time_t _start_time;
std::string _sub_name;
- /** mutex for _progress */
+ /** mutex for _progress and _last_progress_update */
mutable boost::mutex _progress_mutex;
boost::optional<float> _progress;
+ boost::optional<struct timeval> _last_progress_update;
/** condition to signal changes to pause/resume so that we know when to wake;
this could be a general _state_change if it made more sense.