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 }