Chris@102: /*
Chris@102:  * Distributed under the Boost Software License, Version 1.0.
Chris@102:  * (See accompanying file LICENSE_1_0.txt or copy at
Chris@102:  * http://www.boost.org/LICENSE_1_0.txt)
Chris@102:  *
Chris@102:  * Copyright (c) 2014 Andrey Semashev
Chris@102:  */
Chris@102: /*!
Chris@102:  * \file   atomic/detail/atomic_flag.hpp
Chris@102:  *
Chris@102:  * This header contains interface definition of \c atomic_flag.
Chris@102:  */
Chris@102: 
Chris@102: #ifndef BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_HPP_INCLUDED_
Chris@102: #define BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_HPP_INCLUDED_
Chris@102: 
Chris@102: #include <boost/assert.hpp>
Chris@102: #include <boost/memory_order.hpp>
Chris@102: #include <boost/atomic/detail/config.hpp>
Chris@102: #include <boost/atomic/detail/operations_lockfree.hpp>
Chris@102: 
Chris@102: #ifdef BOOST_HAS_PRAGMA_ONCE
Chris@102: #pragma once
Chris@102: #endif
Chris@102: 
Chris@102: /*
Chris@102:  * IMPLEMENTATION NOTE: All interface functions MUST be declared with BOOST_FORCEINLINE,
Chris@102:  *                      see comment for convert_memory_order_to_gcc in ops_gcc_atomic.hpp.
Chris@102:  */
Chris@102: 
Chris@102: namespace boost {
Chris@102: namespace atomics {
Chris@102: 
Chris@102: #if defined(BOOST_NO_CXX11_CONSTEXPR) || defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX)
Chris@102: #define BOOST_ATOMIC_NO_ATOMIC_FLAG_INIT
Chris@102: #else
Chris@102: #define BOOST_ATOMIC_FLAG_INIT {}
Chris@102: #endif
Chris@102: 
Chris@102: struct atomic_flag
Chris@102: {
Chris@102:     typedef atomics::detail::operations< 1u, false > operations;
Chris@102:     typedef operations::storage_type storage_type;
Chris@102: 
Chris@102:     storage_type m_storage;
Chris@102: 
Chris@102:     BOOST_FORCEINLINE BOOST_CONSTEXPR atomic_flag() BOOST_NOEXCEPT : m_storage(0)
Chris@102:     {
Chris@102:     }
Chris@102: 
Chris@102:     BOOST_FORCEINLINE bool test_and_set(memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         return operations::test_and_set(m_storage, order);
Chris@102:     }
Chris@102: 
Chris@102:     BOOST_FORCEINLINE void clear(memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         BOOST_ASSERT(order != memory_order_acquire);
Chris@102:         BOOST_ASSERT(order != memory_order_acq_rel);
Chris@102:         operations::clear(m_storage, order);
Chris@102:     }
Chris@102: 
Chris@102:     BOOST_DELETED_FUNCTION(atomic_flag(atomic_flag const&))
Chris@102:     BOOST_DELETED_FUNCTION(atomic_flag& operator= (atomic_flag const&))
Chris@102: };
Chris@102: 
Chris@102: } // namespace atomics
Chris@102: } // namespace boost
Chris@102: 
Chris@102: #endif // BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_HPP_INCLUDED_