gdb/testsuite/gdb.base/watch_thread_num.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2002-2015 Free Software Foundation, Inc.
   4
   5    Copyright 1992, 1993, 1994, 1995, 1999, 2002, 2003, 2007, 2008, 2009
   6    Free Software Foundation, Inc.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21    This file is copied from schedlock.c.  */
  22
  23 #include <stdio.h>
  24 #include <unistd.h>
  25 #include <stdlib.h>
  26 #include <pthread.h>
  27
  28 void *thread_function (void *arg); /* Pointer to function executed by each thread */
  29
  30 #define NUM 5
  31
  32 static unsigned int shared_var = 1;
  33
  34 int main () {
  35     int res;
  36     pthread_t threads[NUM];
  37     void *thread_result;
  38     long i;
  39
  40     for (i = 0; i < NUM; i++)
  41       {
  42         res = pthread_create (&threads[i],
  43                              NULL,
  44                              thread_function,
  45                              (void *) i);
  46       }
  47
  48     thread_result = thread_function ((void *) i);
  49
  50     exit (EXIT_SUCCESS);
  51 }
  52
  53 void *thread_function (void *arg) {
  54     int my_number = (long) arg;
  55     /* Don't run forever.  Run just short of it :)  */
  56     while (shared_var > 0)
  57       {
  58         shared_var++;
  59         usleep (1); /* Loop increment.  */
  60       }
  61
  62     pthread_exit (NULL);
  63 }
  64