Quelle ViewSynch.java Sprache: 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.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();}
}

quality87%

¤ Dauer der Verarbeitung: 0.14 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.