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Comparing jsr166/src/test/tck/CyclicBarrierTest.java (file contents):
Revision 1.5 by dl, Sun Oct 5 23:00:40 2003 UTC vs.
Revision 1.23 by jsr166, Sun May 29 15:31:36 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 JSR166TestCase{
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		}
20		public static Test suite() {
21	<	return new TestSuite(CyclicBarrierTest.class);
21	>	return new TestSuite(CyclicBarrierTest.class);
22		}
23
24		private volatile int countAction;
25		private class MyAction implements Runnable {
26		public void run() { ++countAction; }
27		}
28	<
28	>
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		*/
#	Line 29 | Line 45 | public class CyclicBarrierTest extends J
45		try {
46		new CyclicBarrier(-1, (Runnable)null);
47		shouldThrow();
48	<	} catch(IllegalArgumentException e){}
48	>	} catch (IllegalArgumentException success) {}
49		}
50
51		/**
#	Line 39 | Line 55 | public class CyclicBarrierTest extends J
55		try {
56		new CyclicBarrier(-1);
57		shouldThrow();
58	<	} catch(IllegalArgumentException e){}
58	>	} catch (IllegalArgumentException success) {}
59		}
60
61		/**
#	Line 47 | Line 63 | public class CyclicBarrierTest extends J
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		/**
71		* A 1-party barrier triggers after single await
72		*/
73	<	public void testSingleParty() {
74	<	try {
75	<	CyclicBarrier b = new CyclicBarrier(1);
76	<	assertEquals(1, b.getParties());
77	<	assertEquals(0, b.getNumberWaiting());
78	<	b.await();
79	<	b.await();
64	<	assertEquals(0, b.getNumberWaiting());
65	<	}
66	<	catch(Exception e) {
67	<	unexpectedException();
68	<	}
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	<
81	>
82		/**
83		* The supplied barrier action is run at barrier
84		*/
85	<	public void testBarrierAction() {
86	<	try {
87	<	countAction = 0;
88	<	CyclicBarrier b = new CyclicBarrier(1, new MyAction());
89	<	assertEquals(1, b.getParties());
90	<	assertEquals(0, b.getNumberWaiting());
91	<	b.await();
92	<	b.await();
93	<	assertEquals(0, b.getNumberWaiting());
83	<	assertEquals(countAction, 2);
84	<	}
85	<	catch(Exception e) {
86	<	unexpectedException();
87	<	}
85	>	public void testBarrierAction() throws Exception {
86	>	countAction = 0;
87	>	CyclicBarrier b = new CyclicBarrier(1, new MyAction());
88	>	assertEquals(1, b.getParties());
89	>	assertEquals(0, b.getNumberWaiting());
90	>	b.await();
91	>	b.await();
92	>	assertEquals(0, b.getNumberWaiting());
93	>	assertEquals(countAction, 2);
94		}
95
96		/**
97		* A 2-party/thread barrier triggers after both threads invoke await
98		*/
99	<	public void testTwoParties() {
99	>	public void testTwoParties() throws Exception {
100		final CyclicBarrier b = new CyclicBarrier(2);
101	<	Thread t = new Thread(new Runnable() {
102	<	public void run() {
103	<	try {
104	<	b.await();
105	<	b.await();
106	<	b.await();
107	<	b.await();
108	<	} catch(Exception e){
109	<	threadUnexpectedException();
110	<	}}});
111	<
112	<	try {
113	<	t.start();
108	<	b.await();
109	<	b.await();
110	<	b.await();
111	<	b.await();
112	<	t.join();
113	<	} catch(Exception e){
114	<	unexpectedException();
115	<	}
101	>	Thread t = newStartedThread(new CheckedRunnable() {
102	>	public void realRun() throws Exception {
103	>	b.await();
104	>	b.await();
105	>	b.await();
106	>	b.await();
107	>	}});
108	>
109	>	b.await();
110	>	b.await();
111	>	b.await();
112	>	b.await();
113	>	awaitTermination(t);
114		}
115
118	–
116		/**
117		* An interruption in one party causes others waiting in await to
118		* throw BrokenBarrierException
119		*/
120		public void testAwait1_Interrupted_BrokenBarrier() {
121		final CyclicBarrier c = new CyclicBarrier(3);
122	<	Thread t1 = new Thread(new Runnable() {
123	<	public void run() {
124	<	try {
125	<	c.await();
126	<	threadShouldThrow();
127	<	} catch(InterruptedException success){}
128	<	catch(Exception b){
129	<	threadUnexpectedException();
130	<	}
131	<	}
132	<	});
133	<	Thread t2 = new Thread(new Runnable() {
134	<	public void run() {
135	<	try {
136	<	c.await();
137	<	threadShouldThrow();
138	<	} catch(BrokenBarrierException success){
139	<	} catch(Exception i){
143	<	threadUnexpectedException();
144	<	}
145	<	}
146	<	});
147	<	try {
148	<	t1.start();
149	<	t2.start();
150	<	Thread.sleep(SHORT_DELAY_MS);
151	<	t1.interrupt();
152	<	t1.join();
153	<	t2.join();
154	<	} catch(InterruptedException e){
155	<	unexpectedException();
156	<	}
122	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(2);
123	>	Thread t1 = new ThreadShouldThrow(InterruptedException.class) {
124	>	public void realRun() throws Exception {
125	>	pleaseInterrupt.countDown();
126	>	c.await();
127	>	}};
128	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
129	>	public void realRun() throws Exception {
130	>	pleaseInterrupt.countDown();
131	>	c.await();
132	>	}};
133	>
134	>	t1.start();
135	>	t2.start();
136	>	await(pleaseInterrupt);
137	>	t1.interrupt();
138	>	awaitTermination(t1);
139	>	awaitTermination(t2);
140		}
141
142		/**
143		* An interruption in one party causes others waiting in timed await to
144		* throw BrokenBarrierException
145		*/
146	<	public void testAwait2_Interrupted_BrokenBarrier() {
147	<	final CyclicBarrier c = new CyclicBarrier(3);
148	<	Thread t1 = new Thread(new Runnable() {
149	<	public void run() {
150	<	try {
151	<	c.await(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
152	<	threadShouldThrow();
153	<	} catch(InterruptedException success){
154	<	} catch(Exception b){
155	<	threadUnexpectedException();
156	<	}
157	<	}
158	<	});
159	<	Thread t2 = new Thread(new Runnable() {
160	<	public void run() {
161	<	try {
162	<	c.await(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
163	<	threadShouldThrow();
164	<	} catch(BrokenBarrierException success){
165	<	} catch(Exception i){
183	<	threadUnexpectedException();
184	<	}
185	<	}
186	<	});
187	<	try {
188	<	t1.start();
189	<	t2.start();
190	<	Thread.sleep(SHORT_DELAY_MS);
191	<	t1.interrupt();
192	<	t1.join();
193	<	t2.join();
194	<	} catch(InterruptedException e){
195	<	unexpectedException();
196	<	}
146	>	public void testAwait2_Interrupted_BrokenBarrier() throws Exception {
147	>	final CyclicBarrier c = new CyclicBarrier(3);
148	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(2);
149	>	Thread t1 = new ThreadShouldThrow(InterruptedException.class) {
150	>	public void realRun() throws Exception {
151	>	pleaseInterrupt.countDown();
152	>	c.await(LONG_DELAY_MS, MILLISECONDS);
153	>	}};
154	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
155	>	public void realRun() throws Exception {
156	>	pleaseInterrupt.countDown();
157	>	c.await(LONG_DELAY_MS, MILLISECONDS);
158	>	}};
159	>
160	>	t1.start();
161	>	t2.start();
162	>	await(pleaseInterrupt);
163	>	t1.interrupt();
164	>	awaitTermination(t1);
165	>	awaitTermination(t2);
166		}
167	<
167	>
168		/**
169		* A timeout in timed await throws TimeoutException
170		*/
171	<	public void testAwait3_TimeOutException() {
171	>	public void testAwait3_TimeoutException() throws InterruptedException {
172		final CyclicBarrier c = new CyclicBarrier(2);
173	<	Thread t = new Thread(new Runnable() {
174	<	public void run() {
175	<	try {
176	<	c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
177	<	threadShouldThrow();
178	<	} catch(TimeoutException success){
179	<	} catch(Exception b){
180	<	threadUnexpectedException();
181	<
182	<	}
183	<	}
215	<	});
216	<	try {
217	<	t.start();
218	<	t.join();
219	<	} catch(InterruptedException e){
220	<	unexpectedException();
221	<	}
173	>	Thread t = newStartedThread(new CheckedRunnable() {
174	>	public void realRun() throws Exception {
175	>	long startTime = System.nanoTime();
176	>	try {
177	>	c.await(timeoutMillis(), MILLISECONDS);
178	>	shouldThrow();
179	>	} catch (TimeoutException success) {}
180	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
181	>	}});
182	>
183	>	awaitTermination(t);
184		}
185
186		/**
187		* A timeout in one party causes others waiting in timed await to
188		* throw BrokenBarrierException
189		*/
190	<	public void testAwait4_Timeout_BrokenBarrier() {
191	<	final CyclicBarrier c = new CyclicBarrier(3);
192	<	Thread t1 = new Thread(new Runnable() {
193	<	public void run() {
194	<	try {
195	<	c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
196	<	threadShouldThrow();
197	<	} catch(TimeoutException success){
198	<	} catch(Exception b){
199	<	threadUnexpectedException();
200	<	}
201	<	}
202	<	});
203	<	Thread t2 = new Thread(new Runnable() {
204	<	public void run() {
205	<	try {
206	<	c.await(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
207	<	threadShouldThrow();
208	<	} catch(BrokenBarrierException success){
209	<	} catch(Exception i){
210	<	threadUnexpectedException();
211	<	}
250	<	}
251	<	});
252	<	try {
253	<	t1.start();
254	<	t2.start();
255	<	t1.join();
256	<	t2.join();
257	<	} catch(InterruptedException e){
258	<	unexpectedException();
259	<	}
190	>	public void testAwait4_Timeout_BrokenBarrier() throws InterruptedException {
191	>	final CyclicBarrier c = new CyclicBarrier(3);
192	>	Thread t1 = newStartedThread(new CheckedRunnable() {
193	>	public void realRun() throws Exception {
194	>	try {
195	>	c.await(LONG_DELAY_MS, MILLISECONDS);
196	>	shouldThrow();
197	>	} catch (BrokenBarrierException success) {}
198	>	}});
199	>	Thread t2 = newStartedThread(new CheckedRunnable() {
200	>	public void realRun() throws Exception {
201	>	awaitNumberWaiting(c, 1);
202	>	long startTime = System.nanoTime();
203	>	try {
204	>	c.await(timeoutMillis(), MILLISECONDS);
205	>	shouldThrow();
206	>	} catch (TimeoutException success) {}
207	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
208	>	}});
209	>
210	>	awaitTermination(t1);
211	>	awaitTermination(t2);
212		}
213
214		/**
215		* A timeout in one party causes others waiting in await to
216		* throw BrokenBarrierException
217		*/
218	<	public void testAwait5_Timeout_BrokenBarrier() {
219	<	final CyclicBarrier c = new CyclicBarrier(3);
220	<	Thread t1 = new Thread(new Runnable() {
221	<	public void run() {
222	<	try {
223	<	c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
224	<	threadShouldThrow();
225	<	} catch(TimeoutException success){
226	<	} catch(Exception b){
227	<	threadUnexpectedException();
228	<	}
229	<	}
230	<	});
231	<	Thread t2 = new Thread(new Runnable() {
232	<	public void run() {
233	<	try {
234	<	c.await();
235	<	threadShouldThrow();
236	<	} catch(BrokenBarrierException success){
237	<	} catch(Exception i){
238	<	threadUnexpectedException();
239	<	}
288	<	}
289	<	});
290	<	try {
291	<	t1.start();
292	<	t2.start();
293	<	t1.join();
294	<	t2.join();
295	<	} catch(InterruptedException e){
296	<	unexpectedException();
297	<	}
218	>	public void testAwait5_Timeout_BrokenBarrier() throws InterruptedException {
219	>	final CyclicBarrier c = new CyclicBarrier(3);
220	>	Thread t1 = newStartedThread(new CheckedRunnable() {
221	>	public void realRun() throws Exception {
222	>	try {
223	>	c.await();
224	>	shouldThrow();
225	>	} catch (BrokenBarrierException success) {}
226	>	}});
227	>	Thread t2 = newStartedThread(new CheckedRunnable() {
228	>	public void realRun() throws Exception {
229	>	awaitNumberWaiting(c, 1);
230	>	long startTime = System.nanoTime();
231	>	try {
232	>	c.await(timeoutMillis(), MILLISECONDS);
233	>	shouldThrow();
234	>	} catch (TimeoutException success) {}
235	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
236	>	}});
237	>
238	>	awaitTermination(t1);
239	>	awaitTermination(t2);
240		}
241	<
241	>
242		/**
243		* A reset of an active barrier causes waiting threads to throw
244		* BrokenBarrierException
245		*/
246	<	public void testReset_BrokenBarrier() {
246	>	public void testReset_BrokenBarrier() throws InterruptedException {
247		final CyclicBarrier c = new CyclicBarrier(3);
248	<	Thread t1 = new Thread(new Runnable() {
249	<	public void run() {
250	<	try {
251	<	c.await();
252	<	threadShouldThrow();
253	<	} catch(BrokenBarrierException success){}
254	<	catch(Exception b){
255	<	threadUnexpectedException();
256	<	}
257	<	}
258	<	});
259	<	Thread t2 = new Thread(new Runnable() {
260	<	public void run() {
261	<	try {
262	<	c.await();
263	<	threadShouldThrow();
264	<	} catch(BrokenBarrierException success){
265	<	} catch(Exception i){
266	<	threadUnexpectedException();
267	<	}
326	<	}
327	<	});
328	<	try {
329	<	t1.start();
330	<	t2.start();
331	<	Thread.sleep(SHORT_DELAY_MS);
332	<	c.reset();
333	<	t1.join();
334	<	t2.join();
335	<	} catch(InterruptedException e){
336	<	unexpectedException();
337	<	}
248	>	final CountDownLatch pleaseReset = new CountDownLatch(2);
249	>	Thread t1 = new ThreadShouldThrow(BrokenBarrierException.class) {
250	>	public void realRun() throws Exception {
251	>	pleaseReset.countDown();
252	>	c.await();
253	>	}};
254	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
255	>	public void realRun() throws Exception {
256	>	pleaseReset.countDown();
257	>	c.await();
258	>	}};
259	>
260	>	t1.start();
261	>	t2.start();
262	>	await(pleaseReset);
263	>
264	>	awaitNumberWaiting(c, 2);
265	>	c.reset();
266	>	awaitTermination(t1);
267	>	awaitTermination(t2);
268		}
269
270		/**
271		* A reset before threads enter barrier does not throw
272		* BrokenBarrierException
273		*/
274	<	public void testReset_NoBrokenBarrier() {
274	>	public void testReset_NoBrokenBarrier() throws Exception {
275		final CyclicBarrier c = new CyclicBarrier(3);
276	<	Thread t1 = new Thread(new Runnable() {
277	<	public void run() {
278	<	try {
279	<	c.await();
280	<	} catch(Exception b){
281	<	threadUnexpectedException();
282	<	}
283	<	}
284	<	});
285	<	Thread t2 = new Thread(new Runnable() {
286	<	public void run() {
276	>	c.reset();
277	>
278	>	Thread t1 = newStartedThread(new CheckedRunnable() {
279	>	public void realRun() throws Exception {
280	>	c.await();
281	>	}});
282	>	Thread t2 = newStartedThread(new CheckedRunnable() {
283	>	public void realRun() throws Exception {
284	>	c.await();
285	>	}});
286	>
287	>	c.await();
288	>	awaitTermination(t1);
289	>	awaitTermination(t2);
290	>	}
291	>
292	>	/**
293	>	* All threads block while a barrier is broken.
294	>	*/
295	>	public void testReset_Leakage() throws InterruptedException {
296	>	final CyclicBarrier c = new CyclicBarrier(2);
297	>	final AtomicBoolean done = new AtomicBoolean();
298	>	Thread t = newStartedThread(new CheckedRunnable() {
299	>	public void realRun() {
300	>	while (!done.get()) {
301		try {
302	+	while (c.isBroken())
303	+	c.reset();
304	+
305		c.await();
306	<	} catch(Exception i){
360	<	threadUnexpectedException();
306	>	shouldThrow();
307		}
308	<	}
309	<	});
310	<	try {
311	<	c.reset();
308	>	catch (BrokenBarrierException ok) {}
309	>	catch (InterruptedException ok) {}
310	>	}}});
311	>
312	>	for (int i = 0; i < 4; i++) {
313	>	delay(timeoutMillis());
314	>	t.interrupt();
315	>	}
316	>	done.set(true);
317	>	t.interrupt();
318	>	awaitTermination(t);
319	>	}
320	>
321	>	/**
322	>	* Reset of a non-broken barrier does not break barrier
323	>	*/
324	>	public void testResetWithoutBreakage() throws Exception {
325	>	final CyclicBarrier barrier = new CyclicBarrier(3);
326	>	for (int i = 0; i < 3; i++) {
327	>	final CyclicBarrier start = new CyclicBarrier(3);
328	>	Thread t1 = newStartedThread(new CheckedRunnable() {
329	>	public void realRun() throws Exception {
330	>	start.await();
331	>	barrier.await();
332	>	}});
333	>
334	>	Thread t2 = newStartedThread(new CheckedRunnable() {
335	>	public void realRun() throws Exception {
336	>	start.await();
337	>	barrier.await();
338	>	}});
339	>
340	>	start.await();
341	>	barrier.await();
342	>	awaitTermination(t1);
343	>	awaitTermination(t2);
344	>	assertFalse(barrier.isBroken());
345	>	assertEquals(0, barrier.getNumberWaiting());
346	>	if (i == 1) barrier.reset();
347	>	assertFalse(barrier.isBroken());
348	>	assertEquals(0, barrier.getNumberWaiting());
349	>	}
350	>	}
351	>
352	>	/**
353	>	* Reset of a barrier after interruption reinitializes it.
354	>	*/
355	>	public void testResetAfterInterrupt() throws Exception {
356	>	final CyclicBarrier barrier = new CyclicBarrier(3);
357	>	for (int i = 0; i < 2; i++) {
358	>	final CyclicBarrier start = new CyclicBarrier(3);
359	>	Thread t1 = new ThreadShouldThrow(InterruptedException.class) {
360	>	public void realRun() throws Exception {
361	>	start.await();
362	>	barrier.await();
363	>	}};
364	>
365	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
366	>	public void realRun() throws Exception {
367	>	start.await();
368	>	barrier.await();
369	>	}};
370	>
371	>	t1.start();
372	>	t2.start();
373	>	start.await();
374	>	t1.interrupt();
375	>	awaitTermination(t1);
376	>	awaitTermination(t2);
377	>	assertTrue(barrier.isBroken());
378	>	assertEquals(0, barrier.getNumberWaiting());
379	>	barrier.reset();
380	>	assertFalse(barrier.isBroken());
381	>	assertEquals(0, barrier.getNumberWaiting());
382	>	}
383	>	}
384	>
385	>	/**
386	>	* Reset of a barrier after timeout reinitializes it.
387	>	*/
388	>	public void testResetAfterTimeout() throws Exception {
389	>	final CyclicBarrier barrier = new CyclicBarrier(3);
390	>	for (int i = 0; i < 2; i++) {
391	>	assertEquals(0, barrier.getNumberWaiting());
392	>	Thread t1 = newStartedThread(new CheckedRunnable() {
393	>	public void realRun() throws Exception {
394	>	try {
395	>	barrier.await();
396	>	shouldThrow();
397	>	} catch (BrokenBarrierException success) {}
398	>	}});
399	>	Thread t2 = newStartedThread(new CheckedRunnable() {
400	>	public void realRun() throws Exception {
401	>	awaitNumberWaiting(barrier, 1);
402	>	long startTime = System.nanoTime();
403	>	try {
404	>	barrier.await(timeoutMillis(), MILLISECONDS);
405	>	shouldThrow();
406	>	} catch (TimeoutException success) {}
407	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
408	>	}});
409	>
410	>	awaitTermination(t1);
411	>	awaitTermination(t2);
412	>	assertEquals(0, barrier.getNumberWaiting());
413	>	assertTrue(barrier.isBroken());
414	>	assertEquals(0, barrier.getNumberWaiting());
415	>	barrier.reset();
416	>	assertFalse(barrier.isBroken());
417	>	assertEquals(0, barrier.getNumberWaiting());
418	>	}
419	>	}
420	>
421	>	/**
422	>	* Reset of a barrier after a failed command reinitializes it.
423	>	*/
424	>	public void testResetAfterCommandException() throws Exception {
425	>	final CyclicBarrier barrier =
426	>	new CyclicBarrier(3, new Runnable() {
427	>	public void run() {
428	>	throw new NullPointerException(); }});
429	>	for (int i = 0; i < 2; i++) {
430	>	final CyclicBarrier start = new CyclicBarrier(3);
431	>	Thread t1 = new ThreadShouldThrow(BrokenBarrierException.class) {
432	>	public void realRun() throws Exception {
433	>	start.await();
434	>	barrier.await();
435	>	}};
436	>
437	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
438	>	public void realRun() throws Exception {
439	>	start.await();
440	>	barrier.await();
441	>	}};
442	>
443		t1.start();
444		t2.start();
445	<	c.await();
446	<	t1.join();
447	<	t2.join();
448	<	} catch(Exception e){
449	<	unexpectedException();
445	>	start.await();
446	>	awaitNumberWaiting(barrier, 2);
447	>	try {
448	>	barrier.await();
449	>	shouldThrow();
450	>	} catch (NullPointerException success) {}
451	>	awaitTermination(t1);
452	>	awaitTermination(t2);
453	>	assertTrue(barrier.isBroken());
454	>	assertEquals(0, barrier.getNumberWaiting());
455	>	barrier.reset();
456	>	assertFalse(barrier.isBroken());
457	>	assertEquals(0, barrier.getNumberWaiting());
458		}
459		}
375	–
460		}

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