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| MICROUPTIME(9) | FreeBSD Kernel Developer's Manual | MICROUPTIME(9) |
NAME
binuptime, getbinuptime,
microuptime, getmicrouptime,
nanouptime, getnanouptime,
sbinuptime, getsbinuptime
—
SYNOPSIS
#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);
DESCRIPTION
Thebinuptime() 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.
SEE ALSO
bintime(9), get_cyclecount(9), getbintime(9), getmicrotime(9), getnanotime(9), microtime(9), nanotime(9), tvtohz(9)AUTHORS
This manual page was written by Kelly Yancey <kbyanc@posi.net>.| February 21, 2015 | FreeBSD 13.1-RELEASE |
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