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_nanoTime02 extends JTTTest {
32
33    public static boolean test() {
34        long minDelta = Long.MAX_VALUE;
35
36        // the first call to System.nanoTime might take a long time due to call resolution
37        for (int c = 0; c < 10; c++) {
38            long start = System.nanoTime();
39            long delta = 0;
40            int i;
41            for (i = 0; delta == 0 && i < 50000; i++) {
42                delta = System.nanoTime() - start;
43                // do nothing.
44            }
45            if (delta < minDelta) {
46                minDelta = delta;
47            }
48        }
49
50        // better get at least 30 microsecond resolution.
51        return minDelta > 1 && minDelta < 30000;
52    }
53
54    @Test
55    public void run0() throws Throwable {
56        runTest("test");
57    }
58
59}
60