libcxx/include/__atomic/aliases.h

   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 <__type_traits/conditional.h>
  18 #include <__type_traits/make_unsigned.h>
  19 #include <cstddef>
  20 #include <cstdint>
  21
  22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  23 #  pragma GCC system_header
  24 #endif
  25
  26 _LIBCPP_BEGIN_NAMESPACE_STD
  27
  28 using atomic_bool   = atomic<bool>;
  29 using atomic_char   = atomic<char>;
  30 using atomic_schar  = atomic<signed char>;
  31 using atomic_uchar  = atomic<unsigned char>;
  32 using atomic_short  = atomic<short>;
  33 using atomic_ushort = atomic<unsigned short>;
  34 using atomic_int    = atomic<int>;
  35 using atomic_uint   = atomic<unsigned int>;
  36 using atomic_long   = atomic<long>;
  37 using atomic_ulong  = atomic<unsigned long>;
  38 using atomic_llong  = atomic<long long>;
  39 using atomic_ullong = atomic<unsigned long long>;
  40 #ifndef _LIBCPP_HAS_NO_CHAR8_T
  41 using atomic_char8_t = atomic<char8_t>;
  42 #endif
  43 using atomic_char16_t = atomic<char16_t>;
  44 using atomic_char32_t = atomic<char32_t>;
  45 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
  46 using atomic_wchar_t = atomic<wchar_t>;
  47 #endif
  48
  49 using atomic_int_least8_t   = atomic<int_least8_t>;
  50 using atomic_uint_least8_t  = atomic<uint_least8_t>;
  51 using atomic_int_least16_t  = atomic<int_least16_t>;
  52 using atomic_uint_least16_t = atomic<uint_least16_t>;
  53 using atomic_int_least32_t  = atomic<int_least32_t>;
  54 using atomic_uint_least32_t = atomic<uint_least32_t>;
  55 using atomic_int_least64_t  = atomic<int_least64_t>;
  56 using atomic_uint_least64_t = atomic<uint_least64_t>;
  57
  58 using atomic_int_fast8_t   = atomic<int_fast8_t>;
  59 using atomic_uint_fast8_t  = atomic<uint_fast8_t>;
  60 using atomic_int_fast16_t  = atomic<int_fast16_t>;
  61 using atomic_uint_fast16_t = atomic<uint_fast16_t>;
  62 using atomic_int_fast32_t  = atomic<int_fast32_t>;
  63 using atomic_uint_fast32_t = atomic<uint_fast32_t>;
  64 using atomic_int_fast64_t  = atomic<int_fast64_t>;
  65 using atomic_uint_fast64_t = atomic<uint_fast64_t>;
  66
  67 using atomic_int8_t   = atomic< int8_t>;
  68 using atomic_uint8_t  = atomic<uint8_t>;
  69 using atomic_int16_t  = atomic< int16_t>;
  70 using atomic_uint16_t = atomic<uint16_t>;
  71 using atomic_int32_t  = atomic< int32_t>;
  72 using atomic_uint32_t = atomic<uint32_t>;
  73 using atomic_int64_t  = atomic< int64_t>;
  74 using atomic_uint64_t = atomic<uint64_t>;
  75
  76 using atomic_intptr_t  = atomic<intptr_t>;
  77 using atomic_uintptr_t = atomic<uintptr_t>;
  78 using atomic_size_t    = atomic<size_t>;
  79 using atomic_ptrdiff_t = atomic<ptrdiff_t>;
  80 using atomic_intmax_t  = atomic<intmax_t>;
  81 using atomic_uintmax_t = atomic<uintmax_t>;
  82
  83 // C++20 atomic_{signed,unsigned}_lock_free: prefer the contention type most highly, then the largest lock-free type
  84 #if _LIBCPP_STD_VER >= 20
  85 #  if ATOMIC_LLONG_LOCK_FREE == 2
  86 using __largest_lock_free_type = long long;
  87 #  elif ATOMIC_INT_LOCK_FREE == 2
  88 using __largest_lock_free_type = int;
  89 #  elif ATOMIC_SHORT_LOCK_FREE == 2
  90 using __largest_lock_free_type = short;
  91 #  elif ATOMIC_CHAR_LOCK_FREE == 2
  92 using __largest_lock_free_type = char;
  93 #  else
  94 #    define _LIBCPP_NO_LOCK_FREE_TYPES // There are no lockfree types (this can happen on unusual platforms)
  95 #  endif
  96
  97 #  ifndef _LIBCPP_NO_LOCK_FREE_TYPES
  98 using __contention_t_or_largest =
  99     __conditional_t<__libcpp_is_always_lock_free<__cxx_contention_t>::__value,
 100                     __cxx_contention_t,
 101                     __largest_lock_free_type>;
 102
 103 using atomic_signed_lock_free   = atomic<__contention_t_or_largest>;
 104 using atomic_unsigned_lock_free = atomic<make_unsigned_t<__contention_t_or_largest>>;
 105 #  endif // !_LIBCPP_NO_LOCK_FREE_TYPES
 106 #endif   // C++20
 107
 108 _LIBCPP_END_NAMESPACE_STD
 109
 110 #endif // _LIBCPP___ATOMIC_ALIASES_H