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

Comparing jsr166/src/test/tck/SemaphoreTest.java (file contents):
Revision 1.2 by dl, Sun Sep 7 20:39:11 2003 UTC vs.
Revision 1.25 by jsr166, Sat Oct 9 19:30:35 2010 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 static java.util.concurrent.TimeUnit.MILLISECONDS;
13		import java.io.*;
14
15	<	public class SemaphoreTest extends TestCase{
14	<
15	>	public class SemaphoreTest extends JSR166TestCase {
16		public static void main(String[] args) {
17	<	junit.textui.TestRunner.run (suite());
17	>	junit.textui.TestRunner.run(suite());
18		}
18	–
19		public static Test suite() {
20	<	return new TestSuite(SemaphoreTest.class);
20	>	return new TestSuite(SemaphoreTest.class);
21		}
22
23	<	private static long SHORT_DELAY_MS = 100;
24	<	private static long MEDIUM_DELAY_MS = 1000;
25	<	private static long LONG_DELAY_MS = 10000;
23	>	/**
24	>	* Subclass to expose protected methods
25	>	*/
26	>	static class PublicSemaphore extends Semaphore {
27	>	PublicSemaphore(int p, boolean f) { super(p, f); }
28	>	public Collection<Thread> getQueuedThreads() {
29	>	return super.getQueuedThreads();
30	>	}
31	>	public void reducePermits(int p) {
32	>	super.reducePermits(p);
33	>	}
34	>	}
35
36	+	/**
37	+	* A runnable calling acquire
38	+	*/
39	+	class InterruptibleLockRunnable extends CheckedRunnable {
40	+	final Semaphore lock;
41	+	InterruptibleLockRunnable(Semaphore l) { lock = l; }
42	+	public void realRun() {
43	+	try {
44	+	lock.acquire();
45	+	}
46	+	catch (InterruptedException ignored) {}
47	+	}
48	+	}
49
50	<	public void testConstructor1() {
51	<	Semaphore s = new Semaphore(0);
52	<	assertEquals(0, s.availablePermits());
50	>
51	>	/**
52	>	* A runnable calling acquire that expects to be interrupted
53	>	*/
54	>	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
55	>	final Semaphore lock;
56	>	InterruptedLockRunnable(Semaphore l) { lock = l; }
57	>	public void realRun() throws InterruptedException {
58	>	lock.acquire();
59	>	}
60		}
61
62	+	/**
63	+	* Zero, negative, and positive initial values are allowed in constructor
64	+	*/
65	+	public void testConstructor() {
66	+	for (int permits : new int[] { -1, 0, 1 }) {
67	+	for (boolean fair : new boolean[] { false, true }) {
68	+	Semaphore s = new Semaphore(permits, fair);
69	+	assertEquals(permits, s.availablePermits());
70	+	assertEquals(fair, s.isFair());
71	+	}
72	+	}
73	+	}
74	+
75	+	/**
76	+	* Constructor without fairness argument behaves as nonfair
77	+	*/
78		public void testConstructor2() {
79	<	Semaphore s = new Semaphore(-1);
80	<	assertEquals(-1, s.availablePermits());
79	>	for (int permits : new int[] { -1, 0, 1 }) {
80	>	Semaphore s = new Semaphore(permits);
81	>	assertEquals(permits, s.availablePermits());
82	>	assertFalse(s.isFair());
83	>	}
84		}
85
86	+	/**
87	+	* tryAcquire succeeds when sufficient permits, else fails
88	+	*/
89		public void testTryAcquireInSameThread() {
90	<	Semaphore s = new Semaphore(2);
90	>	Semaphore s = new Semaphore(2, false);
91		assertEquals(2, s.availablePermits());
92		assertTrue(s.tryAcquire());
93		assertTrue(s.tryAcquire());
#	Line 44 | Line 95 | public class SemaphoreTest extends TestC
95		assertFalse(s.tryAcquire());
96		}
97
98	<	public void testAcquireReleaseInSameThread(){
99	<	Semaphore s = new Semaphore(1);
100	<	try {
101	<	s.acquire();
102	<	s.release();
103	<	s.acquire();
104	<	s.release();
105	<	s.acquire();
106	<	s.release();
107	<	s.acquire();
108	<	s.release();
109	<	s.acquire();
110	<	s.release();
111	<	assertEquals(1, s.availablePermits());
112	<	} catch( InterruptedException e){
113	<	fail("unexpected exception");
114	<	}
115	<	}
116	<
117	<	public void testAcquireUninterruptiblyReleaseInSameThread(){
118	<	Semaphore s = new Semaphore(1);
119	<	try {
120	<	s.acquireUninterruptibly();
121	<	s.release();
122	<	s.acquireUninterruptibly();
123	<	s.release();
124	<	s.acquireUninterruptibly();
125	<	s.release();
126	<	s.acquireUninterruptibly();
127	<	s.release();
128	<	s.acquireUninterruptibly();
129	<	s.release();
130	<	assertEquals(1, s.availablePermits());
131	<	} finally {
132	<	}
133	<	}
134	<
135	<
136	<	public void testAcquireReleaseInDifferentThreads() {
137	<	final Semaphore s = new Semaphore(1);
138	<	Thread t = new Thread(new Runnable(){
139	<	public void run(){
140	<	try{
141	<	s.acquire();
142	<	s.release();
143	<	s.release();
144	<	s.acquire();
145	<	}catch(InterruptedException ie){
146	<	fail("unexpected exception");
147	<	}
148	<	}
149	<	});
150	<	t.start();
151	<	try {
152	<	s.release();
153	<	s.release();
154	<	s.acquire();
155	<	s.acquire();
156	<	t.join();
157	<	} catch( InterruptedException e){
158	<	fail("unexpected exception");
159	<	}
160	<	}
161	<
162	<	public void testTimedAcquireReleaseInSameThread(){
163	<	Semaphore s = new Semaphore(1);
164	<	try {
165	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
166	<	s.release();
167	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
168	<	s.release();
169	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
170	<	s.release();
171	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
172	<	s.release();
173	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
174	<	s.release();
175	<	assertEquals(1, s.availablePermits());
176	<	} catch( InterruptedException e){
177	<	fail("unexpected exception");
178	<	}
179	<	}
180	<
181	<	public void testTimedAcquireReleaseInDifferentThreads() {
182	<	final Semaphore s = new Semaphore(1);
183	<	Thread t = new Thread(new Runnable(){
184	<	public void run(){
185	<	try{
186	<	s.release();
187	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
188	<	s.release();
189	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
190	<
191	<	}catch(InterruptedException ie){
192	<	fail("unexpected exception");
193	<	}
194	<	}
195	<	});
196	<	t.start();
197	<	try {
198	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
199	<	s.release();
200	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
201	<	s.release();
202	<	t.join();
203	<	} catch( InterruptedException e){
204	<	fail("unexpected exception");
205	<	}
206	<	}
207	<
208	<	public void testAcquire_InterruptedException(){
209	<	final Semaphore s = new Semaphore(0);
210	<	Thread t = new Thread(new Runnable(){
211	<	public void run(){
212	<	try{
213	<	s.acquire();
214	<	fail("should throw");
215	<	}catch(InterruptedException success){}
216	<	}
217	<	});
218	<	t.start();
219	<	try{
220	<	Thread.sleep(SHORT_DELAY_MS);
221	<	t.interrupt();
222	<	t.join();
223	<	} catch(InterruptedException e){
224	<	fail("unexpected exception");
225	<	}
226	<	}
227	<
228	<	public void testTryAcquire_InterruptedException(){
229	<	final Semaphore s = new Semaphore(0);
230	<	Thread t = new Thread(new Runnable(){
231	<	public void run(){
232	<	try{
233	<	s.tryAcquire(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
234	<	fail("should throw");
235	<	}catch(InterruptedException success){
236	<	}
237	<	}
238	<	});
239	<	t.start();
240	<	try{
241	<	Thread.sleep(SHORT_DELAY_MS);
242	<	t.interrupt();
243	<	t.join();
244	<	} catch(InterruptedException e){
245	<	fail("unexpected exception");
246	<	}
247	<	}
248	<
249	<	public void testSerialization() {
250	<	Semaphore l = new Semaphore(3);
251	<
252	<	try {
253	<	l.acquire();
254	<	l.release();
255	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
256	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
257	<	out.writeObject(l);
258	<	out.close();
259	<
260	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
261	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
262	<	Semaphore r = (Semaphore) in.readObject();
263	<	assertEquals(3, r.availablePermits());
264	<	r.acquire();
265	<	r.release();
266	<	} catch(Exception e){
267	<	e.printStackTrace();
268	<	fail("unexpected exception");
269	<	}
98	>	/**
99	>	* Acquire and release of semaphore succeed if initially available
100	>	*/
101	>	public void testAcquireReleaseInSameThread()
102	>	throws InterruptedException {
103	>	Semaphore s = new Semaphore(1, false);
104	>	s.acquire();
105	>	s.release();
106	>	s.acquire();
107	>	s.release();
108	>	s.acquire();
109	>	s.release();
110	>	s.acquire();
111	>	s.release();
112	>	s.acquire();
113	>	s.release();
114	>	assertEquals(1, s.availablePermits());
115	>	}
116	>
117	>	/**
118	>	* Uninterruptible acquire and release of semaphore succeed if
119	>	* initially available
120	>	*/
121	>	public void testAcquireUninterruptiblyReleaseInSameThread()
122	>	throws InterruptedException {
123	>	Semaphore s = new Semaphore(1, false);
124	>	s.acquireUninterruptibly();
125	>	s.release();
126	>	s.acquireUninterruptibly();
127	>	s.release();
128	>	s.acquireUninterruptibly();
129	>	s.release();
130	>	s.acquireUninterruptibly();
131	>	s.release();
132	>	s.acquireUninterruptibly();
133	>	s.release();
134	>	assertEquals(1, s.availablePermits());
135	>	}
136	>
137	>	/**
138	>	* Timed Acquire and release of semaphore succeed if
139	>	* initially available
140	>	*/
141	>	public void testTimedAcquireReleaseInSameThread()
142	>	throws InterruptedException {
143	>	Semaphore s = new Semaphore(1, false);
144	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
145	>	s.release();
146	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
147	>	s.release();
148	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
149	>	s.release();
150	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
151	>	s.release();
152	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
153	>	s.release();
154	>	assertEquals(1, s.availablePermits());
155	>	}
156	>
157	>	/**
158	>	* A release in one thread enables an acquire in another thread
159	>	*/
160	>	public void testAcquireReleaseInDifferentThreads()
161	>	throws InterruptedException {
162	>	final Semaphore s = new Semaphore(0, false);
163	>	Thread t = new Thread(new CheckedRunnable() {
164	>	public void realRun() throws InterruptedException {
165	>	s.acquire();
166	>	s.release();
167	>	s.release();
168	>	s.acquire();
169	>	}});
170	>
171	>	t.start();
172	>	Thread.sleep(SHORT_DELAY_MS);
173	>	s.release();
174	>	s.release();
175	>	s.acquire();
176	>	s.acquire();
177	>	s.release();
178	>	t.join();
179	>	}
180	>
181	>	/**
182	>	* A release in one thread enables an uninterruptible acquire in another thread
183	>	*/
184	>	public void testUninterruptibleAcquireReleaseInDifferentThreads()
185	>	throws InterruptedException {
186	>	final Semaphore s = new Semaphore(0, false);
187	>	Thread t = new Thread(new CheckedRunnable() {
188	>	public void realRun() throws InterruptedException {
189	>	s.acquireUninterruptibly();
190	>	s.release();
191	>	s.release();
192	>	s.acquireUninterruptibly();
193	>	}});
194	>
195	>	t.start();
196	>	Thread.sleep(SHORT_DELAY_MS);
197	>	s.release();
198	>	s.release();
199	>	s.acquireUninterruptibly();
200	>	s.acquireUninterruptibly();
201	>	s.release();
202	>	t.join();
203	>	}
204	>
205	>
206	>	/**
207	>	* A release in one thread enables a timed acquire in another thread
208	>	*/
209	>	public void testTimedAcquireReleaseInDifferentThreads()
210	>	throws InterruptedException {
211	>	final Semaphore s = new Semaphore(1, false);
212	>	Thread t = new Thread(new CheckedRunnable() {
213	>	public void realRun() throws InterruptedException {
214	>	s.release();
215	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
216	>	s.release();
217	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
218	>	}});
219	>
220	>	t.start();
221	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
222	>	s.release();
223	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
224	>	s.release();
225	>	s.release();
226	>	t.join();
227	>	}
228	>
229	>	/**
230	>	* A waiting acquire blocks interruptibly
231	>	*/
232	>	public void testAcquire_InterruptedException()
233	>	throws InterruptedException {
234	>	final Semaphore s = new Semaphore(0, false);
235	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
236	>	public void realRun() throws InterruptedException {
237	>	s.acquire();
238	>	}});
239	>
240	>	t.start();
241	>	Thread.sleep(SHORT_DELAY_MS);
242	>	t.interrupt();
243	>	t.join();
244	>	}
245	>
246	>	/**
247	>	* A waiting timed acquire blocks interruptibly
248	>	*/
249	>	public void testTryAcquire_InterruptedException()
250	>	throws InterruptedException {
251	>	final Semaphore s = new Semaphore(0, false);
252	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
253	>	public void realRun() throws InterruptedException {
254	>	s.tryAcquire(MEDIUM_DELAY_MS, MILLISECONDS);
255	>	}});
256	>
257	>	t.start();
258	>	Thread.sleep(SHORT_DELAY_MS);
259	>	t.interrupt();
260	>	t.join();
261	>	}
262	>
263	>	/**
264	>	* hasQueuedThreads reports whether there are waiting threads
265	>	*/
266	>	public void testHasQueuedThreads() throws InterruptedException {
267	>	final Semaphore lock = new Semaphore(1, false);
268	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
269	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
270	>	assertFalse(lock.hasQueuedThreads());
271	>	lock.acquireUninterruptibly();
272	>	t1.start();
273	>	Thread.sleep(SHORT_DELAY_MS);
274	>	assertTrue(lock.hasQueuedThreads());
275	>	t2.start();
276	>	Thread.sleep(SHORT_DELAY_MS);
277	>	assertTrue(lock.hasQueuedThreads());
278	>	t1.interrupt();
279	>	Thread.sleep(SHORT_DELAY_MS);
280	>	assertTrue(lock.hasQueuedThreads());
281	>	lock.release();
282	>	Thread.sleep(SHORT_DELAY_MS);
283	>	assertFalse(lock.hasQueuedThreads());
284	>	t1.join();
285	>	t2.join();
286	>	}
287	>
288	>	/**
289	>	* getQueueLength reports number of waiting threads
290	>	*/
291	>	public void testGetQueueLength() throws InterruptedException {
292	>	final Semaphore lock = new Semaphore(1, false);
293	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
294	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
295	>	assertEquals(0, lock.getQueueLength());
296	>	lock.acquireUninterruptibly();
297	>	t1.start();
298	>	Thread.sleep(SHORT_DELAY_MS);
299	>	assertEquals(1, lock.getQueueLength());
300	>	t2.start();
301	>	Thread.sleep(SHORT_DELAY_MS);
302	>	assertEquals(2, lock.getQueueLength());
303	>	t1.interrupt();
304	>	Thread.sleep(SHORT_DELAY_MS);
305	>	assertEquals(1, lock.getQueueLength());
306	>	lock.release();
307	>	Thread.sleep(SHORT_DELAY_MS);
308	>	assertEquals(0, lock.getQueueLength());
309	>	t1.join();
310	>	t2.join();
311	>	}
312	>
313	>	/**
314	>	* getQueuedThreads includes waiting threads
315	>	*/
316	>	public void testGetQueuedThreads() throws InterruptedException {
317	>	final PublicSemaphore lock = new PublicSemaphore(1, false);
318	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
319	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
320	>	assertTrue(lock.getQueuedThreads().isEmpty());
321	>	lock.acquireUninterruptibly();
322	>	assertTrue(lock.getQueuedThreads().isEmpty());
323	>	t1.start();
324	>	Thread.sleep(SHORT_DELAY_MS);
325	>	assertTrue(lock.getQueuedThreads().contains(t1));
326	>	t2.start();
327	>	Thread.sleep(SHORT_DELAY_MS);
328	>	assertTrue(lock.getQueuedThreads().contains(t1));
329	>	assertTrue(lock.getQueuedThreads().contains(t2));
330	>	t1.interrupt();
331	>	Thread.sleep(SHORT_DELAY_MS);
332	>	assertFalse(lock.getQueuedThreads().contains(t1));
333	>	assertTrue(lock.getQueuedThreads().contains(t2));
334	>	lock.release();
335	>	Thread.sleep(SHORT_DELAY_MS);
336	>	assertTrue(lock.getQueuedThreads().isEmpty());
337	>	t1.join();
338	>	t2.join();
339	>	}
340	>
341	>	/**
342	>	* drainPermits reports and removes given number of permits
343	>	*/
344	>	public void testDrainPermits() {
345	>	Semaphore s = new Semaphore(0, false);
346	>	assertEquals(0, s.availablePermits());
347	>	assertEquals(0, s.drainPermits());
348	>	s.release(10);
349	>	assertEquals(10, s.availablePermits());
350	>	assertEquals(10, s.drainPermits());
351	>	assertEquals(0, s.availablePermits());
352	>	assertEquals(0, s.drainPermits());
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() throws Exception {
371	>	Semaphore l = new Semaphore(3, false);
372	>	l.acquire();
373	>	l.release();
374	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
375	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
376	>	out.writeObject(l);
377	>	out.close();
378	>
379	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
380	>	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
381	>	Semaphore r = (Semaphore) in.readObject();
382	>	assertEquals(3, r.availablePermits());
383	>	assertFalse(r.isFair());
384	>	r.acquire();
385	>	r.release();
386	>	}
387	>
388	>
389	>	/**
390	>	* Zero, negative, and positive initial values are allowed in constructor
391	>	*/
392	>	public void testConstructor_fair() {
393	>	Semaphore s0 = new Semaphore(0, true);
394	>	assertEquals(0, s0.availablePermits());
395	>	assertTrue(s0.isFair());
396	>	Semaphore s1 = new Semaphore(-1, true);
397	>	assertEquals(-1, s1.availablePermits());
398	>	Semaphore s2 = new Semaphore(-1, true);
399	>	assertEquals(-1, s2.availablePermits());
400	>	}
401	>
402	>	/**
403	>	* tryAcquire succeeds when sufficient permits, else fails
404	>	*/
405	>	public void testTryAcquireInSameThread_fair() {
406	>	Semaphore s = new Semaphore(2, true);
407	>	assertEquals(2, s.availablePermits());
408	>	assertTrue(s.tryAcquire());
409	>	assertTrue(s.tryAcquire());
410	>	assertEquals(0, s.availablePermits());
411	>	assertFalse(s.tryAcquire());
412	>	}
413	>
414	>	/**
415	>	* tryAcquire(n) succeeds when sufficient permits, else fails
416	>	*/
417	>	public void testTryAcquireNInSameThread_fair() {
418	>	Semaphore s = new Semaphore(2, true);
419	>	assertEquals(2, s.availablePermits());
420	>	assertTrue(s.tryAcquire(2));
421	>	assertEquals(0, s.availablePermits());
422	>	assertFalse(s.tryAcquire());
423	>	}
424	>
425	>	/**
426	>	* Acquire and release of semaphore succeed if initially available
427	>	*/
428	>	public void testAcquireReleaseInSameThread_fair()
429	>	throws InterruptedException {
430	>	Semaphore s = new Semaphore(1, true);
431	>	s.acquire();
432	>	s.release();
433	>	s.acquire();
434	>	s.release();
435	>	s.acquire();
436	>	s.release();
437	>	s.acquire();
438	>	s.release();
439	>	s.acquire();
440	>	s.release();
441	>	assertEquals(1, s.availablePermits());
442	>	}
443	>
444	>	/**
445	>	* Acquire(n) and release(n) of semaphore succeed if initially available
446	>	*/
447	>	public void testAcquireReleaseNInSameThread_fair()
448	>	throws InterruptedException {
449	>	Semaphore s = new Semaphore(1, true);
450	>	s.release(1);
451	>	s.acquire(1);
452	>	s.release(2);
453	>	s.acquire(2);
454	>	s.release(3);
455	>	s.acquire(3);
456	>	s.release(4);
457	>	s.acquire(4);
458	>	s.release(5);
459	>	s.acquire(5);
460	>	assertEquals(1, s.availablePermits());
461	>	}
462	>
463	>	/**
464	>	* Acquire(n) and release(n) of semaphore succeed if initially available
465	>	*/
466	>	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
467	>	Semaphore s = new Semaphore(1, true);
468	>	s.release(1);
469	>	s.acquireUninterruptibly(1);
470	>	s.release(2);
471	>	s.acquireUninterruptibly(2);
472	>	s.release(3);
473	>	s.acquireUninterruptibly(3);
474	>	s.release(4);
475	>	s.acquireUninterruptibly(4);
476	>	s.release(5);
477	>	s.acquireUninterruptibly(5);
478	>	assertEquals(1, s.availablePermits());
479	>	}
480	>
481	>	/**
482	>	* release(n) in one thread enables timed acquire(n) in another thread
483	>	*/
484	>	public void testTimedAcquireReleaseNInSameThread_fair()
485	>	throws InterruptedException {
486	>	Semaphore s = new Semaphore(1, true);
487	>	s.release(1);
488	>	assertTrue(s.tryAcquire(1, SHORT_DELAY_MS, MILLISECONDS));
489	>	s.release(2);
490	>	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
491	>	s.release(3);
492	>	assertTrue(s.tryAcquire(3, SHORT_DELAY_MS, MILLISECONDS));
493	>	s.release(4);
494	>	assertTrue(s.tryAcquire(4, SHORT_DELAY_MS, MILLISECONDS));
495	>	s.release(5);
496	>	assertTrue(s.tryAcquire(5, SHORT_DELAY_MS, MILLISECONDS));
497	>	assertEquals(1, s.availablePermits());
498	>	}
499	>
500	>	/**
501	>	* release in one thread enables timed acquire in another thread
502	>	*/
503	>	public void testTimedAcquireReleaseInSameThread_fair()
504	>	throws InterruptedException {
505	>	Semaphore s = new Semaphore(1, true);
506	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
507	>	s.release();
508	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
509	>	s.release();
510	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
511	>	s.release();
512	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
513	>	s.release();
514	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
515	>	s.release();
516	>	assertEquals(1, s.availablePermits());
517	>	}
518	>
519	>	/**
520	>	* A release in one thread enables an acquire in another thread
521	>	*/
522	>	public void testAcquireReleaseInDifferentThreads_fair()
523	>	throws InterruptedException {
524	>	final Semaphore s = new Semaphore(0, true);
525	>	Thread t = new Thread(new CheckedRunnable() {
526	>	public void realRun() throws InterruptedException {
527	>	s.acquire();
528	>	s.acquire();
529	>	s.acquire();
530	>	s.acquire();
531	>	}});
532	>
533	>	t.start();
534	>	Thread.sleep(SHORT_DELAY_MS);
535	>	s.release();
536	>	s.release();
537	>	s.release();
538	>	s.release();
539	>	s.release();
540	>	s.release();
541	>	t.join();
542	>	assertEquals(2, s.availablePermits());
543	>	}
544	>
545	>	/**
546	>	* release(n) in one thread enables acquire(n) in another thread
547	>	*/
548	>	public void testAcquireReleaseNInDifferentThreads_fair()
549	>	throws InterruptedException {
550	>	final Semaphore s = new Semaphore(0, true);
551	>	Thread t = new Thread(new CheckedRunnable() {
552	>	public void realRun() throws InterruptedException {
553	>	s.acquire();
554	>	s.release(2);
555	>	s.acquire();
556	>	}});
557	>
558	>	t.start();
559	>	Thread.sleep(SHORT_DELAY_MS);
560	>	s.release(2);
561	>	s.acquire(2);
562	>	s.release(1);
563	>	t.join();
564	>	}
565	>
566	>	/**
567	>	* release(n) in one thread enables acquire(n) in another thread
568	>	*/
569	>	public void testAcquireReleaseNInDifferentThreads_fair2()
570	>	throws InterruptedException {
571	>	final Semaphore s = new Semaphore(0, true);
572	>	Thread t = new Thread(new CheckedRunnable() {
573	>	public void realRun() throws InterruptedException {
574	>	s.acquire(2);
575	>	s.acquire(2);
576	>	s.release(4);
577	>	}});
578	>
579	>	t.start();
580	>	Thread.sleep(SHORT_DELAY_MS);
581	>	s.release(6);
582	>	s.acquire(2);
583	>	s.acquire(2);
584	>	s.release(2);
585	>	t.join();
586	>	}
587	>
588	>
589	>	/**
590	>	* release in one thread enables timed acquire in another thread
591	>	*/
592	>	public void testTimedAcquireReleaseInDifferentThreads_fair()
593	>	throws InterruptedException {
594	>	final Semaphore s = new Semaphore(1, true);
595	>	Thread t = new Thread(new CheckedRunnable() {
596	>	public void realRun() throws InterruptedException {
597	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
598	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
599	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
600	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
601	>	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
602	>	}});
603	>
604	>	t.start();
605	>	s.release();
606	>	s.release();
607	>	s.release();
608	>	s.release();
609	>	s.release();
610	>	t.join();
611	>	}
612	>
613	>	/**
614	>	* release(n) in one thread enables timed acquire(n) in another thread
615	>	*/
616	>	public void testTimedAcquireReleaseNInDifferentThreads_fair()
617	>	throws InterruptedException {
618	>	final Semaphore s = new Semaphore(2, true);
619	>	Thread t = new Thread(new CheckedRunnable() {
620	>	public void realRun() throws InterruptedException {
621	>	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
622	>	s.release(2);
623	>	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
624	>	s.release(2);
625	>	}});
626	>
627	>	t.start();
628	>	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
629	>	s.release(2);
630	>	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
631	>	s.release(2);
632	>	t.join();
633	>	}
634	>
635	>	/**
636	>	* A waiting acquire blocks interruptibly
637	>	*/
638	>	public void testAcquire_InterruptedException_fair()
639	>	throws InterruptedException {
640	>	final Semaphore s = new Semaphore(0, true);
641	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
642	>	public void realRun() throws InterruptedException {
643	>	s.acquire();
644	>	}});
645	>
646	>	t.start();
647	>	Thread.sleep(SHORT_DELAY_MS);
648	>	t.interrupt();
649	>	t.join();
650	>	}
651	>
652	>	/**
653	>	* A waiting acquire(n) blocks interruptibly
654	>	*/
655	>	public void testAcquireN_InterruptedException_fair()
656	>	throws InterruptedException {
657	>	final Semaphore s = new Semaphore(2, true);
658	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
659	>	public void realRun() throws InterruptedException {
660	>	s.acquire(3);
661	>	}});
662	>
663	>	t.start();
664	>	Thread.sleep(SHORT_DELAY_MS);
665	>	t.interrupt();
666	>	t.join();
667	>	}
668	>
669	>	/**
670	>	* A waiting tryAcquire blocks interruptibly
671	>	*/
672	>	public void testTryAcquire_InterruptedException_fair()
673	>	throws InterruptedException {
674	>	final Semaphore s = new Semaphore(0, true);
675	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
676	>	public void realRun() throws InterruptedException {
677	>	s.tryAcquire(MEDIUM_DELAY_MS, MILLISECONDS);
678	>	}});
679	>
680	>	t.start();
681	>	Thread.sleep(SHORT_DELAY_MS);
682	>	t.interrupt();
683	>	t.join();
684	>	}
685	>
686	>	/**
687	>	* A waiting tryAcquire(n) blocks interruptibly
688	>	*/
689	>	public void testTryAcquireN_InterruptedException_fair()
690	>	throws InterruptedException {
691	>	final Semaphore s = new Semaphore(1, true);
692	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
693	>	public void realRun() throws InterruptedException {
694	>	s.tryAcquire(4, MEDIUM_DELAY_MS, MILLISECONDS);
695	>	}});
696	>
697	>	t.start();
698	>	Thread.sleep(SHORT_DELAY_MS);
699	>	t.interrupt();
700	>	t.join();
701	>	}
702	>
703	>	/**
704	>	* getQueueLength reports number of waiting threads
705	>	*/
706	>	public void testGetQueueLength_fair() throws InterruptedException {
707	>	final Semaphore lock = new Semaphore(1, true);
708	>	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
709	>	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
710	>	assertEquals(0, lock.getQueueLength());
711	>	lock.acquireUninterruptibly();
712	>	t1.start();
713	>	Thread.sleep(SHORT_DELAY_MS);
714	>	assertEquals(1, lock.getQueueLength());
715	>	t2.start();
716	>	Thread.sleep(SHORT_DELAY_MS);
717	>	assertEquals(2, lock.getQueueLength());
718	>	t1.interrupt();
719	>	Thread.sleep(SHORT_DELAY_MS);
720	>	assertEquals(1, lock.getQueueLength());
721	>	lock.release();
722	>	Thread.sleep(SHORT_DELAY_MS);
723	>	assertEquals(0, lock.getQueueLength());
724	>	t1.join();
725	>	t2.join();
726	>	}
727	>
728	>
729	>	/**
730	>	* a deserialized serialized semaphore has same number of permits
731	>	*/
732	>	public void testSerialization_fair() throws Exception {
733	>	Semaphore l = new Semaphore(3, true);
734	>
735	>	l.acquire();
736	>	l.release();
737	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
738	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
739	>	out.writeObject(l);
740	>	out.close();
741	>
742	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
743	>	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
744	>	Semaphore r = (Semaphore) in.readObject();
745	>	assertEquals(3, r.availablePermits());
746	>	assertTrue(r.isFair());
747	>	r.acquire();
748	>	r.release();
749	>	}
750	>
751	>	/**
752	>	* toString indicates current number of permits
753	>	*/
754	>	public void testToString() {
755	>	Semaphore s = new Semaphore(0);
756	>	String us = s.toString();
757	>	assertTrue(us.indexOf("Permits = 0") >= 0);
758	>	s.release();
759	>	String s1 = s.toString();
760	>	assertTrue(s1.indexOf("Permits = 1") >= 0);
761	>	s.release();
762	>	String s2 = s.toString();
763	>	assertTrue(s2.indexOf("Permits = 2") >= 0);
764		}
765
766		}

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