text: //
  // detail/impl/win_mutex.ipp
  // ~~~~~~~~~~~~~~~~~~~~~~~~~
  //
  // Copyright (c) 2003-2015 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_IMPL_WIN_MUTEX_IPP
  #define BOOST_ASIO_DETAIL_IMPL_WIN_MUTEX_IPP
  
  #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_ASIO_WINDOWS)
  
  #include <boost/asio/detail/throw_error.hpp>
  #include <boost/asio/detail/win_mutex.hpp>
  #include <boost/asio/error.hpp>
  
  #include <boost/asio/detail/push_options.hpp>
  
  namespace boost {
  namespace asio {
  namespace detail {
  
  win_mutex::win_mutex()
  {
    int error = do_init();
    boost::system::error_code ec(error,
        boost::asio::error::get_system_category());
    boost::asio::detail::throw_error(ec, "mutex");
  }
  
  int win_mutex::do_init()
  {
  #if defined(__MINGW32__)
    // Not sure if MinGW supports structured exception handling, so for now
    // we'll just call the Windows API and hope.
  # if defined(UNDER_CE)
    ::InitializeCriticalSection(&crit_section_);
  # elif defined(BOOST_ASIO_WINDOWS_APP)
    ::InitializeCriticalSectionEx(&crit_section_, 0x80000000, 0);
  # else
    if (!::InitializeCriticalSectionAndSpinCount(&crit_section_, 0x80000000))
      return ::GetLastError();
  # endif
    return 0;
  #else
    __try
    {
  # if defined(UNDER_CE)
      ::InitializeCriticalSection(&crit_section_);
  # elif defined(BOOST_ASIO_WINDOWS_APP)
      if (!::InitializeCriticalSectionEx(&crit_section_, 0, 0))
  	  return ::GetLastError();
  # else
      if (!::InitializeCriticalSectionAndSpinCount(&crit_section_, 0x80000000))
        return ::GetLastError();
  # endif
    }
    __except(GetExceptionCode() == STATUS_NO_MEMORY
        ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
    {
      return ERROR_OUTOFMEMORY;
    }
  
    return 0;
  #endif
  }
  
  } // namespace detail
  } // namespace asio
  } // namespace boost
  
  #include <boost/asio/detail/pop_options.hpp>
  
  #endif // defined(BOOST_ASIO_WINDOWS)
  
  #endif // BOOST_ASIO_DETAIL_IMPL_WIN_MUTEX_IPP
  