#include <stdio.h>
#include <sys/time.h>
#include <time.h>

int gettimeofday(struct timeval *tv, struct timezone *tz);

int main(int argc,char * argv[]){

struct timeval t_start,t_end;

long cost_time = 0;

//get start time
gettimeofday(&t_start, NULL);
long start = ((long)t_start.tv_sec)*1000+(long)t_start.tv_usec/1000;
printf("Start time: %ld ms\n", start);

sleep(2);

//get end time
gettimeofday(&t_end, NULL);
long end = ((long)t_end.tv_sec)*1000+(long)t_end.tv_usec/1000;
printf("End time: %ld ms\n", end);

//calculate time slot
cost_time = end - start;
printf("Cost time: %ld ms\n", cost_time);

return 0;

}