/*
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* Copyright Andrey Semashev 2007 - 2015.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*/
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/*!
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* \file thread_specific.hpp
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* \author Andrey Semashev
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* \date 01.03.2008
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*
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* \brief This header is the Boost.Log library implementation, see the library documentation
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* at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
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*/
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#ifndef BOOST_LOG_DETAIL_THREAD_SPECIFIC_HPP_INCLUDED_
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#define BOOST_LOG_DETAIL_THREAD_SPECIFIC_HPP_INCLUDED_
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#include <boost/static_assert.hpp>
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#include <boost/type_traits/is_pod.hpp>
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#include <boost/log/detail/config.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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#if !defined(BOOST_LOG_NO_THREADS)
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#include <boost/log/detail/header.hpp>
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namespace boost {
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BOOST_LOG_OPEN_NAMESPACE
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namespace aux {
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//! Base class for TLS to hide platform-specific storage management
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class thread_specific_base
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{
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private:
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#if defined(BOOST_THREAD_PLATFORM_WIN32)
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typedef unsigned long key_storage;
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#else
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typedef void* key_storage;
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#endif
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key_storage m_Key;
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protected:
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BOOST_LOG_API thread_specific_base();
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BOOST_LOG_API ~thread_specific_base();
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BOOST_LOG_API void* get_content() const;
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BOOST_LOG_API void set_content(void* value) const;
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// Copying prohibited
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BOOST_DELETED_FUNCTION(thread_specific_base(thread_specific_base const&))
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BOOST_DELETED_FUNCTION(thread_specific_base& operator= (thread_specific_base const&))
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};
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//! A TLS wrapper for small POD types with least possible overhead
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template< typename T >
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class thread_specific :
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public thread_specific_base
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{
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BOOST_STATIC_ASSERT_MSG(sizeof(T) <= sizeof(void*) && is_pod< T >::value, "Boost.Log: Thread-specific values must be PODs and must not exceed the size of a pointer");
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//! Union to perform type casting
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union value_storage
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{
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void* as_pointer;
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T as_value;
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};
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public:
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//! Default constructor
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BOOST_DEFAULTED_FUNCTION(thread_specific(), {})
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//! Initializing constructor
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thread_specific(T const& value)
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{
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set(value);
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}
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//! Assignment
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thread_specific& operator= (T const& value)
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{
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set(value);
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return *this;
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}
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//! Accessor
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T get() const
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{
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value_storage cast = {};
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cast.as_pointer = thread_specific_base::get_content();
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return cast.as_value;
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}
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//! Setter
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void set(T const& value)
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{
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value_storage cast = {};
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cast.as_value = value;
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thread_specific_base::set_content(cast.as_pointer);
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}
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};
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} // namespace aux
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BOOST_LOG_CLOSE_NAMESPACE // namespace log
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} // namespace boost
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#include <boost/log/detail/footer.hpp>
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#endif // !defined(BOOST_LOG_NO_THREADS)
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#endif // BOOST_LOG_DETAIL_THREAD_SPECIFIC_HPP_INCLUDED_
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