| |
| /* |
| * Copyright (c) 2018, Oracle 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. |
| */ |
| |
| import jdk.test.lib.apps.LingeredApp; |
| |
| public class LingeredAppWithNativeMethod extends LingeredApp { |
| |
| public static final String THREAD_NAME = "NoFramePointerJNIFib"; |
| private static final int UPPER_BOUND = 55; |
| private static final int LOWER_BOUND = 40; |
| |
| static { |
| // JNI library compiled with no frame pointer info |
| System.loadLibrary("NoFramePointer"); |
| } |
| |
| public void callNative() { |
| // Call JNI code which does something compute |
| // intensive: fibonacci |
| // That is to ensure that the native bits run when |
| // jstack --mixed info is to be gathered. |
| // Results of fibonacci calculation from JNI are |
| // reported via callback(). That's where the process |
| // of calculating fibonacci restarts. |
| int num = (int) (Math.random() * UPPER_BOUND); |
| while (num < LOWER_BOUND) { |
| num = (int) (Math.random() * UPPER_BOUND); |
| } |
| System.out.print("fib(" + num + ") = "); |
| callJNI(this, num); |
| } |
| |
| // Called from JNI library libNoFramePointer |
| private void callback(long val) { |
| System.out.println(val); |
| // Call native again so as to increase chances of |
| // being currently in JNI code when jstack --mixed |
| // runs. |
| callNative(); |
| } |
| |
| public static native void callJNI(Object target, int num); |
| |
| public static void main(String[] args) { |
| LingeredAppWithNativeMethod app = new LingeredAppWithNativeMethod(); |
| Thread fibonacci = new Thread(() -> { |
| app.callNative(); |
| }); |
| fibonacci.setName(THREAD_NAME); |
| fibonacci.start(); |
| LingeredApp.main(args); |
| } |
| } |