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/* |
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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/* |
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* @test |
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* @bug 6318638 6325166 6330307 |
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* @summary CopyOnWriteArrayList.equals should be thread-safe |
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* @author Martin Buchholz |
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*/ |
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|
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import java.util.Arrays; |
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import java.util.Collections; |
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import java.util.List; |
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import java.util.concurrent.CopyOnWriteArrayList; |
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|
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public class EqualsRace { |
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private static void realMain(String[] args) throws Throwable { |
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final int iterations = 100000; |
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final List<Integer> list = new CopyOnWriteArrayList<>(); |
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final Integer one = Integer.valueOf(1); |
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final List<Integer> oneElementList = Arrays.asList(one); |
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final Thread t = new CheckedThread() { public void realRun() { |
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for (int i = 0; i < iterations; i++) { |
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list.add(one); |
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list.remove(one); |
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}}}; |
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t.start(); |
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|
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for (int i = 0; i < iterations; i++) { |
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list.equals(oneElementList); |
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list.equals(Collections.EMPTY_LIST); |
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} |
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t.join(); |
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check(list.size() == 0); |
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} |
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|
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//--------------------- Infrastructure --------------------------- |
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static volatile int passed = 0, failed = 0; |
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static void pass() {passed++;} |
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static void fail() {failed++; Thread.dumpStack();} |
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static void fail(String msg) {System.out.println(msg); fail();} |
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static void unexpected(Throwable t) {failed++; t.printStackTrace();} |
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static void check(boolean cond) {if (cond) pass(); else fail();} |
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static void equal(Object x, Object y) { |
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if (x == null ? y == null : x.equals(y)) pass(); |
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else fail(x + " not equal to " + y);} |
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public static void main(String[] args) throws Throwable { |
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try {realMain(args);} catch (Throwable t) {unexpected(t);} |
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System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); |
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if (failed > 0) throw new AssertionError("Some tests failed");} |
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private abstract static class CheckedThread extends Thread { |
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public abstract void realRun() throws Throwable; |
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public void run() { |
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try { realRun(); } catch (Throwable t) { unexpected(t); }}} |
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} |
