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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.3 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.53 by jsr166, Mon May 2 00:49:26 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 JSR166TestCase {
17		public static void main(String[] args) {
18	<	junit.textui.TestRunner.run (suite());
18	>	junit.textui.TestRunner.run(suite());
19		}
20		public static Test suite() {
21	<	return new TestSuite(ReentrantReadWriteLockTest.class);
21	>	return new TestSuite(ReentrantReadWriteLockTest.class);
22	>	}
23	>
24	>	/**
25	>	* A runnable calling lockInterruptibly
26	>	*/
27	>	class InterruptibleLockRunnable extends CheckedRunnable {
28	>	final ReentrantReadWriteLock lock;
29	>	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
30	>	public void realRun() throws InterruptedException {
31	>	lock.writeLock().lockInterruptibly();
32	>	}
33		}
34
21	–	static int HOLD_COUNT_TEST_LIMIT = 20;
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	<	public void testIllegalMonitorStateException(){
41	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
42	<	try{
43	<	rl.writeLock().unlock();
44	<	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 lock, checking that it had a hold count of 1.
63	+	*/
64	+	void releaseLock(ReentrantReadWriteLock.WriteLock lock) {
65	+	assertTrue(lock.isHeldByCurrentThread());
66	+	lock.unlock();
67	+	assertFalse(lock.isHeldByCurrentThread());
68	+	}
69
70	+	/**
71	+	* Constructor sets given fairness, and is in unlocked state
72	+	*/
73	+	public void testConstructor() {
74	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
75	+	assertFalse(rl.isFair());
76	+	assertFalse(rl.isWriteLocked());
77	+	assertEquals(0, rl.getReadLockCount());
78	+	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
79	+	assertTrue(r2.isFair());
80	+	assertFalse(r2.isWriteLocked());
81	+	assertEquals(0, r2.getReadLockCount());
82	+	ReentrantReadWriteLock r3 = new ReentrantReadWriteLock(false);
83	+	assertFalse(r3.isFair());
84	+	assertFalse(r3.isWriteLocked());
85	+	assertEquals(0, r3.getReadLockCount());
86	+	}
87
88	<	public void testInterruptedException(){
89	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
90	<	lock.writeLock().lock();
91	<	Thread t = new Thread(new Runnable() {
92	<	public void run(){
93	<	try{
94	<	lock.writeLock().lockInterruptibly();
95	<	threadFail("should throw");
96	<	}catch(InterruptedException success){}
97	<	}
98	<	});
99	<	try {
100	<	t.start();
101	<	t.interrupt();
102	<	lock.writeLock().unlock();
103	<	t.join();
104	<	} catch(Exception e){
105	<	fail("unexpected exception");
106	<	}
107	<	}
108	<
109	<	public void testInterruptedException2(){
110	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
61	<	lock.writeLock().lock();
62	<	Thread t = new Thread(new Runnable() {
63	<	public void run(){
64	<	try{
65	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
66	<	threadFail("should throw");
67	<	}catch(InterruptedException success){}
68	<	}
69	<	});
70	<	try {
71	<	t.start();
72	<	t.interrupt();
73	<	lock.writeLock().unlock();
74	<	t.join();
75	<	} catch(Exception e){
76	<	fail("unexpected exception");
77	<	}
88	>	/**
89	>	* write-locking and read-locking an unlocked lock succeed
90	>	*/
91	>	public void testLock() {
92	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
93	>	rl.writeLock().lock();
94	>	assertTrue(rl.isWriteLocked());
95	>	assertTrue(rl.isWriteLockedByCurrentThread());
96	>	assertTrue(rl.writeLock().isHeldByCurrentThread());
97	>	assertEquals(0, rl.getReadLockCount());
98	>	rl.writeLock().unlock();
99	>	assertFalse(rl.isWriteLocked());
100	>	assertFalse(rl.isWriteLockedByCurrentThread());
101	>	assertFalse(rl.writeLock().isHeldByCurrentThread());
102	>	assertEquals(0, rl.getReadLockCount());
103	>	rl.readLock().lock();
104	>	assertFalse(rl.isWriteLocked());
105	>	assertFalse(rl.isWriteLockedByCurrentThread());
106	>	assertEquals(1, rl.getReadLockCount());
107	>	rl.readLock().unlock();
108	>	assertFalse(rl.isWriteLocked());
109	>	assertFalse(rl.isWriteLockedByCurrentThread());
110	>	assertEquals(0, rl.getReadLockCount());
111		}
112
113	<	public void testInterruptedException3(){
114	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
115	<	lock.writeLock().lock();
116	<	Thread t = new Thread(new Runnable() {
117	<	public void run(){
118	<	try{
119	<	lock.readLock().lockInterruptibly();
120	<	threadFail("should throw");
121	<	}catch(InterruptedException success){}
122	<	}
123	<	});
124	<	try {
125	<	t.start();
126	<	t.interrupt();
127	<	lock.writeLock().unlock();
128	<	t.join();
129	<	} catch(Exception e){
130	<	fail("unexpected exception");
131	<	}
132	<	}
133	<
134	<	public void testInterruptedException4(){
135	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
136	<	lock.writeLock().lock();
104	<	Thread t = new Thread(new Runnable() {
105	<	public void run(){
106	<	try{
107	<	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
108	<	threadFail("should throw");
109	<	}catch(InterruptedException success){}
110	<	}
111	<	});
112	<	try {
113	<	t.start();
114	<	t.interrupt();
115	<	t.join();
116	<	} catch(Exception e){
117	<	fail("unexpected exception");
118	<	}
113	>
114	>	/**
115	>	* locking an unlocked fair lock succeeds
116	>	*/
117	>	public void testFairLock() {
118	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
119	>	rl.writeLock().lock();
120	>	assertTrue(rl.isWriteLocked());
121	>	assertTrue(rl.isWriteLockedByCurrentThread());
122	>	assertTrue(rl.writeLock().isHeldByCurrentThread());
123	>	assertEquals(0, rl.getReadLockCount());
124	>	rl.writeLock().unlock();
125	>	assertFalse(rl.isWriteLocked());
126	>	assertFalse(rl.isWriteLockedByCurrentThread());
127	>	assertFalse(rl.writeLock().isHeldByCurrentThread());
128	>	assertEquals(0, rl.getReadLockCount());
129	>	rl.readLock().lock();
130	>	assertFalse(rl.isWriteLocked());
131	>	assertFalse(rl.isWriteLockedByCurrentThread());
132	>	assertEquals(1, rl.getReadLockCount());
133	>	rl.readLock().unlock();
134	>	assertFalse(rl.isWriteLocked());
135	>	assertFalse(rl.isWriteLockedByCurrentThread());
136	>	assertEquals(0, rl.getReadLockCount());
137		}
138
139	<
140	<	public void testTryLockWhenLocked() {
141	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
142	<	lock.writeLock().lock();
143	<	Thread t = new Thread(new Runnable() {
144	<	public void run(){
145	<	threadAssertFalse(lock.writeLock().tryLock());
146	<	}
147	<	});
148	<	try {
131	<	t.start();
132	<	t.join();
139	>	/**
140	>	* getWriteHoldCount returns number of recursive holds
141	>	*/
142	>	public void testGetWriteHoldCount() {
143	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
144	>	for (int i = 1; i <= SIZE; i++) {
145	>	lock.writeLock().lock();
146	>	assertEquals(i,lock.getWriteHoldCount());
147	>	}
148	>	for (int i = SIZE; i > 0; i--) {
149		lock.writeLock().unlock();
150	<	} catch(Exception e){
135	<	fail("unexpected exception");
150	>	assertEquals(i-1,lock.getWriteHoldCount());
151		}
152	<	}
152	>	}
153
154	<	public void testTryLockWhenLocked2() {
155	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
156	<	lock.writeLock().lock();
157	<	Thread t = new Thread(new Runnable() {
158	<	public void run(){
159	<	threadAssertFalse(lock.readLock().tryLock());
160	<	}
161	<	});
162	<	try {
163	<	t.start();
149	<	t.join();
154	>	/**
155	>	* WriteLock.getHoldCount returns number of recursive holds
156	>	*/
157	>	public void testGetHoldCount() {
158	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
159	>	for (int i = 1; i <= SIZE; i++) {
160	>	lock.writeLock().lock();
161	>	assertEquals(i,lock.writeLock().getHoldCount());
162	>	}
163	>	for (int i = SIZE; i > 0; i--) {
164		lock.writeLock().unlock();
165	<	} catch(Exception e){
152	<	fail("unexpected exception");
165	>	assertEquals(i-1,lock.writeLock().getHoldCount());
166		}
167	<	}
167	>	}
168
169	<	public void testMultipleReadLocks() {
170	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
171	<	lock.readLock().lock();
172	<	Thread t = new Thread(new Runnable() {
173	<	public void run(){
174	<	threadAssertTrue(lock.readLock().tryLock());
175	<	lock.readLock().unlock();
176	<	}
164	<	});
165	<	try {
166	<	t.start();
167	<	t.join();
168	<	lock.readLock().unlock();
169	<	} catch(Exception e){
170	<	fail("unexpected exception");
169	>	/**
170	>	* getReadHoldCount returns number of recursive holds
171	>	*/
172	>	public void testGetReadHoldCount() {
173	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
174	>	for (int i = 1; i <= SIZE; i++) {
175	>	lock.readLock().lock();
176	>	assertEquals(i,lock.getReadHoldCount());
177		}
178	<	}
173	<
174	<	public void testWriteAfterMultipleReadLocks() {
175	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
176	<	lock.readLock().lock();
177	<	Thread t1 = new Thread(new Runnable() {
178	<	public void run(){
179	<	lock.readLock().lock();
180	<	lock.readLock().unlock();
181	<	}
182	<	});
183	<	Thread t2 = new Thread(new Runnable() {
184	<	public void run(){
185	<	lock.writeLock().lock();
186	<	lock.writeLock().unlock();
187	<	}
188	<	});
189	<
190	<	try {
191	<	t1.start();
192	<	t2.start();
193	<	Thread.sleep(SHORT_DELAY_MS);
194	<	lock.readLock().unlock();
195	<	t1.join(MEDIUM_DELAY_MS);
196	<	t2.join(MEDIUM_DELAY_MS);
197	<	assertTrue(!t1.isAlive());
198	<	assertTrue(!t2.isAlive());
199	<
200	<	} catch(Exception e){
201	<	fail("unexpected exception");
202	<	}
203	<	}
204	<
205	<	public void testReadAfterWriteLock() {
206	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
207	<	lock.writeLock().lock();
208	<	Thread t1 = new Thread(new Runnable() {
209	<	public void run(){
210	<	lock.readLock().lock();
211	<	lock.readLock().unlock();
212	<	}
213	<	});
214	<	Thread t2 = new Thread(new Runnable() {
215	<	public void run(){
216	<	lock.readLock().lock();
217	<	lock.readLock().unlock();
218	<	}
219	<	});
220	<
221	<	try {
222	<	t1.start();
223	<	t2.start();
224	<	Thread.sleep(SHORT_DELAY_MS);
225	<	lock.writeLock().unlock();
226	<	t1.join(MEDIUM_DELAY_MS);
227	<	t2.join(MEDIUM_DELAY_MS);
228	<	assertTrue(!t1.isAlive());
229	<	assertTrue(!t2.isAlive());
230	<
231	<	} catch(Exception e){
232	<	fail("unexpected exception");
233	<	}
234	<	}
235	<
236	<
237	<	public void testTryLockWhenReadLocked() {
238	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
239	<	lock.readLock().lock();
240	<	Thread t = new Thread(new Runnable() {
241	<	public void run(){
242	<	threadAssertTrue(lock.readLock().tryLock());
243	<	lock.readLock().unlock();
244	<	}
245	<	});
246	<	try {
247	<	t.start();
248	<	t.join();
178	>	for (int i = SIZE; i > 0; i--) {
179		lock.readLock().unlock();
180	<	} catch(Exception e){
251	<	fail("unexpected exception");
180	>	assertEquals(i-1,lock.getReadHoldCount());
181		}
182	<	}
182	>	}
183
255	–
184
185	<	public void testWriteTryLockWhenReadLocked() {
186	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
187	<	lock.readLock().lock();
188	<	Thread t = new Thread(new Runnable() {
189	<	public void run(){
262	<	threadAssertFalse(lock.writeLock().tryLock());
263	<	}
264	<	});
185	>	/**
186	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
187	>	*/
188	>	public void testUnlock_IllegalMonitorStateException() {
189	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
190		try {
191	<	t.start();
192	<	t.join();
193	<	lock.readLock().unlock();
194	<	} catch(Exception e){
270	<	fail("unexpected exception");
271	<	}
272	<	}
191	>	rl.writeLock().unlock();
192	>	shouldThrow();
193	>	} catch (IllegalMonitorStateException success) {}
194	>	}
195
274	–
196
197	<	public void testTryLock_Timeout(){
198	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
199	<	lock.writeLock().lock();
200	<	Thread t = new Thread(new Runnable() {
201	<	public void run(){
202	<	try {
203	<	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
204	<	} catch (Exception ex) {
205	<	threadFail("unexpected exception");
206	<	}
207	<	}
208	<	});
209	<	try {
210	<	t.start();
211	<	t.join();
212	<	lock.writeLock().unlock();
292	<	} catch(Exception e){
293	<	fail("unexpected exception");
294	<	}
295	<	}
197	>	/**
198	>	* write-lockInterruptibly is interruptible
199	>	*/
200	>	public void testWriteLockInterruptibly_Interrupted() throws Exception {
201	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
202	>	lock.writeLock().lock();
203	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
204	>	public void realRun() throws InterruptedException {
205	>	lock.writeLock().lockInterruptibly();
206	>	}});
207	>
208	>	Thread.sleep(SHORT_DELAY_MS);
209	>	t.interrupt();
210	>	awaitTermination(t, LONG_DELAY_MS);
211	>	releaseLock(lock.writeLock());
212	>	}
213
214	<	public void testTryLock_Timeout2(){
215	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
216	<	lock.writeLock().lock();
217	<	Thread t = new Thread(new Runnable() {
218	<	public void run(){
219	<	try {
220	<	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
221	<	} catch (Exception ex) {
222	<	threadFail("unexpected exception");
223	<	}
224	<	}
225	<	});
226	<	try {
227	<	t.start();
228	<	t.join();
229	<	lock.writeLock().unlock();
313	<	} catch(Exception e){
314	<	fail("unexpected exception");
315	<	}
316	<	}
214	>	/**
215	>	* timed write-tryLock is interruptible
216	>	*/
217	>	public void testWriteTryLock_Interrupted() throws InterruptedException {
218	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
219	>	lock.writeLock().lock();
220	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
221	>	public void realRun() throws InterruptedException {
222	>	lock.writeLock().tryLock(SMALL_DELAY_MS, MILLISECONDS);
223	>	}});
224	>
225	>	Thread.sleep(SHORT_DELAY_MS);
226	>	t.interrupt();
227	>	awaitTermination(t, LONG_DELAY_MS);
228	>	releaseLock(lock.writeLock());
229	>	}
230
231	+	/**
232	+	* read-lockInterruptibly is interruptible
233	+	*/
234	+	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
235	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
236	+	lock.writeLock().lock();
237	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
238	+	public void realRun() throws InterruptedException {
239	+	lock.readLock().lockInterruptibly();
240	+	}});
241	+
242	+	Thread.sleep(SHORT_DELAY_MS);
243	+	t.interrupt();
244	+	awaitTermination(t, LONG_DELAY_MS);
245	+	releaseLock(lock.writeLock());
246	+	}
247
248	<	public void testLockInterruptibly() {
249	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
250	<	try {
251	<	lock.writeLock().lockInterruptibly();
252	<	} catch(Exception e) {
253	<	fail("unexpected exception");
254	<	}
255	<	Thread t = new Thread(new Runnable() {
256	<	public void run() {
257	<	try {
258	<	lock.writeLock().lockInterruptibly();
259	<	threadFail("should throw");
260	<	}
261	<	catch(InterruptedException success) {
262	<	}
334	<	}
335	<	});
336	<	try {
337	<	t.start();
338	<	t.interrupt();
339	<	t.join();
340	<	lock.writeLock().unlock();
341	<	} catch(Exception e){
342	<	fail("unexpected exception");
343	<	}
248	>	/**
249	>	* timed read-tryLock is interruptible
250	>	*/
251	>	public void testReadTryLock_Interrupted() throws InterruptedException {
252	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
253	>	lock.writeLock().lock();
254	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
255	>	public void realRun() throws InterruptedException {
256	>	lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS);
257	>	}});
258	>
259	>	Thread.sleep(SHORT_DELAY_MS);
260	>	t.interrupt();
261	>	awaitTermination(t, LONG_DELAY_MS);
262	>	releaseLock(lock.writeLock());
263		}
264
265	<	public void testLockInterruptibly2() {
266	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
267	<	try {
268	<	lock.writeLock().lockInterruptibly();
269	<	} catch(Exception e) {
270	<	fail("unexpected exception");
271	<	}
272	<	Thread t = new Thread(new Runnable() {
273	<	public void run() {
274	<	try {
275	<	lock.readLock().lockInterruptibly();
276	<	threadFail("should throw");
277	<	}
278	<	catch(InterruptedException success) {
279	<	}
280	<	}
281	<	});
282	<	try {
283	<	t.start();
284	<	t.interrupt();
285	<	t.join();
286	<	lock.writeLock().unlock();
287	<	} catch(Exception e){
288	<	fail("unexpected exception");
289	<	}
265	>
266	>	/**
267	>	* write-tryLock fails if locked
268	>	*/
269	>	public void testWriteTryLockWhenLocked() throws InterruptedException {
270	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
271	>	lock.writeLock().lock();
272	>	Thread t = newStartedThread(new CheckedRunnable() {
273	>	public void realRun() {
274	>	assertFalse(lock.writeLock().tryLock());
275	>	}});
276	>
277	>	awaitTermination(t, LONG_DELAY_MS);
278	>	lock.writeLock().unlock();
279	>	}
280	>
281	>	/**
282	>	* read-tryLock fails if locked
283	>	*/
284	>	public void testReadTryLockWhenLocked() throws InterruptedException {
285	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
286	>	lock.writeLock().lock();
287	>	Thread t = newStartedThread(new CheckedRunnable() {
288	>	public void realRun() {
289	>	assertFalse(lock.readLock().tryLock());
290	>	}});
291	>
292	>	awaitTermination(t, LONG_DELAY_MS);
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 = newStartedThread(new CheckedRunnable() {
303	>	public void realRun() {
304	>	assertTrue(lock.readLock().tryLock());
305	>	lock.readLock().unlock();
306	>	}});
307	>
308	>	awaitTermination(t, LONG_DELAY_MS);
309	>	lock.readLock().unlock();
310	>	}
311	>
312	>	/**
313	>	* A writelock succeeds after reading threads unlock
314	>	*/
315	>	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
316	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
317	>	lock.readLock().lock();
318	>	Thread t1 = newStartedThread(new CheckedRunnable() {
319	>	public void realRun() {
320	>	lock.readLock().lock();
321	>	lock.readLock().unlock();
322	>	}});
323	>	Thread t2 = newStartedThread(new CheckedRunnable() {
324	>	public void realRun() {
325	>	lock.writeLock().lock();
326	>	lock.writeLock().unlock();
327	>	}});
328	>
329	>	Thread.sleep(SHORT_DELAY_MS);
330	>	lock.readLock().unlock();
331	>	awaitTermination(t1, LONG_DELAY_MS);
332	>	awaitTermination(t2, LONG_DELAY_MS);
333	>	}
334	>
335	>	/**
336	>	* Readlocks succeed after a writing thread unlocks
337	>	*/
338	>	public void testReadAfterWriteLock() throws InterruptedException {
339	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
340	>	lock.writeLock().lock();
341	>	Thread t1 = newStartedThread(new CheckedRunnable() {
342	>	public void realRun() {
343	>	lock.readLock().lock();
344	>	lock.readLock().unlock();
345	>	}});
346	>	Thread t2 = newStartedThread(new CheckedRunnable() {
347	>	public void realRun() {
348	>	lock.readLock().lock();
349	>	lock.readLock().unlock();
350	>	}});
351	>
352	>	Thread.sleep(SHORT_DELAY_MS);
353	>	lock.writeLock().unlock();
354	>	awaitTermination(t1, LONG_DELAY_MS);
355	>	awaitTermination(t2, LONG_DELAY_MS);
356	>	}
357	>
358	>	/**
359	>	* Read trylock succeeds if write locked by current thread
360	>	*/
361	>	public void testReadHoldingWriteLock() {
362	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
363	>	lock.writeLock().lock();
364	>	assertTrue(lock.readLock().tryLock());
365	>	lock.readLock().unlock();
366	>	lock.writeLock().unlock();
367	>	}
368	>
369	>	/**
370	>	* Read lock succeeds if write locked by current thread even if
371	>	* other threads are waiting for readlock
372	>	*/
373	>	public void testReadHoldingWriteLock2() throws InterruptedException {
374	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
375	>	lock.writeLock().lock();
376	>	Thread t1 = newStartedThread(new CheckedRunnable() {
377	>	public void realRun() {
378	>	lock.readLock().lock();
379	>	lock.readLock().unlock();
380	>	}});
381	>	Thread t2 = newStartedThread(new CheckedRunnable() {
382	>	public void realRun() {
383	>	lock.readLock().lock();
384	>	lock.readLock().unlock();
385	>	}});
386	>
387	>	lock.readLock().lock();
388	>	lock.readLock().unlock();
389	>	Thread.sleep(SHORT_DELAY_MS);
390	>	lock.readLock().lock();
391	>	lock.readLock().unlock();
392	>	lock.writeLock().unlock();
393	>	awaitTermination(t1, LONG_DELAY_MS);
394	>	awaitTermination(t2, LONG_DELAY_MS);
395	>	}
396	>
397	>	/**
398	>	* Read lock succeeds if write locked by current thread even if
399	>	* other threads are waiting for writelock
400	>	*/
401	>	public void testReadHoldingWriteLock3() throws InterruptedException {
402	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
403	>	lock.writeLock().lock();
404	>	Thread t1 = newStartedThread(new CheckedRunnable() {
405	>	public void realRun() {
406	>	lock.writeLock().lock();
407	>	lock.writeLock().unlock();
408	>	}});
409	>	Thread t2 = newStartedThread(new CheckedRunnable() {
410	>	public void realRun() {
411	>	lock.writeLock().lock();
412	>	lock.writeLock().unlock();
413	>	}});
414	>
415	>	lock.readLock().lock();
416	>	lock.readLock().unlock();
417	>	Thread.sleep(SHORT_DELAY_MS);
418	>	lock.readLock().lock();
419	>	lock.readLock().unlock();
420	>	lock.writeLock().unlock();
421	>	awaitTermination(t1, LONG_DELAY_MS);
422	>	awaitTermination(t2, LONG_DELAY_MS);
423	>	}
424	>
425	>
426	>	/**
427	>	* Write lock succeeds if write locked by current thread even if
428	>	* other threads are waiting for writelock
429	>	*/
430	>	public void testWriteHoldingWriteLock4() throws InterruptedException {
431	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
432	>	lock.writeLock().lock();
433	>	Thread t1 = newStartedThread(new CheckedRunnable() {
434	>	public void realRun() {
435	>	lock.writeLock().lock();
436	>	lock.writeLock().unlock();
437	>	}});
438	>	Thread t2 = newStartedThread(new CheckedRunnable() {
439	>	public void realRun() {
440	>	lock.writeLock().lock();
441	>	lock.writeLock().unlock();
442	>	}});
443	>
444	>	lock.writeLock().lock();
445	>	lock.writeLock().unlock();
446	>	Thread.sleep(SHORT_DELAY_MS);
447	>	lock.writeLock().lock();
448	>	lock.writeLock().unlock();
449	>	lock.writeLock().unlock();
450	>	awaitTermination(t1, LONG_DELAY_MS);
451	>	awaitTermination(t2, LONG_DELAY_MS);
452	>	}
453	>
454	>
455	>	/**
456	>	* Fair Read trylock succeeds if write locked by current thread
457	>	*/
458	>	public void testReadHoldingWriteLockFair() {
459	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
460	>	lock.writeLock().lock();
461	>	assertTrue(lock.readLock().tryLock());
462	>	lock.readLock().unlock();
463	>	lock.writeLock().unlock();
464	>	}
465	>
466	>	/**
467	>	* Fair Read lock succeeds if write locked by current thread even if
468	>	* other threads are waiting for readlock
469	>	*/
470	>	public void testReadHoldingWriteLockFair2() throws InterruptedException {
471	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
472	>	lock.writeLock().lock();
473	>	Thread t1 = newStartedThread(new CheckedRunnable() {
474	>	public void realRun() {
475	>	lock.readLock().lock();
476	>	lock.readLock().unlock();
477	>	}});
478	>	Thread t2 = newStartedThread(new CheckedRunnable() {
479	>	public void realRun() {
480	>	lock.readLock().lock();
481	>	lock.readLock().unlock();
482	>	}});
483	>
484	>	lock.readLock().lock();
485	>	lock.readLock().unlock();
486	>	Thread.sleep(SHORT_DELAY_MS);
487	>	lock.readLock().lock();
488	>	lock.readLock().unlock();
489	>	lock.writeLock().unlock();
490	>	awaitTermination(t1, LONG_DELAY_MS);
491	>	awaitTermination(t2, LONG_DELAY_MS);
492	>	}
493	>
494	>
495	>	/**
496	>	* Fair Read lock succeeds if write locked by current thread even if
497	>	* other threads are waiting for writelock
498	>	*/
499	>	public void testReadHoldingWriteLockFair3() throws InterruptedException {
500	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
501	>	lock.writeLock().lock();
502	>	Thread t1 = newStartedThread(new CheckedRunnable() {
503	>	public void realRun() {
504	>	lock.writeLock().lock();
505	>	lock.writeLock().unlock();
506	>	}});
507	>	Thread t2 = newStartedThread(new CheckedRunnable() {
508	>	public void realRun() {
509	>	lock.writeLock().lock();
510	>	lock.writeLock().unlock();
511	>	}});
512	>
513	>	lock.readLock().lock();
514	>	lock.readLock().unlock();
515	>	Thread.sleep(SHORT_DELAY_MS);
516	>	lock.readLock().lock();
517	>	lock.readLock().unlock();
518	>	lock.writeLock().unlock();
519	>	awaitTermination(t1, LONG_DELAY_MS);
520	>	awaitTermination(t2, LONG_DELAY_MS);
521	>	}
522	>
523	>
524	>	/**
525	>	* Fair Write lock succeeds if write locked by current thread even if
526	>	* other threads are waiting for writelock
527	>	*/
528	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
529	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
530	>	lock.writeLock().lock();
531	>	Thread t1 = newStartedThread(new CheckedRunnable() {
532	>	public void realRun() {
533	>	lock.writeLock().lock();
534	>	lock.writeLock().unlock();
535	>	}});
536	>	Thread t2 = newStartedThread(new CheckedRunnable() {
537	>	public void realRun() {
538	>	lock.writeLock().lock();
539	>	lock.writeLock().unlock();
540	>	}});
541	>
542	>	Thread.sleep(SHORT_DELAY_MS);
543	>	assertTrue(lock.isWriteLockedByCurrentThread());
544	>	assertEquals(1, lock.getWriteHoldCount());
545	>	lock.writeLock().lock();
546	>	assertEquals(2, lock.getWriteHoldCount());
547	>	lock.writeLock().unlock();
548	>	lock.writeLock().lock();
549	>	lock.writeLock().unlock();
550	>	lock.writeLock().unlock();
551	>	awaitTermination(t1, LONG_DELAY_MS);
552	>	awaitTermination(t2, LONG_DELAY_MS);
553	>	}
554	>
555	>
556	>	/**
557	>	* Read tryLock succeeds if readlocked but not writelocked
558	>	*/
559	>	public void testTryLockWhenReadLocked() throws InterruptedException {
560	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
561	>	lock.readLock().lock();
562	>	Thread t = newStartedThread(new CheckedRunnable() {
563	>	public void realRun() {
564	>	assertTrue(lock.readLock().tryLock());
565	>	lock.readLock().unlock();
566	>	}});
567	>
568	>	awaitTermination(t, LONG_DELAY_MS);
569	>	lock.readLock().unlock();
570		}
571
572	<	public void testAwait_IllegalMonitor() {
573	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
572	>	/**
573	>	* write tryLock fails when readlocked
574	>	*/
575	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
576	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
577	>	lock.readLock().lock();
578	>	Thread t = newStartedThread(new CheckedRunnable() {
579	>	public void realRun() {
580	>	assertFalse(lock.writeLock().tryLock());
581	>	}});
582	>
583	>	awaitTermination(t, LONG_DELAY_MS);
584	>	lock.readLock().unlock();
585	>	}
586	>
587	>
588	>	/**
589	>	* Fair Read tryLock succeeds if readlocked but not writelocked
590	>	*/
591	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
592	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
593	>	lock.readLock().lock();
594	>	Thread t = newStartedThread(new CheckedRunnable() {
595	>	public void realRun() {
596	>	assertTrue(lock.readLock().tryLock());
597	>	lock.readLock().unlock();
598	>	}});
599	>
600	>	awaitTermination(t, LONG_DELAY_MS);
601	>	lock.readLock().unlock();
602	>	}
603	>
604	>
605	>
606	>	/**
607	>	* Fair write tryLock fails when readlocked
608	>	*/
609	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
610	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
611	>	lock.readLock().lock();
612	>	Thread t = newStartedThread(new CheckedRunnable() {
613	>	public void realRun() {
614	>	assertFalse(lock.writeLock().tryLock());
615	>	}});
616	>
617	>	awaitTermination(t, LONG_DELAY_MS);
618	>	lock.readLock().unlock();
619	>	}
620	>
621	>
622	>
623	>	/**
624	>	* write timed tryLock times out if locked
625	>	*/
626	>	public void testWriteTryLock_Timeout() throws InterruptedException {
627	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
628	>	lock.writeLock().lock();
629	>	Thread t = newStartedThread(new CheckedRunnable() {
630	>	public void realRun() throws InterruptedException {
631	>	assertFalse(lock.writeLock().tryLock(1, MILLISECONDS));
632	>	}});
633	>
634	>	awaitTermination(t, LONG_DELAY_MS);
635	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
636	>	lock.writeLock().unlock();
637	>	}
638	>
639	>	/**
640	>	* read timed tryLock times out if write-locked
641	>	*/
642	>	public void testReadTryLock_Timeout() throws InterruptedException {
643	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
644	>	lock.writeLock().lock();
645	>	Thread t = newStartedThread(new CheckedRunnable() {
646	>	public void realRun() throws InterruptedException {
647	>	assertFalse(lock.readLock().tryLock(1, MILLISECONDS));
648	>	}});
649	>
650	>	awaitTermination(t, LONG_DELAY_MS);
651	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
652	>	lock.writeLock().unlock();
653	>	}
654	>
655	>
656	>	/**
657	>	* write lockInterruptibly succeeds if lock free else is interruptible
658	>	*/
659	>	public void testWriteLockInterruptibly() throws InterruptedException {
660	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
661	>	lock.writeLock().lockInterruptibly();
662	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
663	>	public void realRun() throws InterruptedException {
664	>	lock.writeLock().lockInterruptibly();
665	>	}});
666	>
667	>	Thread.sleep(SHORT_DELAY_MS);
668	>	t.interrupt();
669	>	awaitTermination(t, LONG_DELAY_MS);
670	>	releaseLock(lock.writeLock());
671	>	}
672	>
673	>	/**
674	>	* read lockInterruptibly succeeds if lock free else is interruptible
675	>	*/
676	>	public void testReadLockInterruptibly() throws InterruptedException {
677	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
678	>	lock.writeLock().lockInterruptibly();
679	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
680	>	public void realRun() throws InterruptedException {
681	>	lock.readLock().lockInterruptibly();
682	>	}});
683	>
684	>	Thread.sleep(SHORT_DELAY_MS);
685	>	t.interrupt();
686	>	awaitTermination(t, LONG_DELAY_MS);
687	>	releaseLock(lock.writeLock());
688	>	}
689	>
690	>	/**
691	>	* Calling await without holding lock throws IllegalMonitorStateException
692	>	*/
693	>	public void testAwait_IllegalMonitor() throws InterruptedException {
694	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
695		final Condition c = lock.writeLock().newCondition();
696		try {
697		c.await();
698	<	fail("should throw");
699	<	}
380	<	catch (IllegalMonitorStateException success) {
381	<	}
382	<	catch (Exception ex) {
383	<	fail("should throw IMSE");
384	<	}
698	>	shouldThrow();
699	>	} catch (IllegalMonitorStateException success) {}
700		}
701
702	+	/**
703	+	* Calling signal without holding lock throws IllegalMonitorStateException
704	+	*/
705		public void testSignal_IllegalMonitor() {
706	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
706	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
707		final Condition c = lock.writeLock().newCondition();
708		try {
709		c.signal();
710	<	fail("should throw");
711	<	}
394	<	catch (IllegalMonitorStateException success) {
395	<	}
396	<	catch (Exception ex) {
397	<	fail("should throw IMSE");
398	<	}
710	>	shouldThrow();
711	>	} catch (IllegalMonitorStateException success) {}
712		}
713
714	<	public void testAwaitNanos_Timeout() {
715	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
714	>	/**
715	>	* awaitNanos without a signal times out
716	>	*/
717	>	public void testAwaitNanos_Timeout() throws InterruptedException {
718	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
719		final Condition c = lock.writeLock().newCondition();
720	<	try {
721	<	lock.writeLock().lock();
722	<	long t = c.awaitNanos(100);
723	<	assertTrue(t <= 0);
724	<	lock.writeLock().unlock();
409	<	}
410	<	catch (Exception ex) {
411	<	fail("unexpected exception");
412	<	}
720	>
721	>	lock.writeLock().lock();
722	>	long t = c.awaitNanos(100);
723	>	assertTrue(t <= 0);
724	>	lock.writeLock().unlock();
725		}
726
727	<	public void testAwait_Timeout() {
728	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
727	>
728	>	/**
729	>	* timed await without a signal times out
730	>	*/
731	>	public void testAwait_Timeout() throws InterruptedException {
732	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
733		final Condition c = lock.writeLock().newCondition();
734	<	try {
735	<	lock.writeLock().lock();
736	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
421	<	lock.writeLock().unlock();
422	<	}
423	<	catch (Exception ex) {
424	<	fail("unexpected exception");
425	<	}
734	>	lock.writeLock().lock();
735	>	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
736	>	lock.writeLock().unlock();
737		}
738
739	<	public void testAwaitUntil_Timeout() {
740	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
739	>	/**
740	>	* awaitUntil without a signal times out
741	>	*/
742	>	public void testAwaitUntil_Timeout() throws InterruptedException {
743	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
744		final Condition c = lock.writeLock().newCondition();
745	<	try {
746	<	lock.writeLock().lock();
747	<	java.util.Date d = new java.util.Date();
748	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
435	<	lock.writeLock().unlock();
436	<	}
437	<	catch (Exception ex) {
438	<	fail("unexpected exception");
439	<	}
745	>	lock.writeLock().lock();
746	>	java.util.Date d = new java.util.Date();
747	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
748	>	lock.writeLock().unlock();
749		}
750
751	<	public void testAwait() {
752	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
751	>	/**
752	>	* await returns when signalled
753	>	*/
754	>	public void testAwait() throws InterruptedException {
755	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
756		final Condition c = lock.writeLock().newCondition();
757	<	Thread t = new Thread(new Runnable() {
758	<	public void run() {
759	<	try {
760	<	lock.writeLock().lock();
761	<	c.await();
762	<	lock.writeLock().unlock();
763	<	}
764	<	catch(InterruptedException e) {
765	<	threadFail("unexpected exception");
766	<	}
767	<	}
768	<	});
757	>	Thread t = newStartedThread(new CheckedRunnable() {
758	>	public void realRun() throws InterruptedException {
759	>	lock.writeLock().lock();
760	>	c.await();
761	>	lock.writeLock().unlock();
762	>	}});
763	>
764	>	Thread.sleep(SHORT_DELAY_MS);
765	>	lock.writeLock().lock();
766	>	c.signal();
767	>	lock.writeLock().unlock();
768	>	awaitTermination(t, LONG_DELAY_MS);
769	>	}
770
771	<	try {
772	<	t.start();
773	<	Thread.sleep(SHORT_DELAY_MS);
774	<	lock.writeLock().lock();
775	<	c.signal();
776	<	lock.writeLock().unlock();
777	<	t.join(SHORT_DELAY_MS);
778	<	assertFalse(t.isAlive());
779	<	}
780	<	catch (Exception ex) {
781	<	fail("unexpected exception");
771	>	/** A helper class for uninterruptible wait tests */
772	>	class UninterruptableThread extends Thread {
773	>	private Lock lock;
774	>	private Condition c;
775	>
776	>	public volatile boolean canAwake = false;
777	>	public volatile boolean interrupted = false;
778	>	public volatile boolean lockStarted = false;
779	>
780	>	public UninterruptableThread(Lock lock, Condition c) {
781	>	this.lock = lock;
782	>	this.c = c;
783	>	}
784	>
785	>	public synchronized void run() {
786	>	lock.lock();
787	>	lockStarted = true;
788	>
789	>	while (!canAwake) {
790	>	c.awaitUninterruptibly();
791	>	}
792	>
793	>	interrupted = isInterrupted();
794	>	lock.unlock();
795		}
796		}
797
798	<	public void testAwaitUninterruptibly() {
799	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
798	>	/**
799	>	* awaitUninterruptibly doesn't abort on interrupt
800	>	*/
801	>	public void testAwaitUninterruptibly() throws InterruptedException {
802	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
803		final Condition c = lock.writeLock().newCondition();
804	<	Thread t = new Thread(new Runnable() {
805	<	public void run() {
806	<	lock.writeLock().lock();
478	<	c.awaitUninterruptibly();
479	<	lock.writeLock().unlock();
480	<	}
481	<	});
804	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
805	>
806	>	thread.start();
807
808	+	while (!thread.lockStarted) {
809	+	Thread.sleep(100);
810	+	}
811	+
812	+	lock.writeLock().lock();
813		try {
814	<	t.start();
815	<	Thread.sleep(SHORT_DELAY_MS);
486	<	t.interrupt();
487	<	lock.writeLock().lock();
814	>	thread.interrupt();
815	>	thread.canAwake = true;
816		c.signal();
817	+	} finally {
818		lock.writeLock().unlock();
490	–	t.join(SHORT_DELAY_MS);
491	–	assertFalse(t.isAlive());
492	–	}
493	–	catch (Exception ex) {
494	–	fail("unexpected exception");
819		}
820	+
821	+	awaitTermination(thread, LONG_DELAY_MS);
822	+	assertTrue(thread.interrupted);
823		}
824
825	<	public void testAwait_Interrupt() {
826	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
827	<	final Condition c = lock.writeLock().newCondition();
828	<	Thread t = new Thread(new Runnable() {
829	<	public void run() {
830	<	try {
831	<	lock.writeLock().lock();
832	<	c.await();
833	<	lock.writeLock().unlock();
834	<	threadFail("should throw");
835	<	}
836	<	catch(InterruptedException success) {
837	<	}
838	<	}
839	<	});
840	<
841	<	try {
842	<	t.start();
843	<	Thread.sleep(SHORT_DELAY_MS);
844	<	t.interrupt();
845	<	t.join(SHORT_DELAY_MS);
846	<	assertFalse(t.isAlive());
520	<	}
521	<	catch (Exception ex) {
522	<	fail("unexpected exception");
523	<	}
524	<	}
525	<
526	<	public void testAwaitNanos_Interrupt() {
527	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
528	<	final Condition c = lock.writeLock().newCondition();
529	<	Thread t = new Thread(new Runnable() {
530	<	public void run() {
531	<	try {
532	<	lock.writeLock().lock();
533	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
534	<	lock.writeLock().unlock();
535	<	threadFail("should throw");
536	<	}
537	<	catch(InterruptedException success) {
538	<	}
539	<	}
540	<	});
541	<
542	<	try {
543	<	t.start();
544	<	Thread.sleep(SHORT_DELAY_MS);
545	<	t.interrupt();
546	<	t.join(SHORT_DELAY_MS);
547	<	assertFalse(t.isAlive());
548	<	}
549	<	catch (Exception ex) {
550	<	fail("unexpected exception");
551	<	}
552	<	}
553	<
554	<	public void testAwaitUntil_Interrupt() {
555	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
556	<	final Condition c = lock.writeLock().newCondition();
557	<	Thread t = new Thread(new Runnable() {
558	<	public void run() {
559	<	try {
560	<	lock.writeLock().lock();
561	<	java.util.Date d = new java.util.Date();
562	<	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
563	<	lock.writeLock().unlock();
564	<	threadFail("should throw");
565	<	}
566	<	catch(InterruptedException success) {
567	<	}
568	<	}
569	<	});
570	<
571	<	try {
572	<	t.start();
573	<	Thread.sleep(SHORT_DELAY_MS);
574	<	t.interrupt();
575	<	t.join(SHORT_DELAY_MS);
576	<	assertFalse(t.isAlive());
577	<	}
578	<	catch (Exception ex) {
579	<	fail("unexpected exception");
580	<	}
581	<	}
582	<
583	<	public void testSignalAll() {
584	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
585	<	final Condition c = lock.writeLock().newCondition();
586	<	Thread t1 = new Thread(new Runnable() {
587	<	public void run() {
588	<	try {
589	<	lock.writeLock().lock();
590	<	c.await();
591	<	lock.writeLock().unlock();
592	<	}
593	<	catch(InterruptedException e) {
594	<	threadFail("unexpected exception");
595	<	}
596	<	}
597	<	});
598	<
599	<	Thread t2 = new Thread(new Runnable() {
600	<	public void run() {
601	<	try {
602	<	lock.writeLock().lock();
603	<	c.await();
604	<	lock.writeLock().unlock();
605	<	}
606	<	catch(InterruptedException e) {
607	<	threadFail("unexpected exception");
608	<	}
609	<	}
610	<	});
611	<
612	<	try {
613	<	t1.start();
614	<	t2.start();
615	<	Thread.sleep(SHORT_DELAY_MS);
616	<	lock.writeLock().lock();
617	<	c.signalAll();
618	<	lock.writeLock().unlock();
619	<	t1.join(SHORT_DELAY_MS);
620	<	t2.join(SHORT_DELAY_MS);
621	<	assertFalse(t1.isAlive());
622	<	assertFalse(t2.isAlive());
623	<	}
624	<	catch (Exception ex) {
625	<	fail("unexpected exception");
626	<	}
825	>	/**
826	>	* await is interruptible
827	>	*/
828	>	public void testAwait_Interrupt() throws InterruptedException {
829	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
830	>	final Condition c = lock.writeLock().newCondition();
831	>	final CountDownLatch locked = new CountDownLatch(1);
832	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
833	>	public void realRun() throws InterruptedException {
834	>	lock.writeLock().lock();
835	>	assertTrue(lock.isWriteLocked());
836	>	locked.countDown();
837	>	try { c.await(); }
838	>	finally { lock.writeLock().unlock(); }
839	>	}});
840	>
841	>	locked.await();
842	>	while (lock.isWriteLocked())
843	>	Thread.yield();
844	>	t.interrupt();
845	>	awaitTermination(t, LONG_DELAY_MS);
846	>	assertFalse(lock.isWriteLocked());
847		}
848
849	<	public void testSerialization() {
849	>	/**
850	>	* awaitNanos is interruptible
851	>	*/
852	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
853	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
854	>	final Condition c = lock.writeLock().newCondition();
855	>	final CountDownLatch locked = new CountDownLatch(1);
856	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
857	>	public void realRun() throws InterruptedException {
858	>	lock.writeLock().lock();
859	>	assertTrue(lock.isWriteLocked());
860	>	locked.countDown();
861	>	try { c.awaitNanos(MILLISECONDS.toNanos(LONG_DELAY_MS)); }
862	>	finally { lock.writeLock().unlock(); }
863	>	}});
864	>
865	>	locked.await();
866	>	while (lock.isWriteLocked())
867	>	Thread.yield();
868	>	t.interrupt();
869	>	awaitTermination(t, LONG_DELAY_MS);
870	>	assertFalse(lock.isWriteLocked());
871	>	}
872	>
873	>	/**
874	>	* awaitUntil is interruptible
875	>	*/
876	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
877	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
878	>	final Condition c = lock.writeLock().newCondition();
879	>	final CountDownLatch locked = new CountDownLatch(1);
880	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
881	>	public void realRun() throws InterruptedException {
882	>	lock.writeLock().lock();
883	>	assertTrue(lock.isWriteLocked());
884	>	locked.countDown();
885	>	java.util.Date d = new java.util.Date();
886	>	try { c.awaitUntil(new java.util.Date(d.getTime() + 10000)); }
887	>	finally { lock.writeLock().unlock(); }
888	>	}});
889	>
890	>	locked.await();
891	>	while (lock.isWriteLocked())
892	>	Thread.yield();
893	>	t.interrupt();
894	>	awaitTermination(t, LONG_DELAY_MS);
895	>	assertFalse(lock.isWriteLocked());
896	>	}
897	>
898	>	/**
899	>	* signalAll wakes up all threads
900	>	*/
901	>	public void testSignalAll() throws InterruptedException {
902	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
903	>	final Condition c = lock.writeLock().newCondition();
904	>	Thread t1 = newStartedThread(new CheckedRunnable() {
905	>	public void realRun() throws InterruptedException {
906	>	lock.writeLock().lock();
907	>	c.await();
908	>	lock.writeLock().unlock();
909	>	}});
910	>
911	>	Thread t2 = newStartedThread(new CheckedRunnable() {
912	>	public void realRun() throws InterruptedException {
913	>	lock.writeLock().lock();
914	>	c.await();
915	>	lock.writeLock().unlock();
916	>	}});
917	>
918	>	Thread.sleep(SHORT_DELAY_MS);
919	>	lock.writeLock().lock();
920	>	c.signalAll();
921	>	lock.writeLock().unlock();
922	>	awaitTermination(t1, LONG_DELAY_MS);
923	>	awaitTermination(t2, LONG_DELAY_MS);
924	>	}
925	>
926	>	/**
927	>	* A serialized lock deserializes as unlocked
928	>	*/
929	>	public void testSerialization() throws Exception {
930		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
931		l.readLock().lock();
932		l.readLock().unlock();
933
934	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
935	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
936	+	out.writeObject(l);
937	+	out.close();
938	+
939	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
940	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
941	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
942	+	r.readLock().lock();
943	+	r.readLock().unlock();
944	+	}
945	+
946	+	/**
947	+	* hasQueuedThreads reports whether there are waiting threads
948	+	*/
949	+	public void testhasQueuedThreads() throws InterruptedException {
950	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
951	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
952	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
953	+	assertFalse(lock.hasQueuedThreads());
954	+	lock.writeLock().lock();
955	+	t1.start();
956	+	Thread.sleep(SHORT_DELAY_MS);
957	+	assertTrue(lock.hasQueuedThreads());
958	+	t2.start();
959	+	Thread.sleep(SHORT_DELAY_MS);
960	+	assertTrue(lock.hasQueuedThreads());
961	+	t1.interrupt();
962	+	Thread.sleep(SHORT_DELAY_MS);
963	+	assertTrue(lock.hasQueuedThreads());
964	+	lock.writeLock().unlock();
965	+	Thread.sleep(SHORT_DELAY_MS);
966	+	assertFalse(lock.hasQueuedThreads());
967	+	awaitTermination(t1, LONG_DELAY_MS);
968	+	awaitTermination(t2, LONG_DELAY_MS);
969	+	}
970	+
971	+	/**
972	+	* hasQueuedThread(null) throws NPE
973	+	*/
974	+	public void testHasQueuedThreadNPE() {
975	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
976		try {
977	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
978	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
979	<	out.writeObject(l);
638	<	out.close();
639	<
640	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
641	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
642	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
643	<	r.readLock().lock();
644	<	r.readLock().unlock();
645	<	} catch(Exception e){
646	<	e.printStackTrace();
647	<	fail("unexpected exception");
648	<	}
977	>	sync.hasQueuedThread(null);
978	>	shouldThrow();
979	>	} catch (NullPointerException success) {}
980		}
981
982	+	/**
983	+	* hasQueuedThread reports whether a thread is queued.
984	+	*/
985	+	public void testHasQueuedThread() throws InterruptedException {
986	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
987	+	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
988	+	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
989	+	assertFalse(sync.hasQueuedThread(t1));
990	+	assertFalse(sync.hasQueuedThread(t2));
991	+	sync.writeLock().lock();
992	+	t1.start();
993	+	Thread.sleep(SHORT_DELAY_MS);
994	+	assertTrue(sync.hasQueuedThread(t1));
995	+	t2.start();
996	+	Thread.sleep(SHORT_DELAY_MS);
997	+	assertTrue(sync.hasQueuedThread(t1));
998	+	assertTrue(sync.hasQueuedThread(t2));
999	+	t1.interrupt();
1000	+	Thread.sleep(SHORT_DELAY_MS);
1001	+	assertFalse(sync.hasQueuedThread(t1));
1002	+	assertTrue(sync.hasQueuedThread(t2));
1003	+	sync.writeLock().unlock();
1004	+	Thread.sleep(SHORT_DELAY_MS);
1005	+	assertFalse(sync.hasQueuedThread(t1));
1006	+	Thread.sleep(SHORT_DELAY_MS);
1007	+	assertFalse(sync.hasQueuedThread(t2));
1008	+	awaitTermination(t1, LONG_DELAY_MS);
1009	+	awaitTermination(t2, LONG_DELAY_MS);
1010	+	}
1011	+
1012	+
1013	+	/**
1014	+	* getQueueLength reports number of waiting threads
1015	+	*/
1016	+	public void testGetQueueLength() throws InterruptedException {
1017	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1018	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1019	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1020	+	assertEquals(0, lock.getQueueLength());
1021	+	lock.writeLock().lock();
1022	+	t1.start();
1023	+	Thread.sleep(SHORT_DELAY_MS);
1024	+	assertEquals(1, lock.getQueueLength());
1025	+	t2.start();
1026	+	Thread.sleep(SHORT_DELAY_MS);
1027	+	assertEquals(2, lock.getQueueLength());
1028	+	t1.interrupt();
1029	+	Thread.sleep(SHORT_DELAY_MS);
1030	+	assertEquals(1, lock.getQueueLength());
1031	+	lock.writeLock().unlock();
1032	+	Thread.sleep(SHORT_DELAY_MS);
1033	+	assertEquals(0, lock.getQueueLength());
1034	+	awaitTermination(t1, LONG_DELAY_MS);
1035	+	awaitTermination(t2, LONG_DELAY_MS);
1036	+	}
1037	+
1038	+	/**
1039	+	* getQueuedThreads includes waiting threads
1040	+	*/
1041	+	public void testGetQueuedThreads() throws InterruptedException {
1042	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1043	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1044	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1045	+	assertTrue(lock.getQueuedThreads().isEmpty());
1046	+	lock.writeLock().lock();
1047	+	assertTrue(lock.getQueuedThreads().isEmpty());
1048	+	t1.start();
1049	+	Thread.sleep(SHORT_DELAY_MS);
1050	+	assertTrue(lock.getQueuedThreads().contains(t1));
1051	+	t2.start();
1052	+	Thread.sleep(SHORT_DELAY_MS);
1053	+	assertTrue(lock.getQueuedThreads().contains(t1));
1054	+	assertTrue(lock.getQueuedThreads().contains(t2));
1055	+	t1.interrupt();
1056	+	Thread.sleep(SHORT_DELAY_MS);
1057	+	assertFalse(lock.getQueuedThreads().contains(t1));
1058	+	assertTrue(lock.getQueuedThreads().contains(t2));
1059	+	lock.writeLock().unlock();
1060	+	Thread.sleep(SHORT_DELAY_MS);
1061	+	assertTrue(lock.getQueuedThreads().isEmpty());
1062	+	awaitTermination(t1, LONG_DELAY_MS);
1063	+	awaitTermination(t2, LONG_DELAY_MS);
1064	+	}
1065	+
1066	+	/**
1067	+	* hasWaiters throws NPE if null
1068	+	*/
1069	+	public void testHasWaitersNPE() {
1070	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1071	+	try {
1072	+	lock.hasWaiters(null);
1073	+	shouldThrow();
1074	+	} catch (NullPointerException success) {}
1075	+	}
1076	+
1077	+	/**
1078	+	* getWaitQueueLength throws NPE if null
1079	+	*/
1080	+	public void testGetWaitQueueLengthNPE() {
1081	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1082	+	try {
1083	+	lock.getWaitQueueLength(null);
1084	+	shouldThrow();
1085	+	} catch (NullPointerException success) {}
1086	+	}
1087	+
1088	+
1089	+	/**
1090	+	* getWaitingThreads throws NPE if null
1091	+	*/
1092	+	public void testGetWaitingThreadsNPE() {
1093	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1094	+	try {
1095	+	lock.getWaitingThreads(null);
1096	+	shouldThrow();
1097	+	} catch (NullPointerException success) {}
1098	+	}
1099	+
1100	+	/**
1101	+	* hasWaiters throws IAE if not owned
1102	+	*/
1103	+	public void testHasWaitersIAE() {
1104	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1105	+	final Condition c = lock.writeLock().newCondition();
1106	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1107	+	try {
1108	+	lock2.hasWaiters(c);
1109	+	shouldThrow();
1110	+	} catch (IllegalArgumentException success) {}
1111	+	}
1112	+
1113	+	/**
1114	+	* hasWaiters throws IMSE if not locked
1115	+	*/
1116	+	public void testHasWaitersIMSE() {
1117	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1118	+	final Condition c = lock.writeLock().newCondition();
1119	+	try {
1120	+	lock.hasWaiters(c);
1121	+	shouldThrow();
1122	+	} catch (IllegalMonitorStateException success) {}
1123	+	}
1124	+
1125	+
1126	+	/**
1127	+	* getWaitQueueLength throws IAE if not owned
1128	+	*/
1129	+	public void testGetWaitQueueLengthIAE() {
1130	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1131	+	final Condition c = lock.writeLock().newCondition();
1132	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1133	+	try {
1134	+	lock2.getWaitQueueLength(c);
1135	+	shouldThrow();
1136	+	} catch (IllegalArgumentException success) {}
1137	+	}
1138	+
1139	+	/**
1140	+	* getWaitQueueLength throws IMSE if not locked
1141	+	*/
1142	+	public void testGetWaitQueueLengthIMSE() {
1143	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1144	+	final Condition c = lock.writeLock().newCondition();
1145	+	try {
1146	+	lock.getWaitQueueLength(c);
1147	+	shouldThrow();
1148	+	} catch (IllegalMonitorStateException success) {}
1149	+	}
1150	+
1151	+
1152	+	/**
1153	+	* getWaitingThreads throws IAE if not owned
1154	+	*/
1155	+	public void testGetWaitingThreadsIAE() {
1156	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1157	+	final Condition c = lock.writeLock().newCondition();
1158	+	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1159	+	try {
1160	+	lock2.getWaitingThreads(c);
1161	+	shouldThrow();
1162	+	} catch (IllegalArgumentException success) {}
1163	+	}
1164	+
1165	+	/**
1166	+	* getWaitingThreads throws IMSE if not locked
1167	+	*/
1168	+	public void testGetWaitingThreadsIMSE() {
1169	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1170	+	final Condition c = lock.writeLock().newCondition();
1171	+	try {
1172	+	lock.getWaitingThreads(c);
1173	+	shouldThrow();
1174	+	} catch (IllegalMonitorStateException success) {}
1175	+	}
1176	+
1177	+
1178	+	/**
1179	+	* hasWaiters returns true when a thread is waiting, else false
1180	+	*/
1181	+	public void testHasWaiters() throws InterruptedException {
1182	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1183	+	final Condition c = lock.writeLock().newCondition();
1184	+	Thread t = newStartedThread(new CheckedRunnable() {
1185	+	public void realRun() throws InterruptedException {
1186	+	lock.writeLock().lock();
1187	+	assertFalse(lock.hasWaiters(c));
1188	+	assertEquals(0, lock.getWaitQueueLength(c));
1189	+	c.await();
1190	+	lock.writeLock().unlock();
1191	+	}});
1192	+
1193	+	Thread.sleep(SHORT_DELAY_MS);
1194	+	lock.writeLock().lock();
1195	+	assertTrue(lock.hasWaiters(c));
1196	+	assertEquals(1, lock.getWaitQueueLength(c));
1197	+	c.signal();
1198	+	lock.writeLock().unlock();
1199	+	Thread.sleep(SHORT_DELAY_MS);
1200	+	lock.writeLock().lock();
1201	+	assertFalse(lock.hasWaiters(c));
1202	+	assertEquals(0, lock.getWaitQueueLength(c));
1203	+	lock.writeLock().unlock();
1204	+	awaitTermination(t, LONG_DELAY_MS);
1205	+	}
1206	+
1207	+	/**
1208	+	* getWaitQueueLength returns number of waiting threads
1209	+	*/
1210	+	public void testGetWaitQueueLength() throws InterruptedException {
1211	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1212	+	final Condition c = lock.writeLock().newCondition();
1213	+	Thread t = newStartedThread(new CheckedRunnable() {
1214	+	public void realRun() throws InterruptedException {
1215	+	lock.writeLock().lock();
1216	+	assertFalse(lock.hasWaiters(c));
1217	+	assertEquals(0, lock.getWaitQueueLength(c));
1218	+	c.await();
1219	+	lock.writeLock().unlock();
1220	+	}});
1221	+
1222	+	Thread.sleep(SHORT_DELAY_MS);
1223	+	lock.writeLock().lock();
1224	+	assertTrue(lock.hasWaiters(c));
1225	+	assertEquals(1, lock.getWaitQueueLength(c));
1226	+	c.signal();
1227	+	lock.writeLock().unlock();
1228	+	Thread.sleep(SHORT_DELAY_MS);
1229	+	lock.writeLock().lock();
1230	+	assertFalse(lock.hasWaiters(c));
1231	+	assertEquals(0, lock.getWaitQueueLength(c));
1232	+	lock.writeLock().unlock();
1233	+	awaitTermination(t, LONG_DELAY_MS);
1234	+	}
1235	+
1236	+
1237	+	/**
1238	+	* getWaitingThreads returns only and all waiting threads
1239	+	*/
1240	+	public void testGetWaitingThreads() throws InterruptedException {
1241	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1242	+	final Condition c = lock.writeLock().newCondition();
1243	+	Thread t1 = new Thread(new CheckedRunnable() {
1244	+	public void realRun() throws InterruptedException {
1245	+	lock.writeLock().lock();
1246	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1247	+	c.await();
1248	+	lock.writeLock().unlock();
1249	+	}});
1250	+
1251	+	Thread t2 = new Thread(new CheckedRunnable() {
1252	+	public void realRun() throws InterruptedException {
1253	+	lock.writeLock().lock();
1254	+	assertFalse(lock.getWaitingThreads(c).isEmpty());
1255	+	c.await();
1256	+	lock.writeLock().unlock();
1257	+	}});
1258	+
1259	+	lock.writeLock().lock();
1260	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1261	+	lock.writeLock().unlock();
1262	+	t1.start();
1263	+	Thread.sleep(SHORT_DELAY_MS);
1264	+	t2.start();
1265	+	Thread.sleep(SHORT_DELAY_MS);
1266	+	lock.writeLock().lock();
1267	+	assertTrue(lock.hasWaiters(c));
1268	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1269	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1270	+	c.signalAll();
1271	+	lock.writeLock().unlock();
1272	+	Thread.sleep(SHORT_DELAY_MS);
1273	+	lock.writeLock().lock();
1274	+	assertFalse(lock.hasWaiters(c));
1275	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1276	+	lock.writeLock().unlock();
1277	+	awaitTermination(t1, LONG_DELAY_MS);
1278	+	awaitTermination(t2, LONG_DELAY_MS);
1279	+	}
1280	+
1281	+	/**
1282	+	* toString indicates current lock state
1283	+	*/
1284	+	public void testToString() {
1285	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1286	+	String us = lock.toString();
1287	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1288	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1289	+	lock.writeLock().lock();
1290	+	String ws = lock.toString();
1291	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1292	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1293	+	lock.writeLock().unlock();
1294	+	lock.readLock().lock();
1295	+	lock.readLock().lock();
1296	+	String rs = lock.toString();
1297	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1298	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1299	+	}
1300	+
1301	+	/**
1302	+	* readLock.toString indicates current lock state
1303	+	*/
1304	+	public void testReadLockToString() {
1305	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1306	+	String us = lock.readLock().toString();
1307	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1308	+	lock.readLock().lock();
1309	+	lock.readLock().lock();
1310	+	String rs = lock.readLock().toString();
1311	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1312	+	}
1313	+
1314	+	/**
1315	+	* writeLock.toString indicates current lock state
1316	+	*/
1317	+	public void testWriteLockToString() {
1318	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1319	+	String us = lock.writeLock().toString();
1320	+	assertTrue(us.indexOf("Unlocked") >= 0);
1321	+	lock.writeLock().lock();
1322	+	String ls = lock.writeLock().toString();
1323	+	assertTrue(ls.indexOf("Locked") >= 0);
1324	+	}
1325
1326		}

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