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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 1.34 by jsr166, Mon Sep 9 00:46:44 2019 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 JSR166TestCase{
11	>	import java.util.concurrent.BrokenBarrierException;
12	>	import java.util.concurrent.CountDownLatch;
13	>	import java.util.concurrent.CyclicBarrier;
14	>	import java.util.concurrent.ExecutorService;
15	>	import java.util.concurrent.Executors;
16	>	import java.util.concurrent.ThreadLocalRandom;
17	>	import java.util.concurrent.TimeoutException;
18	>	import java.util.concurrent.atomic.AtomicInteger;
19	>
20	>	import junit.framework.Test;
21	>	import junit.framework.TestSuite;
22	>
23	>	public class CyclicBarrierTest extends JSR166TestCase {
24		public static void main(String[] args) {
25	<	junit.textui.TestRunner.run (suite());
25	>	main(suite(), args);
26		}
27		public static Test suite() {
28	<	return new TestSuite(CyclicBarrierTest.class);
28	>	return new TestSuite(CyclicBarrierTest.class);
29		}
30
31	<	private volatile int countAction;
32	<	private class MyAction implements Runnable {
33	<	public void run() { ++countAction; }
31	>	/**
32	>	* Spin-waits till the number of waiters == numberOfWaiters.
33	>	*/
34	>	void awaitNumberWaiting(CyclicBarrier barrier, int numberOfWaiters) {
35	>	long startTime = System.nanoTime();
36	>	while (barrier.getNumberWaiting() != numberOfWaiters) {
37	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
38	>	fail("timed out");
39	>	Thread.yield();
40	>	}
41		}
42	<
42	>
43		/**
44	<	* Creating with negative parties throws IAE
44	>	* Creating with negative parties throws IllegalArgumentException
45		*/
46		public void testConstructor1() {
47		try {
48		new CyclicBarrier(-1, (Runnable)null);
49		shouldThrow();
50	<	} catch(IllegalArgumentException e){}
50	>	} catch (IllegalArgumentException success) {}
51		}
52
53		/**
54	<	* Creating with negative parties and no action throws IAE
54	>	* Creating with negative parties and no action throws
55	>	* IllegalArgumentException
56		*/
57		public void testConstructor2() {
58		try {
59		new CyclicBarrier(-1);
60		shouldThrow();
61	<	} catch(IllegalArgumentException e){}
61	>	} catch (IllegalArgumentException success) {}
62		}
63
64		/**
#	Line 47 | Line 66 | public class CyclicBarrierTest extends J
66		*/
67		public void testGetParties() {
68		CyclicBarrier b = new CyclicBarrier(2);
69	<	assertEquals(2, b.getParties());
69	>	assertEquals(2, b.getParties());
70		assertEquals(0, b.getNumberWaiting());
71		}
72
73		/**
74		* A 1-party barrier triggers after single await
75		*/
76	<	public void testSingleParty() {
77	<	try {
78	<	CyclicBarrier b = new CyclicBarrier(1);
79	<	assertEquals(1, b.getParties());
80	<	assertEquals(0, b.getNumberWaiting());
81	<	b.await();
82	<	b.await();
64	<	assertEquals(0, b.getNumberWaiting());
65	<	}
66	<	catch(Exception e) {
67	<	unexpectedException();
68	<	}
76	>	public void testSingleParty() throws Exception {
77	>	CyclicBarrier b = new CyclicBarrier(1);
78	>	assertEquals(1, b.getParties());
79	>	assertEquals(0, b.getNumberWaiting());
80	>	b.await();
81	>	b.await();
82	>	assertEquals(0, b.getNumberWaiting());
83		}
84	<
84	>
85		/**
86		* The supplied barrier action is run at barrier
87		*/
88	<	public void testBarrierAction() {
89	<	try {
90	<	countAction = 0;
91	<	CyclicBarrier b = new CyclicBarrier(1, new MyAction());
92	<	assertEquals(1, b.getParties());
93	<	assertEquals(0, b.getNumberWaiting());
94	<	b.await();
95	<	b.await();
96	<	assertEquals(0, b.getNumberWaiting());
97	<	assertEquals(countAction, 2);
98	<	}
85	<	catch(Exception e) {
86	<	unexpectedException();
87	<	}
88	>	public void testBarrierAction() throws Exception {
89	>	final AtomicInteger count = new AtomicInteger(0);
90	>	final Runnable incCount = new Runnable() { public void run() {
91	>	count.getAndIncrement(); }};
92	>	CyclicBarrier b = new CyclicBarrier(1, incCount);
93	>	assertEquals(1, b.getParties());
94	>	assertEquals(0, b.getNumberWaiting());
95	>	b.await();
96	>	b.await();
97	>	assertEquals(0, b.getNumberWaiting());
98	>	assertEquals(2, count.get());
99		}
100
101		/**
102		* A 2-party/thread barrier triggers after both threads invoke await
103		*/
104	<	public void testTwoParties() {
104	>	public void testTwoParties() throws Exception {
105		final CyclicBarrier b = new CyclicBarrier(2);
106	<	Thread t = new Thread(new Runnable() {
107	<	public void run() {
108	<	try {
109	<	b.await();
110	<	b.await();
111	<	b.await();
112	<	b.await();
113	<	} catch(Exception e){
114	<	threadUnexpectedException();
115	<	}}});
116	<
117	<	try {
118	<	t.start();
108	<	b.await();
109	<	b.await();
110	<	b.await();
111	<	b.await();
112	<	t.join();
113	<	} catch(Exception e){
114	<	unexpectedException();
115	<	}
106	>	Thread t = newStartedThread(new CheckedRunnable() {
107	>	public void realRun() throws Exception {
108	>	b.await();
109	>	b.await();
110	>	b.await();
111	>	b.await();
112	>	}});
113	>
114	>	b.await();
115	>	b.await();
116	>	b.await();
117	>	b.await();
118	>	awaitTermination(t);
119		}
120
118	–
121		/**
122		* An interruption in one party causes others waiting in await to
123		* throw BrokenBarrierException
124		*/
125		public void testAwait1_Interrupted_BrokenBarrier() {
126		final CyclicBarrier c = new CyclicBarrier(3);
127	<	Thread t1 = new Thread(new Runnable() {
128	<	public void run() {
129	<	try {
130	<	c.await();
131	<	threadShouldThrow();
132	<	} catch(InterruptedException success){}
133	<	catch(Exception b){
134	<	threadUnexpectedException();
135	<	}
136	<	}
137	<	});
138	<	Thread t2 = new Thread(new Runnable() {
139	<	public void run() {
140	<	try {
141	<	c.await();
142	<	threadShouldThrow();
143	<	} catch(BrokenBarrierException success){
144	<	} 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	<	}
127	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(2);
128	>	Thread t1 = new ThreadShouldThrow(InterruptedException.class) {
129	>	public void realRun() throws Exception {
130	>	pleaseInterrupt.countDown();
131	>	c.await();
132	>	}};
133	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
134	>	public void realRun() throws Exception {
135	>	pleaseInterrupt.countDown();
136	>	c.await();
137	>	}};
138	>
139	>	t1.start();
140	>	t2.start();
141	>	await(pleaseInterrupt);
142	>	t1.interrupt();
143	>	awaitTermination(t1);
144	>	awaitTermination(t2);
145		}
146
147		/**
148		* An interruption in one party causes others waiting in timed await to
149		* throw BrokenBarrierException
150		*/
151	<	public void testAwait2_Interrupted_BrokenBarrier() {
152	<	final CyclicBarrier c = new CyclicBarrier(3);
153	<	Thread t1 = new Thread(new Runnable() {
154	<	public void run() {
155	<	try {
156	<	c.await(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
157	<	threadShouldThrow();
158	<	} catch(InterruptedException success){
159	<	} catch(Exception b){
160	<	threadUnexpectedException();
161	<	}
162	<	}
163	<	});
164	<	Thread t2 = new Thread(new Runnable() {
165	<	public void run() {
166	<	try {
167	<	c.await(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
168	<	threadShouldThrow();
169	<	} catch(BrokenBarrierException success){
170	<	} 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	<	}
151	>	public void testAwait2_Interrupted_BrokenBarrier() throws Exception {
152	>	final CyclicBarrier c = new CyclicBarrier(3);
153	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(2);
154	>	Thread t1 = new ThreadShouldThrow(InterruptedException.class) {
155	>	public void realRun() throws Exception {
156	>	pleaseInterrupt.countDown();
157	>	c.await(LONG_DELAY_MS, MILLISECONDS);
158	>	}};
159	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
160	>	public void realRun() throws Exception {
161	>	pleaseInterrupt.countDown();
162	>	c.await(LONG_DELAY_MS, MILLISECONDS);
163	>	}};
164	>
165	>	t1.start();
166	>	t2.start();
167	>	await(pleaseInterrupt);
168	>	t1.interrupt();
169	>	awaitTermination(t1);
170	>	awaitTermination(t2);
171		}
172	<
172	>
173		/**
174		* A timeout in timed await throws TimeoutException
175		*/
176	<	public void testAwait3_TimeOutException() {
176	>	public void testAwait3_TimeoutException() throws InterruptedException {
177		final CyclicBarrier c = new CyclicBarrier(2);
178	<	Thread t = new Thread(new Runnable() {
179	<	public void run() {
180	<	try {
181	<	c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
182	<	threadShouldThrow();
183	<	} catch(TimeoutException success){
184	<	} catch(Exception b){
185	<	threadUnexpectedException();
186	<
187	<	}
188	<	}
215	<	});
216	<	try {
217	<	t.start();
218	<	t.join();
219	<	} catch(InterruptedException e){
220	<	unexpectedException();
221	<	}
178	>	Thread t = newStartedThread(new CheckedRunnable() {
179	>	public void realRun() throws Exception {
180	>	long startTime = System.nanoTime();
181	>	try {
182	>	c.await(timeoutMillis(), MILLISECONDS);
183	>	shouldThrow();
184	>	} catch (TimeoutException success) {}
185	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
186	>	}});
187	>
188	>	awaitTermination(t);
189		}
190
191		/**
192		* A timeout in one party causes others waiting in timed await to
193		* throw BrokenBarrierException
194		*/
195	<	public void testAwait4_Timeout_BrokenBarrier() {
196	<	final CyclicBarrier c = new CyclicBarrier(3);
197	<	Thread t1 = new Thread(new Runnable() {
198	<	public void run() {
199	<	try {
200	<	c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
201	<	threadShouldThrow();
202	<	} catch(TimeoutException success){
203	<	} catch(Exception b){
204	<	threadUnexpectedException();
205	<	}
206	<	}
207	<	});
208	<	Thread t2 = new Thread(new Runnable() {
209	<	public void run() {
210	<	try {
211	<	c.await(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
212	<	threadShouldThrow();
213	<	} catch(BrokenBarrierException success){
214	<	} catch(Exception i){
215	<	threadUnexpectedException();
216	<	}
250	<	}
251	<	});
252	<	try {
253	<	t1.start();
254	<	t2.start();
255	<	t1.join();
256	<	t2.join();
257	<	} catch(InterruptedException e){
258	<	unexpectedException();
259	<	}
195	>	public void testAwait4_Timeout_BrokenBarrier() throws InterruptedException {
196	>	final CyclicBarrier c = new CyclicBarrier(3);
197	>	Thread t1 = newStartedThread(new CheckedRunnable() {
198	>	public void realRun() throws Exception {
199	>	try {
200	>	c.await(LONG_DELAY_MS, MILLISECONDS);
201	>	shouldThrow();
202	>	} catch (BrokenBarrierException success) {}
203	>	}});
204	>	Thread t2 = newStartedThread(new CheckedRunnable() {
205	>	public void realRun() throws Exception {
206	>	awaitNumberWaiting(c, 1);
207	>	long startTime = System.nanoTime();
208	>	try {
209	>	c.await(timeoutMillis(), MILLISECONDS);
210	>	shouldThrow();
211	>	} catch (TimeoutException success) {}
212	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
213	>	}});
214	>
215	>	awaitTermination(t1);
216	>	awaitTermination(t2);
217		}
218
219		/**
220		* A timeout in one party causes others waiting in await to
221		* throw BrokenBarrierException
222		*/
223	<	public void testAwait5_Timeout_BrokenBarrier() {
224	<	final CyclicBarrier c = new CyclicBarrier(3);
225	<	Thread t1 = new Thread(new Runnable() {
226	<	public void run() {
227	<	try {
228	<	c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
229	<	threadShouldThrow();
230	<	} catch(TimeoutException success){
231	<	} catch(Exception b){
232	<	threadUnexpectedException();
233	<	}
234	<	}
235	<	});
236	<	Thread t2 = new Thread(new Runnable() {
237	<	public void run() {
238	<	try {
239	<	c.await();
240	<	threadShouldThrow();
241	<	} catch(BrokenBarrierException success){
242	<	} catch(Exception i){
243	<	threadUnexpectedException();
244	<	}
288	<	}
289	<	});
290	<	try {
291	<	t1.start();
292	<	t2.start();
293	<	t1.join();
294	<	t2.join();
295	<	} catch(InterruptedException e){
296	<	unexpectedException();
297	<	}
223	>	public void testAwait5_Timeout_BrokenBarrier() throws InterruptedException {
224	>	final CyclicBarrier c = new CyclicBarrier(3);
225	>	Thread t1 = newStartedThread(new CheckedRunnable() {
226	>	public void realRun() throws Exception {
227	>	try {
228	>	c.await();
229	>	shouldThrow();
230	>	} catch (BrokenBarrierException success) {}
231	>	}});
232	>	Thread t2 = newStartedThread(new CheckedRunnable() {
233	>	public void realRun() throws Exception {
234	>	awaitNumberWaiting(c, 1);
235	>	long startTime = System.nanoTime();
236	>	try {
237	>	c.await(timeoutMillis(), MILLISECONDS);
238	>	shouldThrow();
239	>	} catch (TimeoutException success) {}
240	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
241	>	}});
242	>
243	>	awaitTermination(t1);
244	>	awaitTermination(t2);
245		}
246	<
246	>
247		/**
248		* A reset of an active barrier causes waiting threads to throw
249		* BrokenBarrierException
250		*/
251	<	public void testReset_BrokenBarrier() {
251	>	public void testReset_BrokenBarrier() throws InterruptedException {
252		final CyclicBarrier c = new CyclicBarrier(3);
253	<	Thread t1 = new Thread(new Runnable() {
254	<	public void run() {
255	<	try {
256	<	c.await();
257	<	threadShouldThrow();
258	<	} catch(BrokenBarrierException success){}
259	<	catch(Exception b){
260	<	threadUnexpectedException();
261	<	}
262	<	}
263	<	});
264	<	Thread t2 = new Thread(new Runnable() {
265	<	public void run() {
266	<	try {
267	<	c.await();
268	<	threadShouldThrow();
269	<	} catch(BrokenBarrierException success){
270	<	} catch(Exception i){
271	<	threadUnexpectedException();
272	<	}
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	<	}
253	>	final CountDownLatch pleaseReset = new CountDownLatch(2);
254	>	Thread t1 = new ThreadShouldThrow(BrokenBarrierException.class) {
255	>	public void realRun() throws Exception {
256	>	pleaseReset.countDown();
257	>	c.await();
258	>	}};
259	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
260	>	public void realRun() throws Exception {
261	>	pleaseReset.countDown();
262	>	c.await();
263	>	}};
264	>
265	>	t1.start();
266	>	t2.start();
267	>	await(pleaseReset);
268	>
269	>	awaitNumberWaiting(c, 2);
270	>	c.reset();
271	>	awaitTermination(t1);
272	>	awaitTermination(t2);
273		}
274
275		/**
276		* A reset before threads enter barrier does not throw
277		* BrokenBarrierException
278		*/
279	<	public void testReset_NoBrokenBarrier() {
279	>	public void testReset_NoBrokenBarrier() throws Exception {
280		final CyclicBarrier c = new CyclicBarrier(3);
281	<	Thread t1 = new Thread(new Runnable() {
282	<	public void run() {
283	<	try {
284	<	c.await();
285	<	} catch(Exception b){
286	<	threadUnexpectedException();
287	<	}
288	<	}
289	<	});
290	<	Thread t2 = new Thread(new Runnable() {
291	<	public void run() {
292	<	try {
293	<	c.await();
294	<	} catch(Exception i){
295	<	threadUnexpectedException();
296	<	}
297	<	}
298	<	});
299	<	try {
300	<	c.reset();
281	>	c.reset();
282	>
283	>	Thread t1 = newStartedThread(new CheckedRunnable() {
284	>	public void realRun() throws Exception {
285	>	c.await();
286	>	}});
287	>	Thread t2 = newStartedThread(new CheckedRunnable() {
288	>	public void realRun() throws Exception {
289	>	c.await();
290	>	}});
291	>
292	>	c.await();
293	>	awaitTermination(t1);
294	>	awaitTermination(t2);
295	>	}
296	>
297	>	/**
298	>	* Reset of a non-broken barrier does not break barrier
299	>	*/
300	>	public void testResetWithoutBreakage() throws Exception {
301	>	final CyclicBarrier barrier = new CyclicBarrier(3);
302	>	for (int i = 0; i < 3; i++) {
303	>	final CyclicBarrier start = new CyclicBarrier(3);
304	>	Thread t1 = newStartedThread(new CheckedRunnable() {
305	>	public void realRun() throws Exception {
306	>	start.await();
307	>	barrier.await();
308	>	}});
309	>
310	>	Thread t2 = newStartedThread(new CheckedRunnable() {
311	>	public void realRun() throws Exception {
312	>	start.await();
313	>	barrier.await();
314	>	}});
315	>
316	>	start.await();
317	>	barrier.await();
318	>	awaitTermination(t1);
319	>	awaitTermination(t2);
320	>	assertFalse(barrier.isBroken());
321	>	assertEquals(0, barrier.getNumberWaiting());
322	>	if (i == 1) barrier.reset();
323	>	assertFalse(barrier.isBroken());
324	>	assertEquals(0, barrier.getNumberWaiting());
325	>	}
326	>	}
327	>
328	>	/**
329	>	* Reset of a barrier after interruption reinitializes it.
330	>	*/
331	>	public void testResetAfterInterrupt() throws Exception {
332	>	final CyclicBarrier barrier = new CyclicBarrier(3);
333	>	for (int i = 0; i < 2; i++) {
334	>	final CyclicBarrier start = new CyclicBarrier(3);
335	>	Thread t1 = new ThreadShouldThrow(InterruptedException.class) {
336	>	public void realRun() throws Exception {
337	>	start.await();
338	>	barrier.await();
339	>	}};
340	>
341	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
342	>	public void realRun() throws Exception {
343	>	start.await();
344	>	barrier.await();
345	>	}};
346	>
347		t1.start();
348		t2.start();
349	<	c.await();
350	<	t1.join();
351	<	t2.join();
352	<	} catch(Exception e){
353	<	unexpectedException();
349	>	start.await();
350	>	t1.interrupt();
351	>	awaitTermination(t1);
352	>	awaitTermination(t2);
353	>	assertTrue(barrier.isBroken());
354	>	assertEquals(0, barrier.getNumberWaiting());
355	>	barrier.reset();
356	>	assertFalse(barrier.isBroken());
357	>	assertEquals(0, barrier.getNumberWaiting());
358	>	}
359	>	}
360	>
361	>	/**
362	>	* Reset of a barrier after timeout reinitializes it.
363	>	*/
364	>	public void testResetAfterTimeout() throws Exception {
365	>	final CyclicBarrier barrier = new CyclicBarrier(3);
366	>	for (int i = 0; i < 2; i++) {
367	>	assertEquals(0, barrier.getNumberWaiting());
368	>	Thread t1 = newStartedThread(new CheckedRunnable() {
369	>	public void realRun() throws Exception {
370	>	try {
371	>	barrier.await();
372	>	shouldThrow();
373	>	} catch (BrokenBarrierException success) {}
374	>	}});
375	>	Thread t2 = newStartedThread(new CheckedRunnable() {
376	>	public void realRun() throws Exception {
377	>	awaitNumberWaiting(barrier, 1);
378	>	long startTime = System.nanoTime();
379	>	try {
380	>	barrier.await(timeoutMillis(), MILLISECONDS);
381	>	shouldThrow();
382	>	} catch (TimeoutException success) {}
383	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
384	>	}});
385	>
386	>	awaitTermination(t1);
387	>	awaitTermination(t2);
388	>	assertEquals(0, barrier.getNumberWaiting());
389	>	assertTrue(barrier.isBroken());
390	>	assertEquals(0, barrier.getNumberWaiting());
391	>	barrier.reset();
392	>	assertFalse(barrier.isBroken());
393	>	assertEquals(0, barrier.getNumberWaiting());
394	>	}
395	>	}
396	>
397	>	/**
398	>	* Reset of a barrier after a failed command reinitializes it.
399	>	*/
400	>	public void testResetAfterCommandException() throws Exception {
401	>	final CyclicBarrier barrier =
402	>	new CyclicBarrier(3, new Runnable() {
403	>	public void run() {
404	>	throw new NullPointerException(); }});
405	>	for (int i = 0; i < 2; i++) {
406	>	final CyclicBarrier start = new CyclicBarrier(3);
407	>	Thread t1 = new ThreadShouldThrow(BrokenBarrierException.class) {
408	>	public void realRun() throws Exception {
409	>	start.await();
410	>	barrier.await();
411	>	}};
412	>
413	>	Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) {
414	>	public void realRun() throws Exception {
415	>	start.await();
416	>	barrier.await();
417	>	}};
418	>
419	>	t1.start();
420	>	t2.start();
421	>	start.await();
422	>	awaitNumberWaiting(barrier, 2);
423	>	try {
424	>	barrier.await();
425	>	shouldThrow();
426	>	} catch (NullPointerException success) {}
427	>	awaitTermination(t1);
428	>	awaitTermination(t2);
429	>	assertTrue(barrier.isBroken());
430	>	assertEquals(0, barrier.getNumberWaiting());
431	>	barrier.reset();
432	>	assertFalse(barrier.isBroken());
433	>	assertEquals(0, barrier.getNumberWaiting());
434		}
435		}
436
437	+	/**
438	+	* There can be more threads calling await() than parties, as long as each
439	+	* task only calls await once and the task count is a multiple of parties.
440	+	*/
441	+	public void testMoreTasksThanParties() throws Exception {
442	+	final ThreadLocalRandom rnd = ThreadLocalRandom.current();
443	+	final int parties = rnd.nextInt(1, 5);
444	+	final int nTasks = rnd.nextInt(1, 5) * parties;
445	+	final AtomicInteger tripCount = new AtomicInteger(0);
446	+	final AtomicInteger awaitCount = new AtomicInteger(0);
447	+	final CyclicBarrier barrier =
448	+	new CyclicBarrier(parties, () -> tripCount.getAndIncrement());
449	+	final ExecutorService e = Executors.newFixedThreadPool(nTasks);
450	+	final Runnable awaiter = () -> {
451	+	try {
452	+	if (randomBoolean())
453	+	barrier.await();
454	+	else
455	+	barrier.await(LONG_DELAY_MS, MILLISECONDS);
456	+	awaitCount.getAndIncrement();
457	+	} catch (Throwable fail) { threadUnexpectedException(fail); }};
458	+	try (PoolCleaner cleaner = cleaner(e)) {
459	+	for (int i = nTasks; i--> 0; )
460	+	e.execute(awaiter);
461	+	}
462	+	assertEquals(nTasks / parties, tripCount.get());
463	+	assertEquals(nTasks, awaitCount.get());
464	+	assertEquals(0, barrier.getNumberWaiting());
465	+	}
466		}

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