1 /*
   2  * Copyright (c) 2007, 2012, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.jtt.jdk;
  24 
  25 import org.junit.Test;
  26 
  27 import org.graalvm.compiler.jtt.JTTTest;
  28 
  29 /*
  30  */
  31 public class System_currentTimeMillis02 extends JTTTest {
  32 
  33     static void m(long[] times) {
  34         times[1] = System.currentTimeMillis() - times[0];
  35     }
  36 
  37     public static boolean test() {
  38         long[] times = new long[2];  // { start, delta }
  39         times[0] = System.currentTimeMillis();
  40         times[1] = 0;
  41         // force compilation:
  42         for (int i = 0; i < 5000; i++) {
  43             m(times);
  44         }
  45         times[0] = System.currentTimeMillis();
  46         times[1] = 0;
  47         for (int i = 0; times[1] == 0 && i < 5000000; i++) {
  48             m(times);
  49             // do nothing.
  50         }
  51         // better get at least 100 millisecond resolution.
  52         return times[1] >= 1 && times[1] < 100;
  53     }
  54 
  55     @Test
  56     public void run0() throws Throwable {
  57         runTest("test");
  58     }
  59 
  60 }