'\" t
.\"     Title: handle_early_requeue_pi_wakeup
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: May 2018
.\"    Manual: Futex API reference
.\"    Source: Kernel Hackers Manual 3.16.56
.\"  Language: English
.\"
.TH "HANDLE_EARLY_REQUEUE" "9" "May 2018" "Kernel Hackers Manual 3\&.16\&" "Futex API reference"
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.SH "NAME"
handle_early_requeue_pi_wakeup \- Detect early wakeup on the initial futex
.SH "SYNOPSIS"
.HP \w'int\ handle_early_requeue_pi_wakeup('u
.BI "int handle_early_requeue_pi_wakeup(struct\ futex_hash_bucket\ *\ " "hb" ", struct\ futex_q\ *\ " "q" ", union\ futex_key\ *\ " "key2" ", struct\ hrtimer_sleeper\ *\ " "timeout" ");"
.SH "ARGUMENTS"
.PP
\fIhb\fR
.RS 4
the hash_bucket futex_q was original enqueued on
.RE
.PP
\fIq\fR
.RS 4
the futex_q woken while waiting to be requeued
.RE
.PP
\fIkey2\fR
.RS 4
the futex_key of the requeue target futex
.RE
.PP
\fItimeout\fR
.RS 4
the timeout associated with the wait (NULL if none)
.RE
.SH "DESCRIPTION"
.PP
Detect if the task was woken on the initial futex as opposed to the requeue target futex\&. If so, determine if it was a timeout or a signal that caused the wakeup and return the appropriate error code to the caller\&. Must be called with the hb lock held\&.
.SH "RETURN"
.PP
0 = no early wakeup detected; <0 = \-ETIMEDOUT or \-ERESTARTNOINTR
.SH "AUTHOR"
.PP
\fBRusty Russell\fR <\&rusty@rustcorp.com.au\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br