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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 1.44 by jsr166, Mon Aug 12 06:21:11 2019 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.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 AssertionError("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 AssertionError("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
194	>	* timed tryAcquire times out
195		*/
196	<	public void testAcquireUninterruptiblyReleaseInSameThread()
197	<	throws InterruptedException {
198	<	Semaphore s = new Semaphore(1, false);
199	<	s.acquireUninterruptibly();
200	<	s.release();
201	<	s.acquireUninterruptibly();
202	<	s.release();
203	<	s.acquireUninterruptibly();
204	<	s.release();
205	<	s.acquireUninterruptibly();
206	<	s.release();
207	<	s.acquireUninterruptibly();
208	<	s.release();
209	<	assertEquals(1, s.availablePermits());
210	<	}
196	>	public void testTryAcquire_timeout() throws InterruptedException {
197	>	final boolean fair = randomBoolean();
198	>	final Semaphore s = new Semaphore(0, fair);
199	>	final long startTime = System.nanoTime();
200	>	assertFalse(s.tryAcquire(timeoutMillis(), MILLISECONDS));
201	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
202	>	}
203	>
204	>	/**
205	>	* timed tryAcquire(N) times out
206	>	*/
207	>	public void testTryAcquireN_timeout() throws InterruptedException {
208	>	final boolean fair = randomBoolean();
209	>	final Semaphore s = new Semaphore(2, fair);
210	>	final long startTime = System.nanoTime();
211	>	assertFalse(s.tryAcquire(3, timeoutMillis(), MILLISECONDS));
212	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
213	>	}
214	>
215	>	/**
216	>	* acquire(), acquire(N), timed tryAcquired, timed tryAcquire(N)
217	>	* are interruptible
218	>	*/
219	>	public void testInterruptible_acquire()               { testInterruptible(false, AcquireMethod.acquire); }
220	>	public void testInterruptible_acquire_fair()          { testInterruptible(true,  AcquireMethod.acquire); }
221	>	public void testInterruptible_acquireN()              { testInterruptible(false, AcquireMethod.acquireN); }
222	>	public void testInterruptible_acquireN_fair()         { testInterruptible(true,  AcquireMethod.acquireN); }
223	>	public void testInterruptible_tryAcquireTimed()       { testInterruptible(false, AcquireMethod.tryAcquireTimed); }
224	>	public void testInterruptible_tryAcquireTimed_fair()  { testInterruptible(true,  AcquireMethod.tryAcquireTimed); }
225	>	public void testInterruptible_tryAcquireTimedN()      { testInterruptible(false, AcquireMethod.tryAcquireTimedN); }
226	>	public void testInterruptible_tryAcquireTimedN_fair() { testInterruptible(true,  AcquireMethod.tryAcquireTimedN); }
227	>	public void testInterruptible(boolean fair, final AcquireMethod acquirer) {
228	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
229	>	final java.util.concurrent.CyclicBarrier pleaseInterrupt
230	>	= new java.util.concurrent.CyclicBarrier(2);
231	>	Thread t = newStartedThread(new CheckedRunnable() {
232	>	public void realRun() {
233	>	// Interrupt before acquire
234	>	Thread.currentThread().interrupt();
235	>	try {
236	>	acquirer.acquire(s);
237	>	shouldThrow();
238	>	} catch (InterruptedException success) {}
239	>	assertFalse(Thread.interrupted());
240	>
241	>	// Interrupt before acquire(N)
242	>	Thread.currentThread().interrupt();
243	>	try {
244	>	acquirer.acquire(s, 3);
245	>	shouldThrow();
246	>	} catch (InterruptedException success) {}
247	>	assertFalse(Thread.interrupted());
248	>
249	>	// Interrupt during acquire
250	>	await(pleaseInterrupt);
251	>	try {
252	>	acquirer.acquire(s);
253	>	shouldThrow();
254	>	} catch (InterruptedException success) {}
255	>	assertFalse(Thread.interrupted());
256	>
257	>	// Interrupt during acquire(N)
258	>	await(pleaseInterrupt);
259	>	try {
260	>	acquirer.acquire(s, 3);
261	>	shouldThrow();
262	>	} catch (InterruptedException success) {}
263	>	assertFalse(Thread.interrupted());
264	>	}});
265	>
266	>	for (int n = 2; n-->0; ) {
267	>	await(pleaseInterrupt);
268	>	assertThreadBlocks(t, acquirer.parkedState());
269	>	t.interrupt();
270	>	}
271
272	<	/**
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());
272	>	awaitTermination(t);
273		}
274
275		/**
276	<	* A release in one thread enables an acquire in another thread
276	>	* acquireUninterruptibly(), acquireUninterruptibly(N) are
277	>	* uninterruptible
278		*/
279	<	public void testAcquireReleaseInDifferentThreads()
280	<	throws InterruptedException {
281	<	final Semaphore s = new Semaphore(0, false);
282	<	Thread t = new Thread(new CheckedRunnable() {
283	<	public void realRun() throws InterruptedException {
284	<	s.acquire();
285	<	s.release();
168	<	s.release();
169	<	s.acquire();
170	<	}});
279	>	public void testUninterruptible_acquireUninterruptibly()       { testUninterruptible(false, AcquireMethod.acquireUninterruptibly); }
280	>	public void testUninterruptible_acquireUninterruptibly_fair()  { testUninterruptible(true,  AcquireMethod.acquireUninterruptibly); }
281	>	public void testUninterruptible_acquireUninterruptiblyN()      { testUninterruptible(false, AcquireMethod.acquireUninterruptiblyN); }
282	>	public void testUninterruptible_acquireUninterruptiblyN_fair() { testUninterruptible(true,  AcquireMethod.acquireUninterruptiblyN); }
283	>	public void testUninterruptible(boolean fair, final AcquireMethod acquirer) {
284	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
285	>	final Semaphore pleaseInterrupt = new Semaphore(-1, fair);
286
287	<	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() {
287	>	Thread t1 = newStartedThread(new CheckedRunnable() {
288		public void realRun() throws InterruptedException {
289	<	s.acquireUninterruptibly();
290	<	s.release();
291	<	s.release();
292	<	s.acquireUninterruptibly();
289	>	// Interrupt before acquire
290	>	pleaseInterrupt.release();
291	>	Thread.currentThread().interrupt();
292	>	acquirer.acquire(s);
293	>	assertTrue(Thread.interrupted());
294		}});
295
296	<	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() {
296	>	Thread t2 = newStartedThread(new CheckedRunnable() {
297		public void realRun() throws InterruptedException {
298	<	s.release();
299	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
300	<	s.release();
301	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
298	>	// Interrupt during acquire
299	>	pleaseInterrupt.release();
300	>	acquirer.acquire(s);
301	>	assertTrue(Thread.interrupted());
302		}});
303
304	<	t.start();
305	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
306	<	s.release();
307	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
225	<	s.release();
226	<	s.release();
227	<	t.join();
228	<	}
304	>	await(pleaseInterrupt);
305	>	waitForQueuedThread(s, t1);
306	>	waitForQueuedThread(s, t2);
307	>	t2.interrupt();
308
309	<	/**
310	<	* 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	<	}});
309	>	assertThreadBlocks(t1, Thread.State.WAITING);
310	>	assertThreadBlocks(t2, Thread.State.WAITING);
311
312	<	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	<	}});
312	>	s.release(2);
313
314	<	t.start();
315	<	Thread.sleep(SHORT_DELAY_MS);
260	<	t.interrupt();
261	<	t.join();
314	>	awaitTermination(t1);
315	>	awaitTermination(t2);
316		}
317
318		/**
319		* hasQueuedThreads reports whether there are waiting threads
320		*/
321	<	public void testHasQueuedThreads() throws InterruptedException {
322	<	final Semaphore lock = new Semaphore(1, false);
323	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
324	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
321	>	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
322	>	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
323	>	public void testHasQueuedThreads(boolean fair) {
324	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
325		assertFalse(lock.hasQueuedThreads());
326		lock.acquireUninterruptibly();
327	<	t1.start();
328	<	Thread.sleep(SHORT_DELAY_MS);
327	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
328	>	waitForQueuedThread(lock, t1);
329		assertTrue(lock.hasQueuedThreads());
330	<	t2.start();
331	<	Thread.sleep(SHORT_DELAY_MS);
330	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
331	>	waitForQueuedThread(lock, t2);
332		assertTrue(lock.hasQueuedThreads());
333		t1.interrupt();
334	<	Thread.sleep(SHORT_DELAY_MS);
334	>	awaitTermination(t1);
335		assertTrue(lock.hasQueuedThreads());
336		lock.release();
337	<	Thread.sleep(SHORT_DELAY_MS);
337	>	awaitTermination(t2);
338		assertFalse(lock.hasQueuedThreads());
285	–	t1.join();
286	–	t2.join();
339		}
340
341		/**
342		* getQueueLength reports number of waiting threads
343		*/
344	<	public void testGetQueueLength() throws InterruptedException {
345	<	final Semaphore lock = new Semaphore(1, false);
346	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
347	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
344	>	public void testGetQueueLength()      { testGetQueueLength(false); }
345	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
346	>	public void testGetQueueLength(boolean fair) {
347	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
348		assertEquals(0, lock.getQueueLength());
349		lock.acquireUninterruptibly();
350	<	t1.start();
351	<	Thread.sleep(SHORT_DELAY_MS);
350	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
351	>	waitForQueuedThread(lock, t1);
352		assertEquals(1, lock.getQueueLength());
353	<	t2.start();
354	<	Thread.sleep(SHORT_DELAY_MS);
353	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
354	>	waitForQueuedThread(lock, t2);
355		assertEquals(2, lock.getQueueLength());
356		t1.interrupt();
357	<	Thread.sleep(SHORT_DELAY_MS);
357	>	awaitTermination(t1);
358		assertEquals(1, lock.getQueueLength());
359		lock.release();
360	<	Thread.sleep(SHORT_DELAY_MS);
360	>	awaitTermination(t2);
361		assertEquals(0, lock.getQueueLength());
310	–	t1.join();
311	–	t2.join();
362		}
363
364		/**
365		* getQueuedThreads includes waiting threads
366		*/
367	<	public void testGetQueuedThreads() throws InterruptedException {
368	<	final PublicSemaphore lock = new PublicSemaphore(1, false);
369	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
370	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
367	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
368	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
369	>	public void testGetQueuedThreads(boolean fair) {
370	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
371		assertTrue(lock.getQueuedThreads().isEmpty());
372		lock.acquireUninterruptibly();
373		assertTrue(lock.getQueuedThreads().isEmpty());
374	<	t1.start();
375	<	Thread.sleep(SHORT_DELAY_MS);
374	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
375	>	waitForQueuedThread(lock, t1);
376		assertTrue(lock.getQueuedThreads().contains(t1));
377	<	t2.start();
378	<	Thread.sleep(SHORT_DELAY_MS);
377	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
378	>	waitForQueuedThread(lock, t2);
379		assertTrue(lock.getQueuedThreads().contains(t1));
380		assertTrue(lock.getQueuedThreads().contains(t2));
381		t1.interrupt();
382	<	Thread.sleep(SHORT_DELAY_MS);
382	>	awaitTermination(t1);
383		assertFalse(lock.getQueuedThreads().contains(t1));
384		assertTrue(lock.getQueuedThreads().contains(t2));
385		lock.release();
386	<	Thread.sleep(SHORT_DELAY_MS);
386	>	awaitTermination(t2);
387		assertTrue(lock.getQueuedThreads().isEmpty());
338	–	t1.join();
339	–	t2.join();
388		}
389
390		/**
391		* drainPermits reports and removes given number of permits
392		*/
393	<	public void testDrainPermits() {
394	<	Semaphore s = new Semaphore(0, false);
393	>	public void testDrainPermits()      { testDrainPermits(false); }
394	>	public void testDrainPermits_fair() { testDrainPermits(true); }
395	>	public void testDrainPermits(boolean fair) {
396	>	Semaphore s = new Semaphore(0, fair);
397		assertEquals(0, s.availablePermits());
398		assertEquals(0, s.drainPermits());
399		s.release(10);
#	Line 354 | Line 404 | public class SemaphoreTest extends JSR16
404		}
405
406		/**
407	<	* reducePermits reduces number of permits
407	>	* release(-N) throws IllegalArgumentException
408		*/
409	<	public void testReducePermits() {
410	<	PublicSemaphore s = new PublicSemaphore(10, false);
411	<	assertEquals(10, s.availablePermits());
412	<	s.reducePermits(1);
413	<	assertEquals(9, s.availablePermits());
414	<	s.reducePermits(10);
415	<	assertEquals(-1, s.availablePermits());
409	>	public void testReleaseIAE()      { testReleaseIAE(false); }
410	>	public void testReleaseIAE_fair() { testReleaseIAE(true); }
411	>	public void testReleaseIAE(boolean fair) {
412	>	Semaphore s = new Semaphore(10, fair);
413	>	try {
414	>	s.release(-1);
415	>	shouldThrow();
416	>	} catch (IllegalArgumentException success) {}
417		}
418
419		/**
420	<	* a deserialized serialized semaphore has same number of permits
421	<	*/
422	<	public void testSerialization() throws Exception {
423	<	Semaphore l = new Semaphore(3, false);
424	<	l.acquire();
425	<	l.release();
426	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
427	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
428	<	out.writeObject(l);
429	<	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();
420	>	* reducePermits(-N) throws IllegalArgumentException
421	>	*/
422	>	public void testReducePermitsIAE()      { testReducePermitsIAE(false); }
423	>	public void testReducePermitsIAE_fair() { testReducePermitsIAE(true); }
424	>	public void testReducePermitsIAE(boolean fair) {
425	>	PublicSemaphore s = new PublicSemaphore(10, fair);
426	>	try {
427	>	s.reducePermits(-1);
428	>	shouldThrow();
429	>	} catch (IllegalArgumentException success) {}
430		}
431
389	–
432		/**
433	<	* Zero, negative, and positive initial values are allowed in constructor
433	>	* reducePermits reduces number of permits
434		*/
435	<	public void testConstructor_fair() {
436	<	Semaphore s0 = new Semaphore(0, true);
437	<	assertEquals(0, s0.availablePermits());
438	<	assertTrue(s0.isFair());
439	<	Semaphore s1 = new Semaphore(-1, true);
440	<	assertEquals(-1, s1.availablePermits());
441	<	Semaphore s2 = new Semaphore(-1, true);
442	<	assertEquals(-1, s2.availablePermits());
435	>	public void testReducePermits()      { testReducePermits(false); }
436	>	public void testReducePermits_fair() { testReducePermits(true); }
437	>	public void testReducePermits(boolean fair) {
438	>	PublicSemaphore s = new PublicSemaphore(10, fair);
439	>	assertEquals(10, s.availablePermits());
440	>	s.reducePermits(0);
441	>	assertEquals(10, s.availablePermits());
442	>	s.reducePermits(1);
443	>	assertEquals(9, s.availablePermits());
444	>	s.reducePermits(10);
445	>	assertEquals(-1, s.availablePermits());
446	>	s.reducePermits(10);
447	>	assertEquals(-11, s.availablePermits());
448	>	s.reducePermits(0);
449	>	assertEquals(-11, s.availablePermits());
450		}
451
452		/**
453	<	* tryAcquire succeeds when sufficient permits, else fails
454	<	*/
455	<	public void testTryAcquireInSameThread_fair() {
456	<	Semaphore s = new Semaphore(2, true);
457	<	assertEquals(2, s.availablePermits());
458	<	assertTrue(s.tryAcquire());
459	<	assertTrue(s.tryAcquire());
460	<	assertEquals(0, s.availablePermits());
461	<	assertFalse(s.tryAcquire());
453	>	* a reserialized semaphore has same number of permits and
454	>	* fairness, but no queued threads
455	>	*/
456	>	public void testSerialization()      { testSerialization(false); }
457	>	public void testSerialization_fair() { testSerialization(true); }
458	>	public void testSerialization(boolean fair) {
459	>	try {
460	>	Semaphore s = new Semaphore(3, fair);
461	>	s.acquire();
462	>	s.acquire();
463	>	s.release();
464	>
465	>	Semaphore clone = serialClone(s);
466	>	assertEquals(fair, s.isFair());
467	>	assertEquals(fair, clone.isFair());
468	>	assertEquals(2, s.availablePermits());
469	>	assertEquals(2, clone.availablePermits());
470	>	clone.acquire();
471	>	clone.acquire();
472	>	clone.release();
473	>	assertEquals(2, s.availablePermits());
474	>	assertEquals(1, clone.availablePermits());
475	>	assertFalse(s.hasQueuedThreads());
476	>	assertFalse(clone.hasQueuedThreads());
477	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
478	>
479	>	{
480	>	PublicSemaphore s = new PublicSemaphore(0, fair);
481	>	Thread t = newStartedThread(new InterruptibleLockRunnable(s));
482	>	// waitForQueuedThreads(s); // suffers from "flicker", so ...
483	>	waitForQueuedThread(s, t);  // ... we use this instead
484	>	PublicSemaphore clone = serialClone(s);
485	>	assertEquals(fair, s.isFair());
486	>	assertEquals(fair, clone.isFair());
487	>	assertEquals(0, s.availablePermits());
488	>	assertEquals(0, clone.availablePermits());
489	>	assertTrue(s.hasQueuedThreads());
490	>	assertFalse(clone.hasQueuedThreads());
491	>	s.release();
492	>	awaitTermination(t);
493	>	assertFalse(s.hasQueuedThreads());
494	>	assertFalse(clone.hasQueuedThreads());
495	>	}
496		}
497
498		/**
499		* tryAcquire(n) succeeds when sufficient permits, else fails
500		*/
501	<	public void testTryAcquireNInSameThread_fair() {
502	<	Semaphore s = new Semaphore(2, true);
501	>	public void testTryAcquireNInSameThread()      { testTryAcquireNInSameThread(false); }
502	>	public void testTryAcquireNInSameThread_fair() { testTryAcquireNInSameThread(true); }
503	>	public void testTryAcquireNInSameThread(boolean fair) {
504	>	Semaphore s = new Semaphore(2, fair);
505	>	assertEquals(2, s.availablePermits());
506	>	assertFalse(s.tryAcquire(3));
507		assertEquals(2, s.availablePermits());
508		assertTrue(s.tryAcquire(2));
509		assertEquals(0, s.availablePermits());
510	<	assertFalse(s.tryAcquire());
511	<	}
512	<
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());
510	>	assertFalse(s.tryAcquire(1));
511	>	assertFalse(s.tryAcquire(2));
512	>	assertEquals(0, s.availablePermits());
513		}
514
515		/**
516	<	* Acquire(n) and release(n) of semaphore succeed if initially available
516	>	* acquire succeeds if permits available
517		*/
518	<	public void testAcquireReleaseNInSameThread_fair()
519	<	throws InterruptedException {
520	<	Semaphore s = new Semaphore(1, true);
521	<	s.release(1);
522	<	s.acquire(1);
523	<	s.release(2);
524	<	s.acquire(2);
525	<	s.release(3);
526	<	s.acquire(3);
527	<	s.release(4);
528	<	s.acquire(4);
529	<	s.release(5);
530	<	s.acquire(5);
531	<	assertEquals(1, s.availablePermits());
532	<	}
533	<
534	<	/**
535	<	* Acquire(n) and release(n) of semaphore succeed if initially available
536	<	*/
537	<	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
538	<	Semaphore s = new Semaphore(1, true);
539	<	s.release(1);
540	<	s.acquireUninterruptibly(1);
541	<	s.release(2);
542	<	s.acquireUninterruptibly(2);
543	<	s.release(3);
544	<	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());
518	>	public void testReleaseAcquireSameThread_acquire()       { testReleaseAcquireSameThread(false, AcquireMethod.acquire); }
519	>	public void testReleaseAcquireSameThread_acquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquire); }
520	>	public void testReleaseAcquireSameThread_acquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireN); }
521	>	public void testReleaseAcquireSameThread_acquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireN); }
522	>	public void testReleaseAcquireSameThread_acquireUninterruptibly()       { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
523	>	public void testReleaseAcquireSameThread_acquireUninterruptibly_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
524	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
525	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
526	>	public void testReleaseAcquireSameThread_tryAcquire()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquire); }
527	>	public void testReleaseAcquireSameThread_tryAcquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquire); }
528	>	public void testReleaseAcquireSameThread_tryAcquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireN); }
529	>	public void testReleaseAcquireSameThread_tryAcquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireN); }
530	>	public void testReleaseAcquireSameThread_tryAcquireTimed()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimed); }
531	>	public void testReleaseAcquireSameThread_tryAcquireTimed_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimed); }
532	>	public void testReleaseAcquireSameThread_tryAcquireTimedN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimedN); }
533	>	public void testReleaseAcquireSameThread_tryAcquireTimedN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimedN); }
534	>	public void testReleaseAcquireSameThread(boolean fair,
535	>	final AcquireMethod acquirer) {
536	>	Semaphore s = new Semaphore(1, fair);
537	>	for (int i = 1; i < 6; i++) {
538	>	s.release(i);
539	>	assertEquals(1 + i, s.availablePermits());
540	>	try {
541	>	acquirer.acquire(s, i);
542	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
543	>	assertEquals(1, s.availablePermits());
544	>	}
545		}
546
547		/**
548	<	* A release in one thread enables an acquire in another thread
548	>	* release in one thread enables acquire in another thread
549		*/
550	<	public void testAcquireReleaseInDifferentThreads_fair()
551	<	throws InterruptedException {
552	<	final Semaphore s = new Semaphore(0, true);
553	<	Thread t = new Thread(new CheckedRunnable() {
554	<	public void realRun() throws InterruptedException {
555	<	s.acquire();
556	<	s.acquire();
557	<	s.acquire();
558	<	s.acquire();
559	<	}});
560	<
561	<	t.start();
562	<	Thread.sleep(SHORT_DELAY_MS);
563	<	s.release();
564	<	s.release();
565	<	s.release();
566	<	s.release();
567	<	s.release();
568	<	s.release();
569	<	t.join();
570	<	assertEquals(2, s.availablePermits());
550	>	public void testReleaseAcquireDifferentThreads_acquire()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquire); }
551	>	public void testReleaseAcquireDifferentThreads_acquire_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquire); }
552	>	public void testReleaseAcquireDifferentThreads_acquireN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireN); }
553	>	public void testReleaseAcquireDifferentThreads_acquireN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireN); }
554	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
555	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
556	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
557	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
558	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimed); }
559	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimed); }
560	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimedN); }
561	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimedN); }
562	>	public void testReleaseAcquireDifferentThreads(boolean fair,
563	>	final AcquireMethod acquirer) {
564	>	final Semaphore s = new Semaphore(0, fair);
565	>	final int rounds = 4;
566	>	long startTime = System.nanoTime();
567	>	Thread t = newStartedThread(new CheckedRunnable() {
568	>	public void realRun() throws InterruptedException {
569	>	for (int i = 0; i < rounds; i++) {
570	>	assertFalse(s.hasQueuedThreads());
571	>	if (i % 2 == 0)
572	>	acquirer.acquire(s);
573	>	else
574	>	acquirer.acquire(s, 3);
575	>	}}});
576	>
577	>	for (int i = 0; i < rounds; i++) {
578	>	while (! (s.availablePermits() == 0 && s.hasQueuedThreads()))
579	>	Thread.yield();
580	>	assertTrue(t.isAlive());
581	>	if (i % 2 == 0)
582	>	s.release();
583	>	else
584	>	s.release(3);
585	>	}
586	>	awaitTermination(t);
587	>	assertEquals(0, s.availablePermits());
588	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
589		}
590
591		/**
592	<	* release(n) in one thread enables acquire(n) in another thread
592	>	* fair locks are strictly FIFO
593		*/
594	<	public void testAcquireReleaseNInDifferentThreads_fair()
595	<	throws InterruptedException {
596	<	final Semaphore s = new Semaphore(0, true);
597	<	Thread t = new Thread(new CheckedRunnable() {
598	<	public void realRun() throws InterruptedException {
599	<	s.acquire();
600	<	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);
594	>	public void testFairLocksFifo() {
595	>	final PublicSemaphore s = new PublicSemaphore(1, true);
596	>	final CountDownLatch pleaseRelease = new CountDownLatch(1);
597	>	Thread t1 = newStartedThread(new CheckedRunnable() {
598	>	public void realRun() throws InterruptedException {
599	>	// Will block; permits are available, but not three
600	>	s.acquire(3);
601		}});
602
603	<	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	<	}});
603	>	waitForQueuedThread(s, t1);
604
605	<	t.start();
606	<	s.release();
607	<	s.release();
608	<	s.release();
609	<	s.release();
610	<	s.release();
611	<	t.join();
612	<	}
605	>	Thread t2 = newStartedThread(new CheckedRunnable() {
606	>	public void realRun() throws InterruptedException {
607	>	// Will fail, even though 1 permit is available
608	>	assertFalse(
609	>	s.tryAcquire(randomExpiredTimeout(), randomTimeUnit()));
610	>	assertFalse(
611	>	s.tryAcquire(1, randomExpiredTimeout(), randomTimeUnit()));
612
613	<	/**
614	<	* 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));
613	>	// untimed tryAcquire will barge and succeed
614	>	assertTrue(s.tryAcquire());
615		s.release(2);
616	<	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
617	<	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	<	}
616	>	assertTrue(s.tryAcquire(2));
617	>	s.release();
618
619	<	/**
620	<	* 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 {
619	>	pleaseRelease.countDown();
620	>	// Will queue up behind t1, even though 1 permit is available
621		s.acquire();
622		}});
623
624	<	t.start();
625	<	Thread.sleep(SHORT_DELAY_MS);
626	<	t.interrupt();
627	<	t.join();
628	<	}
629	<
630	<	/**
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();
624	>	await(pleaseRelease);
625	>	waitForQueuedThread(s, t2);
626	>	s.release(2);
627	>	awaitTermination(t1);
628	>	assertTrue(t2.isAlive());
629	>	s.release();
630	>	awaitTermination(t2);
631		}
632
633		/**
634		* toString indicates current number of permits
635		*/
636	<	public void testToString() {
637	<	Semaphore s = new Semaphore(0);
638	<	String us = s.toString();
639	<	assertTrue(us.indexOf("Permits = 0") >= 0);
640	<	s.release();
760	<	String s1 = s.toString();
761	<	assertTrue(s1.indexOf("Permits = 1") >= 0);
636	>	public void testToString()      { testToString(false); }
637	>	public void testToString_fair() { testToString(true); }
638	>	public void testToString(boolean fair) {
639	>	PublicSemaphore s = new PublicSemaphore(0, fair);
640	>	assertTrue(s.toString().contains("Permits = 0"));
641		s.release();
642	<	String s2 = s.toString();
643	<	assertTrue(s2.indexOf("Permits = 2") >= 0);
642	>	assertTrue(s.toString().contains("Permits = 1"));
643	>	s.release(2);
644	>	assertTrue(s.toString().contains("Permits = 3"));
645	>	s.reducePermits(5);
646	>	assertTrue(s.toString().contains("Permits = -2"));
647		}
648
649		}

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