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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 1.21 by dl, Thu Jan 20 00:39:13 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	<	/*
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	>	/**
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 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
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 750 | Line 945 | public class ReentrantReadWriteLockTest
945		}
946		}
947
948	+	/**
949	+	* hasQueuedThreads reports whether there are waiting threads
950	+	*/
951	+	public void testhasQueuedThreads() {
952	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
953	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
954	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
955	+	try {
956	+	assertFalse(lock.hasQueuedThreads());
957	+	lock.writeLock().lock();
958	+	t1.start();
959	+	Thread.sleep(SHORT_DELAY_MS);
960	+	assertTrue(lock.hasQueuedThreads());
961	+	t2.start();
962	+	Thread.sleep(SHORT_DELAY_MS);
963	+	assertTrue(lock.hasQueuedThreads());
964	+	t1.interrupt();
965	+	Thread.sleep(SHORT_DELAY_MS);
966	+	assertTrue(lock.hasQueuedThreads());
967	+	lock.writeLock().unlock();
968	+	Thread.sleep(SHORT_DELAY_MS);
969	+	assertFalse(lock.hasQueuedThreads());
970	+	t1.join();
971	+	t2.join();
972	+	} catch(Exception e){
973	+	unexpectedException();
974	+	}
975	+	}
976	+
977	+	/**
978	+	* hasQueuedThread(null) throws NPE
979	+	*/
980	+	public void testHasQueuedThreadNPE() {
981	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
982	+	try {
983	+	sync.hasQueuedThread(null);
984	+	shouldThrow();
985	+	} catch (NullPointerException success) {
986	+	}
987	+	}
988	+
989	+	/**
990	+	* hasQueuedThread reports whether a thread is queued.
991	+	*/
992	+	public void testHasQueuedThread() {
993	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
994	+	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
995	+	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
996	+	try {
997	+	assertFalse(sync.hasQueuedThread(t1));
998	+	assertFalse(sync.hasQueuedThread(t2));
999	+	sync.writeLock().lock();
1000	+	t1.start();
1001	+	Thread.sleep(SHORT_DELAY_MS);
1002	+	assertTrue(sync.hasQueuedThread(t1));
1003	+	t2.start();
1004	+	Thread.sleep(SHORT_DELAY_MS);
1005	+	assertTrue(sync.hasQueuedThread(t1));
1006	+	assertTrue(sync.hasQueuedThread(t2));
1007	+	t1.interrupt();
1008	+	Thread.sleep(SHORT_DELAY_MS);
1009	+	assertFalse(sync.hasQueuedThread(t1));
1010	+	assertTrue(sync.hasQueuedThread(t2));
1011	+	sync.writeLock().unlock();
1012	+	Thread.sleep(SHORT_DELAY_MS);
1013	+	assertFalse(sync.hasQueuedThread(t1));
1014	+	Thread.sleep(SHORT_DELAY_MS);
1015	+	assertFalse(sync.hasQueuedThread(t2));
1016	+	t1.join();
1017	+	t2.join();
1018	+	} catch(Exception e){
1019	+	unexpectedException();
1020	+	}
1021	+	}
1022	+
1023	+
1024	+	/**
1025	+	* getQueueLength reports number of waiting threads
1026	+	*/
1027	+	public void testGetQueueLength() {
1028	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1029	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1030	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1031	+	try {
1032	+	assertEquals(0, lock.getQueueLength());
1033	+	lock.writeLock().lock();
1034	+	t1.start();
1035	+	Thread.sleep(SHORT_DELAY_MS);
1036	+	assertEquals(1, lock.getQueueLength());
1037	+	t2.start();
1038	+	Thread.sleep(SHORT_DELAY_MS);
1039	+	assertEquals(2, lock.getQueueLength());
1040	+	t1.interrupt();
1041	+	Thread.sleep(SHORT_DELAY_MS);
1042	+	assertEquals(1, lock.getQueueLength());
1043	+	lock.writeLock().unlock();
1044	+	Thread.sleep(SHORT_DELAY_MS);
1045	+	assertEquals(0, lock.getQueueLength());
1046	+	t1.join();
1047	+	t2.join();
1048	+	} catch(Exception e){
1049	+	unexpectedException();
1050	+	}
1051	+	}
1052	+
1053	+	/**
1054	+	* getQueuedThreads includes waiting threads
1055	+	*/
1056	+	public void testGetQueuedThreads() {
1057	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1058	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1059	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1060	+	try {
1061	+	assertTrue(lock.getQueuedThreads().isEmpty());
1062	+	lock.writeLock().lock();
1063	+	assertTrue(lock.getQueuedThreads().isEmpty());
1064	+	t1.start();
1065	+	Thread.sleep(SHORT_DELAY_MS);
1066	+	assertTrue(lock.getQueuedThreads().contains(t1));
1067	+	t2.start();
1068	+	Thread.sleep(SHORT_DELAY_MS);
1069	+	assertTrue(lock.getQueuedThreads().contains(t1));
1070	+	assertTrue(lock.getQueuedThreads().contains(t2));
1071	+	t1.interrupt();
1072	+	Thread.sleep(SHORT_DELAY_MS);
1073	+	assertFalse(lock.getQueuedThreads().contains(t1));
1074	+	assertTrue(lock.getQueuedThreads().contains(t2));
1075	+	lock.writeLock().unlock();
1076	+	Thread.sleep(SHORT_DELAY_MS);
1077	+	assertTrue(lock.getQueuedThreads().isEmpty());
1078	+	t1.join();
1079	+	t2.join();
1080	+	} catch(Exception e){
1081	+	unexpectedException();
1082	+	}
1083	+	}
1084	+
1085	+	/**
1086	+	* hasWaiters throws NPE if null
1087	+	*/
1088	+	public void testHasWaitersNPE() {
1089	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1090	+	try {
1091	+	lock.hasWaiters(null);
1092	+	shouldThrow();
1093	+	} catch (NullPointerException success) {
1094	+	} catch (Exception ex) {
1095	+	unexpectedException();
1096	+	}
1097	+	}
1098	+
1099	+	/**
1100	+	* getWaitQueueLength throws NPE if null
1101	+	*/
1102	+	public void testGetWaitQueueLengthNPE() {
1103	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1104	+	try {
1105	+	lock.getWaitQueueLength(null);
1106	+	shouldThrow();
1107	+	} catch (NullPointerException success) {
1108	+	} catch (Exception ex) {
1109	+	unexpectedException();
1110	+	}
1111	+	}
1112	+
1113	+
1114	+	/**
1115	+	* getWaitingThreads throws NPE if null
1116	+	*/
1117	+	public void testGetWaitingThreadsNPE() {
1118	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1119	+	try {
1120	+	lock.getWaitingThreads(null);
1121	+	shouldThrow();
1122	+	} catch (NullPointerException success) {
1123	+	} catch (Exception ex) {
1124	+	unexpectedException();
1125	+	}
1126	+	}
1127	+
1128	+	/**
1129	+	* hasWaiters throws IAE if not owned
1130	+	*/
1131	+	public void testHasWaitersIAE() {
1132	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1133	+	final Condition c = (lock.writeLock().newCondition());
1134	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1135	+	try {
1136	+	lock2.hasWaiters(c);
1137	+	shouldThrow();
1138	+	} catch (IllegalArgumentException success) {
1139	+	} catch (Exception ex) {
1140	+	unexpectedException();
1141	+	}
1142	+	}
1143	+
1144	+	/**
1145	+	* hasWaiters throws IMSE if not locked
1146	+	*/
1147	+	public void testHasWaitersIMSE() {
1148	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1149	+	final Condition c = (lock.writeLock().newCondition());
1150	+	try {
1151	+	lock.hasWaiters(c);
1152	+	shouldThrow();
1153	+	} catch (IllegalMonitorStateException success) {
1154	+	} catch (Exception ex) {
1155	+	unexpectedException();
1156	+	}
1157	+	}
1158	+
1159	+
1160	+	/**
1161	+	* getWaitQueueLength throws IAE if not owned
1162	+	*/
1163	+	public void testGetWaitQueueLengthIAE() {
1164	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1165	+	final Condition c = (lock.writeLock().newCondition());
1166	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1167	+	try {
1168	+	lock2.getWaitQueueLength(c);
1169	+	shouldThrow();
1170	+	} catch (IllegalArgumentException success) {
1171	+	} catch (Exception ex) {
1172	+	unexpectedException();
1173	+	}
1174	+	}
1175	+
1176	+	/**
1177	+	* getWaitQueueLength throws IMSE if not locked
1178	+	*/
1179	+	public void testGetWaitQueueLengthIMSE() {
1180	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1181	+	final Condition c = (lock.writeLock().newCondition());
1182	+	try {
1183	+	lock.getWaitQueueLength(c);
1184	+	shouldThrow();
1185	+	} catch (IllegalMonitorStateException success) {
1186	+	} catch (Exception ex) {
1187	+	unexpectedException();
1188	+	}
1189	+	}
1190	+
1191	+
1192	+	/**
1193	+	* getWaitingThreads throws IAE if not owned
1194	+	*/
1195	+	public void testGetWaitingThreadsIAE() {
1196	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1197	+	final Condition c = (lock.writeLock().newCondition());
1198	+	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1199	+	try {
1200	+	lock2.getWaitingThreads(c);
1201	+	shouldThrow();
1202	+	} catch (IllegalArgumentException success) {
1203	+	} catch (Exception ex) {
1204	+	unexpectedException();
1205	+	}
1206	+	}
1207	+
1208	+	/**
1209	+	* getWaitingThreads throws IMSE if not locked
1210	+	*/
1211	+	public void testGetWaitingThreadsIMSE() {
1212	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1213	+	final Condition c = (lock.writeLock().newCondition());
1214	+	try {
1215	+	lock.getWaitingThreads(c);
1216	+	shouldThrow();
1217	+	} catch (IllegalMonitorStateException success) {
1218	+	} catch (Exception ex) {
1219	+	unexpectedException();
1220	+	}
1221	+	}
1222	+
1223	+
1224	+	/**
1225	+	* hasWaiters returns true when a thread is waiting, else false
1226	+	*/
1227	+	public void testHasWaiters() {
1228	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1229	+	final Condition c = (lock.writeLock().newCondition());
1230	+	Thread t = new Thread(new Runnable() {
1231	+	public void run() {
1232	+	try {
1233	+	lock.writeLock().lock();
1234	+	threadAssertFalse(lock.hasWaiters(c));
1235	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1236	+	c.await();
1237	+	lock.writeLock().unlock();
1238	+	}
1239	+	catch(InterruptedException e) {
1240	+	threadUnexpectedException();
1241	+	}
1242	+	}
1243	+	});
1244	+
1245	+	try {
1246	+	t.start();
1247	+	Thread.sleep(SHORT_DELAY_MS);
1248	+	lock.writeLock().lock();
1249	+	assertTrue(lock.hasWaiters(c));
1250	+	assertEquals(1, lock.getWaitQueueLength(c));
1251	+	c.signal();
1252	+	lock.writeLock().unlock();
1253	+	Thread.sleep(SHORT_DELAY_MS);
1254	+	lock.writeLock().lock();
1255	+	assertFalse(lock.hasWaiters(c));
1256	+	assertEquals(0, lock.getWaitQueueLength(c));
1257	+	lock.writeLock().unlock();
1258	+	t.join(SHORT_DELAY_MS);
1259	+	assertFalse(t.isAlive());
1260	+	}
1261	+	catch (Exception ex) {
1262	+	unexpectedException();
1263	+	}
1264	+	}
1265	+
1266	+	/**
1267	+	* getWaitQueueLength returns number of waiting threads
1268	+	*/
1269	+	public void testGetWaitQueueLength() {
1270	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1271	+	final Condition c = (lock.writeLock().newCondition());
1272	+	Thread t = new Thread(new Runnable() {
1273	+	public void run() {
1274	+	try {
1275	+	lock.writeLock().lock();
1276	+	threadAssertFalse(lock.hasWaiters(c));
1277	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1278	+	c.await();
1279	+	lock.writeLock().unlock();
1280	+	}
1281	+	catch(InterruptedException e) {
1282	+	threadUnexpectedException();
1283	+	}
1284	+	}
1285	+	});
1286	+
1287	+	try {
1288	+	t.start();
1289	+	Thread.sleep(SHORT_DELAY_MS);
1290	+	lock.writeLock().lock();
1291	+	assertTrue(lock.hasWaiters(c));
1292	+	assertEquals(1, lock.getWaitQueueLength(c));
1293	+	c.signal();
1294	+	lock.writeLock().unlock();
1295	+	Thread.sleep(SHORT_DELAY_MS);
1296	+	lock.writeLock().lock();
1297	+	assertFalse(lock.hasWaiters(c));
1298	+	assertEquals(0, lock.getWaitQueueLength(c));
1299	+	lock.writeLock().unlock();
1300	+	t.join(SHORT_DELAY_MS);
1301	+	assertFalse(t.isAlive());
1302	+	}
1303	+	catch (Exception ex) {
1304	+	unexpectedException();
1305	+	}
1306	+	}
1307	+
1308	+
1309	+	/**
1310	+	* getWaitingThreads returns only and all waiting threads
1311	+	*/
1312	+	public void testGetWaitingThreads() {
1313	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1314	+	final Condition c = lock.writeLock().newCondition();
1315	+	Thread t1 = new Thread(new Runnable() {
1316	+	public void run() {
1317	+	try {
1318	+	lock.writeLock().lock();
1319	+	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1320	+	c.await();
1321	+	lock.writeLock().unlock();
1322	+	}
1323	+	catch(InterruptedException e) {
1324	+	threadUnexpectedException();
1325	+	}
1326	+	}
1327	+	});
1328	+
1329	+	Thread t2 = new Thread(new Runnable() {
1330	+	public void run() {
1331	+	try {
1332	+	lock.writeLock().lock();
1333	+	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1334	+	c.await();
1335	+	lock.writeLock().unlock();
1336	+	}
1337	+	catch(InterruptedException e) {
1338	+	threadUnexpectedException();
1339	+	}
1340	+	}
1341	+	});
1342	+
1343	+	try {
1344	+	lock.writeLock().lock();
1345	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1346	+	lock.writeLock().unlock();
1347	+	t1.start();
1348	+	Thread.sleep(SHORT_DELAY_MS);
1349	+	t2.start();
1350	+	Thread.sleep(SHORT_DELAY_MS);
1351	+	lock.writeLock().lock();
1352	+	assertTrue(lock.hasWaiters(c));
1353	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1354	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1355	+	c.signalAll();
1356	+	lock.writeLock().unlock();
1357	+	Thread.sleep(SHORT_DELAY_MS);
1358	+	lock.writeLock().lock();
1359	+	assertFalse(lock.hasWaiters(c));
1360	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1361	+	lock.writeLock().unlock();
1362	+	t1.join(SHORT_DELAY_MS);
1363	+	t2.join(SHORT_DELAY_MS);
1364	+	assertFalse(t1.isAlive());
1365	+	assertFalse(t2.isAlive());
1366	+	}
1367	+	catch (Exception ex) {
1368	+	unexpectedException();
1369	+	}
1370	+	}
1371	+
1372	+	/**
1373	+	* toString indicates current lock state
1374	+	*/
1375	+	public void testToString() {
1376	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1377	+	String us = lock.toString();
1378	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1379	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1380	+	lock.writeLock().lock();
1381	+	String ws = lock.toString();
1382	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1383	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1384	+	lock.writeLock().unlock();
1385	+	lock.readLock().lock();
1386	+	lock.readLock().lock();
1387	+	String rs = lock.toString();
1388	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1389	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1390	+	}
1391	+
1392	+	/**
1393	+	* readLock.toString indicates current lock state
1394	+	*/
1395	+	public void testReadLockToString() {
1396	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1397	+	String us = lock.readLock().toString();
1398	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1399	+	lock.readLock().lock();
1400	+	lock.readLock().lock();
1401	+	String rs = lock.readLock().toString();
1402	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1403	+	}
1404	+
1405	+	/**
1406	+	* writeLock.toString indicates current lock state
1407	+	*/
1408	+	public void testWriteLockToString() {
1409	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1410	+	String us = lock.writeLock().toString();
1411	+	assertTrue(us.indexOf("Unlocked") >= 0);
1412	+	lock.writeLock().lock();
1413	+	String ls = lock.writeLock().toString();
1414	+	assertTrue(ls.indexOf("Locked") >= 0);
1415	+	}
1416
1417		}

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