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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.12 by dl, Sat Dec 27 19:26:43 2003 UTC vs.
Revision 1.21 by dl, Thu Jan 20 00:39:13 2005 UTC

#	Line 57 | Line 57 | public class ReentrantReadWriteLockTest
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		/**
#	Line 153 | Line 156 | public class ReentrantReadWriteLockTest
156		*/
157		public void testWriteLockInterruptibly_Interrupted() {
158		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
156	–	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 173 | 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 182 | Line 187 | public class ReentrantReadWriteLockTest
187		public void run() {
188		try {
189		lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
185	–	threadShouldThrow();
190		} catch(InterruptedException success){}
191		}
192		});
#	Line 206 | Line 210 | public class ReentrantReadWriteLockTest
210		public void run() {
211		try {
212		lock.readLock().lockInterruptibly();
209	–	threadShouldThrow();
213		} catch(InterruptedException success){}
214		}
215		});
#	Line 221 | 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 245 | 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 265 | 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 373 | 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	<	* Read trylock succeeds if readlocked but not writelocked
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 398 | 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 420 | 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 444 | 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 588 | Line 691 | public class ReentrantReadWriteLockTest
691		final Condition c = lock.writeLock().newCondition();
692		try {
693		lock.writeLock().lock();
591	–	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
694		lock.writeLock().unlock();
695		}
696		catch (Exception ex) {
#	Line 605 | Line 707 | public class ReentrantReadWriteLockTest
707		try {
708		lock.writeLock().lock();
709		java.util.Date d = new java.util.Date();
608	–	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
710		lock.writeLock().unlock();
711		}
712		catch (Exception ex) {
#	Line 845 | Line 946 | public class ReentrantReadWriteLockTest
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() {
#	Line 906 | Line 1083 | public class ReentrantReadWriteLockTest
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 AbstractQueuedSynchronizer.ConditionObject c = (lock.writeLock().newCondition());
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(c.hasWaiters());
1235	<	threadAssertEquals(0, c.getWaitQueueLength());
1234	>	threadAssertFalse(lock.hasWaiters(c));
1235	>	threadAssertEquals(0, lock.getWaitQueueLength(c));
1236		c.await();
1237		lock.writeLock().unlock();
1238		}
#	Line 930 | Line 1246 | public class ReentrantReadWriteLockTest
1246		t.start();
1247		Thread.sleep(SHORT_DELAY_MS);
1248		lock.writeLock().lock();
1249	<	assertTrue(c.hasWaiters());
1250	<	assertEquals(1, c.getWaitQueueLength());
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(c.hasWaiters());
1256	<	assertEquals(0, c.getWaitQueueLength());
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());
#	Line 951 | Line 1267 | public class ReentrantReadWriteLockTest
1267		* getWaitQueueLength returns number of waiting threads
1268		*/
1269		public void testGetWaitQueueLength() {
1270	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1271	<	final AbstractQueuedSynchronizer.ConditionObject c = (lock.writeLock().newCondition());
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	<	threadAssertFalse(c.hasWaiters());
961	<	threadAssertEquals(0, c.getWaitQueueLength());
1319	>	threadAssertTrue(lock.getWaitingThreads(c).isEmpty());
1320		c.await();
1321		lock.writeLock().unlock();
1322		}
#	Line 972 | Line 1330 | public class ReentrantReadWriteLockTest
1330		public void run() {
1331		try {
1332		lock.writeLock().lock();
1333	<	threadAssertTrue(c.hasWaiters());
976	<	threadAssertEquals(1, c.getWaitQueueLength());
1333	>	threadAssertFalse(lock.getWaitingThreads(c).isEmpty());
1334		c.await();
1335		lock.writeLock().unlock();
1336		}
#	Line 984 | Line 1341 | public class ReentrantReadWriteLockTest
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(c.hasWaiters());
1353	<	assertEquals(2, c.getWaitQueueLength());
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(c.hasWaiters());
1360	<	assertEquals(0, c.getWaitQueueLength());
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);
#	Line 1007 | Line 1368 | public class ReentrantReadWriteLockTest
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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