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1 /*===---- stdatomic.h - Standard header for atomic types and operations -----===
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2 *
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3 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 * See https://llvm.org/LICENSE.txt for license information.
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5 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 *
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7 *===-----------------------------------------------------------------------===
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8 */
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9
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10 #ifndef __CLANG_STDATOMIC_H
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11 #define __CLANG_STDATOMIC_H
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12
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13 /* If we're hosted, fall back to the system's stdatomic.h. FreeBSD, for
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14 * example, already has a Clang-compatible stdatomic.h header.
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15 */
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16 #if __STDC_HOSTED__ && __has_include_next(<stdatomic.h>)
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17 # include_next <stdatomic.h>
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18 #else
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19
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20 #include <stddef.h>
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21 #include <stdint.h>
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22
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23 #ifdef __cplusplus
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24 extern "C" {
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25 #endif
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26
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27 /* 7.17.1 Introduction */
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28
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29 #define ATOMIC_BOOL_LOCK_FREE __CLANG_ATOMIC_BOOL_LOCK_FREE
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30 #define ATOMIC_CHAR_LOCK_FREE __CLANG_ATOMIC_CHAR_LOCK_FREE
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31 #define ATOMIC_CHAR16_T_LOCK_FREE __CLANG_ATOMIC_CHAR16_T_LOCK_FREE
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32 #define ATOMIC_CHAR32_T_LOCK_FREE __CLANG_ATOMIC_CHAR32_T_LOCK_FREE
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33 #define ATOMIC_WCHAR_T_LOCK_FREE __CLANG_ATOMIC_WCHAR_T_LOCK_FREE
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34 #define ATOMIC_SHORT_LOCK_FREE __CLANG_ATOMIC_SHORT_LOCK_FREE
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35 #define ATOMIC_INT_LOCK_FREE __CLANG_ATOMIC_INT_LOCK_FREE
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36 #define ATOMIC_LONG_LOCK_FREE __CLANG_ATOMIC_LONG_LOCK_FREE
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37 #define ATOMIC_LLONG_LOCK_FREE __CLANG_ATOMIC_LLONG_LOCK_FREE
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38 #define ATOMIC_POINTER_LOCK_FREE __CLANG_ATOMIC_POINTER_LOCK_FREE
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39
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40 /* 7.17.2 Initialization */
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41
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42 #define ATOMIC_VAR_INIT(value) (value)
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43 #define atomic_init __c11_atomic_init
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44
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45 /* 7.17.3 Order and consistency */
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46
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47 typedef enum memory_order {
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48 memory_order_relaxed = __ATOMIC_RELAXED,
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49 memory_order_consume = __ATOMIC_CONSUME,
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50 memory_order_acquire = __ATOMIC_ACQUIRE,
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51 memory_order_release = __ATOMIC_RELEASE,
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52 memory_order_acq_rel = __ATOMIC_ACQ_REL,
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53 memory_order_seq_cst = __ATOMIC_SEQ_CST
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54 } memory_order;
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55
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56 #define kill_dependency(y) (y)
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57
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58 /* 7.17.4 Fences */
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59
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60 /* These should be provided by the libc implementation. */
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61 void atomic_thread_fence(memory_order);
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62 void atomic_signal_fence(memory_order);
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63
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64 #define atomic_thread_fence(order) __c11_atomic_thread_fence(order)
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65 #define atomic_signal_fence(order) __c11_atomic_signal_fence(order)
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66
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67 /* 7.17.5 Lock-free property */
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68
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69 #define atomic_is_lock_free(obj) __c11_atomic_is_lock_free(sizeof(*(obj)))
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70
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71 /* 7.17.6 Atomic integer types */
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72
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73 #ifdef __cplusplus
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74 typedef _Atomic(bool) atomic_bool;
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75 #else
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76 typedef _Atomic(_Bool) atomic_bool;
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77 #endif
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78 typedef _Atomic(char) atomic_char;
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79 typedef _Atomic(signed char) atomic_schar;
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80 typedef _Atomic(unsigned char) atomic_uchar;
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81 typedef _Atomic(short) atomic_short;
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82 typedef _Atomic(unsigned short) atomic_ushort;
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83 typedef _Atomic(int) atomic_int;
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84 typedef _Atomic(unsigned int) atomic_uint;
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85 typedef _Atomic(long) atomic_long;
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86 typedef _Atomic(unsigned long) atomic_ulong;
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87 typedef _Atomic(long long) atomic_llong;
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88 typedef _Atomic(unsigned long long) atomic_ullong;
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89 typedef _Atomic(uint_least16_t) atomic_char16_t;
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90 typedef _Atomic(uint_least32_t) atomic_char32_t;
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91 typedef _Atomic(wchar_t) atomic_wchar_t;
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92 typedef _Atomic(int_least8_t) atomic_int_least8_t;
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93 typedef _Atomic(uint_least8_t) atomic_uint_least8_t;
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94 typedef _Atomic(int_least16_t) atomic_int_least16_t;
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95 typedef _Atomic(uint_least16_t) atomic_uint_least16_t;
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96 typedef _Atomic(int_least32_t) atomic_int_least32_t;
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97 typedef _Atomic(uint_least32_t) atomic_uint_least32_t;
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98 typedef _Atomic(int_least64_t) atomic_int_least64_t;
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99 typedef _Atomic(uint_least64_t) atomic_uint_least64_t;
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100 typedef _Atomic(int_fast8_t) atomic_int_fast8_t;
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101 typedef _Atomic(uint_fast8_t) atomic_uint_fast8_t;
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102 typedef _Atomic(int_fast16_t) atomic_int_fast16_t;
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103 typedef _Atomic(uint_fast16_t) atomic_uint_fast16_t;
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104 typedef _Atomic(int_fast32_t) atomic_int_fast32_t;
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105 typedef _Atomic(uint_fast32_t) atomic_uint_fast32_t;
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106 typedef _Atomic(int_fast64_t) atomic_int_fast64_t;
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107 typedef _Atomic(uint_fast64_t) atomic_uint_fast64_t;
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108 typedef _Atomic(intptr_t) atomic_intptr_t;
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109 typedef _Atomic(uintptr_t) atomic_uintptr_t;
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110 typedef _Atomic(size_t) atomic_size_t;
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111 typedef _Atomic(ptrdiff_t) atomic_ptrdiff_t;
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112 typedef _Atomic(intmax_t) atomic_intmax_t;
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113 typedef _Atomic(uintmax_t) atomic_uintmax_t;
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114
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115 /* 7.17.7 Operations on atomic types */
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116
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117 #define atomic_store(object, desired) __c11_atomic_store(object, desired, __ATOMIC_SEQ_CST)
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118 #define atomic_store_explicit __c11_atomic_store
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119
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120 #define atomic_load(object) __c11_atomic_load(object, __ATOMIC_SEQ_CST)
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121 #define atomic_load_explicit __c11_atomic_load
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122
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123 #define atomic_exchange(object, desired) __c11_atomic_exchange(object, desired, __ATOMIC_SEQ_CST)
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124 #define atomic_exchange_explicit __c11_atomic_exchange
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125
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126 #define atomic_compare_exchange_strong(object, expected, desired) __c11_atomic_compare_exchange_strong(object, expected, desired, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)
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127 #define atomic_compare_exchange_strong_explicit __c11_atomic_compare_exchange_strong
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128
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129 #define atomic_compare_exchange_weak(object, expected, desired) __c11_atomic_compare_exchange_weak(object, expected, desired, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)
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130 #define atomic_compare_exchange_weak_explicit __c11_atomic_compare_exchange_weak
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131
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132 #define atomic_fetch_add(object, operand) __c11_atomic_fetch_add(object, operand, __ATOMIC_SEQ_CST)
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133 #define atomic_fetch_add_explicit __c11_atomic_fetch_add
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134
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135 #define atomic_fetch_sub(object, operand) __c11_atomic_fetch_sub(object, operand, __ATOMIC_SEQ_CST)
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136 #define atomic_fetch_sub_explicit __c11_atomic_fetch_sub
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137
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138 #define atomic_fetch_or(object, operand) __c11_atomic_fetch_or(object, operand, __ATOMIC_SEQ_CST)
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139 #define atomic_fetch_or_explicit __c11_atomic_fetch_or
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140
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141 #define atomic_fetch_xor(object, operand) __c11_atomic_fetch_xor(object, operand, __ATOMIC_SEQ_CST)
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142 #define atomic_fetch_xor_explicit __c11_atomic_fetch_xor
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143
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144 #define atomic_fetch_and(object, operand) __c11_atomic_fetch_and(object, operand, __ATOMIC_SEQ_CST)
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145 #define atomic_fetch_and_explicit __c11_atomic_fetch_and
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146
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147 /* 7.17.8 Atomic flag type and operations */
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148
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149 typedef struct atomic_flag { atomic_bool _Value; } atomic_flag;
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150
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151 #define ATOMIC_FLAG_INIT { 0 }
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152
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153 /* These should be provided by the libc implementation. */
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154 #ifdef __cplusplus
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155 bool atomic_flag_test_and_set(volatile atomic_flag *);
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156 bool atomic_flag_test_and_set_explicit(volatile atomic_flag *, memory_order);
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157 #else
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158 _Bool atomic_flag_test_and_set(volatile atomic_flag *);
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159 _Bool atomic_flag_test_and_set_explicit(volatile atomic_flag *, memory_order);
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160 #endif
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161 void atomic_flag_clear(volatile atomic_flag *);
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162 void atomic_flag_clear_explicit(volatile atomic_flag *, memory_order);
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163
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164 #define atomic_flag_test_and_set(object) __c11_atomic_exchange(&(object)->_Value, 1, __ATOMIC_SEQ_CST)
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165 #define atomic_flag_test_and_set_explicit(object, order) __c11_atomic_exchange(&(object)->_Value, 1, order)
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166
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167 #define atomic_flag_clear(object) __c11_atomic_store(&(object)->_Value, 0, __ATOMIC_SEQ_CST)
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168 #define atomic_flag_clear_explicit(object, order) __c11_atomic_store(&(object)->_Value, 0, order)
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169
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170 #ifdef __cplusplus
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171 }
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172 #endif
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173
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174 #endif /* __STDC_HOSTED__ */
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175 #endif /* __CLANG_STDATOMIC_H */
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176
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