135 lines
5.2 KiB
Java
135 lines
5.2 KiB
Java
/*
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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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* @test
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* @bug 6330307 6355645
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* @summary Check for race conditions in COWArray classes
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* @author Martin Buchholz
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*/
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import java.util.List;
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import java.util.Set;
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import java.util.concurrent.CopyOnWriteArrayList;
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import java.util.concurrent.CopyOnWriteArraySet;
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public class RacingCows {
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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 Integer two = Integer.valueOf(2);
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final Integer three = Integer.valueOf(3);
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//------------ CopyOnWriteArraySet -------------------------------
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final Set<Integer> s1 = new CopyOnWriteArraySet<>();
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final Set<Integer> s2 = new CopyOnWriteArraySet<>();
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s1.add(1);
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final Thread t1 = new CheckedThread() { public void realRun() {
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for (int i = 0; i < iterations; i++) {
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s2.add(two);
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s2.remove(two);
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}}};
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t1.start();
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for (int i = 0; i < iterations; i++) {
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check(! s1.equals(s2));
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check(! s2.equals(s1));
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}
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t1.join();
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//------------ CopyOnWriteArrayList ------------------------------
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final List<Integer> l1 = new CopyOnWriteArrayList<>();
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final List<Integer> l2 = new CopyOnWriteArrayList<>();
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final List<Integer> l3 = new CopyOnWriteArrayList<>();
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l1.add(1);
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final Thread t2 = new CheckedThread() { public void realRun() {
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for (int i = 0; i < iterations; i++) {
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switch (i%2) {
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case 0: l2.add(two); break;
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case 1: l2.add(0, two); break;
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}
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switch (i%3) {
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case 0: l2.remove(two); break;
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case 1: l2.remove(0); break;
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case 2: l2.clear(); break;
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}}}};
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t2.start();
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final Thread t3 = new CheckedThread() { public void realRun() {
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l3.add(three);
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for (int i = 0; i < iterations; i++) {
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switch (i%2) {
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case 0: l3.add(two); break;
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case 1: l3.add(0, two); break;
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}
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switch (i%2) {
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case 0: l3.remove(two); break;
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case 1: l3.remove(0); break;
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}}}};
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t3.start();
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for (int i = 0; i < iterations; i++) {
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check(! l1.equals(l2));
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check(! l2.equals(l1));
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// CopyOnWriteArrayList(mutatingCollection)
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try { new CopyOnWriteArrayList<Integer>(l2); }
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catch (Throwable t) { unexpected(t); }
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// addAllAbsent(mutatingCollection)
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try { new CopyOnWriteArrayList<Integer>().addAllAbsent(l3); }
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catch (Throwable t) { unexpected(t); }
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// addAll(mutatingCollection)
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try { new CopyOnWriteArrayList<Integer>().addAll(l3); }
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catch (Throwable t) { unexpected(t); }
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// addAll(int, mutatingCollection)
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try { new CopyOnWriteArrayList<Integer>().addAll(0,l3); }
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catch (Throwable t) { unexpected(t); }
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}
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t2.join();
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t3.join();
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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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}
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