-rw-r--r-- 626 djbsort-20190516/cpucycles/monotoniccpuinfo/cpucycles.c
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include "osfreq.c"
#include "cpucycles.h"
static double cpufrequency = 0;
static void init(void)
{
cpufrequency = osfreq();
}
long long cpucycles(void)
{
double result;
struct timespec t;
if (!cpufrequency) init();
clock_gettime(CLOCK_MONOTONIC,&t);
result = t.tv_nsec;
result *= 0.000000001;
result += (double) t.tv_sec;
result *= cpufrequency;
return result;
}
long long cpucycles_persecond(void)
{
if (!cpufrequency) init();
return cpufrequency;
}