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92 lines
2.2 KiB
92 lines
2.2 KiB
// |
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// detail/winsock_init.hpp |
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// ~~~~~~~~~~~~~~~~~~~~~~~ |
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// |
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// Copyright (c) 2003-2011 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_WINSOCK_INIT_HPP |
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#define BOOST_ASIO_DETAIL_WINSOCK_INIT_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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#if defined(BOOST_WINDOWS) || defined(__CYGWIN__) |
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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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class winsock_init_base |
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{ |
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protected: |
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// Structure to track result of initialisation and number of uses. POD is used |
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// to ensure that the values are zero-initialised prior to any code being run. |
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struct data |
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{ |
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long init_count_; |
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long result_; |
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}; |
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BOOST_ASIO_DECL static void startup(data& d, |
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unsigned char major, unsigned char minor); |
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BOOST_ASIO_DECL static void cleanup(data& d); |
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BOOST_ASIO_DECL static void throw_on_error(data& d); |
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}; |
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template <int Major = 2, int Minor = 0> |
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class winsock_init : private winsock_init_base |
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{ |
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public: |
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winsock_init(bool allow_throw = true) |
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{ |
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startup(data_, Major, Minor); |
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if (allow_throw) |
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throw_on_error(data_); |
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} |
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winsock_init(const winsock_init&) |
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{ |
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startup(data_, Major, Minor); |
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throw_on_error(data_); |
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} |
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~winsock_init() |
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{ |
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cleanup(data_); |
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} |
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private: |
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static data data_; |
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}; |
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template <int Major, int Minor> |
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winsock_init_base::data winsock_init<Major, Minor>::data_; |
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// Static variable to ensure that winsock is initialised before main, and |
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// therefore before any other threads can get started. |
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static const winsock_init<>& winsock_init_instance = winsock_init<>(false); |
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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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#if defined(BOOST_ASIO_HEADER_ONLY) |
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# include <boost/asio/detail/impl/winsock_init.ipp> |
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#endif // defined(BOOST_ASIO_HEADER_ONLY) |
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#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__) |
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#endif // BOOST_ASIO_DETAIL_WINSOCK_INIT_HPP
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