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//
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// detail/win_tss_ptr.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2015 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_WIN_TSS_PTR_HPP
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#define BOOST_ASIO_DETAIL_WIN_TSS_PTR_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_ASIO_WINDOWS)
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#include <boost/asio/detail/noncopyable.hpp>
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#include <boost/asio/detail/socket_types.hpp>
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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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// Helper function to create thread-specific storage.
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BOOST_ASIO_DECL DWORD win_tss_ptr_create();
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template <typename T>
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class win_tss_ptr
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  : private noncopyable
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{
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public:
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  // Constructor.
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  win_tss_ptr()
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    : tss_key_(win_tss_ptr_create())
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  {
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  }
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  // Destructor.
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  ~win_tss_ptr()
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  {
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    ::TlsFree(tss_key_);
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  }
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  // Get the value.
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  operator T*() const
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  {
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    return static_cast<T*>(::TlsGetValue(tss_key_));
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  }
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  // Set the value.
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  void operator=(T* value)
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  {
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    ::TlsSetValue(tss_key_, value);
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  }
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private:
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  // Thread-specific storage to allow unlocked access to determine whether a
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  // thread is a member of the pool.
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  DWORD tss_key_;
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};
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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/win_tss_ptr.ipp>
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#endif // defined(BOOST_ASIO_HEADER_ONLY)
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#endif // defined(BOOST_ASIO_WINDOWS)
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#endif // BOOST_ASIO_DETAIL_WIN_TSS_PTR_HPP