ffmpeg/libavutil/atomic_win32.h

   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 #define WIN32_LEAN_AND_MEAN
  25 #include <windows.h>
  26
  27 #define avpriv_atomic_int_get atomic_int_get_win32
  28 static inline int atomic_int_get_win32(volatile int *ptr)
  29 {
  30     MemoryBarrier();
  31     return *ptr;
  32 }
  33
  34 #define avpriv_atomic_int_set atomic_int_set_win32
  35 static inline void atomic_int_set_win32(volatile int *ptr, int val)
  36 {
  37     *ptr = val;
  38     MemoryBarrier();
  39 }
  40
  41 #define avpriv_atomic_int_add_and_fetch atomic_int_add_and_fetch_win32
  42 static inline int atomic_int_add_and_fetch_win32(volatile int *ptr, int inc)
  43 {
  44     return inc + InterlockedExchangeAdd(ptr, inc);
  45 }
  46
  47 #define avpriv_atomic_ptr_cas atomic_ptr_cas_win32
  48 static inline void *atomic_ptr_cas_win32(void * volatile *ptr,
  49                                          void *oldval, void *newval)
  50 {
  51     return InterlockedCompareExchangePointer(ptr, newval, oldval);
  52 }
  53
  54 #endif /* AVUTIL_ATOMIC_WIN32_H */