// | |
// detail/winsock_init.hpp | |
// ~~~~~~~~~~~~~~~~~~~~~~~ | |
// | |
// Copyright (c) 2003-2011 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 |