git.m6w6.name Git - awesomized/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 <ctime>
  40 #include <ostream>
  41
  42 #ifdef __MACH__
  43 #  include <mach/clock.h>
  44 #  include <mach/mach.h>
  45 #else
  46 #  include <sys/time.h>
  47 #endif
  48
  49
  50 namespace libtest {
  51
  52 class Timer {
  53 public:
  54
  55   Timer()
  56   {
  57     _begin.tv_sec= 0;
  58     _begin.tv_nsec= 0;
  59     _end.tv_sec= 0;
  60     _end.tv_nsec= 0;
  61   }
  62
  63   void reset()
  64   {
  65     _end.tv_sec= 0;
  66     _end.tv_nsec= 0;
  67     _time(_begin);
  68   }
  69
  70   void sample()
  71   {
  72     _time(_end);
  73   }
  74
  75   void difference(struct timespec& arg) const
  76   {
  77     if ((_end.tv_nsec -_begin.tv_nsec) < 0)
  78     {
  79       arg.tv_sec= _end.tv_sec -_begin.tv_sec-1;
  80       arg.tv_nsec= 1000000000 +_end.tv_nsec -_begin.tv_nsec;
  81
  82     }
  83     else
  84     {
  85       arg.tv_sec= _end.tv_sec -_begin.tv_sec;
  86       arg.tv_nsec= _end.tv_nsec -_begin.tv_nsec;
  87     }
  88   }
  89
  90 private:
  91   void _time(struct timespec& ts)
  92   {
  93 #ifdef __MACH__ // OSX lacks clock_gettime()
  94     clock_serv_t _clock_serv;
  95     mach_timespec_t _mach_timespec;
  96     host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &_clock_serv);
  97     clock_get_time(_clock_serv, &_mach_timespec);
  98     mach_port_deallocate(mach_task_self(), _clock_serv);
  99     ts.tv_sec= _mach_timespec.tv_sec;
 100     ts.tv_nsec= _mach_timespec.tv_nsec;
 101 #else
 102     clock_gettime(CLOCK_REALTIME, &ts);
 103 #endif
 104   }
 105
 106 private:
 107   struct timespec _begin;
 108   struct timespec _end;
 109 };
 110
 111 std::ostream& operator<<(std::ostream& output, const libtest::Timer& arg);
 112
 113 } // namespace libtest