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

Comparing jsr166/src/test/tck/SemaphoreTest.java (file contents):
Revision 1.6 by dl, Mon Nov 3 13:50:07 2003 UTC vs.
Revision 1.32 by jsr166, Wed Dec 31 19:05:43 2014 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
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/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.*;
12	<	import java.io.*;
9	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
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	>	junit.textui.TestRunner.run(suite());
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); }
32	<	public Collection<Thread> getQueuedThreads() {
33	<	return super.getQueuedThreads();
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 boolean hasQueuedThread(Thread t) {
37	>	return super.getQueuedThreads().contains(t);
38		}
39	<	public void reducePermits(int p) {
40	<	super.reducePermits(p);
39	>	public void reducePermits(int reduction) {
40	>	super.reducePermits(reduction);
41		}
42		}
43
44		/**
45		* A runnable calling acquire
46		*/
47	<	class InterruptibleLockRunnable implements Runnable {
47	>	class InterruptibleLockRunnable extends CheckedRunnable {
48		final Semaphore lock;
49	<	InterruptibleLockRunnable(Semaphore l) { lock = l; }
50	<	public void run() {
49	>	InterruptibleLockRunnable(Semaphore s) { lock = s; }
50	>	public void realRun() {
51		try {
52		lock.acquire();
53	<	} catch(InterruptedException success){}
53	>	}
54	>	catch (InterruptedException ignored) {}
55		}
56		}
57
47	–
58		/**
59	<	* A runnable calling acquire that expects to be
50	<	* interrupted
59	>	* A runnable calling acquire that expects to be interrupted
60		*/
61	<	class InterruptedLockRunnable implements Runnable {
61	>	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
62		final Semaphore lock;
63	<	InterruptedLockRunnable(Semaphore l) { lock = l; }
64	<	public void run() {
65	<	try {
66	<	lock.acquire();
67	<	threadShouldThrow();
68	<	} catch(InterruptedException success){}
63	>	InterruptedLockRunnable(Semaphore s) { lock = s; }
64	>	public void realRun() throws InterruptedException {
65	>	lock.acquire();
66	>	}
67	>	}
68	>
69	>	/**
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	>	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	>	},
131	>	tryAcquireTimedN {
132	>	void acquire(Semaphore s, int permits) throws InterruptedException {
133	>	assertTrue(s.tryAcquire(permits, 2 * LONG_DELAY_MS, MILLISECONDS));
134	>	}
135	>	};
136	>
137	>	// Intentionally meta-circular
138	>
139	>	/** Acquires 1 permit. */
140	>	void acquire(Semaphore s) throws InterruptedException {
141	>	acquire(s, 1);
142	>	}
143	>	/** Acquires the given number of permits. */
144	>	void acquire(Semaphore s, int permits) throws InterruptedException {
145	>	for (int i = 0; i < permits; i++)
146	>	acquire(s);
147		}
148		}
149
150		/**
151		* Zero, negative, and positive initial values are allowed in constructor
152		*/
153	<	public void testConstructor() {
154	<	Semaphore s0 = new Semaphore(0, false);
155	<	assertEquals(0, s0.availablePermits());
156	<	assertFalse(s0.isFair());
157	<	Semaphore s1 = new Semaphore(-1, false);
158	<	assertEquals(-1, s1.availablePermits());
159	<	Semaphore s2 = new Semaphore(-1, false);
160	<	assertEquals(-1, s2.availablePermits());
153	>	public void testConstructor()      { testConstructor(false); }
154	>	public void testConstructor_fair() { testConstructor(true); }
155	>	public void testConstructor(boolean fair) {
156	>	for (int permits : new int[] { -42, -1, 0, 1, 42 }) {
157	>	Semaphore s = new Semaphore(permits, fair);
158	>	assertEquals(permits, s.availablePermits());
159	>	assertEquals(fair, s.isFair());
160	>	}
161		}
162
163		/**
164	<	* tryAcquire succeeds when sufficent permits, else fails
164	>	* Constructor without fairness argument behaves as nonfair
165		*/
166	<	public void testTryAcquireInSameThread() {
167	<	Semaphore s = new Semaphore(2, false);
166	>	public void testConstructorDefaultsToNonFair() {
167	>	for (int permits : new int[] { -42, -1, 0, 1, 42 }) {
168	>	Semaphore s = new Semaphore(permits);
169	>	assertEquals(permits, s.availablePermits());
170	>	assertFalse(s.isFair());
171	>	}
172	>	}
173	>
174	>	/**
175	>	* tryAcquire succeeds when sufficient permits, else fails
176	>	*/
177	>	public void testTryAcquireInSameThread()      { testTryAcquireInSameThread(false); }
178	>	public void testTryAcquireInSameThread_fair() { testTryAcquireInSameThread(true); }
179	>	public void testTryAcquireInSameThread(boolean fair) {
180	>	Semaphore s = new Semaphore(2, fair);
181		assertEquals(2, s.availablePermits());
182		assertTrue(s.tryAcquire());
183		assertTrue(s.tryAcquire());
184		assertEquals(0, s.availablePermits());
185		assertFalse(s.tryAcquire());
186	+	assertFalse(s.tryAcquire());
187	+	assertEquals(0, s.availablePermits());
188		}
189
190		/**
191	<	* Acquire and release of semaphore succeed if initially available
191	>	* timed tryAcquire times out
192		*/
193	<	public void testAcquireReleaseInSameThread() {
194	<	Semaphore s = new Semaphore(1, false);
195	<	try {
196	<	s.acquire();
197	<	s.release();
198	<	s.acquire();
199	<	s.release();
200	<	s.acquire();
201	<	s.release();
202	<	s.acquire();
203	<	s.release();
204	<	s.acquire();
205	<	s.release();
206	<	assertEquals(1, s.availablePermits());
207	<	} catch( InterruptedException e){
208	<	unexpectedException();
209	<	}
193	>	public void testTryAcquire_timeout()      { testTryAcquire_timeout(false); }
194	>	public void testTryAcquire_timeout_fair() { testTryAcquire_timeout(true); }
195	>	public void testTryAcquire_timeout(boolean fair) {
196	>	Semaphore s = new Semaphore(0, fair);
197	>	long startTime = System.nanoTime();
198	>	try { assertFalse(s.tryAcquire(timeoutMillis(), MILLISECONDS)); }
199	>	catch (InterruptedException e) { threadUnexpectedException(e); }
200	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
201	>	}
202	>
203	>	/**
204	>	* timed tryAcquire(N) times out
205	>	*/
206	>	public void testTryAcquireN_timeout()      { testTryAcquireN_timeout(false); }
207	>	public void testTryAcquireN_timeout_fair() { testTryAcquireN_timeout(true); }
208	>	public void testTryAcquireN_timeout(boolean fair) {
209	>	Semaphore s = new Semaphore(2, fair);
210	>	long startTime = System.nanoTime();
211	>	try { assertFalse(s.tryAcquire(3, timeoutMillis(), MILLISECONDS)); }
212	>	catch (InterruptedException e) { threadUnexpectedException(e); }
213	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
214	>	}
215	>
216	>	/**
217	>	* acquire(), acquire(N), timed tryAcquired, timed tryAcquire(N)
218	>	* are interruptible
219	>	*/
220	>	public void testInterruptible_acquire()               { testInterruptible(false, AcquireMethod.acquire); }
221	>	public void testInterruptible_acquire_fair()          { testInterruptible(true,  AcquireMethod.acquire); }
222	>	public void testInterruptible_acquireN()              { testInterruptible(false, AcquireMethod.acquireN); }
223	>	public void testInterruptible_acquireN_fair()         { testInterruptible(true,  AcquireMethod.acquireN); }
224	>	public void testInterruptible_tryAcquireTimed()       { testInterruptible(false, AcquireMethod.tryAcquireTimed); }
225	>	public void testInterruptible_tryAcquireTimed_fair()  { testInterruptible(true,  AcquireMethod.tryAcquireTimed); }
226	>	public void testInterruptible_tryAcquireTimedN()      { testInterruptible(false, AcquireMethod.tryAcquireTimedN); }
227	>	public void testInterruptible_tryAcquireTimedN_fair() { testInterruptible(true,  AcquireMethod.tryAcquireTimedN); }
228	>	public void testInterruptible(boolean fair, final AcquireMethod acquirer) {
229	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
230	>	final Semaphore pleaseInterrupt = new Semaphore(0, fair);
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	>
240	>	// Interrupt during acquire
241	>	try {
242	>	acquirer.acquire(s);
243	>	shouldThrow();
244	>	} catch (InterruptedException success) {}
245	>
246	>	// Interrupt before acquire(N)
247	>	Thread.currentThread().interrupt();
248	>	try {
249	>	acquirer.acquire(s, 3);
250	>	shouldThrow();
251	>	} catch (InterruptedException success) {}
252	>
253	>	pleaseInterrupt.release();
254	>
255	>	// Interrupt during acquire(N)
256	>	try {
257	>	acquirer.acquire(s, 3);
258	>	shouldThrow();
259	>	} catch (InterruptedException success) {}
260	>	}});
261	>
262	>	waitForQueuedThread(s, t);
263	>	t.interrupt();
264	>	await(pleaseInterrupt);
265	>	waitForQueuedThread(s, t);
266	>	t.interrupt();
267	>	awaitTermination(t);
268	>	}
269	>
270	>	/**
271	>	* acquireUninterruptibly(), acquireUninterruptibly(N) are
272	>	* uninterruptible
273	>	*/
274	>	public void testUninterruptible_acquireUninterruptibly()       { testUninterruptible(false, AcquireMethod.acquireUninterruptibly); }
275	>	public void testUninterruptible_acquireUninterruptibly_fair()  { testUninterruptible(true,  AcquireMethod.acquireUninterruptibly); }
276	>	public void testUninterruptible_acquireUninterruptiblyN()      { testUninterruptible(false, AcquireMethod.acquireUninterruptiblyN); }
277	>	public void testUninterruptible_acquireUninterruptiblyN_fair() { testUninterruptible(true,  AcquireMethod.acquireUninterruptiblyN); }
278	>	public void testUninterruptible(boolean fair, final AcquireMethod acquirer) {
279	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
280	>	final Semaphore pleaseInterrupt = new Semaphore(-1, fair);
281	>
282	>	Thread t1 = newStartedThread(new CheckedRunnable() {
283	>	public void realRun() throws InterruptedException {
284	>	// Interrupt before acquire
285	>	pleaseInterrupt.release();
286	>	Thread.currentThread().interrupt();
287	>	acquirer.acquire(s);
288	>	assertTrue(Thread.interrupted());
289	>	}});
290	>
291	>	Thread t2 = newStartedThread(new CheckedRunnable() {
292	>	public void realRun() throws InterruptedException {
293	>	// Interrupt during acquire
294	>	pleaseInterrupt.release();
295	>	acquirer.acquire(s);
296	>	assertTrue(Thread.interrupted());
297	>	}});
298	>
299	>	await(pleaseInterrupt);
300	>	waitForQueuedThread(s, t1);
301	>	waitForQueuedThread(s, t2);
302	>	t2.interrupt();
303	>
304	>	assertThreadStaysAlive(t1);
305	>	assertTrue(t2.isAlive());
306	>
307	>	s.release(2);
308	>
309	>	awaitTermination(t1);
310	>	awaitTermination(t2);
311	>	}
312	>
313	>	/**
314	>	* hasQueuedThreads reports whether there are waiting threads
315	>	*/
316	>	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
317	>	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
318	>	public void testHasQueuedThreads(boolean fair) {
319	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
320	>	assertFalse(lock.hasQueuedThreads());
321	>	lock.acquireUninterruptibly();
322	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
323	>	waitForQueuedThread(lock, t1);
324	>	assertTrue(lock.hasQueuedThreads());
325	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
326	>	waitForQueuedThread(lock, t2);
327	>	assertTrue(lock.hasQueuedThreads());
328	>	t1.interrupt();
329	>	awaitTermination(t1);
330	>	assertTrue(lock.hasQueuedThreads());
331	>	lock.release();
332	>	awaitTermination(t2);
333	>	assertFalse(lock.hasQueuedThreads());
334		}
335
336		/**
337	<	* Uninterruptible acquire and release of semaphore succeed if
112	<	* initially available
337	>	* getQueueLength reports number of waiting threads
338		*/
339	<	public void testAcquireUninterruptiblyReleaseInSameThread() {
340	<	Semaphore s = new Semaphore(1, false);
341	<	try {
342	<	s.acquireUninterruptibly();
343	<	s.release();
344	<	s.acquireUninterruptibly();
345	<	s.release();
346	<	s.acquireUninterruptibly();
347	<	s.release();
348	<	s.acquireUninterruptibly();
349	<	s.release();
350	<	s.acquireUninterruptibly();
351	<	s.release();
352	<	assertEquals(1, s.availablePermits());
353	<	} finally {
354	<	}
339	>	public void testGetQueueLength()      { testGetQueueLength(false); }
340	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
341	>	public void testGetQueueLength(boolean fair) {
342	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
343	>	assertEquals(0, lock.getQueueLength());
344	>	lock.acquireUninterruptibly();
345	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
346	>	waitForQueuedThread(lock, t1);
347	>	assertEquals(1, lock.getQueueLength());
348	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
349	>	waitForQueuedThread(lock, t2);
350	>	assertEquals(2, lock.getQueueLength());
351	>	t1.interrupt();
352	>	awaitTermination(t1);
353	>	assertEquals(1, lock.getQueueLength());
354	>	lock.release();
355	>	awaitTermination(t2);
356	>	assertEquals(0, lock.getQueueLength());
357		}
358
359		/**
360	<	* Timed Acquire and release of semaphore succeed if
134	<	* initially available
360	>	* getQueuedThreads includes waiting threads
361		*/
362	<	public void testTimedAcquireReleaseInSameThread() {
363	<	Semaphore s = new Semaphore(1, false);
364	<	try {
365	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
366	<	s.release();
367	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
368	<	s.release();
369	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
370	<	s.release();
371	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
372	<	s.release();
373	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
374	<	s.release();
375	<	assertEquals(1, s.availablePermits());
376	<	} catch( InterruptedException e){
377	<	unexpectedException();
378	<	}
362	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
363	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
364	>	public void testGetQueuedThreads(boolean fair) {
365	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
366	>	assertTrue(lock.getQueuedThreads().isEmpty());
367	>	lock.acquireUninterruptibly();
368	>	assertTrue(lock.getQueuedThreads().isEmpty());
369	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
370	>	waitForQueuedThread(lock, t1);
371	>	assertTrue(lock.getQueuedThreads().contains(t1));
372	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
373	>	waitForQueuedThread(lock, t2);
374	>	assertTrue(lock.getQueuedThreads().contains(t1));
375	>	assertTrue(lock.getQueuedThreads().contains(t2));
376	>	t1.interrupt();
377	>	awaitTermination(t1);
378	>	assertFalse(lock.getQueuedThreads().contains(t1));
379	>	assertTrue(lock.getQueuedThreads().contains(t2));
380	>	lock.release();
381	>	awaitTermination(t2);
382	>	assertTrue(lock.getQueuedThreads().isEmpty());
383		}
384
385		/**
386	<	* A release in one thread enables an acquire in another thread
387	<	*/
388	<	public void testAcquireReleaseInDifferentThreads() {
389	<	final Semaphore s = new Semaphore(0, false);
390	<	Thread t = new Thread(new Runnable() {
391	<	public void run() {
392	<	try {
393	<	s.acquire();
394	<	s.release();
395	<	s.release();
396	<	s.acquire();
397	<	} catch(InterruptedException ie){
398	<	threadUnexpectedException();
169	<	}
170	<	}
171	<	});
172	<	try {
173	<	t.start();
174	<	Thread.sleep(SHORT_DELAY_MS);
175	<	s.release();
176	<	s.release();
177	<	s.acquire();
178	<	s.acquire();
179	<	s.release();
180	<	t.join();
181	<	} catch( InterruptedException e){
182	<	unexpectedException();
183	<	}
386	>	* drainPermits reports and removes given number of permits
387	>	*/
388	>	public void testDrainPermits()      { testDrainPermits(false); }
389	>	public void testDrainPermits_fair() { testDrainPermits(true); }
390	>	public void testDrainPermits(boolean fair) {
391	>	Semaphore s = new Semaphore(0, fair);
392	>	assertEquals(0, s.availablePermits());
393	>	assertEquals(0, s.drainPermits());
394	>	s.release(10);
395	>	assertEquals(10, s.availablePermits());
396	>	assertEquals(10, s.drainPermits());
397	>	assertEquals(0, s.availablePermits());
398	>	assertEquals(0, s.drainPermits());
399		}
400
401		/**
402	<	* A release in one thread enables an uninterruptible acquire in another thread
402	>	* release(-N) throws IllegalArgumentException
403		*/
404	<	public void testUninterruptibleAcquireReleaseInDifferentThreads() {
405	<	final Semaphore s = new Semaphore(0, false);
406	<	Thread t = new Thread(new Runnable() {
407	<	public void run() {
193	<	s.acquireUninterruptibly();
194	<	s.release();
195	<	s.release();
196	<	s.acquireUninterruptibly();
197	<	}
198	<	});
404	>	public void testReleaseIAE()      { testReleaseIAE(false); }
405	>	public void testReleaseIAE_fair() { testReleaseIAE(true); }
406	>	public void testReleaseIAE(boolean fair) {
407	>	Semaphore s = new Semaphore(10, fair);
408		try {
409	<	t.start();
410	<	Thread.sleep(SHORT_DELAY_MS);
411	<	s.release();
203	<	s.release();
204	<	s.acquireUninterruptibly();
205	<	s.acquireUninterruptibly();
206	<	s.release();
207	<	t.join();
208	<	} catch( InterruptedException e){
209	<	unexpectedException();
210	<	}
409	>	s.release(-1);
410	>	shouldThrow();
411	>	} catch (IllegalArgumentException success) {}
412		}
413
213	–
414		/**
415	<	*  A release in one thread enables a timed acquire in another thread
415	>	* reducePermits(-N) throws IllegalArgumentException
416		*/
417	<	public void testTimedAcquireReleaseInDifferentThreads() {
418	<	final Semaphore s = new Semaphore(1, false);
419	<	Thread t = new Thread(new Runnable() {
420	<	public void run() {
221	<	try {
222	<	s.release();
223	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
224	<	s.release();
225	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
226	<
227	<	} catch(InterruptedException ie){
228	<	threadUnexpectedException();
229	<	}
230	<	}
231	<	});
417	>	public void testReducePermitsIAE()      { testReducePermitsIAE(false); }
418	>	public void testReducePermitsIAE_fair() { testReducePermitsIAE(true); }
419	>	public void testReducePermitsIAE(boolean fair) {
420	>	PublicSemaphore s = new PublicSemaphore(10, fair);
421		try {
422	<	t.start();
423	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
424	<	s.release();
236	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
237	<	s.release();
238	<	s.release();
239	<	t.join();
240	<	} catch( InterruptedException e){
241	<	unexpectedException();
242	<	}
243	<	}
244	<
245	<	/**
246	<	* A waiting acquire blocks interruptibly
247	<	*/
248	<	public void testAcquire_InterruptedException() {
249	<	final Semaphore s = new Semaphore(0, false);
250	<	Thread t = new Thread(new Runnable() {
251	<	public void run() {
252	<	try {
253	<	s.acquire();
254	<	threadShouldThrow();
255	<	} catch(InterruptedException success){}
256	<	}
257	<	});
258	<	t.start();
259	<	try {
260	<	Thread.sleep(SHORT_DELAY_MS);
261	<	t.interrupt();
262	<	t.join();
263	<	} catch(InterruptedException e){
264	<	unexpectedException();
265	<	}
266	<	}
267	<
268	<	/**
269	<	*  A waiting timed acquire blocks interruptibly
270	<	*/
271	<	public void testTryAcquire_InterruptedException() {
272	<	final Semaphore s = new Semaphore(0, false);
273	<	Thread t = new Thread(new Runnable() {
274	<	public void run() {
275	<	try {
276	<	s.tryAcquire(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
277	<	threadShouldThrow();
278	<	} catch(InterruptedException success){
279	<	}
280	<	}
281	<	});
282	<	t.start();
283	<	try {
284	<	Thread.sleep(SHORT_DELAY_MS);
285	<	t.interrupt();
286	<	t.join();
287	<	} catch(InterruptedException e){
288	<	unexpectedException();
289	<	}
422	>	s.reducePermits(-1);
423	>	shouldThrow();
424	>	} catch (IllegalArgumentException success) {}
425		}
426
427		/**
293	–	* getQueueLength reports number of waiting threads
294	–	*/
295	–	public void testGetQueueLength() {
296	–	final Semaphore lock = new Semaphore(1, false);
297	–	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
298	–	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
299	–	try {
300	–	assertEquals(0, lock.getQueueLength());
301	–	lock.acquireUninterruptibly();
302	–	t1.start();
303	–	Thread.sleep(SHORT_DELAY_MS);
304	–	assertEquals(1, lock.getQueueLength());
305	–	t2.start();
306	–	Thread.sleep(SHORT_DELAY_MS);
307	–	assertEquals(2, lock.getQueueLength());
308	–	t1.interrupt();
309	–	Thread.sleep(SHORT_DELAY_MS);
310	–	assertEquals(1, lock.getQueueLength());
311	–	lock.release();
312	–	Thread.sleep(SHORT_DELAY_MS);
313	–	assertEquals(0, lock.getQueueLength());
314	–	t1.join();
315	–	t2.join();
316	–	} catch(Exception e){
317	–	unexpectedException();
318	–	}
319	–	}
320	–
321	–	/**
322	–	* getQueuedThreads includes waiting threads
323	–	*/
324	–	public void testGetQueuedThreads() {
325	–	final PublicSemaphore lock = new PublicSemaphore(1, false);
326	–	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
327	–	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
328	–	try {
329	–	assertTrue(lock.getQueuedThreads().isEmpty());
330	–	lock.acquireUninterruptibly();
331	–	assertTrue(lock.getQueuedThreads().isEmpty());
332	–	t1.start();
333	–	Thread.sleep(SHORT_DELAY_MS);
334	–	assertTrue(lock.getQueuedThreads().contains(t1));
335	–	t2.start();
336	–	Thread.sleep(SHORT_DELAY_MS);
337	–	assertTrue(lock.getQueuedThreads().contains(t1));
338	–	assertTrue(lock.getQueuedThreads().contains(t2));
339	–	t1.interrupt();
340	–	Thread.sleep(SHORT_DELAY_MS);
341	–	assertFalse(lock.getQueuedThreads().contains(t1));
342	–	assertTrue(lock.getQueuedThreads().contains(t2));
343	–	lock.release();
344	–	Thread.sleep(SHORT_DELAY_MS);
345	–	assertTrue(lock.getQueuedThreads().isEmpty());
346	–	t1.join();
347	–	t2.join();
348	–	} catch(Exception e){
349	–	unexpectedException();
350	–	}
351	–	}
352	–
353	–
354	–	/**
428		* reducePermits reduces number of permits
429		*/
430	<	public void testReducePermits() {
431	<	PublicSemaphore s = new PublicSemaphore(10, false);
430	>	public void testReducePermits()      { testReducePermits(false); }
431	>	public void testReducePermits_fair() { testReducePermits(true); }
432	>	public void testReducePermits(boolean fair) {
433	>	PublicSemaphore s = new PublicSemaphore(10, fair);
434	>	assertEquals(10, s.availablePermits());
435	>	s.reducePermits(0);
436		assertEquals(10, s.availablePermits());
437		s.reducePermits(1);
438		assertEquals(9, s.availablePermits());
439		s.reducePermits(10);
440		assertEquals(-1, s.availablePermits());
441	+	s.reducePermits(10);
442	+	assertEquals(-11, s.availablePermits());
443	+	s.reducePermits(0);
444	+	assertEquals(-11, s.availablePermits());
445		}
446
447		/**
448	<	* a deserialized serialized semaphore has same number of permits
448	>	* a reserialized semaphore has same number of permits and
449	>	* fairness, but no queued threads
450		*/
451	<	public void testSerialization() {
452	<	Semaphore l = new Semaphore(3, false);
451	>	public void testSerialization()      { testSerialization(false); }
452	>	public void testSerialization_fair() { testSerialization(true); }
453	>	public void testSerialization(boolean fair) {
454		try {
455	<	l.acquire();
456	<	l.release();
457	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
458	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
376	<	out.writeObject(l);
377	<	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();
386	<	} catch(Exception e){
387	<	unexpectedException();
388	<	}
389	<	}
455	>	Semaphore s = new Semaphore(3, fair);
456	>	s.acquire();
457	>	s.acquire();
458	>	s.release();
459
460	+	Semaphore clone = serialClone(s);
461	+	assertEquals(fair, s.isFair());
462	+	assertEquals(fair, clone.isFair());
463	+	assertEquals(2, s.availablePermits());
464	+	assertEquals(2, clone.availablePermits());
465	+	clone.acquire();
466	+	clone.acquire();
467	+	clone.release();
468	+	assertEquals(2, s.availablePermits());
469	+	assertEquals(1, clone.availablePermits());
470
471	<	/**
472	<	* Zero, negative, and positive initial values are allowed in constructor
473	<	*/
474	<	public void testConstructor_fair() {
475	<	Semaphore s0 = new Semaphore(0, true);
476	<	assertEquals(0, s0.availablePermits());
477	<	assertTrue(s0.isFair());
478	<	Semaphore s1 = new Semaphore(-1, true);
479	<	assertEquals(-1, s1.availablePermits());
480	<	Semaphore s2 = new Semaphore(-1, true);
481	<	assertEquals(-1, s2.availablePermits());
471	>	s = new Semaphore(0, fair);
472	>	Thread t = newStartedThread(new InterruptibleLockRunnable(s));
473	>	waitForQueuedThreads(s);
474	>	clone = serialClone(s);
475	>	assertEquals(fair, s.isFair());
476	>	assertEquals(fair, clone.isFair());
477	>	assertEquals(0, s.availablePermits());
478	>	assertEquals(0, clone.availablePermits());
479	>	assertTrue(s.hasQueuedThreads());
480	>	assertFalse(clone.hasQueuedThreads());
481	>	s.release();
482	>	awaitTermination(t);
483	>	assertFalse(s.hasQueuedThreads());
484	>	assertFalse(clone.hasQueuedThreads());
485	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
486		}
487
488		/**
489	<	* tryAcquire succeeds when sufficent permits, else fails
490	<	*/
491	<	public void testTryAcquireInSameThread_fair() {
492	<	Semaphore s = new Semaphore(2, true);
489	>	* tryAcquire(n) succeeds when sufficient permits, else fails
490	>	*/
491	>	public void testTryAcquireNInSameThread()      { testTryAcquireNInSameThread(false); }
492	>	public void testTryAcquireNInSameThread_fair() { testTryAcquireNInSameThread(true); }
493	>	public void testTryAcquireNInSameThread(boolean fair) {
494	>	Semaphore s = new Semaphore(2, fair);
495		assertEquals(2, s.availablePermits());
496	<	assertTrue(s.tryAcquire());
412	<	assertTrue(s.tryAcquire());
413	<	assertEquals(0, s.availablePermits());
414	<	assertFalse(s.tryAcquire());
415	<	}
416	<
417	<	/**
418	<	* tryAcquire(n) succeeds when sufficent permits, else fails
419	<	*/
420	<	public void testTryAcquireNInSameThread_fair() {
421	<	Semaphore s = new Semaphore(2, true);
496	>	assertFalse(s.tryAcquire(3));
497		assertEquals(2, s.availablePermits());
498		assertTrue(s.tryAcquire(2));
499		assertEquals(0, s.availablePermits());
500	<	assertFalse(s.tryAcquire());
501	<	}
502	<
428	<	/**
429	<	* Acquire and release of semaphore succeed if initially available
430	<	*/
431	<	public void testAcquireReleaseInSameThread_fair() {
432	<	Semaphore s = new Semaphore(1, true);
433	<	try {
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	<	s.acquire();
443	<	s.release();
444	<	assertEquals(1, s.availablePermits());
445	<	} catch( InterruptedException e){
446	<	unexpectedException();
447	<	}
448	<	}
449	<
450	<	/**
451	<	* Acquire(n) and release(n) of semaphore succeed if initially available
452	<	*/
453	<	public void testAcquireReleaseNInSameThread_fair() {
454	<	Semaphore s = new Semaphore(1, true);
455	<	try {
456	<	s.release(1);
457	<	s.acquire(1);
458	<	s.release(2);
459	<	s.acquire(2);
460	<	s.release(3);
461	<	s.acquire(3);
462	<	s.release(4);
463	<	s.acquire(4);
464	<	s.release(5);
465	<	s.acquire(5);
466	<	assertEquals(1, s.availablePermits());
467	<	} catch( InterruptedException e){
468	<	unexpectedException();
469	<	}
470	<	}
471	<
472	<	/**
473	<	* Acquire(n) and release(n) of semaphore succeed if initially available
474	<	*/
475	<	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
476	<	Semaphore s = new Semaphore(1, true);
477	<	try {
478	<	s.release(1);
479	<	s.acquireUninterruptibly(1);
480	<	s.release(2);
481	<	s.acquireUninterruptibly(2);
482	<	s.release(3);
483	<	s.acquireUninterruptibly(3);
484	<	s.release(4);
485	<	s.acquireUninterruptibly(4);
486	<	s.release(5);
487	<	s.acquireUninterruptibly(5);
488	<	assertEquals(1, s.availablePermits());
489	<	} finally {
490	<	}
491	<	}
492	<
493	<	/**
494	<	* release(n) in one thread enables timed acquire(n) in another thread
495	<	*/
496	<	public void testTimedAcquireReleaseNInSameThread_fair() {
497	<	Semaphore s = new Semaphore(1, true);
498	<	try {
499	<	s.release(1);
500	<	assertTrue(s.tryAcquire(1, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
501	<	s.release(2);
502	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
503	<	s.release(3);
504	<	assertTrue(s.tryAcquire(3, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
505	<	s.release(4);
506	<	assertTrue(s.tryAcquire(4, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
507	<	s.release(5);
508	<	assertTrue(s.tryAcquire(5, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
509	<	assertEquals(1, s.availablePermits());
510	<	} catch( InterruptedException e){
511	<	unexpectedException();
512	<	}
500	>	assertFalse(s.tryAcquire(1));
501	>	assertFalse(s.tryAcquire(2));
502	>	assertEquals(0, s.availablePermits());
503		}
504
505		/**
506	<	* release in one thread enables timed acquire in another thread
506	>	* acquire succeeds if permits available
507		*/
508	<	public void testTimedAcquireReleaseInSameThread_fair() {
509	<	Semaphore s = new Semaphore(1, true);
510	<	try {
511	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
512	<	s.release();
513	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
514	<	s.release();
515	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
516	<	s.release();
517	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
518	<	s.release();
519	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
520	<	s.release();
508	>	public void testReleaseAcquireSameThread_acquire()       { testReleaseAcquireSameThread(false, AcquireMethod.acquire); }
509	>	public void testReleaseAcquireSameThread_acquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquire); }
510	>	public void testReleaseAcquireSameThread_acquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireN); }
511	>	public void testReleaseAcquireSameThread_acquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireN); }
512	>	public void testReleaseAcquireSameThread_acquireUninterruptibly()       { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
513	>	public void testReleaseAcquireSameThread_acquireUninterruptibly_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
514	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
515	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
516	>	public void testReleaseAcquireSameThread_tryAcquire()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquire); }
517	>	public void testReleaseAcquireSameThread_tryAcquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquire); }
518	>	public void testReleaseAcquireSameThread_tryAcquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireN); }
519	>	public void testReleaseAcquireSameThread_tryAcquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireN); }
520	>	public void testReleaseAcquireSameThread_tryAcquireTimed()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimed); }
521	>	public void testReleaseAcquireSameThread_tryAcquireTimed_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimed); }
522	>	public void testReleaseAcquireSameThread_tryAcquireTimedN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimedN); }
523	>	public void testReleaseAcquireSameThread_tryAcquireTimedN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimedN); }
524	>	public void testReleaseAcquireSameThread(boolean fair,
525	>	final AcquireMethod acquirer) {
526	>	Semaphore s = new Semaphore(1, fair);
527	>	for (int i = 1; i < 6; i++) {
528	>	s.release(i);
529	>	assertEquals(1 + i, s.availablePermits());
530	>	try {
531	>	acquirer.acquire(s, i);
532	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
533		assertEquals(1, s.availablePermits());
532	–	} catch( InterruptedException e){
533	–	unexpectedException();
534	–	}
535	–	}
536	–
537	–	/**
538	–	* A release in one thread enables an acquire in another thread
539	–	*/
540	–	public void testAcquireReleaseInDifferentThreads_fair() {
541	–	final Semaphore s = new Semaphore(0, true);
542	–	Thread t = new Thread(new Runnable() {
543	–	public void run() {
544	–	try {
545	–	s.acquire();
546	–	s.acquire();
547	–	s.acquire();
548	–	s.acquire();
549	–	} catch(InterruptedException ie){
550	–	threadUnexpectedException();
551	–	}
552	–	}
553	–	});
554	–	try {
555	–	t.start();
556	–	Thread.sleep(SHORT_DELAY_MS);
557	–	s.release();
558	–	s.release();
559	–	s.release();
560	–	s.release();
561	–	s.release();
562	–	s.release();
563	–	t.join();
564	–	assertEquals(2, s.availablePermits());
565	–	} catch( InterruptedException e){
566	–	unexpectedException();
534		}
535		}
536
537		/**
538	<	* release(n) in one thread enables acquire(n) in another thread
538	>	* release in one thread enables acquire in another thread
539		*/
540	<	public void testAcquireReleaseNInDifferentThreads_fair() {
541	<	final Semaphore s = new Semaphore(0, true);
542	<	Thread t = new Thread(new Runnable() {
543	<	public void run() {
544	<	try {
545	<	s.acquire(2);
546	<	s.acquire(2);
547	<	s.release(4);
548	<	} catch(InterruptedException ie){
549	<	threadUnexpectedException();
550	<	}
551	<	}
552	<	});
553	<	try {
554	<	t.start();
555	<	Thread.sleep(SHORT_DELAY_MS);
556	<	s.release(6);
557	<	s.acquire(2);
558	<	s.acquire(2);
559	<	s.release(2);
560	<	t.join();
561	<	} catch( InterruptedException e){
562	<	unexpectedException();
563	<	}
564	<	}
565	<
566	<
567	<
568	<	/**
569	<	* release in one thread enables timed acquire in another thread
570	<	*/
571	<	public void testTimedAcquireReleaseInDifferentThreads_fair() {
572	<	final Semaphore s = new Semaphore(1, true);
573	<	Thread t = new Thread(new Runnable() {
574	<	public void run() {
608	<	try {
609	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
610	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
611	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
612	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
613	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
614	<
615	<	} catch(InterruptedException ie){
616	<	threadUnexpectedException();
617	<	}
618	<	}
619	<	});
620	<	t.start();
621	<	try {
622	<	s.release();
623	<	s.release();
624	<	s.release();
625	<	s.release();
626	<	s.release();
627	<	t.join();
628	<	} catch( InterruptedException e){
629	<	unexpectedException();
630	<	}
631	<	}
632	<
633	<	/**
634	<	* release(n) in one thread enables timed acquire(n) in another thread
635	<	*/
636	<	public void testTimedAcquireReleaseNInDifferentThreads_fair() {
637	<	final Semaphore s = new Semaphore(2, true);
638	<	Thread t = new Thread(new Runnable() {
639	<	public void run() {
640	<	try {
641	<	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
642	<	s.release(2);
643	<	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
644	<	s.release(2);
645	<	} catch(InterruptedException ie){
646	<	threadUnexpectedException();
647	<	}
648	<	}
649	<	});
650	<	t.start();
651	<	try {
652	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
653	<	s.release(2);
654	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
655	<	s.release(2);
656	<	t.join();
657	<	} catch( InterruptedException e){
658	<	unexpectedException();
659	<	}
660	<	}
661	<
662	<	/**
663	<	* A waiting acquire blocks interruptibly
664	<	*/
665	<	public void testAcquire_InterruptedException_fair() {
666	<	final Semaphore s = new Semaphore(0, true);
667	<	Thread t = new Thread(new Runnable() {
668	<	public void run() {
669	<	try {
670	<	s.acquire();
671	<	threadShouldThrow();
672	<	} catch(InterruptedException success){}
673	<	}
674	<	});
675	<	t.start();
676	<	try {
677	<	Thread.sleep(SHORT_DELAY_MS);
678	<	t.interrupt();
679	<	t.join();
680	<	} catch(InterruptedException e){
681	<	unexpectedException();
682	<	}
683	<	}
684	<
685	<	/**
686	<	* A waiting acquire(n) blocks interruptibly
687	<	*/
688	<	public void testAcquireN_InterruptedException_fair() {
689	<	final Semaphore s = new Semaphore(2, true);
690	<	Thread t = new Thread(new Runnable() {
691	<	public void run() {
692	<	try {
693	<	s.acquire(3);
694	<	threadShouldThrow();
695	<	} catch(InterruptedException success){}
696	<	}
697	<	});
698	<	t.start();
699	<	try {
700	<	Thread.sleep(SHORT_DELAY_MS);
701	<	t.interrupt();
702	<	t.join();
703	<	} catch(InterruptedException e){
704	<	unexpectedException();
705	<	}
706	<	}
707	<
708	<	/**
709	<	*  A waiting tryAcquire blocks interruptibly
710	<	*/
711	<	public void testTryAcquire_InterruptedException_fair() {
712	<	final Semaphore s = new Semaphore(0, true);
713	<	Thread t = new Thread(new Runnable() {
714	<	public void run() {
715	<	try {
716	<	s.tryAcquire(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
717	<	threadShouldThrow();
718	<	} catch(InterruptedException success){
719	<	}
720	<	}
721	<	});
722	<	t.start();
723	<	try {
724	<	Thread.sleep(SHORT_DELAY_MS);
725	<	t.interrupt();
726	<	t.join();
727	<	} catch(InterruptedException e){
728	<	unexpectedException();
729	<	}
730	<	}
731	<
732	<	/**
733	<	*  A waiting tryAcquire(n) blocks interruptibly
734	<	*/
735	<	public void testTryAcquireN_InterruptedException_fair() {
736	<	final Semaphore s = new Semaphore(1, true);
737	<	Thread t = new Thread(new Runnable() {
738	<	public void run() {
739	<	try {
740	<	s.tryAcquire(4, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
741	<	threadShouldThrow();
742	<	} catch(InterruptedException success){
743	<	}
744	<	}
745	<	});
746	<	t.start();
747	<	try {
748	<	Thread.sleep(SHORT_DELAY_MS);
749	<	t.interrupt();
750	<	t.join();
751	<	} catch(InterruptedException e){
752	<	unexpectedException();
540	>	public void testReleaseAcquireDifferentThreads_acquire()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquire); }
541	>	public void testReleaseAcquireDifferentThreads_acquire_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquire); }
542	>	public void testReleaseAcquireDifferentThreads_acquireN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireN); }
543	>	public void testReleaseAcquireDifferentThreads_acquireN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireN); }
544	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
545	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
546	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
547	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
548	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimed); }
549	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimed); }
550	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimedN); }
551	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimedN); }
552	>	public void testReleaseAcquireDifferentThreads(boolean fair,
553	>	final AcquireMethod acquirer) {
554	>	final Semaphore s = new Semaphore(0, fair);
555	>	final int rounds = 4;
556	>	long startTime = System.nanoTime();
557	>	Thread t = newStartedThread(new CheckedRunnable() {
558	>	public void realRun() throws InterruptedException {
559	>	for (int i = 0; i < rounds; i++) {
560	>	assertFalse(s.hasQueuedThreads());
561	>	if (i % 2 == 0)
562	>	acquirer.acquire(s);
563	>	else
564	>	acquirer.acquire(s, 3);
565	>	}}});
566	>
567	>	for (int i = 0; i < rounds; i++) {
568	>	while (! (s.availablePermits() == 0 && s.hasQueuedThreads()))
569	>	Thread.yield();
570	>	assertTrue(t.isAlive());
571	>	if (i % 2 == 0)
572	>	s.release();
573	>	else
574	>	s.release(3);
575		}
576	+	awaitTermination(t);
577	+	assertEquals(0, s.availablePermits());
578	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
579		}
580
581		/**
582	<	* getQueueLength reports number of waiting threads
758	<	*/
759	<	public void testGetQueueLength_fair() {
760	<	final Semaphore lock = new Semaphore(1, true);
761	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
762	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
763	<	try {
764	<	assertEquals(0, lock.getQueueLength());
765	<	lock.acquireUninterruptibly();
766	<	t1.start();
767	<	Thread.sleep(SHORT_DELAY_MS);
768	<	assertEquals(1, lock.getQueueLength());
769	<	t2.start();
770	<	Thread.sleep(SHORT_DELAY_MS);
771	<	assertEquals(2, lock.getQueueLength());
772	<	t1.interrupt();
773	<	Thread.sleep(SHORT_DELAY_MS);
774	<	assertEquals(1, lock.getQueueLength());
775	<	lock.release();
776	<	Thread.sleep(SHORT_DELAY_MS);
777	<	assertEquals(0, lock.getQueueLength());
778	<	t1.join();
779	<	t2.join();
780	<	} catch(Exception e){
781	<	unexpectedException();
782	<	}
783	<	}
784	<
785	<
786	<	/**
787	<	* a deserialized serialized semaphore has same number of permits
582	>	* fair locks are strictly FIFO
583		*/
584	<	public void testSerialization_fair() {
585	<	Semaphore l = new Semaphore(3, true);
586	<
587	<	try {
588	<	l.acquire();
589	<	l.release();
590	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
591	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
592	<	out.writeObject(l);
593	<	out.close();
594	<
595	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
596	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
597	<	Semaphore r = (Semaphore) in.readObject();
598	<	assertEquals(3, r.availablePermits());
599	<	assertTrue(r.isFair());
600	<	r.acquire();
601	<	r.release();
602	<	} catch(Exception e){
603	<	unexpectedException();
604	<	}
584	>	public void testFairLocksFifo() {
585	>	final PublicSemaphore s = new PublicSemaphore(1, true);
586	>	final CountDownLatch pleaseRelease = new CountDownLatch(1);
587	>	Thread t1 = newStartedThread(new CheckedRunnable() {
588	>	public void realRun() throws InterruptedException {
589	>	// Will block; permits are available, but not three
590	>	s.acquire(3);
591	>	}});
592	>
593	>	waitForQueuedThreads(s);
594	>
595	>	Thread t2 = newStartedThread(new CheckedRunnable() {
596	>	public void realRun() throws InterruptedException {
597	>	// Will fail, even though 1 permit is available
598	>	assertFalse(s.tryAcquire(0L, MILLISECONDS));
599	>	assertFalse(s.tryAcquire(1, 0L, MILLISECONDS));
600	>
601	>	// untimed tryAcquire will barge and succeed
602	>	assertTrue(s.tryAcquire());
603	>	s.release(2);
604	>	assertTrue(s.tryAcquire(2));
605	>	s.release();
606	>
607	>	pleaseRelease.countDown();
608	>	// Will queue up behind t1, even though 1 permit is available
609	>	s.acquire();
610	>	}});
611	>
612	>	await(pleaseRelease);
613	>	waitForQueuedThread(s, t2);
614	>	s.release(2);
615	>	awaitTermination(t1);
616	>	assertTrue(t2.isAlive());
617	>	s.release();
618	>	awaitTermination(t2);
619	>	}
620	>
621	>	/**
622	>	* toString indicates current number of permits
623	>	*/
624	>	public void testToString()      { testToString(false); }
625	>	public void testToString_fair() { testToString(true); }
626	>	public void testToString(boolean fair) {
627	>	PublicSemaphore s = new PublicSemaphore(0, fair);
628	>	assertTrue(s.toString().contains("Permits = 0"));
629	>	s.release();
630	>	assertTrue(s.toString().contains("Permits = 1"));
631	>	s.release(2);
632	>	assertTrue(s.toString().contains("Permits = 3"));
633	>	s.reducePermits(5);
634	>	assertTrue(s.toString().contains("Permits = -2"));
635		}
636
812	–
637		}

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