test/hotspot/jtreg/serviceability/jvmti/HeapMonitor/MyPackage/HeapMonitorThreadTest.java

/*
 * Copyright (c) 2018, Google and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package MyPackage;

/**
 * @test
 * @build Frame HeapMonitor ThreadInformation
 * @summary Verifies the JVMTI Heap Monitor Thread information sanity.
 * @compile HeapMonitorThreadTest.java
 * @run main/othervm/native -Xmx512m -agentlib:HeapMonitorTest MyPackage.HeapMonitorThreadTest
 */

import java.util.List;

public class HeapMonitorThreadTest {
  private native static boolean checkSamples(int numThreads);

  public static void main(String[] args) {
    final int numThreads = 5;
    List<ThreadInformation> threadList = ThreadInformation.createThreadList(numThreads);

    // Sample at a interval of 8k.
    HeapMonitor.setSamplingInterval(1 << 13);
    HeapMonitor.enableSamplingEvents();

    System.err.println("Starting threads");
    ThreadInformation.startThreads(threadList);
    ThreadInformation.waitForThreads(threadList);
    System.err.println("Waited for threads");

    if (!checkSamples(numThreads)) {
      throw new RuntimeException("Problem with checkSamples...");
    }

    // Now inform each thread we are done and wait for them to be done.
    ThreadInformation.stopThreads(threadList);
  }
}