System_currentTimeMillis02.java revision 12651:6ef01bd40ce2 
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 */
23package org.graalvm.compiler.jtt.jdk;
24
25import org.junit.Test;
26
27import org.graalvm.compiler.jtt.JTTTest;
28
29/*
30 */
31public 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}
61