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