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Comparing jsr166/src/test/tck/SemaphoreTest.java (file contents):
Revision 1.18 by jsr166, Mon Nov 16 05:58:01 2009 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
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); }
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	<	assertFalse(s1.isFair());
156	<	Semaphore s2 = new Semaphore(-1, false);
75	<	assertEquals(-1, s2.availablePermits());
76	<	assertFalse(s2.isFair());
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 testConstructor2() {
163	<	Semaphore s0 = new Semaphore(0);
164	<	assertEquals(0, s0.availablePermits());
165	<	assertFalse(s0.isFair());
166	<	Semaphore s1 = new Semaphore(-1);
167	<	assertEquals(-1, s1.availablePermits());
88	<	assertFalse(s1.isFair());
89	<	Semaphore s2 = new Semaphore(-1);
90	<	assertEquals(-1, s2.availablePermits());
91	<	assertFalse(s2.isFair());
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 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
108	<	*/
109	<	public void testAcquireReleaseInSameThread() {
110	<	Semaphore s = new Semaphore(1, false);
111	<	try {
112	<	s.acquire();
113	<	s.release();
114	<	s.acquire();
115	<	s.release();
116	<	s.acquire();
117	<	s.release();
118	<	s.acquire();
119	<	s.release();
120	<	s.acquire();
121	<	s.release();
122	<	assertEquals(1, s.availablePermits());
123	<	} catch (InterruptedException e) {
124	<	unexpectedException();
125	<	}
126	<	}
127	<
128	<	/**
129	<	* Uninterruptible acquire and release of semaphore succeed if
130	<	* initially available
131	<	*/
132	<	public void testAcquireUninterruptiblyReleaseInSameThread() {
133	<	Semaphore s = new Semaphore(1, false);
134	<	try {
135	<	s.acquireUninterruptibly();
136	<	s.release();
137	<	s.acquireUninterruptibly();
138	<	s.release();
139	<	s.acquireUninterruptibly();
140	<	s.release();
141	<	s.acquireUninterruptibly();
142	<	s.release();
143	<	s.acquireUninterruptibly();
144	<	s.release();
145	<	assertEquals(1, s.availablePermits());
146	<	} finally {
147	<	}
148	<	}
149	<
150	<	/**
151	<	* Timed Acquire and release of semaphore succeed if
152	<	* initially available
153	<	*/
154	<	public void testTimedAcquireReleaseInSameThread() {
155	<	Semaphore s = new Semaphore(1, false);
156	<	try {
157	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
158	<	s.release();
159	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
160	<	s.release();
161	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
162	<	s.release();
163	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
164	<	s.release();
165	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
166	<	s.release();
167	<	assertEquals(1, s.availablePermits());
168	<	} catch (InterruptedException e) {
169	<	unexpectedException();
170	<	}
171	<	}
172	<
173	<	/**
174	<	* A release in one thread enables an acquire in another thread
175	<	*/
176	<	public void testAcquireReleaseInDifferentThreads() {
177	<	final Semaphore s = new Semaphore(0, false);
178	<	Thread t = new Thread(new Runnable() {
179	<	public void run() {
180	<	try {
181	<	s.acquire();
182	<	s.release();
183	<	s.release();
184	<	s.acquire();
185	<	} catch (InterruptedException ie) {
186	<	threadUnexpectedException();
187	<	}
188	<	}
189	<	});
190	<	try {
191	<	t.start();
192	<	Thread.sleep(SHORT_DELAY_MS);
193	<	s.release();
194	<	s.release();
195	<	s.acquire();
196	<	s.acquire();
197	<	s.release();
198	<	t.join();
199	<	} catch (InterruptedException e) {
200	<	unexpectedException();
201	<	}
202	<	}
203	<
204	<	/**
205	<	* A release in one thread enables an uninterruptible acquire in another thread
187	>	* timed tryAcquire times out
188		*/
189	<	public void testUninterruptibleAcquireReleaseInDifferentThreads() {
190	<	final Semaphore s = new Semaphore(0, false);
191	<	Thread t = new Thread(new Runnable() {
192	<	public void run() {
193	<	s.acquireUninterruptibly();
194	<	s.release();
195	<	s.release();
196	<	s.acquireUninterruptibly();
197	<	}
198	<	});
199	<	try {
200	<	t.start();
201	<	Thread.sleep(SHORT_DELAY_MS);
202	<	s.release();
203	<	s.release();
204	<	s.acquireUninterruptibly();
205	<	s.acquireUninterruptibly();
206	<	s.release();
207	<	t.join();
208	<	} catch (InterruptedException e) {
209	<	unexpectedException();
210	<	}
211	<	}
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
232	–	/**
233	–	*  A release in one thread enables a timed acquire in another thread
234	–	*/
235	–	public void testTimedAcquireReleaseInDifferentThreads() {
236	–	final Semaphore s = new Semaphore(1, false);
237	–	Thread t = new Thread(new Runnable() {
238	–	public void run() {
239	–	try {
240	–	s.release();
241	–	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
242	–	s.release();
243	–	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
244	–
245	–	} catch (InterruptedException ie) {
246	–	threadUnexpectedException();
247	–	}
248	–	}
249	–	});
297		try {
298	<	t.start();
299	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
300	<	s.release();
301	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
302	<	s.release();
303	<	s.release();
257	<	t.join();
258	<	} catch (InterruptedException e) {
259	<	unexpectedException();
260	<	}
261	<	}
262	<
263	<	/**
264	<	* A waiting acquire blocks interruptibly
265	<	*/
266	<	public void testAcquire_InterruptedException() {
267	<	final Semaphore s = new Semaphore(0, false);
268	<	Thread t = new Thread(new Runnable() {
269	<	public void run() {
270	<	try {
271	<	s.acquire();
272	<	threadShouldThrow();
273	<	} catch (InterruptedException success) {}
274	<	}
275	<	});
276	<	t.start();
277	<	try {
278	<	Thread.sleep(SHORT_DELAY_MS);
279	<	t.interrupt();
280	<	t.join();
281	<	} catch (InterruptedException e) {
282	<	unexpectedException();
283	<	}
284	<	}
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	<	/**
287	<	*  A waiting timed acquire blocks interruptibly
288	<	*/
289	<	public void testTryAcquire_InterruptedException() {
290	<	final Semaphore s = new Semaphore(0, false);
291	<	Thread t = new Thread(new Runnable() {
292	<	public void run() {
293	<	try {
294	<	s.tryAcquire(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
295	<	threadShouldThrow();
296	<	} catch (InterruptedException success) {
297	<	}
298	<	}
299	<	});
300	<	t.start();
301	<	try {
302	<	Thread.sleep(SHORT_DELAY_MS);
303	<	t.interrupt();
304	<	t.join();
305	<	} catch (InterruptedException e) {
306	<	unexpectedException();
307	<	}
305	>	awaitTermination(t);
306		}
307
308		/**
309		* hasQueuedThreads reports whether there are waiting threads
310		*/
311	<	public void testHasQueuedThreads() {
312	<	final Semaphore lock = new Semaphore(1, false);
313	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
314	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
315	<	try {
316	<	assertFalse(lock.hasQueuedThreads());
317	<	lock.acquireUninterruptibly();
318	<	t1.start();
319	<	Thread.sleep(SHORT_DELAY_MS);
320	<	assertTrue(lock.hasQueuedThreads());
321	<	t2.start();
322	<	Thread.sleep(SHORT_DELAY_MS);
323	<	assertTrue(lock.hasQueuedThreads());
324	<	t1.interrupt();
325	<	Thread.sleep(SHORT_DELAY_MS);
326	<	assertTrue(lock.hasQueuedThreads());
327	<	lock.release();
328	<	Thread.sleep(SHORT_DELAY_MS);
331	<	assertFalse(lock.hasQueuedThreads());
332	<	t1.join();
333	<	t2.join();
334	<	} catch (Exception e) {
335	<	unexpectedException();
336	<	}
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		* getQueueLength reports number of waiting threads
333		*/
334	<	public void testGetQueueLength() {
335	<	final Semaphore lock = new Semaphore(1, false);
336	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
337	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
338	<	try {
339	<	assertEquals(0, lock.getQueueLength());
340	<	lock.acquireUninterruptibly();
341	<	t1.start();
342	<	Thread.sleep(SHORT_DELAY_MS);
343	<	assertEquals(1, lock.getQueueLength());
344	<	t2.start();
345	<	Thread.sleep(SHORT_DELAY_MS);
346	<	assertEquals(2, lock.getQueueLength());
347	<	t1.interrupt();
348	<	Thread.sleep(SHORT_DELAY_MS);
349	<	assertEquals(1, lock.getQueueLength());
350	<	lock.release();
351	<	Thread.sleep(SHORT_DELAY_MS);
360	<	assertEquals(0, lock.getQueueLength());
361	<	t1.join();
362	<	t2.join();
363	<	} catch (Exception e) {
364	<	unexpectedException();
365	<	}
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		* getQueuedThreads includes waiting threads
356		*/
357	<	public void testGetQueuedThreads() {
358	<	final PublicSemaphore lock = new PublicSemaphore(1, false);
359	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
360	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
361	<	try {
362	<	assertTrue(lock.getQueuedThreads().isEmpty());
363	<	lock.acquireUninterruptibly();
364	<	assertTrue(lock.getQueuedThreads().isEmpty());
365	<	t1.start();
366	<	Thread.sleep(SHORT_DELAY_MS);
367	<	assertTrue(lock.getQueuedThreads().contains(t1));
368	<	t2.start();
369	<	Thread.sleep(SHORT_DELAY_MS);
370	<	assertTrue(lock.getQueuedThreads().contains(t1));
371	<	assertTrue(lock.getQueuedThreads().contains(t2));
372	<	t1.interrupt();
373	<	Thread.sleep(SHORT_DELAY_MS);
374	<	assertFalse(lock.getQueuedThreads().contains(t1));
375	<	assertTrue(lock.getQueuedThreads().contains(t2));
376	<	lock.release();
377	<	Thread.sleep(SHORT_DELAY_MS);
392	<	assertTrue(lock.getQueuedThreads().isEmpty());
393	<	t1.join();
394	<	t2.join();
395	<	} catch (Exception e) {
396	<	unexpectedException();
397	<	}
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		* drainPermits reports and removes given number of permits
382		*/
383	<	public void testDrainPermits() {
384	<	Semaphore s = new Semaphore(0, false);
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);
#	Line 412 | Line 394 | public class SemaphoreTest extends JSR16
394		}
395
396		/**
397	<	* reducePermits reduces number of permits
397	>	* release(-N) throws IllegalArgumentException
398		*/
399	<	public void testReducePermits() {
400	<	PublicSemaphore s = new PublicSemaphore(10, false);
401	<	assertEquals(10, s.availablePermits());
402	<	s.reducePermits(1);
421	<	assertEquals(9, s.availablePermits());
422	<	s.reducePermits(10);
423	<	assertEquals(-1, s.availablePermits());
424	<	}
425	<
426	<	/**
427	<	* a deserialized serialized semaphore has same number of permits
428	<	*/
429	<	public void testSerialization() {
430	<	Semaphore l = new Semaphore(3, false);
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	<	l.acquire();
405	<	l.release();
406	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
435	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
436	<	out.writeObject(l);
437	<	out.close();
438	<
439	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
440	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
441	<	Semaphore r = (Semaphore) in.readObject();
442	<	assertEquals(3, r.availablePermits());
443	<	assertFalse(r.isFair());
444	<	r.acquire();
445	<	r.release();
446	<	} catch (Exception e) {
447	<	unexpectedException();
448	<	}
404	>	s.release(-1);
405	>	shouldThrow();
406	>	} catch (IllegalArgumentException success) {}
407		}
408
451	–
409		/**
410	<	* Zero, negative, and positive initial values are allowed in constructor
410	>	* reducePermits(-N) throws IllegalArgumentException
411		*/
412	<	public void testConstructor_fair() {
413	<	Semaphore s0 = new Semaphore(0, true);
414	<	assertEquals(0, s0.availablePermits());
415	<	assertTrue(s0.isFair());
416	<	Semaphore s1 = new Semaphore(-1, true);
417	<	assertEquals(-1, s1.availablePermits());
418	<	Semaphore s2 = new Semaphore(-1, true);
419	<	assertEquals(-1, s2.availablePermits());
463	<	}
464	<
465	<	/**
466	<	* tryAcquire succeeds when sufficient permits, else fails
467	<	*/
468	<	public void testTryAcquireInSameThread_fair() {
469	<	Semaphore s = new Semaphore(2, true);
470	<	assertEquals(2, s.availablePermits());
471	<	assertTrue(s.tryAcquire());
472	<	assertTrue(s.tryAcquire());
473	<	assertEquals(0, s.availablePermits());
474	<	assertFalse(s.tryAcquire());
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	>	s.reducePermits(-1);
418	>	shouldThrow();
419	>	} catch (IllegalArgumentException success) {}
420		}
421
422		/**
423	<	* tryAcquire(n) succeeds when sufficient permits, else fails
423	>	* reducePermits reduces number of permits
424		*/
425	<	public void testTryAcquireNInSameThread_fair() {
426	<	Semaphore s = new Semaphore(2, true);
427	<	assertEquals(2, s.availablePermits());
428	<	assertTrue(s.tryAcquire(2));
429	<	assertEquals(0, s.availablePermits());
430	<	assertFalse(s.tryAcquire());
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	<	* Acquire and release of semaphore succeed if initially available
443	>	* a reserialized semaphore has same number of permits and
444	>	* fairness, but no queued threads
445		*/
446	<	public void testAcquireReleaseInSameThread_fair() {
447	<	Semaphore s = new Semaphore(1, true);
446	>	public void testSerialization()      { testSerialization(false); }
447	>	public void testSerialization_fair() { testSerialization(true); }
448	>	public void testSerialization(boolean fair) {
449		try {
450	+	Semaphore s = new Semaphore(3, fair);
451		s.acquire();
495	–	s.release();
496	–	s.acquire();
497	–	s.release();
498	–	s.acquire();
499	–	s.release();
500	–	s.acquire();
501	–	s.release();
452		s.acquire();
453		s.release();
504	–	assertEquals(1, s.availablePermits());
505	–	} catch (InterruptedException e) {
506	–	unexpectedException();
507	–	}
508	–	}
454
455	<	/**
456	<	* Acquire(n) and release(n) of semaphore succeed if initially available
457	<	*/
458	<	public void testAcquireReleaseNInSameThread_fair() {
459	<	Semaphore s = new Semaphore(1, true);
460	<	try {
461	<	s.release(1);
462	<	s.acquire(1);
463	<	s.release(2);
464	<	s.acquire(2);
520	<	s.release(3);
521	<	s.acquire(3);
522	<	s.release(4);
523	<	s.acquire(4);
524	<	s.release(5);
525	<	s.acquire(5);
526	<	assertEquals(1, s.availablePermits());
527	<	} catch (InterruptedException e) {
528	<	unexpectedException();
529	<	}
530	<	}
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	<	* Acquire(n) and release(n) of semaphore succeed if initially available
468	<	*/
469	<	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
470	<	Semaphore s = new Semaphore(1, true);
471	<	try {
472	<	s.release(1);
473	<	s.acquireUninterruptibly(1);
474	<	s.release(2);
475	<	s.acquireUninterruptibly(2);
476	<	s.release(3);
477	<	s.acquireUninterruptibly(3);
478	<	s.release(4);
479	<	s.acquireUninterruptibly(4);
480	<	s.release(5);
547	<	s.acquireUninterruptibly(5);
548	<	assertEquals(1, s.availablePermits());
549	<	} finally {
550	<	}
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	<	* release(n) in one thread enables timed acquire(n) in another thread
484	>	* tryAcquire(n) succeeds when sufficient permits, else fails
485		*/
486	<	public void testTimedAcquireReleaseNInSameThread_fair() {
487	<	Semaphore s = new Semaphore(1, true);
488	<	try {
489	<	s.release(1);
490	<	assertTrue(s.tryAcquire(1, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
491	<	s.release(2);
492	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
493	<	s.release(3);
494	<	assertTrue(s.tryAcquire(3, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
495	<	s.release(4);
496	<	assertTrue(s.tryAcquire(4, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
497	<	s.release(5);
568	<	assertTrue(s.tryAcquire(5, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
569	<	assertEquals(1, s.availablePermits());
570	<	} catch (InterruptedException e) {
571	<	unexpectedException();
572	<	}
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	>	assertFalse(s.tryAcquire(3));
492	>	assertEquals(2, s.availablePermits());
493	>	assertTrue(s.tryAcquire(2));
494	>	assertEquals(0, s.availablePermits());
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());
592	–	} catch (InterruptedException e) {
593	–	unexpectedException();
529		}
530		}
531
532		/**
533	<	* A release in one thread enables an acquire in another thread
533	>	* release in one thread enables acquire in another thread
534		*/
535	<	public void testAcquireReleaseInDifferentThreads_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();
541	<	s.acquire();
542	<	s.acquire();
543	<	s.acquire();
544	<	} catch (InterruptedException ie) {
545	<	threadUnexpectedException();
546	<	}
547	<	}
548	<	});
549	<	try {
550	<	t.start();
551	<	Thread.sleep(SHORT_DELAY_MS);
552	<	s.release();
553	<	s.release();
554	<	s.release();
555	<	s.release();
556	<	s.release();
557	<	s.release();
558	<	t.join();
559	<	assertEquals(2, s.availablePermits());
560	<	} catch (InterruptedException e) {
561	<	unexpectedException();
562	<	}
563	<	}
564	<
565	<	/**
566	<	* release(n) in one thread enables acquire(n) in another thread
567	<	*/
568	<	public void testAcquireReleaseNInDifferentThreads_fair() {
569	<	final Semaphore s = new Semaphore(0, true);
635	<	Thread t = new Thread(new Runnable() {
636	<	public void run() {
637	<	try {
638	<	s.acquire();
639	<	s.release(2);
640	<	s.acquire();
641	<	} catch (InterruptedException ie) {
642	<	threadUnexpectedException();
643	<	}
644	<	}
645	<	});
646	<	try {
647	<	t.start();
648	<	Thread.sleep(SHORT_DELAY_MS);
649	<	s.release(2);
650	<	s.acquire(2);
651	<	s.release(1);
652	<	t.join();
653	<	} catch (InterruptedException e) {
654	<	unexpectedException();
655	<	}
656	<	}
657	<
658	<	/**
659	<	* release(n) in one thread enables acquire(n) in another thread
660	<	*/
661	<	public void testAcquireReleaseNInDifferentThreads_fair2() {
662	<	final Semaphore s = new Semaphore(0, true);
663	<	Thread t = new Thread(new Runnable() {
664	<	public void run() {
665	<	try {
666	<	s.acquire(2);
667	<	s.acquire(2);
668	<	s.release(4);
669	<	} catch (InterruptedException ie) {
670	<	threadUnexpectedException();
671	<	}
672	<	}
673	<	});
674	<	try {
675	<	t.start();
676	<	Thread.sleep(SHORT_DELAY_MS);
677	<	s.release(6);
678	<	s.acquire(2);
679	<	s.acquire(2);
680	<	s.release(2);
681	<	t.join();
682	<	} catch (InterruptedException e) {
683	<	unexpectedException();
684	<	}
685	<	}
686	<
687	<
688	<
689	<
690	<
691	<	/**
692	<	* release in one thread enables timed acquire in another thread
693	<	*/
694	<	public void testTimedAcquireReleaseInDifferentThreads_fair() {
695	<	final Semaphore s = new Semaphore(1, true);
696	<	Thread t = new Thread(new Runnable() {
697	<	public void run() {
698	<	try {
699	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
700	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
701	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
702	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
703	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
704	<
705	<	} catch (InterruptedException ie) {
706	<	threadUnexpectedException();
707	<	}
708	<	}
709	<	});
710	<	t.start();
711	<	try {
712	<	s.release();
713	<	s.release();
714	<	s.release();
715	<	s.release();
716	<	s.release();
717	<	t.join();
718	<	} catch (InterruptedException e) {
719	<	unexpectedException();
720	<	}
721	<	}
722	<
723	<	/**
724	<	* release(n) in one thread enables timed acquire(n) in another thread
725	<	*/
726	<	public void testTimedAcquireReleaseNInDifferentThreads_fair() {
727	<	final Semaphore s = new Semaphore(2, true);
728	<	Thread t = new Thread(new Runnable() {
729	<	public void run() {
730	<	try {
731	<	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
732	<	s.release(2);
733	<	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
734	<	s.release(2);
735	<	} catch (InterruptedException ie) {
736	<	threadUnexpectedException();
737	<	}
738	<	}
739	<	});
740	<	t.start();
741	<	try {
742	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
743	<	s.release(2);
744	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
745	<	s.release(2);
746	<	t.join();
747	<	} catch (InterruptedException e) {
748	<	unexpectedException();
749	<	}
750	<	}
751	<
752	<	/**
753	<	* A waiting acquire blocks interruptibly
754	<	*/
755	<	public void testAcquire_InterruptedException_fair() {
756	<	final Semaphore s = new Semaphore(0, true);
757	<	Thread t = new Thread(new Runnable() {
758	<	public void run() {
759	<	try {
760	<	s.acquire();
761	<	threadShouldThrow();
762	<	} catch (InterruptedException success) {}
763	<	}
764	<	});
765	<	t.start();
766	<	try {
767	<	Thread.sleep(SHORT_DELAY_MS);
768	<	t.interrupt();
769	<	t.join();
770	<	} catch (InterruptedException e) {
771	<	unexpectedException();
772	<	}
773	<	}
774	<
775	<	/**
776	<	* A waiting acquire(n) blocks interruptibly
777	<	*/
778	<	public void testAcquireN_InterruptedException_fair() {
779	<	final Semaphore s = new Semaphore(2, true);
780	<	Thread t = new Thread(new Runnable() {
781	<	public void run() {
782	<	try {
783	<	s.acquire(3);
784	<	threadShouldThrow();
785	<	} catch (InterruptedException success) {}
786	<	}
787	<	});
788	<	t.start();
789	<	try {
790	<	Thread.sleep(SHORT_DELAY_MS);
791	<	t.interrupt();
792	<	t.join();
793	<	} catch (InterruptedException e) {
794	<	unexpectedException();
795	<	}
796	<	}
797	<
798	<	/**
799	<	*  A waiting tryAcquire blocks interruptibly
800	<	*/
801	<	public void testTryAcquire_InterruptedException_fair() {
802	<	final Semaphore s = new Semaphore(0, true);
803	<	Thread t = new Thread(new Runnable() {
804	<	public void run() {
805	<	try {
806	<	s.tryAcquire(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
807	<	threadShouldThrow();
808	<	} catch (InterruptedException success) {
809	<	}
810	<	}
811	<	});
812	<	t.start();
813	<	try {
814	<	Thread.sleep(SHORT_DELAY_MS);
815	<	t.interrupt();
816	<	t.join();
817	<	} catch (InterruptedException e) {
818	<	unexpectedException();
819	<	}
820	<	}
821	<
822	<	/**
823	<	*  A waiting tryAcquire(n) blocks interruptibly
824	<	*/
825	<	public void testTryAcquireN_InterruptedException_fair() {
826	<	final Semaphore s = new Semaphore(1, true);
827	<	Thread t = new Thread(new Runnable() {
828	<	public void run() {
829	<	try {
830	<	s.tryAcquire(4, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
831	<	threadShouldThrow();
832	<	} catch (InterruptedException success) {
833	<	}
834	<	}
835	<	});
836	<	t.start();
837	<	try {
838	<	Thread.sleep(SHORT_DELAY_MS);
839	<	t.interrupt();
840	<	t.join();
841	<	} catch (InterruptedException e) {
842	<	unexpectedException();
843	<	}
844	<	}
845	<
846	<	/**
847	<	* getQueueLength reports number of waiting threads
848	<	*/
849	<	public void testGetQueueLength_fair() {
850	<	final Semaphore lock = new Semaphore(1, true);
851	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
852	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
853	<	try {
854	<	assertEquals(0, lock.getQueueLength());
855	<	lock.acquireUninterruptibly();
856	<	t1.start();
857	<	Thread.sleep(SHORT_DELAY_MS);
858	<	assertEquals(1, lock.getQueueLength());
859	<	t2.start();
860	<	Thread.sleep(SHORT_DELAY_MS);
861	<	assertEquals(2, lock.getQueueLength());
862	<	t1.interrupt();
863	<	Thread.sleep(SHORT_DELAY_MS);
864	<	assertEquals(1, lock.getQueueLength());
865	<	lock.release();
866	<	Thread.sleep(SHORT_DELAY_MS);
867	<	assertEquals(0, lock.getQueueLength());
868	<	t1.join();
869	<	t2.join();
870	<	} catch (Exception e) {
871	<	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
875	–
576		/**
577	<	* 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	<	}
600	<	}
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() {
620	<	Semaphore s = new Semaphore(0);
621	<	String us = s.toString();
622	<	assertTrue(us.indexOf("Permits = 0") >= 0);
623	<	s.release();
910	<	String s1 = s.toString();
911	<	assertTrue(s1.indexOf("Permits = 1") >= 0);
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	<	String s2 = s.toString();
626	<	assertTrue(s2.indexOf("Permits = 2") >= 0);
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
632		}

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