71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
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/*
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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) 2014 Andrey Semashev
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*/
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/*!
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* \file atomic/detail/atomic_flag.hpp
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*
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* This header contains interface definition of \c atomic_flag.
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*/
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#ifndef BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_HPP_INCLUDED_
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#define BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_HPP_INCLUDED_
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#include <boost/assert.hpp>
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#include <boost/memory_order.hpp>
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#include <boost/atomic/detail/config.hpp>
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#include <boost/atomic/detail/operations_lockfree.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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/*
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* IMPLEMENTATION NOTE: All interface functions MUST be declared with BOOST_FORCEINLINE,
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* see comment for convert_memory_order_to_gcc in ops_gcc_atomic.hpp.
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*/
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namespace boost {
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namespace atomics {
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#if defined(BOOST_NO_CXX11_CONSTEXPR) || defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX)
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#define BOOST_ATOMIC_NO_ATOMIC_FLAG_INIT
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#else
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#define BOOST_ATOMIC_FLAG_INIT {}
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#endif
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struct atomic_flag
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{
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typedef atomics::detail::operations< 1u, false > operations;
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typedef operations::storage_type storage_type;
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operations::aligned_storage_type m_storage;
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BOOST_FORCEINLINE BOOST_CONSTEXPR atomic_flag() BOOST_NOEXCEPT : m_storage(0)
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{
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}
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BOOST_FORCEINLINE bool test_and_set(memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
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{
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return operations::test_and_set(m_storage.value, order);
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}
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BOOST_FORCEINLINE void clear(memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
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{
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BOOST_ASSERT(order != memory_order_acquire);
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BOOST_ASSERT(order != memory_order_acq_rel);
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operations::clear(m_storage.value, order);
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}
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BOOST_DELETED_FUNCTION(atomic_flag(atomic_flag const&))
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BOOST_DELETED_FUNCTION(atomic_flag& operator= (atomic_flag const&))
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};
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} // namespace atomics
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} // namespace boost
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#endif // BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_HPP_INCLUDED_
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