| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___ATOMIC_SUPPORT_H |
| #define _LIBCPP___ATOMIC_SUPPORT_H |
| |
| #include <__config> |
| #include <__type_traits/is_trivially_copyable.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| // |
| // This file implements base support for atomics on the platform. |
| // |
| // The following operations and types must be implemented (where _Atmc |
| // is __cxx_atomic_base_impl for readability): |
| // |
| // clang-format off |
| // |
| // template <class _Tp> |
| // struct __cxx_atomic_base_impl; |
| // |
| // #define __cxx_atomic_is_lock_free(__size) |
| // |
| // void __cxx_atomic_thread_fence(memory_order __order) noexcept; |
| // void __cxx_atomic_signal_fence(memory_order __order) noexcept; |
| // |
| // template <class _Tp> |
| // void __cxx_atomic_init(_Atmc<_Tp> volatile* __a, _Tp __val) noexcept; |
| // template <class _Tp> |
| // void __cxx_atomic_init(_Atmc<_Tp>* __a, _Tp __val) noexcept; |
| // |
| // template <class _Tp> |
| // void __cxx_atomic_store(_Atmc<_Tp> volatile* __a, _Tp __val, memory_order __order) noexcept; |
| // template <class _Tp> |
| // void __cxx_atomic_store(_Atmc<_Tp>* __a, _Tp __val, memory_order __order) noexcept; |
| // |
| // template <class _Tp> |
| // _Tp __cxx_atomic_load(_Atmc<_Tp> const volatile* __a, memory_order __order) noexcept; |
| // template <class _Tp> |
| // _Tp __cxx_atomic_load(_Atmc<_Tp> const* __a, memory_order __order) noexcept; |
| // |
| // template <class _Tp> |
| // void __cxx_atomic_load_inplace(_Atmc<_Tp> const volatile* __a, _Tp* __dst, memory_order __order) noexcept; |
| // template <class _Tp> |
| // void __cxx_atomic_load_inplace(_Atmc<_Tp> const* __a, _Tp* __dst, memory_order __order) noexcept; |
| // |
| // template <class _Tp> |
| // _Tp __cxx_atomic_exchange(_Atmc<_Tp> volatile* __a, _Tp __value, memory_order __order) noexcept; |
| // template <class _Tp> |
| // _Tp __cxx_atomic_exchange(_Atmc<_Tp>* __a, _Tp __value, memory_order __order) noexcept; |
| // |
| // template <class _Tp> |
| // bool __cxx_atomic_compare_exchange_strong(_Atmc<_Tp> volatile* __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) noexcept; |
| // template <class _Tp> |
| // bool __cxx_atomic_compare_exchange_strong(_Atmc<_Tp>* __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) noexcept; |
| // |
| // template <class _Tp> |
| // bool __cxx_atomic_compare_exchange_weak(_Atmc<_Tp> volatile* __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) noexcept; |
| // template <class _Tp> |
| // bool __cxx_atomic_compare_exchange_weak(_Atmc<_Tp>* __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) noexcept; |
| // |
| // template <class _Tp> |
| // _Tp __cxx_atomic_fetch_add(_Atmc<_Tp> volatile* __a, _Tp __delta, memory_order __order) noexcept; |
| // template <class _Tp> |
| // _Tp __cxx_atomic_fetch_add(_Atmc<_Tp>* __a, _Tp __delta, memory_order __order) noexcept; |
| // |
| // template <class _Tp> |
| // _Tp* __cxx_atomic_fetch_add(_Atmc<_Tp*> volatile* __a, ptrdiff_t __delta, memory_order __order) noexcept; |
| // template <class _Tp> |
| // _Tp* __cxx_atomic_fetch_add(_Atmc<_Tp*>* __a, ptrdiff_t __delta, memory_order __order) noexcept; |
| // |
| // template <class _Tp> |
| // _Tp __cxx_atomic_fetch_sub(_Atmc<_Tp> volatile* __a, _Tp __delta, memory_order __order) noexcept; |
| // template <class _Tp> |
| // _Tp __cxx_atomic_fetch_sub(_Atmc<_Tp>* __a, _Tp __delta, memory_order __order) noexcept; |
| // template <class _Tp> |
| // _Tp* __cxx_atomic_fetch_sub(_Atmc<_Tp*> volatile* __a, ptrdiff_t __delta, memory_order __order) noexcept; |
| // template <class _Tp> |
| // _Tp* __cxx_atomic_fetch_sub(_Atmc<_Tp*>* __a, ptrdiff_t __delta, memory_order __order) noexcept; |
| // |
| // template <class _Tp> |
| // _Tp __cxx_atomic_fetch_and(_Atmc<_Tp> volatile* __a, _Tp __pattern, memory_order __order) noexcept; |
| // template <class _Tp> |
| // _Tp __cxx_atomic_fetch_and(_Atmc<_Tp>* __a, _Tp __pattern, memory_order __order) noexcept; |
| // |
| // template <class _Tp> |
| // _Tp __cxx_atomic_fetch_or(_Atmc<_Tp> volatile* __a, _Tp __pattern, memory_order __order) noexcept; |
| // template <class _Tp> |
| // _Tp __cxx_atomic_fetch_or(_Atmc<_Tp>* __a, _Tp __pattern, memory_order __order) noexcept; |
| // template <class _Tp> |
| // _Tp __cxx_atomic_fetch_xor(_Atmc<_Tp> volatile* __a, _Tp __pattern, memory_order __order) noexcept; |
| // template <class _Tp> |
| // _Tp __cxx_atomic_fetch_xor(_Atmc<_Tp>* __a, _Tp __pattern, memory_order __order) noexcept; |
| // |
| // clang-format on |
| // |
| |
| #if _LIBCPP_HAS_GCC_ATOMIC_IMP |
| # include <__atomic/support/gcc.h> |
| #elif _LIBCPP_HAS_C_ATOMIC_IMP |
| # include <__atomic/support/c11.h> |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template <typename _Tp, typename _Base = __cxx_atomic_base_impl<_Tp> > |
| struct __cxx_atomic_impl : public _Base { |
| static_assert(is_trivially_copyable<_Tp>::value, "std::atomic<T> requires that 'T' be a trivially copyable type"); |
| |
| _LIBCPP_HIDE_FROM_ABI __cxx_atomic_impl() _NOEXCEPT = default; |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR explicit __cxx_atomic_impl(_Tp __value) _NOEXCEPT : _Base(__value) {} |
| }; |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___ATOMIC_SUPPORT_H |