82 lines
2.8 KiB
Java
82 lines
2.8 KiB
Java
/*
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* Copyright 2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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/*
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* @test
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* @bug 4486658
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* @summary thread safety of toArray methods of subCollections
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* @author Martin Buchholz
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*/
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import java.util.*;
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import java.util.concurrent.*;
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public class toArray {
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public static void main(String[] args) throws Throwable {
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final Throwable throwable[] = new Throwable[1];
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final int maxSize = 1000;
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final ConcurrentHashMap<Integer, Integer> m
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= new ConcurrentHashMap<Integer, Integer>();
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final Thread t1 = new Thread() { public void run() {
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for (int i = 0; i < maxSize; i++)
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m.put(i,i);}};
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final Thread t2 = new Thread() {
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public Throwable exception = null;
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private int prevSize = 0;
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private boolean checkProgress(Object[] a) {
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int size = a.length;
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if (size < prevSize) throw new RuntimeException("WRONG WAY");
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if (size > maxSize) throw new RuntimeException("OVERSHOOT");
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if (size == maxSize) return true;
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prevSize = size;
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return false;
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}
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public void run() {
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try {
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Integer[] empty = new Integer[0];
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while (true) {
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if (checkProgress(m.values().toArray())) return;
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if (checkProgress(m.keySet().toArray())) return;
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if (checkProgress(m.values().toArray(empty))) return;
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if (checkProgress(m.keySet().toArray(empty))) return;
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}
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} catch (Throwable t) {
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throwable[0] = t;
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}}};
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t2.start();
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t1.start();
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t1.join();
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t2.join();
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if (throwable[0] != null)
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throw throwable[0];
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}
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}
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