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

Comparing jsr166/src/test/tck/SemaphoreTest.java (file contents):
Revision 1.7 by dl, Sat Dec 27 19:26:43 2003 UTC vs.
Revision 1.29 by jsr166, Tue May 31 16:16:24 2011 UTC

#	Line 1 | Line 1
1		/*
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.
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
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.*;
11	>	import java.util.concurrent.CountDownLatch;
12	>	import java.util.concurrent.Semaphore;
13	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
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		}
19		public static Test suite() {
20	<	return new TestSuite(SemaphoreTest.class);
20	>	return new TestSuite(SemaphoreTest.class);
21		}
22
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();
27	>	PublicSemaphore(int permits) { super(permits); }
28	>	PublicSemaphore(int permits, boolean fair) { super(permits, fair); }
29	>	public Collection<Thread> getQueuedThreads() {
30	>	return super.getQueuedThreads();
31		}
32	<	public void reducePermits(int p) {
33	<	super.reducePermits(p);
32	>	public boolean hasQueuedThread(Thread t) {
33	>	return super.getQueuedThreads().contains(t);
34	>	}
35	>	public void reducePermits(int reduction) {
36	>	super.reducePermits(reduction);
37		}
38		}
39
40		/**
41		* A runnable calling acquire
42		*/
43	<	class InterruptibleLockRunnable implements Runnable {
43	>	class InterruptibleLockRunnable extends CheckedRunnable {
44		final Semaphore lock;
45	<	InterruptibleLockRunnable(Semaphore l) { lock = l; }
46	<	public void run() {
45	>	InterruptibleLockRunnable(Semaphore s) { lock = s; }
46	>	public void realRun() {
47		try {
48		lock.acquire();
49	<	} catch(InterruptedException success){}
49	>	}
50	>	catch (InterruptedException ignored) {}
51		}
52		}
53
48	–
54		/**
55	<	* A runnable calling acquire that expects to be
51	<	* interrupted
55	>	* A runnable calling acquire that expects to be interrupted
56		*/
57	<	class InterruptedLockRunnable implements Runnable {
57	>	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
58		final Semaphore lock;
59	<	InterruptedLockRunnable(Semaphore l) { lock = l; }
60	<	public void run() {
61	<	try {
62	<	lock.acquire();
63	<	threadShouldThrow();
64	<	} catch(InterruptedException success){}
59	>	InterruptedLockRunnable(Semaphore s) { lock = s; }
60	>	public void realRun() throws InterruptedException {
61	>	lock.acquire();
62	>	}
63	>	}
64	>
65	>	/**
66	>	* Spin-waits until s.hasQueuedThread(t) becomes true.
67	>	*/
68	>	void waitForQueuedThread(PublicSemaphore s, Thread t) {
69	>	long startTime = System.nanoTime();
70	>	while (!s.hasQueuedThread(t)) {
71	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
72	>	throw new AssertionFailedError("timed out");
73	>	Thread.yield();
74	>	}
75	>	assert(s.hasQueuedThreads());
76	>	assertTrue(t.isAlive());
77	>	}
78	>
79	>	/**
80	>	* Spin-waits until s.hasQueuedThreads() becomes true.
81	>	*/
82	>	void waitForQueuedThreads(Semaphore s) {
83	>	long startTime = System.nanoTime();
84	>	while (!s.hasQueuedThreads()) {
85	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
86	>	throw new AssertionFailedError("timed out");
87	>	Thread.yield();
88	>	}
89	>	}
90	>
91	>	enum AcquireMethod {
92	>	acquire() {
93	>	void acquire(Semaphore s) throws InterruptedException {
94	>	s.acquire();
95	>	}
96	>	},
97	>	acquireN() {
98	>	void acquire(Semaphore s, int permits) throws InterruptedException {
99	>	s.acquire(permits);
100	>	}
101	>	},
102	>	acquireUninterruptibly() {
103	>	void acquire(Semaphore s) {
104	>	s.acquireUninterruptibly();
105	>	}
106	>	},
107	>	acquireUninterruptiblyN() {
108	>	void acquire(Semaphore s, int permits) {
109	>	s.acquireUninterruptibly(permits);
110	>	}
111	>	},
112	>	tryAcquire() {
113	>	void acquire(Semaphore s) {
114	>	assertTrue(s.tryAcquire());
115	>	}
116	>	},
117	>	tryAcquireN() {
118	>	void acquire(Semaphore s, int permits) {
119	>	assertTrue(s.tryAcquire(permits));
120	>	}
121	>	},
122	>	tryAcquireTimed() {
123	>	void acquire(Semaphore s) throws InterruptedException {
124	>	assertTrue(s.tryAcquire(2 * LONG_DELAY_MS, MILLISECONDS));
125	>	}
126	>	},
127	>	tryAcquireTimedN {
128	>	void acquire(Semaphore s, int permits) throws InterruptedException {
129	>	assertTrue(s.tryAcquire(permits, 2 * LONG_DELAY_MS, MILLISECONDS));
130	>	}
131	>	};
132	>
133	>	// Intentionally meta-circular
134	>
135	>	/** Acquires 1 permit. */
136	>	void acquire(Semaphore s) throws InterruptedException {
137	>	acquire(s, 1);
138	>	}
139	>	/** Acquires the given number of permits. */
140	>	void acquire(Semaphore s, int permits) throws InterruptedException {
141	>	for (int i = 0; i < permits; i++)
142	>	acquire(s);
143		}
144		}
145
146		/**
147		* Zero, negative, and positive initial values are allowed in constructor
148		*/
149	<	public void testConstructor() {
150	<	Semaphore s0 = new Semaphore(0, false);
151	<	assertEquals(0, s0.availablePermits());
152	<	assertFalse(s0.isFair());
153	<	Semaphore s1 = new Semaphore(-1, false);
154	<	assertEquals(-1, s1.availablePermits());
155	<	Semaphore s2 = new Semaphore(-1, false);
156	<	assertEquals(-1, s2.availablePermits());
149	>	public void testConstructor()      { testConstructor(false); }
150	>	public void testConstructor_fair() { testConstructor(true); }
151	>	public void testConstructor(boolean fair) {
152	>	for (int permits : new int[] { -42, -1, 0, 1, 42 }) {
153	>	Semaphore s = new Semaphore(permits, fair);
154	>	assertEquals(permits, s.availablePermits());
155	>	assertEquals(fair, s.isFair());
156	>	}
157	>	}
158	>
159	>	/**
160	>	* Constructor without fairness argument behaves as nonfair
161	>	*/
162	>	public void testConstructorDefaultsToNonFair() {
163	>	for (int permits : new int[] { -42, -1, 0, 1, 42 }) {
164	>	Semaphore s = new Semaphore(permits);
165	>	assertEquals(permits, s.availablePermits());
166	>	assertFalse(s.isFair());
167	>	}
168		}
169
170		/**
171	<	* tryAcquire succeeds when sufficent permits, else fails
171	>	* tryAcquire succeeds when sufficient permits, else fails
172		*/
173	<	public void testTryAcquireInSameThread() {
174	<	Semaphore s = new Semaphore(2, false);
173	>	public void testTryAcquireInSameThread()      { testTryAcquireInSameThread(false); }
174	>	public void testTryAcquireInSameThread_fair() { testTryAcquireInSameThread(true); }
175	>	public void testTryAcquireInSameThread(boolean fair) {
176	>	Semaphore s = new Semaphore(2, fair);
177		assertEquals(2, s.availablePermits());
178		assertTrue(s.tryAcquire());
179		assertTrue(s.tryAcquire());
180		assertEquals(0, s.availablePermits());
181		assertFalse(s.tryAcquire());
182	+	assertFalse(s.tryAcquire());
183	+	assertEquals(0, s.availablePermits());
184		}
185
186		/**
187	<	* Acquire and release of semaphore succeed if initially available
187	>	* timed tryAcquire times out
188		*/
189	<	public void testAcquireReleaseInSameThread() {
190	<	Semaphore s = new Semaphore(1, false);
191	<	try {
192	<	s.acquire();
193	<	s.release();
194	<	s.acquire();
195	<	s.release();
196	<	s.acquire();
197	<	s.release();
198	<	s.acquire();
199	<	s.release();
200	<	s.acquire();
201	<	s.release();
202	<	assertEquals(1, s.availablePermits());
203	<	} catch( InterruptedException e){
204	<	unexpectedException();
205	<	}
189	>	public void testTryAcquire_timeout()      { testTryAcquire_timeout(false); }
190	>	public void testTryAcquire_timeout_fair() { testTryAcquire_timeout(true); }
191	>	public void testTryAcquire_timeout(boolean fair) {
192	>	Semaphore s = new Semaphore(0, fair);
193	>	long startTime = System.nanoTime();
194	>	try { assertFalse(s.tryAcquire(timeoutMillis(), MILLISECONDS)); }
195	>	catch (InterruptedException e) { threadUnexpectedException(e); }
196	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
197	>	}
198	>
199	>	/**
200	>	* timed tryAcquire(N) times out
201	>	*/
202	>	public void testTryAcquireN_timeout()      { testTryAcquireN_timeout(false); }
203	>	public void testTryAcquireN_timeout_fair() { testTryAcquireN_timeout(true); }
204	>	public void testTryAcquireN_timeout(boolean fair) {
205	>	Semaphore s = new Semaphore(2, fair);
206	>	long startTime = System.nanoTime();
207	>	try { assertFalse(s.tryAcquire(3, timeoutMillis(), MILLISECONDS)); }
208	>	catch (InterruptedException e) { threadUnexpectedException(e); }
209	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
210	>	}
211	>
212	>	/**
213	>	* acquire(), acquire(N), timed tryAcquired, timed tryAcquire(N)
214	>	* are interruptible
215	>	*/
216	>	public void testInterruptible_acquire()               { testInterruptible(false, AcquireMethod.acquire); }
217	>	public void testInterruptible_acquire_fair()          { testInterruptible(true,  AcquireMethod.acquire); }
218	>	public void testInterruptible_acquireN()              { testInterruptible(false, AcquireMethod.acquireN); }
219	>	public void testInterruptible_acquireN_fair()         { testInterruptible(true,  AcquireMethod.acquireN); }
220	>	public void testInterruptible_tryAcquireTimed()       { testInterruptible(false, AcquireMethod.tryAcquireTimed); }
221	>	public void testInterruptible_tryAcquireTimed_fair()  { testInterruptible(true,  AcquireMethod.tryAcquireTimed); }
222	>	public void testInterruptible_tryAcquireTimedN()      { testInterruptible(false, AcquireMethod.tryAcquireTimedN); }
223	>	public void testInterruptible_tryAcquireTimedN_fair() { testInterruptible(true,  AcquireMethod.tryAcquireTimedN); }
224	>	public void testInterruptible(boolean fair, final AcquireMethod acquirer) {
225	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
226	>	final Semaphore anotherInterruptPlease = new Semaphore(0, fair);
227	>	Thread t = newStartedThread(new CheckedRunnable() {
228	>	public void realRun() {
229	>	// Interrupt before acquire
230	>	Thread.currentThread().interrupt();
231	>	try {
232	>	acquirer.acquire(s);
233	>	shouldThrow();
234	>	} catch (InterruptedException success) {}
235	>
236	>	// Interrupt during acquire
237	>	try {
238	>	acquirer.acquire(s);
239	>	shouldThrow();
240	>	} catch (InterruptedException success) {}
241	>
242	>	// Interrupt before acquire(N)
243	>	Thread.currentThread().interrupt();
244	>	try {
245	>	acquirer.acquire(s, 3);
246	>	shouldThrow();
247	>	} catch (InterruptedException success) {}
248	>
249	>	anotherInterruptPlease.release();
250	>
251	>	// Interrupt during acquire(N)
252	>	try {
253	>	acquirer.acquire(s, 3);
254	>	shouldThrow();
255	>	} catch (InterruptedException success) {}
256	>	}});
257	>
258	>	waitForQueuedThread(s, t);
259	>	t.interrupt();
260	>	try {
261	>	assertTrue(anotherInterruptPlease.tryAcquire(LONG_DELAY_MS, MILLISECONDS));
262	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
263	>	waitForQueuedThread(s, t);
264	>	t.interrupt();
265	>	awaitTermination(t);
266	>	}
267	>
268	>	/**
269	>	* acquireUninterruptibly(), acquireUninterruptibly(N) are
270	>	* uninterruptible
271	>	*/
272	>	public void testUninterruptible_acquireUninterruptibly()       { testUninterruptible(false, AcquireMethod.acquireUninterruptibly); }
273	>	public void testUninterruptible_acquireUninterruptibly_fair()  { testUninterruptible(true,  AcquireMethod.acquireUninterruptibly); }
274	>	public void testUninterruptible_acquireUninterruptiblyN()      { testUninterruptible(false, AcquireMethod.acquireUninterruptiblyN); }
275	>	public void testUninterruptible_acquireUninterruptiblyN_fair() { testUninterruptible(true,  AcquireMethod.acquireUninterruptiblyN); }
276	>	public void testUninterruptible(boolean fair, final AcquireMethod acquirer) {
277	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
278	>	final Semaphore anotherInterruptPlease = new Semaphore(0, fair);
279	>	Thread t = newStartedThread(new CheckedRunnable() {
280	>	public void realRun() throws InterruptedException {
281	>	// Interrupt before acquire
282	>	Thread.currentThread().interrupt();
283	>	acquirer.acquire(s);
284	>	assertTrue(Thread.interrupted());
285	>
286	>	anotherInterruptPlease.release();
287	>
288	>	// Interrupt during acquire
289	>	acquirer.acquire(s);
290	>	assertTrue(Thread.interrupted());
291	>	}});
292	>
293	>	waitForQueuedThread(s, t);
294	>	assertThreadStaysAlive(t);
295	>	s.release();
296	>
297	>	try {
298	>	assertTrue(anotherInterruptPlease.tryAcquire(LONG_DELAY_MS, MILLISECONDS));
299	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
300	>	waitForQueuedThread(s, t);
301	>	t.interrupt();
302	>	assertThreadStaysAlive(t);
303	>	s.release();
304	>
305	>	awaitTermination(t);
306	>	}
307	>
308	>	/**
309	>	* hasQueuedThreads reports whether there are waiting threads
310	>	*/
311	>	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
312	>	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
313	>	public void testHasQueuedThreads(boolean fair) {
314	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
315	>	assertFalse(lock.hasQueuedThreads());
316	>	lock.acquireUninterruptibly();
317	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
318	>	waitForQueuedThread(lock, t1);
319	>	assertTrue(lock.hasQueuedThreads());
320	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
321	>	waitForQueuedThread(lock, t2);
322	>	assertTrue(lock.hasQueuedThreads());
323	>	t1.interrupt();
324	>	awaitTermination(t1);
325	>	assertTrue(lock.hasQueuedThreads());
326	>	lock.release();
327	>	awaitTermination(t2);
328	>	assertFalse(lock.hasQueuedThreads());
329		}
330
331		/**
332	<	* Uninterruptible acquire and release of semaphore succeed if
113	<	* initially available
332	>	* getQueueLength reports number of waiting threads
333		*/
334	<	public void testAcquireUninterruptiblyReleaseInSameThread() {
335	<	Semaphore s = new Semaphore(1, false);
336	<	try {
337	<	s.acquireUninterruptibly();
338	<	s.release();
339	<	s.acquireUninterruptibly();
340	<	s.release();
341	<	s.acquireUninterruptibly();
342	<	s.release();
343	<	s.acquireUninterruptibly();
344	<	s.release();
345	<	s.acquireUninterruptibly();
346	<	s.release();
347	<	assertEquals(1, s.availablePermits());
348	<	} finally {
349	<	}
334	>	public void testGetQueueLength()      { testGetQueueLength(false); }
335	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
336	>	public void testGetQueueLength(boolean fair) {
337	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
338	>	assertEquals(0, lock.getQueueLength());
339	>	lock.acquireUninterruptibly();
340	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
341	>	waitForQueuedThread(lock, t1);
342	>	assertEquals(1, lock.getQueueLength());
343	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
344	>	waitForQueuedThread(lock, t2);
345	>	assertEquals(2, lock.getQueueLength());
346	>	t1.interrupt();
347	>	awaitTermination(t1);
348	>	assertEquals(1, lock.getQueueLength());
349	>	lock.release();
350	>	awaitTermination(t2);
351	>	assertEquals(0, lock.getQueueLength());
352		}
353
354		/**
355	<	* Timed Acquire and release of semaphore succeed if
135	<	* initially available
355	>	* getQueuedThreads includes waiting threads
356		*/
357	<	public void testTimedAcquireReleaseInSameThread() {
358	<	Semaphore s = new Semaphore(1, false);
359	<	try {
360	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
361	<	s.release();
362	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
363	<	s.release();
364	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
365	<	s.release();
366	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
367	<	s.release();
368	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
369	<	s.release();
370	<	assertEquals(1, s.availablePermits());
371	<	} catch( InterruptedException e){
372	<	unexpectedException();
373	<	}
357	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
358	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
359	>	public void testGetQueuedThreads(boolean fair) {
360	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
361	>	assertTrue(lock.getQueuedThreads().isEmpty());
362	>	lock.acquireUninterruptibly();
363	>	assertTrue(lock.getQueuedThreads().isEmpty());
364	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
365	>	waitForQueuedThread(lock, t1);
366	>	assertTrue(lock.getQueuedThreads().contains(t1));
367	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
368	>	waitForQueuedThread(lock, t2);
369	>	assertTrue(lock.getQueuedThreads().contains(t1));
370	>	assertTrue(lock.getQueuedThreads().contains(t2));
371	>	t1.interrupt();
372	>	awaitTermination(t1);
373	>	assertFalse(lock.getQueuedThreads().contains(t1));
374	>	assertTrue(lock.getQueuedThreads().contains(t2));
375	>	lock.release();
376	>	awaitTermination(t2);
377	>	assertTrue(lock.getQueuedThreads().isEmpty());
378		}
379
380		/**
381	<	* A release in one thread enables an acquire in another thread
382	<	*/
383	<	public void testAcquireReleaseInDifferentThreads() {
384	<	final Semaphore s = new Semaphore(0, false);
385	<	Thread t = new Thread(new Runnable() {
386	<	public void run() {
387	<	try {
388	<	s.acquire();
389	<	s.release();
390	<	s.release();
391	<	s.acquire();
392	<	} catch(InterruptedException ie){
393	<	threadUnexpectedException();
170	<	}
171	<	}
172	<	});
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	<	}
381	>	* drainPermits reports and removes given number of permits
382	>	*/
383	>	public void testDrainPermits()      { testDrainPermits(false); }
384	>	public void testDrainPermits_fair() { testDrainPermits(true); }
385	>	public void testDrainPermits(boolean fair) {
386	>	Semaphore s = new Semaphore(0, fair);
387	>	assertEquals(0, s.availablePermits());
388	>	assertEquals(0, s.drainPermits());
389	>	s.release(10);
390	>	assertEquals(10, s.availablePermits());
391	>	assertEquals(10, s.drainPermits());
392	>	assertEquals(0, s.availablePermits());
393	>	assertEquals(0, s.drainPermits());
394		}
395
396		/**
397	<	* A release in one thread enables an uninterruptible acquire in another thread
397	>	* release(-N) throws IllegalArgumentException
398		*/
399	<	public void testUninterruptibleAcquireReleaseInDifferentThreads() {
400	<	final Semaphore s = new Semaphore(0, false);
401	<	Thread t = new Thread(new Runnable() {
402	<	public void run() {
194	<	s.acquireUninterruptibly();
195	<	s.release();
196	<	s.release();
197	<	s.acquireUninterruptibly();
198	<	}
199	<	});
399	>	public void testReleaseIAE()      { testReleaseIAE(false); }
400	>	public void testReleaseIAE_fair() { testReleaseIAE(true); }
401	>	public void testReleaseIAE(boolean fair) {
402	>	Semaphore s = new Semaphore(10, fair);
403		try {
404	<	t.start();
405	<	Thread.sleep(SHORT_DELAY_MS);
406	<	s.release();
204	<	s.release();
205	<	s.acquireUninterruptibly();
206	<	s.acquireUninterruptibly();
207	<	s.release();
208	<	t.join();
209	<	} catch( InterruptedException e){
210	<	unexpectedException();
211	<	}
404	>	s.release(-1);
405	>	shouldThrow();
406	>	} catch (IllegalArgumentException success) {}
407		}
408
214	–
409		/**
410	<	*  A release in one thread enables a timed acquire in another thread
410	>	* reducePermits(-N) throws IllegalArgumentException
411		*/
412	<	public void testTimedAcquireReleaseInDifferentThreads() {
413	<	final Semaphore s = new Semaphore(1, false);
414	<	Thread t = new Thread(new Runnable() {
415	<	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	<	});
412	>	public void testReducePermitsIAE()      { testReducePermitsIAE(false); }
413	>	public void testReducePermitsIAE_fair() { testReducePermitsIAE(true); }
414	>	public void testReducePermitsIAE(boolean fair) {
415	>	PublicSemaphore s = new PublicSemaphore(10, fair);
416		try {
417	<	t.start();
418	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
419	<	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	<	}
417	>	s.reducePermits(-1);
418	>	shouldThrow();
419	>	} catch (IllegalArgumentException success) {}
420		}
421
422		/**
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	–	/**
423		* reducePermits reduces number of permits
424		*/
425	<	public void testReducePermits() {
426	<	PublicSemaphore s = new PublicSemaphore(10, false);
425	>	public void testReducePermits()      { testReducePermits(false); }
426	>	public void testReducePermits_fair() { testReducePermits(true); }
427	>	public void testReducePermits(boolean fair) {
428	>	PublicSemaphore s = new PublicSemaphore(10, fair);
429	>	assertEquals(10, s.availablePermits());
430	>	s.reducePermits(0);
431		assertEquals(10, s.availablePermits());
432		s.reducePermits(1);
433		assertEquals(9, s.availablePermits());
434		s.reducePermits(10);
435		assertEquals(-1, s.availablePermits());
436	+	s.reducePermits(10);
437	+	assertEquals(-11, s.availablePermits());
438	+	s.reducePermits(0);
439	+	assertEquals(-11, s.availablePermits());
440		}
441
442		/**
443	<	* a deserialized serialized semaphore has same number of permits
443	>	* a reserialized semaphore has same number of permits and
444	>	* fairness, but no queued threads
445		*/
446	<	public void testSerialization() {
447	<	Semaphore l = new Semaphore(3, false);
446	>	public void testSerialization()      { testSerialization(false); }
447	>	public void testSerialization_fair() { testSerialization(true); }
448	>	public void testSerialization(boolean fair) {
449		try {
450	<	l.acquire();
451	<	l.release();
452	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
453	<	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	<	}
450	>	Semaphore s = new Semaphore(3, fair);
451	>	s.acquire();
452	>	s.acquire();
453	>	s.release();
454
455	+	Semaphore clone = serialClone(s);
456	+	assertEquals(fair, s.isFair());
457	+	assertEquals(fair, clone.isFair());
458	+	assertEquals(2, s.availablePermits());
459	+	assertEquals(2, clone.availablePermits());
460	+	clone.acquire();
461	+	clone.acquire();
462	+	clone.release();
463	+	assertEquals(2, s.availablePermits());
464	+	assertEquals(1, clone.availablePermits());
465
466	<	/**
467	<	* Zero, negative, and positive initial values are allowed in constructor
468	<	*/
469	<	public void testConstructor_fair() {
470	<	Semaphore s0 = new Semaphore(0, true);
471	<	assertEquals(0, s0.availablePermits());
472	<	assertTrue(s0.isFair());
473	<	Semaphore s1 = new Semaphore(-1, true);
474	<	assertEquals(-1, s1.availablePermits());
475	<	Semaphore s2 = new Semaphore(-1, true);
476	<	assertEquals(-1, s2.availablePermits());
466	>	s = new Semaphore(0, fair);
467	>	Thread t = newStartedThread(new InterruptibleLockRunnable(s));
468	>	waitForQueuedThreads(s);
469	>	clone = serialClone(s);
470	>	assertEquals(fair, s.isFair());
471	>	assertEquals(fair, clone.isFair());
472	>	assertEquals(0, s.availablePermits());
473	>	assertEquals(0, clone.availablePermits());
474	>	assertTrue(s.hasQueuedThreads());
475	>	assertFalse(clone.hasQueuedThreads());
476	>	s.release();
477	>	awaitTermination(t);
478	>	assertFalse(s.hasQueuedThreads());
479	>	assertFalse(clone.hasQueuedThreads());
480	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
481		}
482
483		/**
484	<	* tryAcquire succeeds when sufficent permits, else fails
485	<	*/
486	<	public void testTryAcquireInSameThread_fair() {
487	<	Semaphore s = new Semaphore(2, true);
484	>	* tryAcquire(n) succeeds when sufficient permits, else fails
485	>	*/
486	>	public void testTryAcquireNInSameThread()      { testTryAcquireNInSameThread(false); }
487	>	public void testTryAcquireNInSameThread_fair() { testTryAcquireNInSameThread(true); }
488	>	public void testTryAcquireNInSameThread(boolean fair) {
489	>	Semaphore s = new Semaphore(2, fair);
490		assertEquals(2, s.availablePermits());
491	<	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);
491	>	assertFalse(s.tryAcquire(3));
492		assertEquals(2, s.availablePermits());
493		assertTrue(s.tryAcquire(2));
494		assertEquals(0, s.availablePermits());
495	<	assertFalse(s.tryAcquire());
496	<	}
497	<
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	<	unexpectedException();
513	<	}
495	>	assertFalse(s.tryAcquire(1));
496	>	assertFalse(s.tryAcquire(2));
497	>	assertEquals(0, s.availablePermits());
498		}
499
500		/**
501	<	* release in one thread enables timed acquire in another thread
501	>	* acquire succeeds if permits available
502		*/
503	<	public void testTimedAcquireReleaseInSameThread_fair() {
504	<	Semaphore s = new Semaphore(1, true);
505	<	try {
506	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
507	<	s.release();
508	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
509	<	s.release();
510	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
511	<	s.release();
512	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
513	<	s.release();
514	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
515	<	s.release();
503	>	public void testReleaseAcquireSameThread_acquire()       { testReleaseAcquireSameThread(false, AcquireMethod.acquire); }
504	>	public void testReleaseAcquireSameThread_acquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquire); }
505	>	public void testReleaseAcquireSameThread_acquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireN); }
506	>	public void testReleaseAcquireSameThread_acquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireN); }
507	>	public void testReleaseAcquireSameThread_acquireUninterruptibly()       { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
508	>	public void testReleaseAcquireSameThread_acquireUninterruptibly_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
509	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
510	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
511	>	public void testReleaseAcquireSameThread_tryAcquire()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquire); }
512	>	public void testReleaseAcquireSameThread_tryAcquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquire); }
513	>	public void testReleaseAcquireSameThread_tryAcquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireN); }
514	>	public void testReleaseAcquireSameThread_tryAcquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireN); }
515	>	public void testReleaseAcquireSameThread_tryAcquireTimed()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimed); }
516	>	public void testReleaseAcquireSameThread_tryAcquireTimed_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimed); }
517	>	public void testReleaseAcquireSameThread_tryAcquireTimedN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimedN); }
518	>	public void testReleaseAcquireSameThread_tryAcquireTimedN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimedN); }
519	>	public void testReleaseAcquireSameThread(boolean fair,
520	>	final AcquireMethod acquirer) {
521	>	Semaphore s = new Semaphore(1, fair);
522	>	for (int i = 1; i < 6; i++) {
523	>	s.release(i);
524	>	assertEquals(1 + i, s.availablePermits());
525	>	try {
526	>	acquirer.acquire(s, i);
527	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
528		assertEquals(1, s.availablePermits());
533	–	} catch( InterruptedException e){
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();
529		}
530		}
531
532		/**
533	<	* release(n) in one thread enables acquire(n) in another thread
533	>	* release in one thread enables acquire in another thread
534		*/
535	<	public void testAcquireReleaseNInDifferentThreads_fair() {
536	<	final Semaphore s = new Semaphore(0, true);
537	<	Thread t = new Thread(new Runnable() {
538	<	public void run() {
539	<	try {
540	<	s.acquire(2);
541	<	s.acquire(2);
542	<	s.release(4);
543	<	} catch(InterruptedException ie){
544	<	threadUnexpectedException();
545	<	}
546	<	}
547	<	});
548	<	try {
549	<	t.start();
550	<	Thread.sleep(SHORT_DELAY_MS);
551	<	s.release(6);
552	<	s.acquire(2);
553	<	s.acquire(2);
554	<	s.release(2);
555	<	t.join();
556	<	} catch( InterruptedException e){
557	<	unexpectedException();
558	<	}
559	<	}
560	<
561	<
562	<
563	<	/**
564	<	* release in one thread enables timed acquire in another thread
565	<	*/
566	<	public void testTimedAcquireReleaseInDifferentThreads_fair() {
567	<	final Semaphore s = new Semaphore(1, true);
568	<	Thread t = new Thread(new Runnable() {
569	<	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 {
623	<	s.release();
624	<	s.release();
625	<	s.release();
626	<	s.release();
627	<	s.release();
628	<	t.join();
629	<	} catch( InterruptedException e){
630	<	unexpectedException();
631	<	}
632	<	}
633	<
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	<	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 {
701	<	Thread.sleep(SHORT_DELAY_MS);
702	<	t.interrupt();
703	<	t.join();
704	<	} catch(InterruptedException e){
705	<	unexpectedException();
706	<	}
707	<	}
708	<
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	<	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 {
749	<	Thread.sleep(SHORT_DELAY_MS);
750	<	t.interrupt();
751	<	t.join();
752	<	} catch(InterruptedException e){
753	<	unexpectedException();
535	>	public void testReleaseAcquireDifferentThreads_acquire()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquire); }
536	>	public void testReleaseAcquireDifferentThreads_acquire_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquire); }
537	>	public void testReleaseAcquireDifferentThreads_acquireN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireN); }
538	>	public void testReleaseAcquireDifferentThreads_acquireN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireN); }
539	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
540	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
541	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
542	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
543	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimed); }
544	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimed); }
545	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimedN); }
546	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimedN); }
547	>	public void testReleaseAcquireDifferentThreads(boolean fair,
548	>	final AcquireMethod acquirer) {
549	>	final Semaphore s = new Semaphore(0, fair);
550	>	final int rounds = 4;
551	>	long startTime = System.nanoTime();
552	>	Thread t = newStartedThread(new CheckedRunnable() {
553	>	public void realRun() throws InterruptedException {
554	>	for (int i = 0; i < rounds; i++) {
555	>	assertFalse(s.hasQueuedThreads());
556	>	if (i % 2 == 0)
557	>	acquirer.acquire(s);
558	>	else
559	>	acquirer.acquire(s, 3);
560	>	}}});
561	>
562	>	for (int i = 0; i < rounds; i++) {
563	>	while (! (s.availablePermits() == 0 && s.hasQueuedThreads()))
564	>	Thread.yield();
565	>	assertTrue(t.isAlive());
566	>	if (i % 2 == 0)
567	>	s.release();
568	>	else
569	>	s.release(3);
570		}
571	+	awaitTermination(t);
572	+	assertEquals(0, s.availablePermits());
573	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
574		}
575
576		/**
577	<	* 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
577	>	* fair locks are strictly FIFO
578		*/
579	<	public void testSerialization_fair() {
580	<	Semaphore l = new Semaphore(3, true);
581	<
582	<	try {
583	<	l.acquire();
584	<	l.release();
585	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
586	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
587	<	out.writeObject(l);
588	<	out.close();
589	<
590	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
591	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
592	<	Semaphore r = (Semaphore) in.readObject();
593	<	assertEquals(3, r.availablePermits());
594	<	assertTrue(r.isFair());
595	<	r.acquire();
596	<	r.release();
597	<	} catch(Exception e){
598	<	unexpectedException();
599	<	}
579	>	public void testFairLocksFifo() {
580	>	final PublicSemaphore s = new PublicSemaphore(1, true);
581	>	final CountDownLatch pleaseRelease = new CountDownLatch(1);
582	>	Thread t1 = newStartedThread(new CheckedRunnable() {
583	>	public void realRun() throws InterruptedException {
584	>	// Will block; permits are available, but not three
585	>	s.acquire(3);
586	>	}});
587	>
588	>	waitForQueuedThreads(s);
589	>
590	>	Thread t2 = newStartedThread(new CheckedRunnable() {
591	>	public void realRun() throws InterruptedException {
592	>	// Will fail, even though 1 permit is available
593	>	assertFalse(s.tryAcquire(0L, MILLISECONDS));
594	>	assertFalse(s.tryAcquire(1, 0L, MILLISECONDS));
595	>
596	>	// untimed tryAcquire will barge and succeed
597	>	assertTrue(s.tryAcquire());
598	>	s.release(2);
599	>	assertTrue(s.tryAcquire(2));
600	>	s.release();
601	>
602	>	pleaseRelease.countDown();
603	>	// Will queue up behind t1, even though 1 permit is available
604	>	s.acquire();
605	>	}});
606	>
607	>	await(pleaseRelease);
608	>	waitForQueuedThread(s, t2);
609	>	s.release(2);
610	>	awaitTermination(t1);
611	>	assertTrue(t2.isAlive());
612	>	s.release();
613	>	awaitTermination(t2);
614	>	}
615	>
616	>	/**
617	>	* toString indicates current number of permits
618	>	*/
619	>	public void testToString()      { testToString(false); }
620	>	public void testToString_fair() { testToString(true); }
621	>	public void testToString(boolean fair) {
622	>	PublicSemaphore s = new PublicSemaphore(0, fair);
623	>	assertTrue(s.toString().contains("Permits = 0"));
624	>	s.release();
625	>	assertTrue(s.toString().contains("Permits = 1"));
626	>	s.release(2);
627	>	assertTrue(s.toString().contains("Permits = 3"));
628	>	s.reducePermits(5);
629	>	assertTrue(s.toString().contains("Permits = -2"));
630		}
631
813	–
632		}

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