1 /*

     2  * Copyright 1999 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 /**

    25  * @test

    26  * @bug 4268780

    27  * @summary Collection-views of submap-views of synchronized-views of

    28  *          SortedMap objects do not synchronize on the correct object.

    29  *          (Got that?)

    30  */

    31 

    32 import java.util.*;

    33 

    34 public class ViewSynch {

    35     static final Integer ZERO = new Integer(0);

    36     static final Int INT_ZERO = new Int(0);

    37     static final Int INT_ONE = new Int(1);

    38     static SortedMap m = Collections.synchronizedSortedMap(new TreeMap());

    39     static Map m2 = m.tailMap(ZERO);

    40     static Collection c = m2.values();

    41 

    42     public static void main(String[] args) {

    43         for (int i=0; i<10000; i++)

    44             m.put(new Integer(i), INT_ZERO);

    45 

    46         new Thread() {

    47             public void run() {

    48                 for (int i=0; i<100; i++) {

    49                     Thread.yield();

    50                     m.remove(ZERO);

    51                     m.put(ZERO, INT_ZERO);

    52                 }

    53             }

    54         }.start();

    55 

    56         c.contains(INT_ONE);

    57     }

    58 }

    59 

    60 /**

    61  * Like Integer, except yields while doing equals comparison, to allow

    62  * for interleaving.

    63  */

    64 class Int {

    65     Integer x;

    66     Int(int i) {x = new Integer(i);}

    67 

    68     public boolean equals(Object o) {

    69         Thread.yield();

    70         Int i = (Int)o;

    71         return x.equals(i.x);

    72     }

    73 

    74     public int hashCode() {return x.hashCode();}

    75 }