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diff --git a/lib/asio/system_executor.hpp b/lib/asio/system_executor.hpp
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+//
+// system_executor.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 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_SYSTEM_EXECUTOR_HPP
+#define ASIO_SYSTEM_EXECUTOR_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/push_options.hpp"
+
+namespace asio {
+
+class system_context;
+
+/// An executor that uses arbitrary threads.
+/**
+ * The system executor represents an execution context where functions are
+ * permitted to run on arbitrary threads. The post() and defer() functions
+ * schedule the function to run on an unspecified system thread pool, and
+ * dispatch() invokes the function immediately.
+ */
+class system_executor
+{
+public:
+  /// Obtain the underlying execution context.
+  system_context& context() const ASIO_NOEXCEPT;
+
+  /// Inform the executor that it has some outstanding work to do.
+  /**
+   * For the system executor, this is a no-op.
+   */
+  void on_work_started() const ASIO_NOEXCEPT
+  {
+  }
+
+  /// Inform the executor that some work is no longer outstanding.
+  /**
+   * For the system executor, this is a no-op.
+   */
+  void on_work_finished() const ASIO_NOEXCEPT
+  {
+  }
+
+  /// Request the system executor to invoke the given function object.
+  /**
+   * This function is used to ask the executor to execute the given function
+   * object. The function object will always be executed inside this function.
+   *
+   * @param f The function object to be called. The executor will make
+   * a copy of the handler object as required. The function signature of the
+   * function object must be: @code void function(); @endcode
+   *
+   * @param a An allocator that may be used by the executor to allocate the
+   * internal storage needed for function invocation.
+   */
+  template <typename Function, typename Allocator>
+  void dispatch(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
+
+  /// Request the system executor to invoke the given function object.
+  /**
+   * This function is used to ask the executor to execute the given function
+   * object. The function object will never be executed inside this function.
+   * Instead, it will be scheduled to run on an unspecified system thread pool.
+   *
+   * @param f The function object to be called. The executor will make
+   * a copy of the handler object as required. The function signature of the
+   * function object must be: @code void function(); @endcode
+   *
+   * @param a An allocator that may be used by the executor to allocate the
+   * internal storage needed for function invocation.
+   */
+  template <typename Function, typename Allocator>
+  void post(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
+
+  /// Request the system executor to invoke the given function object.
+  /**
+   * This function is used to ask the executor to execute the given function
+   * object. The function object will never be executed inside this function.
+   * Instead, it will be scheduled to run on an unspecified system thread pool.
+   *
+   * @param f The function object to be called. The executor will make
+   * a copy of the handler object as required. The function signature of the
+   * function object must be: @code void function(); @endcode
+   *
+   * @param a An allocator that may be used by the executor to allocate the
+   * internal storage needed for function invocation.
+   */
+  template <typename Function, typename Allocator>
+  void defer(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
+
+  /// Compare two executors for equality.
+  /**
+   * System executors always compare equal.
+   */
+  friend bool operator==(const system_executor&,
+      const system_executor&) ASIO_NOEXCEPT
+  {
+    return true;
+  }
+
+  /// Compare two executors for inequality.
+  /**
+   * System executors always compare equal.
+   */
+  friend bool operator!=(const system_executor&,
+      const system_executor&) ASIO_NOEXCEPT
+  {
+    return false;
+  }
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/impl/system_executor.hpp"
+
+#endif // ASIO_SYSTEM_EXECUTOR_HPP