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

Comparing jsr166/src/test/tck/SemaphoreTest.java (file contents):
Revision 1.20 by jsr166, Sat Nov 21 02:07:27 2009 UTC vs.
Revision 1.30 by jsr166, Fri Jun 3 05:07:14 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.*;
11	>	import java.util.concurrent.CountDownLatch;
12	>	import java.util.concurrent.Semaphore;
13		import static java.util.concurrent.TimeUnit.MILLISECONDS;
13	–	import java.io.*;
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);
#	Line 24 | Line 24 | public class SemaphoreTest extends JSR16
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
#	Line 38 | Line 42 | public class SemaphoreTest extends JSR16
42		*/
43		class InterruptibleLockRunnable extends CheckedRunnable {
44		final Semaphore lock;
45	<	InterruptibleLockRunnable(Semaphore l) { lock = l; }
45	>	InterruptibleLockRunnable(Semaphore s) { lock = s; }
46		public void realRun() {
47		try {
48		lock.acquire();
#	Line 47 | Line 51 | public class SemaphoreTest extends JSR16
51		}
52		}
53
50	–
54		/**
55	<	* A runnable calling acquire that expects to be
53	<	* interrupted
55	>	* A runnable calling acquire that expects to be interrupted
56		*/
57		class InterruptedLockRunnable extends CheckedInterruptedRunnable {
58		final Semaphore lock;
59	<	InterruptedLockRunnable(Semaphore l) { lock = l; }
59	>	InterruptedLockRunnable(Semaphore s) { lock = s; }
60		public void realRun() throws InterruptedException {
61		lock.acquire();
62		}
63		}
64
65		/**
66	<	* Zero, negative, and positive initial values are allowed in constructor
66	>	* Spin-waits until s.hasQueuedThread(t) becomes true.
67		*/
68	<	public void testConstructor() {
69	<	for (int permits : new int[] { -1, 0, 1 }) {
70	<	for (boolean fair : new boolean[] { false, true }) {
71	<	Semaphore s = new Semaphore(permits, fair);
72	<	assertEquals(permits, s.availablePermits());
73	<	assertEquals(fair, s.isFair());
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()      { 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	<	for (int permits : new int[] { -1, 0, 1 }) {
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());
#	Line 87 | Line 170 | public class SemaphoreTest extends JSR16
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
101	<	*/
102	<	public void testAcquireReleaseInSameThread()
103	<	throws InterruptedException {
104	<	Semaphore s = new Semaphore(1, false);
105	<	s.acquire();
106	<	s.release();
107	<	s.acquire();
108	<	s.release();
109	<	s.acquire();
110	<	s.release();
111	<	s.acquire();
112	<	s.release();
113	<	s.acquire();
114	<	s.release();
115	<	assertEquals(1, s.availablePermits());
116	<	}
117	<
118	<	/**
119	<	* Uninterruptible acquire and release of semaphore succeed if
120	<	* initially available
121	<	*/
122	<	public void testAcquireUninterruptiblyReleaseInSameThread()
123	<	throws InterruptedException {
124	<	Semaphore s = new Semaphore(1, false);
125	<	s.acquireUninterruptibly();
126	<	s.release();
127	<	s.acquireUninterruptibly();
128	<	s.release();
129	<	s.acquireUninterruptibly();
130	<	s.release();
131	<	s.acquireUninterruptibly();
132	<	s.release();
133	<	s.acquireUninterruptibly();
134	<	s.release();
135	<	assertEquals(1, s.availablePermits());
136	<	}
137	<
138	<	/**
139	<	* Timed Acquire and release of semaphore succeed if
140	<	* initially available
141	<	*/
142	<	public void testTimedAcquireReleaseInSameThread()
143	<	throws InterruptedException {
144	<	Semaphore s = new Semaphore(1, false);
145	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
146	<	s.release();
147	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
148	<	s.release();
149	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
150	<	s.release();
151	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
152	<	s.release();
153	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
154	<	s.release();
155	<	assertEquals(1, s.availablePermits());
156	<	}
157	<
158	<	/**
159	<	* A release in one thread enables an acquire in another thread
187	>	* timed tryAcquire times out
188		*/
189	<	public void testAcquireReleaseInDifferentThreads()
190	<	throws InterruptedException {
191	<	final Semaphore s = new Semaphore(0, false);
192	<	Thread t = new Thread(new CheckedRunnable() {
193	<	public void realRun() throws InterruptedException {
194	<	s.acquire();
195	<	s.release();
196	<	s.release();
197	<	s.acquire();
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 pleaseInterrupt = 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	>	pleaseInterrupt.release();
250	>
251	>	// Interrupt during acquire(N)
252	>	try {
253	>	acquirer.acquire(s, 3);
254	>	shouldThrow();
255	>	} catch (InterruptedException success) {}
256		}});
257
258	<	t.start();
259	<	Thread.sleep(SHORT_DELAY_MS);
260	<	s.release();
261	<	s.release();
262	<	s.acquire();
263	<	s.acquire();
178	<	s.release();
179	<	t.join();
258	>	waitForQueuedThread(s, t);
259	>	t.interrupt();
260	>	await(pleaseInterrupt);
261	>	waitForQueuedThread(s, t);
262	>	t.interrupt();
263	>	awaitTermination(t);
264		}
265
266		/**
267	<	* A release in one thread enables an uninterruptible acquire in another thread
267	>	* acquireUninterruptibly(), acquireUninterruptibly(N) are
268	>	* uninterruptible
269		*/
270	<	public void testUninterruptibleAcquireReleaseInDifferentThreads()
271	<	throws InterruptedException {
272	<	final Semaphore s = new Semaphore(0, false);
273	<	Thread t = new Thread(new CheckedRunnable() {
274	<	public void realRun() throws InterruptedException {
275	<	s.acquireUninterruptibly();
276	<	s.release();
192	<	s.release();
193	<	s.acquireUninterruptibly();
194	<	}});
270	>	public void testUninterruptible_acquireUninterruptibly()       { testUninterruptible(false, AcquireMethod.acquireUninterruptibly); }
271	>	public void testUninterruptible_acquireUninterruptibly_fair()  { testUninterruptible(true,  AcquireMethod.acquireUninterruptibly); }
272	>	public void testUninterruptible_acquireUninterruptiblyN()      { testUninterruptible(false, AcquireMethod.acquireUninterruptiblyN); }
273	>	public void testUninterruptible_acquireUninterruptiblyN_fair() { testUninterruptible(true,  AcquireMethod.acquireUninterruptiblyN); }
274	>	public void testUninterruptible(boolean fair, final AcquireMethod acquirer) {
275	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
276	>	final Semaphore pleaseInterrupt = new Semaphore(-1, fair);
277
278	<	t.start();
197	<	Thread.sleep(SHORT_DELAY_MS);
198	<	s.release();
199	<	s.release();
200	<	s.acquireUninterruptibly();
201	<	s.acquireUninterruptibly();
202	<	s.release();
203	<	t.join();
204	<	}
205	<
206	<
207	<	/**
208	<	*  A release in one thread enables a timed acquire in another thread
209	<	*/
210	<	public void testTimedAcquireReleaseInDifferentThreads()
211	<	throws InterruptedException {
212	<	final Semaphore s = new Semaphore(1, false);
213	<	Thread t = new Thread(new CheckedRunnable() {
278	>	Thread t1 = newStartedThread(new CheckedRunnable() {
279		public void realRun() throws InterruptedException {
280	<	s.release();
281	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
282	<	s.release();
283	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
280	>	// Interrupt before acquire
281	>	pleaseInterrupt.release();
282	>	Thread.currentThread().interrupt();
283	>	acquirer.acquire(s);
284	>	assertTrue(Thread.interrupted());
285		}});
286
287	<	t.start();
222	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
223	<	s.release();
224	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
225	<	s.release();
226	<	s.release();
227	<	t.join();
228	<	}
229	<
230	<	/**
231	<	* A waiting acquire blocks interruptibly
232	<	*/
233	<	public void testAcquire_InterruptedException()
234	<	throws InterruptedException {
235	<	final Semaphore s = new Semaphore(0, false);
236	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
287	>	Thread t2 = newStartedThread(new CheckedRunnable() {
288		public void realRun() throws InterruptedException {
289	<	s.acquire();
289	>	// Interrupt during acquire
290	>	pleaseInterrupt.release();
291	>	acquirer.acquire(s);
292	>	assertTrue(Thread.interrupted());
293		}});
294
295	<	t.start();
296	<	Thread.sleep(SHORT_DELAY_MS);
297	<	t.interrupt();
298	<	t.join();
245	<	}
295	>	await(pleaseInterrupt);
296	>	waitForQueuedThread(s, t1);
297	>	waitForQueuedThread(s, t2);
298	>	t2.interrupt();
299
300	<	/**
301	<	*  A waiting timed acquire blocks interruptibly
249	<	*/
250	<	public void testTryAcquire_InterruptedException()
251	<	throws InterruptedException {
252	<	final Semaphore s = new Semaphore(0, false);
253	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
254	<	public void realRun() throws InterruptedException {
255	<	s.tryAcquire(MEDIUM_DELAY_MS, MILLISECONDS);
256	<	}});
300	>	assertThreadStaysAlive(t1);
301	>	assertTrue(t2.isAlive());
302
303	<	t.start();
304	<	Thread.sleep(SHORT_DELAY_MS);
305	<	t.interrupt();
306	<	t.join();
303	>	s.release(2);
304	>
305	>	awaitTermination(t1);
306	>	awaitTermination(t2);
307		}
308
309		/**
310		* hasQueuedThreads reports whether there are waiting threads
311		*/
312	<	public void testHasQueuedThreads() throws InterruptedException {
313	<	final Semaphore lock = new Semaphore(1, false);
314	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
315	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
312	>	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
313	>	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
314	>	public void testHasQueuedThreads(boolean fair) {
315	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
316		assertFalse(lock.hasQueuedThreads());
317		lock.acquireUninterruptibly();
318	<	t1.start();
319	<	Thread.sleep(SHORT_DELAY_MS);
318	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
319	>	waitForQueuedThread(lock, t1);
320		assertTrue(lock.hasQueuedThreads());
321	<	t2.start();
322	<	Thread.sleep(SHORT_DELAY_MS);
321	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
322	>	waitForQueuedThread(lock, t2);
323		assertTrue(lock.hasQueuedThreads());
324		t1.interrupt();
325	<	Thread.sleep(SHORT_DELAY_MS);
325	>	awaitTermination(t1);
326		assertTrue(lock.hasQueuedThreads());
327		lock.release();
328	<	Thread.sleep(SHORT_DELAY_MS);
328	>	awaitTermination(t2);
329		assertFalse(lock.hasQueuedThreads());
285	–	t1.join();
286	–	t2.join();
330		}
331
332		/**
333		* getQueueLength reports number of waiting threads
334		*/
335	<	public void testGetQueueLength() throws InterruptedException {
336	<	final Semaphore lock = new Semaphore(1, false);
337	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
338	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
335	>	public void testGetQueueLength()      { testGetQueueLength(false); }
336	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
337	>	public void testGetQueueLength(boolean fair) {
338	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
339		assertEquals(0, lock.getQueueLength());
340		lock.acquireUninterruptibly();
341	<	t1.start();
342	<	Thread.sleep(SHORT_DELAY_MS);
341	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
342	>	waitForQueuedThread(lock, t1);
343		assertEquals(1, lock.getQueueLength());
344	<	t2.start();
345	<	Thread.sleep(SHORT_DELAY_MS);
344	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
345	>	waitForQueuedThread(lock, t2);
346		assertEquals(2, lock.getQueueLength());
347		t1.interrupt();
348	<	Thread.sleep(SHORT_DELAY_MS);
348	>	awaitTermination(t1);
349		assertEquals(1, lock.getQueueLength());
350		lock.release();
351	<	Thread.sleep(SHORT_DELAY_MS);
351	>	awaitTermination(t2);
352		assertEquals(0, lock.getQueueLength());
310	–	t1.join();
311	–	t2.join();
353		}
354
355		/**
356		* getQueuedThreads includes waiting threads
357		*/
358	<	public void testGetQueuedThreads() throws InterruptedException {
359	<	final PublicSemaphore lock = new PublicSemaphore(1, false);
360	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
361	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
358	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
359	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
360	>	public void testGetQueuedThreads(boolean fair) {
361	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
362		assertTrue(lock.getQueuedThreads().isEmpty());
363		lock.acquireUninterruptibly();
364		assertTrue(lock.getQueuedThreads().isEmpty());
365	<	t1.start();
366	<	Thread.sleep(SHORT_DELAY_MS);
365	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
366	>	waitForQueuedThread(lock, t1);
367		assertTrue(lock.getQueuedThreads().contains(t1));
368	<	t2.start();
369	<	Thread.sleep(SHORT_DELAY_MS);
368	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
369	>	waitForQueuedThread(lock, t2);
370		assertTrue(lock.getQueuedThreads().contains(t1));
371		assertTrue(lock.getQueuedThreads().contains(t2));
372		t1.interrupt();
373	<	Thread.sleep(SHORT_DELAY_MS);
373	>	awaitTermination(t1);
374		assertFalse(lock.getQueuedThreads().contains(t1));
375		assertTrue(lock.getQueuedThreads().contains(t2));
376		lock.release();
377	<	Thread.sleep(SHORT_DELAY_MS);
377	>	awaitTermination(t2);
378		assertTrue(lock.getQueuedThreads().isEmpty());
338	–	t1.join();
339	–	t2.join();
379		}
380
381		/**
382		* drainPermits reports and removes given number of permits
383		*/
384	<	public void testDrainPermits() {
385	<	Semaphore s = new Semaphore(0, false);
384	>	public void testDrainPermits()      { testDrainPermits(false); }
385	>	public void testDrainPermits_fair() { testDrainPermits(true); }
386	>	public void testDrainPermits(boolean fair) {
387	>	Semaphore s = new Semaphore(0, fair);
388		assertEquals(0, s.availablePermits());
389		assertEquals(0, s.drainPermits());
390		s.release(10);
#	Line 354 | Line 395 | public class SemaphoreTest extends JSR16
395		}
396
397		/**
398	<	* reducePermits reduces number of permits
398	>	* release(-N) throws IllegalArgumentException
399		*/
400	<	public void testReducePermits() {
401	<	PublicSemaphore s = new PublicSemaphore(10, false);
402	<	assertEquals(10, s.availablePermits());
403	<	s.reducePermits(1);
404	<	assertEquals(9, s.availablePermits());
405	<	s.reducePermits(10);
406	<	assertEquals(-1, s.availablePermits());
400	>	public void testReleaseIAE()      { testReleaseIAE(false); }
401	>	public void testReleaseIAE_fair() { testReleaseIAE(true); }
402	>	public void testReleaseIAE(boolean fair) {
403	>	Semaphore s = new Semaphore(10, fair);
404	>	try {
405	>	s.release(-1);
406	>	shouldThrow();
407	>	} catch (IllegalArgumentException success) {}
408		}
409
410		/**
411	<	* a deserialized serialized semaphore has same number of permits
412	<	*/
413	<	public void testSerialization() throws Exception {
414	<	Semaphore l = new Semaphore(3, false);
415	<	l.acquire();
416	<	l.release();
417	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
418	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
419	<	out.writeObject(l);
420	<	out.close();
379	<
380	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
381	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
382	<	Semaphore r = (Semaphore) in.readObject();
383	<	assertEquals(3, r.availablePermits());
384	<	assertFalse(r.isFair());
385	<	r.acquire();
386	<	r.release();
411	>	* reducePermits(-N) throws IllegalArgumentException
412	>	*/
413	>	public void testReducePermitsIAE()      { testReducePermitsIAE(false); }
414	>	public void testReducePermitsIAE_fair() { testReducePermitsIAE(true); }
415	>	public void testReducePermitsIAE(boolean fair) {
416	>	PublicSemaphore s = new PublicSemaphore(10, fair);
417	>	try {
418	>	s.reducePermits(-1);
419	>	shouldThrow();
420	>	} catch (IllegalArgumentException success) {}
421		}
422
389	–
423		/**
424	<	* Zero, negative, and positive initial values are allowed in constructor
424	>	* reducePermits reduces number of permits
425		*/
426	<	public void testConstructor_fair() {
427	<	Semaphore s0 = new Semaphore(0, true);
428	<	assertEquals(0, s0.availablePermits());
429	<	assertTrue(s0.isFair());
430	<	Semaphore s1 = new Semaphore(-1, true);
431	<	assertEquals(-1, s1.availablePermits());
432	<	Semaphore s2 = new Semaphore(-1, true);
433	<	assertEquals(-1, s2.availablePermits());
426	>	public void testReducePermits()      { testReducePermits(false); }
427	>	public void testReducePermits_fair() { testReducePermits(true); }
428	>	public void testReducePermits(boolean fair) {
429	>	PublicSemaphore s = new PublicSemaphore(10, fair);
430	>	assertEquals(10, s.availablePermits());
431	>	s.reducePermits(0);
432	>	assertEquals(10, s.availablePermits());
433	>	s.reducePermits(1);
434	>	assertEquals(9, s.availablePermits());
435	>	s.reducePermits(10);
436	>	assertEquals(-1, s.availablePermits());
437	>	s.reducePermits(10);
438	>	assertEquals(-11, s.availablePermits());
439	>	s.reducePermits(0);
440	>	assertEquals(-11, s.availablePermits());
441		}
442
443		/**
444	<	* tryAcquire succeeds when sufficient permits, else fails
445	<	*/
446	<	public void testTryAcquireInSameThread_fair() {
447	<	Semaphore s = new Semaphore(2, true);
448	<	assertEquals(2, s.availablePermits());
449	<	assertTrue(s.tryAcquire());
450	<	assertTrue(s.tryAcquire());
451	<	assertEquals(0, s.availablePermits());
452	<	assertFalse(s.tryAcquire());
444	>	* a reserialized semaphore has same number of permits and
445	>	* fairness, but no queued threads
446	>	*/
447	>	public void testSerialization()      { testSerialization(false); }
448	>	public void testSerialization_fair() { testSerialization(true); }
449	>	public void testSerialization(boolean fair) {
450	>	try {
451	>	Semaphore s = new Semaphore(3, fair);
452	>	s.acquire();
453	>	s.acquire();
454	>	s.release();
455	>
456	>	Semaphore clone = serialClone(s);
457	>	assertEquals(fair, s.isFair());
458	>	assertEquals(fair, clone.isFair());
459	>	assertEquals(2, s.availablePermits());
460	>	assertEquals(2, clone.availablePermits());
461	>	clone.acquire();
462	>	clone.acquire();
463	>	clone.release();
464	>	assertEquals(2, s.availablePermits());
465	>	assertEquals(1, clone.availablePermits());
466	>
467	>	s = new Semaphore(0, fair);
468	>	Thread t = newStartedThread(new InterruptibleLockRunnable(s));
469	>	waitForQueuedThreads(s);
470	>	clone = serialClone(s);
471	>	assertEquals(fair, s.isFair());
472	>	assertEquals(fair, clone.isFair());
473	>	assertEquals(0, s.availablePermits());
474	>	assertEquals(0, clone.availablePermits());
475	>	assertTrue(s.hasQueuedThreads());
476	>	assertFalse(clone.hasQueuedThreads());
477	>	s.release();
478	>	awaitTermination(t);
479	>	assertFalse(s.hasQueuedThreads());
480	>	assertFalse(clone.hasQueuedThreads());
481	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
482		}
483
484		/**
485		* tryAcquire(n) succeeds when sufficient permits, else fails
486		*/
487	<	public void testTryAcquireNInSameThread_fair() {
488	<	Semaphore s = new Semaphore(2, true);
487	>	public void testTryAcquireNInSameThread()      { testTryAcquireNInSameThread(false); }
488	>	public void testTryAcquireNInSameThread_fair() { testTryAcquireNInSameThread(true); }
489	>	public void testTryAcquireNInSameThread(boolean fair) {
490	>	Semaphore s = new Semaphore(2, fair);
491	>	assertEquals(2, s.availablePermits());
492	>	assertFalse(s.tryAcquire(3));
493		assertEquals(2, s.availablePermits());
494		assertTrue(s.tryAcquire(2));
495		assertEquals(0, s.availablePermits());
496	<	assertFalse(s.tryAcquire());
497	<	}
498	<
426	<	/**
427	<	* Acquire and release of semaphore succeed if initially available
428	<	*/
429	<	public void testAcquireReleaseInSameThread_fair()
430	<	throws InterruptedException {
431	<	Semaphore s = new Semaphore(1, true);
432	<	s.acquire();
433	<	s.release();
434	<	s.acquire();
435	<	s.release();
436	<	s.acquire();
437	<	s.release();
438	<	s.acquire();
439	<	s.release();
440	<	s.acquire();
441	<	s.release();
442	<	assertEquals(1, s.availablePermits());
443	<	}
444	<
445	<	/**
446	<	* Acquire(n) and release(n) of semaphore succeed if initially available
447	<	*/
448	<	public void testAcquireReleaseNInSameThread_fair()
449	<	throws InterruptedException {
450	<	Semaphore s = new Semaphore(1, true);
451	<	s.release(1);
452	<	s.acquire(1);
453	<	s.release(2);
454	<	s.acquire(2);
455	<	s.release(3);
456	<	s.acquire(3);
457	<	s.release(4);
458	<	s.acquire(4);
459	<	s.release(5);
460	<	s.acquire(5);
461	<	assertEquals(1, s.availablePermits());
462	<	}
463	<
464	<	/**
465	<	* Acquire(n) and release(n) of semaphore succeed if initially available
466	<	*/
467	<	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
468	<	Semaphore s = new Semaphore(1, true);
469	<	s.release(1);
470	<	s.acquireUninterruptibly(1);
471	<	s.release(2);
472	<	s.acquireUninterruptibly(2);
473	<	s.release(3);
474	<	s.acquireUninterruptibly(3);
475	<	s.release(4);
476	<	s.acquireUninterruptibly(4);
477	<	s.release(5);
478	<	s.acquireUninterruptibly(5);
479	<	assertEquals(1, s.availablePermits());
480	<	}
481	<
482	<	/**
483	<	* release(n) in one thread enables timed acquire(n) in another thread
484	<	*/
485	<	public void testTimedAcquireReleaseNInSameThread_fair()
486	<	throws InterruptedException {
487	<	Semaphore s = new Semaphore(1, true);
488	<	s.release(1);
489	<	assertTrue(s.tryAcquire(1, SHORT_DELAY_MS, MILLISECONDS));
490	<	s.release(2);
491	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
492	<	s.release(3);
493	<	assertTrue(s.tryAcquire(3, SHORT_DELAY_MS, MILLISECONDS));
494	<	s.release(4);
495	<	assertTrue(s.tryAcquire(4, SHORT_DELAY_MS, MILLISECONDS));
496	<	s.release(5);
497	<	assertTrue(s.tryAcquire(5, SHORT_DELAY_MS, MILLISECONDS));
498	<	assertEquals(1, s.availablePermits());
499	<	}
500	<
501	<	/**
502	<	* release in one thread enables timed acquire in another thread
503	<	*/
504	<	public void testTimedAcquireReleaseInSameThread_fair()
505	<	throws InterruptedException {
506	<	Semaphore s = new Semaphore(1, true);
507	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
508	<	s.release();
509	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
510	<	s.release();
511	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
512	<	s.release();
513	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
514	<	s.release();
515	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
516	<	s.release();
517	<	assertEquals(1, s.availablePermits());
496	>	assertFalse(s.tryAcquire(1));
497	>	assertFalse(s.tryAcquire(2));
498	>	assertEquals(0, s.availablePermits());
499		}
500
501		/**
502	<	* A release in one thread enables an acquire in another thread
502	>	* acquire succeeds if permits available
503		*/
504	<	public void testAcquireReleaseInDifferentThreads_fair()
505	<	throws InterruptedException {
506	<	final Semaphore s = new Semaphore(0, true);
507	<	Thread t = new Thread(new CheckedRunnable() {
508	<	public void realRun() throws InterruptedException {
509	<	s.acquire();
510	<	s.acquire();
511	<	s.acquire();
512	<	s.acquire();
513	<	}});
514	<
515	<	t.start();
516	<	Thread.sleep(SHORT_DELAY_MS);
517	<	s.release();
518	<	s.release();
519	<	s.release();
520	<	s.release();
521	<	s.release();
522	<	s.release();
523	<	t.join();
524	<	assertEquals(2, s.availablePermits());
504	>	public void testReleaseAcquireSameThread_acquire()       { testReleaseAcquireSameThread(false, AcquireMethod.acquire); }
505	>	public void testReleaseAcquireSameThread_acquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquire); }
506	>	public void testReleaseAcquireSameThread_acquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireN); }
507	>	public void testReleaseAcquireSameThread_acquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireN); }
508	>	public void testReleaseAcquireSameThread_acquireUninterruptibly()       { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
509	>	public void testReleaseAcquireSameThread_acquireUninterruptibly_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
510	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
511	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
512	>	public void testReleaseAcquireSameThread_tryAcquire()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquire); }
513	>	public void testReleaseAcquireSameThread_tryAcquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquire); }
514	>	public void testReleaseAcquireSameThread_tryAcquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireN); }
515	>	public void testReleaseAcquireSameThread_tryAcquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireN); }
516	>	public void testReleaseAcquireSameThread_tryAcquireTimed()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimed); }
517	>	public void testReleaseAcquireSameThread_tryAcquireTimed_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimed); }
518	>	public void testReleaseAcquireSameThread_tryAcquireTimedN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimedN); }
519	>	public void testReleaseAcquireSameThread_tryAcquireTimedN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimedN); }
520	>	public void testReleaseAcquireSameThread(boolean fair,
521	>	final AcquireMethod acquirer) {
522	>	Semaphore s = new Semaphore(1, fair);
523	>	for (int i = 1; i < 6; i++) {
524	>	s.release(i);
525	>	assertEquals(1 + i, s.availablePermits());
526	>	try {
527	>	acquirer.acquire(s, i);
528	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
529	>	assertEquals(1, s.availablePermits());
530	>	}
531		}
532
533		/**
534	<	* release(n) in one thread enables acquire(n) in another thread
534	>	* release in one thread enables acquire in another thread
535		*/
536	<	public void testAcquireReleaseNInDifferentThreads_fair()
537	<	throws InterruptedException {
538	<	final Semaphore s = new Semaphore(0, true);
539	<	Thread t = new Thread(new CheckedRunnable() {
540	<	public void realRun() throws InterruptedException {
541	<	s.acquire();
542	<	s.release(2);
543	<	s.acquire();
544	<	}});
545	<
546	<	t.start();
547	<	Thread.sleep(SHORT_DELAY_MS);
548	<	s.release(2);
549	<	s.acquire(2);
550	<	s.release(1);
551	<	t.join();
536	>	public void testReleaseAcquireDifferentThreads_acquire()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquire); }
537	>	public void testReleaseAcquireDifferentThreads_acquire_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquire); }
538	>	public void testReleaseAcquireDifferentThreads_acquireN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireN); }
539	>	public void testReleaseAcquireDifferentThreads_acquireN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireN); }
540	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
541	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
542	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
543	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
544	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimed); }
545	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimed); }
546	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimedN); }
547	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimedN); }
548	>	public void testReleaseAcquireDifferentThreads(boolean fair,
549	>	final AcquireMethod acquirer) {
550	>	final Semaphore s = new Semaphore(0, fair);
551	>	final int rounds = 4;
552	>	long startTime = System.nanoTime();
553	>	Thread t = newStartedThread(new CheckedRunnable() {
554	>	public void realRun() throws InterruptedException {
555	>	for (int i = 0; i < rounds; i++) {
556	>	assertFalse(s.hasQueuedThreads());
557	>	if (i % 2 == 0)
558	>	acquirer.acquire(s);
559	>	else
560	>	acquirer.acquire(s, 3);
561	>	}}});
562	>
563	>	for (int i = 0; i < rounds; i++) {
564	>	while (! (s.availablePermits() == 0 && s.hasQueuedThreads()))
565	>	Thread.yield();
566	>	assertTrue(t.isAlive());
567	>	if (i % 2 == 0)
568	>	s.release();
569	>	else
570	>	s.release(3);
571	>	}
572	>	awaitTermination(t);
573	>	assertEquals(0, s.availablePermits());
574	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
575		}
576
577		/**
578	<	* release(n) in one thread enables acquire(n) in another thread
578	>	* fair locks are strictly FIFO
579		*/
580	<	public void testAcquireReleaseNInDifferentThreads_fair2()
581	<	throws InterruptedException {
582	<	final Semaphore s = new Semaphore(0, true);
583	<	Thread t = new Thread(new CheckedRunnable() {
580	>	public void testFairLocksFifo() {
581	>	final PublicSemaphore s = new PublicSemaphore(1, true);
582	>	final CountDownLatch pleaseRelease = new CountDownLatch(1);
583	>	Thread t1 = newStartedThread(new CheckedRunnable() {
584		public void realRun() throws InterruptedException {
585	<	s.acquire(2);
586	<	s.acquire(2);
577	<	s.release(4);
585	>	// Will block; permits are available, but not three
586	>	s.acquire(3);
587		}});
588
589	<	t.start();
581	<	Thread.sleep(SHORT_DELAY_MS);
582	<	s.release(6);
583	<	s.acquire(2);
584	<	s.acquire(2);
585	<	s.release(2);
586	<	t.join();
587	<	}
589	>	waitForQueuedThreads(s);
590
591	<
590	<	/**
591	<	* release in one thread enables timed acquire in another thread
592	<	*/
593	<	public void testTimedAcquireReleaseInDifferentThreads_fair()
594	<	throws InterruptedException {
595	<	final Semaphore s = new Semaphore(1, true);
596	<	Thread t = new Thread(new CheckedRunnable() {
591	>	Thread t2 = newStartedThread(new CheckedRunnable() {
592		public void realRun() throws InterruptedException {
593	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
594	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
595	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
601	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
602	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
603	<	}});
593	>	// Will fail, even though 1 permit is available
594	>	assertFalse(s.tryAcquire(0L, MILLISECONDS));
595	>	assertFalse(s.tryAcquire(1, 0L, MILLISECONDS));
596
597	<	t.start();
598	<	s.release();
607	<	s.release();
608	<	s.release();
609	<	s.release();
610	<	s.release();
611	<	t.join();
612	<	}
613	<
614	<	/**
615	<	* release(n) in one thread enables timed acquire(n) in another thread
616	<	*/
617	<	public void testTimedAcquireReleaseNInDifferentThreads_fair()
618	<	throws InterruptedException {
619	<	final Semaphore s = new Semaphore(2, true);
620	<	Thread t = new Thread(new CheckedRunnable() {
621	<	public void realRun() throws InterruptedException {
622	<	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
623	<	s.release(2);
624	<	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
597	>	// untimed tryAcquire will barge and succeed
598	>	assertTrue(s.tryAcquire());
599		s.release(2);
600	<	}});
601	<
628	<	t.start();
629	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
630	<	s.release(2);
631	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
632	<	s.release(2);
633	<	t.join();
634	<	}
600	>	assertTrue(s.tryAcquire(2));
601	>	s.release();
602
603	<	/**
604	<	* A waiting acquire blocks interruptibly
638	<	*/
639	<	public void testAcquire_InterruptedException_fair()
640	<	throws InterruptedException {
641	<	final Semaphore s = new Semaphore(0, true);
642	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
643	<	public void realRun() throws InterruptedException {
603	>	pleaseRelease.countDown();
604	>	// Will queue up behind t1, even though 1 permit is available
605		s.acquire();
606		}});
607
608	<	t.start();
609	<	Thread.sleep(SHORT_DELAY_MS);
610	<	t.interrupt();
611	<	t.join();
612	<	}
613	<
614	<	/**
615	<	* A waiting acquire(n) blocks interruptibly
655	<	*/
656	<	public void testAcquireN_InterruptedException_fair()
657	<	throws InterruptedException {
658	<	final Semaphore s = new Semaphore(2, true);
659	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
660	<	public void realRun() throws InterruptedException {
661	<	s.acquire(3);
662	<	}});
663	<
664	<	t.start();
665	<	Thread.sleep(SHORT_DELAY_MS);
666	<	t.interrupt();
667	<	t.join();
668	<	}
669	<
670	<	/**
671	<	*  A waiting tryAcquire blocks interruptibly
672	<	*/
673	<	public void testTryAcquire_InterruptedException_fair()
674	<	throws InterruptedException {
675	<	final Semaphore s = new Semaphore(0, true);
676	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
677	<	public void realRun() throws InterruptedException {
678	<	s.tryAcquire(MEDIUM_DELAY_MS, MILLISECONDS);
679	<	}});
680	<
681	<	t.start();
682	<	Thread.sleep(SHORT_DELAY_MS);
683	<	t.interrupt();
684	<	t.join();
685	<	}
686	<
687	<	/**
688	<	*  A waiting tryAcquire(n) blocks interruptibly
689	<	*/
690	<	public void testTryAcquireN_InterruptedException_fair()
691	<	throws InterruptedException {
692	<	final Semaphore s = new Semaphore(1, true);
693	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
694	<	public void realRun() throws InterruptedException {
695	<	s.tryAcquire(4, MEDIUM_DELAY_MS, MILLISECONDS);
696	<	}});
697	<
698	<	t.start();
699	<	Thread.sleep(SHORT_DELAY_MS);
700	<	t.interrupt();
701	<	t.join();
702	<	}
703	<
704	<	/**
705	<	* getQueueLength reports number of waiting threads
706	<	*/
707	<	public void testGetQueueLength_fair() throws InterruptedException {
708	<	final Semaphore lock = new Semaphore(1, true);
709	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
710	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
711	<	assertEquals(0, lock.getQueueLength());
712	<	lock.acquireUninterruptibly();
713	<	t1.start();
714	<	Thread.sleep(SHORT_DELAY_MS);
715	<	assertEquals(1, lock.getQueueLength());
716	<	t2.start();
717	<	Thread.sleep(SHORT_DELAY_MS);
718	<	assertEquals(2, lock.getQueueLength());
719	<	t1.interrupt();
720	<	Thread.sleep(SHORT_DELAY_MS);
721	<	assertEquals(1, lock.getQueueLength());
722	<	lock.release();
723	<	Thread.sleep(SHORT_DELAY_MS);
724	<	assertEquals(0, lock.getQueueLength());
725	<	t1.join();
726	<	t2.join();
727	<	}
728	<
729	<
730	<	/**
731	<	* a deserialized serialized semaphore has same number of permits
732	<	*/
733	<	public void testSerialization_fair() throws Exception {
734	<	Semaphore l = new Semaphore(3, true);
735	<
736	<	l.acquire();
737	<	l.release();
738	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
739	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
740	<	out.writeObject(l);
741	<	out.close();
742	<
743	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
744	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
745	<	Semaphore r = (Semaphore) in.readObject();
746	<	assertEquals(3, r.availablePermits());
747	<	assertTrue(r.isFair());
748	<	r.acquire();
749	<	r.release();
750	<	}
608	>	await(pleaseRelease);
609	>	waitForQueuedThread(s, t2);
610	>	s.release(2);
611	>	awaitTermination(t1);
612	>	assertTrue(t2.isAlive());
613	>	s.release();
614	>	awaitTermination(t2);
615	>	}
616
617		/**
618		* toString indicates current number of permits
619		*/
620	<	public void testToString() {
621	<	Semaphore s = new Semaphore(0);
622	<	String us = s.toString();
623	<	assertTrue(us.indexOf("Permits = 0") >= 0);
620	>	public void testToString()      { testToString(false); }
621	>	public void testToString_fair() { testToString(true); }
622	>	public void testToString(boolean fair) {
623	>	PublicSemaphore s = new PublicSemaphore(0, fair);
624	>	assertTrue(s.toString().contains("Permits = 0"));
625		s.release();
626	<	String s1 = s.toString();
627	<	assertTrue(s1.indexOf("Permits = 1") >= 0);
628	<	s.release();
629	<	String s2 = s.toString();
630	<	assertTrue(s2.indexOf("Permits = 2") >= 0);
626	>	assertTrue(s.toString().contains("Permits = 1"));
627	>	s.release(2);
628	>	assertTrue(s.toString().contains("Permits = 3"));
629	>	s.reducePermits(5);
630	>	assertTrue(s.toString().contains("Permits = -2"));
631		}
632
633		}

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