gdb/testsuite/gdb.base/watch_thread_num.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2002, 2003, 2004, 2007, 2008 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 static unsigned int shared_var = 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         res = pthread_create (&threads[i],
  42                              NULL,
  43                              thread_function,
  44                              (void *) i);
  45       }
  46
  47     thread_result = thread_function ((void *) i);
  48
  49     exit (EXIT_SUCCESS);
  50 }
  51
  52 void *thread_function (void *arg) {
  53     int my_number = (long) arg;
  54     /* Don't run forever.  Run just short of it :)  */
  55     while (shared_var > 0)
  56       {
  57         shared_var++;
  58         usleep (1); /* Loop increment.  */
  59       }
  60
  61     pthread_exit (NULL);
  62 }
  63