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/*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*
* Copyright (c) 2014 Andrey Semashev
*/
/*!
* \file atomic/detail/atomic_flag.hpp
*
* This header contains interface definition of \c atomic_flag.
*/
#ifndef BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_HPP_INCLUDED_
#define BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_HPP_INCLUDED_
#include <boost/assert.hpp>
#include <boost/memory_order.hpp>
#include <boost/atomic/detail/config.hpp>
#include <boost/atomic/detail/operations_lockfree.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
/*
* IMPLEMENTATION NOTE: All interface functions MUST be declared with BOOST_FORCEINLINE,
* see comment for convert_memory_order_to_gcc in ops_gcc_atomic.hpp.
*/
namespace boost {
namespace atomics {
#if defined(BOOST_NO_CXX11_CONSTEXPR) || defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX)
#define BOOST_ATOMIC_NO_ATOMIC_FLAG_INIT
#else
#define BOOST_ATOMIC_FLAG_INIT {}
#endif
struct atomic_flag
{
typedef atomics::detail::operations< 1u, false > operations;
typedef operations::storage_type storage_type;
storage_type m_storage;
BOOST_FORCEINLINE BOOST_CONSTEXPR atomic_flag() BOOST_NOEXCEPT : m_storage(0)
{
}
BOOST_FORCEINLINE bool test_and_set(memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
{
return operations::test_and_set(m_storage, order);
}
BOOST_FORCEINLINE void clear(memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
{
BOOST_ASSERT(order != memory_order_acquire);
BOOST_ASSERT(order != memory_order_acq_rel);
operations::clear(m_storage, order);
}
BOOST_DELETED_FUNCTION(atomic_flag(atomic_flag const&))
BOOST_DELETED_FUNCTION(atomic_flag& operator= (atomic_flag const&))
};
} // namespace atomics
} // namespace boost
#endif // BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_HPP_INCLUDED_
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