lib/windows-spin.h

   1 /* Spin locks (native Windows implementation).
   2    Copyright (C) 2019-2024 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>, 2019.  */
  18
  19 #ifndef _WINDOWS_SPIN_H
  20 #define _WINDOWS_SPIN_H
  21
  22 #define WIN32_LEAN_AND_MEAN  /* avoid including junk */
  23 #include <windows.h>
  24
  25 typedef struct
  26         {
  27           LONG volatile word;
  28         }
  29         glwthread_spinlock_t;
  30
  31 #define GLWTHREAD_SPIN_INIT { 0 }
  32
  33 #ifdef __cplusplus
  34 extern "C" {
  35 #endif
  36
  37 extern void glwthread_spin_init (glwthread_spinlock_t *lock);
  38 extern int glwthread_spin_lock (glwthread_spinlock_t *lock);
  39 extern int glwthread_spin_trylock (glwthread_spinlock_t *lock);
  40 extern int glwthread_spin_unlock (glwthread_spinlock_t *lock);
  41 extern int glwthread_spin_destroy (glwthread_spinlock_t *lock);
  42
  43 #ifdef __cplusplus
  44 }
  45 #endif
  46
  47 #endif /* _WINDOWS_SPIN_H */