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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.18 by dl, Sat Jan 10 01:41:59 2004 UTC vs.
Revision 1.24 by dl, Tue Aug 2 11:34:04 2005 UTC

#	Line 126 | Line 126 | public class ReentrantReadWriteLockTest
126		/**
127		* getWriteHoldCount returns number of recursive holds
128		*/
129	<	public void testGetHoldCount() {
129	>	public void testGetWriteHoldCount() {
130		ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
131		for(int i = 1; i <= SIZE; i++) {
132		lock.writeLock().lock();
#	Line 137 | Line 137 | public class ReentrantReadWriteLockTest
137		assertEquals(i-1,lock.getWriteHoldCount());
138		}
139		}
140	+
141	+	/**
142	+	* getReadHoldCount returns number of recursive holds
143	+	*/
144	+	public void testGetReadHoldCount() {
145	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
146	+	for(int i = 1; i <= SIZE; i++) {
147	+	lock.readLock().lock();
148	+	assertEquals(i,lock.getReadHoldCount());
149	+	}
150	+	for(int i = SIZE; i > 0; i--) {
151	+	lock.readLock().unlock();
152	+	assertEquals(i-1,lock.getReadHoldCount());
153	+	}
154	+	}
155
156
157		/**
#	Line 376 | Line 391 | public class ReentrantReadWriteLockTest
391		}
392		}
393
394	+	/**
395	+	* Read trylock succeeds if write locked by current thread
396	+	*/
397	+	public void testReadHoldingWriteLock() {
398	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
399	+	lock.writeLock().lock();
400	+	assertTrue(lock.readLock().tryLock());
401	+	lock.readLock().unlock();
402	+	lock.writeLock().unlock();
403	+	}
404	+
405	+	/**
406	+	* Read lock succeeds if write locked by current thread even if
407	+	* other threads are waiting for readlock
408	+	*/
409	+	public void testReadHoldingWriteLock2() {
410	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
411	+	lock.writeLock().lock();
412	+	Thread t1 = new Thread(new Runnable() {
413	+	public void run() {
414	+	lock.readLock().lock();
415	+	lock.readLock().unlock();
416	+	}
417	+	});
418	+	Thread t2 = new Thread(new Runnable() {
419	+	public void run() {
420	+	lock.readLock().lock();
421	+	lock.readLock().unlock();
422	+	}
423	+	});
424	+
425	+	try {
426	+	t1.start();
427	+	t2.start();
428	+	lock.readLock().lock();
429	+	lock.readLock().unlock();
430	+	Thread.sleep(SHORT_DELAY_MS);
431	+	lock.readLock().lock();
432	+	lock.readLock().unlock();
433	+	lock.writeLock().unlock();
434	+	t1.join(MEDIUM_DELAY_MS);
435	+	t2.join(MEDIUM_DELAY_MS);
436	+	assertTrue(!t1.isAlive());
437	+	assertTrue(!t2.isAlive());
438	+
439	+	} catch(Exception e){
440	+	unexpectedException();
441	+	}
442	+	}
443	+
444	+	/**
445	+	*  Read lock succeeds if write locked by current thread even if
446	+	* other threads are waiting for writelock
447	+	*/
448	+	public void testReadHoldingWriteLock3() {
449	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
450	+	lock.writeLock().lock();
451	+	Thread t1 = new Thread(new Runnable() {
452	+	public void run() {
453	+	lock.writeLock().lock();
454	+	lock.writeLock().unlock();
455	+	}
456	+	});
457	+	Thread t2 = new Thread(new Runnable() {
458	+	public void run() {
459	+	lock.writeLock().lock();
460	+	lock.writeLock().unlock();
461	+	}
462	+	});
463	+
464	+	try {
465	+	t1.start();
466	+	t2.start();
467	+	lock.readLock().lock();
468	+	lock.readLock().unlock();
469	+	Thread.sleep(SHORT_DELAY_MS);
470	+	lock.readLock().lock();
471	+	lock.readLock().unlock();
472	+	lock.writeLock().unlock();
473	+	t1.join(MEDIUM_DELAY_MS);
474	+	t2.join(MEDIUM_DELAY_MS);
475	+	assertTrue(!t1.isAlive());
476	+	assertTrue(!t2.isAlive());
477	+
478	+	} catch(Exception e){
479	+	unexpectedException();
480	+	}
481	+	}
482	+
483	+
484	+	/**
485	+	*  Write lock succeeds if write locked by current thread even if
486	+	* other threads are waiting for writelock
487	+	*/
488	+	public void testWriteHoldingWriteLock4() {
489	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
490	+	lock.writeLock().lock();
491	+	Thread t1 = new Thread(new Runnable() {
492	+	public void run() {
493	+	lock.writeLock().lock();
494	+	lock.writeLock().unlock();
495	+	}
496	+	});
497	+	Thread t2 = new Thread(new Runnable() {
498	+	public void run() {
499	+	lock.writeLock().lock();
500	+	lock.writeLock().unlock();
501	+	}
502	+	});
503	+
504	+	try {
505	+	t1.start();
506	+	t2.start();
507	+	lock.writeLock().lock();
508	+	lock.writeLock().unlock();
509	+	Thread.sleep(SHORT_DELAY_MS);
510	+	lock.writeLock().lock();
511	+	lock.writeLock().unlock();
512	+	lock.writeLock().unlock();
513	+	t1.join(MEDIUM_DELAY_MS);
514	+	t2.join(MEDIUM_DELAY_MS);
515	+	assertTrue(!t1.isAlive());
516	+	assertTrue(!t2.isAlive());
517	+
518	+	} catch(Exception e){
519	+	unexpectedException();
520	+	}
521	+	}
522	+
523	+
524	+	/**
525	+	* Fair Read trylock succeeds if write locked by current thread
526	+	*/
527	+	public void testReadHoldingWriteLockFair() {
528	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
529	+	lock.writeLock().lock();
530	+	assertTrue(lock.readLock().tryLock());
531	+	lock.readLock().unlock();
532	+	lock.writeLock().unlock();
533	+	}
534	+
535	+	/**
536	+	* Fair Read lock succeeds if write locked by current thread even if
537	+	* other threads are waiting for readlock
538	+	*/
539	+	public void testReadHoldingWriteLockFair2() {
540	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
541	+	lock.writeLock().lock();
542	+	Thread t1 = new Thread(new Runnable() {
543	+	public void run() {
544	+	lock.readLock().lock();
545	+	lock.readLock().unlock();
546	+	}
547	+	});
548	+	Thread t2 = new Thread(new Runnable() {
549	+	public void run() {
550	+	lock.readLock().lock();
551	+	lock.readLock().unlock();
552	+	}
553	+	});
554	+
555	+	try {
556	+	t1.start();
557	+	t2.start();
558	+	lock.readLock().lock();
559	+	lock.readLock().unlock();
560	+	Thread.sleep(SHORT_DELAY_MS);
561	+	lock.readLock().lock();
562	+	lock.readLock().unlock();
563	+	lock.writeLock().unlock();
564	+	t1.join(MEDIUM_DELAY_MS);
565	+	t2.join(MEDIUM_DELAY_MS);
566	+	assertTrue(!t1.isAlive());
567	+	assertTrue(!t2.isAlive());
568	+
569	+	} catch(Exception e){
570	+	unexpectedException();
571	+	}
572	+	}
573	+
574	+
575	+	/**
576	+	* Fair Read lock succeeds if write locked by current thread even if
577	+	* other threads are waiting for writelock
578	+	*/
579	+	public void testReadHoldingWriteLockFair3() {
580	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
581	+	lock.writeLock().lock();
582	+	Thread t1 = new Thread(new Runnable() {
583	+	public void run() {
584	+	lock.writeLock().lock();
585	+	lock.writeLock().unlock();
586	+	}
587	+	});
588	+	Thread t2 = new Thread(new Runnable() {
589	+	public void run() {
590	+	lock.writeLock().lock();
591	+	lock.writeLock().unlock();
592	+	}
593	+	});
594	+
595	+	try {
596	+	t1.start();
597	+	t2.start();
598	+	lock.readLock().lock();
599	+	lock.readLock().unlock();
600	+	Thread.sleep(SHORT_DELAY_MS);
601	+	lock.readLock().lock();
602	+	lock.readLock().unlock();
603	+	lock.writeLock().unlock();
604	+	t1.join(MEDIUM_DELAY_MS);
605	+	t2.join(MEDIUM_DELAY_MS);
606	+	assertTrue(!t1.isAlive());
607	+	assertTrue(!t2.isAlive());
608	+
609	+	} catch(Exception e){
610	+	unexpectedException();
611	+	}
612	+	}
613	+
614	+
615	+	/**
616	+	* Fair Write lock succeeds if write locked by current thread even if
617	+	* other threads are waiting for writelock
618	+	*/
619	+	public void testWriteHoldingWriteLockFair4() {
620	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
621	+	lock.writeLock().lock();
622	+	Thread t1 = new Thread(new Runnable() {
623	+	public void run() {
624	+	lock.writeLock().lock();
625	+	lock.writeLock().unlock();
626	+	}
627	+	});
628	+	Thread t2 = new Thread(new Runnable() {
629	+	public void run() {
630	+	lock.writeLock().lock();
631	+	lock.writeLock().unlock();
632	+	}
633	+	});
634	+
635	+	try {
636	+	t1.start();
637	+	t2.start();
638	+	Thread.sleep(SHORT_DELAY_MS);
639	+	assertTrue(lock.isWriteLockedByCurrentThread());
640	+	assertTrue(lock.getWriteHoldCount() == 1);
641	+	lock.writeLock().lock();
642	+	assertTrue(lock.getWriteHoldCount() == 2);
643	+	lock.writeLock().unlock();
644	+	lock.writeLock().lock();
645	+	lock.writeLock().unlock();
646	+	lock.writeLock().unlock();
647	+	t1.join(MEDIUM_DELAY_MS);
648	+	t2.join(MEDIUM_DELAY_MS);
649	+	assertTrue(!t1.isAlive());
650	+	assertTrue(!t2.isAlive());
651	+
652	+	} catch(Exception e){
653	+	unexpectedException();
654	+	}
655	+	}
656	+
657
658		/**
659		* Read tryLock succeeds if readlocked but not writelocked
#	Line 420 | Line 698 | public class ReentrantReadWriteLockTest
698		}
699		}
700
701	+
702	+	/**
703	+	* Fair Read tryLock succeeds if readlocked but not writelocked
704	+	*/
705	+	public void testTryLockWhenReadLockedFair() {
706	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
707	+	lock.readLock().lock();
708	+	Thread t = new Thread(new Runnable() {
709	+	public void run() {
710	+	threadAssertTrue(lock.readLock().tryLock());
711	+	lock.readLock().unlock();
712	+	}
713	+	});
714	+	try {
715	+	t.start();
716	+	t.join();
717	+	lock.readLock().unlock();
718	+	} catch(Exception e){
719	+	unexpectedException();
720	+	}
721	+	}
722	+
723	+
724	+
725	+	/**
726	+	* Fair write tryLock fails when readlocked
727	+	*/
728	+	public void testWriteTryLockWhenReadLockedFair() {
729	+	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true);
730	+	lock.readLock().lock();
731	+	Thread t = new Thread(new Runnable() {
732	+	public void run() {
733	+	threadAssertFalse(lock.writeLock().tryLock());
734	+	}
735	+	});
736	+	try {
737	+	t.start();
738	+	t.join();
739	+	lock.readLock().unlock();
740	+	} catch(Exception e){
741	+	unexpectedException();
742	+	}
743	+	}
744	+
745
746
747		/**
#	Line 591 | Line 913 | public class ReentrantReadWriteLockTest
913		final Condition c = lock.writeLock().newCondition();
914		try {
915		lock.writeLock().lock();
594	–	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
916		lock.writeLock().unlock();
917		}
918		catch (Exception ex) {
#	Line 608 | Line 929 | public class ReentrantReadWriteLockTest
929		try {
930		lock.writeLock().lock();
931		java.util.Date d = new java.util.Date();
611	–	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
932		lock.writeLock().unlock();
933		}
934		catch (Exception ex) {
#	Line 649 | Line 969 | public class ReentrantReadWriteLockTest
969		}
970		}
971
972	+	/** A helper class for uninterruptible wait tests */
973	+	class UninterruptableThread extends Thread {
974	+	private Lock lock;
975	+	private Condition c;
976	+
977	+	public volatile boolean canAwake = false;
978	+	public volatile boolean interrupted = false;
979	+	public volatile boolean lockStarted = false;
980	+
981	+	public UninterruptableThread(Lock lock, Condition c) {
982	+	this.lock = lock;
983	+	this.c = c;
984	+	}
985	+
986	+	public synchronized void run() {
987	+	lock.lock();
988	+	lockStarted = true;
989	+
990	+	while (!canAwake) {
991	+	c.awaitUninterruptibly();
992	+	}
993	+
994	+	interrupted = isInterrupted();
995	+	lock.unlock();
996	+	}
997	+	}
998	+
999		/**
1000		* awaitUninterruptibly doesn't abort on interrupt
1001		*/
1002		public void testAwaitUninterruptibly() {
1003	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1003	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1004		final Condition c = lock.writeLock().newCondition();
1005	<	Thread t = new Thread(new Runnable() {
659	<	public void run() {
660	<	lock.writeLock().lock();
661	<	c.awaitUninterruptibly();
662	<	lock.writeLock().unlock();
663	<	}
664	<	});
1005	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
1006
1007		try {
1008	<	t.start();
1009	<	Thread.sleep(SHORT_DELAY_MS);
1010	<	t.interrupt();
1008	>	thread.start();
1009	>
1010	>	while (!thread.lockStarted) {
1011	>	Thread.sleep(100);
1012	>	}
1013	>
1014		lock.writeLock().lock();
1015	<	c.signal();
1016	<	lock.writeLock().unlock();
1017	<	assert(t.isInterrupted());
1018	<	t.join(SHORT_DELAY_MS);
1019	<	assertFalse(t.isAlive());
1020	<	}
1021	<	catch (Exception ex) {
1015	>	try {
1016	>	thread.interrupt();
1017	>	thread.canAwake = true;
1018	>	c.signal();
1019	>	} finally {
1020	>	lock.writeLock().unlock();
1021	>	}
1022	>
1023	>	thread.join();
1024	>	assertTrue(thread.interrupted);
1025	>	assertFalse(thread.isAlive());
1026	>	} catch (Exception ex) {
1027		unexpectedException();
1028		}
1029		}
#	Line 877 | Line 1226 | public class ReentrantReadWriteLockTest
1226		}
1227
1228		/**
1229	+	* hasQueuedThread(null) throws NPE
1230	+	*/
1231	+	public void testHasQueuedThreadNPE() {
1232	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1233	+	try {
1234	+	sync.hasQueuedThread(null);
1235	+	shouldThrow();
1236	+	} catch (NullPointerException success) {
1237	+	}
1238	+	}
1239	+
1240	+	/**
1241	+	* hasQueuedThread reports whether a thread is queued.
1242	+	*/
1243	+	public void testHasQueuedThread() {
1244	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1245	+	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1246	+	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1247	+	try {
1248	+	assertFalse(sync.hasQueuedThread(t1));
1249	+	assertFalse(sync.hasQueuedThread(t2));
1250	+	sync.writeLock().lock();
1251	+	t1.start();
1252	+	Thread.sleep(SHORT_DELAY_MS);
1253	+	assertTrue(sync.hasQueuedThread(t1));
1254	+	t2.start();
1255	+	Thread.sleep(SHORT_DELAY_MS);
1256	+	assertTrue(sync.hasQueuedThread(t1));
1257	+	assertTrue(sync.hasQueuedThread(t2));
1258	+	t1.interrupt();
1259	+	Thread.sleep(SHORT_DELAY_MS);
1260	+	assertFalse(sync.hasQueuedThread(t1));
1261	+	assertTrue(sync.hasQueuedThread(t2));
1262	+	sync.writeLock().unlock();
1263	+	Thread.sleep(SHORT_DELAY_MS);
1264	+	assertFalse(sync.hasQueuedThread(t1));
1265	+	Thread.sleep(SHORT_DELAY_MS);
1266	+	assertFalse(sync.hasQueuedThread(t2));
1267	+	t1.join();
1268	+	t2.join();
1269	+	} catch(Exception e){
1270	+	unexpectedException();
1271	+	}
1272	+	}
1273	+
1274	+
1275	+	/**
1276		* getQueueLength reports number of waiting threads
1277		*/
1278		public void testGetQueueLength() {

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