61 lines
2.2 KiB
Groff
61 lines
2.2 KiB
Groff
.\" $NetBSD: mstohz.9,v 1.6 2009/10/19 18:41:09 bouyer Exp $
|
|
.\"
|
|
.\" Copyright (c) 2002 Manuel Bouyer.
|
|
.\"
|
|
.\" 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 REGENTS 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 REGENTS 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.
|
|
.\"
|
|
.\"
|
|
.Dd April 4, 2002
|
|
.Dt MSTOHZ 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm mstohz
|
|
.Nd convert milliseconds to system clock ticks
|
|
.Sh SYNOPSIS
|
|
.In sys/param.h
|
|
.Ft int
|
|
.Fn mstohz "int ms"
|
|
.Sh DESCRIPTION
|
|
.Nm
|
|
can be used to convert time in milliseconds to system clock ticks, as used
|
|
by the
|
|
.Xr callout 9
|
|
facility, in an integer-overflow safe way.
|
|
.Pp
|
|
This function is implemented as a define in the
|
|
.Em \*[Lt]sys/param.h\*[Gt]
|
|
header.
|
|
Individual ports can have a processor-specific, more efficient
|
|
version implemented in their
|
|
.Em \*[Lt]machine/param.h\*[Gt]
|
|
header as a define.
|
|
.Sh RETURN VALUES
|
|
The return value is the number of clock ticks for the specified value.
|
|
.Sh SEE ALSO
|
|
.Xr callout 9
|
|
.Sh BUGS
|
|
The machine-independent
|
|
.Fn mstohz
|
|
function does not make use of expensive 64-bit integer arithmetic, so
|
|
the result will be rounded down to one second if the parameter is larger
|
|
than 131072 milliseconds.
|