1 /*
   2  * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2020, NTT DATA.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  */
  24 
  25 /**
  26  * @test
  27  * @bug 8242428
  28  * @summary Verifies JVMTI GetThreadListStackTraces API with thread_count = 1
  29  * @library /test/lib
  30  * @run main/othervm/native -agentlib:OneGetThreadListStackTraces OneGetThreadListStackTraces
  31  *
  32  */
  33 
  34 public class OneGetThreadListStackTraces implements Runnable {
  35 
  36     private Object lock;
  37 
  38     public OneGetThreadListStackTraces(Object lock) {
  39         this.lock = lock;
  40     }
  41 
  42     private static native void checkCallStacks(Thread thread);
  43 
  44     @Override
  45     public void run() {
  46       try {
  47           synchronized (lock) {
  48               lock.wait();
  49               System.out.println("OK");
  50           }
  51       } catch (Exception e) {
  52           throw new RuntimeException(e);
  53       }
  54     }
  55 
  56     public static void main(String[] args) throws Exception {
  57         Object lockObj = new Object();
  58         Thread th = new Thread(new OneGetThreadListStackTraces(lockObj), "test thread");
  59         th.start();
  60 
  61         /* Wait until the thread state transits to "waiting" */
  62         while (th.getState() != Thread.State.WAITING) {
  63             Thread.onSpinWait();
  64         }
  65 
  66         checkCallStacks(th);
  67 
  68         synchronized (lockObj) {
  69             lockObj.notify();
  70         }
  71     }
  72 }