ViewVC Help

View File | Revision Log | Show Annotations | Download File | Root Listing

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

Comparing jsr166/src/test/tck/SemaphoreTest.java (file contents):
Revision 1.19 by jsr166, Tue Nov 17 02:22:50 2009 UTC vs.
Revision 1.45 by jsr166, Tue Aug 13 00:46:27 2019 UTC

#	Line 1 | Line 1
1		/*
2		* Written by Doug Lea with assistance from members of JCP JSR-166
3		* Expert Group and released to the public domain, as explained at
4	<	* http://creativecommons.org/licenses/publicdomain
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5		* Other contributors include Andrew Wright, Jeffrey Hayes,
6		* Pat Fisher, Mike Judd.
7		*/
8
9	–	import junit.framework.*;
10	–	import java.util.*;
11	–	import java.util.concurrent.*;
9		import static java.util.concurrent.TimeUnit.MILLISECONDS;
10	<	import java.io.*;
10	>
11	>	import java.util.Collection;
12	>	import java.util.concurrent.CountDownLatch;
13	>	import java.util.concurrent.Semaphore;
14	>
15	>	import junit.framework.Test;
16	>	import junit.framework.TestSuite;
17
18		public class SemaphoreTest extends JSR166TestCase {
19		public static void main(String[] args) {
20	<	junit.textui.TestRunner.run (suite());
20	>	main(suite(), args);
21		}
22		public static Test suite() {
23	<	return new TestSuite(SemaphoreTest.class);
23	>	return new TestSuite(SemaphoreTest.class);
24		}
25
26		/**
27		* Subclass to expose protected methods
28		*/
29		static class PublicSemaphore extends Semaphore {
30	<	PublicSemaphore(int p, boolean f) { super(p, f); }
30	>	PublicSemaphore(int permits) { super(permits); }
31	>	PublicSemaphore(int permits, boolean fair) { super(permits, fair); }
32		public Collection<Thread> getQueuedThreads() {
33		return super.getQueuedThreads();
34		}
35	<	public void reducePermits(int p) {
36	<	super.reducePermits(p);
35	>	public boolean hasQueuedThread(Thread t) {
36	>	return super.getQueuedThreads().contains(t);
37	>	}
38	>	public void reducePermits(int reduction) {
39	>	super.reducePermits(reduction);
40		}
41		}
42
#	Line 38 | Line 45 | public class SemaphoreTest extends JSR16
45		*/
46		class InterruptibleLockRunnable extends CheckedRunnable {
47		final Semaphore lock;
48	<	InterruptibleLockRunnable(Semaphore l) { lock = l; }
48	>	InterruptibleLockRunnable(Semaphore s) { lock = s; }
49		public void realRun() {
50		try {
51		lock.acquire();
#	Line 47 | Line 54 | public class SemaphoreTest extends JSR16
54		}
55		}
56
50	–
57		/**
58	<	* A runnable calling acquire that expects to be
53	<	* interrupted
58	>	* A runnable calling acquire that expects to be interrupted
59		*/
60		class InterruptedLockRunnable extends CheckedInterruptedRunnable {
61		final Semaphore lock;
62	<	InterruptedLockRunnable(Semaphore l) { lock = l; }
62	>	InterruptedLockRunnable(Semaphore s) { lock = s; }
63		public void realRun() throws InterruptedException {
64		lock.acquire();
65		}
66		}
67
68		/**
69	<	* Zero, negative, and positive initial values are allowed in constructor
69	>	* Spin-waits until s.hasQueuedThread(t) becomes true.
70	>	*/
71	>	void waitForQueuedThread(PublicSemaphore s, Thread t) {
72	>	long startTime = System.nanoTime();
73	>	while (!s.hasQueuedThread(t)) {
74	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
75	>	throw new AssertionError("timed out");
76	>	Thread.yield();
77	>	}
78	>	assertTrue(s.hasQueuedThreads());
79	>	assertTrue(t.isAlive());
80	>	}
81	>
82	>	/**
83	>	* Spin-waits until s.hasQueuedThreads() becomes true.
84		*/
85	<	public void testConstructor() {
86	<	for (int permits : new int[] { -1, 0, 1 }) {
87	<	for (boolean fair : new boolean[] { false, true }) {
88	<	Semaphore s = new Semaphore(permits, fair);
89	<	assertEquals(permits, s.availablePermits());
90	<	assertEquals(fair, s.isFair());
85	>	void waitForQueuedThreads(Semaphore s) {
86	>	long startTime = System.nanoTime();
87	>	while (!s.hasQueuedThreads()) {
88	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
89	>	throw new AssertionError("timed out");
90	>	Thread.yield();
91	>	}
92	>	}
93	>
94	>	enum AcquireMethod {
95	>	acquire() {
96	>	void acquire(Semaphore s) throws InterruptedException {
97	>	s.acquire();
98	>	}
99	>	},
100	>	acquireN() {
101	>	void acquire(Semaphore s, int permits) throws InterruptedException {
102	>	s.acquire(permits);
103	>	}
104	>	},
105	>	acquireUninterruptibly() {
106	>	void acquire(Semaphore s) {
107	>	s.acquireUninterruptibly();
108	>	}
109	>	},
110	>	acquireUninterruptiblyN() {
111	>	void acquire(Semaphore s, int permits) {
112	>	s.acquireUninterruptibly(permits);
113	>	}
114	>	},
115	>	tryAcquire() {
116	>	void acquire(Semaphore s) {
117	>	assertTrue(s.tryAcquire());
118	>	}
119	>	},
120	>	tryAcquireN() {
121	>	void acquire(Semaphore s, int permits) {
122	>	assertTrue(s.tryAcquire(permits));
123		}
124	+	},
125	+	tryAcquireTimed() {
126	+	void acquire(Semaphore s) throws InterruptedException {
127	+	assertTrue(s.tryAcquire(2 * LONG_DELAY_MS, MILLISECONDS));
128	+	}
129	+	Thread.State parkedState() { return Thread.State.TIMED_WAITING; }
130	+	},
131	+	tryAcquireTimedN {
132	+	void acquire(Semaphore s, int permits) throws InterruptedException {
133	+	assertTrue(s.tryAcquire(permits, 2 * LONG_DELAY_MS, MILLISECONDS));
134	+	}
135	+	Thread.State parkedState() { return Thread.State.TIMED_WAITING; }
136	+	};
137	+
138	+	// Intentionally meta-circular
139	+
140	+	/** Acquires 1 permit. */
141	+	void acquire(Semaphore s) throws InterruptedException {
142	+	acquire(s, 1);
143	+	}
144	+	/** Acquires the given number of permits. */
145	+	void acquire(Semaphore s, int permits) throws InterruptedException {
146	+	for (int i = 0; i < permits; i++)
147	+	acquire(s);
148	+	}
149	+	Thread.State parkedState() { return Thread.State.WAITING; }
150	+	}
151	+
152	+	/**
153	+	* Zero, negative, and positive initial values are allowed in constructor
154	+	*/
155	+	public void testConstructor()      { testConstructor(false); }
156	+	public void testConstructor_fair() { testConstructor(true); }
157	+	public void testConstructor(boolean fair) {
158	+	for (int permits : new int[] { -42, -1, 0, 1, 42 }) {
159	+	Semaphore s = new Semaphore(permits, fair);
160	+	assertEquals(permits, s.availablePermits());
161	+	assertEquals(fair, s.isFair());
162		}
163		}
164
165		/**
166		* Constructor without fairness argument behaves as nonfair
167		*/
168	<	public void testConstructor2() {
169	<	for (int permits : new int[] { -1, 0, 1 }) {
168	>	public void testConstructorDefaultsToNonFair() {
169	>	for (int permits : new int[] { -42, -1, 0, 1, 42 }) {
170		Semaphore s = new Semaphore(permits);
171		assertEquals(permits, s.availablePermits());
172		assertFalse(s.isFair());
#	Line 87 | Line 176 | public class SemaphoreTest extends JSR16
176		/**
177		* tryAcquire succeeds when sufficient permits, else fails
178		*/
179	<	public void testTryAcquireInSameThread() {
180	<	Semaphore s = new Semaphore(2, false);
179	>	public void testTryAcquireInSameThread()      { testTryAcquireInSameThread(false); }
180	>	public void testTryAcquireInSameThread_fair() { testTryAcquireInSameThread(true); }
181	>	public void testTryAcquireInSameThread(boolean fair) {
182	>	Semaphore s = new Semaphore(2, fair);
183		assertEquals(2, s.availablePermits());
184		assertTrue(s.tryAcquire());
185		assertTrue(s.tryAcquire());
186		assertEquals(0, s.availablePermits());
187		assertFalse(s.tryAcquire());
188	+	assertFalse(s.tryAcquire());
189	+	assertEquals(0, s.availablePermits());
190		}
191
192		/**
193	<	* Acquire and release of semaphore succeed if initially available
101	<	*/
102	<	public void testAcquireReleaseInSameThread()
103	<	throws InterruptedException {
104	<	Semaphore s = new Semaphore(1, false);
105	<	s.acquire();
106	<	s.release();
107	<	s.acquire();
108	<	s.release();
109	<	s.acquire();
110	<	s.release();
111	<	s.acquire();
112	<	s.release();
113	<	s.acquire();
114	<	s.release();
115	<	assertEquals(1, s.availablePermits());
116	<	}
117	<
118	<	/**
119	<	* Uninterruptible acquire and release of semaphore succeed if
120	<	* initially available
193	>	* timed tryAcquire times out
194		*/
195	<	public void testAcquireUninterruptiblyReleaseInSameThread()
196	<	throws InterruptedException {
197	<	Semaphore s = new Semaphore(1, false);
198	<	s.acquireUninterruptibly();
199	<	s.release();
200	<	s.acquireUninterruptibly();
201	<	s.release();
202	<	s.acquireUninterruptibly();
203	<	s.release();
204	<	s.acquireUninterruptibly();
205	<	s.release();
206	<	s.acquireUninterruptibly();
207	<	s.release();
208	<	assertEquals(1, s.availablePermits());
209	<	}
195	>	public void testTryAcquire_timeout() throws InterruptedException {
196	>	final boolean fair = randomBoolean();
197	>	final Semaphore s = new Semaphore(0, fair);
198	>	final long startTime = System.nanoTime();
199	>	assertFalse(s.tryAcquire(timeoutMillis(), MILLISECONDS));
200	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
201	>	}
202	>
203	>	/**
204	>	* timed tryAcquire(N) times out
205	>	*/
206	>	public void testTryAcquireN_timeout() throws InterruptedException {
207	>	final boolean fair = randomBoolean();
208	>	final Semaphore s = new Semaphore(2, fair);
209	>	final long startTime = System.nanoTime();
210	>	assertFalse(s.tryAcquire(3, timeoutMillis(), MILLISECONDS));
211	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
212	>	}
213	>
214	>	/**
215	>	* acquire(), acquire(N), timed tryAcquired, timed tryAcquire(N)
216	>	* are interruptible
217	>	*/
218	>	public void testInterruptible_acquire()               { testInterruptible(false, AcquireMethod.acquire); }
219	>	public void testInterruptible_acquire_fair()          { testInterruptible(true,  AcquireMethod.acquire); }
220	>	public void testInterruptible_acquireN()              { testInterruptible(false, AcquireMethod.acquireN); }
221	>	public void testInterruptible_acquireN_fair()         { testInterruptible(true,  AcquireMethod.acquireN); }
222	>	public void testInterruptible_tryAcquireTimed()       { testInterruptible(false, AcquireMethod.tryAcquireTimed); }
223	>	public void testInterruptible_tryAcquireTimed_fair()  { testInterruptible(true,  AcquireMethod.tryAcquireTimed); }
224	>	public void testInterruptible_tryAcquireTimedN()      { testInterruptible(false, AcquireMethod.tryAcquireTimedN); }
225	>	public void testInterruptible_tryAcquireTimedN_fair() { testInterruptible(true,  AcquireMethod.tryAcquireTimedN); }
226	>	public void testInterruptible(boolean fair, final AcquireMethod acquirer) {
227	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
228	>	final java.util.concurrent.CyclicBarrier pleaseInterrupt
229	>	= new java.util.concurrent.CyclicBarrier(2);
230	>	Thread t = newStartedThread(new CheckedRunnable() {
231	>	public void realRun() {
232	>	// Interrupt before acquire
233	>	Thread.currentThread().interrupt();
234	>	try {
235	>	acquirer.acquire(s);
236	>	shouldThrow();
237	>	} catch (InterruptedException success) {}
238	>	assertFalse(Thread.interrupted());
239	>
240	>	// Interrupt before acquire(N)
241	>	Thread.currentThread().interrupt();
242	>	try {
243	>	acquirer.acquire(s, 3);
244	>	shouldThrow();
245	>	} catch (InterruptedException success) {}
246	>	assertFalse(Thread.interrupted());
247	>
248	>	// Interrupt during acquire
249	>	await(pleaseInterrupt);
250	>	try {
251	>	acquirer.acquire(s);
252	>	shouldThrow();
253	>	} catch (InterruptedException success) {}
254	>	assertFalse(Thread.interrupted());
255	>
256	>	// Interrupt during acquire(N)
257	>	await(pleaseInterrupt);
258	>	try {
259	>	acquirer.acquire(s, 3);
260	>	shouldThrow();
261	>	} catch (InterruptedException success) {}
262	>	assertFalse(Thread.interrupted());
263	>	}});
264	>
265	>	for (int n = 2; n-->0; ) {
266	>	await(pleaseInterrupt);
267	>	assertThreadBlocks(t, acquirer.parkedState());
268	>	t.interrupt();
269	>	}
270
271	<	/**
139	<	* Timed Acquire and release of semaphore succeed if
140	<	* initially available
141	<	*/
142	<	public void testTimedAcquireReleaseInSameThread()
143	<	throws InterruptedException {
144	<	Semaphore s = new Semaphore(1, false);
145	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
146	<	s.release();
147	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
148	<	s.release();
149	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
150	<	s.release();
151	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
152	<	s.release();
153	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
154	<	s.release();
155	<	assertEquals(1, s.availablePermits());
271	>	awaitTermination(t);
272		}
273
274		/**
275	<	* A release in one thread enables an acquire in another thread
275	>	* acquireUninterruptibly(), acquireUninterruptibly(N) are
276	>	* uninterruptible
277		*/
278	<	public void testAcquireReleaseInDifferentThreads()
279	<	throws InterruptedException {
280	<	final Semaphore s = new Semaphore(0, false);
281	<	Thread t = new Thread(new CheckedRunnable() {
282	<	public void realRun() throws InterruptedException {
283	<	s.acquire();
284	<	s.release();
168	<	s.release();
169	<	s.acquire();
170	<	}});
278	>	public void testUninterruptible_acquireUninterruptibly()       { testUninterruptible(false, AcquireMethod.acquireUninterruptibly); }
279	>	public void testUninterruptible_acquireUninterruptibly_fair()  { testUninterruptible(true,  AcquireMethod.acquireUninterruptibly); }
280	>	public void testUninterruptible_acquireUninterruptiblyN()      { testUninterruptible(false, AcquireMethod.acquireUninterruptiblyN); }
281	>	public void testUninterruptible_acquireUninterruptiblyN_fair() { testUninterruptible(true,  AcquireMethod.acquireUninterruptiblyN); }
282	>	public void testUninterruptible(boolean fair, final AcquireMethod acquirer) {
283	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
284	>	final Semaphore pleaseInterrupt = new Semaphore(-1, fair);
285
286	<	t.start();
173	<	Thread.sleep(SHORT_DELAY_MS);
174	<	s.release();
175	<	s.release();
176	<	s.acquire();
177	<	s.acquire();
178	<	s.release();
179	<	t.join();
180	<	}
181	<
182	<	/**
183	<	* A release in one thread enables an uninterruptible acquire in another thread
184	<	*/
185	<	public void testUninterruptibleAcquireReleaseInDifferentThreads()
186	<	throws InterruptedException {
187	<	final Semaphore s = new Semaphore(0, false);
188	<	Thread t = new Thread(new CheckedRunnable() {
286	>	Thread t1 = newStartedThread(new CheckedRunnable() {
287		public void realRun() throws InterruptedException {
288	<	s.acquireUninterruptibly();
289	<	s.release();
290	<	s.release();
291	<	s.acquireUninterruptibly();
288	>	// Interrupt before acquire
289	>	pleaseInterrupt.release();
290	>	Thread.currentThread().interrupt();
291	>	acquirer.acquire(s);
292	>	assertTrue(Thread.interrupted());
293		}});
294
295	<	t.start();
197	<	Thread.sleep(SHORT_DELAY_MS);
198	<	s.release();
199	<	s.release();
200	<	s.acquireUninterruptibly();
201	<	s.acquireUninterruptibly();
202	<	s.release();
203	<	t.join();
204	<	}
205	<
206	<
207	<	/**
208	<	*  A release in one thread enables a timed acquire in another thread
209	<	*/
210	<	public void testTimedAcquireReleaseInDifferentThreads()
211	<	throws InterruptedException {
212	<	final Semaphore s = new Semaphore(1, false);
213	<	Thread t = new Thread(new CheckedRunnable() {
295	>	Thread t2 = newStartedThread(new CheckedRunnable() {
296		public void realRun() throws InterruptedException {
297	<	s.release();
298	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
299	<	s.release();
300	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
297	>	// Interrupt during acquire
298	>	pleaseInterrupt.release();
299	>	acquirer.acquire(s);
300	>	assertTrue(Thread.interrupted());
301		}});
302
303	<	t.start();
304	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
305	<	s.release();
306	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
225	<	s.release();
226	<	s.release();
227	<	t.join();
228	<	}
303	>	await(pleaseInterrupt);
304	>	waitForQueuedThread(s, t1);
305	>	waitForQueuedThread(s, t2);
306	>	t2.interrupt();
307
308	<	/**
309	<	* A waiting acquire blocks interruptibly
232	<	*/
233	<	public void testAcquire_InterruptedException()
234	<	throws InterruptedException {
235	<	final Semaphore s = new Semaphore(0, false);
236	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
237	<	public void realRun() throws InterruptedException {
238	<	s.acquire();
239	<	}});
308	>	assertThreadBlocks(t1, Thread.State.WAITING);
309	>	assertThreadBlocks(t2, Thread.State.WAITING);
310
311	<	t.start();
242	<	Thread.sleep(SHORT_DELAY_MS);
243	<	t.interrupt();
244	<	t.join();
245	<	}
246	<
247	<	/**
248	<	*  A waiting timed acquire blocks interruptibly
249	<	*/
250	<	public void testTryAcquire_InterruptedException()
251	<	throws InterruptedException {
252	<	final Semaphore s = new Semaphore(0, false);
253	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
254	<	public void realRun() throws InterruptedException {
255	<	s.tryAcquire(MEDIUM_DELAY_MS, MILLISECONDS);
256	<	}});
311	>	s.release(2);
312
313	<	t.start();
314	<	Thread.sleep(SHORT_DELAY_MS);
260	<	t.interrupt();
261	<	t.join();
313	>	awaitTermination(t1);
314	>	awaitTermination(t2);
315		}
316
317		/**
318		* hasQueuedThreads reports whether there are waiting threads
319		*/
320	<	public void testHasQueuedThreads() throws InterruptedException {
321	<	final Semaphore lock = new Semaphore(1, false);
322	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
323	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
320	>	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
321	>	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
322	>	public void testHasQueuedThreads(boolean fair) {
323	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
324		assertFalse(lock.hasQueuedThreads());
325		lock.acquireUninterruptibly();
326	<	t1.start();
327	<	Thread.sleep(SHORT_DELAY_MS);
326	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
327	>	waitForQueuedThread(lock, t1);
328		assertTrue(lock.hasQueuedThreads());
329	<	t2.start();
330	<	Thread.sleep(SHORT_DELAY_MS);
329	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
330	>	waitForQueuedThread(lock, t2);
331		assertTrue(lock.hasQueuedThreads());
332		t1.interrupt();
333	<	Thread.sleep(SHORT_DELAY_MS);
333	>	awaitTermination(t1);
334		assertTrue(lock.hasQueuedThreads());
335		lock.release();
336	<	Thread.sleep(SHORT_DELAY_MS);
336	>	awaitTermination(t2);
337		assertFalse(lock.hasQueuedThreads());
285	–	t1.join();
286	–	t2.join();
338		}
339
340		/**
341		* getQueueLength reports number of waiting threads
342		*/
343	<	public void testGetQueueLength() throws InterruptedException {
344	<	final Semaphore lock = new Semaphore(1, false);
345	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
346	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
343	>	public void testGetQueueLength()      { testGetQueueLength(false); }
344	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
345	>	public void testGetQueueLength(boolean fair) {
346	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
347		assertEquals(0, lock.getQueueLength());
348		lock.acquireUninterruptibly();
349	<	t1.start();
350	<	Thread.sleep(SHORT_DELAY_MS);
349	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
350	>	waitForQueuedThread(lock, t1);
351		assertEquals(1, lock.getQueueLength());
352	<	t2.start();
353	<	Thread.sleep(SHORT_DELAY_MS);
352	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
353	>	waitForQueuedThread(lock, t2);
354		assertEquals(2, lock.getQueueLength());
355		t1.interrupt();
356	<	Thread.sleep(SHORT_DELAY_MS);
356	>	awaitTermination(t1);
357		assertEquals(1, lock.getQueueLength());
358		lock.release();
359	<	Thread.sleep(SHORT_DELAY_MS);
359	>	awaitTermination(t2);
360		assertEquals(0, lock.getQueueLength());
310	–	t1.join();
311	–	t2.join();
361		}
362
363		/**
364		* getQueuedThreads includes waiting threads
365		*/
366	<	public void testGetQueuedThreads() throws InterruptedException {
367	<	final PublicSemaphore lock = new PublicSemaphore(1, false);
368	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
369	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
366	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
367	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
368	>	public void testGetQueuedThreads(boolean fair) {
369	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
370		assertTrue(lock.getQueuedThreads().isEmpty());
371		lock.acquireUninterruptibly();
372		assertTrue(lock.getQueuedThreads().isEmpty());
373	<	t1.start();
374	<	Thread.sleep(SHORT_DELAY_MS);
373	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
374	>	waitForQueuedThread(lock, t1);
375		assertTrue(lock.getQueuedThreads().contains(t1));
376	<	t2.start();
377	<	Thread.sleep(SHORT_DELAY_MS);
376	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
377	>	waitForQueuedThread(lock, t2);
378		assertTrue(lock.getQueuedThreads().contains(t1));
379		assertTrue(lock.getQueuedThreads().contains(t2));
380		t1.interrupt();
381	<	Thread.sleep(SHORT_DELAY_MS);
381	>	awaitTermination(t1);
382		assertFalse(lock.getQueuedThreads().contains(t1));
383		assertTrue(lock.getQueuedThreads().contains(t2));
384		lock.release();
385	<	Thread.sleep(SHORT_DELAY_MS);
385	>	awaitTermination(t2);
386		assertTrue(lock.getQueuedThreads().isEmpty());
338	–	t1.join();
339	–	t2.join();
387		}
388
389		/**
390		* drainPermits reports and removes given number of permits
391		*/
392	<	public void testDrainPermits() {
393	<	Semaphore s = new Semaphore(0, false);
392	>	public void testDrainPermits()      { testDrainPermits(false); }
393	>	public void testDrainPermits_fair() { testDrainPermits(true); }
394	>	public void testDrainPermits(boolean fair) {
395	>	Semaphore s = new Semaphore(0, fair);
396		assertEquals(0, s.availablePermits());
397		assertEquals(0, s.drainPermits());
398		s.release(10);
#	Line 354 | Line 403 | public class SemaphoreTest extends JSR16
403		}
404
405		/**
406	<	* reducePermits reduces number of permits
406	>	* release(-N) throws IllegalArgumentException
407		*/
408	<	public void testReducePermits() {
409	<	PublicSemaphore s = new PublicSemaphore(10, false);
410	<	assertEquals(10, s.availablePermits());
411	<	s.reducePermits(1);
412	<	assertEquals(9, s.availablePermits());
413	<	s.reducePermits(10);
414	<	assertEquals(-1, s.availablePermits());
408	>	public void testReleaseIAE()      { testReleaseIAE(false); }
409	>	public void testReleaseIAE_fair() { testReleaseIAE(true); }
410	>	public void testReleaseIAE(boolean fair) {
411	>	Semaphore s = new Semaphore(10, fair);
412	>	try {
413	>	s.release(-1);
414	>	shouldThrow();
415	>	} catch (IllegalArgumentException success) {}
416		}
417
418		/**
419	<	* a deserialized serialized semaphore has same number of permits
420	<	*/
421	<	public void testSerialization() throws Exception {
422	<	Semaphore l = new Semaphore(3, false);
423	<	l.acquire();
424	<	l.release();
425	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
426	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
427	<	out.writeObject(l);
428	<	out.close();
379	<
380	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
381	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
382	<	Semaphore r = (Semaphore) in.readObject();
383	<	assertEquals(3, r.availablePermits());
384	<	assertFalse(r.isFair());
385	<	r.acquire();
386	<	r.release();
419	>	* reducePermits(-N) throws IllegalArgumentException
420	>	*/
421	>	public void testReducePermitsIAE()      { testReducePermitsIAE(false); }
422	>	public void testReducePermitsIAE_fair() { testReducePermitsIAE(true); }
423	>	public void testReducePermitsIAE(boolean fair) {
424	>	PublicSemaphore s = new PublicSemaphore(10, fair);
425	>	try {
426	>	s.reducePermits(-1);
427	>	shouldThrow();
428	>	} catch (IllegalArgumentException success) {}
429		}
430
389	–
431		/**
432	<	* Zero, negative, and positive initial values are allowed in constructor
432	>	* reducePermits reduces number of permits
433		*/
434	<	public void testConstructor_fair() {
435	<	Semaphore s0 = new Semaphore(0, true);
436	<	assertEquals(0, s0.availablePermits());
437	<	assertTrue(s0.isFair());
438	<	Semaphore s1 = new Semaphore(-1, true);
439	<	assertEquals(-1, s1.availablePermits());
440	<	Semaphore s2 = new Semaphore(-1, true);
441	<	assertEquals(-1, s2.availablePermits());
434	>	public void testReducePermits()      { testReducePermits(false); }
435	>	public void testReducePermits_fair() { testReducePermits(true); }
436	>	public void testReducePermits(boolean fair) {
437	>	PublicSemaphore s = new PublicSemaphore(10, fair);
438	>	assertEquals(10, s.availablePermits());
439	>	s.reducePermits(0);
440	>	assertEquals(10, s.availablePermits());
441	>	s.reducePermits(1);
442	>	assertEquals(9, s.availablePermits());
443	>	s.reducePermits(10);
444	>	assertEquals(-1, s.availablePermits());
445	>	s.reducePermits(10);
446	>	assertEquals(-11, s.availablePermits());
447	>	s.reducePermits(0);
448	>	assertEquals(-11, s.availablePermits());
449		}
450
451		/**
452	<	* tryAcquire succeeds when sufficient permits, else fails
453	<	*/
454	<	public void testTryAcquireInSameThread_fair() {
455	<	Semaphore s = new Semaphore(2, true);
456	<	assertEquals(2, s.availablePermits());
457	<	assertTrue(s.tryAcquire());
458	<	assertTrue(s.tryAcquire());
459	<	assertEquals(0, s.availablePermits());
460	<	assertFalse(s.tryAcquire());
452	>	* a reserialized semaphore has same number of permits and
453	>	* fairness, but no queued threads
454	>	*/
455	>	public void testSerialization()      { testSerialization(false); }
456	>	public void testSerialization_fair() { testSerialization(true); }
457	>	public void testSerialization(boolean fair) {
458	>	try {
459	>	Semaphore s = new Semaphore(3, fair);
460	>	s.acquire();
461	>	s.acquire();
462	>	s.release();
463	>
464	>	Semaphore clone = serialClone(s);
465	>	assertEquals(fair, s.isFair());
466	>	assertEquals(fair, clone.isFair());
467	>	assertEquals(2, s.availablePermits());
468	>	assertEquals(2, clone.availablePermits());
469	>	clone.acquire();
470	>	clone.acquire();
471	>	clone.release();
472	>	assertEquals(2, s.availablePermits());
473	>	assertEquals(1, clone.availablePermits());
474	>	assertFalse(s.hasQueuedThreads());
475	>	assertFalse(clone.hasQueuedThreads());
476	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
477	>
478	>	{
479	>	PublicSemaphore s = new PublicSemaphore(0, fair);
480	>	Thread t = newStartedThread(new InterruptibleLockRunnable(s));
481	>	// waitForQueuedThreads(s); // suffers from "flicker", so ...
482	>	waitForQueuedThread(s, t);  // ... we use this instead
483	>	PublicSemaphore clone = serialClone(s);
484	>	assertEquals(fair, s.isFair());
485	>	assertEquals(fair, clone.isFair());
486	>	assertEquals(0, s.availablePermits());
487	>	assertEquals(0, clone.availablePermits());
488	>	assertTrue(s.hasQueuedThreads());
489	>	assertFalse(clone.hasQueuedThreads());
490	>	s.release();
491	>	awaitTermination(t);
492	>	assertFalse(s.hasQueuedThreads());
493	>	assertFalse(clone.hasQueuedThreads());
494	>	}
495		}
496
497		/**
498		* tryAcquire(n) succeeds when sufficient permits, else fails
499		*/
500	<	public void testTryAcquireNInSameThread_fair() {
501	<	Semaphore s = new Semaphore(2, true);
500	>	public void testTryAcquireNInSameThread()      { testTryAcquireNInSameThread(false); }
501	>	public void testTryAcquireNInSameThread_fair() { testTryAcquireNInSameThread(true); }
502	>	public void testTryAcquireNInSameThread(boolean fair) {
503	>	Semaphore s = new Semaphore(2, fair);
504	>	assertEquals(2, s.availablePermits());
505	>	assertFalse(s.tryAcquire(3));
506		assertEquals(2, s.availablePermits());
507		assertTrue(s.tryAcquire(2));
508		assertEquals(0, s.availablePermits());
509	<	assertFalse(s.tryAcquire());
510	<	}
511	<
426	<	/**
427	<	* Acquire and release of semaphore succeed if initially available
428	<	*/
429	<	public void testAcquireReleaseInSameThread_fair()
430	<	throws InterruptedException {
431	<	Semaphore s = new Semaphore(1, true);
432	<	s.acquire();
433	<	s.release();
434	<	s.acquire();
435	<	s.release();
436	<	s.acquire();
437	<	s.release();
438	<	s.acquire();
439	<	s.release();
440	<	s.acquire();
441	<	s.release();
442	<	assertEquals(1, s.availablePermits());
509	>	assertFalse(s.tryAcquire(1));
510	>	assertFalse(s.tryAcquire(2));
511	>	assertEquals(0, s.availablePermits());
512		}
513
514		/**
515	<	* Acquire(n) and release(n) of semaphore succeed if initially available
515	>	* acquire succeeds if permits available
516		*/
517	<	public void testAcquireReleaseNInSameThread_fair()
518	<	throws InterruptedException {
519	<	Semaphore s = new Semaphore(1, true);
520	<	s.release(1);
521	<	s.acquire(1);
522	<	s.release(2);
523	<	s.acquire(2);
524	<	s.release(3);
525	<	s.acquire(3);
526	<	s.release(4);
527	<	s.acquire(4);
528	<	s.release(5);
529	<	s.acquire(5);
530	<	assertEquals(1, s.availablePermits());
531	<	}
532	<
533	<	/**
534	<	* Acquire(n) and release(n) of semaphore succeed if initially available
535	<	*/
536	<	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
537	<	Semaphore s = new Semaphore(1, true);
538	<	s.release(1);
539	<	s.acquireUninterruptibly(1);
540	<	s.release(2);
541	<	s.acquireUninterruptibly(2);
542	<	s.release(3);
543	<	s.acquireUninterruptibly(3);
475	<	s.release(4);
476	<	s.acquireUninterruptibly(4);
477	<	s.release(5);
478	<	s.acquireUninterruptibly(5);
479	<	assertEquals(1, s.availablePermits());
480	<	}
481	<
482	<	/**
483	<	* release(n) in one thread enables timed acquire(n) in another thread
484	<	*/
485	<	public void testTimedAcquireReleaseNInSameThread_fair()
486	<	throws InterruptedException {
487	<	Semaphore s = new Semaphore(1, true);
488	<	s.release(1);
489	<	assertTrue(s.tryAcquire(1, SHORT_DELAY_MS, MILLISECONDS));
490	<	s.release(2);
491	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
492	<	s.release(3);
493	<	assertTrue(s.tryAcquire(3, SHORT_DELAY_MS, MILLISECONDS));
494	<	s.release(4);
495	<	assertTrue(s.tryAcquire(4, SHORT_DELAY_MS, MILLISECONDS));
496	<	s.release(5);
497	<	assertTrue(s.tryAcquire(5, SHORT_DELAY_MS, MILLISECONDS));
498	<	assertEquals(1, s.availablePermits());
499	<	}
500	<
501	<	/**
502	<	* release in one thread enables timed acquire in another thread
503	<	*/
504	<	public void testTimedAcquireReleaseInSameThread_fair()
505	<	throws InterruptedException {
506	<	Semaphore s = new Semaphore(1, true);
507	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
508	<	s.release();
509	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
510	<	s.release();
511	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
512	<	s.release();
513	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
514	<	s.release();
515	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
516	<	s.release();
517	<	assertEquals(1, s.availablePermits());
517	>	public void testReleaseAcquireSameThread_acquire()       { testReleaseAcquireSameThread(false, AcquireMethod.acquire); }
518	>	public void testReleaseAcquireSameThread_acquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquire); }
519	>	public void testReleaseAcquireSameThread_acquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireN); }
520	>	public void testReleaseAcquireSameThread_acquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireN); }
521	>	public void testReleaseAcquireSameThread_acquireUninterruptibly()       { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
522	>	public void testReleaseAcquireSameThread_acquireUninterruptibly_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
523	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
524	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
525	>	public void testReleaseAcquireSameThread_tryAcquire()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquire); }
526	>	public void testReleaseAcquireSameThread_tryAcquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquire); }
527	>	public void testReleaseAcquireSameThread_tryAcquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireN); }
528	>	public void testReleaseAcquireSameThread_tryAcquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireN); }
529	>	public void testReleaseAcquireSameThread_tryAcquireTimed()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimed); }
530	>	public void testReleaseAcquireSameThread_tryAcquireTimed_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimed); }
531	>	public void testReleaseAcquireSameThread_tryAcquireTimedN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimedN); }
532	>	public void testReleaseAcquireSameThread_tryAcquireTimedN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimedN); }
533	>	public void testReleaseAcquireSameThread(boolean fair,
534	>	final AcquireMethod acquirer) {
535	>	Semaphore s = new Semaphore(1, fair);
536	>	for (int i = 1; i < 6; i++) {
537	>	s.release(i);
538	>	assertEquals(1 + i, s.availablePermits());
539	>	try {
540	>	acquirer.acquire(s, i);
541	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
542	>	assertEquals(1, s.availablePermits());
543	>	}
544		}
545
546		/**
547	<	* A release in one thread enables an acquire in another thread
547	>	* release in one thread enables acquire in another thread
548		*/
549	<	public void testAcquireReleaseInDifferentThreads_fair()
550	<	throws InterruptedException {
551	<	final Semaphore s = new Semaphore(0, true);
552	<	Thread t = new Thread(new CheckedRunnable() {
553	<	public void realRun() throws InterruptedException {
554	<	s.acquire();
555	<	s.acquire();
556	<	s.acquire();
557	<	s.acquire();
558	<	}});
559	<
560	<	t.start();
561	<	Thread.sleep(SHORT_DELAY_MS);
562	<	s.release();
563	<	s.release();
564	<	s.release();
565	<	s.release();
566	<	s.release();
567	<	s.release();
568	<	t.join();
569	<	assertEquals(2, s.availablePermits());
549	>	public void testReleaseAcquireDifferentThreads_acquire()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquire); }
550	>	public void testReleaseAcquireDifferentThreads_acquire_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquire); }
551	>	public void testReleaseAcquireDifferentThreads_acquireN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireN); }
552	>	public void testReleaseAcquireDifferentThreads_acquireN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireN); }
553	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
554	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
555	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
556	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
557	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimed); }
558	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimed); }
559	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimedN); }
560	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimedN); }
561	>	public void testReleaseAcquireDifferentThreads(boolean fair,
562	>	final AcquireMethod acquirer) {
563	>	final Semaphore s = new Semaphore(0, fair);
564	>	final int rounds = 4;
565	>	long startTime = System.nanoTime();
566	>	Thread t = newStartedThread(new CheckedRunnable() {
567	>	public void realRun() throws InterruptedException {
568	>	for (int i = 0; i < rounds; i++) {
569	>	assertFalse(s.hasQueuedThreads());
570	>	if (i % 2 == 0)
571	>	acquirer.acquire(s);
572	>	else
573	>	acquirer.acquire(s, 3);
574	>	}}});
575	>
576	>	for (int i = 0; i < rounds; i++) {
577	>	while (! (s.availablePermits() == 0 && s.hasQueuedThreads()))
578	>	Thread.yield();
579	>	assertTrue(t.isAlive());
580	>	if (i % 2 == 0)
581	>	s.release();
582	>	else
583	>	s.release(3);
584	>	}
585	>	awaitTermination(t);
586	>	assertEquals(0, s.availablePermits());
587	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
588		}
589
590		/**
591	<	* release(n) in one thread enables acquire(n) in another thread
591	>	* fair locks are strictly FIFO
592		*/
593	<	public void testAcquireReleaseNInDifferentThreads_fair()
594	<	throws InterruptedException {
595	<	final Semaphore s = new Semaphore(0, true);
596	<	Thread t = new Thread(new CheckedRunnable() {
597	<	public void realRun() throws InterruptedException {
598	<	s.acquire();
599	<	s.release(2);
556	<	s.acquire();
557	<	}});
558	<
559	<	t.start();
560	<	Thread.sleep(SHORT_DELAY_MS);
561	<	s.release(2);
562	<	s.acquire(2);
563	<	s.release(1);
564	<	t.join();
565	<	}
566	<
567	<	/**
568	<	* release(n) in one thread enables acquire(n) in another thread
569	<	*/
570	<	public void testAcquireReleaseNInDifferentThreads_fair2()
571	<	throws InterruptedException {
572	<	final Semaphore s = new Semaphore(0, true);
573	<	Thread t = new Thread(new CheckedRunnable() {
574	<	public void realRun() throws InterruptedException {
575	<	s.acquire(2);
576	<	s.acquire(2);
577	<	s.release(4);
593	>	public void testFairLocksFifo() {
594	>	final PublicSemaphore s = new PublicSemaphore(1, true);
595	>	final CountDownLatch pleaseRelease = new CountDownLatch(1);
596	>	Thread t1 = newStartedThread(new CheckedRunnable() {
597	>	public void realRun() throws InterruptedException {
598	>	// Will block; permits are available, but not three
599	>	s.acquire(3);
600		}});
601
602	<	t.start();
581	<	Thread.sleep(SHORT_DELAY_MS);
582	<	s.release(6);
583	<	s.acquire(2);
584	<	s.acquire(2);
585	<	s.release(2);
586	<	t.join();
587	<	}
588	<
589	<
590	<	/**
591	<	* release in one thread enables timed acquire in another thread
592	<	*/
593	<	public void testTimedAcquireReleaseInDifferentThreads_fair()
594	<	throws InterruptedException {
595	<	final Semaphore s = new Semaphore(1, true);
596	<	Thread t = new Thread(new CheckedRunnable() {
597	<	public void realRun() throws InterruptedException {
598	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
599	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
600	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
601	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
602	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
603	<	}});
602	>	waitForQueuedThread(s, t1);
603
604	<	t.start();
605	<	s.release();
606	<	s.release();
607	<	s.release();
608	<	s.release();
609	<	s.release();
610	<	t.join();
612	<	}
604	>	Thread t2 = newStartedThread(new CheckedRunnable() {
605	>	public void realRun() throws InterruptedException {
606	>	// Will fail, even though 1 permit is available
607	>	assertFalse(
608	>	s.tryAcquire(randomExpiredTimeout(), randomTimeUnit()));
609	>	assertFalse(
610	>	s.tryAcquire(1, randomExpiredTimeout(), randomTimeUnit()));
611
612	<	/**
613	<	* release(n) in one thread enables timed acquire(n) in another thread
616	<	*/
617	<	public void testTimedAcquireReleaseNInDifferentThreads_fair()
618	<	throws InterruptedException {
619	<	final Semaphore s = new Semaphore(2, true);
620	<	Thread t = new Thread(new CheckedRunnable() {
621	<	public void realRun() throws InterruptedException {
622	<	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
612	>	// untimed tryAcquire will barge and succeed
613	>	assertTrue(s.tryAcquire());
614		s.release(2);
615	<	threadAssertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
616	<	s.release(2);
626	<	}});
627	<
628	<	t.start();
629	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
630	<	s.release(2);
631	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
632	<	s.release(2);
633	<	t.join();
634	<	}
615	>	assertTrue(s.tryAcquire(2));
616	>	s.release();
617
618	<	/**
619	<	* A waiting acquire blocks interruptibly
638	<	*/
639	<	public void testAcquire_InterruptedException_fair()
640	<	throws InterruptedException {
641	<	final Semaphore s = new Semaphore(0, true);
642	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
643	<	public void realRun() throws InterruptedException {
618	>	pleaseRelease.countDown();
619	>	// Will queue up behind t1, even though 1 permit is available
620		s.acquire();
621		}});
622
623	<	t.start();
624	<	Thread.sleep(SHORT_DELAY_MS);
625	<	t.interrupt();
626	<	t.join();
627	<	}
628	<
629	<	/**
654	<	* A waiting acquire(n) blocks interruptibly
655	<	*/
656	<	public void testAcquireN_InterruptedException_fair()
657	<	throws InterruptedException {
658	<	final Semaphore s = new Semaphore(2, true);
659	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
660	<	public void realRun() throws InterruptedException {
661	<	s.acquire(3);
662	<	}});
663	<
664	<	t.start();
665	<	Thread.sleep(SHORT_DELAY_MS);
666	<	t.interrupt();
667	<	t.join();
668	<	}
669	<
670	<	/**
671	<	*  A waiting tryAcquire blocks interruptibly
672	<	*/
673	<	public void testTryAcquire_InterruptedException_fair()
674	<	throws InterruptedException {
675	<	final Semaphore s = new Semaphore(0, true);
676	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
677	<	public void realRun() throws InterruptedException {
678	<	s.tryAcquire(MEDIUM_DELAY_MS, MILLISECONDS);
679	<	}});
680	<
681	<	t.start();
682	<	Thread.sleep(SHORT_DELAY_MS);
683	<	t.interrupt();
684	<	t.join();
685	<	}
686	<
687	<	/**
688	<	*  A waiting tryAcquire(n) blocks interruptibly
689	<	*/
690	<	public void testTryAcquireN_InterruptedException_fair()
691	<	throws InterruptedException {
692	<	final Semaphore s = new Semaphore(1, true);
693	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
694	<	public void realRun() throws InterruptedException {
695	<	s.tryAcquire(4, MEDIUM_DELAY_MS, MILLISECONDS);
696	<	}});
697	<
698	<	t.start();
699	<	Thread.sleep(SHORT_DELAY_MS);
700	<	t.interrupt();
701	<	t.join();
702	<	}
703	<
704	<	/**
705	<	* getQueueLength reports number of waiting threads
706	<	*/
707	<	public void testGetQueueLength_fair() throws InterruptedException {
708	<	final Semaphore lock = new Semaphore(1, true);
709	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
710	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
711	<	assertEquals(0, lock.getQueueLength());
712	<	lock.acquireUninterruptibly();
713	<	t1.start();
714	<	Thread.sleep(SHORT_DELAY_MS);
715	<	assertEquals(1, lock.getQueueLength());
716	<	t2.start();
717	<	Thread.sleep(SHORT_DELAY_MS);
718	<	assertEquals(2, lock.getQueueLength());
719	<	t1.interrupt();
720	<	Thread.sleep(SHORT_DELAY_MS);
721	<	assertEquals(1, lock.getQueueLength());
722	<	lock.release();
723	<	Thread.sleep(SHORT_DELAY_MS);
724	<	assertEquals(0, lock.getQueueLength());
725	<	t1.join();
726	<	t2.join();
727	<	}
728	<
729	<
730	<	/**
731	<	* a deserialized serialized semaphore has same number of permits
732	<	*/
733	<	public void testSerialization_fair() throws Exception {
734	<	Semaphore l = new Semaphore(3, true);
735	<
736	<	l.acquire();
737	<	l.release();
738	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
739	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
740	<	out.writeObject(l);
741	<	out.close();
742	<
743	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
744	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
745	<	Semaphore r = (Semaphore) in.readObject();
746	<	assertEquals(3, r.availablePermits());
747	<	assertTrue(r.isFair());
748	<	r.acquire();
749	<	r.release();
623	>	await(pleaseRelease);
624	>	waitForQueuedThread(s, t2);
625	>	s.release(2);
626	>	awaitTermination(t1);
627	>	assertTrue(t2.isAlive());
628	>	s.release();
629	>	awaitTermination(t2);
630		}
631
632		/**
633		* toString indicates current number of permits
634		*/
635	<	public void testToString() {
636	<	Semaphore s = new Semaphore(0);
637	<	String us = s.toString();
638	<	assertTrue(us.indexOf("Permits = 0") >= 0);
639	<	s.release();
760	<	String s1 = s.toString();
761	<	assertTrue(s1.indexOf("Permits = 1") >= 0);
635	>	public void testToString()      { testToString(false); }
636	>	public void testToString_fair() { testToString(true); }
637	>	public void testToString(boolean fair) {
638	>	PublicSemaphore s = new PublicSemaphore(0, fair);
639	>	assertTrue(s.toString().contains("Permits = 0"));
640		s.release();
641	<	String s2 = s.toString();
642	<	assertTrue(s2.indexOf("Permits = 2") >= 0);
641	>	assertTrue(s.toString().contains("Permits = 1"));
642	>	s.release(2);
643	>	assertTrue(s.toString().contains("Permits = 3"));
644	>	s.reducePermits(5);
645	>	assertTrue(s.toString().contains("Permits = -2"));
646		}
647
648		}

Diff Legend

–	Removed lines
+	Added lines
<	Changed lines
>	Changed lines