ceph/src/boost/boost/asio/detail/win_global.hpp

   1 //
   2 // detail/win_global.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #ifndef BOOST_ASIO_DETAIL_WIN_GLOBAL_HPP
  12 #define BOOST_ASIO_DETAIL_WIN_GLOBAL_HPP
  13
  14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  15 # pragma once
  16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  17
  18 #include <boost/asio/detail/config.hpp>
  19 #include <boost/asio/detail/static_mutex.hpp>
  20 #include <boost/asio/detail/tss_ptr.hpp>
  21
  22 #include <boost/asio/detail/push_options.hpp>
  23
  24 namespace boost {
  25 namespace asio {
  26 namespace detail {
  27
  28 template <typename T>
  29 struct win_global_impl
  30 {
  31   // Destructor automatically cleans up the global.
  32   ~win_global_impl()
  33   {
  34     delete ptr_;
  35   }
  36
  37   static win_global_impl instance_;
  38   static static_mutex mutex_;
  39   static T* ptr_;
  40   static tss_ptr<T> tss_ptr_;
  41 };
  42
  43 template <typename T>
  44 win_global_impl<T> win_global_impl<T>::instance_ = { 0 };
  45
  46 template <typename T>
  47 static_mutex win_global_impl<T>::mutex_ = BOOST_ASIO_STATIC_MUTEX_INIT;
  48
  49 template <typename T>
  50 T* win_global_impl<T>::ptr_ = 0;
  51
  52 template <typename T>
  53 tss_ptr<T> win_global_impl<T>::tss_ptr_;
  54
  55 template <typename T>
  56 T& win_global()
  57 {
  58   if (static_cast<T*>(win_global_impl<T>::tss_ptr_) == 0)
  59   {
  60     win_global_impl<T>::mutex_.init();
  61     static_mutex::scoped_lock lock(win_global_impl<T>::mutex_);
  62     win_global_impl<T>::ptr_ = new T;
  63     win_global_impl<T>::tss_ptr_ = win_global_impl<T>::ptr_;
  64   }
  65
  66   return *win_global_impl<T>::tss_ptr_;
  67 }
  68
  69 } // namespace detail
  70 } // namespace asio
  71 } // namespace boost
  72
  73 #include <boost/asio/detail/pop_options.hpp>
  74
  75 #endif // BOOST_ASIO_DETAIL_WIN_GLOBAL_HPP