File indexing completed on 2024-04-21 03:51:46

 /*
     This file is part of the KDE Project
     SPDX-FileCopyrightText: 2008 Sebastian Trueg <trueg@kde.org>
 
     Parts of this file are based on code from Strigi
     SPDX-FileCopyrightText: 2006-2007 Jos van den Oever <jos@vandenoever.info>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "priority.h"
 
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
 
 #include <QDebug>
 
 #include <sys/time.h>
 #include <sys/resource.h>
 
 #include <unistd.h>
 #ifndef _WIN32
 #include <sys/syscall.h>
 #include <cerrno>
 
 #include <sched.h>
 #endif
 
 #ifdef SYS_ioprio_set
 namespace {
 #ifndef IOPRIO_CLASS_IDLE
     enum {
         IOPRIO_CLASS_NONE,
         IOPRIO_CLASS_RT,
         IOPRIO_CLASS_BE,
         IOPRIO_CLASS_IDLE,
     };
 #endif
 
 #ifndef IOPRIO_WHO_PROCESS
     enum {
         IOPRIO_WHO_PROCESS = 1,
         IOPRIO_WHO_PGRP,
         IOPRIO_WHO_USER,
     };
 #endif
 
 #ifndef IOPRIO_CLASS_SHIFT
     const int IOPRIO_CLASS_SHIFT = 13;
 #endif
 }
 #endif
 
 bool lowerIOPriority()
 {
 #ifdef SYS_ioprio_set
     if ( syscall( SYS_ioprio_set, IOPRIO_WHO_PROCESS, 0, IOPRIO_CLASS_IDLE<<IOPRIO_CLASS_SHIFT ) < 0 ) {
         qDebug( "cannot set io scheduling to idle (%s). Trying best effort.\n",  strerror( errno ));
         if ( syscall( SYS_ioprio_set, IOPRIO_WHO_PROCESS, 0, 7|IOPRIO_CLASS_BE<<IOPRIO_CLASS_SHIFT ) < 0 ) {
             qDebug( "cannot set io scheduling to best effort.\n");
             return false;
         }
     }
     return true;
 #else
     return false;
 #endif
 }
 
 bool lowerPriority()
 {
 #ifndef Q_OS_WIN
     return !setpriority( PRIO_PROCESS, 0, 19 );
 #else
     return false;
 #endif
 }
 
 bool lowerSchedulingPriority()
 {
 #ifdef SCHED_BATCH
     struct sched_param param;
     memset( &param, 0, sizeof(param) );
     param.sched_priority = 0;
     return !sched_setscheduler( 0, SCHED_BATCH, &param );
 #else
     return false;
 #endif
 }
 
 bool setIdleSchedulingPriority()
 {
 #ifdef SCHED_IDLE
     struct sched_param param;
     memset( &param, 0, sizeof(param) );
     param.sched_priority = 0;
     return !sched_setscheduler( 0, SCHED_IDLE, &param );
 #else
     return false;
 #endif
 }