include/NanoTimer.h

   1 /***************************************************************************
   2  *                                                                         *
   3  *    Copyright (C) Lakshya Solutions Ltd. All rights reserved.            *
   4  *                                                                         *
   5  ***************************************************************************/
   6
   7 #ifndef NANO_TIMER_H
   8 #define NANO_TIMER_H
   9 #include<time.h>
  10 #include<limits.h>
  11 class DllExport NanoTimer
  12 {
  13     long long max_, min_, total, count, last_;
  14 #ifdef WINNT
  15         unsigned __int64 begin, end;
  16 #else
  17         struct timespec begin;
  18     struct timespec end;
  19 #endif
  20     public:
  21     NanoTimer() {  reset(); }
  22     void reset() {  max_ = 0; min_ = LONG_MAX; total =0; count = 0; last_ =0; }
  23     void start()
  24     {
  25         count++;
  26 #ifdef WINNT
  27         FILETIME ft;
  28         begin = 0;
  29         GetSystemTimeAsFileTime(&ft);
  30         // The GetSystemTimeAsFileTime returns the number of 100 nanosecond
  31         // intervals since Jan 1, 1601 in a structure. Copy the high bits to
  32         // the 64 bit tmpres, shift it left by 32 then or in the low 32 bits.
  33         begin |= ft.dwHighDateTime;
  34         begin <<= 32;
  35         begin |= ft.dwLowDateTime;
  36 #else
  37                 clock_gettime(CLOCK_REALTIME, &begin);
  38 #endif
  39     }
  40     void stop()
  41     {
  42 #ifdef WINNT
  43         FILETIME ft;
  44         end = 0;
  45         GetSystemTimeAsFileTime(&ft);
  46         // The GetSystemTimeAsFileTime returns the number of 100 nanosecond
  47         // intervals since Jan 1, 1601 in a structure. Copy the high bits to
  48         // the 64 bit tmpres, shift it left by 32 then or in the low 32 bits.
  49         end |= ft.dwHighDateTime;
  50         end <<= 32;
  51         end |= ft.dwLowDateTime;
  52                 last_ = end - begin;
  53 #else
  54         clock_gettime(CLOCK_REALTIME, &end);
  55         long long secs = end.tv_sec-begin.tv_sec;
  56         long long nano = end.tv_nsec-begin.tv_nsec;
  57         last_ = (secs*1000000000)+nano;
  58 #endif
  59         total += last_;
  60         if ( max_ < last_ ) max_ = last_;
  61         if ( min_ > last_ ) min_ = last_;
  62     }
  63     long long last() { return last_; }
  64     long long avg() { return total/count; }
  65     long long sum() { return total; }
  66     long long minc() { return min_; }
  67     long long maxc() { return max_; }
  68 };
  69
  70 #endif