include/NanoTimer.h

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by www.databasecache.com                           *
   3  *   Contact: praba_tuty@databasecache.com                                 *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15   ***************************************************************************/
  16 #ifndef NANO_TIMER_H
  17 #define NANO_TIMER_H
  18 #include<time.h>
  19 #include<limits.h>
  20 class NanoTimer
  21 {
  22     long long max_, min_, total, count, last_;
  23     struct timespec begin;
  24     struct timespec end;
  25
  26     public:
  27     NanoTimer() {  reset(); }
  28     void reset() {  max_ = 0; min_ = LONG_MAX; total =0; count = 0; last_ =0; }
  29     void start()
  30     {
  31         count++;
  32         clock_gettime(CLOCK_REALTIME, &begin);
  33     }
  34     void stop()
  35     {
  36         clock_gettime(CLOCK_REALTIME, &end);
  37         long long secs = end.tv_sec-begin.tv_sec;
  38         long long nano = end.tv_nsec-begin.tv_nsec;
  39         last_ = (secs*1000000000)+nano;
  40         total += last_;
  41         if ( max_ < last_ ) max_ = last_;
  42         if ( min_ > last_ ) min_ = last_;
  43     }
  44     long long last() { return last_; }
  45     long long avg() { return total/count; }
  46     long long min() { return min_; }
  47     long long max() { return max_; }
  48 };
  49
  50 #endif