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

Comparing jsr166/src/test/tck/LockSupportTest.java (file contents):
Revision 1.14 by jsr166, Wed Aug 25 00:07:03 2010 UTC vs.
Revision 1.24 by jsr166, Wed Dec 31 19:05:43 2014 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
2	>	* Written by Doug Lea and Martin Buchholz with assistance from
3	>	* members of JCP JSR-166 Expert Group and released to the public
4	>	* domain, as explained at
5	>	* http://creativecommons.org/publicdomain/zero/1.0/
6		* Other contributors include Andrew Wright, Jeffrey Hayes,
7		* Pat Fisher, Mike Judd.
8		*/
9
10	<	import junit.framework.*;
11	<	import java.util.*;
12	<	import java.util.concurrent.*;
13	<	import java.util.concurrent.locks.*;
10	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
11	>
12	>	import java.util.concurrent.CountDownLatch;
13	>	import java.util.concurrent.atomic.AtomicBoolean;
14	>	import java.util.concurrent.locks.LockSupport;
15	>
16	>	import junit.framework.Test;
17	>	import junit.framework.TestSuite;
18
19		public class LockSupportTest extends JSR166TestCase {
20		public static void main(String[] args) {
21		junit.textui.TestRunner.run(suite());
22		}
23	+
24		public static Test suite() {
25		return new TestSuite(LockSupportTest.class);
26		}
27
28		/**
29	<	* park is released by unpark occurring after park
29	>	* Returns the blocker object used by tests in this file.
30	>	* Any old object will do; we'll return a convenient one.
31		*/
32	<	public void testPark() throws InterruptedException {
33	<	Thread t = new Thread(new CheckedRunnable() {
34	<	public void realRun() {
32	>	static Object theBlocker() {
33	>	return LockSupportTest.class;
34	>	}
35	>
36	>	enum ParkMethod {
37	>	park() {
38	>	void park() {
39		LockSupport.park();
40	+	}
41	+	void park(long millis) {
42	+	throw new UnsupportedOperationException();
43	+	}
44	+	},
45	+	parkUntil() {
46	+	void park(long millis) {
47	+	LockSupport.parkUntil(deadline(millis));
48	+	}
49	+	},
50	+	parkNanos() {
51	+	void park(long millis) {
52	+	LockSupport.parkNanos(MILLISECONDS.toNanos(millis));
53	+	}
54	+	},
55	+	parkBlocker() {
56	+	void park() {
57	+	LockSupport.park(theBlocker());
58	+	}
59	+	void park(long millis) {
60	+	throw new UnsupportedOperationException();
61	+	}
62	+	},
63	+	parkUntilBlocker() {
64	+	void park(long millis) {
65	+	LockSupport.parkUntil(theBlocker(), deadline(millis));
66	+	}
67	+	},
68	+	parkNanosBlocker() {
69	+	void park(long millis) {
70	+	LockSupport.parkNanos(theBlocker(),
71	+	MILLISECONDS.toNanos(millis));
72	+	}
73	+	};
74	+
75	+	void park() { park(2 * LONG_DELAY_MS); }
76	+	abstract void park(long millis);
77	+
78	+	/** Returns a deadline to use with parkUntil. */
79	+	long deadline(long millis) {
80	+	// beware of rounding
81	+	return System.currentTimeMillis() + millis + 1;
82	+	}
83	+	}
84	+
85	+	/**
86	+	* park is released by subsequent unpark
87	+	*/
88	+	public void testParkBeforeUnpark_park() {
89	+	testParkBeforeUnpark(ParkMethod.park);
90	+	}
91	+	public void testParkBeforeUnpark_parkNanos() {
92	+	testParkBeforeUnpark(ParkMethod.parkNanos);
93	+	}
94	+	public void testParkBeforeUnpark_parkUntil() {
95	+	testParkBeforeUnpark(ParkMethod.parkUntil);
96	+	}
97	+	public void testParkBeforeUnpark_parkBlocker() {
98	+	testParkBeforeUnpark(ParkMethod.parkBlocker);
99	+	}
100	+	public void testParkBeforeUnpark_parkNanosBlocker() {
101	+	testParkBeforeUnpark(ParkMethod.parkNanosBlocker);
102	+	}
103	+	public void testParkBeforeUnpark_parkUntilBlocker() {
104	+	testParkBeforeUnpark(ParkMethod.parkUntilBlocker);
105	+	}
106	+	public void testParkBeforeUnpark(final ParkMethod parkMethod) {
107	+	final CountDownLatch pleaseUnpark = new CountDownLatch(1);
108	+	Thread t = newStartedThread(new CheckedRunnable() {
109	+	public void realRun() {
110	+	pleaseUnpark.countDown();
111	+	parkMethod.park();
112		}});
113
114	<	t.start();
32	<	Thread.sleep(SHORT_DELAY_MS);
114	>	await(pleaseUnpark);
115		LockSupport.unpark(t);
116	<	t.join();
116	>	awaitTermination(t);
117		}
118
119		/**
120	<	* park is released by unpark occurring before park
120	>	* park is released by preceding unpark
121		*/
122	<	public void testPark2() throws InterruptedException {
123	<	Thread t = new Thread(new CheckedRunnable() {
124	<	public void realRun() throws InterruptedException {
125	<	Thread.sleep(SHORT_DELAY_MS);
126	<	LockSupport.park();
122	>	public void testParkAfterUnpark_park() {
123	>	testParkAfterUnpark(ParkMethod.park);
124	>	}
125	>	public void testParkAfterUnpark_parkNanos() {
126	>	testParkAfterUnpark(ParkMethod.parkNanos);
127	>	}
128	>	public void testParkAfterUnpark_parkUntil() {
129	>	testParkAfterUnpark(ParkMethod.parkUntil);
130	>	}
131	>	public void testParkAfterUnpark_parkBlocker() {
132	>	testParkAfterUnpark(ParkMethod.parkBlocker);
133	>	}
134	>	public void testParkAfterUnpark_parkNanosBlocker() {
135	>	testParkAfterUnpark(ParkMethod.parkNanosBlocker);
136	>	}
137	>	public void testParkAfterUnpark_parkUntilBlocker() {
138	>	testParkAfterUnpark(ParkMethod.parkUntilBlocker);
139	>	}
140	>	public void testParkAfterUnpark(final ParkMethod parkMethod) {
141	>	final CountDownLatch pleaseUnpark = new CountDownLatch(1);
142	>	final AtomicBoolean pleasePark = new AtomicBoolean(false);
143	>	Thread t = newStartedThread(new CheckedRunnable() {
144	>	public void realRun() {
145	>	pleaseUnpark.countDown();
146	>	while (!pleasePark.get())
147	>	Thread.yield();
148	>	parkMethod.park();
149		}});
150
151	<	t.start();
151	>	await(pleaseUnpark);
152		LockSupport.unpark(t);
153	<	t.join();
153	>	pleasePark.set(true);
154	>	awaitTermination(t);
155		}
156
157		/**
158	<	* park is released by interrupt
158	>	* park is released by subsequent interrupt
159		*/
160	<	public void testPark3() throws InterruptedException {
161	<	Thread t = new Thread(new CheckedRunnable() {
160	>	public void testParkBeforeInterrupt_park() {
161	>	testParkBeforeInterrupt(ParkMethod.park);
162	>	}
163	>	public void testParkBeforeInterrupt_parkNanos() {
164	>	testParkBeforeInterrupt(ParkMethod.parkNanos);
165	>	}
166	>	public void testParkBeforeInterrupt_parkUntil() {
167	>	testParkBeforeInterrupt(ParkMethod.parkUntil);
168	>	}
169	>	public void testParkBeforeInterrupt_parkBlocker() {
170	>	testParkBeforeInterrupt(ParkMethod.parkBlocker);
171	>	}
172	>	public void testParkBeforeInterrupt_parkNanosBlocker() {
173	>	testParkBeforeInterrupt(ParkMethod.parkNanosBlocker);
174	>	}
175	>	public void testParkBeforeInterrupt_parkUntilBlocker() {
176	>	testParkBeforeInterrupt(ParkMethod.parkUntilBlocker);
177	>	}
178	>	public void testParkBeforeInterrupt(final ParkMethod parkMethod) {
179	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
180	>	Thread t = newStartedThread(new CheckedRunnable() {
181		public void realRun() {
182	<	LockSupport.park();
182	>	pleaseInterrupt.countDown();
183	>	do {
184	>	parkMethod.park();
185	>	// park may return spuriously
186	>	} while (! Thread.currentThread().isInterrupted());
187		}});
188
189	<	t.start();
190	<	Thread.sleep(SHORT_DELAY_MS);
189	>	await(pleaseInterrupt);
190	>	assertThreadStaysAlive(t);
191		t.interrupt();
192	<	t.join();
192	>	awaitTermination(t);
193		}
194
195		/**
196	<	* park returns if interrupted before park
196	>	* park is released by preceding interrupt
197		*/
198	<	public void testPark4() throws InterruptedException {
199	<	final ReentrantLock lock = new ReentrantLock();
200	<	lock.lock();
201	<	Thread t = new Thread(new CheckedRunnable() {
202	<	public void realRun() {
203	<	lock.lock();
204	<	LockSupport.park();
198	>	public void testParkAfterInterrupt_park() {
199	>	testParkAfterInterrupt(ParkMethod.park);
200	>	}
201	>	public void testParkAfterInterrupt_parkNanos() {
202	>	testParkAfterInterrupt(ParkMethod.parkNanos);
203	>	}
204	>	public void testParkAfterInterrupt_parkUntil() {
205	>	testParkAfterInterrupt(ParkMethod.parkUntil);
206	>	}
207	>	public void testParkAfterInterrupt_parkBlocker() {
208	>	testParkAfterInterrupt(ParkMethod.parkBlocker);
209	>	}
210	>	public void testParkAfterInterrupt_parkNanosBlocker() {
211	>	testParkAfterInterrupt(ParkMethod.parkNanosBlocker);
212	>	}
213	>	public void testParkAfterInterrupt_parkUntilBlocker() {
214	>	testParkAfterInterrupt(ParkMethod.parkUntilBlocker);
215	>	}
216	>	public void testParkAfterInterrupt(final ParkMethod parkMethod) {
217	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
218	>	final AtomicBoolean pleasePark = new AtomicBoolean(false);
219	>	Thread t = newStartedThread(new CheckedRunnable() {
220	>	public void realRun() throws Exception {
221	>	pleaseInterrupt.countDown();
222	>	while (!pleasePark.get())
223	>	Thread.yield();
224	>	assertTrue(Thread.currentThread().isInterrupted());
225	>	parkMethod.park();
226	>	assertTrue(Thread.currentThread().isInterrupted());
227		}});
228
229	<	t.start();
80	<	Thread.sleep(SHORT_DELAY_MS);
229	>	await(pleaseInterrupt);
230		t.interrupt();
231	<	lock.unlock();
232	<	t.join();
231	>	pleasePark.set(true);
232	>	awaitTermination(t);
233	>	}
234	>
235	>	/**
236	>	* timed park times out if not unparked
237	>	*/
238	>	public void testParkTimesOut_parkNanos() {
239	>	testParkTimesOut(ParkMethod.parkNanos);
240	>	}
241	>	public void testParkTimesOut_parkUntil() {
242	>	testParkTimesOut(ParkMethod.parkUntil);
243	>	}
244	>	public void testParkTimesOut_parkNanosBlocker() {
245	>	testParkTimesOut(ParkMethod.parkNanosBlocker);
246	>	}
247	>	public void testParkTimesOut_parkUntilBlocker() {
248	>	testParkTimesOut(ParkMethod.parkUntilBlocker);
249	>	}
250	>	public void testParkTimesOut(final ParkMethod parkMethod) {
251	>	Thread t = newStartedThread(new CheckedRunnable() {
252	>	public void realRun() {
253	>	for (;;) {
254	>	long startTime = System.nanoTime();
255	>	parkMethod.park(timeoutMillis());
256	>	// park may return spuriously
257	>	if (millisElapsedSince(startTime) >= timeoutMillis())
258	>	return;
259	>	}
260	>	}});
261	>
262	>	awaitTermination(t);
263	>	}
264	>
265	>	/**
266	>	* getBlocker(null) throws NullPointerException
267	>	*/
268	>	public void testGetBlockerNull() {
269	>	try {
270	>	LockSupport.getBlocker(null);
271	>	shouldThrow();
272	>	} catch (NullPointerException success) {}
273		}
274
275		/**
276	<	* parkNanos times out if not unparked
276	>	* getBlocker returns the blocker object passed to park
277		*/
278	<	public void testParkNanos() throws InterruptedException {
279	<	Thread t = new Thread(new CheckedRunnable() {
278	>	public void testGetBlocker_parkBlocker() {
279	>	testGetBlocker(ParkMethod.parkBlocker);
280	>	}
281	>	public void testGetBlocker_parkNanosBlocker() {
282	>	testGetBlocker(ParkMethod.parkNanosBlocker);
283	>	}
284	>	public void testGetBlocker_parkUntilBlocker() {
285	>	testGetBlocker(ParkMethod.parkUntilBlocker);
286	>	}
287	>	public void testGetBlocker(final ParkMethod parkMethod) {
288	>	final CountDownLatch started = new CountDownLatch(1);
289	>	Thread t = newStartedThread(new CheckedRunnable() {
290		public void realRun() {
291	<	LockSupport.parkNanos(1000);
291	>	Thread t = Thread.currentThread();
292	>	started.countDown();
293	>	do {
294	>	assertNull(LockSupport.getBlocker(t));
295	>	parkMethod.park();
296	>	assertNull(LockSupport.getBlocker(t));
297	>	// park may return spuriously
298	>	} while (! Thread.currentThread().isInterrupted());
299		}});
300
301	<	t.start();
302	<	t.join();
301	>	long startTime = System.nanoTime();
302	>	await(started);
303	>	for (;;) {
304	>	Object x = LockSupport.getBlocker(t);
305	>	if (x == theBlocker()) { // success
306	>	t.interrupt();
307	>	awaitTermination(t);
308	>	assertNull(LockSupport.getBlocker(t));
309	>	return;
310	>	} else {
311	>	assertNull(x);  // ok
312	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
313	>	fail("timed out");
314	>	Thread.yield();
315	>	}
316	>	}
317	>	}
318	>
319	>	/**
320	>	* timed park(0) returns immediately.
321	>	*
322	>	* Requires hotspot fix for:
323	>	* 6763959 java.util.concurrent.locks.LockSupport.parkUntil(0) blocks forever
324	>	* which is in jdk7-b118 and 6u25.
325	>	*/
326	>	public void testPark0_parkNanos() {
327	>	testPark0(ParkMethod.parkNanos);
328	>	}
329	>	public void testPark0_parkUntil() {
330	>	testPark0(ParkMethod.parkUntil);
331		}
332	+	public void testPark0_parkNanosBlocker() {
333	+	testPark0(ParkMethod.parkNanosBlocker);
334	+	}
335	+	public void testPark0_parkUntilBlocker() {
336	+	testPark0(ParkMethod.parkUntilBlocker);
337	+	}
338	+	public void testPark0(final ParkMethod parkMethod) {
339	+	Thread t = newStartedThread(new CheckedRunnable() {
340	+	public void realRun() {
341	+	parkMethod.park(0L);
342	+	}});
343
344	+	awaitTermination(t);
345	+	}
346
347		/**
348	<	* parkUntil times out if not unparked
348	>	* timed park(Long.MIN_VALUE) returns immediately.
349		*/
350	<	public void testParkUntil() throws InterruptedException {
351	<	Thread t = new Thread(new CheckedRunnable() {
350	>	public void testParkNeg_parkNanos() {
351	>	testParkNeg(ParkMethod.parkNanos);
352	>	}
353	>	public void testParkNeg_parkUntil() {
354	>	testParkNeg(ParkMethod.parkUntil);
355	>	}
356	>	public void testParkNeg_parkNanosBlocker() {
357	>	testParkNeg(ParkMethod.parkNanosBlocker);
358	>	}
359	>	public void testParkNeg_parkUntilBlocker() {
360	>	testParkNeg(ParkMethod.parkUntilBlocker);
361	>	}
362	>	public void testParkNeg(final ParkMethod parkMethod) {
363	>	Thread t = newStartedThread(new CheckedRunnable() {
364		public void realRun() {
365	<	long d = new Date().getTime() + 100;
107	<	LockSupport.parkUntil(d);
365	>	parkMethod.park(Long.MIN_VALUE);
366		}});
367
368	<	t.start();
111	<	t.join();
368	>	awaitTermination(t);
369		}
370		}

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