| // |
| // detail/winsock_init.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2010 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 BOOST_ASIO_DETAIL_WINSOCK_INIT_HPP |
| #define BOOST_ASIO_DETAIL_WINSOCK_INIT_HPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
| |
| #include <boost/asio/detail/config.hpp> |
| |
| #if defined(BOOST_WINDOWS) || defined(__CYGWIN__) |
| |
| #include <boost/asio/detail/push_options.hpp> |
| |
| namespace boost { |
| namespace asio { |
| namespace detail { |
| |
| class winsock_init_base |
| { |
| protected: |
| // Structure to track result of initialisation and number of uses. POD is used |
| // to ensure that the values are zero-initialised prior to any code being run. |
| struct data |
| { |
| long init_count_; |
| long result_; |
| }; |
| |
| BOOST_ASIO_DECL static void startup(data& d, |
| unsigned char major, unsigned char minor); |
| |
| BOOST_ASIO_DECL static void cleanup(data& d); |
| |
| BOOST_ASIO_DECL static void throw_on_error(data& d); |
| }; |
| |
| template <int Major = 2, int Minor = 0> |
| class winsock_init : private winsock_init_base |
| { |
| public: |
| winsock_init(bool allow_throw = true) |
| { |
| startup(data_, Major, Minor); |
| if (allow_throw) |
| throw_on_error(data_); |
| } |
| |
| winsock_init(const winsock_init&) |
| { |
| startup(data_, Major, Minor); |
| throw_on_error(data_); |
| } |
| |
| ~winsock_init() |
| { |
| cleanup(data_); |
| } |
| |
| private: |
| static data data_; |
| }; |
| |
| template <int Major, int Minor> |
| winsock_init_base::data winsock_init<Major, Minor>::data_; |
| |
| // Static variable to ensure that winsock is initialised before main, and |
| // therefore before any other threads can get started. |
| static const winsock_init<>& winsock_init_instance = winsock_init<>(false); |
| |
| } // namespace detail |
| } // namespace asio |
| } // namespace boost |
| |
| #include <boost/asio/detail/pop_options.hpp> |
| |
| #if defined(BOOST_ASIO_HEADER_ONLY) |
| # include <boost/asio/detail/impl/winsock_init.ipp> |
| #endif // defined(BOOST_ASIO_HEADER_ONLY) |
| |
| #endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__) |
| |
| #endif // BOOST_ASIO_DETAIL_WINSOCK_INIT_HPP |