122 lines
3.1 KiB
Groff
122 lines
3.1 KiB
Groff
.\" Copyright (c) 2000 Kelly Yancey
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd September 16, 2004
|
|
.Dt MICROTIME 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm bintime ,
|
|
.Nm getbintime ,
|
|
.Nm microtime ,
|
|
.Nm getmicrotime ,
|
|
.Nm nanotime ,
|
|
.Nm getnanotime
|
|
.Nd get the current time
|
|
.Sh SYNOPSIS
|
|
.In sys/time.h
|
|
.Ft void
|
|
.Fn bintime "struct bintime *bt"
|
|
.Ft void
|
|
.Fn getbintime "struct bintime *bt"
|
|
.Ft void
|
|
.Fn microtime "struct timeval *tv"
|
|
.Ft void
|
|
.Fn getmicrotime "struct timeval *tv"
|
|
.Ft void
|
|
.Fn nanotime "struct timespec *ts"
|
|
.Ft void
|
|
.Fn getnanotime "struct timespec *tsp"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn bintime
|
|
and
|
|
.Fn getbintime
|
|
functions store the system time as a
|
|
.Vt "struct bintime"
|
|
at the addresses specified by
|
|
.Fa bt .
|
|
The
|
|
.Fn microtime
|
|
and
|
|
.Fn getmicrotime
|
|
functions perform the same utility, but record the time as a
|
|
.Vt "struct timeval"
|
|
instead.
|
|
Similarly the
|
|
.Fn nanotime
|
|
and
|
|
.Fn getnanotime
|
|
functions store the time as a
|
|
.Vt "struct timespec" .
|
|
.Pp
|
|
The
|
|
.Fn bintime ,
|
|
.Fn microtime ,
|
|
and
|
|
.Fn nanotime
|
|
functions
|
|
always query the timecounter to return the current time as precisely as
|
|
possible.
|
|
Whereas
|
|
.Fn getbintime ,
|
|
.Fn getmicrotime ,
|
|
and
|
|
.Fn getnanotime
|
|
functions are abstractions which return a less precise, but
|
|
faster to obtain, time.
|
|
.Pp
|
|
The intent of the
|
|
.Fn getbintime ,
|
|
.Fn getmicrotime ,
|
|
and
|
|
.Fn getnanotime
|
|
functions is to enforce the user's preference for timer accuracy versus
|
|
execution time.
|
|
.Sh SEE ALSO
|
|
.Xr binuptime 9 ,
|
|
.Xr getbinuptime 9 ,
|
|
.Xr getmicrouptime 9 ,
|
|
.Xr getnanouptime 9 ,
|
|
.Xr microuptime 9 ,
|
|
.Xr nanouptime 9 ,
|
|
.Xr tvtohz 9
|
|
.Sh HISTORY
|
|
The
|
|
.Nm bintime
|
|
functions first appeared in
|
|
.Fx 5.0 .
|
|
The
|
|
.Nm microtime
|
|
and
|
|
.Nm nanotime
|
|
functions first appeared in
|
|
.Fx 3.0
|
|
but have existed in other incarnations since
|
|
.Bx 4.4 .
|
|
.Sh AUTHORS
|
|
This manual page was written by
|
|
.An Kelly Yancey Aq Mt kbyanc@posi.net .
|