gdb/testsuite/gdb.threads/watchthreads.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2002, 2003, 2004 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software
  17    Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.
  19
  20    This file is copied from schedlock.c.  */
  21
  22 #include <stdio.h>
  23 #include <unistd.h>
  24 #include <stdlib.h>
  25 #include <pthread.h>
  26
  27 void *thread_function(void *arg); /* Pointer to function executed by each thread */
  28
  29 #define NUM 5
  30
  31 unsigned int args[NUM+1];
  32
  33 int main() {
  34     int res;
  35     pthread_t threads[NUM];
  36     void *thread_result;
  37     long i;
  38
  39     for (i = 0; i < NUM; i++)
  40       {
  41         args[i] = 1; /* Init value.  */
  42         res = pthread_create(&threads[i],
  43                              NULL,
  44                              thread_function,
  45                              (void *) i);
  46       }
  47
  48     args[i] = 1;
  49     thread_function ((void *) i);
  50
  51     exit(EXIT_SUCCESS);
  52 }
  53
  54 void *thread_function(void *arg) {
  55     int my_number =  (long) arg;
  56     int *myp = (int *) &args[my_number];
  57
  58     /* Don't run forever.  Run just short of it :)  */
  59     while (*myp > 0)
  60       {
  61         (*myp) ++;  /* Loop increment.  */
  62       }
  63
  64     pthread_exit(NULL);
  65 }
  66