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//
// 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
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