1 /* 2 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 6330307 6355645 27 * @summary Check for race conditions in COWArray classes 28 * @author Martin Buchholz 29 */ 30 31 import java.util.*; 32 import java.util.concurrent.*; 33 34 public class RacingCows { 35 private static void realMain(String[] args) throws Throwable { 36 final int iterations = 100000; 37 final Integer two = Integer.valueOf(2); 38 final Integer three = Integer.valueOf(3); 39 40 //------------ CopyOnWriteArraySet ------------------------------- 41 final Set<Integer> s1 = new CopyOnWriteArraySet<Integer>(); 42 final Set<Integer> s2 = new CopyOnWriteArraySet<Integer>(); 43 s1.add(1); 44 45 final Thread t1 = new CheckedThread() { public void realRun() { 46 for (int i = 0; i < iterations; i++) { 47 s2.add(two); 48 s2.remove(two); 49 }}}; 50 t1.start(); 51 52 for (int i = 0; i < iterations; i++) { 53 check(! s1.equals(s2)); 54 check(! s2.equals(s1)); 55 } 56 t1.join(); 57 58 //------------ CopyOnWriteArrayList ------------------------------ 59 final List<Integer> l1 = new CopyOnWriteArrayList<Integer>(); 60 final List<Integer> l2 = new CopyOnWriteArrayList<Integer>(); 61 final List<Integer> l3 = new CopyOnWriteArrayList<Integer>(); 62 l1.add(1); 63 64 final Thread t2 = new CheckedThread() { public void realRun() { 65 for (int i = 0; i < iterations; i++) { 66 switch (i%2) { 67 case 0: l2.add(two); break; 68 case 1: l2.add(0, two); break; 69 } 70 switch (i%3) { 71 case 0: l2.remove(two); break; 72 case 1: l2.remove(0); break; 73 case 2: l2.clear(); break; 74 }}}}; 75 t2.start(); 76 77 final Thread t3 = new CheckedThread() { public void realRun() { 78 l3.add(three); 79 for (int i = 0; i < iterations; i++) { 80 switch (i%2) { 81 case 0: l3.add(two); break; 82 case 1: l3.add(0, two); break; 83 } 84 switch (i%2) { 85 case 0: l3.remove(two); break; 86 case 1: l3.remove(0); break; 87 }}}}; 88 t3.start(); 89 90 for (int i = 0; i < iterations; i++) { 91 check(! l1.equals(l2)); 92 check(! l2.equals(l1)); 93 94 // CopyOnWriteArrayList(mutatingCollection) 95 try { new CopyOnWriteArrayList<Integer>(l2); } 96 catch (Throwable t) { unexpected(t); } 97 98 // addAllAbsent(mutatingCollection) 99 try { new CopyOnWriteArrayList<Integer>().addAllAbsent(l3); } 100 catch (Throwable t) { unexpected(t); } 101 102 // addAll(mutatingCollection) 103 try { new CopyOnWriteArrayList<Integer>().addAll(l3); } 104 catch (Throwable t) { unexpected(t); } 105 106 // addAll(int, mutatingCollection) 107 try { new CopyOnWriteArrayList<Integer>().addAll(0,l3); } 108 catch (Throwable t) { unexpected(t); } 109 } 110 t2.join(); 111 t3.join(); 112 } 113 114 //--------------------- Infrastructure --------------------------- 115 static volatile int passed = 0, failed = 0; 116 static void pass() {passed++;} 117 static void fail() {failed++; Thread.dumpStack();} 118 static void fail(String msg) {System.out.println(msg); fail();} 119 static void unexpected(Throwable t) {failed++; t.printStackTrace();} 120 static void check(boolean cond) {if (cond) pass(); else fail();} 121 static void equal(Object x, Object y) { 122 if (x == null ? y == null : x.equals(y)) pass(); 123 else fail(x + " not equal to " + y);} 124 public static void main(String[] args) throws Throwable { 125 try {realMain(args);} catch (Throwable t) {unexpected(t);} 126 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); 127 if (failed > 0) throw new AssertionError("Some tests failed");} 128 private abstract static class CheckedThread extends Thread { 129 public abstract void realRun() throws Throwable; 130 public void run() { 131 try { realRun(); } catch (Throwable t) { unexpected(t); }}} 132 }