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diff --git a/3rdparty/asio/include/asio/detail/posix_thread.hpp b/3rdparty/asio/include/asio/detail/posix_thread.hpp
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+//
+// detail/posix_thread.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_POSIX_THREAD_HPP
+#define ASIO_DETAIL_POSIX_THREAD_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_PTHREADS)
+
+#include <cstddef>
+#include <pthread.h>
+#include "asio/detail/noncopyable.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+extern "C"
+{
+ ASIO_DECL void* asio_detail_posix_thread_function(void* arg);
+}
+
+class posix_thread
+ : private noncopyable
+{
+public:
+ // Constructor.
+ template <typename Function>
+ posix_thread(Function f, unsigned int = 0)
+ : joined_(false)
+ {
+ start_thread(new func<Function>(f));
+ }
+
+ // Destructor.
+ ASIO_DECL ~posix_thread();
+
+ // Wait for the thread to exit.
+ ASIO_DECL void join();
+
+ // Get number of CPUs.
+ ASIO_DECL static std::size_t hardware_concurrency();
+
+private:
+ friend void* asio_detail_posix_thread_function(void* arg);
+
+ class func_base
+ {
+ public:
+ virtual ~func_base() {}
+ virtual void run() = 0;
+ };
+
+ struct auto_func_base_ptr
+ {
+ func_base* ptr;
+ ~auto_func_base_ptr() { delete ptr; }
+ };
+
+ template <typename Function>
+ class func
+ : public func_base
+ {
+ public:
+ func(Function f)
+ : f_(f)
+ {
+ }
+
+ virtual void run()
+ {
+ f_();
+ }
+
+ private:
+ Function f_;
+ };
+
+ ASIO_DECL void start_thread(func_base* arg);
+
+ ::pthread_t thread_;
+ bool joined_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/detail/impl/posix_thread.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // defined(ASIO_HAS_PTHREADS)
+
+#endif // ASIO_DETAIL_POSIX_THREAD_HPP