NAME

       Linux::IO_Prio - Interface to Linux ioprio_set and ioprio_get via syscall or ionice
       wrapper.

SYNOPSIS

               use Linux::IO_Prio qw(:all);

               my $status = ioprio_set(IOPRIO_WHO_PROCESS, $$,
                       IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0));

               my $status = ionice(IOPRIO_WHO_PROCESS, $$, IOPRIO_CLASS_IDLE, 0);

DESCRIPTION

       Use ioprio_get(2) and ioprio_set(2) from Perl.  Only Linux is supported currently. Support
       for other unices will be added once the kernel capabilities are available.

Exports

       Nothing by default.

       The required exports can be specified individually or by tag:

       :ionice -- ionice ionice_data ionice_class
       :c_api -- ioprio_set ioprio_get
       :macro -- IOPRIO_PRIO_VALUE IOPRIO_PRIO_CLASS IOPRIO_PRIO_DATA
       :who -- IOPRIO_WHO_PROCESS IOPRIO_WHO_PGRP IOPRIO_WHO_USER
       :class -- IOPRIO_CLASS_NONE IOPRIO_CLASS_RT IOPRIO_CLASS_BE IOPRIO_CLASS_IDLE
       :all -- all the above

       ionice(), ionice_class() and ionice_data() are thin wrappers around the C API allowing
       conventient single function calls.  All of the other exports have the same meaning and
       prototypes as the C API equivalents. See man ioprio_set(2) for further details.

   Functions
       C API

       $priority = ioprio_get($which, $who)
       $staus = ioprio_set($which, $who, $priority)

       Wrappers

       $status = ionice($which, $who, $class, $data)
       $class = ionice_class($which, $who)
       $data = ionice_data($which, $who)

   MACROS
       $priority = IOPRIO_PRIO_VALUE($class, $data)
       $class = IOPRIO_PRIO_CLASS($mask)
       $data = IOPRIO_PRIO_DATA ($mask)

   CONSTANTS
       IOPRIO_WHO_PROCESS
       IOPRIO_WHO_PGRP
       IOPRIO_WHO_USER
       IOPRIO_CLASS_NONE
       IOPRIO_CLASS_RT
       IOPRIO_CLASS_BE
       IOPRIO_CLASS_IDLE

COPYRIGHT

       This module is Copyright (c) 2011 Mark Hindley

       All rights reserved.

       You may distribute under the terms of either the GNU General Public License or the
       Artistic License, as specified in the Perl README file.  If you need more liberal
       licensing terms, please contact the maintainer.

WARRANTY

       This is free software. IT COMES WITHOUT WARRANTY OF ANY KIND.

AUTHOR

       Mark Hindley <mark@hindley.org.uk>