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1 /*
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2 * Copyright 2009 D.E. Shaw. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 /**
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26 * @test
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27 * @bug 6863420
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28 * @summary os::javaTimeNanos() go backward on Solaris x86
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29 *
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30 * @run main/othervm Test
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31 */
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32
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33 public class Test {
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34 static long value = 0;
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35 static boolean got_backward_time = false;
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36
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37 public static void main(String args[]) {
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38 final int count = 100000;
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39
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40 for (int numThreads = 1; numThreads <= 32; numThreads++) {
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41 final int numRuns = 1;
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42 for (int t=1; t <= numRuns; t++) {
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43 final int curRun = t;
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44
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45 System.out.println("Spawning " + numThreads + " threads");
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46 final Thread threads[] = new Thread[numThreads];
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47 for (int i = 0; i < threads.length; i++) {
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48 Runnable thread =
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49 new Runnable() {
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50 public void run() {
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51 for (long l = 0; l < 100000; l++) {
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52 final long start = System.nanoTime();
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53 if (value == 12345678) {
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54 System.out.println("Wow!");
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55 }
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56 final long end = System.nanoTime();
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57 final long time = end - start;
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58 value += time;
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59 if (time < 0) {
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60 System.out.println(
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61 "Backwards: " +
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62 "start=" + start + " " +
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63 "end=" + end + " " +
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64 "time= " + time
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65 );
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66 got_backward_time = true;
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67 }
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68 }
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69 }
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70 };
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71 threads[i] = new Thread(thread, "Thread" + i);
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72 }
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73 for (int i = 0; i < threads.length; i++) {
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74 threads[i].start();
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75 }
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76 for (int i = 0; i < threads.length; i++) {
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77 try {
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78 threads[i].join();
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79 }
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80 catch (InterruptedException e) {
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81 continue;
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82 }
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83 }
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84 }
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85 }
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86
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87 if (got_backward_time) {
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88 System.exit(97);
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89 }
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90 }
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91 }
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