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

int main (int argc, char **argv)
{
    if (argc < 2)
        return 0;
    int loop = atoi(argv[1]);
    printf("loop %d.\n", loop);
    
    clock_t clock1, clock2, diff;
    clock1 = clock();

    int cnt=0;
	struct timeval tv;
    while (cnt++ < loop)
    {
	    gettimeofday(&tv, NULL);
    }

    clock2 = clock();
    diff = clock2 - clock1;
    printf("loop %d, diff %d.\n", loop, diff);
    printf("total time %.3f milliseconds.\n", ((float)diff/CLOCKS_PER_SEC)*1000);

	printf("tv_sec:%d\n", tv.tv_sec);
	printf("tv_usec:%d\n", tv.tv_usec);
	return 0;
}