microtime_pcpu
union microtime_pcpu start, end;
union microtime_pcpu prev_t;
union microtime_pcpu poll_start_t; /* state */
union microtime_pcpu t;
union microtime_pcpu t;
microtime_pcpu_get(union microtime_pcpu *t)
microtime_pcpu_diff(const union microtime_pcpu *s,
const union microtime_pcpu *e)