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_SUPPORT_H 10 #define _LIBCPP___ATOMIC_SUPPORT_H 11 12 #include <__config> 13 14 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 15 # pragma GCC system_header 16 #endif 17 18 // 19 // This file implements base support for atomics on the platform. 20 // 21 // The following operations and types must be implemented (where _Atmc 22 // is __cxx_atomic_base_impl for readability): 23 // 24 // clang-format off 25 // 26 // template <class _Tp> 27 // struct __cxx_atomic_base_impl; 28 // 29 // #define __cxx_atomic_is_lock_free(__size) 30 // 31 // void __cxx_atomic_thread_fence(memory_order __order) noexcept; 32 // void __cxx_atomic_signal_fence(memory_order __order) noexcept; 33 // 34 // template <class _Tp> 35 // void __cxx_atomic_init(_Atmc<_Tp> volatile* __a, _Tp __val) noexcept; 36 // template <class _Tp> 37 // void __cxx_atomic_init(_Atmc<_Tp>* __a, _Tp __val) noexcept; 38 // 39 // template <class _Tp> 40 // void __cxx_atomic_store(_Atmc<_Tp> volatile* __a, _Tp __val, memory_order __order) noexcept; 41 // template <class _Tp> 42 // void __cxx_atomic_store(_Atmc<_Tp>* __a, _Tp __val, memory_order __order) noexcept; 43 // 44 // template <class _Tp> 45 // _Tp __cxx_atomic_load(_Atmc<_Tp> const volatile* __a, memory_order __order) noexcept; 46 // template <class _Tp> 47 // _Tp __cxx_atomic_load(_Atmc<_Tp> const* __a, memory_order __order) noexcept; 48 // 49 // template <class _Tp> 50 // void __cxx_atomic_load_inplace(_Atmc<_Tp> const volatile* __a, _Tp* __dst, memory_order __order) noexcept; 51 // template <class _Tp> 52 // void __cxx_atomic_load_inplace(_Atmc<_Tp> const* __a, _Tp* __dst, memory_order __order) noexcept; 53 // 54 // template <class _Tp> 55 // _Tp __cxx_atomic_exchange(_Atmc<_Tp> volatile* __a, _Tp __value, memory_order __order) noexcept; 56 // template <class _Tp> 57 // _Tp __cxx_atomic_exchange(_Atmc<_Tp>* __a, _Tp __value, memory_order __order) noexcept; 58 // 59 // template <class _Tp> 60 // bool __cxx_atomic_compare_exchange_strong(_Atmc<_Tp> volatile* __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) noexcept; 61 // template <class _Tp> 62 // bool __cxx_atomic_compare_exchange_strong(_Atmc<_Tp>* __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) noexcept; 63 // 64 // template <class _Tp> 65 // bool __cxx_atomic_compare_exchange_weak(_Atmc<_Tp> volatile* __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) noexcept; 66 // template <class _Tp> 67 // bool __cxx_atomic_compare_exchange_weak(_Atmc<_Tp>* __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) noexcept; 68 // 69 // template <class _Tp> 70 // _Tp __cxx_atomic_fetch_add(_Atmc<_Tp> volatile* __a, _Tp __delta, memory_order __order) noexcept; 71 // template <class _Tp> 72 // _Tp __cxx_atomic_fetch_add(_Atmc<_Tp>* __a, _Tp __delta, memory_order __order) noexcept; 73 // 74 // template <class _Tp> 75 // _Tp* __cxx_atomic_fetch_add(_Atmc<_Tp*> volatile* __a, ptrdiff_t __delta, memory_order __order) noexcept; 76 // template <class _Tp> 77 // _Tp* __cxx_atomic_fetch_add(_Atmc<_Tp*>* __a, ptrdiff_t __delta, memory_order __order) noexcept; 78 // 79 // template <class _Tp> 80 // _Tp __cxx_atomic_fetch_sub(_Atmc<_Tp> volatile* __a, _Tp __delta, memory_order __order) noexcept; 81 // template <class _Tp> 82 // _Tp __cxx_atomic_fetch_sub(_Atmc<_Tp>* __a, _Tp __delta, memory_order __order) noexcept; 83 // template <class _Tp> 84 // _Tp* __cxx_atomic_fetch_sub(_Atmc<_Tp*> volatile* __a, ptrdiff_t __delta, memory_order __order) noexcept; 85 // template <class _Tp> 86 // _Tp* __cxx_atomic_fetch_sub(_Atmc<_Tp*>* __a, ptrdiff_t __delta, memory_order __order) noexcept; 87 // 88 // template <class _Tp> 89 // _Tp __cxx_atomic_fetch_and(_Atmc<_Tp> volatile* __a, _Tp __pattern, memory_order __order) noexcept; 90 // template <class _Tp> 91 // _Tp __cxx_atomic_fetch_and(_Atmc<_Tp>* __a, _Tp __pattern, memory_order __order) noexcept; 92 // 93 // template <class _Tp> 94 // _Tp __cxx_atomic_fetch_or(_Atmc<_Tp> volatile* __a, _Tp __pattern, memory_order __order) noexcept; 95 // template <class _Tp> 96 // _Tp __cxx_atomic_fetch_or(_Atmc<_Tp>* __a, _Tp __pattern, memory_order __order) noexcept; 97 // template <class _Tp> 98 // _Tp __cxx_atomic_fetch_xor(_Atmc<_Tp> volatile* __a, _Tp __pattern, memory_order __order) noexcept; 99 // template <class _Tp> 100 // _Tp __cxx_atomic_fetch_xor(_Atmc<_Tp>* __a, _Tp __pattern, memory_order __order) noexcept; 101 // 102 // clang-format on 103 // 104 105 #if _LIBCPP_HAS_GCC_ATOMIC_IMP 106 # include <__atomic/support/gcc.h> 107 #elif _LIBCPP_HAS_C_ATOMIC_IMP 108 # include <__atomic/support/c11.h> 109 #endif 110 111 _LIBCPP_BEGIN_NAMESPACE_STD 112 113 template <typename _Tp, typename _Base = __cxx_atomic_base_impl<_Tp> > 114 struct __cxx_atomic_impl : public _Base { 115 _LIBCPP_HIDE_FROM_ABI __cxx_atomic_impl() _NOEXCEPT = default; __cxx_atomic_impl__cxx_atomic_impl116 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR explicit __cxx_atomic_impl(_Tp __value) _NOEXCEPT : _Base(__value) {} 117 }; 118 119 _LIBCPP_END_NAMESPACE_STD 120 121 #endif // _LIBCPP___ATOMIC_SUPPORT_H 122