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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 1.18 by jsr166, Mon Nov 16 05:58:01 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 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());
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	>	/**
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 s = new Semaphore(-1);
84	<	assertEquals(-1, s.availablePermits());
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 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 39 | Line 103 | public class SemaphoreTest extends JSR16
103		assertFalse(s.tryAcquire());
104		}
105
106	<	public void testAcquireReleaseInSameThread(){
107	<	Semaphore s = new Semaphore(1);
106	>	/**
107	>	* Acquire and release of semaphore succeed if initially available
108	>	*/
109	>	public void testAcquireReleaseInSameThread() {
110	>	Semaphore s = new Semaphore(1, false);
111		try {
112		s.acquire();
113		s.release();
#	Line 53 | Line 120 | public class SemaphoreTest extends JSR16
120		s.acquire();
121		s.release();
122		assertEquals(1, s.availablePermits());
123	<	} catch( InterruptedException e){
124	<	fail("unexpected exception");
123	>	} catch (InterruptedException e) {
124	>	unexpectedException();
125		}
126		}
127
128	<	public void testAcquireUninterruptiblyReleaseInSameThread(){
129	<	Semaphore s = new Semaphore(1);
128	>	/**
129	>	* Uninterruptible acquire and release of semaphore succeed if
130	>	* initially available
131	>	*/
132	>	public void testAcquireUninterruptiblyReleaseInSameThread() {
133	>	Semaphore s = new Semaphore(1, false);
134		try {
135		s.acquireUninterruptibly();
136		s.release();
#	Line 76 | Line 147 | public class SemaphoreTest extends JSR16
147		}
148		}
149
150	+	/**
151	+	* Timed Acquire and release of semaphore succeed if
152	+	* initially available
153	+	*/
154	+	public void testTimedAcquireReleaseInSameThread() {
155	+	Semaphore s = new Semaphore(1, false);
156	+	try {
157	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
158	+	s.release();
159	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
160	+	s.release();
161	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
162	+	s.release();
163	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
164	+	s.release();
165	+	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
166	+	s.release();
167	+	assertEquals(1, s.availablePermits());
168	+	} catch (InterruptedException e) {
169	+	unexpectedException();
170	+	}
171	+	}
172
173	+	/**
174	+	* A release in one thread enables an acquire in another thread
175	+	*/
176		public void testAcquireReleaseInDifferentThreads() {
177	<	final Semaphore s = new Semaphore(1);
178	<	Thread t = new Thread(new Runnable(){
179	<	public void run(){
180	<	try{
177	>	final Semaphore s = new Semaphore(0, false);
178	>	Thread t = new Thread(new Runnable() {
179	>	public void run() {
180	>	try {
181		s.acquire();
182		s.release();
183		s.release();
184		s.acquire();
185	<	}catch(InterruptedException ie){
186	<	threadFail("unexpected exception");
185	>	} catch (InterruptedException ie) {
186	>	threadUnexpectedException();
187		}
188		}
189		});
94	–	t.start();
190		try {
191	+	t.start();
192	+	Thread.sleep(SHORT_DELAY_MS);
193		s.release();
194		s.release();
195		s.acquire();
196		s.acquire();
197	+	s.release();
198	+	t.join();
199	+	} catch (InterruptedException e) {
200	+	unexpectedException();
201	+	}
202	+	}
203	+
204	+	/**
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, false);
209	+	Thread t = new Thread(new Runnable() {
210	+	public void run() {
211	+	s.acquireUninterruptibly();
212	+	s.release();
213	+	s.release();
214	+	s.acquireUninterruptibly();
215	+	}
216	+	});
217	+	try {
218	+	t.start();
219	+	Thread.sleep(SHORT_DELAY_MS);
220	+	s.release();
221	+	s.release();
222	+	s.acquireUninterruptibly();
223	+	s.acquireUninterruptibly();
224	+	s.release();
225		t.join();
226	<	} catch( InterruptedException e){
227	<	fail("unexpected exception");
226	>	} catch (InterruptedException e) {
227	>	unexpectedException();
228		}
229		}
230
231	<	public void testTimedAcquireReleaseInSameThread(){
232	<	Semaphore s = new Semaphore(1);
231	>
232	>	/**
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, false);
237	>	Thread t = new Thread(new Runnable() {
238	>	public void run() {
239	>	try {
240	>	s.release();
241	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
242	>	s.release();
243	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
244	>
245	>	} catch (InterruptedException ie) {
246	>	threadUnexpectedException();
247	>	}
248	>	}
249	>	});
250	>	try {
251	>	t.start();
252	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
253	>	s.release();
254	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
255	>	s.release();
256	>	s.release();
257	>	t.join();
258	>	} catch (InterruptedException e) {
259	>	unexpectedException();
260	>	}
261	>	}
262	>
263	>	/**
264	>	* A waiting acquire blocks interruptibly
265	>	*/
266	>	public void testAcquire_InterruptedException() {
267	>	final Semaphore s = new Semaphore(0, false);
268	>	Thread t = new Thread(new Runnable() {
269	>	public void run() {
270	>	try {
271	>	s.acquire();
272	>	threadShouldThrow();
273	>	} catch (InterruptedException success) {}
274	>	}
275	>	});
276	>	t.start();
277	>	try {
278	>	Thread.sleep(SHORT_DELAY_MS);
279	>	t.interrupt();
280	>	t.join();
281	>	} catch (InterruptedException e) {
282	>	unexpectedException();
283	>	}
284	>	}
285	>
286	>	/**
287	>	*  A waiting timed acquire blocks interruptibly
288	>	*/
289	>	public void testTryAcquire_InterruptedException() {
290	>	final Semaphore s = new Semaphore(0, false);
291	>	Thread t = new Thread(new Runnable() {
292	>	public void run() {
293	>	try {
294	>	s.tryAcquire(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
295	>	threadShouldThrow();
296	>	} catch (InterruptedException success) {
297	>	}
298	>	}
299	>	});
300	>	t.start();
301	>	try {
302	>	Thread.sleep(SHORT_DELAY_MS);
303	>	t.interrupt();
304	>	t.join();
305	>	} catch (InterruptedException e) {
306	>	unexpectedException();
307	>	}
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, false);
431	>	try {
432	>	l.acquire();
433	>	l.release();
434	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
435	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
436	>	out.writeObject(l);
437	>	out.close();
438	>
439	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
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) {
447	>	unexpectedException();
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();
#	Line 117 | Line 589 | public class SemaphoreTest extends JSR16
589		assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
590		s.release();
591		assertEquals(1, s.availablePermits());
592	<	} catch( InterruptedException e){
593	<	fail("unexpected exception");
592	>	} catch (InterruptedException e) {
593	>	unexpectedException();
594		}
595		}
596
597	<	public void testTimedAcquireReleaseInDifferentThreads() {
598	<	final Semaphore s = new Semaphore(1);
599	<	Thread t = new Thread(new Runnable(){
600	<	public void run(){
601	<	try{
602	<	s.release();
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));
132	–	s.release();
703		threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
704
705	<	}catch(InterruptedException ie){
706	<	threadFail("unexpected exception");
705	>	} catch (InterruptedException ie) {
706	>	threadUnexpectedException();
707		}
708		}
709		});
710		t.start();
711		try {
142	–	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
712		s.release();
713	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
713	>	s.release();
714	>	s.release();
715	>	s.release();
716		s.release();
717		t.join();
718	<	} catch( InterruptedException e){
719	<	fail("unexpected exception");
718	>	} catch (InterruptedException e) {
719	>	unexpectedException();
720		}
721		}
722
723	<	public void testAcquire_InterruptedException(){
724	<	final Semaphore s = new Semaphore(0);
725	<	Thread t = new Thread(new Runnable(){
726	<	public void run(){
727	<	try{
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	<	threadFail("should throw");
762	<	}catch(InterruptedException success){}
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{
789	>	try {
790		Thread.sleep(SHORT_DELAY_MS);
791		t.interrupt();
792		t.join();
793	<	} catch(InterruptedException e){
794	<	fail("unexpected exception");
793	>	} catch (InterruptedException e) {
794	>	unexpectedException();
795		}
796		}
797	<
798	<	public void testTryAcquire_InterruptedException(){
799	<	final Semaphore s = new Semaphore(0);
800	<	Thread t = new Thread(new Runnable(){
801	<	public void run(){
802	<	try{
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	<	threadFail("should throw");
808	<	}catch(InterruptedException success){
807	>	threadShouldThrow();
808	>	} catch (InterruptedException success) {
809		}
810		}
811		});
812		t.start();
813	<	try{
813	>	try {
814		Thread.sleep(SHORT_DELAY_MS);
815		t.interrupt();
816		t.join();
817	<	} catch(InterruptedException e){
818	<	fail("unexpected exception");
817	>	} catch (InterruptedException e) {
818	>	unexpectedException();
819		}
820		}
821
822	<	public void testSerialization() {
823	<	Semaphore l = new Semaphore(3);
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();
#	Line 204 | Line 891 | public class SemaphoreTest extends JSR16
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	<	e.printStackTrace();
211	<	fail("unexpected exception");
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		}

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