f41f392520
This uses std::addressof everywherein atomic. This is not strictly needed for the integral and floating point specializations. They should not be used by user defined types. But it's easier to fix everything. Note these changes are made using a WIP clang-tidy plugin. Reviewed By: #libc, ldionne Differential Revision: https://reviews.llvm.org/D144786
832 lines
29 KiB
C++
832 lines
29 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ATOMIC_CXX_ATOMIC_IMPL_H
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#define _LIBCPP___ATOMIC_CXX_ATOMIC_IMPL_H
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#include <__atomic/is_always_lock_free.h>
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#include <__atomic/memory_order.h>
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#include <__config>
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#include <__memory/addressof.h>
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#include <__type_traits/conditional.h>
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#include <__type_traits/is_assignable.h>
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#include <__type_traits/is_trivially_copyable.h>
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#include <__type_traits/remove_const.h>
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#include <cstddef>
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#include <cstring>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if defined(_LIBCPP_HAS_GCC_ATOMIC_IMP) || \
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defined(_LIBCPP_ATOMIC_ONLY_USE_BUILTINS)
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// [atomics.types.generic]p1 guarantees _Tp is trivially copyable. Because
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// the default operator= in an object is not volatile, a byte-by-byte copy
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// is required.
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template <typename _Tp, typename _Tv> _LIBCPP_HIDE_FROM_ABI
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typename enable_if<is_assignable<_Tp&, _Tv>::value>::type
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__cxx_atomic_assign_volatile(_Tp& __a_value, _Tv const& __val) {
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__a_value = __val;
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}
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template <typename _Tp, typename _Tv> _LIBCPP_HIDE_FROM_ABI
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typename enable_if<is_assignable<_Tp&, _Tv>::value>::type
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__cxx_atomic_assign_volatile(_Tp volatile& __a_value, _Tv volatile const& __val) {
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volatile char* __to = reinterpret_cast<volatile char*>(std::addressof(__a_value));
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volatile char* __end = __to + sizeof(_Tp);
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volatile const char* __from = reinterpret_cast<volatile const char*>(std::addressof(__val));
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while (__to != __end)
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*__to++ = *__from++;
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}
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#endif
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#if defined(_LIBCPP_HAS_GCC_ATOMIC_IMP)
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template <typename _Tp>
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struct __cxx_atomic_base_impl {
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_LIBCPP_HIDE_FROM_ABI
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#ifndef _LIBCPP_CXX03_LANG
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__cxx_atomic_base_impl() _NOEXCEPT = default;
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#else
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__cxx_atomic_base_impl() _NOEXCEPT : __a_value() {}
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#endif // _LIBCPP_CXX03_LANG
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_LIBCPP_CONSTEXPR explicit __cxx_atomic_base_impl(_Tp value) _NOEXCEPT
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: __a_value(value) {}
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_Tp __a_value;
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};
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_LIBCPP_HIDE_FROM_ABI inline _LIBCPP_CONSTEXPR int __to_gcc_order(memory_order __order) {
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// Avoid switch statement to make this a constexpr.
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return __order == memory_order_relaxed ? __ATOMIC_RELAXED:
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(__order == memory_order_acquire ? __ATOMIC_ACQUIRE:
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(__order == memory_order_release ? __ATOMIC_RELEASE:
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(__order == memory_order_seq_cst ? __ATOMIC_SEQ_CST:
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(__order == memory_order_acq_rel ? __ATOMIC_ACQ_REL:
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__ATOMIC_CONSUME))));
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}
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_LIBCPP_HIDE_FROM_ABI inline _LIBCPP_CONSTEXPR int __to_gcc_failure_order(memory_order __order) {
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// Avoid switch statement to make this a constexpr.
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return __order == memory_order_relaxed ? __ATOMIC_RELAXED:
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(__order == memory_order_acquire ? __ATOMIC_ACQUIRE:
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(__order == memory_order_release ? __ATOMIC_RELAXED:
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(__order == memory_order_seq_cst ? __ATOMIC_SEQ_CST:
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(__order == memory_order_acq_rel ? __ATOMIC_ACQUIRE:
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__ATOMIC_CONSUME))));
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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void __cxx_atomic_init(volatile __cxx_atomic_base_impl<_Tp>* __a, _Tp __val) {
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__cxx_atomic_assign_volatile(__a->__a_value, __val);
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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void __cxx_atomic_init(__cxx_atomic_base_impl<_Tp>* __a, _Tp __val) {
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__a->__a_value = __val;
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}
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_LIBCPP_HIDE_FROM_ABI inline
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void __cxx_atomic_thread_fence(memory_order __order) {
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__atomic_thread_fence(__to_gcc_order(__order));
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}
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_LIBCPP_HIDE_FROM_ABI inline
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void __cxx_atomic_signal_fence(memory_order __order) {
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__atomic_signal_fence(__to_gcc_order(__order));
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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void __cxx_atomic_store(volatile __cxx_atomic_base_impl<_Tp>* __a, _Tp __val,
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memory_order __order) {
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__atomic_store(std::addressof(__a->__a_value), std::addressof(__val), __to_gcc_order(__order));
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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void __cxx_atomic_store(__cxx_atomic_base_impl<_Tp>* __a, _Tp __val,
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memory_order __order) {
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__atomic_store(std::addressof(__a->__a_value), std::addressof(__val), __to_gcc_order(__order));
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_load(const volatile __cxx_atomic_base_impl<_Tp>* __a,
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memory_order __order) {
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_Tp __ret;
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__atomic_load(std::addressof(__a->__a_value), std::addressof(__ret), __to_gcc_order(__order));
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return __ret;
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_load(const __cxx_atomic_base_impl<_Tp>* __a, memory_order __order) {
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_Tp __ret;
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__atomic_load(std::addressof(__a->__a_value), std::addressof(__ret), __to_gcc_order(__order));
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return __ret;
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_exchange(volatile __cxx_atomic_base_impl<_Tp>* __a,
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_Tp __value, memory_order __order) {
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_Tp __ret;
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__atomic_exchange(
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std::addressof(__a->__a_value), std::addressof(__value), std::addressof(__ret), __to_gcc_order(__order));
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return __ret;
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_exchange(__cxx_atomic_base_impl<_Tp>* __a, _Tp __value,
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memory_order __order) {
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_Tp __ret;
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__atomic_exchange(
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std::addressof(__a->__a_value), std::addressof(__value), std::addressof(__ret), __to_gcc_order(__order));
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return __ret;
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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bool __cxx_atomic_compare_exchange_strong(
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volatile __cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value,
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memory_order __success, memory_order __failure) {
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return __atomic_compare_exchange(
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std::addressof(__a->__a_value),
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__expected,
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std::addressof(__value),
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false,
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__to_gcc_order(__success),
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__to_gcc_failure_order(__failure));
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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bool __cxx_atomic_compare_exchange_strong(
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__cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value, memory_order __success,
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memory_order __failure) {
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return __atomic_compare_exchange(
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std::addressof(__a->__a_value),
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__expected,
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std::addressof(__value),
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false,
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__to_gcc_order(__success),
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__to_gcc_failure_order(__failure));
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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bool __cxx_atomic_compare_exchange_weak(
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volatile __cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value,
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memory_order __success, memory_order __failure) {
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return __atomic_compare_exchange(
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std::addressof(__a->__a_value),
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__expected,
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std::addressof(__value),
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true,
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__to_gcc_order(__success),
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__to_gcc_failure_order(__failure));
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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bool __cxx_atomic_compare_exchange_weak(
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__cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value, memory_order __success,
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memory_order __failure) {
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return __atomic_compare_exchange(
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std::addressof(__a->__a_value),
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__expected,
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std::addressof(__value),
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true,
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__to_gcc_order(__success),
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__to_gcc_failure_order(__failure));
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}
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template <typename _Tp>
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struct __skip_amt { enum {value = 1}; };
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template <typename _Tp>
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struct __skip_amt<_Tp*> { enum {value = sizeof(_Tp)}; };
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// FIXME: Haven't figured out what the spec says about using arrays with
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// atomic_fetch_add. Force a failure rather than creating bad behavior.
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template <typename _Tp>
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struct __skip_amt<_Tp[]> { };
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template <typename _Tp, int n>
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struct __skip_amt<_Tp[n]> { };
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template <typename _Tp, typename _Td>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_fetch_add(volatile __cxx_atomic_base_impl<_Tp>* __a,
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_Td __delta, memory_order __order) {
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return __atomic_fetch_add(std::addressof(__a->__a_value), __delta * __skip_amt<_Tp>::value, __to_gcc_order(__order));
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}
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template <typename _Tp, typename _Td>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp>* __a, _Td __delta,
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memory_order __order) {
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return __atomic_fetch_add(std::addressof(__a->__a_value), __delta * __skip_amt<_Tp>::value, __to_gcc_order(__order));
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}
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template <typename _Tp, typename _Td>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_fetch_sub(volatile __cxx_atomic_base_impl<_Tp>* __a,
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_Td __delta, memory_order __order) {
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return __atomic_fetch_sub(std::addressof(__a->__a_value), __delta * __skip_amt<_Tp>::value, __to_gcc_order(__order));
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}
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template <typename _Tp, typename _Td>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp>* __a, _Td __delta,
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memory_order __order) {
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return __atomic_fetch_sub(std::addressof(__a->__a_value), __delta * __skip_amt<_Tp>::value, __to_gcc_order(__order));
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_fetch_and(volatile __cxx_atomic_base_impl<_Tp>* __a,
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_Tp __pattern, memory_order __order) {
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return __atomic_fetch_and(std::addressof(__a->__a_value), __pattern, __to_gcc_order(__order));
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_fetch_and(__cxx_atomic_base_impl<_Tp>* __a,
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_Tp __pattern, memory_order __order) {
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return __atomic_fetch_and(std::addressof(__a->__a_value), __pattern, __to_gcc_order(__order));
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_fetch_or(volatile __cxx_atomic_base_impl<_Tp>* __a,
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_Tp __pattern, memory_order __order) {
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return __atomic_fetch_or(std::addressof(__a->__a_value), __pattern, __to_gcc_order(__order));
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_fetch_or(__cxx_atomic_base_impl<_Tp>* __a, _Tp __pattern,
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memory_order __order) {
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return __atomic_fetch_or(std::addressof(__a->__a_value), __pattern, __to_gcc_order(__order));
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_fetch_xor(volatile __cxx_atomic_base_impl<_Tp>* __a,
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_Tp __pattern, memory_order __order) {
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return __atomic_fetch_xor(std::addressof(__a->__a_value), __pattern, __to_gcc_order(__order));
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}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_fetch_xor(__cxx_atomic_base_impl<_Tp>* __a, _Tp __pattern,
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memory_order __order) {
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return __atomic_fetch_xor(std::addressof(__a->__a_value), __pattern, __to_gcc_order(__order));
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}
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#define __cxx_atomic_is_lock_free(__s) __atomic_is_lock_free(__s, 0)
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#elif defined(_LIBCPP_HAS_C_ATOMIC_IMP)
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template <typename _Tp>
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struct __cxx_atomic_base_impl {
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_LIBCPP_HIDE_FROM_ABI
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#ifndef _LIBCPP_CXX03_LANG
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__cxx_atomic_base_impl() _NOEXCEPT = default;
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#else
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__cxx_atomic_base_impl() _NOEXCEPT : __a_value() {}
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#endif // _LIBCPP_CXX03_LANG
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_LIBCPP_CONSTEXPR explicit __cxx_atomic_base_impl(_Tp __value) _NOEXCEPT
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: __a_value(__value) {}
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_LIBCPP_DISABLE_EXTENSION_WARNING _Atomic(_Tp) __a_value;
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};
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#define __cxx_atomic_is_lock_free(__s) __c11_atomic_is_lock_free(__s)
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_LIBCPP_HIDE_FROM_ABI inline
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void __cxx_atomic_thread_fence(memory_order __order) _NOEXCEPT {
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__c11_atomic_thread_fence(static_cast<__memory_order_underlying_t>(__order));
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}
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_LIBCPP_HIDE_FROM_ABI inline
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void __cxx_atomic_signal_fence(memory_order __order) _NOEXCEPT {
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__c11_atomic_signal_fence(static_cast<__memory_order_underlying_t>(__order));
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}
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template<class _Tp>
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_LIBCPP_HIDE_FROM_ABI
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void __cxx_atomic_init(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __val) _NOEXCEPT {
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__c11_atomic_init(std::addressof(__a->__a_value), __val);
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}
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template<class _Tp>
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_LIBCPP_HIDE_FROM_ABI
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void __cxx_atomic_init(__cxx_atomic_base_impl<_Tp> * __a, _Tp __val) _NOEXCEPT {
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__c11_atomic_init(std::addressof(__a->__a_value), __val);
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}
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template<class _Tp>
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_LIBCPP_HIDE_FROM_ABI
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void __cxx_atomic_store(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __val, memory_order __order) _NOEXCEPT {
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__c11_atomic_store(std::addressof(__a->__a_value), __val, static_cast<__memory_order_underlying_t>(__order));
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}
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template<class _Tp>
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_LIBCPP_HIDE_FROM_ABI
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void __cxx_atomic_store(__cxx_atomic_base_impl<_Tp> * __a, _Tp __val, memory_order __order) _NOEXCEPT {
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__c11_atomic_store(std::addressof(__a->__a_value), __val, static_cast<__memory_order_underlying_t>(__order));
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}
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template<class _Tp>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_load(__cxx_atomic_base_impl<_Tp> const volatile* __a, memory_order __order) _NOEXCEPT {
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using __ptr_type = __remove_const_t<decltype(__a->__a_value)>*;
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return __c11_atomic_load(
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const_cast<__ptr_type>(std::addressof(__a->__a_value)), static_cast<__memory_order_underlying_t>(__order));
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}
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template<class _Tp>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_load(__cxx_atomic_base_impl<_Tp> const* __a, memory_order __order) _NOEXCEPT {
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using __ptr_type = __remove_const_t<decltype(__a->__a_value)>*;
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return __c11_atomic_load(
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const_cast<__ptr_type>(std::addressof(__a->__a_value)), static_cast<__memory_order_underlying_t>(__order));
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}
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template<class _Tp>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_exchange(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __value, memory_order __order) _NOEXCEPT {
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return __c11_atomic_exchange(
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std::addressof(__a->__a_value), __value, static_cast<__memory_order_underlying_t>(__order));
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}
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template<class _Tp>
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_LIBCPP_HIDE_FROM_ABI
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_Tp __cxx_atomic_exchange(__cxx_atomic_base_impl<_Tp> * __a, _Tp __value, memory_order __order) _NOEXCEPT {
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return __c11_atomic_exchange(
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std::addressof(__a->__a_value), __value, static_cast<__memory_order_underlying_t>(__order));
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}
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_LIBCPP_HIDE_FROM_ABI inline _LIBCPP_CONSTEXPR memory_order __to_failure_order(memory_order __order) {
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// Avoid switch statement to make this a constexpr.
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return __order == memory_order_release ? memory_order_relaxed:
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(__order == memory_order_acq_rel ? memory_order_acquire:
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__order);
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}
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template<class _Tp>
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_LIBCPP_HIDE_FROM_ABI
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bool __cxx_atomic_compare_exchange_strong(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) _NOEXCEPT {
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return __c11_atomic_compare_exchange_strong(
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std::addressof(__a->__a_value),
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__expected,
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__value,
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static_cast<__memory_order_underlying_t>(__success),
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static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
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}
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template<class _Tp>
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_LIBCPP_HIDE_FROM_ABI
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bool __cxx_atomic_compare_exchange_strong(__cxx_atomic_base_impl<_Tp> * __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) _NOEXCEPT {
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return __c11_atomic_compare_exchange_strong(
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std::addressof(__a->__a_value),
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__expected,
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__value,
|
|
static_cast<__memory_order_underlying_t>(__success),
|
|
static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
|
|
}
|
|
|
|
template<class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
bool __cxx_atomic_compare_exchange_weak(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) _NOEXCEPT {
|
|
return __c11_atomic_compare_exchange_weak(
|
|
std::addressof(__a->__a_value),
|
|
__expected,
|
|
__value,
|
|
static_cast<__memory_order_underlying_t>(__success),
|
|
static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
|
|
}
|
|
template<class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
bool __cxx_atomic_compare_exchange_weak(__cxx_atomic_base_impl<_Tp> * __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure) _NOEXCEPT {
|
|
return __c11_atomic_compare_exchange_weak(
|
|
std::addressof(__a->__a_value),
|
|
__expected,
|
|
__value,
|
|
static_cast<__memory_order_underlying_t>(__success),
|
|
static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
|
|
}
|
|
|
|
template<class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __delta, memory_order __order) _NOEXCEPT {
|
|
return __c11_atomic_fetch_add(
|
|
std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
|
|
}
|
|
template<class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp> * __a, _Tp __delta, memory_order __order) _NOEXCEPT {
|
|
return __c11_atomic_fetch_add(
|
|
std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
|
|
}
|
|
|
|
template<class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp* __cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp*> volatile* __a, ptrdiff_t __delta, memory_order __order) _NOEXCEPT {
|
|
return __c11_atomic_fetch_add(
|
|
std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
|
|
}
|
|
template<class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp* __cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp*> * __a, ptrdiff_t __delta, memory_order __order) _NOEXCEPT {
|
|
return __c11_atomic_fetch_add(
|
|
std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
|
|
}
|
|
|
|
template<class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __delta, memory_order __order) _NOEXCEPT {
|
|
return __c11_atomic_fetch_sub(
|
|
std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
|
|
}
|
|
template<class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp> * __a, _Tp __delta, memory_order __order) _NOEXCEPT {
|
|
return __c11_atomic_fetch_sub(
|
|
std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
|
|
}
|
|
template<class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp* __cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp*> volatile* __a, ptrdiff_t __delta, memory_order __order) _NOEXCEPT {
|
|
return __c11_atomic_fetch_sub(
|
|
std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
|
|
}
|
|
template<class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp* __cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp*> * __a, ptrdiff_t __delta, memory_order __order) _NOEXCEPT {
|
|
return __c11_atomic_fetch_sub(
|
|
std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
|
|
}
|
|
|
|
template<class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_and(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
|
|
return __c11_atomic_fetch_and(
|
|
std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
|
|
}
|
|
template<class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_and(__cxx_atomic_base_impl<_Tp> * __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
|
|
return __c11_atomic_fetch_and(
|
|
std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
|
|
}
|
|
|
|
template<class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_or(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
|
|
return __c11_atomic_fetch_or(
|
|
std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
|
|
}
|
|
template<class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_or(__cxx_atomic_base_impl<_Tp> * __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
|
|
return __c11_atomic_fetch_or(
|
|
std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
|
|
}
|
|
|
|
template<class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_xor(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
|
|
return __c11_atomic_fetch_xor(
|
|
std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
|
|
}
|
|
template<class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_xor(__cxx_atomic_base_impl<_Tp> * __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
|
|
return __c11_atomic_fetch_xor(
|
|
std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
|
|
}
|
|
|
|
#endif // _LIBCPP_HAS_GCC_ATOMIC_IMP, _LIBCPP_HAS_C_ATOMIC_IMP
|
|
|
|
#ifdef _LIBCPP_ATOMIC_ONLY_USE_BUILTINS
|
|
|
|
template<typename _Tp>
|
|
struct __cxx_atomic_lock_impl {
|
|
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
__cxx_atomic_lock_impl() _NOEXCEPT
|
|
: __a_value(), __a_lock(0) {}
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR explicit
|
|
__cxx_atomic_lock_impl(_Tp value) _NOEXCEPT
|
|
: __a_value(value), __a_lock(0) {}
|
|
|
|
_Tp __a_value;
|
|
mutable __cxx_atomic_base_impl<_LIBCPP_ATOMIC_FLAG_TYPE> __a_lock;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI void __lock() const volatile {
|
|
while(1 == __cxx_atomic_exchange(&__a_lock, _LIBCPP_ATOMIC_FLAG_TYPE(true), memory_order_acquire))
|
|
/*spin*/;
|
|
}
|
|
_LIBCPP_HIDE_FROM_ABI void __lock() const {
|
|
while(1 == __cxx_atomic_exchange(&__a_lock, _LIBCPP_ATOMIC_FLAG_TYPE(true), memory_order_acquire))
|
|
/*spin*/;
|
|
}
|
|
_LIBCPP_HIDE_FROM_ABI void __unlock() const volatile {
|
|
__cxx_atomic_store(&__a_lock, _LIBCPP_ATOMIC_FLAG_TYPE(false), memory_order_release);
|
|
}
|
|
_LIBCPP_HIDE_FROM_ABI void __unlock() const {
|
|
__cxx_atomic_store(&__a_lock, _LIBCPP_ATOMIC_FLAG_TYPE(false), memory_order_release);
|
|
}
|
|
_LIBCPP_HIDE_FROM_ABI _Tp __read() const volatile {
|
|
__lock();
|
|
_Tp __old;
|
|
__cxx_atomic_assign_volatile(__old, __a_value);
|
|
__unlock();
|
|
return __old;
|
|
}
|
|
_LIBCPP_HIDE_FROM_ABI _Tp __read() const {
|
|
__lock();
|
|
_Tp __old = __a_value;
|
|
__unlock();
|
|
return __old;
|
|
}
|
|
};
|
|
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
void __cxx_atomic_init(volatile __cxx_atomic_lock_impl<_Tp>* __a, _Tp __val) {
|
|
__cxx_atomic_assign_volatile(__a->__a_value, __val);
|
|
}
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
void __cxx_atomic_init(__cxx_atomic_lock_impl<_Tp>* __a, _Tp __val) {
|
|
__a->__a_value = __val;
|
|
}
|
|
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
void __cxx_atomic_store(volatile __cxx_atomic_lock_impl<_Tp>* __a, _Tp __val, memory_order) {
|
|
__a->__lock();
|
|
__cxx_atomic_assign_volatile(__a->__a_value, __val);
|
|
__a->__unlock();
|
|
}
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
void __cxx_atomic_store(__cxx_atomic_lock_impl<_Tp>* __a, _Tp __val, memory_order) {
|
|
__a->__lock();
|
|
__a->__a_value = __val;
|
|
__a->__unlock();
|
|
}
|
|
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_load(const volatile __cxx_atomic_lock_impl<_Tp>* __a, memory_order) {
|
|
return __a->__read();
|
|
}
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_load(const __cxx_atomic_lock_impl<_Tp>* __a, memory_order) {
|
|
return __a->__read();
|
|
}
|
|
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_exchange(volatile __cxx_atomic_lock_impl<_Tp>* __a, _Tp __value, memory_order) {
|
|
__a->__lock();
|
|
_Tp __old;
|
|
__cxx_atomic_assign_volatile(__old, __a->__a_value);
|
|
__cxx_atomic_assign_volatile(__a->__a_value, __value);
|
|
__a->__unlock();
|
|
return __old;
|
|
}
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_exchange(__cxx_atomic_lock_impl<_Tp>* __a, _Tp __value, memory_order) {
|
|
__a->__lock();
|
|
_Tp __old = __a->__a_value;
|
|
__a->__a_value = __value;
|
|
__a->__unlock();
|
|
return __old;
|
|
}
|
|
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
bool __cxx_atomic_compare_exchange_strong(volatile __cxx_atomic_lock_impl<_Tp>* __a,
|
|
_Tp* __expected, _Tp __value, memory_order, memory_order) {
|
|
_Tp __temp;
|
|
__a->__lock();
|
|
__cxx_atomic_assign_volatile(__temp, __a->__a_value);
|
|
bool __ret = (std::memcmp(&__temp, __expected, sizeof(_Tp)) == 0);
|
|
if(__ret)
|
|
__cxx_atomic_assign_volatile(__a->__a_value, __value);
|
|
else
|
|
__cxx_atomic_assign_volatile(*__expected, __a->__a_value);
|
|
__a->__unlock();
|
|
return __ret;
|
|
}
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
bool __cxx_atomic_compare_exchange_strong(__cxx_atomic_lock_impl<_Tp>* __a,
|
|
_Tp* __expected, _Tp __value, memory_order, memory_order) {
|
|
__a->__lock();
|
|
bool __ret = (std::memcmp(&__a->__a_value, __expected, sizeof(_Tp)) == 0);
|
|
if(__ret)
|
|
std::memcpy(&__a->__a_value, &__value, sizeof(_Tp));
|
|
else
|
|
std::memcpy(__expected, &__a->__a_value, sizeof(_Tp));
|
|
__a->__unlock();
|
|
return __ret;
|
|
}
|
|
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
bool __cxx_atomic_compare_exchange_weak(volatile __cxx_atomic_lock_impl<_Tp>* __a,
|
|
_Tp* __expected, _Tp __value, memory_order, memory_order) {
|
|
_Tp __temp;
|
|
__a->__lock();
|
|
__cxx_atomic_assign_volatile(__temp, __a->__a_value);
|
|
bool __ret = (std::memcmp(&__temp, __expected, sizeof(_Tp)) == 0);
|
|
if(__ret)
|
|
__cxx_atomic_assign_volatile(__a->__a_value, __value);
|
|
else
|
|
__cxx_atomic_assign_volatile(*__expected, __a->__a_value);
|
|
__a->__unlock();
|
|
return __ret;
|
|
}
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
bool __cxx_atomic_compare_exchange_weak(__cxx_atomic_lock_impl<_Tp>* __a,
|
|
_Tp* __expected, _Tp __value, memory_order, memory_order) {
|
|
__a->__lock();
|
|
bool __ret = (std::memcmp(&__a->__a_value, __expected, sizeof(_Tp)) == 0);
|
|
if(__ret)
|
|
std::memcpy(&__a->__a_value, &__value, sizeof(_Tp));
|
|
else
|
|
std::memcpy(__expected, &__a->__a_value, sizeof(_Tp));
|
|
__a->__unlock();
|
|
return __ret;
|
|
}
|
|
|
|
template <typename _Tp, typename _Td>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_add(volatile __cxx_atomic_lock_impl<_Tp>* __a,
|
|
_Td __delta, memory_order) {
|
|
__a->__lock();
|
|
_Tp __old;
|
|
__cxx_atomic_assign_volatile(__old, __a->__a_value);
|
|
__cxx_atomic_assign_volatile(__a->__a_value, _Tp(__old + __delta));
|
|
__a->__unlock();
|
|
return __old;
|
|
}
|
|
template <typename _Tp, typename _Td>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_add(__cxx_atomic_lock_impl<_Tp>* __a,
|
|
_Td __delta, memory_order) {
|
|
__a->__lock();
|
|
_Tp __old = __a->__a_value;
|
|
__a->__a_value += __delta;
|
|
__a->__unlock();
|
|
return __old;
|
|
}
|
|
|
|
template <typename _Tp, typename _Td>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp* __cxx_atomic_fetch_add(volatile __cxx_atomic_lock_impl<_Tp*>* __a,
|
|
ptrdiff_t __delta, memory_order) {
|
|
__a->__lock();
|
|
_Tp* __old;
|
|
__cxx_atomic_assign_volatile(__old, __a->__a_value);
|
|
__cxx_atomic_assign_volatile(__a->__a_value, __old + __delta);
|
|
__a->__unlock();
|
|
return __old;
|
|
}
|
|
template <typename _Tp, typename _Td>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp* __cxx_atomic_fetch_add(__cxx_atomic_lock_impl<_Tp*>* __a,
|
|
ptrdiff_t __delta, memory_order) {
|
|
__a->__lock();
|
|
_Tp* __old = __a->__a_value;
|
|
__a->__a_value += __delta;
|
|
__a->__unlock();
|
|
return __old;
|
|
}
|
|
|
|
template <typename _Tp, typename _Td>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_sub(volatile __cxx_atomic_lock_impl<_Tp>* __a,
|
|
_Td __delta, memory_order) {
|
|
__a->__lock();
|
|
_Tp __old;
|
|
__cxx_atomic_assign_volatile(__old, __a->__a_value);
|
|
__cxx_atomic_assign_volatile(__a->__a_value, _Tp(__old - __delta));
|
|
__a->__unlock();
|
|
return __old;
|
|
}
|
|
template <typename _Tp, typename _Td>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_sub(__cxx_atomic_lock_impl<_Tp>* __a,
|
|
_Td __delta, memory_order) {
|
|
__a->__lock();
|
|
_Tp __old = __a->__a_value;
|
|
__a->__a_value -= __delta;
|
|
__a->__unlock();
|
|
return __old;
|
|
}
|
|
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_and(volatile __cxx_atomic_lock_impl<_Tp>* __a,
|
|
_Tp __pattern, memory_order) {
|
|
__a->__lock();
|
|
_Tp __old;
|
|
__cxx_atomic_assign_volatile(__old, __a->__a_value);
|
|
__cxx_atomic_assign_volatile(__a->__a_value, _Tp(__old & __pattern));
|
|
__a->__unlock();
|
|
return __old;
|
|
}
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_and(__cxx_atomic_lock_impl<_Tp>* __a,
|
|
_Tp __pattern, memory_order) {
|
|
__a->__lock();
|
|
_Tp __old = __a->__a_value;
|
|
__a->__a_value &= __pattern;
|
|
__a->__unlock();
|
|
return __old;
|
|
}
|
|
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_or(volatile __cxx_atomic_lock_impl<_Tp>* __a,
|
|
_Tp __pattern, memory_order) {
|
|
__a->__lock();
|
|
_Tp __old;
|
|
__cxx_atomic_assign_volatile(__old, __a->__a_value);
|
|
__cxx_atomic_assign_volatile(__a->__a_value, _Tp(__old | __pattern));
|
|
__a->__unlock();
|
|
return __old;
|
|
}
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_or(__cxx_atomic_lock_impl<_Tp>* __a,
|
|
_Tp __pattern, memory_order) {
|
|
__a->__lock();
|
|
_Tp __old = __a->__a_value;
|
|
__a->__a_value |= __pattern;
|
|
__a->__unlock();
|
|
return __old;
|
|
}
|
|
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_xor(volatile __cxx_atomic_lock_impl<_Tp>* __a,
|
|
_Tp __pattern, memory_order) {
|
|
__a->__lock();
|
|
_Tp __old;
|
|
__cxx_atomic_assign_volatile(__old, __a->__a_value);
|
|
__cxx_atomic_assign_volatile(__a->__a_value, _Tp(__old ^ __pattern));
|
|
__a->__unlock();
|
|
return __old;
|
|
}
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
_Tp __cxx_atomic_fetch_xor(__cxx_atomic_lock_impl<_Tp>* __a,
|
|
_Tp __pattern, memory_order) {
|
|
__a->__lock();
|
|
_Tp __old = __a->__a_value;
|
|
__a->__a_value ^= __pattern;
|
|
__a->__unlock();
|
|
return __old;
|
|
}
|
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template <typename _Tp,
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typename _Base = typename conditional<__libcpp_is_always_lock_free<_Tp>::__value,
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__cxx_atomic_base_impl<_Tp>,
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__cxx_atomic_lock_impl<_Tp> >::type>
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#else
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template <typename _Tp,
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typename _Base = __cxx_atomic_base_impl<_Tp> >
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#endif //_LIBCPP_ATOMIC_ONLY_USE_BUILTINS
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struct __cxx_atomic_impl : public _Base {
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static_assert(is_trivially_copyable<_Tp>::value,
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"std::atomic<T> requires that 'T' be a trivially copyable type");
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_LIBCPP_HIDE_FROM_ABI __cxx_atomic_impl() _NOEXCEPT = default;
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR explicit __cxx_atomic_impl(_Tp __value) _NOEXCEPT
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: _Base(__value) {}
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};
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ATOMIC_CXX_ATOMIC_IMPL_H
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