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, 2009, 2010, 2011
   4    Free Software Foundation, Inc.
   5
   6    Copyright 1992, 1993, 1994, 1995, 1999, 2002, 2003, 2007, 2008, 2009
   7    Free Software Foundation, Inc.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21
  22    This file is copied from schedlock.c.  */
  23
  24 #include <stdio.h>
  25 #include <unistd.h>
  26 #include <stdlib.h>
  27 #include <pthread.h>
  28
  29 void *thread_function (void *arg); /* Pointer to function executed by each thread */
  30
  31 #define NUM 5
  32
  33 static unsigned int shared_var = 1;
  34
  35 int main () {
  36     int res;
  37     pthread_t threads[NUM];
  38     void *thread_result;
  39     long i;
  40
  41     for (i = 0; i < NUM; i++)
  42       {
  43         res = pthread_create (&threads[i],
  44                              NULL,
  45                              thread_function,
  46                              (void *) i);
  47       }
  48
  49     thread_result = thread_function ((void *) i);
  50
  51     exit (EXIT_SUCCESS);
  52 }
  53
  54 void *thread_function (void *arg) {
  55     int my_number = (long) arg;
  56     /* Don't run forever.  Run just short of it :)  */
  57     while (shared_var > 0)
  58       {
  59         shared_var++;
  60         usleep (1); /* Loop increment.  */
  61       }
  62
  63     pthread_exit (NULL);
  64 }
  65