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

Comparing jsr166/src/test/tck/LockSupportTest.java (file contents):
Revision 1.12 by jsr166, Sat Nov 21 02:07:27 2009 UTC vs.
Revision 1.29 by jsr166, Fri May 12 18:48:11 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);
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() throws InterruptedException {
39	<	Thread t = new Thread(new CheckedRunnable() {
40	<	public void realRun() {
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 subsequent unpark
93	+	*/
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	<	t.start();
32	<	Thread.sleep(SHORT_DELAY_MS);
120	>	await(pleaseUnpark);
121		LockSupport.unpark(t);
122	<	t.join();
122	>	awaitTermination(t);
123		}
124
125		/**
126	<	* park is released by unpark occurring before park
126	>	* park is released by preceding unpark
127		*/
128	<	public void testPark2() throws InterruptedException {
129	<	Thread t = new Thread(new CheckedRunnable() {
130	<	public void realRun() throws InterruptedException {
131	<	Thread.sleep(SHORT_DELAY_MS);
132	<	LockSupport.park();
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	<	t.start();
157	>	await(pleaseUnpark);
158		LockSupport.unpark(t);
159	<	t.join();
159	>	pleasePark.set(true);
160	>	awaitTermination(t);
161		}
162
163		/**
164	<	* park is released by interrupt
164	>	* park is released by subsequent interrupt
165		*/
166	<	public void testPark3() throws InterruptedException {
167	<	Thread t = new Thread(new CheckedRunnable() {
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	<	LockSupport.park();
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	<	t.start();
198	<	Thread.sleep(SHORT_DELAY_MS);
197	>	await(pleaseInterrupt);
198	>	assertThreadStaysAlive(t);
199		t.interrupt();
200	<	t.join();
200	>	awaitTermination(t);
201		}
202
203		/**
204	<	* park returns if interrupted before park
204	>	* park is released by preceding interrupt
205		*/
206	<	public void testPark4() throws InterruptedException {
207	<	final ReentrantLock lock = new ReentrantLock();
208	<	lock.lock();
209	<	Thread t = new Thread(new CheckedRunnable() {
210	<	public void realRun() {
211	<	lock.lock();
212	<	LockSupport.park();
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	>	final AtomicBoolean pleasePark = new AtomicBoolean(false);
227	>	Thread t = newStartedThread(new CheckedRunnable() {
228	>	public void realRun() throws Exception {
229	>	pleaseInterrupt.countDown();
230	>	while (!pleasePark.get())
231	>	Thread.yield();
232	>	assertTrue(Thread.currentThread().isInterrupted());
233	>	parkMethod.park();
234	>	assertTrue(Thread.currentThread().isInterrupted());
235		}});
236
237	<	t.start();
237	>	await(pleaseInterrupt);
238		t.interrupt();
239	<	lock.unlock();
240	<	t.join();
239	>	pleasePark.set(true);
240	>	awaitTermination(t);
241		}
242
243		/**
244	<	* parkNanos times out if not unparked
244	>	* timed park times out if not unparked
245		*/
246	<	public void testParkNanos() throws InterruptedException {
247	<	Thread t = new Thread(new CheckedRunnable() {
246	>	public void testParkTimesOut_parkNanos() {
247	>	testParkTimesOut(ParkMethod.parkNanos);
248	>	}
249	>	public void testParkTimesOut_parkUntil() {
250	>	testParkTimesOut(ParkMethod.parkUntil);
251	>	}
252	>	public void testParkTimesOut_parkNanosBlocker() {
253	>	testParkTimesOut(ParkMethod.parkNanosBlocker);
254	>	}
255	>	public void testParkTimesOut_parkUntilBlocker() {
256	>	testParkTimesOut(ParkMethod.parkUntilBlocker);
257	>	}
258	>	public void testParkTimesOut(final ParkMethod parkMethod) {
259	>	Thread t = newStartedThread(new CheckedRunnable() {
260		public void realRun() {
261	<	LockSupport.parkNanos(1000);
261	>	for (int tries = MAX_SPURIOUS_WAKEUPS; tries-->0; ) {
262	>	long startTime = System.nanoTime();
263	>	parkMethod.park(timeoutMillis());
264	>	if (millisElapsedSince(startTime) >= timeoutMillis())
265	>	return;
266	>	}
267	>	fail("too many consecutive spurious wakeups?");
268		}});
269
270	<	t.start();
95	<	t.join();
270	>	awaitTermination(t);
271		}
272
273	+	/**
274	+	* getBlocker(null) throws NullPointerException
275	+	*/
276	+	public void testGetBlockerNull() {
277	+	try {
278	+	LockSupport.getBlocker(null);
279	+	shouldThrow();
280	+	} catch (NullPointerException success) {}
281	+	}
282
283		/**
284	<	* parkUntil times out if not unparked
284	>	* getBlocker returns the blocker object passed to park
285		*/
286	<	public void testParkUntil() throws InterruptedException {
287	<	Thread t = new Thread(new CheckedRunnable() {
286	>	public void testGetBlocker_parkBlocker() {
287	>	testGetBlocker(ParkMethod.parkBlocker);
288	>	}
289	>	public void testGetBlocker_parkNanosBlocker() {
290	>	testGetBlocker(ParkMethod.parkNanosBlocker);
291	>	}
292	>	public void testGetBlocker_parkUntilBlocker() {
293	>	testGetBlocker(ParkMethod.parkUntilBlocker);
294	>	}
295	>	public void testGetBlocker(final ParkMethod parkMethod) {
296	>	final CountDownLatch started = new CountDownLatch(1);
297	>	Thread t = newStartedThread(new CheckedRunnable() {
298	>	public void realRun() {
299	>	Thread t = Thread.currentThread();
300	>	started.countDown();
301	>	for (int tries = MAX_SPURIOUS_WAKEUPS; tries-->0; ) {
302	>	assertNull(LockSupport.getBlocker(t));
303	>	parkMethod.park();
304	>	assertNull(LockSupport.getBlocker(t));
305	>	if (Thread.interrupted())
306	>	return;
307	>	}
308	>	fail("too many consecutive spurious wakeups?");
309	>	}});
310	>
311	>	long startTime = System.nanoTime();
312	>	await(started);
313	>	for (;;) {
314	>	Object x = LockSupport.getBlocker(t);
315	>	if (x == theBlocker()) { // success
316	>	t.interrupt();
317	>	awaitTermination(t);
318	>	assertNull(LockSupport.getBlocker(t));
319	>	return;
320	>	} else {
321	>	assertNull(x);  // ok
322	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
323	>	fail("timed out");
324	>	if (t.getState() == Thread.State.TERMINATED)
325	>	break;
326	>	Thread.yield();
327	>	}
328	>	}
329	>	}
330	>
331	>	/**
332	>	* timed park(0) returns immediately.
333	>	*
334	>	* Requires hotspot fix for:
335	>	* 6763959 java.util.concurrent.locks.LockSupport.parkUntil(0) blocks forever
336	>	* which is in jdk7-b118 and 6u25.
337	>	*/
338	>	public void testPark0_parkNanos() {
339	>	testPark0(ParkMethod.parkNanos);
340	>	}
341	>	public void testPark0_parkUntil() {
342	>	testPark0(ParkMethod.parkUntil);
343	>	}
344	>	public void testPark0_parkNanosBlocker() {
345	>	testPark0(ParkMethod.parkNanosBlocker);
346	>	}
347	>	public void testPark0_parkUntilBlocker() {
348	>	testPark0(ParkMethod.parkUntilBlocker);
349	>	}
350	>	public void testPark0(final ParkMethod parkMethod) {
351	>	Thread t = newStartedThread(new CheckedRunnable() {
352	>	public void realRun() {
353	>	parkMethod.park(0L);
354	>	}});
355	>
356	>	awaitTermination(t);
357	>	}
358	>
359	>	/**
360	>	* timed park(Long.MIN_VALUE) returns immediately.
361	>	*/
362	>	public void testParkNeg_parkNanos() {
363	>	testParkNeg(ParkMethod.parkNanos);
364	>	}
365	>	public void testParkNeg_parkUntil() {
366	>	testParkNeg(ParkMethod.parkUntil);
367	>	}
368	>	public void testParkNeg_parkNanosBlocker() {
369	>	testParkNeg(ParkMethod.parkNanosBlocker);
370	>	}
371	>	public void testParkNeg_parkUntilBlocker() {
372	>	testParkNeg(ParkMethod.parkUntilBlocker);
373	>	}
374	>	public void testParkNeg(final ParkMethod parkMethod) {
375	>	Thread t = newStartedThread(new CheckedRunnable() {
376		public void realRun() {
377	<	long d = new Date().getTime() + 100;
106	<	LockSupport.parkUntil(d);
377	>	parkMethod.park(Long.MIN_VALUE);
378		}});
379
380	<	t.start();
110	<	t.join();
380	>	awaitTermination(t);
381		}
382		}

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