1 /* 2 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2018, Google and/or its affiliates. All rights reserved. 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 package MyPackage; 26 27 /** 28 * @test 29 * @build Frame HeapMonitor ThreadInformation 30 * @summary Verifies the JVMTI Heap Monitor Thread information sanity. 31 * @compile HeapMonitorThreadTest.java 32 * @run main/othervm/native -Xmx512m -agentlib:HeapMonitorTest MyPackage.HeapMonitorThreadTest 33 */ 34 35 import java.util.List; 36 37 public class HeapMonitorThreadTest { checkSamples(int numThreads)38 private native static boolean checkSamples(int numThreads); 39 main(String[] args)40 public static void main(String[] args) { 41 final int numThreads = 5; 42 List<ThreadInformation> threadList = ThreadInformation.createThreadList(numThreads); 43 44 // Sample at a interval of 8k. 45 HeapMonitor.setSamplingInterval(1 << 13); 46 HeapMonitor.enableSamplingEvents(); 47 48 System.err.println("Starting threads"); 49 ThreadInformation.startThreads(threadList); 50 ThreadInformation.waitForThreads(threadList); 51 System.err.println("Waited for threads"); 52 53 if (!checkSamples(numThreads)) { 54 throw new RuntimeException("Problem with checkSamples..."); 55 } 56 57 // Now inform each thread we are done and wait for them to be done. 58 ThreadInformation.stopThreads(threadList); 59 } 60 } 61