//
// detail/impl/win_mutex.ipp
// ~~~~~~~~~~~~~~~~~~~~~~~~~
//
// 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_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_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_);
# else
  if (!::InitializeCriticalSectionAndSpinCount(&crit_section_, 0x80000000))
    return ::GetLastError();
# endif
  return 0;
#else
  __try
  {
# if defined(UNDER_CE)
    ::InitializeCriticalSection(&crit_section_);
# 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_WINDOWS)

#endif // BOOST_ASIO_DETAIL_IMPL_WIN_MUTEX_IPP