ViewVC Help

View File | Revision Log | Show Annotations | Download File | Root Listing

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

Comparing jsr166/src/test/tck/SemaphoreTest.java (file contents):
Revision 1.5 by dl, Thu Sep 25 11:02:41 2003 UTC vs.
Revision 1.15 by jsr166, Mon Nov 2 20:28:32 2009 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.*;
#	Line 12 | Line 13 | import java.io.*;
13
14		public class SemaphoreTest extends JSR166TestCase {
15		public static void main(String[] args) {
16	<	junit.textui.TestRunner.run (suite());
16	>	junit.textui.TestRunner.run (suite());
17		}
18		public static Test suite() {
19		return new TestSuite(SemaphoreTest.class);
20		}
21
22		/**
23	+	* Subclass to expose protected methods
24	+	*/
25	+	static class PublicSemaphore extends Semaphore {
26	+	PublicSemaphore(int p, boolean f) { super(p, f); }
27	+	public Collection<Thread> getQueuedThreads() {
28	+	return super.getQueuedThreads();
29	+	}
30	+	public void reducePermits(int p) {
31	+	super.reducePermits(p);
32	+	}
33	+	}
34	+
35	+	/**
36	+	* A runnable calling acquire
37	+	*/
38	+	class InterruptibleLockRunnable implements Runnable {
39	+	final Semaphore lock;
40	+	InterruptibleLockRunnable(Semaphore l) { lock = l; }
41	+	public void run() {
42	+	try {
43	+	lock.acquire();
44	+	} catch(InterruptedException success){}
45	+	}
46	+	}
47	+
48	+
49	+	/**
50	+	* A runnable calling acquire that expects to be
51	+	* interrupted
52	+	*/
53	+	class InterruptedLockRunnable implements Runnable {
54	+	final Semaphore lock;
55	+	InterruptedLockRunnable(Semaphore l) { lock = l; }
56	+	public void run() {
57	+	try {
58	+	lock.acquire();
59	+	threadShouldThrow();
60	+	} catch(InterruptedException success){}
61	+	}
62	+	}
63	+
64	+	/**
65		* Zero, negative, and positive initial values are allowed in constructor
66		*/
67		public void testConstructor() {
68	+	Semaphore s0 = new Semaphore(0, false);
69	+	assertEquals(0, s0.availablePermits());
70	+	assertFalse(s0.isFair());
71	+	Semaphore s1 = new Semaphore(-1, false);
72	+	assertEquals(-1, s1.availablePermits());
73	+	assertFalse(s1.isFair());
74	+	Semaphore s2 = new Semaphore(-1, false);
75	+	assertEquals(-1, s2.availablePermits());
76	+	assertFalse(s2.isFair());
77	+	}
78	+
79	+	/**
80	+	* Constructor without fairness argument behaves as nonfair
81	+	*/
82	+	public void testConstructor2() {
83		Semaphore s0 = new Semaphore(0);
84		assertEquals(0, s0.availablePermits());
85	+	assertFalse(s0.isFair());
86		Semaphore s1 = new Semaphore(-1);
87		assertEquals(-1, s1.availablePermits());
88	+	assertFalse(s1.isFair());
89		Semaphore s2 = new Semaphore(-1);
90		assertEquals(-1, s2.availablePermits());
91	+	assertFalse(s2.isFair());
92		}
93
94		/**
95	<	* tryAcquire succeeds when sufficent permits, else fails
95	>	* tryAcquire succeeds when sufficient permits, else fails
96		*/
97		public void testTryAcquireInSameThread() {
98	<	Semaphore s = new Semaphore(2);
98	>	Semaphore s = new Semaphore(2, false);
99		assertEquals(2, s.availablePermits());
100		assertTrue(s.tryAcquire());
101		assertTrue(s.tryAcquire());
#	Line 46 | Line 107 | public class SemaphoreTest extends JSR16
107		* Acquire and release of semaphore succeed if initially available
108		*/
109		public void testAcquireReleaseInSameThread() {
110	<	Semaphore s = new Semaphore(1);
110	>	Semaphore s = new Semaphore(1, false);
111		try {
112		s.acquire();
113		s.release();
#	Line 69 | Line 130 | public class SemaphoreTest extends JSR16
130		* initially available
131		*/
132		public void testAcquireUninterruptiblyReleaseInSameThread() {
133	<	Semaphore s = new Semaphore(1);
133	>	Semaphore s = new Semaphore(1, false);
134		try {
135		s.acquireUninterruptibly();
136		s.release();
#	Line 91 | Line 152 | public class SemaphoreTest extends JSR16
152		* initially available
153		*/
154		public void testTimedAcquireReleaseInSameThread() {
155	<	Semaphore s = new Semaphore(1);
155	>	Semaphore s = new Semaphore(1, false);
156		try {
157		assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
158		s.release();
#	Line 113 | Line 174 | public class SemaphoreTest extends JSR16
174		* A release in one thread enables an acquire in another thread
175		*/
176		public void testAcquireReleaseInDifferentThreads() {
177	<	final Semaphore s = new Semaphore(0);
177	>	final Semaphore s = new Semaphore(0, false);
178		Thread t = new Thread(new Runnable() {
179		public void run() {
180		try {
#	Line 144 | Line 205 | public class SemaphoreTest extends JSR16
205		* A release in one thread enables an uninterruptible acquire in another thread
206		*/
207		public void testUninterruptibleAcquireReleaseInDifferentThreads() {
208	<	final Semaphore s = new Semaphore(0);
208	>	final Semaphore s = new Semaphore(0, false);
209		Thread t = new Thread(new Runnable() {
210		public void run() {
211		s.acquireUninterruptibly();
#	Line 172 | Line 233 | public class SemaphoreTest extends JSR16
233		*  A release in one thread enables a timed acquire in another thread
234		*/
235		public void testTimedAcquireReleaseInDifferentThreads() {
236	<	final Semaphore s = new Semaphore(1);
236	>	final Semaphore s = new Semaphore(1, false);
237		Thread t = new Thread(new Runnable() {
238		public void run() {
239		try {
#	Line 203 | Line 264 | public class SemaphoreTest extends JSR16
264		* A waiting acquire blocks interruptibly
265		*/
266		public void testAcquire_InterruptedException() {
267	<	final Semaphore s = new Semaphore(0);
267	>	final Semaphore s = new Semaphore(0, false);
268		Thread t = new Thread(new Runnable() {
269		public void run() {
270		try {
#	Line 221 | Line 282 | public class SemaphoreTest extends JSR16
282		unexpectedException();
283		}
284		}
285	<
285	>
286		/**
287		*  A waiting timed acquire blocks interruptibly
288		*/
289		public void testTryAcquire_InterruptedException() {
290	<	final Semaphore s = new Semaphore(0);
290	>	final Semaphore s = new Semaphore(0, false);
291		Thread t = new Thread(new Runnable() {
292		public void run() {
293		try {
#	Line 247 | Line 308 | public class SemaphoreTest extends JSR16
308		}
309
310		/**
311	+	* hasQueuedThreads reports whether there are waiting threads
312	+	*/
313	+	public void testHasQueuedThreads() {
314	+	final Semaphore lock = new Semaphore(1, false);
315	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
316	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
317	+	try {
318	+	assertFalse(lock.hasQueuedThreads());
319	+	lock.acquireUninterruptibly();
320	+	t1.start();
321	+	Thread.sleep(SHORT_DELAY_MS);
322	+	assertTrue(lock.hasQueuedThreads());
323	+	t2.start();
324	+	Thread.sleep(SHORT_DELAY_MS);
325	+	assertTrue(lock.hasQueuedThreads());
326	+	t1.interrupt();
327	+	Thread.sleep(SHORT_DELAY_MS);
328	+	assertTrue(lock.hasQueuedThreads());
329	+	lock.release();
330	+	Thread.sleep(SHORT_DELAY_MS);
331	+	assertFalse(lock.hasQueuedThreads());
332	+	t1.join();
333	+	t2.join();
334	+	} catch(Exception e){
335	+	unexpectedException();
336	+	}
337	+	}
338	+
339	+	/**
340	+	* getQueueLength reports number of waiting threads
341	+	*/
342	+	public void testGetQueueLength() {
343	+	final Semaphore lock = new Semaphore(1, false);
344	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
345	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
346	+	try {
347	+	assertEquals(0, lock.getQueueLength());
348	+	lock.acquireUninterruptibly();
349	+	t1.start();
350	+	Thread.sleep(SHORT_DELAY_MS);
351	+	assertEquals(1, lock.getQueueLength());
352	+	t2.start();
353	+	Thread.sleep(SHORT_DELAY_MS);
354	+	assertEquals(2, lock.getQueueLength());
355	+	t1.interrupt();
356	+	Thread.sleep(SHORT_DELAY_MS);
357	+	assertEquals(1, lock.getQueueLength());
358	+	lock.release();
359	+	Thread.sleep(SHORT_DELAY_MS);
360	+	assertEquals(0, lock.getQueueLength());
361	+	t1.join();
362	+	t2.join();
363	+	} catch(Exception e){
364	+	unexpectedException();
365	+	}
366	+	}
367	+
368	+	/**
369	+	* getQueuedThreads includes waiting threads
370	+	*/
371	+	public void testGetQueuedThreads() {
372	+	final PublicSemaphore lock = new PublicSemaphore(1, false);
373	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
374	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
375	+	try {
376	+	assertTrue(lock.getQueuedThreads().isEmpty());
377	+	lock.acquireUninterruptibly();
378	+	assertTrue(lock.getQueuedThreads().isEmpty());
379	+	t1.start();
380	+	Thread.sleep(SHORT_DELAY_MS);
381	+	assertTrue(lock.getQueuedThreads().contains(t1));
382	+	t2.start();
383	+	Thread.sleep(SHORT_DELAY_MS);
384	+	assertTrue(lock.getQueuedThreads().contains(t1));
385	+	assertTrue(lock.getQueuedThreads().contains(t2));
386	+	t1.interrupt();
387	+	Thread.sleep(SHORT_DELAY_MS);
388	+	assertFalse(lock.getQueuedThreads().contains(t1));
389	+	assertTrue(lock.getQueuedThreads().contains(t2));
390	+	lock.release();
391	+	Thread.sleep(SHORT_DELAY_MS);
392	+	assertTrue(lock.getQueuedThreads().isEmpty());
393	+	t1.join();
394	+	t2.join();
395	+	} catch(Exception e){
396	+	unexpectedException();
397	+	}
398	+	}
399	+
400	+	/**
401	+	* drainPermits reports and removes given number of permits
402	+	*/
403	+	public void testDrainPermits() {
404	+	Semaphore s = new Semaphore(0, false);
405	+	assertEquals(0, s.availablePermits());
406	+	assertEquals(0, s.drainPermits());
407	+	s.release(10);
408	+	assertEquals(10, s.availablePermits());
409	+	assertEquals(10, s.drainPermits());
410	+	assertEquals(0, s.availablePermits());
411	+	assertEquals(0, s.drainPermits());
412	+	}
413	+
414	+	/**
415	+	* reducePermits reduces number of permits
416	+	*/
417	+	public void testReducePermits() {
418	+	PublicSemaphore s = new PublicSemaphore(10, false);
419	+	assertEquals(10, s.availablePermits());
420	+	s.reducePermits(1);
421	+	assertEquals(9, s.availablePermits());
422	+	s.reducePermits(10);
423	+	assertEquals(-1, s.availablePermits());
424	+	}
425	+
426	+	/**
427		* a deserialized serialized semaphore has same number of permits
428		*/
429		public void testSerialization() {
430	<	Semaphore l = new Semaphore(3);
430	>	Semaphore l = new Semaphore(3, false);
431		try {
432		l.acquire();
433		l.release();
#	Line 263 | Line 440 | public class SemaphoreTest extends JSR16
440		ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
441		Semaphore r = (Semaphore) in.readObject();
442		assertEquals(3, r.availablePermits());
443	+	assertFalse(r.isFair());
444		r.acquire();
445		r.release();
446		} catch(Exception e){
#	Line 270 | Line 448 | public class SemaphoreTest extends JSR16
448		}
449		}
450
451	+
452	+	/**
453	+	* Zero, negative, and positive initial values are allowed in constructor
454	+	*/
455	+	public void testConstructor_fair() {
456	+	Semaphore s0 = new Semaphore(0, true);
457	+	assertEquals(0, s0.availablePermits());
458	+	assertTrue(s0.isFair());
459	+	Semaphore s1 = new Semaphore(-1, true);
460	+	assertEquals(-1, s1.availablePermits());
461	+	Semaphore s2 = new Semaphore(-1, true);
462	+	assertEquals(-1, s2.availablePermits());
463	+	}
464	+
465	+	/**
466	+	* tryAcquire succeeds when sufficient permits, else fails
467	+	*/
468	+	public void testTryAcquireInSameThread_fair() {
469	+	Semaphore s = new Semaphore(2, true);
470	+	assertEquals(2, s.availablePermits());
471	+	assertTrue(s.tryAcquire());
472	+	assertTrue(s.tryAcquire());
473	+	assertEquals(0, s.availablePermits());
474	+	assertFalse(s.tryAcquire());
475	+	}
476	+
477	+	/**
478	+	* tryAcquire(n) succeeds when sufficient permits, else fails
479	+	*/
480	+	public void testTryAcquireNInSameThread_fair() {
481	+	Semaphore s = new Semaphore(2, true);
482	+	assertEquals(2, s.availablePermits());
483	+	assertTrue(s.tryAcquire(2));
484	+	assertEquals(0, s.availablePermits());
485	+	assertFalse(s.tryAcquire());
486	+	}
487	+
488	+	/**
489	+	* Acquire and release of semaphore succeed if initially available
490	+	*/
491	+	public void testAcquireReleaseInSameThread_fair() {
492	+	Semaphore s = new Semaphore(1, true);
493	+	try {
494	+	s.acquire();
495	+	s.release();
496	+	s.acquire();
497	+	s.release();
498	+	s.acquire();
499	+	s.release();
500	+	s.acquire();
501	+	s.release();
502	+	s.acquire();
503	+	s.release();
504	+	assertEquals(1, s.availablePermits());
505	+	} catch( InterruptedException e){
506	+	unexpectedException();
507	+	}
508	+	}
509	+
510	+	/**
511	+	* Acquire(n) and release(n) of semaphore succeed if initially available
512	+	*/
513	+	public void testAcquireReleaseNInSameThread_fair() {
514	+	Semaphore s = new Semaphore(1, true);
515	+	try {
516	+	s.release(1);
517	+	s.acquire(1);
518	+	s.release(2);
519	+	s.acquire(2);
520	+	s.release(3);
521	+	s.acquire(3);
522	+	s.release(4);
523	+	s.acquire(4);
524	+	s.release(5);
525	+	s.acquire(5);
526	+	assertEquals(1, s.availablePermits());
527	+	} catch( InterruptedException e){
528	+	unexpectedException();
529	+	}
530	+	}
531	+
532	+	/**
533	+	* Acquire(n) and release(n) of semaphore succeed if initially available
534	+	*/
535	+	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
536	+	Semaphore s = new Semaphore(1, true);
537	+	try {
538	+	s.release(1);
539	+	s.acquireUninterruptibly(1);
540	+	s.release(2);
541	+	s.acquireUninterruptibly(2);
542	+	s.release(3);
543	+	s.acquireUninterruptibly(3);
544	+	s.release(4);
545	+	s.acquireUninterruptibly(4);
546	+	s.release(5);
547	+	s.acquireUninterruptibly(5);
548	+	assertEquals(1, s.availablePermits());
549	+	} finally {
550	+	}
551	+	}
552	+
553	+	/**
554	+	* release(n) in one thread enables timed acquire(n) in another thread
555	+	*/
556	+	public void testTimedAcquireReleaseNInSameThread_fair() {
557	+	Semaphore s = new Semaphore(1, true);
558	+	try {
559	+	s.release(1);
560	+	assertTrue(s.tryAcquire(1, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
561	+	s.release(2);
562	+	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
563	+	s.release(3);
564	+	assertTrue(s.tryAcquire(3, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
565	+	s.release(4);
566	+	assertTrue(s.tryAcquire(4, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
567	+	s.release(5);
568	+	assertTrue(s.tryAcquire(5, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
569	+	assertEquals(1, s.availablePermits());
570	+	} catch( InterruptedException e){
571	+	unexpectedException();
572	+	}
573	+	}
574	+
575	+	/**
576	+	* release in one thread enables timed acquire in another thread
577	+	*/
578	+	public void testTimedAcquireReleaseInSameThread_fair() {
579	+	Semaphore s = new Semaphore(1, true);
580	+	try {
581	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
582	+	s.release();
583	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
584	+	s.release();
585	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
586	+	s.release();
587	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
588	+	s.release();
589	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
590	+	s.release();
591	+	assertEquals(1, s.availablePermits());
592	+	} catch( InterruptedException e){
593	+	unexpectedException();
594	+	}
595	+	}
596	+
597	+	/**
598	+	* A release in one thread enables an acquire in another thread
599	+	*/
600	+	public void testAcquireReleaseInDifferentThreads_fair() {
601	+	final Semaphore s = new Semaphore(0, true);
602	+	Thread t = new Thread(new Runnable() {
603	+	public void run() {
604	+	try {
605	+	s.acquire();
606	+	s.acquire();
607	+	s.acquire();
608	+	s.acquire();
609	+	} catch(InterruptedException ie){
610	+	threadUnexpectedException();
611	+	}
612	+	}
613	+	});
614	+	try {
615	+	t.start();
616	+	Thread.sleep(SHORT_DELAY_MS);
617	+	s.release();
618	+	s.release();
619	+	s.release();
620	+	s.release();
621	+	s.release();
622	+	s.release();
623	+	t.join();
624	+	assertEquals(2, s.availablePermits());
625	+	} catch( InterruptedException e){
626	+	unexpectedException();
627	+	}
628	+	}
629	+
630	+	/**
631	+	* release(n) in one thread enables acquire(n) in another thread
632	+	*/
633	+	public void testAcquireReleaseNInDifferentThreads_fair() {
634	+	final Semaphore s = new Semaphore(0, true);
635	+	Thread t = new Thread(new Runnable() {
636	+	public void run() {
637	+	try {
638	+	s.acquire();
639	+	s.release(2);
640	+	s.acquire();
641	+	} catch(InterruptedException ie){
642	+	threadUnexpectedException();
643	+	}
644	+	}
645	+	});
646	+	try {
647	+	t.start();
648	+	Thread.sleep(SHORT_DELAY_MS);
649	+	s.release(2);
650	+	s.acquire(2);
651	+	s.release(1);
652	+	t.join();
653	+	} catch( InterruptedException e){
654	+	unexpectedException();
655	+	}
656	+	}
657	+
658	+	/**
659	+	* release(n) in one thread enables acquire(n) in another thread
660	+	*/
661	+	public void testAcquireReleaseNInDifferentThreads_fair2() {
662	+	final Semaphore s = new Semaphore(0, true);
663	+	Thread t = new Thread(new Runnable() {
664	+	public void run() {
665	+	try {
666	+	s.acquire(2);
667	+	s.acquire(2);
668	+	s.release(4);
669	+	} catch(InterruptedException ie){
670	+	threadUnexpectedException();
671	+	}
672	+	}
673	+	});
674	+	try {
675	+	t.start();
676	+	Thread.sleep(SHORT_DELAY_MS);
677	+	s.release(6);
678	+	s.acquire(2);
679	+	s.acquire(2);
680	+	s.release(2);
681	+	t.join();
682	+	} catch( InterruptedException e){
683	+	unexpectedException();
684	+	}
685	+	}
686	+
687	+
688	+
689	+
690	+
691	+	/**
692	+	* release in one thread enables timed acquire in another thread
693	+	*/
694	+	public void testTimedAcquireReleaseInDifferentThreads_fair() {
695	+	final Semaphore s = new Semaphore(1, true);
696	+	Thread t = new Thread(new Runnable() {
697	+	public void run() {
698	+	try {
699	+	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
700	+	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
701	+	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
702	+	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
703	+	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
704	+
705	+	} catch(InterruptedException ie){
706	+	threadUnexpectedException();
707	+	}
708	+	}
709	+	});
710	+	t.start();
711	+	try {
712	+	s.release();
713	+	s.release();
714	+	s.release();
715	+	s.release();
716	+	s.release();
717	+	t.join();
718	+	} catch( InterruptedException e){
719	+	unexpectedException();
720	+	}
721	+	}
722	+
723	+	/**
724	+	* release(n) in one thread enables timed acquire(n) in another thread
725	+	*/
726	+	public void testTimedAcquireReleaseNInDifferentThreads_fair() {
727	+	final Semaphore s = new Semaphore(2, true);
728	+	Thread t = new Thread(new Runnable() {
729	+	public void run() {
730	+	try {
731	+	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
732	+	s.release(2);
733	+	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
734	+	s.release(2);
735	+	} catch(InterruptedException ie){
736	+	threadUnexpectedException();
737	+	}
738	+	}
739	+	});
740	+	t.start();
741	+	try {
742	+	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
743	+	s.release(2);
744	+	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
745	+	s.release(2);
746	+	t.join();
747	+	} catch( InterruptedException e){
748	+	unexpectedException();
749	+	}
750	+	}
751	+
752	+	/**
753	+	* A waiting acquire blocks interruptibly
754	+	*/
755	+	public void testAcquire_InterruptedException_fair() {
756	+	final Semaphore s = new Semaphore(0, true);
757	+	Thread t = new Thread(new Runnable() {
758	+	public void run() {
759	+	try {
760	+	s.acquire();
761	+	threadShouldThrow();
762	+	} catch(InterruptedException success){}
763	+	}
764	+	});
765	+	t.start();
766	+	try {
767	+	Thread.sleep(SHORT_DELAY_MS);
768	+	t.interrupt();
769	+	t.join();
770	+	} catch(InterruptedException e){
771	+	unexpectedException();
772	+	}
773	+	}
774	+
775	+	/**
776	+	* A waiting acquire(n) blocks interruptibly
777	+	*/
778	+	public void testAcquireN_InterruptedException_fair() {
779	+	final Semaphore s = new Semaphore(2, true);
780	+	Thread t = new Thread(new Runnable() {
781	+	public void run() {
782	+	try {
783	+	s.acquire(3);
784	+	threadShouldThrow();
785	+	} catch(InterruptedException success){}
786	+	}
787	+	});
788	+	t.start();
789	+	try {
790	+	Thread.sleep(SHORT_DELAY_MS);
791	+	t.interrupt();
792	+	t.join();
793	+	} catch(InterruptedException e){
794	+	unexpectedException();
795	+	}
796	+	}
797	+
798	+	/**
799	+	*  A waiting tryAcquire blocks interruptibly
800	+	*/
801	+	public void testTryAcquire_InterruptedException_fair() {
802	+	final Semaphore s = new Semaphore(0, true);
803	+	Thread t = new Thread(new Runnable() {
804	+	public void run() {
805	+	try {
806	+	s.tryAcquire(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
807	+	threadShouldThrow();
808	+	} catch(InterruptedException success){
809	+	}
810	+	}
811	+	});
812	+	t.start();
813	+	try {
814	+	Thread.sleep(SHORT_DELAY_MS);
815	+	t.interrupt();
816	+	t.join();
817	+	} catch(InterruptedException e){
818	+	unexpectedException();
819	+	}
820	+	}
821	+
822	+	/**
823	+	*  A waiting tryAcquire(n) blocks interruptibly
824	+	*/
825	+	public void testTryAcquireN_InterruptedException_fair() {
826	+	final Semaphore s = new Semaphore(1, true);
827	+	Thread t = new Thread(new Runnable() {
828	+	public void run() {
829	+	try {
830	+	s.tryAcquire(4, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
831	+	threadShouldThrow();
832	+	} catch(InterruptedException success){
833	+	}
834	+	}
835	+	});
836	+	t.start();
837	+	try {
838	+	Thread.sleep(SHORT_DELAY_MS);
839	+	t.interrupt();
840	+	t.join();
841	+	} catch(InterruptedException e){
842	+	unexpectedException();
843	+	}
844	+	}
845	+
846	+	/**
847	+	* getQueueLength reports number of waiting threads
848	+	*/
849	+	public void testGetQueueLength_fair() {
850	+	final Semaphore lock = new Semaphore(1, true);
851	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
852	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
853	+	try {
854	+	assertEquals(0, lock.getQueueLength());
855	+	lock.acquireUninterruptibly();
856	+	t1.start();
857	+	Thread.sleep(SHORT_DELAY_MS);
858	+	assertEquals(1, lock.getQueueLength());
859	+	t2.start();
860	+	Thread.sleep(SHORT_DELAY_MS);
861	+	assertEquals(2, lock.getQueueLength());
862	+	t1.interrupt();
863	+	Thread.sleep(SHORT_DELAY_MS);
864	+	assertEquals(1, lock.getQueueLength());
865	+	lock.release();
866	+	Thread.sleep(SHORT_DELAY_MS);
867	+	assertEquals(0, lock.getQueueLength());
868	+	t1.join();
869	+	t2.join();
870	+	} catch(Exception e){
871	+	unexpectedException();
872	+	}
873	+	}
874	+
875	+
876	+	/**
877	+	* a deserialized serialized semaphore has same number of permits
878	+	*/
879	+	public void testSerialization_fair() {
880	+	Semaphore l = new Semaphore(3, true);
881	+
882	+	try {
883	+	l.acquire();
884	+	l.release();
885	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
886	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
887	+	out.writeObject(l);
888	+	out.close();
889	+
890	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
891	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
892	+	Semaphore r = (Semaphore) in.readObject();
893	+	assertEquals(3, r.availablePermits());
894	+	assertTrue(r.isFair());
895	+	r.acquire();
896	+	r.release();
897	+	} catch(Exception e){
898	+	unexpectedException();
899	+	}
900	+	}
901	+
902	+	/**
903	+	* toString indicates current number of permits
904	+	*/
905	+	public void testToString() {
906	+	Semaphore s = new Semaphore(0);
907	+	String us = s.toString();
908	+	assertTrue(us.indexOf("Permits = 0") >= 0);
909	+	s.release();
910	+	String s1 = s.toString();
911	+	assertTrue(s1.indexOf("Permits = 1") >= 0);
912	+	s.release();
913	+	String s2 = s.toString();
914	+	assertTrue(s2.indexOf("Permits = 2") >= 0);
915	+	}
916	+
917		}

Diff Legend

–	Removed lines
+	Added lines
<	Changed lines
>	Changed lines