gdb/testsuite/gdb.threads/watchthreads.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2002, 2003, 2004, 2007, 2008, 2009 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 3 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, see <http://www.gnu.org/licenses/>.
  17
  18    This file is copied from schedlock.c.  */
  19
  20 #include <stdio.h>
  21 #include <unistd.h>
  22 #include <stdlib.h>
  23 #include <pthread.h>
  24
  25 void *thread_function(void *arg); /* Pointer to function executed by each thread */
  26
  27 #define NUM 5
  28
  29 unsigned int args[NUM+1];
  30
  31 int main() {
  32     int res;
  33     pthread_t threads[NUM];
  34     void *thread_result;
  35     long i;
  36
  37     for (i = 0; i < NUM; i++)
  38       {
  39         args[i] = 1; /* Init value.  */
  40         res = pthread_create(&threads[i],
  41                              NULL,
  42                              thread_function,
  43                              (void *) i);
  44       }
  45
  46     args[i] = 1;
  47     thread_function ((void *) i);
  48
  49     exit(EXIT_SUCCESS);
  50 }
  51
  52 void *thread_function(void *arg) {
  53     int my_number =  (long) arg;
  54     int *myp = (int *) &args[my_number];
  55
  56     /* Don't run forever.  Run just short of it :)  */
  57     while (*myp > 0)
  58       {
  59         (*myp) ++; usleep (1);  /* Loop increment.  */
  60       }
  61
  62     pthread_exit(NULL);
  63 }
  64