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diff --git a/3rdparty/asio/include/asio/detail/null_signal_blocker.hpp b/3rdparty/asio/include/asio/detail/null_signal_blocker.hpp
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+//
+// detail/null_signal_blocker.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_NULL_SIGNAL_BLOCKER_HPP
+#define ASIO_DETAIL_NULL_SIGNAL_BLOCKER_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_HAS_THREADS) \
+ || defined(ASIO_WINDOWS) \
+ || defined(ASIO_WINDOWS_RUNTIME) \
+ || defined(__CYGWIN__) \
+ || defined(__SYMBIAN32__)
+
+#include "asio/detail/noncopyable.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class null_signal_blocker
+ : private noncopyable
+{
+public:
+ // Constructor blocks all signals for the calling thread.
+ null_signal_blocker()
+ {
+ }
+
+ // Destructor restores the previous signal mask.
+ ~null_signal_blocker()
+ {
+ }
+
+ // Block all signals for the calling thread.
+ void block()
+ {
+ }
+
+ // Restore the previous signal mask.
+ void unblock()
+ {
+ }
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // !defined(ASIO_HAS_THREADS)
+ // || defined(ASIO_WINDOWS)
+ // || defined(ASIO_WINDOWS_RUNTIME)
+ // || defined(__CYGWIN__)
+ // || defined(__SYMBIAN32__)
+
+#endif // ASIO_DETAIL_NULL_SIGNAL_BLOCKER_HPP