//

// win_tss_ptr.hpp

// ~~~~~~~~~~~~~~~

//

// Copyright (c) 2003-2008 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_WIN_TSS_PTR_HPP

#define BOOST_ASIO_DETAIL_WIN_TSS_PTR_HPP



#if defined(_MSC_VER) && (_MSC_VER >= 1200)

# pragma once

#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)



#include <boost/asio/detail/push_options.hpp>



#include <boost/asio/detail/push_options.hpp>

#include <boost/config.hpp>

#include <boost/system/system_error.hpp>

#include <boost/asio/detail/pop_options.hpp>



#if defined(BOOST_WINDOWS)



#include <boost/asio/error.hpp>

#include <boost/asio/detail/noncopyable.hpp>

#include <boost/asio/detail/socket_types.hpp>



#include <boost/asio/detail/push_options.hpp>

#include <boost/throw_exception.hpp>

#include <boost/asio/detail/pop_options.hpp>



namespace boost {

namespace asio {

namespace detail {



template <typename T>

class win_tss_ptr

  : private noncopyable

{

public:

#if defined(UNDER_CE)

  enum { out_of_indexes = 0xFFFFFFFF };

#else

  enum { out_of_indexes = TLS_OUT_OF_INDEXES };

#endif



  // Constructor.

  win_tss_ptr()

  {

    tss_key_ = ::TlsAlloc();

    if (tss_key_ == out_of_indexes)

    {

      DWORD last_error = ::GetLastError();

      boost::system::system_error e(

          boost::system::error_code(last_error,

            boost::asio::error::get_system_category()),

          "tss");

      boost::throw_exception(e);

    }

  }



  // Destructor.

  ~win_tss_ptr()

  {

    ::TlsFree(tss_key_);

  }



  // Get the value.

  operator T*() const

  {

    return static_cast<T*>(::TlsGetValue(tss_key_));

  }



  // Set the value.

  void operator=(T* value)

  {

    ::TlsSetValue(tss_key_, value);

  }



private:

  // Thread-specific storage to allow unlocked access to determine whether a

  // thread is a member of the pool.

  DWORD tss_key_;

};



} // namespace detail

} // namespace asio

} // namespace boost



#endif // defined(BOOST_WINDOWS)



#include <boost/asio/detail/pop_options.hpp>



#endif // BOOST_ASIO_DETAIL_WIN_TSS_PTR_HPP

