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diff --git a/3rdparty/asio/include/asio/detail/null_event.hpp b/3rdparty/asio/include/asio/detail/null_event.hpp
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+//
+// detail/null_event.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_EVENT_HPP
+#define ASIO_DETAIL_NULL_EVENT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/detail/noncopyable.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class null_event
+ : private noncopyable
+{
+public:
+ // Constructor.
+ null_event()
+ {
+ }
+
+ // Destructor.
+ ~null_event()
+ {
+ }
+
+ // Signal the event. (Retained for backward compatibility.)
+ template <typename Lock>
+ void signal(Lock&)
+ {
+ }
+
+ // Signal all waiters.
+ template <typename Lock>
+ void signal_all(Lock&)
+ {
+ }
+
+ // Unlock the mutex and signal one waiter.
+ template <typename Lock>
+ void unlock_and_signal_one(Lock&)
+ {
+ }
+
+ // Unlock the mutex and signal one waiter who may destroy us.
+ template <typename Lock>
+ void unlock_and_signal_one_for_destruction(Lock&)
+ {
+ }
+
+ // If there's a waiter, unlock the mutex and signal it.
+ template <typename Lock>
+ bool maybe_unlock_and_signal_one(Lock&)
+ {
+ return false;
+ }
+
+ // Reset the event.
+ template <typename Lock>
+ void clear(Lock&)
+ {
+ }
+
+ // Wait for the event to become signalled.
+ template <typename Lock>
+ void wait(Lock&)
+ {
+ do_wait();
+ }
+
+ // Timed wait for the event to become signalled.
+ template <typename Lock>
+ bool wait_for_usec(Lock&, long usec)
+ {
+ do_wait_for_usec(usec);
+ return true;
+ }
+
+private:
+ ASIO_DECL static void do_wait();
+ ASIO_DECL static void do_wait_for_usec(long usec);
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/detail/impl/null_event.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_DETAIL_NULL_EVENT_HPP