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 import java.util.concurrent.CountDownLatch;
  26 
  27 /**
  28  * @test
  29  * @bug 8242428
  30  * @summary Verifies JVMTI GetThreadListStackTraces API with thread_count = 1
  31  * @library /test/lib
  32  * @run main/othervm/native -agentlib:OneGetThreadListStackTraces OneGetThreadListStackTraces
  33  *
  34  */
  35 
  36 public class OneGetThreadListStackTraces implements Runnable {
  37 
  38     private CountDownLatch startSignal;
  39     private CountDownLatch stopSignal;
  40 
  41     public OneGetThreadListStackTraces(CountDownLatch startSignal, CountDownLatch stopSignal) {
  42         this.startSignal = startSignal;
  43         this.stopSignal = stopSignal;
  44     }
  45 
  46     private static native void checkCallStacks(Thread thread);
  47 
  48     @Override
  49     public void run() {
  50         startSignal.countDown();
  51         try {
  52             stopSignal.await();
  53         } catch (Exception e) {
  54             throw new RuntimeException(e);
  55         }
  56     }
  57 
  58     public static void main(String[] args) throws Exception {
  59         CountDownLatch startSignal = new CountDownLatch(1);
  60         CountDownLatch stopSignal = new CountDownLatch(1);
  61         Thread th = new Thread(new OneGetThreadListStackTraces(startSignal, stopSignal), "test thread");
  62         th.start();
  63 
  64         startSignal.countDown();
  65 
  66         /* Check call stack of "test thread" in native */
  67         checkCallStacks(th);
  68 
  69         stopSignal.countDown();
  70         th.join();
  71     }
  72 }