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diff --git a/3rdparty/asio/include/asio/detail/win_tss_ptr.hpp b/3rdparty/asio/include/asio/detail/win_tss_ptr.hpp
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+//
+// detail/win_tss_ptr.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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 ASIO_DETAIL_WIN_TSS_PTR_HPP
+#define ASIO_DETAIL_WIN_TSS_PTR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if defined(ASIO_WINDOWS)
+
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/socket_types.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+// Helper function to create thread-specific storage.
+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
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/detail/impl/win_tss_ptr.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // defined(ASIO_WINDOWS)
+
+#endif // ASIO_DETAIL_WIN_TSS_PTR_HPP