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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 1.43 by jsr166, Tue Jan 23 20:44:11 2018 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	>	import java.util.concurrent.ThreadLocalRandom;
15	>
16	>	import junit.framework.Test;
17	>	import junit.framework.TestSuite;
18
19		public class SemaphoreTest extends JSR166TestCase {
20		public static void main(String[] args) {
21	<	junit.textui.TestRunner.run (suite());
21	>	main(suite(), args);
22		}
23		public static Test suite() {
24	<	return new TestSuite(SemaphoreTest.class);
24	>	return new TestSuite(SemaphoreTest.class);
25		}
26
27		/**
28		* Subclass to expose protected methods
29		*/
30		static class PublicSemaphore extends Semaphore {
31	<	PublicSemaphore(int p, boolean f) { super(p, f); }
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 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
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 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() {
157	<	Semaphore s0 = new Semaphore(0, false);
158	<	assertEquals(0, s0.availablePermits());
159	<	assertFalse(s0.isFair());
160	<	Semaphore s1 = new Semaphore(-1, false);
161	<	assertEquals(-1, s1.availablePermits());
162	<	Semaphore s2 = new Semaphore(-1, false);
163	<	assertEquals(-1, s2.availablePermits());
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 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());
174	>	}
175		}
176
177		/**
178	<	* tryAcquire succeeds when sufficent permits, else fails
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	<	Semaphore s = new Semaphore(1, false);
198	<	try {
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	<	} catch( InterruptedException e){
211	<	unexpectedException();
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		}
108	–	}
273
274	<	/**
111	<	* Uninterruptible acquire and release of semaphore succeed if
112	<	* initially available
113	<	*/
114	<	public void testAcquireUninterruptiblyReleaseInSameThread() {
115	<	Semaphore s = new Semaphore(1, false);
116	<	try {
117	<	s.acquireUninterruptibly();
118	<	s.release();
119	<	s.acquireUninterruptibly();
120	<	s.release();
121	<	s.acquireUninterruptibly();
122	<	s.release();
123	<	s.acquireUninterruptibly();
124	<	s.release();
125	<	s.acquireUninterruptibly();
126	<	s.release();
127	<	assertEquals(1, s.availablePermits());
128	<	} finally {
129	<	}
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	<	Semaphore s = new Semaphore(1, false);
283	<	try {
284	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
285	<	s.release();
286	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
287	<	s.release();
288	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
289	<	s.release();
290	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
291	<	s.release();
292	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
293	<	s.release();
294	<	assertEquals(1, s.availablePermits());
295	<	} catch( InterruptedException e){
296	<	unexpectedException();
297	<	}
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	>	Thread t1 = newStartedThread(new CheckedRunnable() {
290	>	public void realRun() throws InterruptedException {
291	>	// Interrupt before acquire
292	>	pleaseInterrupt.release();
293	>	Thread.currentThread().interrupt();
294	>	acquirer.acquire(s);
295	>	assertTrue(Thread.interrupted());
296	>	}});
297	>
298	>	Thread t2 = newStartedThread(new CheckedRunnable() {
299	>	public void realRun() throws InterruptedException {
300	>	// Interrupt during acquire
301	>	pleaseInterrupt.release();
302	>	acquirer.acquire(s);
303	>	assertTrue(Thread.interrupted());
304	>	}});
305	>
306	>	await(pleaseInterrupt);
307	>	waitForQueuedThread(s, t1);
308	>	waitForQueuedThread(s, t2);
309	>	t2.interrupt();
310	>
311	>	assertThreadBlocks(t1, Thread.State.WAITING);
312	>	assertThreadBlocks(t2, Thread.State.WAITING);
313	>
314	>	s.release(2);
315	>
316	>	awaitTermination(t1);
317	>	awaitTermination(t2);
318	>	}
319	>
320	>	/**
321	>	* hasQueuedThreads reports whether there are waiting threads
322	>	*/
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	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
330	>	waitForQueuedThread(lock, t1);
331	>	assertTrue(lock.hasQueuedThreads());
332	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
333	>	waitForQueuedThread(lock, t2);
334	>	assertTrue(lock.hasQueuedThreads());
335	>	t1.interrupt();
336	>	awaitTermination(t1);
337	>	assertTrue(lock.hasQueuedThreads());
338	>	lock.release();
339	>	awaitTermination(t2);
340	>	assertFalse(lock.hasQueuedThreads());
341		}
342
343		/**
344	<	* A release in one thread enables an acquire in another thread
157	<	*/
158	<	public void testAcquireReleaseInDifferentThreads() {
159	<	final Semaphore s = new Semaphore(0, false);
160	<	Thread t = new Thread(new Runnable() {
161	<	public void run() {
162	<	try {
163	<	s.acquire();
164	<	s.release();
165	<	s.release();
166	<	s.acquire();
167	<	} catch(InterruptedException ie){
168	<	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	<	}
184	<	}
185	<
186	<	/**
187	<	* A release in one thread enables an uninterruptible acquire in another thread
344	>	* getQueueLength reports number of waiting threads
345		*/
346	<	public void testUninterruptibleAcquireReleaseInDifferentThreads() {
347	<	final Semaphore s = new Semaphore(0, false);
348	<	Thread t = new Thread(new Runnable() {
349	<	public void run() {
350	<	s.acquireUninterruptibly();
351	<	s.release();
352	<	s.release();
353	<	s.acquireUninterruptibly();
354	<	}
355	<	});
356	<	try {
357	<	t.start();
358	<	Thread.sleep(SHORT_DELAY_MS);
359	<	s.release();
360	<	s.release();
361	<	s.acquireUninterruptibly();
362	<	s.acquireUninterruptibly();
363	<	s.release();
207	<	t.join();
208	<	} catch( InterruptedException e){
209	<	unexpectedException();
210	<	}
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	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
353	>	waitForQueuedThread(lock, t1);
354	>	assertEquals(1, lock.getQueueLength());
355	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
356	>	waitForQueuedThread(lock, t2);
357	>	assertEquals(2, lock.getQueueLength());
358	>	t1.interrupt();
359	>	awaitTermination(t1);
360	>	assertEquals(1, lock.getQueueLength());
361	>	lock.release();
362	>	awaitTermination(t2);
363	>	assertEquals(0, lock.getQueueLength());
364		}
365
213	–
366		/**
367	<	*  A release in one thread enables a timed acquire in another thread
367	>	* getQueuedThreads includes waiting threads
368		*/
369	<	public void testTimedAcquireReleaseInDifferentThreads() {
370	<	final Semaphore s = new Semaphore(1, false);
371	<	Thread t = new Thread(new Runnable() {
372	<	public void run() {
373	<	try {
374	<	s.release();
375	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
376	<	s.release();
377	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
378	<
379	<	} catch(InterruptedException ie){
380	<	threadUnexpectedException();
381	<	}
382	<	}
383	<	});
384	<	try {
385	<	t.start();
386	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
387	<	s.release();
388	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
389	<	s.release();
238	<	s.release();
239	<	t.join();
240	<	} catch( InterruptedException e){
241	<	unexpectedException();
242	<	}
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	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
377	>	waitForQueuedThread(lock, t1);
378	>	assertTrue(lock.getQueuedThreads().contains(t1));
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	>	awaitTermination(t1);
385	>	assertFalse(lock.getQueuedThreads().contains(t1));
386	>	assertTrue(lock.getQueuedThreads().contains(t2));
387	>	lock.release();
388	>	awaitTermination(t2);
389	>	assertTrue(lock.getQueuedThreads().isEmpty());
390		}
391
392		/**
393	<	* A waiting acquire blocks interruptibly
394	<	*/
395	<	public void testAcquire_InterruptedException() {
396	<	final Semaphore s = new Semaphore(0, false);
397	<	Thread t = new Thread(new Runnable() {
398	<	public void run() {
399	<	try {
400	<	s.acquire();
401	<	threadShouldThrow();
402	<	} catch(InterruptedException success){}
403	<	}
404	<	});
405	<	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	<	}
393	>	* drainPermits reports and removes given number of permits
394	>	*/
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);
402	>	assertEquals(10, s.availablePermits());
403	>	assertEquals(10, s.drainPermits());
404	>	assertEquals(0, s.availablePermits());
405	>	assertEquals(0, s.drainPermits());
406		}
407
408		/**
409	<	* getQueueLength reports number of waiting threads
409	>	* release(-N) throws IllegalArgumentException
410		*/
411	<	public void testGetQueueLength() {
412	<	final Semaphore lock = new Semaphore(1, false);
413	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
414	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
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	<	assertEquals(0, lock.getQueueLength());
417	<	lock.acquireUninterruptibly();
418	<	t1.start();
419	<	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	<	}
416	>	s.release(-1);
417	>	shouldThrow();
418	>	} catch (IllegalArgumentException success) {}
419	>	}
420
421		/**
422	<	* getQueuedThreads includes waiting threads
422	>	* reducePermits(-N) throws IllegalArgumentException
423		*/
424	<	public void testGetQueuedThreads() {
425	<	final PublicSemaphore lock = new PublicSemaphore(1, false);
426	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
427	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
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	<	assertTrue(lock.getQueuedThreads().isEmpty());
430	<	lock.acquireUninterruptibly();
431	<	assertTrue(lock.getQueuedThreads().isEmpty());
432	<	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	<
429	>	s.reducePermits(-1);
430	>	shouldThrow();
431	>	} catch (IllegalArgumentException success) {}
432	>	}
433
434		/**
435		* reducePermits reduces number of permits
436		*/
437	<	public void testReducePermits() {
438	<	PublicSemaphore s = new PublicSemaphore(10, false);
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	<	* a deserialized serialized semaphore has same number of permits
456	<	*/
369	<	public void testSerialization() {
370	<	Semaphore l = new Semaphore(3, false);
371	<	try {
372	<	l.acquire();
373	<	l.release();
374	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
375	<	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	<	}
390	<
391	<
392	<	/**
393	<	* Zero, negative, and positive initial values are allowed in constructor
394	<	*/
395	<	public void testConstructor_fair() {
396	<	Semaphore s0 = new Semaphore(0, true);
397	<	assertEquals(0, s0.availablePermits());
398	<	assertTrue(s0.isFair());
399	<	Semaphore s1 = new Semaphore(-1, true);
400	<	assertEquals(-1, s1.availablePermits());
401	<	Semaphore s2 = new Semaphore(-1, true);
402	<	assertEquals(-1, s2.availablePermits());
403	<	}
404	<
405	<	/**
406	<	* tryAcquire succeeds when sufficent permits, else fails
407	<	*/
408	<	public void testTryAcquireInSameThread_fair() {
409	<	Semaphore s = new Semaphore(2, true);
410	<	assertEquals(2, s.availablePermits());
411	<	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);
422	<	assertEquals(2, s.availablePermits());
423	<	assertTrue(s.tryAcquire(2));
424	<	assertEquals(0, s.availablePermits());
425	<	assertFalse(s.tryAcquire());
426	<	}
427	<
428	<	/**
429	<	* Acquire and release of semaphore succeed if initially available
455	>	* a reserialized semaphore has same number of permits and
456	>	* fairness, but no queued threads
457		*/
458	<	public void testAcquireReleaseInSameThread_fair() {
459	<	Semaphore s = new Semaphore(1, true);
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();
435	–	s.release();
464		s.acquire();
465		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	–	}
466
467	<	/**
468	<	* Acquire(n) and release(n) of semaphore succeed if initially available
469	<	*/
470	<	public void testAcquireReleaseNInSameThread_fair() {
471	<	Semaphore s = new Semaphore(1, true);
472	<	try {
473	<	s.release(1);
474	<	s.acquire(1);
475	<	s.release(2);
476	<	s.acquire(2);
477	<	s.release(3);
478	<	s.acquire(3);
479	<	s.release(4);
480	<	s.acquire(4);
481	<	s.release(5);
482	<	s.acquire(5);
483	<	assertEquals(1, s.availablePermits());
484	<	} catch( InterruptedException e){
485	<	unexpectedException();
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	<	* Acquire(n) and release(n) of semaphore succeed if initially available
502	<	*/
503	<	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
504	<	Semaphore s = new Semaphore(1, true);
505	<	try {
506	<	s.release(1);
507	<	s.acquireUninterruptibly(1);
508	<	s.release(2);
509	<	s.acquireUninterruptibly(2);
510	<	s.release(3);
511	<	s.acquireUninterruptibly(3);
512	<	s.release(4);
513	<	s.acquireUninterruptibly(4);
514	<	s.release(5);
487	<	s.acquireUninterruptibly(5);
488	<	assertEquals(1, s.availablePermits());
489	<	} finally {
490	<	}
501	>	* tryAcquire(n) succeeds when sufficient permits, else fails
502	>	*/
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(1));
513	>	assertFalse(s.tryAcquire(2));
514	>	assertEquals(0, s.availablePermits());
515		}
516
517		/**
518	<	* release(n) in one thread enables timed acquire(n) in another thread
518	>	* acquire succeeds if permits available
519		*/
520	<	public void testTimedAcquireReleaseNInSameThread_fair() {
521	<	Semaphore s = new Semaphore(1, true);
522	<	try {
523	<	s.release(1);
524	<	assertTrue(s.tryAcquire(1, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
525	<	s.release(2);
526	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
527	<	s.release(3);
528	<	assertTrue(s.tryAcquire(3, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
529	<	s.release(4);
530	<	assertTrue(s.tryAcquire(4, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
531	<	s.release(5);
532	<	assertTrue(s.tryAcquire(5, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
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());
510	–	} catch( InterruptedException e){
511	–	unexpectedException();
546		}
547		}
548
549		/**
550	<	* release in one thread enables timed acquire in another thread
550	>	* release in one thread enables acquire in another thread
551		*/
552	<	public void testTimedAcquireReleaseInSameThread_fair() {
553	<	Semaphore s = new Semaphore(1, true);
554	<	try {
555	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
556	<	s.release();
557	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
558	<	s.release();
559	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
560	<	s.release();
561	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
562	<	s.release();
563	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
564	<	s.release();
565	<	assertEquals(1, s.availablePermits());
566	<	} catch( InterruptedException e){
567	<	unexpectedException();
568	<	}
569	<	}
570	<
571	<	/**
572	<	* A release in one thread enables an acquire in another thread
573	<	*/
574	<	public void testAcquireReleaseInDifferentThreads_fair() {
575	<	final Semaphore s = new Semaphore(0, true);
576	<	Thread t = new Thread(new Runnable() {
577	<	public void run() {
578	<	try {
579	<	s.acquire();
580	<	s.acquire();
581	<	s.acquire();
582	<	s.acquire();
583	<	} catch(InterruptedException ie){
584	<	threadUnexpectedException();
585	<	}
586	<	}
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();
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_fair() {
597	<	final Semaphore s = new Semaphore(0, true);
598	<	Thread t = new Thread(new Runnable() {
599	<	public void run() {
600	<	try {
601	<	s.acquire(2);
602	<	s.acquire(2);
603	<	s.release(4);
604	<	} catch(InterruptedException ie){
605	<	threadUnexpectedException();
606	<	}
607	<	}
608	<	});
609	<	try {
610	<	t.start();
611	<	Thread.sleep(SHORT_DELAY_MS);
612	<	s.release(6);
613	<	s.acquire(2);
614	<	s.acquire(2);
615	<	s.release(2);
616	<	t.join();
617	<	} catch( InterruptedException e){
618	<	unexpectedException();
619	<	}
620	<	}
621	<
622	<
623	<
624	<	/**
625	<	* release in one thread enables timed acquire in another thread
626	<	*/
627	<	public void testTimedAcquireReleaseInDifferentThreads_fair() {
628	<	final Semaphore s = new Semaphore(1, true);
629	<	Thread t = new Thread(new Runnable() {
630	<	public void run() {
631	<	try {
632	<	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();
753	<	}
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	>	// Will block; permits are available, but not three
602	>	s.acquire(3);
603	>	}});
604	>
605	>	waitForQueuedThread(s, t1);
606	>
607	>	Thread t2 = newStartedThread(new CheckedRunnable() {
608	>	public void realRun() throws InterruptedException {
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	>	// untimed tryAcquire will barge and succeed
616	>	assertTrue(s.tryAcquire());
617	>	s.release(2);
618	>	assertTrue(s.tryAcquire(2));
619	>	s.release();
620	>
621	>	pleaseRelease.countDown();
622	>	// Will queue up behind t1, even though 1 permit is available
623	>	s.acquire();
624	>	}});
625	>
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	<	* getQueueLength reports number of waiting threads
637	<	*/
638	<	public void testGetQueueLength_fair() {
639	<	final Semaphore lock = new Semaphore(1, true);
640	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
641	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
642	<	try {
643	<	assertEquals(0, lock.getQueueLength());
644	<	lock.acquireUninterruptibly();
645	<	t1.start();
646	<	Thread.sleep(SHORT_DELAY_MS);
647	<	assertEquals(1, lock.getQueueLength());
648	<	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
788	<	*/
789	<	public void testSerialization_fair() {
790	<	Semaphore l = new Semaphore(3, true);
791	<
792	<	try {
793	<	l.acquire();
794	<	l.release();
795	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
796	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
797	<	out.writeObject(l);
798	<	out.close();
799	<
800	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
801	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
802	<	Semaphore r = (Semaphore) in.readObject();
803	<	assertEquals(3, r.availablePermits());
804	<	assertTrue(r.isFair());
805	<	r.acquire();
806	<	r.release();
807	<	} catch(Exception e){
808	<	unexpectedException();
809	<	}
636	>	* toString indicates current number of permits
637	>	*/
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	>	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
812	–
651		}

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