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diff --git a/3rdparty/asio/include/asio/impl/co_spawn.hpp b/3rdparty/asio/include/asio/impl/co_spawn.hpp
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+++ b/3rdparty/asio/include/asio/impl/co_spawn.hpp
@@ -0,0 +1,346 @@
+//
+// impl/co_spawn.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_IMPL_CO_SPAWN_HPP
+#define ASIO_IMPL_CO_SPAWN_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/associated_cancellation_slot.hpp"
+#include "asio/awaitable.hpp"
+#include "asio/dispatch.hpp"
+#include "asio/execution/outstanding_work.hpp"
+#include "asio/post.hpp"
+#include "asio/prefer.hpp"
+#include "asio/use_awaitable.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Executor, typename = void>
+class co_spawn_work_guard
+{
+public:
+ typedef typename decay<
+ typename prefer_result<Executor,
+ execution::outstanding_work_t::tracked_t
+ >::type
+ >::type executor_type;
+
+ co_spawn_work_guard(const Executor& ex)
+ : executor_(asio::prefer(ex, execution::outstanding_work.tracked))
+ {
+ }
+
+ executor_type get_executor() const ASIO_NOEXCEPT
+ {
+ return executor_;
+ }
+
+private:
+ executor_type executor_;
+};
+
+#if !defined(ASIO_NO_TS_EXECUTORS)
+
+template <typename Executor>
+struct co_spawn_work_guard<Executor,
+ typename enable_if<
+ !execution::is_executor<Executor>::value
+ >::type> : executor_work_guard<Executor>
+{
+ co_spawn_work_guard(const Executor& ex)
+ : executor_work_guard<Executor>(ex)
+ {
+ }
+};
+
+#endif // !defined(ASIO_NO_TS_EXECUTORS)
+
+template <typename Executor>
+inline co_spawn_work_guard<Executor>
+make_co_spawn_work_guard(const Executor& ex)
+{
+ return co_spawn_work_guard<Executor>(ex);
+}
+
+template <typename T, typename Executor, typename F, typename Handler>
+awaitable<awaitable_thread_entry_point, Executor> co_spawn_entry_point(
+ awaitable<T, Executor>*, Executor ex, F f, Handler handler)
+{
+ auto spawn_work = make_co_spawn_work_guard(ex);
+ auto handler_work = make_co_spawn_work_guard(
+ asio::get_associated_executor(handler, ex));
+
+ (void) co_await (dispatch)(
+ use_awaitable_t<Executor>{__FILE__, __LINE__, "co_spawn_entry_point"});
+
+ (co_await awaitable_thread_has_context_switched{}) = false;
+ std::exception_ptr e = nullptr;
+ bool done = false;
+ try
+ {
+ T t = co_await f();
+
+ done = true;
+
+ if (co_await awaitable_thread_has_context_switched{})
+ {
+ (dispatch)(handler_work.get_executor(),
+ [handler = std::move(handler), t = std::move(t)]() mutable
+ {
+ std::move(handler)(std::exception_ptr(), std::move(t));
+ });
+ }
+ else
+ {
+ (post)(handler_work.get_executor(),
+ [handler = std::move(handler), t = std::move(t)]() mutable
+ {
+ std::move(handler)(std::exception_ptr(), std::move(t));
+ });
+ }
+
+ co_return;
+ }
+ catch (...)
+ {
+ if (done)
+ throw;
+
+ e = std::current_exception();
+ }
+
+ if (co_await awaitable_thread_has_context_switched{})
+ {
+ (dispatch)(handler_work.get_executor(),
+ [handler = std::move(handler), e]() mutable
+ {
+ std::move(handler)(e, T());
+ });
+ }
+ else
+ {
+ (post)(handler_work.get_executor(),
+ [handler = std::move(handler), e]() mutable
+ {
+ std::move(handler)(e, T());
+ });
+ }
+}
+
+template <typename Executor, typename F, typename Handler>
+awaitable<awaitable_thread_entry_point, Executor> co_spawn_entry_point(
+ awaitable<void, Executor>*, Executor ex, F f, Handler handler)
+{
+ auto spawn_work = make_co_spawn_work_guard(ex);
+ auto handler_work = make_co_spawn_work_guard(
+ asio::get_associated_executor(handler, ex));
+
+ (void) co_await (dispatch)(
+ use_awaitable_t<Executor>{__FILE__, __LINE__, "co_spawn_entry_point"});
+
+ (co_await awaitable_thread_has_context_switched{}) = false;
+ std::exception_ptr e = nullptr;
+ try
+ {
+ co_await f();
+ }
+ catch (...)
+ {
+ e = std::current_exception();
+ }
+
+ if (co_await awaitable_thread_has_context_switched{})
+ {
+ (dispatch)(handler_work.get_executor(),
+ [handler = std::move(handler), e]() mutable
+ {
+ std::move(handler)(e);
+ });
+ }
+ else
+ {
+ (post)(handler_work.get_executor(),
+ [handler = std::move(handler), e]() mutable
+ {
+ std::move(handler)(e);
+ });
+ }
+}
+
+template <typename T, typename Executor>
+class awaitable_as_function
+{
+public:
+ explicit awaitable_as_function(awaitable<T, Executor>&& a)
+ : awaitable_(std::move(a))
+ {
+ }
+
+ awaitable<T, Executor> operator()()
+ {
+ return std::move(awaitable_);
+ }
+
+private:
+ awaitable<T, Executor> awaitable_;
+};
+
+template <typename Executor>
+class initiate_co_spawn
+{
+public:
+ typedef Executor executor_type;
+
+ template <typename OtherExecutor>
+ explicit initiate_co_spawn(const OtherExecutor& ex)
+ : ex_(ex)
+ {
+ }
+
+ executor_type get_executor() const ASIO_NOEXCEPT
+ {
+ return ex_;
+ }
+
+ template <typename Handler, typename F>
+ void operator()(Handler&& handler, F&& f) const
+ {
+ typedef typename result_of<F()>::type awaitable_type;
+
+ cancellation_state proxy_cancel_state(
+ asio::get_associated_cancellation_slot(handler),
+ enable_total_cancellation());
+
+ cancellation_state cancel_state(proxy_cancel_state.slot());
+
+ auto a = (co_spawn_entry_point)(static_cast<awaitable_type*>(nullptr),
+ ex_, std::forward<F>(f), std::forward<Handler>(handler));
+ awaitable_handler<executor_type, void>(std::move(a), ex_,
+ proxy_cancel_state.slot(), cancel_state).launch();
+ }
+
+private:
+ Executor ex_;
+};
+
+} // namespace detail
+
+template <typename Executor, typename T, typename AwaitableExecutor,
+ ASIO_COMPLETION_TOKEN_FOR(
+ void(std::exception_ptr, T)) CompletionToken>
+inline ASIO_INITFN_AUTO_RESULT_TYPE(
+ CompletionToken, void(std::exception_ptr, T))
+co_spawn(const Executor& ex,
+ awaitable<T, AwaitableExecutor> a, CompletionToken&& token,
+ typename constraint<
+ (is_executor<Executor>::value || execution::is_executor<Executor>::value)
+ && is_convertible<Executor, AwaitableExecutor>::value
+ >::type)
+{
+ return async_initiate<CompletionToken, void(std::exception_ptr, T)>(
+ detail::initiate_co_spawn<AwaitableExecutor>(AwaitableExecutor(ex)),
+ token, detail::awaitable_as_function<T, AwaitableExecutor>(std::move(a)));
+}
+
+template <typename Executor, typename AwaitableExecutor,
+ ASIO_COMPLETION_TOKEN_FOR(
+ void(std::exception_ptr)) CompletionToken>
+inline ASIO_INITFN_AUTO_RESULT_TYPE(
+ CompletionToken, void(std::exception_ptr))
+co_spawn(const Executor& ex,
+ awaitable<void, AwaitableExecutor> a, CompletionToken&& token,
+ typename constraint<
+ (is_executor<Executor>::value || execution::is_executor<Executor>::value)
+ && is_convertible<Executor, AwaitableExecutor>::value
+ >::type)
+{
+ return async_initiate<CompletionToken, void(std::exception_ptr)>(
+ detail::initiate_co_spawn<AwaitableExecutor>(AwaitableExecutor(ex)),
+ token, detail::awaitable_as_function<
+ void, AwaitableExecutor>(std::move(a)));
+}
+
+template <typename ExecutionContext, typename T, typename AwaitableExecutor,
+ ASIO_COMPLETION_TOKEN_FOR(
+ void(std::exception_ptr, T)) CompletionToken>
+inline ASIO_INITFN_AUTO_RESULT_TYPE(
+ CompletionToken, void(std::exception_ptr, T))
+co_spawn(ExecutionContext& ctx,
+ awaitable<T, AwaitableExecutor> a, CompletionToken&& token,
+ typename constraint<
+ is_convertible<ExecutionContext&, execution_context&>::value
+ && is_convertible<typename ExecutionContext::executor_type,
+ AwaitableExecutor>::value
+ >::type)
+{
+ return (co_spawn)(ctx.get_executor(), std::move(a),
+ std::forward<CompletionToken>(token));
+}
+
+template <typename ExecutionContext, typename AwaitableExecutor,
+ ASIO_COMPLETION_TOKEN_FOR(
+ void(std::exception_ptr)) CompletionToken>
+inline ASIO_INITFN_AUTO_RESULT_TYPE(
+ CompletionToken, void(std::exception_ptr))
+co_spawn(ExecutionContext& ctx,
+ awaitable<void, AwaitableExecutor> a, CompletionToken&& token,
+ typename constraint<
+ is_convertible<ExecutionContext&, execution_context&>::value
+ && is_convertible<typename ExecutionContext::executor_type,
+ AwaitableExecutor>::value
+ >::type)
+{
+ return (co_spawn)(ctx.get_executor(), std::move(a),
+ std::forward<CompletionToken>(token));
+}
+
+template <typename Executor, typename F,
+ ASIO_COMPLETION_TOKEN_FOR(typename detail::awaitable_signature<
+ typename result_of<F()>::type>::type) CompletionToken>
+inline ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken,
+ typename detail::awaitable_signature<typename result_of<F()>::type>::type)
+co_spawn(const Executor& ex, F&& f, CompletionToken&& token,
+ typename constraint<
+ is_executor<Executor>::value || execution::is_executor<Executor>::value
+ >::type)
+{
+ return async_initiate<CompletionToken,
+ typename detail::awaitable_signature<typename result_of<F()>::type>::type>(
+ detail::initiate_co_spawn<
+ typename result_of<F()>::type::executor_type>(ex),
+ token, std::forward<F>(f));
+}
+
+template <typename ExecutionContext, typename F,
+ ASIO_COMPLETION_TOKEN_FOR(typename detail::awaitable_signature<
+ typename result_of<F()>::type>::type) CompletionToken>
+inline ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken,
+ typename detail::awaitable_signature<typename result_of<F()>::type>::type)
+co_spawn(ExecutionContext& ctx, F&& f, CompletionToken&& token,
+ typename constraint<
+ is_convertible<ExecutionContext&, execution_context&>::value
+ >::type)
+{
+ return (co_spawn)(ctx.get_executor(), std::forward<F>(f),
+ std::forward<CompletionToken>(token));
+}
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IMPL_CO_SPAWN_HPP