/*

 * 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.

 *

 */

/**

 * @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.*;

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();}

}