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

Comparing jsr166/src/test/tck/SemaphoreTest.java (file contents):
Revision 1.19 by jsr166, Tue Nov 17 02:22:50 2009 UTC vs.
Revision 1.38 by jsr166, Sun May 14 00:38:16 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	>
15	>	import junit.framework.AssertionFailedError;
16	>	import junit.framework.Test;
17	>	import junit.framework.TestSuite;
18
19		public class SemaphoreTest extends JSR166TestCase {
20		public static void main(String[] args) {
21	<	junit.textui.TestRunner.run (suite());
21	>	main(suite(), args);
22		}
23		public static Test suite() {
24	<	return new TestSuite(SemaphoreTest.class);
24	>	return new TestSuite(SemaphoreTest.class);
25		}
26
27		/**
28		* Subclass to expose protected methods
29		*/
30		static class PublicSemaphore extends Semaphore {
31	<	PublicSemaphore(int p, boolean f) { super(p, f); }
31	>	PublicSemaphore(int permits) { super(permits); }
32	>	PublicSemaphore(int permits, boolean fair) { super(permits, fair); }
33		public Collection<Thread> getQueuedThreads() {
34		return super.getQueuedThreads();
35		}
36	<	public void reducePermits(int p) {
37	<	super.reducePermits(p);
36	>	public boolean hasQueuedThread(Thread t) {
37	>	return super.getQueuedThreads().contains(t);
38	>	}
39	>	public void reducePermits(int reduction) {
40	>	super.reducePermits(reduction);
41		}
42		}
43
#	Line 38 | Line 46 | public class SemaphoreTest extends JSR16
46		*/
47		class InterruptibleLockRunnable extends CheckedRunnable {
48		final Semaphore lock;
49	<	InterruptibleLockRunnable(Semaphore l) { lock = l; }
49	>	InterruptibleLockRunnable(Semaphore s) { lock = s; }
50		public void realRun() {
51		try {
52		lock.acquire();
#	Line 47 | Line 55 | public class SemaphoreTest extends JSR16
55		}
56		}
57
50	–
58		/**
59	<	* A runnable calling acquire that expects to be
53	<	* interrupted
59	>	* A runnable calling acquire that expects to be interrupted
60		*/
61		class InterruptedLockRunnable extends CheckedInterruptedRunnable {
62		final Semaphore lock;
63	<	InterruptedLockRunnable(Semaphore l) { lock = l; }
63	>	InterruptedLockRunnable(Semaphore s) { lock = s; }
64		public void realRun() throws InterruptedException {
65		lock.acquire();
66		}
67		}
68
69		/**
70	<	* Zero, negative, and positive initial values are allowed in constructor
70	>	* Spin-waits until s.hasQueuedThread(t) becomes true.
71	>	*/
72	>	void waitForQueuedThread(PublicSemaphore s, Thread t) {
73	>	long startTime = System.nanoTime();
74	>	while (!s.hasQueuedThread(t)) {
75	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
76	>	throw new AssertionFailedError("timed out");
77	>	Thread.yield();
78	>	}
79	>	assertTrue(s.hasQueuedThreads());
80	>	assertTrue(t.isAlive());
81	>	}
82	>
83	>	/**
84	>	* Spin-waits until s.hasQueuedThreads() becomes true.
85		*/
86	<	public void testConstructor() {
87	<	for (int permits : new int[] { -1, 0, 1 }) {
88	<	for (boolean fair : new boolean[] { false, true }) {
89	<	Semaphore s = new Semaphore(permits, fair);
90	<	assertEquals(permits, s.availablePermits());
91	<	assertEquals(fair, s.isFair());
86	>	void waitForQueuedThreads(Semaphore s) {
87	>	long startTime = System.nanoTime();
88	>	while (!s.hasQueuedThreads()) {
89	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
90	>	throw new AssertionFailedError("timed out");
91	>	Thread.yield();
92	>	}
93	>	}
94	>
95	>	enum AcquireMethod {
96	>	acquire() {
97	>	void acquire(Semaphore s) throws InterruptedException {
98	>	s.acquire();
99	>	}
100	>	},
101	>	acquireN() {
102	>	void acquire(Semaphore s, int permits) throws InterruptedException {
103	>	s.acquire(permits);
104	>	}
105	>	},
106	>	acquireUninterruptibly() {
107	>	void acquire(Semaphore s) {
108	>	s.acquireUninterruptibly();
109		}
110	+	},
111	+	acquireUninterruptiblyN() {
112	+	void acquire(Semaphore s, int permits) {
113	+	s.acquireUninterruptibly(permits);
114	+	}
115	+	},
116	+	tryAcquire() {
117	+	void acquire(Semaphore s) {
118	+	assertTrue(s.tryAcquire());
119	+	}
120	+	},
121	+	tryAcquireN() {
122	+	void acquire(Semaphore s, int permits) {
123	+	assertTrue(s.tryAcquire(permits));
124	+	}
125	+	},
126	+	tryAcquireTimed() {
127	+	void acquire(Semaphore s) throws InterruptedException {
128	+	assertTrue(s.tryAcquire(2 * LONG_DELAY_MS, MILLISECONDS));
129	+	}
130	+	Thread.State parkedState() { return Thread.State.TIMED_WAITING; }
131	+	},
132	+	tryAcquireTimedN {
133	+	void acquire(Semaphore s, int permits) throws InterruptedException {
134	+	assertTrue(s.tryAcquire(permits, 2 * LONG_DELAY_MS, MILLISECONDS));
135	+	}
136	+	Thread.State parkedState() { return Thread.State.TIMED_WAITING; }
137	+	};
138	+
139	+	// Intentionally meta-circular
140	+
141	+	/** Acquires 1 permit. */
142	+	void acquire(Semaphore s) throws InterruptedException {
143	+	acquire(s, 1);
144	+	}
145	+	/** Acquires the given number of permits. */
146	+	void acquire(Semaphore s, int permits) throws InterruptedException {
147	+	for (int i = 0; i < permits; i++)
148	+	acquire(s);
149	+	}
150	+	Thread.State parkedState() { return Thread.State.WAITING; }
151	+	}
152	+
153	+	/**
154	+	* Zero, negative, and positive initial values are allowed in constructor
155	+	*/
156	+	public void testConstructor()      { testConstructor(false); }
157	+	public void testConstructor_fair() { testConstructor(true); }
158	+	public void testConstructor(boolean fair) {
159	+	for (int permits : new int[] { -42, -1, 0, 1, 42 }) {
160	+	Semaphore s = new Semaphore(permits, fair);
161	+	assertEquals(permits, s.availablePermits());
162	+	assertEquals(fair, s.isFair());
163		}
164		}
165
166		/**
167		* Constructor without fairness argument behaves as nonfair
168		*/
169	<	public void testConstructor2() {
170	<	for (int permits : new int[] { -1, 0, 1 }) {
169	>	public void testConstructorDefaultsToNonFair() {
170	>	for (int permits : new int[] { -42, -1, 0, 1, 42 }) {
171		Semaphore s = new Semaphore(permits);
172		assertEquals(permits, s.availablePermits());
173		assertFalse(s.isFair());
#	Line 87 | Line 177 | public class SemaphoreTest extends JSR16
177		/**
178		* tryAcquire succeeds when sufficient permits, else fails
179		*/
180	<	public void testTryAcquireInSameThread() {
181	<	Semaphore s = new Semaphore(2, false);
180	>	public void testTryAcquireInSameThread()      { testTryAcquireInSameThread(false); }
181	>	public void testTryAcquireInSameThread_fair() { testTryAcquireInSameThread(true); }
182	>	public void testTryAcquireInSameThread(boolean fair) {
183	>	Semaphore s = new Semaphore(2, fair);
184		assertEquals(2, s.availablePermits());
185		assertTrue(s.tryAcquire());
186		assertTrue(s.tryAcquire());
187		assertEquals(0, s.availablePermits());
188		assertFalse(s.tryAcquire());
189	+	assertFalse(s.tryAcquire());
190	+	assertEquals(0, s.availablePermits());
191		}
192
193		/**
194	<	* 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
194	>	* timed tryAcquire times out
195		*/
196	<	public void testTimedAcquireReleaseInSameThread()
197	<	throws InterruptedException {
198	<	Semaphore s = new Semaphore(1, false);
199	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
200	<	s.release();
201	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
202	<	s.release();
203	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
204	<	s.release();
205	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
206	<	s.release();
207	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
208	<	s.release();
209	<	assertEquals(1, s.availablePermits());
196	>	public void testTryAcquire_timeout()      { testTryAcquire_timeout(false); }
197	>	public void testTryAcquire_timeout_fair() { testTryAcquire_timeout(true); }
198	>	public void testTryAcquire_timeout(boolean fair) {
199	>	Semaphore s = new Semaphore(0, fair);
200	>	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()      { testTryAcquireN_timeout(false); }
210	>	public void testTryAcquireN_timeout_fair() { testTryAcquireN_timeout(true); }
211	>	public void testTryAcquireN_timeout(boolean fair) {
212	>	Semaphore s = new Semaphore(2, fair);
213	>	long startTime = System.nanoTime();
214	>	try { assertFalse(s.tryAcquire(3, timeoutMillis(), MILLISECONDS)); }
215	>	catch (InterruptedException e) { threadUnexpectedException(e); }
216	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
217	>	}
218	>
219	>	/**
220	>	* acquire(), acquire(N), timed tryAcquired, timed tryAcquire(N)
221	>	* are interruptible
222	>	*/
223	>	public void testInterruptible_acquire()               { testInterruptible(false, AcquireMethod.acquire); }
224	>	public void testInterruptible_acquire_fair()          { testInterruptible(true,  AcquireMethod.acquire); }
225	>	public void testInterruptible_acquireN()              { testInterruptible(false, AcquireMethod.acquireN); }
226	>	public void testInterruptible_acquireN_fair()         { testInterruptible(true,  AcquireMethod.acquireN); }
227	>	public void testInterruptible_tryAcquireTimed()       { testInterruptible(false, AcquireMethod.tryAcquireTimed); }
228	>	public void testInterruptible_tryAcquireTimed_fair()  { testInterruptible(true,  AcquireMethod.tryAcquireTimed); }
229	>	public void testInterruptible_tryAcquireTimedN()      { testInterruptible(false, AcquireMethod.tryAcquireTimedN); }
230	>	public void testInterruptible_tryAcquireTimedN_fair() { testInterruptible(true,  AcquireMethod.tryAcquireTimedN); }
231	>	public void testInterruptible(boolean fair, final AcquireMethod acquirer) {
232	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
233	>	final java.util.concurrent.CyclicBarrier pleaseInterrupt
234	>	= new java.util.concurrent.CyclicBarrier(2);
235	>	Thread t = newStartedThread(new CheckedRunnable() {
236	>	public void realRun() {
237	>	// Interrupt before acquire
238	>	Thread.currentThread().interrupt();
239	>	try {
240	>	acquirer.acquire(s);
241	>	shouldThrow();
242	>	} catch (InterruptedException success) {}
243	>	assertFalse(Thread.interrupted());
244	>
245	>	// Interrupt before acquire(N)
246	>	Thread.currentThread().interrupt();
247	>	try {
248	>	acquirer.acquire(s, 3);
249	>	shouldThrow();
250	>	} catch (InterruptedException success) {}
251	>	assertFalse(Thread.interrupted());
252	>
253	>	// Interrupt during acquire
254	>	await(pleaseInterrupt);
255	>	try {
256	>	acquirer.acquire(s);
257	>	shouldThrow();
258	>	} catch (InterruptedException success) {}
259	>	assertFalse(Thread.interrupted());
260	>
261	>	// Interrupt during acquire(N)
262	>	await(pleaseInterrupt);
263	>	try {
264	>	acquirer.acquire(s, 3);
265	>	shouldThrow();
266	>	} catch (InterruptedException success) {}
267	>	assertFalse(Thread.interrupted());
268	>	}});
269	>
270	>	for (int n = 2; n-->0; ) {
271	>	await(pleaseInterrupt);
272	>	assertThreadBlocks(t, acquirer.parkedState());
273	>	t.interrupt();
274	>	}
275	>
276	>	awaitTermination(t);
277		}
278
279		/**
280	<	* A release in one thread enables an acquire in another thread
280	>	* acquireUninterruptibly(), acquireUninterruptibly(N) are
281	>	* uninterruptible
282		*/
283	<	public void testAcquireReleaseInDifferentThreads()
284	<	throws InterruptedException {
285	<	final Semaphore s = new Semaphore(0, false);
286	<	Thread t = new Thread(new CheckedRunnable() {
287	<	public void realRun() throws InterruptedException {
288	<	s.acquire();
289	<	s.release();
168	<	s.release();
169	<	s.acquire();
170	<	}});
283	>	public void testUninterruptible_acquireUninterruptibly()       { testUninterruptible(false, AcquireMethod.acquireUninterruptibly); }
284	>	public void testUninterruptible_acquireUninterruptibly_fair()  { testUninterruptible(true,  AcquireMethod.acquireUninterruptibly); }
285	>	public void testUninterruptible_acquireUninterruptiblyN()      { testUninterruptible(false, AcquireMethod.acquireUninterruptiblyN); }
286	>	public void testUninterruptible_acquireUninterruptiblyN_fair() { testUninterruptible(true,  AcquireMethod.acquireUninterruptiblyN); }
287	>	public void testUninterruptible(boolean fair, final AcquireMethod acquirer) {
288	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
289	>	final Semaphore pleaseInterrupt = new Semaphore(-1, fair);
290
291	<	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	<	}
181	<
182	<	/**
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() {
291	>	Thread t1 = newStartedThread(new CheckedRunnable() {
292		public void realRun() throws InterruptedException {
293	<	s.acquireUninterruptibly();
294	<	s.release();
295	<	s.release();
296	<	s.acquireUninterruptibly();
293	>	// Interrupt before acquire
294	>	pleaseInterrupt.release();
295	>	Thread.currentThread().interrupt();
296	>	acquirer.acquire(s);
297	>	assertTrue(Thread.interrupted());
298		}});
299
300	<	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() {
300	>	Thread t2 = newStartedThread(new CheckedRunnable() {
301		public void realRun() throws InterruptedException {
302	<	s.release();
303	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
304	<	s.release();
305	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
302	>	// Interrupt during acquire
303	>	pleaseInterrupt.release();
304	>	acquirer.acquire(s);
305	>	assertTrue(Thread.interrupted());
306		}});
307
308	<	t.start();
309	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
310	<	s.release();
311	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
225	<	s.release();
226	<	s.release();
227	<	t.join();
228	<	}
308	>	await(pleaseInterrupt);
309	>	waitForQueuedThread(s, t1);
310	>	waitForQueuedThread(s, t2);
311	>	t2.interrupt();
312
313	<	/**
314	<	* 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	<	}});
313	>	assertThreadBlocks(t1, Thread.State.WAITING);
314	>	assertThreadBlocks(t2, Thread.State.WAITING);
315
316	<	t.start();
242	<	Thread.sleep(SHORT_DELAY_MS);
243	<	t.interrupt();
244	<	t.join();
245	<	}
246	<
247	<	/**
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	<	}});
316	>	s.release(2);
317
318	<	t.start();
319	<	Thread.sleep(SHORT_DELAY_MS);
260	<	t.interrupt();
261	<	t.join();
318	>	awaitTermination(t1);
319	>	awaitTermination(t2);
320		}
321
322		/**
323		* hasQueuedThreads reports whether there are waiting threads
324		*/
325	<	public void testHasQueuedThreads() throws InterruptedException {
326	<	final Semaphore lock = new Semaphore(1, false);
327	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
328	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
325	>	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
326	>	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
327	>	public void testHasQueuedThreads(boolean fair) {
328	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
329		assertFalse(lock.hasQueuedThreads());
330		lock.acquireUninterruptibly();
331	<	t1.start();
332	<	Thread.sleep(SHORT_DELAY_MS);
331	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
332	>	waitForQueuedThread(lock, t1);
333		assertTrue(lock.hasQueuedThreads());
334	<	t2.start();
335	<	Thread.sleep(SHORT_DELAY_MS);
334	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
335	>	waitForQueuedThread(lock, t2);
336		assertTrue(lock.hasQueuedThreads());
337		t1.interrupt();
338	<	Thread.sleep(SHORT_DELAY_MS);
338	>	awaitTermination(t1);
339		assertTrue(lock.hasQueuedThreads());
340		lock.release();
341	<	Thread.sleep(SHORT_DELAY_MS);
341	>	awaitTermination(t2);
342		assertFalse(lock.hasQueuedThreads());
285	–	t1.join();
286	–	t2.join();
343		}
344
345		/**
346		* getQueueLength reports number of waiting threads
347		*/
348	<	public void testGetQueueLength() throws InterruptedException {
349	<	final Semaphore lock = new Semaphore(1, false);
350	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
351	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
348	>	public void testGetQueueLength()      { testGetQueueLength(false); }
349	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
350	>	public void testGetQueueLength(boolean fair) {
351	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
352		assertEquals(0, lock.getQueueLength());
353		lock.acquireUninterruptibly();
354	<	t1.start();
355	<	Thread.sleep(SHORT_DELAY_MS);
354	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
355	>	waitForQueuedThread(lock, t1);
356		assertEquals(1, lock.getQueueLength());
357	<	t2.start();
358	<	Thread.sleep(SHORT_DELAY_MS);
357	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
358	>	waitForQueuedThread(lock, t2);
359		assertEquals(2, lock.getQueueLength());
360		t1.interrupt();
361	<	Thread.sleep(SHORT_DELAY_MS);
361	>	awaitTermination(t1);
362		assertEquals(1, lock.getQueueLength());
363		lock.release();
364	<	Thread.sleep(SHORT_DELAY_MS);
364	>	awaitTermination(t2);
365		assertEquals(0, lock.getQueueLength());
310	–	t1.join();
311	–	t2.join();
366		}
367
368		/**
369		* getQueuedThreads includes waiting threads
370		*/
371	<	public void testGetQueuedThreads() throws InterruptedException {
372	<	final PublicSemaphore lock = new PublicSemaphore(1, false);
373	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
374	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
371	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
372	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
373	>	public void testGetQueuedThreads(boolean fair) {
374	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
375		assertTrue(lock.getQueuedThreads().isEmpty());
376		lock.acquireUninterruptibly();
377		assertTrue(lock.getQueuedThreads().isEmpty());
378	<	t1.start();
379	<	Thread.sleep(SHORT_DELAY_MS);
378	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
379	>	waitForQueuedThread(lock, t1);
380		assertTrue(lock.getQueuedThreads().contains(t1));
381	<	t2.start();
382	<	Thread.sleep(SHORT_DELAY_MS);
381	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
382	>	waitForQueuedThread(lock, t2);
383		assertTrue(lock.getQueuedThreads().contains(t1));
384		assertTrue(lock.getQueuedThreads().contains(t2));
385		t1.interrupt();
386	<	Thread.sleep(SHORT_DELAY_MS);
386	>	awaitTermination(t1);
387		assertFalse(lock.getQueuedThreads().contains(t1));
388		assertTrue(lock.getQueuedThreads().contains(t2));
389		lock.release();
390	<	Thread.sleep(SHORT_DELAY_MS);
390	>	awaitTermination(t2);
391		assertTrue(lock.getQueuedThreads().isEmpty());
338	–	t1.join();
339	–	t2.join();
392		}
393
394		/**
395		* drainPermits reports and removes given number of permits
396		*/
397	<	public void testDrainPermits() {
398	<	Semaphore s = new Semaphore(0, false);
397	>	public void testDrainPermits()      { testDrainPermits(false); }
398	>	public void testDrainPermits_fair() { testDrainPermits(true); }
399	>	public void testDrainPermits(boolean fair) {
400	>	Semaphore s = new Semaphore(0, fair);
401		assertEquals(0, s.availablePermits());
402		assertEquals(0, s.drainPermits());
403		s.release(10);
#	Line 354 | Line 408 | public class SemaphoreTest extends JSR16
408		}
409
410		/**
411	<	* reducePermits reduces number of permits
411	>	* release(-N) throws IllegalArgumentException
412		*/
413	<	public void testReducePermits() {
414	<	PublicSemaphore s = new PublicSemaphore(10, false);
415	<	assertEquals(10, s.availablePermits());
416	<	s.reducePermits(1);
417	<	assertEquals(9, s.availablePermits());
418	<	s.reducePermits(10);
419	<	assertEquals(-1, s.availablePermits());
413	>	public void testReleaseIAE()      { testReleaseIAE(false); }
414	>	public void testReleaseIAE_fair() { testReleaseIAE(true); }
415	>	public void testReleaseIAE(boolean fair) {
416	>	Semaphore s = new Semaphore(10, fair);
417	>	try {
418	>	s.release(-1);
419	>	shouldThrow();
420	>	} catch (IllegalArgumentException success) {}
421		}
422
423		/**
424	<	* a deserialized serialized semaphore has same number of permits
425	<	*/
426	<	public void testSerialization() throws Exception {
427	<	Semaphore l = new Semaphore(3, false);
428	<	l.acquire();
429	<	l.release();
430	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
431	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
432	<	out.writeObject(l);
433	<	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();
424	>	* reducePermits(-N) throws IllegalArgumentException
425	>	*/
426	>	public void testReducePermitsIAE()      { testReducePermitsIAE(false); }
427	>	public void testReducePermitsIAE_fair() { testReducePermitsIAE(true); }
428	>	public void testReducePermitsIAE(boolean fair) {
429	>	PublicSemaphore s = new PublicSemaphore(10, fair);
430	>	try {
431	>	s.reducePermits(-1);
432	>	shouldThrow();
433	>	} catch (IllegalArgumentException success) {}
434		}
435
389	–
436		/**
437	<	* Zero, negative, and positive initial values are allowed in constructor
437	>	* reducePermits reduces number of permits
438		*/
439	<	public void testConstructor_fair() {
440	<	Semaphore s0 = new Semaphore(0, true);
441	<	assertEquals(0, s0.availablePermits());
442	<	assertTrue(s0.isFair());
443	<	Semaphore s1 = new Semaphore(-1, true);
444	<	assertEquals(-1, s1.availablePermits());
445	<	Semaphore s2 = new Semaphore(-1, true);
446	<	assertEquals(-1, s2.availablePermits());
439	>	public void testReducePermits()      { testReducePermits(false); }
440	>	public void testReducePermits_fair() { testReducePermits(true); }
441	>	public void testReducePermits(boolean fair) {
442	>	PublicSemaphore s = new PublicSemaphore(10, fair);
443	>	assertEquals(10, s.availablePermits());
444	>	s.reducePermits(0);
445	>	assertEquals(10, s.availablePermits());
446	>	s.reducePermits(1);
447	>	assertEquals(9, s.availablePermits());
448	>	s.reducePermits(10);
449	>	assertEquals(-1, s.availablePermits());
450	>	s.reducePermits(10);
451	>	assertEquals(-11, s.availablePermits());
452	>	s.reducePermits(0);
453	>	assertEquals(-11, s.availablePermits());
454		}
455
456		/**
457	<	* tryAcquire succeeds when sufficient permits, else fails
458	<	*/
459	<	public void testTryAcquireInSameThread_fair() {
460	<	Semaphore s = new Semaphore(2, true);
461	<	assertEquals(2, s.availablePermits());
462	<	assertTrue(s.tryAcquire());
463	<	assertTrue(s.tryAcquire());
464	<	assertEquals(0, s.availablePermits());
465	<	assertFalse(s.tryAcquire());
457	>	* a reserialized semaphore has same number of permits and
458	>	* fairness, but no queued threads
459	>	*/
460	>	public void testSerialization()      { testSerialization(false); }
461	>	public void testSerialization_fair() { testSerialization(true); }
462	>	public void testSerialization(boolean fair) {
463	>	try {
464	>	Semaphore s = new Semaphore(3, fair);
465	>	s.acquire();
466	>	s.acquire();
467	>	s.release();
468	>
469	>	Semaphore clone = serialClone(s);
470	>	assertEquals(fair, s.isFair());
471	>	assertEquals(fair, clone.isFair());
472	>	assertEquals(2, s.availablePermits());
473	>	assertEquals(2, clone.availablePermits());
474	>	clone.acquire();
475	>	clone.acquire();
476	>	clone.release();
477	>	assertEquals(2, s.availablePermits());
478	>	assertEquals(1, clone.availablePermits());
479	>	assertFalse(s.hasQueuedThreads());
480	>	assertFalse(clone.hasQueuedThreads());
481	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
482	>
483	>	{
484	>	PublicSemaphore s = new PublicSemaphore(0, fair);
485	>	Thread t = newStartedThread(new InterruptibleLockRunnable(s));
486	>	// waitForQueuedThreads(s); // suffers from "flicker", so ...
487	>	waitForQueuedThread(s, t);  // ... we use this instead
488	>	PublicSemaphore clone = serialClone(s);
489	>	assertEquals(fair, s.isFair());
490	>	assertEquals(fair, clone.isFair());
491	>	assertEquals(0, s.availablePermits());
492	>	assertEquals(0, clone.availablePermits());
493	>	assertTrue(s.hasQueuedThreads());
494	>	assertFalse(clone.hasQueuedThreads());
495	>	s.release();
496	>	awaitTermination(t);
497	>	assertFalse(s.hasQueuedThreads());
498	>	assertFalse(clone.hasQueuedThreads());
499	>	}
500		}
501
502		/**
503		* tryAcquire(n) succeeds when sufficient permits, else fails
504		*/
505	<	public void testTryAcquireNInSameThread_fair() {
506	<	Semaphore s = new Semaphore(2, true);
505	>	public void testTryAcquireNInSameThread()      { testTryAcquireNInSameThread(false); }
506	>	public void testTryAcquireNInSameThread_fair() { testTryAcquireNInSameThread(true); }
507	>	public void testTryAcquireNInSameThread(boolean fair) {
508	>	Semaphore s = new Semaphore(2, fair);
509	>	assertEquals(2, s.availablePermits());
510	>	assertFalse(s.tryAcquire(3));
511		assertEquals(2, s.availablePermits());
512		assertTrue(s.tryAcquire(2));
513		assertEquals(0, s.availablePermits());
514	<	assertFalse(s.tryAcquire());
515	<	}
516	<
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());
514	>	assertFalse(s.tryAcquire(1));
515	>	assertFalse(s.tryAcquire(2));
516	>	assertEquals(0, s.availablePermits());
517		}
518
519		/**
520	<	* Acquire(n) and release(n) of semaphore succeed if initially available
520	>	* acquire succeeds if permits available
521		*/
522	<	public void testAcquireReleaseNInSameThread_fair()
523	<	throws InterruptedException {
524	<	Semaphore s = new Semaphore(1, true);
525	<	s.release(1);
526	<	s.acquire(1);
527	<	s.release(2);
528	<	s.acquire(2);
529	<	s.release(3);
530	<	s.acquire(3);
531	<	s.release(4);
532	<	s.acquire(4);
533	<	s.release(5);
534	<	s.acquire(5);
535	<	assertEquals(1, s.availablePermits());
536	<	}
537	<
538	<	/**
539	<	* Acquire(n) and release(n) of semaphore succeed if initially available
540	<	*/
541	<	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
542	<	Semaphore s = new Semaphore(1, true);
543	<	s.release(1);
544	<	s.acquireUninterruptibly(1);
545	<	s.release(2);
546	<	s.acquireUninterruptibly(2);
547	<	s.release(3);
548	<	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());
522	>	public void testReleaseAcquireSameThread_acquire()       { testReleaseAcquireSameThread(false, AcquireMethod.acquire); }
523	>	public void testReleaseAcquireSameThread_acquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquire); }
524	>	public void testReleaseAcquireSameThread_acquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireN); }
525	>	public void testReleaseAcquireSameThread_acquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireN); }
526	>	public void testReleaseAcquireSameThread_acquireUninterruptibly()       { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
527	>	public void testReleaseAcquireSameThread_acquireUninterruptibly_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
528	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
529	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
530	>	public void testReleaseAcquireSameThread_tryAcquire()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquire); }
531	>	public void testReleaseAcquireSameThread_tryAcquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquire); }
532	>	public void testReleaseAcquireSameThread_tryAcquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireN); }
533	>	public void testReleaseAcquireSameThread_tryAcquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireN); }
534	>	public void testReleaseAcquireSameThread_tryAcquireTimed()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimed); }
535	>	public void testReleaseAcquireSameThread_tryAcquireTimed_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimed); }
536	>	public void testReleaseAcquireSameThread_tryAcquireTimedN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimedN); }
537	>	public void testReleaseAcquireSameThread_tryAcquireTimedN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimedN); }
538	>	public void testReleaseAcquireSameThread(boolean fair,
539	>	final AcquireMethod acquirer) {
540	>	Semaphore s = new Semaphore(1, fair);
541	>	for (int i = 1; i < 6; i++) {
542	>	s.release(i);
543	>	assertEquals(1 + i, s.availablePermits());
544	>	try {
545	>	acquirer.acquire(s, i);
546	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
547	>	assertEquals(1, s.availablePermits());
548	>	}
549		}
550
551		/**
552	<	* A release in one thread enables an acquire in another thread
552	>	* release in one thread enables acquire in another thread
553		*/
554	<	public void testAcquireReleaseInDifferentThreads_fair()
555	<	throws InterruptedException {
556	<	final Semaphore s = new Semaphore(0, true);
557	<	Thread t = new Thread(new CheckedRunnable() {
558	<	public void realRun() throws InterruptedException {
559	<	s.acquire();
560	<	s.acquire();
561	<	s.acquire();
562	<	s.acquire();
563	<	}});
564	<
565	<	t.start();
566	<	Thread.sleep(SHORT_DELAY_MS);
567	<	s.release();
568	<	s.release();
569	<	s.release();
570	<	s.release();
571	<	s.release();
572	<	s.release();
573	<	t.join();
574	<	assertEquals(2, s.availablePermits());
554	>	public void testReleaseAcquireDifferentThreads_acquire()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquire); }
555	>	public void testReleaseAcquireDifferentThreads_acquire_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquire); }
556	>	public void testReleaseAcquireDifferentThreads_acquireN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireN); }
557	>	public void testReleaseAcquireDifferentThreads_acquireN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireN); }
558	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
559	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
560	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
561	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
562	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimed); }
563	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimed); }
564	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimedN); }
565	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimedN); }
566	>	public void testReleaseAcquireDifferentThreads(boolean fair,
567	>	final AcquireMethod acquirer) {
568	>	final Semaphore s = new Semaphore(0, fair);
569	>	final int rounds = 4;
570	>	long startTime = System.nanoTime();
571	>	Thread t = newStartedThread(new CheckedRunnable() {
572	>	public void realRun() throws InterruptedException {
573	>	for (int i = 0; i < rounds; i++) {
574	>	assertFalse(s.hasQueuedThreads());
575	>	if (i % 2 == 0)
576	>	acquirer.acquire(s);
577	>	else
578	>	acquirer.acquire(s, 3);
579	>	}}});
580	>
581	>	for (int i = 0; i < rounds; i++) {
582	>	while (! (s.availablePermits() == 0 && s.hasQueuedThreads()))
583	>	Thread.yield();
584	>	assertTrue(t.isAlive());
585	>	if (i % 2 == 0)
586	>	s.release();
587	>	else
588	>	s.release(3);
589	>	}
590	>	awaitTermination(t);
591	>	assertEquals(0, s.availablePermits());
592	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
593		}
594
595		/**
596	<	* release(n) in one thread enables acquire(n) in another thread
596	>	* fair locks are strictly FIFO
597		*/
598	<	public void testAcquireReleaseNInDifferentThreads_fair()
599	<	throws InterruptedException {
600	<	final Semaphore s = new Semaphore(0, true);
601	<	Thread t = new Thread(new CheckedRunnable() {
602	<	public void realRun() throws InterruptedException {
603	<	s.acquire();
604	<	s.release(2);
556	<	s.acquire();
557	<	}});
558	<
559	<	t.start();
560	<	Thread.sleep(SHORT_DELAY_MS);
561	<	s.release(2);
562	<	s.acquire(2);
563	<	s.release(1);
564	<	t.join();
565	<	}
566	<
567	<	/**
568	<	* release(n) in one thread enables acquire(n) in another thread
569	<	*/
570	<	public void testAcquireReleaseNInDifferentThreads_fair2()
571	<	throws InterruptedException {
572	<	final Semaphore s = new Semaphore(0, true);
573	<	Thread t = new Thread(new CheckedRunnable() {
574	<	public void realRun() throws InterruptedException {
575	<	s.acquire(2);
576	<	s.acquire(2);
577	<	s.release(4);
598	>	public void testFairLocksFifo() {
599	>	final PublicSemaphore s = new PublicSemaphore(1, true);
600	>	final CountDownLatch pleaseRelease = new CountDownLatch(1);
601	>	Thread t1 = newStartedThread(new CheckedRunnable() {
602	>	public void realRun() throws InterruptedException {
603	>	// Will block; permits are available, but not three
604	>	s.acquire(3);
605		}});
606
607	<	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	<	}
588	<
589	<
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() {
597	<	public void realRun() throws InterruptedException {
598	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
599	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
600	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
601	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
602	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
603	<	}});
607	>	waitForQueuedThread(s, t1);
608
609	<	t.start();
610	<	s.release();
611	<	s.release();
612	<	s.release();
613	<	s.release();
610	<	s.release();
611	<	t.join();
612	<	}
609	>	Thread t2 = newStartedThread(new CheckedRunnable() {
610	>	public void realRun() throws InterruptedException {
611	>	// Will fail, even though 1 permit is available
612	>	assertFalse(s.tryAcquire(0L, MILLISECONDS));
613	>	assertFalse(s.tryAcquire(1, 0L, MILLISECONDS));
614
615	<	/**
616	<	* 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));
615	>	// untimed tryAcquire will barge and succeed
616	>	assertTrue(s.tryAcquire());
617		s.release(2);
618	<	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
619	<	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	<	}
618	>	assertTrue(s.tryAcquire(2));
619	>	s.release();
620
621	<	/**
622	<	* 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 {
621	>	pleaseRelease.countDown();
622	>	// Will queue up behind t1, even though 1 permit is available
623		s.acquire();
624		}});
625
626	<	t.start();
627	<	Thread.sleep(SHORT_DELAY_MS);
628	<	t.interrupt();
629	<	t.join();
630	<	}
631	<
632	<	/**
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();
626	>	await(pleaseRelease);
627	>	waitForQueuedThread(s, t2);
628	>	s.release(2);
629	>	awaitTermination(t1);
630	>	assertTrue(t2.isAlive());
631	>	s.release();
632	>	awaitTermination(t2);
633		}
634
635		/**
636		* toString indicates current number of permits
637		*/
638	<	public void testToString() {
639	<	Semaphore s = new Semaphore(0);
640	<	String us = s.toString();
641	<	assertTrue(us.indexOf("Permits = 0") >= 0);
642	<	s.release();
760	<	String s1 = s.toString();
761	<	assertTrue(s1.indexOf("Permits = 1") >= 0);
638	>	public void testToString()      { testToString(false); }
639	>	public void testToString_fair() { testToString(true); }
640	>	public void testToString(boolean fair) {
641	>	PublicSemaphore s = new PublicSemaphore(0, fair);
642	>	assertTrue(s.toString().contains("Permits = 0"));
643		s.release();
644	<	String s2 = s.toString();
645	<	assertTrue(s2.indexOf("Permits = 2") >= 0);
644	>	assertTrue(s.toString().contains("Permits = 1"));
645	>	s.release(2);
646	>	assertTrue(s.toString().contains("Permits = 3"));
647	>	s.reducePermits(5);
648	>	assertTrue(s.toString().contains("Permits = -2"));
649		}
650
651		}

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