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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;
- operations::aligned_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.value, order);
- }
- BOOST_FORCEINLINE void clear(memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
- {
- BOOST_ASSERT(order != memory_order_consume);
- BOOST_ASSERT(order != memory_order_acquire);
- BOOST_ASSERT(order != memory_order_acq_rel);
- operations::clear(m_storage.value, 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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