git.m6w6.name Git - m6w6/libmemcached/blob - libtest/timer.hpp

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   3  *  Data Differential YATL (i.e. libtest)  library
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  36
  37 #pragma once
  38
  39 #include <cstdlib>
  40 #include <ctime>
  41 #include <iostream>
  42
  43 #ifdef __MACH__
  44 #  include <mach/clock.h>
  45 #  include <mach/mach.h>
  46 #else
  47 #  include <sys/time.h>
  48 #endif
  49
  50
  51 namespace libtest {
  52
  53 class Timer {
  54 public:
  55
  56   Timer()
  57   {
  58     _begin.tv_sec= 0;
  59     _begin.tv_nsec= 0;
  60     _end.tv_sec= 0;
  61     _end.tv_nsec= 0;
  62   }
  63
  64   void reset()
  65   {
  66     _end.tv_sec= 0;
  67     _end.tv_nsec= 0;
  68     _time(_begin);
  69   }
  70
  71   void sample()
  72   {
  73     _time(_end);
  74   }
  75
  76   void offset(int64_t minutes_arg, int64_t seconds_arg, int64_t nanoseconds)
  77   {
  78     reset();
  79     _end= _begin;
  80     _end.tv_sec+= (minutes_arg * 60) +seconds_arg;
  81     _end.tv_nsec+= nanoseconds;
  82   }
  83
  84   int64_t minutes()
  85   {
  86     struct timespec result;
  87     difference(result);
  88     return int64_t(result.tv_sec / 60);
  89   }
  90
  91   uint64_t elapsed_milliseconds() const
  92   {
  93     struct timespec temp;
  94     difference(temp);
  95
  96     return temp.tv_sec*1000 +temp.tv_nsec/1000000;
  97   }
  98
  99   void difference(struct timespec& arg) const
 100   {
 101     if ((_end.tv_nsec -_begin.tv_nsec) < 0)
 102     {
 103       arg.tv_sec= _end.tv_sec -_begin.tv_sec -1;
 104       arg.tv_nsec= 1000000000 +_end.tv_nsec -_begin.tv_nsec;
 105
 106     }
 107     else
 108     {
 109       arg.tv_sec= _end.tv_sec -_begin.tv_sec;
 110       arg.tv_nsec= _end.tv_nsec -_begin.tv_nsec;
 111     }
 112   }
 113
 114 private:
 115   void _time(struct timespec& ts)
 116   {
 117 #ifdef __MACH__ // OSX lacks clock_gettime()
 118     clock_serv_t _clock_serv;
 119     mach_timespec_t _mach_timespec;
 120     host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &_clock_serv);
 121     clock_get_time(_clock_serv, &_mach_timespec);
 122     mach_port_deallocate(mach_task_self(), _clock_serv);
 123     ts.tv_sec= _mach_timespec.tv_sec;
 124     ts.tv_nsec= _mach_timespec.tv_nsec;
 125 #else
 126     clock_gettime(CLOCK_REALTIME, &ts);
 127 #endif
 128   }
 129
 130 private:
 131   struct timespec _begin;
 132   struct timespec _end;
 133 };
 134
 135 std::ostream& operator<<(std::ostream& output, const libtest::Timer& arg);
 136
 137 } // namespace libtest