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

Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.15 by dl, Mon Dec 29 19:05:40 2003 UTC vs.
Revision 1.23 by dl, Mon Aug 1 19:53:01 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 156 | Line 171 | public class ReentrantReadWriteLockTest
171		*/
172		public void testWriteLockInterruptibly_Interrupted() {
173		final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
159	–	lock.writeLock().lock();
174		Thread t = new Thread(new Runnable() {
175		public void run() {
176		try {
177		lock.writeLock().lockInterruptibly();
178	<	threadShouldThrow();
178	>	lock.writeLock().unlock();
179	>	lock.writeLock().lockInterruptibly();
180	>	lock.writeLock().unlock();
181		} catch(InterruptedException success){}
182		}
183		});
184		try {
185	+	lock.writeLock().lock();
186		t.start();
187		t.interrupt();
188		lock.writeLock().unlock();
#	Line 185 | Line 202 | public class ReentrantReadWriteLockTest
202		public void run() {
203		try {
204		lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
188	–	threadShouldThrow();
205		} catch(InterruptedException success){}
206		}
207		});
#	Line 209 | Line 225 | public class ReentrantReadWriteLockTest
225		public void run() {
226		try {
227		lock.readLock().lockInterruptibly();
212	–	threadShouldThrow();
228		} catch(InterruptedException success){}
229		}
230		});
#	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 591 | Line 869 | public class ReentrantReadWriteLockTest
869		final Condition c = lock.writeLock().newCondition();
870		try {
871		lock.writeLock().lock();
594	–	assertFalse(c.await(10, TimeUnit.MILLISECONDS));
872		lock.writeLock().unlock();
873		}
874		catch (Exception ex) {
#	Line 608 | Line 885 | public class ReentrantReadWriteLockTest
885		try {
886		lock.writeLock().lock();
887		java.util.Date d = new java.util.Date();
611	–	assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
888		lock.writeLock().unlock();
889		}
890		catch (Exception ex) {
#	Line 649 | Line 925 | public class ReentrantReadWriteLockTest
925		}
926		}
927
928	+	/** A helper class for uninterruptible wait tests */
929	+	class UninterruptableThread extends Thread {
930	+	private Lock lock;
931	+	private Condition c;
932	+
933	+	public volatile boolean canAwake = false;
934	+	public volatile boolean interrupted = false;
935	+	public volatile boolean lockStarted = false;
936	+
937	+	public UninterruptableThread(Lock lock, Condition c) {
938	+	this.lock = lock;
939	+	this.c = c;
940	+	}
941	+
942	+	public synchronized void run() {
943	+	lock.lock();
944	+	lockStarted = true;
945	+
946	+	while (!canAwake) {
947	+	c.awaitUninterruptibly();
948	+	}
949	+
950	+	interrupted = isInterrupted();
951	+	lock.unlock();
952	+	}
953	+	}
954	+
955		/**
956		* awaitUninterruptibly doesn't abort on interrupt
957		*/
958		public void testAwaitUninterruptibly() {
959	<	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
959	>	final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
960		final Condition c = lock.writeLock().newCondition();
961	<	Thread t = new Thread(new Runnable() {
659	<	public void run() {
660	<	lock.writeLock().lock();
661	<	c.awaitUninterruptibly();
662	<	lock.writeLock().unlock();
663	<	}
664	<	});
961	>	UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c);
962
963		try {
964	<	t.start();
965	<	Thread.sleep(SHORT_DELAY_MS);
966	<	t.interrupt();
964	>	thread.start();
965	>
966	>	while (!thread.lockStarted) {
967	>	Thread.sleep(100);
968	>	}
969	>
970		lock.writeLock().lock();
971	<	c.signal();
972	<	lock.writeLock().unlock();
973	<	assert(t.isInterrupted());
974	<	t.join(SHORT_DELAY_MS);
975	<	assertFalse(t.isAlive());
976	<	}
977	<	catch (Exception ex) {
971	>	try {
972	>	thread.interrupt();
973	>	thread.canAwake = true;
974	>	c.signal();
975	>	} finally {
976	>	lock.writeLock().unlock();
977	>	}
978	>
979	>	thread.join();
980	>	assertTrue(thread.interrupted);
981	>	assertFalse(thread.isAlive());
982	>	} catch (Exception ex) {
983		unexpectedException();
984		}
985		}
#	Line 877 | Line 1182 | public class ReentrantReadWriteLockTest
1182		}
1183
1184		/**
1185	+	* hasQueuedThread(null) throws NPE
1186	+	*/
1187	+	public void testHasQueuedThreadNPE() {
1188	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1189	+	try {
1190	+	sync.hasQueuedThread(null);
1191	+	shouldThrow();
1192	+	} catch (NullPointerException success) {
1193	+	}
1194	+	}
1195	+
1196	+	/**
1197	+	* hasQueuedThread reports whether a thread is queued.
1198	+	*/
1199	+	public void testHasQueuedThread() {
1200	+	final ReentrantReadWriteLock sync = new ReentrantReadWriteLock();
1201	+	Thread t1 = new Thread(new InterruptedLockRunnable(sync));
1202	+	Thread t2 = new Thread(new InterruptibleLockRunnable(sync));
1203	+	try {
1204	+	assertFalse(sync.hasQueuedThread(t1));
1205	+	assertFalse(sync.hasQueuedThread(t2));
1206	+	sync.writeLock().lock();
1207	+	t1.start();
1208	+	Thread.sleep(SHORT_DELAY_MS);
1209	+	assertTrue(sync.hasQueuedThread(t1));
1210	+	t2.start();
1211	+	Thread.sleep(SHORT_DELAY_MS);
1212	+	assertTrue(sync.hasQueuedThread(t1));
1213	+	assertTrue(sync.hasQueuedThread(t2));
1214	+	t1.interrupt();
1215	+	Thread.sleep(SHORT_DELAY_MS);
1216	+	assertFalse(sync.hasQueuedThread(t1));
1217	+	assertTrue(sync.hasQueuedThread(t2));
1218	+	sync.writeLock().unlock();
1219	+	Thread.sleep(SHORT_DELAY_MS);
1220	+	assertFalse(sync.hasQueuedThread(t1));
1221	+	Thread.sleep(SHORT_DELAY_MS);
1222	+	assertFalse(sync.hasQueuedThread(t2));
1223	+	t1.join();
1224	+	t2.join();
1225	+	} catch(Exception e){
1226	+	unexpectedException();
1227	+	}
1228	+	}
1229	+
1230	+
1231	+	/**
1232		* getQueueLength reports number of waiting threads
1233		*/
1234		public void testGetQueueLength() {
#	Line 1224 | Line 1576 | public class ReentrantReadWriteLockTest
1576		}
1577		}
1578
1579	+	/**
1580	+	* toString indicates current lock state
1581	+	*/
1582	+	public void testToString() {
1583	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1584	+	String us = lock.toString();
1585	+	assertTrue(us.indexOf("Write locks = 0") >= 0);
1586	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1587	+	lock.writeLock().lock();
1588	+	String ws = lock.toString();
1589	+	assertTrue(ws.indexOf("Write locks = 1") >= 0);
1590	+	assertTrue(ws.indexOf("Read locks = 0") >= 0);
1591	+	lock.writeLock().unlock();
1592	+	lock.readLock().lock();
1593	+	lock.readLock().lock();
1594	+	String rs = lock.toString();
1595	+	assertTrue(rs.indexOf("Write locks = 0") >= 0);
1596	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1597	+	}
1598	+
1599	+	/**
1600	+	* readLock.toString indicates current lock state
1601	+	*/
1602	+	public void testReadLockToString() {
1603	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1604	+	String us = lock.readLock().toString();
1605	+	assertTrue(us.indexOf("Read locks = 0") >= 0);
1606	+	lock.readLock().lock();
1607	+	lock.readLock().lock();
1608	+	String rs = lock.readLock().toString();
1609	+	assertTrue(rs.indexOf("Read locks = 2") >= 0);
1610	+	}
1611	+
1612	+	/**
1613	+	* writeLock.toString indicates current lock state
1614	+	*/
1615	+	public void testWriteLockToString() {
1616	+	ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
1617	+	String us = lock.writeLock().toString();
1618	+	assertTrue(us.indexOf("Unlocked") >= 0);
1619	+	lock.writeLock().lock();
1620	+	String ls = lock.writeLock().toString();
1621	+	assertTrue(ls.indexOf("Locked") >= 0);
1622	+	}
1623	+
1624		}

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