test/hotspot/jtreg/vmTestbase/nsk/jvmti/scenarios/contention/TC02/tc02t001.java

/*
 * Copyright (c) 2004, 2019, 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.jvmti.scenarios.contention.TC02;

import java.io.PrintStream;

import nsk.share.*;
import nsk.share.jvmti.*;

//    THIS CLASS IS LINE NUMBER SENSITIVE

class tc02t001Thread extends Thread {
    public Wicket startingBarrier = new Wicket();
    public Wicket waitingBarrier1 = new Wicket();
    public Wicket waitingBarrier2 = new Wicket();
    public Wicket waitingBarrier3 = new Wicket();
    public Object M = new Object();

    public tc02t001Thread(String name) {
        super(name);
    }

    public void run() {
        startingBarrier.unlock();

        waitingBarrier1.waitFor();
        synchronized (M) { // tc02t001.c::lines[0]
            M.notify();
        }

        waitingBarrier2.waitFor();
        synchronized (M) { // tc02t001.c::lines[1]
            M.notify();
        }

        waitingBarrier3.waitFor();
        synchronized (M) { // tc02t001.c::lines[2]
            M.notify();
        }
    }
}

/* =================================================================== */

public class tc02t001 extends DebugeeClass {

    // run test from command line
    public static void main(String argv[]) {
        argv = nsk.share.jvmti.JVMTITest.commonInit(argv);

        // JCK-compatible exit
        System.exit(run(argv, System.out) + Consts.JCK_STATUS_BASE);
    }

    // run test from JCK-compatible environment
    public static int run(String argv[], PrintStream out) {
        return new tc02t001().runIt(argv, out);
    }

    /* =================================================================== */

    // scaffold objects
    ArgumentHandler argHandler = null;
    Log log = null;
    int status = Consts.TEST_PASSED;
    static long timeout = 0;

    private static volatile int lastEnterEventsCount;
    private static native   int enterEventsCount();

    // tested thread
    tc02t001Thread thread = null;

    static void log (String msg) { System.out.println(msg); }

    private void waitForContendedEnterEvent() {
        try {
            for (int j = 0; j < (timeout / 20); j++) {
                Thread.sleep(20);
                if (enterEventsCount() > lastEnterEventsCount) {
                    log("Got expected MonitorContendedEnter event\n");
                    break;
                }
            }
            if (enterEventsCount() == lastEnterEventsCount) {
                String msg = "Timeout in waiting for a MonitorContendedEnter event";
                throw new RuntimeException(msg);
            }
            thread.M.wait(timeout);
        } catch (InterruptedException e) {
            throw new Failure(e);
        }
    }

    // run debuggee
    public int runIt(String argv[], PrintStream out) {
        argHandler = new ArgumentHandler(argv);
        log = new Log(out, argHandler);
        timeout = argHandler.getWaitTime() * 60 * 1000;
        log.display("Timeout = " + timeout + " msc.");

        thread = new tc02t001Thread("Debuggee Thread");
        synchronized (thread.M) {
            thread.start();
            thread.startingBarrier.waitFor();
            status = checkStatus(status);

            lastEnterEventsCount = enterEventsCount();
            thread.waitingBarrier1.unlock();
            log("Waiting for MonitorEnterEvent #1");
            waitForContendedEnterEvent();

            lastEnterEventsCount = enterEventsCount();
            thread.waitingBarrier2.unlock();
            log("Waiting for MonitorEnterEvent #2");
            waitForContendedEnterEvent();

            lastEnterEventsCount = enterEventsCount();
            thread.waitingBarrier3.unlock();
            log("Waiting for MonitorEnterEvent #3");
            waitForContendedEnterEvent();
        }

        try {
            thread.join(timeout);
        } catch (InterruptedException e) {
            throw new Failure(e);
        }

        log.display("Debugee finished");
        status = checkStatus(status);

        return status;
    }
}