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

Comparing jsr166/src/test/tck/SemaphoreTest.java (file contents):
Revision 1.24 by jsr166, Wed Aug 25 00:07:03 2010 UTC vs.
Revision 1.39 by jsr166, Sun May 14 03:31:53 2017 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.*;
9		import static java.util.concurrent.TimeUnit.MILLISECONDS;
10	<	import java.io.*;
10	>
11	>	import java.util.Collection;
12	>	import java.util.concurrent.CountDownLatch;
13	>	import java.util.concurrent.Semaphore;
14	>	import java.util.concurrent.ThreadLocalRandom;
15	>
16	>	import junit.framework.AssertionFailedError;
17	>	import junit.framework.Test;
18	>	import junit.framework.TestSuite;
19
20		public class SemaphoreTest extends JSR166TestCase {
21		public static void main(String[] args) {
22	<	junit.textui.TestRunner.run(suite());
22	>	main(suite(), args);
23		}
24		public static Test suite() {
25		return new TestSuite(SemaphoreTest.class);
#	Line 24 | Line 29 | public class SemaphoreTest extends JSR16
29		* Subclass to expose protected methods
30		*/
31		static class PublicSemaphore extends Semaphore {
32	<	PublicSemaphore(int p, boolean f) { super(p, f); }
32	>	PublicSemaphore(int permits) { super(permits); }
33	>	PublicSemaphore(int permits, boolean fair) { super(permits, fair); }
34		public Collection<Thread> getQueuedThreads() {
35		return super.getQueuedThreads();
36		}
37	<	public void reducePermits(int p) {
38	<	super.reducePermits(p);
37	>	public boolean hasQueuedThread(Thread t) {
38	>	return super.getQueuedThreads().contains(t);
39	>	}
40	>	public void reducePermits(int reduction) {
41	>	super.reducePermits(reduction);
42		}
43		}
44
#	Line 38 | Line 47 | public class SemaphoreTest extends JSR16
47		*/
48		class InterruptibleLockRunnable extends CheckedRunnable {
49		final Semaphore lock;
50	<	InterruptibleLockRunnable(Semaphore l) { lock = l; }
50	>	InterruptibleLockRunnable(Semaphore s) { lock = s; }
51		public void realRun() {
52		try {
53		lock.acquire();
#	Line 47 | Line 56 | public class SemaphoreTest extends JSR16
56		}
57		}
58
50	–
59		/**
60		* A runnable calling acquire that expects to be interrupted
61		*/
62		class InterruptedLockRunnable extends CheckedInterruptedRunnable {
63		final Semaphore lock;
64	<	InterruptedLockRunnable(Semaphore l) { lock = l; }
64	>	InterruptedLockRunnable(Semaphore s) { lock = s; }
65		public void realRun() throws InterruptedException {
66		lock.acquire();
67		}
68		}
69
70		/**
71	<	* Zero, negative, and positive initial values are allowed in constructor
71	>	* Spin-waits until s.hasQueuedThread(t) becomes true.
72	>	*/
73	>	void waitForQueuedThread(PublicSemaphore s, Thread t) {
74	>	long startTime = System.nanoTime();
75	>	while (!s.hasQueuedThread(t)) {
76	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
77	>	throw new AssertionFailedError("timed out");
78	>	Thread.yield();
79	>	}
80	>	assertTrue(s.hasQueuedThreads());
81	>	assertTrue(t.isAlive());
82	>	}
83	>
84	>	/**
85	>	* Spin-waits until s.hasQueuedThreads() becomes true.
86		*/
87	<	public void testConstructor() {
88	<	for (int permits : new int[] { -1, 0, 1 }) {
89	<	for (boolean fair : new boolean[] { false, true }) {
90	<	Semaphore s = new Semaphore(permits, fair);
91	<	assertEquals(permits, s.availablePermits());
92	<	assertEquals(fair, s.isFair());
87	>	void waitForQueuedThreads(Semaphore s) {
88	>	long startTime = System.nanoTime();
89	>	while (!s.hasQueuedThreads()) {
90	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
91	>	throw new AssertionFailedError("timed out");
92	>	Thread.yield();
93	>	}
94	>	}
95	>
96	>	enum AcquireMethod {
97	>	acquire() {
98	>	void acquire(Semaphore s) throws InterruptedException {
99	>	s.acquire();
100	>	}
101	>	},
102	>	acquireN() {
103	>	void acquire(Semaphore s, int permits) throws InterruptedException {
104	>	s.acquire(permits);
105	>	}
106	>	},
107	>	acquireUninterruptibly() {
108	>	void acquire(Semaphore s) {
109	>	s.acquireUninterruptibly();
110	>	}
111	>	},
112	>	acquireUninterruptiblyN() {
113	>	void acquire(Semaphore s, int permits) {
114	>	s.acquireUninterruptibly(permits);
115		}
116	+	},
117	+	tryAcquire() {
118	+	void acquire(Semaphore s) {
119	+	assertTrue(s.tryAcquire());
120	+	}
121	+	},
122	+	tryAcquireN() {
123	+	void acquire(Semaphore s, int permits) {
124	+	assertTrue(s.tryAcquire(permits));
125	+	}
126	+	},
127	+	tryAcquireTimed() {
128	+	void acquire(Semaphore s) throws InterruptedException {
129	+	assertTrue(s.tryAcquire(2 * LONG_DELAY_MS, MILLISECONDS));
130	+	}
131	+	Thread.State parkedState() { return Thread.State.TIMED_WAITING; }
132	+	},
133	+	tryAcquireTimedN {
134	+	void acquire(Semaphore s, int permits) throws InterruptedException {
135	+	assertTrue(s.tryAcquire(permits, 2 * LONG_DELAY_MS, MILLISECONDS));
136	+	}
137	+	Thread.State parkedState() { return Thread.State.TIMED_WAITING; }
138	+	};
139	+
140	+	// Intentionally meta-circular
141	+
142	+	/** Acquires 1 permit. */
143	+	void acquire(Semaphore s) throws InterruptedException {
144	+	acquire(s, 1);
145	+	}
146	+	/** Acquires the given number of permits. */
147	+	void acquire(Semaphore s, int permits) throws InterruptedException {
148	+	for (int i = 0; i < permits; i++)
149	+	acquire(s);
150	+	}
151	+	Thread.State parkedState() { return Thread.State.WAITING; }
152	+	}
153	+
154	+	/**
155	+	* Zero, negative, and positive initial values are allowed in constructor
156	+	*/
157	+	public void testConstructor()      { testConstructor(false); }
158	+	public void testConstructor_fair() { testConstructor(true); }
159	+	public void testConstructor(boolean fair) {
160	+	for (int permits : new int[] { -42, -1, 0, 1, 42 }) {
161	+	Semaphore s = new Semaphore(permits, fair);
162	+	assertEquals(permits, s.availablePermits());
163	+	assertEquals(fair, s.isFair());
164		}
165		}
166
167		/**
168		* Constructor without fairness argument behaves as nonfair
169		*/
170	<	public void testConstructor2() {
171	<	for (int permits : new int[] { -1, 0, 1 }) {
170	>	public void testConstructorDefaultsToNonFair() {
171	>	for (int permits : new int[] { -42, -1, 0, 1, 42 }) {
172		Semaphore s = new Semaphore(permits);
173		assertEquals(permits, s.availablePermits());
174		assertFalse(s.isFair());
#	Line 86 | Line 178 | public class SemaphoreTest extends JSR16
178		/**
179		* tryAcquire succeeds when sufficient permits, else fails
180		*/
181	<	public void testTryAcquireInSameThread() {
182	<	Semaphore s = new Semaphore(2, false);
181	>	public void testTryAcquireInSameThread()      { testTryAcquireInSameThread(false); }
182	>	public void testTryAcquireInSameThread_fair() { testTryAcquireInSameThread(true); }
183	>	public void testTryAcquireInSameThread(boolean fair) {
184	>	Semaphore s = new Semaphore(2, fair);
185		assertEquals(2, s.availablePermits());
186		assertTrue(s.tryAcquire());
187		assertTrue(s.tryAcquire());
188		assertEquals(0, s.availablePermits());
189		assertFalse(s.tryAcquire());
190	+	assertFalse(s.tryAcquire());
191	+	assertEquals(0, s.availablePermits());
192		}
193
194		/**
195	<	* Acquire and release of semaphore succeed if initially available
100	<	*/
101	<	public void testAcquireReleaseInSameThread()
102	<	throws InterruptedException {
103	<	Semaphore s = new Semaphore(1, false);
104	<	s.acquire();
105	<	s.release();
106	<	s.acquire();
107	<	s.release();
108	<	s.acquire();
109	<	s.release();
110	<	s.acquire();
111	<	s.release();
112	<	s.acquire();
113	<	s.release();
114	<	assertEquals(1, s.availablePermits());
115	<	}
116	<
117	<	/**
118	<	* Uninterruptible acquire and release of semaphore succeed if
119	<	* initially available
195	>	* timed tryAcquire times out
196		*/
197	<	public void testAcquireUninterruptiblyReleaseInSameThread()
198	<	throws InterruptedException {
199	<	Semaphore s = new Semaphore(1, false);
200	<	s.acquireUninterruptibly();
201	<	s.release();
202	<	s.acquireUninterruptibly();
203	<	s.release();
204	<	s.acquireUninterruptibly();
205	<	s.release();
206	<	s.acquireUninterruptibly();
207	<	s.release();
208	<	s.acquireUninterruptibly();
209	<	s.release();
210	<	assertEquals(1, s.availablePermits());
197	>	public void testTryAcquire_timeout() {
198	>	final ThreadLocalRandom rnd = ThreadLocalRandom.current();
199	>	final boolean fair = rnd.nextBoolean();
200	>	final Semaphore s = new Semaphore(0, fair);
201	>	final long startTime = System.nanoTime();
202	>	try { assertFalse(s.tryAcquire(timeoutMillis(), MILLISECONDS)); }
203	>	catch (InterruptedException e) { threadUnexpectedException(e); }
204	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
205	>	}
206	>
207	>	/**
208	>	* timed tryAcquire(N) times out
209	>	*/
210	>	public void testTryAcquireN_timeout() {
211	>	final ThreadLocalRandom rnd = ThreadLocalRandom.current();
212	>	final boolean fair = rnd.nextBoolean();
213	>	final Semaphore s = new Semaphore(2, fair);
214	>	final long startTime = System.nanoTime();
215	>	try { assertFalse(s.tryAcquire(3, timeoutMillis(), MILLISECONDS)); }
216	>	catch (InterruptedException e) { threadUnexpectedException(e); }
217	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
218	>	}
219	>
220	>	/**
221	>	* acquire(), acquire(N), timed tryAcquired, timed tryAcquire(N)
222	>	* are interruptible
223	>	*/
224	>	public void testInterruptible_acquire()               { testInterruptible(false, AcquireMethod.acquire); }
225	>	public void testInterruptible_acquire_fair()          { testInterruptible(true,  AcquireMethod.acquire); }
226	>	public void testInterruptible_acquireN()              { testInterruptible(false, AcquireMethod.acquireN); }
227	>	public void testInterruptible_acquireN_fair()         { testInterruptible(true,  AcquireMethod.acquireN); }
228	>	public void testInterruptible_tryAcquireTimed()       { testInterruptible(false, AcquireMethod.tryAcquireTimed); }
229	>	public void testInterruptible_tryAcquireTimed_fair()  { testInterruptible(true,  AcquireMethod.tryAcquireTimed); }
230	>	public void testInterruptible_tryAcquireTimedN()      { testInterruptible(false, AcquireMethod.tryAcquireTimedN); }
231	>	public void testInterruptible_tryAcquireTimedN_fair() { testInterruptible(true,  AcquireMethod.tryAcquireTimedN); }
232	>	public void testInterruptible(boolean fair, final AcquireMethod acquirer) {
233	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
234	>	final java.util.concurrent.CyclicBarrier pleaseInterrupt
235	>	= new java.util.concurrent.CyclicBarrier(2);
236	>	Thread t = newStartedThread(new CheckedRunnable() {
237	>	public void realRun() {
238	>	// Interrupt before acquire
239	>	Thread.currentThread().interrupt();
240	>	try {
241	>	acquirer.acquire(s);
242	>	shouldThrow();
243	>	} catch (InterruptedException success) {}
244	>	assertFalse(Thread.interrupted());
245	>
246	>	// Interrupt before acquire(N)
247	>	Thread.currentThread().interrupt();
248	>	try {
249	>	acquirer.acquire(s, 3);
250	>	shouldThrow();
251	>	} catch (InterruptedException success) {}
252	>	assertFalse(Thread.interrupted());
253	>
254	>	// Interrupt during acquire
255	>	await(pleaseInterrupt);
256	>	try {
257	>	acquirer.acquire(s);
258	>	shouldThrow();
259	>	} catch (InterruptedException success) {}
260	>	assertFalse(Thread.interrupted());
261	>
262	>	// Interrupt during acquire(N)
263	>	await(pleaseInterrupt);
264	>	try {
265	>	acquirer.acquire(s, 3);
266	>	shouldThrow();
267	>	} catch (InterruptedException success) {}
268	>	assertFalse(Thread.interrupted());
269	>	}});
270	>
271	>	for (int n = 2; n-->0; ) {
272	>	await(pleaseInterrupt);
273	>	assertThreadBlocks(t, acquirer.parkedState());
274	>	t.interrupt();
275	>	}
276	>
277	>	awaitTermination(t);
278		}
279
280		/**
281	<	* Timed Acquire and release of semaphore succeed if
282	<	* initially available
281	>	* acquireUninterruptibly(), acquireUninterruptibly(N) are
282	>	* uninterruptible
283		*/
284	<	public void testTimedAcquireReleaseInSameThread()
285	<	throws InterruptedException {
286	<	Semaphore s = new Semaphore(1, false);
287	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
288	<	s.release();
289	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
290	<	s.release();
148	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
149	<	s.release();
150	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
151	<	s.release();
152	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
153	<	s.release();
154	<	assertEquals(1, s.availablePermits());
155	<	}
284	>	public void testUninterruptible_acquireUninterruptibly()       { testUninterruptible(false, AcquireMethod.acquireUninterruptibly); }
285	>	public void testUninterruptible_acquireUninterruptibly_fair()  { testUninterruptible(true,  AcquireMethod.acquireUninterruptibly); }
286	>	public void testUninterruptible_acquireUninterruptiblyN()      { testUninterruptible(false, AcquireMethod.acquireUninterruptiblyN); }
287	>	public void testUninterruptible_acquireUninterruptiblyN_fair() { testUninterruptible(true,  AcquireMethod.acquireUninterruptiblyN); }
288	>	public void testUninterruptible(boolean fair, final AcquireMethod acquirer) {
289	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
290	>	final Semaphore pleaseInterrupt = new Semaphore(-1, fair);
291
292	<	/**
158	<	* A release in one thread enables an acquire in another thread
159	<	*/
160	<	public void testAcquireReleaseInDifferentThreads()
161	<	throws InterruptedException {
162	<	final Semaphore s = new Semaphore(0, false);
163	<	Thread t = new Thread(new CheckedRunnable() {
292	>	Thread t1 = newStartedThread(new CheckedRunnable() {
293		public void realRun() throws InterruptedException {
294	<	s.acquire();
295	<	s.release();
296	<	s.release();
297	<	s.acquire();
294	>	// Interrupt before acquire
295	>	pleaseInterrupt.release();
296	>	Thread.currentThread().interrupt();
297	>	acquirer.acquire(s);
298	>	assertTrue(Thread.interrupted());
299		}});
300
301	<	t.start();
172	<	Thread.sleep(SHORT_DELAY_MS);
173	<	s.release();
174	<	s.release();
175	<	s.acquire();
176	<	s.acquire();
177	<	s.release();
178	<	t.join();
179	<	}
180	<
181	<	/**
182	<	* A release in one thread enables an uninterruptible acquire in another thread
183	<	*/
184	<	public void testUninterruptibleAcquireReleaseInDifferentThreads()
185	<	throws InterruptedException {
186	<	final Semaphore s = new Semaphore(0, false);
187	<	Thread t = new Thread(new CheckedRunnable() {
188	<	public void realRun() throws InterruptedException {
189	<	s.acquireUninterruptibly();
190	<	s.release();
191	<	s.release();
192	<	s.acquireUninterruptibly();
193	<	}});
194	<
195	<	t.start();
196	<	Thread.sleep(SHORT_DELAY_MS);
197	<	s.release();
198	<	s.release();
199	<	s.acquireUninterruptibly();
200	<	s.acquireUninterruptibly();
201	<	s.release();
202	<	t.join();
203	<	}
204	<
205	<
206	<	/**
207	<	*  A release in one thread enables a timed acquire in another thread
208	<	*/
209	<	public void testTimedAcquireReleaseInDifferentThreads()
210	<	throws InterruptedException {
211	<	final Semaphore s = new Semaphore(1, false);
212	<	Thread t = new Thread(new CheckedRunnable() {
301	>	Thread t2 = newStartedThread(new CheckedRunnable() {
302		public void realRun() throws InterruptedException {
303	<	s.release();
304	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
305	<	s.release();
306	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
303	>	// Interrupt during acquire
304	>	pleaseInterrupt.release();
305	>	acquirer.acquire(s);
306	>	assertTrue(Thread.interrupted());
307		}});
308
309	<	t.start();
310	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
311	<	s.release();
312	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
224	<	s.release();
225	<	s.release();
226	<	t.join();
227	<	}
228	<
229	<	/**
230	<	* A waiting acquire blocks interruptibly
231	<	*/
232	<	public void testAcquire_InterruptedException()
233	<	throws InterruptedException {
234	<	final Semaphore s = new Semaphore(0, false);
235	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
236	<	public void realRun() throws InterruptedException {
237	<	s.acquire();
238	<	}});
309	>	await(pleaseInterrupt);
310	>	waitForQueuedThread(s, t1);
311	>	waitForQueuedThread(s, t2);
312	>	t2.interrupt();
313
314	<	t.start();
315	<	Thread.sleep(SHORT_DELAY_MS);
242	<	t.interrupt();
243	<	t.join();
244	<	}
314	>	assertThreadBlocks(t1, Thread.State.WAITING);
315	>	assertThreadBlocks(t2, Thread.State.WAITING);
316
317	<	/**
247	<	*  A waiting timed acquire blocks interruptibly
248	<	*/
249	<	public void testTryAcquire_InterruptedException()
250	<	throws InterruptedException {
251	<	final Semaphore s = new Semaphore(0, false);
252	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
253	<	public void realRun() throws InterruptedException {
254	<	s.tryAcquire(MEDIUM_DELAY_MS, MILLISECONDS);
255	<	}});
317	>	s.release(2);
318
319	<	t.start();
320	<	Thread.sleep(SHORT_DELAY_MS);
259	<	t.interrupt();
260	<	t.join();
319	>	awaitTermination(t1);
320	>	awaitTermination(t2);
321		}
322
323		/**
324		* hasQueuedThreads reports whether there are waiting threads
325		*/
326	<	public void testHasQueuedThreads() throws InterruptedException {
327	<	final Semaphore lock = new Semaphore(1, false);
328	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
329	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
326	>	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
327	>	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
328	>	public void testHasQueuedThreads(boolean fair) {
329	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
330		assertFalse(lock.hasQueuedThreads());
331		lock.acquireUninterruptibly();
332	<	t1.start();
333	<	Thread.sleep(SHORT_DELAY_MS);
332	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
333	>	waitForQueuedThread(lock, t1);
334		assertTrue(lock.hasQueuedThreads());
335	<	t2.start();
336	<	Thread.sleep(SHORT_DELAY_MS);
335	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
336	>	waitForQueuedThread(lock, t2);
337		assertTrue(lock.hasQueuedThreads());
338		t1.interrupt();
339	<	Thread.sleep(SHORT_DELAY_MS);
339	>	awaitTermination(t1);
340		assertTrue(lock.hasQueuedThreads());
341		lock.release();
342	<	Thread.sleep(SHORT_DELAY_MS);
342	>	awaitTermination(t2);
343		assertFalse(lock.hasQueuedThreads());
284	–	t1.join();
285	–	t2.join();
344		}
345
346		/**
347		* getQueueLength reports number of waiting threads
348		*/
349	<	public void testGetQueueLength() throws InterruptedException {
350	<	final Semaphore lock = new Semaphore(1, false);
351	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
352	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
349	>	public void testGetQueueLength()      { testGetQueueLength(false); }
350	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
351	>	public void testGetQueueLength(boolean fair) {
352	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
353		assertEquals(0, lock.getQueueLength());
354		lock.acquireUninterruptibly();
355	<	t1.start();
356	<	Thread.sleep(SHORT_DELAY_MS);
355	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
356	>	waitForQueuedThread(lock, t1);
357		assertEquals(1, lock.getQueueLength());
358	<	t2.start();
359	<	Thread.sleep(SHORT_DELAY_MS);
358	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
359	>	waitForQueuedThread(lock, t2);
360		assertEquals(2, lock.getQueueLength());
361		t1.interrupt();
362	<	Thread.sleep(SHORT_DELAY_MS);
362	>	awaitTermination(t1);
363		assertEquals(1, lock.getQueueLength());
364		lock.release();
365	<	Thread.sleep(SHORT_DELAY_MS);
365	>	awaitTermination(t2);
366		assertEquals(0, lock.getQueueLength());
309	–	t1.join();
310	–	t2.join();
367		}
368
369		/**
370		* getQueuedThreads includes waiting threads
371		*/
372	<	public void testGetQueuedThreads() throws InterruptedException {
373	<	final PublicSemaphore lock = new PublicSemaphore(1, false);
374	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
375	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
372	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
373	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
374	>	public void testGetQueuedThreads(boolean fair) {
375	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
376		assertTrue(lock.getQueuedThreads().isEmpty());
377		lock.acquireUninterruptibly();
378		assertTrue(lock.getQueuedThreads().isEmpty());
379	<	t1.start();
380	<	Thread.sleep(SHORT_DELAY_MS);
379	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
380	>	waitForQueuedThread(lock, t1);
381		assertTrue(lock.getQueuedThreads().contains(t1));
382	<	t2.start();
383	<	Thread.sleep(SHORT_DELAY_MS);
382	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
383	>	waitForQueuedThread(lock, t2);
384		assertTrue(lock.getQueuedThreads().contains(t1));
385		assertTrue(lock.getQueuedThreads().contains(t2));
386		t1.interrupt();
387	<	Thread.sleep(SHORT_DELAY_MS);
387	>	awaitTermination(t1);
388		assertFalse(lock.getQueuedThreads().contains(t1));
389		assertTrue(lock.getQueuedThreads().contains(t2));
390		lock.release();
391	<	Thread.sleep(SHORT_DELAY_MS);
391	>	awaitTermination(t2);
392		assertTrue(lock.getQueuedThreads().isEmpty());
337	–	t1.join();
338	–	t2.join();
393		}
394
395		/**
396		* drainPermits reports and removes given number of permits
397		*/
398	<	public void testDrainPermits() {
399	<	Semaphore s = new Semaphore(0, false);
398	>	public void testDrainPermits()      { testDrainPermits(false); }
399	>	public void testDrainPermits_fair() { testDrainPermits(true); }
400	>	public void testDrainPermits(boolean fair) {
401	>	Semaphore s = new Semaphore(0, fair);
402		assertEquals(0, s.availablePermits());
403		assertEquals(0, s.drainPermits());
404		s.release(10);
#	Line 353 | Line 409 | public class SemaphoreTest extends JSR16
409		}
410
411		/**
412	<	* reducePermits reduces number of permits
412	>	* release(-N) throws IllegalArgumentException
413		*/
414	<	public void testReducePermits() {
415	<	PublicSemaphore s = new PublicSemaphore(10, false);
416	<	assertEquals(10, s.availablePermits());
417	<	s.reducePermits(1);
418	<	assertEquals(9, s.availablePermits());
419	<	s.reducePermits(10);
420	<	assertEquals(-1, s.availablePermits());
414	>	public void testReleaseIAE()      { testReleaseIAE(false); }
415	>	public void testReleaseIAE_fair() { testReleaseIAE(true); }
416	>	public void testReleaseIAE(boolean fair) {
417	>	Semaphore s = new Semaphore(10, fair);
418	>	try {
419	>	s.release(-1);
420	>	shouldThrow();
421	>	} catch (IllegalArgumentException success) {}
422		}
423
424		/**
425	<	* a deserialized serialized semaphore has same number of permits
426	<	*/
427	<	public void testSerialization() throws Exception {
428	<	Semaphore l = new Semaphore(3, false);
429	<	l.acquire();
430	<	l.release();
431	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
432	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
433	<	out.writeObject(l);
434	<	out.close();
378	<
379	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
380	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
381	<	Semaphore r = (Semaphore) in.readObject();
382	<	assertEquals(3, r.availablePermits());
383	<	assertFalse(r.isFair());
384	<	r.acquire();
385	<	r.release();
425	>	* reducePermits(-N) throws IllegalArgumentException
426	>	*/
427	>	public void testReducePermitsIAE()      { testReducePermitsIAE(false); }
428	>	public void testReducePermitsIAE_fair() { testReducePermitsIAE(true); }
429	>	public void testReducePermitsIAE(boolean fair) {
430	>	PublicSemaphore s = new PublicSemaphore(10, fair);
431	>	try {
432	>	s.reducePermits(-1);
433	>	shouldThrow();
434	>	} catch (IllegalArgumentException success) {}
435		}
436
388	–
437		/**
438	<	* Zero, negative, and positive initial values are allowed in constructor
438	>	* reducePermits reduces number of permits
439		*/
440	<	public void testConstructor_fair() {
441	<	Semaphore s0 = new Semaphore(0, true);
442	<	assertEquals(0, s0.availablePermits());
443	<	assertTrue(s0.isFair());
444	<	Semaphore s1 = new Semaphore(-1, true);
445	<	assertEquals(-1, s1.availablePermits());
446	<	Semaphore s2 = new Semaphore(-1, true);
447	<	assertEquals(-1, s2.availablePermits());
440	>	public void testReducePermits()      { testReducePermits(false); }
441	>	public void testReducePermits_fair() { testReducePermits(true); }
442	>	public void testReducePermits(boolean fair) {
443	>	PublicSemaphore s = new PublicSemaphore(10, fair);
444	>	assertEquals(10, s.availablePermits());
445	>	s.reducePermits(0);
446	>	assertEquals(10, s.availablePermits());
447	>	s.reducePermits(1);
448	>	assertEquals(9, s.availablePermits());
449	>	s.reducePermits(10);
450	>	assertEquals(-1, s.availablePermits());
451	>	s.reducePermits(10);
452	>	assertEquals(-11, s.availablePermits());
453	>	s.reducePermits(0);
454	>	assertEquals(-11, s.availablePermits());
455		}
456
457		/**
458	<	* tryAcquire succeeds when sufficient permits, else fails
459	<	*/
460	<	public void testTryAcquireInSameThread_fair() {
461	<	Semaphore s = new Semaphore(2, true);
462	<	assertEquals(2, s.availablePermits());
463	<	assertTrue(s.tryAcquire());
464	<	assertTrue(s.tryAcquire());
465	<	assertEquals(0, s.availablePermits());
466	<	assertFalse(s.tryAcquire());
458	>	* a reserialized semaphore has same number of permits and
459	>	* fairness, but no queued threads
460	>	*/
461	>	public void testSerialization()      { testSerialization(false); }
462	>	public void testSerialization_fair() { testSerialization(true); }
463	>	public void testSerialization(boolean fair) {
464	>	try {
465	>	Semaphore s = new Semaphore(3, fair);
466	>	s.acquire();
467	>	s.acquire();
468	>	s.release();
469	>
470	>	Semaphore clone = serialClone(s);
471	>	assertEquals(fair, s.isFair());
472	>	assertEquals(fair, clone.isFair());
473	>	assertEquals(2, s.availablePermits());
474	>	assertEquals(2, clone.availablePermits());
475	>	clone.acquire();
476	>	clone.acquire();
477	>	clone.release();
478	>	assertEquals(2, s.availablePermits());
479	>	assertEquals(1, clone.availablePermits());
480	>	assertFalse(s.hasQueuedThreads());
481	>	assertFalse(clone.hasQueuedThreads());
482	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
483	>
484	>	{
485	>	PublicSemaphore s = new PublicSemaphore(0, fair);
486	>	Thread t = newStartedThread(new InterruptibleLockRunnable(s));
487	>	// waitForQueuedThreads(s); // suffers from "flicker", so ...
488	>	waitForQueuedThread(s, t);  // ... we use this instead
489	>	PublicSemaphore clone = serialClone(s);
490	>	assertEquals(fair, s.isFair());
491	>	assertEquals(fair, clone.isFair());
492	>	assertEquals(0, s.availablePermits());
493	>	assertEquals(0, clone.availablePermits());
494	>	assertTrue(s.hasQueuedThreads());
495	>	assertFalse(clone.hasQueuedThreads());
496	>	s.release();
497	>	awaitTermination(t);
498	>	assertFalse(s.hasQueuedThreads());
499	>	assertFalse(clone.hasQueuedThreads());
500	>	}
501		}
502
503		/**
504		* tryAcquire(n) succeeds when sufficient permits, else fails
505		*/
506	<	public void testTryAcquireNInSameThread_fair() {
507	<	Semaphore s = new Semaphore(2, true);
506	>	public void testTryAcquireNInSameThread()      { testTryAcquireNInSameThread(false); }
507	>	public void testTryAcquireNInSameThread_fair() { testTryAcquireNInSameThread(true); }
508	>	public void testTryAcquireNInSameThread(boolean fair) {
509	>	Semaphore s = new Semaphore(2, fair);
510	>	assertEquals(2, s.availablePermits());
511	>	assertFalse(s.tryAcquire(3));
512		assertEquals(2, s.availablePermits());
513		assertTrue(s.tryAcquire(2));
514		assertEquals(0, s.availablePermits());
515	<	assertFalse(s.tryAcquire());
516	<	}
517	<
425	<	/**
426	<	* Acquire and release of semaphore succeed if initially available
427	<	*/
428	<	public void testAcquireReleaseInSameThread_fair()
429	<	throws InterruptedException {
430	<	Semaphore s = new Semaphore(1, true);
431	<	s.acquire();
432	<	s.release();
433	<	s.acquire();
434	<	s.release();
435	<	s.acquire();
436	<	s.release();
437	<	s.acquire();
438	<	s.release();
439	<	s.acquire();
440	<	s.release();
441	<	assertEquals(1, s.availablePermits());
442	<	}
443	<
444	<	/**
445	<	* Acquire(n) and release(n) of semaphore succeed if initially available
446	<	*/
447	<	public void testAcquireReleaseNInSameThread_fair()
448	<	throws InterruptedException {
449	<	Semaphore s = new Semaphore(1, true);
450	<	s.release(1);
451	<	s.acquire(1);
452	<	s.release(2);
453	<	s.acquire(2);
454	<	s.release(3);
455	<	s.acquire(3);
456	<	s.release(4);
457	<	s.acquire(4);
458	<	s.release(5);
459	<	s.acquire(5);
460	<	assertEquals(1, s.availablePermits());
461	<	}
462	<
463	<	/**
464	<	* Acquire(n) and release(n) of semaphore succeed if initially available
465	<	*/
466	<	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
467	<	Semaphore s = new Semaphore(1, true);
468	<	s.release(1);
469	<	s.acquireUninterruptibly(1);
470	<	s.release(2);
471	<	s.acquireUninterruptibly(2);
472	<	s.release(3);
473	<	s.acquireUninterruptibly(3);
474	<	s.release(4);
475	<	s.acquireUninterruptibly(4);
476	<	s.release(5);
477	<	s.acquireUninterruptibly(5);
478	<	assertEquals(1, s.availablePermits());
479	<	}
480	<
481	<	/**
482	<	* release(n) in one thread enables timed acquire(n) in another thread
483	<	*/
484	<	public void testTimedAcquireReleaseNInSameThread_fair()
485	<	throws InterruptedException {
486	<	Semaphore s = new Semaphore(1, true);
487	<	s.release(1);
488	<	assertTrue(s.tryAcquire(1, SHORT_DELAY_MS, MILLISECONDS));
489	<	s.release(2);
490	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
491	<	s.release(3);
492	<	assertTrue(s.tryAcquire(3, SHORT_DELAY_MS, MILLISECONDS));
493	<	s.release(4);
494	<	assertTrue(s.tryAcquire(4, SHORT_DELAY_MS, MILLISECONDS));
495	<	s.release(5);
496	<	assertTrue(s.tryAcquire(5, SHORT_DELAY_MS, MILLISECONDS));
497	<	assertEquals(1, s.availablePermits());
498	<	}
499	<
500	<	/**
501	<	* release in one thread enables timed acquire in another thread
502	<	*/
503	<	public void testTimedAcquireReleaseInSameThread_fair()
504	<	throws InterruptedException {
505	<	Semaphore s = new Semaphore(1, true);
506	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
507	<	s.release();
508	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
509	<	s.release();
510	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
511	<	s.release();
512	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
513	<	s.release();
514	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
515	<	s.release();
516	<	assertEquals(1, s.availablePermits());
515	>	assertFalse(s.tryAcquire(1));
516	>	assertFalse(s.tryAcquire(2));
517	>	assertEquals(0, s.availablePermits());
518		}
519
520		/**
521	<	* A release in one thread enables an acquire in another thread
521	>	* acquire succeeds if permits available
522		*/
523	<	public void testAcquireReleaseInDifferentThreads_fair()
524	<	throws InterruptedException {
525	<	final Semaphore s = new Semaphore(0, true);
526	<	Thread t = new Thread(new CheckedRunnable() {
527	<	public void realRun() throws InterruptedException {
528	<	s.acquire();
529	<	s.acquire();
530	<	s.acquire();
531	<	s.acquire();
532	<	}});
533	<
534	<	t.start();
535	<	Thread.sleep(SHORT_DELAY_MS);
536	<	s.release();
537	<	s.release();
538	<	s.release();
539	<	s.release();
540	<	s.release();
541	<	s.release();
542	<	t.join();
543	<	assertEquals(2, s.availablePermits());
523	>	public void testReleaseAcquireSameThread_acquire()       { testReleaseAcquireSameThread(false, AcquireMethod.acquire); }
524	>	public void testReleaseAcquireSameThread_acquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquire); }
525	>	public void testReleaseAcquireSameThread_acquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireN); }
526	>	public void testReleaseAcquireSameThread_acquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireN); }
527	>	public void testReleaseAcquireSameThread_acquireUninterruptibly()       { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
528	>	public void testReleaseAcquireSameThread_acquireUninterruptibly_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
529	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
530	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
531	>	public void testReleaseAcquireSameThread_tryAcquire()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquire); }
532	>	public void testReleaseAcquireSameThread_tryAcquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquire); }
533	>	public void testReleaseAcquireSameThread_tryAcquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireN); }
534	>	public void testReleaseAcquireSameThread_tryAcquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireN); }
535	>	public void testReleaseAcquireSameThread_tryAcquireTimed()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimed); }
536	>	public void testReleaseAcquireSameThread_tryAcquireTimed_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimed); }
537	>	public void testReleaseAcquireSameThread_tryAcquireTimedN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimedN); }
538	>	public void testReleaseAcquireSameThread_tryAcquireTimedN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimedN); }
539	>	public void testReleaseAcquireSameThread(boolean fair,
540	>	final AcquireMethod acquirer) {
541	>	Semaphore s = new Semaphore(1, fair);
542	>	for (int i = 1; i < 6; i++) {
543	>	s.release(i);
544	>	assertEquals(1 + i, s.availablePermits());
545	>	try {
546	>	acquirer.acquire(s, i);
547	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
548	>	assertEquals(1, s.availablePermits());
549	>	}
550		}
551
552		/**
553	<	* release(n) in one thread enables acquire(n) in another thread
553	>	* release in one thread enables acquire in another thread
554		*/
555	<	public void testAcquireReleaseNInDifferentThreads_fair()
556	<	throws InterruptedException {
557	<	final Semaphore s = new Semaphore(0, true);
558	<	Thread t = new Thread(new CheckedRunnable() {
559	<	public void realRun() throws InterruptedException {
560	<	s.acquire();
561	<	s.release(2);
562	<	s.acquire();
563	<	}});
564	<
565	<	t.start();
566	<	Thread.sleep(SHORT_DELAY_MS);
567	<	s.release(2);
568	<	s.acquire(2);
569	<	s.release(1);
570	<	t.join();
555	>	public void testReleaseAcquireDifferentThreads_acquire()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquire); }
556	>	public void testReleaseAcquireDifferentThreads_acquire_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquire); }
557	>	public void testReleaseAcquireDifferentThreads_acquireN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireN); }
558	>	public void testReleaseAcquireDifferentThreads_acquireN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireN); }
559	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
560	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
561	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
562	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
563	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimed); }
564	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimed); }
565	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimedN); }
566	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimedN); }
567	>	public void testReleaseAcquireDifferentThreads(boolean fair,
568	>	final AcquireMethod acquirer) {
569	>	final Semaphore s = new Semaphore(0, fair);
570	>	final int rounds = 4;
571	>	long startTime = System.nanoTime();
572	>	Thread t = newStartedThread(new CheckedRunnable() {
573	>	public void realRun() throws InterruptedException {
574	>	for (int i = 0; i < rounds; i++) {
575	>	assertFalse(s.hasQueuedThreads());
576	>	if (i % 2 == 0)
577	>	acquirer.acquire(s);
578	>	else
579	>	acquirer.acquire(s, 3);
580	>	}}});
581	>
582	>	for (int i = 0; i < rounds; i++) {
583	>	while (! (s.availablePermits() == 0 && s.hasQueuedThreads()))
584	>	Thread.yield();
585	>	assertTrue(t.isAlive());
586	>	if (i % 2 == 0)
587	>	s.release();
588	>	else
589	>	s.release(3);
590	>	}
591	>	awaitTermination(t);
592	>	assertEquals(0, s.availablePermits());
593	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
594		}
595
596		/**
597	<	* release(n) in one thread enables acquire(n) in another thread
597	>	* fair locks are strictly FIFO
598		*/
599	<	public void testAcquireReleaseNInDifferentThreads_fair2()
600	<	throws InterruptedException {
601	<	final Semaphore s = new Semaphore(0, true);
602	<	Thread t = new Thread(new CheckedRunnable() {
599	>	public void testFairLocksFifo() {
600	>	final PublicSemaphore s = new PublicSemaphore(1, true);
601	>	final CountDownLatch pleaseRelease = new CountDownLatch(1);
602	>	Thread t1 = newStartedThread(new CheckedRunnable() {
603		public void realRun() throws InterruptedException {
604	<	s.acquire(2);
605	<	s.acquire(2);
576	<	s.release(4);
604	>	// Will block; permits are available, but not three
605	>	s.acquire(3);
606		}});
607
608	<	t.start();
580	<	Thread.sleep(SHORT_DELAY_MS);
581	<	s.release(6);
582	<	s.acquire(2);
583	<	s.acquire(2);
584	<	s.release(2);
585	<	t.join();
586	<	}
608	>	waitForQueuedThread(s, t1);
609
610	<
589	<	/**
590	<	* release in one thread enables timed acquire in another thread
591	<	*/
592	<	public void testTimedAcquireReleaseInDifferentThreads_fair()
593	<	throws InterruptedException {
594	<	final Semaphore s = new Semaphore(1, true);
595	<	Thread t = new Thread(new CheckedRunnable() {
610	>	Thread t2 = newStartedThread(new CheckedRunnable() {
611		public void realRun() throws InterruptedException {
612	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
613	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
614	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
600	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
601	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
602	<	}});
603	<
604	<	t.start();
605	<	s.release();
606	<	s.release();
607	<	s.release();
608	<	s.release();
609	<	s.release();
610	<	t.join();
611	<	}
612	>	// Will fail, even though 1 permit is available
613	>	assertFalse(s.tryAcquire(0L, MILLISECONDS));
614	>	assertFalse(s.tryAcquire(1, 0L, MILLISECONDS));
615
616	<	/**
617	<	* release(n) in one thread enables timed acquire(n) in another thread
615	<	*/
616	<	public void testTimedAcquireReleaseNInDifferentThreads_fair()
617	<	throws InterruptedException {
618	<	final Semaphore s = new Semaphore(2, true);
619	<	Thread t = new Thread(new CheckedRunnable() {
620	<	public void realRun() throws InterruptedException {
621	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
616	>	// untimed tryAcquire will barge and succeed
617	>	assertTrue(s.tryAcquire());
618		s.release(2);
619	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
620	<	s.release(2);
625	<	}});
626	<
627	<	t.start();
628	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
629	<	s.release(2);
630	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
631	<	s.release(2);
632	<	t.join();
633	<	}
619	>	assertTrue(s.tryAcquire(2));
620	>	s.release();
621
622	<	/**
623	<	* A waiting acquire blocks interruptibly
637	<	*/
638	<	public void testAcquire_InterruptedException_fair()
639	<	throws InterruptedException {
640	<	final Semaphore s = new Semaphore(0, true);
641	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
642	<	public void realRun() throws InterruptedException {
622	>	pleaseRelease.countDown();
623	>	// Will queue up behind t1, even though 1 permit is available
624		s.acquire();
625		}});
626
627	<	t.start();
628	<	Thread.sleep(SHORT_DELAY_MS);
629	<	t.interrupt();
630	<	t.join();
631	<	}
632	<
633	<	/**
653	<	* A waiting acquire(n) blocks interruptibly
654	<	*/
655	<	public void testAcquireN_InterruptedException_fair()
656	<	throws InterruptedException {
657	<	final Semaphore s = new Semaphore(2, true);
658	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
659	<	public void realRun() throws InterruptedException {
660	<	s.acquire(3);
661	<	}});
662	<
663	<	t.start();
664	<	Thread.sleep(SHORT_DELAY_MS);
665	<	t.interrupt();
666	<	t.join();
667	<	}
668	<
669	<	/**
670	<	*  A waiting tryAcquire blocks interruptibly
671	<	*/
672	<	public void testTryAcquire_InterruptedException_fair()
673	<	throws InterruptedException {
674	<	final Semaphore s = new Semaphore(0, true);
675	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
676	<	public void realRun() throws InterruptedException {
677	<	s.tryAcquire(MEDIUM_DELAY_MS, MILLISECONDS);
678	<	}});
679	<
680	<	t.start();
681	<	Thread.sleep(SHORT_DELAY_MS);
682	<	t.interrupt();
683	<	t.join();
684	<	}
685	<
686	<	/**
687	<	*  A waiting tryAcquire(n) blocks interruptibly
688	<	*/
689	<	public void testTryAcquireN_InterruptedException_fair()
690	<	throws InterruptedException {
691	<	final Semaphore s = new Semaphore(1, true);
692	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
693	<	public void realRun() throws InterruptedException {
694	<	s.tryAcquire(4, MEDIUM_DELAY_MS, MILLISECONDS);
695	<	}});
696	<
697	<	t.start();
698	<	Thread.sleep(SHORT_DELAY_MS);
699	<	t.interrupt();
700	<	t.join();
701	<	}
702	<
703	<	/**
704	<	* getQueueLength reports number of waiting threads
705	<	*/
706	<	public void testGetQueueLength_fair() throws InterruptedException {
707	<	final Semaphore lock = new Semaphore(1, true);
708	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
709	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
710	<	assertEquals(0, lock.getQueueLength());
711	<	lock.acquireUninterruptibly();
712	<	t1.start();
713	<	Thread.sleep(SHORT_DELAY_MS);
714	<	assertEquals(1, lock.getQueueLength());
715	<	t2.start();
716	<	Thread.sleep(SHORT_DELAY_MS);
717	<	assertEquals(2, lock.getQueueLength());
718	<	t1.interrupt();
719	<	Thread.sleep(SHORT_DELAY_MS);
720	<	assertEquals(1, lock.getQueueLength());
721	<	lock.release();
722	<	Thread.sleep(SHORT_DELAY_MS);
723	<	assertEquals(0, lock.getQueueLength());
724	<	t1.join();
725	<	t2.join();
726	<	}
727	<
728	<
729	<	/**
730	<	* a deserialized serialized semaphore has same number of permits
731	<	*/
732	<	public void testSerialization_fair() throws Exception {
733	<	Semaphore l = new Semaphore(3, true);
734	<
735	<	l.acquire();
736	<	l.release();
737	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
738	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
739	<	out.writeObject(l);
740	<	out.close();
741	<
742	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
743	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
744	<	Semaphore r = (Semaphore) in.readObject();
745	<	assertEquals(3, r.availablePermits());
746	<	assertTrue(r.isFair());
747	<	r.acquire();
748	<	r.release();
627	>	await(pleaseRelease);
628	>	waitForQueuedThread(s, t2);
629	>	s.release(2);
630	>	awaitTermination(t1);
631	>	assertTrue(t2.isAlive());
632	>	s.release();
633	>	awaitTermination(t2);
634		}
635
636		/**
637		* toString indicates current number of permits
638		*/
639	<	public void testToString() {
640	<	Semaphore s = new Semaphore(0);
641	<	String us = s.toString();
642	<	assertTrue(us.indexOf("Permits = 0") >= 0);
639	>	public void testToString()      { testToString(false); }
640	>	public void testToString_fair() { testToString(true); }
641	>	public void testToString(boolean fair) {
642	>	PublicSemaphore s = new PublicSemaphore(0, fair);
643	>	assertTrue(s.toString().contains("Permits = 0"));
644		s.release();
645	<	String s1 = s.toString();
646	<	assertTrue(s1.indexOf("Permits = 1") >= 0);
647	<	s.release();
648	<	String s2 = s.toString();
649	<	assertTrue(s2.indexOf("Permits = 2") >= 0);
645	>	assertTrue(s.toString().contains("Permits = 1"));
646	>	s.release(2);
647	>	assertTrue(s.toString().contains("Permits = 3"));
648	>	s.reducePermits(5);
649	>	assertTrue(s.toString().contains("Permits = -2"));
650		}
651
652		}

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