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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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*/ |
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import junit.framework.*; |
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import java.util.*; |
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import java.util.concurrent.*; |
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import java.util.concurrent.locks.*; |
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import java.util.concurrent.atomic.*; |
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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|
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import java.util.concurrent.BrokenBarrierException; |
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import java.util.concurrent.CountDownLatch; |
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import java.util.concurrent.CyclicBarrier; |
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import java.util.concurrent.TimeoutException; |
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import java.util.concurrent.atomic.AtomicBoolean; |
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import java.util.concurrent.atomic.AtomicInteger; |
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|
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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|
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public class CyclicBarrierTest extends JSR166TestCase { |
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public static void main(String[] args) { |
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junit.textui.TestRunner.run(suite()); |
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main(suite(), args); |
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} |
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public static Test suite() { |
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return new TestSuite(CyclicBarrierTest.class); |
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} |
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|
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private volatile int countAction; |
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private class MyAction implements Runnable { |
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public void run() { ++countAction; } |
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/** |
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* Spin-waits till the number of waiters == numberOfWaiters. |
31 |
> |
*/ |
32 |
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void awaitNumberWaiting(CyclicBarrier barrier, int numberOfWaiters) { |
33 |
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long startTime = System.nanoTime(); |
34 |
> |
while (barrier.getNumberWaiting() != numberOfWaiters) { |
35 |
> |
if (millisElapsedSince(startTime) > LONG_DELAY_MS) |
36 |
> |
fail("timed out"); |
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Thread.yield(); |
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> |
} |
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} |
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|
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/** |
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* The supplied barrier action is run at barrier |
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*/ |
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public void testBarrierAction() throws Exception { |
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countAction = 0; |
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CyclicBarrier b = new CyclicBarrier(1, new MyAction()); |
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final AtomicInteger count = new AtomicInteger(0); |
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final Runnable incCount = new Runnable() { public void run() { |
88 |
> |
count.getAndIncrement(); }}; |
89 |
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CyclicBarrier b = new CyclicBarrier(1, incCount); |
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assertEquals(1, b.getParties()); |
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assertEquals(0, b.getNumberWaiting()); |
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b.await(); |
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b.await(); |
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assertEquals(0, b.getNumberWaiting()); |
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assertEquals(countAction, 2); |
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assertEquals(2, count.get()); |
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} |
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|
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/** |
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*/ |
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public void testTwoParties() throws Exception { |
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final CyclicBarrier b = new CyclicBarrier(2); |
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Thread t = new Thread(new CheckedRunnable() { |
103 |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() throws Exception { |
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b.await(); |
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b.await(); |
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b.await(); |
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}}); |
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|
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t.start(); |
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b.await(); |
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b.await(); |
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b.await(); |
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b.await(); |
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t.join(); |
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awaitTermination(t); |
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} |
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|
105 |
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|
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/** |
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* An interruption in one party causes others waiting in await to |
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* throw BrokenBarrierException |
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*/ |
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public void testAwait1_Interrupted_BrokenBarrier() throws Exception { |
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public void testAwait1_Interrupted_BrokenBarrier() { |
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final CyclicBarrier c = new CyclicBarrier(3); |
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final CountDownLatch pleaseInterrupt = new CountDownLatch(2); |
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Thread t1 = new ThreadShouldThrow(InterruptedException.class) { |
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public void realRun() throws Exception { |
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pleaseInterrupt.countDown(); |
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c.await(); |
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}}; |
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Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) { |
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public void realRun() throws Exception { |
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pleaseInterrupt.countDown(); |
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c.await(); |
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}}; |
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|
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t1.start(); |
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t2.start(); |
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Thread.sleep(SHORT_DELAY_MS); |
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await(pleaseInterrupt); |
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t1.interrupt(); |
140 |
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t1.join(); |
141 |
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t2.join(); |
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> |
awaitTermination(t1); |
141 |
> |
awaitTermination(t2); |
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} |
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|
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/** |
147 |
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*/ |
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public void testAwait2_Interrupted_BrokenBarrier() throws Exception { |
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final CyclicBarrier c = new CyclicBarrier(3); |
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final CountDownLatch pleaseInterrupt = new CountDownLatch(2); |
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Thread t1 = new ThreadShouldThrow(InterruptedException.class) { |
152 |
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public void realRun() throws Exception { |
153 |
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pleaseInterrupt.countDown(); |
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c.await(LONG_DELAY_MS, MILLISECONDS); |
155 |
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}}; |
156 |
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Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) { |
157 |
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public void realRun() throws Exception { |
158 |
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pleaseInterrupt.countDown(); |
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c.await(LONG_DELAY_MS, MILLISECONDS); |
160 |
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}}; |
161 |
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|
162 |
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t1.start(); |
163 |
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t2.start(); |
164 |
< |
Thread.sleep(SHORT_DELAY_MS); |
164 |
> |
await(pleaseInterrupt); |
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t1.interrupt(); |
166 |
< |
t1.join(); |
167 |
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t2.join(); |
166 |
> |
awaitTermination(t1); |
167 |
> |
awaitTermination(t2); |
168 |
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} |
169 |
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|
170 |
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/** |
171 |
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* A timeout in timed await throws TimeoutException |
172 |
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*/ |
173 |
< |
public void testAwait3_TimeOutException() throws InterruptedException { |
173 |
> |
public void testAwait3_TimeoutException() throws InterruptedException { |
174 |
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final CyclicBarrier c = new CyclicBarrier(2); |
175 |
< |
Thread t = new ThreadShouldThrow(TimeoutException.class) { |
175 |
> |
Thread t = newStartedThread(new CheckedRunnable() { |
176 |
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public void realRun() throws Exception { |
177 |
< |
c.await(SHORT_DELAY_MS, MILLISECONDS); |
178 |
< |
}}; |
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 |
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|
185 |
< |
t.start(); |
163 |
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t.join(); |
185 |
> |
awaitTermination(t); |
186 |
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} |
187 |
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|
188 |
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/** |
191 |
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*/ |
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public void testAwait4_Timeout_BrokenBarrier() throws InterruptedException { |
193 |
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final CyclicBarrier c = new CyclicBarrier(3); |
194 |
< |
Thread t1 = new ThreadShouldThrow(TimeoutException.class) { |
194 |
> |
Thread t1 = newStartedThread(new CheckedRunnable() { |
195 |
|
public void realRun() throws Exception { |
196 |
< |
c.await(SHORT_DELAY_MS, MILLISECONDS); |
197 |
< |
}}; |
198 |
< |
Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) { |
196 |
> |
try { |
197 |
> |
c.await(LONG_DELAY_MS, MILLISECONDS); |
198 |
> |
shouldThrow(); |
199 |
> |
} catch (BrokenBarrierException success) {} |
200 |
> |
}}); |
201 |
> |
Thread t2 = newStartedThread(new CheckedRunnable() { |
202 |
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public void realRun() throws Exception { |
203 |
< |
c.await(MEDIUM_DELAY_MS, MILLISECONDS); |
204 |
< |
}}; |
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 |
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|
212 |
< |
t1.start(); |
213 |
< |
t2.start(); |
183 |
< |
t1.join(); |
184 |
< |
t2.join(); |
212 |
> |
awaitTermination(t1); |
213 |
> |
awaitTermination(t2); |
214 |
|
} |
215 |
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|
216 |
|
/** |
219 |
|
*/ |
220 |
|
public void testAwait5_Timeout_BrokenBarrier() throws InterruptedException { |
221 |
|
final CyclicBarrier c = new CyclicBarrier(3); |
222 |
< |
Thread t1 = new ThreadShouldThrow(TimeoutException.class) { |
222 |
> |
Thread t1 = newStartedThread(new CheckedRunnable() { |
223 |
|
public void realRun() throws Exception { |
224 |
< |
c.await(SHORT_DELAY_MS, MILLISECONDS); |
225 |
< |
}}; |
226 |
< |
Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) { |
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 |
< |
c.await(); |
232 |
< |
}}; |
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 |
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|
240 |
< |
t1.start(); |
241 |
< |
t2.start(); |
204 |
< |
t1.join(); |
205 |
< |
t2.join(); |
240 |
> |
awaitTermination(t1); |
241 |
> |
awaitTermination(t2); |
242 |
|
} |
243 |
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|
244 |
|
/** |
247 |
|
*/ |
248 |
|
public void testReset_BrokenBarrier() throws InterruptedException { |
249 |
|
final CyclicBarrier c = new CyclicBarrier(3); |
250 |
+ |
final CountDownLatch pleaseReset = new CountDownLatch(2); |
251 |
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Thread t1 = new ThreadShouldThrow(BrokenBarrierException.class) { |
252 |
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public void realRun() throws Exception { |
253 |
+ |
pleaseReset.countDown(); |
254 |
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c.await(); |
255 |
|
}}; |
256 |
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Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) { |
257 |
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public void realRun() throws Exception { |
258 |
+ |
pleaseReset.countDown(); |
259 |
|
c.await(); |
260 |
|
}}; |
261 |
|
|
262 |
|
t1.start(); |
263 |
|
t2.start(); |
264 |
< |
Thread.sleep(SHORT_DELAY_MS); |
264 |
> |
await(pleaseReset); |
265 |
> |
|
266 |
> |
awaitNumberWaiting(c, 2); |
267 |
|
c.reset(); |
268 |
< |
t1.join(); |
269 |
< |
t2.join(); |
268 |
> |
awaitTermination(t1); |
269 |
> |
awaitTermination(t2); |
270 |
|
} |
271 |
|
|
272 |
|
/** |
275 |
|
*/ |
276 |
|
public void testReset_NoBrokenBarrier() throws Exception { |
277 |
|
final CyclicBarrier c = new CyclicBarrier(3); |
278 |
< |
Thread t1 = new Thread(new CheckedRunnable() { |
278 |
> |
c.reset(); |
279 |
> |
|
280 |
> |
Thread t1 = newStartedThread(new CheckedRunnable() { |
281 |
|
public void realRun() throws Exception { |
282 |
|
c.await(); |
283 |
|
}}); |
284 |
< |
Thread t2 = new Thread(new CheckedRunnable() { |
284 |
> |
Thread t2 = newStartedThread(new CheckedRunnable() { |
285 |
|
public void realRun() throws Exception { |
286 |
|
c.await(); |
287 |
|
}}); |
288 |
|
|
246 |
– |
c.reset(); |
247 |
– |
t1.start(); |
248 |
– |
t2.start(); |
289 |
|
c.await(); |
290 |
< |
t1.join(); |
291 |
< |
t2.join(); |
290 |
> |
awaitTermination(t1); |
291 |
> |
awaitTermination(t2); |
292 |
|
} |
293 |
|
|
294 |
|
/** |
297 |
|
public void testReset_Leakage() throws InterruptedException { |
298 |
|
final CyclicBarrier c = new CyclicBarrier(2); |
299 |
|
final AtomicBoolean done = new AtomicBoolean(); |
300 |
< |
Thread t = new Thread() { |
301 |
< |
public void run() { |
302 |
< |
while (!done.get()) { |
303 |
< |
try { |
304 |
< |
while (c.isBroken()) |
305 |
< |
c.reset(); |
306 |
< |
|
307 |
< |
c.await(); |
308 |
< |
threadFail("await should not return"); |
269 |
< |
} |
270 |
< |
catch (BrokenBarrierException e) { |
271 |
< |
} |
272 |
< |
catch (InterruptedException ie) { |
273 |
< |
} |
300 |
> |
Thread t = newStartedThread(new CheckedRunnable() { |
301 |
> |
public void realRun() { |
302 |
> |
while (!done.get()) { |
303 |
> |
try { |
304 |
> |
while (c.isBroken()) |
305 |
> |
c.reset(); |
306 |
> |
|
307 |
> |
c.await(); |
308 |
> |
shouldThrow(); |
309 |
|
} |
310 |
< |
} |
311 |
< |
}; |
310 |
> |
catch (BrokenBarrierException ok) {} |
311 |
> |
catch (InterruptedException ok) {} |
312 |
> |
}}}); |
313 |
|
|
278 |
– |
t.start(); |
314 |
|
for (int i = 0; i < 4; i++) { |
315 |
< |
Thread.sleep(SHORT_DELAY_MS); |
315 |
> |
delay(timeoutMillis()); |
316 |
|
t.interrupt(); |
317 |
|
} |
318 |
|
done.set(true); |
319 |
|
t.interrupt(); |
320 |
< |
t.join(); |
320 |
> |
awaitTermination(t); |
321 |
|
} |
322 |
|
|
323 |
|
/** |
324 |
|
* Reset of a non-broken barrier does not break barrier |
325 |
|
*/ |
326 |
|
public void testResetWithoutBreakage() throws Exception { |
292 |
– |
final CyclicBarrier start = new CyclicBarrier(3); |
327 |
|
final CyclicBarrier barrier = new CyclicBarrier(3); |
328 |
|
for (int i = 0; i < 3; i++) { |
329 |
< |
Thread t1 = new Thread(new CheckedRunnable() { |
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 = new Thread(new CheckedRunnable() { |
336 |
> |
Thread t2 = newStartedThread(new CheckedRunnable() { |
337 |
|
public void realRun() throws Exception { |
338 |
|
start.await(); |
339 |
|
barrier.await(); |
340 |
|
}}); |
341 |
|
|
307 |
– |
t1.start(); |
308 |
– |
t2.start(); |
342 |
|
start.await(); |
343 |
|
barrier.await(); |
344 |
< |
t1.join(); |
345 |
< |
t2.join(); |
344 |
> |
awaitTermination(t1); |
345 |
> |
awaitTermination(t2); |
346 |
|
assertFalse(barrier.isBroken()); |
347 |
|
assertEquals(0, barrier.getNumberWaiting()); |
348 |
|
if (i == 1) barrier.reset(); |
355 |
|
* Reset of a barrier after interruption reinitializes it. |
356 |
|
*/ |
357 |
|
public void testResetAfterInterrupt() throws Exception { |
325 |
– |
final CyclicBarrier start = new CyclicBarrier(3); |
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(); |
374 |
|
t2.start(); |
375 |
|
start.await(); |
376 |
|
t1.interrupt(); |
377 |
< |
t1.join(); |
378 |
< |
t2.join(); |
377 |
> |
awaitTermination(t1); |
378 |
> |
awaitTermination(t2); |
379 |
|
assertTrue(barrier.isBroken()); |
380 |
|
assertEquals(0, barrier.getNumberWaiting()); |
381 |
|
barrier.reset(); |
388 |
|
* Reset of a barrier after timeout reinitializes it. |
389 |
|
*/ |
390 |
|
public void testResetAfterTimeout() throws Exception { |
358 |
– |
final CyclicBarrier start = new CyclicBarrier(3); |
391 |
|
final CyclicBarrier barrier = new CyclicBarrier(3); |
392 |
|
for (int i = 0; i < 2; i++) { |
393 |
< |
Thread t1 = new ThreadShouldThrow(TimeoutException.class) { |
394 |
< |
public void realRun() throws Exception { |
363 |
< |
start.await(); |
364 |
< |
barrier.await(MEDIUM_DELAY_MS, MILLISECONDS); |
365 |
< |
}}; |
366 |
< |
|
367 |
< |
Thread t2 = new ThreadShouldThrow(BrokenBarrierException.class) { |
393 |
> |
assertEquals(0, barrier.getNumberWaiting()); |
394 |
> |
Thread t1 = newStartedThread(new CheckedRunnable() { |
395 |
|
public void realRun() throws Exception { |
396 |
< |
start.await(); |
397 |
< |
barrier.await(); |
398 |
< |
}}; |
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 |
< |
t1.start(); |
413 |
< |
t2.start(); |
414 |
< |
start.await(); |
376 |
< |
t1.join(); |
377 |
< |
t2.join(); |
412 |
> |
awaitTermination(t1); |
413 |
> |
awaitTermination(t2); |
414 |
> |
assertEquals(0, barrier.getNumberWaiting()); |
415 |
|
assertTrue(barrier.isBroken()); |
416 |
|
assertEquals(0, barrier.getNumberWaiting()); |
417 |
|
barrier.reset(); |
420 |
|
} |
421 |
|
} |
422 |
|
|
386 |
– |
|
423 |
|
/** |
424 |
|
* Reset of a barrier after a failed command reinitializes it. |
425 |
|
*/ |
426 |
|
public void testResetAfterCommandException() throws Exception { |
391 |
– |
final CyclicBarrier start = new CyclicBarrier(3); |
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(); |
445 |
|
t1.start(); |
446 |
|
t2.start(); |
447 |
|
start.await(); |
448 |
< |
while (barrier.getNumberWaiting() < 2) { Thread.yield(); } |
448 |
> |
awaitNumberWaiting(barrier, 2); |
449 |
|
try { |
450 |
|
barrier.await(); |
451 |
|
shouldThrow(); |
452 |
|
} catch (NullPointerException success) {} |
453 |
< |
t1.join(); |
454 |
< |
t2.join(); |
453 |
> |
awaitTermination(t1); |
454 |
> |
awaitTermination(t2); |
455 |
|
assertTrue(barrier.isBroken()); |
456 |
|
assertEquals(0, barrier.getNumberWaiting()); |
457 |
|
barrier.reset(); |