xbmc/platform/posix/PosixResourceCounter.cpp

   1 /*
   2  *  Copyright (C) 2005-2018 Team Kodi
   3  *  This file is part of Kodi - https://kodi.tv
   4  *
   5  *  SPDX-License-Identifier: GPL-2.0-or-later
   6  *  See LICENSES/README.md for more information.
   7  */
   8
   9 #include "PosixResourceCounter.h"
  10
  11 #include "utils/log.h"
  12
  13 #include <errno.h>
  14
  15 #include "PlatformDefs.h"
  16
  17 CPosixResourceCounter::CPosixResourceCounter()
  18 {
  19   Reset();
  20 }
  21
  22 CPosixResourceCounter::~CPosixResourceCounter() = default;
  23
  24 double CPosixResourceCounter::GetCPUUsage()
  25 {
  26   struct timeval tmNow;
  27   if (gettimeofday(&tmNow, NULL) == -1)
  28     CLog::Log(LOGERROR, "error {} in gettimeofday", errno);
  29   else
  30   {
  31     double dElapsed = ( ((double)tmNow.tv_sec + (double)tmNow.tv_usec / 1000000.0) -
  32                  ((double)m_tmLastCheck.tv_sec + (double)m_tmLastCheck.tv_usec / 1000000.0) );
  33
  34     if (dElapsed >= 3.0)
  35     {
  36       struct rusage usage;
  37       if (getrusage(RUSAGE_SELF, &usage) == -1)
  38         CLog::Log(LOGERROR, "error {} in getrusage", errno);
  39       else
  40       {
  41         double dUser = ( ((double)usage.ru_utime.tv_sec + (double)usage.ru_utime.tv_usec / 1000000.0) -
  42                          ((double)m_usage.ru_utime.tv_sec + (double)m_usage.ru_utime.tv_usec / 1000000.0) );
  43         double dSys  = ( ((double)usage.ru_stime.tv_sec + (double)usage.ru_stime.tv_usec / 1000000.0) -
  44                   ((double)m_usage.ru_stime.tv_sec + (double)m_usage.ru_stime.tv_usec / 1000000.0) );
  45
  46         m_tmLastCheck = tmNow;
  47         m_usage = usage;
  48         m_dLastUsage = ((dUser+dSys) / dElapsed) * 100.0;
  49         return m_dLastUsage;
  50       }
  51     }
  52   }
  53
  54   return m_dLastUsage;
  55 }
  56
  57 void CPosixResourceCounter::Reset()
  58 {
  59   if (gettimeofday(&m_tmLastCheck, NULL) == -1)
  60     CLog::Log(LOGERROR, "error {} in gettimeofday", errno);
  61
  62   if (getrusage(RUSAGE_SELF, &m_usage) == -1)
  63     CLog::Log(LOGERROR, "error {} in getrusage", errno);
  64
  65   m_dLastUsage = 0.0;
  66 }
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