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dl |
1.1 |
/* |
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dl |
1.6 |
* 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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jsr166 |
1.16 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
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jsr166 |
1.8 |
* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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dl |
1.1 |
*/ |
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import junit.framework.*; |
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import java.util.*; |
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jsr166 |
1.21 |
import java.util.concurrent.CountDownLatch; |
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jsr166 |
1.12 |
import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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dl |
1.1 |
|
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dl |
1.2 |
public class CountDownLatchTest extends JSR166TestCase { |
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dl |
1.1 |
public static void main(String[] args) { |
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jsr166 |
1.14 |
junit.textui.TestRunner.run(suite()); |
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dl |
1.1 |
} |
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public static Test suite() { |
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jsr166 |
1.11 |
return new TestSuite(CountDownLatchTest.class); |
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dl |
1.1 |
} |
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dl |
1.3 |
/** |
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dl |
1.4 |
* negative constructor argument throws IAE |
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dl |
1.3 |
*/ |
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public void testConstructor() { |
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dl |
1.2 |
try { |
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new CountDownLatch(-1); |
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dl |
1.3 |
shouldThrow(); |
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jsr166 |
1.10 |
} catch (IllegalArgumentException success) {} |
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dl |
1.2 |
} |
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dl |
1.1 |
|
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dl |
1.3 |
/** |
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dl |
1.4 |
* getCount returns initial count and decreases after countDown |
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dl |
1.3 |
*/ |
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public void testGetCount() { |
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jsr166 |
1.11 |
final CountDownLatch l = new CountDownLatch(2); |
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assertEquals(2, l.getCount()); |
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l.countDown(); |
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assertEquals(1, l.getCount()); |
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dl |
1.1 |
} |
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dl |
1.3 |
/** |
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dl |
1.5 |
* countDown decrements count when positive and has no effect when zero |
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dl |
1.4 |
*/ |
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dl |
1.5 |
public void testCountDown() { |
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jsr166 |
1.11 |
final CountDownLatch l = new CountDownLatch(1); |
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assertEquals(1, l.getCount()); |
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l.countDown(); |
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assertEquals(0, l.getCount()); |
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l.countDown(); |
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assertEquals(0, l.getCount()); |
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dl |
1.4 |
} |
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/** |
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* await returns after countDown to zero, but not before |
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dl |
1.3 |
*/ |
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jsr166 |
1.20 |
public void testAwait() { |
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jsr166 |
1.11 |
final CountDownLatch l = new CountDownLatch(2); |
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jsr166 |
1.20 |
final CountDownLatch pleaseCountDown = new CountDownLatch(1); |
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dl |
1.1 |
|
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jsr166 |
1.20 |
Thread t = newStartedThread(new CheckedRunnable() { |
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jsr166 |
1.13 |
public void realRun() throws InterruptedException { |
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jsr166 |
1.20 |
assertEquals(2, l.getCount()); |
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pleaseCountDown.countDown(); |
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jsr166 |
1.13 |
l.await(); |
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jsr166 |
1.15 |
assertEquals(0, l.getCount()); |
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jsr166 |
1.13 |
}}); |
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jsr166 |
1.20 |
await(pleaseCountDown); |
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assertEquals(2, l.getCount()); |
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jsr166 |
1.13 |
l.countDown(); |
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jsr166 |
1.20 |
assertEquals(1, l.getCount()); |
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assertThreadStaysAlive(t); |
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jsr166 |
1.13 |
l.countDown(); |
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jsr166 |
1.20 |
assertEquals(0, l.getCount()); |
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awaitTermination(t); |
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dl |
1.1 |
} |
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jsr166 |
1.8 |
|
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dl |
1.3 |
/** |
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dl |
1.4 |
* timed await returns after countDown to zero |
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dl |
1.3 |
*/ |
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jsr166 |
1.20 |
public void testTimedAwait() { |
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jsr166 |
1.11 |
final CountDownLatch l = new CountDownLatch(2); |
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jsr166 |
1.20 |
final CountDownLatch pleaseCountDown = new CountDownLatch(1); |
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dl |
1.1 |
|
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jsr166 |
1.20 |
Thread t = newStartedThread(new CheckedRunnable() { |
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jsr166 |
1.13 |
public void realRun() throws InterruptedException { |
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jsr166 |
1.20 |
assertEquals(2, l.getCount()); |
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pleaseCountDown.countDown(); |
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assertTrue(l.await(LONG_DELAY_MS, MILLISECONDS)); |
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assertEquals(0, l.getCount()); |
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jsr166 |
1.13 |
}}); |
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jsr166 |
1.20 |
await(pleaseCountDown); |
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assertEquals(2, l.getCount()); |
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jsr166 |
1.13 |
l.countDown(); |
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jsr166 |
1.20 |
assertEquals(1, l.getCount()); |
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assertThreadStaysAlive(t); |
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jsr166 |
1.13 |
l.countDown(); |
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jsr166 |
1.20 |
assertEquals(0, l.getCount()); |
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awaitTermination(t); |
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dl |
1.1 |
} |
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jsr166 |
1.8 |
|
104 |
dl |
1.3 |
/** |
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dl |
1.5 |
* await throws IE if interrupted before counted down |
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dl |
1.3 |
*/ |
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jsr166 |
1.20 |
public void testAwait_Interruptible() { |
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dl |
1.1 |
final CountDownLatch l = new CountDownLatch(1); |
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jsr166 |
1.20 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
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Thread t = newStartedThread(new CheckedRunnable() { |
111 |
jsr166 |
1.13 |
public void realRun() throws InterruptedException { |
112 |
jsr166 |
1.20 |
Thread.currentThread().interrupt(); |
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try { |
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l.await(); |
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shouldThrow(); |
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} catch (InterruptedException success) {} |
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assertFalse(Thread.interrupted()); |
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pleaseInterrupt.countDown(); |
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try { |
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l.await(); |
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shouldThrow(); |
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} catch (InterruptedException success) {} |
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assertFalse(Thread.interrupted()); |
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assertEquals(1, l.getCount()); |
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jsr166 |
1.13 |
}}); |
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jsr166 |
1.20 |
await(pleaseInterrupt); |
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assertThreadStaysAlive(t); |
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jsr166 |
1.13 |
t.interrupt(); |
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jsr166 |
1.20 |
awaitTermination(t); |
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dl |
1.1 |
} |
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dl |
1.3 |
/** |
136 |
dl |
1.5 |
* timed await throws IE if interrupted before counted down |
137 |
dl |
1.3 |
*/ |
138 |
jsr166 |
1.20 |
public void testTimedAwait_Interruptible() { |
139 |
dl |
1.1 |
final CountDownLatch l = new CountDownLatch(1); |
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jsr166 |
1.20 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
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Thread t = newStartedThread(new CheckedRunnable() { |
142 |
jsr166 |
1.13 |
public void realRun() throws InterruptedException { |
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jsr166 |
1.20 |
Thread.currentThread().interrupt(); |
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try { |
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l.await(LONG_DELAY_MS, MILLISECONDS); |
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shouldThrow(); |
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} catch (InterruptedException success) {} |
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assertFalse(Thread.interrupted()); |
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pleaseInterrupt.countDown(); |
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try { |
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l.await(LONG_DELAY_MS, MILLISECONDS); |
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shouldThrow(); |
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} catch (InterruptedException success) {} |
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assertFalse(Thread.interrupted()); |
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assertEquals(1, l.getCount()); |
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jsr166 |
1.13 |
}}); |
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jsr166 |
1.20 |
await(pleaseInterrupt); |
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assertThreadStaysAlive(t); |
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jsr166 |
1.13 |
t.interrupt(); |
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jsr166 |
1.20 |
awaitTermination(t); |
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dl |
1.1 |
} |
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|
166 |
dl |
1.3 |
/** |
167 |
dl |
1.4 |
* timed await times out if not counted down before timeout |
168 |
dl |
1.3 |
*/ |
169 |
jsr166 |
1.13 |
public void testAwaitTimeout() throws InterruptedException { |
170 |
dl |
1.1 |
final CountDownLatch l = new CountDownLatch(1); |
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jsr166 |
1.20 |
Thread t = newStartedThread(new CheckedRunnable() { |
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jsr166 |
1.13 |
public void realRun() throws InterruptedException { |
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jsr166 |
1.20 |
assertEquals(1, l.getCount()); |
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assertFalse(l.await(timeoutMillis(), MILLISECONDS)); |
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assertEquals(1, l.getCount()); |
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jsr166 |
1.13 |
}}); |
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178 |
jsr166 |
1.20 |
awaitTermination(t); |
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assertEquals(1, l.getCount()); |
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dl |
1.1 |
} |
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182 |
dl |
1.7 |
/** |
183 |
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* toString indicates current count |
184 |
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*/ |
185 |
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public void testToString() { |
186 |
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CountDownLatch s = new CountDownLatch(2); |
187 |
jsr166 |
1.18 |
assertTrue(s.toString().contains("Count = 2")); |
188 |
dl |
1.7 |
s.countDown(); |
189 |
jsr166 |
1.18 |
assertTrue(s.toString().contains("Count = 1")); |
190 |
dl |
1.7 |
s.countDown(); |
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jsr166 |
1.18 |
assertTrue(s.toString().contains("Count = 0")); |
192 |
dl |
1.7 |
} |
193 |
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dl |
1.1 |
} |