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