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atomic_win32.h
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1 /*
2  * Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVUTIL_ATOMIC_WIN32_H
22 #define AVUTIL_ATOMIC_WIN32_H
23 
24 #include <windows.h>
25 
26 #define avpriv_atomic_int_get atomic_int_get_win32
27 static inline int atomic_int_get_win32(volatile int *ptr)
28 {
29  MemoryBarrier();
30  return *ptr;
31 }
32 
33 #define avpriv_atomic_int_set atomic_int_set_win32
34 static inline void atomic_int_set_win32(volatile int *ptr, int val)
35 {
36  *ptr = val;
37  MemoryBarrier();
38 }
39 
40 #define avpriv_atomic_int_add_and_fetch atomic_int_add_and_fetch_win32
41 static inline int atomic_int_add_and_fetch_win32(volatile int *ptr, int inc)
42 {
43  return inc + InterlockedExchangeAdd(ptr, inc);
44 }
45 
46 #define avpriv_atomic_ptr_cas atomic_ptr_cas_win32
47 static inline void *atomic_ptr_cas_win32(void * volatile *ptr,
48  void *oldval, void *newval)
49 {
50  return InterlockedCompareExchangePointer(ptr, newval, oldval);
51 }
52 
53 #endif /* AVUTIL_ATOMIC_WIN32_H */