D:/VL/BuildSystem/VL_DISTRO/Visualization_Library_SDK/src/vlCore/Time.cpp

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#include <vlCore/Time.hpp>
#include <ctime>
#include <cmath>

// mingw and msvc
#if defined(_WIN32)
  #include <windows.h>
// linux and mac
#elif defined(__GNUG__)
  #include <sys/time.h> // gettimeofday()
  #include <unistd.h> // usleep()
#endif

using namespace vl;

namespace
{
  double init_start_time()
  {
    #if defined(_WIN32)
      // Win32
      LARGE_INTEGER Frequency;
      LARGE_INTEGER PerformanceCount;
      BOOL has_timer = QueryPerformanceFrequency( &Frequency );
      if (has_timer)
      {
        QueryPerformanceCounter( &PerformanceCount );
        return (double)PerformanceCount.QuadPart/Frequency.QuadPart;
      }
      else
      {
        return GetTickCount() / 1000.0;
      }
    #elif defined(__GNUG__)
      struct timeval tv;
      gettimeofday( &tv, NULL );
      return tv.tv_sec + tv.tv_usec * 0.000001;
    #endif
  }
  double mStartTime =  init_start_time();
}

//-----------------------------------------------------------------------------
// Time
//-----------------------------------------------------------------------------
Time::Time()
{
  VL_DEBUG_SET_OBJECT_NAME()

  for(int i=0; i<VL_MAX_TIMERS; ++i)
    mStart[i] = -1;

  #if defined(_WIN32)
    SYSTEMTIME local_time;
    GetLocalTime(&local_time);
    mYear = local_time.wYear;
    mMonth = local_time.wMonth;
    mDayOfWeek = local_time.wDayOfWeek;
    mDayOfMonth = local_time.wDay;
    mHour = local_time.wHour;
    mMinute = local_time.wMinute;
    mSecond = local_time.wSecond;
    mMicrosecond = local_time.wMilliseconds * 1000;
  #elif defined(__GNUG__)
    time_t secs;
    ::time(&secs);
    tm* date = localtime( &secs );

    mYear = date->tm_year + 1900;
    mMonth = date->tm_mon;
    mDayOfWeek = date->tm_wday;
    mDayOfMonth = date->tm_mday;
    mHour = date->tm_hour;
    mMinute = date->tm_min;
    mSecond = date->tm_sec;

    struct timeval tv;
    gettimeofday( &tv, NULL );
    mMicrosecond = tv.tv_usec;
  #endif
}
//-----------------------------------------------------------------------------
Real Time::currentTime()
{
  #if defined(_WIN32)
    // Win32
    LARGE_INTEGER Frequency;
    LARGE_INTEGER PerformanceCount;
    BOOL has_timer = QueryPerformanceFrequency( &Frequency );
    if (has_timer)
    {
      QueryPerformanceCounter( &PerformanceCount );
      return (Real)PerformanceCount.QuadPart/Frequency.QuadPart  - mStartTime;
    }
    else
    {
      return (Real)(GetTickCount() / 1000.0 - mStartTime);
    }
  #elif defined(__GNUG__)
    struct timeval tv;
    gettimeofday( &tv, NULL );
    return (Real)(tv.tv_sec + tv.tv_usec * 0.000001 - mStartTime);
  #endif
}
//-----------------------------------------------------------------------------
void Time::sleep(unsigned int milliseconds)
{
  #if defined(_WIN32)
    Sleep(milliseconds);
  #elif defined(__GNUG__)
    usleep(milliseconds*1000);
  #endif
}
//-----------------------------------------------------------------------------