src/Thread_CPUObserver.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // LameXP - Audio Encoder Front-End
   3 // Copyright (C) 2004-2012 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 ////////////////////////////////////////////////////////////
  29
  30 typedef enum { SystemProcInfo = 8 } SYSTEM_INFO_CLASS;
  31
  32 typedef struct
  33 {
  34         LARGE_INTEGER IdleTime;
  35         LARGE_INTEGER KrnlTime;
  36         LARGE_INTEGER UserTime;
  37         LARGE_INTEGER Reserved[2];
  38         ULONG Reserved2;
  39 }
  40 SYSTEM_PROC_INFO;
  41
  42 typedef BOOL (WINAPI *GetSystemTimesPtr)(LPFILETIME lpIdleTime, LPFILETIME lpKernelTime, LPFILETIME lpUserTime);
  43 typedef LONG (WINAPI *NtQuerySystemInformationPtr)(SYSTEM_INFO_CLASS SystemInformationClass, PVOID SystemInformation, ULONG SystemInformationLength, PULONG ReturnLength);
  44
  45 #define IS_OK(X) (((LONG)(X)) == ((LONG)0x00000000L))
  46
  47 ////////////////////////////////////////////////////////////
  48 // Constructor & Destructor
  49 ////////////////////////////////////////////////////////////
  50
  51 CPUObserverThread::CPUObserverThread(void)
  52 {
  53 }
  54
  55 CPUObserverThread::~CPUObserverThread(void)
  56 {
  57 }
  58
  59 ////////////////////////////////////////////////////////////
  60 // Protected functions
  61 ////////////////////////////////////////////////////////////
  62
  63 void CPUObserverThread::run(void)
  64 {
  65         qDebug("CPU observer started!");
  66
  67         try
  68         {
  69                 observe();
  70         }
  71         catch(...)
  72         {
  73                 fflush(stdout);
  74                 fflush(stderr);
  75                 fprintf(stderr, "\nGURU MEDITATION !!!\n");
  76                 FatalAppExit(0, L"Unhandeled exception error, application will exit!");
  77                 TerminateProcess(GetCurrentProcess(), -1);
  78         }
  79
  80         while(m_semaphore.available()) m_semaphore.tryAcquire();
  81 }
  82
  83 ULONGLONG CPUObserverThread::filetime2ulonglong(const void *ftime)
  84 {
  85         ULARGE_INTEGER tmp; tmp.QuadPart = 0UI64;
  86         const FILETIME* fileTime = reinterpret_cast<const FILETIME*>(ftime);
  87         tmp.LowPart = fileTime->dwLowDateTime;
  88         tmp.HighPart = fileTime->dwHighDateTime;
  89         return tmp.QuadPart;
  90 }
  91
  92 void CPUObserverThread::observe(void)
  93 {
  94         QLibrary kernel32("kernel32.dll"), ntdll("ntdll.dll");
  95
  96         ULONG performanceInfoSize = 0;
  97         BYTE *performanceInfoBuffer = NULL;
  98         NtQuerySystemInformationPtr querySysInfo = NULL;
  99         GetSystemTimesPtr getSystemTimes = NULL;
 100
 101         if(kernel32.load())
 102         {
 103                 getSystemTimes = reinterpret_cast<GetSystemTimesPtr>(kernel32.resolve("GetSystemTimes"));
 104         }
 105
 106         if(!getSystemTimes)
 107         {
 108                 qWarning("GetSystemTimes() not found, falling back to NtQueryInformationProcess().");
 109                 if(ntdll.load())
 110                 {
 111                         querySysInfo = reinterpret_cast<NtQuerySystemInformationPtr>(ntdll.resolve("NtQuerySystemInformation"));
 112                         if(querySysInfo)
 113                         {
 114                                 querySysInfo(SystemProcInfo, &performanceInfoBuffer, 0, &performanceInfoSize);
 115                                 if(performanceInfoSize < sizeof(SYSTEM_PROC_INFO)) performanceInfoSize = sizeof(SYSTEM_PROC_INFO);
 116                                 performanceInfoBuffer = new BYTE[performanceInfoSize];
 117                         }
 118                 }
 119         }
 120
 121         if(getSystemTimes || (querySysInfo && performanceInfoBuffer))
 122         {
 123                 bool first = true;
 124                 double previous = -1.0;
 125                 FILETIME sysTime, usrTime, idlTime;
 126                 ULONGLONG sys[2], usr[2], idl[2];
 127
 128                 for(size_t i = 0; i < 2; i++)
 129                 {
 130                         sys[i] = 0; usr[i] = 0; idl[i] = 0;
 131                 }
 132
 133                 forever
 134                 {
 135                         bool ok = false;
 136
 137                         if(getSystemTimes)
 138                         {
 139                                 if(ok = getSystemTimes(&idlTime, &sysTime, &usrTime))
 140                                 {
 141                                         sys[1] = sys[0]; sys[0] = filetime2ulonglong(&sysTime);
 142                                         usr[1] = usr[0]; usr[0] = filetime2ulonglong(&usrTime);
 143                                         idl[1] = idl[0]; idl[0] = filetime2ulonglong(&idlTime);
 144                                 }
 145                         }
 146                         else
 147                         {
 148                                 if(ok = IS_OK(querySysInfo(SystemProcInfo, performanceInfoBuffer, performanceInfoSize, NULL)))
 149                                 {
 150                                         sys[1] = sys[0]; sys[0] = reinterpret_cast<SYSTEM_PROC_INFO*>(performanceInfoBuffer)[0].KrnlTime.QuadPart;
 151                                         usr[1] = usr[0]; usr[0] = reinterpret_cast<SYSTEM_PROC_INFO*>(performanceInfoBuffer)[0].UserTime.QuadPart;
 152                                         idl[1] = idl[0]; idl[0] = reinterpret_cast<SYSTEM_PROC_INFO*>(performanceInfoBuffer)[0].IdleTime.QuadPart;
 153                                 }
 154                         }
 155
 156                         if(ok)
 157                         {
 158                                 if(first)
 159                                 {
 160                                         first = false;
 161                                         emit currentUsageChanged(1.0);
 162                                         msleep(250);
 163                                         continue;
 164                                 }
 165
 166                                 ULONGLONG timeIdl = (idl[0] - idl[1]); //Idle time only
 167                                 ULONGLONG timeSys = (sys[0] - sys[1]); //Kernel mode time (incl. Idle time!)
 168                                 ULONGLONG timeUsr = (usr[0] - usr[1]); //User mode time only
 169
 170                                 ULONGLONG timeSum = timeUsr + timeSys; //Overall CPU time that has elapsed
 171                                 ULONGLONG timeWrk = timeSum - timeIdl; //Time the CPU spent working
 172
 173                                 if(timeSum > 0)
 174                                 {
 175                                         double current = static_cast<double>(timeWrk) / static_cast<double>(timeSum);
 176                                         if(current != previous)
 177                                         {
 178                                                 emit currentUsageChanged(current);
 179                                                 previous = current;
 180                                         }
 181                                 }
 182                         }
 183                         if(m_semaphore.tryAcquire(1, 2000)) break;
 184                 }
 185         }
 186         else
 187         {
 188                 qWarning("NtQueryInformationProcess() not available, giving up!");
 189         }
 190
 191         LAMEXP_DELETE_ARRAY(performanceInfoBuffer);
 192 }
 193
 194 ////////////////////////////////////////////////////////////
 195 // SLOTS
 196 ////////////////////////////////////////////////////////////
 197
 198 /*NONE*/
 199
 200 ////////////////////////////////////////////////////////////
 201 // EVENTS
 202 ////////////////////////////////////////////////////////////
 203
 204 /*NONE*/