80 lines
2.4 KiB
Java
80 lines
2.4 KiB
Java
/*
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* Copyright (c) 1999, 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 4268780
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* @summary Collection-views of submap-views of synchronized-views of
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* SortedMap objects do not synchronize on the correct object.
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* (Got that?)
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*/
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import java.util.Collection;
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import java.util.Collections;
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import java.util.Map;
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import java.util.SortedMap;
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import java.util.TreeMap;
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public class ViewSynch {
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static final Integer ZERO = new Integer(0);
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static final Int INT_ZERO = new Int(0);
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static final Int INT_ONE = new Int(1);
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static SortedMap m = Collections.synchronizedSortedMap(new TreeMap());
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static Map m2 = m.tailMap(ZERO);
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static Collection c = m2.values();
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public static void main(String[] args) {
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for (int i=0; i<10000; i++)
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m.put(new Integer(i), INT_ZERO);
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new Thread() {
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public void run() {
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for (int i=0; i<100; i++) {
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Thread.yield();
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m.remove(ZERO);
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m.put(ZERO, INT_ZERO);
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}
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}
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}.start();
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c.contains(INT_ONE);
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}
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}
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/**
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* Like Integer, except yields while doing equals comparison, to allow
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* for interleaving.
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*/
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class Int {
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Integer x;
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Int(int i) {x = new Integer(i);}
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public boolean equals(Object o) {
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Thread.yield();
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Int i = (Int)o;
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return x.equals(i.x);
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}
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public int hashCode() {return x.hashCode();}
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}
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