rand() warmup

void init_random() {
    clock_t start = clock();
    int i = 0;
    while (clock() - start == 0) {
        i++;
    }
    srand(time(0) + i);
}

17±3 ms
Is it okay?

Why not just do something like this:

#include <stdlib.h>
#include <sys/timeb.h>
void init_random(void)
{
    struct timeb tp;
    ftime(&tp);
    srand(tp.time<<sizeof(short)*8 | tp.millitm);
}