readLock().toString();
1352	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1353	+	lock.readLock().lock();
1354	+	lock.readLock().lock();
1355	+	String rs = lock.readLock().toString();
1356	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1357	+	}
1358	+
1359	+	/**
1360	+	* writeLock.toString indicates current lock state
1361	+	*/
1362	+	public void testWriteLockToString() {
1363	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1364	+	String us = lock.writeLock().toString();
1365	+	assertTrue(us.indexOf("Unlocked") >= 0);
1366	+	lock.writeLock().lock();
1367	+	String ls = lock.writeLock().toString();
1368	+	assertTrue(ls.indexOf("Locked") >= 0);
1369	+	}
1370
1371		}

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