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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 1.46 by jsr166, Mon May 2 00:03:34 2011 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
2	>	* Written by Doug Lea with assistance from members of JCP JSR-166
3	>	* Expert Group and released to the public domain, as explained at
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9		import junit.framework.*;
10		import java.util.concurrent.locks.*;
11		import java.util.concurrent.*;
12	+	import static java.util.concurrent.TimeUnit.MILLISECONDS;
13		import java.io.*;
14	+	import java.util.*;
15
16		public class ReentrantReadWriteLockTest extends JSR166TestCase {
17		public static void main(String[] args) {
18	<	junit.textui.TestRunner.run (suite());
18	>	junit.textui.TestRunner.run(suite());
19		}
20		public static Test suite() {
21	<	return new TestSuite(ReentrantReadWriteLockTest.class);
21	>	return new TestSuite(ReentrantReadWriteLockTest.class);
22	>	}
23	>
24	>	/**
25	>	* A runnable calling lockInterruptibly
26	>	*/
27	>	class InterruptibleLockRunnable extends CheckedRunnable {
28	>	final ReentrantReadWriteLock lock;
29	>	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
30	>	public void realRun() throws InterruptedException {
31	>	lock.writeLock().lockInterruptibly();
32	>	}
33		}
34
21	–	static int HOLD_COUNT_TEST_LIMIT = 20;
35
36	<	/*
37	<	* Unlocks an unlocked lock, throws Illegal Monitor State
38	<	*
36	>	/**
37	>	* A runnable calling lockInterruptibly that expects to be
38	>	* interrupted
39		*/
40	<	public void testIllegalMonitorStateException(){
41	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
42	<	try{
43	<	rl.writeLock().unlock();
44	<	fail("Should of thown Illegal Monitor State Exception");
40	>	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
41	>	final ReentrantReadWriteLock lock;
42	>	InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
43	>	public void realRun() throws InterruptedException {
44	>	lock.writeLock().lockInterruptibly();
45	>	}
46	>	}
47
48	<	}catch(IllegalMonitorStateException success){}
48	>	/**
49	>	* Subclass to expose protected methods
50	>	*/
51	>	static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
52	>	PublicReentrantReadWriteLock() { super(); }
53	>	public Collection<Thread> getQueuedThreads() {
54	>	return super.getQueuedThreads();
55	>	}
56	>	public Collection<Thread> getWaitingThreads(Condition c) {
57	>	return super.getWaitingThreads(c);
58	>	}
59		}
60
61	+	/**
62	+	* Releases lock, checking that it had a hold count of 1.
63	+	*/
64	+	void releaseLock(ReentrantReadWriteLock.WriteLock lock) {
65	+	assertTrue(lock.isHeldByCurrentThread());
66	+	lock.unlock();
67	+	assertFalse(lock.isHeldByCurrentThread());
68	+	}
69
70	+	/**
71	+	* Constructor sets given fairness, and is in unlocked state
72	+	*/
73	+	public void testConstructor() {
74	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
75	+	assertFalse(rl.isFair());
76	+	assertFalse(rl.isWriteLocked());
77	+	assertEquals(0, rl.getReadLockCount());
78	+	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
79	+	assertTrue(r2.isFair());
80	+	assertFalse(r2.isWriteLocked());
81	+	assertEquals(0, r2.getReadLockCount());
82	+	ReentrantReadWriteLock r3 = new ReentrantReadWriteLock(false);
83	+	assertFalse(r3.isFair());
84	+	assertFalse(r3.isWriteLocked());
85	+	assertEquals(0, r3.getReadLockCount());
86	+	}
87
88	<	public void testInterruptedException(){
89	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
90	<	lock.writeLock().lock();
91	<	Thread t = new Thread(new Runnable() {
92	<	public void run(){
93	<	try{
94	<	lock.writeLock().lockInterruptibly();
95	<	threadFail("should throw");
96	<	}catch(InterruptedException success){}
97	<	}
98	<	});
99	<	try {
100	<	t.start();
101	<	t.interrupt();
102	<	lock.writeLock().unlock();
103	<	t.join();
104	<	} catch(Exception e){
105	<	fail("unexpected exception");
106	<	}
107	<	}
108	<
109	<	public void testInterruptedException2(){
110	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
61	<	lock.writeLock().lock();
62	<	Thread t = new Thread(new Runnable() {
63	<	public void run(){
64	<	try{
65	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
66	<	threadFail("should throw");
67	<	}catch(InterruptedException success){}
68	<	}
69	<	});
70	<	try {
71	<	t.start();
72	<	t.interrupt();
73	<	lock.writeLock().unlock();
74	<	t.join();
75	<	} catch(Exception e){
76	<	fail("unexpected exception");
77	<	}
88	>	/**
89	>	* write-locking and read-locking an unlocked lock succeed
90	>	*/
91	>	public void testLock() {
92	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
93	>	rl.writeLock().lock();
94	>	assertTrue(rl.isWriteLocked());
95	>	assertTrue(rl.isWriteLockedByCurrentThread());
96	>	assertTrue(rl.writeLock().isHeldByCurrentThread());
97	>	assertEquals(0, rl.getReadLockCount());
98	>	rl.writeLock().unlock();
99	>	assertFalse(rl.isWriteLocked());
100	>	assertFalse(rl.isWriteLockedByCurrentThread());
101	>	assertFalse(rl.writeLock().isHeldByCurrentThread());
102	>	assertEquals(0, rl.getReadLockCount());
103	>	rl.readLock().lock();
104	>	assertFalse(rl.isWriteLocked());
105	>	assertFalse(rl.isWriteLockedByCurrentThread());
106	>	assertEquals(1, rl.getReadLockCount());
107	>	rl.readLock().unlock();
108	>	assertFalse(rl.isWriteLocked());
109	>	assertFalse(rl.isWriteLockedByCurrentThread());
110	>	assertEquals(0, rl.getReadLockCount());
111		}
112
113	<	public void testInterruptedException3(){
114	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
115	<	lock.writeLock().lock();
116	<	Thread t = new Thread(new Runnable() {
117	<	public void run(){
118	<	try{
119	<	lock.readLock().lockInterruptibly();
120	<	threadFail("should throw");
121	<	}catch(InterruptedException success){}
122	<	}
123	<	});
124	<	try {
125	<	t.start();
126	<	t.interrupt();
127	<	lock.writeLock().unlock();
128	<	t.join();
129	<	} catch(Exception e){
130	<	fail("unexpected exception");
131	<	}
132	<	}
133	<
134	<	public void testInterruptedException4(){
135	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
136	<	lock.writeLock().lock();
104	<	Thread t = new Thread(new Runnable() {
105	<	public void run(){
106	<	try{
107	<	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
108	<	threadFail("should throw");
109	<	}catch(InterruptedException success){}
110	<	}
111	<	});
112	<	try {
113	<	t.start();
114	<	t.interrupt();
115	<	t.join();
116	<	} catch(Exception e){
117	<	fail("unexpected exception");
118	<	}
113	>
114	>	/**
115	>	* locking an unlocked fair lock succeeds
116	>	*/
117	>	public void testFairLock() {
118	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
119	>	rl.writeLock().lock();
120	>	assertTrue(rl.isWriteLocked());
121	>	assertTrue(rl.isWriteLockedByCurrentThread());
122	>	assertTrue(rl.writeLock().isHeldByCurrentThread());
123	>	assertEquals(0, rl.getReadLockCount());
124	>	rl.writeLock().unlock();
125	>	assertFalse(rl.isWriteLocked());
126	>	assertFalse(rl.isWriteLockedByCurrentThread());
127	>	assertFalse(rl.writeLock().isHeldByCurrentThread());
128	>	assertEquals(0, rl.getReadLockCount());
129	>	rl.readLock().lock();
130	>	assertFalse(rl.isWriteLocked());
131	>	assertFalse(rl.isWriteLockedByCurrentThread());
132	>	assertEquals(1, rl.getReadLockCount());
133	>	rl.readLock().unlock();
134	>	assertFalse(rl.isWriteLocked());
135	>	assertFalse(rl.isWriteLockedByCurrentThread());
136	>	assertEquals(0, rl.getReadLockCount());
137		}
138
139	<
140	<	public void testTryLockWhenLocked() {
141	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
142	<	lock.writeLock().lock();
143	<	Thread t = new Thread(new Runnable() {
144	<	public void run(){
145	<	threadAssertFalse(lock.writeLock().tryLock());
146	<	}
147	<	});
148	<	try {
131	<	t.start();
132	<	t.join();
139	>	/**
140	>	* getWriteHoldCount returns number of recursive holds
141	>	*/
142	>	public void testGetWriteHoldCount() {
143	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
144	>	for (int i = 1; i <= SIZE; i++) {
145	>	lock.writeLock().lock();
146	>	assertEquals(i,lock.getWriteHoldCount());
147	>	}
148	>	for (int i = SIZE; i > 0; i--) {
149		lock.writeLock().unlock();
150	<	} catch(Exception e){
135	<	fail("unexpected exception");
150	>	assertEquals(i-1,lock.getWriteHoldCount());
151		}
152	<	}
152	>	}
153
154	<	public void testTryLockWhenLocked2() {
155	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
156	<	lock.writeLock().lock();
157	<	Thread t = new Thread(new Runnable() {
158	<	public void run(){
159	<	threadAssertFalse(lock.readLock().tryLock());
160	<	}
161	<	});
162	<	try {
163	<	t.start();
149	<	t.join();
154	>	/**
155	>	* WriteLock.getHoldCount returns number of recursive holds
156	>	*/
157	>	public void testGetHoldCount() {
158	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
159	>	for (int i = 1; i <= SIZE; i++) {
160	>	lock.writeLock().lock();
161	>	assertEquals(i,lock.writeLock().getHoldCount());
162	>	}
163	>	for (int i = SIZE; i > 0; i--) {
164		lock.writeLock().unlock();
165	<	} catch(Exception e){
152	<	fail("unexpected exception");
165	>	assertEquals(i-1,lock.writeLock().getHoldCount());
166		}
167	<	}
167	>	}
168
169	<	public void testMultipleReadLocks() {
170	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
171	<	lock.readLock().lock();
172	<	Thread t = new Thread(new Runnable() {
173	<	public void run(){
174	<	threadAssertTrue(lock.readLock().tryLock());
175	<	lock.readLock().unlock();
176	<	}
164	<	});
165	<	try {
166	<	t.start();
167	<	t.join();
168	<	lock.readLock().unlock();
169	<	} catch(Exception e){
170	<	fail("unexpected exception");
169	>	/**
170	>	* getReadHoldCount returns number of recursive holds
171	>	*/
172	>	public void testGetReadHoldCount() {
173	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
174	>	for (int i = 1; i <= SIZE; i++) {
175	>	lock.readLock().lock();
176	>	assertEquals(i,lock.getReadHoldCount());
177		}
178	<	}
173	<
174	<	public void testWriteAfterMultipleReadLocks() {
175	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
176	<	lock.readLock().lock();
177	<	Thread t1 = new Thread(new Runnable() {
178	<	public void run(){
179	<	lock.readLock().lock();
180	<	lock.readLock().unlock();
181	<	}
182	<	});
183	<	Thread t2 = new Thread(new Runnable() {
184	<	public void run(){
185	<	lock.writeLock().lock();
186	<	lock.writeLock().unlock();
187	<	}
188	<	});
189	<
190	<	try {
191	<	t1.start();
192	<	t2.start();
193	<	Thread.sleep(SHORT_DELAY_MS);
194	<	lock.readLock().unlock();
195	<	t1.join(MEDIUM_DELAY_MS);
196	<	t2.join(MEDIUM_DELAY_MS);
197	<	assertTrue(!t1.isAlive());
198	<	assertTrue(!t2.isAlive());
199	<
200	<	} catch(Exception e){
201	<	fail("unexpected exception");
202	<	}
203	<	}
204	<
205	<	public void testReadAfterWriteLock() {
206	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
207	<	lock.writeLock().lock();
208	<	Thread t1 = new Thread(new Runnable() {
209	<	public void run(){
210	<	lock.readLock().lock();
211	<	lock.readLock().unlock();
212	<	}
213	<	});
214	<	Thread t2 = new Thread(new Runnable() {
215	<	public void run(){
216	<	lock.readLock().lock();
217	<	lock.readLock().unlock();
218	<	}
219	<	});
220	<
221	<	try {
222	<	t1.start();
223	<	t2.start();
224	<	Thread.sleep(SHORT_DELAY_MS);
225	<	lock.writeLock().unlock();
226	<	t1.join(MEDIUM_DELAY_MS);
227	<	t2.join(MEDIUM_DELAY_MS);
228	<	assertTrue(!t1.isAlive());
229	<	assertTrue(!t2.isAlive());
230	<
231	<	} catch(Exception e){
232	<	fail("unexpected exception");
233	<	}
234	<	}
235	<
236	<
237	<	public void testTryLockWhenReadLocked() {
238	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
239	<	lock.readLock().lock();
240	<	Thread t = new Thread(new Runnable() {
241	<	public void run(){
242	<	threadAssertTrue(lock.readLock().tryLock());
243	<	lock.readLock().unlock();
244	<	}
245	<	});
246	<	try {
247	<	t.start();
248	<	t.join();
178	>	for (int i = SIZE; i > 0; i--) {
179		lock.readLock().unlock();
180	<	} catch(Exception e){
251	<	fail("unexpected exception");
180	>	assertEquals(i-1,lock.getReadHoldCount());
181		}
182	<	}
182	>	}
183
255	–
184
185	<	public void testWriteTryLockWhenReadLocked() {
186	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
187	<	lock.readLock().lock();
188	<	Thread t = new Thread(new Runnable() {
189	<	public void run(){
262	<	threadAssertFalse(lock.writeLock().tryLock());
263	<	}
264	<	});
185	>	/**
186	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
187	>	*/
188	>	public void testUnlock_IllegalMonitorStateException() {
189	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
190		try {
191	<	t.start();
192	<	t.join();
193	<	lock.readLock().unlock();
194	<	} catch(Exception e){
270	<	fail("unexpected exception");
271	<	}
272	<	}
191	>	rl.writeLock().unlock();
192	>	shouldThrow();
193	>	} catch (IllegalMonitorStateException success) {}
194	>	}
195
274	–
196
197	<	public void testTryLock_Timeout(){
198	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
199	<	lock.writeLock().lock();
200	<	Thread t = new Thread(new Runnable() {
201	<	public void run(){
202	<	try {
203	<	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
204	<	} catch (Exception ex) {
205	<	threadFail("unexpected exception");
206	<	}
207	<	}
208	<	});
209	<	try {
210	<	t.start();
211	<	t.join();
212	<	lock.writeLock().unlock();
292	<	} catch(Exception e){
293	<	fail("unexpected exception");
294	<	}
295	<	}
197	>	/**
198	>	* write-lockInterruptibly is interruptible
199	>	*/
200	>	public void testWriteLockInterruptibly_Interrupted() throws Exception {
201	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
202	>	lock.writeLock().lock();
203	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
204	>	public void realRun() throws InterruptedException {
205	>	lock.writeLock().lockInterruptibly();
206	>	}});
207	>
208	>	Thread.sleep(SHORT_DELAY_MS);
209	>	t.interrupt();
210	>	t.join();
211	>	releaseLock(lock.writeLock());
212	>	}
213
214	<	public void testTryLock_Timeout2(){
215	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
216	<	lock.writeLock().lock();
217	<	Thread t = new Thread(new Runnable() {
218	<	public void run(){
219	<	try {
220	<	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
221	<	} catch (Exception ex) {
222	<	threadFail("unexpected exception");
223	<	}
224	<	}
225	<	});
226	<	try {
227	<	t.start();
228	<	t.join();
229	<	lock.writeLock().unlock();
313	<	} catch(Exception e){
314	<	fail("unexpected exception");
315	<	}
316	<	}
214	>	/**
215	>	* timed write-tryLock is interruptible
216	>	*/
217	>	public void testWriteTryLock_Interrupted() throws InterruptedException {
218	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
219	>	lock.writeLock().lock();
220	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
221	>	public void realRun() throws InterruptedException {
222	>	lock.writeLock().tryLock(SMALL_DELAY_MS, MILLISECONDS);
223	>	}});
224	>
225	>	Thread.sleep(SHORT_DELAY_MS);
226	>	t.interrupt();
227	>	lock.writeLock().unlock();
228	>	t.join();
229	>	}
230
231	+	/**
232	+	* read-lockInterruptibly is interruptible
233	+	*/
234	+	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
235	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
236	+	lock.writeLock().lock();
237	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
238	+	public void realRun() throws InterruptedException {
239	+	lock.readLock().lockInterruptibly();
240	+	}});
241	+
242	+	Thread.sleep(SHORT_DELAY_MS);
243	+	t.interrupt();
244	+	Thread.sleep(SHORT_DELAY_MS);
245	+	lock.writeLock().unlock();
246	+	t.join();
247	+	}
248
249	<	public void testLockInterruptibly() {
250	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
251	<	try {
252	<	lock.writeLock().lockInterruptibly();
253	<	} catch(Exception e) {
254	<	fail("unexpected exception");
255	<	}
256	<	Thread t = new Thread(new Runnable() {
257	<	public void run() {
258	<	try {
259	<	lock.writeLock().lockInterruptibly();
260	<	threadFail("should throw");
261	<	}
262	<	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	<	}
249	>	/**
250	>	* timed read-tryLock is interruptible
251	>	*/
252	>	public void testReadTryLock_Interrupted() throws InterruptedException {
253	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
254	>	lock.writeLock().lock();
255	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
256	>	public void realRun() throws InterruptedException {
257	>	lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS);
258	>	}});
259	>
260	>	Thread.sleep(SHORT_DELAY_MS);
261	>	t.interrupt();
262	>	t.join();
263		}
264
265	<	public void testLockInterruptibly2() {
266	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
267	<	try {
268	<	lock.writeLock().lockInterruptibly();
269	<	} catch(Exception e) {
270	<	fail("unexpected exception");
271	<	}
272	<	Thread t = new Thread(new Runnable() {
273	<	public void run() {
274	<	try {
275	<	lock.readLock().lockInterruptibly();
276	<	threadFail("should throw");
277	<	}
278	<	catch(InterruptedException success) {
279	<	}
280	<	}
281	<	});
282	<	try {
283	<	t.start();
284	<	t.interrupt();
285	<	t.join();
286	<	lock.writeLock().unlock();
287	<	} catch(Exception e){
288	<	fail("unexpected exception");
289	<	}
265	>
266	>	/**
267	>	* write-tryLock fails if locked
268	>	*/
269	>	public void testWriteTryLockWhenLocked() throws InterruptedException {
270	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
271	>	lock.writeLock().lock();
272	>	Thread t = newStartedThread(new CheckedRunnable() {
273	>	public void realRun() {
274	>	assertFalse(lock.writeLock().tryLock());
275	>	}});
276	>
277	>	t.join();
278	>	lock.writeLock().unlock();
279	>	}
280	>
281	>	/**
282	>	* read-tryLock fails if locked
283	>	*/
284	>	public void testReadTryLockWhenLocked() throws InterruptedException {
285	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
286	>	lock.writeLock().lock();
287	>	Thread t = newStartedThread(new CheckedRunnable() {
288	>	public void realRun() {
289	>	assertFalse(lock.readLock().tryLock());
290	>	}});
291	>
292	>	t.join();
293	>	lock.writeLock().unlock();
294	>	}
295	>
296	>	/**
297	>	* Multiple threads can hold a read lock when not write-locked
298	>	*/
299	>	public void testMultipleReadLocks() throws InterruptedException {
300	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
301	>	lock.readLock().lock();
302	>	Thread t = newStartedThread(new CheckedRunnable() {
303	>	public void realRun() {
304	>	assertTrue(lock.readLock().tryLock());
305	>	lock.readLock().unlock();
306	>	}});
307	>
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 = newStartedThread(new CheckedRunnable() {
319	>	public void realRun() {
320	>	lock.readLock().lock();
321	>	lock.readLock().unlock();
322	>	}});
323	>	Thread t2 = newStartedThread(new CheckedRunnable() {
324	>	public void realRun() {
325	>	lock.writeLock().lock();
326	>	lock.writeLock().unlock();
327	>	}});
328	>
329	>	Thread.sleep(SHORT_DELAY_MS);
330	>	lock.readLock().unlock();
331	>	t1.join(MEDIUM_DELAY_MS);
332	>	t2.join(MEDIUM_DELAY_MS);
333	>	assertTrue(!t1.isAlive());
334	>	assertTrue(!t2.isAlive());
335	>	}
336	>
337	>	/**
338	>	* Readlocks succeed after a writing thread unlocks
339	>	*/
340	>	public void testReadAfterWriteLock() throws InterruptedException {
341	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
342	>	lock.writeLock().lock();
343	>	Thread t1 = newStartedThread(new CheckedRunnable() {
344	>	public void realRun() {
345	>	lock.readLock().lock();
346	>	lock.readLock().unlock();
347	>	}});
348	>	Thread t2 = newStartedThread(new CheckedRunnable() {
349	>	public void realRun() {
350	>	lock.readLock().lock();
351	>	lock.readLock().unlock();
352	>	}});
353	>
354	>	Thread.sleep(SHORT_DELAY_MS);
355	>	lock.writeLock().unlock();
356	>	t1.join(MEDIUM_DELAY_MS);
357	>	t2.join(MEDIUM_DELAY_MS);
358	>	assertTrue(!t1.isAlive());
359	>	assertTrue(!t2.isAlive());
360	>	}
361	>
362	>	/**
363	>	* Read trylock succeeds if write locked by current thread
364	>	*/
365	>	public void testReadHoldingWriteLock() {
366	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
367	>	lock.writeLock().lock();
368	>	assertTrue(lock.readLock().tryLock());
369	>	lock.readLock().unlock();
370	>	lock.writeLock().unlock();
371	>	}
372	>
373	>	/**
374	>	* Read lock succeeds if write locked by current thread even if
375	>	* other threads are waiting for readlock
376	>	*/
377	>	public void testReadHoldingWriteLock2() throws InterruptedException {
378	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
379	>	lock.writeLock().lock();
380	>	Thread t1 = newStartedThread(new CheckedRunnable() {
381	>	public void realRun() {
382	>	lock.readLock().lock();
383	>	lock.readLock().unlock();
384	>	}});
385	>	Thread t2 = newStartedThread(new CheckedRunnable() {
386	>	public void realRun() {
387	>	lock.readLock().lock();
388	>	lock.readLock().unlock();
389	>	}});
390	>
391	>	lock.readLock().lock();
392	>	lock.readLock().unlock();
393	>	Thread.sleep(SHORT_DELAY_MS);
394	>	lock.readLock().lock();
395	>	lock.readLock().unlock();
396	>	lock.writeLock().unlock();
397	>	t1.join(MEDIUM_DELAY_MS);
398	>	t2.join(MEDIUM_DELAY_MS);
399	>	assertTrue(!t1.isAlive());
400	>	assertTrue(!t2.isAlive());
401	>	}
402	>
403	>	/**
404	>	* Read lock succeeds if write locked by current thread even if
405	>	* other threads are waiting for writelock
406	>	*/
407	>	public void testReadHoldingWriteLock3() throws InterruptedException {
408	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
409	>	lock.writeLock().lock();
410	>	Thread t1 = newStartedThread(new CheckedRunnable() {
411	>	public void realRun() {
412	>	lock.writeLock().lock();
413	>	lock.writeLock().unlock();
414	>	}});
415	>	Thread t2 = newStartedThread(new CheckedRunnable() {
416	>	public void realRun() {
417	>	lock.writeLock().lock();
418	>	lock.writeLock().unlock();
419	>	}});
420	>
421	>	lock.readLock().lock();
422	>	lock.readLock().unlock();
423	>	Thread.sleep(SHORT_DELAY_MS);
424	>	lock.readLock().lock();
425	>	lock.readLock().unlock();
426	>	lock.writeLock().unlock();
427	>	t1.join(MEDIUM_DELAY_MS);
428	>	t2.join(MEDIUM_DELAY_MS);
429	>	assertTrue(!t1.isAlive());
430	>	assertTrue(!t2.isAlive());
431	>	}
432	>
433	>
434	>	/**
435	>	* Write lock succeeds if write locked by current thread even if
436	>	* other threads are waiting for writelock
437	>	*/
438	>	public void testWriteHoldingWriteLock4() throws InterruptedException {
439	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
440	>	lock.writeLock().lock();
441	>	Thread t1 = newStartedThread(new CheckedRunnable() {
442	>	public void realRun() {
443	>	lock.writeLock().lock();
444	>	lock.writeLock().unlock();
445	>	}});
446	>	Thread t2 = newStartedThread(new CheckedRunnable() {
447	>	public void realRun() {
448	>	lock.writeLock().lock();
449	>	lock.writeLock().unlock();
450	>	}});
451	>
452	>	lock.writeLock().lock();
453	>	lock.writeLock().unlock();
454	>	Thread.sleep(SHORT_DELAY_MS);
455	>	lock.writeLock().lock();
456	>	lock.writeLock().unlock();
457	>	lock.writeLock().unlock();
458	>	t1.join(MEDIUM_DELAY_MS);
459	>	t2.join(MEDIUM_DELAY_MS);
460	>	assertTrue(!t1.isAlive());
461	>	assertTrue(!t2.isAlive());
462	>	}
463	>
464	>
465	>	/**
466	>	* Fair Read trylock succeeds if write locked by current thread
467	>	*/
468	>	public void testReadHoldingWriteLockFair() {
469	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
470	>	lock.writeLock().lock();
471	>	assertTrue(lock.readLock().tryLock());
472	>	lock.readLock().unlock();
473	>	lock.writeLock().unlock();
474	>	}
475	>
476	>	/**
477	>	* Fair Read lock succeeds if write locked by current thread even if
478	>	* other threads are waiting for readlock
479	>	*/
480	>	public void testReadHoldingWriteLockFair2() throws InterruptedException {
481	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
482	>	lock.writeLock().lock();
483	>	Thread t1 = newStartedThread(new CheckedRunnable() {
484	>	public void realRun() {
485	>	lock.readLock().lock();
486	>	lock.readLock().unlock();
487	>	}});
488	>	Thread t2 = newStartedThread(new CheckedRunnable() {
489	>	public void realRun() {
490	>	lock.readLock().lock();
491	>	lock.readLock().unlock();
492	>	}});
493	>
494	>	lock.readLock().lock();
495	>	lock.readLock().unlock();
496	>	Thread.sleep(SHORT_DELAY_MS);
497	>	lock.readLock().lock();
498	>	lock.readLock().unlock();
499	>	lock.writeLock().unlock();
500	>	t1.join(MEDIUM_DELAY_MS);
501	>	t2.join(MEDIUM_DELAY_MS);
502	>	assertTrue(!t1.isAlive());
503	>	assertTrue(!t2.isAlive());
504	>	}
505	>
506	>
507	>	/**
508	>	* Fair Read lock succeeds if write locked by current thread even if
509	>	* other threads are waiting for writelock
510	>	*/
511	>	public void testReadHoldingWriteLockFair3() throws InterruptedException {
512	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
513	>	lock.writeLock().lock();
514	>	Thread t1 = newStartedThread(new CheckedRunnable() {
515	>	public void realRun() {
516	>	lock.writeLock().lock();
517	>	lock.writeLock().unlock();
518	>	}});
519	>	Thread t2 = newStartedThread(new CheckedRunnable() {
520	>	public void realRun() {
521	>	lock.writeLock().lock();
522	>	lock.writeLock().unlock();
523	>	}});
524	>
525	>	lock.readLock().lock();
526	>	lock.readLock().unlock();
527	>	Thread.sleep(SHORT_DELAY_MS);
528	>	lock.readLock().lock();
529	>	lock.readLock().unlock();
530	>	lock.writeLock().unlock();
531	>	t1.join(MEDIUM_DELAY_MS);
532	>	t2.join(MEDIUM_DELAY_MS);
533	>	assertTrue(!t1.isAlive());
534	>	assertTrue(!t2.isAlive());
535	>	}
536	>
537	>
538	>	/**
539	>	* Fair Write lock succeeds if write locked by current thread even if
540	>	* other threads are waiting for writelock
541	>	*/
542	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
543	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
544	>	lock.writeLock().lock();
545	>	Thread t1 = newStartedThread(new CheckedRunnable() {
546	>	public void realRun() {
547	>	lock.writeLock().lock();
548	>	lock.writeLock().unlock();
549	>	}});
550	>	Thread t2 = newStartedThread(new CheckedRunnable() {
551	>	public void realRun() {
552	>	lock.writeLock().lock();
553	>	lock.writeLock().unlock();
554	>	}});
555	>
556	>	Thread.sleep(SHORT_DELAY_MS);
557	>	assertTrue(lock.isWriteLockedByCurrentThread());
558	>	assertEquals(1, lock.getWriteHoldCount());
559	>	lock.writeLock().lock();
560	>	assertEquals(2, lock.getWriteHoldCount());
561	>	lock.writeLock().unlock();
562	>	lock.writeLock().lock();
563	>	lock.writeLock().unlock();
564	>	lock.writeLock().unlock();
565	>	t1.join(MEDIUM_DELAY_MS);
566	>	t2.join(MEDIUM_DELAY_MS);
567	>	assertTrue(!t1.isAlive());
568	>	assertTrue(!t2.isAlive());
569	>	}
570	>
571	>
572	>	/**
573	>	* Read tryLock succeeds if readlocked but not writelocked
574	>	*/
575	>	public void testTryLockWhenReadLocked() throws InterruptedException {
576	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
577	>	lock.readLock().lock();
578	>	Thread t = newStartedThread(new CheckedRunnable() {
579	>	public void realRun() {
580	>	assertTrue(lock.readLock().tryLock());
581	>	lock.readLock().unlock();
582	>	}});
583	>
584	>	t.join();
585	>	lock.readLock().unlock();
586		}
587
588	<	public void testAwait_IllegalMonitor() {
589	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
588	>	/**
589	>	* write tryLock fails when readlocked
590	>	*/
591	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
592	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
593	>	lock.readLock().lock();
594	>	Thread t = newStartedThread(new CheckedRunnable() {
595	>	public void realRun() {
596	>	assertFalse(lock.writeLock().tryLock());
597	>	}});
598	>
599	>	t.join();
600	>	lock.readLock().unlock();
601	>	}
602	>
603	>
604	>	/**
605	>	* Fair Read tryLock succeeds if readlocked but not writelocked
606	>	*/
607	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
608	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
609	>	lock.readLock().lock();
610	>	Thread t = newStartedThread(new CheckedRunnable() {
611	>	public void realRun() {
612	>	assertTrue(lock.readLock().tryLock());
613	>	lock.readLock().unlock();
614	>	}});
615	>
616	>	t.join();
617	>	lock.readLock().unlock();
618	>	}
619	>
620	>
621	>
622	>	/**
623	>	* Fair write tryLock fails when readlocked
624	>	*/
625	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
626	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
627	>	lock.readLock().lock();
628	>	Thread t = newStartedThread(new CheckedRunnable() {
629	>	public void realRun() {
630	>	assertFalse(lock.writeLock().tryLock());
631	>	}});
632	>
633	>	t.join();
634	>	lock.readLock().unlock();
635	>	}
636	>
637	>
638	>
639	>	/**
640	>	* write timed tryLock times out if locked
641	>	*/
642	>	public void testWriteTryLock_Timeout() throws InterruptedException {
643	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
644	>	lock.writeLock().lock();
645	>	Thread t = newStartedThread(new CheckedRunnable() {
646	>	public void realRun() throws InterruptedException {
647	>	assertFalse(lock.writeLock().tryLock(1, MILLISECONDS));
648	>	}});
649	>
650	>	t.join();
651	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
652	>	lock.writeLock().unlock();
653	>	}
654	>
655	>	/**
656	>	* read timed tryLock times out if write-locked
657	>	*/
658	>	public void testReadTryLock_Timeout() throws InterruptedException {
659	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
660	>	lock.writeLock().lock();
661	>	Thread t = newStartedThread(new CheckedRunnable() {
662	>	public void realRun() throws InterruptedException {
663	>	assertFalse(lock.readLock().tryLock(1, MILLISECONDS));
664	>	}});
665	>
666	>	t.join();
667	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
668	>	lock.writeLock().unlock();
669	>	}
670	>
671	>
672	>	/**
673	>	* write lockInterruptibly succeeds if lock free else is interruptible
674	>	*/
675	>	public void testWriteLockInterruptibly() throws InterruptedException {
676	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
677	>	lock.writeLock().lockInterruptibly();
678	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
679	>	public void realRun() throws InterruptedException {
680	>	lock.writeLock().lockInterruptibly();
681	>	}});
682	>
683	>	Thread.sleep(SHORT_DELAY_MS);
684	>	t.interrupt();
685	>	Thread.sleep(SHORT_DELAY_MS);
686	>	t.join();
687	>	lock.writeLock().unlock();
688	>	}
689	>
690	>	/**
691	>	* read lockInterruptibly succeeds if lock free else is interruptible
692	>	*/
693	>	public void testReadLockInterruptibly() throws InterruptedException {
694	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
695	>	lock.writeLock().lockInterruptibly();
696	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
697	>	public void realRun() throws InterruptedException {
698	>	lock.readLock().lockInterruptibly();
699	>	}});
700	>
701	>	Thread.sleep(SHORT_DELAY_MS);
702	>	t.interrupt();
703	>	t.join();
704	>	lock.writeLock().unlock();
705	>	}
706	>
707	>	/**
708	>	* Calling await without holding lock throws IllegalMonitorStateException
709	>	*/
710	>	public void testAwait_IllegalMonitor() throws InterruptedException {
711	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
712		final Condition c = lock.writeLock().newCondition();
713		try {
714		c.await();
715	<	fail("should throw");
716	<	}
380	<	catch (IllegalMonitorStateException success) {
381	<	}
382	<	catch (Exception ex) {
383	<	fail("should throw IMSE");
384	<	}
715	>	shouldThrow();
716	>	} catch (IllegalMonitorStateException success) {}
717		}
718
719	+	/**
720	+	* Calling signal without holding lock throws IllegalMonitorStateException
721	+	*/
722		public void testSignal_IllegalMonitor() {
723	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
723	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
724		final Condition c = lock.writeLock().newCondition();
725		try {
726		c.signal();
727	<	fail("should throw");
728	<	}
394	<	catch (IllegalMonitorStateException success) {
395	<	}
396	<	catch (Exception ex) {
397	<	fail("should throw IMSE");
398	<	}
727	>	shouldThrow();
728	>	} catch (IllegalMonitorStateException success) {}
729		}
730
731	<	public void testAwaitNanos_Timeout() {
732	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
731	>	/**
732	>	* awaitNanos without a signal times out
733	>	*/
734	>	public void testAwaitNanos_Timeout() throws InterruptedException {
735	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
736		final Condition c = lock.writeLock().newCondition();
737	<	try {
738	<	lock.writeLock().lock();
739	<	long t = c.awaitNanos(100);
740	<	assertTrue(t <= 0);
741	<	lock.writeLock().unlock();
409	<	}
410	<	catch (Exception ex) {
411	<	fail("unexpected exception");
412	<	}
737	>
738	>	lock.writeLock().lock();
739	>	long t = c.awaitNanos(100);
740	>	assertTrue(t <= 0);
741	>	lock.writeLock().unlock();
742		}
743
744	<	public void testAwait_Timeout() {
745	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
744	>
745	>	/**
746	>	* timed await without a signal times out
747	>	*/
748	>	public void testAwait_Timeout() throws InterruptedException {
749	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
750		final Condition c = lock.writeLock().newCondition();
751	<	try {
752	<	lock.writeLock().lock();
753	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
421	<	lock.writeLock().unlock();
422	<	}
423	<	catch (Exception ex) {
424	<	fail("unexpected exception");
425	<	}
751	>	lock.writeLock().lock();
752	>	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
753	>	lock.writeLock().unlock();
754		}
755
756	<	public void testAwaitUntil_Timeout() {
757	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
756	>	/**
757	>	* awaitUntil without a signal times out
758	>	*/
759	>	public void testAwaitUntil_Timeout() throws InterruptedException {
760	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
761		final Condition c = lock.writeLock().newCondition();
762	<	try {
763	<	lock.writeLock().lock();
764	<	java.util.Date d = new java.util.Date();
765	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
435	<	lock.writeLock().unlock();
436	<	}
437	<	catch (Exception ex) {
438	<	fail("unexpected exception");
439	<	}
762	>	lock.writeLock().lock();
763	>	java.util.Date d = new java.util.Date();
764	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
765	>	lock.writeLock().unlock();
766		}
767
768	<	public void testAwait() {
769	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
768	>	/**
769	>	* await returns when signalled
770	>	*/
771	>	public void testAwait() throws InterruptedException {
772	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
773		final Condition c = lock.writeLock().newCondition();
774	<	Thread t = new Thread(new Runnable() {
775	<	public void run() {
776	<	try {
777	<	lock.writeLock().lock();
778	<	c.await();
779	<	lock.writeLock().unlock();
780	<	}
781	<	catch(InterruptedException e) {
782	<	threadFail("unexpected exception");
783	<	}
784	<	}
785	<	});
774	>	Thread t = newStartedThread(new CheckedRunnable() {
775	>	public void realRun() throws InterruptedException {
776	>	lock.writeLock().lock();
777	>	c.await();
778	>	lock.writeLock().unlock();
779	>	}});
780	>
781	>	Thread.sleep(SHORT_DELAY_MS);
782	>	lock.writeLock().lock();
783	>	c.signal();
784	>	lock.writeLock().unlock();
785	>	t.join(SHORT_DELAY_MS);
786	>	assertFalse(t.isAlive());
787	>	}
788
789	<	try {
790	<	t.start();
791	<	Thread.sleep(SHORT_DELAY_MS);
792	<	lock.writeLock().lock();
793	<	c.signal();
794	<	lock.writeLock().unlock();
795	<	t.join(SHORT_DELAY_MS);
796	<	assertFalse(t.isAlive());
797	<	}
798	<	catch (Exception ex) {
799	<	fail("unexpected exception");
789	>	/** A helper class for uninterruptible wait tests */
790	>	class UninterruptableThread extends Thread {
791	>	private Lock lock;
792	>	private Condition c;
793	>
794	>	public volatile boolean canAwake = false;
795	>	public volatile boolean interrupted = false;
796	>	public volatile boolean lockStarted = false;
797	>
798	>	public UninterruptableThread(Lock lock, Condition c) {
799	>	this.lock = lock;
800	>	this.c = c;
801	>	}
802	>
803	>	public synchronized void run() {
804	>	lock.lock();
805	>	lockStarted = true;
806	>
807	>	while (!canAwake) {
808	>	c.awaitUninterruptibly();
809	>	}
810	>
811	>	interrupted = isInterrupted();
812	>	lock.unlock();
813		}
814		}
815
816	<	public void testAwaitUninterruptibly() {
817	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
816	>	/**
817	>	* awaitUninterruptibly doesn't abort on interrupt
818	>	*/
819	>	public void testAwaitUninterruptibly() throws InterruptedException {
820	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
821		final Condition c = lock.writeLock().newCondition();
822	<	Thread t = new Thread(new Runnable() {
823	<	public void run() {
824	<	lock.writeLock().lock();
478	<	c.awaitUninterruptibly();
479	<	lock.writeLock().unlock();
480	<	}
481	<	});
822	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
823	>
824	>	thread.start();
825
826	+	while (!thread.lockStarted) {
827	+	Thread.sleep(100);
828	+	}
829	+
830	+	lock.writeLock().lock();
831		try {
832	<	t.start();
833	<	Thread.sleep(SHORT_DELAY_MS);
486	<	t.interrupt();
487	<	lock.writeLock().lock();
832	>	thread.interrupt();
833	>	thread.canAwake = true;
834		c.signal();
835	+	} finally {
836		lock.writeLock().unlock();
490	–	t.join(SHORT_DELAY_MS);
491	–	assertFalse(t.isAlive());
492	–	}
493	–	catch (Exception ex) {
494	–	fail("unexpected exception");
837		}
838	+
839	+	thread.join();
840	+	assertTrue(thread.interrupted);
841	+	assertFalse(thread.isAlive());
842		}
843
844	<	public void testAwait_Interrupt() {
845	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
846	<	final Condition c = lock.writeLock().newCondition();
847	<	Thread t = new Thread(new Runnable() {
848	<	public void run() {
849	<	try {
850	<	lock.writeLock().lock();
851	<	c.await();
852	<	lock.writeLock().unlock();
853	<	threadFail("should throw");
854	<	}
855	<	catch(InterruptedException success) {
856	<	}
857	<	}
858	<	});
859	<
860	<	try {
515	<	t.start();
516	<	Thread.sleep(SHORT_DELAY_MS);
517	<	t.interrupt();
518	<	t.join(SHORT_DELAY_MS);
519	<	assertFalse(t.isAlive());
520	<	}
521	<	catch (Exception ex) {
522	<	fail("unexpected exception");
523	<	}
524	<	}
525	<
526	<	public void testAwaitNanos_Interrupt() {
527	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
528	<	final Condition c = lock.writeLock().newCondition();
529	<	Thread t = new Thread(new Runnable() {
530	<	public void run() {
531	<	try {
532	<	lock.writeLock().lock();
533	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
534	<	lock.writeLock().unlock();
535	<	threadFail("should throw");
536	<	}
537	<	catch(InterruptedException success) {
538	<	}
539	<	}
540	<	});
541	<
542	<	try {
543	<	t.start();
544	<	Thread.sleep(SHORT_DELAY_MS);
545	<	t.interrupt();
546	<	t.join(SHORT_DELAY_MS);
547	<	assertFalse(t.isAlive());
548	<	}
549	<	catch (Exception ex) {
550	<	fail("unexpected exception");
551	<	}
552	<	}
553	<
554	<	public void testAwaitUntil_Interrupt() {
555	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
556	<	final Condition c = lock.writeLock().newCondition();
557	<	Thread t = new Thread(new Runnable() {
558	<	public void run() {
559	<	try {
560	<	lock.writeLock().lock();
561	<	java.util.Date d = new java.util.Date();
562	<	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
563	<	lock.writeLock().unlock();
564	<	threadFail("should throw");
565	<	}
566	<	catch(InterruptedException success) {
567	<	}
568	<	}
569	<	});
570	<
571	<	try {
572	<	t.start();
573	<	Thread.sleep(SHORT_DELAY_MS);
574	<	t.interrupt();
575	<	t.join(SHORT_DELAY_MS);
576	<	assertFalse(t.isAlive());
577	<	}
578	<	catch (Exception ex) {
579	<	fail("unexpected exception");
580	<	}
581	<	}
582	<
583	<	public void testSignalAll() {
584	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
585	<	final Condition c = lock.writeLock().newCondition();
586	<	Thread t1 = new Thread(new Runnable() {
587	<	public void run() {
588	<	try {
589	<	lock.writeLock().lock();
590	<	c.await();
591	<	lock.writeLock().unlock();
592	<	}
593	<	catch(InterruptedException e) {
594	<	threadFail("unexpected exception");
595	<	}
596	<	}
597	<	});
598	<
599	<	Thread t2 = new Thread(new Runnable() {
600	<	public void run() {
601	<	try {
602	<	lock.writeLock().lock();
603	<	c.await();
604	<	lock.writeLock().unlock();
605	<	}
606	<	catch(InterruptedException e) {
607	<	threadFail("unexpected exception");
608	<	}
609	<	}
610	<	});
611	<
612	<	try {
613	<	t1.start();
614	<	t2.start();
615	<	Thread.sleep(SHORT_DELAY_MS);
616	<	lock.writeLock().lock();
617	<	c.signalAll();
618	<	lock.writeLock().unlock();
619	<	t1.join(SHORT_DELAY_MS);
620	<	t2.join(SHORT_DELAY_MS);
621	<	assertFalse(t1.isAlive());
622	<	assertFalse(t2.isAlive());
623	<	}
624	<	catch (Exception ex) {
625	<	fail("unexpected exception");
626	<	}
844	>	/**
845	>	* await is interruptible
846	>	*/
847	>	public void testAwait_Interrupt() throws InterruptedException {
848	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
849	>	final Condition c = lock.writeLock().newCondition();
850	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
851	>	public void realRun() throws InterruptedException {
852	>	lock.writeLock().lock();
853	>	c.await();
854	>	lock.writeLock().unlock();
855	>	}});
856	>
857	>	Thread.sleep(SHORT_DELAY_MS);
858	>	t.interrupt();
859	>	t.join(SHORT_DELAY_MS);
860	>	assertFalse(t.isAlive());
861		}
862
863	<	public void testSerialization() {
863	>	/**
864	>	* awaitNanos is interruptible
865	>	*/
866	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
867	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
868	>	final Condition c = lock.writeLock().newCondition();
869	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
870	>	public void realRun() throws InterruptedException {
871	>	lock.writeLock().lock();
872	>	c.awaitNanos(MILLISECONDS.toNanos(LONG_DELAY_MS));
873	>	lock.writeLock().unlock();
874	>	}});
875	>
876	>	Thread.sleep(SHORT_DELAY_MS);
877	>	t.interrupt();
878	>	t.join(SHORT_DELAY_MS);
879	>	assertFalse(t.isAlive());
880	>	}
881	>
882	>	/**
883	>	* awaitUntil is interruptible
884	>	*/
885	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
886	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
887	>	final Condition c = lock.writeLock().newCondition();
888	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
889	>	public void realRun() throws InterruptedException {
890	>	lock.writeLock().lock();
891	>	java.util.Date d = new java.util.Date();
892	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
893	>	lock.writeLock().unlock();
894	>	}});
895	>
896	>	Thread.sleep(SHORT_DELAY_MS);
897	>	t.interrupt();
898	>	t.join(SHORT_DELAY_MS);
899	>	assertFalse(t.isAlive());
900	>	}
901	>
902	>	/**
903	>	* signalAll wakes up all threads
904	>	*/
905	>	public void testSignalAll() throws InterruptedException {
906	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
907	>	final Condition c = lock.writeLock().newCondition();
908	>	Thread t1 = newStartedThread(new CheckedRunnable() {
909	>	public void realRun() throws InterruptedException {
910	>	lock.writeLock().lock();
911	>	c.await();
912	>	lock.writeLock().unlock();
913	>	}});
914	>
915	>	Thread t2 = newStartedThread(new CheckedRunnable() {
916	>	public void realRun() throws InterruptedException {
917	>	lock.writeLock().lock();
918	>	c.await();
919	>	lock.writeLock().unlock();
920	>	}});
921	>
922	>	Thread.sleep(SHORT_DELAY_MS);
923	>	lock.writeLock().lock();
924	>	c.signalAll();
925	>	lock.writeLock().unlock();
926	>	t1.join(SHORT_DELAY_MS);
927	>	t2.join(SHORT_DELAY_MS);
928	>	assertFalse(t1.isAlive());
929	>	assertFalse(t2.isAlive());
930	>	}
931	>
932	>	/**
933	>	* A serialized lock deserializes as unlocked
934	>	*/
935	>	public void testSerialization() throws Exception {
936		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
937		l.readLock().lock();
938		l.readLock().unlock();
939
940	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
941	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
942	+	out.writeObject(l);
943	+	out.close();
944	+
945	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
946	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
947	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
948	+	r.readLock().lock();
949	+	r.readLock().unlock();
950	+	}
951	+
952	+	/**
953	+	* hasQueuedThreads reports whether there are waiting threads
954	+	*/
955	+	public void testhasQueuedThreads() throws InterruptedException {
956	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
957	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
958	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
959	+	assertFalse(lock.hasQueuedThreads());
960	+	lock.writeLock().lock();
961	+	t1.start();
962	+	Thread.sleep(SHORT_DELAY_MS);
963	+	assertTrue(lock.hasQueuedThreads());
964	+	t2.start();
965	+	Thread.sleep(SHORT_DELAY_MS);
966	+	assertTrue(lock.hasQueuedThreads());
967	+	t1.interrupt();
968	+	Thread.sleep(SHORT_DELAY_MS);
969	+	assertTrue(lock.hasQueuedThreads());
970	+	lock.writeLock().unlock();
971	+	Thread.sleep(SHORT_DELAY_MS);
972	+	assertFalse(lock.hasQueuedThreads());
973	+	t1.join();
974	+	t2.join();
975	+	}
976	+
977	+	/**
978	+	* hasQueuedThread(null) throws NPE
979	+	*/
980	+	public void testHasQueuedThreadNPE() {
981	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
982		try {
983	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
984	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
985	<	out.writeObject(l);
638	<	out.close();
639	<
640	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
641	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
642	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
643	<	r.readLock().lock();
644	<	r.readLock().unlock();
645	<	} catch(Exception e){
646	<	e.printStackTrace();
647	<	fail("unexpected exception");
648	<	}
983	>	sync.hasQueuedThread(null);
984	>	shouldThrow();
985	>	} catch (NullPointerException success) {}
986		}
987
988	+	/**
989	+	* hasQueuedThread reports whether a thread is queued.
990	+	*/
991	+	public void testHasQueuedThread() throws InterruptedException {
992	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
993	+	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
994	+	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
995	+	assertFalse(sync.hasQueuedThread(t1));
996	+	assertFalse(sync.hasQueuedThread(t2));
997	+	sync.writeLock().lock();
998	+	t1.start();
999	+	Thread.sleep(SHORT_DELAY_MS);
1000	+	assertTrue(sync.hasQueuedThread(t1));
1001	+	t2.start();
1002	+	Thread.sleep(SHORT_DELAY_MS);
1003	+	assertTrue(sync.hasQueuedThread(t1));
1004	+	assertTrue(sync.hasQueuedThread(t2));
1005	+	t1.interrupt();
1006	+	Thread.sleep(SHORT_DELAY_MS);
1007	+	assertFalse(sync.hasQueuedThread(t1));
1008	+	assertTrue(sync.hasQueuedThread(t2));
1009	+	sync.writeLock().unlock();
1010	+	Thread.sleep(SHORT_DELAY_MS);
1011	+	assertFalse(sync.hasQueuedThread(t1));
1012	+	Thread.sleep(SHORT_DELAY_MS);
1013	+	assertFalse(sync.hasQueuedThread(t2));
1014	+	t1.join();
1015	+	t2.join();
1016	+	}
1017	+
1018	+
1019	+	/**
1020	+	* getQueueLength reports number of waiting threads
1021	+	*/
1022	+	public void testGetQueueLength() throws InterruptedException {
1023	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1024	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1025	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1026	+	assertEquals(0, lock.getQueueLength());
1027	+	lock.writeLock().lock();
1028	+	t1.start();
1029	+	Thread.sleep(SHORT_DELAY_MS);
1030	+	assertEquals(1, lock.getQueueLength());
1031	+	t2.start();
1032	+	Thread.sleep(SHORT_DELAY_MS);
1033	+	assertEquals(2, lock.getQueueLength());
1034	+	t1.interrupt();
1035	+	Thread.sleep(SHORT_DELAY_MS);
1036	+	assertEquals(1, lock.getQueueLength());
1037	+	lock.writeLock().unlock();
1038	+	Thread.sleep(SHORT_DELAY_MS);
1039	+	assertEquals(0, lock.getQueueLength());
1040	+	t1.join();
1041	+	t2.join();
1042	+	}
1043	+
1044	+	/**
1045	+	* getQueuedThreads includes waiting threads
1046	+	*/
1047	+	public void testGetQueuedThreads() throws InterruptedException {
1048	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1049	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1050	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1051	+	assertTrue(lock.getQueuedThreads().isEmpty());
1052	+	lock.writeLock().lock();
1053	+	assertTrue(lock.getQueuedThreads().isEmpty());
1054	+	t1.start();
1055	+	Thread.sleep(SHORT_DELAY_MS);
1056	+	assertTrue(lock.getQueuedThreads().contains(t1));
1057	+	t2.start();
1058	+	Thread.sleep(SHORT_DELAY_MS);
1059	+	assertTrue(lock.getQueuedThreads().contains(t1));
1060	+	assertTrue(lock.getQueuedThreads().contains(t2));
1061	+	t1.interrupt();
1062	+	Thread.sleep(SHORT_DELAY_MS);
1063	+	assertFalse(lock.getQueuedThreads().contains(t1));
1064	+	assertTrue(lock.getQueuedThreads().contains(t2));
1065	+	lock.writeLock().unlock();
1066	+	Thread.sleep(SHORT_DELAY_MS);
1067	+	assertTrue(lock.getQueuedThreads().isEmpty());
1068	+	t1.join();
1069	+	t2.join();
1070	+	}
1071	+
1072	+	/**
1073	+	* hasWaiters throws NPE if null
1074	+	*/
1075	+	public void testHasWaitersNPE() {
1076	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1077	+	try {
1078	+	lock.hasWaiters(null);
1079	+	shouldThrow();
1080	+	} catch (NullPointerException success) {}
1081	+	}
1082	+
1083	+	/**
1084	+	* getWaitQueueLength throws NPE if null
1085	+	*/
1086	+	public void testGetWaitQueueLengthNPE() {
1087	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1088	+	try {
1089	+	lock.getWaitQueueLength(null);
1090	+	shouldThrow();
1091	+	} catch (NullPointerException success) {}
1092	+	}
1093	+
1094	+
1095	+	/**
1096	+	* getWaitingThreads throws NPE if null
1097	+	*/
1098	+	public void testGetWaitingThreadsNPE() {
1099	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1100	+	try {
1101	+	lock.getWaitingThreads(null);
1102	+	shouldThrow();
1103	+	} catch (NullPointerException success) {}
1104	+	}
1105	+
1106	+	/**
1107	+	* hasWaiters throws IAE if not owned
1108	+	*/
1109	+	public void testHasWaitersIAE() {
1110	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1111	+	final Condition c = lock.writeLock().newCondition();
1112	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1113	+	try {
1114	+	lock2.hasWaiters(c);
1115	+	shouldThrow();
1116	+	} catch (IllegalArgumentException success) {}
1117	+	}
1118	+
1119	+	/**
1120	+	* hasWaiters throws IMSE if not locked
1121	+	*/
1122	+	public void testHasWaitersIMSE() {
1123	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1124	+	final Condition c = lock.writeLock().newCondition();
1125	+	try {
1126	+	lock.hasWaiters(c);
1127	+	shouldThrow();
1128	+	} catch (IllegalMonitorStateException success) {}
1129	+	}
1130	+
1131	+
1132	+	/**
1133	+	* getWaitQueueLength throws IAE if not owned
1134	+	*/
1135	+	public void testGetWaitQueueLengthIAE() {
1136	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1137	+	final Condition c = lock.writeLock().newCondition();
1138	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1139	+	try {
1140	+	lock2.getWaitQueueLength(c);
1141	+	shouldThrow();
1142	+	} catch (IllegalArgumentException success) {}
1143	+	}
1144	+
1145	+	/**
1146	+	* getWaitQueueLength throws IMSE if not locked
1147	+	*/
1148	+	public void testGetWaitQueueLengthIMSE() {
1149	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1150	+	final Condition c = lock.writeLock().newCondition();
1151	+	try {
1152	+	lock.getWaitQueueLength(c);
1153	+	shouldThrow();
1154	+	} catch (IllegalMonitorStateException success) {}
1155	+	}
1156	+
1157	+
1158	+	/**
1159	+	* getWaitingThreads throws IAE if not owned
1160	+	*/
1161	+	public void testGetWaitingThreadsIAE() {
1162	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1163	+	final Condition c = lock.writeLock().newCondition();
1164	+	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1165	+	try {
1166	+	lock2.getWaitingThreads(c);
1167	+	shouldThrow();
1168	+	} catch (IllegalArgumentException success) {}
1169	+	}
1170	+
1171	+	/**
1172	+	* getWaitingThreads throws IMSE if not locked
1173	+	*/
1174	+	public void testGetWaitingThreadsIMSE() {
1175	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1176	+	final Condition c = lock.writeLock().newCondition();
1177	+	try {
1178	+	lock.getWaitingThreads(c);
1179	+	shouldThrow();
1180	+	} catch (IllegalMonitorStateException success) {}
1181	+	}
1182	+
1183	+
1184	+	/**
1185	+	* hasWaiters returns true when a thread is waiting, else false
1186	+	*/
1187	+	public void testHasWaiters() throws InterruptedException {
1188	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1189	+	final Condition c = lock.writeLock().newCondition();
1190	+	Thread t = newStartedThread(new CheckedRunnable() {
1191	+	public void realRun() throws InterruptedException {
1192	+	lock.writeLock().lock();
1193	+	assertFalse(lock.hasWaiters(c));
1194	+	assertEquals(0, lock.getWaitQueueLength(c));
1195	+	c.await();
1196	+	lock.writeLock().unlock();
1197	+	}});
1198	+
1199	+	Thread.sleep(SHORT_DELAY_MS);
1200	+	lock.writeLock().lock();
1201	+	assertTrue(lock.hasWaiters(c));
1202	+	assertEquals(1, lock.getWaitQueueLength(c));
1203	+	c.signal();
1204	+	lock.writeLock().unlock();
1205	+	Thread.sleep(SHORT_DELAY_MS);
1206	+	lock.writeLock().lock();
1207	+	assertFalse(lock.hasWaiters(c));
1208	+	assertEquals(0, lock.getWaitQueueLength(c));
1209	+	lock.writeLock().unlock();
1210	+	t.join(SHORT_DELAY_MS);
1211	+	assertFalse(t.isAlive());
1212	+	}
1213	+
1214	+	/**
1215	+	* getWaitQueueLength returns number of waiting threads
1216	+	*/
1217	+	public void testGetWaitQueueLength() throws InterruptedException {
1218	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1219	+	final Condition c = lock.writeLock().newCondition();
1220	+	Thread t = newStartedThread(new CheckedRunnable() {
1221	+	public void realRun() throws InterruptedException {
1222	+	lock.writeLock().lock();
1223	+	assertFalse(lock.hasWaiters(c));
1224	+	assertEquals(0, lock.getWaitQueueLength(c));
1225	+	c.await();
1226	+	lock.writeLock().unlock();
1227	+	}});
1228	+
1229	+	Thread.sleep(SHORT_DELAY_MS);
1230	+	lock.writeLock().lock();
1231	+	assertTrue(lock.hasWaiters(c));
1232	+	assertEquals(1, lock.getWaitQueueLength(c));
1233	+	c.signal();
1234	+	lock.writeLock().unlock();
1235	+	Thread.sleep(SHORT_DELAY_MS);
1236	+	lock.writeLock().lock();
1237	+	assertFalse(lock.hasWaiters(c));
1238	+	assertEquals(0, lock.getWaitQueueLength(c));
1239	+	lock.writeLock().unlock();
1240	+	t.join(SHORT_DELAY_MS);
1241	+	assertFalse(t.isAlive());
1242	+	}
1243	+
1244	+
1245	+	/**
1246	+	* getWaitingThreads returns only and all waiting threads
1247	+	*/
1248	+	public void testGetWaitingThreads() throws InterruptedException {
1249	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1250	+	final Condition c = lock.writeLock().newCondition();
1251	+	Thread t1 = new Thread(new CheckedRunnable() {
1252	+	public void realRun() throws InterruptedException {
1253	+	lock.writeLock().lock();
1254	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1255	+	c.await();
1256	+	lock.writeLock().unlock();
1257	+	}});
1258	+
1259	+	Thread t2 = new Thread(new CheckedRunnable() {
1260	+	public void realRun() throws InterruptedException {
1261	+	lock.writeLock().lock();
1262	+	assertFalse(lock.getWaitingThreads(c).isEmpty());
1263	+	c.await();
1264	+	lock.writeLock().unlock();
1265	+	}});
1266	+
1267	+	lock.writeLock().lock();
1268	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1269	+	lock.writeLock().unlock();
1270	+	t1.start();
1271	+	Thread.sleep(SHORT_DELAY_MS);
1272	+	t2.start();
1273	+	Thread.sleep(SHORT_DELAY_MS);
1274	+	lock.writeLock().lock();
1275	+	assertTrue(lock.hasWaiters(c));
1276	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1277	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1278	+	c.signalAll();
1279	+	lock.writeLock().unlock();
1280	+	Thread.sleep(SHORT_DELAY_MS);
1281	+	lock.writeLock().lock();
1282	+	assertFalse(lock.hasWaiters(c));
1283	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1284	+	lock.writeLock().unlock();
1285	+	t1.join(SHORT_DELAY_MS);
1286	+	t2.join(SHORT_DELAY_MS);
1287	+	assertFalse(t1.isAlive());
1288	+	assertFalse(t2.isAlive());
1289	+	}
1290	+
1291	+	/**
1292	+	* toString indicates current lock state
1293	+	*/
1294	+	public void testToString() {
1295	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1296	+	String us = lock.toString();
1297	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1298	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1299	+	lock.writeLock().lock();
1300	+	String ws = lock.toString();
1301	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1302	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1303	+	lock.writeLock().unlock();
1304	+	lock.readLock().lock();
1305	+	lock.readLock().lock();
1306	+	String rs = lock.toString();
1307	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1308	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1309	+	}
1310	+
1311	+	/**
1312	+	* readLock.toString indicates current lock state
1313	+	*/
1314	+	public void testReadLockToString() {
1315	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1316	+	String us = lock.readLock().toString();
1317	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1318	+	lock.readLock().lock();
1319	+	lock.readLock().lock();
1320	+	String rs = lock.readLock().toString();
1321	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1322	+	}
1323	+
1324	+	/**
1325	+	* writeLock.toString indicates current lock state
1326	+	*/
1327	+	public void testWriteLockToString() {
1328	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1329	+	String us = lock.writeLock().toString();
1330	+	assertTrue(us.indexOf("Unlocked") >= 0);
1331	+	lock.writeLock().lock();
1332	+	String ls = lock.writeLock().toString();
1333	+	assertTrue(ls.indexOf("Locked") >= 0);
1334	+	}
1335
1336		}

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