1 /*
   2  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.jfr.jvm;
  27 
  28 import static jdk.test.lib.Asserts.assertGreaterThan;
  29 
  30 import jdk.jfr.internal.JVM;
  31 
  32 /**
  33  * @test TestCounterTime
  34  * @key jfr
  35  *
  36  * @library /lib /
  37  *
  38  * @run main/othervm jdk.jfr.jvm.TestCounterTime
  39  */
  40 public class TestCounterTime {
  41 
  42     public static void main(String... args) throws InterruptedException {
  43         // Not enabled
  44         assertCounterTime();
  45 
  46         JVM jvm = JVM.getJVM();
  47         jvm.createNativeJFR();
  48         assertCounterTime();
  49         // Enabled
  50         jvm.destroyNativeJFR();
  51     }
  52 
  53     private static void assertCounterTime() throws InterruptedException {
  54         long time1 = JVM.counterTime();
  55         assertGreaterThan(time1, 0L, "Counter time can't be negative.");
  56 
  57         Thread.sleep(1);
  58 
  59         long time2 = JVM.counterTime();
  60         assertGreaterThan(time2, time1, "Counter time must be increasing.");
  61     }
  62 }