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?

>>13
While using real-world data in your randomness is great, if it's entirely from things that the user can very potentially influence, you might have issues with users being able to 'control' your randomness. Albeit that's a bit of a far stretch, depending on what sensory input you use and how you use it.