1 /* Spin locks (native Windows implementation).
2    Copyright (C) 2019-2020 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, or (at your option)
7    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>, 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 */
48