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_nanoTime02 extends JTTTest {
032
033    public static boolean test() {
034        long minDelta = Long.MAX_VALUE;
035
036        // the first call to System.nanoTime might take a long time due to call resolution
037        for (int c = 0; c < 10; c++) {
038            long start = System.nanoTime();
039            long delta = 0;
040            int i;
041            for (i = 0; delta == 0 && i < 50000; i++) {
042                delta = System.nanoTime() - start;
043                // do nothing.
044            }
045            if (delta < minDelta) {
046                minDelta = delta;
047            }
048        }
049
050        // better get at least 30 microsecond resolution.
051        return minDelta > 1 && minDelta < 30000;
052    }
053
054    @Test
055    public void run0() throws Throwable {
056        runTest("test");
057    }
058
059}