/*

 * Copyright (c) 2004, 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.jvmti.scenarios.contention.TC03;

import java.io.PrintStream;

import nsk.share.*;

import nsk.share.jvmti.*;

public class tc03t001 extends DebugeeClass {

    final static int WAIT_TIME = 100;

    // 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 tc03t001().runIt(argv, out);

    }

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

    // scaffold objects

    ArgumentHandler argHandler = null;

    static Log log = null;

    int status = Consts.TEST_PASSED;

    long timeout = 0;

    // 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.");

        long MAX_LOOP = timeout / WAIT_TIME;

        String A = "A";

        String B = "B";

        tc03t001Thread threadAB = new tc03t001Thread(A, B);

        tc03t001Thread threadBA = new tc03t001Thread(B, A);

        threadAB.start();

        threadBA.start();

        int v1 = 0;

        int v2 = 0;

        int v3 = 0;

        int v4 = 0;

        int old_v1 = 0;

        int old_v2 = 0;

        int old_v3 = 0;

        int old_v4 = 0;

        for (long i = 0; i < MAX_LOOP; ++i) {

            v1 = threadAB.getLock1Counter();

            v2 = threadAB.getLock2Counter();

            v3 = threadBA.getLock1Counter();

            v4 = threadBA.getLock2Counter();

            log.display("Iteration " + i);

            log.display("    threadAB: lock1Counter = " + v1 +

                        ", lock2Counter = " + v2);

            log.display("    threadBA: lock1Counter = " + v3 +

                        ", lock2Counter = " + v4);

            // break loop if threads are making no more progress

            if ((v1 + v2 + v3 + v4 > 0)

                    && (v1 == old_v1)

                    && (v2 == old_v2)

                    && (v3 == old_v3)

                    && (v4 == old_v4)) {

                return checkStatus(status);

            } else {

                old_v1 = v1;

                old_v2 = v2;

                old_v3 = v3;

                old_v4 = v4;

            }

            // wait a bit before checking again

            try {

                Thread.sleep(WAIT_TIME);

                Thread.sleep(WAIT_TIME);

            } catch (InterruptedException e) {

                e.printStackTrace();

            }

        }

        log.display("Debugee timed out waiting deadlock");

        return status;

    }

}

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

class tc03t001Thread extends Thread {

    Object lock1;

    Object lock2;

    int lock1Counter = 0;

    int lock2Counter = 0;

    public tc03t001Thread(Object o1, Object o2) {

        super("Debuggee Thread " + o1 + o2);

        lock1 = o1;

        lock2 = o2;

    }

    public void run() {

        tc03t001.log.display("Started " + this);

        while (true) {

            synchronized (lock1) {

                ++lock1Counter;

                synchronized (lock2) {

                    ++lock2Counter;

                }

            }

        }

    }

    public int getLock1Counter() {

        return lock1Counter;

    }

    public int getLock2Counter() {

        return lock2Counter;

    }

}