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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.2 by dl, Sun Sep 7 20:39:11 2003 UTC vs.
Revision 1.57 by dl, Sat May 7 11:15:04 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.atomic.AtomicBoolean;
11		import java.util.concurrent.locks.*;
12		import java.util.concurrent.*;
13	+	import static java.util.concurrent.TimeUnit.MILLISECONDS;
14		import java.io.*;
15	+	import java.util.*;
16
17	<	public class ReentrantReadWriteLockTest extends TestCase {
14	<	static int HOLD_COUNT_TEST_LIMIT = 20;
15	<
17	>	public class ReentrantReadWriteLockTest extends JSR166TestCase {
18		public static void main(String[] args) {
19	<	junit.textui.TestRunner.run (suite());
19	>	junit.textui.TestRunner.run(suite());
20		}
19	–
21		public static Test suite() {
22	<	return new TestSuite(ReentrantReadWriteLockTest.class);
22	>	return new TestSuite(ReentrantReadWriteLockTest.class);
23		}
24
25	+	/**
26	+	* A runnable calling lockInterruptibly
27	+	*/
28	+	class InterruptibleLockRunnable extends CheckedRunnable {
29	+	final ReentrantReadWriteLock lock;
30	+	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
31	+	public void realRun() throws InterruptedException {
32	+	lock.writeLock().lockInterruptibly();
33	+	}
34	+	}
35
36	<	private static long SHORT_DELAY_MS = 100;
37	<	private static long MEDIUM_DELAY_MS = 1000;
38	<	private static long LONG_DELAY_MS = 10000;
36	>	/**
37	>	* A runnable calling lockInterruptibly that expects to be
38	>	* interrupted
39	>	*/
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	<	/*
49	<	* Unlocks an unlocked lock, throws Illegal Monitor State
31	<	*
48	>	/**
49	>	* Subclass to expose protected methods
50		*/
51	<
52	<	public void testIllegalMonitorStateException(){
53	<	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
54	<	try{
55	<	rl.writeLock().unlock();
56	<	fail("Should of thown Illegal Monitor State Exception");
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	<	}catch(IllegalMonitorStateException success){}
61	>	/**
62	>	* Releases write lock, checking that it had a hold count of 1.
63	>	*/
64	>	void releaseWriteLock(ReentrantReadWriteLock lock) {
65	>	ReentrantReadWriteLock.WriteLock writeLock = lock.writeLock();
66	>	assertTrue(writeLock.isHeldByCurrentThread());
67	>	writeLock.unlock();
68	>	assertFalse(writeLock.isHeldByCurrentThread());
69		}
70
71	+	/**
72	+	* Spin-waits until lock.hasQueuedThread(t) becomes true.
73	+	*/
74	+	void waitForQueuedThread(ReentrantReadWriteLock lock, Thread t) {
75	+	long startTime = System.nanoTime();
76	+	while (!lock.hasQueuedThread(t)) {
77	+	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
78	+	throw new AssertionError("timed out");
79	+	Thread.yield();
80	+	}
81	+	}
82
83	+	/**
84	+	* Checks that lock is not write-locked.
85	+	*/
86	+	void assertNotWriteLocked(ReentrantReadWriteLock lock) {
87	+	assertFalse(lock.isWriteLocked());
88	+	assertFalse(lock.isWriteLockedByCurrentThread());
89	+	assertEquals(0, lock.getWriteHoldCount());
90	+	}
91
92	<	public void testInterruptedException(){
93	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
94	<	lock.writeLock().lock();
95	<	Thread t = new Thread(new Runnable() {
96	<	public void run(){
50	<	try{
51	<	lock.writeLock().lockInterruptibly();
52	<	fail("should throw");
53	<	}catch(InterruptedException success){}
54	<	}
55	<	});
56	<	try {
57	<	t.start();
58	<	t.interrupt();
59	<	lock.writeLock().unlock();
60	<	t.join();
61	<	} catch(Exception e){
62	<	fail("unexpected exception");
63	<	}
64	<	}
65	<
66	<	public void testInterruptedException2(){
67	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
68	<	lock.writeLock().lock();
69	<	Thread t = new Thread(new Runnable() {
70	<	public void run(){
71	<	try{
72	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
73	<	fail("should throw");
74	<	}catch(InterruptedException success){}
75	<	}
76	<	});
77	<	try {
78	<	t.start();
79	<	t.interrupt();
80	<	lock.writeLock().unlock();
81	<	t.join();
82	<	} catch(Exception e){
83	<	fail("unexpected exception");
84	<	}
92	>	/**
93	>	* Checks that condition c has no waiters.
94	>	*/
95	>	void assertHasNoWaiters(PublicReentrantReadWriteLock lock, Condition c) {
96	>	assertHasWaiters(lock, c, new Thread[] {});
97		}
98
99	<	public void testInterruptedException3(){
100	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
101	<	lock.writeLock().lock();
102	<	Thread t = new Thread(new Runnable() {
103	<	public void run(){
104	<	try{
105	<	lock.readLock().lockInterruptibly();
106	<	fail("should throw");
107	<	}catch(InterruptedException success){}
108	<	}
109	<	});
110	<	try {
111	<	t.start();
100	<	t.interrupt();
101	<	lock.writeLock().unlock();
102	<	t.join();
103	<	} catch(Exception e){
104	<	fail("unexpected exception");
105	<	}
106	<	}
107	<
108	<	public void testInterruptedException4(){
109	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
110	<	lock.writeLock().lock();
111	<	Thread t = new Thread(new Runnable() {
112	<	public void run(){
113	<	try{
114	<	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
115	<	fail("should throw");
116	<	}catch(InterruptedException success){}
117	<	}
118	<	});
119	<	try {
120	<	t.start();
121	<	t.interrupt();
122	<	t.join();
123	<	} catch(Exception e){
124	<	fail("unexpected exception");
125	<	}
99	>	/**
100	>	* Checks that condition c has exactly the given waiter threads.
101	>	*/
102	>	void assertHasWaiters(PublicReentrantReadWriteLock lock, Condition c,
103	>	Thread... threads) {
104	>	lock.writeLock().lock();
105	>	assertEquals(threads.length > 0, lock.hasWaiters(c));
106	>	assertEquals(threads.length, lock.getWaitQueueLength(c));
107	>	assertEquals(threads.length == 0, lock.getWaitingThreads(c).isEmpty());
108	>	assertEquals(threads.length, lock.getWaitingThreads(c).size());
109	>	assertEquals(new HashSet<Thread>(lock.getWaitingThreads(c)),
110	>	new HashSet<Thread>(Arrays.asList(threads)));
111	>	lock.writeLock().unlock();
112		}
113
114	<
115	<	public void testTryLockWhenLocked() {
116	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
117	<	lock.writeLock().lock();
118	<	Thread t = new Thread(new Runnable() {
119	<	public void run(){
120	<	assertFalse(lock.writeLock().tryLock());
121	<	}
122	<	});
123	<	try {
124	<	t.start();
125	<	t.join();
114	>	/**
115	>	* Constructor sets given fairness, and is in unlocked state
116	>	*/
117	>	public void testConstructor() {
118	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
119	>	assertFalse(rl.isFair());
120	>	assertFalse(rl.isWriteLocked());
121	>	assertEquals(0, rl.getReadLockCount());
122	>	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
123	>	assertTrue(r2.isFair());
124	>	assertFalse(r2.isWriteLocked());
125	>	assertEquals(0, r2.getReadLockCount());
126	>	ReentrantReadWriteLock r3 = new ReentrantReadWriteLock(false);
127	>	assertFalse(r3.isFair());
128	>	assertFalse(r3.isWriteLocked());
129	>	assertEquals(0, r3.getReadLockCount());
130	>	}
131	>
132	>	/**
133	>	* write-locking and read-locking an unlocked lock succeed
134	>	*/
135	>	public void testLock() {
136	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
137	>	rl.writeLock().lock();
138	>	assertTrue(rl.isWriteLocked());
139	>	assertTrue(rl.isWriteLockedByCurrentThread());
140	>	assertTrue(rl.writeLock().isHeldByCurrentThread());
141	>	assertEquals(0, rl.getReadLockCount());
142	>	rl.writeLock().unlock();
143	>	assertFalse(rl.isWriteLocked());
144	>	assertFalse(rl.isWriteLockedByCurrentThread());
145	>	assertFalse(rl.writeLock().isHeldByCurrentThread());
146	>	assertEquals(0, rl.getReadLockCount());
147	>	rl.readLock().lock();
148	>	assertFalse(rl.isWriteLocked());
149	>	assertFalse(rl.isWriteLockedByCurrentThread());
150	>	assertEquals(1, rl.getReadLockCount());
151	>	rl.readLock().unlock();
152	>	assertFalse(rl.isWriteLocked());
153	>	assertFalse(rl.isWriteLockedByCurrentThread());
154	>	assertEquals(0, rl.getReadLockCount());
155	>	}
156	>
157	>	/**
158	>	* locking an unlocked fair lock succeeds
159	>	*/
160	>	public void testFairLock() {
161	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
162	>	rl.writeLock().lock();
163	>	assertTrue(rl.isWriteLocked());
164	>	assertTrue(rl.isWriteLockedByCurrentThread());
165	>	assertTrue(rl.writeLock().isHeldByCurrentThread());
166	>	assertEquals(0, rl.getReadLockCount());
167	>	rl.writeLock().unlock();
168	>	assertFalse(rl.isWriteLocked());
169	>	assertFalse(rl.isWriteLockedByCurrentThread());
170	>	assertFalse(rl.writeLock().isHeldByCurrentThread());
171	>	assertEquals(0, rl.getReadLockCount());
172	>	rl.readLock().lock();
173	>	assertFalse(rl.isWriteLocked());
174	>	assertFalse(rl.isWriteLockedByCurrentThread());
175	>	assertEquals(1, rl.getReadLockCount());
176	>	rl.readLock().unlock();
177	>	assertFalse(rl.isWriteLocked());
178	>	assertFalse(rl.isWriteLockedByCurrentThread());
179	>	assertEquals(0, rl.getReadLockCount());
180	>	}
181	>
182	>	/**
183	>	* getWriteHoldCount returns number of recursive holds
184	>	*/
185	>	public void testGetWriteHoldCount() {
186	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
187	>	for (int i = 1; i <= SIZE; i++) {
188	>	lock.writeLock().lock();
189	>	assertEquals(i,lock.getWriteHoldCount());
190	>	}
191	>	for (int i = SIZE; i > 0; i--) {
192		lock.writeLock().unlock();
193	<	} catch(Exception e){
142	<	fail("unexpected exception");
193	>	assertEquals(i-1,lock.getWriteHoldCount());
194		}
195	<	}
195	>	}
196
197	<	public void testTryLockWhenLocked2() {
198	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
199	<	lock.writeLock().lock();
200	<	Thread t = new Thread(new Runnable() {
201	<	public void run(){
202	<	assertFalse(lock.readLock().tryLock());
203	<	}
204	<	});
205	<	try {
206	<	t.start();
156	<	t.join();
197	>	/**
198	>	* WriteLock.getHoldCount returns number of recursive holds
199	>	*/
200	>	public void testGetHoldCount() {
201	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
202	>	for (int i = 1; i <= SIZE; i++) {
203	>	lock.writeLock().lock();
204	>	assertEquals(i,lock.writeLock().getHoldCount());
205	>	}
206	>	for (int i = SIZE; i > 0; i--) {
207		lock.writeLock().unlock();
208	<	} catch(Exception e){
159	<	fail("unexpected exception");
208	>	assertEquals(i-1,lock.writeLock().getHoldCount());
209		}
210	<	}
210	>	}
211
212	<	public void testMultipleReadLocks() {
213	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
214	<	lock.readLock().lock();
215	<	Thread t = new Thread(new Runnable() {
216	<	public void run(){
217	<	assertTrue(lock.readLock().tryLock());
218	<	lock.readLock().unlock();
219	<	}
220	<	});
221	<	try {
173	<	t.start();
174	<	t.join();
212	>	/**
213	>	* getReadHoldCount returns number of recursive holds
214	>	*/
215	>	public void testGetReadHoldCount() {
216	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
217	>	for (int i = 1; i <= SIZE; i++) {
218	>	lock.readLock().lock();
219	>	assertEquals(i,lock.getReadHoldCount());
220	>	}
221	>	for (int i = SIZE; i > 0; i--) {
222		lock.readLock().unlock();
223	<	} catch(Exception e){
177	<	fail("unexpected exception");
223	>	assertEquals(i-1,lock.getReadHoldCount());
224		}
225	<	}
180	<
181	<	public void testWriteAfterMultipleReadLocks() {
182	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
183	<	lock.readLock().lock();
184	<	Thread t1 = new Thread(new Runnable() {
185	<	public void run(){
186	<	lock.readLock().lock();
187	<	lock.readLock().unlock();
188	<	}
189	<	});
190	<	Thread t2 = new Thread(new Runnable() {
191	<	public void run(){
192	<	lock.writeLock().lock();
193	<	lock.writeLock().unlock();
194	<	}
195	<	});
225	>	}
226
227	+	/**
228	+	* write-unlocking an unlocked lock throws IllegalMonitorStateException
229	+	*/
230	+	public void testWriteUnlock_IllegalMonitorStateException() {
231	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
232		try {
233	<	t1.start();
234	<	t2.start();
235	<	Thread.sleep(SHORT_DELAY_MS);
236	<	lock.readLock().unlock();
237	<	t1.join(MEDIUM_DELAY_MS);
238	<	t2.join(MEDIUM_DELAY_MS);
239	<	assertTrue(!t1.isAlive());
240	<	assertTrue(!t2.isAlive());
241	<
242	<	} catch(Exception e){
208	<	fail("unexpected exception");
209	<	}
210	<	}
211	<
212	<	public void testReadAfterWriteLock() {
213	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
214	<	lock.writeLock().lock();
215	<	Thread t1 = new Thread(new Runnable() {
216	<	public void run(){
217	<	lock.readLock().lock();
218	<	lock.readLock().unlock();
219	<	}
220	<	});
221	<	Thread t2 = new Thread(new Runnable() {
222	<	public void run(){
223	<	lock.readLock().lock();
224	<	lock.readLock().unlock();
225	<	}
226	<	});
227	<
228	<	try {
229	<	t1.start();
230	<	t2.start();
231	<	Thread.sleep(SHORT_DELAY_MS);
232	<	lock.writeLock().unlock();
233	<	t1.join(MEDIUM_DELAY_MS);
234	<	t2.join(MEDIUM_DELAY_MS);
235	<	assertTrue(!t1.isAlive());
236	<	assertTrue(!t2.isAlive());
237	<
238	<	} catch(Exception e){
239	<	fail("unexpected exception");
240	<	}
241	<	}
242	<
243	<
244	<	public void testTryLockWhenReadLocked() {
245	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
246	<	lock.readLock().lock();
247	<	Thread t = new Thread(new Runnable() {
248	<	public void run(){
249	<	assertTrue(lock.readLock().tryLock());
250	<	lock.readLock().unlock();
251	<	}
252	<	});
233	>	rl.writeLock().unlock();
234	>	shouldThrow();
235	>	} catch (IllegalMonitorStateException success) {}
236	>	}
237	>
238	>	/**
239	>	* read-unlocking an unlocked lock throws IllegalMonitorStateException
240	>	*/
241	>	public void testReadUnlock_IllegalMonitorStateException() {
242	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
243		try {
244	<	t.start();
245	<	t.join();
246	<	lock.readLock().unlock();
247	<	} catch(Exception e){
258	<	fail("unexpected exception");
259	<	}
260	<	}
244	>	rl.readLock().unlock();
245	>	shouldThrow();
246	>	} catch (IllegalMonitorStateException success) {}
247	>	}
248
249	<
249	>	/**
250	>	* write-lockInterruptibly is interruptible
251	>	*/
252	>	public void testWriteLockInterruptibly_Interrupted() throws Exception {
253	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
254	>	lock.writeLock().lock();
255	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
256	>	public void realRun() throws InterruptedException {
257	>	lock.writeLock().lockInterruptibly();
258	>	}});
259	>
260	>	waitForQueuedThread(lock, t);
261	>	t.interrupt();
262	>	awaitTermination(t);
263	>	releaseWriteLock(lock);
264	>	}
265
266	<	public void testWriteTryLockWhenReadLocked() {
267	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
268	<	lock.readLock().lock();
269	<	Thread t = new Thread(new Runnable() {
270	<	public void run(){
271	<	assertFalse(lock.writeLock().tryLock());
272	<	}
273	<	});
274	<	try {
275	<	t.start();
276	<	t.join();
277	<	lock.readLock().unlock();
278	<	} catch(Exception e){
279	<	fail("unexpected exception");
280	<	}
281	<	}
266	>	/**
267	>	* timed write-tryLock is interruptible
268	>	*/
269	>	public void testWriteTryLock_Interrupted() throws InterruptedException {
270	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
271	>	lock.writeLock().lock();
272	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
273	>	public void realRun() throws InterruptedException {
274	>	lock.writeLock().tryLock(LONG_DELAY_MS, MILLISECONDS);
275	>	}});
276	>
277	>	waitForQueuedThread(lock, t);
278	>	t.interrupt();
279	>	awaitTermination(t);
280	>	releaseWriteLock(lock);
281	>	}
282
283	<
283	>	/**
284	>	* read-lockInterruptibly is interruptible
285	>	*/
286	>	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
287	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
288	>	lock.writeLock().lock();
289	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
290	>	public void realRun() throws InterruptedException {
291	>	lock.readLock().lockInterruptibly();
292	>	}});
293	>
294	>	waitForQueuedThread(lock, t);
295	>	t.interrupt();
296	>	awaitTermination(t);
297	>	releaseWriteLock(lock);
298	>	}
299
300	<	public void testTryLock_Timeout(){
301	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
302	<	lock.writeLock().lock();
303	<	Thread t = new Thread(new Runnable() {
304	<	public void run(){
305	<	try {
306	<	assertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
307	<	} catch (Exception ex) {
308	<	fail("unexpected exception");
309	<	}
310	<	}
311	<	});
312	<	try {
313	<	t.start();
314	<	t.join();
315	<	lock.writeLock().unlock();
299	<	} catch(Exception e){
300	<	fail("unexpected exception");
301	<	}
302	<	}
300	>	/**
301	>	* timed read-tryLock is interruptible
302	>	*/
303	>	public void testReadTryLock_Interrupted() throws InterruptedException {
304	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
305	>	lock.writeLock().lock();
306	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
307	>	public void realRun() throws InterruptedException {
308	>	lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS);
309	>	}});
310	>
311	>	waitForQueuedThread(lock, t);
312	>	t.interrupt();
313	>	awaitTermination(t);
314	>	releaseWriteLock(lock);
315	>	}
316
317	<	public void testTryLock_Timeout2(){
318	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
319	<	lock.writeLock().lock();
320	<	Thread t = new Thread(new Runnable() {
321	<	public void run(){
322	<	try {
323	<	assertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
324	<	} catch (Exception ex) {
325	<	fail("unexpected exception");
326	<	}
314	<	}
315	<	});
316	<	try {
317	<	t.start();
318	<	t.join();
319	<	lock.writeLock().unlock();
320	<	} catch(Exception e){
321	<	fail("unexpected exception");
322	<	}
323	<	}
317	>	/**
318	>	* write-tryLock fails if locked
319	>	*/
320	>	public void testWriteTryLockWhenLocked() throws InterruptedException {
321	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
322	>	lock.writeLock().lock();
323	>	Thread t = newStartedThread(new CheckedRunnable() {
324	>	public void realRun() {
325	>	assertFalse(lock.writeLock().tryLock());
326	>	}});
327
328	+	awaitTermination(t);
329	+	releaseWriteLock(lock);
330	+	}
331
332	<	public void testLockInterruptibly() {
333	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
334	<	try {
335	<	lock.writeLock().lockInterruptibly();
336	<	} catch(Exception e) {
337	<	fail("unexpected exception");
338	<	}
339	<	Thread t = new Thread(new Runnable() {
340	<	public void run() {
341	<	try {
342	<	lock.writeLock().lockInterruptibly();
343	<	fail("should throw");
344	<	}
339	<	catch(InterruptedException success) {
340	<	}
341	<	}
342	<	});
343	<	try {
344	<	t.start();
345	<	t.interrupt();
346	<	t.join();
347	<	lock.writeLock().unlock();
348	<	} catch(Exception e){
349	<	fail("unexpected exception");
350	<	}
332	>	/**
333	>	* read-tryLock fails if locked
334	>	*/
335	>	public void testReadTryLockWhenLocked() throws InterruptedException {
336	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
337	>	lock.writeLock().lock();
338	>	Thread t = newStartedThread(new CheckedRunnable() {
339	>	public void realRun() {
340	>	assertFalse(lock.readLock().tryLock());
341	>	}});
342	>
343	>	awaitTermination(t);
344	>	releaseWriteLock(lock);
345		}
346
347	<	public void testLockInterruptibly2() {
348	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
349	<	try {
350	<	lock.writeLock().lockInterruptibly();
351	<	} catch(Exception e) {
352	<	fail("unexpected exception");
353	<	}
354	<	Thread t = new Thread(new Runnable() {
355	<	public void run() {
356	<	try {
357	<	lock.readLock().lockInterruptibly();
358	<	fail("should throw");
359	<	}
360	<	catch(InterruptedException success) {
361	<	}
362	<	}
363	<	});
364	<	try {
365	<	t.start();
366	<	t.interrupt();
367	<	t.join();
368	<	lock.writeLock().unlock();
369	<	} catch(Exception e){
370	<	fail("unexpected exception");
371	<	}
347	>	/**
348	>	* Multiple threads can hold a read lock when not write-locked
349	>	*/
350	>	public void testMultipleReadLocks() throws InterruptedException {
351	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
352	>	lock.readLock().lock();
353	>	Thread t = newStartedThread(new CheckedRunnable() {
354	>	public void realRun() {
355	>	assertTrue(lock.readLock().tryLock());
356	>	lock.readLock().unlock();
357	>	}});
358	>
359	>	awaitTermination(t);
360	>	lock.readLock().unlock();
361	>	}
362	>
363	>	/**
364	>	* A writelock succeeds only after reading threads unlock
365	>	*/
366	>	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
367	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
368	>	lock.readLock().lock();
369	>	Thread t1 = newStartedThread(new CheckedRunnable() {
370	>	public void realRun() {
371	>	lock.readLock().lock();
372	>	lock.readLock().unlock();
373	>	}});
374	>	Thread t2 = newStartedThread(new CheckedRunnable() {
375	>	public void realRun() {
376	>	lock.writeLock().lock();
377	>	lock.writeLock().unlock();
378	>	}});
379	>	delay(SHORT_DELAY_MS);
380	>	lock.readLock().unlock();
381	>	awaitTermination(t1);
382	>	awaitTermination(t2);
383	>	assertNotWriteLocked(lock);
384	>	}
385	>
386	>	/**
387	>	* Readlocks succeed only after a writing thread unlocks
388	>	*/
389	>	public void testReadAfterWriteLock() throws InterruptedException {
390	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
391	>	lock.writeLock().lock();
392	>	Thread t1 = newStartedThread(new CheckedRunnable() {
393	>	public void realRun() {
394	>	lock.readLock().lock();
395	>	lock.readLock().unlock();
396	>	}});
397	>	Thread t2 = newStartedThread(new CheckedRunnable() {
398	>	public void realRun() {
399	>	lock.readLock().lock();
400	>	lock.readLock().unlock();
401	>	}});
402	>
403	>	waitForQueuedThread(lock, t1);
404	>	waitForQueuedThread(lock, t2);
405	>	releaseWriteLock(lock);
406	>	awaitTermination(t1);
407	>	awaitTermination(t2);
408	>	}
409	>
410	>	/**
411	>	* Read trylock succeeds if write locked by current thread
412	>	*/
413	>	public void testReadHoldingWriteLock() {
414	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
415	>	lock.writeLock().lock();
416	>	assertTrue(lock.readLock().tryLock());
417	>	lock.readLock().unlock();
418	>	lock.writeLock().unlock();
419	>	}
420	>
421	>	/**
422	>	* Read lock succeeds if write locked by current thread even if
423	>	* other threads are waiting for readlock
424	>	*/
425	>	public void testReadHoldingWriteLock2() throws InterruptedException {
426	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
427	>	lock.writeLock().lock();
428	>	lock.readLock().lock();
429	>	lock.readLock().unlock();
430	>
431	>	Thread t1 = newStartedThread(new CheckedRunnable() {
432	>	public void realRun() {
433	>	lock.readLock().lock();
434	>	lock.readLock().unlock();
435	>	}});
436	>	Thread t2 = newStartedThread(new CheckedRunnable() {
437	>	public void realRun() {
438	>	lock.readLock().lock();
439	>	lock.readLock().unlock();
440	>	}});
441	>
442	>	waitForQueuedThread(lock, t1);
443	>	waitForQueuedThread(lock, t2);
444	>	assertTrue(lock.isWriteLockedByCurrentThread());
445	>	lock.readLock().lock();
446	>	lock.readLock().unlock();
447	>	releaseWriteLock(lock);
448	>	awaitTermination(t1);
449	>	awaitTermination(t2);
450	>	}
451	>
452	>	/**
453	>	* Read lock succeeds if write locked by current thread even if
454	>	* other threads are waiting for writelock
455	>	*/
456	>	public void testReadHoldingWriteLock3() throws InterruptedException {
457	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
458	>	lock.writeLock().lock();
459	>	lock.readLock().lock();
460	>	lock.readLock().unlock();
461	>
462	>	Thread t1 = newStartedThread(new CheckedRunnable() {
463	>	public void realRun() {
464	>	lock.writeLock().lock();
465	>	lock.writeLock().unlock();
466	>	}});
467	>	Thread t2 = newStartedThread(new CheckedRunnable() {
468	>	public void realRun() {
469	>	lock.writeLock().lock();
470	>	lock.writeLock().unlock();
471	>	}});
472	>
473	>	waitForQueuedThread(lock, t1);
474	>	waitForQueuedThread(lock, t2);
475	>	assertTrue(lock.isWriteLockedByCurrentThread());
476	>	lock.readLock().lock();
477	>	lock.readLock().unlock();
478	>	releaseWriteLock(lock);
479	>	awaitTermination(t1);
480	>	awaitTermination(t2);
481	>	}
482	>
483	>	/**
484	>	* Write lock succeeds if write locked by current thread even if
485	>	* other threads are waiting for writelock
486	>	*/
487	>	public void testWriteHoldingWriteLock4() throws InterruptedException {
488	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
489	>	lock.writeLock().lock();
490	>	lock.writeLock().lock();
491	>	lock.writeLock().unlock();
492	>
493	>	Thread t1 = newStartedThread(new CheckedRunnable() {
494	>	public void realRun() {
495	>	lock.writeLock().lock();
496	>	lock.writeLock().unlock();
497	>	}});
498	>	Thread t2 = newStartedThread(new CheckedRunnable() {
499	>	public void realRun() {
500	>	lock.writeLock().lock();
501	>	lock.writeLock().unlock();
502	>	}});
503	>
504	>	waitForQueuedThread(lock, t1);
505	>	waitForQueuedThread(lock, t2);
506	>	assertTrue(lock.isWriteLockedByCurrentThread());
507	>	assertEquals(1, lock.getWriteHoldCount());
508	>	lock.writeLock().lock();
509	>	assertTrue(lock.isWriteLockedByCurrentThread());
510	>	assertEquals(2, lock.getWriteHoldCount());
511	>	lock.writeLock().unlock();
512	>	releaseWriteLock(lock);
513	>	awaitTermination(t1);
514	>	awaitTermination(t2);
515	>	}
516	>
517	>	/**
518	>	* Fair Read trylock succeeds if write locked by current thread
519	>	*/
520	>	public void testReadHoldingWriteLockFair() {
521	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
522	>	lock.writeLock().lock();
523	>	assertTrue(lock.readLock().tryLock());
524	>	lock.readLock().unlock();
525	>	lock.writeLock().unlock();
526	>	}
527	>
528	>	/**
529	>	* Fair Read lock succeeds if write locked by current thread even if
530	>	* other threads are waiting for readlock
531	>	*/
532	>	public void testReadHoldingWriteLockFair2() throws InterruptedException {
533	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
534	>	lock.writeLock().lock();
535	>	lock.readLock().lock();
536	>	lock.readLock().unlock();
537	>
538	>	Thread t1 = newStartedThread(new CheckedRunnable() {
539	>	public void realRun() {
540	>	lock.readLock().lock();
541	>	lock.readLock().unlock();
542	>	}});
543	>	Thread t2 = newStartedThread(new CheckedRunnable() {
544	>	public void realRun() {
545	>	lock.readLock().lock();
546	>	lock.readLock().unlock();
547	>	}});
548	>
549	>	waitForQueuedThread(lock, t1);
550	>	waitForQueuedThread(lock, t2);
551	>	assertTrue(lock.isWriteLockedByCurrentThread());
552	>	lock.readLock().lock();
553	>	lock.readLock().unlock();
554	>	releaseWriteLock(lock);
555	>	awaitTermination(t1);
556	>	awaitTermination(t2);
557	>	}
558	>
559	>	/**
560	>	* Fair Read lock succeeds if write locked by current thread even if
561	>	* other threads are waiting for writelock
562	>	*/
563	>	public void testReadHoldingWriteLockFair3() throws InterruptedException {
564	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
565	>	lock.writeLock().lock();
566	>	lock.readLock().lock();
567	>	lock.readLock().unlock();
568	>
569	>	Thread t1 = newStartedThread(new CheckedRunnable() {
570	>	public void realRun() {
571	>	lock.writeLock().lock();
572	>	lock.writeLock().unlock();
573	>	}});
574	>	Thread t2 = newStartedThread(new CheckedRunnable() {
575	>	public void realRun() {
576	>	lock.writeLock().lock();
577	>	lock.writeLock().unlock();
578	>	}});
579	>
580	>	waitForQueuedThread(lock, t1);
581	>	waitForQueuedThread(lock, t2);
582	>	assertTrue(lock.isWriteLockedByCurrentThread());
583	>	lock.readLock().lock();
584	>	lock.readLock().unlock();
585	>	releaseWriteLock(lock);
586	>	awaitTermination(t1);
587	>	awaitTermination(t2);
588	>	}
589	>
590	>	/**
591	>	* Fair Write lock succeeds if write locked by current thread even if
592	>	* other threads are waiting for writelock
593	>	*/
594	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
595	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
596	>	lock.writeLock().lock();
597	>	Thread t1 = newStartedThread(new CheckedRunnable() {
598	>	public void realRun() {
599	>	lock.writeLock().lock();
600	>	lock.writeLock().unlock();
601	>	}});
602	>	Thread t2 = newStartedThread(new CheckedRunnable() {
603	>	public void realRun() {
604	>	lock.writeLock().lock();
605	>	lock.writeLock().unlock();
606	>	}});
607	>
608	>	waitForQueuedThread(lock, t1);
609	>	waitForQueuedThread(lock, t2);
610	>	assertTrue(lock.isWriteLockedByCurrentThread());
611	>	assertEquals(1, lock.getWriteHoldCount());
612	>	lock.writeLock().lock();
613	>	assertEquals(2, lock.getWriteHoldCount());
614	>	lock.writeLock().unlock();
615	>	lock.writeLock().lock();
616	>	lock.writeLock().unlock();
617	>	releaseWriteLock(lock);
618	>	awaitTermination(t1);
619	>	awaitTermination(t2);
620	>	}
621	>
622	>	/**
623	>	* Read tryLock succeeds if readlocked but not writelocked
624	>	*/
625	>	public void testTryLockWhenReadLocked() throws InterruptedException {
626	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
627	>	lock.readLock().lock();
628	>	Thread t = newStartedThread(new CheckedRunnable() {
629	>	public void realRun() {
630	>	assertTrue(lock.readLock().tryLock());
631	>	lock.readLock().unlock();
632	>	}});
633	>
634	>	awaitTermination(t);
635	>	lock.readLock().unlock();
636	>	}
637	>
638	>	/**
639	>	* write tryLock fails when readlocked
640	>	*/
641	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
642	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
643	>	lock.readLock().lock();
644	>	Thread t = newStartedThread(new CheckedRunnable() {
645	>	public void realRun() {
646	>	assertFalse(lock.writeLock().tryLock());
647	>	}});
648	>
649	>	awaitTermination(t);
650	>	lock.readLock().unlock();
651	>	}
652	>
653	>	/**
654	>	* Fair Read tryLock succeeds if readlocked but not writelocked
655	>	*/
656	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
657	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
658	>	lock.readLock().lock();
659	>	Thread t = newStartedThread(new CheckedRunnable() {
660	>	public void realRun() {
661	>	assertTrue(lock.readLock().tryLock());
662	>	lock.readLock().unlock();
663	>	}});
664	>
665	>	awaitTermination(t);
666	>	lock.readLock().unlock();
667	>	}
668	>
669	>	/**
670	>	* Fair write tryLock fails when readlocked
671	>	*/
672	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
673	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
674	>	lock.readLock().lock();
675	>	Thread t = newStartedThread(new CheckedRunnable() {
676	>	public void realRun() {
677	>	assertFalse(lock.writeLock().tryLock());
678	>	}});
679	>
680	>	awaitTermination(t);
681	>	lock.readLock().unlock();
682	>	}
683	>
684	>	/**
685	>	* write timed tryLock times out if locked
686	>	*/
687	>	public void testWriteTryLock_Timeout() throws InterruptedException {
688	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
689	>	lock.writeLock().lock();
690	>	Thread t = newStartedThread(new CheckedRunnable() {
691	>	public void realRun() throws InterruptedException {
692	>	assertFalse(lock.writeLock().tryLock(1, MILLISECONDS));
693	>	}});
694	>
695	>	awaitTermination(t);
696	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
697	>	lock.writeLock().unlock();
698	>	}
699	>
700	>	/**
701	>	* read timed tryLock times out if write-locked
702	>	*/
703	>	public void testReadTryLock_Timeout() throws InterruptedException {
704	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
705	>	lock.writeLock().lock();
706	>	Thread t = newStartedThread(new CheckedRunnable() {
707	>	public void realRun() throws InterruptedException {
708	>	assertFalse(lock.readLock().tryLock(1, MILLISECONDS));
709	>	}});
710	>
711	>	awaitTermination(t);
712	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
713	>	lock.writeLock().unlock();
714	>	}
715	>
716	>	/**
717	>	* write lockInterruptibly succeeds if lock free else is interruptible
718	>	*/
719	>	public void testWriteLockInterruptibly() throws InterruptedException {
720	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
721	>	lock.writeLock().lockInterruptibly();
722	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
723	>	public void realRun() throws InterruptedException {
724	>	lock.writeLock().lockInterruptibly();
725	>	}});
726	>
727	>	waitForQueuedThread(lock, t);
728	>	t.interrupt();
729	>	awaitTermination(t);
730	>	releaseWriteLock(lock);
731	>	}
732	>
733	>	/**
734	>	* read lockInterruptibly succeeds if lock free else is interruptible
735	>	*/
736	>	public void testReadLockInterruptibly() throws InterruptedException {
737	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
738	>	lock.writeLock().lockInterruptibly();
739	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
740	>	public void realRun() throws InterruptedException {
741	>	lock.readLock().lockInterruptibly();
742	>	}});
743	>
744	>	waitForQueuedThread(lock, t);
745	>	t.interrupt();
746	>	awaitTermination(t);
747	>	releaseWriteLock(lock);
748		}
749
750	<	public void testAwait_IllegalMonitor() {
751	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
750	>	/**
751	>	* Calling await without holding lock throws IllegalMonitorStateException
752	>	*/
753	>	public void testAwait_IllegalMonitor() throws InterruptedException {
754	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
755		final Condition c = lock.writeLock().newCondition();
756		try {
757		c.await();
758	<	fail("should throw");
759	<	}
760	<	catch (IllegalMonitorStateException success) {
761	<	}
762	<	catch (Exception ex) {
763	<	fail("should throw IMSE");
764	<	}
758	>	shouldThrow();
759	>	} catch (IllegalMonitorStateException success) {}
760	>	try {
761	>	c.await(LONG_DELAY_MS, MILLISECONDS);
762	>	shouldThrow();
763	>	} catch (IllegalMonitorStateException success) {}
764	>	try {
765	>	c.awaitNanos(100);
766	>	shouldThrow();
767	>	} catch (IllegalMonitorStateException success) {}
768	>	try {
769	>	c.awaitUninterruptibly();
770	>	shouldThrow();
771	>	} catch (IllegalMonitorStateException success) {}
772		}
773
774	+	/**
775	+	* Calling signal without holding lock throws IllegalMonitorStateException
776	+	*/
777		public void testSignal_IllegalMonitor() {
778	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
778	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
779		final Condition c = lock.writeLock().newCondition();
780		try {
781		c.signal();
782	<	fail("should throw");
783	<	}
401	<	catch (IllegalMonitorStateException success) {
402	<	}
403	<	catch (Exception ex) {
404	<	fail("should throw IMSE");
405	<	}
782	>	shouldThrow();
783	>	} catch (IllegalMonitorStateException success) {}
784		}
785
786	<	public void testAwaitNanos_Timeout() {
787	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
786	>	/**
787	>	* Calling signalAll without holding lock throws IllegalMonitorStateException
788	>	*/
789	>	public void testSignalAll_IllegalMonitor() {
790	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
791		final Condition c = lock.writeLock().newCondition();
792		try {
793	<	lock.writeLock().lock();
794	<	long t = c.awaitNanos(100);
795	<	assertTrue(t <= 0);
415	<	lock.writeLock().unlock();
416	<	}
417	<	catch (Exception ex) {
418	<	fail("unexpected exception");
419	<	}
793	>	c.signalAll();
794	>	shouldThrow();
795	>	} catch (IllegalMonitorStateException success) {}
796		}
797
798	<	public void testAwait_Timeout() {
799	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
798	>	/**
799	>	* awaitNanos without a signal times out
800	>	*/
801	>	public void testAwaitNanos_Timeout() throws InterruptedException {
802	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
803		final Condition c = lock.writeLock().newCondition();
804	<	try {
805	<	lock.writeLock().lock();
806	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
807	<	lock.writeLock().unlock();
808	<	}
809	<	catch (Exception ex) {
810	<	fail("unexpected exception");
811	<	}
804	>	lock.writeLock().lock();
805	>	long startTime = System.nanoTime();
806	>	long timeoutMillis = 10;
807	>	long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis);
808	>	long nanosRemaining = c.awaitNanos(timeoutNanos);
809	>	assertTrue(nanosRemaining <= 0);
810	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
811	>	lock.writeLock().unlock();
812		}
813
814	<	public void testAwaitUntil_Timeout() {
815	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
814	>	/**
815	>	* timed await without a signal times out
816	>	*/
817	>	public void testAwait_Timeout() throws InterruptedException {
818	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
819		final Condition c = lock.writeLock().newCondition();
820	<	try {
821	<	lock.writeLock().lock();
822	<	java.util.Date d = new java.util.Date();
823	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
824	<	lock.writeLock().unlock();
825	<	}
444	<	catch (Exception ex) {
445	<	fail("unexpected exception");
446	<	}
820	>	lock.writeLock().lock();
821	>	long startTime = System.nanoTime();
822	>	long timeoutMillis = 10;
823	>	assertFalse(c.await(timeoutMillis, MILLISECONDS));
824	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
825	>	lock.writeLock().unlock();
826		}
827
828	<	public void testAwait() {
829	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
828	>	/**
829	>	* awaitUntil without a signal times out
830	>	*/
831	>	public void testAwaitUntil_Timeout() throws InterruptedException {
832	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
833		final Condition c = lock.writeLock().newCondition();
834	<	Thread t = new Thread(new Runnable() {
835	<	public void run() {
836	<	try {
837	<	lock.writeLock().lock();
838	<	c.await();
457	<	lock.writeLock().unlock();
458	<	}
459	<	catch(InterruptedException e) {
460	<	fail("unexpected exception");
461	<	}
462	<	}
463	<	});
834	>	lock.writeLock().lock();
835	>	java.util.Date d = new java.util.Date();
836	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
837	>	lock.writeLock().unlock();
838	>	}
839
840	<	try {
841	<	t.start();
842	<	Thread.sleep(SHORT_DELAY_MS);
843	<	lock.writeLock().lock();
844	<	c.signal();
845	<	lock.writeLock().unlock();
846	<	t.join(SHORT_DELAY_MS);
847	<	assertFalse(t.isAlive());
848	<	}
849	<	catch (Exception ex) {
850	<	fail("unexpected exception");
851	<	}
840	>	/**
841	>	* await returns when signalled
842	>	*/
843	>	public void testAwait() throws InterruptedException {
844	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
845	>	final Condition c = lock.writeLock().newCondition();
846	>	final CountDownLatch locked = new CountDownLatch(1);
847	>	Thread t = newStartedThread(new CheckedRunnable() {
848	>	public void realRun() throws InterruptedException {
849	>	lock.writeLock().lock();
850	>	locked.countDown();
851	>	c.await();
852	>	lock.writeLock().unlock();
853	>	}});
854	>
855	>	locked.await();
856	>	lock.writeLock().lock();
857	>	c.signal();
858	>	assertTrue(t.isAlive());
859	>	lock.writeLock().unlock();
860	>	awaitTermination(t);
861		}
862
863	<	public void testAwaitUninterruptibly() {
864	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
863	>	/**
864	>	* awaitUninterruptibly doesn't abort on interrupt
865	>	*/
866	>	public void testAwaitUninterruptibly() throws InterruptedException {
867	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
868		final Condition c = lock.writeLock().newCondition();
869	<	Thread t = new Thread(new Runnable() {
870	<	public void run() {
871	<	lock.writeLock().lock();
872	<	c.awaitUninterruptibly();
869	>	final CountDownLatch locked = new CountDownLatch(1);
870	>	final AtomicBoolean canAwake = new AtomicBoolean(false);
871	>	Thread t = newStartedThread(new CheckedRunnable() {
872	>	public void realRun() {
873	>	lock.writeLock().lock();
874	>	locked.countDown();
875	>	c.awaitUninterruptibly();
876	>	assertTrue(Thread.interrupted());
877	>	lock.writeLock().unlock();
878	>	}});
879	>
880	>	locked.await();
881	>	lock.writeLock().lock();
882	>	lock.writeLock().unlock();
883	>	t.interrupt();
884	>	t.join(10);
885	>	assertTrue(t.isAlive());
886	>	lock.writeLock().lock();
887	>	c.signal();
888	>	lock.writeLock().unlock();
889	>	awaitTermination(t);
890	>	}
891	>
892	>	/**
893	>	* await is interruptible
894	>	*/
895	>	public void testAwait_Interrupt() throws InterruptedException {
896	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
897	>	final Condition c = lock.writeLock().newCondition();
898	>	final CountDownLatch locked = new CountDownLatch(1);
899	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
900	>	public void realRun() throws InterruptedException {
901	>	lock.writeLock().lock();
902	>	assertTrue(lock.isWriteLocked());
903	>	assertTrue(lock.isWriteLockedByCurrentThread());
904	>	assertHasNoWaiters(lock, c);
905	>	locked.countDown();
906	>	try {
907	>	c.await();
908	>	} finally {
909	>	assertTrue(lock.isWriteLocked());
910	>	assertTrue(lock.isWriteLockedByCurrentThread());
911	>	assertHasNoWaiters(lock, c);
912		lock.writeLock().unlock();
913	<	}
914	<	});
913	>	assertFalse(Thread.interrupted());
914	>	}
915	>	}});
916	>
917	>	locked.await();
918	>	assertHasWaiters(lock, c, t);
919	>	t.interrupt();
920	>	awaitTermination(t);
921	>	assertFalse(lock.isWriteLocked());
922	>	}
923
924	<	try {
925	<	t.start();
926	<	Thread.sleep(SHORT_DELAY_MS);
927	<	t.interrupt();
928	<	lock.writeLock().lock();
929	<	c.signal();
930	<	lock.writeLock().unlock();
931	<	t.join(SHORT_DELAY_MS);
932	<	assertFalse(t.isAlive());
933	<	}
934	<	catch (Exception ex) {
935	<	fail("unexpected exception");
936	<	}
924	>	/**
925	>	* awaitNanos is interruptible
926	>	*/
927	>	public void testAwaitNanos_Interrupt() throws InterruptedException {
928	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
929	>	final Condition c = lock.writeLock().newCondition();
930	>	final CountDownLatch locked = new CountDownLatch(1);
931	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
932	>	public void realRun() throws InterruptedException {
933	>	lock.writeLock().lock();
934	>	assertTrue(lock.isWriteLocked());
935	>	assertTrue(lock.isWriteLockedByCurrentThread());
936	>	assertHasNoWaiters(lock, c);
937	>	locked.countDown();
938	>	try {
939	>	c.awaitNanos(MILLISECONDS.toNanos(LONG_DELAY_MS));
940	>	} finally {
941	>	assertTrue(lock.isWriteLocked());
942	>	assertTrue(lock.isWriteLockedByCurrentThread());
943	>	assertHasNoWaiters(lock, c);
944	>	lock.writeLock().unlock();
945	>	assertFalse(Thread.interrupted());
946	>	}
947	>	}});
948	>
949	>	locked.await();
950	>	assertHasWaiters(lock, c, t);
951	>	t.interrupt();
952	>	awaitTermination(t);
953	>	assertFalse(lock.isWriteLocked());
954		}
955
956	<	public void testAwait_Interrupt() {
957	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
958	<	final Condition c = lock.writeLock().newCondition();
959	<	Thread t = new Thread(new Runnable() {
960	<	public void run() {
961	<	try {
962	<	lock.writeLock().lock();
963	<	c.await();
964	<	lock.writeLock().unlock();
965	<	fail("should throw");
966	<	}
967	<	catch(InterruptedException success) {
968	<	}
969	<	}
970	<	});
971	<
972	<	try {
973	<	t.start();
974	<	Thread.sleep(SHORT_DELAY_MS);
975	<	t.interrupt();
976	<	t.join(SHORT_DELAY_MS);
977	<	assertFalse(t.isAlive());
978	<	}
979	<	catch (Exception ex) {
980	<	fail("unexpected exception");
981	<	}
982	<	}
983	<
984	<	public void testAwaitNanos_Interrupt() {
985	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
986	<	final Condition c = lock.writeLock().newCondition();
987	<	Thread t = new Thread(new Runnable() {
988	<	public void run() {
989	<	try {
990	<	lock.writeLock().lock();
991	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
992	<	lock.writeLock().unlock();
993	<	fail("should throw");
994	<	}
995	<	catch(InterruptedException success) {
996	<	}
997	<	}
998	<	});
999	<
1000	<	try {
1001	<	t.start();
1002	<	Thread.sleep(SHORT_DELAY_MS);
1003	<	t.interrupt();
1004	<	t.join(SHORT_DELAY_MS);
1005	<	assertFalse(t.isAlive());
1006	<	}
1007	<	catch (Exception ex) {
1008	<	fail("unexpected exception");
1009	<	}
1010	<	}
1011	<
1012	<	public void testAwaitUntil_Interrupt() {
1013	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1014	<	final Condition c = lock.writeLock().newCondition();
1015	<	Thread t = new Thread(new Runnable() {
1016	<	public void run() {
1017	<	try {
1018	<	lock.writeLock().lock();
1019	<	java.util.Date d = new java.util.Date();
1020	<	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
1021	<	lock.writeLock().unlock();
1022	<	fail("should throw");
1023	<	}
1024	<	catch(InterruptedException success) {
1025	<	}
1026	<	}
1027	<	});
1028	<
1029	<	try {
1030	<	t.start();
1031	<	Thread.sleep(SHORT_DELAY_MS);
1032	<	t.interrupt();
1033	<	t.join(SHORT_DELAY_MS);
1034	<	assertFalse(t.isAlive());
1035	<	}
1036	<	catch (Exception ex) {
1037	<	fail("unexpected exception");
1038	<	}
1039	<	}
1040	<
1041	<	public void testSignalAll() {
1042	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1043	<	final Condition c = lock.writeLock().newCondition();
1044	<	Thread t1 = new Thread(new Runnable() {
1045	<	public void run() {
1046	<	try {
1047	<	lock.writeLock().lock();
1048	<	c.await();
1049	<	lock.writeLock().unlock();
1050	<	}
1051	<	catch(InterruptedException e) {
1052	<	fail("unexpected exception");
1053	<	}
1054	<	}
1055	<	});
1056	<
1057	<	Thread t2 = new Thread(new Runnable() {
1058	<	public void run() {
1059	<	try {
1060	<	lock.writeLock().lock();
1061	<	c.await();
1062	<	lock.writeLock().unlock();
1063	<	}
1064	<	catch(InterruptedException e) {
1065	<	fail("unexpected exception");
615	<	}
616	<	}
617	<	});
618	<
619	<	try {
620	<	t1.start();
621	<	t2.start();
622	<	Thread.sleep(SHORT_DELAY_MS);
623	<	lock.writeLock().lock();
624	<	c.signalAll();
625	<	lock.writeLock().unlock();
626	<	t1.join(SHORT_DELAY_MS);
627	<	t2.join(SHORT_DELAY_MS);
628	<	assertFalse(t1.isAlive());
629	<	assertFalse(t2.isAlive());
630	<	}
631	<	catch (Exception ex) {
632	<	fail("unexpected exception");
633	<	}
956	>	/**
957	>	* awaitUntil is interruptible
958	>	*/
959	>	public void testAwaitUntil_Interrupt() throws InterruptedException {
960	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
961	>	final Condition c = lock.writeLock().newCondition();
962	>	final CountDownLatch locked = new CountDownLatch(1);
963	>	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
964	>	public void realRun() throws InterruptedException {
965	>	lock.writeLock().lock();
966	>	assertTrue(lock.isWriteLocked());
967	>	assertTrue(lock.isWriteLockedByCurrentThread());
968	>	assertHasNoWaiters(lock, c);
969	>	locked.countDown();
970	>	java.util.Date d = new java.util.Date();
971	>	try {
972	>	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
973	>	} finally {
974	>	assertTrue(lock.isWriteLocked());
975	>	assertTrue(lock.isWriteLockedByCurrentThread());
976	>	assertHasNoWaiters(lock, c);
977	>	lock.writeLock().unlock();
978	>	assertFalse(Thread.interrupted());
979	>	}
980	>	}});
981	>
982	>	locked.await();
983	>	assertHasWaiters(lock, c, t);
984	>	t.interrupt();
985	>	awaitTermination(t);
986	>	assertFalse(lock.isWriteLocked());
987	>	}
988	>
989	>	/**
990	>	* signalAll wakes up all threads
991	>	*/
992	>	public void testSignalAll() throws InterruptedException {
993	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
994	>	final Condition c = lock.writeLock().newCondition();
995	>	final CountDownLatch locked = new CountDownLatch(2);
996	>	final Lock writeLock = lock.writeLock();
997	>	Thread t1 = newStartedThread(new CheckedRunnable() {
998	>	public void realRun() throws InterruptedException {
999	>	writeLock.lock();
1000	>	locked.countDown();
1001	>	c.await();
1002	>	writeLock.unlock();
1003	>	}});
1004	>
1005	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1006	>	public void realRun() throws InterruptedException {
1007	>	writeLock.lock();
1008	>	locked.countDown();
1009	>	c.await();
1010	>	writeLock.unlock();
1011	>	}});
1012	>
1013	>	locked.await();
1014	>	writeLock.lock();
1015	>	assertHasWaiters(lock, c, t1, t2);
1016	>	c.signalAll();
1017	>	assertHasNoWaiters(lock, c);
1018	>	writeLock.unlock();
1019	>	awaitTermination(t1);
1020	>	awaitTermination(t2);
1021	>	}
1022	>
1023	>	/**
1024	>	* signal wakes up waiting threads in FIFO order.
1025	>	*/
1026	>	public void testSignalWakesFifo() throws InterruptedException {
1027	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1028	>	final Condition c = lock.writeLock().newCondition();
1029	>	final CountDownLatch locked1 = new CountDownLatch(1);
1030	>	final CountDownLatch locked2 = new CountDownLatch(1);
1031	>	final Lock writeLock = lock.writeLock();
1032	>	Thread t1 = newStartedThread(new CheckedRunnable() {
1033	>	public void realRun() throws InterruptedException {
1034	>	writeLock.lock();
1035	>	locked1.countDown();
1036	>	c.await();
1037	>	writeLock.unlock();
1038	>	}});
1039	>
1040	>	locked1.await();
1041	>
1042	>	Thread t2 = newStartedThread(new CheckedRunnable() {
1043	>	public void realRun() throws InterruptedException {
1044	>	writeLock.lock();
1045	>	locked2.countDown();
1046	>	c.await();
1047	>	writeLock.unlock();
1048	>	}});
1049	>
1050	>	locked2.await();
1051	>
1052	>	writeLock.lock();
1053	>	assertHasWaiters(lock, c, t1, t2);
1054	>	assertFalse(lock.hasQueuedThreads());
1055	>	c.signal();
1056	>	assertHasWaiters(lock, c, t2);
1057	>	assertTrue(lock.hasQueuedThread(t1));
1058	>	assertFalse(lock.hasQueuedThread(t2));
1059	>	c.signal();
1060	>	assertHasNoWaiters(lock, c);
1061	>	assertTrue(lock.hasQueuedThread(t1));
1062	>	assertTrue(lock.hasQueuedThread(t2));
1063	>	writeLock.unlock();
1064	>	awaitTermination(t1);
1065	>	awaitTermination(t2);
1066		}
1067
1068	<	public void testSerialization() {
1068	>	/**
1069	>	* A serialized lock deserializes as unlocked
1070	>	*/
1071	>	public void testSerialization() throws Exception {
1072		ReentrantReadWriteLock l = new ReentrantReadWriteLock();
1073		l.readLock().lock();
1074		l.readLock().unlock();
1075
1076	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1077	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1078	+	out.writeObject(l);
1079	+	out.close();
1080	+
1081	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1082	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1083	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1084	+	r.readLock().lock();
1085	+	r.readLock().unlock();
1086	+	}
1087	+
1088	+	/**
1089	+	* hasQueuedThreads reports whether there are waiting threads
1090	+	*/
1091	+	public void testhasQueuedThreads() throws InterruptedException {
1092	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1093	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1094	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1095	+	assertFalse(lock.hasQueuedThreads());
1096	+	lock.writeLock().lock();
1097	+	assertFalse(lock.hasQueuedThreads());
1098	+	long startTime = System.nanoTime();
1099	+	t1.start();
1100	+	waitForQueuedThread(lock, t1);
1101	+	t2.start();
1102	+	waitForQueuedThread(lock, t2);
1103	+	assertTrue(lock.hasQueuedThreads());
1104	+	t1.interrupt();
1105	+	awaitTermination(t1);
1106	+	assertTrue(lock.hasQueuedThreads());
1107	+	lock.writeLock().unlock();
1108	+	awaitTermination(t2);
1109	+	assertFalse(lock.hasQueuedThreads());
1110	+	}
1111	+
1112	+	/**
1113	+	* hasQueuedThread(null) throws NPE
1114	+	*/
1115	+	public void testHasQueuedThreadNPE() {
1116	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1117		try {
1118	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1119	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1120	<	out.writeObject(l);
1121	<	out.close();
1122	<
1123	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1124	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1125	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1126	<	r.readLock().lock();
1127	<	r.readLock().unlock();
1128	<	} catch(Exception e){
1129	<	e.printStackTrace();
1130	<	fail("unexpected exception");
1131	<	}
1118	>	sync.hasQueuedThread(null);
1119	>	shouldThrow();
1120	>	} catch (NullPointerException success) {}
1121	>	}
1122	>
1123	>	/**
1124	>	* hasQueuedThread reports whether a thread is queued.
1125	>	*/
1126	>	public void testHasQueuedThread() throws InterruptedException {
1127	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1128	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1129	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1130	>	assertFalse(lock.hasQueuedThread(t1));
1131	>	assertFalse(lock.hasQueuedThread(t2));
1132	>	lock.writeLock().lock();
1133	>	long startTime = System.nanoTime();
1134	>	t1.start();
1135	>	waitForQueuedThread(lock, t1);
1136	>	assertTrue(lock.hasQueuedThread(t1));
1137	>	assertFalse(lock.hasQueuedThread(t2));
1138	>	t2.start();
1139	>	waitForQueuedThread(lock, t2);
1140	>	assertTrue(lock.hasQueuedThread(t1));
1141	>	assertTrue(lock.hasQueuedThread(t2));
1142	>	t1.interrupt();
1143	>	awaitTermination(t1);
1144	>	assertFalse(lock.hasQueuedThread(t1));
1145	>	assertTrue(lock.hasQueuedThread(t2));
1146	>	lock.writeLock().unlock();
1147	>	awaitTermination(t2);
1148	>	assertFalse(lock.hasQueuedThread(t1));
1149	>	assertFalse(lock.hasQueuedThread(t2));
1150	>	}
1151	>
1152	>	/**
1153	>	* getQueueLength reports number of waiting threads
1154	>	*/
1155	>	public void testGetQueueLength() throws InterruptedException {
1156	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1157	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1158	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1159	>	assertEquals(0, lock.getQueueLength());
1160	>	lock.writeLock().lock();
1161	>	long startTime = System.nanoTime();
1162	>	t1.start();
1163	>	waitForQueuedThread(lock, t1);
1164	>	assertEquals(1, lock.getQueueLength());
1165	>	t2.start();
1166	>	waitForQueuedThread(lock, t2);
1167	>	assertEquals(2, lock.getQueueLength());
1168	>	t1.interrupt();
1169	>	awaitTermination(t1);
1170	>	assertEquals(1, lock.getQueueLength());
1171	>	lock.writeLock().unlock();
1172	>	awaitTermination(t2);
1173	>	assertEquals(0, lock.getQueueLength());
1174	>	}
1175	>
1176	>	/**
1177	>	* getQueuedThreads includes waiting threads
1178	>	*/
1179	>	public void testGetQueuedThreads() throws InterruptedException {
1180	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1181	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1182	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1183	>	assertTrue(lock.getQueuedThreads().isEmpty());
1184	>	lock.writeLock().lock();
1185	>	long startTime = System.nanoTime();
1186	>	assertTrue(lock.getQueuedThreads().isEmpty());
1187	>	t1.start();
1188	>	waitForQueuedThread(lock, t1);
1189	>	assertEquals(1, lock.getQueuedThreads().size());
1190	>	assertTrue(lock.getQueuedThreads().contains(t1));
1191	>	t2.start();
1192	>	waitForQueuedThread(lock, t2);
1193	>	assertEquals(2, lock.getQueuedThreads().size());
1194	>	assertTrue(lock.getQueuedThreads().contains(t1));
1195	>	assertTrue(lock.getQueuedThreads().contains(t2));
1196	>	t1.interrupt();
1197	>	awaitTermination(t1);
1198	>	assertFalse(lock.getQueuedThreads().contains(t1));
1199	>	assertTrue(lock.getQueuedThreads().contains(t2));
1200	>	assertEquals(1, lock.getQueuedThreads().size());
1201	>	lock.writeLock().unlock();
1202	>	awaitTermination(t2);
1203	>	assertTrue(lock.getQueuedThreads().isEmpty());
1204	>	}
1205	>
1206	>	/**
1207	>	* hasWaiters throws NPE if null
1208	>	*/
1209	>	public void testHasWaitersNPE() {
1210	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1211	>	try {
1212	>	lock.hasWaiters(null);
1213	>	shouldThrow();
1214	>	} catch (NullPointerException success) {}
1215	>	}
1216	>
1217	>	/**
1218	>	* getWaitQueueLength throws NPE if null
1219	>	*/
1220	>	public void testGetWaitQueueLengthNPE() {
1221	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1222	>	try {
1223	>	lock.getWaitQueueLength(null);
1224	>	shouldThrow();
1225	>	} catch (NullPointerException success) {}
1226	>	}
1227	>
1228	>	/**
1229	>	* getWaitingThreads throws NPE if null
1230	>	*/
1231	>	public void testGetWaitingThreadsNPE() {
1232	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1233	>	try {
1234	>	lock.getWaitingThreads(null);
1235	>	shouldThrow();
1236	>	} catch (NullPointerException success) {}
1237	>	}
1238	>
1239	>	/**
1240	>	* hasWaiters throws IAE if not owned
1241	>	*/
1242	>	public void testHasWaitersIAE() {
1243	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1244	>	final Condition c = lock.writeLock().newCondition();
1245	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1246	>	try {
1247	>	lock2.hasWaiters(c);
1248	>	shouldThrow();
1249	>	} catch (IllegalArgumentException success) {}
1250	>	}
1251	>
1252	>	/**
1253	>	* hasWaiters throws IMSE if not locked
1254	>	*/
1255	>	public void testHasWaitersIMSE() {
1256	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1257	>	final Condition c = lock.writeLock().newCondition();
1258	>	try {
1259	>	lock.hasWaiters(c);
1260	>	shouldThrow();
1261	>	} catch (IllegalMonitorStateException success) {}
1262	>	}
1263	>
1264	>	/**
1265	>	* getWaitQueueLength throws IAE if not owned
1266	>	*/
1267	>	public void testGetWaitQueueLengthIAE() {
1268	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1269	>	final Condition c = lock.writeLock().newCondition();
1270	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1271	>	try {
1272	>	lock2.getWaitQueueLength(c);
1273	>	shouldThrow();
1274	>	} catch (IllegalArgumentException success) {}
1275		}
1276
1277	+	/**
1278	+	* getWaitQueueLength throws IMSE if not locked
1279	+	*/
1280	+	public void testGetWaitQueueLengthIMSE() {
1281	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1282	+	final Condition c = lock.writeLock().newCondition();
1283	+	try {
1284	+	lock.getWaitQueueLength(c);
1285	+	shouldThrow();
1286	+	} catch (IllegalMonitorStateException success) {}
1287	+	}
1288	+
1289	+	/**
1290	+	* getWaitingThreads throws IAE if not owned
1291	+	*/
1292	+	public void testGetWaitingThreadsIAE() {
1293	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1294	+	final Condition c = lock.writeLock().newCondition();
1295	+	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1296	+	try {
1297	+	lock2.getWaitingThreads(c);
1298	+	shouldThrow();
1299	+	} catch (IllegalArgumentException success) {}
1300	+	}
1301	+
1302	+	/**
1303	+	* getWaitingThreads throws IMSE if not locked
1304	+	*/
1305	+	public void testGetWaitingThreadsIMSE() {
1306	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1307	+	final Condition c = lock.writeLock().newCondition();
1308	+	try {
1309	+	lock.getWaitingThreads(c);
1310	+	shouldThrow();
1311	+	} catch (IllegalMonitorStateException success) {}
1312	+	}
1313	+
1314	+	/**
1315	+	* hasWaiters returns true when a thread is waiting, else false
1316	+	*/
1317	+	public void testHasWaiters() throws InterruptedException {
1318	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1319	+	final Condition c = lock.writeLock().newCondition();
1320	+	final CountDownLatch locked = new CountDownLatch(1);
1321	+	Thread t = newStartedThread(new CheckedRunnable() {
1322	+	public void realRun() throws InterruptedException {
1323	+	lock.writeLock().lock();
1324	+	assertFalse(lock.hasWaiters(c));
1325	+	locked.countDown();
1326	+	assertEquals(0, lock.getWaitQueueLength(c));
1327	+	c.await();
1328	+	lock.writeLock().unlock();
1329	+	}});
1330	+
1331	+	locked.await();
1332	+	lock.writeLock().lock();
1333	+	assertTrue(lock.hasWaiters(c));
1334	+	assertEquals(1, lock.getWaitQueueLength(c));
1335	+	c.signal();
1336	+	assertHasNoWaiters(lock, c);
1337	+	lock.writeLock().unlock();
1338	+	awaitTermination(t);
1339	+	assertHasNoWaiters(lock, c);
1340	+	}
1341	+
1342	+	/**
1343	+	* getWaitQueueLength returns number of waiting threads
1344	+	*/
1345	+	public void testGetWaitQueueLength() throws InterruptedException {
1346	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1347	+	final Condition c = lock.writeLock().newCondition();
1348	+	final CountDownLatch locked = new CountDownLatch(1);
1349	+	Thread t = newStartedThread(new CheckedRunnable() {
1350	+	public void realRun() throws InterruptedException {
1351	+	lock.writeLock().lock();
1352	+	assertEquals(0, lock.getWaitQueueLength(c));
1353	+	locked.countDown();
1354	+	c.await();
1355	+	lock.writeLock().unlock();
1356	+	}});
1357	+
1358	+	locked.await();
1359	+	lock.writeLock().lock();
1360	+	assertHasWaiters(lock, c, t);
1361	+	assertEquals(1, lock.getWaitQueueLength(c));
1362	+	c.signal();
1363	+	assertHasNoWaiters(lock, c);
1364	+	assertEquals(0, lock.getWaitQueueLength(c));
1365	+	lock.writeLock().unlock();
1366	+	awaitTermination(t);
1367	+	}
1368	+
1369	+	/**
1370	+	* getWaitingThreads returns only and all waiting threads
1371	+	*/
1372	+	public void testGetWaitingThreads() throws InterruptedException {
1373	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1374	+	final Condition c = lock.writeLock().newCondition();
1375	+	final CountDownLatch locked1 = new CountDownLatch(1);
1376	+	final CountDownLatch locked2 = new CountDownLatch(1);
1377	+	Thread t1 = new Thread(new CheckedRunnable() {
1378	+	public void realRun() throws InterruptedException {
1379	+	lock.writeLock().lock();
1380	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1381	+	locked1.countDown();
1382	+	c.await();
1383	+	lock.writeLock().unlock();
1384	+	}});
1385	+
1386	+	Thread t2 = new Thread(new CheckedRunnable() {
1387	+	public void realRun() throws InterruptedException {
1388	+	lock.writeLock().lock();
1389	+	assertFalse(lock.getWaitingThreads(c).isEmpty());
1390	+	locked2.countDown();
1391	+	c.await();
1392	+	lock.writeLock().unlock();
1393	+	}});
1394	+
1395	+	lock.writeLock().lock();
1396	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1397	+	lock.writeLock().unlock();
1398	+
1399	+	t1.start();
1400	+	locked1.await();
1401	+	t2.start();
1402	+	locked2.await();
1403	+
1404	+	lock.writeLock().lock();
1405	+	assertTrue(lock.hasWaiters(c));
1406	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1407	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1408	+	assertEquals(2, lock.getWaitingThreads(c).size());
1409	+	c.signalAll();
1410	+	assertHasNoWaiters(lock, c);
1411	+	lock.writeLock().unlock();
1412	+
1413	+	awaitTermination(t1);
1414	+	awaitTermination(t2);
1415	+
1416	+	assertHasNoWaiters(lock, c);
1417	+	}
1418	+
1419	+	/**
1420	+	* toString indicates current lock state
1421	+	*/
1422	+	public void testToString() {
1423	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1424	+	String us = lock.toString();
1425	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1426	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1427	+	lock.writeLock().lock();
1428	+	String ws = lock.toString();
1429	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1430	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1431	+	lock.writeLock().unlock();
1432	+	lock.readLock().lock();
1433	+	lock.readLock().lock();
1434	+	String rs = lock.toString();
1435	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1436	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1437	+	}
1438	+
1439	+	/**
1440	+	* readLock.toString indicates current lock state
1441	+	*/
1442	+	public void testReadLockToString() {
1443	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1444	+	String us = lock.readLock().toString();
1445	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1446	+	lock.readLock().lock();
1447	+	lock.readLock().lock();
1448	+	String rs = lock.readLock().toString();
1449	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1450	+	}
1451	+
1452	+	/**
1453	+	* writeLock.toString indicates current lock state
1454	+	*/
1455	+	public void testWriteLockToString() {
1456	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1457	+	String us = lock.writeLock().toString();
1458	+	assertTrue(us.indexOf("Unlocked") >= 0);
1459	+	lock.writeLock().lock();
1460	+	String ls = lock.writeLock().toString();
1461	+	assertTrue(ls.indexOf("Locked") >= 0);
1462	+	}
1463
1464		}

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