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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 1.34 by jsr166, Tue Nov 17 14:45:32 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();
697	<	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	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
697	>	lock.writeLock().unlock();
698		}
699
700	<	public void testLockInterruptibly2() {
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	<	try {
706	<	lock.writeLock().lockInterruptibly();
707	<	} catch(Exception e) {
708	<	fail("unexpected exception");
709	<	}
710	<	Thread t = new Thread(new Runnable() {
711	<	public void run() {
712	<	try {
713	<	lock.readLock().lockInterruptibly();
714	<	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	<	}
705	>	lock.writeLock().lock();
706	>	Thread t = new Thread(new CheckedRunnable() {
707	>	public void realRun() throws InterruptedException {
708	>	threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS));
709	>	}});
710	>
711	>	t.start();
712	>	t.join();
713	>	assertTrue(lock.writeLock().isHeldByCurrentThread());
714	>	lock.writeLock().unlock();
715		}
716
717	<	public void testAwait_IllegalMonitor() {
718	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
717	>
718	>	/**
719	>	* write lockInterruptibly succeeds if lock free else is interruptible
720	>	*/
721	>	public void testWriteLockInterruptibly() throws InterruptedException {
722	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
723	>	lock.writeLock().lockInterruptibly();
724	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
725	>	public void realRun() throws InterruptedException {
726	>	lock.writeLock().lockInterruptibly();
727	>	}});
728	>
729	>	t.start();
730	>	Thread.sleep(SHORT_DELAY_MS);
731	>	t.interrupt();
732	>	Thread.sleep(SHORT_DELAY_MS);
733	>	t.join();
734	>	lock.writeLock().unlock();
735	>	}
736	>
737	>	/**
738	>	*  read lockInterruptibly succeeds if lock free else is interruptible
739	>	*/
740	>	public void testReadLockInterruptibly() throws InterruptedException {
741	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
742	>	lock.writeLock().lockInterruptibly();
743	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
744	>	public void realRun() throws InterruptedException {
745	>	lock.readLock().lockInterruptibly();
746	>	}});
747	>
748	>	t.start();
749	>	Thread.sleep(SHORT_DELAY_MS);
750	>	t.interrupt();
751	>	t.join();
752	>	lock.writeLock().unlock();
753	>	}
754	>
755	>	/**
756	>	* Calling await without holding lock throws IllegalMonitorStateException
757	>	*/
758	>	public void testAwait_IllegalMonitor() throws InterruptedException {
759	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
760		final Condition c = lock.writeLock().newCondition();
761		try {
762		c.await();
763	<	fail("should throw");
764	<	}
387	<	catch (IllegalMonitorStateException success) {
388	<	}
389	<	catch (Exception ex) {
390	<	fail("should throw IMSE");
391	<	}
763	>	shouldThrow();
764	>	} catch (IllegalMonitorStateException success) {}
765		}
766
767	+	/**
768	+	* Calling signal without holding lock throws IllegalMonitorStateException
769	+	*/
770		public void testSignal_IllegalMonitor() {
771	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
771	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
772		final Condition c = lock.writeLock().newCondition();
773		try {
774		c.signal();
775	<	fail("should throw");
776	<	}
401	<	catch (IllegalMonitorStateException success) {
402	<	}
403	<	catch (Exception ex) {
404	<	fail("should throw IMSE");
405	<	}
775	>	shouldThrow();
776	>	} catch (IllegalMonitorStateException success) {}
777		}
778
779	<	public void testAwaitNanos_Timeout() {
780	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
779	>	/**
780	>	* awaitNanos without a signal times out
781	>	*/
782	>	public void testAwaitNanos_Timeout() throws InterruptedException {
783	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
784		final Condition c = lock.writeLock().newCondition();
785	<	try {
786	<	lock.writeLock().lock();
787	<	long t = c.awaitNanos(100);
788	<	assertTrue(t <= 0);
789	<	lock.writeLock().unlock();
416	<	}
417	<	catch (Exception ex) {
418	<	fail("unexpected exception");
419	<	}
785	>
786	>	lock.writeLock().lock();
787	>	long t = c.awaitNanos(100);
788	>	assertTrue(t <= 0);
789	>	lock.writeLock().unlock();
790		}
791
792	<	public void testAwait_Timeout() {
793	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
792	>
793	>	/**
794	>	*  timed await without a signal times out
795	>	*/
796	>	public void testAwait_Timeout() throws InterruptedException {
797	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
798		final Condition c = lock.writeLock().newCondition();
799	<	try {
800	<	lock.writeLock().lock();
801	<	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
428	<	lock.writeLock().unlock();
429	<	}
430	<	catch (Exception ex) {
431	<	fail("unexpected exception");
432	<	}
799	>	lock.writeLock().lock();
800	>	assertFalse(c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
801	>	lock.writeLock().unlock();
802		}
803
804	<	public void testAwaitUntil_Timeout() {
805	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
804	>	/**
805	>	* awaitUntil without a signal times out
806	>	*/
807	>	public void testAwaitUntil_Timeout() throws InterruptedException {
808	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
809		final Condition c = lock.writeLock().newCondition();
810	<	try {
811	<	lock.writeLock().lock();
812	<	java.util.Date d = new java.util.Date();
813	<	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
814	<	lock.writeLock().unlock();
815	<	}
816	<	catch (Exception ex) {
817	<	fail("unexpected exception");
810	>	lock.writeLock().lock();
811	>	java.util.Date d = new java.util.Date();
812	>	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
813	>	lock.writeLock().unlock();
814	>	}
815	>
816	>	/**
817	>	* await returns when signalled
818	>	*/
819	>	public void testAwait() throws InterruptedException {
820	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
821	>	final Condition c = lock.writeLock().newCondition();
822	>	Thread t = new Thread(new CheckedRunnable() {
823	>	public void realRun() throws InterruptedException {
824	>	lock.writeLock().lock();
825	>	c.await();
826	>	lock.writeLock().unlock();
827	>	}});
828	>
829	>	t.start();
830	>	Thread.sleep(SHORT_DELAY_MS);
831	>	lock.writeLock().lock();
832	>	c.signal();
833	>	lock.writeLock().unlock();
834	>	t.join(SHORT_DELAY_MS);
835	>	assertFalse(t.isAlive());
836	>	}
837	>
838	>	/** A helper class for uninterruptible wait tests */
839	>	class UninterruptableThread extends Thread {
840	>	private Lock lock;
841	>	private Condition c;
842	>
843	>	public volatile boolean canAwake = false;
844	>	public volatile boolean interrupted = false;
845	>	public volatile boolean lockStarted = false;
846	>
847	>	public UninterruptableThread(Lock lock, Condition c) {
848	>	this.lock = lock;
849	>	this.c = c;
850	>	}
851	>
852	>	public synchronized void run() {
853	>	lock.lock();
854	>	lockStarted = true;
855	>
856	>	while (!canAwake) {
857	>	c.awaitUninterruptibly();
858	>	}
859	>
860	>	interrupted = isInterrupted();
861	>	lock.unlock();
862		}
863		}
864
865	<	public void testAwait() {
866	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
865	>	/**
866	>	* awaitUninterruptibly doesn't abort on interrupt
867	>	*/
868	>	public void testAwaitUninterruptibly() throws InterruptedException {
869	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
870		final Condition c = lock.writeLock().newCondition();
871	<	Thread t = new Thread(new Runnable() {
872	<	public void run() {
873	<	try {
455	<	lock.writeLock().lock();
456	<	c.await();
457	<	lock.writeLock().unlock();
458	<	}
459	<	catch(InterruptedException e) {
460	<	fail("unexpected exception");
461	<	}
462	<	}
463	<	});
871	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
872	>
873	>	thread.start();
874
875	+	while (!thread.lockStarted) {
876	+	Thread.sleep(100);
877	+	}
878	+
879	+	lock.writeLock().lock();
880		try {
881	<	t.start();
882	<	Thread.sleep(SHORT_DELAY_MS);
468	<	lock.writeLock().lock();
881	>	thread.interrupt();
882	>	thread.canAwake = true;
883		c.signal();
884	+	} finally {
885		lock.writeLock().unlock();
471	–	t.join(SHORT_DELAY_MS);
472	–	assertFalse(t.isAlive());
473	–	}
474	–	catch (Exception ex) {
475	–	fail("unexpected exception");
886		}
887	+
888	+	thread.join();
889	+	assertTrue(thread.interrupted);
890	+	assertFalse(thread.isAlive());
891		}
892
893	<	public void testAwaitUninterruptibly() {
894	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
893	>	/**
894	>	* await is interruptible
895	>	*/
896	>	public void testAwait_Interrupt() throws InterruptedException {
897	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
898		final Condition c = lock.writeLock().newCondition();
899	<	Thread t = new Thread(new Runnable() {
900	<	public void run() {
901	<	lock.writeLock().lock();
902	<	c.awaitUninterruptibly();
903	<	lock.writeLock().unlock();
904	<	}
905	<	});
899	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
900	>	public void realRun() throws InterruptedException {
901	>	lock.writeLock().lock();
902	>	c.await();
903	>	lock.writeLock().unlock();
904	>	}});
905	>
906	>	t.start();
907	>	Thread.sleep(SHORT_DELAY_MS);
908	>	t.interrupt();
909	>	t.join(SHORT_DELAY_MS);
910	>	assertFalse(t.isAlive());
911	>	}
912
913	+	/**
914	+	* awaitNanos is interruptible
915	+	*/
916	+	public void testAwaitNanos_Interrupt() throws InterruptedException {
917	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
918	+	final Condition c = lock.writeLock().newCondition();
919	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
920	+	public void realRun() throws InterruptedException {
921	+	lock.writeLock().lock();
922	+	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
923	+	lock.writeLock().unlock();
924	+	}});
925	+
926	+	t.start();
927	+	Thread.sleep(SHORT_DELAY_MS);
928	+	t.interrupt();
929	+	t.join(SHORT_DELAY_MS);
930	+	assertFalse(t.isAlive());
931	+	}
932	+
933	+	/**
934	+	* awaitUntil is interruptible
935	+	*/
936	+	public void testAwaitUntil_Interrupt() throws InterruptedException {
937	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
938	+	final Condition c = lock.writeLock().newCondition();
939	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
940	+	public void realRun() throws InterruptedException {
941	+	lock.writeLock().lock();
942	+	java.util.Date d = new java.util.Date();
943	+	c.awaitUntil(new java.util.Date(d.getTime() + 10000));
944	+	lock.writeLock().unlock();
945	+	}});
946	+
947	+	t.start();
948	+	Thread.sleep(SHORT_DELAY_MS);
949	+	t.interrupt();
950	+	t.join(SHORT_DELAY_MS);
951	+	assertFalse(t.isAlive());
952	+	}
953	+
954	+	/**
955	+	* signalAll wakes up all threads
956	+	*/
957	+	public void testSignalAll() throws InterruptedException {
958	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
959	+	final Condition c = lock.writeLock().newCondition();
960	+	Thread t1 = new Thread(new CheckedRunnable() {
961	+	public void realRun() throws InterruptedException {
962	+	lock.writeLock().lock();
963	+	c.await();
964	+	lock.writeLock().unlock();
965	+	}});
966	+
967	+	Thread t2 = new Thread(new CheckedRunnable() {
968	+	public void realRun() throws InterruptedException {
969	+	lock.writeLock().lock();
970	+	c.await();
971	+	lock.writeLock().unlock();
972	+	}});
973	+
974	+	t1.start();
975	+	t2.start();
976	+	Thread.sleep(SHORT_DELAY_MS);
977	+	lock.writeLock().lock();
978	+	c.signalAll();
979	+	lock.writeLock().unlock();
980	+	t1.join(SHORT_DELAY_MS);
981	+	t2.join(SHORT_DELAY_MS);
982	+	assertFalse(t1.isAlive());
983	+	assertFalse(t2.isAlive());
984	+	}
985	+
986	+	/**
987	+	* A serialized lock deserializes as unlocked
988	+	*/
989	+	public void testSerialization() throws Exception {
990	+	ReentrantReadWriteLock l = new ReentrantReadWriteLock();
991	+	l.readLock().lock();
992	+	l.readLock().unlock();
993	+
994	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
995	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
996	+	out.writeObject(l);
997	+	out.close();
998	+
999	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1000	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1001	+	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1002	+	r.readLock().lock();
1003	+	r.readLock().unlock();
1004	+	}
1005	+
1006	+	/**
1007	+	* hasQueuedThreads reports whether there are waiting threads
1008	+	*/
1009	+	public void testhasQueuedThreads() throws InterruptedException {
1010	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1011	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1012	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1013	+	assertFalse(lock.hasQueuedThreads());
1014	+	lock.writeLock().lock();
1015	+	t1.start();
1016	+	Thread.sleep(SHORT_DELAY_MS);
1017	+	assertTrue(lock.hasQueuedThreads());
1018	+	t2.start();
1019	+	Thread.sleep(SHORT_DELAY_MS);
1020	+	assertTrue(lock.hasQueuedThreads());
1021	+	t1.interrupt();
1022	+	Thread.sleep(SHORT_DELAY_MS);
1023	+	assertTrue(lock.hasQueuedThreads());
1024	+	lock.writeLock().unlock();
1025	+	Thread.sleep(SHORT_DELAY_MS);
1026	+	assertFalse(lock.hasQueuedThreads());
1027	+	t1.join();
1028	+	t2.join();
1029	+	}
1030	+
1031	+	/**
1032	+	* hasQueuedThread(null) throws NPE
1033	+	*/
1034	+	public void testHasQueuedThreadNPE() {
1035	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1036		try {
1037	<	t.start();
1038	<	Thread.sleep(SHORT_DELAY_MS);
1039	<	t.interrupt();
1040	<	lock.writeLock().lock();
1041	<	c.signal();
1042	<	lock.writeLock().unlock();
1043	<	t.join(SHORT_DELAY_MS);
1044	<	assertFalse(t.isAlive());
1045	<	}
1046	<	catch (Exception ex) {
1047	<	fail("unexpected exception");
1048	<	}
1037	>	sync.hasQueuedThread(null);
1038	>	shouldThrow();
1039	>	} catch (NullPointerException success) {}
1040	>	}
1041	>
1042	>	/**
1043	>	* hasQueuedThread reports whether a thread is queued.
1044	>	*/
1045	>	public void testHasQueuedThread() throws InterruptedException {
1046	>	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1047	>	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1048	>	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1049	>	assertFalse(sync.hasQueuedThread(t1));
1050	>	assertFalse(sync.hasQueuedThread(t2));
1051	>	sync.writeLock().lock();
1052	>	t1.start();
1053	>	Thread.sleep(SHORT_DELAY_MS);
1054	>	assertTrue(sync.hasQueuedThread(t1));
1055	>	t2.start();
1056	>	Thread.sleep(SHORT_DELAY_MS);
1057	>	assertTrue(sync.hasQueuedThread(t1));
1058	>	assertTrue(sync.hasQueuedThread(t2));
1059	>	t1.interrupt();
1060	>	Thread.sleep(SHORT_DELAY_MS);
1061	>	assertFalse(sync.hasQueuedThread(t1));
1062	>	assertTrue(sync.hasQueuedThread(t2));
1063	>	sync.writeLock().unlock();
1064	>	Thread.sleep(SHORT_DELAY_MS);
1065	>	assertFalse(sync.hasQueuedThread(t1));
1066	>	Thread.sleep(SHORT_DELAY_MS);
1067	>	assertFalse(sync.hasQueuedThread(t2));
1068	>	t1.join();
1069	>	t2.join();
1070	>	}
1071	>
1072	>
1073	>	/**
1074	>	* getQueueLength reports number of waiting threads
1075	>	*/
1076	>	public void testGetQueueLength() throws InterruptedException {
1077	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1078	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1079	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1080	>	assertEquals(0, lock.getQueueLength());
1081	>	lock.writeLock().lock();
1082	>	t1.start();
1083	>	Thread.sleep(SHORT_DELAY_MS);
1084	>	assertEquals(1, lock.getQueueLength());
1085	>	t2.start();
1086	>	Thread.sleep(SHORT_DELAY_MS);
1087	>	assertEquals(2, lock.getQueueLength());
1088	>	t1.interrupt();
1089	>	Thread.sleep(SHORT_DELAY_MS);
1090	>	assertEquals(1, lock.getQueueLength());
1091	>	lock.writeLock().unlock();
1092	>	Thread.sleep(SHORT_DELAY_MS);
1093	>	assertEquals(0, lock.getQueueLength());
1094	>	t1.join();
1095	>	t2.join();
1096		}
1097
1098	<	public void testAwait_Interrupt() {
1099	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1098	>	/**
1099	>	* getQueuedThreads includes waiting threads
1100	>	*/
1101	>	public void testGetQueuedThreads() throws InterruptedException {
1102	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1103	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1104	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1105	>	assertTrue(lock.getQueuedThreads().isEmpty());
1106	>	lock.writeLock().lock();
1107	>	assertTrue(lock.getQueuedThreads().isEmpty());
1108	>	t1.start();
1109	>	Thread.sleep(SHORT_DELAY_MS);
1110	>	assertTrue(lock.getQueuedThreads().contains(t1));
1111	>	t2.start();
1112	>	Thread.sleep(SHORT_DELAY_MS);
1113	>	assertTrue(lock.getQueuedThreads().contains(t1));
1114	>	assertTrue(lock.getQueuedThreads().contains(t2));
1115	>	t1.interrupt();
1116	>	Thread.sleep(SHORT_DELAY_MS);
1117	>	assertFalse(lock.getQueuedThreads().contains(t1));
1118	>	assertTrue(lock.getQueuedThreads().contains(t2));
1119	>	lock.writeLock().unlock();
1120	>	Thread.sleep(SHORT_DELAY_MS);
1121	>	assertTrue(lock.getQueuedThreads().isEmpty());
1122	>	t1.join();
1123	>	t2.join();
1124	>	}
1125	>
1126	>	/**
1127	>	* hasWaiters throws NPE if null
1128	>	*/
1129	>	public void testHasWaitersNPE() {
1130	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1131	>	try {
1132	>	lock.hasWaiters(null);
1133	>	shouldThrow();
1134	>	} catch (NullPointerException success) {}
1135	>	}
1136	>
1137	>	/**
1138	>	* getWaitQueueLength throws NPE if null
1139	>	*/
1140	>	public void testGetWaitQueueLengthNPE() {
1141	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1142	>	try {
1143	>	lock.getWaitQueueLength(null);
1144	>	shouldThrow();
1145	>	} catch (NullPointerException success) {}
1146	>	}
1147	>
1148	>
1149	>	/**
1150	>	* getWaitingThreads throws NPE if null
1151	>	*/
1152	>	public void testGetWaitingThreadsNPE() {
1153	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1154	>	try {
1155	>	lock.getWaitingThreads(null);
1156	>	shouldThrow();
1157	>	} catch (NullPointerException success) {}
1158	>	}
1159	>
1160	>	/**
1161	>	* hasWaiters throws IAE if not owned
1162	>	*/
1163	>	public void testHasWaitersIAE() {
1164	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1165		final Condition c = lock.writeLock().newCondition();
1166	<	Thread t = new Thread(new Runnable() {
1167	<	public void run() {
1168	<	try {
1169	<	lock.writeLock().lock();
1170	<	c.await();
1171	<	lock.writeLock().unlock();
514	<	fail("should throw");
515	<	}
516	<	catch(InterruptedException success) {
517	<	}
518	<	}
519	<	});
1166	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1167	>	try {
1168	>	lock2.hasWaiters(c);
1169	>	shouldThrow();
1170	>	} catch (IllegalArgumentException success) {}
1171	>	}
1172
1173	+	/**
1174	+	* hasWaiters throws IMSE if not locked
1175	+	*/
1176	+	public void testHasWaitersIMSE() {
1177	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1178	+	final Condition c = lock.writeLock().newCondition();
1179		try {
1180	<	t.start();
1181	<	Thread.sleep(SHORT_DELAY_MS);
1182	<	t.interrupt();
525	<	t.join(SHORT_DELAY_MS);
526	<	assertFalse(t.isAlive());
527	<	}
528	<	catch (Exception ex) {
529	<	fail("unexpected exception");
530	<	}
1180	>	lock.hasWaiters(c);
1181	>	shouldThrow();
1182	>	} catch (IllegalMonitorStateException success) {}
1183		}
1184
1185	<	public void testAwaitNanos_Interrupt() {
1186	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1185	>
1186	>	/**
1187	>	* getWaitQueueLength throws IAE if not owned
1188	>	*/
1189	>	public void testGetWaitQueueLengthIAE() {
1190	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1191		final Condition c = lock.writeLock().newCondition();
1192	<	Thread t = new Thread(new Runnable() {
1193	<	public void run() {
1194	<	try {
1195	<	lock.writeLock().lock();
1196	<	c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000);
1197	<	lock.writeLock().unlock();
542	<	fail("should throw");
543	<	}
544	<	catch(InterruptedException success) {
545	<	}
546	<	}
547	<	});
1192	>	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1193	>	try {
1194	>	lock2.getWaitQueueLength(c);
1195	>	shouldThrow();
1196	>	} catch (IllegalArgumentException success) {}
1197	>	}
1198
1199	+	/**
1200	+	* getWaitQueueLength throws IMSE if not locked
1201	+	*/
1202	+	public void testGetWaitQueueLengthIMSE() {
1203	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1204	+	final Condition c = lock.writeLock().newCondition();
1205		try {
1206	<	t.start();
1207	<	Thread.sleep(SHORT_DELAY_MS);
1208	<	t.interrupt();
553	<	t.join(SHORT_DELAY_MS);
554	<	assertFalse(t.isAlive());
555	<	}
556	<	catch (Exception ex) {
557	<	fail("unexpected exception");
558	<	}
1206	>	lock.getWaitQueueLength(c);
1207	>	shouldThrow();
1208	>	} catch (IllegalMonitorStateException success) {}
1209		}
1210
1211	<	public void testAwaitUntil_Interrupt() {
1212	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1211	>
1212	>	/**
1213	>	* getWaitingThreads throws IAE if not owned
1214	>	*/
1215	>	public void testGetWaitingThreadsIAE() {
1216	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1217		final Condition c = lock.writeLock().newCondition();
1218	<	Thread t = new Thread(new Runnable() {
1219	<	public void run() {
1220	<	try {
1221	<	lock.writeLock().lock();
1222	<	java.util.Date d = new java.util.Date();
1223	<	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	<	});
1218	>	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1219	>	try {
1220	>	lock2.getWaitingThreads(c);
1221	>	shouldThrow();
1222	>	} catch (IllegalArgumentException success) {}
1223	>	}
1224
1225	+	/**
1226	+	* getWaitingThreads throws IMSE if not locked
1227	+	*/
1228	+	public void testGetWaitingThreadsIMSE() {
1229	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1230	+	final Condition c = lock.writeLock().newCondition();
1231		try {
1232	<	t.start();
1233	<	Thread.sleep(SHORT_DELAY_MS);
1234	<	t.interrupt();
582	<	t.join(SHORT_DELAY_MS);
583	<	assertFalse(t.isAlive());
584	<	}
585	<	catch (Exception ex) {
586	<	fail("unexpected exception");
587	<	}
1232	>	lock.getWaitingThreads(c);
1233	>	shouldThrow();
1234	>	} catch (IllegalMonitorStateException success) {}
1235		}
1236
1237	<	public void testSignalAll() {
1238	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1237	>
1238	>	/**
1239	>	* hasWaiters returns true when a thread is waiting, else false
1240	>	*/
1241	>	public void testHasWaiters() throws InterruptedException {
1242	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1243		final Condition c = lock.writeLock().newCondition();
1244	<	Thread t1 = new Thread(new Runnable() {
1245	<	public void run() {
1246	<	try {
1247	<	lock.writeLock().lock();
1248	<	c.await();
1249	<	lock.writeLock().unlock();
1250	<	}
1251	<	catch(InterruptedException e) {
1252	<	fail("unexpected exception");
1253	<	}
1254	<	}
1255	<	});
1244	>	Thread t = new Thread(new CheckedRunnable() {
1245	>	public void realRun() throws InterruptedException {
1246	>	lock.writeLock().lock();
1247	>	threadAssertFalse(lock.hasWaiters(c));
1248	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1249	>	c.await();
1250	>	lock.writeLock().unlock();
1251	>	}});
1252	>
1253	>	t.start();
1254	>	Thread.sleep(SHORT_DELAY_MS);
1255	>	lock.writeLock().lock();
1256	>	assertTrue(lock.hasWaiters(c));
1257	>	assertEquals(1, lock.getWaitQueueLength(c));
1258	>	c.signal();
1259	>	lock.writeLock().unlock();
1260	>	Thread.sleep(SHORT_DELAY_MS);
1261	>	lock.writeLock().lock();
1262	>	assertFalse(lock.hasWaiters(c));
1263	>	assertEquals(0, lock.getWaitQueueLength(c));
1264	>	lock.writeLock().unlock();
1265	>	t.join(SHORT_DELAY_MS);
1266	>	assertFalse(t.isAlive());
1267	>	}
1268
1269	<	Thread t2 = new Thread(new Runnable() {
1270	<	public void run() {
1271	<	try {
1272	<	lock.writeLock().lock();
1273	<	c.await();
1274	<	lock.writeLock().unlock();
1275	<	}
1276	<	catch(InterruptedException e) {
1277	<	fail("unexpected exception");
1278	<	}
1279	<	}
1280	<	});
1269	>	/**
1270	>	* getWaitQueueLength returns number of waiting threads
1271	>	*/
1272	>	public void testGetWaitQueueLength() throws InterruptedException {
1273	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1274	>	final Condition c = lock.writeLock().newCondition();
1275	>	Thread t = new Thread(new CheckedRunnable() {
1276	>	public void realRun() throws InterruptedException {
1277	>	lock.writeLock().lock();
1278	>	threadAssertFalse(lock.hasWaiters(c));
1279	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1280	>	c.await();
1281	>	lock.writeLock().unlock();
1282	>	}});
1283	>
1284	>	t.start();
1285	>	Thread.sleep(SHORT_DELAY_MS);
1286	>	lock.writeLock().lock();
1287	>	assertTrue(lock.hasWaiters(c));
1288	>	assertEquals(1, lock.getWaitQueueLength(c));
1289	>	c.signal();
1290	>	lock.writeLock().unlock();
1291	>	Thread.sleep(SHORT_DELAY_MS);
1292	>	lock.writeLock().lock();
1293	>	assertFalse(lock.hasWaiters(c));
1294	>	assertEquals(0, lock.getWaitQueueLength(c));
1295	>	lock.writeLock().unlock();
1296	>	t.join(SHORT_DELAY_MS);
1297	>	assertFalse(t.isAlive());
1298	>	}
1299
1300	<	try {
1301	<	t1.start();
1302	<	t2.start();
1303	<	Thread.sleep(SHORT_DELAY_MS);
1304	<	lock.writeLock().lock();
1305	<	c.signalAll();
1306	<	lock.writeLock().unlock();
1307	<	t1.join(SHORT_DELAY_MS);
1308	<	t2.join(SHORT_DELAY_MS);
1309	<	assertFalse(t1.isAlive());
1310	<	assertFalse(t2.isAlive());
1311	<	}
1312	<	catch (Exception ex) {
1313	<	fail("unexpected exception");
1314	<	}
1300	>
1301	>	/**
1302	>	* getWaitingThreads returns only and all waiting threads
1303	>	*/
1304	>	public void testGetWaitingThreads() throws InterruptedException {
1305	>	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1306	>	final Condition c = lock.writeLock().newCondition();
1307	>	Thread t1 = new Thread(new CheckedRunnable() {
1308	>	public void realRun() throws InterruptedException {
1309	>	lock.writeLock().lock();
1310	>	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1311	>	c.await();
1312	>	lock.writeLock().unlock();
1313	>	}});
1314	>
1315	>	Thread t2 = new Thread(new CheckedRunnable() {
1316	>	public void realRun() throws InterruptedException {
1317	>	lock.writeLock().lock();
1318	>	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1319	>	c.await();
1320	>	lock.writeLock().unlock();
1321	>	}});
1322	>
1323	>	lock.writeLock().lock();
1324	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1325	>	lock.writeLock().unlock();
1326	>	t1.start();
1327	>	Thread.sleep(SHORT_DELAY_MS);
1328	>	t2.start();
1329	>	Thread.sleep(SHORT_DELAY_MS);
1330	>	lock.writeLock().lock();
1331	>	assertTrue(lock.hasWaiters(c));
1332	>	assertTrue(lock.getWaitingThreads(c).contains(t1));
1333	>	assertTrue(lock.getWaitingThreads(c).contains(t2));
1334	>	c.signalAll();
1335	>	lock.writeLock().unlock();
1336	>	Thread.sleep(SHORT_DELAY_MS);
1337	>	lock.writeLock().lock();
1338	>	assertFalse(lock.hasWaiters(c));
1339	>	assertTrue(lock.getWaitingThreads(c).isEmpty());
1340	>	lock.writeLock().unlock();
1341	>	t1.join(SHORT_DELAY_MS);
1342	>	t2.join(SHORT_DELAY_MS);
1343	>	assertFalse(t1.isAlive());
1344	>	assertFalse(t2.isAlive());
1345		}
1346
1347	<	public void testSerialization() {
1348	<	ReentrantReadWriteLock l = new ReentrantReadWriteLock();
1349	<	l.readLock().lock();
1350	<	l.readLock().unlock();
1347	>	/**
1348	>	* toString indicates current lock state
1349	>	*/
1350	>	public void testToString() {
1351	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1352	>	String us = lock.toString();
1353	>	assertTrue(us.indexOf("Write locks = 0") >= 0);
1354	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1355	>	lock.writeLock().lock();
1356	>	String ws = lock.toString();
1357	>	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1358	>	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1359	>	lock.writeLock().unlock();
1360	>	lock.readLock().lock();
1361	>	lock.readLock().lock();
1362	>	String rs = lock.toString();
1363	>	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1364	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1365	>	}
1366
1367	<	try {
1368	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1369	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1370	<	out.writeObject(l);
1371	<	out.close();
1372	<
1373	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1374	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1375	<	ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject();
1376	<	r.readLock().lock();
1377	<	r.readLock().unlock();
652	<	} catch(Exception e){
653	<	e.printStackTrace();
654	<	fail("unexpected exception");
655	<	}
1367	>	/**
1368	>	* readLock.toString indicates current lock state
1369	>	*/
1370	>	public void testReadLockToString() {
1371	>	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1372	>	String us = lock.readLock().toString();
1373	>	assertTrue(us.indexOf("Read locks = 0") >= 0);
1374	>	lock.readLock().lock();
1375	>	lock.readLock().lock();
1376	>	String rs = lock.readLock().toString();
1377	>	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1378		}
1379
1380	+	/**
1381	+	* writeLock.toString indicates current lock state
1382	+	*/
1383	+	public void testWriteLockToString() {
1384	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1385	+	String us = lock.writeLock().toString();
1386	+	assertTrue(us.indexOf("Unlocked") >= 0);
1387	+	lock.writeLock().lock();
1388	+	String ls = lock.writeLock().toString();
1389	+	assertTrue(ls.indexOf("Locked") >= 0);
1390	+	}
1391
1392		}

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