Mercurial > hg > forks > libbpg
comparison libavutil/atomic_gcc.h @ 0:772086c29cc7
Initial import.
author | Matti Hamalainen <ccr@tnsp.org> |
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date | Wed, 16 Nov 2016 11:16:33 +0200 |
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-1:000000000000 | 0:772086c29cc7 |
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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 */ |