/*
 * Copyright (c) 2007, 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package org.graalvm.compiler.jtt.jdk;

import org.graalvm.compiler.api.directives.GraalDirectives;
import org.graalvm.compiler.jtt.JTTTest;
import org.junit.Test;

/**
 * Checks that the time between 2 successive calls to {@link System#nanoTime()} is less than 30
 * microseconds at least once in 5_000_000 attempts.
 */
public class System_nanoTime02 extends JTTTest {

    public static boolean test() {
        for (int i = 0; i < 5_000_000; i++) {
            long delta = System.nanoTime() - System.nanoTime();
            if (delta < 30_000) {
                return true;
            }
        }
        if (!GraalDirectives.inCompiledCode()) {
            // We don't care about the result for the interpreter, C1 or C2
            return true;
        }
        return false;
    }

    @Test
    public void run0() throws Throwable {
        runTest("test");
    }
}