| MICROUPTIME(9) | Kernel Developer's Manual | MICROUPTIME(9) |
binuptime,
getbinuptime, microuptime,
getmicrouptime, nanouptime,
getnanouptime, sbinuptime,
getsbinuptime — get the time
elapsed since boot
#include
<sys/time.h>
void
binuptime(struct
bintime *bt);
void
getbinuptime(struct
bintime *bt);
void
microuptime(struct
timeval *tv);
void
getmicrouptime(struct
timeval *tv);
void
nanouptime(struct
timespec *ts);
void
getnanouptime(struct
timespec *tsp);
sbintime_t
sbinuptime(void);
sbintime_t
getsbinuptime(void);
The
binuptime()
and getbinuptime() functions store the time elapsed
since boot as a struct bintime at the address
specified by bt. The
microuptime() and
getmicrouptime() functions perform the same utility,
but record the elapsed time as a struct timeval
instead. Similarly the nanouptime() and
getnanouptime() functions store the elapsed time as
a struct timespec. The
sbinuptime() and
getsbinuptime() functions return the time elapsed
since boot as a sbintime_t.
The
binuptime(),
microuptime(),
nanouptime(),
and
sbinuptime()
functions always query the timecounter to return the current time as
precisely as possible. Whereas getbinuptime(),
getmicrouptime(),
getnanouptime(), and
getsbinuptime() functions are abstractions which
return a less precise, but faster to obtain, time.
The intent of the
getbinuptime(),
getmicrouptime(),
getnanouptime(),
and
getsbinuptime()
functions is to enforce the user's preference for timer accuracy versus
execution time.
bintime(9), get_cyclecount(9), getbintime(9), getmicrotime(9), getnanotime(9), microtime(9), nanotime(9), tvtohz(9)
This manual page was written by Kelly Yancey <kbyanc@posi.net>.
| February 21, 2015 | Debian |