1 /*
   2  * Copyright (c) 2018, Google 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 package MyPackage;
  25 
  26 /**
  27  * @test
  28  * @build Frame HeapMonitor ThreadInformation
  29  * @summary Verifies the JVMTI Heap Monitor Thread information sanity.
  30  * @compile HeapMonitorThreadTest.java
  31  * @run main/othervm/native -agentlib:HeapMonitorTest MyPackage.HeapMonitorThreadTest
  32  */
  33 
  34 import java.util.List;
  35 
  36 public class HeapMonitorThreadTest {
  37   private native static boolean checkSamples(int numThreads);
  38 
  39   public static void main(String[] args) {
  40     final int numThreads = 24;
  41     List<ThreadInformation> threadList = ThreadInformation.createThreadList(numThreads);
  42 
  43     // Sample at a rate of 8k.
  44     HeapMonitor.setSamplingRate(1 << 13);
  45     HeapMonitor.enableSamplingEvents();
  46 
  47     System.err.println("Starting threads");
  48     ThreadInformation.startThreads(threadList);
  49     ThreadInformation.waitForThreads(threadList);
  50     System.err.println("Waited for threads");
  51 
  52     if (!checkSamples(numThreads)) {
  53       throw new RuntimeException("Problem with checkSamples...");
  54     }
  55 
  56     // Now inform each thread we are done and wait for them to be done.
  57     ThreadInformation.stopThreads(threadList);
  58   }
  59 }