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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 *

 * 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

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 *

 * 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,

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/*

 * @test HandshakeWalkOneExitTest

 * @summary This test tries to stress the handshakes with new and exiting threads

 * @library /testlibrary /test/lib

 * @build HandshakeWalkOneExitTest

 * @run driver ClassFileInstaller sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI HandshakeWalkOneExitTest

 */

import jdk.test.lib.Asserts;

import sun.hotspot.WhiteBox;

public class HandshakeWalkOneExitTest  implements Runnable {

    @Override

    public void run() {

    }

    static volatile boolean exit_now = false;

    static Thread[] threads;

    public static void main(String... args) throws Exception {

        int testRuns = 20;

        int testThreads = 128;

        HandshakeWalkOneExitTest test = new HandshakeWalkOneExitTest();

        Runnable hser = new Runnable(){

            public void run(){

                WhiteBox wb = WhiteBox.getWhiteBox();

                while(!exit_now) {

                    Thread[] t = threads;

                    for (int i = 0; i<t.length ; i++) {

                        wb.handshakeWalkStack(t[i], false);

                    }

                }

            }

        };

        Thread hst = new Thread(hser);

        for (int k = 0; k<testRuns ; k++) {

            threads = new Thread[testThreads];

            for (int i = 0; i<threads.length ; i++) {

                threads[i] = new Thread(test);

                threads[i].start();

            }

            if (k == 0) {

                hst.start();

            }

        }

        exit_now = true;

        hst.join();

    }

}