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

Comparing jsr166/src/test/tck/CyclicBarrierTest.java (file contents):
Revision 1.1 by dl, Sun Aug 31 19:24:54 2003 UTC vs.
Revision 1.29 by jsr166, Mon May 29 22:44:26 2017 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 IllegalArgumentException
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
53	>	* IllegalArgumentException
54	>	*/
55	>	public void testConstructor2() {
56	>	try {
57		new CyclicBarrier(-1);
58	<	fail("should throw");
59	<	} catch(IllegalArgumentException e){}
58	>	shouldThrow();
59	>	} catch (IllegalArgumentException success) {}
60		}
61
62	<	public void testConstructor3(){
62	>	/**
63	>	* getParties returns the number of parties given in constructor
64	>	*/
65	>	public void testGetParties() {
66		CyclicBarrier b = new CyclicBarrier(2);
67	<	assertEquals(2, b.getParties());
67	>	assertEquals(2, b.getParties());
68		assertEquals(0, b.getNumberWaiting());
69		}
70
71	<	public void testSingleParty() {
72	<	try {
73	<	CyclicBarrier b = new CyclicBarrier(1);
74	<	assertEquals(1, b.getParties());
75	<	assertEquals(0, b.getNumberWaiting());
76	<	b.await();
77	<	b.await();
78	<	assertEquals(0, b.getNumberWaiting());
79	<	}
80	<	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; }
71	>	/**
72	>	* A 1-party barrier triggers after single await
73	>	*/
74	>	public void testSingleParty() throws Exception {
75	>	CyclicBarrier b = new CyclicBarrier(1);
76	>	assertEquals(1, b.getParties());
77	>	assertEquals(0, b.getNumberWaiting());
78	>	b.await();
79	>	b.await();
80	>	assertEquals(0, b.getNumberWaiting());
81		}
82
83	<	public void testBarrierAction() {
84	<	try {
85	<	countAction = 0;
86	<	CyclicBarrier b = new CyclicBarrier(1, new MyAction());
87	<	assertEquals(1, b.getParties());
88	<	assertEquals(0, b.getNumberWaiting());
89	<	b.await();
90	<	b.await();
91	<	assertEquals(0, b.getNumberWaiting());
92	<	assertEquals(countAction, 2);
93	<	}
94	<	catch(Exception e) {
95	<	fail("unexpected exception");
96	<	}
83	>	/**
84	>	* The supplied barrier action is run at barrier
85	>	*/
86	>	public void testBarrierAction() throws Exception {
87	>	final AtomicInteger count = new AtomicInteger(0);
88	>	final Runnable incCount = new Runnable() { public void run() {
89	>	count.getAndIncrement(); }};
90	>	CyclicBarrier b = new CyclicBarrier(1, incCount);
91	>	assertEquals(1, b.getParties());
92	>	assertEquals(0, b.getNumberWaiting());
93	>	b.await();
94	>	b.await();
95	>	assertEquals(0, b.getNumberWaiting());
96	>	assertEquals(2, count.get());
97		}
98
99	<
100	<	public void testTwoParties(){
99	>	/**
100	>	* A 2-party/thread barrier triggers after both threads invoke await
101	>	*/
102	>	public void testTwoParties() throws Exception {
103		final CyclicBarrier b = new CyclicBarrier(2);
104	<	Thread t = new Thread(new Runnable() {
105	<	public void run(){
104	>	Thread t = newStartedThread(new CheckedRunnable() {
105	>	public void realRun() throws Exception {
106	>	b.await();
107	>	b.await();
108	>	b.await();
109	>	b.await();
110	>	}});
111	>
112	>	b.await();
113	>	b.await();
114	>	b.await();
115	>	b.await();
116	>	awaitTermination(t);
117	>	}
118	>
119	>	/**
120	>	* An interruption in one party causes others waiting in await to
121	>	* throw BrokenBarrierException
122	>	*/
123	>	public void testAwait1_Interrupted_BrokenBarrier() {
124	>	final CyclicBarrier c = new CyclicBarrier(3);
125	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(2);
126	>	Thread t1 = new ThreadShouldThrow(InterruptedException.class) {
127	>	public void realRun() throws Exception {
128	>	pleaseInterrupt.countDown();
129	>	c.await();
130	>	}};
131	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
132	>	public void realRun() throws Exception {
133	>	pleaseInterrupt.countDown();
134	>	c.await();
135	>	}};
136	>
137	>	t1.start();
138	>	t2.start();
139	>	await(pleaseInterrupt);
140	>	t1.interrupt();
141	>	awaitTermination(t1);
142	>	awaitTermination(t2);
143	>	}
144	>
145	>	/**
146	>	* An interruption in one party causes others waiting in timed await to
147	>	* throw BrokenBarrierException
148	>	*/
149	>	public void testAwait2_Interrupted_BrokenBarrier() throws Exception {
150	>	final CyclicBarrier c = new CyclicBarrier(3);
151	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(2);
152	>	Thread t1 = new ThreadShouldThrow(InterruptedException.class) {
153	>	public void realRun() throws Exception {
154	>	pleaseInterrupt.countDown();
155	>	c.await(LONG_DELAY_MS, MILLISECONDS);
156	>	}};
157	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
158	>	public void realRun() throws Exception {
159	>	pleaseInterrupt.countDown();
160	>	c.await(LONG_DELAY_MS, MILLISECONDS);
161	>	}};
162	>
163	>	t1.start();
164	>	t2.start();
165	>	await(pleaseInterrupt);
166	>	t1.interrupt();
167	>	awaitTermination(t1);
168	>	awaitTermination(t2);
169	>	}
170	>
171	>	/**
172	>	* A timeout in timed await throws TimeoutException
173	>	*/
174	>	public void testAwait3_TimeoutException() throws InterruptedException {
175	>	final CyclicBarrier c = new CyclicBarrier(2);
176	>	Thread t = newStartedThread(new CheckedRunnable() {
177	>	public void realRun() throws Exception {
178	>	long startTime = System.nanoTime();
179	>	try {
180	>	c.await(timeoutMillis(), MILLISECONDS);
181	>	shouldThrow();
182	>	} catch (TimeoutException success) {}
183	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
184	>	}});
185	>
186	>	awaitTermination(t);
187	>	}
188	>
189	>	/**
190	>	* A timeout in one party causes others waiting in timed await to
191	>	* throw BrokenBarrierException
192	>	*/
193	>	public void testAwait4_Timeout_BrokenBarrier() throws InterruptedException {
194	>	final CyclicBarrier c = new CyclicBarrier(3);
195	>	Thread t1 = newStartedThread(new CheckedRunnable() {
196	>	public void realRun() throws Exception {
197	>	try {
198	>	c.await(LONG_DELAY_MS, MILLISECONDS);
199	>	shouldThrow();
200	>	} catch (BrokenBarrierException success) {}
201	>	}});
202	>	Thread t2 = newStartedThread(new CheckedRunnable() {
203	>	public void realRun() throws Exception {
204	>	awaitNumberWaiting(c, 1);
205	>	long startTime = System.nanoTime();
206	>	try {
207	>	c.await(timeoutMillis(), MILLISECONDS);
208	>	shouldThrow();
209	>	} catch (TimeoutException success) {}
210	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
211	>	}});
212	>
213	>	awaitTermination(t1);
214	>	awaitTermination(t2);
215	>	}
216	>
217	>	/**
218	>	* A timeout in one party causes others waiting in await to
219	>	* throw BrokenBarrierException
220	>	*/
221	>	public void testAwait5_Timeout_BrokenBarrier() throws InterruptedException {
222	>	final CyclicBarrier c = new CyclicBarrier(3);
223	>	Thread t1 = newStartedThread(new CheckedRunnable() {
224	>	public void realRun() throws Exception {
225	>	try {
226	>	c.await();
227	>	shouldThrow();
228	>	} catch (BrokenBarrierException success) {}
229	>	}});
230	>	Thread t2 = newStartedThread(new CheckedRunnable() {
231	>	public void realRun() throws Exception {
232	>	awaitNumberWaiting(c, 1);
233	>	long startTime = System.nanoTime();
234	>	try {
235	>	c.await(timeoutMillis(), MILLISECONDS);
236	>	shouldThrow();
237	>	} catch (TimeoutException success) {}
238	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
239	>	}});
240	>
241	>	awaitTermination(t1);
242	>	awaitTermination(t2);
243	>	}
244	>
245	>	/**
246	>	* A reset of an active barrier causes waiting threads to throw
247	>	* BrokenBarrierException
248	>	*/
249	>	public void testReset_BrokenBarrier() throws InterruptedException {
250	>	final CyclicBarrier c = new CyclicBarrier(3);
251	>	final CountDownLatch pleaseReset = new CountDownLatch(2);
252	>	Thread t1 = new ThreadShouldThrow(BrokenBarrierException.class) {
253	>	public void realRun() throws Exception {
254	>	pleaseReset.countDown();
255	>	c.await();
256	>	}};
257	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
258	>	public void realRun() throws Exception {
259	>	pleaseReset.countDown();
260	>	c.await();
261	>	}};
262	>
263	>	t1.start();
264	>	t2.start();
265	>	await(pleaseReset);
266	>
267	>	awaitNumberWaiting(c, 2);
268	>	c.reset();
269	>	awaitTermination(t1);
270	>	awaitTermination(t2);
271	>	}
272	>
273	>	/**
274	>	* A reset before threads enter barrier does not throw
275	>	* BrokenBarrierException
276	>	*/
277	>	public void testReset_NoBrokenBarrier() throws Exception {
278	>	final CyclicBarrier c = new CyclicBarrier(3);
279	>	c.reset();
280	>
281	>	Thread t1 = newStartedThread(new CheckedRunnable() {
282	>	public void realRun() throws Exception {
283	>	c.await();
284	>	}});
285	>	Thread t2 = newStartedThread(new CheckedRunnable() {
286	>	public void realRun() throws Exception {
287	>	c.await();
288	>	}});
289	>
290	>	c.await();
291	>	awaitTermination(t1);
292	>	awaitTermination(t2);
293	>	}
294	>
295	>	/**
296	>	* All threads block while a barrier is broken.
297	>	*/
298	>	public void testReset_Leakage() throws InterruptedException {
299	>	final CyclicBarrier c = new CyclicBarrier(2);
300	>	final AtomicBoolean done = new AtomicBoolean();
301	>	Thread t = newStartedThread(new CheckedRunnable() {
302	>	public void realRun() {
303	>	while (!done.get()) {
304		try {
305	<	b.await();
306	<	b.await();
90	<	b.await();
91	<	b.await();
92	<	} catch(Exception e){
93	<	fail("unexpected exception");
94	<	}}});
305	>	while (c.isBroken())
306	>	c.reset();
307
308	<	try {
309	<	t.start();
310	<	b.await();
311	<	b.await();
312	<	b.await();
313	<	b.await();
314	<	t.join();
315	<	} catch(Exception e){
316	<	fail("unexpected exception");
308	>	c.await();
309	>	shouldThrow();
310	>	}
311	>	catch (BrokenBarrierException ok) {}
312	>	catch (InterruptedException ok) {}
313	>	}}});
314	>
315	>	for (int i = 0; i < 4; i++) {
316	>	delay(timeoutMillis());
317	>	t.interrupt();
318	>	}
319	>	done.set(true);
320	>	t.interrupt();
321	>	awaitTermination(t);
322	>	}
323	>
324	>	/**
325	>	* Reset of a non-broken barrier does not break barrier
326	>	*/
327	>	public void testResetWithoutBreakage() throws Exception {
328	>	final CyclicBarrier barrier = new CyclicBarrier(3);
329	>	for (int i = 0; i < 3; i++) {
330	>	final CyclicBarrier start = new CyclicBarrier(3);
331	>	Thread t1 = newStartedThread(new CheckedRunnable() {
332	>	public void realRun() throws Exception {
333	>	start.await();
334	>	barrier.await();
335	>	}});
336	>
337	>	Thread t2 = newStartedThread(new CheckedRunnable() {
338	>	public void realRun() throws Exception {
339	>	start.await();
340	>	barrier.await();
341	>	}});
342	>
343	>	start.await();
344	>	barrier.await();
345	>	awaitTermination(t1);
346	>	awaitTermination(t2);
347	>	assertFalse(barrier.isBroken());
348	>	assertEquals(0, barrier.getNumberWaiting());
349	>	if (i == 1) barrier.reset();
350	>	assertFalse(barrier.isBroken());
351	>	assertEquals(0, barrier.getNumberWaiting());
352		}
353		}
354
355	+	/**
356	+	* Reset of a barrier after interruption reinitializes it.
357	+	*/
358	+	public void testResetAfterInterrupt() throws Exception {
359	+	final CyclicBarrier barrier = new CyclicBarrier(3);
360	+	for (int i = 0; i < 2; i++) {
361	+	final CyclicBarrier start = new CyclicBarrier(3);
362	+	Thread t1 = new ThreadShouldThrow(InterruptedException.class) {
363	+	public void realRun() throws Exception {
364	+	start.await();
365	+	barrier.await();
366	+	}};
367	+
368	+	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
369	+	public void realRun() throws Exception {
370	+	start.await();
371	+	barrier.await();
372	+	}};
373
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 {
374		t1.start();
375		t2.start();
376	<	Thread.sleep(SHORT_DELAY_MS);
376	>	start.await();
377		t1.interrupt();
378	<	t1.join();
379	<	t2.join();
380	<	} catch(InterruptedException e){
381	<	fail("unexpected exception");
378	>	awaitTermination(t1);
379	>	awaitTermination(t2);
380	>	assertTrue(barrier.isBroken());
381	>	assertEquals(0, barrier.getNumberWaiting());
382	>	barrier.reset();
383	>	assertFalse(barrier.isBroken());
384	>	assertEquals(0, barrier.getNumberWaiting());
385		}
386		}
387
388	<	public void testAwait2_Interrupted_BrokenBarrier(){
389	<	final CyclicBarrier c = new CyclicBarrier(3);
390	<	Thread t1 = new Thread(new Runnable() {
391	<	public void run(){
392	<	try{
393	<	c.await(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
394	<	fail("should throw");
395	<	} catch(InterruptedException success){
396	<	} catch(Exception b){
397	<	fail("should throw IE");
398	<	}
399	<	}
400	<	});
401	<	Thread t2 = new Thread(new Runnable(){
402	<	public void run(){
403	<	try{
404	<	c.await(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
405	<	fail("should throw");
406	<	} catch(BrokenBarrierException success){
407	<	} catch(Exception i){
408	<	fail("should throw BBE");
409	<	}
410	<	}
411	<	});
412	<	try {
413	<	t1.start();
414	<	t2.start();
415	<	Thread.sleep(SHORT_DELAY_MS);
416	<	t1.interrupt();
417	<	t1.join();
418	<	t2.join();
419	<	} catch(InterruptedException e){
420	<	fail("unexpected exception");
388	>	/**
389	>	* Reset of a barrier after timeout reinitializes it.
390	>	*/
391	>	public void testResetAfterTimeout() throws Exception {
392	>	final CyclicBarrier barrier = new CyclicBarrier(3);
393	>	for (int i = 0; i < 2; i++) {
394	>	assertEquals(0, barrier.getNumberWaiting());
395	>	Thread t1 = newStartedThread(new CheckedRunnable() {
396	>	public void realRun() throws Exception {
397	>	try {
398	>	barrier.await();
399	>	shouldThrow();
400	>	} catch (BrokenBarrierException success) {}
401	>	}});
402	>	Thread t2 = newStartedThread(new CheckedRunnable() {
403	>	public void realRun() throws Exception {
404	>	awaitNumberWaiting(barrier, 1);
405	>	long startTime = System.nanoTime();
406	>	try {
407	>	barrier.await(timeoutMillis(), MILLISECONDS);
408	>	shouldThrow();
409	>	} catch (TimeoutException success) {}
410	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
411	>	}});
412	>
413	>	awaitTermination(t1);
414	>	awaitTermination(t2);
415	>	assertEquals(0, barrier.getNumberWaiting());
416	>	assertTrue(barrier.isBroken());
417	>	assertEquals(0, barrier.getNumberWaiting());
418	>	barrier.reset();
419	>	assertFalse(barrier.isBroken());
420	>	assertEquals(0, barrier.getNumberWaiting());
421		}
422		}
423	<
424	<	public void testAwait3_TimeOutException(){
425	<	final CyclicBarrier c = new CyclicBarrier(2);
426	<	Thread t = new Thread(new Runnable() {
427	<	public void run(){
428	<	try{
429	<	c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
430	<	fail("should throw");
431	<	} catch(TimeoutException success){
432	<	} catch(Exception b){
433	<	fail("should throw TOE");
434	<
435	<	}
436	<	}
437	<	});
438	<	try {
439	<	t.start();
440	<	t.join();
441	<	} catch(InterruptedException e){
442	<	fail("unexpected exception");
423	>
424	>	/**
425	>	* Reset of a barrier after a failed command reinitializes it.
426	>	*/
427	>	public void testResetAfterCommandException() throws Exception {
428	>	final CyclicBarrier barrier =
429	>	new CyclicBarrier(3, new Runnable() {
430	>	public void run() {
431	>	throw new NullPointerException(); }});
432	>	for (int i = 0; i < 2; i++) {
433	>	final CyclicBarrier start = new CyclicBarrier(3);
434	>	Thread t1 = new ThreadShouldThrow(BrokenBarrierException.class) {
435	>	public void realRun() throws Exception {
436	>	start.await();
437	>	barrier.await();
438	>	}};
439	>
440	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
441	>	public void realRun() throws Exception {
442	>	start.await();
443	>	barrier.await();
444	>	}};
445	>
446	>	t1.start();
447	>	t2.start();
448	>	start.await();
449	>	awaitNumberWaiting(barrier, 2);
450	>	try {
451	>	barrier.await();
452	>	shouldThrow();
453	>	} catch (NullPointerException success) {}
454	>	awaitTermination(t1);
455	>	awaitTermination(t2);
456	>	assertTrue(barrier.isBroken());
457	>	assertEquals(0, barrier.getNumberWaiting());
458	>	barrier.reset();
459	>	assertFalse(barrier.isBroken());
460	>	assertEquals(0, barrier.getNumberWaiting());
461		}
462		}
202	–
463		}

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