tests/test-call_once.c

   1 /* Test of once-only execution in multithreaded situations.
   2    Copyright (C) 2018-2020 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2018.  */
  18
  19 #include <config.h>
  20
  21 #include <threads.h>
  22
  23 #include "macros.h"
  24
  25 static once_flag a_once = ONCE_FLAG_INIT;
  26
  27 static int a;
  28
  29 static void
  30 a_init (void)
  31 {
  32   a = 42;
  33 }
  34
  35 int
  36 main ()
  37 {
  38   call_once (&a_once, a_init);
  39
  40   ASSERT (a == 42);
  41
  42   return 0;
  43 }