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diff --git a/boost/asio/detail/win_tss_ptr.hpp b/boost/asio/detail/win_tss_ptr.hpp
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+++ b/boost/asio/detail/win_tss_ptr.hpp
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+//
+// detail/win_tss_ptr.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2012 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/config.hpp>
+
+#if defined(BOOST_WINDOWS)
+
+#include <boost/asio/detail/noncopyable.hpp>
+#include <boost/asio/detail/socket_types.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+// Helper function to create thread-specific storage.
+BOOST_ASIO_DECL DWORD win_tss_ptr_create();
+
+template <typename T>
+class win_tss_ptr
+  : private noncopyable
+{
+public:
+  // Constructor.
+  win_tss_ptr()
+    : tss_key_(win_tss_ptr_create())
+  {
+  }
+
+  // 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
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#if defined(BOOST_ASIO_HEADER_ONLY)
+# include <boost/asio/detail/impl/win_tss_ptr.ipp>
+#endif // defined(BOOST_ASIO_HEADER_ONLY)
+
+#endif // defined(BOOST_WINDOWS)
+
+#endif // BOOST_ASIO_DETAIL_WIN_TSS_PTR_HPP