'\" t
.\"     Title: __atomic_add_unless
.\"    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 "__ATOMIC_ADD_UNLESS" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Driver Basics"
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.SH "NAME"
__atomic_add_unless \- add unless the number is already a given value
.SH "SYNOPSIS"
.HP \w'int\ __atomic_add_unless('u
.BI "int __atomic_add_unless(atomic_t\ *\ " "v" ", int\ " "a" ", int\ " "u" ");"
.SH "ARGUMENTS"
.PP
\fIv\fR
.RS 4
pointer of type atomic_t
.RE
.PP
\fIa\fR
.RS 4
the amount to add to v\&.\&.\&.
.RE
.PP
\fIu\fR
.RS 4
\&.\&.\&.unless v is equal to u\&.
.RE
.SH "DESCRIPTION"
.PP
Atomically adds
\fIa\fR
to
\fIv\fR, so long as
\fIv\fR
was not already
\fIu\fR\&. Returns the old value of
\fIv\fR\&.
.SH "COPYRIGHT"
.br