Re: [osg-users] Getting System time, milliseconds

[Paul Melis]

J.P. Delport wrote:
For Linux, play with this:
#ifndef WIN32

/// High resolution timers for Linux.


    #define NSEC_PER_SEC 1000000000LL

    inline uint64_t timespec_to_ns(const struct timespec *ts)
    {
        return ((uint64_t) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
    }

    /// Returns nanoseconds since epoch.
    inline uint64_t currentTimeNanoSec()
    {
        struct timespec timestamp_ts;
        //clock_gettime(CLOCK_MONOTONIC, &timestamp_ts);
        clock_gettime(CLOCK_REALTIME, &timestamp_ts);
        return timespec_to_ns(&timestamp_ts);
    }

    inline uint64_t clockResNanoSec()
    {
        struct timespec timestamp_ts;
        //clock_getres(CLOCK_MONOTONIC, &timestamp_ts);
        clock_getres(CLOCK_REALTIME, &timestamp_ts);
        return timespec_to_ns(&timestamp_ts);
    }

    #if 0
    int main(void)
    {
        printf("%lld, %lld\n", currentTimeNanoSec(), clockResNanoSec());
        printf("%lld, %lld\n", currentTimeNanoSec(), clockResNanoSec());
    }
    #endif
#else
Interesting, I had compared different ways of doing timing on Linux some 
time ago and was certain that clock_gettime() didn't work for me.
But now I tested it again it at least seems to provide enough precision. 
Ah well, I'll probably never figure out what happened :)

Thanks,
Paul

_______________________________________________
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org