1 /*

     2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

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

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 

    25 /*

    26  * @test HandshakeWalkExitTest

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

    28  * @library /testlibrary /test/lib

    29  * @build HandshakeWalkExitTest

    30  * @run main ClassFileInstaller sun.hotspot.WhiteBox

    31  *                              sun.hotspot.WhiteBox$WhiteBoxPermission

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

    33  */

    34 

    35 import jdk.test.lib.Asserts;

    36 import sun.hotspot.WhiteBox;

    37 

    38 public class HandshakeWalkExitTest  implements Runnable {

    39 

    40     @Override

    41     public void run() {

    42     }

    43 

    44     static volatile boolean exit_now = false;

    45     static Thread[] threads;

    46 

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

    48         int testRuns = 100;

    49         int testThreads = 500;

    50 

    51         HandshakeWalkExitTest test = new HandshakeWalkExitTest();

    52 

    53         threads = new Thread[64];

    54 

    55         Runnable hser = new Runnable(){

    56             public void run(){

    57                 WhiteBox wb = WhiteBox.getWhiteBox();

    58                 while(!exit_now) {

    59                     wb.handshakeWalkStack(null, true);

    60                     try { Thread.sleep(1); } catch(Exception e) {}

    61                 }

    62             }

    63         };

    64         Thread hst = new Thread(hser);

    65         hst.start();

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

    67             Thread[] threads = new Thread[testThreads];

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

    69                 threads[i] = new Thread(test);

    70                 threads[i].start();

    71             }

    72         }

    73         exit_now = true;

    74         hst.join();

    75     }

    76 }