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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 1.33 by jsr166, Tue Nov 17 14:33:55 2009 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
2	>	* Written by Doug Lea with assistance from members of JCP JSR-166
3	>	* Expert Group and released to the public domain, as explained at
4	>	* http://creativecommons.org/licenses/publicdomain
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9		import junit.framework.*;
10		import java.util.concurrent.locks.*;
11		import java.util.concurrent.*;
12		import java.io.*;
13	+	import java.util.*;
14
15	<	public class ReentrantReadWriteLockTest extends TestCase {
14	<	static int HOLD_COUNT_TEST_LIMIT = 20;
15	<
15	>	public class ReentrantReadWriteLockTest extends JSR166TestCase {
16		public static void main(String[] args) {
17	<	junit.textui.TestRunner.run (suite());
17	>	junit.textui.TestRunner.run (suite());
18		}
19	–
19		public static Test suite() {
20		return new TestSuite(ReentrantReadWriteLockTest.class);
21		}
22
23	+	/**
24	+	* A runnable calling lockInterruptibly
25	+	*/
26	+	class InterruptibleLockRunnable extends CheckedRunnable {
27	+	final ReentrantReadWriteLock lock;
28	+	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
29	+	public void realRun() throws InterruptedException {
30	+	lock.writeLock().lockInterruptibly();
31	+	}
32	+	}
33	+
34	+
35	+	/**
36	+	* A runnable calling lockInterruptibly that expects to be
37	+	* interrupted
38	+	*/
39	+	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
40	+	final ReentrantReadWriteLock lock;
41	+	InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
42	+	public void realRun() throws InterruptedException {
43	+	lock.writeLock().lockInterruptibly();
44	+	}
45	+	}
46	+
47	+	/**
48	+	* Subclass to expose protected methods
49	+	*/
50	+	static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
51	+	PublicReentrantReadWriteLock() { super(); }
52	+	public Collection<Thread> getQueuedThreads() {
53	+	return super.getQueuedThreads();
54	+	}
55	+	public Collection<Thread> getWaitingThreads(Condition c) {
56	+	return super.getWaitingThreads(c);
57	+	}
58	+	}
59	+
60	+	/**
61	+	* Constructor sets given fairness, and is in unlocked state
62	+	*/
63	+	public void testConstructor() {
64	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
65	+	assertFalse(rl.isFair());
66	+	assertFalse(rl.isWriteLocked());
67	+	assertEquals(0, rl.getReadLockCount());
68	+	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
69	+	assertTrue(r2.isFair());
70	+	assertFalse(r2.isWriteLocked());
71	+	assertEquals(0, r2.getReadLockCount());
72	+	ReentrantReadWriteLock r3 = new ReentrantReadWriteLock(false);
73	+	assertFalse(r3.isFair());
74	+	assertFalse(r3.isWriteLocked());
75	+	assertEquals(0, r3.getReadLockCount());
76	+	}
77	+
78	+	/**
79	+	* write-locking and read-locking an unlocked lock succeed
80	+	*/
81	+	public void testLock() {
82	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
83	+	rl.writeLock().lock();
84	+	assertTrue(rl.isWriteLocked());
85	+	assertTrue(rl.isWriteLockedByCurrentThread());
86	+	assertTrue(rl.writeLock().isHeldByCurrentThread());
87	+	assertEquals(0, rl.getReadLockCount());
88	+	rl.writeLock().unlock();
89	+	assertFalse(rl.isWriteLocked());
90	+	assertFalse(rl.isWriteLockedByCurrentThread());
91	+	assertFalse(rl.writeLock().isHeldByCurrentThread());
92	+	assertEquals(0, rl.getReadLockCount());
93	+	rl.readLock().lock();
94	+	assertFalse(rl.isWriteLocked());
95	+	assertFalse(rl.isWriteLockedByCurrentThread());
96	+	assertEquals(1, rl.getReadLockCount());
97	+	rl.readLock().unlock();
98	+	assertFalse(rl.isWriteLocked());
99	+	assertFalse(rl.isWriteLockedByCurrentThread());
100	+	assertEquals(0, rl.getReadLockCount());
101	+	}
102	+
103	+
104	+	/**
105	+	* locking an unlocked fair lock succeeds
106	+	*/
107	+	public void testFairLock() {
108	+	ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
109	+	rl.writeLock().lock();
110	+	assertTrue(rl.isWriteLocked());
111	+	assertTrue(rl.isWriteLockedByCurrentThread());
112	+	assertTrue(rl.writeLock().isHeldByCurrentThread());
113	+	assertEquals(0, rl.getReadLockCount());
114	+	rl.writeLock().unlock();
115	+	assertFalse(rl.isWriteLocked());
116	+	assertFalse(rl.isWriteLockedByCurrentThread());
117	+	assertFalse(rl.writeLock().isHeldByCurrentThread());
118	+	assertEquals(0, rl.getReadLockCount());
119	+	rl.readLock().lock();
120	+	assertFalse(rl.isWriteLocked());
121	+	assertFalse(rl.isWriteLockedByCurrentThread());
122	+	assertEquals(1, rl.getReadLockCount());
123	+	rl.readLock().unlock();
124	+	assertFalse(rl.isWriteLocked());
125	+	assertFalse(rl.isWriteLockedByCurrentThread());
126	+	assertEquals(0, rl.getReadLockCount());
127	+	}
128
129	<	private static long SHORT_DELAY_MS = 100;
130	<	private static long MEDIUM_DELAY_MS = 1000;
27	<	private static long LONG_DELAY_MS = 10000;
28	<
29	<	/*
30	<	* Unlocks an unlocked lock, throws Illegal Monitor State
31	<	*
129	>	/**
130	>	* getWriteHoldCount returns number of recursive holds
131		*/
132	<
133	<	public void testIllegalMonitorStateException(){
132	>	public void testGetWriteHoldCount() {
133	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
134	>	for (int i = 1; i <= SIZE; i++) {
135	>	lock.writeLock().lock();
136	>	assertEquals(i,lock.getWriteHoldCount());
137	>	}
138	>	for (int i = SIZE; i > 0; i--) {
139	>	lock.writeLock().unlock();
140	>	assertEquals(i-1,lock.getWriteHoldCount());
141	>	}
142	>	}
143	>
144	>	/**
145	>	* WriteLock.getHoldCount returns number of recursive holds
146	>	*/
147	>	public void testGetHoldCount() {
148	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
149	>	for (int i = 1; i <= SIZE; i++) {
150	>	lock.writeLock().lock();
151	>	assertEquals(i,lock.writeLock().getHoldCount());
152	>	}
153	>	for (int i = SIZE; i > 0; i--) {
154	>	lock.writeLock().unlock();
155	>	assertEquals(i-1,lock.writeLock().getHoldCount());
156	>	}
157	>	}
158	>
159	>	/**
160	>	* getReadHoldCount returns number of recursive holds
161	>	*/
162	>	public void testGetReadHoldCount() {
163	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
164	>	for (int i = 1; i <= SIZE; i++) {
165	>	lock.readLock().lock();
166	>	assertEquals(i,lock.getReadHoldCount());
167	>	}
168	>	for (int i = SIZE; i > 0; i--) {
169	>	lock.readLock().unlock();
170	>	assertEquals(i-1,lock.getReadHoldCount());
171	>	}
172	>	}
173	>
174	>
175	>	/**
176	>	* write-unlocking an unlocked lock throws IllegalMonitorStateException
177	>	*/
178	>	public void testUnlock_IllegalMonitorStateException() {
179		ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
180	<	try{
180	>	try {
181		rl.writeLock().unlock();
182	<	fail("Should of thown Illegal Monitor State Exception");
182	>	shouldThrow();
183	>	} catch (IllegalMonitorStateException success) {}
184	>	}
185	>
186
187	<	}catch(IllegalMonitorStateException success){}
187	>	/**
188	>	* write-lockInterruptibly is interruptible
189	>	*/
190	>	public void testWriteLockInterruptibly_Interrupted() throws Exception {
191	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
192	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
193	>	public void realRun() throws InterruptedException {
194	>	lock.writeLock().lockInterruptibly();
195	>	lock.writeLock().unlock();
196	>	lock.writeLock().lockInterruptibly();
197	>	lock.writeLock().unlock();
198	>	}});
199	>
200	>	lock.writeLock().lock();
201	>	t.start();
202	>	Thread.sleep(SHORT_DELAY_MS);
203	>	t.interrupt();
204	>	Thread.sleep(SHORT_DELAY_MS);
205	>	lock.writeLock().unlock();
206	>	t.join();
207		}
208
209	+	/**
210	+	* timed write-tryLock is interruptible
211	+	*/
212	+	public void testWriteTryLock_Interrupted() throws InterruptedException {
213	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
214	+	lock.writeLock().lock();
215	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
216	+	public void realRun() throws InterruptedException {
217	+	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
218	+	}});
219	+
220	+	t.start();
221	+	t.interrupt();
222	+	lock.writeLock().unlock();
223	+	t.join();
224	+	}
225
226	+	/**
227	+	* read-lockInterruptibly is interruptible
228	+	*/
229	+	public void testReadLockInterruptibly_Interrupted() throws InterruptedException {
230	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
231	+	lock.writeLock().lock();
232	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
233	+	public void realRun() throws InterruptedException {
234	+	lock.readLock().lockInterruptibly();
235	+	}});
236	+
237	+	t.start();
238	+	Thread.sleep(SHORT_DELAY_MS);
239	+	t.interrupt();
240	+	Thread.sleep(SHORT_DELAY_MS);
241	+	lock.writeLock().unlock();
242	+	t.join();
243	+	}
244
245	<	public void testInterruptedException(){
245	>	/**
246	>	* timed read-tryLock is interruptible
247	>	*/
248	>	public void testReadTryLock_Interrupted() throws InterruptedException {
249		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
250		lock.writeLock().lock();
251	<	Thread t = new Thread(new Runnable() {
252	<	public void run(){
253	<	try{
254	<	lock.writeLock().lockInterruptibly();
255	<	fail("should throw");
256	<	}catch(InterruptedException success){}
257	<	}
258	<	});
259	<	try {
57	<	t.start();
58	<	t.interrupt();
59	<	lock.writeLock().unlock();
60	<	t.join();
61	<	} catch(Exception e){
62	<	fail("unexpected exception");
63	<	}
64	<	}
251	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
252	>	public void realRun() throws InterruptedException {
253	>	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
254	>	}});
255	>
256	>	t.start();
257	>	t.interrupt();
258	>	t.join();
259	>	}
260
261	<	public void testInterruptedException2(){
261	>
262	>	/**
263	>	* write-tryLock fails if locked
264	>	*/
265	>	public void testWriteTryLockWhenLocked() throws InterruptedException {
266		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
267		lock.writeLock().lock();
268		Thread t = new Thread(new Runnable() {
269	<	public void run(){
270	<	try{
72	<	lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
73	<	fail("should throw");
74	<	}catch(InterruptedException success){}
269	>	public void run() {
270	>	threadAssertFalse(lock.writeLock().tryLock());
271		}
272		});
273	<	try {
274	<	t.start();
275	<	t.interrupt();
276	<	lock.writeLock().unlock();
81	<	t.join();
82	<	} catch(Exception e){
83	<	fail("unexpected exception");
84	<	}
273	>
274	>	t.start();
275	>	t.join();
276	>	lock.writeLock().unlock();
277		}
278
279	<	public void testInterruptedException3(){
279	>	/**
280	>	* read-tryLock fails if locked
281	>	*/
282	>	public void testReadTryLockWhenLocked() throws InterruptedException {
283		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
284		lock.writeLock().lock();
285		Thread t = new Thread(new Runnable() {
286	<	public void run(){
287	<	try{
93	<	lock.readLock().lockInterruptibly();
94	<	fail("should throw");
95	<	}catch(InterruptedException success){}
286	>	public void run() {
287	>	threadAssertFalse(lock.readLock().tryLock());
288		}
289		});
98	–	try {
99	–	t.start();
100	–	t.interrupt();
101	–	lock.writeLock().unlock();
102	–	t.join();
103	–	} catch(Exception e){
104	–	fail("unexpected exception");
105	–	}
106	–	}
290
291	<	public void testInterruptedException4(){
291	>	t.start();
292	>	t.join();
293	>	lock.writeLock().unlock();
294	>	}
295	>
296	>	/**
297	>	* Multiple threads can hold a read lock when not write-locked
298	>	*/
299	>	public void testMultipleReadLocks() throws InterruptedException {
300		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
301	<	lock.writeLock().lock();
301	>	lock.readLock().lock();
302		Thread t = new Thread(new Runnable() {
303	<	public void run(){
304	<	try{
305	<	lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS);
115	<	fail("should throw");
116	<	}catch(InterruptedException success){}
303	>	public void run() {
304	>	threadAssertTrue(lock.readLock().tryLock());
305	>	lock.readLock().unlock();
306		}
307		});
308	<	try {
309	<	t.start();
310	<	t.interrupt();
311	<	t.join();
123	<	} catch(Exception e){
124	<	fail("unexpected exception");
125	<	}
308	>
309	>	t.start();
310	>	t.join();
311	>	lock.readLock().unlock();
312		}
313
314	<
315	<	public void testTryLockWhenLocked() {
314	>	/**
315	>	* A writelock succeeds after reading threads unlock
316	>	*/
317	>	public void testWriteAfterMultipleReadLocks() throws InterruptedException {
318		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
319	<	lock.writeLock().lock();
320	<	Thread t = new Thread(new Runnable() {
321	<	public void run(){
322	<	assertFalse(lock.writeLock().tryLock());
319	>	lock.readLock().lock();
320	>	Thread t1 = new Thread(new Runnable() {
321	>	public void run() {
322	>	lock.readLock().lock();
323	>	lock.readLock().unlock();
324	>	}
325	>	});
326	>	Thread t2 = new Thread(new Runnable() {
327	>	public void run() {
328	>	lock.writeLock().lock();
329	>	lock.writeLock().unlock();
330		}
331		});
137	–	try {
138	–	t.start();
139	–	t.join();
140	–	lock.writeLock().unlock();
141	–	} catch(Exception e){
142	–	fail("unexpected exception");
143	–	}
144	–	}
332
333	<	public void testTryLockWhenLocked2() {
333	>	t1.start();
334	>	t2.start();
335	>	Thread.sleep(SHORT_DELAY_MS);
336	>	lock.readLock().unlock();
337	>	t1.join(MEDIUM_DELAY_MS);
338	>	t2.join(MEDIUM_DELAY_MS);
339	>	assertTrue(!t1.isAlive());
340	>	assertTrue(!t2.isAlive());
341	>	}
342	>
343	>	/**
344	>	* Readlocks succeed after a writing thread unlocks
345	>	*/
346	>	public void testReadAfterWriteLock() throws InterruptedException {
347		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
348		lock.writeLock().lock();
349	<	Thread t = new Thread(new Runnable() {
350	<	public void run(){
351	<	assertFalse(lock.readLock().tryLock());
349	>	Thread t1 = new Thread(new Runnable() {
350	>	public void run() {
351	>	lock.readLock().lock();
352	>	lock.readLock().unlock();
353		}
354		});
355	<	try {
356	<	t.start();
357	<	t.join();
157	<	lock.writeLock().unlock();
158	<	} catch(Exception e){
159	<	fail("unexpected exception");
160	<	}
161	<	}
162	<
163	<	public void testMultipleReadLocks() {
164	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
165	<	lock.readLock().lock();
166	<	Thread t = new Thread(new Runnable() {
167	<	public void run(){
168	<	assertTrue(lock.readLock().tryLock());
355	>	Thread t2 = new Thread(new Runnable() {
356	>	public void run() {
357	>	lock.readLock().lock();
358		lock.readLock().unlock();
359		}
360		});
172	–	try {
173	–	t.start();
174	–	t.join();
175	–	lock.readLock().unlock();
176	–	} catch(Exception e){
177	–	fail("unexpected exception");
178	–	}
179	–	}
361
362	<	public void testWriteAfterMultipleReadLocks() {
362	>	t1.start();
363	>	t2.start();
364	>	Thread.sleep(SHORT_DELAY_MS);
365	>	lock.writeLock().unlock();
366	>	t1.join(MEDIUM_DELAY_MS);
367	>	t2.join(MEDIUM_DELAY_MS);
368	>	assertTrue(!t1.isAlive());
369	>	assertTrue(!t2.isAlive());
370	>	}
371	>
372	>	/**
373	>	* Read trylock succeeds if write locked by current thread
374	>	*/
375	>	public void testReadHoldingWriteLock() {
376		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
377	<	lock.readLock().lock();
377	>	lock.writeLock().lock();
378	>	assertTrue(lock.readLock().tryLock());
379	>	lock.readLock().unlock();
380	>	lock.writeLock().unlock();
381	>	}
382	>
383	>	/**
384	>	* Read lock succeeds if write locked by current thread even if
385	>	* other threads are waiting for readlock
386	>	*/
387	>	public void testReadHoldingWriteLock2() throws InterruptedException {
388	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
389	>	lock.writeLock().lock();
390		Thread t1 = new Thread(new Runnable() {
391	<	public void run(){
391	>	public void run() {
392		lock.readLock().lock();
393		lock.readLock().unlock();
394		}
395		});
396		Thread t2 = new Thread(new Runnable() {
397	<	public void run(){
397	>	public void run() {
398	>	lock.readLock().lock();
399	>	lock.readLock().unlock();
400	>	}
401	>	});
402	>
403	>	t1.start();
404	>	t2.start();
405	>	lock.readLock().lock();
406	>	lock.readLock().unlock();
407	>	Thread.sleep(SHORT_DELAY_MS);
408	>	lock.readLock().lock();
409	>	lock.readLock().unlock();
410	>	lock.writeLock().unlock();
411	>	t1.join(MEDIUM_DELAY_MS);
412	>	t2.join(MEDIUM_DELAY_MS);
413	>	assertTrue(!t1.isAlive());
414	>	assertTrue(!t2.isAlive());
415	>	}
416	>
417	>	/**
418	>	*  Read lock succeeds if write locked by current thread even if
419	>	* other threads are waiting for writelock
420	>	*/
421	>	public void testReadHoldingWriteLock3() throws InterruptedException {
422	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
423	>	lock.writeLock().lock();
424	>	Thread t1 = new Thread(new Runnable() {
425	>	public void run() {
426	>	lock.writeLock().lock();
427	>	lock.writeLock().unlock();
428	>	}
429	>	});
430	>	Thread t2 = new Thread(new Runnable() {
431	>	public void run() {
432		lock.writeLock().lock();
433		lock.writeLock().unlock();
434		}
435		});
436
437	<	try {
438	<	t1.start();
439	<	t2.start();
440	<	Thread.sleep(SHORT_DELAY_MS);
441	<	lock.readLock().unlock();
442	<	t1.join(MEDIUM_DELAY_MS);
443	<	t2.join(MEDIUM_DELAY_MS);
444	<	assertTrue(!t1.isAlive());
445	<	assertTrue(!t2.isAlive());
446	<
447	<	} catch(Exception e){
448	<	fail("unexpected exception");
449	<	}
210	<	}
437	>	t1.start();
438	>	t2.start();
439	>	lock.readLock().lock();
440	>	lock.readLock().unlock();
441	>	Thread.sleep(SHORT_DELAY_MS);
442	>	lock.readLock().lock();
443	>	lock.readLock().unlock();
444	>	lock.writeLock().unlock();
445	>	t1.join(MEDIUM_DELAY_MS);
446	>	t2.join(MEDIUM_DELAY_MS);
447	>	assertTrue(!t1.isAlive());
448	>	assertTrue(!t2.isAlive());
449	>	}
450
451	<	public void testReadAfterWriteLock() {
451	>
452	>	/**
453	>	*  Write lock succeeds if write locked by current thread even if
454	>	* other threads are waiting for writelock
455	>	*/
456	>	public void testWriteHoldingWriteLock4() throws InterruptedException {
457		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
458		lock.writeLock().lock();
459		Thread t1 = new Thread(new Runnable() {
460	<	public void run(){
460	>	public void run() {
461	>	lock.writeLock().lock();
462	>	lock.writeLock().unlock();
463	>	}
464	>	});
465	>	Thread t2 = new Thread(new Runnable() {
466	>	public void run() {
467	>	lock.writeLock().lock();
468	>	lock.writeLock().unlock();
469	>	}
470	>	});
471	>
472	>	t1.start();
473	>	t2.start();
474	>	lock.writeLock().lock();
475	>	lock.writeLock().unlock();
476	>	Thread.sleep(SHORT_DELAY_MS);
477	>	lock.writeLock().lock();
478	>	lock.writeLock().unlock();
479	>	lock.writeLock().unlock();
480	>	t1.join(MEDIUM_DELAY_MS);
481	>	t2.join(MEDIUM_DELAY_MS);
482	>	assertTrue(!t1.isAlive());
483	>	assertTrue(!t2.isAlive());
484	>	}
485	>
486	>
487	>	/**
488	>	* Fair Read trylock succeeds if write locked by current thread
489	>	*/
490	>	public void testReadHoldingWriteLockFair() {
491	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
492	>	lock.writeLock().lock();
493	>	assertTrue(lock.readLock().tryLock());
494	>	lock.readLock().unlock();
495	>	lock.writeLock().unlock();
496	>	}
497	>
498	>	/**
499	>	* Fair Read lock succeeds if write locked by current thread even if
500	>	* other threads are waiting for readlock
501	>	*/
502	>	public void testReadHoldingWriteLockFair2() throws InterruptedException {
503	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
504	>	lock.writeLock().lock();
505	>	Thread t1 = new Thread(new Runnable() {
506	>	public void run() {
507		lock.readLock().lock();
508		lock.readLock().unlock();
509		}
510		});
511		Thread t2 = new Thread(new Runnable() {
512	<	public void run(){
512	>	public void run() {
513		lock.readLock().lock();
514		lock.readLock().unlock();
515		}
516		});
517
518	<	try {
519	<	t1.start();
520	<	t2.start();
521	<	Thread.sleep(SHORT_DELAY_MS);
522	<	lock.writeLock().unlock();
523	<	t1.join(MEDIUM_DELAY_MS);
524	<	t2.join(MEDIUM_DELAY_MS);
525	<	assertTrue(!t1.isAlive());
526	<	assertTrue(!t2.isAlive());
527	<
528	<	} catch(Exception e){
529	<	fail("unexpected exception");
530	<	}
241	<	}
518	>	t1.start();
519	>	t2.start();
520	>	lock.readLock().lock();
521	>	lock.readLock().unlock();
522	>	Thread.sleep(SHORT_DELAY_MS);
523	>	lock.readLock().lock();
524	>	lock.readLock().unlock();
525	>	lock.writeLock().unlock();
526	>	t1.join(MEDIUM_DELAY_MS);
527	>	t2.join(MEDIUM_DELAY_MS);
528	>	assertTrue(!t1.isAlive());
529	>	assertTrue(!t2.isAlive());
530	>	}
531
532
533	<	public void testTryLockWhenReadLocked() {
533	>	/**
534	>	* Fair Read lock succeeds if write locked by current thread even if
535	>	* other threads are waiting for writelock
536	>	*/
537	>	public void testReadHoldingWriteLockFair3() throws InterruptedException {
538	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
539	>	lock.writeLock().lock();
540	>	Thread t1 = new Thread(new Runnable() {
541	>	public void run() {
542	>	lock.writeLock().lock();
543	>	lock.writeLock().unlock();
544	>	}
545	>	});
546	>	Thread t2 = new Thread(new Runnable() {
547	>	public void run() {
548	>	lock.writeLock().lock();
549	>	lock.writeLock().unlock();
550	>	}
551	>	});
552	>
553	>	t1.start();
554	>	t2.start();
555	>	lock.readLock().lock();
556	>	lock.readLock().unlock();
557	>	Thread.sleep(SHORT_DELAY_MS);
558	>	lock.readLock().lock();
559	>	lock.readLock().unlock();
560	>	lock.writeLock().unlock();
561	>	t1.join(MEDIUM_DELAY_MS);
562	>	t2.join(MEDIUM_DELAY_MS);
563	>	assertTrue(!t1.isAlive());
564	>	assertTrue(!t2.isAlive());
565	>	}
566	>
567	>
568	>	/**
569	>	* Fair Write lock succeeds if write locked by current thread even if
570	>	* other threads are waiting for writelock
571	>	*/
572	>	public void testWriteHoldingWriteLockFair4() throws InterruptedException {
573	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
574	>	lock.writeLock().lock();
575	>	Thread t1 = new Thread(new Runnable() {
576	>	public void run() {
577	>	lock.writeLock().lock();
578	>	lock.writeLock().unlock();
579	>	}
580	>	});
581	>	Thread t2 = new Thread(new Runnable() {
582	>	public void run() {
583	>	lock.writeLock().lock();
584	>	lock.writeLock().unlock();
585	>	}
586	>	});
587	>
588	>	t1.start();
589	>	t2.start();
590	>	Thread.sleep(SHORT_DELAY_MS);
591	>	assertTrue(lock.isWriteLockedByCurrentThread());
592	>	assertTrue(lock.getWriteHoldCount() == 1);
593	>	lock.writeLock().lock();
594	>	assertTrue(lock.getWriteHoldCount() == 2);
595	>	lock.writeLock().unlock();
596	>	lock.writeLock().lock();
597	>	lock.writeLock().unlock();
598	>	lock.writeLock().unlock();
599	>	t1.join(MEDIUM_DELAY_MS);
600	>	t2.join(MEDIUM_DELAY_MS);
601	>	assertTrue(!t1.isAlive());
602	>	assertTrue(!t2.isAlive());
603	>	}
604	>
605	>
606	>	/**
607	>	* Read tryLock succeeds if readlocked but not writelocked
608	>	*/
609	>	public void testTryLockWhenReadLocked() throws InterruptedException {
610		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
611		lock.readLock().lock();
612		Thread t = new Thread(new Runnable() {
613	<	public void run(){
614	<	assertTrue(lock.readLock().tryLock());
613	>	public void run() {
614	>	threadAssertTrue(lock.readLock().tryLock());
615		lock.readLock().unlock();
616		}
617		});
253	–	try {
254	–	t.start();
255	–	t.join();
256	–	lock.readLock().unlock();
257	–	} catch(Exception e){
258	–	fail("unexpected exception");
259	–	}
260	–	}
618
619	<
619	>	t.start();
620	>	t.join();
621	>	lock.readLock().unlock();
622	>	}
623	>
624
625	<	public void testWriteTryLockWhenReadLocked() {
625	>
626	>	/**
627	>	* write tryLock fails when readlocked
628	>	*/
629	>	public void testWriteTryLockWhenReadLocked() throws InterruptedException {
630		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
631		lock.readLock().lock();
632		Thread t = new Thread(new Runnable() {
633	<	public void run(){
634	<	assertFalse(lock.writeLock().tryLock());
633	>	public void run() {
634	>	threadAssertFalse(lock.writeLock().tryLock());
635		}
636		});
272	–	try {
273	–	t.start();
274	–	t.join();
275	–	lock.readLock().unlock();
276	–	} catch(Exception e){
277	–	fail("unexpected exception");
278	–	}
279	–	}
637
638	<
638	>	t.start();
639	>	t.join();
640	>	lock.readLock().unlock();
641	>	}
642
643	<	public void testTryLock_Timeout(){
644	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
645	<	lock.writeLock().lock();
643	>
644	>	/**
645	>	* Fair Read tryLock succeeds if readlocked but not writelocked
646	>	*/
647	>	public void testTryLockWhenReadLockedFair() throws InterruptedException {
648	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
649	>	lock.readLock().lock();
650		Thread t = new Thread(new Runnable() {
651	<	public void run(){
652	<	try {
653	<	assertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
290	<	} catch (Exception ex) {
291	<	fail("unexpected exception");
292	<	}
651	>	public void run() {
652	>	threadAssertTrue(lock.readLock().tryLock());
653	>	lock.readLock().unlock();
654		}
655		});
295	–	try {
296	–	t.start();
297	–	t.join();
298	–	lock.writeLock().unlock();
299	–	} catch(Exception e){
300	–	fail("unexpected exception");
301	–	}
302	–	}
656
657	<	public void testTryLock_Timeout2(){
658	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
659	<	lock.writeLock().lock();
657	>	t.start();
658	>	t.join();
659	>	lock.readLock().unlock();
660	>	}
661	>
662	>
663	>
664	>	/**
665	>	* Fair write tryLock fails when readlocked
666	>	*/
667	>	public void testWriteTryLockWhenReadLockedFair() throws InterruptedException {
668	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
669	>	lock.readLock().lock();
670		Thread t = new Thread(new Runnable() {
671	<	public void run(){
672	<	try {
310	<	assertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
311	<	} catch (Exception ex) {
312	<	fail("unexpected exception");
313	<	}
671	>	public void run() {
672	>	threadAssertFalse(lock.writeLock().tryLock());
673		}
674		});
675	<	try {
676	<	t.start();
677	<	t.join();
678	<	lock.writeLock().unlock();
679	<	} catch(Exception e){
321	<	fail("unexpected exception");
322	<	}
323	<	}
675	>
676	>	t.start();
677	>	t.join();
678	>	lock.readLock().unlock();
679	>	}
680
681
682	<	public void testLockInterruptibly() {
682	>
683	>	/**
684	>	* write timed tryLock times out if locked
685	>	*/
686	>	public void testWriteTryLock_Timeout() throws InterruptedException {
687		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
688	<	try {
689	<	lock.writeLock().lockInterruptibly();
690	<	} catch(Exception e) {
691	<	fail("unexpected exception");
692	<	}
693	<	Thread t = new Thread(new Runnable() {
694	<	public void run() {
695	<	try {
696	<	lock.writeLock().lockInterruptibly();
337	<	fail("should throw");
338	<	}
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	<	}
688	>	lock.writeLock().lock();
689	>	Thread t = new Thread(new CheckedRunnable() {
690	>	public void realRun() throws InterruptedException {
691	>	threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS));
692	>	}});
693	>
694	>	t.start();
695	>	t.join();
696	>	lock.writeLock().unlock();
697		}
698
699	<	public void testLockInterruptibly2() {
699	>	/**
700	>	* read timed tryLock times out if write-locked
701	>	*/
702	>	public void testReadTryLock_Timeout() throws InterruptedException {
703		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
704	<	try {
705	<	lock.writeLock().lockInterruptibly();
706	<	} catch(Exception e) {
707	<	fail("unexpected exception");
708	<	}
709	<	Thread t = new Thread(new Runnable() {
710	<	public void run() {
711	<	try {
712	<	lock.readLock().lockInterruptibly();
364	<	fail("should throw");
365	<	}
366	<	catch(InterruptedException success) {
367	<	}
368	<	}
369	<	});
370	<	try {
371	<	t.start();
372	<	t.interrupt();
373	<	t.join();
374	<	lock.writeLock().unlock();
375	<	} catch(Exception e){
376	<	fail("unexpected exception");
377	<	}
704	>	lock.writeLock().lock();
705	>	Thread t = new Thread(new CheckedRunnable() {
706	>	public void realRun() throws InterruptedException {
707	>	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
708	>	}});
709	>
710	>	t.start();
711	>	t.join();
712	>	lock.writeLock().unlock();
713		}
714
715	<	public void testAwait_IllegalMonitor() {
716	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
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 = new Thread(new CheckedInterruptedRunnable() {
723	>	public void realRun() throws InterruptedException {
724	>	lock.writeLock().lockInterruptibly();
725	>	}});
726	>
727	>	t.start();
728	>	Thread.sleep(SHORT_DELAY_MS);
729	>	t.interrupt();
730	>	Thread.sleep(SHORT_DELAY_MS);
731	>	t.join();
732	>	lock.writeLock().unlock();
733	>	}
734	>
735	>	/**
736	>	*  read lockInterruptibly succeeds if lock free else is interruptible
737	>	*/
738	>	public void testReadLockInterruptibly() throws InterruptedException {
739	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
740	>	lock.writeLock().lockInterruptibly();
741	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
742	>	public void realRun() throws InterruptedException {
743	>	lock.readLock().lockInterruptibly();
744	>	}});
745	>
746	>	t.start();
747	>	Thread.sleep(SHORT_DELAY_MS);
748	>	t.interrupt();
749	>	t.join();
750	>	lock.writeLock().unlock();
751	>	}
752	>
753	>	/**
754	>	* Calling await without holding lock throws IllegalMonitorStateException
755	>	*/
756	>	public void testAwait_IllegalMonitor() throws InterruptedException {
757	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
758		final Condition c = lock.writeLock().newCondition();
759		try {
760		c.await();
761	<	fail("should throw");
762	<	}
387	<	catch (IllegalMonitorStateException success) {
388	<	}
389	<	catch (Exception ex) {
390	<	fail("should throw IMSE");
391	<	}
761	>	shouldThrow();
762	>	} catch (IllegalMonitorStateException success) {}
763		}
764
765	+	/**
766	+	* Calling signal without holding lock throws IllegalMonitorStateException
767	+	*/
768		public void testSignal_IllegalMonitor() {
769	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
769	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
770		final Condition c = lock.writeLock().newCondition();
771		try {
772		c.signal();
773	<	fail("should throw");
774	<	}
401	<	catch (IllegalMonitorStateException success) {
402	<	}
403	<	catch (Exception ex) {
404	<	fail("should throw IMSE");
405	<	}
773	>	shouldThrow();
774	>	} catch (IllegalMonitorStateException success) {}
775		}
776
777	<	public void testAwaitNanos_Timeout() {
778	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
777	>	/**
778	>	* awaitNanos without a signal times out
779	>	*/
780	>	public void testAwaitNanos_Timeout() throws InterruptedException {
781	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
782		final Condition c = lock.writeLock().newCondition();
783	<	try {
784	<	lock.writeLock().lock();
785	<	long t = c.awaitNanos(100);
786	<	assertTrue(t <= 0);
787	<	lock.writeLock().unlock();
416	<	}
417	<	catch (Exception ex) {
418	<	fail("unexpected exception");
419	<	}
783	>
784	>	lock.writeLock().lock();
785	>	long t = c.awaitNanos(100);
786	>	assertTrue(t <= 0);
787	>	lock.writeLock().unlock();
788		}
789
790	+
791	+	/**
792	+	*  timed await without a signal times out
793	+	*/
794		public void testAwait_Timeout() {
795	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
795	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
796		final Condition c = lock.writeLock().newCondition();
797	<	try {
798	<	lock.writeLock().lock();
427	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
428	<	lock.writeLock().unlock();
429	<	}
430	<	catch (Exception ex) {
431	<	fail("unexpected exception");
432	<	}
797	>	lock.writeLock().lock();
798	>	lock.writeLock().unlock();
799		}
800
801	+	/**
802	+	* awaitUntil without a signal times out
803	+	*/
804		public void testAwaitUntil_Timeout() {
805	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
805	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
806		final Condition c = lock.writeLock().newCondition();
807	<	try {
808	<	lock.writeLock().lock();
809	<	java.util.Date d = new java.util.Date();
810	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
811	<	lock.writeLock().unlock();
812	<	}
813	<	catch (Exception ex) {
814	<	fail("unexpected exception");
807	>	lock.writeLock().lock();
808	>	java.util.Date d = new java.util.Date();
809	>	lock.writeLock().unlock();
810	>	}
811	>
812	>	/**
813	>	* await returns when signalled
814	>	*/
815	>	public void testAwait() throws InterruptedException {
816	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
817	>	final Condition c = lock.writeLock().newCondition();
818	>	Thread t = new Thread(new CheckedRunnable() {
819	>	public void realRun() throws InterruptedException {
820	>	lock.writeLock().lock();
821	>	c.await();
822	>	lock.writeLock().unlock();
823	>	}});
824	>
825	>	t.start();
826	>	Thread.sleep(SHORT_DELAY_MS);
827	>	lock.writeLock().lock();
828	>	c.signal();
829	>	lock.writeLock().unlock();
830	>	t.join(SHORT_DELAY_MS);
831	>	assertFalse(t.isAlive());
832	>	}
833	>
834	>	/** A helper class for uninterruptible wait tests */
835	>	class UninterruptableThread extends Thread {
836	>	private Lock lock;
837	>	private Condition c;
838	>
839	>	public volatile boolean canAwake = false;
840	>	public volatile boolean interrupted = false;
841	>	public volatile boolean lockStarted = false;
842	>
843	>	public UninterruptableThread(Lock lock, Condition c) {
844	>	this.lock = lock;
845	>	this.c = c;
846	>	}
847	>
848	>	public synchronized void run() {
849	>	lock.lock();
850	>	lockStarted = true;
851	>
852	>	while (!canAwake) {
853	>	c.awaitUninterruptibly();
854	>	}
855	>
856	>	interrupted = isInterrupted();
857	>	lock.unlock();
858		}
859		}
860
861	<	public void testAwait() {
862	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
861	>	/**
862	>	* awaitUninterruptibly doesn't abort on interrupt
863	>	*/
864	>	public void testAwaitUninterruptibly() throws InterruptedException {
865	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
866		final Condition c = lock.writeLock().newCondition();
867	<	Thread t = new Thread(new Runnable() {
868	<	public void run() {
869	<	try {
455	<	lock.writeLock().lock();
456	<	c.await();
457	<	lock.writeLock().unlock();
458	<	}
459	<	catch(InterruptedException e) {
460	<	fail("unexpected exception");
461	<	}
462	<	}
463	<	});
867	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
868	>
869	>	thread.start();
870
871	+	while (!thread.lockStarted) {
872	+	Thread.sleep(100);
873	+	}
874	+
875	+	lock.writeLock().lock();
876		try {
877	<	t.start();
878	<	Thread.sleep(SHORT_DELAY_MS);
468	<	lock.writeLock().lock();
877	>	thread.interrupt();
878	>	thread.canAwake = true;
879		c.signal();
880	+	} finally {
881		lock.writeLock().unlock();
471	–	t.join(SHORT_DELAY_MS);
472	–	assertFalse(t.isAlive());
473	–	}
474	–	catch (Exception ex) {
475	–	fail("unexpected exception");
882		}
883	+
884	+	thread.join();
885	+	assertTrue(thread.interrupted);
886	+	assertFalse(thread.isAlive());
887		}
888
889	<	public void testAwaitUninterruptibly() {
890	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
889	>	/**
890	>	* await is interruptible
891	>	*/
892	>	public void testAwait_Interrupt() throws InterruptedException {
893	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
894		final Condition c = lock.writeLock().newCondition();
895	<	Thread t = new Thread(new Runnable() {
896	<	public void run() {
897	<	lock.writeLock().lock();
898	<	c.awaitUninterruptibly();
899	<	lock.writeLock().unlock();
900	<	}
901	<	});
895	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
896	>	public void realRun() throws InterruptedException {
897	>	lock.writeLock().lock();
898	>	c.await();
899	>	lock.writeLock().unlock();
900	>	}});
901	>
902	>	t.start();
903	>	Thread.sleep(SHORT_DELAY_MS);
904	>	t.interrupt();
905	>	t.join(SHORT_DELAY_MS);
906	>	assertFalse(t.isAlive());
907	>	}
908
909	+	/**
910	+	* awaitNanos is interruptible
911	+	*/
912	+	public void testAwaitNanos_Interrupt() throws InterruptedException {
913	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
914	+	final Condition c = lock.writeLock().newCondition();
915	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
916	+	public void realRun() throws InterruptedException {
917	+	lock.writeLock().lock();
918	+	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
919	+	lock.writeLock().unlock();
920	+	}});
921	+
922	+	t.start();
923	+	Thread.sleep(SHORT_DELAY_MS);
924	+	t.interrupt();
925	+	t.join(SHORT_DELAY_MS);
926	+	assertFalse(t.isAlive());
927	+	}
928	+
929	+	/**
930	+	* awaitUntil is interruptible
931	+	*/
932	+	public void testAwaitUntil_Interrupt() throws InterruptedException {
933	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
934	+	final Condition c = lock.writeLock().newCondition();
935	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
936	+	public void realRun() throws InterruptedException {
937	+	lock.writeLock().lock();
938	+	java.util.Date d = new java.util.Date();
939	+	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
940	+	lock.writeLock().unlock();
941	+	}});
942	+
943	+	t.start();
944	+	Thread.sleep(SHORT_DELAY_MS);
945	+	t.interrupt();
946	+	t.join(SHORT_DELAY_MS);
947	+	assertFalse(t.isAlive());
948	+	}
949	+
950	+	/**
951	+	* signalAll wakes up all threads
952	+	*/
953	+	public void testSignalAll() throws InterruptedException {
954	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
955	+	final Condition c = lock.writeLock().newCondition();
956	+	Thread t1 = new Thread(new CheckedRunnable() {
957	+	public void realRun() throws InterruptedException {
958	+	lock.writeLock().lock();
959	+	c.await();
960	+	lock.writeLock().unlock();
961	+	}});
962	+
963	+	Thread t2 = new Thread(new CheckedRunnable() {
964	+	public void realRun() throws InterruptedException {
965	+	lock.writeLock().lock();
966	+	c.await();
967	+	lock.writeLock().unlock();
968	+	}});
969	+
970	+	t1.start();
971	+	t2.start();
972	+	Thread.sleep(SHORT_DELAY_MS);
973	+	lock.writeLock().lock();
974	+	c.signalAll();
975	+	lock.writeLock().unlock();
976	+	t1.join(SHORT_DELAY_MS);
977	+	t2.join(SHORT_DELAY_MS);
978	+	assertFalse(t1.isAlive());
979	+	assertFalse(t2.isAlive());
980	+	}
981	+
982	+	/**
983	+	* A serialized lock deserializes as unlocked
984	+	*/
985	+	public void testSerialization() throws Exception {
986	+	ReentrantReadWriteLock l = new ReentrantReadWriteLock();
987	+	l.readLock().lock();
988	+	l.readLock().unlock();
989	+
990	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
991	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
992	+	out.writeObject(l);
993	+	out.close();
994	+
995	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
996	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
997	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
998	+	r.readLock().lock();
999	+	r.readLock().unlock();
1000	+	}
1001	+
1002	+	/**
1003	+	* hasQueuedThreads reports whether there are waiting threads
1004	+	*/
1005	+	public void testhasQueuedThreads() throws InterruptedException {
1006	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1007	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1008	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1009	+	assertFalse(lock.hasQueuedThreads());
1010	+	lock.writeLock().lock();
1011	+	t1.start();
1012	+	Thread.sleep(SHORT_DELAY_MS);
1013	+	assertTrue(lock.hasQueuedThreads());
1014	+	t2.start();
1015	+	Thread.sleep(SHORT_DELAY_MS);
1016	+	assertTrue(lock.hasQueuedThreads());
1017	+	t1.interrupt();
1018	+	Thread.sleep(SHORT_DELAY_MS);
1019	+	assertTrue(lock.hasQueuedThreads());
1020	+	lock.writeLock().unlock();
1021	+	Thread.sleep(SHORT_DELAY_MS);
1022	+	assertFalse(lock.hasQueuedThreads());
1023	+	t1.join();
1024	+	t2.join();
1025	+	}
1026	+
1027	+	/**
1028	+	* hasQueuedThread(null) throws NPE
1029	+	*/
1030	+	public void testHasQueuedThreadNPE() {
1031	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1032		try {
1033	<	t.start();
1034	<	Thread.sleep(SHORT_DELAY_MS);
1035	<	t.interrupt();
1036	<	lock.writeLock().lock();
1037	<	c.signal();
1038	<	lock.writeLock().unlock();
1039	<	t.join(SHORT_DELAY_MS);
1040	<	assertFalse(t.isAlive());
1041	<	}
1042	<	catch (Exception ex) {
1043	<	fail("unexpected exception");
1044	<	}
1033	>	sync.hasQueuedThread(null);
1034	>	shouldThrow();
1035	>	} catch (NullPointerException success) {}
1036	>	}
1037	>
1038	>	/**
1039	>	* hasQueuedThread reports whether a thread is queued.
1040	>	*/
1041	>	public void testHasQueuedThread() throws InterruptedException {
1042	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1043	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1044	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1045	>	assertFalse(sync.hasQueuedThread(t1));
1046	>	assertFalse(sync.hasQueuedThread(t2));
1047	>	sync.writeLock().lock();
1048	>	t1.start();
1049	>	Thread.sleep(SHORT_DELAY_MS);
1050	>	assertTrue(sync.hasQueuedThread(t1));
1051	>	t2.start();
1052	>	Thread.sleep(SHORT_DELAY_MS);
1053	>	assertTrue(sync.hasQueuedThread(t1));
1054	>	assertTrue(sync.hasQueuedThread(t2));
1055	>	t1.interrupt();
1056	>	Thread.sleep(SHORT_DELAY_MS);
1057	>	assertFalse(sync.hasQueuedThread(t1));
1058	>	assertTrue(sync.hasQueuedThread(t2));
1059	>	sync.writeLock().unlock();
1060	>	Thread.sleep(SHORT_DELAY_MS);
1061	>	assertFalse(sync.hasQueuedThread(t1));
1062	>	Thread.sleep(SHORT_DELAY_MS);
1063	>	assertFalse(sync.hasQueuedThread(t2));
1064	>	t1.join();
1065	>	t2.join();
1066	>	}
1067	>
1068	>
1069	>	/**
1070	>	* getQueueLength reports number of waiting threads
1071	>	*/
1072	>	public void testGetQueueLength() throws InterruptedException {
1073	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1074	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1075	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1076	>	assertEquals(0, lock.getQueueLength());
1077	>	lock.writeLock().lock();
1078	>	t1.start();
1079	>	Thread.sleep(SHORT_DELAY_MS);
1080	>	assertEquals(1, lock.getQueueLength());
1081	>	t2.start();
1082	>	Thread.sleep(SHORT_DELAY_MS);
1083	>	assertEquals(2, lock.getQueueLength());
1084	>	t1.interrupt();
1085	>	Thread.sleep(SHORT_DELAY_MS);
1086	>	assertEquals(1, lock.getQueueLength());
1087	>	lock.writeLock().unlock();
1088	>	Thread.sleep(SHORT_DELAY_MS);
1089	>	assertEquals(0, lock.getQueueLength());
1090	>	t1.join();
1091	>	t2.join();
1092		}
1093
1094	<	public void testAwait_Interrupt() {
1095	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1094	>	/**
1095	>	* getQueuedThreads includes waiting threads
1096	>	*/
1097	>	public void testGetQueuedThreads() throws InterruptedException {
1098	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1099	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1100	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1101	>	assertTrue(lock.getQueuedThreads().isEmpty());
1102	>	lock.writeLock().lock();
1103	>	assertTrue(lock.getQueuedThreads().isEmpty());
1104	>	t1.start();
1105	>	Thread.sleep(SHORT_DELAY_MS);
1106	>	assertTrue(lock.getQueuedThreads().contains(t1));
1107	>	t2.start();
1108	>	Thread.sleep(SHORT_DELAY_MS);
1109	>	assertTrue(lock.getQueuedThreads().contains(t1));
1110	>	assertTrue(lock.getQueuedThreads().contains(t2));
1111	>	t1.interrupt();
1112	>	Thread.sleep(SHORT_DELAY_MS);
1113	>	assertFalse(lock.getQueuedThreads().contains(t1));
1114	>	assertTrue(lock.getQueuedThreads().contains(t2));
1115	>	lock.writeLock().unlock();
1116	>	Thread.sleep(SHORT_DELAY_MS);
1117	>	assertTrue(lock.getQueuedThreads().isEmpty());
1118	>	t1.join();
1119	>	t2.join();
1120	>	}
1121	>
1122	>	/**
1123	>	* hasWaiters throws NPE if null
1124	>	*/
1125	>	public void testHasWaitersNPE() {
1126	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1127	>	try {
1128	>	lock.hasWaiters(null);
1129	>	shouldThrow();
1130	>	} catch (NullPointerException success) {}
1131	>	}
1132	>
1133	>	/**
1134	>	* getWaitQueueLength throws NPE if null
1135	>	*/
1136	>	public void testGetWaitQueueLengthNPE() {
1137	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1138	>	try {
1139	>	lock.getWaitQueueLength(null);
1140	>	shouldThrow();
1141	>	} catch (NullPointerException success) {}
1142	>	}
1143	>
1144	>
1145	>	/**
1146	>	* getWaitingThreads throws NPE if null
1147	>	*/
1148	>	public void testGetWaitingThreadsNPE() {
1149	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1150	>	try {
1151	>	lock.getWaitingThreads(null);
1152	>	shouldThrow();
1153	>	} catch (NullPointerException success) {}
1154	>	}
1155	>
1156	>	/**
1157	>	* hasWaiters throws IAE if not owned
1158	>	*/
1159	>	public void testHasWaitersIAE() {
1160	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1161		final Condition c = lock.writeLock().newCondition();
1162	<	Thread t = new Thread(new Runnable() {
1163	<	public void run() {
1164	<	try {
1165	<	lock.writeLock().lock();
1166	<	c.await();
1167	<	lock.writeLock().unlock();
514	<	fail("should throw");
515	<	}
516	<	catch(InterruptedException success) {
517	<	}
518	<	}
519	<	});
1162	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1163	>	try {
1164	>	lock2.hasWaiters(c);
1165	>	shouldThrow();
1166	>	} catch (IllegalArgumentException success) {}
1167	>	}
1168
1169	+	/**
1170	+	* hasWaiters throws IMSE if not locked
1171	+	*/
1172	+	public void testHasWaitersIMSE() {
1173	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1174	+	final Condition c = lock.writeLock().newCondition();
1175		try {
1176	<	t.start();
1177	<	Thread.sleep(SHORT_DELAY_MS);
1178	<	t.interrupt();
525	<	t.join(SHORT_DELAY_MS);
526	<	assertFalse(t.isAlive());
527	<	}
528	<	catch (Exception ex) {
529	<	fail("unexpected exception");
530	<	}
1176	>	lock.hasWaiters(c);
1177	>	shouldThrow();
1178	>	} catch (IllegalMonitorStateException success) {}
1179		}
1180
1181	<	public void testAwaitNanos_Interrupt() {
1182	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1181	>
1182	>	/**
1183	>	* getWaitQueueLength throws IAE if not owned
1184	>	*/
1185	>	public void testGetWaitQueueLengthIAE() {
1186	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1187		final Condition c = lock.writeLock().newCondition();
1188	<	Thread t = new Thread(new Runnable() {
1189	<	public void run() {
1190	<	try {
1191	<	lock.writeLock().lock();
1192	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
1193	<	lock.writeLock().unlock();
542	<	fail("should throw");
543	<	}
544	<	catch(InterruptedException success) {
545	<	}
546	<	}
547	<	});
1188	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1189	>	try {
1190	>	lock2.getWaitQueueLength(c);
1191	>	shouldThrow();
1192	>	} catch (IllegalArgumentException success) {}
1193	>	}
1194
1195	+	/**
1196	+	* getWaitQueueLength throws IMSE if not locked
1197	+	*/
1198	+	public void testGetWaitQueueLengthIMSE() {
1199	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1200	+	final Condition c = lock.writeLock().newCondition();
1201		try {
1202	<	t.start();
1203	<	Thread.sleep(SHORT_DELAY_MS);
1204	<	t.interrupt();
553	<	t.join(SHORT_DELAY_MS);
554	<	assertFalse(t.isAlive());
555	<	}
556	<	catch (Exception ex) {
557	<	fail("unexpected exception");
558	<	}
1202	>	lock.getWaitQueueLength(c);
1203	>	shouldThrow();
1204	>	} catch (IllegalMonitorStateException success) {}
1205		}
1206
1207	<	public void testAwaitUntil_Interrupt() {
1208	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1207	>
1208	>	/**
1209	>	* getWaitingThreads throws IAE if not owned
1210	>	*/
1211	>	public void testGetWaitingThreadsIAE() {
1212	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1213		final Condition c = lock.writeLock().newCondition();
1214	<	Thread t = new Thread(new Runnable() {
1215	<	public void run() {
1216	<	try {
1217	<	lock.writeLock().lock();
1218	<	java.util.Date d = new java.util.Date();
1219	<	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
570	<	lock.writeLock().unlock();
571	<	fail("should throw");
572	<	}
573	<	catch(InterruptedException success) {
574	<	}
575	<	}
576	<	});
1214	>	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1215	>	try {
1216	>	lock2.getWaitingThreads(c);
1217	>	shouldThrow();
1218	>	} catch (IllegalArgumentException success) {}
1219	>	}
1220
1221	+	/**
1222	+	* getWaitingThreads throws IMSE if not locked
1223	+	*/
1224	+	public void testGetWaitingThreadsIMSE() {
1225	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1226	+	final Condition c = lock.writeLock().newCondition();
1227		try {
1228	<	t.start();
1229	<	Thread.sleep(SHORT_DELAY_MS);
1230	<	t.interrupt();
582	<	t.join(SHORT_DELAY_MS);
583	<	assertFalse(t.isAlive());
584	<	}
585	<	catch (Exception ex) {
586	<	fail("unexpected exception");
587	<	}
1228	>	lock.getWaitingThreads(c);
1229	>	shouldThrow();
1230	>	} catch (IllegalMonitorStateException success) {}
1231		}
1232
1233	<	public void testSignalAll() {
1234	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1233	>
1234	>	/**
1235	>	* hasWaiters returns true when a thread is waiting, else false
1236	>	*/
1237	>	public void testHasWaiters() throws InterruptedException {
1238	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1239		final Condition c = lock.writeLock().newCondition();
1240	<	Thread t1 = new Thread(new Runnable() {
1241	<	public void run() {
1242	<	try {
1243	<	lock.writeLock().lock();
1244	<	c.await();
1245	<	lock.writeLock().unlock();
1246	<	}
1247	<	catch(InterruptedException e) {
1248	<	fail("unexpected exception");
1249	<	}
1250	<	}
1251	<	});
1240	>	Thread t = new Thread(new CheckedRunnable() {
1241	>	public void realRun() throws InterruptedException {
1242	>	lock.writeLock().lock();
1243	>	threadAssertFalse(lock.hasWaiters(c));
1244	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1245	>	c.await();
1246	>	lock.writeLock().unlock();
1247	>	}});
1248	>
1249	>	t.start();
1250	>	Thread.sleep(SHORT_DELAY_MS);
1251	>	lock.writeLock().lock();
1252	>	assertTrue(lock.hasWaiters(c));
1253	>	assertEquals(1, lock.getWaitQueueLength(c));
1254	>	c.signal();
1255	>	lock.writeLock().unlock();
1256	>	Thread.sleep(SHORT_DELAY_MS);
1257	>	lock.writeLock().lock();
1258	>	assertFalse(lock.hasWaiters(c));
1259	>	assertEquals(0, lock.getWaitQueueLength(c));
1260	>	lock.writeLock().unlock();
1261	>	t.join(SHORT_DELAY_MS);
1262	>	assertFalse(t.isAlive());
1263	>	}
1264
1265	<	Thread t2 = new Thread(new Runnable() {
1266	<	public void run() {
1267	<	try {
1268	<	lock.writeLock().lock();
1269	<	c.await();
1270	<	lock.writeLock().unlock();
1271	<	}
1272	<	catch(InterruptedException e) {
1273	<	fail("unexpected exception");
1274	<	}
1275	<	}
1276	<	});
1265	>	/**
1266	>	* getWaitQueueLength returns number of waiting threads
1267	>	*/
1268	>	public void testGetWaitQueueLength() throws InterruptedException {
1269	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1270	>	final Condition c = lock.writeLock().newCondition();
1271	>	Thread t = new Thread(new CheckedRunnable() {
1272	>	public void realRun() throws InterruptedException {
1273	>	lock.writeLock().lock();
1274	>	threadAssertFalse(lock.hasWaiters(c));
1275	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1276	>	c.await();
1277	>	lock.writeLock().unlock();
1278	>	}});
1279	>
1280	>	t.start();
1281	>	Thread.sleep(SHORT_DELAY_MS);
1282	>	lock.writeLock().lock();
1283	>	assertTrue(lock.hasWaiters(c));
1284	>	assertEquals(1, lock.getWaitQueueLength(c));
1285	>	c.signal();
1286	>	lock.writeLock().unlock();
1287	>	Thread.sleep(SHORT_DELAY_MS);
1288	>	lock.writeLock().lock();
1289	>	assertFalse(lock.hasWaiters(c));
1290	>	assertEquals(0, lock.getWaitQueueLength(c));
1291	>	lock.writeLock().unlock();
1292	>	t.join(SHORT_DELAY_MS);
1293	>	assertFalse(t.isAlive());
1294	>	}
1295
1296	<	try {
1297	<	t1.start();
1298	<	t2.start();
1299	<	Thread.sleep(SHORT_DELAY_MS);
1300	<	lock.writeLock().lock();
1301	<	c.signalAll();
1302	<	lock.writeLock().unlock();
1303	<	t1.join(SHORT_DELAY_MS);
1304	<	t2.join(SHORT_DELAY_MS);
1305	<	assertFalse(t1.isAlive());
1306	<	assertFalse(t2.isAlive());
1307	<	}
1308	<	catch (Exception ex) {
1309	<	fail("unexpected exception");
1310	<	}
1296	>
1297	>	/**
1298	>	* getWaitingThreads returns only and all waiting threads
1299	>	*/
1300	>	public void testGetWaitingThreads() throws InterruptedException {
1301	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1302	>	final Condition c = lock.writeLock().newCondition();
1303	>	Thread t1 = new Thread(new CheckedRunnable() {
1304	>	public void realRun() throws InterruptedException {
1305	>	lock.writeLock().lock();
1306	>	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1307	>	c.await();
1308	>	lock.writeLock().unlock();
1309	>	}});
1310	>
1311	>	Thread t2 = new Thread(new CheckedRunnable() {
1312	>	public void realRun() throws InterruptedException {
1313	>	lock.writeLock().lock();
1314	>	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1315	>	c.await();
1316	>	lock.writeLock().unlock();
1317	>	}});
1318	>
1319	>	lock.writeLock().lock();
1320	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1321	>	lock.writeLock().unlock();
1322	>	t1.start();
1323	>	Thread.sleep(SHORT_DELAY_MS);
1324	>	t2.start();
1325	>	Thread.sleep(SHORT_DELAY_MS);
1326	>	lock.writeLock().lock();
1327	>	assertTrue(lock.hasWaiters(c));
1328	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
1329	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
1330	>	c.signalAll();
1331	>	lock.writeLock().unlock();
1332	>	Thread.sleep(SHORT_DELAY_MS);
1333	>	lock.writeLock().lock();
1334	>	assertFalse(lock.hasWaiters(c));
1335	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1336	>	lock.writeLock().unlock();
1337	>	t1.join(SHORT_DELAY_MS);
1338	>	t2.join(SHORT_DELAY_MS);
1339	>	assertFalse(t1.isAlive());
1340	>	assertFalse(t2.isAlive());
1341		}
1342
1343	<	public void testSerialization() {
1344	<	ReentrantReadWriteLock l = new ReentrantReadWriteLock();
1345	<	l.readLock().lock();
1346	<	l.readLock().unlock();
1343	>	/**
1344	>	* toString indicates current lock state
1345	>	*/
1346	>	public void testToString() {
1347	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1348	>	String us = lock.toString();
1349	>	assertTrue(us.indexOf("Write locks = 0") >= 0);
1350	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1351	>	lock.writeLock().lock();
1352	>	String ws = lock.toString();
1353	>	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1354	>	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1355	>	lock.writeLock().unlock();
1356	>	lock.readLock().lock();
1357	>	lock.readLock().lock();
1358	>	String rs = lock.toString();
1359	>	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1360	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1361	>	}
1362
1363	<	try {
1364	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1365	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1366	<	out.writeObject(l);
1367	<	out.close();
1368	<
1369	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1370	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1371	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1372	<	r.readLock().lock();
1373	<	r.readLock().unlock();
652	<	} catch(Exception e){
653	<	e.printStackTrace();
654	<	fail("unexpected exception");
655	<	}
1363	>	/**
1364	>	* readLock.toString indicates current lock state
1365	>	*/
1366	>	public void testReadLockToString() {
1367	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1368	>	String us = lock.readLock().toString();
1369	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1370	>	lock.readLock().lock();
1371	>	lock.readLock().lock();
1372	>	String rs = lock.readLock().toString();
1373	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1374		}
1375
1376	+	/**
1377	+	* writeLock.toString indicates current lock state
1378	+	*/
1379	+	public void testWriteLockToString() {
1380	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1381	+	String us = lock.writeLock().toString();
1382	+	assertTrue(us.indexOf("Unlocked") >= 0);
1383	+	lock.writeLock().lock();
1384	+	String ls = lock.writeLock().toString();
1385	+	assertTrue(ls.indexOf("Locked") >= 0);
1386	+	}
1387
1388		}

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