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

Comparing jsr166/src/test/tck/LockSupportTest.java (file contents):
Revision 1.10 by jsr166, Mon Nov 16 05:30:08 2009 UTC vs.
Revision 1.30 by jsr166, Fri May 12 18:57:11 2017 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());
21	>	main(suite(), args);
22		}
23	+
24		public static Test suite() {
25	<	return new TestSuite(LockSupportTest.class);
25	>	return new TestSuite(LockSupportTest.class);
26	>	}
27	>
28	>	static {
29	>	// Reduce the risk of rare disastrous classloading in first call to
30	>	// LockSupport.park: https://bugs.openjdk.java.net/browse/JDK-8074773
31	>	Class<?> ensureLoaded = LockSupport.class;
32		}
33
34		/**
35	<	* park is released by unpark occurring after park
35	>	* Returns the blocker object used by tests in this file.
36	>	* Any old object will do; we'll return a convenient one.
37		*/
38	<	public void testPark() {
39	<	Thread t = new Thread(new Runnable() {
40	<	public void run() {
41	<	try {
42	<	LockSupport.park();
43	<	} catch (Exception e) {
44	<	threadUnexpectedException();
45	<	}
46	<	}
47	<	});
48	<	try {
49	<	t.start();
50	<	Thread.sleep(SHORT_DELAY_MS);
51	<	LockSupport.unpark(t);
52	<	t.join();
53	<	}
54	<	catch (Exception e) {
55	<	unexpectedException();
38	>	static Object theBlocker() {
39	>	return LockSupportTest.class;
40	>	}
41	>
42	>	enum ParkMethod {
43	>	park() {
44	>	void park() {
45	>	LockSupport.park();
46	>	}
47	>	void park(long millis) {
48	>	throw new UnsupportedOperationException();
49	>	}
50	>	},
51	>	parkUntil() {
52	>	void park(long millis) {
53	>	LockSupport.parkUntil(deadline(millis));
54	>	}
55	>	},
56	>	parkNanos() {
57	>	void park(long millis) {
58	>	LockSupport.parkNanos(MILLISECONDS.toNanos(millis));
59	>	}
60	>	},
61	>	parkBlocker() {
62	>	void park() {
63	>	LockSupport.park(theBlocker());
64	>	}
65	>	void park(long millis) {
66	>	throw new UnsupportedOperationException();
67	>	}
68	>	},
69	>	parkUntilBlocker() {
70	>	void park(long millis) {
71	>	LockSupport.parkUntil(theBlocker(), deadline(millis));
72	>	}
73	>	},
74	>	parkNanosBlocker() {
75	>	void park(long millis) {
76	>	LockSupport.parkNanos(theBlocker(),
77	>	MILLISECONDS.toNanos(millis));
78	>	}
79	>	};
80	>
81	>	void park() { park(2 * LONG_DELAY_MS); }
82	>	abstract void park(long millis);
83	>
84	>	/** Returns a deadline to use with parkUntil. */
85	>	long deadline(long millis) {
86	>	// beware of rounding
87	>	return System.currentTimeMillis() + millis + 1;
88		}
89		}
90
91		/**
92	<	* park is released by unpark occurring before park
92	>	* park is released by subsequent unpark
93		*/
94	<	public void testPark2() {
95	<	Thread t = new Thread(new Runnable() {
96	<	public void run() {
97	<	try {
98	<	Thread.sleep(SHORT_DELAY_MS);
99	<	LockSupport.park();
100	<	} catch (Exception e) {
101	<	threadUnexpectedException();
102	<	}
103	<	}
104	<	});
105	<	try {
106	<	t.start();
107	<	LockSupport.unpark(t);
108	<	t.join();
109	<	}
110	<	catch (Exception e) {
111	<	unexpectedException();
112	<	}
94	>	public void testParkBeforeUnpark_park() {
95	>	testParkBeforeUnpark(ParkMethod.park);
96	>	}
97	>	public void testParkBeforeUnpark_parkNanos() {
98	>	testParkBeforeUnpark(ParkMethod.parkNanos);
99	>	}
100	>	public void testParkBeforeUnpark_parkUntil() {
101	>	testParkBeforeUnpark(ParkMethod.parkUntil);
102	>	}
103	>	public void testParkBeforeUnpark_parkBlocker() {
104	>	testParkBeforeUnpark(ParkMethod.parkBlocker);
105	>	}
106	>	public void testParkBeforeUnpark_parkNanosBlocker() {
107	>	testParkBeforeUnpark(ParkMethod.parkNanosBlocker);
108	>	}
109	>	public void testParkBeforeUnpark_parkUntilBlocker() {
110	>	testParkBeforeUnpark(ParkMethod.parkUntilBlocker);
111	>	}
112	>	public void testParkBeforeUnpark(final ParkMethod parkMethod) {
113	>	final CountDownLatch pleaseUnpark = new CountDownLatch(1);
114	>	Thread t = newStartedThread(new CheckedRunnable() {
115	>	public void realRun() {
116	>	pleaseUnpark.countDown();
117	>	parkMethod.park();
118	>	}});
119	>
120	>	await(pleaseUnpark);
121	>	LockSupport.unpark(t);
122	>	awaitTermination(t);
123		}
124
125		/**
126	<	* park is released by interrupt
126	>	* park is released by preceding unpark
127		*/
128	<	public void testPark3() {
129	<	Thread t = new Thread(new Runnable() {
130	<	public void run() {
131	<	try {
132	<	LockSupport.park();
133	<	} catch (Exception e) {
134	<	threadUnexpectedException();
135	<	}
136	<	}
137	<	});
138	<	try {
139	<	t.start();
140	<	Thread.sleep(SHORT_DELAY_MS);
141	<	t.interrupt();
142	<	t.join();
143	<	}
144	<	catch (Exception e) {
145	<	unexpectedException();
146	<	}
128	>	public void testParkAfterUnpark_park() {
129	>	testParkAfterUnpark(ParkMethod.park);
130	>	}
131	>	public void testParkAfterUnpark_parkNanos() {
132	>	testParkAfterUnpark(ParkMethod.parkNanos);
133	>	}
134	>	public void testParkAfterUnpark_parkUntil() {
135	>	testParkAfterUnpark(ParkMethod.parkUntil);
136	>	}
137	>	public void testParkAfterUnpark_parkBlocker() {
138	>	testParkAfterUnpark(ParkMethod.parkBlocker);
139	>	}
140	>	public void testParkAfterUnpark_parkNanosBlocker() {
141	>	testParkAfterUnpark(ParkMethod.parkNanosBlocker);
142	>	}
143	>	public void testParkAfterUnpark_parkUntilBlocker() {
144	>	testParkAfterUnpark(ParkMethod.parkUntilBlocker);
145	>	}
146	>	public void testParkAfterUnpark(final ParkMethod parkMethod) {
147	>	final CountDownLatch pleaseUnpark = new CountDownLatch(1);
148	>	final AtomicBoolean pleasePark = new AtomicBoolean(false);
149	>	Thread t = newStartedThread(new CheckedRunnable() {
150	>	public void realRun() {
151	>	pleaseUnpark.countDown();
152	>	while (!pleasePark.get())
153	>	Thread.yield();
154	>	parkMethod.park();
155	>	}});
156	>
157	>	await(pleaseUnpark);
158	>	LockSupport.unpark(t);
159	>	pleasePark.set(true);
160	>	awaitTermination(t);
161		}
162
163		/**
164	<	* park returns if interrupted before park
164	>	* park is released by subsequent interrupt
165		*/
166	<	public void testPark4() {
167	<	final ReentrantLock lock = new ReentrantLock();
168	<	lock.lock();
169	<	Thread t = new Thread(new Runnable() {
170	<	public void run() {
171	<	try {
172	<	lock.lock();
173	<	LockSupport.park();
174	<	} catch (Exception e) {
175	<	threadUnexpectedException();
176	<	}
177	<	}
178	<	});
179	<	try {
180	<	t.start();
181	<	t.interrupt();
182	<	lock.unlock();
183	<	t.join();
184	<	}
185	<	catch (Exception e) {
186	<	unexpectedException();
187	<	}
166	>	public void testParkBeforeInterrupt_park() {
167	>	testParkBeforeInterrupt(ParkMethod.park);
168	>	}
169	>	public void testParkBeforeInterrupt_parkNanos() {
170	>	testParkBeforeInterrupt(ParkMethod.parkNanos);
171	>	}
172	>	public void testParkBeforeInterrupt_parkUntil() {
173	>	testParkBeforeInterrupt(ParkMethod.parkUntil);
174	>	}
175	>	public void testParkBeforeInterrupt_parkBlocker() {
176	>	testParkBeforeInterrupt(ParkMethod.parkBlocker);
177	>	}
178	>	public void testParkBeforeInterrupt_parkNanosBlocker() {
179	>	testParkBeforeInterrupt(ParkMethod.parkNanosBlocker);
180	>	}
181	>	public void testParkBeforeInterrupt_parkUntilBlocker() {
182	>	testParkBeforeInterrupt(ParkMethod.parkUntilBlocker);
183	>	}
184	>	public void testParkBeforeInterrupt(final ParkMethod parkMethod) {
185	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
186	>	Thread t = newStartedThread(new CheckedRunnable() {
187	>	public void realRun() {
188	>	pleaseInterrupt.countDown();
189	>	for (int tries = MAX_SPURIOUS_WAKEUPS; tries-->0; ) {
190	>	parkMethod.park();
191	>	if (Thread.interrupted())
192	>	return;
193	>	}
194	>	fail("too many consecutive spurious wakeups?");
195	>	}});
196	>
197	>	await(pleaseInterrupt);
198	>	assertThreadStaysAlive(t);
199	>	t.interrupt();
200	>	awaitTermination(t);
201		}
202
203		/**
204	<	* parkNanos times out if not unparked
204	>	* park is released by preceding interrupt
205		*/
206	<	public void testParkNanos() {
207	<	Thread t = new Thread(new Runnable() {
208	<	public void run() {
209	<	try {
210	<	LockSupport.parkNanos(1000);
211	<	} catch (Exception e) {
212	<	threadUnexpectedException();
213	<	}
214	<	}
215	<	});
216	<	try {
217	<	t.start();
218	<	t.join();
219	<	}
138	<	catch (Exception e) {
139	<	unexpectedException();
140	<	}
206	>	public void testParkAfterInterrupt_park() {
207	>	testParkAfterInterrupt(ParkMethod.park);
208	>	}
209	>	public void testParkAfterInterrupt_parkNanos() {
210	>	testParkAfterInterrupt(ParkMethod.parkNanos);
211	>	}
212	>	public void testParkAfterInterrupt_parkUntil() {
213	>	testParkAfterInterrupt(ParkMethod.parkUntil);
214	>	}
215	>	public void testParkAfterInterrupt_parkBlocker() {
216	>	testParkAfterInterrupt(ParkMethod.parkBlocker);
217	>	}
218	>	public void testParkAfterInterrupt_parkNanosBlocker() {
219	>	testParkAfterInterrupt(ParkMethod.parkNanosBlocker);
220		}
221	+	public void testParkAfterInterrupt_parkUntilBlocker() {
222	+	testParkAfterInterrupt(ParkMethod.parkUntilBlocker);
223	+	}
224	+	public void testParkAfterInterrupt(final ParkMethod parkMethod) {
225	+	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
226	+	Thread t = newStartedThread(new CheckedRunnable() {
227	+	public void realRun() throws Exception {
228	+	pleaseInterrupt.countDown();
229	+	while (!Thread.currentThread().isInterrupted())
230	+	Thread.yield();
231	+	parkMethod.park();
232	+	assertTrue(Thread.interrupted());
233	+	}});
234
235	+	await(pleaseInterrupt);
236	+	t.interrupt();
237	+	awaitTermination(t);
238	+	}
239
240		/**
241	<	* parkUntil times out if not unparked
241	>	* timed park times out if not unparked
242		*/
243	<	public void testParkUntil() {
244	<	Thread t = new Thread(new Runnable() {
245	<	public void run() {
246	<	try {
247	<	long d = new Date().getTime() + 100;
248	<	LockSupport.parkUntil(d);
249	<	} catch (Exception e) {
250	<	threadUnexpectedException();
251	<	}
252	<	}
253	<	});
254	<	try {
255	<	t.start();
256	<	t.join();
257	<	}
258	<	catch (Exception e) {
259	<	unexpectedException();
243	>	public void testParkTimesOut_parkNanos() {
244	>	testParkTimesOut(ParkMethod.parkNanos);
245	>	}
246	>	public void testParkTimesOut_parkUntil() {
247	>	testParkTimesOut(ParkMethod.parkUntil);
248	>	}
249	>	public void testParkTimesOut_parkNanosBlocker() {
250	>	testParkTimesOut(ParkMethod.parkNanosBlocker);
251	>	}
252	>	public void testParkTimesOut_parkUntilBlocker() {
253	>	testParkTimesOut(ParkMethod.parkUntilBlocker);
254	>	}
255	>	public void testParkTimesOut(final ParkMethod parkMethod) {
256	>	Thread t = newStartedThread(new CheckedRunnable() {
257	>	public void realRun() {
258	>	for (int tries = MAX_SPURIOUS_WAKEUPS; tries-->0; ) {
259	>	long startTime = System.nanoTime();
260	>	parkMethod.park(timeoutMillis());
261	>	if (millisElapsedSince(startTime) >= timeoutMillis())
262	>	return;
263	>	}
264	>	fail("too many consecutive spurious wakeups?");
265	>	}});
266	>
267	>	awaitTermination(t);
268	>	}
269	>
270	>	/**
271	>	* getBlocker(null) throws NullPointerException
272	>	*/
273	>	public void testGetBlockerNull() {
274	>	try {
275	>	LockSupport.getBlocker(null);
276	>	shouldThrow();
277	>	} catch (NullPointerException success) {}
278	>	}
279	>
280	>	/**
281	>	* getBlocker returns the blocker object passed to park
282	>	*/
283	>	public void testGetBlocker_parkBlocker() {
284	>	testGetBlocker(ParkMethod.parkBlocker);
285	>	}
286	>	public void testGetBlocker_parkNanosBlocker() {
287	>	testGetBlocker(ParkMethod.parkNanosBlocker);
288	>	}
289	>	public void testGetBlocker_parkUntilBlocker() {
290	>	testGetBlocker(ParkMethod.parkUntilBlocker);
291	>	}
292	>	public void testGetBlocker(final ParkMethod parkMethod) {
293	>	final CountDownLatch started = new CountDownLatch(1);
294	>	Thread t = newStartedThread(new CheckedRunnable() {
295	>	public void realRun() {
296	>	Thread t = Thread.currentThread();
297	>	started.countDown();
298	>	for (int tries = MAX_SPURIOUS_WAKEUPS; tries-->0; ) {
299	>	assertNull(LockSupport.getBlocker(t));
300	>	parkMethod.park();
301	>	assertNull(LockSupport.getBlocker(t));
302	>	if (Thread.interrupted())
303	>	return;
304	>	}
305	>	fail("too many consecutive spurious wakeups?");
306	>	}});
307	>
308	>	long startTime = System.nanoTime();
309	>	await(started);
310	>	for (;;) {
311	>	Object x = LockSupport.getBlocker(t);
312	>	if (x == theBlocker()) { // success
313	>	t.interrupt();
314	>	awaitTermination(t);
315	>	assertNull(LockSupport.getBlocker(t));
316	>	return;
317	>	} else {
318	>	assertNull(x);  // ok
319	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
320	>	fail("timed out");
321	>	if (t.getState() == Thread.State.TERMINATED)
322	>	break;
323	>	Thread.yield();
324	>	}
325		}
326		}
327	+
328	+	/**
329	+	* timed park(0) returns immediately.
330	+	*
331	+	* Requires hotspot fix for:
332	+	* 6763959 java.util.concurrent.locks.LockSupport.parkUntil(0) blocks forever
333	+	* which is in jdk7-b118 and 6u25.
334	+	*/
335	+	public void testPark0_parkNanos() {
336	+	testPark0(ParkMethod.parkNanos);
337	+	}
338	+	public void testPark0_parkUntil() {
339	+	testPark0(ParkMethod.parkUntil);
340	+	}
341	+	public void testPark0_parkNanosBlocker() {
342	+	testPark0(ParkMethod.parkNanosBlocker);
343	+	}
344	+	public void testPark0_parkUntilBlocker() {
345	+	testPark0(ParkMethod.parkUntilBlocker);
346	+	}
347	+	public void testPark0(final ParkMethod parkMethod) {
348	+	Thread t = newStartedThread(new CheckedRunnable() {
349	+	public void realRun() {
350	+	parkMethod.park(0L);
351	+	}});
352	+
353	+	awaitTermination(t);
354	+	}
355	+
356	+	/**
357	+	* timed park(Long.MIN_VALUE) returns immediately.
358	+	*/
359	+	public void testParkNeg_parkNanos() {
360	+	testParkNeg(ParkMethod.parkNanos);
361	+	}
362	+	public void testParkNeg_parkUntil() {
363	+	testParkNeg(ParkMethod.parkUntil);
364	+	}
365	+	public void testParkNeg_parkNanosBlocker() {
366	+	testParkNeg(ParkMethod.parkNanosBlocker);
367	+	}
368	+	public void testParkNeg_parkUntilBlocker() {
369	+	testParkNeg(ParkMethod.parkUntilBlocker);
370	+	}
371	+	public void testParkNeg(final ParkMethod parkMethod) {
372	+	Thread t = newStartedThread(new CheckedRunnable() {
373	+	public void realRun() {
374	+	parkMethod.park(Long.MIN_VALUE);
375	+	}});
376	+
377	+	awaitTermination(t);
378	+	}
379		}

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