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atomic_gcc.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_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 */