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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.2 by dl, Sun Sep 7 20:39:11 2003 UTC vs.
Revision 1.37 by jsr166, Sat Nov 21 10:25:05 2009 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
2	>	* Written by Doug Lea with assistance from members of JCP JSR-166
3	>	* Expert Group and released to the public domain, as explained at
4	>	* http://creativecommons.org/licenses/publicdomain
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9		import junit.framework.*;
10		import java.util.concurrent.locks.*;
11		import java.util.concurrent.*;
12	+	import static java.util.concurrent.TimeUnit.MILLISECONDS;
13		import java.io.*;
14	+	import java.util.*;
15
16	<	public class ReentrantReadWriteLockTest extends TestCase {
14	<	static int HOLD_COUNT_TEST_LIMIT = 20;
15	<
16	>	public class ReentrantReadWriteLockTest extends JSR166TestCase {
17		public static void main(String[] args) {
18	<	junit.textui.TestRunner.run (suite());
18	>	junit.textui.TestRunner.run (suite());
19		}
19	–
20		public static Test suite() {
21	<	return new TestSuite(ReentrantReadWriteLockTest.class);
21	>	return new TestSuite(ReentrantReadWriteLockTest.class);
22		}
23
24	+	/**
25	+	* A runnable calling lockInterruptibly
26	+	*/
27	+	class InterruptibleLockRunnable extends CheckedRunnable {
28	+	final ReentrantReadWriteLock lock;
29	+	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
30	+	public void realRun() throws InterruptedException {
31	+	lock.writeLock().lockInterruptibly();
32	+	}
33	+	}
34
25	–	private static long SHORT_DELAY_MS = 100;
26	–	private static long MEDIUM_DELAY_MS = 1000;
27	–	private static long LONG_DELAY_MS = 10000;
35
36	<	/*
37	<	* Unlocks an unlocked lock, throws Illegal Monitor State
38	<	*
36	>	/**
37	>	* A runnable calling lockInterruptibly that expects to be
38	>	* interrupted
39		*/
40	<
41	<	public void testIllegalMonitorStateException(){
42	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
43	<	try{
44	<	rl.writeLock().unlock();
45	<	fail("Should of thown Illegal Monitor State Exception");
40	>	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
41	>	final ReentrantReadWriteLock lock;
42	>	InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
43	>	public void realRun() throws InterruptedException {
44	>	lock.writeLock().lockInterruptibly();
45	>	}
46	>	}
47
48	<	}catch(IllegalMonitorStateException success){}
48	>	/**
49	>	* Subclass to expose protected methods
50	>	*/
51	>	static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
52	>	PublicReentrantReadWriteLock() { super(); }
53	>	public Collection<Thread> getQueuedThreads() {
54	>	return super.getQueuedThreads();
55	>	}
56	>	public Collection<Thread> getWaitingThreads(Condition c) {
57	>	return super.getWaitingThreads(c);
58	>	}
59		}
60
61	+	/**
62	+	* Constructor sets given fairness, and is in unlocked state
63	+	*/
64	+	public void testConstructor() {
65	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
66	+	assertFalse(rl.isFair());
67	+	assertFalse(rl.isWriteLocked());
68	+	assertEquals(0, rl.getReadLockCount());
69	+	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
70	+	assertTrue(r2.isFair());
71	+	assertFalse(r2.isWriteLocked());
72	+	assertEquals(0, r2.getReadLockCount());
73	+	ReentrantReadWriteLock r3 = new ReentrantReadWriteLock(false);
74	+	assertFalse(r3.isFair());
75	+	assertFalse(r3.isWriteLocked());
76	+	assertEquals(0, r3.getReadLockCount());
77	+	}
78
79	+	/**
80	+	* write-locking and read-locking an unlocked lock succeed
81	+	*/
82	+	public void testLock() {
83	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
84	+	rl.writeLock().lock();
85	+	assertTrue(rl.isWriteLocked());
86	+	assertTrue(rl.isWriteLockedByCurrentThread());
87	+	assertTrue(rl.writeLock().isHeldByCurrentThread());
88	+	assertEquals(0, rl.getReadLockCount());
89	+	rl.writeLock().unlock();
90	+	assertFalse(rl.isWriteLocked());
91	+	assertFalse(rl.isWriteLockedByCurrentThread());
92	+	assertFalse(rl.writeLock().isHeldByCurrentThread());
93	+	assertEquals(0, rl.getReadLockCount());
94	+	rl.readLock().lock();
95	+	assertFalse(rl.isWriteLocked());
96	+	assertFalse(rl.isWriteLockedByCurrentThread());
97	+	assertEquals(1, rl.getReadLockCount());
98	+	rl.readLock().unlock();
99	+	assertFalse(rl.isWriteLocked());
100	+	assertFalse(rl.isWriteLockedByCurrentThread());
101	+	assertEquals(0, rl.getReadLockCount());
102	+	}
103
104	<	public void testInterruptedException(){
105	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
106	<	lock.writeLock().lock();
107	<	Thread t = new Thread(new Runnable() {
108	<	public void run(){
109	<	try{
110	<	lock.writeLock().lockInterruptibly();
111	<	fail("should throw");
112	<	}catch(InterruptedException success){}
113	<	}
114	<	});
115	<	try {
116	<	t.start();
117	<	t.interrupt();
118	<	lock.writeLock().unlock();
119	<	t.join();
120	<	} catch(Exception e){
121	<	fail("unexpected exception");
122	<	}
123	<	}
124	<
125	<	public void testInterruptedException2(){
126	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
127	<	lock.writeLock().lock();
69	<	Thread t = new Thread(new Runnable() {
70	<	public void run(){
71	<	try{
72	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
73	<	fail("should throw");
74	<	}catch(InterruptedException success){}
75	<	}
76	<	});
77	<	try {
78	<	t.start();
79	<	t.interrupt();
80	<	lock.writeLock().unlock();
81	<	t.join();
82	<	} catch(Exception e){
83	<	fail("unexpected exception");
84	<	}
104	>
105	>	/**
106	>	* locking an unlocked fair lock succeeds
107	>	*/
108	>	public void testFairLock() {
109	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
110	>	rl.writeLock().lock();
111	>	assertTrue(rl.isWriteLocked());
112	>	assertTrue(rl.isWriteLockedByCurrentThread());
113	>	assertTrue(rl.writeLock().isHeldByCurrentThread());
114	>	assertEquals(0, rl.getReadLockCount());
115	>	rl.writeLock().unlock();
116	>	assertFalse(rl.isWriteLocked());
117	>	assertFalse(rl.isWriteLockedByCurrentThread());
118	>	assertFalse(rl.writeLock().isHeldByCurrentThread());
119	>	assertEquals(0, rl.getReadLockCount());
120	>	rl.readLock().lock();
121	>	assertFalse(rl.isWriteLocked());
122	>	assertFalse(rl.isWriteLockedByCurrentThread());
123	>	assertEquals(1, rl.getReadLockCount());
124	>	rl.readLock().unlock();
125	>	assertFalse(rl.isWriteLocked());
126	>	assertFalse(rl.isWriteLockedByCurrentThread());
127	>	assertEquals(0, rl.getReadLockCount());
128		}
129
130	<	public void testInterruptedException3(){
131	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
132	<	lock.writeLock().lock();
133	<	Thread t = new Thread(new Runnable() {
134	<	public void run(){
135	<	try{
136	<	lock.readLock().lockInterruptibly();
137	<	fail("should throw");
138	<	}catch(InterruptedException success){}
139	<	}
97	<	});
98	<	try {
99	<	t.start();
100	<	t.interrupt();
130	>	/**
131	>	* getWriteHoldCount returns number of recursive holds
132	>	*/
133	>	public void testGetWriteHoldCount() {
134	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
135	>	for (int i = 1; i <= SIZE; i++) {
136	>	lock.writeLock().lock();
137	>	assertEquals(i,lock.getWriteHoldCount());
138	>	}
139	>	for (int i = SIZE; i > 0; i--) {
140		lock.writeLock().unlock();
141	<	t.join();
103	<	} catch(Exception e){
104	<	fail("unexpected exception");
105	<	}
106	<	}
107	<
108	<	public void testInterruptedException4(){
109	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
110	<	lock.writeLock().lock();
111	<	Thread t = new Thread(new Runnable() {
112	<	public void run(){
113	<	try{
114	<	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
115	<	fail("should throw");
116	<	}catch(InterruptedException success){}
117	<	}
118	<	});
119	<	try {
120	<	t.start();
121	<	t.interrupt();
122	<	t.join();
123	<	} catch(Exception e){
124	<	fail("unexpected exception");
141	>	assertEquals(i-1,lock.getWriteHoldCount());
142		}
143		}
144
145	<
146	<	public void testTryLockWhenLocked() {
147	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
148	<	lock.writeLock().lock();
149	<	Thread t = new Thread(new Runnable() {
150	<	public void run(){
151	<	assertFalse(lock.writeLock().tryLock());
152	<	}
136	<	});
137	<	try {
138	<	t.start();
139	<	t.join();
140	<	lock.writeLock().unlock();
141	<	} catch(Exception e){
142	<	fail("unexpected exception");
145	>	/**
146	>	* WriteLock.getHoldCount returns number of recursive holds
147	>	*/
148	>	public void testGetHoldCount() {
149	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
150	>	for (int i = 1; i <= SIZE; i++) {
151	>	lock.writeLock().lock();
152	>	assertEquals(i,lock.writeLock().getHoldCount());
153		}
154	<	}
145	<
146	<	public void testTryLockWhenLocked2() {
147	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
148	<	lock.writeLock().lock();
149	<	Thread t = new Thread(new Runnable() {
150	<	public void run(){
151	<	assertFalse(lock.readLock().tryLock());
152	<	}
153	<	});
154	<	try {
155	<	t.start();
156	<	t.join();
154	>	for (int i = SIZE; i > 0; i--) {
155		lock.writeLock().unlock();
156	<	} catch(Exception e){
159	<	fail("unexpected exception");
156	>	assertEquals(i-1,lock.writeLock().getHoldCount());
157		}
158	<	}
158	>	}
159
160	<	public void testMultipleReadLocks() {
161	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
162	<	lock.readLock().lock();
163	<	Thread t = new Thread(new Runnable() {
164	<	public void run(){
165	<	assertTrue(lock.readLock().tryLock());
166	<	lock.readLock().unlock();
167	<	}
171	<	});
172	<	try {
173	<	t.start();
174	<	t.join();
175	<	lock.readLock().unlock();
176	<	} catch(Exception e){
177	<	fail("unexpected exception");
160	>	/**
161	>	* getReadHoldCount returns number of recursive holds
162	>	*/
163	>	public void testGetReadHoldCount() {
164	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
165	>	for (int i = 1; i <= SIZE; i++) {
166	>	lock.readLock().lock();
167	>	assertEquals(i,lock.getReadHoldCount());
168		}
169	<	}
180	<
181	<	public void testWriteAfterMultipleReadLocks() {
182	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
183	<	lock.readLock().lock();
184	<	Thread t1 = new Thread(new Runnable() {
185	<	public void run(){
186	<	lock.readLock().lock();
187	<	lock.readLock().unlock();
188	<	}
189	<	});
190	<	Thread t2 = new Thread(new Runnable() {
191	<	public void run(){
192	<	lock.writeLock().lock();
193	<	lock.writeLock().unlock();
194	<	}
195	<	});
196	<
197	<	try {
198	<	t1.start();
199	<	t2.start();
200	<	Thread.sleep(SHORT_DELAY_MS);
169	>	for (int i = SIZE; i > 0; i--) {
170		lock.readLock().unlock();
171	<	t1.join(MEDIUM_DELAY_MS);
203	<	t2.join(MEDIUM_DELAY_MS);
204	<	assertTrue(!t1.isAlive());
205	<	assertTrue(!t2.isAlive());
206	<
207	<	} catch(Exception e){
208	<	fail("unexpected exception");
209	<	}
210	<	}
211	<
212	<	public void testReadAfterWriteLock() {
213	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
214	<	lock.writeLock().lock();
215	<	Thread t1 = new Thread(new Runnable() {
216	<	public void run(){
217	<	lock.readLock().lock();
218	<	lock.readLock().unlock();
219	<	}
220	<	});
221	<	Thread t2 = new Thread(new Runnable() {
222	<	public void run(){
223	<	lock.readLock().lock();
224	<	lock.readLock().unlock();
225	<	}
226	<	});
227	<
228	<	try {
229	<	t1.start();
230	<	t2.start();
231	<	Thread.sleep(SHORT_DELAY_MS);
232	<	lock.writeLock().unlock();
233	<	t1.join(MEDIUM_DELAY_MS);
234	<	t2.join(MEDIUM_DELAY_MS);
235	<	assertTrue(!t1.isAlive());
236	<	assertTrue(!t2.isAlive());
237	<
238	<	} catch(Exception e){
239	<	fail("unexpected exception");
240	<	}
241	<	}
242	<
243	<
244	<	public void testTryLockWhenReadLocked() {
245	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
246	<	lock.readLock().lock();
247	<	Thread t = new Thread(new Runnable() {
248	<	public void run(){
249	<	assertTrue(lock.readLock().tryLock());
250	<	lock.readLock().unlock();
251	<	}
252	<	});
253	<	try {
254	<	t.start();
255	<	t.join();
256	<	lock.readLock().unlock();
257	<	} catch(Exception e){
258	<	fail("unexpected exception");
171	>	assertEquals(i-1,lock.getReadHoldCount());
172		}
173	<	}
173	>	}
174
262	–
175
176	<	public void testWriteTryLockWhenReadLocked() {
177	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
178	<	lock.readLock().lock();
179	<	Thread t = new Thread(new Runnable() {
180	<	public void run(){
269	<	assertFalse(lock.writeLock().tryLock());
270	<	}
271	<	});
176	>	/**
177	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
178	>	*/
179	>	public void testUnlock_IllegalMonitorStateException() {
180	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
181		try {
182	<	t.start();
183	<	t.join();
184	<	lock.readLock().unlock();
185	<	} catch(Exception e){
277	<	fail("unexpected exception");
278	<	}
279	<	}
182	>	rl.writeLock().unlock();
183	>	shouldThrow();
184	>	} catch (IllegalMonitorStateException success) {}
185	>	}
186
281	–
187
188	<	public void testTryLock_Timeout(){
189	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
190	<	lock.writeLock().lock();
191	<	Thread t = new Thread(new Runnable() {
192	<	public void run(){
193	<	try {
194	<	assertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
195	<	} catch (Exception ex) {
196	<	fail("unexpected exception");
197	<	}
198	<	}
199	<	});
200	<	try {
201	<	t.start();
202	<	t.join();
203	<	lock.writeLock().unlock();
204	<	} catch(Exception e){
205	<	fail("unexpected exception");
206	<	}
207	<	}
188	>	/**
189	>	* write-lockInterruptibly is interruptible
190	>	*/
191	>	public void testWriteLockInterruptibly_Interrupted() throws Exception {
192	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
193	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
194	>	public void realRun() throws InterruptedException {
195	>	lock.writeLock().lockInterruptibly();
196	>	lock.writeLock().unlock();
197	>	lock.writeLock().lockInterruptibly();
198	>	lock.writeLock().unlock();
199	>	}});
200	>
201	>	lock.writeLock().lock();
202	>	t.start();
203	>	Thread.sleep(SHORT_DELAY_MS);
204	>	t.interrupt();
205	>	Thread.sleep(SHORT_DELAY_MS);
206	>	lock.writeLock().unlock();
207	>	t.join();
208	>	}
209
210	<	public void testTryLock_Timeout2(){
211	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
212	<	lock.writeLock().lock();
213	<	Thread t = new Thread(new Runnable() {
214	<	public void run(){
215	<	try {
216	<	assertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
217	<	} catch (Exception ex) {
218	<	fail("unexpected exception");
219	<	}
220	<	}
221	<	});
222	<	try {
223	<	t.start();
224	<	t.join();
225	<	lock.writeLock().unlock();
320	<	} catch(Exception e){
321	<	fail("unexpected exception");
322	<	}
323	<	}
210	>	/**
211	>	* timed write-tryLock is interruptible
212	>	*/
213	>	public void testWriteTryLock_Interrupted() throws InterruptedException {
214	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
215	>	lock.writeLock().lock();
216	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
217	>	public void realRun() throws InterruptedException {
218	>	lock.writeLock().tryLock(1000,MILLISECONDS);
219	>	}});
220	>
221	>	t.start();
222	>	t.interrupt();
223	>	lock.writeLock().unlock();
224	>	t.join();
225	>	}
226
227	+	/**
228	+	* read-lockInterruptibly is interruptible
229	+	*/
230	+	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
231	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
232	+	lock.writeLock().lock();
233	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
234	+	public void realRun() throws InterruptedException {
235	+	lock.readLock().lockInterruptibly();
236	+	}});
237	+
238	+	t.start();
239	+	Thread.sleep(SHORT_DELAY_MS);
240	+	t.interrupt();
241	+	Thread.sleep(SHORT_DELAY_MS);
242	+	lock.writeLock().unlock();
243	+	t.join();
244	+	}
245
246	<	public void testLockInterruptibly() {
247	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
248	<	try {
249	<	lock.writeLock().lockInterruptibly();
250	<	} catch(Exception e) {
251	<	fail("unexpected exception");
252	<	}
253	<	Thread t = new Thread(new Runnable() {
254	<	public void run() {
255	<	try {
256	<	lock.writeLock().lockInterruptibly();
257	<	fail("should throw");
258	<	}
259	<	catch(InterruptedException success) {
340	<	}
341	<	}
342	<	});
343	<	try {
344	<	t.start();
345	<	t.interrupt();
346	<	t.join();
347	<	lock.writeLock().unlock();
348	<	} catch(Exception e){
349	<	fail("unexpected exception");
350	<	}
246	>	/**
247	>	* timed read-tryLock is interruptible
248	>	*/
249	>	public void testReadTryLock_Interrupted() throws InterruptedException {
250	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
251	>	lock.writeLock().lock();
252	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
253	>	public void realRun() throws InterruptedException {
254	>	lock.readLock().tryLock(1000,MILLISECONDS);
255	>	}});
256	>
257	>	t.start();
258	>	t.interrupt();
259	>	t.join();
260		}
261
262	<	public void testLockInterruptibly2() {
263	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
264	<	try {
265	<	lock.writeLock().lockInterruptibly();
266	<	} catch(Exception e) {
267	<	fail("unexpected exception");
268	<	}
269	<	Thread t = new Thread(new Runnable() {
270	<	public void run() {
271	<	try {
272	<	lock.readLock().lockInterruptibly();
273	<	fail("should throw");
274	<	}
275	<	catch(InterruptedException success) {
276	<	}
368	<	}
369	<	});
370	<	try {
371	<	t.start();
372	<	t.interrupt();
373	<	t.join();
374	<	lock.writeLock().unlock();
375	<	} catch(Exception e){
376	<	fail("unexpected exception");
377	<	}
262	>
263	>	/**
264	>	* write-tryLock fails if locked
265	>	*/
266	>	public void testWriteTryLockWhenLocked() throws InterruptedException {
267	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
268	>	lock.writeLock().lock();
269	>	Thread t = new Thread(new CheckedRunnable() {
270	>	public void realRun() {
271	>	threadAssertFalse(lock.writeLock().tryLock());
272	>	}});
273	>
274	>	t.start();
275	>	t.join();
276	>	lock.writeLock().unlock();
277		}
278
279	<	public void testAwait_IllegalMonitor() {
280	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
279	>	/**
280	>	* read-tryLock fails if locked
281	>	*/
282	>	public void testReadTryLockWhenLocked() throws InterruptedException {
283	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
284	>	lock.writeLock().lock();
285	>	Thread t = new Thread(new CheckedRunnable() {
286	>	public void realRun() {
287	>	threadAssertFalse(lock.readLock().tryLock());
288	>	}});
289	>
290	>	t.start();
291	>	t.join();
292	>	lock.writeLock().unlock();
293	>	}
294	>
295	>	/**
296	>	* Multiple threads can hold a read lock when not write-locked
297	>	*/
298	>	public void testMultipleReadLocks() throws InterruptedException {
299	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
300	>	lock.readLock().lock();
301	>	Thread t = new Thread(new CheckedRunnable() {
302	>	public void realRun() {
303	>	threadAssertTrue(lock.readLock().tryLock());
304	>	lock.readLock().unlock();
305	>	}});
306	>
307	>	t.start();
308	>	t.join();
309	>	lock.readLock().unlock();
310	>	}
311	>
312	>	/**
313	>	* 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 = new Thread(new CheckedRunnable() {
319	>	public void realRun() {
320	>	lock.readLock().lock();
321	>	lock.readLock().unlock();
322	>	}});
323	>	Thread t2 = new Thread(new CheckedRunnable() {
324	>	public void realRun() {
325	>	lock.writeLock().lock();
326	>	lock.writeLock().unlock();
327	>	}});
328	>
329	>	t1.start();
330	>	t2.start();
331	>	Thread.sleep(SHORT_DELAY_MS);
332	>	lock.readLock().unlock();
333	>	t1.join(MEDIUM_DELAY_MS);
334	>	t2.join(MEDIUM_DELAY_MS);
335	>	assertTrue(!t1.isAlive());
336	>	assertTrue(!t2.isAlive());
337	>	}
338	>
339	>	/**
340	>	* Readlocks succeed after a writing thread unlocks
341	>	*/
342	>	public void testReadAfterWriteLock() throws InterruptedException {
343	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
344	>	lock.writeLock().lock();
345	>	Thread t1 = new Thread(new CheckedRunnable() {
346	>	public void realRun() {
347	>	lock.readLock().lock();
348	>	lock.readLock().unlock();
349	>	}});
350	>	Thread t2 = new Thread(new CheckedRunnable() {
351	>	public void realRun() {
352	>	lock.readLock().lock();
353	>	lock.readLock().unlock();
354	>	}});
355	>
356	>	t1.start();
357	>	t2.start();
358	>	Thread.sleep(SHORT_DELAY_MS);
359	>	lock.writeLock().unlock();
360	>	t1.join(MEDIUM_DELAY_MS);
361	>	t2.join(MEDIUM_DELAY_MS);
362	>	assertTrue(!t1.isAlive());
363	>	assertTrue(!t2.isAlive());
364	>	}
365	>
366	>	/**
367	>	* Read trylock succeeds if write locked by current thread
368	>	*/
369	>	public void testReadHoldingWriteLock() {
370	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
371	>	lock.writeLock().lock();
372	>	assertTrue(lock.readLock().tryLock());
373	>	lock.readLock().unlock();
374	>	lock.writeLock().unlock();
375	>	}
376	>
377	>	/**
378	>	* Read lock succeeds if write locked by current thread even if
379	>	* other threads are waiting for readlock
380	>	*/
381	>	public void testReadHoldingWriteLock2() throws InterruptedException {
382	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
383	>	lock.writeLock().lock();
384	>	Thread t1 = new Thread(new CheckedRunnable() {
385	>	public void realRun() {
386	>	lock.readLock().lock();
387	>	lock.readLock().unlock();
388	>	}});
389	>	Thread t2 = new Thread(new CheckedRunnable() {
390	>	public void realRun() {
391	>	lock.readLock().lock();
392	>	lock.readLock().unlock();
393	>	}});
394	>
395	>	t1.start();
396	>	t2.start();
397	>	lock.readLock().lock();
398	>	lock.readLock().unlock();
399	>	Thread.sleep(SHORT_DELAY_MS);
400	>	lock.readLock().lock();
401	>	lock.readLock().unlock();
402	>	lock.writeLock().unlock();
403	>	t1.join(MEDIUM_DELAY_MS);
404	>	t2.join(MEDIUM_DELAY_MS);
405	>	assertTrue(!t1.isAlive());
406	>	assertTrue(!t2.isAlive());
407	>	}
408	>
409	>	/**
410	>	*  Read lock succeeds if write locked by current thread even if
411	>	* other threads are waiting for writelock
412	>	*/
413	>	public void testReadHoldingWriteLock3() throws InterruptedException {
414	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
415	>	lock.writeLock().lock();
416	>	Thread t1 = new Thread(new CheckedRunnable() {
417	>	public void realRun() {
418	>	lock.writeLock().lock();
419	>	lock.writeLock().unlock();
420	>	}});
421	>	Thread t2 = new Thread(new CheckedRunnable() {
422	>	public void realRun() {
423	>	lock.writeLock().lock();
424	>	lock.writeLock().unlock();
425	>	}});
426	>
427	>	t1.start();
428	>	t2.start();
429	>	lock.readLock().lock();
430	>	lock.readLock().unlock();
431	>	Thread.sleep(SHORT_DELAY_MS);
432	>	lock.readLock().lock();
433	>	lock.readLock().unlock();
434	>	lock.writeLock().unlock();
435	>	t1.join(MEDIUM_DELAY_MS);
436	>	t2.join(MEDIUM_DELAY_MS);
437	>	assertTrue(!t1.isAlive());
438	>	assertTrue(!t2.isAlive());
439	>	}
440	>
441	>
442	>	/**
443	>	*  Write lock succeeds if write locked by current thread even if
444	>	* other threads are waiting for writelock
445	>	*/
446	>	public void testWriteHoldingWriteLock4() throws InterruptedException {
447	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
448	>	lock.writeLock().lock();
449	>	Thread t1 = new Thread(new CheckedRunnable() {
450	>	public void realRun() {
451	>	lock.writeLock().lock();
452	>	lock.writeLock().unlock();
453	>	}});
454	>	Thread t2 = new Thread(new CheckedRunnable() {
455	>	public void realRun() {
456	>	lock.writeLock().lock();
457	>	lock.writeLock().unlock();
458	>	}});
459	>
460	>	t1.start();
461	>	t2.start();
462	>	lock.writeLock().lock();
463	>	lock.writeLock().unlock();
464	>	Thread.sleep(SHORT_DELAY_MS);
465	>	lock.writeLock().lock();
466	>	lock.writeLock().unlock();
467	>	lock.writeLock().unlock();
468	>	t1.join(MEDIUM_DELAY_MS);
469	>	t2.join(MEDIUM_DELAY_MS);
470	>	assertTrue(!t1.isAlive());
471	>	assertTrue(!t2.isAlive());
472	>	}
473	>
474	>
475	>	/**
476	>	* Fair Read trylock succeeds if write locked by current thread
477	>	*/
478	>	public void testReadHoldingWriteLockFair() {
479	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
480	>	lock.writeLock().lock();
481	>	assertTrue(lock.readLock().tryLock());
482	>	lock.readLock().unlock();
483	>	lock.writeLock().unlock();
484	>	}
485	>
486	>	/**
487	>	* Fair Read lock succeeds if write locked by current thread even if
488	>	* other threads are waiting for readlock
489	>	*/
490	>	public void testReadHoldingWriteLockFair2() throws InterruptedException {
491	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
492	>	lock.writeLock().lock();
493	>	Thread t1 = new Thread(new CheckedRunnable() {
494	>	public void realRun() {
495	>	lock.readLock().lock();
496	>	lock.readLock().unlock();
497	>	}});
498	>	Thread t2 = new Thread(new CheckedRunnable() {
499	>	public void realRun() {
500	>	lock.readLock().lock();
501	>	lock.readLock().unlock();
502	>	}});
503	>
504	>	t1.start();
505	>	t2.start();
506	>	lock.readLock().lock();
507	>	lock.readLock().unlock();
508	>	Thread.sleep(SHORT_DELAY_MS);
509	>	lock.readLock().lock();
510	>	lock.readLock().unlock();
511	>	lock.writeLock().unlock();
512	>	t1.join(MEDIUM_DELAY_MS);
513	>	t2.join(MEDIUM_DELAY_MS);
514	>	assertTrue(!t1.isAlive());
515	>	assertTrue(!t2.isAlive());
516	>	}
517	>
518	>
519	>	/**
520	>	* Fair Read lock succeeds if write locked by current thread even if
521	>	* other threads are waiting for writelock
522	>	*/
523	>	public void testReadHoldingWriteLockFair3() throws InterruptedException {
524	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
525	>	lock.writeLock().lock();
526	>	Thread t1 = new Thread(new CheckedRunnable() {
527	>	public void realRun() {
528	>	lock.writeLock().lock();
529	>	lock.writeLock().unlock();
530	>	}});
531	>	Thread t2 = new Thread(new CheckedRunnable() {
532	>	public void realRun() {
533	>	lock.writeLock().lock();
534	>	lock.writeLock().unlock();
535	>	}});
536	>
537	>	t1.start();
538	>	t2.start();
539	>	lock.readLock().lock();
540	>	lock.readLock().unlock();
541	>	Thread.sleep(SHORT_DELAY_MS);
542	>	lock.readLock().lock();
543	>	lock.readLock().unlock();
544	>	lock.writeLock().unlock();
545	>	t1.join(MEDIUM_DELAY_MS);
546	>	t2.join(MEDIUM_DELAY_MS);
547	>	assertTrue(!t1.isAlive());
548	>	assertTrue(!t2.isAlive());
549	>	}
550	>
551	>
552	>	/**
553	>	* Fair Write lock succeeds if write locked by current thread even if
554	>	* other threads are waiting for writelock
555	>	*/
556	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
557	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
558	>	lock.writeLock().lock();
559	>	Thread t1 = new Thread(new CheckedRunnable() {
560	>	public void realRun() {
561	>	lock.writeLock().lock();
562	>	lock.writeLock().unlock();
563	>	}});
564	>	Thread t2 = new Thread(new CheckedRunnable() {
565	>	public void realRun() {
566	>	lock.writeLock().lock();
567	>	lock.writeLock().unlock();
568	>	}});
569	>
570	>	t1.start();
571	>	t2.start();
572	>	Thread.sleep(SHORT_DELAY_MS);
573	>	assertTrue(lock.isWriteLockedByCurrentThread());
574	>	assertTrue(lock.getWriteHoldCount() == 1);
575	>	lock.writeLock().lock();
576	>	assertTrue(lock.getWriteHoldCount() == 2);
577	>	lock.writeLock().unlock();
578	>	lock.writeLock().lock();
579	>	lock.writeLock().unlock();
580	>	lock.writeLock().unlock();
581	>	t1.join(MEDIUM_DELAY_MS);
582	>	t2.join(MEDIUM_DELAY_MS);
583	>	assertTrue(!t1.isAlive());
584	>	assertTrue(!t2.isAlive());
585	>	}
586	>
587	>
588	>	/**
589	>	* Read tryLock succeeds if readlocked but not writelocked
590	>	*/
591	>	public void testTryLockWhenReadLocked() throws InterruptedException {
592	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
593	>	lock.readLock().lock();
594	>	Thread t = new Thread(new CheckedRunnable() {
595	>	public void realRun() {
596	>	threadAssertTrue(lock.readLock().tryLock());
597	>	lock.readLock().unlock();
598	>	}});
599	>
600	>	t.start();
601	>	t.join();
602	>	lock.readLock().unlock();
603	>	}
604	>
605	>
606	>
607	>	/**
608	>	* write tryLock fails when readlocked
609	>	*/
610	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
611	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
612	>	lock.readLock().lock();
613	>	Thread t = new Thread(new CheckedRunnable() {
614	>	public void realRun() {
615	>	threadAssertFalse(lock.writeLock().tryLock());
616	>	}});
617	>
618	>	t.start();
619	>	t.join();
620	>	lock.readLock().unlock();
621	>	}
622	>
623	>
624	>	/**
625	>	* Fair Read tryLock succeeds if readlocked but not writelocked
626	>	*/
627	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
628	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
629	>	lock.readLock().lock();
630	>	Thread t = new Thread(new CheckedRunnable() {
631	>	public void realRun() {
632	>	threadAssertTrue(lock.readLock().tryLock());
633	>	lock.readLock().unlock();
634	>	}});
635	>
636	>	t.start();
637	>	t.join();
638	>	lock.readLock().unlock();
639	>	}
640	>
641	>
642	>
643	>	/**
644	>	* Fair write tryLock fails when readlocked
645	>	*/
646	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
647	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
648	>	lock.readLock().lock();
649	>	Thread t = new Thread(new CheckedRunnable() {
650	>	public void realRun() {
651	>	threadAssertFalse(lock.writeLock().tryLock());
652	>	}});
653	>
654	>	t.start();
655	>	t.join();
656	>	lock.readLock().unlock();
657	>	}
658	>
659	>
660	>
661	>	/**
662	>	* write timed tryLock times out if locked
663	>	*/
664	>	public void testWriteTryLock_Timeout() throws InterruptedException {
665	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
666	>	lock.writeLock().lock();
667	>	Thread t = new Thread(new CheckedRunnable() {
668	>	public void realRun() throws InterruptedException {
669	>	threadAssertFalse(lock.writeLock().tryLock(1, MILLISECONDS));
670	>	}});
671	>
672	>	t.start();
673	>	t.join();
674	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
675	>	lock.writeLock().unlock();
676	>	}
677	>
678	>	/**
679	>	* read timed tryLock times out if write-locked
680	>	*/
681	>	public void testReadTryLock_Timeout() throws InterruptedException {
682	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
683	>	lock.writeLock().lock();
684	>	Thread t = new Thread(new CheckedRunnable() {
685	>	public void realRun() throws InterruptedException {
686	>	threadAssertFalse(lock.readLock().tryLock(1, MILLISECONDS));
687	>	}});
688	>
689	>	t.start();
690	>	t.join();
691	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
692	>	lock.writeLock().unlock();
693	>	}
694	>
695	>
696	>	/**
697	>	* write lockInterruptibly succeeds if lock free else is interruptible
698	>	*/
699	>	public void testWriteLockInterruptibly() throws InterruptedException {
700	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
701	>	lock.writeLock().lockInterruptibly();
702	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
703	>	public void realRun() throws InterruptedException {
704	>	lock.writeLock().lockInterruptibly();
705	>	}});
706	>
707	>	t.start();
708	>	Thread.sleep(SHORT_DELAY_MS);
709	>	t.interrupt();
710	>	Thread.sleep(SHORT_DELAY_MS);
711	>	t.join();
712	>	lock.writeLock().unlock();
713	>	}
714	>
715	>	/**
716	>	*  read lockInterruptibly succeeds if lock free else is interruptible
717	>	*/
718	>	public void testReadLockInterruptibly() throws InterruptedException {
719	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
720	>	lock.writeLock().lockInterruptibly();
721	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
722	>	public void realRun() throws InterruptedException {
723	>	lock.readLock().lockInterruptibly();
724	>	}});
725	>
726	>	t.start();
727	>	Thread.sleep(SHORT_DELAY_MS);
728	>	t.interrupt();
729	>	t.join();
730	>	lock.writeLock().unlock();
731	>	}
732	>
733	>	/**
734	>	* Calling await without holding lock throws IllegalMonitorStateException
735	>	*/
736	>	public void testAwait_IllegalMonitor() throws InterruptedException {
737	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
738		final Condition c = lock.writeLock().newCondition();
739		try {
740		c.await();
741	<	fail("should throw");
742	<	}
387	<	catch (IllegalMonitorStateException success) {
388	<	}
389	<	catch (Exception ex) {
390	<	fail("should throw IMSE");
391	<	}
741	>	shouldThrow();
742	>	} catch (IllegalMonitorStateException success) {}
743		}
744
745	+	/**
746	+	* Calling signal without holding lock throws IllegalMonitorStateException
747	+	*/
748		public void testSignal_IllegalMonitor() {
749	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
749	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
750		final Condition c = lock.writeLock().newCondition();
751		try {
752		c.signal();
753	<	fail("should throw");
754	<	}
401	<	catch (IllegalMonitorStateException success) {
402	<	}
403	<	catch (Exception ex) {
404	<	fail("should throw IMSE");
405	<	}
753	>	shouldThrow();
754	>	} catch (IllegalMonitorStateException success) {}
755		}
756
757	<	public void testAwaitNanos_Timeout() {
758	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
757	>	/**
758	>	* awaitNanos without a signal times out
759	>	*/
760	>	public void testAwaitNanos_Timeout() throws InterruptedException {
761	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
762		final Condition c = lock.writeLock().newCondition();
763	<	try {
764	<	lock.writeLock().lock();
765	<	long t = c.awaitNanos(100);
766	<	assertTrue(t <= 0);
767	<	lock.writeLock().unlock();
416	<	}
417	<	catch (Exception ex) {
418	<	fail("unexpected exception");
419	<	}
763	>
764	>	lock.writeLock().lock();
765	>	long t = c.awaitNanos(100);
766	>	assertTrue(t <= 0);
767	>	lock.writeLock().unlock();
768		}
769
770	<	public void testAwait_Timeout() {
771	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
770	>
771	>	/**
772	>	*  timed await without a signal times out
773	>	*/
774	>	public void testAwait_Timeout() throws InterruptedException {
775	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
776		final Condition c = lock.writeLock().newCondition();
777	<	try {
778	<	lock.writeLock().lock();
779	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
428	<	lock.writeLock().unlock();
429	<	}
430	<	catch (Exception ex) {
431	<	fail("unexpected exception");
432	<	}
777	>	lock.writeLock().lock();
778	>	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
779	>	lock.writeLock().unlock();
780		}
781
782	<	public void testAwaitUntil_Timeout() {
783	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
782	>	/**
783	>	* awaitUntil without a signal times out
784	>	*/
785	>	public void testAwaitUntil_Timeout() throws InterruptedException {
786	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
787		final Condition c = lock.writeLock().newCondition();
788	<	try {
789	<	lock.writeLock().lock();
790	<	java.util.Date d = new java.util.Date();
791	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
442	<	lock.writeLock().unlock();
443	<	}
444	<	catch (Exception ex) {
445	<	fail("unexpected exception");
446	<	}
788	>	lock.writeLock().lock();
789	>	java.util.Date d = new java.util.Date();
790	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
791	>	lock.writeLock().unlock();
792		}
793
794	<	public void testAwait() {
795	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
794	>	/**
795	>	* await returns when signalled
796	>	*/
797	>	public void testAwait() throws InterruptedException {
798	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
799		final Condition c = lock.writeLock().newCondition();
800	<	Thread t = new Thread(new Runnable() {
801	<	public void run() {
802	<	try {
803	<	lock.writeLock().lock();
804	<	c.await();
805	<	lock.writeLock().unlock();
806	<	}
807	<	catch(InterruptedException e) {
808	<	fail("unexpected exception");
809	<	}
810	<	}
811	<	});
800	>	Thread t = new Thread(new CheckedRunnable() {
801	>	public void realRun() throws InterruptedException {
802	>	lock.writeLock().lock();
803	>	c.await();
804	>	lock.writeLock().unlock();
805	>	}});
806	>
807	>	t.start();
808	>	Thread.sleep(SHORT_DELAY_MS);
809	>	lock.writeLock().lock();
810	>	c.signal();
811	>	lock.writeLock().unlock();
812	>	t.join(SHORT_DELAY_MS);
813	>	assertFalse(t.isAlive());
814	>	}
815
816	<	try {
817	<	t.start();
818	<	Thread.sleep(SHORT_DELAY_MS);
819	<	lock.writeLock().lock();
820	<	c.signal();
821	<	lock.writeLock().unlock();
822	<	t.join(SHORT_DELAY_MS);
823	<	assertFalse(t.isAlive());
824	<	}
825	<	catch (Exception ex) {
826	<	fail("unexpected exception");
816	>	/** A helper class for uninterruptible wait tests */
817	>	class UninterruptableThread extends Thread {
818	>	private Lock lock;
819	>	private Condition c;
820	>
821	>	public volatile boolean canAwake = false;
822	>	public volatile boolean interrupted = false;
823	>	public volatile boolean lockStarted = false;
824	>
825	>	public UninterruptableThread(Lock lock, Condition c) {
826	>	this.lock = lock;
827	>	this.c = c;
828	>	}
829	>
830	>	public synchronized void run() {
831	>	lock.lock();
832	>	lockStarted = true;
833	>
834	>	while (!canAwake) {
835	>	c.awaitUninterruptibly();
836	>	}
837	>
838	>	interrupted = isInterrupted();
839	>	lock.unlock();
840		}
841		}
842
843	<	public void testAwaitUninterruptibly() {
844	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
843	>	/**
844	>	* awaitUninterruptibly doesn't abort on interrupt
845	>	*/
846	>	public void testAwaitUninterruptibly() throws InterruptedException {
847	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
848		final Condition c = lock.writeLock().newCondition();
849	<	Thread t = new Thread(new Runnable() {
850	<	public void run() {
851	<	lock.writeLock().lock();
852	<	c.awaitUninterruptibly();
853	<	lock.writeLock().unlock();
854	<	}
855	<	});
849	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
850	>
851	>	thread.start();
852	>
853	>	while (!thread.lockStarted) {
854	>	Thread.sleep(100);
855	>	}
856
857	+	lock.writeLock().lock();
858		try {
859	<	t.start();
860	<	Thread.sleep(SHORT_DELAY_MS);
493	<	t.interrupt();
494	<	lock.writeLock().lock();
859	>	thread.interrupt();
860	>	thread.canAwake = true;
861		c.signal();
862	+	} finally {
863		lock.writeLock().unlock();
497	–	t.join(SHORT_DELAY_MS);
498	–	assertFalse(t.isAlive());
499	–	}
500	–	catch (Exception ex) {
501	–	fail("unexpected exception");
864		}
865	+
866	+	thread.join();
867	+	assertTrue(thread.interrupted);
868	+	assertFalse(thread.isAlive());
869		}
870
871	<	public void testAwait_Interrupt() {
872	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
873	<	final Condition c = lock.writeLock().newCondition();
874	<	Thread t = new Thread(new Runnable() {
875	<	public void run() {
876	<	try {
877	<	lock.writeLock().lock();
878	<	c.await();
879	<	lock.writeLock().unlock();
880	<	fail("should throw");
881	<	}
882	<	catch(InterruptedException success) {
883	<	}
884	<	}
885	<	});
886	<
887	<	try {
888	<	t.start();
889	<	Thread.sleep(SHORT_DELAY_MS);
890	<	t.interrupt();
891	<	t.join(SHORT_DELAY_MS);
892	<	assertFalse(t.isAlive());
893	<	}
894	<	catch (Exception ex) {
895	<	fail("unexpected exception");
896	<	}
897	<	}
898	<
899	<	public void testAwaitNanos_Interrupt() {
900	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
901	<	final Condition c = lock.writeLock().newCondition();
902	<	Thread t = new Thread(new Runnable() {
903	<	public void run() {
904	<	try {
905	<	lock.writeLock().lock();
906	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
907	<	lock.writeLock().unlock();
908	<	fail("should throw");
909	<	}
910	<	catch(InterruptedException success) {
911	<	}
912	<	}
913	<	});
914	<
915	<	try {
916	<	t.start();
917	<	Thread.sleep(SHORT_DELAY_MS);
918	<	t.interrupt();
919	<	t.join(SHORT_DELAY_MS);
920	<	assertFalse(t.isAlive());
921	<	}
922	<	catch (Exception ex) {
923	<	fail("unexpected exception");
924	<	}
925	<	}
926	<
927	<	public void testAwaitUntil_Interrupt() {
928	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
929	<	final Condition c = lock.writeLock().newCondition();
564	<	Thread t = new Thread(new Runnable() {
565	<	public void run() {
566	<	try {
567	<	lock.writeLock().lock();
568	<	java.util.Date d = new java.util.Date();
569	<	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
570	<	lock.writeLock().unlock();
571	<	fail("should throw");
572	<	}
573	<	catch(InterruptedException success) {
574	<	}
575	<	}
576	<	});
577	<
578	<	try {
579	<	t.start();
580	<	Thread.sleep(SHORT_DELAY_MS);
581	<	t.interrupt();
582	<	t.join(SHORT_DELAY_MS);
583	<	assertFalse(t.isAlive());
584	<	}
585	<	catch (Exception ex) {
586	<	fail("unexpected exception");
587	<	}
588	<	}
589	<
590	<	public void testSignalAll() {
591	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
592	<	final Condition c = lock.writeLock().newCondition();
593	<	Thread t1 = new Thread(new Runnable() {
594	<	public void run() {
595	<	try {
596	<	lock.writeLock().lock();
597	<	c.await();
598	<	lock.writeLock().unlock();
599	<	}
600	<	catch(InterruptedException e) {
601	<	fail("unexpected exception");
602	<	}
603	<	}
604	<	});
605	<
606	<	Thread t2 = new Thread(new Runnable() {
607	<	public void run() {
608	<	try {
609	<	lock.writeLock().lock();
610	<	c.await();
611	<	lock.writeLock().unlock();
612	<	}
613	<	catch(InterruptedException e) {
614	<	fail("unexpected exception");
615	<	}
616	<	}
617	<	});
618	<
619	<	try {
620	<	t1.start();
621	<	t2.start();
622	<	Thread.sleep(SHORT_DELAY_MS);
623	<	lock.writeLock().lock();
624	<	c.signalAll();
625	<	lock.writeLock().unlock();
626	<	t1.join(SHORT_DELAY_MS);
627	<	t2.join(SHORT_DELAY_MS);
628	<	assertFalse(t1.isAlive());
629	<	assertFalse(t2.isAlive());
630	<	}
631	<	catch (Exception ex) {
632	<	fail("unexpected exception");
633	<	}
871	>	/**
872	>	* await is interruptible
873	>	*/
874	>	public void testAwait_Interrupt() throws InterruptedException {
875	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
876	>	final Condition c = lock.writeLock().newCondition();
877	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
878	>	public void realRun() throws InterruptedException {
879	>	lock.writeLock().lock();
880	>	c.await();
881	>	lock.writeLock().unlock();
882	>	}});
883	>
884	>	t.start();
885	>	Thread.sleep(SHORT_DELAY_MS);
886	>	t.interrupt();
887	>	t.join(SHORT_DELAY_MS);
888	>	assertFalse(t.isAlive());
889	>	}
890	>
891	>	/**
892	>	* awaitNanos is interruptible
893	>	*/
894	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
895	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
896	>	final Condition c = lock.writeLock().newCondition();
897	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
898	>	public void realRun() throws InterruptedException {
899	>	lock.writeLock().lock();
900	>	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
901	>	lock.writeLock().unlock();
902	>	}});
903	>
904	>	t.start();
905	>	Thread.sleep(SHORT_DELAY_MS);
906	>	t.interrupt();
907	>	t.join(SHORT_DELAY_MS);
908	>	assertFalse(t.isAlive());
909	>	}
910	>
911	>	/**
912	>	* awaitUntil is interruptible
913	>	*/
914	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
915	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
916	>	final Condition c = lock.writeLock().newCondition();
917	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
918	>	public void realRun() throws InterruptedException {
919	>	lock.writeLock().lock();
920	>	java.util.Date d = new java.util.Date();
921	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
922	>	lock.writeLock().unlock();
923	>	}});
924	>
925	>	t.start();
926	>	Thread.sleep(SHORT_DELAY_MS);
927	>	t.interrupt();
928	>	t.join(SHORT_DELAY_MS);
929	>	assertFalse(t.isAlive());
930		}
931
932	<	public void testSerialization() {
932	>	/**
933	>	* signalAll wakes up all threads
934	>	*/
935	>	public void testSignalAll() throws InterruptedException {
936	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
937	>	final Condition c = lock.writeLock().newCondition();
938	>	Thread t1 = new Thread(new CheckedRunnable() {
939	>	public void realRun() throws InterruptedException {
940	>	lock.writeLock().lock();
941	>	c.await();
942	>	lock.writeLock().unlock();
943	>	}});
944	>
945	>	Thread t2 = new Thread(new CheckedRunnable() {
946	>	public void realRun() throws InterruptedException {
947	>	lock.writeLock().lock();
948	>	c.await();
949	>	lock.writeLock().unlock();
950	>	}});
951	>
952	>	t1.start();
953	>	t2.start();
954	>	Thread.sleep(SHORT_DELAY_MS);
955	>	lock.writeLock().lock();
956	>	c.signalAll();
957	>	lock.writeLock().unlock();
958	>	t1.join(SHORT_DELAY_MS);
959	>	t2.join(SHORT_DELAY_MS);
960	>	assertFalse(t1.isAlive());
961	>	assertFalse(t2.isAlive());
962	>	}
963	>
964	>	/**
965	>	* A serialized lock deserializes as unlocked
966	>	*/
967	>	public void testSerialization() throws Exception {
968		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
969		l.readLock().lock();
970		l.readLock().unlock();
971
972	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
973	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
974	+	out.writeObject(l);
975	+	out.close();
976	+
977	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
978	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
979	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
980	+	r.readLock().lock();
981	+	r.readLock().unlock();
982	+	}
983	+
984	+	/**
985	+	* hasQueuedThreads reports whether there are waiting threads
986	+	*/
987	+	public void testhasQueuedThreads() throws InterruptedException {
988	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
989	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
990	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
991	+	assertFalse(lock.hasQueuedThreads());
992	+	lock.writeLock().lock();
993	+	t1.start();
994	+	Thread.sleep(SHORT_DELAY_MS);
995	+	assertTrue(lock.hasQueuedThreads());
996	+	t2.start();
997	+	Thread.sleep(SHORT_DELAY_MS);
998	+	assertTrue(lock.hasQueuedThreads());
999	+	t1.interrupt();
1000	+	Thread.sleep(SHORT_DELAY_MS);
1001	+	assertTrue(lock.hasQueuedThreads());
1002	+	lock.writeLock().unlock();
1003	+	Thread.sleep(SHORT_DELAY_MS);
1004	+	assertFalse(lock.hasQueuedThreads());
1005	+	t1.join();
1006	+	t2.join();
1007	+	}
1008	+
1009	+	/**
1010	+	* hasQueuedThread(null) throws NPE
1011	+	*/
1012	+	public void testHasQueuedThreadNPE() {
1013	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1014		try {
1015	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1016	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1017	<	out.writeObject(l);
645	<	out.close();
646	<
647	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
648	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
649	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
650	<	r.readLock().lock();
651	<	r.readLock().unlock();
652	<	} catch(Exception e){
653	<	e.printStackTrace();
654	<	fail("unexpected exception");
655	<	}
1015	>	sync.hasQueuedThread(null);
1016	>	shouldThrow();
1017	>	} catch (NullPointerException success) {}
1018		}
1019
1020	+	/**
1021	+	* hasQueuedThread reports whether a thread is queued.
1022	+	*/
1023	+	public void testHasQueuedThread() throws InterruptedException {
1024	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1025	+	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1026	+	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1027	+	assertFalse(sync.hasQueuedThread(t1));
1028	+	assertFalse(sync.hasQueuedThread(t2));
1029	+	sync.writeLock().lock();
1030	+	t1.start();
1031	+	Thread.sleep(SHORT_DELAY_MS);
1032	+	assertTrue(sync.hasQueuedThread(t1));
1033	+	t2.start();
1034	+	Thread.sleep(SHORT_DELAY_MS);
1035	+	assertTrue(sync.hasQueuedThread(t1));
1036	+	assertTrue(sync.hasQueuedThread(t2));
1037	+	t1.interrupt();
1038	+	Thread.sleep(SHORT_DELAY_MS);
1039	+	assertFalse(sync.hasQueuedThread(t1));
1040	+	assertTrue(sync.hasQueuedThread(t2));
1041	+	sync.writeLock().unlock();
1042	+	Thread.sleep(SHORT_DELAY_MS);
1043	+	assertFalse(sync.hasQueuedThread(t1));
1044	+	Thread.sleep(SHORT_DELAY_MS);
1045	+	assertFalse(sync.hasQueuedThread(t2));
1046	+	t1.join();
1047	+	t2.join();
1048	+	}
1049	+
1050	+
1051	+	/**
1052	+	* getQueueLength reports number of waiting threads
1053	+	*/
1054	+	public void testGetQueueLength() throws InterruptedException {
1055	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1056	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1057	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1058	+	assertEquals(0, lock.getQueueLength());
1059	+	lock.writeLock().lock();
1060	+	t1.start();
1061	+	Thread.sleep(SHORT_DELAY_MS);
1062	+	assertEquals(1, lock.getQueueLength());
1063	+	t2.start();
1064	+	Thread.sleep(SHORT_DELAY_MS);
1065	+	assertEquals(2, lock.getQueueLength());
1066	+	t1.interrupt();
1067	+	Thread.sleep(SHORT_DELAY_MS);
1068	+	assertEquals(1, lock.getQueueLength());
1069	+	lock.writeLock().unlock();
1070	+	Thread.sleep(SHORT_DELAY_MS);
1071	+	assertEquals(0, lock.getQueueLength());
1072	+	t1.join();
1073	+	t2.join();
1074	+	}
1075	+
1076	+	/**
1077	+	* getQueuedThreads includes waiting threads
1078	+	*/
1079	+	public void testGetQueuedThreads() throws InterruptedException {
1080	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1081	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1082	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1083	+	assertTrue(lock.getQueuedThreads().isEmpty());
1084	+	lock.writeLock().lock();
1085	+	assertTrue(lock.getQueuedThreads().isEmpty());
1086	+	t1.start();
1087	+	Thread.sleep(SHORT_DELAY_MS);
1088	+	assertTrue(lock.getQueuedThreads().contains(t1));
1089	+	t2.start();
1090	+	Thread.sleep(SHORT_DELAY_MS);
1091	+	assertTrue(lock.getQueuedThreads().contains(t1));
1092	+	assertTrue(lock.getQueuedThreads().contains(t2));
1093	+	t1.interrupt();
1094	+	Thread.sleep(SHORT_DELAY_MS);
1095	+	assertFalse(lock.getQueuedThreads().contains(t1));
1096	+	assertTrue(lock.getQueuedThreads().contains(t2));
1097	+	lock.writeLock().unlock();
1098	+	Thread.sleep(SHORT_DELAY_MS);
1099	+	assertTrue(lock.getQueuedThreads().isEmpty());
1100	+	t1.join();
1101	+	t2.join();
1102	+	}
1103	+
1104	+	/**
1105	+	* hasWaiters throws NPE if null
1106	+	*/
1107	+	public void testHasWaitersNPE() {
1108	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1109	+	try {
1110	+	lock.hasWaiters(null);
1111	+	shouldThrow();
1112	+	} catch (NullPointerException success) {}
1113	+	}
1114	+
1115	+	/**
1116	+	* getWaitQueueLength throws NPE if null
1117	+	*/
1118	+	public void testGetWaitQueueLengthNPE() {
1119	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1120	+	try {
1121	+	lock.getWaitQueueLength(null);
1122	+	shouldThrow();
1123	+	} catch (NullPointerException success) {}
1124	+	}
1125	+
1126	+
1127	+	/**
1128	+	* getWaitingThreads throws NPE if null
1129	+	*/
1130	+	public void testGetWaitingThreadsNPE() {
1131	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1132	+	try {
1133	+	lock.getWaitingThreads(null);
1134	+	shouldThrow();
1135	+	} catch (NullPointerException success) {}
1136	+	}
1137	+
1138	+	/**
1139	+	* hasWaiters throws IAE if not owned
1140	+	*/
1141	+	public void testHasWaitersIAE() {
1142	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1143	+	final Condition c = lock.writeLock().newCondition();
1144	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1145	+	try {
1146	+	lock2.hasWaiters(c);
1147	+	shouldThrow();
1148	+	} catch (IllegalArgumentException success) {}
1149	+	}
1150	+
1151	+	/**
1152	+	* hasWaiters throws IMSE if not locked
1153	+	*/
1154	+	public void testHasWaitersIMSE() {
1155	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1156	+	final Condition c = lock.writeLock().newCondition();
1157	+	try {
1158	+	lock.hasWaiters(c);
1159	+	shouldThrow();
1160	+	} catch (IllegalMonitorStateException success) {}
1161	+	}
1162	+
1163	+
1164	+	/**
1165	+	* getWaitQueueLength throws IAE if not owned
1166	+	*/
1167	+	public void testGetWaitQueueLengthIAE() {
1168	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1169	+	final Condition c = lock.writeLock().newCondition();
1170	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1171	+	try {
1172	+	lock2.getWaitQueueLength(c);
1173	+	shouldThrow();
1174	+	} catch (IllegalArgumentException success) {}
1175	+	}
1176	+
1177	+	/**
1178	+	* getWaitQueueLength throws IMSE if not locked
1179	+	*/
1180	+	public void testGetWaitQueueLengthIMSE() {
1181	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1182	+	final Condition c = lock.writeLock().newCondition();
1183	+	try {
1184	+	lock.getWaitQueueLength(c);
1185	+	shouldThrow();
1186	+	} catch (IllegalMonitorStateException success) {}
1187	+	}
1188	+
1189	+
1190	+	/**
1191	+	* getWaitingThreads throws IAE if not owned
1192	+	*/
1193	+	public void testGetWaitingThreadsIAE() {
1194	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1195	+	final Condition c = lock.writeLock().newCondition();
1196	+	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1197	+	try {
1198	+	lock2.getWaitingThreads(c);
1199	+	shouldThrow();
1200	+	} catch (IllegalArgumentException success) {}
1201	+	}
1202	+
1203	+	/**
1204	+	* getWaitingThreads throws IMSE if not locked
1205	+	*/
1206	+	public void testGetWaitingThreadsIMSE() {
1207	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1208	+	final Condition c = lock.writeLock().newCondition();
1209	+	try {
1210	+	lock.getWaitingThreads(c);
1211	+	shouldThrow();
1212	+	} catch (IllegalMonitorStateException success) {}
1213	+	}
1214	+
1215	+
1216	+	/**
1217	+	* hasWaiters returns true when a thread is waiting, else false
1218	+	*/
1219	+	public void testHasWaiters() throws InterruptedException {
1220	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1221	+	final Condition c = lock.writeLock().newCondition();
1222	+	Thread t = new Thread(new CheckedRunnable() {
1223	+	public void realRun() throws InterruptedException {
1224	+	lock.writeLock().lock();
1225	+	threadAssertFalse(lock.hasWaiters(c));
1226	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1227	+	c.await();
1228	+	lock.writeLock().unlock();
1229	+	}});
1230	+
1231	+	t.start();
1232	+	Thread.sleep(SHORT_DELAY_MS);
1233	+	lock.writeLock().lock();
1234	+	assertTrue(lock.hasWaiters(c));
1235	+	assertEquals(1, lock.getWaitQueueLength(c));
1236	+	c.signal();
1237	+	lock.writeLock().unlock();
1238	+	Thread.sleep(SHORT_DELAY_MS);
1239	+	lock.writeLock().lock();
1240	+	assertFalse(lock.hasWaiters(c));
1241	+	assertEquals(0, lock.getWaitQueueLength(c));
1242	+	lock.writeLock().unlock();
1243	+	t.join(SHORT_DELAY_MS);
1244	+	assertFalse(t.isAlive());
1245	+	}
1246	+
1247	+	/**
1248	+	* getWaitQueueLength returns number of waiting threads
1249	+	*/
1250	+	public void testGetWaitQueueLength() throws InterruptedException {
1251	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1252	+	final Condition c = lock.writeLock().newCondition();
1253	+	Thread t = new Thread(new CheckedRunnable() {
1254	+	public void realRun() throws InterruptedException {
1255	+	lock.writeLock().lock();
1256	+	threadAssertFalse(lock.hasWaiters(c));
1257	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1258	+	c.await();
1259	+	lock.writeLock().unlock();
1260	+	}});
1261	+
1262	+	t.start();
1263	+	Thread.sleep(SHORT_DELAY_MS);
1264	+	lock.writeLock().lock();
1265	+	assertTrue(lock.hasWaiters(c));
1266	+	assertEquals(1, lock.getWaitQueueLength(c));
1267	+	c.signal();
1268	+	lock.writeLock().unlock();
1269	+	Thread.sleep(SHORT_DELAY_MS);
1270	+	lock.writeLock().lock();
1271	+	assertFalse(lock.hasWaiters(c));
1272	+	assertEquals(0, lock.getWaitQueueLength(c));
1273	+	lock.writeLock().unlock();
1274	+	t.join(SHORT_DELAY_MS);
1275	+	assertFalse(t.isAlive());
1276	+	}
1277	+
1278	+
1279	+	/**
1280	+	* getWaitingThreads returns only and all waiting threads
1281	+	*/
1282	+	public void testGetWaitingThreads() throws InterruptedException {
1283	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1284	+	final Condition c = lock.writeLock().newCondition();
1285	+	Thread t1 = new Thread(new CheckedRunnable() {
1286	+	public void realRun() throws InterruptedException {
1287	+	lock.writeLock().lock();
1288	+	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1289	+	c.await();
1290	+	lock.writeLock().unlock();
1291	+	}});
1292	+
1293	+	Thread t2 = new Thread(new CheckedRunnable() {
1294	+	public void realRun() throws InterruptedException {
1295	+	lock.writeLock().lock();
1296	+	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1297	+	c.await();
1298	+	lock.writeLock().unlock();
1299	+	}});
1300	+
1301	+	lock.writeLock().lock();
1302	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1303	+	lock.writeLock().unlock();
1304	+	t1.start();
1305	+	Thread.sleep(SHORT_DELAY_MS);
1306	+	t2.start();
1307	+	Thread.sleep(SHORT_DELAY_MS);
1308	+	lock.writeLock().lock();
1309	+	assertTrue(lock.hasWaiters(c));
1310	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1311	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1312	+	c.signalAll();
1313	+	lock.writeLock().unlock();
1314	+	Thread.sleep(SHORT_DELAY_MS);
1315	+	lock.writeLock().lock();
1316	+	assertFalse(lock.hasWaiters(c));
1317	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1318	+	lock.writeLock().unlock();
1319	+	t1.join(SHORT_DELAY_MS);
1320	+	t2.join(SHORT_DELAY_MS);
1321	+	assertFalse(t1.isAlive());
1322	+	assertFalse(t2.isAlive());
1323	+	}
1324	+
1325	+	/**
1326	+	* toString indicates current lock state
1327	+	*/
1328	+	public void testToString() {
1329	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1330	+	String us = lock.toString();
1331	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1332	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1333	+	lock.writeLock().lock();
1334	+	String ws = lock.toString();
1335	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1336	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1337	+	lock.writeLock().unlock();
1338	+	lock.readLock().lock();
1339	+	lock.readLock().lock();
1340	+	String rs = lock.toString();
1341	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1342	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1343	+	}
1344	+
1345	+	/**
1346	+	* readLock.toString indicates current lock state
1347	+	*/
1348	+	public void testReadLockToString() {
1349	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1350	+	String us = lock.readLock().toString();
1351	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1352	+	lock.readLock().lock();
1353	+	lock.readLock().lock();
1354	+	String rs = lock.readLock().toString();
1355	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1356	+	}
1357	+
1358	+	/**
1359	+	* writeLock.toString indicates current lock state
1360	+	*/
1361	+	public void testWriteLockToString() {
1362	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1363	+	String us = lock.writeLock().toString();
1364	+	assertTrue(us.indexOf("Unlocked") >= 0);
1365	+	lock.writeLock().lock();
1366	+	String ls = lock.writeLock().toString();
1367	+	assertTrue(ls.indexOf("Locked") >= 0);
1368	+	}
1369
1370		}

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