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Comparing jsr166/src/test/tck/CyclicBarrierTest.java (file contents):
Revision 1.1 by dl, Sun Aug 31 19:24:54 2003 UTC vs.
Revision 1.28 by jsr166, Thu Sep 15 01:18:01 2016 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
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/publicdomain/zero/1.0/
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9	<	import junit.framework.*;
9	<	import java.util.*;
10	<	import java.util.concurrent.*;
9	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
10
11	<	public class CyclicBarrierTest extends TestCase{
12	<
11	>	import java.util.concurrent.BrokenBarrierException;
12	>	import java.util.concurrent.CountDownLatch;
13	>	import java.util.concurrent.CyclicBarrier;
14	>	import java.util.concurrent.TimeoutException;
15	>	import java.util.concurrent.atomic.AtomicBoolean;
16	>	import java.util.concurrent.atomic.AtomicInteger;
17	>
18	>	import junit.framework.Test;
19	>	import junit.framework.TestSuite;
20	>
21	>	public class CyclicBarrierTest extends JSR166TestCase {
22		public static void main(String[] args) {
23	<	junit.textui.TestRunner.run (suite());
23	>	main(suite(), args);
24		}
17	–
18	–
25		public static Test suite() {
26	<	return new TestSuite(CyclicBarrierTest.class);
26	>	return new TestSuite(CyclicBarrierTest.class);
27		}
22	–
23	–	private static long SHORT_DELAY_MS = 100;
24	–	private static long MEDIUM_DELAY_MS = 1000;
25	–	private static long LONG_DELAY_MS = 10000;
28
29	<	public void testConstructor1(){
30	<	try{
29	>	/**
30	>	* Spin-waits till the number of waiters == numberOfWaiters.
31	>	*/
32	>	void awaitNumberWaiting(CyclicBarrier barrier, int numberOfWaiters) {
33	>	long startTime = System.nanoTime();
34	>	while (barrier.getNumberWaiting() != numberOfWaiters) {
35	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
36	>	fail("timed out");
37	>	Thread.yield();
38	>	}
39	>	}
40	>
41	>	/**
42	>	* Creating with negative parties throws IAE
43	>	*/
44	>	public void testConstructor1() {
45	>	try {
46		new CyclicBarrier(-1, (Runnable)null);
47	<	fail("should throw");
48	<	} catch(IllegalArgumentException e){}
47	>	shouldThrow();
48	>	} catch (IllegalArgumentException success) {}
49		}
50
51	<	public void testConstructor2(){
52	<	try{
51	>	/**
52	>	* Creating with negative parties and no action throws IAE
53	>	*/
54	>	public void testConstructor2() {
55	>	try {
56		new CyclicBarrier(-1);
57	<	fail("should throw");
58	<	} catch(IllegalArgumentException e){}
57	>	shouldThrow();
58	>	} catch (IllegalArgumentException success) {}
59		}
60
61	<	public void testConstructor3(){
61	>	/**
62	>	* getParties returns the number of parties given in constructor
63	>	*/
64	>	public void testGetParties() {
65		CyclicBarrier b = new CyclicBarrier(2);
66	<	assertEquals(2, b.getParties());
66	>	assertEquals(2, b.getParties());
67		assertEquals(0, b.getNumberWaiting());
68		}
69
70	<	public void testSingleParty() {
71	<	try {
72	<	CyclicBarrier b = new CyclicBarrier(1);
73	<	assertEquals(1, b.getParties());
74	<	assertEquals(0, b.getNumberWaiting());
75	<	b.await();
76	<	b.await();
77	<	assertEquals(0, b.getNumberWaiting());
78	<	}
79	<	catch(Exception e) {
57	<	fail("unexpected exception");
58	<	}
59	<	}
60	<
61	<	private volatile int countAction;
62	<	private class MyAction implements Runnable {
63	<	public void run() { ++countAction; }
70	>	/**
71	>	* A 1-party barrier triggers after single await
72	>	*/
73	>	public void testSingleParty() throws Exception {
74	>	CyclicBarrier b = new CyclicBarrier(1);
75	>	assertEquals(1, b.getParties());
76	>	assertEquals(0, b.getNumberWaiting());
77	>	b.await();
78	>	b.await();
79	>	assertEquals(0, b.getNumberWaiting());
80		}
81
82	<	public void testBarrierAction() {
83	<	try {
84	<	countAction = 0;
85	<	CyclicBarrier b = new CyclicBarrier(1, new MyAction());
86	<	assertEquals(1, b.getParties());
87	<	assertEquals(0, b.getNumberWaiting());
88	<	b.await();
89	<	b.await();
90	<	assertEquals(0, b.getNumberWaiting());
91	<	assertEquals(countAction, 2);
92	<	}
93	<	catch(Exception e) {
94	<	fail("unexpected exception");
95	<	}
82	>	/**
83	>	* The supplied barrier action is run at barrier
84	>	*/
85	>	public void testBarrierAction() throws Exception {
86	>	final AtomicInteger count = new AtomicInteger(0);
87	>	final Runnable incCount = new Runnable() { public void run() {
88	>	count.getAndIncrement(); }};
89	>	CyclicBarrier b = new CyclicBarrier(1, incCount);
90	>	assertEquals(1, b.getParties());
91	>	assertEquals(0, b.getNumberWaiting());
92	>	b.await();
93	>	b.await();
94	>	assertEquals(0, b.getNumberWaiting());
95	>	assertEquals(2, count.get());
96		}
97
98	<
99	<	public void testTwoParties(){
98	>	/**
99	>	* A 2-party/thread barrier triggers after both threads invoke await
100	>	*/
101	>	public void testTwoParties() throws Exception {
102		final CyclicBarrier b = new CyclicBarrier(2);
103	<	Thread t = new Thread(new Runnable() {
104	<	public void run(){
103	>	Thread t = newStartedThread(new CheckedRunnable() {
104	>	public void realRun() throws Exception {
105	>	b.await();
106	>	b.await();
107	>	b.await();
108	>	b.await();
109	>	}});
110	>
111	>	b.await();
112	>	b.await();
113	>	b.await();
114	>	b.await();
115	>	awaitTermination(t);
116	>	}
117	>
118	>	/**
119	>	* An interruption in one party causes others waiting in await to
120	>	* throw BrokenBarrierException
121	>	*/
122	>	public void testAwait1_Interrupted_BrokenBarrier() {
123	>	final CyclicBarrier c = new CyclicBarrier(3);
124	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(2);
125	>	Thread t1 = new ThreadShouldThrow(InterruptedException.class) {
126	>	public void realRun() throws Exception {
127	>	pleaseInterrupt.countDown();
128	>	c.await();
129	>	}};
130	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
131	>	public void realRun() throws Exception {
132	>	pleaseInterrupt.countDown();
133	>	c.await();
134	>	}};
135	>
136	>	t1.start();
137	>	t2.start();
138	>	await(pleaseInterrupt);
139	>	t1.interrupt();
140	>	awaitTermination(t1);
141	>	awaitTermination(t2);
142	>	}
143	>
144	>	/**
145	>	* An interruption in one party causes others waiting in timed await to
146	>	* throw BrokenBarrierException
147	>	*/
148	>	public void testAwait2_Interrupted_BrokenBarrier() throws Exception {
149	>	final CyclicBarrier c = new CyclicBarrier(3);
150	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(2);
151	>	Thread t1 = new ThreadShouldThrow(InterruptedException.class) {
152	>	public void realRun() throws Exception {
153	>	pleaseInterrupt.countDown();
154	>	c.await(LONG_DELAY_MS, MILLISECONDS);
155	>	}};
156	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
157	>	public void realRun() throws Exception {
158	>	pleaseInterrupt.countDown();
159	>	c.await(LONG_DELAY_MS, MILLISECONDS);
160	>	}};
161	>
162	>	t1.start();
163	>	t2.start();
164	>	await(pleaseInterrupt);
165	>	t1.interrupt();
166	>	awaitTermination(t1);
167	>	awaitTermination(t2);
168	>	}
169	>
170	>	/**
171	>	* A timeout in timed await throws TimeoutException
172	>	*/
173	>	public void testAwait3_TimeoutException() throws InterruptedException {
174	>	final CyclicBarrier c = new CyclicBarrier(2);
175	>	Thread t = newStartedThread(new CheckedRunnable() {
176	>	public void realRun() throws Exception {
177	>	long startTime = System.nanoTime();
178	>	try {
179	>	c.await(timeoutMillis(), MILLISECONDS);
180	>	shouldThrow();
181	>	} catch (TimeoutException success) {}
182	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
183	>	}});
184	>
185	>	awaitTermination(t);
186	>	}
187	>
188	>	/**
189	>	* A timeout in one party causes others waiting in timed await to
190	>	* throw BrokenBarrierException
191	>	*/
192	>	public void testAwait4_Timeout_BrokenBarrier() throws InterruptedException {
193	>	final CyclicBarrier c = new CyclicBarrier(3);
194	>	Thread t1 = newStartedThread(new CheckedRunnable() {
195	>	public void realRun() throws Exception {
196	>	try {
197	>	c.await(LONG_DELAY_MS, MILLISECONDS);
198	>	shouldThrow();
199	>	} catch (BrokenBarrierException success) {}
200	>	}});
201	>	Thread t2 = newStartedThread(new CheckedRunnable() {
202	>	public void realRun() throws Exception {
203	>	awaitNumberWaiting(c, 1);
204	>	long startTime = System.nanoTime();
205	>	try {
206	>	c.await(timeoutMillis(), MILLISECONDS);
207	>	shouldThrow();
208	>	} catch (TimeoutException success) {}
209	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
210	>	}});
211	>
212	>	awaitTermination(t1);
213	>	awaitTermination(t2);
214	>	}
215	>
216	>	/**
217	>	* A timeout in one party causes others waiting in await to
218	>	* throw BrokenBarrierException
219	>	*/
220	>	public void testAwait5_Timeout_BrokenBarrier() throws InterruptedException {
221	>	final CyclicBarrier c = new CyclicBarrier(3);
222	>	Thread t1 = newStartedThread(new CheckedRunnable() {
223	>	public void realRun() throws Exception {
224	>	try {
225	>	c.await();
226	>	shouldThrow();
227	>	} catch (BrokenBarrierException success) {}
228	>	}});
229	>	Thread t2 = newStartedThread(new CheckedRunnable() {
230	>	public void realRun() throws Exception {
231	>	awaitNumberWaiting(c, 1);
232	>	long startTime = System.nanoTime();
233	>	try {
234	>	c.await(timeoutMillis(), MILLISECONDS);
235	>	shouldThrow();
236	>	} catch (TimeoutException success) {}
237	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
238	>	}});
239	>
240	>	awaitTermination(t1);
241	>	awaitTermination(t2);
242	>	}
243	>
244	>	/**
245	>	* A reset of an active barrier causes waiting threads to throw
246	>	* BrokenBarrierException
247	>	*/
248	>	public void testReset_BrokenBarrier() throws InterruptedException {
249	>	final CyclicBarrier c = new CyclicBarrier(3);
250	>	final CountDownLatch pleaseReset = new CountDownLatch(2);
251	>	Thread t1 = new ThreadShouldThrow(BrokenBarrierException.class) {
252	>	public void realRun() throws Exception {
253	>	pleaseReset.countDown();
254	>	c.await();
255	>	}};
256	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
257	>	public void realRun() throws Exception {
258	>	pleaseReset.countDown();
259	>	c.await();
260	>	}};
261	>
262	>	t1.start();
263	>	t2.start();
264	>	await(pleaseReset);
265	>
266	>	awaitNumberWaiting(c, 2);
267	>	c.reset();
268	>	awaitTermination(t1);
269	>	awaitTermination(t2);
270	>	}
271	>
272	>	/**
273	>	* A reset before threads enter barrier does not throw
274	>	* BrokenBarrierException
275	>	*/
276	>	public void testReset_NoBrokenBarrier() throws Exception {
277	>	final CyclicBarrier c = new CyclicBarrier(3);
278	>	c.reset();
279	>
280	>	Thread t1 = newStartedThread(new CheckedRunnable() {
281	>	public void realRun() throws Exception {
282	>	c.await();
283	>	}});
284	>	Thread t2 = newStartedThread(new CheckedRunnable() {
285	>	public void realRun() throws Exception {
286	>	c.await();
287	>	}});
288	>
289	>	c.await();
290	>	awaitTermination(t1);
291	>	awaitTermination(t2);
292	>	}
293	>
294	>	/**
295	>	* All threads block while a barrier is broken.
296	>	*/
297	>	public void testReset_Leakage() throws InterruptedException {
298	>	final CyclicBarrier c = new CyclicBarrier(2);
299	>	final AtomicBoolean done = new AtomicBoolean();
300	>	Thread t = newStartedThread(new CheckedRunnable() {
301	>	public void realRun() {
302	>	while (!done.get()) {
303		try {
304	<	b.await();
305	<	b.await();
90	<	b.await();
91	<	b.await();
92	<	} catch(Exception e){
93	<	fail("unexpected exception");
94	<	}}});
304	>	while (c.isBroken())
305	>	c.reset();
306
307	<	try {
308	<	t.start();
309	<	b.await();
310	<	b.await();
311	<	b.await();
312	<	b.await();
313	<	t.join();
314	<	} catch(Exception e){
315	<	fail("unexpected exception");
307	>	c.await();
308	>	shouldThrow();
309	>	}
310	>	catch (BrokenBarrierException ok) {}
311	>	catch (InterruptedException ok) {}
312	>	}}});
313	>
314	>	for (int i = 0; i < 4; i++) {
315	>	delay(timeoutMillis());
316	>	t.interrupt();
317	>	}
318	>	done.set(true);
319	>	t.interrupt();
320	>	awaitTermination(t);
321	>	}
322	>
323	>	/**
324	>	* Reset of a non-broken barrier does not break barrier
325	>	*/
326	>	public void testResetWithoutBreakage() throws Exception {
327	>	final CyclicBarrier barrier = new CyclicBarrier(3);
328	>	for (int i = 0; i < 3; i++) {
329	>	final CyclicBarrier start = new CyclicBarrier(3);
330	>	Thread t1 = newStartedThread(new CheckedRunnable() {
331	>	public void realRun() throws Exception {
332	>	start.await();
333	>	barrier.await();
334	>	}});
335	>
336	>	Thread t2 = newStartedThread(new CheckedRunnable() {
337	>	public void realRun() throws Exception {
338	>	start.await();
339	>	barrier.await();
340	>	}});
341	>
342	>	start.await();
343	>	barrier.await();
344	>	awaitTermination(t1);
345	>	awaitTermination(t2);
346	>	assertFalse(barrier.isBroken());
347	>	assertEquals(0, barrier.getNumberWaiting());
348	>	if (i == 1) barrier.reset();
349	>	assertFalse(barrier.isBroken());
350	>	assertEquals(0, barrier.getNumberWaiting());
351		}
352		}
353
354	+	/**
355	+	* Reset of a barrier after interruption reinitializes it.
356	+	*/
357	+	public void testResetAfterInterrupt() throws Exception {
358	+	final CyclicBarrier barrier = new CyclicBarrier(3);
359	+	for (int i = 0; i < 2; i++) {
360	+	final CyclicBarrier start = new CyclicBarrier(3);
361	+	Thread t1 = new ThreadShouldThrow(InterruptedException.class) {
362	+	public void realRun() throws Exception {
363	+	start.await();
364	+	barrier.await();
365	+	}};
366	+
367	+	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
368	+	public void realRun() throws Exception {
369	+	start.await();
370	+	barrier.await();
371	+	}};
372
109	–	public void testAwait1_Interrupted_BrokenBarrier(){
110	–	final CyclicBarrier c = new CyclicBarrier(3);
111	–	Thread t1 = new Thread(new Runnable() {
112	–	public void run(){
113	–	try{
114	–	c.await();
115	–	fail("should throw");
116	–	} catch(InterruptedException success){}
117	–	catch(Exception b){
118	–	fail("should throw IE");
119	–	}
120	–	}
121	–	});
122	–	Thread t2 = new Thread(new Runnable(){
123	–	public void run(){
124	–	try{
125	–	c.await();
126	–	fail("should throw");
127	–	} catch(BrokenBarrierException success){
128	–	} catch(Exception i){
129	–	fail("should throw BBE");
130	–	}
131	–	}
132	–	});
133	–	try {
373		t1.start();
374		t2.start();
375	<	Thread.sleep(SHORT_DELAY_MS);
375	>	start.await();
376		t1.interrupt();
377	<	t1.join();
378	<	t2.join();
379	<	} catch(InterruptedException e){
380	<	fail("unexpected exception");
377	>	awaitTermination(t1);
378	>	awaitTermination(t2);
379	>	assertTrue(barrier.isBroken());
380	>	assertEquals(0, barrier.getNumberWaiting());
381	>	barrier.reset();
382	>	assertFalse(barrier.isBroken());
383	>	assertEquals(0, barrier.getNumberWaiting());
384		}
385		}
386
387	<	public void testAwait2_Interrupted_BrokenBarrier(){
388	<	final CyclicBarrier c = new CyclicBarrier(3);
389	<	Thread t1 = new Thread(new Runnable() {
390	<	public void run(){
391	<	try{
392	<	c.await(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
393	<	fail("should throw");
394	<	} catch(InterruptedException success){
395	<	} catch(Exception b){
396	<	fail("should throw IE");
397	<	}
398	<	}
399	<	});
400	<	Thread t2 = new Thread(new Runnable(){
401	<	public void run(){
402	<	try{
403	<	c.await(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
404	<	fail("should throw");
405	<	} catch(BrokenBarrierException success){
406	<	} catch(Exception i){
407	<	fail("should throw BBE");
408	<	}
409	<	}
410	<	});
411	<	try {
412	<	t1.start();
413	<	t2.start();
414	<	Thread.sleep(SHORT_DELAY_MS);
415	<	t1.interrupt();
416	<	t1.join();
417	<	t2.join();
418	<	} catch(InterruptedException e){
419	<	fail("unexpected exception");
387	>	/**
388	>	* Reset of a barrier after timeout reinitializes it.
389	>	*/
390	>	public void testResetAfterTimeout() throws Exception {
391	>	final CyclicBarrier barrier = new CyclicBarrier(3);
392	>	for (int i = 0; i < 2; i++) {
393	>	assertEquals(0, barrier.getNumberWaiting());
394	>	Thread t1 = newStartedThread(new CheckedRunnable() {
395	>	public void realRun() throws Exception {
396	>	try {
397	>	barrier.await();
398	>	shouldThrow();
399	>	} catch (BrokenBarrierException success) {}
400	>	}});
401	>	Thread t2 = newStartedThread(new CheckedRunnable() {
402	>	public void realRun() throws Exception {
403	>	awaitNumberWaiting(barrier, 1);
404	>	long startTime = System.nanoTime();
405	>	try {
406	>	barrier.await(timeoutMillis(), MILLISECONDS);
407	>	shouldThrow();
408	>	} catch (TimeoutException success) {}
409	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
410	>	}});
411	>
412	>	awaitTermination(t1);
413	>	awaitTermination(t2);
414	>	assertEquals(0, barrier.getNumberWaiting());
415	>	assertTrue(barrier.isBroken());
416	>	assertEquals(0, barrier.getNumberWaiting());
417	>	barrier.reset();
418	>	assertFalse(barrier.isBroken());
419	>	assertEquals(0, barrier.getNumberWaiting());
420		}
421		}
422	<
423	<	public void testAwait3_TimeOutException(){
424	<	final CyclicBarrier c = new CyclicBarrier(2);
425	<	Thread t = new Thread(new Runnable() {
426	<	public void run(){
427	<	try{
428	<	c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
429	<	fail("should throw");
430	<	} catch(TimeoutException success){
431	<	} catch(Exception b){
432	<	fail("should throw TOE");
433	<
434	<	}
435	<	}
436	<	});
437	<	try {
438	<	t.start();
439	<	t.join();
440	<	} catch(InterruptedException e){
441	<	fail("unexpected exception");
422	>
423	>	/**
424	>	* Reset of a barrier after a failed command reinitializes it.
425	>	*/
426	>	public void testResetAfterCommandException() throws Exception {
427	>	final CyclicBarrier barrier =
428	>	new CyclicBarrier(3, new Runnable() {
429	>	public void run() {
430	>	throw new NullPointerException(); }});
431	>	for (int i = 0; i < 2; i++) {
432	>	final CyclicBarrier start = new CyclicBarrier(3);
433	>	Thread t1 = new ThreadShouldThrow(BrokenBarrierException.class) {
434	>	public void realRun() throws Exception {
435	>	start.await();
436	>	barrier.await();
437	>	}};
438	>
439	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
440	>	public void realRun() throws Exception {
441	>	start.await();
442	>	barrier.await();
443	>	}};
444	>
445	>	t1.start();
446	>	t2.start();
447	>	start.await();
448	>	awaitNumberWaiting(barrier, 2);
449	>	try {
450	>	barrier.await();
451	>	shouldThrow();
452	>	} catch (NullPointerException success) {}
453	>	awaitTermination(t1);
454	>	awaitTermination(t2);
455	>	assertTrue(barrier.isBroken());
456	>	assertEquals(0, barrier.getNumberWaiting());
457	>	barrier.reset();
458	>	assertFalse(barrier.isBroken());
459	>	assertEquals(0, barrier.getNumberWaiting());
460		}
461		}
202	–
462		}

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