gdb/testsuite/gdb.threads/tls-so_extern_main.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2015-2016 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 #include <pthread.h>
  19
  20 extern __thread void *so_extern;
  21 extern __thread void *so_extern2;
  22
  23 static void *
  24 tls_ptr (void *p)
  25 {
  26    so_extern = &so_extern;
  27    so_extern2 = &so_extern2; /* break here to check result */
  28 }
  29
  30 int
  31 main (void)
  32 {
  33    pthread_t threads[2];
  34
  35    tls_ptr (NULL);
  36
  37    pthread_create (&threads[0], NULL, tls_ptr, NULL);
  38    pthread_create (&threads[1], NULL, tls_ptr, NULL);
  39
  40    pthread_join (threads[0], NULL);
  41    pthread_join (threads[1], NULL);
  42
  43    tls_ptr (NULL);
  44
  45    return 0;
  46 }
  47