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| MICROTIME(9) | FreeBSD Kernel Developer's Manual | MICROTIME(9) |
NAME
bintime, getbintime,
microtime, getmicrotime,
nanotime, getnanotime —
SYNOPSIS
#include <sys/time.h>
void
bintime(struct
bintime *bt);
void
getbintime(struct
bintime *bt);
void
microtime(struct
timeval *tv);
void
getmicrotime(struct
timeval *tv);
void
nanotime(struct
timespec *ts);
void
getnanotime(struct
timespec *tsp);
DESCRIPTION
Thebintime() and getbintime()
functions store the system time as a struct bintime at
the addresses specified by bt. The
microtime() and getmicrotime()
functions perform the same utility, but record the time as a
struct timeval instead. Similarly the
nanotime() and getnanotime()
functions store the time as a struct timespec.
The bintime(),
microtime(), and nanotime()
functions always query the timecounter to return the current time as
precisely as possible. Whereas getbintime(),
getmicrotime(), and
getnanotime() functions are abstractions which
return a less precise, but faster to obtain, time.
The intent of the getbintime(),
getmicrotime(), and
getnanotime() functions is to enforce the user's
preference for timer accuracy versus execution time.
SEE ALSO
binuptime(9), getbinuptime(9), getmicrouptime(9), getnanouptime(9), microuptime(9), nanouptime(9), tvtohz(9)HISTORY
Thebintime functions first appeared in
FreeBSD 5.0. The microtime and
nanotime functions first appeared in
FreeBSD 3.0 but have existed in other incarnations
since 4.4BSD.
AUTHORS
This manual page was written by Kelly Yancey <kbyanc@posi.net>.| September 16, 2004 | FreeBSD 13.1-RELEASE |
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