~teejee2008/timeshift/trunk

 

/*

 * ProcStats.vala

 *

 * Copyright 2016 Tony George <teejee2008@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA 02110-1301, USA.

 *

 *

 */

 

using TeeJee.Logging;

using TeeJee.FileSystem;

using TeeJee.ProcessHelper;

 

public class ProcStats : GLib.Object {

                public double user = 0;

                public double nice = 0;

                public double system = 0;

                public double idle = 0;

                public double iowait = 0;

 

                public double user_delta = 0;

                public double nice_delta = 0;

                public double system_delta = 0;

                public double idle_delta = 0;

                public double iowait_delta = 0;

 

                public double usage_percent = 0;

 

                public static ProcStats stat_prev = null;

 

                public ProcStats(string line){

                        string[] arr = line.split(" ");

                        int col = 0;

                        if (arr[col++] == "cpu"){

                                if (arr[col].length == 0){ col++; };

 

                                user = double.parse(arr[col++]);

                                nice = double.parse(arr[col++]);

                                system = double.parse(arr[col++]);

                                idle = double.parse(arr[col++]);

                                iowait = double.parse(arr[col++]);

 

                                if (ProcStats.stat_prev != null){

                                        user_delta = user - ProcStats.stat_prev.user;

                                        nice_delta = nice - ProcStats.stat_prev.nice;

                                        system_delta = system - ProcStats.stat_prev.system;

                                        idle_delta = idle - ProcStats.stat_prev.idle;

                                        iowait_delta = iowait - ProcStats.stat_prev.iowait;

 

                                        usage_percent = (user_delta + nice_delta + system_delta) * 100 / (user_delta + nice_delta + system_delta + idle_delta);

                                }

                                else{

                                        usage_percent = 0;

 

                                }

 

                                ProcStats.stat_prev = this;

                        }

                }

                

                //returns 0 when it is called first time

                public static double get_cpu_usage(){

                        string txt = file_read("/proc/stat");

                        foreach(string line in txt.split("\n")){

                                string[] arr = line.split(" ");

                                if (arr[0] == "cpu"){

                                        ProcStats stat = new ProcStats(line);

                                        return stat.usage_percent;

                                }

                        }

                        return 0;

                }

        }