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 6318638 6325166 6330307 27 * @summary CopyOnWriteArrayList.equals should be thread-safe 28 * @author Martin Buchholz 29 */ 30 31 import java.util.*; 32 import java.util.concurrent.*; 33 34 public class EqualsRace { 35 private static void realMain(String[] args) throws Throwable { 36 final int iterations = 100000; 37 final List<Integer> list = new CopyOnWriteArrayList<Integer>(); 38 final Integer one = Integer.valueOf(1); 39 final List<Integer> oneElementList = Arrays.asList(one); 40 final Thread t = new CheckedThread() { public void realRun() { 41 for (int i = 0; i < iterations; i++) { 42 list.add(one); 43 list.remove(one); 44 }}}; 45 t.start(); 46 47 for (int i = 0; i < iterations; i++) { 48 list.equals(oneElementList); 49 list.equals(Collections.EMPTY_LIST); 50 } 51 t.join(); 52 check(list.size() == 0); 53 } 54 55 //--------------------- Infrastructure --------------------------- 56 static volatile int passed = 0, failed = 0; 57 static void pass() {passed++;} 58 static void fail() {failed++; Thread.dumpStack();} 59 static void fail(String msg) {System.out.println(msg); fail();} 60 static void unexpected(Throwable t) {failed++; t.printStackTrace();} 61 static void check(boolean cond) {if (cond) pass(); else fail();} 62 static void equal(Object x, Object y) { 63 if (x == null ? y == null : x.equals(y)) pass(); 64 else fail(x + " not equal to " + y);} 65 public static void main(String[] args) throws Throwable { 66 try {realMain(args);} catch (Throwable t) {unexpected(t);} 67 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); 68 if (failed > 0) throw new AssertionError("Some tests failed");} 69 private static abstract class CheckedThread extends Thread { 70 public abstract void realRun() throws Throwable; 71 public void run() { 72 try { realRun(); } catch (Throwable t) { unexpected(t); }}} 73 }