1 /*
2  * Copyright 2009 D.E. Shaw.  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  *
23  */
24 
25 /**
26  * @test
27  * @bug 6863420
28  * @summary os::javaTimeNanos() go backward on Solaris x86
29  *
30  * @run main/othervm/timeout=300 compiler.runtime.Test6863420
31  */
32 /*
33  * Notice the internal timeout in timeout thread Test6863420.TOT.
34  */
35 
36 package compiler.runtime;
37 
38 public class Test6863420 {
39 
40     static final int INTERNAL_TIMEOUT=240;
41     static class TOT extends Thread {
run()42        public void run() {
43            try {
44                Thread.sleep(INTERNAL_TIMEOUT*1000);
45            } catch (InterruptedException ex) {
46            }
47            done = true;
48        }
49     }
50 
51     static long value = 0;
52     static boolean got_backward_time = false;
53     static volatile boolean done = false;
54 
main(String args[])55     public static void main(String args[]) {
56         final int count = 100000;
57 
58         TOT tot = new TOT();
59         tot.setDaemon(true);
60         tot.start();
61 
62         for (int numThreads = 1; !done && numThreads <= 32; numThreads++) {
63             final int numRuns = 1;
64             for (int t=1; t <= numRuns; t++) {
65                 final int curRun = t;
66 
67                 System.out.println("Spawning " + numThreads + " threads");
68                 final Thread threads[] = new Thread[numThreads];
69                 for (int i = 0; i < threads.length; i++) {
70                     Runnable thread =
71                         new Runnable() {
72                             public void run() {
73                                 for (long l = 0; !done && l < 100000; l++) {
74                                     final long start = System.nanoTime();
75                                     if (value == 12345678) {
76                                         System.out.println("Wow!");
77                                     }
78                                     final long end = System.nanoTime();
79                                     final long time = end - start;
80                                     value += time;
81                                     if (time < 0) {
82                                         System.out.println(
83                                             "Backwards: " +
84                                             "start=" + start + " " +
85                                             "end=" + end + " " +
86                                             "time= " + time
87                                         );
88                                         got_backward_time = true;
89                                     }
90                                 }
91                             }
92                         };
93                     threads[i] = new Thread(thread, "Thread" + i);
94                 }
95                 for (int i = 0; i < threads.length; i++) {
96                     threads[i].start();
97                 }
98                 for (int i = 0; i < threads.length; i++) {
99                     try {
100                         threads[i].join();
101                     }
102                     catch (InterruptedException e) {
103                         continue;
104                     }
105                 }
106             }
107         }
108 
109         if (got_backward_time) {
110             System.exit(97);
111         }
112     }
113 }
114