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 1.22 by jsr166, Tue Dec 1 06:03:49 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);
#	Line 24 | Line 27 | public class SemaphoreTest extends JSR16
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 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	<	public void testConstructor() {
72	<	for (int permits : new int[] { -1, 0, 1 }) {
73	<	for (boolean fair : new boolean[] { false, true }) {
74	<	Semaphore s = new Semaphore(permits, fair);
75	<	assertEquals(permits, s.availablePermits());
76	<	assertEquals(fair, s.isFair());
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	>	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 86 | 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
193	>	* timed tryAcquire times out
194		*/
195	<	public void testAcquireReleaseInSameThread()
196	<	throws InterruptedException {
197	<	Semaphore s = new Semaphore(1, false);
198	<	s.acquire();
199	<	s.release();
200	<	s.acquire();
201	<	s.release();
202	<	s.acquire();
203	<	s.release();
204	<	s.acquire();
205	<	s.release();
206	<	s.acquire();
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	<	/**
118	<	* Uninterruptible acquire and release of semaphore succeed if
119	<	* initially available
120	<	*/
121	<	public void testAcquireUninterruptiblyReleaseInSameThread()
122	<	throws InterruptedException {
123	<	Semaphore s = new Semaphore(1, false);
124	<	s.acquireUninterruptibly();
125	<	s.release();
126	<	s.acquireUninterruptibly();
127	<	s.release();
128	<	s.acquireUninterruptibly();
129	<	s.release();
130	<	s.acquireUninterruptibly();
131	<	s.release();
132	<	s.acquireUninterruptibly();
133	<	s.release();
134	<	assertEquals(1, s.availablePermits());
271	>	awaitTermination(t);
272		}
273
274		/**
275	<	* Timed Acquire and release of semaphore succeed if
276	<	* initially available
275	>	* acquireUninterruptibly(), acquireUninterruptibly(N) are
276	>	* uninterruptible
277		*/
278	<	public void testTimedAcquireReleaseInSameThread()
279	<	throws InterruptedException {
280	<	Semaphore s = new Semaphore(1, false);
281	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
282	<	s.release();
283	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
284	<	s.release();
148	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
149	<	s.release();
150	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
151	<	s.release();
152	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
153	<	s.release();
154	<	assertEquals(1, s.availablePermits());
155	<	}
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	<	/**
158	<	* A release in one thread enables an acquire in another thread
159	<	*/
160	<	public void testAcquireReleaseInDifferentThreads()
161	<	throws InterruptedException {
162	<	final Semaphore s = new Semaphore(0, false);
163	<	Thread t = new Thread(new CheckedRunnable() {
286	>	Thread t1 = newStartedThread(new CheckedRunnable() {
287		public void realRun() throws InterruptedException {
288	<	s.acquire();
289	<	s.release();
290	<	s.release();
291	<	s.acquire();
288	>	// Interrupt before acquire
289	>	pleaseInterrupt.release();
290	>	Thread.currentThread().interrupt();
291	>	acquirer.acquire(s);
292	>	assertTrue(Thread.interrupted());
293		}});
294
295	<	t.start();
172	<	Thread.sleep(SHORT_DELAY_MS);
173	<	s.release();
174	<	s.release();
175	<	s.acquire();
176	<	s.acquire();
177	<	s.release();
178	<	t.join();
179	<	}
180	<
181	<	/**
182	<	* A release in one thread enables an uninterruptible acquire in another thread
183	<	*/
184	<	public void testUninterruptibleAcquireReleaseInDifferentThreads()
185	<	throws InterruptedException {
186	<	final Semaphore s = new Semaphore(0, false);
187	<	Thread t = new Thread(new CheckedRunnable() {
188	<	public void realRun() throws InterruptedException {
189	<	s.acquireUninterruptibly();
190	<	s.release();
191	<	s.release();
192	<	s.acquireUninterruptibly();
193	<	}});
194	<
195	<	t.start();
196	<	Thread.sleep(SHORT_DELAY_MS);
197	<	s.release();
198	<	s.release();
199	<	s.acquireUninterruptibly();
200	<	s.acquireUninterruptibly();
201	<	s.release();
202	<	t.join();
203	<	}
204	<
205	<
206	<	/**
207	<	*  A release in one thread enables a timed acquire in another thread
208	<	*/
209	<	public void testTimedAcquireReleaseInDifferentThreads()
210	<	throws InterruptedException {
211	<	final Semaphore s = new Semaphore(1, false);
212	<	Thread t = new Thread(new CheckedRunnable() {
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));
224	<	s.release();
225	<	s.release();
226	<	t.join();
227	<	}
228	<
229	<	/**
230	<	* A waiting acquire blocks interruptibly
231	<	*/
232	<	public void testAcquire_InterruptedException()
233	<	throws InterruptedException {
234	<	final Semaphore s = new Semaphore(0, false);
235	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
236	<	public void realRun() throws InterruptedException {
237	<	s.acquire();
238	<	}});
303	>	await(pleaseInterrupt);
304	>	waitForQueuedThread(s, t1);
305	>	waitForQueuedThread(s, t2);
306	>	t2.interrupt();
307
308	<	t.start();
309	<	Thread.sleep(SHORT_DELAY_MS);
242	<	t.interrupt();
243	<	t.join();
244	<	}
308	>	assertThreadBlocks(t1, Thread.State.WAITING);
309	>	assertThreadBlocks(t2, Thread.State.WAITING);
310
311	<	/**
247	<	*  A waiting timed acquire blocks interruptibly
248	<	*/
249	<	public void testTryAcquire_InterruptedException()
250	<	throws InterruptedException {
251	<	final Semaphore s = new Semaphore(0, false);
252	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
253	<	public void realRun() throws InterruptedException {
254	<	s.tryAcquire(MEDIUM_DELAY_MS, MILLISECONDS);
255	<	}});
311	>	s.release(2);
312
313	<	t.start();
314	<	Thread.sleep(SHORT_DELAY_MS);
259	<	t.interrupt();
260	<	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());
284	–	t1.join();
285	–	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());
309	–	t1.join();
310	–	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());
337	–	t1.join();
338	–	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 353 | 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();
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();
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
388	–
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	<
425	<	/**
426	<	* Acquire and release of semaphore succeed if initially available
427	<	*/
428	<	public void testAcquireReleaseInSameThread_fair()
429	<	throws InterruptedException {
430	<	Semaphore s = new Semaphore(1, true);
431	<	s.acquire();
432	<	s.release();
433	<	s.acquire();
434	<	s.release();
435	<	s.acquire();
436	<	s.release();
437	<	s.acquire();
438	<	s.release();
439	<	s.acquire();
440	<	s.release();
441	<	assertEquals(1, s.availablePermits());
442	<	}
443	<
444	<	/**
445	<	* Acquire(n) and release(n) of semaphore succeed if initially available
446	<	*/
447	<	public void testAcquireReleaseNInSameThread_fair()
448	<	throws InterruptedException {
449	<	Semaphore s = new Semaphore(1, true);
450	<	s.release(1);
451	<	s.acquire(1);
452	<	s.release(2);
453	<	s.acquire(2);
454	<	s.release(3);
455	<	s.acquire(3);
456	<	s.release(4);
457	<	s.acquire(4);
458	<	s.release(5);
459	<	s.acquire(5);
460	<	assertEquals(1, s.availablePermits());
461	<	}
462	<
463	<	/**
464	<	* Acquire(n) and release(n) of semaphore succeed if initially available
465	<	*/
466	<	public void testAcquireUninterruptiblyReleaseNInSameThread_fair() {
467	<	Semaphore s = new Semaphore(1, true);
468	<	s.release(1);
469	<	s.acquireUninterruptibly(1);
470	<	s.release(2);
471	<	s.acquireUninterruptibly(2);
472	<	s.release(3);
473	<	s.acquireUninterruptibly(3);
474	<	s.release(4);
475	<	s.acquireUninterruptibly(4);
476	<	s.release(5);
477	<	s.acquireUninterruptibly(5);
478	<	assertEquals(1, s.availablePermits());
479	<	}
480	<
481	<	/**
482	<	* release(n) in one thread enables timed acquire(n) in another thread
483	<	*/
484	<	public void testTimedAcquireReleaseNInSameThread_fair()
485	<	throws InterruptedException {
486	<	Semaphore s = new Semaphore(1, true);
487	<	s.release(1);
488	<	assertTrue(s.tryAcquire(1, SHORT_DELAY_MS, MILLISECONDS));
489	<	s.release(2);
490	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
491	<	s.release(3);
492	<	assertTrue(s.tryAcquire(3, SHORT_DELAY_MS, MILLISECONDS));
493	<	s.release(4);
494	<	assertTrue(s.tryAcquire(4, SHORT_DELAY_MS, MILLISECONDS));
495	<	s.release(5);
496	<	assertTrue(s.tryAcquire(5, SHORT_DELAY_MS, MILLISECONDS));
497	<	assertEquals(1, s.availablePermits());
498	<	}
499	<
500	<	/**
501	<	* release in one thread enables timed acquire in another thread
502	<	*/
503	<	public void testTimedAcquireReleaseInSameThread_fair()
504	<	throws InterruptedException {
505	<	Semaphore s = new Semaphore(1, true);
506	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
507	<	s.release();
508	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
509	<	s.release();
510	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
511	<	s.release();
512	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
513	<	s.release();
514	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
515	<	s.release();
516	<	assertEquals(1, s.availablePermits());
509	>	assertFalse(s.tryAcquire(1));
510	>	assertFalse(s.tryAcquire(2));
511	>	assertEquals(0, s.availablePermits());
512		}
513
514		/**
515	<	* A release in one thread enables an acquire in another thread
515	>	* acquire succeeds if permits available
516		*/
517	<	public void testAcquireReleaseInDifferentThreads_fair()
518	<	throws InterruptedException {
519	<	final Semaphore s = new Semaphore(0, true);
520	<	Thread t = new Thread(new CheckedRunnable() {
521	<	public void realRun() throws InterruptedException {
522	<	s.acquire();
523	<	s.acquire();
524	<	s.acquire();
525	<	s.acquire();
526	<	}});
527	<
528	<	t.start();
529	<	Thread.sleep(SHORT_DELAY_MS);
530	<	s.release();
531	<	s.release();
532	<	s.release();
533	<	s.release();
534	<	s.release();
535	<	s.release();
536	<	t.join();
537	<	assertEquals(2, 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	<	* release(n) in one thread enables acquire(n) in another thread
547	>	* release in one thread enables acquire in another thread
548		*/
549	<	public void testAcquireReleaseNInDifferentThreads_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.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();
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_fair2()
594	<	throws InterruptedException {
595	<	final Semaphore s = new Semaphore(0, true);
596	<	Thread t = new Thread(new CheckedRunnable() {
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	<	s.acquire(2);
599	<	s.acquire(2);
576	<	s.release(4);
598	>	// Will block; permits are available, but not three
599	>	s.acquire(3);
600		}});
601
602	<	t.start();
580	<	Thread.sleep(SHORT_DELAY_MS);
581	<	s.release(6);
582	<	s.acquire(2);
583	<	s.acquire(2);
584	<	s.release(2);
585	<	t.join();
586	<	}
602	>	waitForQueuedThread(s, t1);
603
604	<
589	<	/**
590	<	* release in one thread enables timed acquire in another thread
591	<	*/
592	<	public void testTimedAcquireReleaseInDifferentThreads_fair()
593	<	throws InterruptedException {
594	<	final Semaphore s = new Semaphore(1, true);
595	<	Thread t = new Thread(new CheckedRunnable() {
604	>	Thread t2 = newStartedThread(new CheckedRunnable() {
605		public void realRun() throws InterruptedException {
606	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
607	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
608	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
609	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
610	<	threadAssertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
602	<	}});
603	<
604	<	t.start();
605	<	s.release();
606	<	s.release();
607	<	s.release();
608	<	s.release();
609	<	s.release();
610	<	t.join();
611	<	}
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
615	<	*/
616	<	public void testTimedAcquireReleaseNInDifferentThreads_fair()
617	<	throws InterruptedException {
618	<	final Semaphore s = new Semaphore(2, true);
619	<	Thread t = new Thread(new CheckedRunnable() {
620	<	public void realRun() throws InterruptedException {
621	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
612	>	// untimed tryAcquire will barge and succeed
613	>	assertTrue(s.tryAcquire());
614		s.release(2);
615	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
616	<	s.release(2);
625	<	}});
626	<
627	<	t.start();
628	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
629	<	s.release(2);
630	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
631	<	s.release(2);
632	<	t.join();
633	<	}
615	>	assertTrue(s.tryAcquire(2));
616	>	s.release();
617
618	<	/**
619	<	* A waiting acquire blocks interruptibly
637	<	*/
638	<	public void testAcquire_InterruptedException_fair()
639	<	throws InterruptedException {
640	<	final Semaphore s = new Semaphore(0, true);
641	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
642	<	public void realRun() throws InterruptedException {
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	<	/**
653	<	* A waiting acquire(n) blocks interruptibly
654	<	*/
655	<	public void testAcquireN_InterruptedException_fair()
656	<	throws InterruptedException {
657	<	final Semaphore s = new Semaphore(2, true);
658	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
659	<	public void realRun() throws InterruptedException {
660	<	s.acquire(3);
661	<	}});
662	<
663	<	t.start();
664	<	Thread.sleep(SHORT_DELAY_MS);
665	<	t.interrupt();
666	<	t.join();
667	<	}
668	<
669	<	/**
670	<	*  A waiting tryAcquire blocks interruptibly
671	<	*/
672	<	public void testTryAcquire_InterruptedException_fair()
673	<	throws InterruptedException {
674	<	final Semaphore s = new Semaphore(0, true);
675	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
676	<	public void realRun() throws InterruptedException {
677	<	s.tryAcquire(MEDIUM_DELAY_MS, MILLISECONDS);
678	<	}});
679	<
680	<	t.start();
681	<	Thread.sleep(SHORT_DELAY_MS);
682	<	t.interrupt();
683	<	t.join();
684	<	}
685	<
686	<	/**
687	<	*  A waiting tryAcquire(n) blocks interruptibly
688	<	*/
689	<	public void testTryAcquireN_InterruptedException_fair()
690	<	throws InterruptedException {
691	<	final Semaphore s = new Semaphore(1, true);
692	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
693	<	public void realRun() throws InterruptedException {
694	<	s.tryAcquire(4, MEDIUM_DELAY_MS, MILLISECONDS);
695	<	}});
696	<
697	<	t.start();
698	<	Thread.sleep(SHORT_DELAY_MS);
699	<	t.interrupt();
700	<	t.join();
701	<	}
702	<
703	<	/**
704	<	* getQueueLength reports number of waiting threads
705	<	*/
706	<	public void testGetQueueLength_fair() throws InterruptedException {
707	<	final Semaphore lock = new Semaphore(1, true);
708	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
709	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
710	<	assertEquals(0, lock.getQueueLength());
711	<	lock.acquireUninterruptibly();
712	<	t1.start();
713	<	Thread.sleep(SHORT_DELAY_MS);
714	<	assertEquals(1, lock.getQueueLength());
715	<	t2.start();
716	<	Thread.sleep(SHORT_DELAY_MS);
717	<	assertEquals(2, lock.getQueueLength());
718	<	t1.interrupt();
719	<	Thread.sleep(SHORT_DELAY_MS);
720	<	assertEquals(1, lock.getQueueLength());
721	<	lock.release();
722	<	Thread.sleep(SHORT_DELAY_MS);
723	<	assertEquals(0, lock.getQueueLength());
724	<	t1.join();
725	<	t2.join();
726	<	}
727	<
728	<
729	<	/**
730	<	* a deserialized serialized semaphore has same number of permits
731	<	*/
732	<	public void testSerialization_fair() throws Exception {
733	<	Semaphore l = new Semaphore(3, true);
734	<
735	<	l.acquire();
736	<	l.release();
737	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
738	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
739	<	out.writeObject(l);
740	<	out.close();
741	<
742	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
743	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
744	<	Semaphore r = (Semaphore) in.readObject();
745	<	assertEquals(3, r.availablePermits());
746	<	assertTrue(r.isFair());
747	<	r.acquire();
748	<	r.release();
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);
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 s1 = s.toString();
642	<	assertTrue(s1.indexOf("Permits = 1") >= 0);
643	<	s.release();
644	<	String s2 = s.toString();
645	<	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