// // detail/win_global.hpp // ~~~~~~~~~~~~~~~~~~~~~ // // Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com) // // 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) // #ifndef ASIO_DETAIL_WIN_GLOBAL_HPP #define ASIO_DETAIL_WIN_GLOBAL_HPP #if defined(_MSC_VER) && (_MSC_VER >= 1200) # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) #include "asio/detail/config.hpp" #include "asio/detail/static_mutex.hpp" #include "asio/detail/tss_ptr.hpp" #include "asio/detail/push_options.hpp" namespace asio { namespace detail { template <typename T> struct win_global_impl { // Destructor automatically cleans up the global. ~win_global_impl() { delete ptr_; } static win_global_impl instance_; static static_mutex mutex_; static T* ptr_; static tss_ptr<T> tss_ptr_; }; template <typename T> win_global_impl<T> win_global_impl<T>::instance_ = { 0 }; template <typename T> static_mutex win_global_impl<T>::mutex_ = ASIO_STATIC_MUTEX_INIT; template <typename T> T* win_global_impl<T>::ptr_ = 0; template <typename T> tss_ptr<T> win_global_impl<T>::tss_ptr_; template <typename T> T& win_global() { if (static_cast<T*>(win_global_impl<T>::tss_ptr_) == 0) { win_global_impl<T>::mutex_.init(); static_mutex::scoped_lock lock(win_global_impl<T>::mutex_); win_global_impl<T>::ptr_ = new T; win_global_impl<T>::tss_ptr_ = win_global_impl<T>::ptr_; } return *win_global_impl<T>::tss_ptr_; } } // namespace detail } // namespace asio #include "asio/detail/pop_options.hpp" #endif // ASIO_DETAIL_WIN_GLOBAL_HPP