File: watchthreads.c

package info (click to toggle)
binutils-avr 2.26.20160125%2BAtmel3.6.1-4
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 365,520 kB
  • sloc: ansic: 2,480,046; asm: 892,791; exp: 188,218; cpp: 133,829; makefile: 63,887; sh: 32,194; yacc: 26,783; lisp: 16,707; xml: 7,490; perl: 6,449; python: 4,555; ada: 4,318; pascal: 3,174; lex: 2,250; cs: 879; sed: 334; f90: 298; awk: 168; objc: 134; java: 73; fortran: 43
file content (79 lines) | stat: -rw-r--r-- 2,065 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
/* This testcase is part of GDB, the GNU debugger.

   Copyright 2002-2015 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program 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 for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
   This file is copied from schedlock.c.  */

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>

void *thread_function (void *arg); /* Function executed by each thread.  */

#define NUM 5

unsigned int args[NUM+1];

int
main ()
{
    int res;
    pthread_t threads[NUM];
    void *thread_result;
    long i;

    /* To keep the test determinative, initialize args first,
       then start all the threads.  Otherwise, the way watchthreads.exp
       is written, we have to worry about things like threads[0] getting
       to 29 hits of args[0] before args[1] gets changed.  */

    for (i = 0; i < NUM; i++)
      {
	/* The call to usleep is so that when the watchpoint triggers,
	   the pc is still on the same line.  */
	args[i] = 1; usleep (1); /* Init value.  */
      }

    for (i = 0; i < NUM; i++)
      {
	res = pthread_create (&threads[i],
			      NULL,
			      thread_function,
			      (void *) i);
      }

    args[i] = 1;
    thread_function ((void *) i);

    exit (EXIT_SUCCESS);
}

void *
thread_function (void *arg)
{
    int my_number =  (long) arg;
    int *myp = (int *) &args[my_number];

    /* Don't run forever.  Run just short of it :)  */
    while (*myp > 0)
      {
	(*myp) ++; usleep (1);  /* Loop increment.  */
      }

    pthread_exit (NULL);
}