test/hotspot/jtreg/vmTestbase/nsk/share/locks/DeadlockedThread.java

/*
 * Copyright (c) 2007, 2018, 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.
 */
package nsk.share.locks;

import nsk.share.Wicket;

/*
 *  Thread class used for deadlock creation, requires instance of DeadlockLocker to created deadlock.
 *  Objects of DeadlockedThread should not be created directly, to create deadlocked threads
 *  use class DeadlockMaker
 */
public class DeadlockedThread extends Thread {
    private DeadlockLocker locker;

    private Wicket dedlockResolutionWicket = new Wicket();

    // should call readyWicket.unlock() when deadlock is ready
    public DeadlockedThread(DeadlockLocker locker) {
        this.locker = locker;
    }

    public void run() {
        locker.lock();

        // reach here if deadlock was resolved
        dedlockResolutionWicket.unlockAll();

        // sleep if deadlock was resolved
        try {
            sleep(Long.MAX_VALUE);
        } catch (InterruptedException e) {
            // ignore
        }
    }

    // If it is expected that deadlock with using of this DeadlockedThread should be resolved
    // this method can be used for waiting this event
    public void waitDeadlockResolution() {
        // if deadlock was resolved DeadlockedThread calls dedlockResolutionWicket.unlockAll()
        dedlockResolutionWicket.waitFor();
    }

    public DeadlockLocker getLocker() {
        return locker;
    }

}