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

Comparing jsr166/src/test/tck/SemaphoreTest.java (file contents):
Revision 1.9 by dl, Mon Dec 29 19:05:40 2003 UTC vs.
Revision 1.34 by jsr166, Sat Apr 25 04:55:31 2015 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.*;
9	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
10	>
11	>	import java.util.Collection;
12	>	import java.util.concurrent.CountDownLatch;
13	>	import java.util.concurrent.Semaphore;
14	>
15	>	import junit.framework.AssertionFailedError;
16	>	import junit.framework.Test;
17	>	import junit.framework.TestSuite;
18
19		public class SemaphoreTest extends JSR166TestCase {
20		public static void main(String[] args) {
21	<	junit.textui.TestRunner.run (suite());
21	>	main(suite(), args);
22		}
23		public static Test suite() {
24	<	return new TestSuite(SemaphoreTest.class);
24	>	return new TestSuite(SemaphoreTest.class);
25		}
26
27		/**
28		* Subclass to expose protected methods
29		*/
30		static class PublicSemaphore extends Semaphore {
31	<	PublicSemaphore(int p, boolean f) { super(p, f); }
32	<	public Collection<Thread> getQueuedThreads() {
33	<	return super.getQueuedThreads();
31	>	PublicSemaphore(int permits) { super(permits); }
32	>	PublicSemaphore(int permits, boolean fair) { super(permits, fair); }
33	>	public Collection<Thread> getQueuedThreads() {
34	>	return super.getQueuedThreads();
35	>	}
36	>	public boolean hasQueuedThread(Thread t) {
37	>	return super.getQueuedThreads().contains(t);
38		}
39	<	public void reducePermits(int p) {
40	<	super.reducePermits(p);
39	>	public void reducePermits(int reduction) {
40	>	super.reducePermits(reduction);
41		}
42		}
43
44		/**
45		* A runnable calling acquire
46		*/
47	<	class InterruptibleLockRunnable implements Runnable {
47	>	class InterruptibleLockRunnable extends CheckedRunnable {
48		final Semaphore lock;
49	<	InterruptibleLockRunnable(Semaphore l) { lock = l; }
50	<	public void run() {
49	>	InterruptibleLockRunnable(Semaphore s) { lock = s; }
50	>	public void realRun() {
51		try {
52		lock.acquire();
53	<	} catch(InterruptedException success){}
53	>	}
54	>	catch (InterruptedException ignored) {}
55		}
56		}
57
48	–
58		/**
59	<	* A runnable calling acquire that expects to be
51	<	* interrupted
59	>	* A runnable calling acquire that expects to be interrupted
60		*/
61	<	class InterruptedLockRunnable implements Runnable {
61	>	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
62		final Semaphore lock;
63	<	InterruptedLockRunnable(Semaphore l) { lock = l; }
64	<	public void run() {
65	<	try {
66	<	lock.acquire();
67	<	threadShouldThrow();
68	<	} catch(InterruptedException success){}
63	>	InterruptedLockRunnable(Semaphore s) { lock = s; }
64	>	public void realRun() throws InterruptedException {
65	>	lock.acquire();
66	>	}
67	>	}
68	>
69	>	/**
70	>	* Spin-waits until s.hasQueuedThread(t) becomes true.
71	>	*/
72	>	void waitForQueuedThread(PublicSemaphore s, Thread t) {
73	>	long startTime = System.nanoTime();
74	>	while (!s.hasQueuedThread(t)) {
75	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
76	>	throw new AssertionFailedError("timed out");
77	>	Thread.yield();
78	>	}
79	>	assertTrue(s.hasQueuedThreads());
80	>	assertTrue(t.isAlive());
81	>	}
82	>
83	>	/**
84	>	* Spin-waits until s.hasQueuedThreads() becomes true.
85	>	*/
86	>	void waitForQueuedThreads(Semaphore s) {
87	>	long startTime = System.nanoTime();
88	>	while (!s.hasQueuedThreads()) {
89	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
90	>	throw new AssertionFailedError("timed out");
91	>	Thread.yield();
92	>	}
93	>	}
94	>
95	>	enum AcquireMethod {
96	>	acquire() {
97	>	void acquire(Semaphore s) throws InterruptedException {
98	>	s.acquire();
99	>	}
100	>	},
101	>	acquireN() {
102	>	void acquire(Semaphore s, int permits) throws InterruptedException {
103	>	s.acquire(permits);
104	>	}
105	>	},
106	>	acquireUninterruptibly() {
107	>	void acquire(Semaphore s) {
108	>	s.acquireUninterruptibly();
109	>	}
110	>	},
111	>	acquireUninterruptiblyN() {
112	>	void acquire(Semaphore s, int permits) {
113	>	s.acquireUninterruptibly(permits);
114	>	}
115	>	},
116	>	tryAcquire() {
117	>	void acquire(Semaphore s) {
118	>	assertTrue(s.tryAcquire());
119	>	}
120	>	},
121	>	tryAcquireN() {
122	>	void acquire(Semaphore s, int permits) {
123	>	assertTrue(s.tryAcquire(permits));
124	>	}
125	>	},
126	>	tryAcquireTimed() {
127	>	void acquire(Semaphore s) throws InterruptedException {
128	>	assertTrue(s.tryAcquire(2 * LONG_DELAY_MS, MILLISECONDS));
129	>	}
130	>	},
131	>	tryAcquireTimedN {
132	>	void acquire(Semaphore s, int permits) throws InterruptedException {
133	>	assertTrue(s.tryAcquire(permits, 2 * LONG_DELAY_MS, MILLISECONDS));
134	>	}
135	>	};
136	>
137	>	// Intentionally meta-circular
138	>
139	>	/** Acquires 1 permit. */
140	>	void acquire(Semaphore s) throws InterruptedException {
141	>	acquire(s, 1);
142	>	}
143	>	/** Acquires the given number of permits. */
144	>	void acquire(Semaphore s, int permits) throws InterruptedException {
145	>	for (int i = 0; i < permits; i++)
146	>	acquire(s);
147		}
148		}
149
150		/**
151		* Zero, negative, and positive initial values are allowed in constructor
152		*/
153	<	public void testConstructor() {
154	<	Semaphore s0 = new Semaphore(0, false);
155	<	assertEquals(0, s0.availablePermits());
156	<	assertFalse(s0.isFair());
157	<	Semaphore s1 = new Semaphore(-1, false);
158	<	assertEquals(-1, s1.availablePermits());
159	<	Semaphore s2 = new Semaphore(-1, false);
160	<	assertEquals(-1, s2.availablePermits());
153	>	public void testConstructor()      { testConstructor(false); }
154	>	public void testConstructor_fair() { testConstructor(true); }
155	>	public void testConstructor(boolean fair) {
156	>	for (int permits : new int[] { -42, -1, 0, 1, 42 }) {
157	>	Semaphore s = new Semaphore(permits, fair);
158	>	assertEquals(permits, s.availablePermits());
159	>	assertEquals(fair, s.isFair());
160	>	}
161	>	}
162	>
163	>	/**
164	>	* Constructor without fairness argument behaves as nonfair
165	>	*/
166	>	public void testConstructorDefaultsToNonFair() {
167	>	for (int permits : new int[] { -42, -1, 0, 1, 42 }) {
168	>	Semaphore s = new Semaphore(permits);
169	>	assertEquals(permits, s.availablePermits());
170	>	assertFalse(s.isFair());
171	>	}
172		}
173
174		/**
175		* tryAcquire succeeds when sufficient permits, else fails
176		*/
177	<	public void testTryAcquireInSameThread() {
178	<	Semaphore s = new Semaphore(2, false);
177	>	public void testTryAcquireInSameThread()      { testTryAcquireInSameThread(false); }
178	>	public void testTryAcquireInSameThread_fair() { testTryAcquireInSameThread(true); }
179	>	public void testTryAcquireInSameThread(boolean fair) {
180	>	Semaphore s = new Semaphore(2, fair);
181		assertEquals(2, s.availablePermits());
182		assertTrue(s.tryAcquire());
183		assertTrue(s.tryAcquire());
184		assertEquals(0, s.availablePermits());
185		assertFalse(s.tryAcquire());
186	+	assertFalse(s.tryAcquire());
187	+	assertEquals(0, s.availablePermits());
188		}
189
190		/**
191	<	* Acquire and release of semaphore succeed if initially available
191	>	* timed tryAcquire times out
192		*/
193	<	public void testAcquireReleaseInSameThread() {
194	<	Semaphore s = new Semaphore(1, false);
195	<	try {
196	<	s.acquire();
197	<	s.release();
198	<	s.acquire();
199	<	s.release();
200	<	s.acquire();
201	<	s.release();
202	<	s.acquire();
203	<	s.release();
204	<	s.acquire();
205	<	s.release();
206	<	assertEquals(1, s.availablePermits());
207	<	} catch( InterruptedException e){
208	<	unexpectedException();
209	<	}
210	<	}
193	>	public void testTryAcquire_timeout()      { testTryAcquire_timeout(false); }
194	>	public void testTryAcquire_timeout_fair() { testTryAcquire_timeout(true); }
195	>	public void testTryAcquire_timeout(boolean fair) {
196	>	Semaphore s = new Semaphore(0, fair);
197	>	long startTime = System.nanoTime();
198	>	try { assertFalse(s.tryAcquire(timeoutMillis(), MILLISECONDS)); }
199	>	catch (InterruptedException e) { threadUnexpectedException(e); }
200	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
201	>	}
202	>
203	>	/**
204	>	* timed tryAcquire(N) times out
205	>	*/
206	>	public void testTryAcquireN_timeout()      { testTryAcquireN_timeout(false); }
207	>	public void testTryAcquireN_timeout_fair() { testTryAcquireN_timeout(true); }
208	>	public void testTryAcquireN_timeout(boolean fair) {
209	>	Semaphore s = new Semaphore(2, fair);
210	>	long startTime = System.nanoTime();
211	>	try { assertFalse(s.tryAcquire(3, timeoutMillis(), MILLISECONDS)); }
212	>	catch (InterruptedException e) { threadUnexpectedException(e); }
213	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
214	>	}
215	>
216	>	/**
217	>	* acquire(), acquire(N), timed tryAcquired, timed tryAcquire(N)
218	>	* are interruptible
219	>	*/
220	>	public void testInterruptible_acquire()               { testInterruptible(false, AcquireMethod.acquire); }
221	>	public void testInterruptible_acquire_fair()          { testInterruptible(true,  AcquireMethod.acquire); }
222	>	public void testInterruptible_acquireN()              { testInterruptible(false, AcquireMethod.acquireN); }
223	>	public void testInterruptible_acquireN_fair()         { testInterruptible(true,  AcquireMethod.acquireN); }
224	>	public void testInterruptible_tryAcquireTimed()       { testInterruptible(false, AcquireMethod.tryAcquireTimed); }
225	>	public void testInterruptible_tryAcquireTimed_fair()  { testInterruptible(true,  AcquireMethod.tryAcquireTimed); }
226	>	public void testInterruptible_tryAcquireTimedN()      { testInterruptible(false, AcquireMethod.tryAcquireTimedN); }
227	>	public void testInterruptible_tryAcquireTimedN_fair() { testInterruptible(true,  AcquireMethod.tryAcquireTimedN); }
228	>	public void testInterruptible(boolean fair, final AcquireMethod acquirer) {
229	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
230	>	final Semaphore pleaseInterrupt = new Semaphore(0, fair);
231	>	Thread t = newStartedThread(new CheckedRunnable() {
232	>	public void realRun() {
233	>	// Interrupt before acquire
234	>	Thread.currentThread().interrupt();
235	>	try {
236	>	acquirer.acquire(s);
237	>	shouldThrow();
238	>	} catch (InterruptedException success) {}
239	>
240	>	// Interrupt during acquire
241	>	try {
242	>	acquirer.acquire(s);
243	>	shouldThrow();
244	>	} catch (InterruptedException success) {}
245	>
246	>	// Interrupt before acquire(N)
247	>	Thread.currentThread().interrupt();
248	>	try {
249	>	acquirer.acquire(s, 3);
250	>	shouldThrow();
251	>	} catch (InterruptedException success) {}
252	>
253	>	pleaseInterrupt.release();
254	>
255	>	// Interrupt during acquire(N)
256	>	try {
257	>	acquirer.acquire(s, 3);
258	>	shouldThrow();
259	>	} catch (InterruptedException success) {}
260	>	}});
261	>
262	>	waitForQueuedThread(s, t);
263	>	t.interrupt();
264	>	await(pleaseInterrupt);
265	>	waitForQueuedThread(s, t);
266	>	t.interrupt();
267	>	awaitTermination(t);
268	>	}
269	>
270	>	/**
271	>	* acquireUninterruptibly(), acquireUninterruptibly(N) are
272	>	* uninterruptible
273	>	*/
274	>	public void testUninterruptible_acquireUninterruptibly()       { testUninterruptible(false, AcquireMethod.acquireUninterruptibly); }
275	>	public void testUninterruptible_acquireUninterruptibly_fair()  { testUninterruptible(true,  AcquireMethod.acquireUninterruptibly); }
276	>	public void testUninterruptible_acquireUninterruptiblyN()      { testUninterruptible(false, AcquireMethod.acquireUninterruptiblyN); }
277	>	public void testUninterruptible_acquireUninterruptiblyN_fair() { testUninterruptible(true,  AcquireMethod.acquireUninterruptiblyN); }
278	>	public void testUninterruptible(boolean fair, final AcquireMethod acquirer) {
279	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
280	>	final Semaphore pleaseInterrupt = new Semaphore(-1, fair);
281	>
282	>	Thread t1 = newStartedThread(new CheckedRunnable() {
283	>	public void realRun() throws InterruptedException {
284	>	// Interrupt before acquire
285	>	pleaseInterrupt.release();
286	>	Thread.currentThread().interrupt();
287	>	acquirer.acquire(s);
288	>	assertTrue(Thread.interrupted());
289	>	}});
290	>
291	>	Thread t2 = newStartedThread(new CheckedRunnable() {
292	>	public void realRun() throws InterruptedException {
293	>	// Interrupt during acquire
294	>	pleaseInterrupt.release();
295	>	acquirer.acquire(s);
296	>	assertTrue(Thread.interrupted());
297	>	}});
298	>
299	>	await(pleaseInterrupt);
300	>	waitForQueuedThread(s, t1);
301	>	waitForQueuedThread(s, t2);
302	>	t2.interrupt();
303
304	<	/**
305	<	* 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();
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	<	assertEquals(1, s.availablePermits());
129	<	} finally {
130	<	}
131	<	}
304	>	assertThreadStaysAlive(t1);
305	>	assertTrue(t2.isAlive());
306
307	<	/**
308	<	* Timed Acquire and release of semaphore succeed if
309	<	* initially available
310	<	*/
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	<	}
307	>	s.release(2);
308	>
309	>	awaitTermination(t1);
310	>	awaitTermination(t2);
311		}
312
313		/**
314	<	* A release in one thread enables an acquire in another thread
314	>	* hasQueuedThreads reports whether there are waiting threads
315		*/
316	<	public void testAcquireReleaseInDifferentThreads() {
317	<	final Semaphore s = new Semaphore(0, false);
318	<	Thread t = new Thread(new Runnable() {
319	<	public void run() {
320	<	try {
321	<	s.acquire();
322	<	s.release();
323	<	s.release();
324	<	s.acquire();
325	<	} catch(InterruptedException ie){
326	<	threadUnexpectedException();
327	<	}
328	<	}
329	<	});
330	<	try {
331	<	t.start();
332	<	Thread.sleep(SHORT_DELAY_MS);
333	<	s.release();
177	<	s.release();
178	<	s.acquire();
179	<	s.acquire();
180	<	s.release();
181	<	t.join();
182	<	} catch( InterruptedException e){
183	<	unexpectedException();
184	<	}
316	>	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
317	>	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
318	>	public void testHasQueuedThreads(boolean fair) {
319	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
320	>	assertFalse(lock.hasQueuedThreads());
321	>	lock.acquireUninterruptibly();
322	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
323	>	waitForQueuedThread(lock, t1);
324	>	assertTrue(lock.hasQueuedThreads());
325	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
326	>	waitForQueuedThread(lock, t2);
327	>	assertTrue(lock.hasQueuedThreads());
328	>	t1.interrupt();
329	>	awaitTermination(t1);
330	>	assertTrue(lock.hasQueuedThreads());
331	>	lock.release();
332	>	awaitTermination(t2);
333	>	assertFalse(lock.hasQueuedThreads());
334		}
335
336		/**
337	<	* A release in one thread enables an uninterruptible acquire in another thread
337	>	* getQueueLength reports number of waiting threads
338		*/
339	<	public void testUninterruptibleAcquireReleaseInDifferentThreads() {
340	<	final Semaphore s = new Semaphore(0, false);
341	<	Thread t = new Thread(new Runnable() {
342	<	public void run() {
343	<	s.acquireUninterruptibly();
344	<	s.release();
345	<	s.release();
346	<	s.acquireUninterruptibly();
347	<	}
348	<	});
349	<	try {
350	<	t.start();
351	<	Thread.sleep(SHORT_DELAY_MS);
352	<	s.release();
353	<	s.release();
354	<	s.acquireUninterruptibly();
355	<	s.acquireUninterruptibly();
356	<	s.release();
208	<	t.join();
209	<	} catch( InterruptedException e){
210	<	unexpectedException();
211	<	}
339	>	public void testGetQueueLength()      { testGetQueueLength(false); }
340	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
341	>	public void testGetQueueLength(boolean fair) {
342	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
343	>	assertEquals(0, lock.getQueueLength());
344	>	lock.acquireUninterruptibly();
345	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
346	>	waitForQueuedThread(lock, t1);
347	>	assertEquals(1, lock.getQueueLength());
348	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
349	>	waitForQueuedThread(lock, t2);
350	>	assertEquals(2, lock.getQueueLength());
351	>	t1.interrupt();
352	>	awaitTermination(t1);
353	>	assertEquals(1, lock.getQueueLength());
354	>	lock.release();
355	>	awaitTermination(t2);
356	>	assertEquals(0, lock.getQueueLength());
357		}
358
214	–
359		/**
360	<	*  A release in one thread enables a timed acquire in another thread
360	>	* getQueuedThreads includes waiting threads
361		*/
362	<	public void testTimedAcquireReleaseInDifferentThreads() {
363	<	final Semaphore s = new Semaphore(1, false);
364	<	Thread t = new Thread(new Runnable() {
365	<	public void run() {
366	<	try {
367	<	s.release();
368	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
369	<	s.release();
370	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
371	<
372	<	} catch(InterruptedException ie){
373	<	threadUnexpectedException();
374	<	}
375	<	}
376	<	});
377	<	try {
378	<	t.start();
379	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
380	<	s.release();
381	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
382	<	s.release();
239	<	s.release();
240	<	t.join();
241	<	} catch( InterruptedException e){
242	<	unexpectedException();
243	<	}
362	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
363	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
364	>	public void testGetQueuedThreads(boolean fair) {
365	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
366	>	assertTrue(lock.getQueuedThreads().isEmpty());
367	>	lock.acquireUninterruptibly();
368	>	assertTrue(lock.getQueuedThreads().isEmpty());
369	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
370	>	waitForQueuedThread(lock, t1);
371	>	assertTrue(lock.getQueuedThreads().contains(t1));
372	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
373	>	waitForQueuedThread(lock, t2);
374	>	assertTrue(lock.getQueuedThreads().contains(t1));
375	>	assertTrue(lock.getQueuedThreads().contains(t2));
376	>	t1.interrupt();
377	>	awaitTermination(t1);
378	>	assertFalse(lock.getQueuedThreads().contains(t1));
379	>	assertTrue(lock.getQueuedThreads().contains(t2));
380	>	lock.release();
381	>	awaitTermination(t2);
382	>	assertTrue(lock.getQueuedThreads().isEmpty());
383		}
384
385		/**
386	<	* A waiting acquire blocks interruptibly
387	<	*/
388	<	public void testAcquire_InterruptedException() {
389	<	final Semaphore s = new Semaphore(0, false);
390	<	Thread t = new Thread(new Runnable() {
391	<	public void run() {
392	<	try {
393	<	s.acquire();
394	<	threadShouldThrow();
395	<	} catch(InterruptedException success){}
396	<	}
397	<	});
398	<	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	<	}
386	>	* drainPermits reports and removes given number of permits
387	>	*/
388	>	public void testDrainPermits()      { testDrainPermits(false); }
389	>	public void testDrainPermits_fair() { testDrainPermits(true); }
390	>	public void testDrainPermits(boolean fair) {
391	>	Semaphore s = new Semaphore(0, fair);
392	>	assertEquals(0, s.availablePermits());
393	>	assertEquals(0, s.drainPermits());
394	>	s.release(10);
395	>	assertEquals(10, s.availablePermits());
396	>	assertEquals(10, s.drainPermits());
397	>	assertEquals(0, s.availablePermits());
398	>	assertEquals(0, s.drainPermits());
399		}
400
401		/**
402	<	* 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
402	>	* release(-N) throws IllegalArgumentException
403		*/
404	<	public void testGetQueueLength() {
405	<	final Semaphore lock = new Semaphore(1, false);
406	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
407	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
404	>	public void testReleaseIAE()      { testReleaseIAE(false); }
405	>	public void testReleaseIAE_fair() { testReleaseIAE(true); }
406	>	public void testReleaseIAE(boolean fair) {
407	>	Semaphore s = new Semaphore(10, fair);
408		try {
409	<	assertEquals(0, lock.getQueueLength());
410	<	lock.acquireUninterruptibly();
411	<	t1.start();
412	<	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	<	}
409	>	s.release(-1);
410	>	shouldThrow();
411	>	} catch (IllegalArgumentException success) {}
412	>	}
413
414		/**
415	<	* getQueuedThreads includes waiting threads
415	>	* reducePermits(-N) throws IllegalArgumentException
416		*/
417	<	public void testGetQueuedThreads() {
418	<	final PublicSemaphore lock = new PublicSemaphore(1, false);
419	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
420	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
417	>	public void testReducePermitsIAE()      { testReducePermitsIAE(false); }
418	>	public void testReducePermitsIAE_fair() { testReducePermitsIAE(true); }
419	>	public void testReducePermitsIAE(boolean fair) {
420	>	PublicSemaphore s = new PublicSemaphore(10, fair);
421		try {
422	<	assertTrue(lock.getQueuedThreads().isEmpty());
423	<	lock.acquireUninterruptibly();
424	<	assertTrue(lock.getQueuedThreads().isEmpty());
425	<	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	<
422	>	s.reducePermits(-1);
423	>	shouldThrow();
424	>	} catch (IllegalArgumentException success) {}
425	>	}
426
427		/**
428		* reducePermits reduces number of permits
429		*/
430	<	public void testReducePermits() {
431	<	PublicSemaphore s = new PublicSemaphore(10, false);
430	>	public void testReducePermits()      { testReducePermits(false); }
431	>	public void testReducePermits_fair() { testReducePermits(true); }
432	>	public void testReducePermits(boolean fair) {
433	>	PublicSemaphore s = new PublicSemaphore(10, fair);
434	>	assertEquals(10, s.availablePermits());
435	>	s.reducePermits(0);
436		assertEquals(10, s.availablePermits());
437		s.reducePermits(1);
438		assertEquals(9, s.availablePermits());
439		s.reducePermits(10);
440		assertEquals(-1, s.availablePermits());
441	+	s.reducePermits(10);
442	+	assertEquals(-11, s.availablePermits());
443	+	s.reducePermits(0);
444	+	assertEquals(-11, s.availablePermits());
445		}
446
447		/**
448	<	* a deserialized serialized semaphore has same number of permits
448	>	* a reserialized semaphore has same number of permits and
449	>	* fairness, but no queued threads
450		*/
451	<	public void testSerialization() {
452	<	Semaphore l = new Semaphore(3, false);
451	>	public void testSerialization()      { testSerialization(false); }
452	>	public void testSerialization_fair() { testSerialization(true); }
453	>	public void testSerialization(boolean fair) {
454		try {
455	<	l.acquire();
456	<	l.release();
457	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
458	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
406	<	out.writeObject(l);
407	<	out.close();
408	<
409	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
410	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
411	<	Semaphore r = (Semaphore) in.readObject();
412	<	assertEquals(3, r.availablePermits());
413	<	assertFalse(r.isFair());
414	<	r.acquire();
415	<	r.release();
416	<	} catch(Exception e){
417	<	unexpectedException();
418	<	}
419	<	}
420	<
455	>	Semaphore s = new Semaphore(3, fair);
456	>	s.acquire();
457	>	s.acquire();
458	>	s.release();
459
460	<	/**
461	<	* Zero, negative, and positive initial values are allowed in constructor
462	<	*/
463	<	public void testConstructor_fair() {
464	<	Semaphore s0 = new Semaphore(0, true);
465	<	assertEquals(0, s0.availablePermits());
466	<	assertTrue(s0.isFair());
467	<	Semaphore s1 = new Semaphore(-1, true);
468	<	assertEquals(-1, s1.availablePermits());
469	<	Semaphore s2 = new Semaphore(-1, true);
432	<	assertEquals(-1, s2.availablePermits());
433	<	}
460	>	Semaphore clone = serialClone(s);
461	>	assertEquals(fair, s.isFair());
462	>	assertEquals(fair, clone.isFair());
463	>	assertEquals(2, s.availablePermits());
464	>	assertEquals(2, clone.availablePermits());
465	>	clone.acquire();
466	>	clone.acquire();
467	>	clone.release();
468	>	assertEquals(2, s.availablePermits());
469	>	assertEquals(1, clone.availablePermits());
470
471	<	/**
472	<	* tryAcquire succeeds when sufficient permits, else fails
473	<	*/
474	<	public void testTryAcquireInSameThread_fair() {
475	<	Semaphore s = new Semaphore(2, true);
476	<	assertEquals(2, s.availablePermits());
477	<	assertTrue(s.tryAcquire());
478	<	assertTrue(s.tryAcquire());
479	<	assertEquals(0, s.availablePermits());
480	<	assertFalse(s.tryAcquire());
471	>	s = new Semaphore(0, fair);
472	>	Thread t = newStartedThread(new InterruptibleLockRunnable(s));
473	>	waitForQueuedThreads(s);
474	>	clone = serialClone(s);
475	>	assertEquals(fair, s.isFair());
476	>	assertEquals(fair, clone.isFair());
477	>	assertEquals(0, s.availablePermits());
478	>	assertEquals(0, clone.availablePermits());
479	>	assertTrue(s.hasQueuedThreads());
480	>	assertFalse(clone.hasQueuedThreads());
481	>	s.release();
482	>	awaitTermination(t);
483	>	assertFalse(s.hasQueuedThreads());
484	>	assertFalse(clone.hasQueuedThreads());
485	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
486		}
487
488		/**
489		* tryAcquire(n) succeeds when sufficient permits, else fails
490		*/
491	<	public void testTryAcquireNInSameThread_fair() {
492	<	Semaphore s = new Semaphore(2, true);
491	>	public void testTryAcquireNInSameThread()      { testTryAcquireNInSameThread(false); }
492	>	public void testTryAcquireNInSameThread_fair() { testTryAcquireNInSameThread(true); }
493	>	public void testTryAcquireNInSameThread(boolean fair) {
494	>	Semaphore s = new Semaphore(2, fair);
495	>	assertEquals(2, s.availablePermits());
496	>	assertFalse(s.tryAcquire(3));
497		assertEquals(2, s.availablePermits());
498		assertTrue(s.tryAcquire(2));
499		assertEquals(0, s.availablePermits());
500	<	assertFalse(s.tryAcquire());
501	<	}
502	<
458	<	/**
459	<	* Acquire and release of semaphore succeed if initially available
460	<	*/
461	<	public void testAcquireReleaseInSameThread_fair() {
462	<	Semaphore s = new Semaphore(1, true);
463	<	try {
464	<	s.acquire();
465	<	s.release();
466	<	s.acquire();
467	<	s.release();
468	<	s.acquire();
469	<	s.release();
470	<	s.acquire();
471	<	s.release();
472	<	s.acquire();
473	<	s.release();
474	<	assertEquals(1, s.availablePermits());
475	<	} catch( InterruptedException e){
476	<	unexpectedException();
477	<	}
478	<	}
479	<
480	<	/**
481	<	* Acquire(n) and release(n) of semaphore succeed if initially available
482	<	*/
483	<	public void testAcquireReleaseNInSameThread_fair() {
484	<	Semaphore s = new Semaphore(1, true);
485	<	try {
486	<	s.release(1);
487	<	s.acquire(1);
488	<	s.release(2);
489	<	s.acquire(2);
490	<	s.release(3);
491	<	s.acquire(3);
492	<	s.release(4);
493	<	s.acquire(4);
494	<	s.release(5);
495	<	s.acquire(5);
496	<	assertEquals(1, s.availablePermits());
497	<	} catch( InterruptedException e){
498	<	unexpectedException();
499	<	}
500	<	}
501	<
502	<	/**
503	<	* Acquire(n) and release(n) of semaphore succeed if initially available
504	<	*/
505	<	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
506	<	Semaphore s = new Semaphore(1, true);
507	<	try {
508	<	s.release(1);
509	<	s.acquireUninterruptibly(1);
510	<	s.release(2);
511	<	s.acquireUninterruptibly(2);
512	<	s.release(3);
513	<	s.acquireUninterruptibly(3);
514	<	s.release(4);
515	<	s.acquireUninterruptibly(4);
516	<	s.release(5);
517	<	s.acquireUninterruptibly(5);
518	<	assertEquals(1, s.availablePermits());
519	<	} finally {
520	<	}
521	<	}
522	<
523	<	/**
524	<	* release(n) in one thread enables timed acquire(n) in another thread
525	<	*/
526	<	public void testTimedAcquireReleaseNInSameThread_fair() {
527	<	Semaphore s = new Semaphore(1, true);
528	<	try {
529	<	s.release(1);
530	<	assertTrue(s.tryAcquire(1, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
531	<	s.release(2);
532	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
533	<	s.release(3);
534	<	assertTrue(s.tryAcquire(3, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
535	<	s.release(4);
536	<	assertTrue(s.tryAcquire(4, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
537	<	s.release(5);
538	<	assertTrue(s.tryAcquire(5, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
539	<	assertEquals(1, s.availablePermits());
540	<	} catch( InterruptedException e){
541	<	unexpectedException();
542	<	}
500	>	assertFalse(s.tryAcquire(1));
501	>	assertFalse(s.tryAcquire(2));
502	>	assertEquals(0, s.availablePermits());
503		}
504
505		/**
506	<	* release in one thread enables timed acquire in another thread
506	>	* acquire succeeds if permits available
507		*/
508	<	public void testTimedAcquireReleaseInSameThread_fair() {
509	<	Semaphore s = new Semaphore(1, true);
510	<	try {
511	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
512	<	s.release();
513	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
514	<	s.release();
515	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
516	<	s.release();
517	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
518	<	s.release();
519	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
520	<	s.release();
508	>	public void testReleaseAcquireSameThread_acquire()       { testReleaseAcquireSameThread(false, AcquireMethod.acquire); }
509	>	public void testReleaseAcquireSameThread_acquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquire); }
510	>	public void testReleaseAcquireSameThread_acquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireN); }
511	>	public void testReleaseAcquireSameThread_acquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireN); }
512	>	public void testReleaseAcquireSameThread_acquireUninterruptibly()       { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
513	>	public void testReleaseAcquireSameThread_acquireUninterruptibly_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
514	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
515	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
516	>	public void testReleaseAcquireSameThread_tryAcquire()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquire); }
517	>	public void testReleaseAcquireSameThread_tryAcquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquire); }
518	>	public void testReleaseAcquireSameThread_tryAcquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireN); }
519	>	public void testReleaseAcquireSameThread_tryAcquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireN); }
520	>	public void testReleaseAcquireSameThread_tryAcquireTimed()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimed); }
521	>	public void testReleaseAcquireSameThread_tryAcquireTimed_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimed); }
522	>	public void testReleaseAcquireSameThread_tryAcquireTimedN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimedN); }
523	>	public void testReleaseAcquireSameThread_tryAcquireTimedN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimedN); }
524	>	public void testReleaseAcquireSameThread(boolean fair,
525	>	final AcquireMethod acquirer) {
526	>	Semaphore s = new Semaphore(1, fair);
527	>	for (int i = 1; i < 6; i++) {
528	>	s.release(i);
529	>	assertEquals(1 + i, s.availablePermits());
530	>	try {
531	>	acquirer.acquire(s, i);
532	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
533		assertEquals(1, s.availablePermits());
562	–	} catch( InterruptedException e){
563	–	unexpectedException();
534		}
535		}
536
537		/**
538	<	* A release in one thread enables an acquire in another thread
538	>	* release in one thread enables acquire in another thread
539		*/
540	<	public void testAcquireReleaseInDifferentThreads_fair() {
541	<	final Semaphore s = new Semaphore(0, true);
542	<	Thread t = new Thread(new Runnable() {
543	<	public void run() {
544	<	try {
545	<	s.acquire();
546	<	s.acquire();
547	<	s.acquire();
548	<	s.acquire();
549	<	} catch(InterruptedException ie){
550	<	threadUnexpectedException();
551	<	}
552	<	}
553	<	});
554	<	try {
555	<	t.start();
556	<	Thread.sleep(SHORT_DELAY_MS);
557	<	s.release();
558	<	s.release();
559	<	s.release();
560	<	s.release();
561	<	s.release();
562	<	s.release();
563	<	t.join();
564	<	assertEquals(2, s.availablePermits());
565	<	} catch( InterruptedException e){
566	<	unexpectedException();
540	>	public void testReleaseAcquireDifferentThreads_acquire()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquire); }
541	>	public void testReleaseAcquireDifferentThreads_acquire_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquire); }
542	>	public void testReleaseAcquireDifferentThreads_acquireN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireN); }
543	>	public void testReleaseAcquireDifferentThreads_acquireN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireN); }
544	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
545	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
546	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
547	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
548	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimed); }
549	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimed); }
550	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimedN); }
551	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimedN); }
552	>	public void testReleaseAcquireDifferentThreads(boolean fair,
553	>	final AcquireMethod acquirer) {
554	>	final Semaphore s = new Semaphore(0, fair);
555	>	final int rounds = 4;
556	>	long startTime = System.nanoTime();
557	>	Thread t = newStartedThread(new CheckedRunnable() {
558	>	public void realRun() throws InterruptedException {
559	>	for (int i = 0; i < rounds; i++) {
560	>	assertFalse(s.hasQueuedThreads());
561	>	if (i % 2 == 0)
562	>	acquirer.acquire(s);
563	>	else
564	>	acquirer.acquire(s, 3);
565	>	}}});
566	>
567	>	for (int i = 0; i < rounds; i++) {
568	>	while (! (s.availablePermits() == 0 && s.hasQueuedThreads()))
569	>	Thread.yield();
570	>	assertTrue(t.isAlive());
571	>	if (i % 2 == 0)
572	>	s.release();
573	>	else
574	>	s.release(3);
575		}
576	+	awaitTermination(t);
577	+	assertEquals(0, s.availablePermits());
578	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
579		}
580
581		/**
582	<	* release(n) in one thread enables acquire(n) in another thread
582	>	* fair locks are strictly FIFO
583		*/
584	<	public void testAcquireReleaseNInDifferentThreads_fair() {
585	<	final Semaphore s = new Semaphore(0, true);
586	<	Thread t = new Thread(new Runnable() {
587	<	public void run() {
588	<	try {
589	<	s.acquire(2);
590	<	s.acquire(2);
591	<	s.release(4);
592	<	} catch(InterruptedException ie){
593	<	threadUnexpectedException();
594	<	}
595	<	}
596	<	});
597	<	try {
598	<	t.start();
599	<	Thread.sleep(SHORT_DELAY_MS);
600	<	s.release(6);
601	<	s.acquire(2);
602	<	s.acquire(2);
603	<	s.release(2);
604	<	t.join();
605	<	} catch( InterruptedException e){
606	<	unexpectedException();
607	<	}
584	>	public void testFairLocksFifo() {
585	>	final PublicSemaphore s = new PublicSemaphore(1, true);
586	>	final CountDownLatch pleaseRelease = new CountDownLatch(1);
587	>	Thread t1 = newStartedThread(new CheckedRunnable() {
588	>	public void realRun() throws InterruptedException {
589	>	// Will block; permits are available, but not three
590	>	s.acquire(3);
591	>	}});
592	>
593	>	waitForQueuedThreads(s);
594	>
595	>	Thread t2 = newStartedThread(new CheckedRunnable() {
596	>	public void realRun() throws InterruptedException {
597	>	// Will fail, even though 1 permit is available
598	>	assertFalse(s.tryAcquire(0L, MILLISECONDS));
599	>	assertFalse(s.tryAcquire(1, 0L, MILLISECONDS));
600	>
601	>	// untimed tryAcquire will barge and succeed
602	>	assertTrue(s.tryAcquire());
603	>	s.release(2);
604	>	assertTrue(s.tryAcquire(2));
605	>	s.release();
606	>
607	>	pleaseRelease.countDown();
608	>	// Will queue up behind t1, even though 1 permit is available
609	>	s.acquire();
610	>	}});
611	>
612	>	await(pleaseRelease);
613	>	waitForQueuedThread(s, t2);
614	>	s.release(2);
615	>	awaitTermination(t1);
616	>	assertTrue(t2.isAlive());
617	>	s.release();
618	>	awaitTermination(t2);
619		}
620
629	–
630	–
621		/**
622	<	* release in one thread enables timed acquire in another thread
623	<	*/
624	<	public void testTimedAcquireReleaseInDifferentThreads_fair() {
625	<	final Semaphore s = new Semaphore(1, true);
626	<	Thread t = new Thread(new Runnable() {
627	<	public void run() {
628	<	try {
629	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
630	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
631	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
632	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
633	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
634	<
645	<	} catch(InterruptedException ie){
646	<	threadUnexpectedException();
647	<	}
648	<	}
649	<	});
650	<	t.start();
651	<	try {
652	<	s.release();
653	<	s.release();
654	<	s.release();
655	<	s.release();
656	<	s.release();
657	<	t.join();
658	<	} catch( InterruptedException e){
659	<	unexpectedException();
660	<	}
661	<	}
662	<
663	<	/**
664	<	* release(n) in one thread enables timed acquire(n) in another thread
665	<	*/
666	<	public void testTimedAcquireReleaseNInDifferentThreads_fair() {
667	<	final Semaphore s = new Semaphore(2, true);
668	<	Thread t = new Thread(new Runnable() {
669	<	public void run() {
670	<	try {
671	<	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
672	<	s.release(2);
673	<	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
674	<	s.release(2);
675	<	} catch(InterruptedException ie){
676	<	threadUnexpectedException();
677	<	}
678	<	}
679	<	});
680	<	t.start();
681	<	try {
682	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
683	<	s.release(2);
684	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
685	<	s.release(2);
686	<	t.join();
687	<	} catch( InterruptedException e){
688	<	unexpectedException();
689	<	}
690	<	}
691	<
692	<	/**
693	<	* A waiting acquire blocks interruptibly
694	<	*/
695	<	public void testAcquire_InterruptedException_fair() {
696	<	final Semaphore s = new Semaphore(0, true);
697	<	Thread t = new Thread(new Runnable() {
698	<	public void run() {
699	<	try {
700	<	s.acquire();
701	<	threadShouldThrow();
702	<	} catch(InterruptedException success){}
703	<	}
704	<	});
705	<	t.start();
706	<	try {
707	<	Thread.sleep(SHORT_DELAY_MS);
708	<	t.interrupt();
709	<	t.join();
710	<	} catch(InterruptedException e){
711	<	unexpectedException();
712	<	}
713	<	}
714	<
715	<	/**
716	<	* A waiting acquire(n) blocks interruptibly
717	<	*/
718	<	public void testAcquireN_InterruptedException_fair() {
719	<	final Semaphore s = new Semaphore(2, true);
720	<	Thread t = new Thread(new Runnable() {
721	<	public void run() {
722	<	try {
723	<	s.acquire(3);
724	<	threadShouldThrow();
725	<	} catch(InterruptedException success){}
726	<	}
727	<	});
728	<	t.start();
729	<	try {
730	<	Thread.sleep(SHORT_DELAY_MS);
731	<	t.interrupt();
732	<	t.join();
733	<	} catch(InterruptedException e){
734	<	unexpectedException();
735	<	}
736	<	}
737	<
738	<	/**
739	<	*  A waiting tryAcquire blocks interruptibly
740	<	*/
741	<	public void testTryAcquire_InterruptedException_fair() {
742	<	final Semaphore s = new Semaphore(0, true);
743	<	Thread t = new Thread(new Runnable() {
744	<	public void run() {
745	<	try {
746	<	s.tryAcquire(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
747	<	threadShouldThrow();
748	<	} catch(InterruptedException success){
749	<	}
750	<	}
751	<	});
752	<	t.start();
753	<	try {
754	<	Thread.sleep(SHORT_DELAY_MS);
755	<	t.interrupt();
756	<	t.join();
757	<	} catch(InterruptedException e){
758	<	unexpectedException();
759	<	}
760	<	}
761	<
762	<	/**
763	<	*  A waiting tryAcquire(n) blocks interruptibly
764	<	*/
765	<	public void testTryAcquireN_InterruptedException_fair() {
766	<	final Semaphore s = new Semaphore(1, true);
767	<	Thread t = new Thread(new Runnable() {
768	<	public void run() {
769	<	try {
770	<	s.tryAcquire(4, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
771	<	threadShouldThrow();
772	<	} catch(InterruptedException success){
773	<	}
774	<	}
775	<	});
776	<	t.start();
777	<	try {
778	<	Thread.sleep(SHORT_DELAY_MS);
779	<	t.interrupt();
780	<	t.join();
781	<	} catch(InterruptedException e){
782	<	unexpectedException();
783	<	}
784	<	}
785	<
786	<	/**
787	<	* getQueueLength reports number of waiting threads
788	<	*/
789	<	public void testGetQueueLength_fair() {
790	<	final Semaphore lock = new Semaphore(1, true);
791	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
792	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
793	<	try {
794	<	assertEquals(0, lock.getQueueLength());
795	<	lock.acquireUninterruptibly();
796	<	t1.start();
797	<	Thread.sleep(SHORT_DELAY_MS);
798	<	assertEquals(1, lock.getQueueLength());
799	<	t2.start();
800	<	Thread.sleep(SHORT_DELAY_MS);
801	<	assertEquals(2, lock.getQueueLength());
802	<	t1.interrupt();
803	<	Thread.sleep(SHORT_DELAY_MS);
804	<	assertEquals(1, lock.getQueueLength());
805	<	lock.release();
806	<	Thread.sleep(SHORT_DELAY_MS);
807	<	assertEquals(0, lock.getQueueLength());
808	<	t1.join();
809	<	t2.join();
810	<	} catch(Exception e){
811	<	unexpectedException();
812	<	}
813	<	}
814	<
815	<
816	<	/**
817	<	* a deserialized serialized semaphore has same number of permits
818	<	*/
819	<	public void testSerialization_fair() {
820	<	Semaphore l = new Semaphore(3, true);
821	<
822	<	try {
823	<	l.acquire();
824	<	l.release();
825	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
826	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
827	<	out.writeObject(l);
828	<	out.close();
829	<
830	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
831	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
832	<	Semaphore r = (Semaphore) in.readObject();
833	<	assertEquals(3, r.availablePermits());
834	<	assertTrue(r.isFair());
835	<	r.acquire();
836	<	r.release();
837	<	} catch(Exception e){
838	<	unexpectedException();
839	<	}
622	>	* toString indicates current number of permits
623	>	*/
624	>	public void testToString()      { testToString(false); }
625	>	public void testToString_fair() { testToString(true); }
626	>	public void testToString(boolean fair) {
627	>	PublicSemaphore s = new PublicSemaphore(0, fair);
628	>	assertTrue(s.toString().contains("Permits = 0"));
629	>	s.release();
630	>	assertTrue(s.toString().contains("Permits = 1"));
631	>	s.release(2);
632	>	assertTrue(s.toString().contains("Permits = 3"));
633	>	s.reducePermits(5);
634	>	assertTrue(s.toString().contains("Permits = -2"));
635		}
636
842	–
637		}

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