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

Comparing jsr166/src/test/tck/SemaphoreTest.java (file contents):
Revision 1.27 by dl, Fri May 6 11:22:07 2011 UTC vs.
Revision 1.28 by jsr166, Tue May 24 23:43:14 2011 UTC

#	Line 24 | Line 24 | public class SemaphoreTest extends JSR16
24		* Subclass to expose protected methods
25		*/
26		static class PublicSemaphore extends Semaphore {
27	<	PublicSemaphore(int p, boolean f) { super(p, f); }
27	>	PublicSemaphore(int permits) { super(permits); }
28	>	PublicSemaphore(int permits, boolean fair) { super(permits, fair); }
29		public Collection<Thread> getQueuedThreads() {
30		return super.getQueuedThreads();
31		}
32	<	public void reducePermits(int p) {
33	<	super.reducePermits(p);
32	>	public boolean hasQueuedThread(Thread t) {
33	>	return super.getQueuedThreads().contains(t);
34	>	}
35	>	public void reducePermits(int reduction) {
36	>	super.reducePermits(reduction);
37		}
38		}
39
#	Line 38 | Line 42 | public class SemaphoreTest extends JSR16
42		*/
43		class InterruptibleLockRunnable extends CheckedRunnable {
44		final Semaphore lock;
45	<	InterruptibleLockRunnable(Semaphore l) { lock = l; }
45	>	InterruptibleLockRunnable(Semaphore s) { lock = s; }
46		public void realRun() {
47		try {
48		lock.acquire();
#	Line 47 | Line 51 | public class SemaphoreTest extends JSR16
51		}
52		}
53
50	–
54		/**
55		* A runnable calling acquire that expects to be interrupted
56		*/
57		class InterruptedLockRunnable extends CheckedInterruptedRunnable {
58		final Semaphore lock;
59	<	InterruptedLockRunnable(Semaphore l) { lock = l; }
59	>	InterruptedLockRunnable(Semaphore s) { lock = s; }
60		public void realRun() throws InterruptedException {
61		lock.acquire();
62		}
63		}
64
65		/**
66	<	* Zero, negative, and positive initial values are allowed in constructor
66	>	* Spin-waits until s.hasQueuedThread(t) becomes true.
67		*/
68	<	public void testConstructor() {
69	<	for (int permits : new int[] { -1, 0, 1 }) {
70	<	for (boolean fair : new boolean[] { false, true }) {
71	<	Semaphore s = new Semaphore(permits, fair);
72	<	assertEquals(permits, s.availablePermits());
73	<	assertEquals(fair, s.isFair());
68	>	void waitForQueuedThread(PublicSemaphore s, Thread t) {
69	>	long startTime = System.nanoTime();
70	>	while (!s.hasQueuedThread(t)) {
71	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
72	>	throw new AssertionFailedError("timed out");
73	>	Thread.yield();
74	>	}
75	>	assert(s.hasQueuedThreads());
76	>	assertTrue(t.isAlive());
77	>	}
78	>
79	>	/**
80	>	* Spin-waits until s.hasQueuedThreads() becomes true.
81	>	*/
82	>	void waitForQueuedThreads(Semaphore s) {
83	>	long startTime = System.nanoTime();
84	>	while (!s.hasQueuedThreads()) {
85	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
86	>	throw new AssertionFailedError("timed out");
87	>	Thread.yield();
88	>	}
89	>	}
90	>
91	>	enum AcquireMethod {
92	>	acquire() {
93	>	void acquire(Semaphore s) throws InterruptedException {
94	>	s.acquire();
95	>	}
96	>	},
97	>	acquireN() {
98	>	void acquire(Semaphore s, int permits) throws InterruptedException {
99	>	s.acquire(permits);
100	>	}
101	>	},
102	>	acquireUninterruptibly() {
103	>	void acquire(Semaphore s) {
104	>	s.acquireUninterruptibly();
105	>	}
106	>	},
107	>	acquireUninterruptiblyN() {
108	>	void acquire(Semaphore s, int permits) {
109	>	s.acquireUninterruptibly(permits);
110	>	}
111	>	},
112	>	tryAcquire() {
113	>	void acquire(Semaphore s) {
114	>	assertTrue(s.tryAcquire());
115		}
116	+	},
117	+	tryAcquireN() {
118	+	void acquire(Semaphore s, int permits) {
119	+	assertTrue(s.tryAcquire(permits));
120	+	}
121	+	},
122	+	tryAcquireTimed() {
123	+	void acquire(Semaphore s) throws InterruptedException {
124	+	assertTrue(s.tryAcquire(2 * LONG_DELAY_MS, MILLISECONDS));
125	+	}
126	+	},
127	+	tryAcquireTimedN {
128	+	void acquire(Semaphore s, int permits) throws InterruptedException {
129	+	assertTrue(s.tryAcquire(permits, 2 * LONG_DELAY_MS, MILLISECONDS));
130	+	}
131	+	};
132	+
133	+	// Intentionally meta-circular
134	+
135	+	/** Acquires 1 permit. */
136	+	void acquire(Semaphore s) throws InterruptedException {
137	+	acquire(s, 1);
138	+	}
139	+	/** Acquires the given number of permits. */
140	+	void acquire(Semaphore s, int permits) throws InterruptedException {
141	+	for (int i = 0; i < permits; i++)
142	+	acquire(s);
143	+	}
144	+	}
145	+
146	+	/**
147	+	* Zero, negative, and positive initial values are allowed in constructor
148	+	*/
149	+	public void testConstructor()      { testConstructor(false); }
150	+	public void testConstructor_fair() { testConstructor(true); }
151	+	public void testConstructor(boolean fair) {
152	+	for (int permits : new int[] { -42, -1, 0, 1, 42 }) {
153	+	Semaphore s = new Semaphore(permits, fair);
154	+	assertEquals(permits, s.availablePermits());
155	+	assertEquals(fair, s.isFair());
156		}
157		}
158
159		/**
160		* Constructor without fairness argument behaves as nonfair
161		*/
162	<	public void testConstructor2() {
163	<	for (int permits : new int[] { -1, 0, 1 }) {
162	>	public void testConstructorDefaultsToNonFair() {
163	>	for (int permits : new int[] { -42, -1, 0, 1, 42 }) {
164		Semaphore s = new Semaphore(permits);
165		assertEquals(permits, s.availablePermits());
166		assertFalse(s.isFair());
#	Line 86 | Line 170 | public class SemaphoreTest extends JSR16
170		/**
171		* tryAcquire succeeds when sufficient permits, else fails
172		*/
173	<	public void testTryAcquireInSameThread() {
174	<	Semaphore s = new Semaphore(2, false);
173	>	public void testTryAcquireInSameThread()      { testTryAcquireInSameThread(false); }
174	>	public void testTryAcquireInSameThread_fair() { testTryAcquireInSameThread(true); }
175	>	public void testTryAcquireInSameThread(boolean fair) {
176	>	Semaphore s = new Semaphore(2, fair);
177		assertEquals(2, s.availablePermits());
178		assertTrue(s.tryAcquire());
179		assertTrue(s.tryAcquire());
180		assertEquals(0, s.availablePermits());
181		assertFalse(s.tryAcquire());
182	+	assertFalse(s.tryAcquire());
183	+	assertEquals(0, s.availablePermits());
184		}
185
186		/**
187	<	* Acquire and release of semaphore succeed if initially available
100	<	*/
101	<	public void testAcquireReleaseInSameThread()
102	<	throws InterruptedException {
103	<	Semaphore s = new Semaphore(1, false);
104	<	s.acquire();
105	<	s.release();
106	<	s.acquire();
107	<	s.release();
108	<	s.acquire();
109	<	s.release();
110	<	s.acquire();
111	<	s.release();
112	<	s.acquire();
113	<	s.release();
114	<	assertEquals(1, s.availablePermits());
115	<	}
116	<
117	<	/**
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());
135	<	}
136	<
137	<	/**
138	<	* Timed Acquire and release of semaphore succeed if
139	<	* initially available
140	<	*/
141	<	public void testTimedAcquireReleaseInSameThread()
142	<	throws InterruptedException {
143	<	Semaphore s = new Semaphore(1, false);
144	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
145	<	s.release();
146	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
147	<	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	<	}
156	<
157	<	/**
158	<	* A release in one thread enables an acquire in another thread
187	>	* timed tryAcquire times out
188		*/
189	<	public void testAcquireReleaseInDifferentThreads()
190	<	throws InterruptedException {
191	<	final Semaphore s = new Semaphore(0, false);
192	<	Thread t = new Thread(new CheckedRunnable() {
193	<	public void realRun() throws InterruptedException {
194	<	s.acquire();
195	<	s.release();
196	<	s.release();
197	<	s.acquire();
189	>	public void testTryAcquire_timeout()      { testTryAcquire_timeout(false); }
190	>	public void testTryAcquire_timeout_fair() { testTryAcquire_timeout(true); }
191	>	public void testTryAcquire_timeout(boolean fair) {
192	>	Semaphore s = new Semaphore(0, fair);
193	>	long startTime = System.nanoTime();
194	>	try { assertFalse(s.tryAcquire(timeoutMillis(), MILLISECONDS)); }
195	>	catch (InterruptedException e) { threadUnexpectedException(e); }
196	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
197	>	}
198	>
199	>	/**
200	>	* timed tryAcquire(N) times out
201	>	*/
202	>	public void testTryAcquireN_timeout()      { testTryAcquireN_timeout(false); }
203	>	public void testTryAcquireN_timeout_fair() { testTryAcquireN_timeout(true); }
204	>	public void testTryAcquireN_timeout(boolean fair) {
205	>	Semaphore s = new Semaphore(2, fair);
206	>	long startTime = System.nanoTime();
207	>	try { assertFalse(s.tryAcquire(3, timeoutMillis(), MILLISECONDS)); }
208	>	catch (InterruptedException e) { threadUnexpectedException(e); }
209	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
210	>	}
211	>
212	>	/**
213	>	* acquire(), acquire(N), timed tryAcquired, timed tryAcquire(N)
214	>	* are interruptible
215	>	*/
216	>	public void testInterruptible_acquire()               { testInterruptible(false, AcquireMethod.acquire); }
217	>	public void testInterruptible_acquire_fair()          { testInterruptible(true,  AcquireMethod.acquire); }
218	>	public void testInterruptible_acquireN()              { testInterruptible(false, AcquireMethod.acquireN); }
219	>	public void testInterruptible_acquireN_fair()         { testInterruptible(true,  AcquireMethod.acquireN); }
220	>	public void testInterruptible_tryAcquireTimed()       { testInterruptible(false, AcquireMethod.tryAcquireTimed); }
221	>	public void testInterruptible_tryAcquireTimed_fair()  { testInterruptible(true,  AcquireMethod.tryAcquireTimed); }
222	>	public void testInterruptible_tryAcquireTimedN()      { testInterruptible(false, AcquireMethod.tryAcquireTimedN); }
223	>	public void testInterruptible_tryAcquireTimedN_fair() { testInterruptible(true,  AcquireMethod.tryAcquireTimedN); }
224	>	public void testInterruptible(boolean fair, final AcquireMethod acquirer) {
225	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
226	>	final Semaphore anotherInterruptPlease = new Semaphore(0, fair);
227	>	Thread t = newStartedThread(new CheckedRunnable() {
228	>	public void realRun() {
229	>	// Interrupt before acquire
230	>	Thread.currentThread().interrupt();
231	>	try {
232	>	acquirer.acquire(s);
233	>	shouldThrow();
234	>	} catch (InterruptedException success) {}
235	>
236	>	// Interrupt during acquire
237	>	try {
238	>	acquirer.acquire(s);
239	>	shouldThrow();
240	>	} catch (InterruptedException success) {}
241	>
242	>	// Interrupt before acquire(N)
243	>	Thread.currentThread().interrupt();
244	>	try {
245	>	acquirer.acquire(s, 3);
246	>	shouldThrow();
247	>	} catch (InterruptedException success) {}
248	>
249	>	anotherInterruptPlease.release();
250	>
251	>	// Interrupt during acquire(N)
252	>	try {
253	>	acquirer.acquire(s, 3);
254	>	shouldThrow();
255	>	} catch (InterruptedException success) {}
256		}});
257
258	<	t.start();
259	<	delay(SHORT_DELAY_MS);
260	<	s.release();
261	<	s.release();
262	<	s.acquire();
263	<	s.acquire();
264	<	s.release();
265	<	t.join();
258	>	waitForQueuedThread(s, t);
259	>	t.interrupt();
260	>	try {
261	>	assertTrue(anotherInterruptPlease.tryAcquire(LONG_DELAY_MS, MILLISECONDS));
262	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
263	>	waitForQueuedThread(s, t);
264	>	t.interrupt();
265	>	awaitTermination(t);
266		}
267
268		/**
269	<	* A release in one thread enables an uninterruptible acquire in another thread
269	>	* acquireUninterruptibly(), acquireUninterruptibly(N) are
270	>	* uninterruptible
271		*/
272	<	public void testUninterruptibleAcquireReleaseInDifferentThreads()
273	<	throws InterruptedException {
274	<	final Semaphore s = new Semaphore(0, false);
275	<	Thread t = new Thread(new CheckedRunnable() {
272	>	public void testUninterruptible_acquireUninterruptibly()       { testUninterruptible(false, AcquireMethod.acquireUninterruptibly); }
273	>	public void testUninterruptible_acquireUninterruptibly_fair()  { testUninterruptible(true,  AcquireMethod.acquireUninterruptibly); }
274	>	public void testUninterruptible_acquireUninterruptiblyN()      { testUninterruptible(false, AcquireMethod.acquireUninterruptiblyN); }
275	>	public void testUninterruptible_acquireUninterruptiblyN_fair() { testUninterruptible(true,  AcquireMethod.acquireUninterruptiblyN); }
276	>	public void testUninterruptible(boolean fair, final AcquireMethod acquirer) {
277	>	final PublicSemaphore s = new PublicSemaphore(0, fair);
278	>	final Semaphore anotherInterruptPlease = new Semaphore(0, fair);
279	>	Thread t = newStartedThread(new CheckedRunnable() {
280		public void realRun() throws InterruptedException {
281	<	s.acquireUninterruptibly();
282	<	s.release();
283	<	s.release();
284	<	s.acquireUninterruptibly();
193	<	}});
194	<
195	<	t.start();
196	<	delay(SHORT_DELAY_MS);
197	<	s.release();
198	<	s.release();
199	<	s.acquireUninterruptibly();
200	<	s.acquireUninterruptibly();
201	<	s.release();
202	<	t.join();
203	<	}
281	>	// Interrupt before acquire
282	>	Thread.currentThread().interrupt();
283	>	acquirer.acquire(s);
284	>	assertTrue(Thread.interrupted());
285
286	+	anotherInterruptPlease.release();
287
288	<	/**
289	<	* A release in one thread enables a timed acquire in another thread
290	<	*/
209	<	public void testTimedAcquireReleaseInDifferentThreads()
210	<	throws InterruptedException {
211	<	final Semaphore s = new Semaphore(1, false);
212	<	Thread t = new Thread(new CheckedRunnable() {
213	<	public void realRun() throws InterruptedException {
214	<	s.release();
215	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
216	<	s.release();
217	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
288	>	// Interrupt during acquire
289	>	acquirer.acquire(s);
290	>	assertTrue(Thread.interrupted());
291		}});
292
293	<	t.start();
294	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
222	<	s.release();
223	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
293	>	waitForQueuedThread(s, t);
294	>	assertThreadStaysAlive(t);
295		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	–	}});
296
297	<	t.start();
298	<	delay(SHORT_DELAY_MS);
297	>	try {
298	>	assertTrue(anotherInterruptPlease.tryAcquire(LONG_DELAY_MS, MILLISECONDS));
299	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
300	>	waitForQueuedThread(s, t);
301		t.interrupt();
302	<	t.join();
303	<	}
245	<
246	<	/**
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	<	}});
302	>	assertThreadStaysAlive(t);
303	>	s.release();
304
305	<	t.start();
258	<	delay(SHORT_DELAY_MS);
259	<	t.interrupt();
260	<	t.join();
305	>	awaitTermination(t);
306		}
307
308		/**
309		* hasQueuedThreads reports whether there are waiting threads
310		*/
311	<	public void testHasQueuedThreads() throws InterruptedException {
312	<	final Semaphore lock = new Semaphore(1, false);
313	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
314	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
311	>	public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
312	>	public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
313	>	public void testHasQueuedThreads(boolean fair) {
314	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
315		assertFalse(lock.hasQueuedThreads());
316		lock.acquireUninterruptibly();
317	<	t1.start();
318	<	delay(SHORT_DELAY_MS);
317	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
318	>	waitForQueuedThread(lock, t1);
319		assertTrue(lock.hasQueuedThreads());
320	<	t2.start();
321	<	delay(SHORT_DELAY_MS);
320	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
321	>	waitForQueuedThread(lock, t2);
322		assertTrue(lock.hasQueuedThreads());
323		t1.interrupt();
324	<	delay(SHORT_DELAY_MS);
324	>	awaitTermination(t1);
325		assertTrue(lock.hasQueuedThreads());
326		lock.release();
327	<	delay(SHORT_DELAY_MS);
327	>	awaitTermination(t2);
328		assertFalse(lock.hasQueuedThreads());
284	–	t1.join();
285	–	t2.join();
329		}
330
331		/**
332		* getQueueLength reports number of waiting threads
333		*/
334	<	public void testGetQueueLength() throws InterruptedException {
335	<	final Semaphore lock = new Semaphore(1, false);
336	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
337	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
334	>	public void testGetQueueLength()      { testGetQueueLength(false); }
335	>	public void testGetQueueLength_fair() { testGetQueueLength(true); }
336	>	public void testGetQueueLength(boolean fair) {
337	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
338		assertEquals(0, lock.getQueueLength());
339		lock.acquireUninterruptibly();
340	<	t1.start();
341	<	delay(SHORT_DELAY_MS);
340	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
341	>	waitForQueuedThread(lock, t1);
342		assertEquals(1, lock.getQueueLength());
343	<	t2.start();
344	<	delay(SHORT_DELAY_MS);
343	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
344	>	waitForQueuedThread(lock, t2);
345		assertEquals(2, lock.getQueueLength());
346		t1.interrupt();
347	<	delay(SHORT_DELAY_MS);
347	>	awaitTermination(t1);
348		assertEquals(1, lock.getQueueLength());
349		lock.release();
350	<	delay(SHORT_DELAY_MS);
350	>	awaitTermination(t2);
351		assertEquals(0, lock.getQueueLength());
309	–	t1.join();
310	–	t2.join();
352		}
353
354		/**
355		* getQueuedThreads includes waiting threads
356		*/
357	<	public void testGetQueuedThreads() throws InterruptedException {
358	<	final PublicSemaphore lock = new PublicSemaphore(1, false);
359	<	Thread t1 = new Thread(new InterruptedLockRunnable(lock));
360	<	Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
357	>	public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
358	>	public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
359	>	public void testGetQueuedThreads(boolean fair) {
360	>	final PublicSemaphore lock = new PublicSemaphore(1, fair);
361		assertTrue(lock.getQueuedThreads().isEmpty());
362		lock.acquireUninterruptibly();
363		assertTrue(lock.getQueuedThreads().isEmpty());
364	<	t1.start();
365	<	delay(SHORT_DELAY_MS);
364	>	Thread t1 = newStartedThread(new InterruptedLockRunnable(lock));
365	>	waitForQueuedThread(lock, t1);
366		assertTrue(lock.getQueuedThreads().contains(t1));
367	<	t2.start();
368	<	delay(SHORT_DELAY_MS);
367	>	Thread t2 = newStartedThread(new InterruptibleLockRunnable(lock));
368	>	waitForQueuedThread(lock, t2);
369		assertTrue(lock.getQueuedThreads().contains(t1));
370		assertTrue(lock.getQueuedThreads().contains(t2));
371		t1.interrupt();
372	<	delay(SHORT_DELAY_MS);
372	>	awaitTermination(t1);
373		assertFalse(lock.getQueuedThreads().contains(t1));
374		assertTrue(lock.getQueuedThreads().contains(t2));
375		lock.release();
376	<	delay(SHORT_DELAY_MS);
376	>	awaitTermination(t2);
377		assertTrue(lock.getQueuedThreads().isEmpty());
337	–	t1.join();
338	–	t2.join();
378		}
379
380		/**
381		* drainPermits reports and removes given number of permits
382		*/
383	<	public void testDrainPermits() {
384	<	Semaphore s = new Semaphore(0, false);
383	>	public void testDrainPermits()      { testDrainPermits(false); }
384	>	public void testDrainPermits_fair() { testDrainPermits(true); }
385	>	public void testDrainPermits(boolean fair) {
386	>	Semaphore s = new Semaphore(0, fair);
387		assertEquals(0, s.availablePermits());
388		assertEquals(0, s.drainPermits());
389		s.release(10);
#	Line 353 | Line 394 | public class SemaphoreTest extends JSR16
394		}
395
396		/**
397	<	* reducePermits reduces number of permits
397	>	* release(-N) throws IllegalArgumentException
398		*/
399	<	public void testReducePermits() {
400	<	PublicSemaphore s = new PublicSemaphore(10, false);
401	<	assertEquals(10, s.availablePermits());
402	<	s.reducePermits(1);
403	<	assertEquals(9, s.availablePermits());
404	<	s.reducePermits(10);
405	<	assertEquals(-1, s.availablePermits());
399	>	public void testReleaseIAE()      { testReleaseIAE(false); }
400	>	public void testReleaseIAE_fair() { testReleaseIAE(true); }
401	>	public void testReleaseIAE(boolean fair) {
402	>	Semaphore s = new Semaphore(10, fair);
403	>	try {
404	>	s.release(-1);
405	>	shouldThrow();
406	>	} catch (IllegalArgumentException success) {}
407		}
408
409		/**
410	<	* a deserialized serialized semaphore has same number of permits
411	<	*/
412	<	public void testSerialization() throws Exception {
413	<	Semaphore l = new Semaphore(3, false);
414	<	l.acquire();
415	<	l.release();
416	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
417	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
418	<	out.writeObject(l);
419	<	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();
410	>	* reducePermits(-N) throws IllegalArgumentException
411	>	*/
412	>	public void testReducePermitsIAE()      { testReducePermitsIAE(false); }
413	>	public void testReducePermitsIAE_fair() { testReducePermitsIAE(true); }
414	>	public void testReducePermitsIAE(boolean fair) {
415	>	PublicSemaphore s = new PublicSemaphore(10, fair);
416	>	try {
417	>	s.reducePermits(-1);
418	>	shouldThrow();
419	>	} catch (IllegalArgumentException success) {}
420		}
421
388	–
422		/**
423	<	* Zero, negative, and positive initial values are allowed in constructor
423	>	* reducePermits reduces number of permits
424		*/
425	<	public void testConstructor_fair() {
426	<	Semaphore s0 = new Semaphore(0, true);
427	<	assertEquals(0, s0.availablePermits());
428	<	assertTrue(s0.isFair());
429	<	Semaphore s1 = new Semaphore(-1, true);
430	<	assertEquals(-1, s1.availablePermits());
431	<	Semaphore s2 = new Semaphore(-1, true);
432	<	assertEquals(-1, s2.availablePermits());
425	>	public void testReducePermits()      { testReducePermits(false); }
426	>	public void testReducePermits_fair() { testReducePermits(true); }
427	>	public void testReducePermits(boolean fair) {
428	>	PublicSemaphore s = new PublicSemaphore(10, fair);
429	>	assertEquals(10, s.availablePermits());
430	>	s.reducePermits(0);
431	>	assertEquals(10, s.availablePermits());
432	>	s.reducePermits(1);
433	>	assertEquals(9, s.availablePermits());
434	>	s.reducePermits(10);
435	>	assertEquals(-1, s.availablePermits());
436	>	s.reducePermits(10);
437	>	assertEquals(-11, s.availablePermits());
438	>	s.reducePermits(0);
439	>	assertEquals(-11, s.availablePermits());
440		}
441
442		/**
443	<	* tryAcquire succeeds when sufficient permits, else fails
444	<	*/
445	<	public void testTryAcquireInSameThread_fair() {
446	<	Semaphore s = new Semaphore(2, true);
447	<	assertEquals(2, s.availablePermits());
448	<	assertTrue(s.tryAcquire());
449	<	assertTrue(s.tryAcquire());
450	<	assertEquals(0, s.availablePermits());
451	<	assertFalse(s.tryAcquire());
443	>	* a reserialized semaphore has same number of permits and
444	>	* fairness, but no queued threads
445	>	*/
446	>	public void testSerialization()      { testSerialization(false); }
447	>	public void testSerialization_fair() { testSerialization(true); }
448	>	public void testSerialization(boolean fair) {
449	>	try {
450	>	Semaphore s = new Semaphore(3, fair);
451	>	s.acquire();
452	>	s.acquire();
453	>	s.release();
454	>
455	>	Semaphore clone = serialClone(s);
456	>	assertEquals(fair, s.isFair());
457	>	assertEquals(fair, clone.isFair());
458	>	assertEquals(2, s.availablePermits());
459	>	assertEquals(2, clone.availablePermits());
460	>	clone.acquire();
461	>	clone.acquire();
462	>	clone.release();
463	>	assertEquals(2, s.availablePermits());
464	>	assertEquals(1, clone.availablePermits());
465	>
466	>	s = new Semaphore(0, fair);
467	>	Thread t = newStartedThread(new InterruptibleLockRunnable(s));
468	>	waitForQueuedThreads(s);
469	>	clone = serialClone(s);
470	>	assertEquals(fair, s.isFair());
471	>	assertEquals(fair, clone.isFair());
472	>	assertEquals(0, s.availablePermits());
473	>	assertEquals(0, clone.availablePermits());
474	>	assertTrue(s.hasQueuedThreads());
475	>	assertFalse(clone.hasQueuedThreads());
476	>	s.release();
477	>	awaitTermination(t);
478	>	assertFalse(s.hasQueuedThreads());
479	>	assertFalse(clone.hasQueuedThreads());
480	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
481		}
482
483		/**
484		* tryAcquire(n) succeeds when sufficient permits, else fails
485		*/
486	<	public void testTryAcquireNInSameThread_fair() {
487	<	Semaphore s = new Semaphore(2, true);
486	>	public void testTryAcquireNInSameThread()      { testTryAcquireNInSameThread(false); }
487	>	public void testTryAcquireNInSameThread_fair() { testTryAcquireNInSameThread(true); }
488	>	public void testTryAcquireNInSameThread(boolean fair) {
489	>	Semaphore s = new Semaphore(2, fair);
490	>	assertEquals(2, s.availablePermits());
491	>	assertFalse(s.tryAcquire(3));
492		assertEquals(2, s.availablePermits());
493		assertTrue(s.tryAcquire(2));
494		assertEquals(0, s.availablePermits());
495	<	assertFalse(s.tryAcquire());
496	<	}
497	<
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());
495	>	assertFalse(s.tryAcquire(1));
496	>	assertFalse(s.tryAcquire(2));
497	>	assertEquals(0, s.availablePermits());
498		}
499
500		/**
501	<	* A release in one thread enables an acquire in another thread
501	>	* acquire succeeds if permits available
502		*/
503	<	public void testAcquireReleaseInDifferentThreads_fair()
504	<	throws InterruptedException {
505	<	final Semaphore s = new Semaphore(0, true);
506	<	Thread t = new Thread(new CheckedRunnable() {
507	<	public void realRun() throws InterruptedException {
508	<	s.acquire();
509	<	s.acquire();
510	<	s.acquire();
511	<	s.acquire();
512	<	}});
513	<
514	<	t.start();
515	<	delay(SHORT_DELAY_MS);
516	<	s.release();
517	<	s.release();
518	<	s.release();
519	<	s.release();
520	<	s.release();
521	<	s.release();
522	<	t.join();
523	<	assertEquals(2, s.availablePermits());
503	>	public void testReleaseAcquireSameThread_acquire()       { testReleaseAcquireSameThread(false, AcquireMethod.acquire); }
504	>	public void testReleaseAcquireSameThread_acquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquire); }
505	>	public void testReleaseAcquireSameThread_acquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireN); }
506	>	public void testReleaseAcquireSameThread_acquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireN); }
507	>	public void testReleaseAcquireSameThread_acquireUninterruptibly()       { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
508	>	public void testReleaseAcquireSameThread_acquireUninterruptibly_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
509	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN()      { testReleaseAcquireSameThread(false, AcquireMethod.acquireUninterruptibly); }
510	>	public void testReleaseAcquireSameThread_acquireUninterruptiblyN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.acquireUninterruptibly); }
511	>	public void testReleaseAcquireSameThread_tryAcquire()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquire); }
512	>	public void testReleaseAcquireSameThread_tryAcquire_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquire); }
513	>	public void testReleaseAcquireSameThread_tryAcquireN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireN); }
514	>	public void testReleaseAcquireSameThread_tryAcquireN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireN); }
515	>	public void testReleaseAcquireSameThread_tryAcquireTimed()       { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimed); }
516	>	public void testReleaseAcquireSameThread_tryAcquireTimed_fair()  { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimed); }
517	>	public void testReleaseAcquireSameThread_tryAcquireTimedN()      { testReleaseAcquireSameThread(false, AcquireMethod.tryAcquireTimedN); }
518	>	public void testReleaseAcquireSameThread_tryAcquireTimedN_fair() { testReleaseAcquireSameThread(true, AcquireMethod.tryAcquireTimedN); }
519	>	public void testReleaseAcquireSameThread(boolean fair,
520	>	final AcquireMethod acquirer) {
521	>	Semaphore s = new Semaphore(1, fair);
522	>	for (int i = 1; i < 6; i++) {
523	>	s.release(i);
524	>	assertEquals(1 + i, s.availablePermits());
525	>	try {
526	>	acquirer.acquire(s, i);
527	>	} catch (InterruptedException e) { threadUnexpectedException(e); }
528	>	assertEquals(1, s.availablePermits());
529	>	}
530		}
531
532		/**
533	<	* release(n) in one thread enables acquire(n) in another thread
533	>	* release in one thread enables acquire in another thread
534		*/
535	<	public void testAcquireReleaseNInDifferentThreads_fair()
536	<	throws InterruptedException {
537	<	final Semaphore s = new Semaphore(0, true);
538	<	Thread t = new Thread(new CheckedRunnable() {
539	<	public void realRun() throws InterruptedException {
540	<	s.acquire();
541	<	s.release(2);
542	<	s.acquire();
543	<	}});
544	<
545	<	t.start();
546	<	delay(SHORT_DELAY_MS);
547	<	s.release(2);
548	<	s.acquire(2);
549	<	s.release(1);
550	<	t.join();
535	>	public void testReleaseAcquireDifferentThreads_acquire()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquire); }
536	>	public void testReleaseAcquireDifferentThreads_acquire_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquire); }
537	>	public void testReleaseAcquireDifferentThreads_acquireN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireN); }
538	>	public void testReleaseAcquireDifferentThreads_acquireN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireN); }
539	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
540	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptibly_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
541	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.acquireUninterruptibly); }
542	>	public void testReleaseAcquireDifferentThreads_acquireUninterruptiblyN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.acquireUninterruptibly); }
543	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed()       { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimed); }
544	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimed_fair()  { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimed); }
545	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN()      { testReleaseAcquireDifferentThreads(false, AcquireMethod.tryAcquireTimedN); }
546	>	public void testReleaseAcquireDifferentThreads_tryAcquireTimedN_fair() { testReleaseAcquireDifferentThreads(true, AcquireMethod.tryAcquireTimedN); }
547	>	public void testReleaseAcquireDifferentThreads(boolean fair,
548	>	final AcquireMethod acquirer) {
549	>	final Semaphore s = new Semaphore(0, fair);
550	>	final int rounds = 4;
551	>	long startTime = System.nanoTime();
552	>	Thread t = newStartedThread(new CheckedRunnable() {
553	>	public void realRun() throws InterruptedException {
554	>	for (int i = 0; i < rounds; i++) {
555	>	assertFalse(s.hasQueuedThreads());
556	>	if (i % 2 == 0)
557	>	acquirer.acquire(s);
558	>	else
559	>	acquirer.acquire(s, 3);
560	>	}}});
561	>
562	>	for (int i = 0; i < rounds; i++) {
563	>	while (! (s.availablePermits() == 0 && s.hasQueuedThreads()))
564	>	Thread.yield();
565	>	assertTrue(t.isAlive());
566	>	if (i % 2 == 0)
567	>	s.release();
568	>	else
569	>	s.release(3);
570	>	}
571	>	awaitTermination(t);
572	>	assertEquals(0, s.availablePermits());
573	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
574		}
575
576		/**
577	<	* release(n) in one thread enables acquire(n) in another thread
577	>	* fair locks are strictly FIFO
578		*/
579	<	public void testAcquireReleaseNInDifferentThreads_fair2()
580	<	throws InterruptedException {
581	<	final Semaphore s = new Semaphore(0, true);
582	<	Thread t = new Thread(new CheckedRunnable() {
579	>	public void testFairLocksFifo() {
580	>	final PublicSemaphore s = new PublicSemaphore(1, true);
581	>	final CountDownLatch pleaseRelease = new CountDownLatch(1);
582	>	Thread t1 = newStartedThread(new CheckedRunnable() {
583		public void realRun() throws InterruptedException {
584	<	s.acquire(2);
585	<	s.acquire(2);
576	<	s.release(4);
584	>	// Will block; permits are available, but not three
585	>	s.acquire(3);
586		}});
587
588	<	t.start();
580	<	delay(SHORT_DELAY_MS);
581	<	s.release(6);
582	<	s.acquire(2);
583	<	s.acquire(2);
584	<	s.release(2);
585	<	t.join();
586	<	}
588	>	waitForQueuedThreads(s);
589
590	<
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() {
590	>	Thread t2 = newStartedThread(new CheckedRunnable() {
591		public void realRun() throws InterruptedException {
592	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
593	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
594	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
600	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
601	<	assertTrue(s.tryAcquire(SHORT_DELAY_MS, MILLISECONDS));
602	<	}});
592	>	// Will fail, even though 1 permit is available
593	>	assertFalse(s.tryAcquire(0L, MILLISECONDS));
594	>	assertFalse(s.tryAcquire(1, 0L, MILLISECONDS));
595
596	<	t.start();
597	<	s.release();
606	<	s.release();
607	<	s.release();
608	<	s.release();
609	<	s.release();
610	<	t.join();
611	<	}
612	<
613	<	/**
614	<	* 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));
622	<	s.release(2);
623	<	assertTrue(s.tryAcquire(2, SHORT_DELAY_MS, MILLISECONDS));
596	>	// untimed tryAcquire will barge and succeed
597	>	assertTrue(s.tryAcquire());
598		s.release(2);
599	<	}});
600	<
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	<	}
599	>	assertTrue(s.tryAcquire(2));
600	>	s.release();
601
602	<	/**
603	<	* 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 {
602	>	pleaseRelease.countDown();
603	>	// Will queue up behind t1, even though 1 permit is available
604		s.acquire();
605		}});
606
607	<	t.start();
608	<	delay(SHORT_DELAY_MS);
609	<	t.interrupt();
610	<	t.join();
611	<	}
612	<
613	<	/**
614	<	* 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	<	delay(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	<	delay(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	<	delay(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	<	delay(SHORT_DELAY_MS);
714	<	assertEquals(1, lock.getQueueLength());
715	<	t2.start();
716	<	delay(SHORT_DELAY_MS);
717	<	assertEquals(2, lock.getQueueLength());
718	<	t1.interrupt();
719	<	delay(SHORT_DELAY_MS);
720	<	assertEquals(1, lock.getQueueLength());
721	<	lock.release();
722	<	delay(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();
749	<	}
607	>	await(pleaseRelease);
608	>	waitForQueuedThread(s, t2);
609	>	s.release(2);
610	>	awaitTermination(t1);
611	>	assertTrue(t2.isAlive());
612	>	s.release();
613	>	awaitTermination(t2);
614	>	}
615
616		/**
617		* toString indicates current number of permits
618		*/
619	<	public void testToString() {
620	<	Semaphore s = new Semaphore(0);
621	<	String us = s.toString();
622	<	assertTrue(us.indexOf("Permits = 0") >= 0);
619	>	public void testToString()      { testToString(false); }
620	>	public void testToString_fair() { testToString(true); }
621	>	public void testToString(boolean fair) {
622	>	PublicSemaphore s = new PublicSemaphore(0, fair);
623	>	assertTrue(s.toString().contains("Permits = 0"));
624		s.release();
625	<	String s1 = s.toString();
626	<	assertTrue(s1.indexOf("Permits = 1") >= 0);
627	<	s.release();
628	<	String s2 = s.toString();
629	<	assertTrue(s2.indexOf("Permits = 2") >= 0);
625	>	assertTrue(s.toString().contains("Permits = 1"));
626	>	s.release(2);
627	>	assertTrue(s.toString().contains("Permits = 3"));
628	>	s.reducePermits(5);
629	>	assertTrue(s.toString().contains("Permits = -2"));
630		}
631
632		}

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