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 1.1 by dl, Sun Aug 31 19:24:55 2003 UTC vs.
Revision 1.7 by dl, Sat Dec 27 19:26:43 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.*;
10		import java.util.*;
11		import java.util.concurrent.*;
12	+	import java.io.*;
13
14	<	public class SemaphoreTest extends TestCase{
13	<
14	>	public class SemaphoreTest extends JSR166TestCase {
15		public static void main(String[] args) {
16		junit.textui.TestRunner.run (suite());
17		}
17	–
18		public static Test suite() {
19		return new TestSuite(SemaphoreTest.class);
20		}
21
22	<	private static long SHORT_DELAY_MS = 100;
23	<	private static long MEDIUM_DELAY_MS = 1000;
24	<	private static long LONG_DELAY_MS = 10000;
25	<
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 testConstructor1() {
36	<	Semaphore s = new Semaphore(0);
37	<	assertEquals(0, 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	<	public void testConstructor2() {
49	<	Semaphore s = new Semaphore(-1);
50	<	assertEquals(-1, s.availablePermits());
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 43 | Line 86 | public class SemaphoreTest extends TestC
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 58 | Line 104 | public class SemaphoreTest extends TestC
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 80 | Line 130 | public class SemaphoreTest extends TestC
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	<	fail("unexpected exception");
168	>	} catch(InterruptedException ie){
169	>	threadUnexpectedException();
170		}
171		}
172		});
98	–	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	+	unexpectedException();
211	+	}
212	+	}
213	+
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	+	* getQueueLength reports number of waiting threads
295	+	*/
296	+	public void testGetQueueLength() {
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	+	assertEquals(0, lock.getQueueLength());
302	+	lock.acquireUninterruptibly();
303	+	t1.start();
304	+	Thread.sleep(SHORT_DELAY_MS);
305	+	assertEquals(1, lock.getQueueLength());
306	+	t2.start();
307	+	Thread.sleep(SHORT_DELAY_MS);
308	+	assertEquals(2, lock.getQueueLength());
309	+	t1.interrupt();
310	+	Thread.sleep(SHORT_DELAY_MS);
311	+	assertEquals(1, lock.getQueueLength());
312	+	lock.release();
313	+	Thread.sleep(SHORT_DELAY_MS);
314	+	assertEquals(0, lock.getQueueLength());
315	+	t1.join();
316	+	t2.join();
317	+	} catch(Exception e){
318	+	unexpectedException();
319	+	}
320	+	}
321	+
322	+	/**
323	+	* getQueuedThreads includes waiting threads
324	+	*/
325	+	public void testGetQueuedThreads() {
326	+	final PublicSemaphore lock = new PublicSemaphore(1, false);
327	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
328	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
329	+	try {
330	+	assertTrue(lock.getQueuedThreads().isEmpty());
331	+	lock.acquireUninterruptibly();
332	+	assertTrue(lock.getQueuedThreads().isEmpty());
333	+	t1.start();
334	+	Thread.sleep(SHORT_DELAY_MS);
335	+	assertTrue(lock.getQueuedThreads().contains(t1));
336	+	t2.start();
337	+	Thread.sleep(SHORT_DELAY_MS);
338	+	assertTrue(lock.getQueuedThreads().contains(t1));
339	+	assertTrue(lock.getQueuedThreads().contains(t2));
340	+	t1.interrupt();
341	+	Thread.sleep(SHORT_DELAY_MS);
342	+	assertFalse(lock.getQueuedThreads().contains(t1));
343	+	assertTrue(lock.getQueuedThreads().contains(t2));
344	+	lock.release();
345	+	Thread.sleep(SHORT_DELAY_MS);
346	+	assertTrue(lock.getQueuedThreads().isEmpty());
347	+	t1.join();
348	+	t2.join();
349	+	} catch(Exception e){
350	+	unexpectedException();
351	+	}
352	+	}
353	+
354	+
355	+	/**
356	+	* reducePermits reduces number of permits
357	+	*/
358	+	public void testReducePermits() {
359	+	PublicSemaphore s = new PublicSemaphore(10, false);
360	+	assertEquals(10, s.availablePermits());
361	+	s.reducePermits(1);
362	+	assertEquals(9, s.availablePermits());
363	+	s.reducePermits(10);
364	+	assertEquals(-1, s.availablePermits());
365	+	}
366	+
367	+	/**
368	+	* a deserialized serialized semaphore has same number of permits
369	+	*/
370	+	public void testSerialization() {
371	+	Semaphore l = new Semaphore(3, false);
372	+	try {
373	+	l.acquire();
374	+	l.release();
375	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
376	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
377	+	out.writeObject(l);
378	+	out.close();
379	+
380	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
381	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
382	+	Semaphore r = (Semaphore) in.readObject();
383	+	assertEquals(3, r.availablePermits());
384	+	assertFalse(r.isFair());
385	+	r.acquire();
386	+	r.release();
387	+	} catch(Exception e){
388	+	unexpectedException();
389	+	}
390	+	}
391	+
392	+
393	+	/**
394	+	* Zero, negative, and positive initial values are allowed in constructor
395	+	*/
396	+	public void testConstructor_fair() {
397	+	Semaphore s0 = new Semaphore(0, true);
398	+	assertEquals(0, s0.availablePermits());
399	+	assertTrue(s0.isFair());
400	+	Semaphore s1 = new Semaphore(-1, true);
401	+	assertEquals(-1, s1.availablePermits());
402	+	Semaphore s2 = new Semaphore(-1, true);
403	+	assertEquals(-1, s2.availablePermits());
404	+	}
405	+
406	+	/**
407	+	* tryAcquire succeeds when sufficent permits, else fails
408	+	*/
409	+	public void testTryAcquireInSameThread_fair() {
410	+	Semaphore s = new Semaphore(2, true);
411	+	assertEquals(2, s.availablePermits());
412	+	assertTrue(s.tryAcquire());
413	+	assertTrue(s.tryAcquire());
414	+	assertEquals(0, s.availablePermits());
415	+	assertFalse(s.tryAcquire());
416	+	}
417	+
418	+	/**
419	+	* tryAcquire(n) succeeds when sufficent permits, else fails
420	+	*/
421	+	public void testTryAcquireNInSameThread_fair() {
422	+	Semaphore s = new Semaphore(2, true);
423	+	assertEquals(2, s.availablePermits());
424	+	assertTrue(s.tryAcquire(2));
425	+	assertEquals(0, s.availablePermits());
426	+	assertFalse(s.tryAcquire());
427	+	}
428	+
429	+	/**
430	+	* Acquire and release of semaphore succeed if initially available
431	+	*/
432	+	public void testAcquireReleaseInSameThread_fair() {
433	+	Semaphore s = new Semaphore(1, true);
434	+	try {
435	+	s.acquire();
436	+	s.release();
437	+	s.acquire();
438	+	s.release();
439	+	s.acquire();
440	+	s.release();
441	+	s.acquire();
442	+	s.release();
443	+	s.acquire();
444	+	s.release();
445	+	assertEquals(1, s.availablePermits());
446	+	} catch( InterruptedException e){
447	+	unexpectedException();
448	+	}
449	+	}
450	+
451	+	/**
452	+	* Acquire(n) and release(n) of semaphore succeed if initially available
453	+	*/
454	+	public void testAcquireReleaseNInSameThread_fair() {
455	+	Semaphore s = new Semaphore(1, true);
456	+	try {
457	+	s.release(1);
458	+	s.acquire(1);
459	+	s.release(2);
460	+	s.acquire(2);
461	+	s.release(3);
462	+	s.acquire(3);
463	+	s.release(4);
464	+	s.acquire(4);
465	+	s.release(5);
466	+	s.acquire(5);
467	+	assertEquals(1, s.availablePermits());
468	+	} catch( InterruptedException e){
469	+	unexpectedException();
470	+	}
471	+	}
472	+
473	+	/**
474	+	* Acquire(n) and release(n) of semaphore succeed if initially available
475	+	*/
476	+	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
477	+	Semaphore s = new Semaphore(1, true);
478	+	try {
479	+	s.release(1);
480	+	s.acquireUninterruptibly(1);
481	+	s.release(2);
482	+	s.acquireUninterruptibly(2);
483	+	s.release(3);
484	+	s.acquireUninterruptibly(3);
485	+	s.release(4);
486	+	s.acquireUninterruptibly(4);
487	+	s.release(5);
488	+	s.acquireUninterruptibly(5);
489	+	assertEquals(1, s.availablePermits());
490	+	} finally {
491	+	}
492	+	}
493	+
494	+	/**
495	+	* release(n) in one thread enables timed acquire(n) in another thread
496	+	*/
497	+	public void testTimedAcquireReleaseNInSameThread_fair() {
498	+	Semaphore s = new Semaphore(1, true);
499	+	try {
500	+	s.release(1);
501	+	assertTrue(s.tryAcquire(1, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
502	+	s.release(2);
503	+	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
504	+	s.release(3);
505	+	assertTrue(s.tryAcquire(3, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
506	+	s.release(4);
507	+	assertTrue(s.tryAcquire(4, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
508	+	s.release(5);
509	+	assertTrue(s.tryAcquire(5, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
510	+	assertEquals(1, s.availablePermits());
511		} catch( InterruptedException e){
512	<	fail("unexpected exception");
512	>	unexpectedException();
513		}
514		}
515
516	<	public void testTimedAcquireReleaseInSameThread(){
517	<	Semaphore s = new Semaphore(1);
516	>	/**
517	>	* release in one thread enables timed acquire in another thread
518	>	*/
519	>	public void testTimedAcquireReleaseInSameThread_fair() {
520	>	Semaphore s = new Semaphore(1, true);
521		try {
522		assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
523		s.release();
#	Line 122 | Line 531 | public class SemaphoreTest extends TestC
531		s.release();
532		assertEquals(1, s.availablePermits());
533		} catch( InterruptedException e){
534	<	fail("unexpected exception");
534	>	unexpectedException();
535	>	}
536	>	}
537	>
538	>	/**
539	>	* A release in one thread enables an acquire in another thread
540	>	*/
541	>	public void testAcquireReleaseInDifferentThreads_fair() {
542	>	final Semaphore s = new Semaphore(0, true);
543	>	Thread t = new Thread(new Runnable() {
544	>	public void run() {
545	>	try {
546	>	s.acquire();
547	>	s.acquire();
548	>	s.acquire();
549	>	s.acquire();
550	>	} catch(InterruptedException ie){
551	>	threadUnexpectedException();
552	>	}
553	>	}
554	>	});
555	>	try {
556	>	t.start();
557	>	Thread.sleep(SHORT_DELAY_MS);
558	>	s.release();
559	>	s.release();
560	>	s.release();
561	>	s.release();
562	>	s.release();
563	>	s.release();
564	>	t.join();
565	>	assertEquals(2, s.availablePermits());
566	>	} catch( InterruptedException e){
567	>	unexpectedException();
568	>	}
569	>	}
570	>
571	>	/**
572	>	* release(n) in one thread enables acquire(n) in another thread
573	>	*/
574	>	public void testAcquireReleaseNInDifferentThreads_fair() {
575	>	final Semaphore s = new Semaphore(0, true);
576	>	Thread t = new Thread(new Runnable() {
577	>	public void run() {
578	>	try {
579	>	s.acquire(2);
580	>	s.acquire(2);
581	>	s.release(4);
582	>	} catch(InterruptedException ie){
583	>	threadUnexpectedException();
584	>	}
585	>	}
586	>	});
587	>	try {
588	>	t.start();
589	>	Thread.sleep(SHORT_DELAY_MS);
590	>	s.release(6);
591	>	s.acquire(2);
592	>	s.acquire(2);
593	>	s.release(2);
594	>	t.join();
595	>	} catch( InterruptedException e){
596	>	unexpectedException();
597		}
598		}
599
129	–	public void testTimedAcquireReleaseInDifferentThreads() {
130	–	final Semaphore s = new Semaphore(1);
131	–	Thread t = new Thread(new Runnable(){
132	–	public void run(){
133	–	try{
134	–	s.release();
135	–	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
136	–	s.release();
137	–	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
600
601	<	}catch(InterruptedException ie){
602	<	fail("unexpected exception");
601	>
602	>	/**
603	>	* release in one thread enables timed acquire in another thread
604	>	*/
605	>	public void testTimedAcquireReleaseInDifferentThreads_fair() {
606	>	final Semaphore s = new Semaphore(1, true);
607	>	Thread t = new Thread(new Runnable() {
608	>	public void run() {
609	>	try {
610	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
611	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
612	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
613	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
614	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
615	>
616	>	} catch(InterruptedException ie){
617	>	threadUnexpectedException();
618		}
619		}
620		});
621		t.start();
622		try {
146	–	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
623		s.release();
624	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
624	>	s.release();
625	>	s.release();
626	>	s.release();
627		s.release();
628		t.join();
629		} catch( InterruptedException e){
630	<	fail("unexpected exception");
630	>	unexpectedException();
631		}
632		}
633
634	<	public void testAcquire_InterruptedException(){
635	<	final Semaphore s = new Semaphore(0);
636	<	Thread t = new Thread(new Runnable(){
637	<	public void run(){
638	<	try{
634	>	/**
635	>	* release(n) in one thread enables timed acquire(n) in another thread
636	>	*/
637	>	public void testTimedAcquireReleaseNInDifferentThreads_fair() {
638	>	final Semaphore s = new Semaphore(2, true);
639	>	Thread t = new Thread(new Runnable() {
640	>	public void run() {
641	>	try {
642	>	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
643	>	s.release(2);
644	>	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
645	>	s.release(2);
646	>	} catch(InterruptedException ie){
647	>	threadUnexpectedException();
648	>	}
649	>	}
650	>	});
651	>	t.start();
652	>	try {
653	>	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
654	>	s.release(2);
655	>	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
656	>	s.release(2);
657	>	t.join();
658	>	} catch( InterruptedException e){
659	>	unexpectedException();
660	>	}
661	>	}
662	>
663	>	/**
664	>	* A waiting acquire blocks interruptibly
665	>	*/
666	>	public void testAcquire_InterruptedException_fair() {
667	>	final Semaphore s = new Semaphore(0, true);
668	>	Thread t = new Thread(new Runnable() {
669	>	public void run() {
670	>	try {
671		s.acquire();
672	<	fail("should throw");
673	<	}catch(InterruptedException success){}
672	>	threadShouldThrow();
673	>	} catch(InterruptedException success){}
674	>	}
675	>	});
676	>	t.start();
677	>	try {
678	>	Thread.sleep(SHORT_DELAY_MS);
679	>	t.interrupt();
680	>	t.join();
681	>	} catch(InterruptedException e){
682	>	unexpectedException();
683	>	}
684	>	}
685	>
686	>	/**
687	>	* A waiting acquire(n) blocks interruptibly
688	>	*/
689	>	public void testAcquireN_InterruptedException_fair() {
690	>	final Semaphore s = new Semaphore(2, true);
691	>	Thread t = new Thread(new Runnable() {
692	>	public void run() {
693	>	try {
694	>	s.acquire(3);
695	>	threadShouldThrow();
696	>	} catch(InterruptedException success){}
697		}
698		});
699		t.start();
700	<	try{
700	>	try {
701		Thread.sleep(SHORT_DELAY_MS);
702		t.interrupt();
703		t.join();
704		} catch(InterruptedException e){
705	<	fail("unexpected exception");
705	>	unexpectedException();
706		}
707		}
708
709	<	public void testTryAcquire_InterruptedException(){
710	<	final Semaphore s = new Semaphore(0);
711	<	Thread t = new Thread(new Runnable(){
712	<	public void run(){
713	<	try{
709	>	/**
710	>	*  A waiting tryAcquire blocks interruptibly
711	>	*/
712	>	public void testTryAcquire_InterruptedException_fair() {
713	>	final Semaphore s = new Semaphore(0, true);
714	>	Thread t = new Thread(new Runnable() {
715	>	public void run() {
716	>	try {
717		s.tryAcquire(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
718	<	fail("should throw");
719	<	}catch(InterruptedException success){
718	>	threadShouldThrow();
719	>	} catch(InterruptedException success){
720	>	}
721	>	}
722	>	});
723	>	t.start();
724	>	try {
725	>	Thread.sleep(SHORT_DELAY_MS);
726	>	t.interrupt();
727	>	t.join();
728	>	} catch(InterruptedException e){
729	>	unexpectedException();
730	>	}
731	>	}
732	>
733	>	/**
734	>	*  A waiting tryAcquire(n) blocks interruptibly
735	>	*/
736	>	public void testTryAcquireN_InterruptedException_fair() {
737	>	final Semaphore s = new Semaphore(1, true);
738	>	Thread t = new Thread(new Runnable() {
739	>	public void run() {
740	>	try {
741	>	s.tryAcquire(4, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
742	>	threadShouldThrow();
743	>	} catch(InterruptedException success){
744		}
745		}
746		});
747		t.start();
748	<	try{
748	>	try {
749		Thread.sleep(SHORT_DELAY_MS);
750		t.interrupt();
751		t.join();
752		} catch(InterruptedException e){
753	<	fail("unexpected exception");
753	>	unexpectedException();
754	>	}
755	>	}
756	>
757	>	/**
758	>	* getQueueLength reports number of waiting threads
759	>	*/
760	>	public void testGetQueueLength_fair() {
761	>	final Semaphore lock = new Semaphore(1, true);
762	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
763	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
764	>	try {
765	>	assertEquals(0, lock.getQueueLength());
766	>	lock.acquireUninterruptibly();
767	>	t1.start();
768	>	Thread.sleep(SHORT_DELAY_MS);
769	>	assertEquals(1, lock.getQueueLength());
770	>	t2.start();
771	>	Thread.sleep(SHORT_DELAY_MS);
772	>	assertEquals(2, lock.getQueueLength());
773	>	t1.interrupt();
774	>	Thread.sleep(SHORT_DELAY_MS);
775	>	assertEquals(1, lock.getQueueLength());
776	>	lock.release();
777	>	Thread.sleep(SHORT_DELAY_MS);
778	>	assertEquals(0, lock.getQueueLength());
779	>	t1.join();
780	>	t2.join();
781	>	} catch(Exception e){
782	>	unexpectedException();
783	>	}
784	>	}
785	>
786	>
787	>	/**
788	>	* a deserialized serialized semaphore has same number of permits
789	>	*/
790	>	public void testSerialization_fair() {
791	>	Semaphore l = new Semaphore(3, true);
792	>
793	>	try {
794	>	l.acquire();
795	>	l.release();
796	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
797	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
798	>	out.writeObject(l);
799	>	out.close();
800	>
801	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
802	>	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
803	>	Semaphore r = (Semaphore) in.readObject();
804	>	assertEquals(3, r.availablePermits());
805	>	assertTrue(r.isFair());
806	>	r.acquire();
807	>	r.release();
808	>	} catch(Exception e){
809	>	unexpectedException();
810		}
811		}
812	+
813	+
814		}

Diff Legend

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