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Diffstat (limited to 'boost/atomic/detail/fp_ops_emulated.hpp')
-rw-r--r-- | boost/atomic/detail/fp_ops_emulated.hpp | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/boost/atomic/detail/fp_ops_emulated.hpp b/boost/atomic/detail/fp_ops_emulated.hpp new file mode 100644 index 0000000000..a87f1814b3 --- /dev/null +++ b/boost/atomic/detail/fp_ops_emulated.hpp @@ -0,0 +1,72 @@ +/* + * 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) 2018 Andrey Semashev + */ +/*! + * \file atomic/detail/fp_ops_emulated.hpp + * + * This header contains emulated (lock-based) implementation of the floating point atomic operations. + */ + +#ifndef BOOST_ATOMIC_DETAIL_FP_OPS_EMULATED_HPP_INCLUDED_ +#define BOOST_ATOMIC_DETAIL_FP_OPS_EMULATED_HPP_INCLUDED_ + +#include <cstddef> +#include <boost/memory_order.hpp> +#include <boost/atomic/detail/config.hpp> +#include <boost/atomic/detail/bitwise_fp_cast.hpp> +#include <boost/atomic/detail/fp_operations_fwd.hpp> +#include <boost/atomic/detail/lockpool.hpp> + +#ifdef BOOST_HAS_PRAGMA_ONCE +#pragma once +#endif + +namespace boost { +namespace atomics { +namespace detail { + +//! Generic implementation of floating point operations +template< typename Base, typename Value, std::size_t Size > +struct emulated_fp_operations : + public Base +{ + typedef Base base_type; + typedef typename base_type::storage_type storage_type; + typedef Value value_type; + + static BOOST_FORCEINLINE value_type fetch_add(storage_type volatile& storage, value_type v, memory_order) BOOST_NOEXCEPT + { + storage_type& s = const_cast< storage_type& >(storage); + lockpool::scoped_lock lock(&storage); + value_type old_val = atomics::detail::bitwise_fp_cast< value_type >(s); + value_type new_val = old_val + v; + s = atomics::detail::bitwise_fp_cast< storage_type >(new_val); + return old_val; + } + + static BOOST_FORCEINLINE value_type fetch_sub(storage_type volatile& storage, value_type v, memory_order) BOOST_NOEXCEPT + { + storage_type& s = const_cast< storage_type& >(storage); + lockpool::scoped_lock lock(&storage); + value_type old_val = atomics::detail::bitwise_fp_cast< value_type >(s); + value_type new_val = old_val - v; + s = atomics::detail::bitwise_fp_cast< storage_type >(new_val); + return old_val; + } +}; + +template< typename Base, typename Value, std::size_t Size > +struct fp_operations< Base, Value, Size, false > : + public emulated_fp_operations< Base, Value, Size > +{ +}; + +} // namespace detail +} // namespace atomics +} // namespace boost + +#endif // BOOST_ATOMIC_DETAIL_FP_OPS_EMULATED_HPP_INCLUDED_ |