1  /* Test of once-only execution in multithreaded situations.
       2     Copyright (C) 2018-2023 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 "glthread/lock.h"
      22  
      23  #include "macros.h"
      24  
      25  gl_once_define(static, a_once)
      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    gl_once (a_once, a_init);
      39  
      40    ASSERT (a == 42);
      41  
      42    return 0;
      43  }