mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
93 lines
2.7 KiB
Groff
93 lines
2.7 KiB
Groff
.\"
|
|
.\" Copyright (c) 1996 Joerg Wunsch
|
|
.\"
|
|
.\" 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 DEVELOPERS ``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 DEVELOPERS 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.
|
|
.\"
|
|
.\" $Id$
|
|
.\" "
|
|
.Dd April 13, 1996
|
|
.Os
|
|
.Dt TIMEOUT 9
|
|
.Sh NAME
|
|
.Nm timeout ,
|
|
.Nm untimeout
|
|
.Nd schedule timer events
|
|
.Sh SYNOPSIS
|
|
.Fd #include <sys/systm.h>
|
|
.Fd #include <sys/kernel.h>
|
|
|
|
.Ft typedef void \*(lptimeout_t\*(rp \*(lpvoid *\*(rp;
|
|
|
|
.Ft typedef timeout_t *timeout_func_t;
|
|
|
|
.Ft void
|
|
.Fn timeout "timeout_func_t func" "void *arg" "int ticks"
|
|
.Ft void
|
|
.Fn untimeout "timeout_func_t func" "void *arg"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm timeout
|
|
facility allows the execution of a function after a specified amount
|
|
of time. The function
|
|
.Ar func
|
|
is being called with the opaque argument
|
|
.Ar arg
|
|
after
|
|
.Ar ticks
|
|
timer ticks have been elapsed. It's often convenient to use the
|
|
external variable
|
|
.Dv hz
|
|
to compute the amount of
|
|
.Ar ticks
|
|
to wait.
|
|
.Pp
|
|
If the timeout event should be removed before the timer expires,
|
|
.Nm untimeout
|
|
must be called with the exact
|
|
.Ar func
|
|
and
|
|
.Ar arg
|
|
arguments as the corresponding call to
|
|
.Fn timeout .
|
|
.Pp
|
|
Unlike the functions of
|
|
.Xr sleep 9 ,
|
|
.Fn timeout
|
|
and
|
|
.Fn untimeout
|
|
can be called from within an interrupt context.
|
|
.Sh SEE ALSO
|
|
.Xr sleep 9
|
|
.Sh HISTORY
|
|
The
|
|
.Nm timeout
|
|
facility is very old.
|
|
.Sh BUGS
|
|
Since the timer queue is sorted and uses time differences rather than
|
|
absolute times, inserting and removing timer events can be costly if
|
|
it is done too frequently.
|
|
.Sh AUTHORS
|
|
This man page has been written by
|
|
.ie t J\(:org Wunsch.
|
|
.el Joerg Wunsch.
|