gettime_ns
tstop = (gettime_ns(cfg_clockid) - glob_tstart) / 1000;
} while (gettime_ns(cfg_clockid) < tdeliver_max);
now = gettime_ns(CLOCK_REALTIME);
glob_tstart = gettime_ns(cfg_clockid);
glob_tstart = gettime_ns(cfg_clockid);