//
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// detail/win_global.hpp
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// ~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_ASIO_DETAIL_WIN_GLOBAL_HPP
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#define BOOST_ASIO_DETAIL_WIN_GLOBAL_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include <boost/asio/detail/config.hpp>
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#include <boost/asio/detail/static_mutex.hpp>
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#include <boost/asio/detail/tss_ptr.hpp>
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#include <boost/asio/detail/push_options.hpp>
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namespace boost {
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namespace asio {
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namespace detail {
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template <typename T>
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struct win_global_impl
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{
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// Destructor automatically cleans up the global.
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~win_global_impl()
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{
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delete ptr_;
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}
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static win_global_impl instance_;
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static static_mutex mutex_;
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T* ptr_;
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static tss_ptr<T> tss_ptr_;
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};
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template <typename T>
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win_global_impl<T> win_global_impl<T>::instance_ = { 0 };
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template <typename T>
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static_mutex win_global_impl<T>::mutex_ = BOOST_ASIO_STATIC_MUTEX_INIT;
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template <typename T>
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tss_ptr<T> win_global_impl<T>::tss_ptr_;
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template <typename T>
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T& win_global()
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{
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if (static_cast<T*>(win_global_impl<T>::tss_ptr_) == 0)
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{
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win_global_impl<T>::mutex_.init();
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static_mutex::scoped_lock lock(win_global_impl<T>::mutex_);
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if (win_global_impl<T>::instance_.ptr_ == 0)
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win_global_impl<T>::instance_.ptr_ = new T;
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win_global_impl<T>::tss_ptr_ = win_global_impl<T>::instance_.ptr_;
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}
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return *win_global_impl<T>::tss_ptr_;
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}
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} // namespace detail
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} // namespace asio
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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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#endif // BOOST_ASIO_DETAIL_WIN_GLOBAL_HPP
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