gdb/testsuite/gdb.threads/staticthreads.c

   1 /* This test program is part of GDB, The GNU debugger.
   2
   3    Copyright 2004-2021 Free Software Foundation, Inc.
   4
   5    Originally written by Jeff Johnston <jjohnstn@redhat.com>,
   6    contributed by Red Hat
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include <pthread.h>
  24 #include <semaphore.h>
  25 #include <stdio.h>
  26 #include <limits.h>
  27 #include <errno.h>
  28
  29 sem_t semaphore;
  30
  31 #ifdef HAVE_TLS
  32 __thread int tlsvar;
  33 #endif
  34
  35 void *
  36 thread_function (void *arg)
  37 {
  38 #ifdef HAVE_TLS
  39   tlsvar = 2;
  40 #endif
  41   while (sem_wait (&semaphore) != 0)
  42     {
  43       if (errno != EINTR)
  44         {
  45           perror ("thread_function");
  46           return NULL;
  47         }
  48     }
  49   printf ("Thread executing\n"); /* tlsvar-is-set */
  50   return NULL;
  51 }
  52
  53 int
  54 main (int argc, char **argv)
  55 {
  56   pthread_attr_t attr;
  57
  58   pthread_attr_init (&attr);
  59   pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN);
  60
  61   if (sem_init (&semaphore, 0, 0) == -1)
  62     {
  63       perror ("semaphore");
  64       return -1;
  65     }
  66
  67 #ifdef HAVE_TLS
  68   tlsvar = 1;
  69 #endif
  70
  71   /* Create a thread, wait for it to complete.  */
  72   {
  73     pthread_t thread;
  74     pthread_create (&thread, &attr, thread_function, NULL);
  75     sem_post (&semaphore);
  76     pthread_join (thread, NULL);
  77   }
  78
  79   pthread_attr_destroy (&attr);
  80   return 0;
  81 }