ffmpeg/libavutil/atomic_gcc.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_GCC_H
  22 #define AVUTIL_ATOMIC_GCC_H
  23
  24 #include <stdint.h>
  25
  26 #include "atomic.h"
  27
  28 #define avpriv_atomic_int_get atomic_int_get_gcc
  29 static inline int atomic_int_get_gcc(volatile int *ptr)
  30 {
  31     __sync_synchronize();
  32     return *ptr;
  33 }
  34
  35 #define avpriv_atomic_int_set atomic_int_set_gcc
  36 static inline void atomic_int_set_gcc(volatile int *ptr, int val)
  37 {
  38     *ptr = val;
  39     __sync_synchronize();
  40 }
  41
  42 #define avpriv_atomic_int_add_and_fetch atomic_int_add_and_fetch_gcc
  43 static inline int atomic_int_add_and_fetch_gcc(volatile int *ptr, int inc)
  44 {
  45     return __sync_add_and_fetch(ptr, inc);
  46 }
  47
  48 #define avpriv_atomic_ptr_cas atomic_ptr_cas_gcc
  49 static inline void *atomic_ptr_cas_gcc(void * volatile *ptr,
  50                                        void *oldval, void *newval)
  51 {
  52 #ifdef __ARMCC_VERSION
  53     // armcc will throw an error if ptr is not an integer type
  54     volatile uintptr_t *tmp = (volatile uintptr_t*)ptr;
  55     return (void*)__sync_val_compare_and_swap(tmp, oldval, newval);
  56 #else
  57     return __sync_val_compare_and_swap(ptr, oldval, newval);
  58 #endif
  59 }
  60
  61 #endif /* AVUTIL_ATOMIC_GCC_H */