1 |
dl |
1.1 |
/* |
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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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* Other contributors include John Vint |
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*/ |
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import java.util.ArrayList; |
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import java.util.List; |
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import java.util.concurrent.atomic.AtomicInteger; |
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import java.util.concurrent.*; |
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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public class PhaserTest 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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} |
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21 |
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public static Test suite() { |
22 |
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return new TestSuite(PhaserTest.class); |
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} |
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/** |
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* Empty constructor builds a new Phaser with no parent, no registered |
27 |
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* parties and initial phase number of 0 |
28 |
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*/ |
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public void testConstructor1() { |
30 |
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Phaser phaser = new Phaser(); |
31 |
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assertNull(phaser.getParent()); |
32 |
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assertEquals(0, phaser.getArrivedParties()); |
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assertEquals(0, phaser.getPhase()); |
34 |
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} |
35 |
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36 |
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/** |
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* A negative party number for the constructor throws illegal argument |
38 |
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* exception |
39 |
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*/ |
40 |
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public void testConstructor2() { |
41 |
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try { |
42 |
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new Phaser(-1); |
43 |
jsr166 |
1.6 |
shouldThrow(); |
44 |
dl |
1.1 |
} catch (IllegalArgumentException success) { |
45 |
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} |
46 |
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} |
47 |
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48 |
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/** |
49 |
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* The parent being input into the constructor should equal the original |
50 |
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* parent when being returned |
51 |
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*/ |
52 |
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public void testConstructor3() { |
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Phaser parent = new Phaser(); |
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assertEquals(parent, new Phaser(parent).getParent()); |
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} |
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57 |
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/** |
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* A negative party number for the constructor throws illegal argument |
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* exception |
60 |
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*/ |
61 |
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public void testConstructor4() { |
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try { |
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new Phaser(new Phaser(), -1); |
64 |
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shouldThrow(); |
65 |
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} catch (IllegalArgumentException success) { |
66 |
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} |
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} |
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/** |
70 |
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* The parent being input into the parameter should equal the original |
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* parent when being returned |
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*/ |
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public void testConstructor5() { |
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Phaser parent = new Phaser(); |
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assertEquals(parent, new Phaser(parent, 0).getParent()); |
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} |
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/** |
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* register() will increment the number of unarrived parties by one and not |
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* affect its arrived parties |
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*/ |
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public void testRegister1() { |
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Phaser phaser = new Phaser(); |
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assertEquals(0, phaser.getUnarrivedParties()); |
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phaser.register(); |
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assertEquals(1, phaser.getUnarrivedParties()); |
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assertEquals(0, phaser.getArrivedParties()); |
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} |
89 |
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90 |
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/** |
91 |
jsr166 |
1.4 |
* Registering more than 65536 parties causes IllegalStateException |
92 |
dl |
1.1 |
*/ |
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public void testRegister2() { |
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Phaser phaser = new Phaser(0); |
95 |
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int expectedUnnarivedParties = (1 << 16) - 1; |
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for (int i = 0; i < expectedUnnarivedParties; i++) { |
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phaser.register(); |
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assertEquals(i + 1, phaser.getUnarrivedParties()); |
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} |
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try { |
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phaser.register(); |
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shouldThrow(); |
103 |
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} catch (IllegalStateException success) { |
104 |
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} |
105 |
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} |
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/** |
108 |
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* register() correctly returns the current barrier phase number when |
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* invoked |
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*/ |
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public void testRegister3() { |
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Phaser phaser = new Phaser(); |
113 |
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assertEquals(0, phaser.register()); |
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phaser.arrive(); |
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assertEquals(1, phaser.register()); |
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} |
117 |
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118 |
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/** |
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* register causes the next arrive to not increment the phase rather retain |
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* the phase number |
121 |
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*/ |
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public void testRegister4() { |
123 |
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Phaser phaser = new Phaser(1); |
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phaser.arrive(); |
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int expectedPhase = phaser.register(); |
126 |
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phaser.arrive(); |
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assertEquals(expectedPhase, phaser.getPhase()); |
128 |
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} |
129 |
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130 |
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public void testRegister5() { |
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Phaser phaser = new Phaser(); |
132 |
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phaser.register(); |
133 |
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assertEquals(1, phaser.getUnarrivedParties()); |
134 |
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} |
135 |
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136 |
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/** |
137 |
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* Invoking bulkRegister with a negative parameter throws an |
138 |
jsr166 |
1.4 |
* IllegalArgumentException |
139 |
dl |
1.1 |
*/ |
140 |
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public void testBulkRegister1() { |
141 |
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try { |
142 |
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new Phaser().bulkRegister(-1); |
143 |
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shouldThrow(); |
144 |
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} catch (IllegalArgumentException success) { |
145 |
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} |
146 |
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} |
147 |
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148 |
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/** |
149 |
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* bulkRegister should correctly record the number of unarrived parties with |
150 |
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* the number of parties being registered |
151 |
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*/ |
152 |
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public void testBulkRegister2() { |
153 |
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Phaser phaser = new Phaser(); |
154 |
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phaser.bulkRegister(20); |
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assertEquals(20, phaser.getUnarrivedParties()); |
156 |
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} |
157 |
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/** |
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jsr166 |
1.4 |
* Registering with a number of parties greater than or equal to 1<<16 |
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* throws IllegalStateException. |
161 |
dl |
1.1 |
*/ |
162 |
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public void testBulkRegister3() { |
163 |
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try { |
164 |
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new Phaser().bulkRegister(1 << 16); |
165 |
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shouldThrow(); |
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} catch (IllegalStateException success) { |
167 |
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} |
168 |
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} |
169 |
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170 |
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/** |
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* the phase number increments correctly when tripping the barrier |
172 |
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*/ |
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public void testPhaseIncrement1() { |
174 |
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for (int size = 1; size < nine; size++) { |
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final Phaser phaser = new Phaser(size); |
176 |
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for (int index = 0; index <= (1 << size); index++) { |
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int phase = phaser.arrive(); |
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assertTrue(index % size == 0 ? (index / size) == phase : index - (phase * size) > 0); |
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} |
180 |
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} |
181 |
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} |
182 |
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183 |
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/** |
184 |
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* Arrive() on a registered phaser increments phase. |
185 |
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*/ |
186 |
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public void testArrive1() { |
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Phaser phaser = new Phaser(1); |
188 |
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phaser.arrive(); |
189 |
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assertEquals(1, phaser.getPhase()); |
190 |
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} |
191 |
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/** |
193 |
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* arrive does not wait for others to arrive at barrier |
194 |
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*/ |
195 |
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public void testArrive2() { |
196 |
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final Phaser phaser = new Phaser(1); |
197 |
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phaser.register(); |
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Thread thread = null; |
199 |
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for (final Runnable r : getRunnables(10, SHORT_DELAY_MS)) { |
200 |
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phaser.register(); |
201 |
jsr166 |
1.5 |
thread = new Thread(new CheckedRunnable() { |
202 |
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void realRun() { |
203 |
dl |
1.1 |
r.run(); |
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phaser.arriveAndDeregister(); |
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jsr166 |
1.5 |
}}); |
206 |
dl |
1.1 |
thread.start(); |
207 |
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} |
208 |
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209 |
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phaser.arrive(); |
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assertTrue(thread.isAlive()); |
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assertFalse(phaser.isTerminated()); |
212 |
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} |
213 |
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214 |
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/** |
215 |
jsr166 |
1.3 |
* arrive() returns a negative number if the Phaser is terminated |
216 |
dl |
1.1 |
*/ |
217 |
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public void testArrive3() { |
218 |
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Phaser phaser = new Phaser(1); |
219 |
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phaser.forceTermination(); |
220 |
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assertTrue(phaser.arrive() < 0); |
221 |
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222 |
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} |
223 |
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224 |
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/** |
225 |
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* arriveAndDeregister() throws IllegalStateException if number of |
226 |
jsr166 |
1.3 |
* registered or unarrived parties would become negative |
227 |
dl |
1.1 |
*/ |
228 |
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public void testArriveAndDeregister1() { |
229 |
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try { |
230 |
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Phaser phaser = new Phaser(); |
231 |
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phaser.arriveAndDeregister(); |
232 |
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shouldThrow(); |
233 |
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} catch (IllegalStateException success) { |
234 |
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} |
235 |
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} |
236 |
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237 |
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/** |
238 |
jsr166 |
1.3 |
* arriveAndDeregister deregisters reduces the number of arrived parties |
239 |
dl |
1.1 |
*/ |
240 |
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public void testArriveAndDergeister2() { |
241 |
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final Phaser phaser = new Phaser(1); |
242 |
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phaser.register(); |
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phaser.arrive(); |
244 |
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int p = phaser.getArrivedParties(); |
245 |
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assertTrue(p == 1); |
246 |
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phaser.arriveAndDeregister(); |
247 |
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assertTrue(phaser.getArrivedParties() < p); |
248 |
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} |
249 |
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250 |
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/** |
251 |
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* arriveAndDeregister arrives to the barrier on a phaser with a parent and |
252 |
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* when a deregistration occurs and causes the phaser to have zero parties |
253 |
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* its parent will be deregistered as well |
254 |
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*/ |
255 |
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public void testArriveAndDeregsiter3() { |
256 |
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Phaser parent = new Phaser(); |
257 |
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Phaser root = new Phaser(parent); |
258 |
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root.register(); |
259 |
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assertTrue(parent.getUnarrivedParties() > 0); |
260 |
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assertTrue(root.getUnarrivedParties() > 0); |
261 |
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root.arriveAndDeregister(); |
262 |
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assertTrue(parent.getUnarrivedParties() == 0); |
263 |
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assertTrue(root.getUnarrivedParties() == 0); |
264 |
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assertTrue(root.isTerminated() && parent.isTerminated()); |
265 |
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} |
266 |
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267 |
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/** |
268 |
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* arriveAndDeregister deregisters one party from its parent when |
269 |
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* the number of parties of root is zero after deregistration |
270 |
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*/ |
271 |
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public void testArriveAndDeregsiter4() { |
272 |
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Phaser parent = new Phaser(); |
273 |
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Phaser root = new Phaser(parent); |
274 |
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parent.register(); |
275 |
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root.register(); |
276 |
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int parentParties = parent.getUnarrivedParties(); |
277 |
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root.arriveAndDeregister(); |
278 |
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assertEquals(parentParties - 1, parent.getUnarrivedParties()); |
279 |
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} |
280 |
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281 |
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/** |
282 |
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* arriveAndDeregister deregisters one party from its parent when |
283 |
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* the number of parties of root is nonzero after deregistration. |
284 |
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*/ |
285 |
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public void testArriveAndDeregister5() { |
286 |
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Phaser parent = new Phaser(); |
287 |
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Phaser child = new Phaser(parent); |
288 |
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Phaser root = new Phaser(child); |
289 |
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assertTrue(parent.getUnarrivedParties() > 0); |
290 |
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assertTrue(child.getUnarrivedParties() > 0); |
291 |
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root.register(); |
292 |
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root.arriveAndDeregister(); |
293 |
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assertTrue(parent.getUnarrivedParties() == 0); |
294 |
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assertTrue(child.getUnarrivedParties() == 0); |
295 |
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assertTrue(root.isTerminated()); |
296 |
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} |
297 |
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298 |
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/** |
299 |
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* arriveAndDeregister returns the phase in which it leaves the |
300 |
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* phaser in after deregistration |
301 |
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*/ |
302 |
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public void testArriveAndDeregister6() { |
303 |
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final Phaser phaser = new Phaser(2); |
304 |
jsr166 |
1.5 |
new Thread(new CheckedRunnable() { |
305 |
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void realRun() { |
306 |
dl |
1.1 |
getRunnable(SHORT_DELAY_MS).run(); |
307 |
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phaser.arrive(); |
308 |
jsr166 |
1.5 |
}}).start(); |
309 |
dl |
1.1 |
phaser.arriveAndAwaitAdvance(); |
310 |
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int phase = phaser.arriveAndDeregister(); |
311 |
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assertEquals(phase, phaser.getPhase()); |
312 |
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} |
313 |
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314 |
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/** |
315 |
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* awaitAdvance succeeds upon advance |
316 |
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*/ |
317 |
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public void testAwaitAdvance1() { |
318 |
|
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final Phaser phaser = new Phaser(1); |
319 |
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phaser.awaitAdvance(phaser.arrive()); |
320 |
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} |
321 |
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322 |
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/** |
323 |
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* awaitAdvance with a negative parameter will return without affecting the |
324 |
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* phaser |
325 |
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*/ |
326 |
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public void testAwaitAdvance2() { |
327 |
jsr166 |
1.6 |
Phaser phaser = new Phaser(); |
328 |
|
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phaser.awaitAdvance(-1); |
329 |
dl |
1.1 |
} |
330 |
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331 |
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/** |
332 |
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* awaitAdvance while waiting does not abort on interrupt. |
333 |
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*/ |
334 |
jsr166 |
1.6 |
public void testAwaitAdvance3() throws InterruptedException { |
335 |
dl |
1.1 |
final Phaser phaser = new Phaser(); |
336 |
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|
337 |
jsr166 |
1.5 |
Thread th1 = new Thread(new CheckedRunnable() { |
338 |
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void realRun() throws InterruptedException { |
339 |
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phaser.register(); |
340 |
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getRunnable(LONG_DELAY_MS).run(); |
341 |
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phaser.awaitAdvance(phaser.arrive()); |
342 |
|
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}}); |
343 |
dl |
1.1 |
phaser.register(); |
344 |
|
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th1.start(); |
345 |
jsr166 |
1.6 |
Thread.sleep(SHORT_DELAY_MS); |
346 |
|
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th1.interrupt(); |
347 |
|
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Thread.sleep(LONG_DELAY_MS); |
348 |
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phaser.arrive(); |
349 |
dl |
1.1 |
assertFalse(th1.isInterrupted()); |
350 |
|
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} |
351 |
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352 |
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/** |
353 |
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* awaitAdvance atomically waits for all parties within the same phase to |
354 |
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* complete before continuing |
355 |
|
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*/ |
356 |
jsr166 |
1.5 |
public void testAwaitAdvance4() throws InterruptedException { |
357 |
|
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final Phaser phaser = new Phaser(4); |
358 |
dl |
1.1 |
final AtomicInteger phaseCount = new AtomicInteger(0); |
359 |
jsr166 |
1.5 |
List<Thread> threads = new ArrayList<Thread>(); |
360 |
|
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for (int i = 0; i < 4; i++) { |
361 |
|
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threads.add(new Thread(new CheckedRunnable() { |
362 |
|
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void realRun() { |
363 |
dl |
1.1 |
int phase = phaser.arrive(); |
364 |
|
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phaseCount.incrementAndGet(); |
365 |
|
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getRunnable(LONG_DELAY_MS).run(); |
366 |
|
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phaser.awaitAdvance(phase); |
367 |
jsr166 |
1.5 |
threadAssertTrue(phaseCount.get() == 4); |
368 |
|
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}})); |
369 |
dl |
1.1 |
} |
370 |
jsr166 |
1.5 |
for (Thread thread : threads) |
371 |
|
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thread.start(); |
372 |
|
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for (Thread thread : threads) |
373 |
|
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thread.join(); |
374 |
dl |
1.1 |
} |
375 |
|
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|
376 |
|
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/** |
377 |
|
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* awaitAdvance returns the current phase |
378 |
|
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*/ |
379 |
|
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public void testAwaitAdvance5() { |
380 |
|
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final Phaser phaser = new Phaser(1); |
381 |
|
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int phase = phaser.awaitAdvance(phaser.arrive()); |
382 |
|
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assertEquals(phase, phaser.getPhase()); |
383 |
|
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phaser.register(); |
384 |
|
|
for (int i = 0; i < eight; i++) { |
385 |
jsr166 |
1.5 |
new Thread(new CheckedRunnable() { |
386 |
|
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void realRun() { |
387 |
dl |
1.1 |
getRunnable(SHORT_DELAY_MS).run(); |
388 |
|
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phaser.arrive(); |
389 |
jsr166 |
1.6 |
}}).start(); |
390 |
dl |
1.1 |
phase = phaser.awaitAdvance(phaser.arrive()); |
391 |
jsr166 |
1.5 |
threadAssertEquals(phase, phaser.getPhase()); |
392 |
dl |
1.1 |
} |
393 |
|
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} |
394 |
|
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|
395 |
|
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/** |
396 |
|
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* awaitAdvance returns when the phaser is externally terminated |
397 |
|
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*/ |
398 |
|
|
public void testAwaitAdvance6() { |
399 |
|
|
final Phaser phaser = new Phaser(3); |
400 |
|
|
/* |
401 |
|
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* Start new thread. This thread waits a small amount of time |
402 |
|
|
* and waits for the other two parties to arrive. The party |
403 |
|
|
* in the main thread arrives quickly so at best this thread |
404 |
|
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* waits for the second thread's party to arrive |
405 |
|
|
*/ |
406 |
jsr166 |
1.5 |
new Thread(new CheckedRunnable() { |
407 |
|
|
void realRun() { |
408 |
dl |
1.1 |
getRunnable(SMALL_DELAY_MS).run(); |
409 |
|
|
int phase = phaser.awaitAdvance(phaser.arrive()); |
410 |
|
|
/* |
411 |
|
|
* This point is reached when force termination is called in which phase = -1 |
412 |
|
|
*/ |
413 |
|
|
threadAssertTrue(phase < 0); |
414 |
|
|
threadAssertTrue(phaser.isTerminated()); |
415 |
jsr166 |
1.5 |
}}).start(); |
416 |
dl |
1.1 |
/* |
417 |
|
|
* This thread will cause the first thread run to wait, in doing so |
418 |
jsr166 |
1.2 |
* the main thread will force termination in which the first thread |
419 |
|
|
* should exit peacefully as this one |
420 |
dl |
1.1 |
*/ |
421 |
jsr166 |
1.5 |
new Thread(new CheckedRunnable() { |
422 |
|
|
void realRun() { |
423 |
dl |
1.1 |
getRunnable(LONG_DELAY_MS).run(); |
424 |
|
|
int p1 = phaser.arrive(); |
425 |
|
|
int phase = phaser.awaitAdvance(p1); |
426 |
|
|
threadAssertTrue(phase < 0); |
427 |
|
|
threadAssertTrue(phaser.isTerminated()); |
428 |
jsr166 |
1.5 |
}}).start(); |
429 |
dl |
1.1 |
|
430 |
|
|
phaser.arrive(); |
431 |
|
|
phaser.forceTermination(); |
432 |
|
|
} |
433 |
|
|
|
434 |
|
|
/** |
435 |
|
|
* arriveAndAwaitAdvance throws IllegalStateException with no |
436 |
|
|
* unarrived parties |
437 |
|
|
*/ |
438 |
|
|
public void testArriveAndAwaitAdvance1() { |
439 |
|
|
try { |
440 |
|
|
Phaser phaser = new Phaser(); |
441 |
|
|
phaser.arriveAndAwaitAdvance(); |
442 |
|
|
shouldThrow(); |
443 |
|
|
} catch (IllegalStateException success) { |
444 |
|
|
} |
445 |
|
|
} |
446 |
|
|
|
447 |
|
|
/** |
448 |
|
|
* Interrupted arriveAndAwaitAdvance does not throw InterruptedException |
449 |
|
|
*/ |
450 |
jsr166 |
1.6 |
public void testArriveAndAwaitAdvance2() throws InterruptedException { |
451 |
dl |
1.1 |
final Phaser phaser = new Phaser(2); |
452 |
jsr166 |
1.5 |
Thread th = new Thread(new CheckedRunnable() { |
453 |
|
|
void realRun() { |
454 |
|
|
phaser.arriveAndAwaitAdvance(); |
455 |
|
|
}}); |
456 |
dl |
1.1 |
|
457 |
jsr166 |
1.6 |
th.start(); |
458 |
|
|
Thread.sleep(LONG_DELAY_MS); |
459 |
|
|
th.interrupt(); |
460 |
|
|
Thread.sleep(LONG_DELAY_MS); |
461 |
|
|
phaser.arrive(); |
462 |
dl |
1.1 |
assertFalse(th.isInterrupted()); |
463 |
|
|
} |
464 |
|
|
|
465 |
|
|
/** |
466 |
|
|
* arriveAndAwaitAdvance waits for all threads to arrive, the |
467 |
|
|
* number of arrived parties is the same number that is accounted |
468 |
|
|
* for when the main thread awaitsAdvance |
469 |
|
|
*/ |
470 |
|
|
public void testArriveAndAwaitAdvance3() { |
471 |
|
|
final Phaser phaser = new Phaser(1); |
472 |
|
|
final AtomicInteger arrivingCount = new AtomicInteger(0); |
473 |
|
|
for (final Runnable run : getRunnables(six, SHORT_DELAY_MS)) { |
474 |
jsr166 |
1.5 |
new Thread(new CheckedRunnable() { |
475 |
|
|
void realRun() { |
476 |
dl |
1.1 |
phaser.register(); |
477 |
|
|
run.run(); |
478 |
|
|
arrivingCount.getAndIncrement(); |
479 |
|
|
phaser.arrive(); |
480 |
jsr166 |
1.5 |
}}).start(); |
481 |
dl |
1.1 |
} |
482 |
|
|
int phaseNumber = phaser.arriveAndAwaitAdvance(); |
483 |
|
|
arrivingCount.incrementAndGet(); |
484 |
|
|
//the + 1 adds to expectedArrive to account for the main threads arrival |
485 |
|
|
int expectedArrived = phaseNumber > 0 ? phaseNumber * six + 1 : phaser.getArrivedParties() + 1; |
486 |
|
|
threadAssertEquals(expectedArrived, arrivingCount.get()); |
487 |
|
|
} |
488 |
|
|
// .. initially called, for n tasks via |
489 |
|
|
private List<Runnable> getRunnables(int size, long wait) { |
490 |
|
|
List<Runnable> list = new ArrayList<Runnable>(); |
491 |
|
|
for (int i = 0; i < size; i++) { |
492 |
|
|
list.add(getRunnable(wait)); |
493 |
|
|
} |
494 |
|
|
return list; |
495 |
|
|
} |
496 |
|
|
|
497 |
|
|
private Runnable getRunnable(final long wait) { |
498 |
jsr166 |
1.5 |
return new CheckedRunnable() { |
499 |
|
|
void realRun() { |
500 |
dl |
1.1 |
try { |
501 |
|
|
Thread.sleep(wait); |
502 |
|
|
} catch (InterruptedException noop) { |
503 |
|
|
// sleep interruption isn't a problem case for these example |
504 |
|
|
} |
505 |
|
|
} |
506 |
|
|
}; |
507 |
|
|
} |
508 |
|
|
|
509 |
|
|
} |