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

Comparing jsr166/src/test/tck/SemaphoreTest.java (file contents):
Revision 1.21 by jsr166, Sat Nov 21 17:38:05 2009 UTC vs.
Revision 1.43 by jsr166, Tue Jan 23 20:44:11 2018 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);
#	Line 24 | Line 28 | public class SemaphoreTest extends JSR16
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 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	<	public void testConstructor() {
73	<	for (int permits : new int[] { -1, 0, 1 }) {
74	<	for (boolean fair : new boolean[] { false, true }) {
75	<	Semaphore s = new Semaphore(permits, fair);
76	<	assertEquals(permits, s.availablePermits());
77	<	assertEquals(fair, s.isFair());
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	>	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 86 | 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
194	>	* timed tryAcquire times out
195		*/
196	<	public void testAcquireReleaseInSameThread()
197	<	throws InterruptedException {
198	<	Semaphore s = new Semaphore(1, false);
199	<	s.acquire();
200	<	s.release();
201	<	s.acquire();
202	<	s.release();
203	<	s.acquire();
204	<	s.release();
205	<	s.acquire();
206	<	s.release();
207	<	s.acquire();
208	<	s.release();
209	<	assertEquals(1, s.availablePermits());
210	<	}
196	>	public void testTryAcquire_timeout() {
197	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
198	>	final Semaphore s = new Semaphore(0, fair);
199	>	final long startTime = System.nanoTime();
200	>	try { assertFalse(s.tryAcquire(timeoutMillis(), MILLISECONDS)); }
201	>	catch (InterruptedException e) { threadUnexpectedException(e); }
202	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
203	>	}
204	>
205	>	/**
206	>	* timed tryAcquire(N) times out
207	>	*/
208	>	public void testTryAcquireN_timeout() {
209	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
210	>	final Semaphore s = new Semaphore(2, fair);
211	>	final long startTime = System.nanoTime();
212	>	try { assertFalse(s.tryAcquire(3, timeoutMillis(), MILLISECONDS)); }
213	>	catch (InterruptedException e) { threadUnexpectedException(e); }
214	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
215	>	}
216	>
217	>	/**
218	>	* acquire(), acquire(N), timed tryAcquired, timed tryAcquire(N)
219	>	* are interruptible
220	>	*/
221	>	public void testInterruptible_acquire()               { testInterruptible(false, AcquireMethod.acquire); }
222	>	public void testInterruptible_acquire_fair()          { testInterruptible(true,  AcquireMethod.acquire); }
223	>	public void testInterruptible_acquireN()              { testInterruptible(false, AcquireMethod.acquireN); }
224	>	public void testInterruptible_acquireN_fair()         { testInterruptible(true,  AcquireMethod.acquireN); }
225	>	public void testInterruptible_tryAcquireTimed()       { testInterruptible(false, AcquireMethod.tryAcquireTimed); }
226	>	public void testInterruptible_tryAcquireTimed_fair()  { testInterruptible(true,  AcquireMethod.tryAcquireTimed); }
227	>	public void testInterruptible_tryAcquireTimedN()      { testInterruptible(false, AcquireMethod.tryAcquireTimedN); }
228	>	public void testInterruptible_tryAcquireTimedN_fair() { testInterruptible(true,  AcquireMethod.tryAcquireTimedN); }
229	>	public void testInterruptible(boolean fair, final AcquireMethod acquirer) {
230	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
231	>	final java.util.concurrent.CyclicBarrier pleaseInterrupt
232	>	= new java.util.concurrent.CyclicBarrier(2);
233	>	Thread t = newStartedThread(new CheckedRunnable() {
234	>	public void realRun() {
235	>	// Interrupt before acquire
236	>	Thread.currentThread().interrupt();
237	>	try {
238	>	acquirer.acquire(s);
239	>	shouldThrow();
240	>	} catch (InterruptedException success) {}
241	>	assertFalse(Thread.interrupted());
242	>
243	>	// Interrupt before acquire(N)
244	>	Thread.currentThread().interrupt();
245	>	try {
246	>	acquirer.acquire(s, 3);
247	>	shouldThrow();
248	>	} catch (InterruptedException success) {}
249	>	assertFalse(Thread.interrupted());
250	>
251	>	// Interrupt during acquire
252	>	await(pleaseInterrupt);
253	>	try {
254	>	acquirer.acquire(s);
255	>	shouldThrow();
256	>	} catch (InterruptedException success) {}
257	>	assertFalse(Thread.interrupted());
258	>
259	>	// Interrupt during acquire(N)
260	>	await(pleaseInterrupt);
261	>	try {
262	>	acquirer.acquire(s, 3);
263	>	shouldThrow();
264	>	} catch (InterruptedException success) {}
265	>	assertFalse(Thread.interrupted());
266	>	}});
267	>
268	>	for (int n = 2; n-->0; ) {
269	>	await(pleaseInterrupt);
270	>	assertThreadBlocks(t, acquirer.parkedState());
271	>	t.interrupt();
272	>	}
273
274	<	/**
118	<	* Uninterruptible acquire and release of semaphore succeed if
119	<	* initially available
120	<	*/
121	<	public void testAcquireUninterruptiblyReleaseInSameThread()
122	<	throws InterruptedException {
123	<	Semaphore s = new Semaphore(1, false);
124	<	s.acquireUninterruptibly();
125	<	s.release();
126	<	s.acquireUninterruptibly();
127	<	s.release();
128	<	s.acquireUninterruptibly();
129	<	s.release();
130	<	s.acquireUninterruptibly();
131	<	s.release();
132	<	s.acquireUninterruptibly();
133	<	s.release();
134	<	assertEquals(1, s.availablePermits());
274	>	awaitTermination(t);
275		}
276
277		/**
278	<	* Timed Acquire and release of semaphore succeed if
279	<	* initially available
278	>	* acquireUninterruptibly(), acquireUninterruptibly(N) are
279	>	* uninterruptible
280		*/
281	<	public void testTimedAcquireReleaseInSameThread()
282	<	throws InterruptedException {
283	<	Semaphore s = new Semaphore(1, false);
284	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
285	<	s.release();
286	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
287	<	s.release();
148	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
149	<	s.release();
150	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
151	<	s.release();
152	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
153	<	s.release();
154	<	assertEquals(1, s.availablePermits());
155	<	}
281	>	public void testUninterruptible_acquireUninterruptibly()       { testUninterruptible(false, AcquireMethod.acquireUninterruptibly); }
282	>	public void testUninterruptible_acquireUninterruptibly_fair()  { testUninterruptible(true,  AcquireMethod.acquireUninterruptibly); }
283	>	public void testUninterruptible_acquireUninterruptiblyN()      { testUninterruptible(false, AcquireMethod.acquireUninterruptiblyN); }
284	>	public void testUninterruptible_acquireUninterruptiblyN_fair() { testUninterruptible(true,  AcquireMethod.acquireUninterruptiblyN); }
285	>	public void testUninterruptible(boolean fair, final AcquireMethod acquirer) {
286	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
287	>	final Semaphore pleaseInterrupt = new Semaphore(-1, fair);
288
289	<	/**
158	<	* A release in one thread enables an acquire in another thread
159	<	*/
160	<	public void testAcquireReleaseInDifferentThreads()
161	<	throws InterruptedException {
162	<	final Semaphore s = new Semaphore(0, false);
163	<	Thread t = new Thread(new CheckedRunnable() {
289	>	Thread t1 = newStartedThread(new CheckedRunnable() {
290		public void realRun() throws InterruptedException {
291	<	s.acquire();
292	<	s.release();
293	<	s.release();
294	<	s.acquire();
291	>	// Interrupt before acquire
292	>	pleaseInterrupt.release();
293	>	Thread.currentThread().interrupt();
294	>	acquirer.acquire(s);
295	>	assertTrue(Thread.interrupted());
296		}});
297
298	<	t.start();
172	<	Thread.sleep(SHORT_DELAY_MS);
173	<	s.release();
174	<	s.release();
175	<	s.acquire();
176	<	s.acquire();
177	<	s.release();
178	<	t.join();
179	<	}
180	<
181	<	/**
182	<	* A release in one thread enables an uninterruptible acquire in another thread
183	<	*/
184	<	public void testUninterruptibleAcquireReleaseInDifferentThreads()
185	<	throws InterruptedException {
186	<	final Semaphore s = new Semaphore(0, false);
187	<	Thread t = new Thread(new CheckedRunnable() {
188	<	public void realRun() throws InterruptedException {
189	<	s.acquireUninterruptibly();
190	<	s.release();
191	<	s.release();
192	<	s.acquireUninterruptibly();
193	<	}});
194	<
195	<	t.start();
196	<	Thread.sleep(SHORT_DELAY_MS);
197	<	s.release();
198	<	s.release();
199	<	s.acquireUninterruptibly();
200	<	s.acquireUninterruptibly();
201	<	s.release();
202	<	t.join();
203	<	}
204	<
205	<
206	<	/**
207	<	*  A release in one thread enables a timed acquire in another thread
208	<	*/
209	<	public void testTimedAcquireReleaseInDifferentThreads()
210	<	throws InterruptedException {
211	<	final Semaphore s = new Semaphore(1, false);
212	<	Thread t = new Thread(new CheckedRunnable() {
298	>	Thread t2 = newStartedThread(new CheckedRunnable() {
299		public void realRun() throws InterruptedException {
300	<	s.release();
301	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
302	<	s.release();
303	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
300	>	// Interrupt during acquire
301	>	pleaseInterrupt.release();
302	>	acquirer.acquire(s);
303	>	assertTrue(Thread.interrupted());
304		}});
305
306	<	t.start();
307	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
308	<	s.release();
309	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
224	<	s.release();
225	<	s.release();
226	<	t.join();
227	<	}
228	<
229	<	/**
230	<	* A waiting acquire blocks interruptibly
231	<	*/
232	<	public void testAcquire_InterruptedException()
233	<	throws InterruptedException {
234	<	final Semaphore s = new Semaphore(0, false);
235	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
236	<	public void realRun() throws InterruptedException {
237	<	s.acquire();
238	<	}});
306	>	await(pleaseInterrupt);
307	>	waitForQueuedThread(s, t1);
308	>	waitForQueuedThread(s, t2);
309	>	t2.interrupt();
310
311	<	t.start();
312	<	Thread.sleep(SHORT_DELAY_MS);
242	<	t.interrupt();
243	<	t.join();
244	<	}
311	>	assertThreadBlocks(t1, Thread.State.WAITING);
312	>	assertThreadBlocks(t2, Thread.State.WAITING);
313
314	<	/**
247	<	*  A waiting timed acquire blocks interruptibly
248	<	*/
249	<	public void testTryAcquire_InterruptedException()
250	<	throws InterruptedException {
251	<	final Semaphore s = new Semaphore(0, false);
252	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
253	<	public void realRun() throws InterruptedException {
254	<	s.tryAcquire(MEDIUM_DELAY_MS, MILLISECONDS);
255	<	}});
314	>	s.release(2);
315
316	<	t.start();
317	<	Thread.sleep(SHORT_DELAY_MS);
259	<	t.interrupt();
260	<	t.join();
316	>	awaitTermination(t1);
317	>	awaitTermination(t2);
318		}
319
320		/**
321		* hasQueuedThreads reports whether there are waiting threads
322		*/
323	<	public void testHasQueuedThreads() throws InterruptedException {
324	<	final Semaphore lock = new Semaphore(1, false);
325	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
326	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
323	>	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
324	>	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
325	>	public void testHasQueuedThreads(boolean fair) {
326	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
327		assertFalse(lock.hasQueuedThreads());
328		lock.acquireUninterruptibly();
329	<	t1.start();
330	<	Thread.sleep(SHORT_DELAY_MS);
329	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
330	>	waitForQueuedThread(lock, t1);
331		assertTrue(lock.hasQueuedThreads());
332	<	t2.start();
333	<	Thread.sleep(SHORT_DELAY_MS);
332	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
333	>	waitForQueuedThread(lock, t2);
334		assertTrue(lock.hasQueuedThreads());
335		t1.interrupt();
336	<	Thread.sleep(SHORT_DELAY_MS);
336	>	awaitTermination(t1);
337		assertTrue(lock.hasQueuedThreads());
338		lock.release();
339	<	Thread.sleep(SHORT_DELAY_MS);
339	>	awaitTermination(t2);
340		assertFalse(lock.hasQueuedThreads());
284	–	t1.join();
285	–	t2.join();
341		}
342
343		/**
344		* getQueueLength reports number of waiting threads
345		*/
346	<	public void testGetQueueLength() throws InterruptedException {
347	<	final Semaphore lock = new Semaphore(1, false);
348	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
349	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
346	>	public void testGetQueueLength()      { testGetQueueLength(false); }
347	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
348	>	public void testGetQueueLength(boolean fair) {
349	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
350		assertEquals(0, lock.getQueueLength());
351		lock.acquireUninterruptibly();
352	<	t1.start();
353	<	Thread.sleep(SHORT_DELAY_MS);
352	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
353	>	waitForQueuedThread(lock, t1);
354		assertEquals(1, lock.getQueueLength());
355	<	t2.start();
356	<	Thread.sleep(SHORT_DELAY_MS);
355	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
356	>	waitForQueuedThread(lock, t2);
357		assertEquals(2, lock.getQueueLength());
358		t1.interrupt();
359	<	Thread.sleep(SHORT_DELAY_MS);
359	>	awaitTermination(t1);
360		assertEquals(1, lock.getQueueLength());
361		lock.release();
362	<	Thread.sleep(SHORT_DELAY_MS);
362	>	awaitTermination(t2);
363		assertEquals(0, lock.getQueueLength());
309	–	t1.join();
310	–	t2.join();
364		}
365
366		/**
367		* getQueuedThreads includes waiting threads
368		*/
369	<	public void testGetQueuedThreads() throws InterruptedException {
370	<	final PublicSemaphore lock = new PublicSemaphore(1, false);
371	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
372	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
369	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
370	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
371	>	public void testGetQueuedThreads(boolean fair) {
372	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
373		assertTrue(lock.getQueuedThreads().isEmpty());
374		lock.acquireUninterruptibly();
375		assertTrue(lock.getQueuedThreads().isEmpty());
376	<	t1.start();
377	<	Thread.sleep(SHORT_DELAY_MS);
376	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
377	>	waitForQueuedThread(lock, t1);
378		assertTrue(lock.getQueuedThreads().contains(t1));
379	<	t2.start();
380	<	Thread.sleep(SHORT_DELAY_MS);
379	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
380	>	waitForQueuedThread(lock, t2);
381		assertTrue(lock.getQueuedThreads().contains(t1));
382		assertTrue(lock.getQueuedThreads().contains(t2));
383		t1.interrupt();
384	<	Thread.sleep(SHORT_DELAY_MS);
384	>	awaitTermination(t1);
385		assertFalse(lock.getQueuedThreads().contains(t1));
386		assertTrue(lock.getQueuedThreads().contains(t2));
387		lock.release();
388	<	Thread.sleep(SHORT_DELAY_MS);
388	>	awaitTermination(t2);
389		assertTrue(lock.getQueuedThreads().isEmpty());
337	–	t1.join();
338	–	t2.join();
390		}
391
392		/**
393		* drainPermits reports and removes given number of permits
394		*/
395	<	public void testDrainPermits() {
396	<	Semaphore s = new Semaphore(0, false);
395	>	public void testDrainPermits()      { testDrainPermits(false); }
396	>	public void testDrainPermits_fair() { testDrainPermits(true); }
397	>	public void testDrainPermits(boolean fair) {
398	>	Semaphore s = new Semaphore(0, fair);
399		assertEquals(0, s.availablePermits());
400		assertEquals(0, s.drainPermits());
401		s.release(10);
#	Line 353 | Line 406 | public class SemaphoreTest extends JSR16
406		}
407
408		/**
409	<	* reducePermits reduces number of permits
409	>	* release(-N) throws IllegalArgumentException
410		*/
411	<	public void testReducePermits() {
412	<	PublicSemaphore s = new PublicSemaphore(10, false);
413	<	assertEquals(10, s.availablePermits());
414	<	s.reducePermits(1);
415	<	assertEquals(9, s.availablePermits());
416	<	s.reducePermits(10);
417	<	assertEquals(-1, s.availablePermits());
411	>	public void testReleaseIAE()      { testReleaseIAE(false); }
412	>	public void testReleaseIAE_fair() { testReleaseIAE(true); }
413	>	public void testReleaseIAE(boolean fair) {
414	>	Semaphore s = new Semaphore(10, fair);
415	>	try {
416	>	s.release(-1);
417	>	shouldThrow();
418	>	} catch (IllegalArgumentException success) {}
419		}
420
421		/**
422	<	* a deserialized serialized semaphore has same number of permits
423	<	*/
424	<	public void testSerialization() throws Exception {
425	<	Semaphore l = new Semaphore(3, false);
426	<	l.acquire();
427	<	l.release();
428	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
429	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
430	<	out.writeObject(l);
431	<	out.close();
378	<
379	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
380	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
381	<	Semaphore r = (Semaphore) in.readObject();
382	<	assertEquals(3, r.availablePermits());
383	<	assertFalse(r.isFair());
384	<	r.acquire();
385	<	r.release();
422	>	* reducePermits(-N) throws IllegalArgumentException
423	>	*/
424	>	public void testReducePermitsIAE()      { testReducePermitsIAE(false); }
425	>	public void testReducePermitsIAE_fair() { testReducePermitsIAE(true); }
426	>	public void testReducePermitsIAE(boolean fair) {
427	>	PublicSemaphore s = new PublicSemaphore(10, fair);
428	>	try {
429	>	s.reducePermits(-1);
430	>	shouldThrow();
431	>	} catch (IllegalArgumentException success) {}
432		}
433
388	–
434		/**
435	<	* Zero, negative, and positive initial values are allowed in constructor
435	>	* reducePermits reduces number of permits
436		*/
437	<	public void testConstructor_fair() {
438	<	Semaphore s0 = new Semaphore(0, true);
439	<	assertEquals(0, s0.availablePermits());
440	<	assertTrue(s0.isFair());
441	<	Semaphore s1 = new Semaphore(-1, true);
442	<	assertEquals(-1, s1.availablePermits());
443	<	Semaphore s2 = new Semaphore(-1, true);
444	<	assertEquals(-1, s2.availablePermits());
437	>	public void testReducePermits()      { testReducePermits(false); }
438	>	public void testReducePermits_fair() { testReducePermits(true); }
439	>	public void testReducePermits(boolean fair) {
440	>	PublicSemaphore s = new PublicSemaphore(10, fair);
441	>	assertEquals(10, s.availablePermits());
442	>	s.reducePermits(0);
443	>	assertEquals(10, s.availablePermits());
444	>	s.reducePermits(1);
445	>	assertEquals(9, s.availablePermits());
446	>	s.reducePermits(10);
447	>	assertEquals(-1, s.availablePermits());
448	>	s.reducePermits(10);
449	>	assertEquals(-11, s.availablePermits());
450	>	s.reducePermits(0);
451	>	assertEquals(-11, s.availablePermits());
452		}
453
454		/**
455	<	* tryAcquire succeeds when sufficient permits, else fails
456	<	*/
457	<	public void testTryAcquireInSameThread_fair() {
458	<	Semaphore s = new Semaphore(2, true);
459	<	assertEquals(2, s.availablePermits());
460	<	assertTrue(s.tryAcquire());
461	<	assertTrue(s.tryAcquire());
462	<	assertEquals(0, s.availablePermits());
463	<	assertFalse(s.tryAcquire());
455	>	* a reserialized semaphore has same number of permits and
456	>	* fairness, but no queued threads
457	>	*/
458	>	public void testSerialization()      { testSerialization(false); }
459	>	public void testSerialization_fair() { testSerialization(true); }
460	>	public void testSerialization(boolean fair) {
461	>	try {
462	>	Semaphore s = new Semaphore(3, fair);
463	>	s.acquire();
464	>	s.acquire();
465	>	s.release();
466	>
467	>	Semaphore clone = serialClone(s);
468	>	assertEquals(fair, s.isFair());
469	>	assertEquals(fair, clone.isFair());
470	>	assertEquals(2, s.availablePermits());
471	>	assertEquals(2, clone.availablePermits());
472	>	clone.acquire();
473	>	clone.acquire();
474	>	clone.release();
475	>	assertEquals(2, s.availablePermits());
476	>	assertEquals(1, clone.availablePermits());
477	>	assertFalse(s.hasQueuedThreads());
478	>	assertFalse(clone.hasQueuedThreads());
479	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
480	>
481	>	{
482	>	PublicSemaphore s = new PublicSemaphore(0, fair);
483	>	Thread t = newStartedThread(new InterruptibleLockRunnable(s));
484	>	// waitForQueuedThreads(s); // suffers from "flicker", so ...
485	>	waitForQueuedThread(s, t);  // ... we use this instead
486	>	PublicSemaphore clone = serialClone(s);
487	>	assertEquals(fair, s.isFair());
488	>	assertEquals(fair, clone.isFair());
489	>	assertEquals(0, s.availablePermits());
490	>	assertEquals(0, clone.availablePermits());
491	>	assertTrue(s.hasQueuedThreads());
492	>	assertFalse(clone.hasQueuedThreads());
493	>	s.release();
494	>	awaitTermination(t);
495	>	assertFalse(s.hasQueuedThreads());
496	>	assertFalse(clone.hasQueuedThreads());
497	>	}
498		}
499
500		/**
501		* tryAcquire(n) succeeds when sufficient permits, else fails
502		*/
503	<	public void testTryAcquireNInSameThread_fair() {
504	<	Semaphore s = new Semaphore(2, true);
503	>	public void testTryAcquireNInSameThread()      { testTryAcquireNInSameThread(false); }
504	>	public void testTryAcquireNInSameThread_fair() { testTryAcquireNInSameThread(true); }
505	>	public void testTryAcquireNInSameThread(boolean fair) {
506	>	Semaphore s = new Semaphore(2, fair);
507	>	assertEquals(2, s.availablePermits());
508	>	assertFalse(s.tryAcquire(3));
509		assertEquals(2, s.availablePermits());
510		assertTrue(s.tryAcquire(2));
511		assertEquals(0, s.availablePermits());
512	<	assertFalse(s.tryAcquire());
513	<	}
514	<
425	<	/**
426	<	* Acquire and release of semaphore succeed if initially available
427	<	*/
428	<	public void testAcquireReleaseInSameThread_fair()
429	<	throws InterruptedException {
430	<	Semaphore s = new Semaphore(1, true);
431	<	s.acquire();
432	<	s.release();
433	<	s.acquire();
434	<	s.release();
435	<	s.acquire();
436	<	s.release();
437	<	s.acquire();
438	<	s.release();
439	<	s.acquire();
440	<	s.release();
441	<	assertEquals(1, s.availablePermits());
442	<	}
443	<
444	<	/**
445	<	* Acquire(n) and release(n) of semaphore succeed if initially available
446	<	*/
447	<	public void testAcquireReleaseNInSameThread_fair()
448	<	throws InterruptedException {
449	<	Semaphore s = new Semaphore(1, true);
450	<	s.release(1);
451	<	s.acquire(1);
452	<	s.release(2);
453	<	s.acquire(2);
454	<	s.release(3);
455	<	s.acquire(3);
456	<	s.release(4);
457	<	s.acquire(4);
458	<	s.release(5);
459	<	s.acquire(5);
460	<	assertEquals(1, s.availablePermits());
461	<	}
462	<
463	<	/**
464	<	* Acquire(n) and release(n) of semaphore succeed if initially available
465	<	*/
466	<	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
467	<	Semaphore s = new Semaphore(1, true);
468	<	s.release(1);
469	<	s.acquireUninterruptibly(1);
470	<	s.release(2);
471	<	s.acquireUninterruptibly(2);
472	<	s.release(3);
473	<	s.acquireUninterruptibly(3);
474	<	s.release(4);
475	<	s.acquireUninterruptibly(4);
476	<	s.release(5);
477	<	s.acquireUninterruptibly(5);
478	<	assertEquals(1, s.availablePermits());
479	<	}
480	<
481	<	/**
482	<	* release(n) in one thread enables timed acquire(n) in another thread
483	<	*/
484	<	public void testTimedAcquireReleaseNInSameThread_fair()
485	<	throws InterruptedException {
486	<	Semaphore s = new Semaphore(1, true);
487	<	s.release(1);
488	<	assertTrue(s.tryAcquire(1, SHORT_DELAY_MS, MILLISECONDS));
489	<	s.release(2);
490	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
491	<	s.release(3);
492	<	assertTrue(s.tryAcquire(3, SHORT_DELAY_MS, MILLISECONDS));
493	<	s.release(4);
494	<	assertTrue(s.tryAcquire(4, SHORT_DELAY_MS, MILLISECONDS));
495	<	s.release(5);
496	<	assertTrue(s.tryAcquire(5, SHORT_DELAY_MS, MILLISECONDS));
497	<	assertEquals(1, s.availablePermits());
498	<	}
499	<
500	<	/**
501	<	* release in one thread enables timed acquire in another thread
502	<	*/
503	<	public void testTimedAcquireReleaseInSameThread_fair()
504	<	throws InterruptedException {
505	<	Semaphore s = new Semaphore(1, true);
506	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
507	<	s.release();
508	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
509	<	s.release();
510	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
511	<	s.release();
512	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
513	<	s.release();
514	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
515	<	s.release();
516	<	assertEquals(1, s.availablePermits());
512	>	assertFalse(s.tryAcquire(1));
513	>	assertFalse(s.tryAcquire(2));
514	>	assertEquals(0, s.availablePermits());
515		}
516
517		/**
518	<	* A release in one thread enables an acquire in another thread
518	>	* acquire succeeds if permits available
519		*/
520	<	public void testAcquireReleaseInDifferentThreads_fair()
521	<	throws InterruptedException {
522	<	final Semaphore s = new Semaphore(0, true);
523	<	Thread t = new Thread(new CheckedRunnable() {
524	<	public void realRun() throws InterruptedException {
525	<	s.acquire();
526	<	s.acquire();
527	<	s.acquire();
528	<	s.acquire();
529	<	}});
530	<
531	<	t.start();
532	<	Thread.sleep(SHORT_DELAY_MS);
533	<	s.release();
534	<	s.release();
535	<	s.release();
536	<	s.release();
537	<	s.release();
538	<	s.release();
539	<	t.join();
540	<	assertEquals(2, s.availablePermits());
520	>	public void testReleaseAcquireSameThread_acquire()       { testReleaseAcquireSameThread(false, AcquireMethod.acquire); }
521	>	public void testReleaseAcquireSameThread_acquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquire); }
522	>	public void testReleaseAcquireSameThread_acquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireN); }
523	>	public void testReleaseAcquireSameThread_acquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireN); }
524	>	public void testReleaseAcquireSameThread_acquireUninterruptibly()       { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
525	>	public void testReleaseAcquireSameThread_acquireUninterruptibly_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
526	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
527	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
528	>	public void testReleaseAcquireSameThread_tryAcquire()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquire); }
529	>	public void testReleaseAcquireSameThread_tryAcquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquire); }
530	>	public void testReleaseAcquireSameThread_tryAcquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireN); }
531	>	public void testReleaseAcquireSameThread_tryAcquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireN); }
532	>	public void testReleaseAcquireSameThread_tryAcquireTimed()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimed); }
533	>	public void testReleaseAcquireSameThread_tryAcquireTimed_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimed); }
534	>	public void testReleaseAcquireSameThread_tryAcquireTimedN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimedN); }
535	>	public void testReleaseAcquireSameThread_tryAcquireTimedN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimedN); }
536	>	public void testReleaseAcquireSameThread(boolean fair,
537	>	final AcquireMethod acquirer) {
538	>	Semaphore s = new Semaphore(1, fair);
539	>	for (int i = 1; i < 6; i++) {
540	>	s.release(i);
541	>	assertEquals(1 + i, s.availablePermits());
542	>	try {
543	>	acquirer.acquire(s, i);
544	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
545	>	assertEquals(1, s.availablePermits());
546	>	}
547		}
548
549		/**
550	<	* release(n) in one thread enables acquire(n) in another thread
550	>	* release in one thread enables acquire in another thread
551		*/
552	<	public void testAcquireReleaseNInDifferentThreads_fair()
553	<	throws InterruptedException {
554	<	final Semaphore s = new Semaphore(0, true);
555	<	Thread t = new Thread(new CheckedRunnable() {
556	<	public void realRun() throws InterruptedException {
557	<	s.acquire();
558	<	s.release(2);
559	<	s.acquire();
560	<	}});
561	<
562	<	t.start();
563	<	Thread.sleep(SHORT_DELAY_MS);
564	<	s.release(2);
565	<	s.acquire(2);
566	<	s.release(1);
567	<	t.join();
552	>	public void testReleaseAcquireDifferentThreads_acquire()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquire); }
553	>	public void testReleaseAcquireDifferentThreads_acquire_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquire); }
554	>	public void testReleaseAcquireDifferentThreads_acquireN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireN); }
555	>	public void testReleaseAcquireDifferentThreads_acquireN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireN); }
556	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
557	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
558	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
559	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
560	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimed); }
561	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimed); }
562	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimedN); }
563	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimedN); }
564	>	public void testReleaseAcquireDifferentThreads(boolean fair,
565	>	final AcquireMethod acquirer) {
566	>	final Semaphore s = new Semaphore(0, fair);
567	>	final int rounds = 4;
568	>	long startTime = System.nanoTime();
569	>	Thread t = newStartedThread(new CheckedRunnable() {
570	>	public void realRun() throws InterruptedException {
571	>	for (int i = 0; i < rounds; i++) {
572	>	assertFalse(s.hasQueuedThreads());
573	>	if (i % 2 == 0)
574	>	acquirer.acquire(s);
575	>	else
576	>	acquirer.acquire(s, 3);
577	>	}}});
578	>
579	>	for (int i = 0; i < rounds; i++) {
580	>	while (! (s.availablePermits() == 0 && s.hasQueuedThreads()))
581	>	Thread.yield();
582	>	assertTrue(t.isAlive());
583	>	if (i % 2 == 0)
584	>	s.release();
585	>	else
586	>	s.release(3);
587	>	}
588	>	awaitTermination(t);
589	>	assertEquals(0, s.availablePermits());
590	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
591		}
592
593		/**
594	<	* release(n) in one thread enables acquire(n) in another thread
594	>	* fair locks are strictly FIFO
595		*/
596	<	public void testAcquireReleaseNInDifferentThreads_fair2()
597	<	throws InterruptedException {
598	<	final Semaphore s = new Semaphore(0, true);
599	<	Thread t = new Thread(new CheckedRunnable() {
596	>	public void testFairLocksFifo() {
597	>	final PublicSemaphore s = new PublicSemaphore(1, true);
598	>	final CountDownLatch pleaseRelease = new CountDownLatch(1);
599	>	Thread t1 = newStartedThread(new CheckedRunnable() {
600		public void realRun() throws InterruptedException {
601	<	s.acquire(2);
602	<	s.acquire(2);
576	<	s.release(4);
601	>	// Will block; permits are available, but not three
602	>	s.acquire(3);
603		}});
604
605	<	t.start();
580	<	Thread.sleep(SHORT_DELAY_MS);
581	<	s.release(6);
582	<	s.acquire(2);
583	<	s.acquire(2);
584	<	s.release(2);
585	<	t.join();
586	<	}
605	>	waitForQueuedThread(s, t1);
606
607	<
589	<	/**
590	<	* release in one thread enables timed acquire in another thread
591	<	*/
592	<	public void testTimedAcquireReleaseInDifferentThreads_fair()
593	<	throws InterruptedException {
594	<	final Semaphore s = new Semaphore(1, true);
595	<	Thread t = new Thread(new CheckedRunnable() {
607	>	Thread t2 = newStartedThread(new CheckedRunnable() {
608		public void realRun() throws InterruptedException {
609	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
610	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
611	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
612	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
613	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
602	<	}});
603	<
604	<	t.start();
605	<	s.release();
606	<	s.release();
607	<	s.release();
608	<	s.release();
609	<	s.release();
610	<	t.join();
611	<	}
609	>	// Will fail, even though 1 permit is available
610	>	assertFalse(
611	>	s.tryAcquire(randomExpiredTimeout(), randomTimeUnit()));
612	>	assertFalse(
613	>	s.tryAcquire(1, randomExpiredTimeout(), randomTimeUnit()));
614
615	<	/**
616	<	* release(n) in one thread enables timed acquire(n) in another thread
615	<	*/
616	<	public void testTimedAcquireReleaseNInDifferentThreads_fair()
617	<	throws InterruptedException {
618	<	final Semaphore s = new Semaphore(2, true);
619	<	Thread t = new Thread(new CheckedRunnable() {
620	<	public void realRun() throws InterruptedException {
621	<	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);
625	<	}});
626	<
627	<	t.start();
628	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
629	<	s.release(2);
630	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
631	<	s.release(2);
632	<	t.join();
633	<	}
618	>	assertTrue(s.tryAcquire(2));
619	>	s.release();
620
621	<	/**
622	<	* A waiting acquire blocks interruptibly
637	<	*/
638	<	public void testAcquire_InterruptedException_fair()
639	<	throws InterruptedException {
640	<	final Semaphore s = new Semaphore(0, true);
641	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
642	<	public void realRun() throws InterruptedException {
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	<	/**
653	<	* A waiting acquire(n) blocks interruptibly
654	<	*/
655	<	public void testAcquireN_InterruptedException_fair()
656	<	throws InterruptedException {
657	<	final Semaphore s = new Semaphore(2, true);
658	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
659	<	public void realRun() throws InterruptedException {
660	<	s.acquire(3);
661	<	}});
662	<
663	<	t.start();
664	<	Thread.sleep(SHORT_DELAY_MS);
665	<	t.interrupt();
666	<	t.join();
667	<	}
668	<
669	<	/**
670	<	*  A waiting tryAcquire blocks interruptibly
671	<	*/
672	<	public void testTryAcquire_InterruptedException_fair()
673	<	throws InterruptedException {
674	<	final Semaphore s = new Semaphore(0, true);
675	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
676	<	public void realRun() throws InterruptedException {
677	<	s.tryAcquire(MEDIUM_DELAY_MS, MILLISECONDS);
678	<	}});
679	<
680	<	t.start();
681	<	Thread.sleep(SHORT_DELAY_MS);
682	<	t.interrupt();
683	<	t.join();
684	<	}
685	<
686	<	/**
687	<	*  A waiting tryAcquire(n) blocks interruptibly
688	<	*/
689	<	public void testTryAcquireN_InterruptedException_fair()
690	<	throws InterruptedException {
691	<	final Semaphore s = new Semaphore(1, true);
692	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
693	<	public void realRun() throws InterruptedException {
694	<	s.tryAcquire(4, MEDIUM_DELAY_MS, MILLISECONDS);
695	<	}});
696	<
697	<	t.start();
698	<	Thread.sleep(SHORT_DELAY_MS);
699	<	t.interrupt();
700	<	t.join();
701	<	}
702	<
703	<	/**
704	<	* getQueueLength reports number of waiting threads
705	<	*/
706	<	public void testGetQueueLength_fair() throws InterruptedException {
707	<	final Semaphore lock = new Semaphore(1, true);
708	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
709	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
710	<	assertEquals(0, lock.getQueueLength());
711	<	lock.acquireUninterruptibly();
712	<	t1.start();
713	<	Thread.sleep(SHORT_DELAY_MS);
714	<	assertEquals(1, lock.getQueueLength());
715	<	t2.start();
716	<	Thread.sleep(SHORT_DELAY_MS);
717	<	assertEquals(2, lock.getQueueLength());
718	<	t1.interrupt();
719	<	Thread.sleep(SHORT_DELAY_MS);
720	<	assertEquals(1, lock.getQueueLength());
721	<	lock.release();
722	<	Thread.sleep(SHORT_DELAY_MS);
723	<	assertEquals(0, lock.getQueueLength());
724	<	t1.join();
725	<	t2.join();
726	<	}
727	<
728	<
729	<	/**
730	<	* a deserialized serialized semaphore has same number of permits
731	<	*/
732	<	public void testSerialization_fair() throws Exception {
733	<	Semaphore l = new Semaphore(3, true);
734	<
735	<	l.acquire();
736	<	l.release();
737	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
738	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
739	<	out.writeObject(l);
740	<	out.close();
741	<
742	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
743	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
744	<	Semaphore r = (Semaphore) in.readObject();
745	<	assertEquals(3, r.availablePermits());
746	<	assertTrue(r.isFair());
747	<	r.acquire();
748	<	r.release();
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);
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 s1 = s.toString();
645	<	assertTrue(s1.indexOf("Permits = 1") >= 0);
646	<	s.release();
647	<	String s2 = s.toString();
648	<	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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