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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) 2018 Andrey Semashev
+ */
+/*!
+ * \file atomic/detail/extra_fp_ops_emulated.hpp
+ *
+ * This header contains emulated (lock-based) implementation of the extra floating point atomic operations.
+ */
+
+#ifndef BOOST_ATOMIC_DETAIL_EXTRA_FP_OPS_EMULATED_HPP_INCLUDED_
+#define BOOST_ATOMIC_DETAIL_EXTRA_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/extra_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 extra floating point operations
+template< typename Base, typename Value, std::size_t Size >
+struct emulated_extra_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_negate(storage_type volatile& storage, 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;
+ s = atomics::detail::bitwise_fp_cast< storage_type >(new_val);
+ return old_val;
+ }
+
+ static BOOST_FORCEINLINE value_type negate(storage_type volatile& storage, 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;
+ s = atomics::detail::bitwise_fp_cast< storage_type >(new_val);
+ return new_val;
+ }
+
+ static BOOST_FORCEINLINE value_type 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 new_val;
+ }
+
+ static BOOST_FORCEINLINE value_type 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 new_val;
+ }
+
+ static BOOST_FORCEINLINE void opaque_negate(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
+ {
+ fetch_negate(storage, order);
+ }
+
+ static BOOST_FORCEINLINE void opaque_add(storage_type volatile& storage, value_type v, memory_order order) BOOST_NOEXCEPT
+ {
+ base_type::fetch_add(storage, v, order);
+ }
+
+ static BOOST_FORCEINLINE void opaque_sub(storage_type volatile& storage, value_type v, memory_order order) BOOST_NOEXCEPT
+ {
+ base_type::fetch_sub(storage, v, order);
+ }
+};
+
+template< typename Base, typename Value, std::size_t Size >
+struct extra_fp_operations< Base, Value, Size, false > :
+ public emulated_extra_fp_operations< Base, Value, Size >
+{
+};
+
+} // namespace detail
+} // namespace atomics
+} // namespace boost
+
+#endif // BOOST_ATOMIC_DETAIL_EXTRA_FP_OPS_EMULATED_HPP_INCLUDED_