1//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ATOMIC_ALIASES_H
10#define _LIBCPP___ATOMIC_ALIASES_H
11
12#include <__atomic/atomic.h>
13#include <__atomic/atomic_lock_free.h>
14#include <__atomic/contention_t.h>
15#include <__atomic/is_always_lock_free.h>
16#include <__config>
17#include <__cstddef/ptrdiff_t.h>
18#include <__cstddef/size_t.h>
19#include <__type_traits/conditional.h>
20#include <__type_traits/make_unsigned.h>
21#include <cstdint>
22
23#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
24# pragma GCC system_header
25#endif
26
27_LIBCPP_BEGIN_NAMESPACE_STD
28
29using atomic_bool = atomic<bool>;
30using atomic_char = atomic<char>;
31using atomic_schar = atomic<signed char>;
32using atomic_uchar = atomic<unsigned char>;
33using atomic_short = atomic<short>;
34using atomic_ushort = atomic<unsigned short>;
35using atomic_int = atomic<int>;
36using atomic_uint = atomic<unsigned int>;
37using atomic_long = atomic<long>;
38using atomic_ulong = atomic<unsigned long>;
39using atomic_llong = atomic<long long>;
40using atomic_ullong = atomic<unsigned long long>;
41#if _LIBCPP_HAS_CHAR8_T
42using atomic_char8_t = atomic<char8_t>;
43#endif
44using atomic_char16_t = atomic<char16_t>;
45using atomic_char32_t = atomic<char32_t>;
46#if _LIBCPP_HAS_WIDE_CHARACTERS
47using atomic_wchar_t = atomic<wchar_t>;
48#endif
49
50using atomic_int_least8_t = atomic<int_least8_t>;
51using atomic_uint_least8_t = atomic<uint_least8_t>;
52using atomic_int_least16_t = atomic<int_least16_t>;
53using atomic_uint_least16_t = atomic<uint_least16_t>;
54using atomic_int_least32_t = atomic<int_least32_t>;
55using atomic_uint_least32_t = atomic<uint_least32_t>;
56using atomic_int_least64_t = atomic<int_least64_t>;
57using atomic_uint_least64_t = atomic<uint_least64_t>;
58
59using atomic_int_fast8_t = atomic<int_fast8_t>;
60using atomic_uint_fast8_t = atomic<uint_fast8_t>;
61using atomic_int_fast16_t = atomic<int_fast16_t>;
62using atomic_uint_fast16_t = atomic<uint_fast16_t>;
63using atomic_int_fast32_t = atomic<int_fast32_t>;
64using atomic_uint_fast32_t = atomic<uint_fast32_t>;
65using atomic_int_fast64_t = atomic<int_fast64_t>;
66using atomic_uint_fast64_t = atomic<uint_fast64_t>;
67
68using atomic_int8_t = atomic< int8_t>;
69using atomic_uint8_t = atomic<uint8_t>;
70using atomic_int16_t = atomic< int16_t>;
71using atomic_uint16_t = atomic<uint16_t>;
72using atomic_int32_t = atomic< int32_t>;
73using atomic_uint32_t = atomic<uint32_t>;
74using atomic_int64_t = atomic< int64_t>;
75using atomic_uint64_t = atomic<uint64_t>;
76
77using atomic_intptr_t = atomic<intptr_t>;
78using atomic_uintptr_t = atomic<uintptr_t>;
79using atomic_size_t = atomic<size_t>;
80using atomic_ptrdiff_t = atomic<ptrdiff_t>;
81using atomic_intmax_t = atomic<intmax_t>;
82using atomic_uintmax_t = atomic<uintmax_t>;
83
84// C++20 atomic_{signed,unsigned}_lock_free: prefer the contention type most highly, then the largest lock-free type
85#if _LIBCPP_STD_VER >= 20
86# if ATOMIC_LLONG_LOCK_FREE == 2
87using __largest_lock_free_type _LIBCPP_NODEBUG = long long;
88# elif ATOMIC_INT_LOCK_FREE == 2
89using __largest_lock_free_type _LIBCPP_NODEBUG = int;
90# elif ATOMIC_SHORT_LOCK_FREE == 2
91using __largest_lock_free_type _LIBCPP_NODEBUG = short;
92# elif ATOMIC_CHAR_LOCK_FREE == 2
93using __largest_lock_free_type _LIBCPP_NODEBUG = char;
94# else
95# define _LIBCPP_NO_LOCK_FREE_TYPES // There are no lockfree types (this can happen on unusual platforms)
96# endif
97
98# ifndef _LIBCPP_NO_LOCK_FREE_TYPES
99using __contention_t_or_largest _LIBCPP_NODEBUG =
100 __conditional_t<__libcpp_is_always_lock_free<__cxx_contention_t>::__value,
101 __cxx_contention_t,
102 __largest_lock_free_type>;
103
104using atomic_signed_lock_free = atomic<__contention_t_or_largest>;
105using atomic_unsigned_lock_free = atomic<make_unsigned_t<__contention_t_or_largest>>;
106# endif // !_LIBCPP_NO_LOCK_FREE_TYPES
107#endif // C++20
108
109_LIBCPP_END_NAMESPACE_STD
110
111#endif // _LIBCPP___ATOMIC_ALIASES_H
112