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stdatomic.h
/*===---- stdatomic.h - Standard header for atomic types and operations -----=== * * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. * See https://llvm.org/LICENSE.txt for license information. * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception * *===-----------------------------------------------------------------------=== */ #ifndef __CLANG_STDATOMIC_H #define __CLANG_STDATOMIC_H /* If we're hosted, fall back to the system's stdatomic.h. FreeBSD, for * example, already has a Clang-compatible stdatomic.h header. * * Exclude the MSVC path as well as the MSVC header as of the 14.31.30818 * explicitly disallows `stdatomic.h` in the C mode via an `#error`. Fallback * to the clang resource header until that is fully supported. The * `stdatomic.h` header requires C++23 or newer. */ #if __STDC_HOSTED__ && \ __has_include_next(<stdatomic.h>) && \ (!defined(_MSC_VER) || (defined(__cplusplus) && __cplusplus >= 202002L)) # include_next <stdatomic.h> #else #include <stddef.h> #include <stdint.h> #ifdef __cplusplus extern "C" { #endif /* 7.17.1 Introduction */ #define ATOMIC_BOOL_LOCK_FREE __CLANG_ATOMIC_BOOL_LOCK_FREE #define ATOMIC_CHAR_LOCK_FREE __CLANG_ATOMIC_CHAR_LOCK_FREE #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L #define ATOMIC_CHAR8_T_LOCK_FREE __CLANG_ATOMIC_CHAR8_T_LOCK_FREE #endif #define ATOMIC_CHAR16_T_LOCK_FREE __CLANG_ATOMIC_CHAR16_T_LOCK_FREE #define ATOMIC_CHAR32_T_LOCK_FREE __CLANG_ATOMIC_CHAR32_T_LOCK_FREE #define ATOMIC_WCHAR_T_LOCK_FREE __CLANG_ATOMIC_WCHAR_T_LOCK_FREE #define ATOMIC_SHORT_LOCK_FREE __CLANG_ATOMIC_SHORT_LOCK_FREE #define ATOMIC_INT_LOCK_FREE __CLANG_ATOMIC_INT_LOCK_FREE #define ATOMIC_LONG_LOCK_FREE __CLANG_ATOMIC_LONG_LOCK_FREE #define ATOMIC_LLONG_LOCK_FREE __CLANG_ATOMIC_LLONG_LOCK_FREE #define ATOMIC_POINTER_LOCK_FREE __CLANG_ATOMIC_POINTER_LOCK_FREE /* 7.17.2 Initialization */ #if (defined(__STDC_VERSION__) && __STDC_VERSION__ < 202311L) || \ defined(__cplusplus) /* ATOMIC_VAR_INIT was removed in C23, but still remains in C++23. */ #define ATOMIC_VAR_INIT(value) (value) #endif #if ((defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201710L && \ __STDC_VERSION__ < 202311L) || \ (defined(__cplusplus) && __cplusplus >= 202002L)) && \ !defined(_CLANG_DISABLE_CRT_DEPRECATION_WARNINGS) /* ATOMIC_VAR_INIT was deprecated in C17 and C++20. */ #pragma clang deprecated(ATOMIC_VAR_INIT) #endif #define atomic_init __c11_atomic_init /* 7.17.3 Order and consistency */ typedef enum memory_order { memory_order_relaxed = __ATOMIC_RELAXED, memory_order_consume = __ATOMIC_CONSUME, memory_order_acquire = __ATOMIC_ACQUIRE, memory_order_release = __ATOMIC_RELEASE, memory_order_acq_rel = __ATOMIC_ACQ_REL, memory_order_seq_cst = __ATOMIC_SEQ_CST } memory_order; #define kill_dependency(y) (y) /* 7.17.4 Fences */ /* These should be provided by the libc implementation. */ void atomic_thread_fence(memory_order); void atomic_signal_fence(memory_order); #define atomic_thread_fence(order) __c11_atomic_thread_fence(order) #define atomic_signal_fence(order) __c11_atomic_signal_fence(order) /* 7.17.5 Lock-free property */ #define atomic_is_lock_free(obj) __c11_atomic_is_lock_free(sizeof(*(obj))) /* 7.17.6 Atomic integer types */ #ifdef __cplusplus typedef _Atomic(bool) atomic_bool; #else typedef _Atomic(_Bool) atomic_bool; #endif typedef _Atomic(char) atomic_char; typedef _Atomic(signed char) atomic_schar; typedef _Atomic(unsigned char) atomic_uchar; typedef _Atomic(short) atomic_short; typedef _Atomic(unsigned short) atomic_ushort; typedef _Atomic(int) atomic_int; typedef _Atomic(unsigned int) atomic_uint; typedef _Atomic(long) atomic_long; typedef _Atomic(unsigned long) atomic_ulong; typedef _Atomic(long long) atomic_llong; typedef _Atomic(unsigned long long) atomic_ullong; #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L typedef _Atomic(unsigned char) atomic_char8_t; #endif typedef _Atomic(uint_least16_t) atomic_char16_t; typedef _Atomic(uint_least32_t) atomic_char32_t; typedef _Atomic(wchar_t) atomic_wchar_t; typedef _Atomic(int_least8_t) atomic_int_least8_t; typedef _Atomic(uint_least8_t) atomic_uint_least8_t; typedef _Atomic(int_least16_t) atomic_int_least16_t; typedef _Atomic(uint_least16_t) atomic_uint_least16_t; typedef _Atomic(int_least32_t) atomic_int_least32_t; typedef _Atomic(uint_least32_t) atomic_uint_least32_t; typedef _Atomic(int_least64_t) atomic_int_least64_t; typedef _Atomic(uint_least64_t) atomic_uint_least64_t; typedef _Atomic(int_fast8_t) atomic_int_fast8_t; typedef _Atomic(uint_fast8_t) atomic_uint_fast8_t; typedef _Atomic(int_fast16_t) atomic_int_fast16_t; typedef _Atomic(uint_fast16_t) atomic_uint_fast16_t; typedef _Atomic(int_fast32_t) atomic_int_fast32_t; typedef _Atomic(uint_fast32_t) atomic_uint_fast32_t; typedef _Atomic(int_fast64_t) atomic_int_fast64_t; typedef _Atomic(uint_fast64_t) atomic_uint_fast64_t; typedef _Atomic(intptr_t) atomic_intptr_t; typedef _Atomic(uintptr_t) atomic_uintptr_t; typedef _Atomic(size_t) atomic_size_t; typedef _Atomic(ptrdiff_t) atomic_ptrdiff_t; typedef _Atomic(intmax_t) atomic_intmax_t; typedef _Atomic(uintmax_t) atomic_uintmax_t; /* 7.17.7 Operations on atomic types */ #define atomic_store(object, desired) __c11_atomic_store(object, desired, __ATOMIC_SEQ_CST) #define atomic_store_explicit __c11_atomic_store #define atomic_load(object) __c11_atomic_load(object, __ATOMIC_SEQ_CST) #define atomic_load_explicit __c11_atomic_load #define atomic_exchange(object, desired) __c11_atomic_exchange(object, desired, __ATOMIC_SEQ_CST) #define atomic_exchange_explicit __c11_atomic_exchange #define atomic_compare_exchange_strong(object, expected, desired) __c11_atomic_compare_exchange_strong(object, expected, desired, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) #define atomic_compare_exchange_strong_explicit __c11_atomic_compare_exchange_strong #define atomic_compare_exchange_weak(object, expected, desired) __c11_atomic_compare_exchange_weak(object, expected, desired, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) #define atomic_compare_exchange_weak_explicit __c11_atomic_compare_exchange_weak #define atomic_fetch_add(object, operand) __c11_atomic_fetch_add(object, operand, __ATOMIC_SEQ_CST) #define atomic_fetch_add_explicit __c11_atomic_fetch_add #define atomic_fetch_sub(object, operand) __c11_atomic_fetch_sub(object, operand, __ATOMIC_SEQ_CST) #define atomic_fetch_sub_explicit __c11_atomic_fetch_sub #define atomic_fetch_or(object, operand) __c11_atomic_fetch_or(object, operand, __ATOMIC_SEQ_CST) #define atomic_fetch_or_explicit __c11_atomic_fetch_or #define atomic_fetch_xor(object, operand) __c11_atomic_fetch_xor(object, operand, __ATOMIC_SEQ_CST) #define atomic_fetch_xor_explicit __c11_atomic_fetch_xor #define atomic_fetch_and(object, operand) __c11_atomic_fetch_and(object, operand, __ATOMIC_SEQ_CST) #define atomic_fetch_and_explicit __c11_atomic_fetch_and /* 7.17.8 Atomic flag type and operations */ typedef struct atomic_flag { atomic_bool _Value; } atomic_flag; #ifdef __cplusplus #define ATOMIC_FLAG_INIT {false} #else #define ATOMIC_FLAG_INIT { 0 } #endif /* These should be provided by the libc implementation. */ #ifdef __cplusplus bool atomic_flag_test_and_set(volatile atomic_flag *); bool atomic_flag_test_and_set_explicit(volatile atomic_flag *, memory_order); #else _Bool atomic_flag_test_and_set(volatile atomic_flag *); _Bool atomic_flag_test_and_set_explicit(volatile atomic_flag *, memory_order); #endif void atomic_flag_clear(volatile atomic_flag *); void atomic_flag_clear_explicit(volatile atomic_flag *, memory_order); #define atomic_flag_test_and_set(object) __c11_atomic_exchange(&(object)->_Value, 1, __ATOMIC_SEQ_CST) #define atomic_flag_test_and_set_explicit(object, order) __c11_atomic_exchange(&(object)->_Value, 1, order) #define atomic_flag_clear(object) __c11_atomic_store(&(object)->_Value, 0, __ATOMIC_SEQ_CST) #define atomic_flag_clear_explicit(object, order) __c11_atomic_store(&(object)->_Value, 0, order) #ifdef __cplusplus } #endif #endif /* __STDC_HOSTED__ */ #endif /* __CLANG_STDATOMIC_H */
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