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/*
* Copyright (c) 1999, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 4268780
* @summary Collection-views of submap-views of synchronized-views of
* SortedMap objects do not synchronize on the correct object.
* (Got that?)
*/
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
public class ViewSynch {
static final Integer ZERO = new Integer(0);
static final Int INT_ZERO = new Int(0);
static final Int INT_ONE = new Int(1);
static SortedMap m = Collections.synchronizedSortedMap(new TreeMap());
static Map m2 = m.tailMap(ZERO);
static Collection c = m2.values();
public static void main(String[] args) {
for (int i=0; i<10000; i++)
m.put(new Integer(i), INT_ZERO);
new Thread() {
public void run() {
for (int i=0; i<100; i++) {
Thread.yield();
m.remove(ZERO);
m.put(ZERO, INT_ZERO);
}
}
}.start();
c.contains(INT_ONE);
}
}
/**
* Like Integer, except yields while doing equals comparison, to allow
* for interleaving.
*/
class Int {
Integer x;
Int(int i) {x = new Integer(i);}
public boolean equals(Object o) {
Thread.yield();
Int i = (Int)o;
return x.equals(i.x);
}
public int hashCode() {return x.hashCode();}
}
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