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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 1.20 by jsr166, Fri May 27 20:07:24 2011 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.*;
10		import java.util.*;
11		import java.util.concurrent.*;
12	+	import java.util.concurrent.locks.*;
13	+	import java.util.concurrent.atomic.*;
14	+	import static java.util.concurrent.TimeUnit.MILLISECONDS;
15
16	<	public class CyclicBarrierTest extends TestCase{
13	<
16	>	public class CyclicBarrierTest extends JSR166TestCase {
17		public static void main(String[] args) {
18	<	junit.textui.TestRunner.run (suite());
18	>	junit.textui.TestRunner.run(suite());
19		}
17	–
18	–
20		public static Test suite() {
21	<	return new TestSuite(CyclicBarrierTest.class);
21	>	return new TestSuite(CyclicBarrierTest.class);
22		}
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;
23
24	<	public void testConstructor1(){
25	<	try{
24	>	private volatile int countAction;
25	>	private class MyAction implements Runnable {
26	>	public void run() { ++countAction; }
27	>	}
28	>
29	>	/**
30	>	* Creating with negative parties throws IAE
31	>	*/
32	>	public void testConstructor1() {
33	>	try {
34		new CyclicBarrier(-1, (Runnable)null);
35	<	fail("should throw");
36	<	} catch(IllegalArgumentException e){}
35	>	shouldThrow();
36	>	} catch (IllegalArgumentException success) {}
37		}
38
39	<	public void testConstructor2(){
40	<	try{
39	>	/**
40	>	* Creating with negative parties and no action throws IAE
41	>	*/
42	>	public void testConstructor2() {
43	>	try {
44		new CyclicBarrier(-1);
45	<	fail("should throw");
46	<	} catch(IllegalArgumentException e){}
45	>	shouldThrow();
46	>	} catch (IllegalArgumentException success) {}
47		}
48
49	<	public void testConstructor3(){
49	>	/**
50	>	* getParties returns the number of parties given in constructor
51	>	*/
52	>	public void testGetParties() {
53		CyclicBarrier b = new CyclicBarrier(2);
54	<	assertEquals(2, b.getParties());
54	>	assertEquals(2, b.getParties());
55		assertEquals(0, b.getNumberWaiting());
56		}
57
58	<	public void testSingleParty() {
59	<	try {
60	<	CyclicBarrier b = new CyclicBarrier(1);
61	<	assertEquals(1, b.getParties());
62	<	assertEquals(0, b.getNumberWaiting());
63	<	b.await();
64	<	b.await();
65	<	assertEquals(0, b.getNumberWaiting());
66	<	}
67	<	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; }
58	>	/**
59	>	* A 1-party barrier triggers after single await
60	>	*/
61	>	public void testSingleParty() throws Exception {
62	>	CyclicBarrier b = new CyclicBarrier(1);
63	>	assertEquals(1, b.getParties());
64	>	assertEquals(0, b.getNumberWaiting());
65	>	b.await();
66	>	b.await();
67	>	assertEquals(0, b.getNumberWaiting());
68		}
69
70	<	public void testBarrierAction() {
71	<	try {
72	<	countAction = 0;
73	<	CyclicBarrier b = new CyclicBarrier(1, new MyAction());
74	<	assertEquals(1, b.getParties());
75	<	assertEquals(0, b.getNumberWaiting());
76	<	b.await();
77	<	b.await();
78	<	assertEquals(0, b.getNumberWaiting());
79	<	assertEquals(countAction, 2);
80	<	}
81	<	catch(Exception e) {
78	<	fail("unexpected exception");
79	<	}
70	>	/**
71	>	* The supplied barrier action is run at barrier
72	>	*/
73	>	public void testBarrierAction() throws Exception {
74	>	countAction = 0;
75	>	CyclicBarrier b = new CyclicBarrier(1, new MyAction());
76	>	assertEquals(1, b.getParties());
77	>	assertEquals(0, b.getNumberWaiting());
78	>	b.await();
79	>	b.await();
80	>	assertEquals(0, b.getNumberWaiting());
81	>	assertEquals(countAction, 2);
82		}
83
84	<
85	<	public void testTwoParties(){
84	>	/**
85	>	* A 2-party/thread barrier triggers after both threads invoke await
86	>	*/
87	>	public void testTwoParties() throws Exception {
88		final CyclicBarrier b = new CyclicBarrier(2);
89	<	Thread t = new Thread(new Runnable() {
90	<	public void run(){
89	>	Thread t = new Thread(new CheckedRunnable() {
90	>	public void realRun() throws Exception {
91	>	b.await();
92	>	b.await();
93	>	b.await();
94	>	b.await();
95	>	}});
96	>
97	>	t.start();
98	>	b.await();
99	>	b.await();
100	>	b.await();
101	>	b.await();
102	>	t.join();
103	>	}
104	>
105	>	/**
106	>	* An interruption in one party causes others waiting in await to
107	>	* throw BrokenBarrierException
108	>	*/
109	>	public void testAwait1_Interrupted_BrokenBarrier() throws Exception {
110	>	final CyclicBarrier c = new CyclicBarrier(3);
111	>	Thread t1 = new ThreadShouldThrow(InterruptedException.class) {
112	>	public void realRun() throws Exception {
113	>	c.await();
114	>	}};
115	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
116	>	public void realRun() throws Exception {
117	>	c.await();
118	>	}};
119	>
120	>	t1.start();
121	>	t2.start();
122	>	delay(SHORT_DELAY_MS);
123	>	t1.interrupt();
124	>	t1.join();
125	>	t2.join();
126	>	}
127	>
128	>	/**
129	>	* An interruption in one party causes others waiting in timed await to
130	>	* throw BrokenBarrierException
131	>	*/
132	>	public void testAwait2_Interrupted_BrokenBarrier() throws Exception {
133	>	final CyclicBarrier c = new CyclicBarrier(3);
134	>	Thread t1 = new ThreadShouldThrow(InterruptedException.class) {
135	>	public void realRun() throws Exception {
136	>	c.await(LONG_DELAY_MS, MILLISECONDS);
137	>	}};
138	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
139	>	public void realRun() throws Exception {
140	>	c.await(LONG_DELAY_MS, MILLISECONDS);
141	>	}};
142	>
143	>	t1.start();
144	>	t2.start();
145	>	delay(SHORT_DELAY_MS);
146	>	t1.interrupt();
147	>	t1.join();
148	>	t2.join();
149	>	}
150	>
151	>	/**
152	>	* A timeout in timed await throws TimeoutException
153	>	*/
154	>	public void testAwait3_TimeoutException() throws InterruptedException {
155	>	final CyclicBarrier c = new CyclicBarrier(2);
156	>	Thread t = new ThreadShouldThrow(TimeoutException.class) {
157	>	public void realRun() throws Exception {
158	>	c.await(SHORT_DELAY_MS, MILLISECONDS);
159	>	}};
160	>
161	>	t.start();
162	>	t.join();
163	>	}
164	>
165	>	/**
166	>	* A timeout in one party causes others waiting in timed await to
167	>	* throw BrokenBarrierException
168	>	*/
169	>	public void testAwait4_Timeout_BrokenBarrier() throws InterruptedException {
170	>	final CyclicBarrier c = new CyclicBarrier(3);
171	>	Thread t1 = new ThreadShouldThrow(TimeoutException.class) {
172	>	public void realRun() throws Exception {
173	>	c.await(SHORT_DELAY_MS, MILLISECONDS);
174	>	}};
175	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
176	>	public void realRun() throws Exception {
177	>	c.await(MEDIUM_DELAY_MS, MILLISECONDS);
178	>	}};
179	>
180	>	t1.start();
181	>	t2.start();
182	>	t1.join();
183	>	t2.join();
184	>	}
185	>
186	>	/**
187	>	* A timeout in one party causes others waiting in await to
188	>	* throw BrokenBarrierException
189	>	*/
190	>	public void testAwait5_Timeout_BrokenBarrier() throws InterruptedException {
191	>	final CyclicBarrier c = new CyclicBarrier(3);
192	>	Thread t1 = new ThreadShouldThrow(TimeoutException.class) {
193	>	public void realRun() throws Exception {
194	>	c.await(SHORT_DELAY_MS, MILLISECONDS);
195	>	}};
196	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
197	>	public void realRun() throws Exception {
198	>	c.await();
199	>	}};
200	>
201	>	t1.start();
202	>	t2.start();
203	>	t1.join();
204	>	t2.join();
205	>	}
206	>
207	>	/**
208	>	* A reset of an active barrier causes waiting threads to throw
209	>	* BrokenBarrierException
210	>	*/
211	>	public void testReset_BrokenBarrier() throws InterruptedException {
212	>	final CyclicBarrier c = new CyclicBarrier(3);
213	>	Thread t1 = new ThreadShouldThrow(BrokenBarrierException.class) {
214	>	public void realRun() throws Exception {
215	>	c.await();
216	>	}};
217	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
218	>	public void realRun() throws Exception {
219	>	c.await();
220	>	}};
221	>
222	>	t1.start();
223	>	t2.start();
224	>	delay(SHORT_DELAY_MS);
225	>	c.reset();
226	>	t1.join();
227	>	t2.join();
228	>	}
229	>
230	>	/**
231	>	* A reset before threads enter barrier does not throw
232	>	* BrokenBarrierException
233	>	*/
234	>	public void testReset_NoBrokenBarrier() throws Exception {
235	>	final CyclicBarrier c = new CyclicBarrier(3);
236	>	Thread t1 = new Thread(new CheckedRunnable() {
237	>	public void realRun() throws Exception {
238	>	c.await();
239	>	}});
240	>	Thread t2 = new Thread(new CheckedRunnable() {
241	>	public void realRun() throws Exception {
242	>	c.await();
243	>	}});
244	>
245	>	c.reset();
246	>	t1.start();
247	>	t2.start();
248	>	c.await();
249	>	t1.join();
250	>	t2.join();
251	>	}
252	>
253	>	/**
254	>	* All threads block while a barrier is broken.
255	>	*/
256	>	public void testReset_Leakage() throws InterruptedException {
257	>	final CyclicBarrier c = new CyclicBarrier(2);
258	>	final AtomicBoolean done = new AtomicBoolean();
259	>	Thread t = new Thread(new CheckedRunnable() {
260	>	public void realRun() {
261	>	while (!done.get()) {
262		try {
263	<	b.await();
264	<	b.await();
90	<	b.await();
91	<	b.await();
92	<	} catch(Exception e){
93	<	fail("unexpected exception");
94	<	}}});
263	>	while (c.isBroken())
264	>	c.reset();
265
266	<	try {
267	<	t.start();
268	<	b.await();
269	<	b.await();
270	<	b.await();
271	<	b.await();
272	<	t.join();
273	<	} catch(Exception e){
274	<	fail("unexpected exception");
266	>	c.await();
267	>	shouldThrow();
268	>	}
269	>	catch (BrokenBarrierException ok) {}
270	>	catch (InterruptedException ok) {}
271	>	}}});
272	>
273	>	t.start();
274	>	for (int i = 0; i < 4; i++) {
275	>	delay(timeoutMillis());
276	>	t.interrupt();
277	>	}
278	>	done.set(true);
279	>	t.interrupt();
280	>	awaitTermination(t);
281	>	}
282	>
283	>	/**
284	>	* Reset of a non-broken barrier does not break barrier
285	>	*/
286	>	public void testResetWithoutBreakage() throws Exception {
287	>	final CyclicBarrier start = new CyclicBarrier(3);
288	>	final CyclicBarrier barrier = new CyclicBarrier(3);
289	>	for (int i = 0; i < 3; i++) {
290	>	Thread t1 = new Thread(new CheckedRunnable() {
291	>	public void realRun() throws Exception {
292	>	start.await();
293	>	barrier.await();
294	>	}});
295	>
296	>	Thread t2 = new Thread(new CheckedRunnable() {
297	>	public void realRun() throws Exception {
298	>	start.await();
299	>	barrier.await();
300	>	}});
301	>
302	>	t1.start();
303	>	t2.start();
304	>	start.await();
305	>	barrier.await();
306	>	t1.join();
307	>	t2.join();
308	>	assertFalse(barrier.isBroken());
309	>	assertEquals(0, barrier.getNumberWaiting());
310	>	if (i == 1) barrier.reset();
311	>	assertFalse(barrier.isBroken());
312	>	assertEquals(0, barrier.getNumberWaiting());
313		}
314		}
315
316	+	/**
317	+	* Reset of a barrier after interruption reinitializes it.
318	+	*/
319	+	public void testResetAfterInterrupt() throws Exception {
320	+	final CyclicBarrier start = new CyclicBarrier(3);
321	+	final CyclicBarrier barrier = new CyclicBarrier(3);
322	+	for (int i = 0; i < 2; i++) {
323	+	Thread t1 = new ThreadShouldThrow(InterruptedException.class) {
324	+	public void realRun() throws Exception {
325	+	start.await();
326	+	barrier.await();
327	+	}};
328	+
329	+	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
330	+	public void realRun() throws Exception {
331	+	start.await();
332	+	barrier.await();
333	+	}};
334
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 {
335		t1.start();
336		t2.start();
337	<	Thread.sleep(SHORT_DELAY_MS);
337	>	start.await();
338		t1.interrupt();
339	<	t1.join();
339	>	t1.join();
340		t2.join();
341	<	} catch(InterruptedException e){
342	<	fail("unexpected exception");
341	>	assertTrue(barrier.isBroken());
342	>	assertEquals(0, barrier.getNumberWaiting());
343	>	barrier.reset();
344	>	assertFalse(barrier.isBroken());
345	>	assertEquals(0, barrier.getNumberWaiting());
346		}
347		}
348
349	<	public void testAwait2_Interrupted_BrokenBarrier(){
350	<	final CyclicBarrier c = new CyclicBarrier(3);
351	<	Thread t1 = new Thread(new Runnable() {
352	<	public void run(){
353	<	try{
354	<	c.await(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
355	<	fail("should throw");
356	<	} catch(InterruptedException success){
357	<	} catch(Exception b){
358	<	fail("should throw IE");
359	<	}
360	<	}
361	<	});
362	<	Thread t2 = new Thread(new Runnable(){
363	<	public void run(){
364	<	try{
365	<	c.await(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
366	<	fail("should throw");
367	<	} catch(BrokenBarrierException success){
164	<	} catch(Exception i){
165	<	fail("should throw BBE");
166	<	}
167	<	}
168	<	});
169	<	try {
349	>	/**
350	>	* Reset of a barrier after timeout reinitializes it.
351	>	*/
352	>	public void testResetAfterTimeout() throws Exception {
353	>	final CyclicBarrier start = new CyclicBarrier(2);
354	>	final CyclicBarrier barrier = new CyclicBarrier(3);
355	>	for (int i = 0; i < 2; i++) {
356	>	Thread t1 = new ThreadShouldThrow(TimeoutException.class) {
357	>	public void realRun() throws Exception {
358	>	start.await();
359	>	barrier.await(SHORT_DELAY_MS, MILLISECONDS);
360	>	}};
361	>
362	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
363	>	public void realRun() throws Exception {
364	>	start.await();
365	>	barrier.await();
366	>	}};
367	>
368		t1.start();
369		t2.start();
370	<	Thread.sleep(SHORT_DELAY_MS);
173	<	t1.interrupt();
174	<	t1.join();
370	>	t1.join();
371		t2.join();
372	<	} catch(InterruptedException e){
373	<	fail("unexpected exception");
372	>	assertTrue(barrier.isBroken());
373	>	assertEquals(0, barrier.getNumberWaiting());
374	>	barrier.reset();
375	>	assertFalse(barrier.isBroken());
376	>	assertEquals(0, barrier.getNumberWaiting());
377		}
378		}
379	<
380	<	public void testAwait3_TimeOutException(){
381	<	final CyclicBarrier c = new CyclicBarrier(2);
382	<	Thread t = new Thread(new Runnable() {
383	<	public void run(){
384	<	try{
385	<	c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
386	<	fail("should throw");
387	<	} catch(TimeoutException success){
388	<	} catch(Exception b){
389	<	fail("should throw TOE");
390	<
391	<	}
392	<	}
393	<	});
394	<	try {
395	<	t.start();
396	<	t.join();
397	<	} catch(InterruptedException e){
398	<	fail("unexpected exception");
379	>
380	>	/**
381	>	* Reset of a barrier after a failed command reinitializes it.
382	>	*/
383	>	public void testResetAfterCommandException() throws Exception {
384	>	final CyclicBarrier start = new CyclicBarrier(3);
385	>	final CyclicBarrier barrier =
386	>	new CyclicBarrier(3, new Runnable() {
387	>	public void run() {
388	>	throw new NullPointerException(); }});
389	>	for (int i = 0; i < 2; i++) {
390	>	Thread t1 = new ThreadShouldThrow(BrokenBarrierException.class) {
391	>	public void realRun() throws Exception {
392	>	start.await();
393	>	barrier.await();
394	>	}};
395	>
396	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
397	>	public void realRun() throws Exception {
398	>	start.await();
399	>	barrier.await();
400	>	}};
401	>
402	>	t1.start();
403	>	t2.start();
404	>	start.await();
405	>	while (barrier.getNumberWaiting() < 2) { Thread.yield(); }
406	>	try {
407	>	barrier.await();
408	>	shouldThrow();
409	>	} catch (NullPointerException success) {}
410	>	t1.join();
411	>	t2.join();
412	>	assertTrue(barrier.isBroken());
413	>	assertEquals(0, barrier.getNumberWaiting());
414	>	barrier.reset();
415	>	assertFalse(barrier.isBroken());
416	>	assertEquals(0, barrier.getNumberWaiting());
417		}
418		}
202	–
419		}

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