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

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

     binuptime, getbinuptime, microuptime, getmicrouptime, nanouptime, getnanouptime -- get the
     time elapsed since boot

     #include <sys/time.h>

     binuptime(struct bintime *bt);

     getbinuptime(struct bintime *bt);

     microuptime(struct timeval *tv);

     getmicrouptime(struct timeval *tv);

     nanouptime(struct timespec *ts);

     getnanouptime(struct timespec *tsp);

     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.  Simi-
     larly the nanouptime() and getnanouptime() functions store the elapsed time as a struct
     timespec.	The used structures are described in timeval(3).

     The binuptime(), microuptime(), and nanouptime() functions always query the timecounter to
     return the current time as precisely as possible.	Whereas getbinuptime(), getmicrouptime(),
     and getnanouptime() functions are abstractions which return a less precise, but faster to
     obtain, time.

     The intent of the getbinuptime(), getmicrouptime(), and getnanouptime() 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 performance is priority.

     microtime(9), timecounter(9), tvtohz(9)

     This manual page was written by Kelly Yancey <kbyanc@posi.net>.

BSD					   June 8, 2010 				      BSD
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