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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 1.41 by jsr166, Sun May 14 04:18:31 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
53	<	* interrupted
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 87 | 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
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
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());
211	<	}
197	>	public void testTryAcquire_timeout() {
198	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
199	>	final Semaphore s = new Semaphore(0, fair);
200	>	final long startTime = System.nanoTime();
201	>	try { assertFalse(s.tryAcquire(timeoutMillis(), MILLISECONDS)); }
202	>	catch (InterruptedException e) { threadUnexpectedException(e); }
203	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
204	>	}
205	>
206	>	/**
207	>	* timed tryAcquire(N) times out
208	>	*/
209	>	public void testTryAcquireN_timeout() {
210	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
211	>	final Semaphore s = new Semaphore(2, fair);
212	>	final long startTime = System.nanoTime();
213	>	try { assertFalse(s.tryAcquire(3, timeoutMillis(), MILLISECONDS)); }
214	>	catch (InterruptedException e) { threadUnexpectedException(e); }
215	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
216	>	}
217	>
218	>	/**
219	>	* acquire(), acquire(N), timed tryAcquired, timed tryAcquire(N)
220	>	* are interruptible
221	>	*/
222	>	public void testInterruptible_acquire()               { testInterruptible(false, AcquireMethod.acquire); }
223	>	public void testInterruptible_acquire_fair()          { testInterruptible(true,  AcquireMethod.acquire); }
224	>	public void testInterruptible_acquireN()              { testInterruptible(false, AcquireMethod.acquireN); }
225	>	public void testInterruptible_acquireN_fair()         { testInterruptible(true,  AcquireMethod.acquireN); }
226	>	public void testInterruptible_tryAcquireTimed()       { testInterruptible(false, AcquireMethod.tryAcquireTimed); }
227	>	public void testInterruptible_tryAcquireTimed_fair()  { testInterruptible(true,  AcquireMethod.tryAcquireTimed); }
228	>	public void testInterruptible_tryAcquireTimedN()      { testInterruptible(false, AcquireMethod.tryAcquireTimedN); }
229	>	public void testInterruptible_tryAcquireTimedN_fair() { testInterruptible(true,  AcquireMethod.tryAcquireTimedN); }
230	>	public void testInterruptible(boolean fair, final AcquireMethod acquirer) {
231	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
232	>	final java.util.concurrent.CyclicBarrier pleaseInterrupt
233	>	= new java.util.concurrent.CyclicBarrier(2);
234	>	Thread t = newStartedThread(new CheckedRunnable() {
235	>	public void realRun() {
236	>	// Interrupt before acquire
237	>	Thread.currentThread().interrupt();
238	>	try {
239	>	acquirer.acquire(s);
240	>	shouldThrow();
241	>	} catch (InterruptedException success) {}
242	>	assertFalse(Thread.interrupted());
243	>
244	>	// Interrupt before acquire(N)
245	>	Thread.currentThread().interrupt();
246	>	try {
247	>	acquirer.acquire(s, 3);
248	>	shouldThrow();
249	>	} catch (InterruptedException success) {}
250	>	assertFalse(Thread.interrupted());
251	>
252	>	// Interrupt during acquire
253	>	await(pleaseInterrupt);
254	>	try {
255	>	acquirer.acquire(s);
256	>	shouldThrow();
257	>	} catch (InterruptedException success) {}
258	>	assertFalse(Thread.interrupted());
259	>
260	>	// Interrupt during acquire(N)
261	>	await(pleaseInterrupt);
262	>	try {
263	>	acquirer.acquire(s, 3);
264	>	shouldThrow();
265	>	} catch (InterruptedException success) {}
266	>	assertFalse(Thread.interrupted());
267	>	}});
268	>
269	>	for (int n = 2; n-->0; ) {
270	>	await(pleaseInterrupt);
271	>	assertThreadBlocks(t, acquirer.parkedState());
272	>	t.interrupt();
273	>	}
274
275	<	/**
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());
275	>	awaitTermination(t);
276		}
277
278		/**
279	<	* A release in one thread enables an acquire in another thread
279	>	* acquireUninterruptibly(), acquireUninterruptibly(N) are
280	>	* uninterruptible
281		*/
282	<	public void testAcquireReleaseInDifferentThreads()
283	<	throws InterruptedException {
284	<	final Semaphore s = new Semaphore(0, false);
285	<	Thread t = new Thread(new CheckedRunnable() {
286	<	public void realRun() throws InterruptedException {
287	<	s.acquire();
288	<	s.release();
168	<	s.release();
169	<	s.acquire();
170	<	}});
171	<
172	<	t.start();
173	<	Thread.sleep(SHORT_DELAY_MS);
174	<	s.release();
175	<	s.release();
176	<	s.acquire();
177	<	s.acquire();
178	<	s.release();
179	<	t.join();
180	<	}
282	>	public void testUninterruptible_acquireUninterruptibly()       { testUninterruptible(false, AcquireMethod.acquireUninterruptibly); }
283	>	public void testUninterruptible_acquireUninterruptibly_fair()  { testUninterruptible(true,  AcquireMethod.acquireUninterruptibly); }
284	>	public void testUninterruptible_acquireUninterruptiblyN()      { testUninterruptible(false, AcquireMethod.acquireUninterruptiblyN); }
285	>	public void testUninterruptible_acquireUninterruptiblyN_fair() { testUninterruptible(true,  AcquireMethod.acquireUninterruptiblyN); }
286	>	public void testUninterruptible(boolean fair, final AcquireMethod acquirer) {
287	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
288	>	final Semaphore pleaseInterrupt = new Semaphore(-1, fair);
289
290	<	/**
183	<	* A release in one thread enables an uninterruptible acquire in another thread
184	<	*/
185	<	public void testUninterruptibleAcquireReleaseInDifferentThreads()
186	<	throws InterruptedException {
187	<	final Semaphore s = new Semaphore(0, false);
188	<	Thread t = new Thread(new CheckedRunnable() {
290	>	Thread t1 = newStartedThread(new CheckedRunnable() {
291		public void realRun() throws InterruptedException {
292	<	s.acquireUninterruptibly();
293	<	s.release();
294	<	s.release();
295	<	s.acquireUninterruptibly();
292	>	// Interrupt before acquire
293	>	pleaseInterrupt.release();
294	>	Thread.currentThread().interrupt();
295	>	acquirer.acquire(s);
296	>	assertTrue(Thread.interrupted());
297		}});
298
299	<	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() {
299	>	Thread t2 = newStartedThread(new CheckedRunnable() {
300		public void realRun() throws InterruptedException {
301	<	s.release();
302	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
303	<	s.release();
304	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
301	>	// Interrupt during acquire
302	>	pleaseInterrupt.release();
303	>	acquirer.acquire(s);
304	>	assertTrue(Thread.interrupted());
305		}});
306
307	<	t.start();
308	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
309	<	s.release();
310	<	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() {
237	<	public void realRun() throws InterruptedException {
238	<	s.acquire();
239	<	}});
307	>	await(pleaseInterrupt);
308	>	waitForQueuedThread(s, t1);
309	>	waitForQueuedThread(s, t2);
310	>	t2.interrupt();
311
312	<	t.start();
313	<	Thread.sleep(SHORT_DELAY_MS);
243	<	t.interrupt();
244	<	t.join();
245	<	}
312	>	assertThreadBlocks(t1, Thread.State.WAITING);
313	>	assertThreadBlocks(t2, Thread.State.WAITING);
314
315	<	/**
248	<	*  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	<	}});
315	>	s.release(2);
316
317	<	t.start();
318	<	Thread.sleep(SHORT_DELAY_MS);
260	<	t.interrupt();
261	<	t.join();
317	>	awaitTermination(t1);
318	>	awaitTermination(t2);
319		}
320
321		/**
322		* hasQueuedThreads reports whether there are waiting threads
323		*/
324	<	public void testHasQueuedThreads() throws InterruptedException {
325	<	final Semaphore lock = new Semaphore(1, false);
326	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
327	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
324	>	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
325	>	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
326	>	public void testHasQueuedThreads(boolean fair) {
327	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
328		assertFalse(lock.hasQueuedThreads());
329		lock.acquireUninterruptibly();
330	<	t1.start();
331	<	Thread.sleep(SHORT_DELAY_MS);
330	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
331	>	waitForQueuedThread(lock, t1);
332		assertTrue(lock.hasQueuedThreads());
333	<	t2.start();
334	<	Thread.sleep(SHORT_DELAY_MS);
333	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
334	>	waitForQueuedThread(lock, t2);
335		assertTrue(lock.hasQueuedThreads());
336		t1.interrupt();
337	<	Thread.sleep(SHORT_DELAY_MS);
337	>	awaitTermination(t1);
338		assertTrue(lock.hasQueuedThreads());
339		lock.release();
340	<	Thread.sleep(SHORT_DELAY_MS);
340	>	awaitTermination(t2);
341		assertFalse(lock.hasQueuedThreads());
285	–	t1.join();
286	–	t2.join();
342		}
343
344		/**
345		* getQueueLength reports number of waiting threads
346		*/
347	<	public void testGetQueueLength() throws InterruptedException {
348	<	final Semaphore lock = new Semaphore(1, false);
349	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
350	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
347	>	public void testGetQueueLength()      { testGetQueueLength(false); }
348	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
349	>	public void testGetQueueLength(boolean fair) {
350	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
351		assertEquals(0, lock.getQueueLength());
352		lock.acquireUninterruptibly();
353	<	t1.start();
354	<	Thread.sleep(SHORT_DELAY_MS);
353	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
354	>	waitForQueuedThread(lock, t1);
355		assertEquals(1, lock.getQueueLength());
356	<	t2.start();
357	<	Thread.sleep(SHORT_DELAY_MS);
356	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
357	>	waitForQueuedThread(lock, t2);
358		assertEquals(2, lock.getQueueLength());
359		t1.interrupt();
360	<	Thread.sleep(SHORT_DELAY_MS);
360	>	awaitTermination(t1);
361		assertEquals(1, lock.getQueueLength());
362		lock.release();
363	<	Thread.sleep(SHORT_DELAY_MS);
363	>	awaitTermination(t2);
364		assertEquals(0, lock.getQueueLength());
310	–	t1.join();
311	–	t2.join();
365		}
366
367		/**
368		* getQueuedThreads includes waiting threads
369		*/
370	<	public void testGetQueuedThreads() throws InterruptedException {
371	<	final PublicSemaphore lock = new PublicSemaphore(1, false);
372	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
373	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
370	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
371	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
372	>	public void testGetQueuedThreads(boolean fair) {
373	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
374		assertTrue(lock.getQueuedThreads().isEmpty());
375		lock.acquireUninterruptibly();
376		assertTrue(lock.getQueuedThreads().isEmpty());
377	<	t1.start();
378	<	Thread.sleep(SHORT_DELAY_MS);
377	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
378	>	waitForQueuedThread(lock, t1);
379		assertTrue(lock.getQueuedThreads().contains(t1));
380	<	t2.start();
381	<	Thread.sleep(SHORT_DELAY_MS);
380	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
381	>	waitForQueuedThread(lock, t2);
382		assertTrue(lock.getQueuedThreads().contains(t1));
383		assertTrue(lock.getQueuedThreads().contains(t2));
384		t1.interrupt();
385	<	Thread.sleep(SHORT_DELAY_MS);
385	>	awaitTermination(t1);
386		assertFalse(lock.getQueuedThreads().contains(t1));
387		assertTrue(lock.getQueuedThreads().contains(t2));
388		lock.release();
389	<	Thread.sleep(SHORT_DELAY_MS);
389	>	awaitTermination(t2);
390		assertTrue(lock.getQueuedThreads().isEmpty());
338	–	t1.join();
339	–	t2.join();
391		}
392
393		/**
394		* drainPermits reports and removes given number of permits
395		*/
396	<	public void testDrainPermits() {
397	<	Semaphore s = new Semaphore(0, false);
396	>	public void testDrainPermits()      { testDrainPermits(false); }
397	>	public void testDrainPermits_fair() { testDrainPermits(true); }
398	>	public void testDrainPermits(boolean fair) {
399	>	Semaphore s = new Semaphore(0, fair);
400		assertEquals(0, s.availablePermits());
401		assertEquals(0, s.drainPermits());
402		s.release(10);
#	Line 354 | Line 407 | public class SemaphoreTest extends JSR16
407		}
408
409		/**
410	<	* reducePermits reduces number of permits
410	>	* release(-N) throws IllegalArgumentException
411		*/
412	<	public void testReducePermits() {
413	<	PublicSemaphore s = new PublicSemaphore(10, false);
414	<	assertEquals(10, s.availablePermits());
415	<	s.reducePermits(1);
416	<	assertEquals(9, s.availablePermits());
417	<	s.reducePermits(10);
418	<	assertEquals(-1, s.availablePermits());
412	>	public void testReleaseIAE()      { testReleaseIAE(false); }
413	>	public void testReleaseIAE_fair() { testReleaseIAE(true); }
414	>	public void testReleaseIAE(boolean fair) {
415	>	Semaphore s = new Semaphore(10, fair);
416	>	try {
417	>	s.release(-1);
418	>	shouldThrow();
419	>	} catch (IllegalArgumentException success) {}
420		}
421
422		/**
423	<	* a deserialized serialized semaphore has same number of permits
424	<	*/
425	<	public void testSerialization() throws Exception {
426	<	Semaphore l = new Semaphore(3, false);
427	<	l.acquire();
428	<	l.release();
429	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
430	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
431	<	out.writeObject(l);
432	<	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();
423	>	* reducePermits(-N) throws IllegalArgumentException
424	>	*/
425	>	public void testReducePermitsIAE()      { testReducePermitsIAE(false); }
426	>	public void testReducePermitsIAE_fair() { testReducePermitsIAE(true); }
427	>	public void testReducePermitsIAE(boolean fair) {
428	>	PublicSemaphore s = new PublicSemaphore(10, fair);
429	>	try {
430	>	s.reducePermits(-1);
431	>	shouldThrow();
432	>	} catch (IllegalArgumentException success) {}
433		}
434
389	–
435		/**
436	<	* Zero, negative, and positive initial values are allowed in constructor
436	>	* reducePermits reduces number of permits
437		*/
438	<	public void testConstructor_fair() {
439	<	Semaphore s0 = new Semaphore(0, true);
440	<	assertEquals(0, s0.availablePermits());
441	<	assertTrue(s0.isFair());
442	<	Semaphore s1 = new Semaphore(-1, true);
443	<	assertEquals(-1, s1.availablePermits());
444	<	Semaphore s2 = new Semaphore(-1, true);
445	<	assertEquals(-1, s2.availablePermits());
438	>	public void testReducePermits()      { testReducePermits(false); }
439	>	public void testReducePermits_fair() { testReducePermits(true); }
440	>	public void testReducePermits(boolean fair) {
441	>	PublicSemaphore s = new PublicSemaphore(10, fair);
442	>	assertEquals(10, s.availablePermits());
443	>	s.reducePermits(0);
444	>	assertEquals(10, s.availablePermits());
445	>	s.reducePermits(1);
446	>	assertEquals(9, s.availablePermits());
447	>	s.reducePermits(10);
448	>	assertEquals(-1, s.availablePermits());
449	>	s.reducePermits(10);
450	>	assertEquals(-11, s.availablePermits());
451	>	s.reducePermits(0);
452	>	assertEquals(-11, s.availablePermits());
453		}
454
455		/**
456	<	* tryAcquire succeeds when sufficient permits, else fails
457	<	*/
458	<	public void testTryAcquireInSameThread_fair() {
459	<	Semaphore s = new Semaphore(2, true);
460	<	assertEquals(2, s.availablePermits());
461	<	assertTrue(s.tryAcquire());
462	<	assertTrue(s.tryAcquire());
463	<	assertEquals(0, s.availablePermits());
464	<	assertFalse(s.tryAcquire());
456	>	* a reserialized semaphore has same number of permits and
457	>	* fairness, but no queued threads
458	>	*/
459	>	public void testSerialization()      { testSerialization(false); }
460	>	public void testSerialization_fair() { testSerialization(true); }
461	>	public void testSerialization(boolean fair) {
462	>	try {
463	>	Semaphore s = new Semaphore(3, fair);
464	>	s.acquire();
465	>	s.acquire();
466	>	s.release();
467	>
468	>	Semaphore clone = serialClone(s);
469	>	assertEquals(fair, s.isFair());
470	>	assertEquals(fair, clone.isFair());
471	>	assertEquals(2, s.availablePermits());
472	>	assertEquals(2, clone.availablePermits());
473	>	clone.acquire();
474	>	clone.acquire();
475	>	clone.release();
476	>	assertEquals(2, s.availablePermits());
477	>	assertEquals(1, clone.availablePermits());
478	>	assertFalse(s.hasQueuedThreads());
479	>	assertFalse(clone.hasQueuedThreads());
480	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
481	>
482	>	{
483	>	PublicSemaphore s = new PublicSemaphore(0, fair);
484	>	Thread t = newStartedThread(new InterruptibleLockRunnable(s));
485	>	// waitForQueuedThreads(s); // suffers from "flicker", so ...
486	>	waitForQueuedThread(s, t);  // ... we use this instead
487	>	PublicSemaphore clone = serialClone(s);
488	>	assertEquals(fair, s.isFair());
489	>	assertEquals(fair, clone.isFair());
490	>	assertEquals(0, s.availablePermits());
491	>	assertEquals(0, clone.availablePermits());
492	>	assertTrue(s.hasQueuedThreads());
493	>	assertFalse(clone.hasQueuedThreads());
494	>	s.release();
495	>	awaitTermination(t);
496	>	assertFalse(s.hasQueuedThreads());
497	>	assertFalse(clone.hasQueuedThreads());
498	>	}
499		}
500
501		/**
502		* tryAcquire(n) succeeds when sufficient permits, else fails
503		*/
504	<	public void testTryAcquireNInSameThread_fair() {
505	<	Semaphore s = new Semaphore(2, true);
504	>	public void testTryAcquireNInSameThread()      { testTryAcquireNInSameThread(false); }
505	>	public void testTryAcquireNInSameThread_fair() { testTryAcquireNInSameThread(true); }
506	>	public void testTryAcquireNInSameThread(boolean fair) {
507	>	Semaphore s = new Semaphore(2, fair);
508	>	assertEquals(2, s.availablePermits());
509	>	assertFalse(s.tryAcquire(3));
510		assertEquals(2, s.availablePermits());
511		assertTrue(s.tryAcquire(2));
512		assertEquals(0, s.availablePermits());
513	<	assertFalse(s.tryAcquire());
514	<	}
515	<
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());
513	>	assertFalse(s.tryAcquire(1));
514	>	assertFalse(s.tryAcquire(2));
515	>	assertEquals(0, s.availablePermits());
516		}
517
518		/**
519	<	* A release in one thread enables an acquire in another thread
519	>	* acquire succeeds if permits available
520		*/
521	<	public void testAcquireReleaseInDifferentThreads_fair()
522	<	throws InterruptedException {
523	<	final Semaphore s = new Semaphore(0, true);
524	<	Thread t = new Thread(new CheckedRunnable() {
525	<	public void realRun() throws InterruptedException {
526	<	s.acquire();
527	<	s.acquire();
528	<	s.acquire();
529	<	s.acquire();
530	<	}});
531	<
532	<	t.start();
533	<	Thread.sleep(SHORT_DELAY_MS);
534	<	s.release();
535	<	s.release();
536	<	s.release();
537	<	s.release();
538	<	s.release();
539	<	s.release();
540	<	t.join();
541	<	assertEquals(2, s.availablePermits());
521	>	public void testReleaseAcquireSameThread_acquire()       { testReleaseAcquireSameThread(false, AcquireMethod.acquire); }
522	>	public void testReleaseAcquireSameThread_acquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquire); }
523	>	public void testReleaseAcquireSameThread_acquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireN); }
524	>	public void testReleaseAcquireSameThread_acquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireN); }
525	>	public void testReleaseAcquireSameThread_acquireUninterruptibly()       { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
526	>	public void testReleaseAcquireSameThread_acquireUninterruptibly_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
527	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
528	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
529	>	public void testReleaseAcquireSameThread_tryAcquire()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquire); }
530	>	public void testReleaseAcquireSameThread_tryAcquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquire); }
531	>	public void testReleaseAcquireSameThread_tryAcquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireN); }
532	>	public void testReleaseAcquireSameThread_tryAcquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireN); }
533	>	public void testReleaseAcquireSameThread_tryAcquireTimed()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimed); }
534	>	public void testReleaseAcquireSameThread_tryAcquireTimed_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimed); }
535	>	public void testReleaseAcquireSameThread_tryAcquireTimedN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimedN); }
536	>	public void testReleaseAcquireSameThread_tryAcquireTimedN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimedN); }
537	>	public void testReleaseAcquireSameThread(boolean fair,
538	>	final AcquireMethod acquirer) {
539	>	Semaphore s = new Semaphore(1, fair);
540	>	for (int i = 1; i < 6; i++) {
541	>	s.release(i);
542	>	assertEquals(1 + i, s.availablePermits());
543	>	try {
544	>	acquirer.acquire(s, i);
545	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
546	>	assertEquals(1, s.availablePermits());
547	>	}
548		}
549
550		/**
551	<	* release(n) in one thread enables acquire(n) in another thread
551	>	* release in one thread enables acquire in another thread
552		*/
553	<	public void testAcquireReleaseNInDifferentThreads_fair()
554	<	throws InterruptedException {
555	<	final Semaphore s = new Semaphore(0, true);
556	<	Thread t = new Thread(new CheckedRunnable() {
557	<	public void realRun() throws InterruptedException {
558	<	s.acquire();
559	<	s.release(2);
560	<	s.acquire();
561	<	}});
562	<
563	<	t.start();
564	<	Thread.sleep(SHORT_DELAY_MS);
565	<	s.release(2);
566	<	s.acquire(2);
567	<	s.release(1);
568	<	t.join();
553	>	public void testReleaseAcquireDifferentThreads_acquire()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquire); }
554	>	public void testReleaseAcquireDifferentThreads_acquire_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquire); }
555	>	public void testReleaseAcquireDifferentThreads_acquireN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireN); }
556	>	public void testReleaseAcquireDifferentThreads_acquireN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireN); }
557	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
558	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
559	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
560	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
561	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimed); }
562	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimed); }
563	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimedN); }
564	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimedN); }
565	>	public void testReleaseAcquireDifferentThreads(boolean fair,
566	>	final AcquireMethod acquirer) {
567	>	final Semaphore s = new Semaphore(0, fair);
568	>	final int rounds = 4;
569	>	long startTime = System.nanoTime();
570	>	Thread t = newStartedThread(new CheckedRunnable() {
571	>	public void realRun() throws InterruptedException {
572	>	for (int i = 0; i < rounds; i++) {
573	>	assertFalse(s.hasQueuedThreads());
574	>	if (i % 2 == 0)
575	>	acquirer.acquire(s);
576	>	else
577	>	acquirer.acquire(s, 3);
578	>	}}});
579	>
580	>	for (int i = 0; i < rounds; i++) {
581	>	while (! (s.availablePermits() == 0 && s.hasQueuedThreads()))
582	>	Thread.yield();
583	>	assertTrue(t.isAlive());
584	>	if (i % 2 == 0)
585	>	s.release();
586	>	else
587	>	s.release(3);
588	>	}
589	>	awaitTermination(t);
590	>	assertEquals(0, s.availablePermits());
591	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
592		}
593
594		/**
595	<	* release(n) in one thread enables acquire(n) in another thread
595	>	* fair locks are strictly FIFO
596		*/
597	<	public void testAcquireReleaseNInDifferentThreads_fair2()
598	<	throws InterruptedException {
599	<	final Semaphore s = new Semaphore(0, true);
600	<	Thread t = new Thread(new CheckedRunnable() {
597	>	public void testFairLocksFifo() {
598	>	final PublicSemaphore s = new PublicSemaphore(1, true);
599	>	final CountDownLatch pleaseRelease = new CountDownLatch(1);
600	>	Thread t1 = newStartedThread(new CheckedRunnable() {
601		public void realRun() throws InterruptedException {
602	<	s.acquire(2);
603	<	s.acquire(2);
577	<	s.release(4);
602	>	// Will block; permits are available, but not three
603	>	s.acquire(3);
604		}});
605
606	<	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	<	}
606	>	waitForQueuedThread(s, t1);
607
608	<
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() {
608	>	Thread t2 = newStartedThread(new CheckedRunnable() {
609		public void realRun() throws InterruptedException {
610	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
611	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
612	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
601	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
602	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
603	<	}});
604	<
605	<	t.start();
606	<	s.release();
607	<	s.release();
608	<	s.release();
609	<	s.release();
610	<	s.release();
611	<	t.join();
612	<	}
610	>	// Will fail, even though 1 permit is available
611	>	assertFalse(s.tryAcquire(0L, MILLISECONDS));
612	>	assertFalse(s.tryAcquire(1, 0L, MILLISECONDS));
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));
614	>	// untimed tryAcquire will barge and succeed
615	>	assertTrue(s.tryAcquire());
616		s.release(2);
617	<	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
618	<	s.release(2);
626	<	}});
627	<
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	<	}
617	>	assertTrue(s.tryAcquire(2));
618	>	s.release();
619
620	<	/**
621	<	* 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 {
620	>	pleaseRelease.countDown();
621	>	// Will queue up behind t1, even though 1 permit is available
622		s.acquire();
623		}});
624
625	<	t.start();
626	<	Thread.sleep(SHORT_DELAY_MS);
627	<	t.interrupt();
628	<	t.join();
629	<	}
630	<
631	<	/**
654	<	* 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();
625	>	await(pleaseRelease);
626	>	waitForQueuedThread(s, t2);
627	>	s.release(2);
628	>	awaitTermination(t1);
629	>	assertTrue(t2.isAlive());
630	>	s.release();
631	>	awaitTermination(t2);
632		}
633
634		/**
635		* toString indicates current number of permits
636		*/
637	<	public void testToString() {
638	<	Semaphore s = new Semaphore(0);
639	<	String us = s.toString();
640	<	assertTrue(us.indexOf("Permits = 0") >= 0);
637	>	public void testToString()      { testToString(false); }
638	>	public void testToString_fair() { testToString(true); }
639	>	public void testToString(boolean fair) {
640	>	PublicSemaphore s = new PublicSemaphore(0, fair);
641	>	assertTrue(s.toString().contains("Permits = 0"));
642		s.release();
643	<	String s1 = s.toString();
644	<	assertTrue(s1.indexOf("Permits = 1") >= 0);
645	<	s.release();
646	<	String s2 = s.toString();
647	<	assertTrue(s2.indexOf("Permits = 2") >= 0);
643	>	assertTrue(s.toString().contains("Permits = 1"));
644	>	s.release(2);
645	>	assertTrue(s.toString().contains("Permits = 3"));
646	>	s.reducePermits(5);
647	>	assertTrue(s.toString().contains("Permits = -2"));
648		}
649
650		}

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