Hello Patrick, I guess gettimeofday is too heavy if all you need is an abstract timestamp not related to any particular calendar. I think you should look at rte_rdtsc()? It returns a current value of CPU tick counter. So it's very cheap (just a few clocks) and has a great resolution (a fraction of nanosecond).
Regards, Dmitry > I have a need to keep a timestamp on a piece of global data. When then > timestamp grows too old I want to refresh that data. Is it safe to use, > gettimeofday()? > > I thought about using an alarm, but I need to set an alarm from inside the > alarm callback which doesn't look like it will work due to the spinlock on > the alarm list. > > And since this is inside the driver I am working on, setting up a timer is > not simple. > > So, I figure to timestamp the data, wait until I need to access it, check the > timestamp and refresh if it is too old. > > Thoughts? Suggestions? > > Thanks, > > Patrick > > Coming to you from deep inside Fortress Mahan
