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 <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 <time.h>
  48 #  include <sys/time.h>
  49 #endif
  50
  51
  52 namespace libtest {
  53
  54 class Timer {
  55 public:
  56
  57   Timer()
  58   {
  59     _begin.tv_sec= 0;
  60     _begin.tv_nsec= 0;
  61     _end.tv_sec= 0;
  62     _end.tv_nsec= 0;
  63   }
  64
  65   void reset()
  66   {
  67     _end.tv_sec= 0;
  68     _end.tv_nsec= 0;
  69     _time(_begin);
  70   }
  71
  72   void sample()
  73   {
  74     _time(_end);
  75   }
  76
  77   void offset(int64_t minutes_arg, int64_t seconds_arg, int64_t nanoseconds)
  78   {
  79     reset();
  80     _end= _begin;
  81     _end.tv_sec+= (minutes_arg * 60) +seconds_arg;
  82     _end.tv_nsec+= nanoseconds;
  83   }
  84
  85   int64_t minutes()
  86   {
  87     struct timespec result;
  88     difference(result);
  89     return int64_t(result.tv_sec / 60);
  90   }
  91
  92   uint64_t elapsed_milliseconds() const
  93   {
  94     struct timespec temp;
  95     difference(temp);
  96
  97     return temp.tv_sec*1000 +temp.tv_nsec/1000000;
  98   }
  99
 100   void difference(struct timespec& arg) const
 101   {
 102     if ((_end.tv_nsec -_begin.tv_nsec) < 0)
 103     {
 104       arg.tv_sec= _end.tv_sec -_begin.tv_sec -1;
 105       arg.tv_nsec= 1000000000 +_end.tv_nsec -_begin.tv_nsec;
 106
 107     }
 108     else
 109     {
 110       arg.tv_sec= _end.tv_sec -_begin.tv_sec;
 111       arg.tv_nsec= _end.tv_nsec -_begin.tv_nsec;
 112     }
 113   }
 114
 115 private:
 116   void _time(struct timespec& ts)
 117   {
 118 #ifdef __MACH__ // OSX lacks clock_gettime()
 119     clock_serv_t _clock_serv;
 120     mach_timespec_t _mach_timespec;
 121     host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &_clock_serv);
 122     clock_get_time(_clock_serv, &_mach_timespec);
 123     mach_port_deallocate(mach_task_self(), _clock_serv);
 124     ts.tv_sec= _mach_timespec.tv_sec;
 125     ts.tv_nsec= _mach_timespec.tv_nsec;
 126 #elif defined(HAVE_CLOCK_GETTIME) && HAVE_CLOCK_GETTIME
 127     int ret;
 128     do
 129     {
 130       ret= clock_gettime(CLOCK_REALTIME, &ts);
 131     } while (ret == -1);
 132 #elif defined(HAVE_GETTIMEOFDAY) && HAVE_GETTIMEOFDAY
 133     struct timeval tv;
 134     int ret;
 135     do
 136     {
 137       ret= gettimeofday(&tv, NULL)
 138     } while (ret == -1);
 139     /* Convert from timeval to timespec */
 140     ts.tv_sec= tv.tv_sec;
 141     ts.tv_nsec= tv.tv_usec * 1000;
 142 #else
 143     memset(&ts, 0, sizeof(struct timespec));
 144 #endif
 145   }
 146
 147 private:
 148   struct timespec _begin;
 149   struct timespec _end;
 150 };
 151
 152 std::ostream& operator<<(std::ostream& output, const libtest::Timer& arg);
 153
 154 } // namespace libtest