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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 1.55 by jsr166, Mon May 2 01:15:26 2011 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
2	>	* Written by Doug Lea with assistance from members of JCP JSR-166
3	>	* Expert Group and released to the public domain, as explained at
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9		import junit.framework.*;
10		import java.util.concurrent.locks.*;
11		import java.util.concurrent.*;
12	+	import 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	+	* Releases write lock, checking that it had a hold count of 1.
63	+	*/
64	+	void releaseWriteLock(ReentrantReadWriteLock lock) {
65	+	ReentrantReadWriteLock.WriteLock writeLock = lock.writeLock();
66	+	assertTrue(writeLock.isHeldByCurrentThread());
67	+	writeLock.unlock();
68	+	assertFalse(writeLock.isHeldByCurrentThread());
69	+	}
70
71	+	/**
72	+	* Constructor sets given fairness, and is in unlocked state
73	+	*/
74	+	public void testConstructor() {
75	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
76	+	assertFalse(rl.isFair());
77	+	assertFalse(rl.isWriteLocked());
78	+	assertEquals(0, rl.getReadLockCount());
79	+	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
80	+	assertTrue(r2.isFair());
81	+	assertFalse(r2.isWriteLocked());
82	+	assertEquals(0, r2.getReadLockCount());
83	+	ReentrantReadWriteLock r3 = new ReentrantReadWriteLock(false);
84	+	assertFalse(r3.isFair());
85	+	assertFalse(r3.isWriteLocked());
86	+	assertEquals(0, r3.getReadLockCount());
87	+	}
88
89	<	public void testInterruptedException(){
90	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
91	<	lock.writeLock().lock();
92	<	Thread t = new Thread(new Runnable() {
93	<	public void run(){
94	<	try{
95	<	lock.writeLock().lockInterruptibly();
96	<	fail("should throw");
97	<	}catch(InterruptedException success){}
98	<	}
99	<	});
100	<	try {
101	<	t.start();
102	<	t.interrupt();
103	<	lock.writeLock().unlock();
104	<	t.join();
105	<	} catch(Exception e){
106	<	fail("unexpected exception");
107	<	}
108	<	}
109	<
110	<	public void testInterruptedException2(){
111	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
68	<	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	<	}
89	>	/**
90	>	* write-locking and read-locking an unlocked lock succeed
91	>	*/
92	>	public void testLock() {
93	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
94	>	rl.writeLock().lock();
95	>	assertTrue(rl.isWriteLocked());
96	>	assertTrue(rl.isWriteLockedByCurrentThread());
97	>	assertTrue(rl.writeLock().isHeldByCurrentThread());
98	>	assertEquals(0, rl.getReadLockCount());
99	>	rl.writeLock().unlock();
100	>	assertFalse(rl.isWriteLocked());
101	>	assertFalse(rl.isWriteLockedByCurrentThread());
102	>	assertFalse(rl.writeLock().isHeldByCurrentThread());
103	>	assertEquals(0, rl.getReadLockCount());
104	>	rl.readLock().lock();
105	>	assertFalse(rl.isWriteLocked());
106	>	assertFalse(rl.isWriteLockedByCurrentThread());
107	>	assertEquals(1, rl.getReadLockCount());
108	>	rl.readLock().unlock();
109	>	assertFalse(rl.isWriteLocked());
110	>	assertFalse(rl.isWriteLockedByCurrentThread());
111	>	assertEquals(0, rl.getReadLockCount());
112		}
113
114	<	public void testInterruptedException3(){
115	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
116	<	lock.writeLock().lock();
117	<	Thread t = new Thread(new Runnable() {
118	<	public void run(){
119	<	try{
120	<	lock.readLock().lockInterruptibly();
121	<	fail("should throw");
122	<	}catch(InterruptedException success){}
123	<	}
124	<	});
125	<	try {
126	<	t.start();
127	<	t.interrupt();
128	<	lock.writeLock().unlock();
129	<	t.join();
130	<	} catch(Exception e){
131	<	fail("unexpected exception");
132	<	}
133	<	}
134	<
135	<	public void testInterruptedException4(){
136	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
137	<	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");
125	<	}
114	>
115	>	/**
116	>	* locking an unlocked fair lock succeeds
117	>	*/
118	>	public void testFairLock() {
119	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
120	>	rl.writeLock().lock();
121	>	assertTrue(rl.isWriteLocked());
122	>	assertTrue(rl.isWriteLockedByCurrentThread());
123	>	assertTrue(rl.writeLock().isHeldByCurrentThread());
124	>	assertEquals(0, rl.getReadLockCount());
125	>	rl.writeLock().unlock();
126	>	assertFalse(rl.isWriteLocked());
127	>	assertFalse(rl.isWriteLockedByCurrentThread());
128	>	assertFalse(rl.writeLock().isHeldByCurrentThread());
129	>	assertEquals(0, rl.getReadLockCount());
130	>	rl.readLock().lock();
131	>	assertFalse(rl.isWriteLocked());
132	>	assertFalse(rl.isWriteLockedByCurrentThread());
133	>	assertEquals(1, rl.getReadLockCount());
134	>	rl.readLock().unlock();
135	>	assertFalse(rl.isWriteLocked());
136	>	assertFalse(rl.isWriteLockedByCurrentThread());
137	>	assertEquals(0, rl.getReadLockCount());
138		}
139
140	<
141	<	public void testTryLockWhenLocked() {
142	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
143	<	lock.writeLock().lock();
144	<	Thread t = new Thread(new Runnable() {
145	<	public void run(){
146	<	assertFalse(lock.writeLock().tryLock());
147	<	}
148	<	});
149	<	try {
138	<	t.start();
139	<	t.join();
140	>	/**
141	>	* getWriteHoldCount returns number of recursive holds
142	>	*/
143	>	public void testGetWriteHoldCount() {
144	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
145	>	for (int i = 1; i <= SIZE; i++) {
146	>	lock.writeLock().lock();
147	>	assertEquals(i,lock.getWriteHoldCount());
148	>	}
149	>	for (int i = SIZE; i > 0; i--) {
150		lock.writeLock().unlock();
151	<	} catch(Exception e){
142	<	fail("unexpected exception");
151	>	assertEquals(i-1,lock.getWriteHoldCount());
152		}
153	<	}
153	>	}
154
155	<	public void testTryLockWhenLocked2() {
156	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
157	<	lock.writeLock().lock();
158	<	Thread t = new Thread(new Runnable() {
159	<	public void run(){
160	<	assertFalse(lock.readLock().tryLock());
161	<	}
162	<	});
163	<	try {
164	<	t.start();
156	<	t.join();
155	>	/**
156	>	* WriteLock.getHoldCount returns number of recursive holds
157	>	*/
158	>	public void testGetHoldCount() {
159	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
160	>	for (int i = 1; i <= SIZE; i++) {
161	>	lock.writeLock().lock();
162	>	assertEquals(i,lock.writeLock().getHoldCount());
163	>	}
164	>	for (int i = SIZE; i > 0; i--) {
165		lock.writeLock().unlock();
166	<	} catch(Exception e){
159	<	fail("unexpected exception");
166	>	assertEquals(i-1,lock.writeLock().getHoldCount());
167		}
168	<	}
168	>	}
169
170	<	public void testMultipleReadLocks() {
171	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
172	<	lock.readLock().lock();
173	<	Thread t = new Thread(new Runnable() {
174	<	public void run(){
175	<	assertTrue(lock.readLock().tryLock());
176	<	lock.readLock().unlock();
177	<	}
171	<	});
172	<	try {
173	<	t.start();
174	<	t.join();
175	<	lock.readLock().unlock();
176	<	} catch(Exception e){
177	<	fail("unexpected exception");
170	>	/**
171	>	* getReadHoldCount returns number of recursive holds
172	>	*/
173	>	public void testGetReadHoldCount() {
174	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
175	>	for (int i = 1; i <= SIZE; i++) {
176	>	lock.readLock().lock();
177	>	assertEquals(i,lock.getReadHoldCount());
178		}
179	<	}
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);
201	<	lock.readLock().unlock();
202	<	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();
179	>	for (int i = SIZE; i > 0; i--) {
180		lock.readLock().unlock();
181	<	} catch(Exception e){
258	<	fail("unexpected exception");
181	>	assertEquals(i-1,lock.getReadHoldCount());
182		}
183	<	}
183	>	}
184
262	–
185
186	<	public void testWriteTryLockWhenReadLocked() {
187	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
188	<	lock.readLock().lock();
189	<	Thread t = new Thread(new Runnable() {
190	<	public void run(){
269	<	assertFalse(lock.writeLock().tryLock());
270	<	}
271	<	});
186	>	/**
187	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
188	>	*/
189	>	public void testUnlock_IllegalMonitorStateException() {
190	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
191		try {
192	<	t.start();
193	<	t.join();
194	<	lock.readLock().unlock();
195	<	} catch(Exception e){
277	<	fail("unexpected exception");
278	<	}
279	<	}
192	>	rl.writeLock().unlock();
193	>	shouldThrow();
194	>	} catch (IllegalMonitorStateException success) {}
195	>	}
196
281	–
197
198	<	public void testTryLock_Timeout(){
199	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
200	<	lock.writeLock().lock();
201	<	Thread t = new Thread(new Runnable() {
202	<	public void run(){
203	<	try {
204	<	assertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
205	<	} catch (Exception ex) {
206	<	fail("unexpected exception");
207	<	}
208	<	}
209	<	});
210	<	try {
211	<	t.start();
212	<	t.join();
213	<	lock.writeLock().unlock();
299	<	} catch(Exception e){
300	<	fail("unexpected exception");
301	<	}
302	<	}
198	>	/**
199	>	* write-lockInterruptibly is interruptible
200	>	*/
201	>	public void testWriteLockInterruptibly_Interrupted() throws Exception {
202	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
203	>	lock.writeLock().lock();
204	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
205	>	public void realRun() throws InterruptedException {
206	>	lock.writeLock().lockInterruptibly();
207	>	}});
208	>
209	>	Thread.sleep(SHORT_DELAY_MS);
210	>	t.interrupt();
211	>	awaitTermination(t, LONG_DELAY_MS);
212	>	releaseWriteLock(lock);
213	>	}
214
215	<	public void testTryLock_Timeout2(){
216	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
217	<	lock.writeLock().lock();
218	<	Thread t = new Thread(new Runnable() {
219	<	public void run(){
220	<	try {
221	<	assertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
222	<	} catch (Exception ex) {
223	<	fail("unexpected exception");
224	<	}
225	<	}
226	<	});
227	<	try {
228	<	t.start();
229	<	t.join();
230	<	lock.writeLock().unlock();
320	<	} catch(Exception e){
321	<	fail("unexpected exception");
322	<	}
323	<	}
215	>	/**
216	>	* timed write-tryLock is interruptible
217	>	*/
218	>	public void testWriteTryLock_Interrupted() throws InterruptedException {
219	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
220	>	lock.writeLock().lock();
221	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
222	>	public void realRun() throws InterruptedException {
223	>	lock.writeLock().tryLock(SMALL_DELAY_MS, MILLISECONDS);
224	>	}});
225	>
226	>	Thread.sleep(SHORT_DELAY_MS);
227	>	t.interrupt();
228	>	awaitTermination(t, LONG_DELAY_MS);
229	>	releaseWriteLock(lock);
230	>	}
231
232	+	/**
233	+	* read-lockInterruptibly is interruptible
234	+	*/
235	+	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
236	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
237	+	lock.writeLock().lock();
238	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
239	+	public void realRun() throws InterruptedException {
240	+	lock.readLock().lockInterruptibly();
241	+	}});
242	+
243	+	Thread.sleep(SHORT_DELAY_MS);
244	+	t.interrupt();
245	+	awaitTermination(t, LONG_DELAY_MS);
246	+	releaseWriteLock(lock);
247	+	}
248
249	<	public void testLockInterruptibly() {
250	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
251	<	try {
252	<	lock.writeLock().lockInterruptibly();
253	<	} catch(Exception e) {
254	<	fail("unexpected exception");
255	<	}
256	<	Thread t = new Thread(new Runnable() {
257	<	public void run() {
258	<	try {
259	<	lock.writeLock().lockInterruptibly();
260	<	fail("should throw");
261	<	}
262	<	catch(InterruptedException success) {
263	<	}
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	<	}
249	>	/**
250	>	* timed read-tryLock is interruptible
251	>	*/
252	>	public void testReadTryLock_Interrupted() throws InterruptedException {
253	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
254	>	lock.writeLock().lock();
255	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
256	>	public void realRun() throws InterruptedException {
257	>	lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS);
258	>	}});
259	>
260	>	Thread.sleep(SHORT_DELAY_MS);
261	>	t.interrupt();
262	>	awaitTermination(t, LONG_DELAY_MS);
263	>	releaseWriteLock(lock);
264		}
265
266	<	public void testLockInterruptibly2() {
267	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
268	<	try {
269	<	lock.writeLock().lockInterruptibly();
270	<	} catch(Exception e) {
271	<	fail("unexpected exception");
272	<	}
273	<	Thread t = new Thread(new Runnable() {
274	<	public void run() {
275	<	try {
276	<	lock.readLock().lockInterruptibly();
277	<	fail("should throw");
278	<	}
279	<	catch(InterruptedException success) {
280	<	}
281	<	}
282	<	});
283	<	try {
284	<	t.start();
285	<	t.interrupt();
286	<	t.join();
287	<	lock.writeLock().unlock();
288	<	} catch(Exception e){
289	<	fail("unexpected exception");
290	<	}
266	>
267	>	/**
268	>	* write-tryLock fails if locked
269	>	*/
270	>	public void testWriteTryLockWhenLocked() throws InterruptedException {
271	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
272	>	lock.writeLock().lock();
273	>	Thread t = newStartedThread(new CheckedRunnable() {
274	>	public void realRun() {
275	>	assertFalse(lock.writeLock().tryLock());
276	>	}});
277	>
278	>	awaitTermination(t, LONG_DELAY_MS);
279	>	releaseWriteLock(lock);
280	>	}
281	>
282	>	/**
283	>	* read-tryLock fails if locked
284	>	*/
285	>	public void testReadTryLockWhenLocked() throws InterruptedException {
286	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
287	>	lock.writeLock().lock();
288	>	Thread t = newStartedThread(new CheckedRunnable() {
289	>	public void realRun() {
290	>	assertFalse(lock.readLock().tryLock());
291	>	}});
292	>
293	>	awaitTermination(t, LONG_DELAY_MS);
294	>	releaseWriteLock(lock);
295	>	}
296	>
297	>	/**
298	>	* Multiple threads can hold a read lock when not write-locked
299	>	*/
300	>	public void testMultipleReadLocks() throws InterruptedException {
301	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
302	>	lock.readLock().lock();
303	>	Thread t = newStartedThread(new CheckedRunnable() {
304	>	public void realRun() {
305	>	assertTrue(lock.readLock().tryLock());
306	>	lock.readLock().unlock();
307	>	}});
308	>
309	>	awaitTermination(t, LONG_DELAY_MS);
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 = newStartedThread(new CheckedRunnable() {
320	>	public void realRun() {
321	>	lock.readLock().lock();
322	>	lock.readLock().unlock();
323	>	}});
324	>	Thread t2 = newStartedThread(new CheckedRunnable() {
325	>	public void realRun() {
326	>	lock.writeLock().lock();
327	>	lock.writeLock().unlock();
328	>	}});
329	>
330	>	Thread.sleep(SHORT_DELAY_MS);
331	>	lock.readLock().unlock();
332	>	awaitTermination(t1, LONG_DELAY_MS);
333	>	awaitTermination(t2, LONG_DELAY_MS);
334	>	}
335	>
336	>	/**
337	>	* Readlocks succeed after a writing thread unlocks
338	>	*/
339	>	public void testReadAfterWriteLock() throws InterruptedException {
340	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
341	>	lock.writeLock().lock();
342	>	Thread t1 = newStartedThread(new CheckedRunnable() {
343	>	public void realRun() {
344	>	lock.readLock().lock();
345	>	lock.readLock().unlock();
346	>	}});
347	>	Thread t2 = newStartedThread(new CheckedRunnable() {
348	>	public void realRun() {
349	>	lock.readLock().lock();
350	>	lock.readLock().unlock();
351	>	}});
352	>
353	>	Thread.sleep(SHORT_DELAY_MS);
354	>	assertTrue(t1.isAlive());
355	>	assertTrue(t2.isAlive());
356	>	releaseWriteLock(lock);
357	>	awaitTermination(t1, LONG_DELAY_MS);
358	>	awaitTermination(t2, LONG_DELAY_MS);
359	>	}
360	>
361	>	/**
362	>	* Read trylock succeeds if write locked by current thread
363	>	*/
364	>	public void testReadHoldingWriteLock() {
365	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
366	>	lock.writeLock().lock();
367	>	assertTrue(lock.readLock().tryLock());
368	>	lock.readLock().unlock();
369	>	lock.writeLock().unlock();
370	>	}
371	>
372	>	/**
373	>	* Read lock succeeds if write locked by current thread even if
374	>	* other threads are waiting for readlock
375	>	*/
376	>	public void testReadHoldingWriteLock2() throws InterruptedException {
377	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
378	>	lock.writeLock().lock();
379	>	Thread t1 = newStartedThread(new CheckedRunnable() {
380	>	public void realRun() {
381	>	lock.readLock().lock();
382	>	lock.readLock().unlock();
383	>	}});
384	>	Thread t2 = newStartedThread(new CheckedRunnable() {
385	>	public void realRun() {
386	>	lock.readLock().lock();
387	>	lock.readLock().unlock();
388	>	}});
389	>
390	>	lock.readLock().lock();
391	>	lock.readLock().unlock();
392	>	Thread.sleep(SHORT_DELAY_MS);
393	>	lock.readLock().lock();
394	>	lock.readLock().unlock();
395	>	lock.writeLock().unlock();
396	>	awaitTermination(t1, LONG_DELAY_MS);
397	>	awaitTermination(t2, LONG_DELAY_MS);
398	>	}
399	>
400	>	/**
401	>	* Read lock succeeds if write locked by current thread even if
402	>	* other threads are waiting for writelock
403	>	*/
404	>	public void testReadHoldingWriteLock3() throws InterruptedException {
405	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
406	>	lock.writeLock().lock();
407	>	Thread t1 = newStartedThread(new CheckedRunnable() {
408	>	public void realRun() {
409	>	lock.writeLock().lock();
410	>	lock.writeLock().unlock();
411	>	}});
412	>	Thread t2 = newStartedThread(new CheckedRunnable() {
413	>	public void realRun() {
414	>	lock.writeLock().lock();
415	>	lock.writeLock().unlock();
416	>	}});
417	>
418	>	lock.readLock().lock();
419	>	lock.readLock().unlock();
420	>	Thread.sleep(SHORT_DELAY_MS);
421	>	lock.readLock().lock();
422	>	lock.readLock().unlock();
423	>	lock.writeLock().unlock();
424	>	awaitTermination(t1, LONG_DELAY_MS);
425	>	awaitTermination(t2, LONG_DELAY_MS);
426	>	}
427	>
428	>
429	>	/**
430	>	* Write lock succeeds if write locked by current thread even if
431	>	* other threads are waiting for writelock
432	>	*/
433	>	public void testWriteHoldingWriteLock4() throws InterruptedException {
434	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
435	>	lock.writeLock().lock();
436	>	Thread t1 = newStartedThread(new CheckedRunnable() {
437	>	public void realRun() {
438	>	lock.writeLock().lock();
439	>	lock.writeLock().unlock();
440	>	}});
441	>	Thread t2 = newStartedThread(new CheckedRunnable() {
442	>	public void realRun() {
443	>	lock.writeLock().lock();
444	>	lock.writeLock().unlock();
445	>	}});
446	>
447	>	lock.writeLock().lock();
448	>	lock.writeLock().unlock();
449	>	Thread.sleep(SHORT_DELAY_MS);
450	>	lock.writeLock().lock();
451	>	lock.writeLock().unlock();
452	>	lock.writeLock().unlock();
453	>	awaitTermination(t1, LONG_DELAY_MS);
454	>	awaitTermination(t2, LONG_DELAY_MS);
455	>	}
456	>
457	>
458	>	/**
459	>	* Fair Read trylock succeeds if write locked by current thread
460	>	*/
461	>	public void testReadHoldingWriteLockFair() {
462	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
463	>	lock.writeLock().lock();
464	>	assertTrue(lock.readLock().tryLock());
465	>	lock.readLock().unlock();
466	>	lock.writeLock().unlock();
467	>	}
468	>
469	>	/**
470	>	* Fair Read lock succeeds if write locked by current thread even if
471	>	* other threads are waiting for readlock
472	>	*/
473	>	public void testReadHoldingWriteLockFair2() throws InterruptedException {
474	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
475	>	lock.writeLock().lock();
476	>	Thread t1 = newStartedThread(new CheckedRunnable() {
477	>	public void realRun() {
478	>	lock.readLock().lock();
479	>	lock.readLock().unlock();
480	>	}});
481	>	Thread t2 = newStartedThread(new CheckedRunnable() {
482	>	public void realRun() {
483	>	lock.readLock().lock();
484	>	lock.readLock().unlock();
485	>	}});
486	>
487	>	lock.readLock().lock();
488	>	lock.readLock().unlock();
489	>	Thread.sleep(SHORT_DELAY_MS);
490	>	lock.readLock().lock();
491	>	lock.readLock().unlock();
492	>	lock.writeLock().unlock();
493	>	awaitTermination(t1, LONG_DELAY_MS);
494	>	awaitTermination(t2, LONG_DELAY_MS);
495	>	}
496	>
497	>
498	>	/**
499	>	* Fair Read lock succeeds if write locked by current thread even if
500	>	* other threads are waiting for writelock
501	>	*/
502	>	public void testReadHoldingWriteLockFair3() throws InterruptedException {
503	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
504	>	lock.writeLock().lock();
505	>	Thread t1 = newStartedThread(new CheckedRunnable() {
506	>	public void realRun() {
507	>	lock.writeLock().lock();
508	>	lock.writeLock().unlock();
509	>	}});
510	>	Thread t2 = newStartedThread(new CheckedRunnable() {
511	>	public void realRun() {
512	>	lock.writeLock().lock();
513	>	lock.writeLock().unlock();
514	>	}});
515	>
516	>	lock.readLock().lock();
517	>	lock.readLock().unlock();
518	>	Thread.sleep(SHORT_DELAY_MS);
519	>	lock.readLock().lock();
520	>	lock.readLock().unlock();
521	>	lock.writeLock().unlock();
522	>	awaitTermination(t1, LONG_DELAY_MS);
523	>	awaitTermination(t2, LONG_DELAY_MS);
524	>	}
525	>
526	>
527	>	/**
528	>	* Fair Write lock succeeds if write locked by current thread even if
529	>	* other threads are waiting for writelock
530	>	*/
531	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
532	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
533	>	lock.writeLock().lock();
534	>	Thread t1 = newStartedThread(new CheckedRunnable() {
535	>	public void realRun() {
536	>	lock.writeLock().lock();
537	>	lock.writeLock().unlock();
538	>	}});
539	>	Thread t2 = newStartedThread(new CheckedRunnable() {
540	>	public void realRun() {
541	>	lock.writeLock().lock();
542	>	lock.writeLock().unlock();
543	>	}});
544	>
545	>	Thread.sleep(SHORT_DELAY_MS);
546	>	assertTrue(lock.isWriteLockedByCurrentThread());
547	>	assertEquals(1, lock.getWriteHoldCount());
548	>	lock.writeLock().lock();
549	>	assertEquals(2, lock.getWriteHoldCount());
550	>	lock.writeLock().unlock();
551	>	lock.writeLock().lock();
552	>	lock.writeLock().unlock();
553	>	lock.writeLock().unlock();
554	>	awaitTermination(t1, LONG_DELAY_MS);
555	>	awaitTermination(t2, LONG_DELAY_MS);
556	>	}
557	>
558	>
559	>	/**
560	>	* Read tryLock succeeds if readlocked but not writelocked
561	>	*/
562	>	public void testTryLockWhenReadLocked() throws InterruptedException {
563	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
564	>	lock.readLock().lock();
565	>	Thread t = newStartedThread(new CheckedRunnable() {
566	>	public void realRun() {
567	>	assertTrue(lock.readLock().tryLock());
568	>	lock.readLock().unlock();
569	>	}});
570	>
571	>	awaitTermination(t, LONG_DELAY_MS);
572	>	lock.readLock().unlock();
573	>	}
574	>
575	>	/**
576	>	* write tryLock fails when readlocked
577	>	*/
578	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
579	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
580	>	lock.readLock().lock();
581	>	Thread t = newStartedThread(new CheckedRunnable() {
582	>	public void realRun() {
583	>	assertFalse(lock.writeLock().tryLock());
584	>	}});
585	>
586	>	awaitTermination(t, LONG_DELAY_MS);
587	>	lock.readLock().unlock();
588	>	}
589	>
590	>
591	>	/**
592	>	* Fair Read tryLock succeeds if readlocked but not writelocked
593	>	*/
594	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
595	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
596	>	lock.readLock().lock();
597	>	Thread t = newStartedThread(new CheckedRunnable() {
598	>	public void realRun() {
599	>	assertTrue(lock.readLock().tryLock());
600	>	lock.readLock().unlock();
601	>	}});
602	>
603	>	awaitTermination(t, LONG_DELAY_MS);
604	>	lock.readLock().unlock();
605	>	}
606	>
607	>
608	>
609	>	/**
610	>	* Fair write tryLock fails when readlocked
611	>	*/
612	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
613	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
614	>	lock.readLock().lock();
615	>	Thread t = newStartedThread(new CheckedRunnable() {
616	>	public void realRun() {
617	>	assertFalse(lock.writeLock().tryLock());
618	>	}});
619	>
620	>	awaitTermination(t, LONG_DELAY_MS);
621	>	lock.readLock().unlock();
622	>	}
623	>
624	>
625	>
626	>	/**
627	>	* write timed tryLock times out if locked
628	>	*/
629	>	public void testWriteTryLock_Timeout() throws InterruptedException {
630	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
631	>	lock.writeLock().lock();
632	>	Thread t = newStartedThread(new CheckedRunnable() {
633	>	public void realRun() throws InterruptedException {
634	>	assertFalse(lock.writeLock().tryLock(1, MILLISECONDS));
635	>	}});
636	>
637	>	awaitTermination(t, LONG_DELAY_MS);
638	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
639	>	lock.writeLock().unlock();
640	>	}
641	>
642	>	/**
643	>	* read timed tryLock times out if write-locked
644	>	*/
645	>	public void testReadTryLock_Timeout() throws InterruptedException {
646	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
647	>	lock.writeLock().lock();
648	>	Thread t = newStartedThread(new CheckedRunnable() {
649	>	public void realRun() throws InterruptedException {
650	>	assertFalse(lock.readLock().tryLock(1, MILLISECONDS));
651	>	}});
652	>
653	>	awaitTermination(t, LONG_DELAY_MS);
654	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
655	>	lock.writeLock().unlock();
656	>	}
657	>
658	>
659	>	/**
660	>	* write lockInterruptibly succeeds if lock free else is interruptible
661	>	*/
662	>	public void testWriteLockInterruptibly() throws InterruptedException {
663	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
664	>	lock.writeLock().lockInterruptibly();
665	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
666	>	public void realRun() throws InterruptedException {
667	>	lock.writeLock().lockInterruptibly();
668	>	}});
669	>
670	>	Thread.sleep(SHORT_DELAY_MS);
671	>	t.interrupt();
672	>	awaitTermination(t, LONG_DELAY_MS);
673	>	releaseWriteLock(lock);
674	>	}
675	>
676	>	/**
677	>	* read lockInterruptibly succeeds if lock free else is interruptible
678	>	*/
679	>	public void testReadLockInterruptibly() throws InterruptedException {
680	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
681	>	lock.writeLock().lockInterruptibly();
682	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
683	>	public void realRun() throws InterruptedException {
684	>	lock.readLock().lockInterruptibly();
685	>	}});
686	>
687	>	Thread.sleep(SHORT_DELAY_MS);
688	>	t.interrupt();
689	>	awaitTermination(t, LONG_DELAY_MS);
690	>	releaseWriteLock(lock);
691		}
692
693	<	public void testAwait_IllegalMonitor() {
694	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
693	>	/**
694	>	* Calling await without holding lock throws IllegalMonitorStateException
695	>	*/
696	>	public void testAwait_IllegalMonitor() throws InterruptedException {
697	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
698		final Condition c = lock.writeLock().newCondition();
699		try {
700		c.await();
701	<	fail("should throw");
702	<	}
387	<	catch (IllegalMonitorStateException success) {
388	<	}
389	<	catch (Exception ex) {
390	<	fail("should throw IMSE");
391	<	}
701	>	shouldThrow();
702	>	} catch (IllegalMonitorStateException success) {}
703		}
704
705	+	/**
706	+	* Calling signal without holding lock throws IllegalMonitorStateException
707	+	*/
708		public void testSignal_IllegalMonitor() {
709	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
709	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
710		final Condition c = lock.writeLock().newCondition();
711		try {
712		c.signal();
713	<	fail("should throw");
714	<	}
401	<	catch (IllegalMonitorStateException success) {
402	<	}
403	<	catch (Exception ex) {
404	<	fail("should throw IMSE");
405	<	}
713	>	shouldThrow();
714	>	} catch (IllegalMonitorStateException success) {}
715		}
716
717	<	public void testAwaitNanos_Timeout() {
718	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
717	>	/**
718	>	* awaitNanos without a signal times out
719	>	*/
720	>	public void testAwaitNanos_Timeout() throws InterruptedException {
721	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
722		final Condition c = lock.writeLock().newCondition();
723	<	try {
724	<	lock.writeLock().lock();
725	<	long t = c.awaitNanos(100);
726	<	assertTrue(t <= 0);
727	<	lock.writeLock().unlock();
416	<	}
417	<	catch (Exception ex) {
418	<	fail("unexpected exception");
419	<	}
723	>
724	>	lock.writeLock().lock();
725	>	long t = c.awaitNanos(100);
726	>	assertTrue(t <= 0);
727	>	lock.writeLock().unlock();
728		}
729
730	<	public void testAwait_Timeout() {
731	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
730	>
731	>	/**
732	>	* timed await without a signal times out
733	>	*/
734	>	public void testAwait_Timeout() throws InterruptedException {
735	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
736		final Condition c = lock.writeLock().newCondition();
737	<	try {
738	<	lock.writeLock().lock();
739	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
428	<	lock.writeLock().unlock();
429	<	}
430	<	catch (Exception ex) {
431	<	fail("unexpected exception");
432	<	}
737	>	lock.writeLock().lock();
738	>	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
739	>	lock.writeLock().unlock();
740		}
741
742	<	public void testAwaitUntil_Timeout() {
743	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
742	>	/**
743	>	* awaitUntil without a signal times out
744	>	*/
745	>	public void testAwaitUntil_Timeout() throws InterruptedException {
746	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
747		final Condition c = lock.writeLock().newCondition();
748	<	try {
749	<	lock.writeLock().lock();
750	<	java.util.Date d = new java.util.Date();
751	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
442	<	lock.writeLock().unlock();
443	<	}
444	<	catch (Exception ex) {
445	<	fail("unexpected exception");
446	<	}
748	>	lock.writeLock().lock();
749	>	java.util.Date d = new java.util.Date();
750	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
751	>	lock.writeLock().unlock();
752		}
753
754	<	public void testAwait() {
755	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
754	>	/**
755	>	* await returns when signalled
756	>	*/
757	>	public void testAwait() throws InterruptedException {
758	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
759		final Condition c = lock.writeLock().newCondition();
760	<	Thread t = new Thread(new Runnable() {
761	<	public void run() {
762	<	try {
763	<	lock.writeLock().lock();
764	<	c.await();
765	<	lock.writeLock().unlock();
766	<	}
767	<	catch(InterruptedException e) {
768	<	fail("unexpected exception");
769	<	}
770	<	}
771	<	});
760	>	Thread t = newStartedThread(new CheckedRunnable() {
761	>	public void realRun() throws InterruptedException {
762	>	lock.writeLock().lock();
763	>	c.await();
764	>	lock.writeLock().unlock();
765	>	}});
766	>
767	>	Thread.sleep(SHORT_DELAY_MS);
768	>	lock.writeLock().lock();
769	>	c.signal();
770	>	lock.writeLock().unlock();
771	>	awaitTermination(t, LONG_DELAY_MS);
772	>	}
773
774	<	try {
775	<	t.start();
776	<	Thread.sleep(SHORT_DELAY_MS);
777	<	lock.writeLock().lock();
778	<	c.signal();
779	<	lock.writeLock().unlock();
780	<	t.join(SHORT_DELAY_MS);
781	<	assertFalse(t.isAlive());
782	<	}
783	<	catch (Exception ex) {
784	<	fail("unexpected exception");
774	>	/** A helper class for uninterruptible wait tests */
775	>	class UninterruptableThread extends Thread {
776	>	private Lock lock;
777	>	private Condition c;
778	>
779	>	public volatile boolean canAwake = false;
780	>	public volatile boolean interrupted = false;
781	>	public volatile boolean lockStarted = false;
782	>
783	>	public UninterruptableThread(Lock lock, Condition c) {
784	>	this.lock = lock;
785	>	this.c = c;
786	>	}
787	>
788	>	public synchronized void run() {
789	>	lock.lock();
790	>	lockStarted = true;
791	>
792	>	while (!canAwake) {
793	>	c.awaitUninterruptibly();
794	>	}
795	>
796	>	interrupted = isInterrupted();
797	>	lock.unlock();
798		}
799		}
800
801	<	public void testAwaitUninterruptibly() {
802	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
801	>	/**
802	>	* awaitUninterruptibly doesn't abort on interrupt
803	>	*/
804	>	public void testAwaitUninterruptibly() throws InterruptedException {
805	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
806		final Condition c = lock.writeLock().newCondition();
807	<	Thread t = new Thread(new Runnable() {
808	<	public void run() {
809	<	lock.writeLock().lock();
485	<	c.awaitUninterruptibly();
486	<	lock.writeLock().unlock();
487	<	}
488	<	});
807	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
808	>
809	>	thread.start();
810
811	+	while (!thread.lockStarted) {
812	+	Thread.sleep(100);
813	+	}
814	+
815	+	lock.writeLock().lock();
816		try {
817	<	t.start();
818	<	Thread.sleep(SHORT_DELAY_MS);
493	<	t.interrupt();
494	<	lock.writeLock().lock();
817	>	thread.interrupt();
818	>	thread.canAwake = true;
819		c.signal();
820	+	} finally {
821		lock.writeLock().unlock();
497	–	t.join(SHORT_DELAY_MS);
498	–	assertFalse(t.isAlive());
499	–	}
500	–	catch (Exception ex) {
501	–	fail("unexpected exception");
822		}
823	+
824	+	awaitTermination(thread, LONG_DELAY_MS);
825	+	assertTrue(thread.interrupted);
826		}
827
828	<	public void testAwait_Interrupt() {
829	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
830	<	final Condition c = lock.writeLock().newCondition();
831	<	Thread t = new Thread(new Runnable() {
832	<	public void run() {
833	<	try {
834	<	lock.writeLock().lock();
835	<	c.await();
836	<	lock.writeLock().unlock();
837	<	fail("should throw");
838	<	}
839	<	catch(InterruptedException success) {
840	<	}
841	<	}
842	<	});
843	<
844	<	try {
845	<	t.start();
846	<	Thread.sleep(SHORT_DELAY_MS);
847	<	t.interrupt();
848	<	t.join(SHORT_DELAY_MS);
849	<	assertFalse(t.isAlive());
527	<	}
528	<	catch (Exception ex) {
529	<	fail("unexpected exception");
530	<	}
531	<	}
532	<
533	<	public void testAwaitNanos_Interrupt() {
534	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
535	<	final Condition c = lock.writeLock().newCondition();
536	<	Thread t = new Thread(new Runnable() {
537	<	public void run() {
538	<	try {
539	<	lock.writeLock().lock();
540	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
541	<	lock.writeLock().unlock();
542	<	fail("should throw");
543	<	}
544	<	catch(InterruptedException success) {
545	<	}
546	<	}
547	<	});
548	<
549	<	try {
550	<	t.start();
551	<	Thread.sleep(SHORT_DELAY_MS);
552	<	t.interrupt();
553	<	t.join(SHORT_DELAY_MS);
554	<	assertFalse(t.isAlive());
555	<	}
556	<	catch (Exception ex) {
557	<	fail("unexpected exception");
558	<	}
559	<	}
560	<
561	<	public void testAwaitUntil_Interrupt() {
562	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
563	<	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	<	}
828	>	/**
829	>	* await is interruptible
830	>	*/
831	>	public void testAwait_Interrupt() throws InterruptedException {
832	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
833	>	final Condition c = lock.writeLock().newCondition();
834	>	final CountDownLatch locked = new CountDownLatch(1);
835	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
836	>	public void realRun() throws InterruptedException {
837	>	lock.writeLock().lock();
838	>	assertTrue(lock.isWriteLocked());
839	>	locked.countDown();
840	>	try { c.await(); }
841	>	finally { lock.writeLock().unlock(); }
842	>	}});
843	>
844	>	locked.await();
845	>	while (lock.isWriteLocked())
846	>	Thread.yield();
847	>	t.interrupt();
848	>	awaitTermination(t, LONG_DELAY_MS);
849	>	assertFalse(lock.isWriteLocked());
850		}
851
852	<	public void testSerialization() {
852	>	/**
853	>	* awaitNanos is interruptible
854	>	*/
855	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
856	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
857	>	final Condition c = lock.writeLock().newCondition();
858	>	final CountDownLatch locked = new CountDownLatch(1);
859	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
860	>	public void realRun() throws InterruptedException {
861	>	lock.writeLock().lock();
862	>	assertTrue(lock.isWriteLocked());
863	>	locked.countDown();
864	>	try { c.awaitNanos(MILLISECONDS.toNanos(LONG_DELAY_MS)); }
865	>	finally { lock.writeLock().unlock(); }
866	>	}});
867	>
868	>	locked.await();
869	>	while (lock.isWriteLocked())
870	>	Thread.yield();
871	>	t.interrupt();
872	>	awaitTermination(t, LONG_DELAY_MS);
873	>	assertFalse(lock.isWriteLocked());
874	>	}
875	>
876	>	/**
877	>	* awaitUntil is interruptible
878	>	*/
879	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
880	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
881	>	final Condition c = lock.writeLock().newCondition();
882	>	final CountDownLatch locked = new CountDownLatch(1);
883	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
884	>	public void realRun() throws InterruptedException {
885	>	lock.writeLock().lock();
886	>	assertTrue(lock.isWriteLocked());
887	>	locked.countDown();
888	>	java.util.Date d = new java.util.Date();
889	>	try { c.awaitUntil(new java.util.Date(d.getTime() + 10000)); }
890	>	finally { lock.writeLock().unlock(); }
891	>	}});
892	>
893	>	locked.await();
894	>	while (lock.isWriteLocked())
895	>	Thread.yield();
896	>	t.interrupt();
897	>	awaitTermination(t, LONG_DELAY_MS);
898	>	assertFalse(lock.isWriteLocked());
899	>	}
900	>
901	>	/**
902	>	* signalAll wakes up all threads
903	>	*/
904	>	public void testSignalAll() throws InterruptedException {
905	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
906	>	final Condition c = lock.writeLock().newCondition();
907	>	Thread t1 = newStartedThread(new CheckedRunnable() {
908	>	public void realRun() throws InterruptedException {
909	>	lock.writeLock().lock();
910	>	c.await();
911	>	lock.writeLock().unlock();
912	>	}});
913	>
914	>	Thread t2 = newStartedThread(new CheckedRunnable() {
915	>	public void realRun() throws InterruptedException {
916	>	lock.writeLock().lock();
917	>	c.await();
918	>	lock.writeLock().unlock();
919	>	}});
920	>
921	>	Thread.sleep(SHORT_DELAY_MS);
922	>	lock.writeLock().lock();
923	>	c.signalAll();
924	>	lock.writeLock().unlock();
925	>	awaitTermination(t1, LONG_DELAY_MS);
926	>	awaitTermination(t2, LONG_DELAY_MS);
927	>	}
928	>
929	>	/**
930	>	* A serialized lock deserializes as unlocked
931	>	*/
932	>	public void testSerialization() throws Exception {
933		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
934		l.readLock().lock();
935		l.readLock().unlock();
936
937	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
938	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
939	+	out.writeObject(l);
940	+	out.close();
941	+
942	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
943	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
944	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
945	+	r.readLock().lock();
946	+	r.readLock().unlock();
947	+	}
948	+
949	+	/**
950	+	* hasQueuedThreads reports whether there are waiting threads
951	+	*/
952	+	public void testhasQueuedThreads() throws InterruptedException {
953	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
954	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
955	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
956	+	assertFalse(lock.hasQueuedThreads());
957	+	lock.writeLock().lock();
958	+	t1.start();
959	+	Thread.sleep(SHORT_DELAY_MS);
960	+	assertTrue(lock.hasQueuedThreads());
961	+	t2.start();
962	+	Thread.sleep(SHORT_DELAY_MS);
963	+	assertTrue(lock.hasQueuedThreads());
964	+	t1.interrupt();
965	+	Thread.sleep(SHORT_DELAY_MS);
966	+	assertTrue(lock.hasQueuedThreads());
967	+	lock.writeLock().unlock();
968	+	Thread.sleep(SHORT_DELAY_MS);
969	+	assertFalse(lock.hasQueuedThreads());
970	+	awaitTermination(t1, LONG_DELAY_MS);
971	+	awaitTermination(t2, LONG_DELAY_MS);
972	+	}
973	+
974	+	/**
975	+	* hasQueuedThread(null) throws NPE
976	+	*/
977	+	public void testHasQueuedThreadNPE() {
978	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
979		try {
980	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
981	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
982	<	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	<	}
980	>	sync.hasQueuedThread(null);
981	>	shouldThrow();
982	>	} catch (NullPointerException success) {}
983		}
984
985	+	/**
986	+	* hasQueuedThread reports whether a thread is queued.
987	+	*/
988	+	public void testHasQueuedThread() throws InterruptedException {
989	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
990	+	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
991	+	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
992	+	assertFalse(sync.hasQueuedThread(t1));
993	+	assertFalse(sync.hasQueuedThread(t2));
994	+	sync.writeLock().lock();
995	+	t1.start();
996	+	Thread.sleep(SHORT_DELAY_MS);
997	+	assertTrue(sync.hasQueuedThread(t1));
998	+	t2.start();
999	+	Thread.sleep(SHORT_DELAY_MS);
1000	+	assertTrue(sync.hasQueuedThread(t1));
1001	+	assertTrue(sync.hasQueuedThread(t2));
1002	+	t1.interrupt();
1003	+	Thread.sleep(SHORT_DELAY_MS);
1004	+	assertFalse(sync.hasQueuedThread(t1));
1005	+	assertTrue(sync.hasQueuedThread(t2));
1006	+	sync.writeLock().unlock();
1007	+	Thread.sleep(SHORT_DELAY_MS);
1008	+	assertFalse(sync.hasQueuedThread(t1));
1009	+	Thread.sleep(SHORT_DELAY_MS);
1010	+	assertFalse(sync.hasQueuedThread(t2));
1011	+	awaitTermination(t1, LONG_DELAY_MS);
1012	+	awaitTermination(t2, LONG_DELAY_MS);
1013	+	}
1014	+
1015	+
1016	+	/**
1017	+	* getQueueLength reports number of waiting threads
1018	+	*/
1019	+	public void testGetQueueLength() throws InterruptedException {
1020	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1021	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1022	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1023	+	assertEquals(0, lock.getQueueLength());
1024	+	lock.writeLock().lock();
1025	+	t1.start();
1026	+	Thread.sleep(SHORT_DELAY_MS);
1027	+	assertEquals(1, lock.getQueueLength());
1028	+	t2.start();
1029	+	Thread.sleep(SHORT_DELAY_MS);
1030	+	assertEquals(2, lock.getQueueLength());
1031	+	t1.interrupt();
1032	+	Thread.sleep(SHORT_DELAY_MS);
1033	+	assertEquals(1, lock.getQueueLength());
1034	+	lock.writeLock().unlock();
1035	+	Thread.sleep(SHORT_DELAY_MS);
1036	+	assertEquals(0, lock.getQueueLength());
1037	+	awaitTermination(t1, LONG_DELAY_MS);
1038	+	awaitTermination(t2, LONG_DELAY_MS);
1039	+	}
1040	+
1041	+	/**
1042	+	* getQueuedThreads includes waiting threads
1043	+	*/
1044	+	public void testGetQueuedThreads() throws InterruptedException {
1045	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1046	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1047	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1048	+	assertTrue(lock.getQueuedThreads().isEmpty());
1049	+	lock.writeLock().lock();
1050	+	assertTrue(lock.getQueuedThreads().isEmpty());
1051	+	t1.start();
1052	+	Thread.sleep(SHORT_DELAY_MS);
1053	+	assertTrue(lock.getQueuedThreads().contains(t1));
1054	+	t2.start();
1055	+	Thread.sleep(SHORT_DELAY_MS);
1056	+	assertTrue(lock.getQueuedThreads().contains(t1));
1057	+	assertTrue(lock.getQueuedThreads().contains(t2));
1058	+	t1.interrupt();
1059	+	Thread.sleep(SHORT_DELAY_MS);
1060	+	assertFalse(lock.getQueuedThreads().contains(t1));
1061	+	assertTrue(lock.getQueuedThreads().contains(t2));
1062	+	lock.writeLock().unlock();
1063	+	Thread.sleep(SHORT_DELAY_MS);
1064	+	assertTrue(lock.getQueuedThreads().isEmpty());
1065	+	awaitTermination(t1, LONG_DELAY_MS);
1066	+	awaitTermination(t2, LONG_DELAY_MS);
1067	+	}
1068	+
1069	+	/**
1070	+	* hasWaiters throws NPE if null
1071	+	*/
1072	+	public void testHasWaitersNPE() {
1073	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1074	+	try {
1075	+	lock.hasWaiters(null);
1076	+	shouldThrow();
1077	+	} catch (NullPointerException success) {}
1078	+	}
1079	+
1080	+	/**
1081	+	* getWaitQueueLength throws NPE if null
1082	+	*/
1083	+	public void testGetWaitQueueLengthNPE() {
1084	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1085	+	try {
1086	+	lock.getWaitQueueLength(null);
1087	+	shouldThrow();
1088	+	} catch (NullPointerException success) {}
1089	+	}
1090	+
1091	+
1092	+	/**
1093	+	* getWaitingThreads throws NPE if null
1094	+	*/
1095	+	public void testGetWaitingThreadsNPE() {
1096	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1097	+	try {
1098	+	lock.getWaitingThreads(null);
1099	+	shouldThrow();
1100	+	} catch (NullPointerException success) {}
1101	+	}
1102	+
1103	+	/**
1104	+	* hasWaiters throws IAE if not owned
1105	+	*/
1106	+	public void testHasWaitersIAE() {
1107	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1108	+	final Condition c = lock.writeLock().newCondition();
1109	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1110	+	try {
1111	+	lock2.hasWaiters(c);
1112	+	shouldThrow();
1113	+	} catch (IllegalArgumentException success) {}
1114	+	}
1115	+
1116	+	/**
1117	+	* hasWaiters throws IMSE if not locked
1118	+	*/
1119	+	public void testHasWaitersIMSE() {
1120	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1121	+	final Condition c = lock.writeLock().newCondition();
1122	+	try {
1123	+	lock.hasWaiters(c);
1124	+	shouldThrow();
1125	+	} catch (IllegalMonitorStateException success) {}
1126	+	}
1127	+
1128	+
1129	+	/**
1130	+	* getWaitQueueLength throws IAE if not owned
1131	+	*/
1132	+	public void testGetWaitQueueLengthIAE() {
1133	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1134	+	final Condition c = lock.writeLock().newCondition();
1135	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1136	+	try {
1137	+	lock2.getWaitQueueLength(c);
1138	+	shouldThrow();
1139	+	} catch (IllegalArgumentException success) {}
1140	+	}
1141	+
1142	+	/**
1143	+	* getWaitQueueLength throws IMSE if not locked
1144	+	*/
1145	+	public void testGetWaitQueueLengthIMSE() {
1146	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1147	+	final Condition c = lock.writeLock().newCondition();
1148	+	try {
1149	+	lock.getWaitQueueLength(c);
1150	+	shouldThrow();
1151	+	} catch (IllegalMonitorStateException success) {}
1152	+	}
1153	+
1154	+
1155	+	/**
1156	+	* getWaitingThreads throws IAE if not owned
1157	+	*/
1158	+	public void testGetWaitingThreadsIAE() {
1159	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1160	+	final Condition c = lock.writeLock().newCondition();
1161	+	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1162	+	try {
1163	+	lock2.getWaitingThreads(c);
1164	+	shouldThrow();
1165	+	} catch (IllegalArgumentException success) {}
1166	+	}
1167	+
1168	+	/**
1169	+	* getWaitingThreads throws IMSE if not locked
1170	+	*/
1171	+	public void testGetWaitingThreadsIMSE() {
1172	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1173	+	final Condition c = lock.writeLock().newCondition();
1174	+	try {
1175	+	lock.getWaitingThreads(c);
1176	+	shouldThrow();
1177	+	} catch (IllegalMonitorStateException success) {}
1178	+	}
1179	+
1180	+
1181	+	/**
1182	+	* hasWaiters returns true when a thread is waiting, else false
1183	+	*/
1184	+	public void testHasWaiters() throws InterruptedException {
1185	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1186	+	final Condition c = lock.writeLock().newCondition();
1187	+	Thread t = newStartedThread(new CheckedRunnable() {
1188	+	public void realRun() throws InterruptedException {
1189	+	lock.writeLock().lock();
1190	+	assertFalse(lock.hasWaiters(c));
1191	+	assertEquals(0, lock.getWaitQueueLength(c));
1192	+	c.await();
1193	+	lock.writeLock().unlock();
1194	+	}});
1195	+
1196	+	Thread.sleep(SHORT_DELAY_MS);
1197	+	lock.writeLock().lock();
1198	+	assertTrue(lock.hasWaiters(c));
1199	+	assertEquals(1, lock.getWaitQueueLength(c));
1200	+	c.signal();
1201	+	lock.writeLock().unlock();
1202	+	Thread.sleep(SHORT_DELAY_MS);
1203	+	lock.writeLock().lock();
1204	+	assertFalse(lock.hasWaiters(c));
1205	+	assertEquals(0, lock.getWaitQueueLength(c));
1206	+	lock.writeLock().unlock();
1207	+	awaitTermination(t, LONG_DELAY_MS);
1208	+	}
1209	+
1210	+	/**
1211	+	* getWaitQueueLength returns number of waiting threads
1212	+	*/
1213	+	public void testGetWaitQueueLength() throws InterruptedException {
1214	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1215	+	final Condition c = lock.writeLock().newCondition();
1216	+	Thread t = newStartedThread(new CheckedRunnable() {
1217	+	public void realRun() throws InterruptedException {
1218	+	lock.writeLock().lock();
1219	+	assertFalse(lock.hasWaiters(c));
1220	+	assertEquals(0, lock.getWaitQueueLength(c));
1221	+	c.await();
1222	+	lock.writeLock().unlock();
1223	+	}});
1224	+
1225	+	Thread.sleep(SHORT_DELAY_MS);
1226	+	lock.writeLock().lock();
1227	+	assertTrue(lock.hasWaiters(c));
1228	+	assertEquals(1, lock.getWaitQueueLength(c));
1229	+	c.signal();
1230	+	lock.writeLock().unlock();
1231	+	Thread.sleep(SHORT_DELAY_MS);
1232	+	lock.writeLock().lock();
1233	+	assertFalse(lock.hasWaiters(c));
1234	+	assertEquals(0, lock.getWaitQueueLength(c));
1235	+	lock.writeLock().unlock();
1236	+	awaitTermination(t, LONG_DELAY_MS);
1237	+	}
1238	+
1239	+
1240	+	/**
1241	+	* getWaitingThreads returns only and all waiting threads
1242	+	*/
1243	+	public void testGetWaitingThreads() throws InterruptedException {
1244	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1245	+	final Condition c = lock.writeLock().newCondition();
1246	+	Thread t1 = new Thread(new CheckedRunnable() {
1247	+	public void realRun() throws InterruptedException {
1248	+	lock.writeLock().lock();
1249	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1250	+	c.await();
1251	+	lock.writeLock().unlock();
1252	+	}});
1253	+
1254	+	Thread t2 = new Thread(new CheckedRunnable() {
1255	+	public void realRun() throws InterruptedException {
1256	+	lock.writeLock().lock();
1257	+	assertFalse(lock.getWaitingThreads(c).isEmpty());
1258	+	c.await();
1259	+	lock.writeLock().unlock();
1260	+	}});
1261	+
1262	+	lock.writeLock().lock();
1263	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1264	+	lock.writeLock().unlock();
1265	+	t1.start();
1266	+	Thread.sleep(SHORT_DELAY_MS);
1267	+	t2.start();
1268	+	Thread.sleep(SHORT_DELAY_MS);
1269	+	lock.writeLock().lock();
1270	+	assertTrue(lock.hasWaiters(c));
1271	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1272	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1273	+	c.signalAll();
1274	+	lock.writeLock().unlock();
1275	+	Thread.sleep(SHORT_DELAY_MS);
1276	+	lock.writeLock().lock();
1277	+	assertFalse(lock.hasWaiters(c));
1278	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1279	+	lock.writeLock().unlock();
1280	+	awaitTermination(t1, LONG_DELAY_MS);
1281	+	awaitTermination(t2, LONG_DELAY_MS);
1282	+	}
1283	+
1284	+	/**
1285	+	* toString indicates current lock state
1286	+	*/
1287	+	public void testToString() {
1288	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1289	+	String us = lock.toString();
1290	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1291	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1292	+	lock.writeLock().lock();
1293	+	String ws = lock.toString();
1294	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1295	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1296	+	lock.writeLock().unlock();
1297	+	lock.readLock().lock();
1298	+	lock.readLock().lock();
1299	+	String rs = lock.toString();
1300	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1301	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1302	+	}
1303	+
1304	+	/**
1305	+	* readLock.toString indicates current lock state
1306	+	*/
1307	+	public void testReadLockToString() {
1308	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1309	+	String us = lock.readLock().toString();
1310	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1311	+	lock.readLock().lock();
1312	+	lock.readLock().lock();
1313	+	String rs = lock.readLock().toString();
1314	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1315	+	}
1316	+
1317	+	/**
1318	+	* writeLock.toString indicates current lock state
1319	+	*/
1320	+	public void testWriteLockToString() {
1321	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1322	+	String us = lock.writeLock().toString();
1323	+	assertTrue(us.indexOf("Unlocked") >= 0);
1324	+	lock.writeLock().lock();
1325	+	String ls = lock.writeLock().toString();
1326	+	assertTrue(ls.indexOf("Locked") >= 0);
1327	+	}
1328
1329		}

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