1 /* 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 */ 22 23 /* 24 * This file is available under and governed by the GNU General Public 25 * License version 2 only, as published by the Free Software Foundation. 26 * However, the following notice accompanied the original version of this 27 * file: 28 * 29 * Written by Martin Buchholz and Doug Lea with assistance from 30 * members of JCP JSR-166 Expert Group and released to the public 31 * domain, as explained at 32 * http://creativecommons.org/licenses/publicdomain 33 */ 34 35 /* 36 * @test 37 * @summary Test Phaser phase integer overflow behavior 38 */ 39 40 import java.util.concurrent.Phaser; 41 import java.lang.reflect.Field; 42 43 public class PhaseOverflow { 44 Field stateField; 45 46 void checkState(Phaser phaser, 47 int phase, int parties, int unarrived) { 48 equal(phase, phaser.getPhase()); 49 equal(parties, phaser.getRegisteredParties()); 50 equal(unarrived, phaser.getUnarrivedParties()); 51 } 52 53 void test(String[] args) throws Throwable { 54 stateField = Phaser.class.getDeclaredField("state"); 55 stateField.setAccessible(true); 56 testLeaf(); 57 testTiered(); 58 } 59 60 void testLeaf() throws Throwable { 61 Phaser phaser = new Phaser(); 62 stateField.setLong(phaser, (Integer.MAX_VALUE - 1L) << 32 ); 63 checkState(phaser, Integer.MAX_VALUE - 1, 0, 0); 64 phaser.register(); 65 checkState(phaser, Integer.MAX_VALUE - 1, 1, 1); 66 phaser.arrive(); 67 checkState(phaser, Integer.MAX_VALUE, 1, 1); 68 phaser.arrive(); 69 checkState(phaser, 0, 1, 1); 70 phaser.arrive(); 71 checkState(phaser, 1, 1, 1); 72 } 73 74 int phaseInc(int phase) { return (phase + 1) & Integer.MAX_VALUE; } 75 76 void testTiered() throws Throwable { 77 Phaser root = new Phaser(); 78 stateField.setLong(root, (Integer.MAX_VALUE - 1L) << 32 ); 79 checkState(root, Integer.MAX_VALUE - 1, 0, 0); 80 Phaser p1 = new Phaser(root, 1); 81 checkState(root, Integer.MAX_VALUE - 1, 1, 1); 82 checkState(p1, Integer.MAX_VALUE - 1, 1, 1); 83 Phaser p2 = new Phaser(root, 2); 84 checkState(root, Integer.MAX_VALUE - 1, 2, 2); 85 checkState(p2, Integer.MAX_VALUE - 1, 2, 2); 86 int ph = Integer.MAX_VALUE - 1; 87 for (int k = 0; k < 5; k++) { 88 checkState(root, ph, 2, 2); 89 checkState(p1, ph, 1, 1); 90 checkState(p2, ph, 2, 2); 91 p1.arrive(); 92 checkState(root, ph, 2, 1); 93 checkState(p1, ph, 1, 0); 94 checkState(p2, ph, 2, 2); 95 p2.arrive(); 96 checkState(root, ph, 2, 1); 97 checkState(p1, ph, 1, 0); 98 checkState(p2, ph, 2, 1); 99 p2.arrive(); 100 ph = phaseInc(ph); 101 checkState(root, ph, 2, 2); 102 checkState(p1, ph, 1, 1); 103 checkState(p2, ph, 2, 2); 104 } 105 equal(3, ph); 106 } 107 108 //--------------------- Infrastructure --------------------------- 109 volatile int passed = 0, failed = 0; 110 void pass() {passed++;} 111 void fail() {failed++; Thread.dumpStack();} 112 void fail(String msg) {System.err.println(msg); fail();} 113 void unexpected(Throwable t) {failed++; t.printStackTrace();} 114 void check(boolean cond) {if (cond) pass(); else fail();} 115 void equal(Object x, Object y) { 116 if (x == null ? y == null : x.equals(y)) pass(); 117 else fail(x + " not equal to " + y);} 118 public static void main(String[] args) throws Throwable { 119 new PhaseOverflow().instanceMain(args);} 120 public void instanceMain(String[] args) throws Throwable { 121 try {test(args);} catch (Throwable t) {unexpected(t);} 122 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); 123 if (failed > 0) throw new AssertionError("Some tests failed");} 124 }