File indexing completed on 2024-05-12 05:11:16

 /* 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>
 
 #ifndef _WIN32
 #include <cerrno>
 #include <sys/resource.h>
 #include <sys/syscall.h>
 #include <unistd.h>
 
 #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
 }