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Run the io_context object's event processing
loop until a specified time.
template< typename Clock, typename Duration> std::size_t run_until( const chrono::time_point< Clock, Duration > & abs_time);
The run_until()
function blocks until all work has finished and there are no more handlers
to be dispatched, until the io_context has been stopped, or
until the specified time has been reached.
The time point until which the call may block.
The number of handlers that were executed.