'\" t
.\"     Title: futex_requeue
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: September 2017
.\"    Manual: Futex API reference
.\"    Source: Kernel Hackers Manual 4.12.13
.\"  Language: English
.\"
.TH "FUTEX_REQUEUE" "9" "September 2017" "Kernel Hackers Manual 4\&.12\&" "Futex API reference"
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.SH "NAME"
futex_requeue \- Requeue waiters from uaddr1 to uaddr2
.SH "SYNOPSIS"
.HP \w'int\ futex_requeue('u
.BI "int futex_requeue(u32\ __user\ *\ " "uaddr1" ", unsigned\ int\ " "flags" ", u32\ __user\ *\ " "uaddr2" ", int\ " "nr_wake" ", int\ " "nr_requeue" ", u32\ *\ " "cmpval" ", int\ " "requeue_pi" ");"
.SH "ARGUMENTS"
.PP
\fIu32 __user * uaddr1\fR
.RS 4
source futex user address
.RE
.PP
\fIunsigned int flags\fR
.RS 4
futex flags (FLAGS_SHARED, etc\&.)
.RE
.PP
\fIu32 __user * uaddr2\fR
.RS 4
target futex user address
.RE
.PP
\fIint nr_wake\fR
.RS 4
number of waiters to wake (must be 1 for requeue_pi)
.RE
.PP
\fIint nr_requeue\fR
.RS 4
number of waiters to requeue (0\-INT_MAX)
.RE
.PP
\fIu32 * cmpval\fR
.RS 4
\fIuaddr1\fR
expected value (or
\fBNULL\fR)
.RE
.PP
\fIint requeue_pi\fR
.RS 4
if we are attempting to requeue from a non\-pi futex to a pi futex (pi to pi requeue is not supported)
.RE
.SH "DESCRIPTION"
.PP
Requeue waiters on uaddr1 to uaddr2\&. In the requeue_pi case, try to acquire uaddr2 atomically on behalf of the top waiter\&.
.SH "RETURN"
.PP
>=0 \- on success, the number of tasks requeued or woken; <0 \- on error
.SH "AUTHOR"
.PP
\fBRusty Russell\fR <\&rusty@rustcorp.com.au\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br