整理

2026-03-23 20:54:41 +08:00
commit e13b3650e9
4596 changed files with 1015768 additions and 0 deletions
--- a/include/boost/atomic/detail/fp_ops_emulated.hpp
+++ b/include/boost/atomic/detail/fp_ops_emulated.hpp
@@ -0,0 +1,77 @@
+/*
+ * 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) 2018-2025 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/header.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+namespace atomics {
+namespace detail {
+
+//! Emulated implementation of floating point operations
+template< typename Base, typename Value, std::size_t Size >
+struct fp_operations_emulated :
+    public Base
+{
+    using base_type = Base;
+    using storage_type = typename base_type::storage_type;
+    using value_type = Value;
+    using scoped_lock = typename base_type::scoped_lock;
+
+    static value_type fetch_add(storage_type volatile& storage, value_type v, memory_order) noexcept
+    {
+        static_assert(!base_type::is_interprocess, "Boost.Atomic: operation invoked on a non-lock-free inter-process atomic object");
+        storage_type& s = const_cast< storage_type& >(storage);
+        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 value_type fetch_sub(storage_type volatile& storage, value_type v, memory_order) noexcept
+    {
+        static_assert(!base_type::is_interprocess, "Boost.Atomic: operation invoked on a non-lock-free inter-process atomic object");
+        storage_type& s = const_cast< storage_type& >(storage);
+        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 fp_operations_emulated< Base, Value, Size >
+{
+};
+
+} // namespace detail
+} // namespace atomics
+} // namespace boost
+
+#include <boost/atomic/detail/footer.hpp>
+
+#endif // BOOST_ATOMIC_DETAIL_FP_OPS_EMULATED_HPP_INCLUDED_