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

Comparing jsr166/src/test/tck/SemaphoreTest.java (file contents):
Revision 1.3 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.8 by dl, Sun Dec 28 21:56:18 2003 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 11 | Line 12 | import java.util.concurrent.*;
12		import java.io.*;
13
14		public class SemaphoreTest extends JSR166TestCase {
14	–
15		public static void main(String[] args) {
16		junit.textui.TestRunner.run (suite());
17		}
18	–
18		public static Test suite() {
19		return new TestSuite(SemaphoreTest.class);
20		}
21
22	<	public void testConstructor1() {
23	<	Semaphore s = new Semaphore(0);
24	<	assertEquals(0, s.availablePermits());
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	<	public void testConstructor2() {
36	<	Semaphore s = new Semaphore(-1);
37	<	assertEquals(-1, s.availablePermits());
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	+	Semaphore s2 = new Semaphore(-1, false);
74	+	assertEquals(-1, s2.availablePermits());
75	+	}
76	+
77	+	/**
78	+	* tryAcquire succeeds when sufficent 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 39 | Line 86 | public class SemaphoreTest extends JSR16
86		assertFalse(s.tryAcquire());
87		}
88
89	<	public void testAcquireReleaseInSameThread(){
90	<	Semaphore s = new Semaphore(1);
89	>	/**
90	>	* Acquire and release of semaphore succeed if initially available
91	>	*/
92	>	public void testAcquireReleaseInSameThread() {
93	>	Semaphore s = new Semaphore(1, false);
94		try {
95		s.acquire();
96		s.release();
#	Line 54 | Line 104 | public class SemaphoreTest extends JSR16
104		s.release();
105		assertEquals(1, s.availablePermits());
106		} catch( InterruptedException e){
107	<	fail("unexpected exception");
107	>	unexpectedException();
108		}
109		}
110
111	<	public void testAcquireUninterruptiblyReleaseInSameThread(){
112	<	Semaphore s = new Semaphore(1);
111	>	/**
112	>	* Uninterruptible acquire and release of semaphore succeed if
113	>	* initially available
114	>	*/
115	>	public void testAcquireUninterruptiblyReleaseInSameThread() {
116	>	Semaphore s = new Semaphore(1, false);
117		try {
118		s.acquireUninterruptibly();
119		s.release();
#	Line 76 | Line 130 | public class SemaphoreTest extends JSR16
130		}
131		}
132
133	+	/**
134	+	* Timed Acquire and release of semaphore succeed if
135	+	* initially available
136	+	*/
137	+	public void testTimedAcquireReleaseInSameThread() {
138	+	Semaphore s = new Semaphore(1, false);
139	+	try {
140	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
141	+	s.release();
142	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
143	+	s.release();
144	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
145	+	s.release();
146	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
147	+	s.release();
148	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
149	+	s.release();
150	+	assertEquals(1, s.availablePermits());
151	+	} catch( InterruptedException e){
152	+	unexpectedException();
153	+	}
154	+	}
155
156	+	/**
157	+	* A release in one thread enables an acquire in another thread
158	+	*/
159		public void testAcquireReleaseInDifferentThreads() {
160	<	final Semaphore s = new Semaphore(1);
161	<	Thread t = new Thread(new Runnable(){
162	<	public void run(){
163	<	try{
160	>	final Semaphore s = new Semaphore(0, false);
161	>	Thread t = new Thread(new Runnable() {
162	>	public void run() {
163	>	try {
164		s.acquire();
165		s.release();
166		s.release();
167		s.acquire();
168	<	}catch(InterruptedException ie){
169	<	threadFail("unexpected exception");
168	>	} catch(InterruptedException ie){
169	>	threadUnexpectedException();
170		}
171		}
172		});
94	–	t.start();
173		try {
174	+	t.start();
175	+	Thread.sleep(SHORT_DELAY_MS);
176		s.release();
177		s.release();
178		s.acquire();
179		s.acquire();
180	+	s.release();
181	+	t.join();
182	+	} catch( InterruptedException e){
183	+	unexpectedException();
184	+	}
185	+	}
186	+
187	+	/**
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, false);
192	+	Thread t = new Thread(new Runnable() {
193	+	public void run() {
194	+	s.acquireUninterruptibly();
195	+	s.release();
196	+	s.release();
197	+	s.acquireUninterruptibly();
198	+	}
199	+	});
200	+	try {
201	+	t.start();
202	+	Thread.sleep(SHORT_DELAY_MS);
203	+	s.release();
204	+	s.release();
205	+	s.acquireUninterruptibly();
206	+	s.acquireUninterruptibly();
207	+	s.release();
208		t.join();
209		} catch( InterruptedException e){
210	<	fail("unexpected exception");
210	>	unexpectedException();
211		}
212		}
213
214	<	public void testTimedAcquireReleaseInSameThread(){
215	<	Semaphore s = new Semaphore(1);
214	>
215	>	/**
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, false);
220	>	Thread t = new Thread(new Runnable() {
221	>	public void run() {
222	>	try {
223	>	s.release();
224	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
225	>	s.release();
226	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
227	>
228	>	} catch(InterruptedException ie){
229	>	threadUnexpectedException();
230	>	}
231	>	}
232	>	});
233	>	try {
234	>	t.start();
235	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
236	>	s.release();
237	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
238	>	s.release();
239	>	s.release();
240	>	t.join();
241	>	} catch( InterruptedException e){
242	>	unexpectedException();
243	>	}
244	>	}
245	>
246	>	/**
247	>	* A waiting acquire blocks interruptibly
248	>	*/
249	>	public void testAcquire_InterruptedException() {
250	>	final Semaphore s = new Semaphore(0, false);
251	>	Thread t = new Thread(new Runnable() {
252	>	public void run() {
253	>	try {
254	>	s.acquire();
255	>	threadShouldThrow();
256	>	} catch(InterruptedException success){}
257	>	}
258	>	});
259	>	t.start();
260	>	try {
261	>	Thread.sleep(SHORT_DELAY_MS);
262	>	t.interrupt();
263	>	t.join();
264	>	} catch(InterruptedException e){
265	>	unexpectedException();
266	>	}
267	>	}
268	>
269	>	/**
270	>	*  A waiting timed acquire blocks interruptibly
271	>	*/
272	>	public void testTryAcquire_InterruptedException() {
273	>	final Semaphore s = new Semaphore(0, false);
274	>	Thread t = new Thread(new Runnable() {
275	>	public void run() {
276	>	try {
277	>	s.tryAcquire(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
278	>	threadShouldThrow();
279	>	} catch(InterruptedException success){
280	>	}
281	>	}
282	>	});
283	>	t.start();
284	>	try {
285	>	Thread.sleep(SHORT_DELAY_MS);
286	>	t.interrupt();
287	>	t.join();
288	>	} catch(InterruptedException e){
289	>	unexpectedException();
290	>	}
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, false);
401	>	try {
402	>	l.acquire();
403	>	l.release();
404	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
405	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
406	>	out.writeObject(l);
407	>	out.close();
408	>
409	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
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){
417	>	unexpectedException();
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 sufficent 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 sufficent 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();
#	Line 118 | Line 560 | public class SemaphoreTest extends JSR16
560		s.release();
561		assertEquals(1, s.availablePermits());
562		} catch( InterruptedException e){
563	<	fail("unexpected exception");
563	>	unexpectedException();
564		}
565		}
566
567	<	public void testTimedAcquireReleaseInDifferentThreads() {
568	<	final Semaphore s = new Semaphore(1);
569	<	Thread t = new Thread(new Runnable(){
570	<	public void run(){
571	<	try{
572	<	s.release();
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(2);
609	>	s.acquire(2);
610	>	s.release(4);
611	>	} catch(InterruptedException ie){
612	>	threadUnexpectedException();
613	>	}
614	>	}
615	>	});
616	>	try {
617	>	t.start();
618	>	Thread.sleep(SHORT_DELAY_MS);
619	>	s.release(6);
620	>	s.acquire(2);
621	>	s.acquire(2);
622	>	s.release(2);
623	>	t.join();
624	>	} catch( InterruptedException e){
625	>	unexpectedException();
626	>	}
627	>	}
628	>
629	>
630	>
631	>	/**
632	>	* release in one thread enables timed acquire in another thread
633	>	*/
634	>	public void testTimedAcquireReleaseInDifferentThreads_fair() {
635	>	final Semaphore s = new Semaphore(1, true);
636	>	Thread t = new Thread(new Runnable() {
637	>	public void run() {
638	>	try {
639	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
640	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
641	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
642		threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
132	–	s.release();
643		threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
644
645	<	}catch(InterruptedException ie){
646	<	threadFail("unexpected exception");
645	>	} catch(InterruptedException ie){
646	>	threadUnexpectedException();
647		}
648		}
649		});
650		t.start();
651		try {
142	–	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
652		s.release();
653	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
653	>	s.release();
654	>	s.release();
655	>	s.release();
656		s.release();
657		t.join();
658		} catch( InterruptedException e){
659	<	fail("unexpected exception");
659	>	unexpectedException();
660		}
661		}
662
663	<	public void testAcquire_InterruptedException(){
664	<	final Semaphore s = new Semaphore(0);
665	<	Thread t = new Thread(new Runnable(){
666	<	public void run(){
667	<	try{
663	>	/**
664	>	* release(n) in one thread enables timed acquire(n) in another thread
665	>	*/
666	>	public void testTimedAcquireReleaseNInDifferentThreads_fair() {
667	>	final Semaphore s = new Semaphore(2, true);
668	>	Thread t = new Thread(new Runnable() {
669	>	public void run() {
670	>	try {
671	>	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
672	>	s.release(2);
673	>	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
674	>	s.release(2);
675	>	} catch(InterruptedException ie){
676	>	threadUnexpectedException();
677	>	}
678	>	}
679	>	});
680	>	t.start();
681	>	try {
682	>	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
683	>	s.release(2);
684	>	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
685	>	s.release(2);
686	>	t.join();
687	>	} catch( InterruptedException e){
688	>	unexpectedException();
689	>	}
690	>	}
691	>
692	>	/**
693	>	* A waiting acquire blocks interruptibly
694	>	*/
695	>	public void testAcquire_InterruptedException_fair() {
696	>	final Semaphore s = new Semaphore(0, true);
697	>	Thread t = new Thread(new Runnable() {
698	>	public void run() {
699	>	try {
700		s.acquire();
701	<	threadFail("should throw");
702	<	}catch(InterruptedException success){}
701	>	threadShouldThrow();
702	>	} catch(InterruptedException success){}
703		}
704		});
705		t.start();
706	<	try{
706	>	try {
707		Thread.sleep(SHORT_DELAY_MS);
708		t.interrupt();
709		t.join();
710		} catch(InterruptedException e){
711	<	fail("unexpected exception");
711	>	unexpectedException();
712	>	}
713	>	}
714	>
715	>	/**
716	>	* A waiting acquire(n) blocks interruptibly
717	>	*/
718	>	public void testAcquireN_InterruptedException_fair() {
719	>	final Semaphore s = new Semaphore(2, true);
720	>	Thread t = new Thread(new Runnable() {
721	>	public void run() {
722	>	try {
723	>	s.acquire(3);
724	>	threadShouldThrow();
725	>	} catch(InterruptedException success){}
726	>	}
727	>	});
728	>	t.start();
729	>	try {
730	>	Thread.sleep(SHORT_DELAY_MS);
731	>	t.interrupt();
732	>	t.join();
733	>	} catch(InterruptedException e){
734	>	unexpectedException();
735		}
736		}
737
738	<	public void testTryAcquire_InterruptedException(){
739	<	final Semaphore s = new Semaphore(0);
740	<	Thread t = new Thread(new Runnable(){
741	<	public void run(){
742	<	try{
738	>	/**
739	>	*  A waiting tryAcquire blocks interruptibly
740	>	*/
741	>	public void testTryAcquire_InterruptedException_fair() {
742	>	final Semaphore s = new Semaphore(0, true);
743	>	Thread t = new Thread(new Runnable() {
744	>	public void run() {
745	>	try {
746		s.tryAcquire(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
747	<	threadFail("should throw");
748	<	}catch(InterruptedException success){
747	>	threadShouldThrow();
748	>	} catch(InterruptedException success){
749		}
750		}
751		});
752		t.start();
753	<	try{
753	>	try {
754		Thread.sleep(SHORT_DELAY_MS);
755		t.interrupt();
756		t.join();
757		} catch(InterruptedException e){
758	<	fail("unexpected exception");
758	>	unexpectedException();
759		}
760		}
761
762	<	public void testSerialization() {
763	<	Semaphore l = new Semaphore(3);
762	>	/**
763	>	*  A waiting tryAcquire(n) blocks interruptibly
764	>	*/
765	>	public void testTryAcquireN_InterruptedException_fair() {
766	>	final Semaphore s = new Semaphore(1, true);
767	>	Thread t = new Thread(new Runnable() {
768	>	public void run() {
769	>	try {
770	>	s.tryAcquire(4, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
771	>	threadShouldThrow();
772	>	} catch(InterruptedException success){
773	>	}
774	>	}
775	>	});
776	>	t.start();
777	>	try {
778	>	Thread.sleep(SHORT_DELAY_MS);
779	>	t.interrupt();
780	>	t.join();
781	>	} catch(InterruptedException e){
782	>	unexpectedException();
783	>	}
784	>	}
785	>
786	>	/**
787	>	* getQueueLength reports number of waiting threads
788	>	*/
789	>	public void testGetQueueLength_fair() {
790	>	final Semaphore lock = new Semaphore(1, true);
791	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
792	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
793	>	try {
794	>	assertEquals(0, lock.getQueueLength());
795	>	lock.acquireUninterruptibly();
796	>	t1.start();
797	>	Thread.sleep(SHORT_DELAY_MS);
798	>	assertEquals(1, lock.getQueueLength());
799	>	t2.start();
800	>	Thread.sleep(SHORT_DELAY_MS);
801	>	assertEquals(2, lock.getQueueLength());
802	>	t1.interrupt();
803	>	Thread.sleep(SHORT_DELAY_MS);
804	>	assertEquals(1, lock.getQueueLength());
805	>	lock.release();
806	>	Thread.sleep(SHORT_DELAY_MS);
807	>	assertEquals(0, lock.getQueueLength());
808	>	t1.join();
809	>	t2.join();
810	>	} catch(Exception e){
811	>	unexpectedException();
812	>	}
813	>	}
814	>
815	>
816	>	/**
817	>	* a deserialized serialized semaphore has same number of permits
818	>	*/
819	>	public void testSerialization_fair() {
820	>	Semaphore l = new Semaphore(3, true);
821	>
822		try {
823		l.acquire();
824		l.release();
#	Line 204 | Line 831 | public class SemaphoreTest extends JSR16
831		ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
832		Semaphore r = (Semaphore) in.readObject();
833		assertEquals(3, r.availablePermits());
834	+	assertTrue(r.isFair());
835		r.acquire();
836		r.release();
837		} catch(Exception e){
838	<	e.printStackTrace();
211	<	fail("unexpected exception");
838	>	unexpectedException();
839		}
840		}
841
842	+
843		}

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