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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 1.48 by jsr166, Mon May 2 00:06:45 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	>	t.join();
228	>	releaseLock(lock.writeLock());
229	>	}
230
231	+	/**
232	+	* read-lockInterruptibly is interruptible
233	+	*/
234	+	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
235	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
236	+	lock.writeLock().lock();
237	+	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
238	+	public void realRun() throws InterruptedException {
239	+	lock.readLock().lockInterruptibly();
240	+	}});
241	+
242	+	Thread.sleep(SHORT_DELAY_MS);
243	+	t.interrupt();
244	+	t.join();
245	+	releaseLock(lock.writeLock());
246	+	}
247
248	<	public void testLockInterruptibly() {
249	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
250	<	try {
251	<	lock.writeLock().lockInterruptibly();
252	<	} catch(Exception e) {
253	<	fail("unexpected exception");
254	<	}
255	<	Thread t = new Thread(new Runnable() {
256	<	public void run() {
257	<	try {
258	<	lock.writeLock().lockInterruptibly();
259	<	threadFail("should throw");
260	<	}
261	<	catch(InterruptedException success) {
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	<	}
248	>	/**
249	>	* timed read-tryLock is interruptible
250	>	*/
251	>	public void testReadTryLock_Interrupted() throws InterruptedException {
252	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
253	>	lock.writeLock().lock();
254	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
255	>	public void realRun() throws InterruptedException {
256	>	lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS);
257	>	}});
258	>
259	>	Thread.sleep(SHORT_DELAY_MS);
260	>	t.interrupt();
261	>	t.join();
262		}
263
264	<	public void testLockInterruptibly2() {
265	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
266	<	try {
267	<	lock.writeLock().lockInterruptibly();
268	<	} catch(Exception e) {
269	<	fail("unexpected exception");
270	<	}
271	<	Thread t = new Thread(new Runnable() {
272	<	public void run() {
273	<	try {
274	<	lock.readLock().lockInterruptibly();
275	<	threadFail("should throw");
276	<	}
277	<	catch(InterruptedException success) {
278	<	}
279	<	}
280	<	});
281	<	try {
282	<	t.start();
283	<	t.interrupt();
284	<	t.join();
285	<	lock.writeLock().unlock();
286	<	} catch(Exception e){
287	<	fail("unexpected exception");
288	<	}
264	>
265	>	/**
266	>	* write-tryLock fails if locked
267	>	*/
268	>	public void testWriteTryLockWhenLocked() throws InterruptedException {
269	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
270	>	lock.writeLock().lock();
271	>	Thread t = newStartedThread(new CheckedRunnable() {
272	>	public void realRun() {
273	>	assertFalse(lock.writeLock().tryLock());
274	>	}});
275	>
276	>	t.join();
277	>	lock.writeLock().unlock();
278	>	}
279	>
280	>	/**
281	>	* read-tryLock fails if locked
282	>	*/
283	>	public void testReadTryLockWhenLocked() throws InterruptedException {
284	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
285	>	lock.writeLock().lock();
286	>	Thread t = newStartedThread(new CheckedRunnable() {
287	>	public void realRun() {
288	>	assertFalse(lock.readLock().tryLock());
289	>	}});
290	>
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 = newStartedThread(new CheckedRunnable() {
302	>	public void realRun() {
303	>	assertTrue(lock.readLock().tryLock());
304	>	lock.readLock().unlock();
305	>	}});
306	>
307	>	t.join();
308	>	lock.readLock().unlock();
309	>	}
310	>
311	>	/**
312	>	* A writelock succeeds after reading threads unlock
313	>	*/
314	>	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
315	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
316	>	lock.readLock().lock();
317	>	Thread t1 = newStartedThread(new CheckedRunnable() {
318	>	public void realRun() {
319	>	lock.readLock().lock();
320	>	lock.readLock().unlock();
321	>	}});
322	>	Thread t2 = newStartedThread(new CheckedRunnable() {
323	>	public void realRun() {
324	>	lock.writeLock().lock();
325	>	lock.writeLock().unlock();
326	>	}});
327	>
328	>	Thread.sleep(SHORT_DELAY_MS);
329	>	lock.readLock().unlock();
330	>	t1.join(MEDIUM_DELAY_MS);
331	>	t2.join(MEDIUM_DELAY_MS);
332	>	assertTrue(!t1.isAlive());
333	>	assertTrue(!t2.isAlive());
334	>	}
335	>
336	>	/**
337	>	* Readlocks succeed after a writing thread unlocks
338	>	*/
339	>	public void testReadAfterWriteLock() throws InterruptedException {
340	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
341	>	lock.writeLock().lock();
342	>	Thread t1 = newStartedThread(new CheckedRunnable() {
343	>	public void realRun() {
344	>	lock.readLock().lock();
345	>	lock.readLock().unlock();
346	>	}});
347	>	Thread t2 = newStartedThread(new CheckedRunnable() {
348	>	public void realRun() {
349	>	lock.readLock().lock();
350	>	lock.readLock().unlock();
351	>	}});
352	>
353	>	Thread.sleep(SHORT_DELAY_MS);
354	>	lock.writeLock().unlock();
355	>	t1.join(MEDIUM_DELAY_MS);
356	>	t2.join(MEDIUM_DELAY_MS);
357	>	assertTrue(!t1.isAlive());
358	>	assertTrue(!t2.isAlive());
359	>	}
360	>
361	>	/**
362	>	* Read trylock succeeds if write locked by current thread
363	>	*/
364	>	public void testReadHoldingWriteLock() {
365	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
366	>	lock.writeLock().lock();
367	>	assertTrue(lock.readLock().tryLock());
368	>	lock.readLock().unlock();
369	>	lock.writeLock().unlock();
370	>	}
371	>
372	>	/**
373	>	* Read lock succeeds if write locked by current thread even if
374	>	* other threads are waiting for readlock
375	>	*/
376	>	public void testReadHoldingWriteLock2() throws InterruptedException {
377	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
378	>	lock.writeLock().lock();
379	>	Thread t1 = newStartedThread(new CheckedRunnable() {
380	>	public void realRun() {
381	>	lock.readLock().lock();
382	>	lock.readLock().unlock();
383	>	}});
384	>	Thread t2 = newStartedThread(new CheckedRunnable() {
385	>	public void realRun() {
386	>	lock.readLock().lock();
387	>	lock.readLock().unlock();
388	>	}});
389	>
390	>	lock.readLock().lock();
391	>	lock.readLock().unlock();
392	>	Thread.sleep(SHORT_DELAY_MS);
393	>	lock.readLock().lock();
394	>	lock.readLock().unlock();
395	>	lock.writeLock().unlock();
396	>	t1.join(MEDIUM_DELAY_MS);
397	>	t2.join(MEDIUM_DELAY_MS);
398	>	assertTrue(!t1.isAlive());
399	>	assertTrue(!t2.isAlive());
400	>	}
401	>
402	>	/**
403	>	* Read lock succeeds if write locked by current thread even if
404	>	* other threads are waiting for writelock
405	>	*/
406	>	public void testReadHoldingWriteLock3() throws InterruptedException {
407	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
408	>	lock.writeLock().lock();
409	>	Thread t1 = newStartedThread(new CheckedRunnable() {
410	>	public void realRun() {
411	>	lock.writeLock().lock();
412	>	lock.writeLock().unlock();
413	>	}});
414	>	Thread t2 = newStartedThread(new CheckedRunnable() {
415	>	public void realRun() {
416	>	lock.writeLock().lock();
417	>	lock.writeLock().unlock();
418	>	}});
419	>
420	>	lock.readLock().lock();
421	>	lock.readLock().unlock();
422	>	Thread.sleep(SHORT_DELAY_MS);
423	>	lock.readLock().lock();
424	>	lock.readLock().unlock();
425	>	lock.writeLock().unlock();
426	>	t1.join(MEDIUM_DELAY_MS);
427	>	t2.join(MEDIUM_DELAY_MS);
428	>	assertTrue(!t1.isAlive());
429	>	assertTrue(!t2.isAlive());
430	>	}
431	>
432	>
433	>	/**
434	>	* Write lock succeeds if write locked by current thread even if
435	>	* other threads are waiting for writelock
436	>	*/
437	>	public void testWriteHoldingWriteLock4() throws InterruptedException {
438	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
439	>	lock.writeLock().lock();
440	>	Thread t1 = newStartedThread(new CheckedRunnable() {
441	>	public void realRun() {
442	>	lock.writeLock().lock();
443	>	lock.writeLock().unlock();
444	>	}});
445	>	Thread t2 = newStartedThread(new CheckedRunnable() {
446	>	public void realRun() {
447	>	lock.writeLock().lock();
448	>	lock.writeLock().unlock();
449	>	}});
450	>
451	>	lock.writeLock().lock();
452	>	lock.writeLock().unlock();
453	>	Thread.sleep(SHORT_DELAY_MS);
454	>	lock.writeLock().lock();
455	>	lock.writeLock().unlock();
456	>	lock.writeLock().unlock();
457	>	t1.join(MEDIUM_DELAY_MS);
458	>	t2.join(MEDIUM_DELAY_MS);
459	>	assertTrue(!t1.isAlive());
460	>	assertTrue(!t2.isAlive());
461	>	}
462	>
463	>
464	>	/**
465	>	* Fair Read trylock succeeds if write locked by current thread
466	>	*/
467	>	public void testReadHoldingWriteLockFair() {
468	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
469	>	lock.writeLock().lock();
470	>	assertTrue(lock.readLock().tryLock());
471	>	lock.readLock().unlock();
472	>	lock.writeLock().unlock();
473	>	}
474	>
475	>	/**
476	>	* Fair Read lock succeeds if write locked by current thread even if
477	>	* other threads are waiting for readlock
478	>	*/
479	>	public void testReadHoldingWriteLockFair2() throws InterruptedException {
480	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
481	>	lock.writeLock().lock();
482	>	Thread t1 = newStartedThread(new CheckedRunnable() {
483	>	public void realRun() {
484	>	lock.readLock().lock();
485	>	lock.readLock().unlock();
486	>	}});
487	>	Thread t2 = newStartedThread(new CheckedRunnable() {
488	>	public void realRun() {
489	>	lock.readLock().lock();
490	>	lock.readLock().unlock();
491	>	}});
492	>
493	>	lock.readLock().lock();
494	>	lock.readLock().unlock();
495	>	Thread.sleep(SHORT_DELAY_MS);
496	>	lock.readLock().lock();
497	>	lock.readLock().unlock();
498	>	lock.writeLock().unlock();
499	>	t1.join(MEDIUM_DELAY_MS);
500	>	t2.join(MEDIUM_DELAY_MS);
501	>	assertTrue(!t1.isAlive());
502	>	assertTrue(!t2.isAlive());
503	>	}
504	>
505	>
506	>	/**
507	>	* Fair Read lock succeeds if write locked by current thread even if
508	>	* other threads are waiting for writelock
509	>	*/
510	>	public void testReadHoldingWriteLockFair3() throws InterruptedException {
511	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
512	>	lock.writeLock().lock();
513	>	Thread t1 = newStartedThread(new CheckedRunnable() {
514	>	public void realRun() {
515	>	lock.writeLock().lock();
516	>	lock.writeLock().unlock();
517	>	}});
518	>	Thread t2 = newStartedThread(new CheckedRunnable() {
519	>	public void realRun() {
520	>	lock.writeLock().lock();
521	>	lock.writeLock().unlock();
522	>	}});
523	>
524	>	lock.readLock().lock();
525	>	lock.readLock().unlock();
526	>	Thread.sleep(SHORT_DELAY_MS);
527	>	lock.readLock().lock();
528	>	lock.readLock().unlock();
529	>	lock.writeLock().unlock();
530	>	t1.join(MEDIUM_DELAY_MS);
531	>	t2.join(MEDIUM_DELAY_MS);
532	>	assertTrue(!t1.isAlive());
533	>	assertTrue(!t2.isAlive());
534	>	}
535	>
536	>
537	>	/**
538	>	* Fair Write lock succeeds if write locked by current thread even if
539	>	* other threads are waiting for writelock
540	>	*/
541	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
542	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
543	>	lock.writeLock().lock();
544	>	Thread t1 = newStartedThread(new CheckedRunnable() {
545	>	public void realRun() {
546	>	lock.writeLock().lock();
547	>	lock.writeLock().unlock();
548	>	}});
549	>	Thread t2 = newStartedThread(new CheckedRunnable() {
550	>	public void realRun() {
551	>	lock.writeLock().lock();
552	>	lock.writeLock().unlock();
553	>	}});
554	>
555	>	Thread.sleep(SHORT_DELAY_MS);
556	>	assertTrue(lock.isWriteLockedByCurrentThread());
557	>	assertEquals(1, lock.getWriteHoldCount());
558	>	lock.writeLock().lock();
559	>	assertEquals(2, lock.getWriteHoldCount());
560	>	lock.writeLock().unlock();
561	>	lock.writeLock().lock();
562	>	lock.writeLock().unlock();
563	>	lock.writeLock().unlock();
564	>	t1.join(MEDIUM_DELAY_MS);
565	>	t2.join(MEDIUM_DELAY_MS);
566	>	assertTrue(!t1.isAlive());
567	>	assertTrue(!t2.isAlive());
568	>	}
569	>
570	>
571	>	/**
572	>	* Read tryLock succeeds if readlocked but not writelocked
573	>	*/
574	>	public void testTryLockWhenReadLocked() throws InterruptedException {
575	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
576	>	lock.readLock().lock();
577	>	Thread t = newStartedThread(new CheckedRunnable() {
578	>	public void realRun() {
579	>	assertTrue(lock.readLock().tryLock());
580	>	lock.readLock().unlock();
581	>	}});
582	>
583	>	t.join();
584	>	lock.readLock().unlock();
585		}
586
587	<	public void testAwait_IllegalMonitor() {
588	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
587	>	/**
588	>	* write tryLock fails when readlocked
589	>	*/
590	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
591	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
592	>	lock.readLock().lock();
593	>	Thread t = newStartedThread(new CheckedRunnable() {
594	>	public void realRun() {
595	>	assertFalse(lock.writeLock().tryLock());
596	>	}});
597	>
598	>	t.join();
599	>	lock.readLock().unlock();
600	>	}
601	>
602	>
603	>	/**
604	>	* Fair Read tryLock succeeds if readlocked but not writelocked
605	>	*/
606	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
607	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
608	>	lock.readLock().lock();
609	>	Thread t = newStartedThread(new CheckedRunnable() {
610	>	public void realRun() {
611	>	assertTrue(lock.readLock().tryLock());
612	>	lock.readLock().unlock();
613	>	}});
614	>
615	>	t.join();
616	>	lock.readLock().unlock();
617	>	}
618	>
619	>
620	>
621	>	/**
622	>	* Fair write tryLock fails when readlocked
623	>	*/
624	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
625	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
626	>	lock.readLock().lock();
627	>	Thread t = newStartedThread(new CheckedRunnable() {
628	>	public void realRun() {
629	>	assertFalse(lock.writeLock().tryLock());
630	>	}});
631	>
632	>	t.join();
633	>	lock.readLock().unlock();
634	>	}
635	>
636	>
637	>
638	>	/**
639	>	* write timed tryLock times out if locked
640	>	*/
641	>	public void testWriteTryLock_Timeout() throws InterruptedException {
642	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
643	>	lock.writeLock().lock();
644	>	Thread t = newStartedThread(new CheckedRunnable() {
645	>	public void realRun() throws InterruptedException {
646	>	assertFalse(lock.writeLock().tryLock(1, MILLISECONDS));
647	>	}});
648	>
649	>	t.join();
650	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
651	>	lock.writeLock().unlock();
652	>	}
653	>
654	>	/**
655	>	* read timed tryLock times out if write-locked
656	>	*/
657	>	public void testReadTryLock_Timeout() throws InterruptedException {
658	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
659	>	lock.writeLock().lock();
660	>	Thread t = newStartedThread(new CheckedRunnable() {
661	>	public void realRun() throws InterruptedException {
662	>	assertFalse(lock.readLock().tryLock(1, MILLISECONDS));
663	>	}});
664	>
665	>	t.join();
666	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
667	>	lock.writeLock().unlock();
668	>	}
669	>
670	>
671	>	/**
672	>	* write lockInterruptibly succeeds if lock free else is interruptible
673	>	*/
674	>	public void testWriteLockInterruptibly() throws InterruptedException {
675	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
676	>	lock.writeLock().lockInterruptibly();
677	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
678	>	public void realRun() throws InterruptedException {
679	>	lock.writeLock().lockInterruptibly();
680	>	}});
681	>
682	>	Thread.sleep(SHORT_DELAY_MS);
683	>	t.interrupt();
684	>	Thread.sleep(SHORT_DELAY_MS);
685	>	t.join();
686	>	lock.writeLock().unlock();
687	>	}
688	>
689	>	/**
690	>	* read lockInterruptibly succeeds if lock free else is interruptible
691	>	*/
692	>	public void testReadLockInterruptibly() throws InterruptedException {
693	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
694	>	lock.writeLock().lockInterruptibly();
695	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
696	>	public void realRun() throws InterruptedException {
697	>	lock.readLock().lockInterruptibly();
698	>	}});
699	>
700	>	Thread.sleep(SHORT_DELAY_MS);
701	>	t.interrupt();
702	>	t.join();
703	>	lock.writeLock().unlock();
704	>	}
705	>
706	>	/**
707	>	* Calling await without holding lock throws IllegalMonitorStateException
708	>	*/
709	>	public void testAwait_IllegalMonitor() throws InterruptedException {
710	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
711		final Condition c = lock.writeLock().newCondition();
712		try {
713		c.await();
714	<	fail("should throw");
715	<	}
380	<	catch (IllegalMonitorStateException success) {
381	<	}
382	<	catch (Exception ex) {
383	<	fail("should throw IMSE");
384	<	}
714	>	shouldThrow();
715	>	} catch (IllegalMonitorStateException success) {}
716		}
717
718	+	/**
719	+	* Calling signal without holding lock throws IllegalMonitorStateException
720	+	*/
721		public void testSignal_IllegalMonitor() {
722	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
722	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
723		final Condition c = lock.writeLock().newCondition();
724		try {
725		c.signal();
726	<	fail("should throw");
727	<	}
394	<	catch (IllegalMonitorStateException success) {
395	<	}
396	<	catch (Exception ex) {
397	<	fail("should throw IMSE");
398	<	}
726	>	shouldThrow();
727	>	} catch (IllegalMonitorStateException success) {}
728		}
729
730	<	public void testAwaitNanos_Timeout() {
731	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
730	>	/**
731	>	* awaitNanos without a signal times out
732	>	*/
733	>	public void testAwaitNanos_Timeout() throws InterruptedException {
734	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
735		final Condition c = lock.writeLock().newCondition();
736	<	try {
737	<	lock.writeLock().lock();
738	<	long t = c.awaitNanos(100);
739	<	assertTrue(t <= 0);
740	<	lock.writeLock().unlock();
409	<	}
410	<	catch (Exception ex) {
411	<	fail("unexpected exception");
412	<	}
736	>
737	>	lock.writeLock().lock();
738	>	long t = c.awaitNanos(100);
739	>	assertTrue(t <= 0);
740	>	lock.writeLock().unlock();
741		}
742
743	<	public void testAwait_Timeout() {
744	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
743	>
744	>	/**
745	>	* timed await without a signal times out
746	>	*/
747	>	public void testAwait_Timeout() throws InterruptedException {
748	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
749		final Condition c = lock.writeLock().newCondition();
750	<	try {
751	<	lock.writeLock().lock();
752	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
421	<	lock.writeLock().unlock();
422	<	}
423	<	catch (Exception ex) {
424	<	fail("unexpected exception");
425	<	}
750	>	lock.writeLock().lock();
751	>	assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
752	>	lock.writeLock().unlock();
753		}
754
755	<	public void testAwaitUntil_Timeout() {
756	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
755	>	/**
756	>	* awaitUntil without a signal times out
757	>	*/
758	>	public void testAwaitUntil_Timeout() throws InterruptedException {
759	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
760		final Condition c = lock.writeLock().newCondition();
761	<	try {
762	<	lock.writeLock().lock();
763	<	java.util.Date d = new java.util.Date();
764	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
435	<	lock.writeLock().unlock();
436	<	}
437	<	catch (Exception ex) {
438	<	fail("unexpected exception");
439	<	}
761	>	lock.writeLock().lock();
762	>	java.util.Date d = new java.util.Date();
763	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
764	>	lock.writeLock().unlock();
765		}
766
767	<	public void testAwait() {
768	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
767	>	/**
768	>	* await returns when signalled
769	>	*/
770	>	public void testAwait() throws InterruptedException {
771	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
772		final Condition c = lock.writeLock().newCondition();
773	<	Thread t = new Thread(new Runnable() {
774	<	public void run() {
775	<	try {
776	<	lock.writeLock().lock();
777	<	c.await();
778	<	lock.writeLock().unlock();
779	<	}
780	<	catch(InterruptedException e) {
781	<	threadFail("unexpected exception");
782	<	}
783	<	}
784	<	});
773	>	Thread t = newStartedThread(new CheckedRunnable() {
774	>	public void realRun() throws InterruptedException {
775	>	lock.writeLock().lock();
776	>	c.await();
777	>	lock.writeLock().unlock();
778	>	}});
779	>
780	>	Thread.sleep(SHORT_DELAY_MS);
781	>	lock.writeLock().lock();
782	>	c.signal();
783	>	lock.writeLock().unlock();
784	>	t.join(SHORT_DELAY_MS);
785	>	assertFalse(t.isAlive());
786	>	}
787
788	<	try {
789	<	t.start();
790	<	Thread.sleep(SHORT_DELAY_MS);
791	<	lock.writeLock().lock();
792	<	c.signal();
793	<	lock.writeLock().unlock();
794	<	t.join(SHORT_DELAY_MS);
795	<	assertFalse(t.isAlive());
796	<	}
797	<	catch (Exception ex) {
798	<	fail("unexpected exception");
788	>	/** A helper class for uninterruptible wait tests */
789	>	class UninterruptableThread extends Thread {
790	>	private Lock lock;
791	>	private Condition c;
792	>
793	>	public volatile boolean canAwake = false;
794	>	public volatile boolean interrupted = false;
795	>	public volatile boolean lockStarted = false;
796	>
797	>	public UninterruptableThread(Lock lock, Condition c) {
798	>	this.lock = lock;
799	>	this.c = c;
800	>	}
801	>
802	>	public synchronized void run() {
803	>	lock.lock();
804	>	lockStarted = true;
805	>
806	>	while (!canAwake) {
807	>	c.awaitUninterruptibly();
808	>	}
809	>
810	>	interrupted = isInterrupted();
811	>	lock.unlock();
812		}
813		}
814
815	<	public void testAwaitUninterruptibly() {
816	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
815	>	/**
816	>	* awaitUninterruptibly doesn't abort on interrupt
817	>	*/
818	>	public void testAwaitUninterruptibly() throws InterruptedException {
819	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
820		final Condition c = lock.writeLock().newCondition();
821	<	Thread t = new Thread(new Runnable() {
822	<	public void run() {
823	<	lock.writeLock().lock();
478	<	c.awaitUninterruptibly();
479	<	lock.writeLock().unlock();
480	<	}
481	<	});
821	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
822	>
823	>	thread.start();
824
825	+	while (!thread.lockStarted) {
826	+	Thread.sleep(100);
827	+	}
828	+
829	+	lock.writeLock().lock();
830		try {
831	<	t.start();
832	<	Thread.sleep(SHORT_DELAY_MS);
486	<	t.interrupt();
487	<	lock.writeLock().lock();
831	>	thread.interrupt();
832	>	thread.canAwake = true;
833		c.signal();
834	+	} finally {
835		lock.writeLock().unlock();
490	–	t.join(SHORT_DELAY_MS);
491	–	assertFalse(t.isAlive());
492	–	}
493	–	catch (Exception ex) {
494	–	fail("unexpected exception");
836		}
837	+
838	+	thread.join();
839	+	assertTrue(thread.interrupted);
840	+	assertFalse(thread.isAlive());
841		}
842
843	<	public void testAwait_Interrupt() {
844	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
845	<	final Condition c = lock.writeLock().newCondition();
846	<	Thread t = new Thread(new Runnable() {
847	<	public void run() {
848	<	try {
849	<	lock.writeLock().lock();
850	<	c.await();
851	<	lock.writeLock().unlock();
852	<	threadFail("should throw");
853	<	}
854	<	catch(InterruptedException success) {
855	<	}
856	<	}
857	<	});
858	<
859	<	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	<	}
843	>	/**
844	>	* await is interruptible
845	>	*/
846	>	public void testAwait_Interrupt() throws InterruptedException {
847	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
848	>	final Condition c = lock.writeLock().newCondition();
849	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
850	>	public void realRun() throws InterruptedException {
851	>	lock.writeLock().lock();
852	>	c.await();
853	>	lock.writeLock().unlock();
854	>	}});
855	>
856	>	Thread.sleep(SHORT_DELAY_MS);
857	>	t.interrupt();
858	>	t.join(SHORT_DELAY_MS);
859	>	assertFalse(t.isAlive());
860		}
861
862	<	public void testSerialization() {
862	>	/**
863	>	* awaitNanos is interruptible
864	>	*/
865	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
866	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
867	>	final Condition c = lock.writeLock().newCondition();
868	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
869	>	public void realRun() throws InterruptedException {
870	>	lock.writeLock().lock();
871	>	c.awaitNanos(MILLISECONDS.toNanos(LONG_DELAY_MS));
872	>	lock.writeLock().unlock();
873	>	}});
874	>
875	>	Thread.sleep(SHORT_DELAY_MS);
876	>	t.interrupt();
877	>	t.join(SHORT_DELAY_MS);
878	>	assertFalse(t.isAlive());
879	>	}
880	>
881	>	/**
882	>	* awaitUntil is interruptible
883	>	*/
884	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
885	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
886	>	final Condition c = lock.writeLock().newCondition();
887	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
888	>	public void realRun() throws InterruptedException {
889	>	lock.writeLock().lock();
890	>	java.util.Date d = new java.util.Date();
891	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
892	>	lock.writeLock().unlock();
893	>	}});
894	>
895	>	Thread.sleep(SHORT_DELAY_MS);
896	>	t.interrupt();
897	>	t.join(SHORT_DELAY_MS);
898	>	assertFalse(t.isAlive());
899	>	}
900	>
901	>	/**
902	>	* signalAll wakes up all threads
903	>	*/
904	>	public void testSignalAll() throws InterruptedException {
905	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
906	>	final Condition c = lock.writeLock().newCondition();
907	>	Thread t1 = newStartedThread(new CheckedRunnable() {
908	>	public void realRun() throws InterruptedException {
909	>	lock.writeLock().lock();
910	>	c.await();
911	>	lock.writeLock().unlock();
912	>	}});
913	>
914	>	Thread t2 = newStartedThread(new CheckedRunnable() {
915	>	public void realRun() throws InterruptedException {
916	>	lock.writeLock().lock();
917	>	c.await();
918	>	lock.writeLock().unlock();
919	>	}});
920	>
921	>	Thread.sleep(SHORT_DELAY_MS);
922	>	lock.writeLock().lock();
923	>	c.signalAll();
924	>	lock.writeLock().unlock();
925	>	t1.join(SHORT_DELAY_MS);
926	>	t2.join(SHORT_DELAY_MS);
927	>	assertFalse(t1.isAlive());
928	>	assertFalse(t2.isAlive());
929	>	}
930	>
931	>	/**
932	>	* A serialized lock deserializes as unlocked
933	>	*/
934	>	public void testSerialization() throws Exception {
935		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
936		l.readLock().lock();
937		l.readLock().unlock();
938
939	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
940	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
941	+	out.writeObject(l);
942	+	out.close();
943	+
944	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
945	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
946	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
947	+	r.readLock().lock();
948	+	r.readLock().unlock();
949	+	}
950	+
951	+	/**
952	+	* hasQueuedThreads reports whether there are waiting threads
953	+	*/
954	+	public void testhasQueuedThreads() throws InterruptedException {
955	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
956	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
957	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
958	+	assertFalse(lock.hasQueuedThreads());
959	+	lock.writeLock().lock();
960	+	t1.start();
961	+	Thread.sleep(SHORT_DELAY_MS);
962	+	assertTrue(lock.hasQueuedThreads());
963	+	t2.start();
964	+	Thread.sleep(SHORT_DELAY_MS);
965	+	assertTrue(lock.hasQueuedThreads());
966	+	t1.interrupt();
967	+	Thread.sleep(SHORT_DELAY_MS);
968	+	assertTrue(lock.hasQueuedThreads());
969	+	lock.writeLock().unlock();
970	+	Thread.sleep(SHORT_DELAY_MS);
971	+	assertFalse(lock.hasQueuedThreads());
972	+	t1.join();
973	+	t2.join();
974	+	}
975	+
976	+	/**
977	+	* hasQueuedThread(null) throws NPE
978	+	*/
979	+	public void testHasQueuedThreadNPE() {
980	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
981		try {
982	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
983	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
984	<	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	<	}
982	>	sync.hasQueuedThread(null);
983	>	shouldThrow();
984	>	} catch (NullPointerException success) {}
985		}
986
987	+	/**
988	+	* hasQueuedThread reports whether a thread is queued.
989	+	*/
990	+	public void testHasQueuedThread() throws InterruptedException {
991	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
992	+	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
993	+	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
994	+	assertFalse(sync.hasQueuedThread(t1));
995	+	assertFalse(sync.hasQueuedThread(t2));
996	+	sync.writeLock().lock();
997	+	t1.start();
998	+	Thread.sleep(SHORT_DELAY_MS);
999	+	assertTrue(sync.hasQueuedThread(t1));
1000	+	t2.start();
1001	+	Thread.sleep(SHORT_DELAY_MS);
1002	+	assertTrue(sync.hasQueuedThread(t1));
1003	+	assertTrue(sync.hasQueuedThread(t2));
1004	+	t1.interrupt();
1005	+	Thread.sleep(SHORT_DELAY_MS);
1006	+	assertFalse(sync.hasQueuedThread(t1));
1007	+	assertTrue(sync.hasQueuedThread(t2));
1008	+	sync.writeLock().unlock();
1009	+	Thread.sleep(SHORT_DELAY_MS);
1010	+	assertFalse(sync.hasQueuedThread(t1));
1011	+	Thread.sleep(SHORT_DELAY_MS);
1012	+	assertFalse(sync.hasQueuedThread(t2));
1013	+	t1.join();
1014	+	t2.join();
1015	+	}
1016	+
1017	+
1018	+	/**
1019	+	* getQueueLength reports number of waiting threads
1020	+	*/
1021	+	public void testGetQueueLength() throws InterruptedException {
1022	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1023	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1024	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1025	+	assertEquals(0, lock.getQueueLength());
1026	+	lock.writeLock().lock();
1027	+	t1.start();
1028	+	Thread.sleep(SHORT_DELAY_MS);
1029	+	assertEquals(1, lock.getQueueLength());
1030	+	t2.start();
1031	+	Thread.sleep(SHORT_DELAY_MS);
1032	+	assertEquals(2, lock.getQueueLength());
1033	+	t1.interrupt();
1034	+	Thread.sleep(SHORT_DELAY_MS);
1035	+	assertEquals(1, lock.getQueueLength());
1036	+	lock.writeLock().unlock();
1037	+	Thread.sleep(SHORT_DELAY_MS);
1038	+	assertEquals(0, lock.getQueueLength());
1039	+	t1.join();
1040	+	t2.join();
1041	+	}
1042	+
1043	+	/**
1044	+	* getQueuedThreads includes waiting threads
1045	+	*/
1046	+	public void testGetQueuedThreads() throws InterruptedException {
1047	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1048	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1049	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1050	+	assertTrue(lock.getQueuedThreads().isEmpty());
1051	+	lock.writeLock().lock();
1052	+	assertTrue(lock.getQueuedThreads().isEmpty());
1053	+	t1.start();
1054	+	Thread.sleep(SHORT_DELAY_MS);
1055	+	assertTrue(lock.getQueuedThreads().contains(t1));
1056	+	t2.start();
1057	+	Thread.sleep(SHORT_DELAY_MS);
1058	+	assertTrue(lock.getQueuedThreads().contains(t1));
1059	+	assertTrue(lock.getQueuedThreads().contains(t2));
1060	+	t1.interrupt();
1061	+	Thread.sleep(SHORT_DELAY_MS);
1062	+	assertFalse(lock.getQueuedThreads().contains(t1));
1063	+	assertTrue(lock.getQueuedThreads().contains(t2));
1064	+	lock.writeLock().unlock();
1065	+	Thread.sleep(SHORT_DELAY_MS);
1066	+	assertTrue(lock.getQueuedThreads().isEmpty());
1067	+	t1.join();
1068	+	t2.join();
1069	+	}
1070	+
1071	+	/**
1072	+	* hasWaiters throws NPE if null
1073	+	*/
1074	+	public void testHasWaitersNPE() {
1075	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1076	+	try {
1077	+	lock.hasWaiters(null);
1078	+	shouldThrow();
1079	+	} catch (NullPointerException success) {}
1080	+	}
1081	+
1082	+	/**
1083	+	* getWaitQueueLength throws NPE if null
1084	+	*/
1085	+	public void testGetWaitQueueLengthNPE() {
1086	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1087	+	try {
1088	+	lock.getWaitQueueLength(null);
1089	+	shouldThrow();
1090	+	} catch (NullPointerException success) {}
1091	+	}
1092	+
1093	+
1094	+	/**
1095	+	* getWaitingThreads throws NPE if null
1096	+	*/
1097	+	public void testGetWaitingThreadsNPE() {
1098	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1099	+	try {
1100	+	lock.getWaitingThreads(null);
1101	+	shouldThrow();
1102	+	} catch (NullPointerException success) {}
1103	+	}
1104	+
1105	+	/**
1106	+	* hasWaiters throws IAE if not owned
1107	+	*/
1108	+	public void testHasWaitersIAE() {
1109	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1110	+	final Condition c = lock.writeLock().newCondition();
1111	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1112	+	try {
1113	+	lock2.hasWaiters(c);
1114	+	shouldThrow();
1115	+	} catch (IllegalArgumentException success) {}
1116	+	}
1117	+
1118	+	/**
1119	+	* hasWaiters throws IMSE if not locked
1120	+	*/
1121	+	public void testHasWaitersIMSE() {
1122	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1123	+	final Condition c = lock.writeLock().newCondition();
1124	+	try {
1125	+	lock.hasWaiters(c);
1126	+	shouldThrow();
1127	+	} catch (IllegalMonitorStateException success) {}
1128	+	}
1129	+
1130	+
1131	+	/**
1132	+	* getWaitQueueLength throws IAE if not owned
1133	+	*/
1134	+	public void testGetWaitQueueLengthIAE() {
1135	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1136	+	final Condition c = lock.writeLock().newCondition();
1137	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1138	+	try {
1139	+	lock2.getWaitQueueLength(c);
1140	+	shouldThrow();
1141	+	} catch (IllegalArgumentException success) {}
1142	+	}
1143	+
1144	+	/**
1145	+	* getWaitQueueLength throws IMSE if not locked
1146	+	*/
1147	+	public void testGetWaitQueueLengthIMSE() {
1148	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1149	+	final Condition c = lock.writeLock().newCondition();
1150	+	try {
1151	+	lock.getWaitQueueLength(c);
1152	+	shouldThrow();
1153	+	} catch (IllegalMonitorStateException success) {}
1154	+	}
1155	+
1156	+
1157	+	/**
1158	+	* getWaitingThreads throws IAE if not owned
1159	+	*/
1160	+	public void testGetWaitingThreadsIAE() {
1161	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1162	+	final Condition c = lock.writeLock().newCondition();
1163	+	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1164	+	try {
1165	+	lock2.getWaitingThreads(c);
1166	+	shouldThrow();
1167	+	} catch (IllegalArgumentException success) {}
1168	+	}
1169	+
1170	+	/**
1171	+	* getWaitingThreads throws IMSE if not locked
1172	+	*/
1173	+	public void testGetWaitingThreadsIMSE() {
1174	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1175	+	final Condition c = lock.writeLock().newCondition();
1176	+	try {
1177	+	lock.getWaitingThreads(c);
1178	+	shouldThrow();
1179	+	} catch (IllegalMonitorStateException success) {}
1180	+	}
1181	+
1182	+
1183	+	/**
1184	+	* hasWaiters returns true when a thread is waiting, else false
1185	+	*/
1186	+	public void testHasWaiters() throws InterruptedException {
1187	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1188	+	final Condition c = lock.writeLock().newCondition();
1189	+	Thread t = newStartedThread(new CheckedRunnable() {
1190	+	public void realRun() throws InterruptedException {
1191	+	lock.writeLock().lock();
1192	+	assertFalse(lock.hasWaiters(c));
1193	+	assertEquals(0, lock.getWaitQueueLength(c));
1194	+	c.await();
1195	+	lock.writeLock().unlock();
1196	+	}});
1197	+
1198	+	Thread.sleep(SHORT_DELAY_MS);
1199	+	lock.writeLock().lock();
1200	+	assertTrue(lock.hasWaiters(c));
1201	+	assertEquals(1, lock.getWaitQueueLength(c));
1202	+	c.signal();
1203	+	lock.writeLock().unlock();
1204	+	Thread.sleep(SHORT_DELAY_MS);
1205	+	lock.writeLock().lock();
1206	+	assertFalse(lock.hasWaiters(c));
1207	+	assertEquals(0, lock.getWaitQueueLength(c));
1208	+	lock.writeLock().unlock();
1209	+	t.join(SHORT_DELAY_MS);
1210	+	assertFalse(t.isAlive());
1211	+	}
1212	+
1213	+	/**
1214	+	* getWaitQueueLength returns number of waiting threads
1215	+	*/
1216	+	public void testGetWaitQueueLength() throws InterruptedException {
1217	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1218	+	final Condition c = lock.writeLock().newCondition();
1219	+	Thread t = newStartedThread(new CheckedRunnable() {
1220	+	public void realRun() throws InterruptedException {
1221	+	lock.writeLock().lock();
1222	+	assertFalse(lock.hasWaiters(c));
1223	+	assertEquals(0, lock.getWaitQueueLength(c));
1224	+	c.await();
1225	+	lock.writeLock().unlock();
1226	+	}});
1227	+
1228	+	Thread.sleep(SHORT_DELAY_MS);
1229	+	lock.writeLock().lock();
1230	+	assertTrue(lock.hasWaiters(c));
1231	+	assertEquals(1, lock.getWaitQueueLength(c));
1232	+	c.signal();
1233	+	lock.writeLock().unlock();
1234	+	Thread.sleep(SHORT_DELAY_MS);
1235	+	lock.writeLock().lock();
1236	+	assertFalse(lock.hasWaiters(c));
1237	+	assertEquals(0, lock.getWaitQueueLength(c));
1238	+	lock.writeLock().unlock();
1239	+	t.join(SHORT_DELAY_MS);
1240	+	assertFalse(t.isAlive());
1241	+	}
1242	+
1243	+
1244	+	/**
1245	+	* getWaitingThreads returns only and all waiting threads
1246	+	*/
1247	+	public void testGetWaitingThreads() throws InterruptedException {
1248	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1249	+	final Condition c = lock.writeLock().newCondition();
1250	+	Thread t1 = new Thread(new CheckedRunnable() {
1251	+	public void realRun() throws InterruptedException {
1252	+	lock.writeLock().lock();
1253	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1254	+	c.await();
1255	+	lock.writeLock().unlock();
1256	+	}});
1257	+
1258	+	Thread t2 = new Thread(new CheckedRunnable() {
1259	+	public void realRun() throws InterruptedException {
1260	+	lock.writeLock().lock();
1261	+	assertFalse(lock.getWaitingThreads(c).isEmpty());
1262	+	c.await();
1263	+	lock.writeLock().unlock();
1264	+	}});
1265	+
1266	+	lock.writeLock().lock();
1267	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1268	+	lock.writeLock().unlock();
1269	+	t1.start();
1270	+	Thread.sleep(SHORT_DELAY_MS);
1271	+	t2.start();
1272	+	Thread.sleep(SHORT_DELAY_MS);
1273	+	lock.writeLock().lock();
1274	+	assertTrue(lock.hasWaiters(c));
1275	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1276	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1277	+	c.signalAll();
1278	+	lock.writeLock().unlock();
1279	+	Thread.sleep(SHORT_DELAY_MS);
1280	+	lock.writeLock().lock();
1281	+	assertFalse(lock.hasWaiters(c));
1282	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1283	+	lock.writeLock().unlock();
1284	+	t1.join(SHORT_DELAY_MS);
1285	+	t2.join(SHORT_DELAY_MS);
1286	+	assertFalse(t1.isAlive());
1287	+	assertFalse(t2.isAlive());
1288	+	}
1289	+
1290	+	/**
1291	+	* toString indicates current lock state
1292	+	*/
1293	+	public void testToString() {
1294	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1295	+	String us = lock.toString();
1296	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1297	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1298	+	lock.writeLock().lock();
1299	+	String ws = lock.toString();
1300	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1301	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1302	+	lock.writeLock().unlock();
1303	+	lock.readLock().lock();
1304	+	lock.readLock().lock();
1305	+	String rs = lock.toString();
1306	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1307	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1308	+	}
1309	+
1310	+	/**
1311	+	* readLock.toString indicates current lock state
1312	+	*/
1313	+	public void testReadLockToString() {
1314	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1315	+	String us = lock.readLock().toString();
1316	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1317	+	lock.readLock().lock();
1318	+	lock.readLock().lock();
1319	+	String rs = lock.readLock().toString();
1320	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1321	+	}
1322	+
1323	+	/**
1324	+	* writeLock.toString indicates current lock state
1325	+	*/
1326	+	public void testWriteLockToString() {
1327	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1328	+	String us = lock.writeLock().toString();
1329	+	assertTrue(us.indexOf("Unlocked") >= 0);
1330	+	lock.writeLock().lock();
1331	+	String ls = lock.writeLock().toString();
1332	+	assertTrue(ls.indexOf("Locked") >= 0);
1333	+	}
1334
1335		}

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