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| 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_DUMMY_STDATOMIC_H |
| 25 | +#define COMPAT_ATOMICS_DUMMY_STDATOMIC_H |
| 26 | + |
| 27 | +#include <stdint.h> |
| 28 | + |
| 29 | +#define ATOMIC_FLAG_INIT 0 |
| 30 | + |
| 31 | +#define ATOMIC_VAR_INIT(value) (value) |
| 32 | + |
| 33 | +#define atomic_init(obj, value) \ |
| 34 | +do { \ |
| 35 | + *(obj) = (value); \ |
| 36 | +} while(0) |
| 37 | + |
| 38 | +#define kill_dependency(y) ((void)0) |
| 39 | + |
| 40 | +#define atomic_thread_fence(order) \ |
| 41 | + ((void)0) |
| 42 | + |
| 43 | +#define atomic_signal_fence(order) \ |
| 44 | + ((void)0) |
| 45 | + |
| 46 | +#define atomic_is_lock_free(obj) 0 |
| 47 | + |
| 48 | +typedef intptr_t atomic_flag; |
| 49 | +typedef intptr_t atomic_bool; |
| 50 | +typedef intptr_t atomic_char; |
| 51 | +typedef intptr_t atomic_schar; |
| 52 | +typedef intptr_t atomic_uchar; |
| 53 | +typedef intptr_t atomic_short; |
| 54 | +typedef intptr_t atomic_ushort; |
| 55 | +typedef intptr_t atomic_int; |
| 56 | +typedef intptr_t atomic_uint; |
| 57 | +typedef intptr_t atomic_long; |
| 58 | +typedef intptr_t atomic_ulong; |
| 59 | +typedef intptr_t atomic_llong; |
| 60 | +typedef intptr_t atomic_ullong; |
| 61 | +typedef intptr_t atomic_wchar_t; |
| 62 | +typedef intptr_t atomic_int_least8_t; |
| 63 | +typedef intptr_t atomic_uint_least8_t; |
| 64 | +typedef intptr_t atomic_int_least16_t; |
| 65 | +typedef intptr_t atomic_uint_least16_t; |
| 66 | +typedef intptr_t atomic_int_least32_t; |
| 67 | +typedef intptr_t atomic_uint_least32_t; |
| 68 | +typedef intptr_t atomic_int_least64_t; |
| 69 | +typedef intptr_t atomic_uint_least64_t; |
| 70 | +typedef intptr_t atomic_int_fast8_t; |
| 71 | +typedef intptr_t atomic_uint_fast8_t; |
| 72 | +typedef intptr_t atomic_int_fast16_t; |
| 73 | +typedef intptr_t atomic_uint_fast16_t; |
| 74 | +typedef intptr_t atomic_int_fast32_t; |
| 75 | +typedef intptr_t atomic_uint_fast32_t; |
| 76 | +typedef intptr_t atomic_int_fast64_t; |
| 77 | +typedef intptr_t atomic_uint_fast64_t; |
| 78 | +typedef intptr_t atomic_intptr_t; |
| 79 | +typedef intptr_t atomic_uintptr_t; |
| 80 | +typedef intptr_t atomic_size_t; |
| 81 | +typedef intptr_t atomic_ptrdiff_t; |
| 82 | +typedef intptr_t atomic_intmax_t; |
| 83 | +typedef intptr_t atomic_uintmax_t; |
| 84 | + |
| 85 | +#define atomic_store(object, desired) \ |
| 86 | +do { \ |
| 87 | + *(object) = (desired); \ |
| 88 | +} while (0) |
| 89 | + |
| 90 | +#define atomic_store_explicit(object, desired, order) \ |
| 91 | + atomic_store(object, desired) |
| 92 | + |
| 93 | +#define atomic_load(object) \ |
| 94 | + (*(object)) |
| 95 | + |
| 96 | +#define atomic_load_explicit(object, order) \ |
| 97 | + atomic_load(object) |
| 98 | + |
| 99 | +static inline intptr_t atomic_exchange(intptr_t *object, intptr_t desired) |
| 100 | +{ |
| 101 | + intptr_t ret = *object; |
| 102 | + *object = desired; |
| 103 | + return ret; |
| 104 | +} |
| 105 | + |
| 106 | +#define atomic_exchange_explicit(object, desired, order) \ |
| 107 | + atomic_exchange(object, desired) |
| 108 | + |
| 109 | +static inline int atomic_compare_exchange_strong(intptr_t *object, intptr_t *expected, |
| 110 | + intptr_t desired) |
| 111 | +{ |
| 112 | + int ret; |
| 113 | + if (*object == *expected) { |
| 114 | + *object = desired; |
| 115 | + ret = 1; |
| 116 | + } else { |
| 117 | + *expected = *object; |
| 118 | + ret = 0; |
| 119 | + } |
| 120 | + return ret; |
| 121 | +} |
| 122 | + |
| 123 | +#define atomic_compare_exchange_strong_explicit(object, expected, desired, success, failure) \ |
| 124 | + atomic_compare_exchange_strong(object, expected, desired) |
| 125 | + |
| 126 | +#define atomic_compare_exchange_weak(object, expected, desired) \ |
| 127 | + atomic_compare_exchange_strong(object, expected, desired) |
| 128 | + |
| 129 | +#define atomic_compare_exchange_weak_explicit(object, expected, desired, success, failure) \ |
| 130 | + atomic_compare_exchange_weak(object, expected, desired) |
| 131 | + |
| 132 | +#define FETCH_MODIFY(opname, op) \ |
| 133 | +static inline intptr_t atomic_fetch_ ## opname(intptr_t *object, intptr_t operand) \ |
| 134 | +{ \ |
| 135 | + intptr_t ret; \ |
| 136 | + ret = *object; \ |
| 137 | + *object = *object op operand; \ |
| 138 | + return ret; \ |
| 139 | +} |
| 140 | + |
| 141 | +FETCH_MODIFY(add, +) |
| 142 | +FETCH_MODIFY(sub, -) |
| 143 | +FETCH_MODIFY(or, |) |
| 144 | +FETCH_MODIFY(xor, ^) |
| 145 | +FETCH_MODIFY(and, &) |
| 146 | + |
| 147 | +#undef FETCH_MODIFY |
| 148 | + |
| 149 | +#define atomic_fetch_add_explicit(object, operand, order) \ |
| 150 | + atomic_fetch_add(object, operand) |
| 151 | + |
| 152 | +#define atomic_fetch_sub_explicit(object, operand, order) \ |
| 153 | + atomic_fetch_sub(object, operand) |
| 154 | + |
| 155 | +#define atomic_fetch_or_explicit(object, operand, order) \ |
| 156 | + atomic_fetch_or(object, operand) |
| 157 | + |
| 158 | +#define atomic_fetch_xor_explicit(object, operand, order) \ |
| 159 | + atomic_fetch_xor(object, operand) |
| 160 | + |
| 161 | +#define atomic_fetch_and_explicit(object, operand, order) \ |
| 162 | + atomic_fetch_and(object, operand) |
| 163 | + |
| 164 | +#define atomic_flag_test_and_set(object) \ |
| 165 | + atomic_exchange(object, 1) |
| 166 | + |
| 167 | +#define atomic_flag_test_and_set_explicit(object, order) \ |
| 168 | + atomic_flag_test_and_set(object) |
| 169 | + |
| 170 | +#define atomic_flag_clear(object) \ |
| 171 | + atomic_store(object, 0) |
| 172 | + |
| 173 | +#define atomic_flag_clear_explicit(object, order) \ |
| 174 | + atomic_flag_clear(object) |
| 175 | + |
| 176 | +#endif /* COMPAT_ATOMICS_DUMMY_STDATOMIC_H */ |
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