#include "graph.h"

struct rusage ru;
struct timeval start_time, end_time, sample_time;

#ifndef OPUS
BeginTiming()
{
  getrusage(0,&ru);
  start_time = ru.ru_utime;
}

/* Return difference between start and ending time in hundredths of a
second.
*/
int EndTiming()
{
  int t;

  getrusage(0,&ru);
  end_time = ru.ru_utime;
  if (end_time.tv_usec < start_time.tv_usec){
    end_time.tv_usec += 1000000;
    end_time.tv_sec -= 1;
  }
  t = 100*(end_time.tv_sec - start_time.tv_sec) +
	(end_time.tv_usec - start_time.tv_usec) / 10000;
  return t;
}

/* Return difference between start and sample time in .001 seconds.
*/
int SampleTime()
{
  int t;

  getrusage(0,&ru);
  sample_time = ru.ru_utime;
  if (sample_time.tv_usec < start_time.tv_usec){
    sample_time.tv_usec += 1000000;
    sample_time.tv_sec -= 1;
  }
  t = 1000*(sample_time.tv_sec - start_time.tv_sec) +
	(sample_time.tv_usec - start_time.tv_usec) / 1000;
  return t;
}

#else

BeginTiming()
{
  utime = getusclk();
}

/* Return time in milliseconds.  The clock overflows once an hour.
*/
EndTiming()
{
  t1 = getusclk();
  if (t1 > utime)
    return (t1 - utime) / 1000;
  else
    return ((0xffffffff - utime) + t1) / 1000;
}

SampleTime()
{
  return EndTime();
}
#endif