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Datei: HoldsLock.java Sprache: JAVA

/*
* Copyright (c) 2000, 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     4363076
* @summary Basic functional test of Thread.holdsLock(Object)
* @author  Josh Bloch and Steffen Grarup
*/

public class HoldsLock {
    private static Object target = null;

    private static void checkLock(boolean value) {
        if (Thread.holdsLock(target) != value)
            throw new RuntimeException("Should be " + value);
    }

    static class LockThread extends Thread {
        public void run() {
            checkLock(false);
            synchronized(target) {
                checkLock(true);
            }
            checkLock(false);
        }
    }

    public static void main(String args[]) throws Exception {
        // Test null obj case
        try {
            checkLock(false);
            throw new RuntimeException("NullPointerException not thrown");
        } catch (NullPointerException e) {
        };

        // Test uncontested case
        target = new Object();
        checkLock(false);
        synchronized(target) {
            checkLock(true);
        }
        checkLock(false);

        // Test contested case
        synchronized(target) {
            checkLock(true);
            new LockThread().start();
            checkLock(true);
            Thread.sleep(100);
            checkLock(true);
        }
        checkLock(false);
    }
}

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