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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 #if HAVE_ATOMIC_COMPARE_EXCHANGE
32  return __atomic_load_n(ptr, __ATOMIC_SEQ_CST);
33 #else
34  __sync_synchronize();
35  return *ptr;
36 #endif
37 }
38 
39 #define avpriv_atomic_int_set atomic_int_set_gcc
40 static inline void atomic_int_set_gcc(volatile int *ptr, int val)
41 {
42 #if HAVE_ATOMIC_COMPARE_EXCHANGE
43  __atomic_store_n(ptr, val, __ATOMIC_SEQ_CST);
44 #else
45  *ptr = val;
46  __sync_synchronize();
47 #endif
48 }
49 
50 #define avpriv_atomic_int_add_and_fetch atomic_int_add_and_fetch_gcc
51 static inline int atomic_int_add_and_fetch_gcc(volatile int *ptr, int inc)
52 {
53 #if HAVE_ATOMIC_COMPARE_EXCHANGE
54  return __atomic_add_fetch(ptr, inc, __ATOMIC_SEQ_CST);
55 #else
56  return __sync_add_and_fetch(ptr, inc);
57 #endif
58 }
59 
60 #define avpriv_atomic_ptr_cas atomic_ptr_cas_gcc
61 static inline void *atomic_ptr_cas_gcc(void * volatile *ptr,
62  void *oldval, void *newval)
63 {
64 #if HAVE_SYNC_VAL_COMPARE_AND_SWAP
65 #ifdef __ARMCC_VERSION
66  // armcc will throw an error if ptr is not an integer type
67  volatile uintptr_t *tmp = (volatile uintptr_t*)ptr;
68  return (void*)__sync_val_compare_and_swap(tmp, oldval, newval);
69 #else
70  return __sync_val_compare_and_swap(ptr, oldval, newval);
71 #endif
72 #else
73  __atomic_compare_exchange_n(ptr, &oldval, newval, 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
74  return oldval;
75 #endif
76 }
77 
78 #endif /* AVUTIL_ATOMIC_GCC_H */
const char const char void * val
Definition: avisynth_c.h:634
static void atomic_int_set_gcc(volatile int *ptr, int val)
Definition: atomic_gcc.h:40
static int atomic_int_add_and_fetch_gcc(volatile int *ptr, int inc)
Definition: atomic_gcc.h:51
static int atomic_int_get_gcc(volatile int *ptr)
Definition: atomic_gcc.h:29
static void * atomic_ptr_cas_gcc(void *volatile *ptr, void *oldval, void *newval)
Definition: atomic_gcc.h:61