1 /* 2 * This file is part of FFmpeg. 3 * 4 * FFmpeg is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * FFmpeg is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with FFmpeg; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 19 /* 20 * based on vlc_atomic.h from VLC 21 * Copyright (C) 2010 Rémi Denis-Courmont 22 */ 23 24 #ifndef COMPAT_ATOMICS_GCC_STDATOMIC_H 25 #define COMPAT_ATOMICS_GCC_STDATOMIC_H 26 27 #include <stddef.h> 28 #include <stdint.h> 29 30 #define ATOMIC_FLAG_INIT 0 31 32 #define ATOMIC_VAR_INIT(value) (value) 33 34 #define atomic_init(obj, value) \ 35 do { \ 36 *(obj) = (value); \ 37 } while(0) 38 39 #define kill_dependency(y) ((void)0) 40 41 #define atomic_thread_fence(order) \ 42 __sync_synchronize() 43 44 #define atomic_signal_fence(order) \ 45 ((void)0) 46 47 #define atomic_is_lock_free(obj) 0 48 49 typedef _Bool atomic_flag; 50 typedef _Bool atomic_bool; 51 typedef char atomic_char; 52 typedef signed char atomic_schar; 53 typedef unsigned char atomic_uchar; 54 typedef short atomic_short; 55 typedef unsigned short atomic_ushort; 56 typedef int atomic_int; 57 typedef unsigned int atomic_uint; 58 typedef long atomic_long; 59 typedef unsigned long atomic_ulong; 60 typedef long long atomic_llong; 61 typedef unsigned long long atomic_ullong; 62 typedef wchar_t atomic_wchar_t; 63 typedef int_least8_t atomic_int_least8_t; 64 typedef uint_least8_t atomic_uint_least8_t; 65 typedef int_least16_t atomic_int_least16_t; 66 typedef uint_least16_t atomic_uint_least16_t; 67 typedef int_least32_t atomic_int_least32_t; 68 typedef uint_least32_t atomic_uint_least32_t; 69 typedef int_least64_t atomic_int_least64_t; 70 typedef uint_least64_t atomic_uint_least64_t; 71 typedef int_fast8_t atomic_int_fast8_t; 72 typedef uint_fast8_t atomic_uint_fast8_t; 73 typedef int_fast16_t atomic_int_fast16_t; 74 typedef uint_fast16_t atomic_uint_fast16_t; 75 typedef int_fast32_t atomic_int_fast32_t; 76 typedef uint_fast32_t atomic_uint_fast32_t; 77 typedef int_fast64_t atomic_int_fast64_t; 78 typedef uint_fast64_t atomic_uint_fast64_t; 79 typedef intptr_t atomic_intptr_t; 80 typedef uintptr_t atomic_uintptr_t; 81 typedef size_t atomic_size_t; 82 typedef ptrdiff_t atomic_ptrdiff_t; 83 typedef intmax_t atomic_intmax_t; 84 typedef uintmax_t atomic_uintmax_t; 85 86 #define atomic_store(object, desired) \ 87 do { \ 88 *(object) = (desired); \ 89 __sync_synchronize(); \ 90 } while (0) 91 92 #define atomic_store_explicit(object, desired, order) \ 93 atomic_store(object, desired) 94 95 #define atomic_load(object) \ 96 (__sync_synchronize(), *(object)) 97 98 #define atomic_load_explicit(object, order) \ 99 atomic_load(object) 100 101 #define atomic_exchange(object, desired) \ 102 ({ \ 103 __typeof__(object) _obj = (object); \ 104 __typeof__(*object) _old; \ 105 do \ 106 _old = atomic_load(_obj); \ 107 while (!__sync_bool_compare_and_swap(_obj, _old, (desired))); \ 108 _old; \ 109 }) 110 111 #define atomic_exchange_explicit(object, desired, order) \ 112 atomic_exchange(object, desired) 113 114 #define atomic_compare_exchange_strong(object, expected, desired) \ 115 ({ \ 116 __typeof__(object) _exp = (expected); \ 117 __typeof__(*object) _old = *_exp; \ 118 *_exp = __sync_val_compare_and_swap((object), _old, (desired)); \ 119 *_exp == _old; \ 120 }) 121 122 #define atomic_compare_exchange_strong_explicit(object, expected, desired, success, failure) \ 123 atomic_compare_exchange_strong(object, expected, desired) 124 125 #define atomic_compare_exchange_weak(object, expected, desired) \ 126 atomic_compare_exchange_strong(object, expected, desired) 127 128 #define atomic_compare_exchange_weak_explicit(object, expected, desired, success, failure) \ 129 atomic_compare_exchange_weak(object, expected, desired) 130 131 #define atomic_fetch_add(object, operand) \ 132 __sync_fetch_and_add(object, operand) 133 134 #define atomic_fetch_add_explicit(object, operand, order) \ 135 atomic_fetch_add(object, operand) 136 137 #define atomic_fetch_sub(object, operand) \ 138 __sync_fetch_and_sub(object, operand) 139 140 #define atomic_fetch_sub_explicit(object, operand, order) \ 141 atomic_fetch_sub(object, operand) 142 143 #define atomic_fetch_or(object, operand) \ 144 __sync_fetch_and_or(object, operand) 145 146 #define atomic_fetch_or_explicit(object, operand, order) \ 147 atomic_fetch_or(object, operand) 148 149 #define atomic_fetch_xor(object, operand) \ 150 __sync_fetch_and_xor(object, operand) 151 152 #define atomic_fetch_xor_explicit(object, operand, order) \ 153 atomic_fetch_xor(object, operand) 154 155 #define atomic_fetch_and(object, operand) \ 156 __sync_fetch_and_and(object, operand) 157 158 #define atomic_fetch_and_explicit(object, operand, order) \ 159 atomic_fetch_and(object, operand) 160 161 #define atomic_flag_test_and_set(object) \ 162 atomic_exchange(object, 1) 163 164 #define atomic_flag_test_and_set_explicit(object, order) \ 165 atomic_flag_test_and_set(object) 166 167 #define atomic_flag_clear(object) \ 168 atomic_store(object, 0) 169 170 #define atomic_flag_clear_explicit(object, order) \ 171 atomic_flag_clear(object) 172 173 #endif /* COMPAT_ATOMICS_GCC_STDATOMIC_H */ 174