1 /*
   2  * Copyright (c) 2007, 2019, 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 
  24 
  25 package org.graalvm.compiler.jtt.jdk;
  26 
  27 import org.graalvm.compiler.api.directives.GraalDirectives;
  28 import org.graalvm.compiler.jtt.JTTTest;
  29 import org.junit.Test;
  30 
  31 /**
  32  * Checks that the time between 2 successive calls to {@link System#currentTimeMillis()} is less
  33  * than 100 milliseconds at least once in 5_000_000 attempts.
  34  */
  35 public class System_currentTimeMillis02 extends JTTTest {
  36 
  37     public static boolean test() {
  38         for (int i = 0; i < 5_000_000; i++) {
  39             long elapsed = System.currentTimeMillis() - System.currentTimeMillis();
  40             if (elapsed < 100) {
  41                 return true;
  42             }
  43         }
  44         if (!GraalDirectives.inCompiledCode()) {
  45             // We don't care about the result for the interpreter, C1 or C2
  46             return true;
  47         }
  48         return false;
  49     }
  50 
  51     @Test
  52     public void run0() throws Throwable {
  53         runTest("test");
  54     }
  55 
  56 }