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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 1.19 by dl, Sun Jan 25 13:25:28 2004 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	+	/**
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	<	/*
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 281 | Line 378 | public class ReentrantReadWriteLockTest
378
379
380		/**
381	<	* Read trylock succeeds if readlocked but not writelocked
381	>	* Read tryLock succeeds if readlocked but not writelocked
382		*/
383		public void testTryLockWhenReadLocked() {
384		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 304 | Line 401 | public class ReentrantReadWriteLockTest
401
402
403		/**
404	<	* write trylock fails when readlocked
404	>	* write tryLock fails when readlocked
405		*/
406		public void testWriteTryLockWhenReadLocked() {
407		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 326 | Line 423 | public class ReentrantReadWriteLockTest
423
424
425		/**
426	<	* write timed trylock times out if locked
426	>	* write timed tryLock times out if locked
427		*/
428		public void testWriteTryLock_Timeout() {
429		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 350 | Line 447 | public class ReentrantReadWriteLockTest
447		}
448
449		/**
450	<	* read timed trylock times out if write-locked
450	>	* read timed tryLock times out if write-locked
451		*/
452		public void testReadTryLock_Timeout() {
453		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 750 | Line 847 | public class ReentrantReadWriteLockTest
847		}
848		}
849
850	+	/**
851	+	* hasQueuedThreads reports whether there are waiting threads
852	+	*/
853	+	public void testhasQueuedThreads() {
854	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
855	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
856	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
857	+	try {
858	+	assertFalse(lock.hasQueuedThreads());
859	+	lock.writeLock().lock();
860	+	t1.start();
861	+	Thread.sleep(SHORT_DELAY_MS);
862	+	assertTrue(lock.hasQueuedThreads());
863	+	t2.start();
864	+	Thread.sleep(SHORT_DELAY_MS);
865	+	assertTrue(lock.hasQueuedThreads());
866	+	t1.interrupt();
867	+	Thread.sleep(SHORT_DELAY_MS);
868	+	assertTrue(lock.hasQueuedThreads());
869	+	lock.writeLock().unlock();
870	+	Thread.sleep(SHORT_DELAY_MS);
871	+	assertFalse(lock.hasQueuedThreads());
872	+	t1.join();
873	+	t2.join();
874	+	} catch(Exception e){
875	+	unexpectedException();
876	+	}
877	+	}
878	+
879	+	/**
880	+	* hasQueuedThread(null) throws NPE
881	+	*/
882	+	public void testHasQueuedThreadNPE() {
883	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
884	+	try {
885	+	sync.hasQueuedThread(null);
886	+	shouldThrow();
887	+	} catch (NullPointerException success) {
888	+	}
889	+	}
890	+
891	+	/**
892	+	* hasQueuedThread reports whether a thread is queued.
893	+	*/
894	+	public void testHasQueuedThread() {
895	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
896	+	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
897	+	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
898	+	try {
899	+	assertFalse(sync.hasQueuedThread(t1));
900	+	assertFalse(sync.hasQueuedThread(t2));
901	+	sync.writeLock().lock();
902	+	t1.start();
903	+	Thread.sleep(SHORT_DELAY_MS);
904	+	assertTrue(sync.hasQueuedThread(t1));
905	+	t2.start();
906	+	Thread.sleep(SHORT_DELAY_MS);
907	+	assertTrue(sync.hasQueuedThread(t1));
908	+	assertTrue(sync.hasQueuedThread(t2));
909	+	t1.interrupt();
910	+	Thread.sleep(SHORT_DELAY_MS);
911	+	assertFalse(sync.hasQueuedThread(t1));
912	+	assertTrue(sync.hasQueuedThread(t2));
913	+	sync.writeLock().unlock();
914	+	Thread.sleep(SHORT_DELAY_MS);
915	+	assertFalse(sync.hasQueuedThread(t1));
916	+	Thread.sleep(SHORT_DELAY_MS);
917	+	assertFalse(sync.hasQueuedThread(t2));
918	+	t1.join();
919	+	t2.join();
920	+	} catch(Exception e){
921	+	unexpectedException();
922	+	}
923	+	}
924	+
925	+
926	+	/**
927	+	* getQueueLength reports number of waiting threads
928	+	*/
929	+	public void testGetQueueLength() {
930	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
931	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
932	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
933	+	try {
934	+	assertEquals(0, lock.getQueueLength());
935	+	lock.writeLock().lock();
936	+	t1.start();
937	+	Thread.sleep(SHORT_DELAY_MS);
938	+	assertEquals(1, lock.getQueueLength());
939	+	t2.start();
940	+	Thread.sleep(SHORT_DELAY_MS);
941	+	assertEquals(2, lock.getQueueLength());
942	+	t1.interrupt();
943	+	Thread.sleep(SHORT_DELAY_MS);
944	+	assertEquals(1, lock.getQueueLength());
945	+	lock.writeLock().unlock();
946	+	Thread.sleep(SHORT_DELAY_MS);
947	+	assertEquals(0, lock.getQueueLength());
948	+	t1.join();
949	+	t2.join();
950	+	} catch(Exception e){
951	+	unexpectedException();
952	+	}
953	+	}
954	+
955	+	/**
956	+	* getQueuedThreads includes waiting threads
957	+	*/
958	+	public void testGetQueuedThreads() {
959	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
960	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
961	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
962	+	try {
963	+	assertTrue(lock.getQueuedThreads().isEmpty());
964	+	lock.writeLock().lock();
965	+	assertTrue(lock.getQueuedThreads().isEmpty());
966	+	t1.start();
967	+	Thread.sleep(SHORT_DELAY_MS);
968	+	assertTrue(lock.getQueuedThreads().contains(t1));
969	+	t2.start();
970	+	Thread.sleep(SHORT_DELAY_MS);
971	+	assertTrue(lock.getQueuedThreads().contains(t1));
972	+	assertTrue(lock.getQueuedThreads().contains(t2));
973	+	t1.interrupt();
974	+	Thread.sleep(SHORT_DELAY_MS);
975	+	assertFalse(lock.getQueuedThreads().contains(t1));
976	+	assertTrue(lock.getQueuedThreads().contains(t2));
977	+	lock.writeLock().unlock();
978	+	Thread.sleep(SHORT_DELAY_MS);
979	+	assertTrue(lock.getQueuedThreads().isEmpty());
980	+	t1.join();
981	+	t2.join();
982	+	} catch(Exception e){
983	+	unexpectedException();
984	+	}
985	+	}
986	+
987	+	/**
988	+	* hasWaiters throws NPE if null
989	+	*/
990	+	public void testHasWaitersNPE() {
991	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
992	+	try {
993	+	lock.hasWaiters(null);
994	+	shouldThrow();
995	+	} catch (NullPointerException success) {
996	+	} catch (Exception ex) {
997	+	unexpectedException();
998	+	}
999	+	}
1000	+
1001	+	/**
1002	+	* getWaitQueueLength throws NPE if null
1003	+	*/
1004	+	public void testGetWaitQueueLengthNPE() {
1005	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1006	+	try {
1007	+	lock.getWaitQueueLength(null);
1008	+	shouldThrow();
1009	+	} catch (NullPointerException success) {
1010	+	} catch (Exception ex) {
1011	+	unexpectedException();
1012	+	}
1013	+	}
1014	+
1015	+
1016	+	/**
1017	+	* getWaitingThreads throws NPE if null
1018	+	*/
1019	+	public void testGetWaitingThreadsNPE() {
1020	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1021	+	try {
1022	+	lock.getWaitingThreads(null);
1023	+	shouldThrow();
1024	+	} catch (NullPointerException success) {
1025	+	} catch (Exception ex) {
1026	+	unexpectedException();
1027	+	}
1028	+	}
1029	+
1030	+	/**
1031	+	* hasWaiters throws IAE if not owned
1032	+	*/
1033	+	public void testHasWaitersIAE() {
1034	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1035	+	final Condition c = (lock.writeLock().newCondition());
1036	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1037	+	try {
1038	+	lock2.hasWaiters(c);
1039	+	shouldThrow();
1040	+	} catch (IllegalArgumentException success) {
1041	+	} catch (Exception ex) {
1042	+	unexpectedException();
1043	+	}
1044	+	}
1045	+
1046	+	/**
1047	+	* hasWaiters throws IMSE if not locked
1048	+	*/
1049	+	public void testHasWaitersIMSE() {
1050	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1051	+	final Condition c = (lock.writeLock().newCondition());
1052	+	try {
1053	+	lock.hasWaiters(c);
1054	+	shouldThrow();
1055	+	} catch (IllegalMonitorStateException success) {
1056	+	} catch (Exception ex) {
1057	+	unexpectedException();
1058	+	}
1059	+	}
1060	+
1061	+
1062	+	/**
1063	+	* getWaitQueueLength throws IAE if not owned
1064	+	*/
1065	+	public void testGetWaitQueueLengthIAE() {
1066	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1067	+	final Condition c = (lock.writeLock().newCondition());
1068	+	final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock();
1069	+	try {
1070	+	lock2.getWaitQueueLength(c);
1071	+	shouldThrow();
1072	+	} catch (IllegalArgumentException success) {
1073	+	} catch (Exception ex) {
1074	+	unexpectedException();
1075	+	}
1076	+	}
1077	+
1078	+	/**
1079	+	* getWaitQueueLength throws IMSE if not locked
1080	+	*/
1081	+	public void testGetWaitQueueLengthIMSE() {
1082	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1083	+	final Condition c = (lock.writeLock().newCondition());
1084	+	try {
1085	+	lock.getWaitQueueLength(c);
1086	+	shouldThrow();
1087	+	} catch (IllegalMonitorStateException success) {
1088	+	} catch (Exception ex) {
1089	+	unexpectedException();
1090	+	}
1091	+	}
1092	+
1093	+
1094	+	/**
1095	+	* getWaitingThreads throws IAE if not owned
1096	+	*/
1097	+	public void testGetWaitingThreadsIAE() {
1098	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1099	+	final Condition c = (lock.writeLock().newCondition());
1100	+	final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock();
1101	+	try {
1102	+	lock2.getWaitingThreads(c);
1103	+	shouldThrow();
1104	+	} catch (IllegalArgumentException success) {
1105	+	} catch (Exception ex) {
1106	+	unexpectedException();
1107	+	}
1108	+	}
1109	+
1110	+	/**
1111	+	* getWaitingThreads throws IMSE if not locked
1112	+	*/
1113	+	public void testGetWaitingThreadsIMSE() {
1114	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1115	+	final Condition c = (lock.writeLock().newCondition());
1116	+	try {
1117	+	lock.getWaitingThreads(c);
1118	+	shouldThrow();
1119	+	} catch (IllegalMonitorStateException success) {
1120	+	} catch (Exception ex) {
1121	+	unexpectedException();
1122	+	}
1123	+	}
1124	+
1125	+
1126	+	/**
1127	+	* hasWaiters returns true when a thread is waiting, else false
1128	+	*/
1129	+	public void testHasWaiters() {
1130	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1131	+	final Condition c = (lock.writeLock().newCondition());
1132	+	Thread t = new Thread(new Runnable() {
1133	+	public void run() {
1134	+	try {
1135	+	lock.writeLock().lock();
1136	+	threadAssertFalse(lock.hasWaiters(c));
1137	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1138	+	c.await();
1139	+	lock.writeLock().unlock();
1140	+	}
1141	+	catch(InterruptedException e) {
1142	+	threadUnexpectedException();
1143	+	}
1144	+	}
1145	+	});
1146	+
1147	+	try {
1148	+	t.start();
1149	+	Thread.sleep(SHORT_DELAY_MS);
1150	+	lock.writeLock().lock();
1151	+	assertTrue(lock.hasWaiters(c));
1152	+	assertEquals(1, lock.getWaitQueueLength(c));
1153	+	c.signal();
1154	+	lock.writeLock().unlock();
1155	+	Thread.sleep(SHORT_DELAY_MS);
1156	+	lock.writeLock().lock();
1157	+	assertFalse(lock.hasWaiters(c));
1158	+	assertEquals(0, lock.getWaitQueueLength(c));
1159	+	lock.writeLock().unlock();
1160	+	t.join(SHORT_DELAY_MS);
1161	+	assertFalse(t.isAlive());
1162	+	}
1163	+	catch (Exception ex) {
1164	+	unexpectedException();
1165	+	}
1166	+	}
1167	+
1168	+	/**
1169	+	* getWaitQueueLength returns number of waiting threads
1170	+	*/
1171	+	public void testGetWaitQueueLength() {
1172	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1173	+	final Condition c = (lock.writeLock().newCondition());
1174	+	Thread t = new Thread(new Runnable() {
1175	+	public void run() {
1176	+	try {
1177	+	lock.writeLock().lock();
1178	+	threadAssertFalse(lock.hasWaiters(c));
1179	+	threadAssertEquals(0, lock.getWaitQueueLength(c));
1180	+	c.await();
1181	+	lock.writeLock().unlock();
1182	+	}
1183	+	catch(InterruptedException e) {
1184	+	threadUnexpectedException();
1185	+	}
1186	+	}
1187	+	});
1188	+
1189	+	try {
1190	+	t.start();
1191	+	Thread.sleep(SHORT_DELAY_MS);
1192	+	lock.writeLock().lock();
1193	+	assertTrue(lock.hasWaiters(c));
1194	+	assertEquals(1, lock.getWaitQueueLength(c));
1195	+	c.signal();
1196	+	lock.writeLock().unlock();
1197	+	Thread.sleep(SHORT_DELAY_MS);
1198	+	lock.writeLock().lock();
1199	+	assertFalse(lock.hasWaiters(c));
1200	+	assertEquals(0, lock.getWaitQueueLength(c));
1201	+	lock.writeLock().unlock();
1202	+	t.join(SHORT_DELAY_MS);
1203	+	assertFalse(t.isAlive());
1204	+	}
1205	+	catch (Exception ex) {
1206	+	unexpectedException();
1207	+	}
1208	+	}
1209	+
1210	+
1211	+	/**
1212	+	* getWaitingThreads returns only and all waiting threads
1213	+	*/
1214	+	public void testGetWaitingThreads() {
1215	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1216	+	final Condition c = lock.writeLock().newCondition();
1217	+	Thread t1 = new Thread(new Runnable() {
1218	+	public void run() {
1219	+	try {
1220	+	lock.writeLock().lock();
1221	+	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1222	+	c.await();
1223	+	lock.writeLock().unlock();
1224	+	}
1225	+	catch(InterruptedException e) {
1226	+	threadUnexpectedException();
1227	+	}
1228	+	}
1229	+	});
1230	+
1231	+	Thread t2 = new Thread(new Runnable() {
1232	+	public void run() {
1233	+	try {
1234	+	lock.writeLock().lock();
1235	+	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1236	+	c.await();
1237	+	lock.writeLock().unlock();
1238	+	}
1239	+	catch(InterruptedException e) {
1240	+	threadUnexpectedException();
1241	+	}
1242	+	}
1243	+	});
1244	+
1245	+	try {
1246	+	lock.writeLock().lock();
1247	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1248	+	lock.writeLock().unlock();
1249	+	t1.start();
1250	+	Thread.sleep(SHORT_DELAY_MS);
1251	+	t2.start();
1252	+	Thread.sleep(SHORT_DELAY_MS);
1253	+	lock.writeLock().lock();
1254	+	assertTrue(lock.hasWaiters(c));
1255	+	assertTrue(lock.getWaitingThreads(c).contains(t1));
1256	+	assertTrue(lock.getWaitingThreads(c).contains(t2));
1257	+	c.signalAll();
1258	+	lock.writeLock().unlock();
1259	+	Thread.sleep(SHORT_DELAY_MS);
1260	+	lock.writeLock().lock();
1261	+	assertFalse(lock.hasWaiters(c));
1262	+	assertTrue(lock.getWaitingThreads(c).isEmpty());
1263	+	lock.writeLock().unlock();
1264	+	t1.join(SHORT_DELAY_MS);
1265	+	t2.join(SHORT_DELAY_MS);
1266	+	assertFalse(t1.isAlive());
1267	+	assertFalse(t2.isAlive());
1268	+	}
1269	+	catch (Exception ex) {
1270	+	unexpectedException();
1271	+	}
1272	+	}
1273	+
1274	+	/**
1275	+	* toString indicates current lock state
1276	+	*/
1277	+	public void testToString() {
1278	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1279	+	String us = lock.toString();
1280	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1281	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1282	+	lock.writeLock().lock();
1283	+	String ws = lock.toString();
1284	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1285	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1286	+	lock.writeLock().unlock();
1287	+	lock.readLock().lock();
1288	+	lock.readLock().lock();
1289	+	String rs = lock.toString();
1290	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1291	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1292	+	}
1293	+
1294	+	/**
1295	+	* readLock.toString indicates current lock state
1296	+	*/
1297	+	public void testReadLockToString() {
1298	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1299	+	String us = lock.readLock().toString();
1300	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1301	+	lock.readLock().lock();
1302	+	lock.readLock().lock();
1303	+	String rs = lock.readLock().toString();
1304	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1305	+	}
1306	+
1307	+	/**
1308	+	* writeLock.toString indicates current lock state
1309	+	*/
1310	+	public void testWriteLockToString() {
1311	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1312	+	String us = lock.writeLock().toString();
1313	+	assertTrue(us.indexOf("Unlocked") >= 0);
1314	+	lock.writeLock().lock();
1315	+	String ls = lock.writeLock().toString();
1316	+	assertTrue(ls.indexOf("Locked") >= 0);
1317	+	}
1318
1319		}

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