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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 1.10 by dl, Fri Jan 2 00:38:47 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	+	/**
385	+	* reducePermits reduces number of permits
386	+	*/
387	+	public void testReducePermits() {
388	+	PublicSemaphore s = new PublicSemaphore(10, false);
389	+	assertEquals(10, s.availablePermits());
390	+	s.reducePermits(1);
391	+	assertEquals(9, s.availablePermits());
392	+	s.reducePermits(10);
393	+	assertEquals(-1, s.availablePermits());
394	+	}
395	+
396	+	/**
397		* a deserialized serialized semaphore has same number of permits
398		*/
399		public void testSerialization() {
400	<	Semaphore l = new Semaphore(3);
400	>	Semaphore l = new Semaphore(3, false);
401		try {
402		l.acquire();
403		l.release();
#	Line 263 | Line 410 | public class SemaphoreTest extends JSR16
410		ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
411		Semaphore r = (Semaphore) in.readObject();
412		assertEquals(3, r.availablePermits());
413	+	assertFalse(r.isFair());
414		r.acquire();
415		r.release();
416		} catch(Exception e){
#	Line 270 | Line 418 | public class SemaphoreTest extends JSR16
418		}
419		}
420
421	+
422	+	/**
423	+	* Zero, negative, and positive initial values are allowed in constructor
424	+	*/
425	+	public void testConstructor_fair() {
426	+	Semaphore s0 = new Semaphore(0, true);
427	+	assertEquals(0, s0.availablePermits());
428	+	assertTrue(s0.isFair());
429	+	Semaphore s1 = new Semaphore(-1, true);
430	+	assertEquals(-1, s1.availablePermits());
431	+	Semaphore s2 = new Semaphore(-1, true);
432	+	assertEquals(-1, s2.availablePermits());
433	+	}
434	+
435	+	/**
436	+	* tryAcquire succeeds when sufficient permits, else fails
437	+	*/
438	+	public void testTryAcquireInSameThread_fair() {
439	+	Semaphore s = new Semaphore(2, true);
440	+	assertEquals(2, s.availablePermits());
441	+	assertTrue(s.tryAcquire());
442	+	assertTrue(s.tryAcquire());
443	+	assertEquals(0, s.availablePermits());
444	+	assertFalse(s.tryAcquire());
445	+	}
446	+
447	+	/**
448	+	* tryAcquire(n) succeeds when sufficient permits, else fails
449	+	*/
450	+	public void testTryAcquireNInSameThread_fair() {
451	+	Semaphore s = new Semaphore(2, true);
452	+	assertEquals(2, s.availablePermits());
453	+	assertTrue(s.tryAcquire(2));
454	+	assertEquals(0, s.availablePermits());
455	+	assertFalse(s.tryAcquire());
456	+	}
457	+
458	+	/**
459	+	* Acquire and release of semaphore succeed if initially available
460	+	*/
461	+	public void testAcquireReleaseInSameThread_fair() {
462	+	Semaphore s = new Semaphore(1, true);
463	+	try {
464	+	s.acquire();
465	+	s.release();
466	+	s.acquire();
467	+	s.release();
468	+	s.acquire();
469	+	s.release();
470	+	s.acquire();
471	+	s.release();
472	+	s.acquire();
473	+	s.release();
474	+	assertEquals(1, s.availablePermits());
475	+	} catch( InterruptedException e){
476	+	unexpectedException();
477	+	}
478	+	}
479	+
480	+	/**
481	+	* Acquire(n) and release(n) of semaphore succeed if initially available
482	+	*/
483	+	public void testAcquireReleaseNInSameThread_fair() {
484	+	Semaphore s = new Semaphore(1, true);
485	+	try {
486	+	s.release(1);
487	+	s.acquire(1);
488	+	s.release(2);
489	+	s.acquire(2);
490	+	s.release(3);
491	+	s.acquire(3);
492	+	s.release(4);
493	+	s.acquire(4);
494	+	s.release(5);
495	+	s.acquire(5);
496	+	assertEquals(1, s.availablePermits());
497	+	} catch( InterruptedException e){
498	+	unexpectedException();
499	+	}
500	+	}
501	+
502	+	/**
503	+	* Acquire(n) and release(n) of semaphore succeed if initially available
504	+	*/
505	+	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
506	+	Semaphore s = new Semaphore(1, true);
507	+	try {
508	+	s.release(1);
509	+	s.acquireUninterruptibly(1);
510	+	s.release(2);
511	+	s.acquireUninterruptibly(2);
512	+	s.release(3);
513	+	s.acquireUninterruptibly(3);
514	+	s.release(4);
515	+	s.acquireUninterruptibly(4);
516	+	s.release(5);
517	+	s.acquireUninterruptibly(5);
518	+	assertEquals(1, s.availablePermits());
519	+	} finally {
520	+	}
521	+	}
522	+
523	+	/**
524	+	* release(n) in one thread enables timed acquire(n) in another thread
525	+	*/
526	+	public void testTimedAcquireReleaseNInSameThread_fair() {
527	+	Semaphore s = new Semaphore(1, true);
528	+	try {
529	+	s.release(1);
530	+	assertTrue(s.tryAcquire(1, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
531	+	s.release(2);
532	+	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
533	+	s.release(3);
534	+	assertTrue(s.tryAcquire(3, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
535	+	s.release(4);
536	+	assertTrue(s.tryAcquire(4, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
537	+	s.release(5);
538	+	assertTrue(s.tryAcquire(5, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
539	+	assertEquals(1, s.availablePermits());
540	+	} catch( InterruptedException e){
541	+	unexpectedException();
542	+	}
543	+	}
544	+
545	+	/**
546	+	* release in one thread enables timed acquire in another thread
547	+	*/
548	+	public void testTimedAcquireReleaseInSameThread_fair() {
549	+	Semaphore s = new Semaphore(1, true);
550	+	try {
551	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
552	+	s.release();
553	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
554	+	s.release();
555	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
556	+	s.release();
557	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
558	+	s.release();
559	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
560	+	s.release();
561	+	assertEquals(1, s.availablePermits());
562	+	} catch( InterruptedException e){
563	+	unexpectedException();
564	+	}
565	+	}
566	+
567	+	/**
568	+	* A release in one thread enables an acquire in another thread
569	+	*/
570	+	public void testAcquireReleaseInDifferentThreads_fair() {
571	+	final Semaphore s = new Semaphore(0, true);
572	+	Thread t = new Thread(new Runnable() {
573	+	public void run() {
574	+	try {
575	+	s.acquire();
576	+	s.acquire();
577	+	s.acquire();
578	+	s.acquire();
579	+	} catch(InterruptedException ie){
580	+	threadUnexpectedException();
581	+	}
582	+	}
583	+	});
584	+	try {
585	+	t.start();
586	+	Thread.sleep(SHORT_DELAY_MS);
587	+	s.release();
588	+	s.release();
589	+	s.release();
590	+	s.release();
591	+	s.release();
592	+	s.release();
593	+	t.join();
594	+	assertEquals(2, s.availablePermits());
595	+	} catch( InterruptedException e){
596	+	unexpectedException();
597	+	}
598	+	}
599	+
600	+	/**
601	+	* release(n) in one thread enables acquire(n) in another thread
602	+	*/
603	+	public void testAcquireReleaseNInDifferentThreads_fair() {
604	+	final Semaphore s = new Semaphore(0, true);
605	+	Thread t = new Thread(new Runnable() {
606	+	public void run() {
607	+	try {
608	+	s.acquire();
609	+	s.release();
610	+	s.release();
611	+	s.acquire();
612	+	} catch(InterruptedException ie){
613	+	threadUnexpectedException();
614	+	}
615	+	}
616	+	});
617	+	try {
618	+	t.start();
619	+	Thread.sleep(SHORT_DELAY_MS);
620	+	s.release();
621	+	s.release();
622	+	s.acquire();
623	+	s.acquire();
624	+	s.release();
625	+	t.join();
626	+	} catch( InterruptedException e){
627	+	unexpectedException();
628	+	}
629	+	}
630	+
631	+
632	+
633	+	/**
634	+	* release in one thread enables timed acquire in another thread
635	+	*/
636	+	public void testTimedAcquireReleaseInDifferentThreads_fair() {
637	+	final Semaphore s = new Semaphore(1, true);
638	+	Thread t = new Thread(new Runnable() {
639	+	public void run() {
640	+	try {
641	+	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
642	+	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
643	+	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
644	+	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
645	+	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
646	+
647	+	} catch(InterruptedException ie){
648	+	threadUnexpectedException();
649	+	}
650	+	}
651	+	});
652	+	t.start();
653	+	try {
654	+	s.release();
655	+	s.release();
656	+	s.release();
657	+	s.release();
658	+	s.release();
659	+	t.join();
660	+	} catch( InterruptedException e){
661	+	unexpectedException();
662	+	}
663	+	}
664	+
665	+	/**
666	+	* release(n) in one thread enables timed acquire(n) in another thread
667	+	*/
668	+	public void testTimedAcquireReleaseNInDifferentThreads_fair() {
669	+	final Semaphore s = new Semaphore(2, true);
670	+	Thread t = new Thread(new Runnable() {
671	+	public void run() {
672	+	try {
673	+	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
674	+	s.release(2);
675	+	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
676	+	s.release(2);
677	+	} catch(InterruptedException ie){
678	+	threadUnexpectedException();
679	+	}
680	+	}
681	+	});
682	+	t.start();
683	+	try {
684	+	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
685	+	s.release(2);
686	+	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
687	+	s.release(2);
688	+	t.join();
689	+	} catch( InterruptedException e){
690	+	unexpectedException();
691	+	}
692	+	}
693	+
694	+	/**
695	+	* A waiting acquire blocks interruptibly
696	+	*/
697	+	public void testAcquire_InterruptedException_fair() {
698	+	final Semaphore s = new Semaphore(0, true);
699	+	Thread t = new Thread(new Runnable() {
700	+	public void run() {
701	+	try {
702	+	s.acquire();
703	+	threadShouldThrow();
704	+	} catch(InterruptedException success){}
705	+	}
706	+	});
707	+	t.start();
708	+	try {
709	+	Thread.sleep(SHORT_DELAY_MS);
710	+	t.interrupt();
711	+	t.join();
712	+	} catch(InterruptedException e){
713	+	unexpectedException();
714	+	}
715	+	}
716	+
717	+	/**
718	+	* A waiting acquire(n) blocks interruptibly
719	+	*/
720	+	public void testAcquireN_InterruptedException_fair() {
721	+	final Semaphore s = new Semaphore(2, true);
722	+	Thread t = new Thread(new Runnable() {
723	+	public void run() {
724	+	try {
725	+	s.acquire(3);
726	+	threadShouldThrow();
727	+	} catch(InterruptedException success){}
728	+	}
729	+	});
730	+	t.start();
731	+	try {
732	+	Thread.sleep(SHORT_DELAY_MS);
733	+	t.interrupt();
734	+	t.join();
735	+	} catch(InterruptedException e){
736	+	unexpectedException();
737	+	}
738	+	}
739	+
740	+	/**
741	+	*  A waiting tryAcquire blocks interruptibly
742	+	*/
743	+	public void testTryAcquire_InterruptedException_fair() {
744	+	final Semaphore s = new Semaphore(0, true);
745	+	Thread t = new Thread(new Runnable() {
746	+	public void run() {
747	+	try {
748	+	s.tryAcquire(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
749	+	threadShouldThrow();
750	+	} catch(InterruptedException success){
751	+	}
752	+	}
753	+	});
754	+	t.start();
755	+	try {
756	+	Thread.sleep(SHORT_DELAY_MS);
757	+	t.interrupt();
758	+	t.join();
759	+	} catch(InterruptedException e){
760	+	unexpectedException();
761	+	}
762	+	}
763	+
764	+	/**
765	+	*  A waiting tryAcquire(n) blocks interruptibly
766	+	*/
767	+	public void testTryAcquireN_InterruptedException_fair() {
768	+	final Semaphore s = new Semaphore(1, true);
769	+	Thread t = new Thread(new Runnable() {
770	+	public void run() {
771	+	try {
772	+	s.tryAcquire(4, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
773	+	threadShouldThrow();
774	+	} catch(InterruptedException success){
775	+	}
776	+	}
777	+	});
778	+	t.start();
779	+	try {
780	+	Thread.sleep(SHORT_DELAY_MS);
781	+	t.interrupt();
782	+	t.join();
783	+	} catch(InterruptedException e){
784	+	unexpectedException();
785	+	}
786	+	}
787	+
788	+	/**
789	+	* getQueueLength reports number of waiting threads
790	+	*/
791	+	public void testGetQueueLength_fair() {
792	+	final Semaphore lock = new Semaphore(1, true);
793	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
794	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
795	+	try {
796	+	assertEquals(0, lock.getQueueLength());
797	+	lock.acquireUninterruptibly();
798	+	t1.start();
799	+	Thread.sleep(SHORT_DELAY_MS);
800	+	assertEquals(1, lock.getQueueLength());
801	+	t2.start();
802	+	Thread.sleep(SHORT_DELAY_MS);
803	+	assertEquals(2, lock.getQueueLength());
804	+	t1.interrupt();
805	+	Thread.sleep(SHORT_DELAY_MS);
806	+	assertEquals(1, lock.getQueueLength());
807	+	lock.release();
808	+	Thread.sleep(SHORT_DELAY_MS);
809	+	assertEquals(0, lock.getQueueLength());
810	+	t1.join();
811	+	t2.join();
812	+	} catch(Exception e){
813	+	unexpectedException();
814	+	}
815	+	}
816	+
817	+
818	+	/**
819	+	* a deserialized serialized semaphore has same number of permits
820	+	*/
821	+	public void testSerialization_fair() {
822	+	Semaphore l = new Semaphore(3, true);
823	+
824	+	try {
825	+	l.acquire();
826	+	l.release();
827	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
828	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
829	+	out.writeObject(l);
830	+	out.close();
831	+
832	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
833	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
834	+	Semaphore r = (Semaphore) in.readObject();
835	+	assertEquals(3, r.availablePermits());
836	+	assertTrue(r.isFair());
837	+	r.acquire();
838	+	r.release();
839	+	} catch(Exception e){
840	+	unexpectedException();
841	+	}
842	+	}
843	+
844	+
845		}

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