clang 19.0.0git
stdatomic.h
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1/*===---- stdatomic.h - Standard header for atomic types and operations -----===
2 *
3 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 * See https://llvm.org/LICENSE.txt for license information.
5 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 *
7 *===-----------------------------------------------------------------------===
8 */
9
10#ifndef __CLANG_STDATOMIC_H
11#define __CLANG_STDATOMIC_H
12
13/* If we're hosted, fall back to the system's stdatomic.h. FreeBSD, for
14 * example, already has a Clang-compatible stdatomic.h header.
15 *
16 * Exclude the MSVC path as well as the MSVC header as of the 14.31.30818
17 * explicitly disallows `stdatomic.h` in the C mode via an `#error`. Fallback
18 * to the clang resource header until that is fully supported. The
19 * `stdatomic.h` header requires C++23 or newer.
20 */
21#if __STDC_HOSTED__ && \
22 __has_include_next(<stdatomic.h>) && \
23 (!defined(_MSC_VER) || (defined(__cplusplus) && __cplusplus >= 202002L))
24# include_next <stdatomic.h>
25#else
26
27#include <stddef.h>
28#include <stdint.h>
29
30#ifdef __cplusplus
31extern "C" {
32#endif
33
34/* 7.17.1 Introduction */
35
36#define ATOMIC_BOOL_LOCK_FREE __CLANG_ATOMIC_BOOL_LOCK_FREE
37#define ATOMIC_CHAR_LOCK_FREE __CLANG_ATOMIC_CHAR_LOCK_FREE
38#define ATOMIC_CHAR16_T_LOCK_FREE __CLANG_ATOMIC_CHAR16_T_LOCK_FREE
39#define ATOMIC_CHAR32_T_LOCK_FREE __CLANG_ATOMIC_CHAR32_T_LOCK_FREE
40#define ATOMIC_WCHAR_T_LOCK_FREE __CLANG_ATOMIC_WCHAR_T_LOCK_FREE
41#define ATOMIC_SHORT_LOCK_FREE __CLANG_ATOMIC_SHORT_LOCK_FREE
42#define ATOMIC_INT_LOCK_FREE __CLANG_ATOMIC_INT_LOCK_FREE
43#define ATOMIC_LONG_LOCK_FREE __CLANG_ATOMIC_LONG_LOCK_FREE
44#define ATOMIC_LLONG_LOCK_FREE __CLANG_ATOMIC_LLONG_LOCK_FREE
45#define ATOMIC_POINTER_LOCK_FREE __CLANG_ATOMIC_POINTER_LOCK_FREE
46
47/* 7.17.2 Initialization */
48#if (defined(__STDC_VERSION__) && __STDC_VERSION__ < 202311L) || \
49 defined(__cplusplus)
50/* ATOMIC_VAR_INIT was removed in C23, but still remains in C++23. */
51#define ATOMIC_VAR_INIT(value) (value)
52#endif
53
54#if ((defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201710L && \
55 __STDC_VERSION__ < 202311L) || \
56 (defined(__cplusplus) && __cplusplus >= 202002L)) && \
57 !defined(_CLANG_DISABLE_CRT_DEPRECATION_WARNINGS)
58/* ATOMIC_VAR_INIT was deprecated in C17 and C++20. */
59#pragma clang deprecated(ATOMIC_VAR_INIT)
60#endif
61#define atomic_init __c11_atomic_init
62
63/* 7.17.3 Order and consistency */
64
65typedef enum memory_order {
66 memory_order_relaxed = __ATOMIC_RELAXED,
67 memory_order_consume = __ATOMIC_CONSUME,
68 memory_order_acquire = __ATOMIC_ACQUIRE,
69 memory_order_release = __ATOMIC_RELEASE,
70 memory_order_acq_rel = __ATOMIC_ACQ_REL,
71 memory_order_seq_cst = __ATOMIC_SEQ_CST
73
74#define kill_dependency(y) (y)
75
76/* 7.17.4 Fences */
77
78/* These should be provided by the libc implementation. */
81
82#define atomic_thread_fence(order) __c11_atomic_thread_fence(order)
83#define atomic_signal_fence(order) __c11_atomic_signal_fence(order)
84
85/* 7.17.5 Lock-free property */
86
87#define atomic_is_lock_free(obj) __c11_atomic_is_lock_free(sizeof(*(obj)))
88
89/* 7.17.6 Atomic integer types */
90
91#ifdef __cplusplus
92typedef _Atomic(bool) atomic_bool;
93#else
94typedef _Atomic(_Bool) atomic_bool;
95#endif
96typedef _Atomic(char) atomic_char;
97typedef _Atomic(signed char) atomic_schar;
98typedef _Atomic(unsigned char) atomic_uchar;
99typedef _Atomic(short) atomic_short;
100typedef _Atomic(unsigned short) atomic_ushort;
101typedef _Atomic(int) atomic_int;
102typedef _Atomic(unsigned int) atomic_uint;
103typedef _Atomic(long) atomic_long;
104typedef _Atomic(unsigned long) atomic_ulong;
105typedef _Atomic(long long) atomic_llong;
106typedef _Atomic(unsigned long long) atomic_ullong;
107typedef _Atomic(uint_least16_t) atomic_char16_t;
108typedef _Atomic(uint_least32_t) atomic_char32_t;
109typedef _Atomic(wchar_t) atomic_wchar_t;
110typedef _Atomic(int_least8_t) atomic_int_least8_t;
111typedef _Atomic(uint_least8_t) atomic_uint_least8_t;
112typedef _Atomic(int_least16_t) atomic_int_least16_t;
113typedef _Atomic(uint_least16_t) atomic_uint_least16_t;
114typedef _Atomic(int_least32_t) atomic_int_least32_t;
115typedef _Atomic(uint_least32_t) atomic_uint_least32_t;
116typedef _Atomic(int_least64_t) atomic_int_least64_t;
117typedef _Atomic(uint_least64_t) atomic_uint_least64_t;
118typedef _Atomic(int_fast8_t) atomic_int_fast8_t;
119typedef _Atomic(uint_fast8_t) atomic_uint_fast8_t;
120typedef _Atomic(int_fast16_t) atomic_int_fast16_t;
121typedef _Atomic(uint_fast16_t) atomic_uint_fast16_t;
122typedef _Atomic(int_fast32_t) atomic_int_fast32_t;
123typedef _Atomic(uint_fast32_t) atomic_uint_fast32_t;
124typedef _Atomic(int_fast64_t) atomic_int_fast64_t;
125typedef _Atomic(uint_fast64_t) atomic_uint_fast64_t;
126typedef _Atomic(intptr_t) atomic_intptr_t;
127typedef _Atomic(uintptr_t) atomic_uintptr_t;
128typedef _Atomic(size_t) atomic_size_t;
129typedef _Atomic(ptrdiff_t) atomic_ptrdiff_t;
130typedef _Atomic(intmax_t) atomic_intmax_t;
131typedef _Atomic(uintmax_t) atomic_uintmax_t;
132
133/* 7.17.7 Operations on atomic types */
134
135#define atomic_store(object, desired) __c11_atomic_store(object, desired, __ATOMIC_SEQ_CST)
136#define atomic_store_explicit __c11_atomic_store
137
138#define atomic_load(object) __c11_atomic_load(object, __ATOMIC_SEQ_CST)
139#define atomic_load_explicit __c11_atomic_load
140
141#define atomic_exchange(object, desired) __c11_atomic_exchange(object, desired, __ATOMIC_SEQ_CST)
142#define atomic_exchange_explicit __c11_atomic_exchange
143
144#define atomic_compare_exchange_strong(object, expected, desired) __c11_atomic_compare_exchange_strong(object, expected, desired, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)
145#define atomic_compare_exchange_strong_explicit __c11_atomic_compare_exchange_strong
146
147#define atomic_compare_exchange_weak(object, expected, desired) __c11_atomic_compare_exchange_weak(object, expected, desired, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)
148#define atomic_compare_exchange_weak_explicit __c11_atomic_compare_exchange_weak
149
150#define atomic_fetch_add(object, operand) __c11_atomic_fetch_add(object, operand, __ATOMIC_SEQ_CST)
151#define atomic_fetch_add_explicit __c11_atomic_fetch_add
152
153#define atomic_fetch_sub(object, operand) __c11_atomic_fetch_sub(object, operand, __ATOMIC_SEQ_CST)
154#define atomic_fetch_sub_explicit __c11_atomic_fetch_sub
155
156#define atomic_fetch_or(object, operand) __c11_atomic_fetch_or(object, operand, __ATOMIC_SEQ_CST)
157#define atomic_fetch_or_explicit __c11_atomic_fetch_or
158
159#define atomic_fetch_xor(object, operand) __c11_atomic_fetch_xor(object, operand, __ATOMIC_SEQ_CST)
160#define atomic_fetch_xor_explicit __c11_atomic_fetch_xor
161
162#define atomic_fetch_and(object, operand) __c11_atomic_fetch_and(object, operand, __ATOMIC_SEQ_CST)
163#define atomic_fetch_and_explicit __c11_atomic_fetch_and
164
165/* 7.17.8 Atomic flag type and operations */
166
167typedef struct atomic_flag { atomic_bool _Value; } atomic_flag;
168
169#define ATOMIC_FLAG_INIT { 0 }
170
171/* These should be provided by the libc implementation. */
172#ifdef __cplusplus
175#else
178#endif
181
182#define atomic_flag_test_and_set(object) __c11_atomic_exchange(&(object)->_Value, 1, __ATOMIC_SEQ_CST)
183#define atomic_flag_test_and_set_explicit(object, order) __c11_atomic_exchange(&(object)->_Value, 1, order)
184
185#define atomic_flag_clear(object) __c11_atomic_store(&(object)->_Value, 0, __ATOMIC_SEQ_CST)
186#define atomic_flag_clear_explicit(object, order) __c11_atomic_store(&(object)->_Value, 0, order)
187
188#ifdef __cplusplus
189}
190#endif
191
192#endif /* __STDC_HOSTED__ */
193#endif /* __CLANG_STDATOMIC_H */
194
__PTRDIFF_TYPE__ ptrdiff_t
__INTPTR_TYPE__ intptr_t
A signed integer type with the property that any valid pointer to void can be converted to this type,...
memory_order
__UINTPTR_TYPE__ uintptr_t
An unsigned integer type with the property that any valid pointer to void can be converted to this ty...
memory_order
Definition: stdatomic.h:65
@ memory_order_consume
Definition: stdatomic.h:67
@ memory_order_seq_cst
Definition: stdatomic.h:71
@ memory_order_release
Definition: stdatomic.h:69
@ memory_order_relaxed
Definition: stdatomic.h:66
@ memory_order_acq_rel
Definition: stdatomic.h:70
@ memory_order_acquire
Definition: stdatomic.h:68
#define atomic_flag_clear(object)
Definition: stdatomic.h:185
#define atomic_signal_fence(order)
Definition: stdatomic.h:83
#define atomic_thread_fence(order)
Definition: stdatomic.h:82
#define atomic_flag_test_and_set_explicit(object, order)
Definition: stdatomic.h:183
#define atomic_flag_test_and_set(object)
Definition: stdatomic.h:182
#define atomic_flag_clear_explicit(object, order)
Definition: stdatomic.h:186
typedef _Atomic(_Bool) atomic_bool
__UINTMAX_TYPE__ uintmax_t
Definition: stdint.h:305
__INTMAX_TYPE__ intmax_t
Definition: stdint.h:304
atomic_bool _Value
Definition: stdatomic.h:167