time.H

Go to the documentation of this file.

#ifndef  TIME_H
#define TIME_H

#include "platform.H" /* gives windows.h or the *nix equiv that serves up sys/time.h*/

#ifdef WIN32

inline double the_time() 
{
   LARGE_INTEGER freq, tick;

   //If the high precision counter is supported, these return true
   //and give MUCH better resolution (micro seconds vs. 10s of miliseconds)
   if (QueryPerformanceFrequency(&freq) && QueryPerformanceCounter(&tick))
   {
      //Division of __int64's drops too much precision.
      //return double(tick.QuadPart/freq.QuadPart);

      //Premultiplying __int64's before division yields overflows.
      //return double(tick.QuadPart*100000/freq.QuadPart)/100000.0;

      //Convert to Intel's 80bit doubles!
      long double dtick = long double(tick.QuadPart);
      long double dfreq = long double(freq.QuadPart);
      return dtick/dfreq;
   }
   else
   {
      return double(GetTickCount())/1000.0;
   }
}
    
inline double the_time_ms() 
{
   LARGE_INTEGER freq, tick;

   if (QueryPerformanceFrequency(&freq) && QueryPerformanceCounter(&tick))
   {
      long double dtick = long double(tick.QuadPart);
      long double dfreq = long double(freq.QuadPart);
      return dtick/dfreq*1000.0;
      //return double(tick.QuadPart*100000/freq.QuadPart)/100.0;
      //return double(tick.QuadPart*1000/freq.QuadPart);
   }
   else
   {
      return double(GetTickCount());
   }
}

#else

inline double the_time() 
{
    struct timeval ts; struct timezone tz;
    gettimeofday(&ts, &tz);
    return (double)(ts.tv_sec + ts.tv_usec/1e6);
}
inline double the_time_ms() 
{
    struct timeval ts; struct timezone tz;
    gettimeofday(&ts, &tz);
    return (double)(ts.tv_sec*1e3 + ts.tv_usec/1e3);
}

#endif

#endif

---