|  | 
           
Run the io_context
          object's event processing loop for a specified duration to execute at most
          one handler.
        
template< typename Rep, typename Period> std::size_t run_one_for( const chrono::duration< Rep, Period > & rel_time);
          The run_one_for()
          function blocks until one handler has been dispatched, until the io_context
          has been stopped, or until the specified duration has elapsed.
        
The duration for which the call may block.
The number of handlers that were executed.