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 1.11 by dl, Sun Jan 4 00:57:21 2004 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 19 | Line 20 | public class SemaphoreTest extends JSR16
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);
68	>	Semaphore s0 = new Semaphore(0, false);
69		assertEquals(0, s0.availablePermits());
70	<	Semaphore s1 = new Semaphore(-1);
70	>	assertFalse(s0.isFair());
71	>	Semaphore s1 = new Semaphore(-1, false);
72		assertEquals(-1, s1.availablePermits());
73	<	Semaphore s2 = new Semaphore(-1);
73	>	Semaphore s2 = new Semaphore(-1, false);
74		assertEquals(-1, s2.availablePermits());
75		}
76
77		/**
78	<	* tryAcquire succeeds when sufficent permits, else fails
78	>	* tryAcquire succeeds when sufficient permits, else fails
79		*/
80		public void testTryAcquireInSameThread() {
81	<	Semaphore s = new Semaphore(2);
81	>	Semaphore s = new Semaphore(2, false);
82		assertEquals(2, s.availablePermits());
83		assertTrue(s.tryAcquire());
84		assertTrue(s.tryAcquire());
#	Line 46 | Line 90 | public class SemaphoreTest extends JSR16
90		* Acquire and release of semaphore succeed if initially available
91		*/
92		public void testAcquireReleaseInSameThread() {
93	<	Semaphore s = new Semaphore(1);
93	>	Semaphore s = new Semaphore(1, false);
94		try {
95		s.acquire();
96		s.release();
#	Line 69 | Line 113 | public class SemaphoreTest extends JSR16
113		* initially available
114		*/
115		public void testAcquireUninterruptiblyReleaseInSameThread() {
116	<	Semaphore s = new Semaphore(1);
116	>	Semaphore s = new Semaphore(1, false);
117		try {
118		s.acquireUninterruptibly();
119		s.release();
#	Line 91 | Line 135 | public class SemaphoreTest extends JSR16
135		* initially available
136		*/
137		public void testTimedAcquireReleaseInSameThread() {
138	<	Semaphore s = new Semaphore(1);
138	>	Semaphore s = new Semaphore(1, false);
139		try {
140		assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
141		s.release();
#	Line 113 | Line 157 | public class SemaphoreTest extends JSR16
157		* A release in one thread enables an acquire in another thread
158		*/
159		public void testAcquireReleaseInDifferentThreads() {
160	<	final Semaphore s = new Semaphore(0);
160	>	final Semaphore s = new Semaphore(0, false);
161		Thread t = new Thread(new Runnable() {
162		public void run() {
163		try {
#	Line 144 | Line 188 | public class SemaphoreTest extends JSR16
188		* A release in one thread enables an uninterruptible acquire in another thread
189		*/
190		public void testUninterruptibleAcquireReleaseInDifferentThreads() {
191	<	final Semaphore s = new Semaphore(0);
191	>	final Semaphore s = new Semaphore(0, false);
192		Thread t = new Thread(new Runnable() {
193		public void run() {
194		s.acquireUninterruptibly();
#	Line 172 | Line 216 | public class SemaphoreTest extends JSR16
216		*  A release in one thread enables a timed acquire in another thread
217		*/
218		public void testTimedAcquireReleaseInDifferentThreads() {
219	<	final Semaphore s = new Semaphore(1);
219	>	final Semaphore s = new Semaphore(1, false);
220		Thread t = new Thread(new Runnable() {
221		public void run() {
222		try {
#	Line 203 | Line 247 | public class SemaphoreTest extends JSR16
247		* A waiting acquire blocks interruptibly
248		*/
249		public void testAcquire_InterruptedException() {
250	<	final Semaphore s = new Semaphore(0);
250	>	final Semaphore s = new Semaphore(0, false);
251		Thread t = new Thread(new Runnable() {
252		public void run() {
253		try {
#	Line 226 | Line 270 | public class SemaphoreTest extends JSR16
270		*  A waiting timed acquire blocks interruptibly
271		*/
272		public void testTryAcquire_InterruptedException() {
273	<	final Semaphore s = new Semaphore(0);
273	>	final Semaphore s = new Semaphore(0, false);
274		Thread t = new Thread(new Runnable() {
275		public void run() {
276		try {
#	Line 247 | Line 291 | public class SemaphoreTest extends JSR16
291		}
292
293		/**
294	+	* hasQueuedThreads reports whether there are waiting threads
295	+	*/
296	+	public void testHasQueuedThreads() {
297	+	final Semaphore lock = new Semaphore(1, false);
298	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
299	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
300	+	try {
301	+	assertFalse(lock.hasQueuedThreads());
302	+	lock.acquireUninterruptibly();
303	+	t1.start();
304	+	Thread.sleep(SHORT_DELAY_MS);
305	+	assertTrue(lock.hasQueuedThreads());
306	+	t2.start();
307	+	Thread.sleep(SHORT_DELAY_MS);
308	+	assertTrue(lock.hasQueuedThreads());
309	+	t1.interrupt();
310	+	Thread.sleep(SHORT_DELAY_MS);
311	+	assertTrue(lock.hasQueuedThreads());
312	+	lock.release();
313	+	Thread.sleep(SHORT_DELAY_MS);
314	+	assertFalse(lock.hasQueuedThreads());
315	+	t1.join();
316	+	t2.join();
317	+	} catch(Exception e){
318	+	unexpectedException();
319	+	}
320	+	}
321	+
322	+	/**
323	+	* getQueueLength reports number of waiting threads
324	+	*/
325	+	public void testGetQueueLength() {
326	+	final Semaphore lock = new Semaphore(1, false);
327	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
328	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
329	+	try {
330	+	assertEquals(0, lock.getQueueLength());
331	+	lock.acquireUninterruptibly();
332	+	t1.start();
333	+	Thread.sleep(SHORT_DELAY_MS);
334	+	assertEquals(1, lock.getQueueLength());
335	+	t2.start();
336	+	Thread.sleep(SHORT_DELAY_MS);
337	+	assertEquals(2, lock.getQueueLength());
338	+	t1.interrupt();
339	+	Thread.sleep(SHORT_DELAY_MS);
340	+	assertEquals(1, lock.getQueueLength());
341	+	lock.release();
342	+	Thread.sleep(SHORT_DELAY_MS);
343	+	assertEquals(0, lock.getQueueLength());
344	+	t1.join();
345	+	t2.join();
346	+	} catch(Exception e){
347	+	unexpectedException();
348	+	}
349	+	}
350	+
351	+	/**
352	+	* getQueuedThreads includes waiting threads
353	+	*/
354	+	public void testGetQueuedThreads() {
355	+	final PublicSemaphore lock = new PublicSemaphore(1, false);
356	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
357	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
358	+	try {
359	+	assertTrue(lock.getQueuedThreads().isEmpty());
360	+	lock.acquireUninterruptibly();
361	+	assertTrue(lock.getQueuedThreads().isEmpty());
362	+	t1.start();
363	+	Thread.sleep(SHORT_DELAY_MS);
364	+	assertTrue(lock.getQueuedThreads().contains(t1));
365	+	t2.start();
366	+	Thread.sleep(SHORT_DELAY_MS);
367	+	assertTrue(lock.getQueuedThreads().contains(t1));
368	+	assertTrue(lock.getQueuedThreads().contains(t2));
369	+	t1.interrupt();
370	+	Thread.sleep(SHORT_DELAY_MS);
371	+	assertFalse(lock.getQueuedThreads().contains(t1));
372	+	assertTrue(lock.getQueuedThreads().contains(t2));
373	+	lock.release();
374	+	Thread.sleep(SHORT_DELAY_MS);
375	+	assertTrue(lock.getQueuedThreads().isEmpty());
376	+	t1.join();
377	+	t2.join();
378	+	} catch(Exception e){
379	+	unexpectedException();
380	+	}
381	+	}
382	+
383	+	/**
384	+	* drainPermits reports and removes given number of permits
385	+	*/
386	+	public void testDrainPermits() {
387	+	Semaphore s = new Semaphore(0, false);
388	+	assertEquals(0, s.availablePermits());
389	+	assertEquals(0, s.drainPermits());
390	+	s.release(10);
391	+	assertEquals(10, s.availablePermits());
392	+	assertEquals(10, s.drainPermits());
393	+	assertEquals(0, s.availablePermits());
394	+	assertEquals(0, s.drainPermits());
395	+	}
396	+
397	+	/**
398	+	* reducePermits reduces number of permits
399	+	*/
400	+	public void testReducePermits() {
401	+	PublicSemaphore s = new PublicSemaphore(10, false);
402	+	assertEquals(10, s.availablePermits());
403	+	s.reducePermits(1);
404	+	assertEquals(9, s.availablePermits());
405	+	s.reducePermits(10);
406	+	assertEquals(-1, s.availablePermits());
407	+	}
408	+
409	+	/**
410		* a deserialized serialized semaphore has same number of permits
411		*/
412		public void testSerialization() {
413	<	Semaphore l = new Semaphore(3);
413	>	Semaphore l = new Semaphore(3, false);
414		try {
415		l.acquire();
416		l.release();
#	Line 263 | Line 423 | public class SemaphoreTest extends JSR16
423		ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
424		Semaphore r = (Semaphore) in.readObject();
425		assertEquals(3, r.availablePermits());
426	+	assertFalse(r.isFair());
427		r.acquire();
428		r.release();
429		} catch(Exception e){
#	Line 270 | Line 431 | public class SemaphoreTest extends JSR16
431		}
432		}
433
434	+
435	+	/**
436	+	* Zero, negative, and positive initial values are allowed in constructor
437	+	*/
438	+	public void testConstructor_fair() {
439	+	Semaphore s0 = new Semaphore(0, true);
440	+	assertEquals(0, s0.availablePermits());
441	+	assertTrue(s0.isFair());
442	+	Semaphore s1 = new Semaphore(-1, true);
443	+	assertEquals(-1, s1.availablePermits());
444	+	Semaphore s2 = new Semaphore(-1, true);
445	+	assertEquals(-1, s2.availablePermits());
446	+	}
447	+
448	+	/**
449	+	* tryAcquire succeeds when sufficient permits, else fails
450	+	*/
451	+	public void testTryAcquireInSameThread_fair() {
452	+	Semaphore s = new Semaphore(2, true);
453	+	assertEquals(2, s.availablePermits());
454	+	assertTrue(s.tryAcquire());
455	+	assertTrue(s.tryAcquire());
456	+	assertEquals(0, s.availablePermits());
457	+	assertFalse(s.tryAcquire());
458	+	}
459	+
460	+	/**
461	+	* tryAcquire(n) succeeds when sufficient permits, else fails
462	+	*/
463	+	public void testTryAcquireNInSameThread_fair() {
464	+	Semaphore s = new Semaphore(2, true);
465	+	assertEquals(2, s.availablePermits());
466	+	assertTrue(s.tryAcquire(2));
467	+	assertEquals(0, s.availablePermits());
468	+	assertFalse(s.tryAcquire());
469	+	}
470	+
471	+	/**
472	+	* Acquire and release of semaphore succeed if initially available
473	+	*/
474	+	public void testAcquireReleaseInSameThread_fair() {
475	+	Semaphore s = new Semaphore(1, true);
476	+	try {
477	+	s.acquire();
478	+	s.release();
479	+	s.acquire();
480	+	s.release();
481	+	s.acquire();
482	+	s.release();
483	+	s.acquire();
484	+	s.release();
485	+	s.acquire();
486	+	s.release();
487	+	assertEquals(1, s.availablePermits());
488	+	} catch( InterruptedException e){
489	+	unexpectedException();
490	+	}
491	+	}
492	+
493	+	/**
494	+	* Acquire(n) and release(n) of semaphore succeed if initially available
495	+	*/
496	+	public void testAcquireReleaseNInSameThread_fair() {
497	+	Semaphore s = new Semaphore(1, true);
498	+	try {
499	+	s.release(1);
500	+	s.acquire(1);
501	+	s.release(2);
502	+	s.acquire(2);
503	+	s.release(3);
504	+	s.acquire(3);
505	+	s.release(4);
506	+	s.acquire(4);
507	+	s.release(5);
508	+	s.acquire(5);
509	+	assertEquals(1, s.availablePermits());
510	+	} catch( InterruptedException e){
511	+	unexpectedException();
512	+	}
513	+	}
514	+
515	+	/**
516	+	* Acquire(n) and release(n) of semaphore succeed if initially available
517	+	*/
518	+	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
519	+	Semaphore s = new Semaphore(1, true);
520	+	try {
521	+	s.release(1);
522	+	s.acquireUninterruptibly(1);
523	+	s.release(2);
524	+	s.acquireUninterruptibly(2);
525	+	s.release(3);
526	+	s.acquireUninterruptibly(3);
527	+	s.release(4);
528	+	s.acquireUninterruptibly(4);
529	+	s.release(5);
530	+	s.acquireUninterruptibly(5);
531	+	assertEquals(1, s.availablePermits());
532	+	} finally {
533	+	}
534	+	}
535	+
536	+	/**
537	+	* release(n) in one thread enables timed acquire(n) in another thread
538	+	*/
539	+	public void testTimedAcquireReleaseNInSameThread_fair() {
540	+	Semaphore s = new Semaphore(1, true);
541	+	try {
542	+	s.release(1);
543	+	assertTrue(s.tryAcquire(1, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
544	+	s.release(2);
545	+	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
546	+	s.release(3);
547	+	assertTrue(s.tryAcquire(3, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
548	+	s.release(4);
549	+	assertTrue(s.tryAcquire(4, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
550	+	s.release(5);
551	+	assertTrue(s.tryAcquire(5, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
552	+	assertEquals(1, s.availablePermits());
553	+	} catch( InterruptedException e){
554	+	unexpectedException();
555	+	}
556	+	}
557	+
558	+	/**
559	+	* release in one thread enables timed acquire in another thread
560	+	*/
561	+	public void testTimedAcquireReleaseInSameThread_fair() {
562	+	Semaphore s = new Semaphore(1, true);
563	+	try {
564	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
565	+	s.release();
566	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
567	+	s.release();
568	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
569	+	s.release();
570	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
571	+	s.release();
572	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
573	+	s.release();
574	+	assertEquals(1, s.availablePermits());
575	+	} catch( InterruptedException e){
576	+	unexpectedException();
577	+	}
578	+	}
579	+
580	+	/**
581	+	* A release in one thread enables an acquire in another thread
582	+	*/
583	+	public void testAcquireReleaseInDifferentThreads_fair() {
584	+	final Semaphore s = new Semaphore(0, true);
585	+	Thread t = new Thread(new Runnable() {
586	+	public void run() {
587	+	try {
588	+	s.acquire();
589	+	s.acquire();
590	+	s.acquire();
591	+	s.acquire();
592	+	} catch(InterruptedException ie){
593	+	threadUnexpectedException();
594	+	}
595	+	}
596	+	});
597	+	try {
598	+	t.start();
599	+	Thread.sleep(SHORT_DELAY_MS);
600	+	s.release();
601	+	s.release();
602	+	s.release();
603	+	s.release();
604	+	s.release();
605	+	s.release();
606	+	t.join();
607	+	assertEquals(2, s.availablePermits());
608	+	} catch( InterruptedException e){
609	+	unexpectedException();
610	+	}
611	+	}
612	+
613	+	/**
614	+	* release(n) in one thread enables acquire(n) in another thread
615	+	*/
616	+	public void testAcquireReleaseNInDifferentThreads_fair() {
617	+	final Semaphore s = new Semaphore(0, true);
618	+	Thread t = new Thread(new Runnable() {
619	+	public void run() {
620	+	try {
621	+	s.acquire();
622	+	s.release(2);
623	+	s.acquire();
624	+	} catch(InterruptedException ie){
625	+	threadUnexpectedException();
626	+	}
627	+	}
628	+	});
629	+	try {
630	+	t.start();
631	+	Thread.sleep(SHORT_DELAY_MS);
632	+	s.release(2);
633	+	s.acquire(2);
634	+	s.release(1);
635	+	t.join();
636	+	} catch( InterruptedException e){
637	+	unexpectedException();
638	+	}
639	+	}
640	+
641	+
642	+
643	+	/**
644	+	* release in one thread enables timed acquire in another thread
645	+	*/
646	+	public void testTimedAcquireReleaseInDifferentThreads_fair() {
647	+	final Semaphore s = new Semaphore(1, true);
648	+	Thread t = new Thread(new Runnable() {
649	+	public void run() {
650	+	try {
651	+	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
652	+	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
653	+	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
654	+	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
655	+	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
656	+
657	+	} catch(InterruptedException ie){
658	+	threadUnexpectedException();
659	+	}
660	+	}
661	+	});
662	+	t.start();
663	+	try {
664	+	s.release();
665	+	s.release();
666	+	s.release();
667	+	s.release();
668	+	s.release();
669	+	t.join();
670	+	} catch( InterruptedException e){
671	+	unexpectedException();
672	+	}
673	+	}
674	+
675	+	/**
676	+	* release(n) in one thread enables timed acquire(n) in another thread
677	+	*/
678	+	public void testTimedAcquireReleaseNInDifferentThreads_fair() {
679	+	final Semaphore s = new Semaphore(2, true);
680	+	Thread t = new Thread(new Runnable() {
681	+	public void run() {
682	+	try {
683	+	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
684	+	s.release(2);
685	+	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
686	+	s.release(2);
687	+	} catch(InterruptedException ie){
688	+	threadUnexpectedException();
689	+	}
690	+	}
691	+	});
692	+	t.start();
693	+	try {
694	+	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
695	+	s.release(2);
696	+	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
697	+	s.release(2);
698	+	t.join();
699	+	} catch( InterruptedException e){
700	+	unexpectedException();
701	+	}
702	+	}
703	+
704	+	/**
705	+	* A waiting acquire blocks interruptibly
706	+	*/
707	+	public void testAcquire_InterruptedException_fair() {
708	+	final Semaphore s = new Semaphore(0, true);
709	+	Thread t = new Thread(new Runnable() {
710	+	public void run() {
711	+	try {
712	+	s.acquire();
713	+	threadShouldThrow();
714	+	} catch(InterruptedException success){}
715	+	}
716	+	});
717	+	t.start();
718	+	try {
719	+	Thread.sleep(SHORT_DELAY_MS);
720	+	t.interrupt();
721	+	t.join();
722	+	} catch(InterruptedException e){
723	+	unexpectedException();
724	+	}
725	+	}
726	+
727	+	/**
728	+	* A waiting acquire(n) blocks interruptibly
729	+	*/
730	+	public void testAcquireN_InterruptedException_fair() {
731	+	final Semaphore s = new Semaphore(2, true);
732	+	Thread t = new Thread(new Runnable() {
733	+	public void run() {
734	+	try {
735	+	s.acquire(3);
736	+	threadShouldThrow();
737	+	} catch(InterruptedException success){}
738	+	}
739	+	});
740	+	t.start();
741	+	try {
742	+	Thread.sleep(SHORT_DELAY_MS);
743	+	t.interrupt();
744	+	t.join();
745	+	} catch(InterruptedException e){
746	+	unexpectedException();
747	+	}
748	+	}
749	+
750	+	/**
751	+	*  A waiting tryAcquire blocks interruptibly
752	+	*/
753	+	public void testTryAcquire_InterruptedException_fair() {
754	+	final Semaphore s = new Semaphore(0, true);
755	+	Thread t = new Thread(new Runnable() {
756	+	public void run() {
757	+	try {
758	+	s.tryAcquire(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
759	+	threadShouldThrow();
760	+	} catch(InterruptedException success){
761	+	}
762	+	}
763	+	});
764	+	t.start();
765	+	try {
766	+	Thread.sleep(SHORT_DELAY_MS);
767	+	t.interrupt();
768	+	t.join();
769	+	} catch(InterruptedException e){
770	+	unexpectedException();
771	+	}
772	+	}
773	+
774	+	/**
775	+	*  A waiting tryAcquire(n) blocks interruptibly
776	+	*/
777	+	public void testTryAcquireN_InterruptedException_fair() {
778	+	final Semaphore s = new Semaphore(1, true);
779	+	Thread t = new Thread(new Runnable() {
780	+	public void run() {
781	+	try {
782	+	s.tryAcquire(4, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
783	+	threadShouldThrow();
784	+	} catch(InterruptedException success){
785	+	}
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	+	* getQueueLength reports number of waiting threads
800	+	*/
801	+	public void testGetQueueLength_fair() {
802	+	final Semaphore lock = new Semaphore(1, true);
803	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
804	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
805	+	try {
806	+	assertEquals(0, lock.getQueueLength());
807	+	lock.acquireUninterruptibly();
808	+	t1.start();
809	+	Thread.sleep(SHORT_DELAY_MS);
810	+	assertEquals(1, lock.getQueueLength());
811	+	t2.start();
812	+	Thread.sleep(SHORT_DELAY_MS);
813	+	assertEquals(2, lock.getQueueLength());
814	+	t1.interrupt();
815	+	Thread.sleep(SHORT_DELAY_MS);
816	+	assertEquals(1, lock.getQueueLength());
817	+	lock.release();
818	+	Thread.sleep(SHORT_DELAY_MS);
819	+	assertEquals(0, lock.getQueueLength());
820	+	t1.join();
821	+	t2.join();
822	+	} catch(Exception e){
823	+	unexpectedException();
824	+	}
825	+	}
826	+
827	+
828	+	/**
829	+	* a deserialized serialized semaphore has same number of permits
830	+	*/
831	+	public void testSerialization_fair() {
832	+	Semaphore l = new Semaphore(3, true);
833	+
834	+	try {
835	+	l.acquire();
836	+	l.release();
837	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
838	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
839	+	out.writeObject(l);
840	+	out.close();
841	+
842	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
843	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
844	+	Semaphore r = (Semaphore) in.readObject();
845	+	assertEquals(3, r.availablePermits());
846	+	assertTrue(r.isFair());
847	+	r.acquire();
848	+	r.release();
849	+	} catch(Exception e){
850	+	unexpectedException();
851	+	}
852	+	}
853	+
854	+
855		}

Diff Legend

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