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NetBSD 6.1.5 - man page for getbintime (netbsd section 9)

MICROTIME(9)			  BSD Kernel Developer's Manual 		     MICROTIME(9)

NAME
     bintime, getbintime, microtime, getmicrotime, nanotime, getnanotime -- get the current time

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
     The bintime() 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 structures are described
     in timeval(3).

     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.  They should be used where a
     precision of 1/HZ (e.g., 10 msec on a 100HZ machine, see hz(9)) is acceptable or where per-
     formance is priority.

     The system realtime clock is guaranteed to be monotonically increasing at all times.  As
     such, all calls to these functions are guaranteed to return a system time greater than or
     equal to the system time returned in any previous calls.  Comparable functions exist to
     retrieve the time elapsed since boot; see microuptime(9).

SEE ALSO
     settimeofday(2), bintime_add(9), inittodr(9), time_second(9), tvtohz(9)

CODE REFERENCES
     The implementation of the microtime() family of functions is in sys/kern/kern_tc.c as a part
     of the timecounter(9) framework.

     The implementation of the time counter sources used by the timecounter(9) is machine depen-
     dent, hence its location in the source code tree varies from architecture to architecture.

AUTHORS
     This manual page was written by Jeremy Cooper and
     Kelly Yancey <kbyanc@posi.net>.

BUGS
     Despite the guarantee that the system realtime clock will always be monotonically increas-
     ing, it is always possible for the system clock to be manually reset by the system adminis-
     trator to any date.

BSD					   June 8, 2010 				      BSD


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