bintime, getbintime, microtime, getmicrotime, nanotime, getnanotime — get the current time
Contents
Description
The bintime() and getbintime() functions store the system time as a structbintime at the addresses
specified by bt. The microtime() and getmicrotime() functions perform the same utility, but record the
time as a structtimeval instead. Similarly the nanotime() and getnanotime() functions store the time as
a structtimespec.
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.
History
The bintime 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.
Name
bintime, getbintime, microtime, getmicrotime, nanotime, getnanotime — get the current time
See Also
binuptime(9), getbinuptime(9), getmicrouptime(9), getnanouptime(9), microuptime(9), nanouptime(9), tvtohz(9)
Synopsis
#include<sys/time.h>voidbintime(structbintime*bt);
voidgetbintime(structbintime*bt);
voidmicrotime(structtimeval*tv);
voidgetmicrotime(structtimeval*tv);
voidnanotime(structtimespec*ts);
voidgetnanotime(structtimespec*tsp);
