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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.4 by dl, Sat Sep 20 18:20:08 2003 UTC vs.
Revision 1.22 by dl, Tue May 3 16:02:00 2005 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 JSR166TestCase {
16		public static void main(String[] args) {
#	Line 18 | Line 20 | public class ReentrantReadWriteLockTest
20		return new TestSuite(ReentrantReadWriteLockTest.class);
21		}
22
23	+	/**
24	+	* A runnable calling lockInterruptibly
25	+	*/
26	+	class InterruptibleLockRunnable implements Runnable {
27	+	final ReentrantReadWriteLock lock;
28	+	InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
29	+	public void run() {
30	+	try {
31	+	lock.writeLock().lockInterruptibly();
32	+	} catch(InterruptedException success){}
33	+	}
34	+	}
35	+
36	+
37	+	/**
38	+	* A runnable calling lockInterruptibly that expects to be
39	+	* interrupted
40	+	*/
41	+	class InterruptedLockRunnable implements Runnable {
42	+	final ReentrantReadWriteLock lock;
43	+	InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
44	+	public void run() {
45	+	try {
46	+	lock.writeLock().lockInterruptibly();
47	+	threadShouldThrow();
48	+	} catch(InterruptedException success){}
49	+	}
50	+	}
51
52	<	/*
52	>	/**
53	>	* Subclass to expose protected methods
54	>	*/
55	>	static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
56	>	PublicReentrantReadWriteLock() { super(); }
57	>	public Collection<Thread> getQueuedThreads() {
58	>	return super.getQueuedThreads();
59	>	}
60	>	public Collection<Thread> getWaitingThreads(Condition c) {
61	>	return super.getWaitingThreads(c);
62	>	}
63	>	}
64	>
65	>	/**
66	>	* Constructor sets given fairness, and is in unlocked state
67	>	*/
68	>	public void testConstructor() {
69	>	ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
70	>	assertFalse(rl.isFair());
71	>	assertFalse(rl.isWriteLocked());
72	>	assertEquals(0, rl.getReadLockCount());
73	>	ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true);
74	>	assertTrue(r2.isFair());
75	>	assertFalse(r2.isWriteLocked());
76	>	assertEquals(0, r2.getReadLockCount());
77	>	}
78	>
79	>	/**
80		* write-locking and read-locking an unlocked lock succeed
81		*/
82		public void testLock() {
83		ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
84		rl.writeLock().lock();
85	+	assertTrue(rl.isWriteLocked());
86	+	assertTrue(rl.isWriteLockedByCurrentThread());
87	+	assertEquals(0, rl.getReadLockCount());
88		rl.writeLock().unlock();
89	+	assertFalse(rl.isWriteLocked());
90	+	assertFalse(rl.isWriteLockedByCurrentThread());
91	+	assertEquals(0, rl.getReadLockCount());
92		rl.readLock().lock();
93	+	assertFalse(rl.isWriteLocked());
94	+	assertFalse(rl.isWriteLockedByCurrentThread());
95	+	assertEquals(1, rl.getReadLockCount());
96		rl.readLock().unlock();
97	+	assertFalse(rl.isWriteLocked());
98	+	assertFalse(rl.isWriteLockedByCurrentThread());
99	+	assertEquals(0, rl.getReadLockCount());
100		}
101
102
103	<	/*
103	>	/**
104		* locking an unlocked fair lock succeeds
105		*/
106		public void testFairLock() {
107		ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true);
108		rl.writeLock().lock();
109	+	assertTrue(rl.isWriteLocked());
110	+	assertTrue(rl.isWriteLockedByCurrentThread());
111	+	assertEquals(0, rl.getReadLockCount());
112		rl.writeLock().unlock();
113	+	assertFalse(rl.isWriteLocked());
114	+	assertFalse(rl.isWriteLockedByCurrentThread());
115	+	assertEquals(0, rl.getReadLockCount());
116		rl.readLock().lock();
117	+	assertFalse(rl.isWriteLocked());
118	+	assertFalse(rl.isWriteLockedByCurrentThread());
119	+	assertEquals(1, rl.getReadLockCount());
120		rl.readLock().unlock();
121	+	assertFalse(rl.isWriteLocked());
122	+	assertFalse(rl.isWriteLockedByCurrentThread());
123	+	assertEquals(0, rl.getReadLockCount());
124	+	}
125	+
126	+	/**
127	+	* getWriteHoldCount returns number of recursive holds
128	+	*/
129	+	public void testGetHoldCount() {
130	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
131	+	for(int i = 1; i <= SIZE; i++) {
132	+	lock.writeLock().lock();
133	+	assertEquals(i,lock.getWriteHoldCount());
134	+	}
135	+	for(int i = SIZE; i > 0; i--) {
136	+	lock.writeLock().unlock();
137	+	assertEquals(i-1,lock.getWriteHoldCount());
138	+	}
139		}
140	+
141
142		/**
143		* write-unlocking an unlocked lock throws IllegalMonitorStateException
#	Line 59 | Line 156 | public class ReentrantReadWriteLockTest
156		*/
157		public void testWriteLockInterruptibly_Interrupted() {
158		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
62	–	lock.writeLock().lock();
159		Thread t = new Thread(new Runnable() {
160		public void run() {
161		try {
162		lock.writeLock().lockInterruptibly();
163	<	threadShouldThrow();
163	>	lock.writeLock().unlock();
164	>	lock.writeLock().lockInterruptibly();
165	>	lock.writeLock().unlock();
166		} catch(InterruptedException success){}
167		}
168		});
169		try {
170	+	lock.writeLock().lock();
171		t.start();
172		t.interrupt();
173		lock.writeLock().unlock();
#	Line 79 | Line 178 | public class ReentrantReadWriteLockTest
178		}
179
180		/**
181	<	* timed write-trylock is interruptible
181	>	* timed write-tryLock is interruptible
182		*/
183		public void testWriteTryLock_Interrupted() {
184		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 88 | Line 187 | public class ReentrantReadWriteLockTest
187		public void run() {
188		try {
189		lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
91	–	threadShouldThrow();
190		} catch(InterruptedException success){}
191		}
192		});
#	Line 112 | Line 210 | public class ReentrantReadWriteLockTest
210		public void run() {
211		try {
212		lock.readLock().lockInterruptibly();
115	–	threadShouldThrow();
213		} catch(InterruptedException success){}
214		}
215		});
#	Line 127 | Line 224 | public class ReentrantReadWriteLockTest
224		}
225
226		/**
227	<	* timed read-trylock is interruptible
227	>	* timed read-tryLock is interruptible
228		*/
229		public void testReadTryLock_Interrupted() {
230		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 151 | Line 248 | public class ReentrantReadWriteLockTest
248
249
250		/**
251	<	* write-trylock fails if locked
251	>	* write-tryLock fails if locked
252		*/
253		public void testWriteTryLockWhenLocked() {
254		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 171 | Line 268 | public class ReentrantReadWriteLockTest
268		}
269
270		/**
271	<	* read-trylock fails if locked
271	>	* read-tryLock fails if locked
272		*/
273		public void testReadTryLockWhenLocked() {
274		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 279 | Line 376 | public class ReentrantReadWriteLockTest
376		}
377		}
378
379	+	/**
380	+	* Read trylock succeeds if write locked by current thread
381	+	*/
382	+	public void testReadHoldingWriteLock() {
383	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
384	+	lock.writeLock().lock();
385	+	assertTrue(lock.readLock().tryLock());
386	+	lock.readLock().unlock();
387	+	lock.writeLock().unlock();
388	+	}
389
390		/**
391	<	* Read trylock succeeds if readlocked but not writelocked
391	>	* Read lock succeeds if write locked by current thread even if
392	>	* other threads are waiting
393	>	*/
394	>	public void testReadHoldingWriteLock2() {
395	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
396	>	lock.writeLock().lock();
397	>	Thread t1 = new Thread(new Runnable() {
398	>	public void run() {
399	>	lock.readLock().lock();
400	>	lock.readLock().unlock();
401	>	}
402	>	});
403	>	Thread t2 = new Thread(new Runnable() {
404	>	public void run() {
405	>	lock.readLock().lock();
406	>	lock.readLock().unlock();
407	>	}
408	>	});
409	>
410	>	try {
411	>	t1.start();
412	>	t2.start();
413	>	lock.readLock().lock();
414	>	lock.readLock().unlock();
415	>	Thread.sleep(SHORT_DELAY_MS);
416	>	lock.readLock().lock();
417	>	lock.readLock().unlock();
418	>	lock.writeLock().unlock();
419	>	t1.join(MEDIUM_DELAY_MS);
420	>	t2.join(MEDIUM_DELAY_MS);
421	>	assertTrue(!t1.isAlive());
422	>	assertTrue(!t2.isAlive());
423	>
424	>	} catch(Exception e){
425	>	unexpectedException();
426	>	}
427	>	}
428	>
429	>	/**
430	>	* Fair Read trylock succeeds if write locked by current thread
431	>	*/
432	>	public void testReadHoldingWriteLockFair() {
433	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
434	>	lock.writeLock().lock();
435	>	assertTrue(lock.readLock().tryLock());
436	>	lock.readLock().unlock();
437	>	lock.writeLock().unlock();
438	>	}
439	>
440	>	/**
441	>	* Fair Read lock succeeds if write locked by current thread even if
442	>	* other threads are waiting
443	>	*/
444	>	public void testReadHoldingWriteLockFair2() {
445	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
446	>	lock.writeLock().lock();
447	>	Thread t1 = new Thread(new Runnable() {
448	>	public void run() {
449	>	lock.readLock().lock();
450	>	lock.readLock().unlock();
451	>	}
452	>	});
453	>	Thread t2 = new Thread(new Runnable() {
454	>	public void run() {
455	>	lock.readLock().lock();
456	>	lock.readLock().unlock();
457	>	}
458	>	});
459	>
460	>	try {
461	>	t1.start();
462	>	t2.start();
463	>	lock.readLock().lock();
464	>	lock.readLock().unlock();
465	>	Thread.sleep(SHORT_DELAY_MS);
466	>	lock.readLock().lock();
467	>	lock.readLock().unlock();
468	>	lock.writeLock().unlock();
469	>	t1.join(MEDIUM_DELAY_MS);
470	>	t2.join(MEDIUM_DELAY_MS);
471	>	assertTrue(!t1.isAlive());
472	>	assertTrue(!t2.isAlive());
473	>
474	>	} catch(Exception e){
475	>	unexpectedException();
476	>	}
477	>	}
478	>
479	>
480	>	/**
481	>	* Read tryLock succeeds if readlocked but not writelocked
482		*/
483		public void testTryLockWhenReadLocked() {
484		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 304 | Line 501 | public class ReentrantReadWriteLockTest
501
502
503		/**
504	<	* write trylock fails when readlocked
504	>	* write tryLock fails when readlocked
505		*/
506		public void testWriteTryLockWhenReadLocked() {
507		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 326 | Line 523 | public class ReentrantReadWriteLockTest
523
524
525		/**
526	<	* write timed trylock times out if locked
526	>	* write timed tryLock times out if locked
527		*/
528		public void testWriteTryLock_Timeout() {
529		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 350 | Line 547 | public class ReentrantReadWriteLockTest
547		}
548
549		/**
550	<	* read timed trylock times out if write-locked
550	>	* read timed tryLock times out if write-locked
551		*/
552		public void testReadTryLock_Timeout() {
553		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 494 | Line 691 | public class ReentrantReadWriteLockTest
691		final Condition c = lock.writeLock().newCondition();
692		try {
693		lock.writeLock().lock();
497	–	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
694		lock.writeLock().unlock();
695		}
696		catch (Exception ex) {
#	Line 511 | Line 707 | public class ReentrantReadWriteLockTest
707		try {
708		lock.writeLock().lock();
709		java.util.Date d = new java.util.Date();
514	–	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
710		lock.writeLock().unlock();
711		}
712		catch (Exception ex) {
#	Line 552 | Line 747 | public class ReentrantReadWriteLockTest
747		}
748		}
749
750	+	/** A helper class for uninterruptible wait tests */
751	+	class UninterruptableThread extends Thread {
752	+	private Lock lock;
753	+	private Condition c;
754	+
755	+	public volatile boolean canAwake = false;
756	+	public volatile boolean interrupted = false;
757	+	public volatile boolean lockStarted = false;
758	+
759	+	public UninterruptableThread(Lock lock, Condition c) {
760	+	this.lock = lock;
761	+	this.c = c;
762	+	}
763	+
764	+	public synchronized void run() {
765	+	lock.lock();
766	+	lockStarted = true;
767	+
768	+	while (!canAwake) {
769	+	c.awaitUninterruptibly();
770	+	}
771	+
772	+	interrupted = isInterrupted();
773	+	lock.unlock();
774	+	}
775	+	}
776	+
777		/**
778		* awaitUninterruptibly doesn't abort on interrupt
779		*/
780		public void testAwaitUninterruptibly() {
781	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
781	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
782		final Condition c = lock.writeLock().newCondition();
783	<	Thread t = new Thread(new Runnable() {
562	<	public void run() {
563	<	lock.writeLock().lock();
564	<	c.awaitUninterruptibly();
565	<	lock.writeLock().unlock();
566	<	}
567	<	});
783	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
784
785		try {
786	<	t.start();
787	<	Thread.sleep(SHORT_DELAY_MS);
788	<	t.interrupt();
786	>	thread.start();
787	>
788	>	while (!thread.lockStarted) {
789	>	Thread.sleep(100);
790	>	}
791	>
792		lock.writeLock().lock();
793	<	c.signal();
794	<	lock.writeLock().unlock();
795	<	assert(t.isInterrupted());
796	<	t.join(SHORT_DELAY_MS);
797	<	assertFalse(t.isAlive());
798	<	}
799	<	catch (Exception ex) {
793	>	try {
794	>	thread.interrupt();
795	>	thread.canAwake = true;
796	>	c.signal();
797	>	} finally {
798	>	lock.writeLock().unlock();
799	>	}
800	>
801	>	thread.join();
802	>	assertTrue(thread.interrupted);
803	>	assertFalse(thread.isAlive());
804	>	} catch (Exception ex) {
805		unexpectedException();
806		}
807		}
#	Line 750 | Line 974 | public class ReentrantReadWriteLockTest
974		}
975		}
976
977	+	/**
978	+	* hasQueuedThreads reports whether there are waiting threads
979	+	*/
980	+	public void testhasQueuedThreads() {
981	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
982	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
983	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
984	+	try {
985	+	assertFalse(lock.hasQueuedThreads());
986	+	lock.writeLock().lock();
987	+	t1.start();
988	+	Thread.sleep(SHORT_DELAY_MS);
989	+	assertTrue(lock.hasQueuedThreads());
990	+	t2.start();
991	+	Thread.sleep(SHORT_DELAY_MS);
992	+	assertTrue(lock.hasQueuedThreads());
993	+	t1.interrupt();
994	+	Thread.sleep(SHORT_DELAY_MS);
995	+	assertTrue(lock.hasQueuedThreads());
996	+	lock.writeLock().unlock();
997	+	Thread.sleep(SHORT_DELAY_MS);
998	+	assertFalse(lock.hasQueuedThreads());
999	+	t1.join();
1000	+	t2.join();
1001	+	} catch(Exception e){
1002	+	unexpectedException();
1003	+	}
1004	+	}
1005	+
1006	+	/**
1007	+	* hasQueuedThread(null) throws NPE
1008	+	*/
1009	+	public void testHasQueuedThreadNPE() {
1010	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1011	+	try {
1012	+	sync.hasQueuedThread(null);
1013	+	shouldThrow();
1014	+	} catch (NullPointerException success) {
1015	+	}
1016	+	}
1017	+
1018	+	/**
1019	+	* hasQueuedThread reports whether a thread is queued.
1020	+	*/
1021	+	public void testHasQueuedThread() {
1022	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1023	+	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1024	+	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1025	+	try {
1026	+	assertFalse(sync.hasQueuedThread(t1));
1027	+	assertFalse(sync.hasQueuedThread(t2));
1028	+	sync.writeLock().lock();
1029	+	t1.start();
1030	+	Thread.sleep(SHORT_DELAY_MS);
1031	+	assertTrue(sync.hasQueuedThread(t1));
1032	+	t2.start();
1033	+	Thread.sleep(SHORT_DELAY_MS);
1034	+	assertTrue(sync.hasQueuedThread(t1));
1035	+	assertTrue(sync.hasQueuedThread(t2));
1036	+	t1.interrupt();
1037	+	Thread.sleep(SHORT_DELAY_MS);
1038	+	assertFalse(sync.hasQueuedThread(t1));
1039	+	assertTrue(sync.hasQueuedThread(t2));
1040	+	sync.writeLock().unlock();
1041	+	Thread.sleep(SHORT_DELAY_MS);
1042	+	assertFalse(sync.hasQueuedThread(t1));
1043	+	Thread.sleep(SHORT_DELAY_MS);
1044	+	assertFalse(sync.hasQueuedThread(t2));
1045	+	t1.join();
1046	+	t2.join();
1047	+	} catch(Exception e){
1048	+	unexpectedException();
1049	+	}
1050	+	}
1051	+
1052	+
1053	+	/**
1054	+	* getQueueLength reports number of waiting threads
1055	+	*/
1056	+	public void testGetQueueLength() {
1057	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1058	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1059	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1060	+	try {
1061	+	assertEquals(0, lock.getQueueLength());
1062	+	lock.writeLock().lock();
1063	+	t1.start();
1064	+	Thread.sleep(SHORT_DELAY_MS);
1065	+	assertEquals(1, lock.getQueueLength());
1066	+	t2.start();
1067	+	Thread.sleep(SHORT_DELAY_MS);
1068	+	assertEquals(2, lock.getQueueLength());
1069	+	t1.interrupt();
1070	+	Thread.sleep(SHORT_DELAY_MS);
1071	+	assertEquals(1, lock.getQueueLength());
1072	+	lock.writeLock().unlock();
1073	+	Thread.sleep(SHORT_DELAY_MS);
1074	+	assertEquals(0, lock.getQueueLength());
1075	+	t1.join();
1076	+	t2.join();
1077	+	} catch(Exception e){
1078	+	unexpectedException();
1079	+	}
1080	+	}
1081	+
1082	+	/**
1083	+	* getQueuedThreads includes waiting threads
1084	+	*/
1085	+	public void testGetQueuedThreads() {
1086	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1087	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1088	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1089	+	try {
1090	+	assertTrue(lock.getQueuedThreads().isEmpty());
1091	+	lock.writeLock().lock();
1092	+	assertTrue(lock.getQueuedThreads().isEmpty());
1093	+	t1.start();
1094	+	Thread.sleep(SHORT_DELAY_MS);
1095	+	assertTrue(lock.getQueuedThreads().contains(t1));
1096	+	t2.start();
1097	+	Thread.sleep(SHORT_DELAY_MS);
1098	+	assertTrue(lock.getQueuedThreads().contains(t1));
1099	+	assertTrue(lock.getQueuedThreads().contains(t2));
1100	+	t1.interrupt();
1101	+	Thread.sleep(SHORT_DELAY_MS);
1102	+	assertFalse(lock.getQueuedThreads().contains(t1));
1103	+	assertTrue(lock.getQueuedThreads().contains(t2));
1104	+	lock.writeLock().unlock();
1105	+	Thread.sleep(SHORT_DELAY_MS);
1106	+	assertTrue(lock.getQueuedThreads().isEmpty());
1107	+	t1.join();
1108	+	t2.join();
1109	+	} catch(Exception e){
1110	+	unexpectedException();
1111	+	}
1112	+	}
1113	+
1114	+	/**
1115	+	* hasWaiters throws NPE if null
1116	+	*/
1117	+	public void testHasWaitersNPE() {
1118	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1119	+	try {
1120	+	lock.hasWaiters(null);
1121	+	shouldThrow();
1122	+	} catch (NullPointerException success) {
1123	+	} catch (Exception ex) {
1124	+	unexpectedException();
1125	+	}
1126	+	}
1127	+
1128	+	/**
1129	+	* getWaitQueueLength throws NPE if null
1130	+	*/
1131	+	public void testGetWaitQueueLengthNPE() {
1132	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1133	+	try {
1134	+	lock.getWaitQueueLength(null);
1135	+	shouldThrow();
1136	+	} catch (NullPointerException success) {
1137	+	} catch (Exception ex) {
1138	+	unexpectedException();
1139	+	}
1140	+	}
1141	+
1142	+
1143	+	/**
1144	+	* getWaitingThreads throws NPE if null
1145	+	*/
1146	+	public void testGetWaitingThreadsNPE() {
1147	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1148	+	try {
1149	+	lock.getWaitingThreads(null);
1150	+	shouldThrow();
1151	+	} catch (NullPointerException success) {
1152	+	} catch (Exception ex) {
1153	+	unexpectedException();
1154	+	}
1155	+	}
1156	+
1157	+	/**
1158	+	* hasWaiters throws IAE if not owned
1159	+	*/
1160	+	public void testHasWaitersIAE() {
1161	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1162	+	final Condition c = (lock.writeLock().newCondition());
1163	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1164	+	try {
1165	+	lock2.hasWaiters(c);
1166	+	shouldThrow();
1167	+	} catch (IllegalArgumentException success) {
1168	+	} catch (Exception ex) {
1169	+	unexpectedException();
1170	+	}
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	+	lock.hasWaiters(c);
1181	+	shouldThrow();
1182	+	} catch (IllegalMonitorStateException success) {
1183	+	} catch (Exception ex) {
1184	+	unexpectedException();
1185	+	}
1186	+	}
1187	+
1188	+
1189	+	/**
1190	+	* getWaitQueueLength throws IAE if not owned
1191	+	*/
1192	+	public void testGetWaitQueueLengthIAE() {
1193	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1194	+	final Condition c = (lock.writeLock().newCondition());
1195	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1196	+	try {
1197	+	lock2.getWaitQueueLength(c);
1198	+	shouldThrow();
1199	+	} catch (IllegalArgumentException success) {
1200	+	} catch (Exception ex) {
1201	+	unexpectedException();
1202	+	}
1203	+	}
1204	+
1205	+	/**
1206	+	* getWaitQueueLength throws IMSE if not locked
1207	+	*/
1208	+	public void testGetWaitQueueLengthIMSE() {
1209	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1210	+	final Condition c = (lock.writeLock().newCondition());
1211	+	try {
1212	+	lock.getWaitQueueLength(c);
1213	+	shouldThrow();
1214	+	} catch (IllegalMonitorStateException success) {
1215	+	} catch (Exception ex) {
1216	+	unexpectedException();
1217	+	}
1218	+	}
1219	+
1220	+
1221	+	/**
1222	+	* getWaitingThreads throws IAE if not owned
1223	+	*/
1224	+	public void testGetWaitingThreadsIAE() {
1225	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1226	+	final Condition c = (lock.writeLock().newCondition());
1227	+	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1228	+	try {
1229	+	lock2.getWaitingThreads(c);
1230	+	shouldThrow();
1231	+	} catch (IllegalArgumentException success) {
1232	+	} catch (Exception ex) {
1233	+	unexpectedException();
1234	+	}
1235	+	}
1236	+
1237	+	/**
1238	+	* getWaitingThreads throws IMSE if not locked
1239	+	*/
1240	+	public void testGetWaitingThreadsIMSE() {
1241	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1242	+	final Condition c = (lock.writeLock().newCondition());
1243	+	try {
1244	+	lock.getWaitingThreads(c);
1245	+	shouldThrow();
1246	+	} catch (IllegalMonitorStateException success) {
1247	+	} catch (Exception ex) {
1248	+	unexpectedException();
1249	+	}
1250	+	}
1251	+
1252	+
1253	+	/**
1254	+	* hasWaiters returns true when a thread is waiting, else false
1255	+	*/
1256	+	public void testHasWaiters() {
1257	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1258	+	final Condition c = (lock.writeLock().newCondition());
1259	+	Thread t = new Thread(new Runnable() {
1260	+	public void run() {
1261	+	try {
1262	+	lock.writeLock().lock();
1263	+	threadAssertFalse(lock.hasWaiters(c));
1264	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1265	+	c.await();
1266	+	lock.writeLock().unlock();
1267	+	}
1268	+	catch(InterruptedException e) {
1269	+	threadUnexpectedException();
1270	+	}
1271	+	}
1272	+	});
1273	+
1274	+	try {
1275	+	t.start();
1276	+	Thread.sleep(SHORT_DELAY_MS);
1277	+	lock.writeLock().lock();
1278	+	assertTrue(lock.hasWaiters(c));
1279	+	assertEquals(1, lock.getWaitQueueLength(c));
1280	+	c.signal();
1281	+	lock.writeLock().unlock();
1282	+	Thread.sleep(SHORT_DELAY_MS);
1283	+	lock.writeLock().lock();
1284	+	assertFalse(lock.hasWaiters(c));
1285	+	assertEquals(0, lock.getWaitQueueLength(c));
1286	+	lock.writeLock().unlock();
1287	+	t.join(SHORT_DELAY_MS);
1288	+	assertFalse(t.isAlive());
1289	+	}
1290	+	catch (Exception ex) {
1291	+	unexpectedException();
1292	+	}
1293	+	}
1294	+
1295	+	/**
1296	+	* getWaitQueueLength returns number of waiting threads
1297	+	*/
1298	+	public void testGetWaitQueueLength() {
1299	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1300	+	final Condition c = (lock.writeLock().newCondition());
1301	+	Thread t = new Thread(new Runnable() {
1302	+	public void run() {
1303	+	try {
1304	+	lock.writeLock().lock();
1305	+	threadAssertFalse(lock.hasWaiters(c));
1306	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1307	+	c.await();
1308	+	lock.writeLock().unlock();
1309	+	}
1310	+	catch(InterruptedException e) {
1311	+	threadUnexpectedException();
1312	+	}
1313	+	}
1314	+	});
1315	+
1316	+	try {
1317	+	t.start();
1318	+	Thread.sleep(SHORT_DELAY_MS);
1319	+	lock.writeLock().lock();
1320	+	assertTrue(lock.hasWaiters(c));
1321	+	assertEquals(1, lock.getWaitQueueLength(c));
1322	+	c.signal();
1323	+	lock.writeLock().unlock();
1324	+	Thread.sleep(SHORT_DELAY_MS);
1325	+	lock.writeLock().lock();
1326	+	assertFalse(lock.hasWaiters(c));
1327	+	assertEquals(0, lock.getWaitQueueLength(c));
1328	+	lock.writeLock().unlock();
1329	+	t.join(SHORT_DELAY_MS);
1330	+	assertFalse(t.isAlive());
1331	+	}
1332	+	catch (Exception ex) {
1333	+	unexpectedException();
1334	+	}
1335	+	}
1336	+
1337	+
1338	+	/**
1339	+	* getWaitingThreads returns only and all waiting threads
1340	+	*/
1341	+	public void testGetWaitingThreads() {
1342	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1343	+	final Condition c = lock.writeLock().newCondition();
1344	+	Thread t1 = new Thread(new Runnable() {
1345	+	public void run() {
1346	+	try {
1347	+	lock.writeLock().lock();
1348	+	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1349	+	c.await();
1350	+	lock.writeLock().unlock();
1351	+	}
1352	+	catch(InterruptedException e) {
1353	+	threadUnexpectedException();
1354	+	}
1355	+	}
1356	+	});
1357	+
1358	+	Thread t2 = new Thread(new Runnable() {
1359	+	public void run() {
1360	+	try {
1361	+	lock.writeLock().lock();
1362	+	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1363	+	c.await();
1364	+	lock.writeLock().unlock();
1365	+	}
1366	+	catch(InterruptedException e) {
1367	+	threadUnexpectedException();
1368	+	}
1369	+	}
1370	+	});
1371	+
1372	+	try {
1373	+	lock.writeLock().lock();
1374	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1375	+	lock.writeLock().unlock();
1376	+	t1.start();
1377	+	Thread.sleep(SHORT_DELAY_MS);
1378	+	t2.start();
1379	+	Thread.sleep(SHORT_DELAY_MS);
1380	+	lock.writeLock().lock();
1381	+	assertTrue(lock.hasWaiters(c));
1382	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1383	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1384	+	c.signalAll();
1385	+	lock.writeLock().unlock();
1386	+	Thread.sleep(SHORT_DELAY_MS);
1387	+	lock.writeLock().lock();
1388	+	assertFalse(lock.hasWaiters(c));
1389	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1390	+	lock.writeLock().unlock();
1391	+	t1.join(SHORT_DELAY_MS);
1392	+	t2.join(SHORT_DELAY_MS);
1393	+	assertFalse(t1.isAlive());
1394	+	assertFalse(t2.isAlive());
1395	+	}
1396	+	catch (Exception ex) {
1397	+	unexpectedException();
1398	+	}
1399	+	}
1400	+
1401	+	/**
1402	+	* toString indicates current lock state
1403	+	*/
1404	+	public void testToString() {
1405	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1406	+	String us = lock.toString();
1407	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1408	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1409	+	lock.writeLock().lock();
1410	+	String ws = lock.toString();
1411	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1412	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1413	+	lock.writeLock().unlock();
1414	+	lock.readLock().lock();
1415	+	lock.readLock().lock();
1416	+	String rs = lock.toString();
1417	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1418	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1419	+	}
1420	+
1421	+	/**
1422	+	* readLock.toString indicates current lock state
1423	+	*/
1424	+	public void testReadLockToString() {
1425	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1426	+	String us = lock.readLock().toString();
1427	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1428	+	lock.readLock().lock();
1429	+	lock.readLock().lock();
1430	+	String rs = lock.readLock().toString();
1431	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1432	+	}
1433	+
1434	+	/**
1435	+	* writeLock.toString indicates current lock state
1436	+	*/
1437	+	public void testWriteLockToString() {
1438	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1439	+	String us = lock.writeLock().toString();
1440	+	assertTrue(us.indexOf("Unlocked") >= 0);
1441	+	lock.writeLock().lock();
1442	+	String ls = lock.writeLock().toString();
1443	+	assertTrue(ls.indexOf("Locked") >= 0);
1444	+	}
1445
1446		}

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