util/Collections/ViewSynch.java

/*
 * 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.*;

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();}
}
Revision:	1.3
Committed:	Sat Oct 21 00:44:23 2017 UTC (6 years, 6 months ago) by jsr166
Branch:	MAIN
Changes since 1.2:	+1 -1 lines
Log Message:	jtreg @test comments are not javadoc comments
#	User	Rev	Content
1	jsr166	1.1	/*
2	jsr166	1.2	* Copyright (c) 1999, Oracle and/or its affiliates. All rights reserved.
3	jsr166	1.1	* 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	jsr166	1.2	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20			* or visit www.oracle.com if you need additional information or have any
21			* questions.
22	jsr166	1.1	*/
23
24	jsr166	1.3	/*
25	jsr166	1.1	* @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			}