001/*
002 * Copyright (c) 2007, 2012, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.jtt.jdk;
024
025import org.junit.*;
026
027import com.oracle.graal.jtt.*;
028
029/*
030 */
031public class System_currentTimeMillis02 extends JTTTest {
032
033    static void m(long[] times) {
034        times[1] = System.currentTimeMillis() - times[0];
035    }
036
037    public static boolean test() {
038        long[] times = new long[2];  // { start, delta }
039        times[0] = System.currentTimeMillis();
040        times[1] = 0;
041        // force compilation:
042        for (int i = 0; i < 5000; i++) {
043            m(times);
044        }
045        times[0] = System.currentTimeMillis();
046        times[1] = 0;
047        for (int i = 0; times[1] == 0 && i < 5000000; i++) {
048            m(times);
049            // do nothing.
050        }
051        // better get at least 100 millisecond resolution.
052        return times[1] >= 1 && times[1] < 100;
053    }
054
055    @Test
056    public void run0() throws Throwable {
057        runTest("test");
058    }
059
060}