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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 1.12 by dl, Sun Jan 4 22:58:03 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.*;
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 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 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	<	fail("unexpected exception");
183	>	unexpectedException();
184		}
185		}
186
187	<	public void testTimedAcquireReleaseInSameThread(){
188	<	Semaphore s = new Semaphore(1);
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	>	* hasQueuedThreads reports whether there are waiting threads
295	>	*/
296	>	public void testHasQueuedThreads() {
297	>	final Semaphore lock = new Semaphore(1, false);
298	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
299	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
300	>	try {
301	>	assertFalse(lock.hasQueuedThreads());
302	>	lock.acquireUninterruptibly();
303	>	t1.start();
304	>	Thread.sleep(SHORT_DELAY_MS);
305	>	assertTrue(lock.hasQueuedThreads());
306	>	t2.start();
307	>	Thread.sleep(SHORT_DELAY_MS);
308	>	assertTrue(lock.hasQueuedThreads());
309	>	t1.interrupt();
310	>	Thread.sleep(SHORT_DELAY_MS);
311	>	assertTrue(lock.hasQueuedThreads());
312	>	lock.release();
313	>	Thread.sleep(SHORT_DELAY_MS);
314	>	assertFalse(lock.hasQueuedThreads());
315	>	t1.join();
316	>	t2.join();
317	>	} catch(Exception e){
318	>	unexpectedException();
319	>	}
320	>	}
321	>
322	>	/**
323	>	* getQueueLength reports number of waiting threads
324	>	*/
325	>	public void testGetQueueLength() {
326	>	final Semaphore lock = new Semaphore(1, false);
327	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
328	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
329	>	try {
330	>	assertEquals(0, lock.getQueueLength());
331	>	lock.acquireUninterruptibly();
332	>	t1.start();
333	>	Thread.sleep(SHORT_DELAY_MS);
334	>	assertEquals(1, lock.getQueueLength());
335	>	t2.start();
336	>	Thread.sleep(SHORT_DELAY_MS);
337	>	assertEquals(2, lock.getQueueLength());
338	>	t1.interrupt();
339	>	Thread.sleep(SHORT_DELAY_MS);
340	>	assertEquals(1, lock.getQueueLength());
341	>	lock.release();
342	>	Thread.sleep(SHORT_DELAY_MS);
343	>	assertEquals(0, lock.getQueueLength());
344	>	t1.join();
345	>	t2.join();
346	>	} catch(Exception e){
347	>	unexpectedException();
348	>	}
349	>	}
350	>
351	>	/**
352	>	* getQueuedThreads includes waiting threads
353	>	*/
354	>	public void testGetQueuedThreads() {
355	>	final PublicSemaphore lock = new PublicSemaphore(1, false);
356	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
357	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
358	>	try {
359	>	assertTrue(lock.getQueuedThreads().isEmpty());
360	>	lock.acquireUninterruptibly();
361	>	assertTrue(lock.getQueuedThreads().isEmpty());
362	>	t1.start();
363	>	Thread.sleep(SHORT_DELAY_MS);
364	>	assertTrue(lock.getQueuedThreads().contains(t1));
365	>	t2.start();
366	>	Thread.sleep(SHORT_DELAY_MS);
367	>	assertTrue(lock.getQueuedThreads().contains(t1));
368	>	assertTrue(lock.getQueuedThreads().contains(t2));
369	>	t1.interrupt();
370	>	Thread.sleep(SHORT_DELAY_MS);
371	>	assertFalse(lock.getQueuedThreads().contains(t1));
372	>	assertTrue(lock.getQueuedThreads().contains(t2));
373	>	lock.release();
374	>	Thread.sleep(SHORT_DELAY_MS);
375	>	assertTrue(lock.getQueuedThreads().isEmpty());
376	>	t1.join();
377	>	t2.join();
378	>	} catch(Exception e){
379	>	unexpectedException();
380	>	}
381	>	}
382	>
383	>	/**
384	>	* drainPermits reports and removes given number of permits
385	>	*/
386	>	public void testDrainPermits() {
387	>	Semaphore s = new Semaphore(0, false);
388	>	assertEquals(0, s.availablePermits());
389	>	assertEquals(0, s.drainPermits());
390	>	s.release(10);
391	>	assertEquals(10, s.availablePermits());
392	>	assertEquals(10, s.drainPermits());
393	>	assertEquals(0, s.availablePermits());
394	>	assertEquals(0, s.drainPermits());
395	>	}
396	>
397	>	/**
398	>	* reducePermits reduces number of permits
399	>	*/
400	>	public void testReducePermits() {
401	>	PublicSemaphore s = new PublicSemaphore(10, false);
402	>	assertEquals(10, s.availablePermits());
403	>	s.reducePermits(1);
404	>	assertEquals(9, s.availablePermits());
405	>	s.reducePermits(10);
406	>	assertEquals(-1, s.availablePermits());
407	>	}
408	>
409	>	/**
410	>	* a deserialized serialized semaphore has same number of permits
411	>	*/
412	>	public void testSerialization() {
413	>	Semaphore l = new Semaphore(3, false);
414	>	try {
415	>	l.acquire();
416	>	l.release();
417	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
418	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
419	>	out.writeObject(l);
420	>	out.close();
421	>
422	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
423	>	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
424	>	Semaphore r = (Semaphore) in.readObject();
425	>	assertEquals(3, r.availablePermits());
426	>	assertFalse(r.isFair());
427	>	r.acquire();
428	>	r.release();
429	>	} catch(Exception e){
430	>	unexpectedException();
431	>	}
432	>	}
433	>
434	>
435	>	/**
436	>	* Zero, negative, and positive initial values are allowed in constructor
437	>	*/
438	>	public void testConstructor_fair() {
439	>	Semaphore s0 = new Semaphore(0, true);
440	>	assertEquals(0, s0.availablePermits());
441	>	assertTrue(s0.isFair());
442	>	Semaphore s1 = new Semaphore(-1, true);
443	>	assertEquals(-1, s1.availablePermits());
444	>	Semaphore s2 = new Semaphore(-1, true);
445	>	assertEquals(-1, s2.availablePermits());
446	>	}
447	>
448	>	/**
449	>	* tryAcquire succeeds when sufficient permits, else fails
450	>	*/
451	>	public void testTryAcquireInSameThread_fair() {
452	>	Semaphore s = new Semaphore(2, true);
453	>	assertEquals(2, s.availablePermits());
454	>	assertTrue(s.tryAcquire());
455	>	assertTrue(s.tryAcquire());
456	>	assertEquals(0, s.availablePermits());
457	>	assertFalse(s.tryAcquire());
458	>	}
459	>
460	>	/**
461	>	* tryAcquire(n) succeeds when sufficient permits, else fails
462	>	*/
463	>	public void testTryAcquireNInSameThread_fair() {
464	>	Semaphore s = new Semaphore(2, true);
465	>	assertEquals(2, s.availablePermits());
466	>	assertTrue(s.tryAcquire(2));
467	>	assertEquals(0, s.availablePermits());
468	>	assertFalse(s.tryAcquire());
469	>	}
470	>
471	>	/**
472	>	* Acquire and release of semaphore succeed if initially available
473	>	*/
474	>	public void testAcquireReleaseInSameThread_fair() {
475	>	Semaphore s = new Semaphore(1, true);
476	>	try {
477	>	s.acquire();
478	>	s.release();
479	>	s.acquire();
480	>	s.release();
481	>	s.acquire();
482	>	s.release();
483	>	s.acquire();
484	>	s.release();
485	>	s.acquire();
486	>	s.release();
487	>	assertEquals(1, s.availablePermits());
488	>	} catch( InterruptedException e){
489	>	unexpectedException();
490	>	}
491	>	}
492	>
493	>	/**
494	>	* Acquire(n) and release(n) of semaphore succeed if initially available
495	>	*/
496	>	public void testAcquireReleaseNInSameThread_fair() {
497	>	Semaphore s = new Semaphore(1, true);
498	>	try {
499	>	s.release(1);
500	>	s.acquire(1);
501	>	s.release(2);
502	>	s.acquire(2);
503	>	s.release(3);
504	>	s.acquire(3);
505	>	s.release(4);
506	>	s.acquire(4);
507	>	s.release(5);
508	>	s.acquire(5);
509	>	assertEquals(1, s.availablePermits());
510	>	} catch( InterruptedException e){
511	>	unexpectedException();
512	>	}
513	>	}
514	>
515	>	/**
516	>	* Acquire(n) and release(n) of semaphore succeed if initially available
517	>	*/
518	>	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
519	>	Semaphore s = new Semaphore(1, true);
520	>	try {
521	>	s.release(1);
522	>	s.acquireUninterruptibly(1);
523	>	s.release(2);
524	>	s.acquireUninterruptibly(2);
525	>	s.release(3);
526	>	s.acquireUninterruptibly(3);
527	>	s.release(4);
528	>	s.acquireUninterruptibly(4);
529	>	s.release(5);
530	>	s.acquireUninterruptibly(5);
531	>	assertEquals(1, s.availablePermits());
532	>	} finally {
533	>	}
534	>	}
535	>
536	>	/**
537	>	* release(n) in one thread enables timed acquire(n) in another thread
538	>	*/
539	>	public void testTimedAcquireReleaseNInSameThread_fair() {
540	>	Semaphore s = new Semaphore(1, true);
541	>	try {
542	>	s.release(1);
543	>	assertTrue(s.tryAcquire(1, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
544	>	s.release(2);
545	>	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
546	>	s.release(3);
547	>	assertTrue(s.tryAcquire(3, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
548	>	s.release(4);
549	>	assertTrue(s.tryAcquire(4, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
550	>	s.release(5);
551	>	assertTrue(s.tryAcquire(5, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
552	>	assertEquals(1, s.availablePermits());
553	>	} catch( InterruptedException e){
554	>	unexpectedException();
555	>	}
556	>	}
557	>
558	>	/**
559	>	* release in one thread enables timed acquire in another thread
560	>	*/
561	>	public void testTimedAcquireReleaseInSameThread_fair() {
562	>	Semaphore s = new Semaphore(1, true);
563		try {
564		assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
565		s.release();
#	Line 122 | Line 573 | public class SemaphoreTest extends TestC
573		s.release();
574		assertEquals(1, s.availablePermits());
575		} catch( InterruptedException e){
576	<	fail("unexpected exception");
576	>	unexpectedException();
577		}
578		}
579
580	<	public void testTimedAcquireReleaseInDifferentThreads() {
581	<	final Semaphore s = new Semaphore(1);
582	<	Thread t = new Thread(new Runnable(){
583	<	public void run(){
584	<	try{
585	<	s.release();
586	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
587	<	s.release();
588	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
580	>	/**
581	>	* A release in one thread enables an acquire in another thread
582	>	*/
583	>	public void testAcquireReleaseInDifferentThreads_fair() {
584	>	final Semaphore s = new Semaphore(0, true);
585	>	Thread t = new Thread(new Runnable() {
586	>	public void run() {
587	>	try {
588	>	s.acquire();
589	>	s.acquire();
590	>	s.acquire();
591	>	s.acquire();
592	>	} catch(InterruptedException ie){
593	>	threadUnexpectedException();
594	>	}
595	>	}
596	>	});
597	>	try {
598	>	t.start();
599	>	Thread.sleep(SHORT_DELAY_MS);
600	>	s.release();
601	>	s.release();
602	>	s.release();
603	>	s.release();
604	>	s.release();
605	>	s.release();
606	>	t.join();
607	>	assertEquals(2, s.availablePermits());
608	>	} catch( InterruptedException e){
609	>	unexpectedException();
610	>	}
611	>	}
612
613	<	}catch(InterruptedException ie){
614	<	fail("unexpected exception");
613	>	/**
614	>	* release(n) in one thread enables acquire(n) in another thread
615	>	*/
616	>	public void testAcquireReleaseNInDifferentThreads_fair() {
617	>	final Semaphore s = new Semaphore(0, true);
618	>	Thread t = new Thread(new Runnable() {
619	>	public void run() {
620	>	try {
621	>	s.acquire();
622	>	s.release(2);
623	>	s.acquire();
624	>	} catch(InterruptedException ie){
625	>	threadUnexpectedException();
626	>	}
627	>	}
628	>	});
629	>	try {
630	>	t.start();
631	>	Thread.sleep(SHORT_DELAY_MS);
632	>	s.release(2);
633	>	s.acquire(2);
634	>	s.release(1);
635	>	t.join();
636	>	} catch( InterruptedException e){
637	>	unexpectedException();
638	>	}
639	>	}
640	>
641	>	/**
642	>	* release(n) in one thread enables acquire(n) in another thread
643	>	*/
644	>	public void testAcquireReleaseNInDifferentThreads_fair2() {
645	>	final Semaphore s = new Semaphore(0, true);
646	>	Thread t = new Thread(new Runnable() {
647	>	public void run() {
648	>	try {
649	>	s.acquire(2);
650	>	s.acquire(2);
651	>	s.release(4);
652	>	} catch(InterruptedException ie){
653	>	threadUnexpectedException();
654	>	}
655	>	}
656	>	});
657	>	try {
658	>	t.start();
659	>	Thread.sleep(SHORT_DELAY_MS);
660	>	s.release(6);
661	>	s.acquire(2);
662	>	s.acquire(2);
663	>	s.release(2);
664	>	t.join();
665	>	} catch( InterruptedException e){
666	>	unexpectedException();
667	>	}
668	>	}
669	>
670	>
671	>
672	>
673	>
674	>	/**
675	>	* release in one thread enables timed acquire in another thread
676	>	*/
677	>	public void testTimedAcquireReleaseInDifferentThreads_fair() {
678	>	final Semaphore s = new Semaphore(1, true);
679	>	Thread t = new Thread(new Runnable() {
680	>	public void run() {
681	>	try {
682	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
683	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
684	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
685	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
686	>	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
687	>
688	>	} catch(InterruptedException ie){
689	>	threadUnexpectedException();
690		}
691		}
692		});
693		t.start();
694		try {
146	–	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
695		s.release();
696	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
696	>	s.release();
697	>	s.release();
698	>	s.release();
699		s.release();
700		t.join();
701		} catch( InterruptedException e){
702	<	fail("unexpected exception");
702	>	unexpectedException();
703		}
704		}
705
706	<	public void testAcquire_InterruptedException(){
707	<	final Semaphore s = new Semaphore(0);
708	<	Thread t = new Thread(new Runnable(){
709	<	public void run(){
710	<	try{
706	>	/**
707	>	* release(n) in one thread enables timed acquire(n) in another thread
708	>	*/
709	>	public void testTimedAcquireReleaseNInDifferentThreads_fair() {
710	>	final Semaphore s = new Semaphore(2, true);
711	>	Thread t = new Thread(new Runnable() {
712	>	public void run() {
713	>	try {
714	>	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
715	>	s.release(2);
716	>	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
717	>	s.release(2);
718	>	} catch(InterruptedException ie){
719	>	threadUnexpectedException();
720	>	}
721	>	}
722	>	});
723	>	t.start();
724	>	try {
725	>	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
726	>	s.release(2);
727	>	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
728	>	s.release(2);
729	>	t.join();
730	>	} catch( InterruptedException e){
731	>	unexpectedException();
732	>	}
733	>	}
734	>
735	>	/**
736	>	* A waiting acquire blocks interruptibly
737	>	*/
738	>	public void testAcquire_InterruptedException_fair() {
739	>	final Semaphore s = new Semaphore(0, true);
740	>	Thread t = new Thread(new Runnable() {
741	>	public void run() {
742	>	try {
743		s.acquire();
744	<	fail("should throw");
745	<	}catch(InterruptedException success){}
744	>	threadShouldThrow();
745	>	} catch(InterruptedException success){}
746	>	}
747	>	});
748	>	t.start();
749	>	try {
750	>	Thread.sleep(SHORT_DELAY_MS);
751	>	t.interrupt();
752	>	t.join();
753	>	} catch(InterruptedException e){
754	>	unexpectedException();
755	>	}
756	>	}
757	>
758	>	/**
759	>	* A waiting acquire(n) blocks interruptibly
760	>	*/
761	>	public void testAcquireN_InterruptedException_fair() {
762	>	final Semaphore s = new Semaphore(2, true);
763	>	Thread t = new Thread(new Runnable() {
764	>	public void run() {
765	>	try {
766	>	s.acquire(3);
767	>	threadShouldThrow();
768	>	} catch(InterruptedException success){}
769		}
770		});
771		t.start();
772	<	try{
772	>	try {
773		Thread.sleep(SHORT_DELAY_MS);
774		t.interrupt();
775		t.join();
776		} catch(InterruptedException e){
777	<	fail("unexpected exception");
777	>	unexpectedException();
778		}
779		}
780
781	<	public void testTryAcquire_InterruptedException(){
782	<	final Semaphore s = new Semaphore(0);
783	<	Thread t = new Thread(new Runnable(){
784	<	public void run(){
785	<	try{
781	>	/**
782	>	*  A waiting tryAcquire blocks interruptibly
783	>	*/
784	>	public void testTryAcquire_InterruptedException_fair() {
785	>	final Semaphore s = new Semaphore(0, true);
786	>	Thread t = new Thread(new Runnable() {
787	>	public void run() {
788	>	try {
789		s.tryAcquire(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
790	<	fail("should throw");
791	<	}catch(InterruptedException success){
790	>	threadShouldThrow();
791	>	} catch(InterruptedException success){
792	>	}
793	>	}
794	>	});
795	>	t.start();
796	>	try {
797	>	Thread.sleep(SHORT_DELAY_MS);
798	>	t.interrupt();
799	>	t.join();
800	>	} catch(InterruptedException e){
801	>	unexpectedException();
802	>	}
803	>	}
804	>
805	>	/**
806	>	*  A waiting tryAcquire(n) blocks interruptibly
807	>	*/
808	>	public void testTryAcquireN_InterruptedException_fair() {
809	>	final Semaphore s = new Semaphore(1, true);
810	>	Thread t = new Thread(new Runnable() {
811	>	public void run() {
812	>	try {
813	>	s.tryAcquire(4, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
814	>	threadShouldThrow();
815	>	} catch(InterruptedException success){
816		}
817		}
818		});
819		t.start();
820	<	try{
820	>	try {
821		Thread.sleep(SHORT_DELAY_MS);
822		t.interrupt();
823		t.join();
824		} catch(InterruptedException e){
825	<	fail("unexpected exception");
825	>	unexpectedException();
826		}
827		}
828	+
829	+	/**
830	+	* getQueueLength reports number of waiting threads
831	+	*/
832	+	public void testGetQueueLength_fair() {
833	+	final Semaphore lock = new Semaphore(1, true);
834	+	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
835	+	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
836	+	try {
837	+	assertEquals(0, lock.getQueueLength());
838	+	lock.acquireUninterruptibly();
839	+	t1.start();
840	+	Thread.sleep(SHORT_DELAY_MS);
841	+	assertEquals(1, lock.getQueueLength());
842	+	t2.start();
843	+	Thread.sleep(SHORT_DELAY_MS);
844	+	assertEquals(2, lock.getQueueLength());
845	+	t1.interrupt();
846	+	Thread.sleep(SHORT_DELAY_MS);
847	+	assertEquals(1, lock.getQueueLength());
848	+	lock.release();
849	+	Thread.sleep(SHORT_DELAY_MS);
850	+	assertEquals(0, lock.getQueueLength());
851	+	t1.join();
852	+	t2.join();
853	+	} catch(Exception e){
854	+	unexpectedException();
855	+	}
856	+	}
857	+
858	+
859	+	/**
860	+	* a deserialized serialized semaphore has same number of permits
861	+	*/
862	+	public void testSerialization_fair() {
863	+	Semaphore l = new Semaphore(3, true);
864	+
865	+	try {
866	+	l.acquire();
867	+	l.release();
868	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
869	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
870	+	out.writeObject(l);
871	+	out.close();
872	+
873	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
874	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
875	+	Semaphore r = (Semaphore) in.readObject();
876	+	assertEquals(3, r.availablePermits());
877	+	assertTrue(r.isFair());
878	+	r.acquire();
879	+	r.release();
880	+	} catch(Exception e){
881	+	unexpectedException();
882	+	}
883	+	}
884	+
885	+
886		}

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