gl/windows-once.h

   1 /* Once-only control (native Windows implementation).
   2    Copyright (C) 2005-2024 Free Software Foundation, Inc.
   3
   4    This file is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as
   6    published by the Free Software Foundation; either version 2.1 of the
   7    License, or (at your option) any later version.
   8
   9    This file 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 Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser 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>, 2005.
  18    Based on GCC's gthr-win32.h.  */
  19
  20 #ifndef _WINDOWS_ONCE_H
  21 #define _WINDOWS_ONCE_H
  22
  23 #define WIN32_LEAN_AND_MEAN  /* avoid including junk */
  24 #include <windows.h>
  25
  26 typedef struct
  27         {
  28           volatile int inited;
  29           volatile LONG started;
  30           CRITICAL_SECTION lock;
  31         }
  32         glwthread_once_t;
  33
  34 #define GLWTHREAD_ONCE_INIT { -1, -1 }
  35
  36 #ifdef __cplusplus
  37 extern "C" {
  38 #endif
  39
  40 extern void glwthread_once (glwthread_once_t *once_control,
  41                             void (*initfunction) (void));
  42
  43 #ifdef __cplusplus
  44 }
  45 #endif
  46
  47 #endif /* _WINDOWS_ONCE_H */