src/Thread_CPUObserver.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // LameXP - Audio Encoder Front-End
   3 // Copyright (C) 2004-2011 LoRd_MuldeR <MuldeR2@GMX.de>
   4 //
   5 // This program is free software; you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation; either version 2 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // This program is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License along
  16 // with this program; if not, write to the Free Software Foundation, Inc.,
  17 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 //
  19 // http://www.gnu.org/licenses/gpl-2.0.txt
  20 ///////////////////////////////////////////////////////////////////////////////
  21
  22 #include "Thread_CPUObserver.h"
  23 #include "Global.h"
  24
  25 #include <QDir>
  26 #include <QLibrary>
  27
  28 typedef BOOL (WINAPI *GetSystemTimesPtr)(LPFILETIME lpIdleTime, LPFILETIME lpKernelTime, LPFILETIME lpUserTime);
  29
  30 ////////////////////////////////////////////////////////////
  31 // Constructor & Destructor
  32 ////////////////////////////////////////////////////////////
  33
  34 CPUObserverThread::CPUObserverThread(void)
  35 {
  36 }
  37
  38 CPUObserverThread::~CPUObserverThread(void)
  39 {
  40 }
  41
  42 ////////////////////////////////////////////////////////////
  43 // Protected functions
  44 ////////////////////////////////////////////////////////////
  45
  46 void CPUObserverThread::run(void)
  47 {
  48         qDebug("CPU observer started!");
  49
  50         try
  51         {
  52                 observe();
  53         }
  54         catch(...)
  55         {
  56                 fflush(stdout);
  57                 fflush(stderr);
  58                 fprintf(stderr, "\nGURU MEDITATION !!!\n");
  59                 FatalAppExit(0, L"Unhandeled exception error, application will exit!");
  60                 TerminateProcess(GetCurrentProcess(), -1);
  61         }
  62
  63         while(m_semaphore.available()) m_semaphore.tryAcquire();
  64 }
  65
  66 ULONGLONG CPUObserverThread::filetime2ulonglong(const void *ftime)
  67 {
  68         ULARGE_INTEGER tmp; tmp.QuadPart = 0UI64;
  69         const FILETIME* fileTime = reinterpret_cast<const FILETIME*>(ftime);
  70         tmp.LowPart = fileTime->dwLowDateTime;
  71         tmp.HighPart = fileTime->dwHighDateTime;
  72         return tmp.QuadPart;
  73 }
  74
  75 void CPUObserverThread::observe(void)
  76 {
  77         QLibrary kernel32("kernel32.dll");
  78         GetSystemTimesPtr getSystemTimes = NULL;
  79
  80         if(kernel32.load())
  81         {
  82                 getSystemTimes = reinterpret_cast<GetSystemTimesPtr>(kernel32.resolve("GetSystemTimes"));
  83         }
  84
  85         if(getSystemTimes != NULL)
  86         {
  87                 bool first = true;
  88                 double previous = -1.0;
  89                 FILETIME sysTime, usrTime, idlTime;
  90                 ULONGLONG sys[2], usr[2], idl[2];
  91
  92                 for(size_t i = 0; i < 2; i++)
  93                 {
  94                         sys[i] = 0; usr[i] = 0; idl[i] = 0;
  95                 }
  96
  97                 forever
  98                 {
  99                         if(getSystemTimes(&idlTime, &sysTime, &usrTime))
 100                         {
 101                                 sys[1] = sys[0]; sys[0] = filetime2ulonglong(&sysTime);
 102                                 usr[1] = usr[0]; usr[0] = filetime2ulonglong(&usrTime);
 103                                 idl[1] = idl[0]; idl[0] = filetime2ulonglong(&idlTime);
 104
 105                                 if(first)
 106                                 {
 107                                         first = false;
 108                                         emit currentUsageChanged(1.0);
 109                                         msleep(250);
 110                                         continue;
 111                                 }
 112
 113                                 ULONGLONG timeIdl = (idl[0] - idl[1]); //Idle time only
 114                                 ULONGLONG timeSys = (sys[0] - sys[1]); //Kernel mode time (incl. Idle time!)
 115                                 ULONGLONG timeUsr = (usr[0] - usr[1]); //User mode time only
 116
 117                                 ULONGLONG timeSum = timeUsr + timeSys; //Overall CPU time that has elapsed
 118                                 ULONGLONG timeWrk = timeSum - timeIdl; //Time the CPU spent working
 119
 120                                 if(timeSum > 0)
 121                                 {
 122                                         double current = static_cast<double>(timeWrk) / static_cast<double>(timeSum);
 123                                         if(current != previous)
 124                                         {
 125                                                 emit currentUsageChanged(current);
 126                                                 previous = current;
 127                                         }
 128                                 }
 129                         }
 130                         if(m_semaphore.tryAcquire(1, 2000)) break;
 131                 }
 132         }
 133         else
 134         {
 135                 qWarning("GetSystemTimes() ist not available on this system!");
 136         }
 137 }
 138
 139 ////////////////////////////////////////////////////////////
 140 // SLOTS
 141 ////////////////////////////////////////////////////////////
 142
 143 /*NONE*/
 144
 145 ////////////////////////////////////////////////////////////
 146 // EVENTS
 147 ////////////////////////////////////////////////////////////
 148
 149 /*NONE*/