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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 1.45 by jsr166, Sun May 1 23:49:41 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	+	* Constructor sets given fairness, and is in unlocked state
63	+	*/
64	+	public void testConstructor() {
65	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
66	+	assertFalse(rl.isFair());
67	+	assertFalse(rl.isWriteLocked());
68	+	assertEquals(0, rl.getReadLockCount());
69	+	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
70	+	assertTrue(r2.isFair());
71	+	assertFalse(r2.isWriteLocked());
72	+	assertEquals(0, r2.getReadLockCount());
73	+	ReentrantReadWriteLock r3 = new ReentrantReadWriteLock(false);
74	+	assertFalse(r3.isFair());
75	+	assertFalse(r3.isWriteLocked());
76	+	assertEquals(0, r3.getReadLockCount());
77	+	}
78
79	+	/**
80	+	* write-locking and read-locking an unlocked lock succeed
81	+	*/
82	+	public void testLock() {
83	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
84	+	rl.writeLock().lock();
85	+	assertTrue(rl.isWriteLocked());
86	+	assertTrue(rl.isWriteLockedByCurrentThread());
87	+	assertTrue(rl.writeLock().isHeldByCurrentThread());
88	+	assertEquals(0, rl.getReadLockCount());
89	+	rl.writeLock().unlock();
90	+	assertFalse(rl.isWriteLocked());
91	+	assertFalse(rl.isWriteLockedByCurrentThread());
92	+	assertFalse(rl.writeLock().isHeldByCurrentThread());
93	+	assertEquals(0, rl.getReadLockCount());
94	+	rl.readLock().lock();
95	+	assertFalse(rl.isWriteLocked());
96	+	assertFalse(rl.isWriteLockedByCurrentThread());
97	+	assertEquals(1, rl.getReadLockCount());
98	+	rl.readLock().unlock();
99	+	assertFalse(rl.isWriteLocked());
100	+	assertFalse(rl.isWriteLockedByCurrentThread());
101	+	assertEquals(0, rl.getReadLockCount());
102	+	}
103
104	<	public void testInterruptedException(){
105	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
106	<	lock.writeLock().lock();
107	<	Thread t = new Thread(new Runnable() {
108	<	public void run(){
109	<	try{
110	<	lock.writeLock().lockInterruptibly();
111	<	threadFail("should throw");
112	<	}catch(InterruptedException success){}
113	<	}
114	<	});
115	<	try {
116	<	t.start();
117	<	t.interrupt();
118	<	lock.writeLock().unlock();
119	<	t.join();
120	<	} catch(Exception e){
121	<	fail("unexpected exception");
122	<	}
123	<	}
124	<
125	<	public void testInterruptedException2(){
126	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
127	<	lock.writeLock().lock();
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	<	}
104	>
105	>	/**
106	>	* locking an unlocked fair lock succeeds
107	>	*/
108	>	public void testFairLock() {
109	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
110	>	rl.writeLock().lock();
111	>	assertTrue(rl.isWriteLocked());
112	>	assertTrue(rl.isWriteLockedByCurrentThread());
113	>	assertTrue(rl.writeLock().isHeldByCurrentThread());
114	>	assertEquals(0, rl.getReadLockCount());
115	>	rl.writeLock().unlock();
116	>	assertFalse(rl.isWriteLocked());
117	>	assertFalse(rl.isWriteLockedByCurrentThread());
118	>	assertFalse(rl.writeLock().isHeldByCurrentThread());
119	>	assertEquals(0, rl.getReadLockCount());
120	>	rl.readLock().lock();
121	>	assertFalse(rl.isWriteLocked());
122	>	assertFalse(rl.isWriteLockedByCurrentThread());
123	>	assertEquals(1, rl.getReadLockCount());
124	>	rl.readLock().unlock();
125	>	assertFalse(rl.isWriteLocked());
126	>	assertFalse(rl.isWriteLockedByCurrentThread());
127	>	assertEquals(0, rl.getReadLockCount());
128		}
129
130	<	public void testInterruptedException3(){
131	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
132	<	lock.writeLock().lock();
133	<	Thread t = new Thread(new Runnable() {
134	<	public void run(){
135	<	try{
136	<	lock.readLock().lockInterruptibly();
137	<	threadFail("should throw");
138	<	}catch(InterruptedException success){}
139	<	}
90	<	});
91	<	try {
92	<	t.start();
93	<	t.interrupt();
130	>	/**
131	>	* getWriteHoldCount returns number of recursive holds
132	>	*/
133	>	public void testGetWriteHoldCount() {
134	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
135	>	for (int i = 1; i <= SIZE; i++) {
136	>	lock.writeLock().lock();
137	>	assertEquals(i,lock.getWriteHoldCount());
138	>	}
139	>	for (int i = SIZE; i > 0; i--) {
140		lock.writeLock().unlock();
141	<	t.join();
96	<	} catch(Exception e){
97	<	fail("unexpected exception");
98	<	}
99	<	}
100	<
101	<	public void testInterruptedException4(){
102	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
103	<	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");
141	>	assertEquals(i-1,lock.getWriteHoldCount());
142		}
143		}
144
145	<
146	<	public void testTryLockWhenLocked() {
147	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
148	<	lock.writeLock().lock();
149	<	Thread t = new Thread(new Runnable() {
150	<	public void run(){
151	<	threadAssertFalse(lock.writeLock().tryLock());
152	<	}
129	<	});
130	<	try {
131	<	t.start();
132	<	t.join();
133	<	lock.writeLock().unlock();
134	<	} catch(Exception e){
135	<	fail("unexpected exception");
145	>	/**
146	>	* WriteLock.getHoldCount returns number of recursive holds
147	>	*/
148	>	public void testGetHoldCount() {
149	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
150	>	for (int i = 1; i <= SIZE; i++) {
151	>	lock.writeLock().lock();
152	>	assertEquals(i,lock.writeLock().getHoldCount());
153		}
154	<	}
138	<
139	<	public void testTryLockWhenLocked2() {
140	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
141	<	lock.writeLock().lock();
142	<	Thread t = new Thread(new Runnable() {
143	<	public void run(){
144	<	threadAssertFalse(lock.readLock().tryLock());
145	<	}
146	<	});
147	<	try {
148	<	t.start();
149	<	t.join();
154	>	for (int i = SIZE; i > 0; i--) {
155		lock.writeLock().unlock();
156	<	} catch(Exception e){
152	<	fail("unexpected exception");
156	>	assertEquals(i-1,lock.writeLock().getHoldCount());
157		}
158	<	}
158	>	}
159
160	<	public void testMultipleReadLocks() {
161	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
162	<	lock.readLock().lock();
163	<	Thread t = new Thread(new Runnable() {
164	<	public void run(){
165	<	threadAssertTrue(lock.readLock().tryLock());
166	<	lock.readLock().unlock();
167	<	}
164	<	});
165	<	try {
166	<	t.start();
167	<	t.join();
168	<	lock.readLock().unlock();
169	<	} catch(Exception e){
170	<	fail("unexpected exception");
160	>	/**
161	>	* getReadHoldCount returns number of recursive holds
162	>	*/
163	>	public void testGetReadHoldCount() {
164	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
165	>	for (int i = 1; i <= SIZE; i++) {
166	>	lock.readLock().lock();
167	>	assertEquals(i,lock.getReadHoldCount());
168		}
169	<	}
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);
169	>	for (int i = SIZE; i > 0; i--) {
170		lock.readLock().unlock();
171	<	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();
249	<	lock.readLock().unlock();
250	<	} catch(Exception e){
251	<	fail("unexpected exception");
171	>	assertEquals(i-1,lock.getReadHoldCount());
172		}
173	<	}
173	>	}
174
255	–
175
176	<	public void testWriteTryLockWhenReadLocked() {
177	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
178	<	lock.readLock().lock();
179	<	Thread t = new Thread(new Runnable() {
180	<	public void run(){
262	<	threadAssertFalse(lock.writeLock().tryLock());
263	<	}
264	<	});
176	>	/**
177	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
178	>	*/
179	>	public void testUnlock_IllegalMonitorStateException() {
180	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
181		try {
182	<	t.start();
183	<	t.join();
184	<	lock.readLock().unlock();
185	<	} catch(Exception e){
270	<	fail("unexpected exception");
271	<	}
272	<	}
182	>	rl.writeLock().unlock();
183	>	shouldThrow();
184	>	} catch (IllegalMonitorStateException success) {}
185	>	}
186
274	–
187
188	<	public void testTryLock_Timeout(){
189	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
190	<	lock.writeLock().lock();
191	<	Thread t = new Thread(new Runnable() {
192	<	public void run(){
193	<	try {
194	<	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
195	<	} catch (Exception ex) {
196	<	threadFail("unexpected exception");
197	<	}
198	<	}
199	<	});
200	<	try {
201	<	t.start();
202	<	t.join();
203	<	lock.writeLock().unlock();
204	<	} catch(Exception e){
205	<	fail("unexpected exception");
206	<	}
207	<	}
188	>	/**
189	>	* write-lockInterruptibly is interruptible
190	>	*/
191	>	public void testWriteLockInterruptibly_Interrupted() throws Exception {
192	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
193	>	lock.writeLock().lock();
194	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
195	>	public void realRun() throws InterruptedException {
196	>	lock.writeLock().lockInterruptibly();
197	>	lock.writeLock().unlock();
198	>	lock.writeLock().lockInterruptibly();
199	>	lock.writeLock().unlock();
200	>	}});
201	>
202	>	Thread.sleep(SHORT_DELAY_MS);
203	>	t.interrupt();
204	>	Thread.sleep(SHORT_DELAY_MS);
205	>	lock.writeLock().unlock();
206	>	t.join();
207	>	}
208
209	<	public void testTryLock_Timeout2(){
210	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
211	<	lock.writeLock().lock();
212	<	Thread t = new Thread(new Runnable() {
213	<	public void run(){
214	<	try {
215	<	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
216	<	} catch (Exception ex) {
217	<	threadFail("unexpected exception");
218	<	}
219	<	}
220	<	});
221	<	try {
222	<	t.start();
223	<	t.join();
224	<	lock.writeLock().unlock();
313	<	} catch(Exception e){
314	<	fail("unexpected exception");
315	<	}
316	<	}
209	>	/**
210	>	* timed write-tryLock is interruptible
211	>	*/
212	>	public void testWriteTryLock_Interrupted() throws InterruptedException {
213	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
214	>	lock.writeLock().lock();
215	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
216	>	public void realRun() throws InterruptedException {
217	>	lock.writeLock().tryLock(SMALL_DELAY_MS, MILLISECONDS);
218	>	}});
219	>
220	>	Thread.sleep(SHORT_DELAY_MS);
221	>	t.interrupt();
222	>	lock.writeLock().unlock();
223	>	t.join();
224	>	}
225
226	+	/**
227	+	* read-lockInterruptibly is interruptible
228	+	*/
229	+	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
230	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
231	+	lock.writeLock().lock();
232	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
233	+	public void realRun() throws InterruptedException {
234	+	lock.readLock().lockInterruptibly();
235	+	}});
236	+
237	+	Thread.sleep(SHORT_DELAY_MS);
238	+	t.interrupt();
239	+	Thread.sleep(SHORT_DELAY_MS);
240	+	lock.writeLock().unlock();
241	+	t.join();
242	+	}
243
244	<	public void testLockInterruptibly() {
245	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
246	<	try {
247	<	lock.writeLock().lockInterruptibly();
248	<	} catch(Exception e) {
249	<	fail("unexpected exception");
250	<	}
251	<	Thread t = new Thread(new Runnable() {
252	<	public void run() {
253	<	try {
254	<	lock.writeLock().lockInterruptibly();
255	<	threadFail("should throw");
256	<	}
257	<	catch(InterruptedException success) {
333	<	}
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	<	}
244	>	/**
245	>	* timed read-tryLock is interruptible
246	>	*/
247	>	public void testReadTryLock_Interrupted() throws InterruptedException {
248	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
249	>	lock.writeLock().lock();
250	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
251	>	public void realRun() throws InterruptedException {
252	>	lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS);
253	>	}});
254	>
255	>	Thread.sleep(SHORT_DELAY_MS);
256	>	t.interrupt();
257	>	t.join();
258		}
259
260	<	public void testLockInterruptibly2() {
261	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
262	<	try {
263	<	lock.writeLock().lockInterruptibly();
264	<	} catch(Exception e) {
265	<	fail("unexpected exception");
266	<	}
267	<	Thread t = new Thread(new Runnable() {
268	<	public void run() {
269	<	try {
270	<	lock.readLock().lockInterruptibly();
271	<	threadFail("should throw");
272	<	}
273	<	catch(InterruptedException success) {
274	<	}
275	<	}
276	<	});
277	<	try {
278	<	t.start();
279	<	t.interrupt();
280	<	t.join();
281	<	lock.writeLock().unlock();
282	<	} catch(Exception e){
283	<	fail("unexpected exception");
284	<	}
260	>
261	>	/**
262	>	* write-tryLock fails if locked
263	>	*/
264	>	public void testWriteTryLockWhenLocked() throws InterruptedException {
265	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
266	>	lock.writeLock().lock();
267	>	Thread t = newStartedThread(new CheckedRunnable() {
268	>	public void realRun() {
269	>	assertFalse(lock.writeLock().tryLock());
270	>	}});
271	>
272	>	t.join();
273	>	lock.writeLock().unlock();
274	>	}
275	>
276	>	/**
277	>	* read-tryLock fails if locked
278	>	*/
279	>	public void testReadTryLockWhenLocked() throws InterruptedException {
280	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
281	>	lock.writeLock().lock();
282	>	Thread t = newStartedThread(new CheckedRunnable() {
283	>	public void realRun() {
284	>	assertFalse(lock.readLock().tryLock());
285	>	}});
286	>
287	>	t.join();
288	>	lock.writeLock().unlock();
289	>	}
290	>
291	>	/**
292	>	* Multiple threads can hold a read lock when not write-locked
293	>	*/
294	>	public void testMultipleReadLocks() throws InterruptedException {
295	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
296	>	lock.readLock().lock();
297	>	Thread t = newStartedThread(new CheckedRunnable() {
298	>	public void realRun() {
299	>	assertTrue(lock.readLock().tryLock());
300	>	lock.readLock().unlock();
301	>	}});
302	>
303	>	t.join();
304	>	lock.readLock().unlock();
305	>	}
306	>
307	>	/**
308	>	* A writelock succeeds after reading threads unlock
309	>	*/
310	>	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
311	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
312	>	lock.readLock().lock();
313	>	Thread t1 = newStartedThread(new CheckedRunnable() {
314	>	public void realRun() {
315	>	lock.readLock().lock();
316	>	lock.readLock().unlock();
317	>	}});
318	>	Thread t2 = newStartedThread(new CheckedRunnable() {
319	>	public void realRun() {
320	>	lock.writeLock().lock();
321	>	lock.writeLock().unlock();
322	>	}});
323	>
324	>	Thread.sleep(SHORT_DELAY_MS);
325	>	lock.readLock().unlock();
326	>	t1.join(MEDIUM_DELAY_MS);
327	>	t2.join(MEDIUM_DELAY_MS);
328	>	assertTrue(!t1.isAlive());
329	>	assertTrue(!t2.isAlive());
330	>	}
331	>
332	>	/**
333	>	* Readlocks succeed after a writing thread unlocks
334	>	*/
335	>	public void testReadAfterWriteLock() throws InterruptedException {
336	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
337	>	lock.writeLock().lock();
338	>	Thread t1 = newStartedThread(new CheckedRunnable() {
339	>	public void realRun() {
340	>	lock.readLock().lock();
341	>	lock.readLock().unlock();
342	>	}});
343	>	Thread t2 = newStartedThread(new CheckedRunnable() {
344	>	public void realRun() {
345	>	lock.readLock().lock();
346	>	lock.readLock().unlock();
347	>	}});
348	>
349	>	Thread.sleep(SHORT_DELAY_MS);
350	>	lock.writeLock().unlock();
351	>	t1.join(MEDIUM_DELAY_MS);
352	>	t2.join(MEDIUM_DELAY_MS);
353	>	assertTrue(!t1.isAlive());
354	>	assertTrue(!t2.isAlive());
355	>	}
356	>
357	>	/**
358	>	* Read trylock succeeds if write locked by current thread
359	>	*/
360	>	public void testReadHoldingWriteLock() {
361	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
362	>	lock.writeLock().lock();
363	>	assertTrue(lock.readLock().tryLock());
364	>	lock.readLock().unlock();
365	>	lock.writeLock().unlock();
366	>	}
367	>
368	>	/**
369	>	* Read lock succeeds if write locked by current thread even if
370	>	* other threads are waiting for readlock
371	>	*/
372	>	public void testReadHoldingWriteLock2() throws InterruptedException {
373	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
374	>	lock.writeLock().lock();
375	>	Thread t1 = newStartedThread(new CheckedRunnable() {
376	>	public void realRun() {
377	>	lock.readLock().lock();
378	>	lock.readLock().unlock();
379	>	}});
380	>	Thread t2 = newStartedThread(new CheckedRunnable() {
381	>	public void realRun() {
382	>	lock.readLock().lock();
383	>	lock.readLock().unlock();
384	>	}});
385	>
386	>	lock.readLock().lock();
387	>	lock.readLock().unlock();
388	>	Thread.sleep(SHORT_DELAY_MS);
389	>	lock.readLock().lock();
390	>	lock.readLock().unlock();
391	>	lock.writeLock().unlock();
392	>	t1.join(MEDIUM_DELAY_MS);
393	>	t2.join(MEDIUM_DELAY_MS);
394	>	assertTrue(!t1.isAlive());
395	>	assertTrue(!t2.isAlive());
396	>	}
397	>
398	>	/**
399	>	* Read lock succeeds if write locked by current thread even if
400	>	* other threads are waiting for writelock
401	>	*/
402	>	public void testReadHoldingWriteLock3() throws InterruptedException {
403	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
404	>	lock.writeLock().lock();
405	>	Thread t1 = newStartedThread(new CheckedRunnable() {
406	>	public void realRun() {
407	>	lock.writeLock().lock();
408	>	lock.writeLock().unlock();
409	>	}});
410	>	Thread t2 = newStartedThread(new CheckedRunnable() {
411	>	public void realRun() {
412	>	lock.writeLock().lock();
413	>	lock.writeLock().unlock();
414	>	}});
415	>
416	>	lock.readLock().lock();
417	>	lock.readLock().unlock();
418	>	Thread.sleep(SHORT_DELAY_MS);
419	>	lock.readLock().lock();
420	>	lock.readLock().unlock();
421	>	lock.writeLock().unlock();
422	>	t1.join(MEDIUM_DELAY_MS);
423	>	t2.join(MEDIUM_DELAY_MS);
424	>	assertTrue(!t1.isAlive());
425	>	assertTrue(!t2.isAlive());
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	>	t1.join(MEDIUM_DELAY_MS);
454	>	t2.join(MEDIUM_DELAY_MS);
455	>	assertTrue(!t1.isAlive());
456	>	assertTrue(!t2.isAlive());
457	>	}
458	>
459	>
460	>	/**
461	>	* Fair Read trylock succeeds if write locked by current thread
462	>	*/
463	>	public void testReadHoldingWriteLockFair() {
464	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
465	>	lock.writeLock().lock();
466	>	assertTrue(lock.readLock().tryLock());
467	>	lock.readLock().unlock();
468	>	lock.writeLock().unlock();
469	>	}
470	>
471	>	/**
472	>	* Fair Read lock succeeds if write locked by current thread even if
473	>	* other threads are waiting for readlock
474	>	*/
475	>	public void testReadHoldingWriteLockFair2() throws InterruptedException {
476	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
477	>	lock.writeLock().lock();
478	>	Thread t1 = newStartedThread(new CheckedRunnable() {
479	>	public void realRun() {
480	>	lock.readLock().lock();
481	>	lock.readLock().unlock();
482	>	}});
483	>	Thread t2 = newStartedThread(new CheckedRunnable() {
484	>	public void realRun() {
485	>	lock.readLock().lock();
486	>	lock.readLock().unlock();
487	>	}});
488	>
489	>	lock.readLock().lock();
490	>	lock.readLock().unlock();
491	>	Thread.sleep(SHORT_DELAY_MS);
492	>	lock.readLock().lock();
493	>	lock.readLock().unlock();
494	>	lock.writeLock().unlock();
495	>	t1.join(MEDIUM_DELAY_MS);
496	>	t2.join(MEDIUM_DELAY_MS);
497	>	assertTrue(!t1.isAlive());
498	>	assertTrue(!t2.isAlive());
499	>	}
500	>
501	>
502	>	/**
503	>	* Fair Read lock succeeds if write locked by current thread even if
504	>	* other threads are waiting for writelock
505	>	*/
506	>	public void testReadHoldingWriteLockFair3() throws InterruptedException {
507	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
508	>	lock.writeLock().lock();
509	>	Thread t1 = newStartedThread(new CheckedRunnable() {
510	>	public void realRun() {
511	>	lock.writeLock().lock();
512	>	lock.writeLock().unlock();
513	>	}});
514	>	Thread t2 = newStartedThread(new CheckedRunnable() {
515	>	public void realRun() {
516	>	lock.writeLock().lock();
517	>	lock.writeLock().unlock();
518	>	}});
519	>
520	>	lock.readLock().lock();
521	>	lock.readLock().unlock();
522	>	Thread.sleep(SHORT_DELAY_MS);
523	>	lock.readLock().lock();
524	>	lock.readLock().unlock();
525	>	lock.writeLock().unlock();
526	>	t1.join(MEDIUM_DELAY_MS);
527	>	t2.join(MEDIUM_DELAY_MS);
528	>	assertTrue(!t1.isAlive());
529	>	assertTrue(!t2.isAlive());
530	>	}
531	>
532	>
533	>	/**
534	>	* Fair Write lock succeeds if write locked by current thread even if
535	>	* other threads are waiting for writelock
536	>	*/
537	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
538	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
539	>	lock.writeLock().lock();
540	>	Thread t1 = newStartedThread(new CheckedRunnable() {
541	>	public void realRun() {
542	>	lock.writeLock().lock();
543	>	lock.writeLock().unlock();
544	>	}});
545	>	Thread t2 = newStartedThread(new CheckedRunnable() {
546	>	public void realRun() {
547	>	lock.writeLock().lock();
548	>	lock.writeLock().unlock();
549	>	}});
550	>
551	>	Thread.sleep(SHORT_DELAY_MS);
552	>	assertTrue(lock.isWriteLockedByCurrentThread());
553	>	assertEquals(1, lock.getWriteHoldCount());
554	>	lock.writeLock().lock();
555	>	assertEquals(2, lock.getWriteHoldCount());
556	>	lock.writeLock().unlock();
557	>	lock.writeLock().lock();
558	>	lock.writeLock().unlock();
559	>	lock.writeLock().unlock();
560	>	t1.join(MEDIUM_DELAY_MS);
561	>	t2.join(MEDIUM_DELAY_MS);
562	>	assertTrue(!t1.isAlive());
563	>	assertTrue(!t2.isAlive());
564	>	}
565	>
566	>
567	>	/**
568	>	* Read tryLock succeeds if readlocked but not writelocked
569	>	*/
570	>	public void testTryLockWhenReadLocked() throws InterruptedException {
571	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
572	>	lock.readLock().lock();
573	>	Thread t = newStartedThread(new CheckedRunnable() {
574	>	public void realRun() {
575	>	assertTrue(lock.readLock().tryLock());
576	>	lock.readLock().unlock();
577	>	}});
578	>
579	>	t.join();
580	>	lock.readLock().unlock();
581	>	}
582	>
583	>	/**
584	>	* write tryLock fails when readlocked
585	>	*/
586	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
587	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
588	>	lock.readLock().lock();
589	>	Thread t = newStartedThread(new CheckedRunnable() {
590	>	public void realRun() {
591	>	assertFalse(lock.writeLock().tryLock());
592	>	}});
593	>
594	>	t.join();
595	>	lock.readLock().unlock();
596	>	}
597	>
598	>
599	>	/**
600	>	* Fair Read tryLock succeeds if readlocked but not writelocked
601	>	*/
602	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
603	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
604	>	lock.readLock().lock();
605	>	Thread t = newStartedThread(new CheckedRunnable() {
606	>	public void realRun() {
607	>	assertTrue(lock.readLock().tryLock());
608	>	lock.readLock().unlock();
609	>	}});
610	>
611	>	t.join();
612	>	lock.readLock().unlock();
613	>	}
614	>
615	>
616	>
617	>	/**
618	>	* Fair write tryLock fails when readlocked
619	>	*/
620	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
621	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
622	>	lock.readLock().lock();
623	>	Thread t = newStartedThread(new CheckedRunnable() {
624	>	public void realRun() {
625	>	assertFalse(lock.writeLock().tryLock());
626	>	}});
627	>
628	>	t.join();
629	>	lock.readLock().unlock();
630	>	}
631	>
632	>
633	>
634	>	/**
635	>	* write timed tryLock times out if locked
636	>	*/
637	>	public void testWriteTryLock_Timeout() throws InterruptedException {
638	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
639	>	lock.writeLock().lock();
640	>	Thread t = newStartedThread(new CheckedRunnable() {
641	>	public void realRun() throws InterruptedException {
642	>	assertFalse(lock.writeLock().tryLock(1, MILLISECONDS));
643	>	}});
644	>
645	>	t.join();
646	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
647	>	lock.writeLock().unlock();
648	>	}
649	>
650	>	/**
651	>	* read timed tryLock times out if write-locked
652	>	*/
653	>	public void testReadTryLock_Timeout() throws InterruptedException {
654	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
655	>	lock.writeLock().lock();
656	>	Thread t = newStartedThread(new CheckedRunnable() {
657	>	public void realRun() throws InterruptedException {
658	>	assertFalse(lock.readLock().tryLock(1, MILLISECONDS));
659	>	}});
660	>
661	>	t.join();
662	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
663	>	lock.writeLock().unlock();
664	>	}
665	>
666	>
667	>	/**
668	>	* write lockInterruptibly succeeds if lock free else is interruptible
669	>	*/
670	>	public void testWriteLockInterruptibly() throws InterruptedException {
671	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
672	>	lock.writeLock().lockInterruptibly();
673	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
674	>	public void realRun() throws InterruptedException {
675	>	lock.writeLock().lockInterruptibly();
676	>	}});
677	>
678	>	Thread.sleep(SHORT_DELAY_MS);
679	>	t.interrupt();
680	>	Thread.sleep(SHORT_DELAY_MS);
681	>	t.join();
682	>	lock.writeLock().unlock();
683	>	}
684	>
685	>	/**
686	>	* read lockInterruptibly succeeds if lock free else is interruptible
687	>	*/
688	>	public void testReadLockInterruptibly() throws InterruptedException {
689	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
690	>	lock.writeLock().lockInterruptibly();
691	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
692	>	public void realRun() throws InterruptedException {
693	>	lock.readLock().lockInterruptibly();
694	>	}});
695	>
696	>	Thread.sleep(SHORT_DELAY_MS);
697	>	t.interrupt();
698	>	t.join();
699	>	lock.writeLock().unlock();
700		}
701
702	<	public void testAwait_IllegalMonitor() {
703	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
702	>	/**
703	>	* Calling await without holding lock throws IllegalMonitorStateException
704	>	*/
705	>	public void testAwait_IllegalMonitor() throws InterruptedException {
706	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
707		final Condition c = lock.writeLock().newCondition();
708		try {
709		c.await();
710	<	fail("should throw");
711	<	}
380	<	catch (IllegalMonitorStateException success) {
381	<	}
382	<	catch (Exception ex) {
383	<	fail("should throw IMSE");
384	<	}
710	>	shouldThrow();
711	>	} catch (IllegalMonitorStateException success) {}
712		}
713
714	+	/**
715	+	* Calling signal without holding lock throws IllegalMonitorStateException
716	+	*/
717		public void testSignal_IllegalMonitor() {
718	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
718	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
719		final Condition c = lock.writeLock().newCondition();
720		try {
721		c.signal();
722	<	fail("should throw");
723	<	}
394	<	catch (IllegalMonitorStateException success) {
395	<	}
396	<	catch (Exception ex) {
397	<	fail("should throw IMSE");
398	<	}
722	>	shouldThrow();
723	>	} catch (IllegalMonitorStateException success) {}
724		}
725
726	<	public void testAwaitNanos_Timeout() {
727	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
726	>	/**
727	>	* awaitNanos without a signal times out
728	>	*/
729	>	public void testAwaitNanos_Timeout() throws InterruptedException {
730	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
731		final Condition c = lock.writeLock().newCondition();
732	<	try {
733	<	lock.writeLock().lock();
734	<	long t = c.awaitNanos(100);
735	<	assertTrue(t <= 0);
736	<	lock.writeLock().unlock();
409	<	}
410	<	catch (Exception ex) {
411	<	fail("unexpected exception");
412	<	}
732	>
733	>	lock.writeLock().lock();
734	>	long t = c.awaitNanos(100);
735	>	assertTrue(t <= 0);
736	>	lock.writeLock().unlock();
737		}
738
739	<	public void testAwait_Timeout() {
740	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
739	>
740	>	/**
741	>	* timed await without a signal times out
742	>	*/
743	>	public void testAwait_Timeout() throws InterruptedException {
744	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
745		final Condition c = lock.writeLock().newCondition();
746	<	try {
747	<	lock.writeLock().lock();
748	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
421	<	lock.writeLock().unlock();
422	<	}
423	<	catch (Exception ex) {
424	<	fail("unexpected exception");
425	<	}
746	>	lock.writeLock().lock();
747	>	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
748	>	lock.writeLock().unlock();
749		}
750
751	<	public void testAwaitUntil_Timeout() {
752	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
751	>	/**
752	>	* awaitUntil without a signal times out
753	>	*/
754	>	public void testAwaitUntil_Timeout() throws InterruptedException {
755	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
756		final Condition c = lock.writeLock().newCondition();
757	<	try {
758	<	lock.writeLock().lock();
759	<	java.util.Date d = new java.util.Date();
760	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
435	<	lock.writeLock().unlock();
436	<	}
437	<	catch (Exception ex) {
438	<	fail("unexpected exception");
439	<	}
757	>	lock.writeLock().lock();
758	>	java.util.Date d = new java.util.Date();
759	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
760	>	lock.writeLock().unlock();
761		}
762
763	<	public void testAwait() {
764	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
763	>	/**
764	>	* await returns when signalled
765	>	*/
766	>	public void testAwait() throws InterruptedException {
767	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
768		final Condition c = lock.writeLock().newCondition();
769	<	Thread t = new Thread(new Runnable() {
770	<	public void run() {
771	<	try {
772	<	lock.writeLock().lock();
773	<	c.await();
774	<	lock.writeLock().unlock();
775	<	}
776	<	catch(InterruptedException e) {
777	<	threadFail("unexpected exception");
778	<	}
779	<	}
780	<	});
769	>	Thread t = newStartedThread(new CheckedRunnable() {
770	>	public void realRun() throws InterruptedException {
771	>	lock.writeLock().lock();
772	>	c.await();
773	>	lock.writeLock().unlock();
774	>	}});
775	>
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
784	<	try {
785	<	t.start();
786	<	Thread.sleep(SHORT_DELAY_MS);
787	<	lock.writeLock().lock();
788	<	c.signal();
789	<	lock.writeLock().unlock();
790	<	t.join(SHORT_DELAY_MS);
791	<	assertFalse(t.isAlive());
792	<	}
793	<	catch (Exception ex) {
794	<	fail("unexpected exception");
784	>	/** A helper class for uninterruptible wait tests */
785	>	class UninterruptableThread extends Thread {
786	>	private Lock lock;
787	>	private Condition c;
788	>
789	>	public volatile boolean canAwake = false;
790	>	public volatile boolean interrupted = false;
791	>	public volatile boolean lockStarted = false;
792	>
793	>	public UninterruptableThread(Lock lock, Condition c) {
794	>	this.lock = lock;
795	>	this.c = c;
796	>	}
797	>
798	>	public synchronized void run() {
799	>	lock.lock();
800	>	lockStarted = true;
801	>
802	>	while (!canAwake) {
803	>	c.awaitUninterruptibly();
804	>	}
805	>
806	>	interrupted = isInterrupted();
807	>	lock.unlock();
808		}
809		}
810
811	<	public void testAwaitUninterruptibly() {
812	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
811	>	/**
812	>	* awaitUninterruptibly doesn't abort on interrupt
813	>	*/
814	>	public void testAwaitUninterruptibly() throws InterruptedException {
815	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
816		final Condition c = lock.writeLock().newCondition();
817	<	Thread t = new Thread(new Runnable() {
476	<	public void run() {
477	<	lock.writeLock().lock();
478	<	c.awaitUninterruptibly();
479	<	lock.writeLock().unlock();
480	<	}
481	<	});
817	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
818
819	+	thread.start();
820	+
821	+	while (!thread.lockStarted) {
822	+	Thread.sleep(100);
823	+	}
824	+
825	+	lock.writeLock().lock();
826		try {
827	<	t.start();
828	<	Thread.sleep(SHORT_DELAY_MS);
486	<	t.interrupt();
487	<	lock.writeLock().lock();
827	>	thread.interrupt();
828	>	thread.canAwake = true;
829		c.signal();
830	+	} finally {
831		lock.writeLock().unlock();
490	–	t.join(SHORT_DELAY_MS);
491	–	assertFalse(t.isAlive());
492	–	}
493	–	catch (Exception ex) {
494	–	fail("unexpected exception");
832		}
833	+
834	+	thread.join();
835	+	assertTrue(thread.interrupted);
836	+	assertFalse(thread.isAlive());
837		}
838
839	<	public void testAwait_Interrupt() {
840	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
841	<	final Condition c = lock.writeLock().newCondition();
842	<	Thread t = new Thread(new Runnable() {
843	<	public void run() {
844	<	try {
845	<	lock.writeLock().lock();
846	<	c.await();
847	<	lock.writeLock().unlock();
848	<	threadFail("should throw");
849	<	}
850	<	catch(InterruptedException success) {
851	<	}
852	<	}
853	<	});
854	<
855	<	try {
856	<	t.start();
857	<	Thread.sleep(SHORT_DELAY_MS);
858	<	t.interrupt();
859	<	t.join(SHORT_DELAY_MS);
860	<	assertFalse(t.isAlive());
861	<	}
862	<	catch (Exception ex) {
863	<	fail("unexpected exception");
864	<	}
865	<	}
866	<
867	<	public void testAwaitNanos_Interrupt() {
868	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
869	<	final Condition c = lock.writeLock().newCondition();
870	<	Thread t = new Thread(new Runnable() {
871	<	public void run() {
872	<	try {
873	<	lock.writeLock().lock();
874	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
875	<	lock.writeLock().unlock();
876	<	threadFail("should throw");
877	<	}
878	<	catch(InterruptedException success) {
879	<	}
880	<	}
881	<	});
882	<
883	<	try {
884	<	t.start();
885	<	Thread.sleep(SHORT_DELAY_MS);
886	<	t.interrupt();
887	<	t.join(SHORT_DELAY_MS);
888	<	assertFalse(t.isAlive());
889	<	}
890	<	catch (Exception ex) {
891	<	fail("unexpected exception");
892	<	}
893	<	}
894	<
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	<	}
839	>	/**
840	>	* await is interruptible
841	>	*/
842	>	public void testAwait_Interrupt() throws InterruptedException {
843	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
844	>	final Condition c = lock.writeLock().newCondition();
845	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
846	>	public void realRun() throws InterruptedException {
847	>	lock.writeLock().lock();
848	>	c.await();
849	>	lock.writeLock().unlock();
850	>	}});
851	>
852	>	Thread.sleep(SHORT_DELAY_MS);
853	>	t.interrupt();
854	>	t.join(SHORT_DELAY_MS);
855	>	assertFalse(t.isAlive());
856	>	}
857	>
858	>	/**
859	>	* awaitNanos is interruptible
860	>	*/
861	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
862	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
863	>	final Condition c = lock.writeLock().newCondition();
864	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
865	>	public void realRun() throws InterruptedException {
866	>	lock.writeLock().lock();
867	>	c.awaitNanos(MILLISECONDS.toNanos(LONG_DELAY_MS));
868	>	lock.writeLock().unlock();
869	>	}});
870	>
871	>	Thread.sleep(SHORT_DELAY_MS);
872	>	t.interrupt();
873	>	t.join(SHORT_DELAY_MS);
874	>	assertFalse(t.isAlive());
875	>	}
876	>
877	>	/**
878	>	* awaitUntil is interruptible
879	>	*/
880	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
881	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
882	>	final Condition c = lock.writeLock().newCondition();
883	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
884	>	public void realRun() throws InterruptedException {
885	>	lock.writeLock().lock();
886	>	java.util.Date d = new java.util.Date();
887	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
888	>	lock.writeLock().unlock();
889	>	}});
890	>
891	>	Thread.sleep(SHORT_DELAY_MS);
892	>	t.interrupt();
893	>	t.join(SHORT_DELAY_MS);
894	>	assertFalse(t.isAlive());
895		}
896
897	<	public void testSerialization() {
897	>	/**
898	>	* signalAll wakes up all threads
899	>	*/
900	>	public void testSignalAll() throws InterruptedException {
901	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
902	>	final Condition c = lock.writeLock().newCondition();
903	>	Thread t1 = newStartedThread(new CheckedRunnable() {
904	>	public void realRun() throws InterruptedException {
905	>	lock.writeLock().lock();
906	>	c.await();
907	>	lock.writeLock().unlock();
908	>	}});
909	>
910	>	Thread t2 = newStartedThread(new CheckedRunnable() {
911	>	public void realRun() throws InterruptedException {
912	>	lock.writeLock().lock();
913	>	c.await();
914	>	lock.writeLock().unlock();
915	>	}});
916	>
917	>	Thread.sleep(SHORT_DELAY_MS);
918	>	lock.writeLock().lock();
919	>	c.signalAll();
920	>	lock.writeLock().unlock();
921	>	t1.join(SHORT_DELAY_MS);
922	>	t2.join(SHORT_DELAY_MS);
923	>	assertFalse(t1.isAlive());
924	>	assertFalse(t2.isAlive());
925	>	}
926	>
927	>	/**
928	>	* A serialized lock deserializes as unlocked
929	>	*/
930	>	public void testSerialization() throws Exception {
931		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
932		l.readLock().lock();
933		l.readLock().unlock();
934
935	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
936	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
937	+	out.writeObject(l);
938	+	out.close();
939	+
940	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
941	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
942	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
943	+	r.readLock().lock();
944	+	r.readLock().unlock();
945	+	}
946	+
947	+	/**
948	+	* hasQueuedThreads reports whether there are waiting threads
949	+	*/
950	+	public void testhasQueuedThreads() throws InterruptedException {
951	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
952	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
953	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
954	+	assertFalse(lock.hasQueuedThreads());
955	+	lock.writeLock().lock();
956	+	t1.start();
957	+	Thread.sleep(SHORT_DELAY_MS);
958	+	assertTrue(lock.hasQueuedThreads());
959	+	t2.start();
960	+	Thread.sleep(SHORT_DELAY_MS);
961	+	assertTrue(lock.hasQueuedThreads());
962	+	t1.interrupt();
963	+	Thread.sleep(SHORT_DELAY_MS);
964	+	assertTrue(lock.hasQueuedThreads());
965	+	lock.writeLock().unlock();
966	+	Thread.sleep(SHORT_DELAY_MS);
967	+	assertFalse(lock.hasQueuedThreads());
968	+	t1.join();
969	+	t2.join();
970	+	}
971	+
972	+	/**
973	+	* hasQueuedThread(null) throws NPE
974	+	*/
975	+	public void testHasQueuedThreadNPE() {
976	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
977		try {
978	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
979	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
980	<	out.writeObject(l);
981	<	out.close();
982	<
983	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
984	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
985	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
986	<	r.readLock().lock();
987	<	r.readLock().unlock();
988	<	} catch(Exception e){
989	<	e.printStackTrace();
990	<	fail("unexpected exception");
991	<	}
978	>	sync.hasQueuedThread(null);
979	>	shouldThrow();
980	>	} catch (NullPointerException success) {}
981	>	}
982	>
983	>	/**
984	>	* hasQueuedThread reports whether a thread is queued.
985	>	*/
986	>	public void testHasQueuedThread() throws InterruptedException {
987	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
988	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
989	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
990	>	assertFalse(sync.hasQueuedThread(t1));
991	>	assertFalse(sync.hasQueuedThread(t2));
992	>	sync.writeLock().lock();
993	>	t1.start();
994	>	Thread.sleep(SHORT_DELAY_MS);
995	>	assertTrue(sync.hasQueuedThread(t1));
996	>	t2.start();
997	>	Thread.sleep(SHORT_DELAY_MS);
998	>	assertTrue(sync.hasQueuedThread(t1));
999	>	assertTrue(sync.hasQueuedThread(t2));
1000	>	t1.interrupt();
1001	>	Thread.sleep(SHORT_DELAY_MS);
1002	>	assertFalse(sync.hasQueuedThread(t1));
1003	>	assertTrue(sync.hasQueuedThread(t2));
1004	>	sync.writeLock().unlock();
1005	>	Thread.sleep(SHORT_DELAY_MS);
1006	>	assertFalse(sync.hasQueuedThread(t1));
1007	>	Thread.sleep(SHORT_DELAY_MS);
1008	>	assertFalse(sync.hasQueuedThread(t2));
1009	>	t1.join();
1010	>	t2.join();
1011	>	}
1012	>
1013	>
1014	>	/**
1015	>	* getQueueLength reports number of waiting threads
1016	>	*/
1017	>	public void testGetQueueLength() throws InterruptedException {
1018	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1019	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1020	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1021	>	assertEquals(0, lock.getQueueLength());
1022	>	lock.writeLock().lock();
1023	>	t1.start();
1024	>	Thread.sleep(SHORT_DELAY_MS);
1025	>	assertEquals(1, lock.getQueueLength());
1026	>	t2.start();
1027	>	Thread.sleep(SHORT_DELAY_MS);
1028	>	assertEquals(2, lock.getQueueLength());
1029	>	t1.interrupt();
1030	>	Thread.sleep(SHORT_DELAY_MS);
1031	>	assertEquals(1, lock.getQueueLength());
1032	>	lock.writeLock().unlock();
1033	>	Thread.sleep(SHORT_DELAY_MS);
1034	>	assertEquals(0, lock.getQueueLength());
1035	>	t1.join();
1036	>	t2.join();
1037	>	}
1038	>
1039	>	/**
1040	>	* getQueuedThreads includes waiting threads
1041	>	*/
1042	>	public void testGetQueuedThreads() throws InterruptedException {
1043	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1044	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1045	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1046	>	assertTrue(lock.getQueuedThreads().isEmpty());
1047	>	lock.writeLock().lock();
1048	>	assertTrue(lock.getQueuedThreads().isEmpty());
1049	>	t1.start();
1050	>	Thread.sleep(SHORT_DELAY_MS);
1051	>	assertTrue(lock.getQueuedThreads().contains(t1));
1052	>	t2.start();
1053	>	Thread.sleep(SHORT_DELAY_MS);
1054	>	assertTrue(lock.getQueuedThreads().contains(t1));
1055	>	assertTrue(lock.getQueuedThreads().contains(t2));
1056	>	t1.interrupt();
1057	>	Thread.sleep(SHORT_DELAY_MS);
1058	>	assertFalse(lock.getQueuedThreads().contains(t1));
1059	>	assertTrue(lock.getQueuedThreads().contains(t2));
1060	>	lock.writeLock().unlock();
1061	>	Thread.sleep(SHORT_DELAY_MS);
1062	>	assertTrue(lock.getQueuedThreads().isEmpty());
1063	>	t1.join();
1064	>	t2.join();
1065	>	}
1066	>
1067	>	/**
1068	>	* hasWaiters throws NPE if null
1069	>	*/
1070	>	public void testHasWaitersNPE() {
1071	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1072	>	try {
1073	>	lock.hasWaiters(null);
1074	>	shouldThrow();
1075	>	} catch (NullPointerException success) {}
1076	>	}
1077	>
1078	>	/**
1079	>	* getWaitQueueLength throws NPE if null
1080	>	*/
1081	>	public void testGetWaitQueueLengthNPE() {
1082	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1083	>	try {
1084	>	lock.getWaitQueueLength(null);
1085	>	shouldThrow();
1086	>	} catch (NullPointerException success) {}
1087	>	}
1088	>
1089	>
1090	>	/**
1091	>	* getWaitingThreads throws NPE if null
1092	>	*/
1093	>	public void testGetWaitingThreadsNPE() {
1094	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1095	>	try {
1096	>	lock.getWaitingThreads(null);
1097	>	shouldThrow();
1098	>	} catch (NullPointerException success) {}
1099		}
1100
1101	+	/**
1102	+	* hasWaiters throws IAE if not owned
1103	+	*/
1104	+	public void testHasWaitersIAE() {
1105	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1106	+	final Condition c = lock.writeLock().newCondition();
1107	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1108	+	try {
1109	+	lock2.hasWaiters(c);
1110	+	shouldThrow();
1111	+	} catch (IllegalArgumentException success) {}
1112	+	}
1113	+
1114	+	/**
1115	+	* hasWaiters throws IMSE if not locked
1116	+	*/
1117	+	public void testHasWaitersIMSE() {
1118	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1119	+	final Condition c = lock.writeLock().newCondition();
1120	+	try {
1121	+	lock.hasWaiters(c);
1122	+	shouldThrow();
1123	+	} catch (IllegalMonitorStateException success) {}
1124	+	}
1125	+
1126	+
1127	+	/**
1128	+	* getWaitQueueLength throws IAE if not owned
1129	+	*/
1130	+	public void testGetWaitQueueLengthIAE() {
1131	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1132	+	final Condition c = lock.writeLock().newCondition();
1133	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1134	+	try {
1135	+	lock2.getWaitQueueLength(c);
1136	+	shouldThrow();
1137	+	} catch (IllegalArgumentException success) {}
1138	+	}
1139	+
1140	+	/**
1141	+	* getWaitQueueLength throws IMSE if not locked
1142	+	*/
1143	+	public void testGetWaitQueueLengthIMSE() {
1144	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1145	+	final Condition c = lock.writeLock().newCondition();
1146	+	try {
1147	+	lock.getWaitQueueLength(c);
1148	+	shouldThrow();
1149	+	} catch (IllegalMonitorStateException success) {}
1150	+	}
1151	+
1152	+
1153	+	/**
1154	+	* getWaitingThreads throws IAE if not owned
1155	+	*/
1156	+	public void testGetWaitingThreadsIAE() {
1157	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1158	+	final Condition c = lock.writeLock().newCondition();
1159	+	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1160	+	try {
1161	+	lock2.getWaitingThreads(c);
1162	+	shouldThrow();
1163	+	} catch (IllegalArgumentException success) {}
1164	+	}
1165	+
1166	+	/**
1167	+	* getWaitingThreads throws IMSE if not locked
1168	+	*/
1169	+	public void testGetWaitingThreadsIMSE() {
1170	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1171	+	final Condition c = lock.writeLock().newCondition();
1172	+	try {
1173	+	lock.getWaitingThreads(c);
1174	+	shouldThrow();
1175	+	} catch (IllegalMonitorStateException success) {}
1176	+	}
1177	+
1178	+
1179	+	/**
1180	+	* hasWaiters returns true when a thread is waiting, else false
1181	+	*/
1182	+	public void testHasWaiters() throws InterruptedException {
1183	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1184	+	final Condition c = lock.writeLock().newCondition();
1185	+	Thread t = newStartedThread(new CheckedRunnable() {
1186	+	public void realRun() throws InterruptedException {
1187	+	lock.writeLock().lock();
1188	+	assertFalse(lock.hasWaiters(c));
1189	+	assertEquals(0, lock.getWaitQueueLength(c));
1190	+	c.await();
1191	+	lock.writeLock().unlock();
1192	+	}});
1193	+
1194	+	Thread.sleep(SHORT_DELAY_MS);
1195	+	lock.writeLock().lock();
1196	+	assertTrue(lock.hasWaiters(c));
1197	+	assertEquals(1, lock.getWaitQueueLength(c));
1198	+	c.signal();
1199	+	lock.writeLock().unlock();
1200	+	Thread.sleep(SHORT_DELAY_MS);
1201	+	lock.writeLock().lock();
1202	+	assertFalse(lock.hasWaiters(c));
1203	+	assertEquals(0, lock.getWaitQueueLength(c));
1204	+	lock.writeLock().unlock();
1205	+	t.join(SHORT_DELAY_MS);
1206	+	assertFalse(t.isAlive());
1207	+	}
1208	+
1209	+	/**
1210	+	* getWaitQueueLength returns number of waiting threads
1211	+	*/
1212	+	public void testGetWaitQueueLength() throws InterruptedException {
1213	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1214	+	final Condition c = lock.writeLock().newCondition();
1215	+	Thread t = newStartedThread(new CheckedRunnable() {
1216	+	public void realRun() throws InterruptedException {
1217	+	lock.writeLock().lock();
1218	+	assertFalse(lock.hasWaiters(c));
1219	+	assertEquals(0, lock.getWaitQueueLength(c));
1220	+	c.await();
1221	+	lock.writeLock().unlock();
1222	+	}});
1223	+
1224	+	Thread.sleep(SHORT_DELAY_MS);
1225	+	lock.writeLock().lock();
1226	+	assertTrue(lock.hasWaiters(c));
1227	+	assertEquals(1, lock.getWaitQueueLength(c));
1228	+	c.signal();
1229	+	lock.writeLock().unlock();
1230	+	Thread.sleep(SHORT_DELAY_MS);
1231	+	lock.writeLock().lock();
1232	+	assertFalse(lock.hasWaiters(c));
1233	+	assertEquals(0, lock.getWaitQueueLength(c));
1234	+	lock.writeLock().unlock();
1235	+	t.join(SHORT_DELAY_MS);
1236	+	assertFalse(t.isAlive());
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	+	t1.join(SHORT_DELAY_MS);
1281	+	t2.join(SHORT_DELAY_MS);
1282	+	assertFalse(t1.isAlive());
1283	+	assertFalse(t2.isAlive());
1284	+	}
1285	+
1286	+	/**
1287	+	* toString indicates current lock state
1288	+	*/
1289	+	public void testToString() {
1290	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1291	+	String us = lock.toString();
1292	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1293	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1294	+	lock.writeLock().lock();
1295	+	String ws = lock.toString();
1296	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1297	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1298	+	lock.writeLock().unlock();
1299	+	lock.readLock().lock();
1300	+	lock.readLock().lock();
1301	+	String rs = lock.toString();
1302	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1303	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1304	+	}
1305	+
1306	+	/**
1307	+	* readLock.toString indicates current lock state
1308	+	*/
1309	+	public void testReadLockToString() {
1310	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1311	+	String us = lock.readLock().toString();
1312	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1313	+	lock.readLock().lock();
1314	+	lock.readLock().lock();
1315	+	String rs = lock.readLock().toString();
1316	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1317	+	}
1318	+
1319	+	/**
1320	+	* writeLock.toString indicates current lock state
1321	+	*/
1322	+	public void testWriteLockToString() {
1323	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1324	+	String us = lock.writeLock().toString();
1325	+	assertTrue(us.indexOf("Unlocked") >= 0);
1326	+	lock.writeLock().lock();
1327	+	String ls = lock.writeLock().toString();
1328	+	assertTrue(ls.indexOf("Locked") >= 0);
1329	+	}
1330
1331		}

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