timer.c

最大流

/* timing function: difference between two calls is processor time
 * spent by your code (in seconds) 
 * hopefully portable, but surely there are systems it doesn't work on.
 * $Id: timer.c,v 1.2 1996/11/15 22:30:24 mslevine Exp $ 
 */

#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>

#include "timer.h"

float timer ()
{
  struct rusage r;

  getrusage(0, &r);
  return (float)(r.ru_utime.tv_sec+r.ru_utime.tv_usec/(float)1000000);
}