/*
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* Copyright (c) 2020 Andrey Semashev
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*/
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/*!
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* \file atomic/detail/wait_ops_windows.hpp
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*
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* This header contains implementation of the waiting/notifying atomic operations on Windows.
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*/
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#ifndef BOOST_ATOMIC_DETAIL_WAIT_OPS_WINDOWS_HPP_INCLUDED_
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#define BOOST_ATOMIC_DETAIL_WAIT_OPS_WINDOWS_HPP_INCLUDED_
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#include <cstddef>
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#include <boost/static_assert.hpp>
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#include <boost/memory_order.hpp>
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#include <boost/winapi/basic_types.hpp>
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#include <boost/winapi/wait_constants.hpp>
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#include <boost/atomic/detail/config.hpp>
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#include <boost/atomic/detail/link.hpp>
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#include <boost/atomic/detail/once_flag.hpp>
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#include <boost/atomic/detail/wait_operations_fwd.hpp>
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#include <boost/atomic/detail/wait_ops_generic.hpp>
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#include <boost/atomic/detail/header.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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namespace boost {
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namespace atomics {
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namespace detail {
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typedef boost::winapi::BOOL_ BOOST_WINAPI_WINAPI_CC
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wait_on_address_t(
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volatile boost::winapi::VOID_* addr,
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boost::winapi::PVOID_ compare_addr,
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boost::winapi::SIZE_T_ size,
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boost::winapi::DWORD_ timeout_ms);
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typedef boost::winapi::VOID_ BOOST_WINAPI_WINAPI_CC
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wake_by_address_t(boost::winapi::PVOID_ addr);
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extern BOOST_ATOMIC_DECL wait_on_address_t* wait_on_address;
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extern BOOST_ATOMIC_DECL wake_by_address_t* wake_by_address_single;
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extern BOOST_ATOMIC_DECL wake_by_address_t* wake_by_address_all;
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extern BOOST_ATOMIC_DECL once_flag wait_functions_once_flag;
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BOOST_ATOMIC_DECL void initialize_wait_functions() BOOST_NOEXCEPT;
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BOOST_FORCEINLINE void ensure_wait_functions_initialized() BOOST_NOEXCEPT
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{
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BOOST_STATIC_ASSERT_MSG(once_flag_operations::is_always_lock_free, "Boost.Atomic unsupported target platform: native atomic operations not implemented for bytes");
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if (BOOST_LIKELY(once_flag_operations::load(wait_functions_once_flag.m_flag, boost::memory_order_acquire) == 0u))
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return;
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initialize_wait_functions();
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}
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template< typename Base, std::size_t Size >
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struct wait_operations_windows :
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public atomics::detail::wait_operations_generic< Base, false >
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{
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typedef atomics::detail::wait_operations_generic< Base, false > base_type;
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typedef typename base_type::storage_type storage_type;
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static BOOST_CONSTEXPR_OR_CONST bool always_has_native_wait_notify = false;
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static BOOST_FORCEINLINE bool has_native_wait_notify(storage_type const volatile&) BOOST_NOEXCEPT
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{
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ensure_wait_functions_initialized();
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return atomics::detail::wait_on_address != NULL;
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}
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static BOOST_FORCEINLINE storage_type wait(storage_type const volatile& storage, storage_type old_val, memory_order order) BOOST_NOEXCEPT
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{
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ensure_wait_functions_initialized();
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if (BOOST_LIKELY(atomics::detail::wait_on_address != NULL))
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{
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storage_type new_val = base_type::load(storage, order);
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while (new_val == old_val)
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{
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atomics::detail::wait_on_address(const_cast< storage_type* >(&storage), &old_val, Size, boost::winapi::infinite);
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new_val = base_type::load(storage, order);
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}
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return new_val;
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}
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else
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{
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return base_type::wait(storage, old_val, order);
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}
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}
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static BOOST_FORCEINLINE void notify_one(storage_type volatile& storage) BOOST_NOEXCEPT
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{
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ensure_wait_functions_initialized();
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if (BOOST_LIKELY(atomics::detail::wake_by_address_single != NULL))
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atomics::detail::wake_by_address_single(const_cast< storage_type* >(&storage));
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else
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base_type::notify_one(storage);
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}
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static BOOST_FORCEINLINE void notify_all(storage_type volatile& storage) BOOST_NOEXCEPT
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{
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ensure_wait_functions_initialized();
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if (BOOST_LIKELY(atomics::detail::wake_by_address_all != NULL))
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atomics::detail::wake_by_address_all(const_cast< storage_type* >(&storage));
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else
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base_type::notify_all(storage);
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}
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};
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template< typename Base >
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struct wait_operations< Base, 1u, true, false > :
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public wait_operations_windows< Base, 1u >
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{
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};
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template< typename Base >
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struct wait_operations< Base, 2u, true, false > :
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public wait_operations_windows< Base, 2u >
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{
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};
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template< typename Base >
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struct wait_operations< Base, 4u, true, false > :
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public wait_operations_windows< Base, 4u >
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{
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};
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template< typename Base >
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struct wait_operations< Base, 8u, true, false > :
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public wait_operations_windows< Base, 8u >
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{
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};
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} // namespace detail
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} // namespace atomics
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} // namespace boost
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#include <boost/atomic/detail/footer.hpp>
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#endif // BOOST_ATOMIC_DETAIL_WAIT_OPS_WINDOWS_HPP_INCLUDED_
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