mirror of
https://github.com/FeralInteractive/gamemode.git
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62865b1e32
This commit allows changing the io priority of the client to a value specified in the configuration file. That can possibly reduce lags or latency when a game has to load assets on demand and you have background IO activity running (or other concurrent IO). Signed-off-by: Kai Krakow <kai@kaishome.de>
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/*
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Copyright (c) 2017-2018, Feral Interactive
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Feral Interactive nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#define _GNU_SOURCE
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#include <sys/syscall.h>
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#include <unistd.h>
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/**
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* Define the syscall interface in Linux because it is missing from glibc
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*/
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#ifndef IOPRIO_BITS
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#define IOPRIO_BITS (16)
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#endif
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#ifndef IOPRIO_CLASS_SHIFT
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#define IOPRIO_CLASS_SHIFT (13)
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#endif
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#ifndef IOPRIO_PRIO_MASK
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#define IOPRIO_PRIO_MASK ((1UL << IOPRIO_CLASS_SHIFT) - 1)
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#endif
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#ifndef IOPRIO_PRIO_CLASS
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#define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT)
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#endif
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#ifndef IOPRIO_PRIO_DATA
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#define IOPRIO_PRIO_DATA(mask) ((mask)&IOPRIO_PRIO_MASK)
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#endif
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#ifndef IOPRIO_PRIO_VALUE
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#define IOPRIO_PRIO_VALUE(class, data) (((class) << IOPRIO_CLASS_SHIFT) | data)
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#endif
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enum {
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IOPRIO_CLASS_NONE,
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IOPRIO_CLASS_RT,
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IOPRIO_CLASS_BE,
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IOPRIO_CLASS_IDLE,
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};
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enum {
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IOPRIO_WHO_PROCESS = 1,
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IOPRIO_WHO_PGRP,
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IOPRIO_WHO_USER,
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};
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static inline int ioprio_set(int which, int who, int ioprio)
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{
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return (int)syscall(SYS_ioprio_set, which, who, ioprio);
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}
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