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diff --git a/3rdparty/asio/include/asio/detail/blocking_executor_op.hpp b/3rdparty/asio/include/asio/detail/blocking_executor_op.hpp
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+//
+// detail/blocking_executor_op.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_BLOCKING_EXECUTOR_OP_HPP
+#define ASIO_DETAIL_BLOCKING_EXECUTOR_OP_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/event.hpp"
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/scheduler_operation.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Operation = scheduler_operation>
+class blocking_executor_op_base : public Operation
+{
+public:
+ blocking_executor_op_base(typename Operation::func_type complete_func)
+ : Operation(complete_func),
+ is_complete_(false)
+ {
+ }
+
+ void wait()
+ {
+ asio::detail::mutex::scoped_lock lock(mutex_);
+ while (!is_complete_)
+ event_.wait(lock);
+ }
+
+protected:
+ struct do_complete_cleanup
+ {
+ ~do_complete_cleanup()
+ {
+ asio::detail::mutex::scoped_lock lock(op_->mutex_);
+ op_->is_complete_ = true;
+ op_->event_.unlock_and_signal_one_for_destruction(lock);
+ }
+
+ blocking_executor_op_base* op_;
+ };
+
+private:
+ asio::detail::mutex mutex_;
+ asio::detail::event event_;
+ bool is_complete_;
+};
+
+template <typename Handler, typename Operation = scheduler_operation>
+class blocking_executor_op : public blocking_executor_op_base<Operation>
+{
+public:
+ blocking_executor_op(Handler& h)
+ : blocking_executor_op_base<Operation>(&blocking_executor_op::do_complete),
+ handler_(h)
+ {
+ }
+
+ static void do_complete(void* owner, Operation* base,
+ const asio::error_code& /*ec*/,
+ std::size_t /*bytes_transferred*/)
+ {
+ blocking_executor_op* o(static_cast<blocking_executor_op*>(base));
+
+ typename blocking_executor_op_base<Operation>::do_complete_cleanup
+ on_exit = { o };
+ (void)on_exit;
+
+ ASIO_HANDLER_COMPLETION((*o));
+
+ // Make the upcall if required.
+ if (owner)
+ {
+ fenced_block b(fenced_block::half);
+ ASIO_HANDLER_INVOCATION_BEGIN(());
+ asio_handler_invoke_helpers::invoke(o->handler_, o->handler_);
+ ASIO_HANDLER_INVOCATION_END;
+ }
+ }
+
+private:
+ Handler& handler_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_BLOCKING_EXECUTOR_OP_HPP