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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.13 by dl, Sun Dec 28 21:56:18 2003 UTC vs.
Revision 1.26 by dl, Fri Feb 24 00:03:16 2006 UTC

#	Line 84 | Line 84 | public class ReentrantReadWriteLockTest
84		rl.writeLock().lock();
85		assertTrue(rl.isWriteLocked());
86		assertTrue(rl.isWriteLockedByCurrentThread());
87	+	assertTrue(rl.writeLock().isHeldByCurrentThread());
88		assertEquals(0, rl.getReadLockCount());
89		rl.writeLock().unlock();
90		assertFalse(rl.isWriteLocked());
91		assertFalse(rl.isWriteLockedByCurrentThread());
92	+	assertFalse(rl.writeLock().isHeldByCurrentThread());
93		assertEquals(0, rl.getReadLockCount());
94		rl.readLock().lock();
95		assertFalse(rl.isWriteLocked());
#	Line 108 | Line 110 | public class ReentrantReadWriteLockTest
110		rl.writeLock().lock();
111		assertTrue(rl.isWriteLocked());
112		assertTrue(rl.isWriteLockedByCurrentThread());
113	+	assertTrue(rl.writeLock().isHeldByCurrentThread());
114		assertEquals(0, rl.getReadLockCount());
115		rl.writeLock().unlock();
116		assertFalse(rl.isWriteLocked());
117		assertFalse(rl.isWriteLockedByCurrentThread());
118	+	assertFalse(rl.writeLock().isHeldByCurrentThread());
119		assertEquals(0, rl.getReadLockCount());
120		rl.readLock().lock();
121		assertFalse(rl.isWriteLocked());
#	Line 126 | Line 130 | public class ReentrantReadWriteLockTest
130		/**
131		* getWriteHoldCount returns number of recursive holds
132		*/
133	<	public void testGetHoldCount() {
133	>	public void testGetWriteHoldCount() {
134		ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
135		for(int i = 1; i <= SIZE; i++) {
136		lock.writeLock().lock();
#	Line 137 | Line 141 | public class ReentrantReadWriteLockTest
141		assertEquals(i-1,lock.getWriteHoldCount());
142		}
143		}
144	+
145	+	/**
146	+	* WriteLock.getHoldCount returns number of recursive holds
147	+	*/
148	+	public void testGetHoldCount() {
149	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
150	+	for(int i = 1; i <= SIZE; i++) {
151	+	lock.writeLock().lock();
152	+	assertEquals(i,lock.writeLock().getHoldCount());
153	+	}
154	+	for(int i = SIZE; i > 0; i--) {
155	+	lock.writeLock().unlock();
156	+	assertEquals(i-1,lock.writeLock().getHoldCount());
157	+	}
158	+	}
159	+
160	+	/**
161	+	* getReadHoldCount returns number of recursive holds
162	+	*/
163	+	public void testGetReadHoldCount() {
164	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
165	+	for(int i = 1; i <= SIZE; i++) {
166	+	lock.readLock().lock();
167	+	assertEquals(i,lock.getReadHoldCount());
168	+	}
169	+	for(int i = SIZE; i > 0; i--) {
170	+	lock.readLock().unlock();
171	+	assertEquals(i-1,lock.getReadHoldCount());
172	+	}
173	+	}
174
175
176		/**
#	Line 156 | Line 190 | public class ReentrantReadWriteLockTest
190		*/
191		public void testWriteLockInterruptibly_Interrupted() {
192		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
159	–	lock.writeLock().lock();
193		Thread t = new Thread(new Runnable() {
194		public void run() {
195		try {
196		lock.writeLock().lockInterruptibly();
197	<	threadShouldThrow();
197	>	lock.writeLock().unlock();
198	>	lock.writeLock().lockInterruptibly();
199	>	lock.writeLock().unlock();
200		} catch(InterruptedException success){}
201		}
202		});
203		try {
204	+	lock.writeLock().lock();
205		t.start();
206	+	Thread.sleep(SHORT_DELAY_MS);
207		t.interrupt();
208		lock.writeLock().unlock();
209		t.join();
#	Line 176 | Line 213 | public class ReentrantReadWriteLockTest
213		}
214
215		/**
216	<	* timed write-trylock is interruptible
216	>	* timed write-tryLock is interruptible
217		*/
218		public void testWriteTryLock_Interrupted() {
219		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 185 | Line 222 | public class ReentrantReadWriteLockTest
222		public void run() {
223		try {
224		lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
188	–	threadShouldThrow();
225		} catch(InterruptedException success){}
226		}
227		});
#	Line 209 | Line 245 | public class ReentrantReadWriteLockTest
245		public void run() {
246		try {
247		lock.readLock().lockInterruptibly();
212	–	threadShouldThrow();
248		} catch(InterruptedException success){}
249		}
250		});
251		try {
252		t.start();
253	+	Thread.sleep(SHORT_DELAY_MS);
254		t.interrupt();
255		lock.writeLock().unlock();
256		t.join();
#	Line 224 | Line 260 | public class ReentrantReadWriteLockTest
260		}
261
262		/**
263	<	* timed read-trylock is interruptible
263	>	* timed read-tryLock is interruptible
264		*/
265		public void testReadTryLock_Interrupted() {
266		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 248 | Line 284 | public class ReentrantReadWriteLockTest
284
285
286		/**
287	<	* write-trylock fails if locked
287	>	* write-tryLock fails if locked
288		*/
289		public void testWriteTryLockWhenLocked() {
290		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 268 | Line 304 | public class ReentrantReadWriteLockTest
304		}
305
306		/**
307	<	* read-trylock fails if locked
307	>	* read-tryLock fails if locked
308		*/
309		public void testReadTryLockWhenLocked() {
310		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 376 | Line 412 | public class ReentrantReadWriteLockTest
412		}
413		}
414
415	+	/**
416	+	* Read trylock succeeds if write locked by current thread
417	+	*/
418	+	public void testReadHoldingWriteLock() {
419	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
420	+	lock.writeLock().lock();
421	+	assertTrue(lock.readLock().tryLock());
422	+	lock.readLock().unlock();
423	+	lock.writeLock().unlock();
424	+	}
425	+
426	+	/**
427	+	* Read lock succeeds if write locked by current thread even if
428	+	* other threads are waiting for readlock
429	+	*/
430	+	public void testReadHoldingWriteLock2() {
431	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
432	+	lock.writeLock().lock();
433	+	Thread t1 = new Thread(new Runnable() {
434	+	public void run() {
435	+	lock.readLock().lock();
436	+	lock.readLock().unlock();
437	+	}
438	+	});
439	+	Thread t2 = new Thread(new Runnable() {
440	+	public void run() {
441	+	lock.readLock().lock();
442	+	lock.readLock().unlock();
443	+	}
444	+	});
445	+
446	+	try {
447	+	t1.start();
448	+	t2.start();
449	+	lock.readLock().lock();
450	+	lock.readLock().unlock();
451	+	Thread.sleep(SHORT_DELAY_MS);
452	+	lock.readLock().lock();
453	+	lock.readLock().unlock();
454	+	lock.writeLock().unlock();
455	+	t1.join(MEDIUM_DELAY_MS);
456	+	t2.join(MEDIUM_DELAY_MS);
457	+	assertTrue(!t1.isAlive());
458	+	assertTrue(!t2.isAlive());
459	+
460	+	} catch(Exception e){
461	+	unexpectedException();
462	+	}
463	+	}
464
465		/**
466	<	* Read trylock succeeds if readlocked but not writelocked
466	>	*  Read lock succeeds if write locked by current thread even if
467	>	* other threads are waiting for writelock
468	>	*/
469	>	public void testReadHoldingWriteLock3() {
470	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
471	>	lock.writeLock().lock();
472	>	Thread t1 = new Thread(new Runnable() {
473	>	public void run() {
474	>	lock.writeLock().lock();
475	>	lock.writeLock().unlock();
476	>	}
477	>	});
478	>	Thread t2 = new Thread(new Runnable() {
479	>	public void run() {
480	>	lock.writeLock().lock();
481	>	lock.writeLock().unlock();
482	>	}
483	>	});
484	>
485	>	try {
486	>	t1.start();
487	>	t2.start();
488	>	lock.readLock().lock();
489	>	lock.readLock().unlock();
490	>	Thread.sleep(SHORT_DELAY_MS);
491	>	lock.readLock().lock();
492	>	lock.readLock().unlock();
493	>	lock.writeLock().unlock();
494	>	t1.join(MEDIUM_DELAY_MS);
495	>	t2.join(MEDIUM_DELAY_MS);
496	>	assertTrue(!t1.isAlive());
497	>	assertTrue(!t2.isAlive());
498	>
499	>	} catch(Exception e){
500	>	unexpectedException();
501	>	}
502	>	}
503	>
504	>
505	>	/**
506	>	*  Write lock succeeds if write locked by current thread even if
507	>	* other threads are waiting for writelock
508	>	*/
509	>	public void testWriteHoldingWriteLock4() {
510	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
511	>	lock.writeLock().lock();
512	>	Thread t1 = new Thread(new Runnable() {
513	>	public void run() {
514	>	lock.writeLock().lock();
515	>	lock.writeLock().unlock();
516	>	}
517	>	});
518	>	Thread t2 = new Thread(new Runnable() {
519	>	public void run() {
520	>	lock.writeLock().lock();
521	>	lock.writeLock().unlock();
522	>	}
523	>	});
524	>
525	>	try {
526	>	t1.start();
527	>	t2.start();
528	>	lock.writeLock().lock();
529	>	lock.writeLock().unlock();
530	>	Thread.sleep(SHORT_DELAY_MS);
531	>	lock.writeLock().lock();
532	>	lock.writeLock().unlock();
533	>	lock.writeLock().unlock();
534	>	t1.join(MEDIUM_DELAY_MS);
535	>	t2.join(MEDIUM_DELAY_MS);
536	>	assertTrue(!t1.isAlive());
537	>	assertTrue(!t2.isAlive());
538	>
539	>	} catch(Exception e){
540	>	unexpectedException();
541	>	}
542	>	}
543	>
544	>
545	>	/**
546	>	* Fair Read trylock succeeds if write locked by current thread
547	>	*/
548	>	public void testReadHoldingWriteLockFair() {
549	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
550	>	lock.writeLock().lock();
551	>	assertTrue(lock.readLock().tryLock());
552	>	lock.readLock().unlock();
553	>	lock.writeLock().unlock();
554	>	}
555	>
556	>	/**
557	>	* Fair Read lock succeeds if write locked by current thread even if
558	>	* other threads are waiting for readlock
559	>	*/
560	>	public void testReadHoldingWriteLockFair2() {
561	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
562	>	lock.writeLock().lock();
563	>	Thread t1 = new Thread(new Runnable() {
564	>	public void run() {
565	>	lock.readLock().lock();
566	>	lock.readLock().unlock();
567	>	}
568	>	});
569	>	Thread t2 = new Thread(new Runnable() {
570	>	public void run() {
571	>	lock.readLock().lock();
572	>	lock.readLock().unlock();
573	>	}
574	>	});
575	>
576	>	try {
577	>	t1.start();
578	>	t2.start();
579	>	lock.readLock().lock();
580	>	lock.readLock().unlock();
581	>	Thread.sleep(SHORT_DELAY_MS);
582	>	lock.readLock().lock();
583	>	lock.readLock().unlock();
584	>	lock.writeLock().unlock();
585	>	t1.join(MEDIUM_DELAY_MS);
586	>	t2.join(MEDIUM_DELAY_MS);
587	>	assertTrue(!t1.isAlive());
588	>	assertTrue(!t2.isAlive());
589	>
590	>	} catch(Exception e){
591	>	unexpectedException();
592	>	}
593	>	}
594	>
595	>
596	>	/**
597	>	* Fair Read lock succeeds if write locked by current thread even if
598	>	* other threads are waiting for writelock
599	>	*/
600	>	public void testReadHoldingWriteLockFair3() {
601	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
602	>	lock.writeLock().lock();
603	>	Thread t1 = new Thread(new Runnable() {
604	>	public void run() {
605	>	lock.writeLock().lock();
606	>	lock.writeLock().unlock();
607	>	}
608	>	});
609	>	Thread t2 = new Thread(new Runnable() {
610	>	public void run() {
611	>	lock.writeLock().lock();
612	>	lock.writeLock().unlock();
613	>	}
614	>	});
615	>
616	>	try {
617	>	t1.start();
618	>	t2.start();
619	>	lock.readLock().lock();
620	>	lock.readLock().unlock();
621	>	Thread.sleep(SHORT_DELAY_MS);
622	>	lock.readLock().lock();
623	>	lock.readLock().unlock();
624	>	lock.writeLock().unlock();
625	>	t1.join(MEDIUM_DELAY_MS);
626	>	t2.join(MEDIUM_DELAY_MS);
627	>	assertTrue(!t1.isAlive());
628	>	assertTrue(!t2.isAlive());
629	>
630	>	} catch(Exception e){
631	>	unexpectedException();
632	>	}
633	>	}
634	>
635	>
636	>	/**
637	>	* Fair Write lock succeeds if write locked by current thread even if
638	>	* other threads are waiting for writelock
639	>	*/
640	>	public void testWriteHoldingWriteLockFair4() {
641	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
642	>	lock.writeLock().lock();
643	>	Thread t1 = new Thread(new Runnable() {
644	>	public void run() {
645	>	lock.writeLock().lock();
646	>	lock.writeLock().unlock();
647	>	}
648	>	});
649	>	Thread t2 = new Thread(new Runnable() {
650	>	public void run() {
651	>	lock.writeLock().lock();
652	>	lock.writeLock().unlock();
653	>	}
654	>	});
655	>
656	>	try {
657	>	t1.start();
658	>	t2.start();
659	>	Thread.sleep(SHORT_DELAY_MS);
660	>	assertTrue(lock.isWriteLockedByCurrentThread());
661	>	assertTrue(lock.getWriteHoldCount() == 1);
662	>	lock.writeLock().lock();
663	>	assertTrue(lock.getWriteHoldCount() == 2);
664	>	lock.writeLock().unlock();
665	>	lock.writeLock().lock();
666	>	lock.writeLock().unlock();
667	>	lock.writeLock().unlock();
668	>	t1.join(MEDIUM_DELAY_MS);
669	>	t2.join(MEDIUM_DELAY_MS);
670	>	assertTrue(!t1.isAlive());
671	>	assertTrue(!t2.isAlive());
672	>
673	>	} catch(Exception e){
674	>	unexpectedException();
675	>	}
676	>	}
677	>
678	>
679	>	/**
680	>	* Read tryLock succeeds if readlocked but not writelocked
681		*/
682		public void testTryLockWhenReadLocked() {
683		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 401 | Line 700 | public class ReentrantReadWriteLockTest
700
701
702		/**
703	<	* write trylock fails when readlocked
703	>	* write tryLock fails when readlocked
704		*/
705		public void testWriteTryLockWhenReadLocked() {
706		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 420 | Line 719 | public class ReentrantReadWriteLockTest
719		}
720		}
721
722	+
723	+	/**
724	+	* Fair Read tryLock succeeds if readlocked but not writelocked
725	+	*/
726	+	public void testTryLockWhenReadLockedFair() {
727	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
728	+	lock.readLock().lock();
729	+	Thread t = new Thread(new Runnable() {
730	+	public void run() {
731	+	threadAssertTrue(lock.readLock().tryLock());
732	+	lock.readLock().unlock();
733	+	}
734	+	});
735	+	try {
736	+	t.start();
737	+	t.join();
738	+	lock.readLock().unlock();
739	+	} catch(Exception e){
740	+	unexpectedException();
741	+	}
742	+	}
743	+
744	+
745	+
746	+	/**
747	+	* Fair write tryLock fails when readlocked
748	+	*/
749	+	public void testWriteTryLockWhenReadLockedFair() {
750	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
751	+	lock.readLock().lock();
752	+	Thread t = new Thread(new Runnable() {
753	+	public void run() {
754	+	threadAssertFalse(lock.writeLock().tryLock());
755	+	}
756	+	});
757	+	try {
758	+	t.start();
759	+	t.join();
760	+	lock.readLock().unlock();
761	+	} catch(Exception e){
762	+	unexpectedException();
763	+	}
764	+	}
765	+
766
767
768		/**
769	<	* write timed trylock times out if locked
769	>	* write timed tryLock times out if locked
770		*/
771		public void testWriteTryLock_Timeout() {
772		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 447 | Line 790 | public class ReentrantReadWriteLockTest
790		}
791
792		/**
793	<	* read timed trylock times out if write-locked
793	>	* read timed tryLock times out if write-locked
794		*/
795		public void testReadTryLock_Timeout() {
796		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
#	Line 493 | Line 836 | public class ReentrantReadWriteLockTest
836		});
837		try {
838		t.start();
839	+	Thread.sleep(SHORT_DELAY_MS);
840		t.interrupt();
841		t.join();
842		lock.writeLock().unlock();
#	Line 523 | Line 867 | public class ReentrantReadWriteLockTest
867		});
868		try {
869		t.start();
870	+	Thread.sleep(SHORT_DELAY_MS);
871		t.interrupt();
872		t.join();
873		lock.writeLock().unlock();
#	Line 591 | Line 936 | public class ReentrantReadWriteLockTest
936		final Condition c = lock.writeLock().newCondition();
937		try {
938		lock.writeLock().lock();
594	–	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
939		lock.writeLock().unlock();
940		}
941		catch (Exception ex) {
#	Line 608 | Line 952 | public class ReentrantReadWriteLockTest
952		try {
953		lock.writeLock().lock();
954		java.util.Date d = new java.util.Date();
611	–	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
955		lock.writeLock().unlock();
956		}
957		catch (Exception ex) {
#	Line 649 | Line 992 | public class ReentrantReadWriteLockTest
992		}
993		}
994
995	+	/** A helper class for uninterruptible wait tests */
996	+	class UninterruptableThread extends Thread {
997	+	private Lock lock;
998	+	private Condition c;
999	+
1000	+	public volatile boolean canAwake = false;
1001	+	public volatile boolean interrupted = false;
1002	+	public volatile boolean lockStarted = false;
1003	+
1004	+	public UninterruptableThread(Lock lock, Condition c) {
1005	+	this.lock = lock;
1006	+	this.c = c;
1007	+	}
1008	+
1009	+	public synchronized void run() {
1010	+	lock.lock();
1011	+	lockStarted = true;
1012	+
1013	+	while (!canAwake) {
1014	+	c.awaitUninterruptibly();
1015	+	}
1016	+
1017	+	interrupted = isInterrupted();
1018	+	lock.unlock();
1019	+	}
1020	+	}
1021	+
1022		/**
1023		* awaitUninterruptibly doesn't abort on interrupt
1024		*/
1025		public void testAwaitUninterruptibly() {
1026	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1026	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1027		final Condition c = lock.writeLock().newCondition();
1028	<	Thread t = new Thread(new Runnable() {
659	<	public void run() {
660	<	lock.writeLock().lock();
661	<	c.awaitUninterruptibly();
662	<	lock.writeLock().unlock();
663	<	}
664	<	});
1028	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
1029
1030		try {
1031	<	t.start();
1032	<	Thread.sleep(SHORT_DELAY_MS);
1033	<	t.interrupt();
1031	>	thread.start();
1032	>
1033	>	while (!thread.lockStarted) {
1034	>	Thread.sleep(100);
1035	>	}
1036	>
1037		lock.writeLock().lock();
1038	<	c.signal();
1039	<	lock.writeLock().unlock();
1040	<	assert(t.isInterrupted());
1041	<	t.join(SHORT_DELAY_MS);
1042	<	assertFalse(t.isAlive());
1043	<	}
1044	<	catch (Exception ex) {
1038	>	try {
1039	>	thread.interrupt();
1040	>	thread.canAwake = true;
1041	>	c.signal();
1042	>	} finally {
1043	>	lock.writeLock().unlock();
1044	>	}
1045	>
1046	>	thread.join();
1047	>	assertTrue(thread.interrupted);
1048	>	assertFalse(thread.isAlive());
1049	>	} catch (Exception ex) {
1050		unexpectedException();
1051		}
1052		}
#	Line 877 | Line 1249 | public class ReentrantReadWriteLockTest
1249		}
1250
1251		/**
1252	+	* hasQueuedThread(null) throws NPE
1253	+	*/
1254	+	public void testHasQueuedThreadNPE() {
1255	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1256	+	try {
1257	+	sync.hasQueuedThread(null);
1258	+	shouldThrow();
1259	+	} catch (NullPointerException success) {
1260	+	}
1261	+	}
1262	+
1263	+	/**
1264	+	* hasQueuedThread reports whether a thread is queued.
1265	+	*/
1266	+	public void testHasQueuedThread() {
1267	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1268	+	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1269	+	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1270	+	try {
1271	+	assertFalse(sync.hasQueuedThread(t1));
1272	+	assertFalse(sync.hasQueuedThread(t2));
1273	+	sync.writeLock().lock();
1274	+	t1.start();
1275	+	Thread.sleep(SHORT_DELAY_MS);
1276	+	assertTrue(sync.hasQueuedThread(t1));
1277	+	t2.start();
1278	+	Thread.sleep(SHORT_DELAY_MS);
1279	+	assertTrue(sync.hasQueuedThread(t1));
1280	+	assertTrue(sync.hasQueuedThread(t2));
1281	+	t1.interrupt();
1282	+	Thread.sleep(SHORT_DELAY_MS);
1283	+	assertFalse(sync.hasQueuedThread(t1));
1284	+	assertTrue(sync.hasQueuedThread(t2));
1285	+	sync.writeLock().unlock();
1286	+	Thread.sleep(SHORT_DELAY_MS);
1287	+	assertFalse(sync.hasQueuedThread(t1));
1288	+	Thread.sleep(SHORT_DELAY_MS);
1289	+	assertFalse(sync.hasQueuedThread(t2));
1290	+	t1.join();
1291	+	t2.join();
1292	+	} catch(Exception e){
1293	+	unexpectedException();
1294	+	}
1295	+	}
1296	+
1297	+
1298	+	/**
1299		* getQueueLength reports number of waiting threads
1300		*/
1301		public void testGetQueueLength() {
#	Line 938 | Line 1357 | public class ReentrantReadWriteLockTest
1357		}
1358
1359		/**
1360	+	* hasWaiters throws NPE if null
1361	+	*/
1362	+	public void testHasWaitersNPE() {
1363	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1364	+	try {
1365	+	lock.hasWaiters(null);
1366	+	shouldThrow();
1367	+	} catch (NullPointerException success) {
1368	+	} catch (Exception ex) {
1369	+	unexpectedException();
1370	+	}
1371	+	}
1372	+
1373	+	/**
1374	+	* getWaitQueueLength throws NPE if null
1375	+	*/
1376	+	public void testGetWaitQueueLengthNPE() {
1377	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1378	+	try {
1379	+	lock.getWaitQueueLength(null);
1380	+	shouldThrow();
1381	+	} catch (NullPointerException success) {
1382	+	} catch (Exception ex) {
1383	+	unexpectedException();
1384	+	}
1385	+	}
1386	+
1387	+
1388	+	/**
1389	+	* getWaitingThreads throws NPE if null
1390	+	*/
1391	+	public void testGetWaitingThreadsNPE() {
1392	+	final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock();
1393	+	try {
1394	+	lock.getWaitingThreads(null);
1395	+	shouldThrow();
1396	+	} catch (NullPointerException success) {
1397	+	} catch (Exception ex) {
1398	+	unexpectedException();
1399	+	}
1400	+	}
1401	+
1402	+	/**
1403		* hasWaiters throws IAE if not owned
1404		*/
1405		public void testHasWaitersIAE() {
#	Line 1181 | Line 1643 | public class ReentrantReadWriteLockTest
1643		}
1644		}
1645
1646	+	/**
1647	+	* toString indicates current lock state
1648	+	*/
1649	+	public void testToString() {
1650	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1651	+	String us = lock.toString();
1652	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1653	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1654	+	lock.writeLock().lock();
1655	+	String ws = lock.toString();
1656	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1657	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1658	+	lock.writeLock().unlock();
1659	+	lock.readLock().lock();
1660	+	lock.readLock().lock();
1661	+	String rs = lock.toString();
1662	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1663	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1664	+	}
1665	+
1666	+	/**
1667	+	* readLock.toString indicates current lock state
1668	+	*/
1669	+	public void testReadLockToString() {
1670	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1671	+	String us = lock.readLock().toString();
1672	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1673	+	lock.readLock().lock();
1674	+	lock.readLock().lock();
1675	+	String rs = lock.readLock().toString();
1676	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1677	+	}
1678	+
1679	+	/**
1680	+	* writeLock.toString indicates current lock state
1681	+	*/
1682	+	public void testWriteLockToString() {
1683	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1684	+	String us = lock.writeLock().toString();
1685	+	assertTrue(us.indexOf("Unlocked") >= 0);
1686	+	lock.writeLock().lock();
1687	+	String ls = lock.writeLock().toString();
1688	+	assertTrue(ls.indexOf("Locked") >= 0);
1689	+	}
1690	+
1691		}

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