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 }