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 can disable events for a given thread. 31 * @compile HeapMonitorThreadDisabledTest.java 32 * @run main/othervm/native -Xmx512m -agentlib:HeapMonitorTest MyPackage.HeapMonitorThreadDisabledTest 33 * @requires !vm.gc.Z 34 */ 35 36 import java.util.List; 37 38 public class HeapMonitorThreadDisabledTest { 39 private native static void enableSamplingEvents(Thread thread); 40 private native static boolean checkThreadSamplesOnlyFrom(Thread thread); 41 42 public static void main(String[] args) { 43 final int numThreads = 4; 44 List<ThreadInformation> threadList = ThreadInformation.createThreadList(numThreads); 45 46 // Sample at a interval of 8k. 47 HeapMonitor.setSamplingInterval(1 << 13); 48 49 // Only enable the sampling for a given thread. 50 Thread thread = threadList.get(0).getThread(); 51 enableSamplingEvents(thread); 52 53 System.err.println("Starting threads"); 54 ThreadInformation.startThreads(threadList); 55 ThreadInformation.waitForThreads(threadList); 56 System.err.println("Waited for threads"); 57 58 // Only have the samples for a given thread should be captured. 59 if (!checkThreadSamplesOnlyFrom(thread)) { 60 throw new RuntimeException( 61 "Problem with checkSamples: got no events from the expected thread"); 62 } 63 64 // Now inform each thread we are done and wait for them to be done. 65 ThreadInformation.stopThreads(threadList); 66 } 67 }