'\" t
.\"     Title: mod_timer
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Driver Basics
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "MOD_TIMER" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Driver Basics"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
mod_timer \- modify a timer\*(Aqs timeout
.SH "SYNOPSIS"
.HP \w'int\ mod_timer('u
.BI "int mod_timer(struct\ timer_list\ *\ " "timer" ", unsigned\ long\ " "expires" ");"
.SH "ARGUMENTS"
.PP
\fItimer\fR
.RS 4
the timer to be modified
.RE
.PP
\fIexpires\fR
.RS 4
new timeout in jiffies
.RE
.SH "DESCRIPTION"
.PP
\fBmod_timer\fR
is a more efficient way to update the expire field of an active timer (if the timer is inactive it will be activated)
.PP
mod_timer(timer, expires) is equivalent to:
.PP
del_timer(timer); timer\->expires = expires; add_timer(timer);
.PP
Note that if there are multiple unserialized concurrent users of the same timer, then
\fBmod_timer\fR
is the only safe way to modify the timeout, since
\fBadd_timer\fR
cannot modify an already running timer\&.
.PP
The function returns whether it has modified a pending timer or not\&. (ie\&.
\fBmod_timer\fR
of an inactive timer returns 0,
\fBmod_timer\fR
of an active timer returns 1\&.)
.SH "COPYRIGHT"
.br