source: trunk/openjdk/hotspot/test/compiler/6863420/Test.java

/*
 * Copyright 2009 D.E. Shaw.  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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

/**
 * @test
 * @bug 6863420
 * @summary os::javaTimeNanos() go backward on Solaris x86
 *
 * @run main/othervm Test
 */

public class Test {
    static long value = 0;
    static boolean got_backward_time = false;

    public static void main(String args[]) {
        final int count = 100000;

        for (int numThreads = 1; numThreads <= 32; numThreads++) {
            final int numRuns = 1;
            for (int t=1; t <= numRuns; t++) {
                final int curRun = t;

                System.out.println("Spawning " + numThreads + " threads");
                final Thread threads[] = new Thread[numThreads];
                for (int i = 0; i < threads.length; i++) {
                    Runnable thread =
                        new Runnable() {
                            public void run() {
                                for (long l = 0; l < 100000; l++) {
                                    final long start = System.nanoTime();
                                    if (value == 12345678) {
                                        System.out.println("Wow!");
                                    }
                                    final long end = System.nanoTime();
                                    final long time = end - start;
                                    value += time;
                                    if (time < 0) {
                                        System.out.println(
                                            "Backwards: " +
                                            "start=" + start + " " +
                                            "end=" + end + " " +
                                            "time= " + time
                                        );
                                        got_backward_time = true;
                                    }
                                }
                            }
                        };
                    threads[i] = new Thread(thread, "Thread" + i);
                }
                for (int i = 0; i < threads.length; i++) {
                    threads[i].start();
                }
                for (int i = 0; i < threads.length; i++) {
                    try {
                        threads[i].join();
                    }
                    catch (InterruptedException e) {
                        continue;
                    }
                }
            }
        }

        if (got_backward_time) {
            System.exit(97);
        }
    }
}