clang  15.0.0git
stdatomic.h
Go to the documentation of this file.
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.
19  */
20 #if __STDC_HOSTED__ && __has_include_next(<stdatomic.h>) && !defined(_MSC_VER)
21 # include_next <stdatomic.h>
22 #else
23 
24 #include <stddef.h>
25 #include <stdint.h>
26 
27 #ifdef __cplusplus
28 extern "C" {
29 #endif
30 
31 /* 7.17.1 Introduction */
32 
33 #define ATOMIC_BOOL_LOCK_FREE __CLANG_ATOMIC_BOOL_LOCK_FREE
34 #define ATOMIC_CHAR_LOCK_FREE __CLANG_ATOMIC_CHAR_LOCK_FREE
35 #define ATOMIC_CHAR16_T_LOCK_FREE __CLANG_ATOMIC_CHAR16_T_LOCK_FREE
36 #define ATOMIC_CHAR32_T_LOCK_FREE __CLANG_ATOMIC_CHAR32_T_LOCK_FREE
37 #define ATOMIC_WCHAR_T_LOCK_FREE __CLANG_ATOMIC_WCHAR_T_LOCK_FREE
38 #define ATOMIC_SHORT_LOCK_FREE __CLANG_ATOMIC_SHORT_LOCK_FREE
39 #define ATOMIC_INT_LOCK_FREE __CLANG_ATOMIC_INT_LOCK_FREE
40 #define ATOMIC_LONG_LOCK_FREE __CLANG_ATOMIC_LONG_LOCK_FREE
41 #define ATOMIC_LLONG_LOCK_FREE __CLANG_ATOMIC_LLONG_LOCK_FREE
42 #define ATOMIC_POINTER_LOCK_FREE __CLANG_ATOMIC_POINTER_LOCK_FREE
43 
44 /* 7.17.2 Initialization */
45 
46 #define ATOMIC_VAR_INIT(value) (value)
47 #if (__STDC_VERSION__ >= 201710L || __cplusplus >= 202002L) && \
48  !defined(_CLANG_DISABLE_CRT_DEPRECATION_WARNINGS)
49 /* ATOMIC_VAR_INIT was deprecated in C17 and C++20. */
50 #pragma clang deprecated(ATOMIC_VAR_INIT)
51 #endif
52 #define atomic_init __c11_atomic_init
53 
54 /* 7.17.3 Order and consistency */
55 
56 typedef enum memory_order {
57  memory_order_relaxed = __ATOMIC_RELAXED,
58  memory_order_consume = __ATOMIC_CONSUME,
59  memory_order_acquire = __ATOMIC_ACQUIRE,
60  memory_order_release = __ATOMIC_RELEASE,
61  memory_order_acq_rel = __ATOMIC_ACQ_REL,
62  memory_order_seq_cst = __ATOMIC_SEQ_CST
63 } memory_order;
64 
65 #define kill_dependency(y) (y)
66 
67 /* 7.17.4 Fences */
68 
69 /* These should be provided by the libc implementation. */
70 void atomic_thread_fence(memory_order);
71 void atomic_signal_fence(memory_order);
72 
73 #define atomic_thread_fence(order) __c11_atomic_thread_fence(order)
74 #define atomic_signal_fence(order) __c11_atomic_signal_fence(order)
75 
76 /* 7.17.5 Lock-free property */
77 
78 #define atomic_is_lock_free(obj) __c11_atomic_is_lock_free(sizeof(*(obj)))
79 
80 /* 7.17.6 Atomic integer types */
81 
82 #ifdef __cplusplus
83 typedef _Atomic(bool) atomic_bool;
84 #else
85 typedef _Atomic(_Bool) atomic_bool;
86 #endif
87 typedef _Atomic(char) atomic_char;
88 typedef _Atomic(signed char) atomic_schar;
89 typedef _Atomic(unsigned char) atomic_uchar;
90 typedef _Atomic(short) atomic_short;
91 typedef _Atomic(unsigned short) atomic_ushort;
92 typedef _Atomic(int) atomic_int;
93 typedef _Atomic(unsigned int) atomic_uint;
94 typedef _Atomic(long) atomic_long;
95 typedef _Atomic(unsigned long) atomic_ulong;
96 typedef _Atomic(long long) atomic_llong;
97 typedef _Atomic(unsigned long long) atomic_ullong;
98 typedef _Atomic(uint_least16_t) atomic_char16_t;
99 typedef _Atomic(uint_least32_t) atomic_char32_t;
100 typedef _Atomic(wchar_t) atomic_wchar_t;
101 typedef _Atomic(int_least8_t) atomic_int_least8_t;
102 typedef _Atomic(uint_least8_t) atomic_uint_least8_t;
103 typedef _Atomic(int_least16_t) atomic_int_least16_t;
104 typedef _Atomic(uint_least16_t) atomic_uint_least16_t;
105 typedef _Atomic(int_least32_t) atomic_int_least32_t;
106 typedef _Atomic(uint_least32_t) atomic_uint_least32_t;
107 typedef _Atomic(int_least64_t) atomic_int_least64_t;
108 typedef _Atomic(uint_least64_t) atomic_uint_least64_t;
109 typedef _Atomic(int_fast8_t) atomic_int_fast8_t;
110 typedef _Atomic(uint_fast8_t) atomic_uint_fast8_t;
111 typedef _Atomic(int_fast16_t) atomic_int_fast16_t;
112 typedef _Atomic(uint_fast16_t) atomic_uint_fast16_t;
113 typedef _Atomic(int_fast32_t) atomic_int_fast32_t;
114 typedef _Atomic(uint_fast32_t) atomic_uint_fast32_t;
115 typedef _Atomic(int_fast64_t) atomic_int_fast64_t;
116 typedef _Atomic(uint_fast64_t) atomic_uint_fast64_t;
117 typedef _Atomic(intptr_t) atomic_intptr_t;
118 typedef _Atomic(uintptr_t) atomic_uintptr_t;
119 typedef _Atomic(size_t) atomic_size_t;
120 typedef _Atomic(ptrdiff_t) atomic_ptrdiff_t;
121 typedef _Atomic(intmax_t) atomic_intmax_t;
122 typedef _Atomic(uintmax_t) atomic_uintmax_t;
123 
124 /* 7.17.7 Operations on atomic types */
125 
126 #define atomic_store(object, desired) __c11_atomic_store(object, desired, __ATOMIC_SEQ_CST)
127 #define atomic_store_explicit __c11_atomic_store
128 
129 #define atomic_load(object) __c11_atomic_load(object, __ATOMIC_SEQ_CST)
130 #define atomic_load_explicit __c11_atomic_load
131 
132 #define atomic_exchange(object, desired) __c11_atomic_exchange(object, desired, __ATOMIC_SEQ_CST)
133 #define atomic_exchange_explicit __c11_atomic_exchange
134 
135 #define atomic_compare_exchange_strong(object, expected, desired) __c11_atomic_compare_exchange_strong(object, expected, desired, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)
136 #define atomic_compare_exchange_strong_explicit __c11_atomic_compare_exchange_strong
137 
138 #define atomic_compare_exchange_weak(object, expected, desired) __c11_atomic_compare_exchange_weak(object, expected, desired, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)
139 #define atomic_compare_exchange_weak_explicit __c11_atomic_compare_exchange_weak
140 
141 #define atomic_fetch_add(object, operand) __c11_atomic_fetch_add(object, operand, __ATOMIC_SEQ_CST)
142 #define atomic_fetch_add_explicit __c11_atomic_fetch_add
143 
144 #define atomic_fetch_sub(object, operand) __c11_atomic_fetch_sub(object, operand, __ATOMIC_SEQ_CST)
145 #define atomic_fetch_sub_explicit __c11_atomic_fetch_sub
146 
147 #define atomic_fetch_or(object, operand) __c11_atomic_fetch_or(object, operand, __ATOMIC_SEQ_CST)
148 #define atomic_fetch_or_explicit __c11_atomic_fetch_or
149 
150 #define atomic_fetch_xor(object, operand) __c11_atomic_fetch_xor(object, operand, __ATOMIC_SEQ_CST)
151 #define atomic_fetch_xor_explicit __c11_atomic_fetch_xor
152 
153 #define atomic_fetch_and(object, operand) __c11_atomic_fetch_and(object, operand, __ATOMIC_SEQ_CST)
154 #define atomic_fetch_and_explicit __c11_atomic_fetch_and
155 
156 /* 7.17.8 Atomic flag type and operations */
157 
158 typedef struct atomic_flag { atomic_bool _Value; } atomic_flag;
159 
160 #define ATOMIC_FLAG_INIT { 0 }
161 #if __cplusplus >= 202002L && !defined(_CLANG_DISABLE_CRT_DEPRECATION_WARNINGS)
162 /* ATOMIC_FLAG_INIT was deprecated in C++20 but is not deprecated in C. */
163 #pragma clang deprecated(ATOMIC_FLAG_INIT)
164 #endif
165 
166 /* These should be provided by the libc implementation. */
167 #ifdef __cplusplus
168 bool atomic_flag_test_and_set(volatile atomic_flag *);
169 bool atomic_flag_test_and_set_explicit(volatile atomic_flag *, memory_order);
170 #else
171 _Bool atomic_flag_test_and_set(volatile atomic_flag *);
172 _Bool atomic_flag_test_and_set_explicit(volatile atomic_flag *, memory_order);
173 #endif
174 void atomic_flag_clear(volatile atomic_flag *);
175 void atomic_flag_clear_explicit(volatile atomic_flag *, memory_order);
176 
177 #define atomic_flag_test_and_set(object) __c11_atomic_exchange(&(object)->_Value, 1, __ATOMIC_SEQ_CST)
178 #define atomic_flag_test_and_set_explicit(object, order) __c11_atomic_exchange(&(object)->_Value, 1, order)
179 
180 #define atomic_flag_clear(object) __c11_atomic_store(&(object)->_Value, 0, __ATOMIC_SEQ_CST)
181 #define atomic_flag_clear_explicit(object, order) __c11_atomic_store(&(object)->_Value, 0, order)
182 
183 #ifdef __cplusplus
184 }
185 #endif
186 
187 #endif /* __STDC_HOSTED__ */
188 #endif /* __CLANG_STDATOMIC_H */
189 
atomic_flag_clear_explicit
#define atomic_flag_clear_explicit(object, order)
Definition: stdatomic.h:181
memory_order_relaxed
@ memory_order_relaxed
Definition: stdatomic.h:57
atomic_flag
Definition: stdatomic.h:158
_Atomic
typedef _Atomic(_Bool) atomic_bool
memory_order
memory_order
Definition: opencl-c-base.h:398
atomic_flag_test_and_set
#define atomic_flag_test_and_set(object)
Definition: stdatomic.h:177
atomic_thread_fence
#define atomic_thread_fence(order)
Definition: stdatomic.h:73
intmax_t
__INTMAX_TYPE__ intmax_t
Definition: stdint.h:262
memory_order_release
@ memory_order_release
Definition: stdatomic.h:60
intptr_t
__INTPTR_TYPE__ intptr_t
A signed integer type with the property that any valid pointer to void can be converted to this type,...
Definition: opencl-c-base.h:133
uintptr_t
__UINTPTR_TYPE__ uintptr_t
An unsigned integer type with the property that any valid pointer to void can be converted to this ty...
Definition: opencl-c-base.h:140
atomic_signal_fence
#define atomic_signal_fence(order)
Definition: stdatomic.h:74
uintmax_t
__UINTMAX_TYPE__ uintmax_t
Definition: stdint.h:263
memory_order_acquire
@ memory_order_acquire
Definition: stdatomic.h:59
stdint.h
memory_order_consume
@ memory_order_consume
Definition: stdatomic.h:58
atomic_flag_clear
#define atomic_flag_clear(object)
Definition: stdatomic.h:180
atomic_flag::_Value
atomic_bool _Value
Definition: stdatomic.h:158
memory_order_seq_cst
@ memory_order_seq_cst
Definition: stdatomic.h:62
memory_order
memory_order
Definition: stdatomic.h:56
atomic_flag
struct atomic_flag atomic_flag
ptrdiff_t
__PTRDIFF_TYPE__ ptrdiff_t
A signed integer type that is the result of subtracting two pointers.
Definition: opencl-c-base.h:126
stddef.h
memory_order_acq_rel
@ memory_order_acq_rel
Definition: stdatomic.h:61
atomic_flag_test_and_set_explicit
#define atomic_flag_test_and_set_explicit(object, order)
Definition: stdatomic.h:178
Generated on Sat Jun 25 2022 12:42:36 for clang by   doxygen 1.8.17