Terrifying fixed-rate game loop

//Fixed-rate logic ticks, that can be faster than the actual framerate.
//Horrifying in its implications. Works great until whatever's in the While loop
//takes longer than dt...

final float TARGET_RATE = 120.0f;

float accumulator = 0;
float period = 1.0f / TARGET_RATE;

//Draw() is called in a loop, dt is the time elapsed since the last call
public void draw(float dt) {
    accumulator += dt;
    while (accumulator > period) {
        accumulator -= period;

        //Do do stuff at 120Hz, irrespective of framerate
        //Just remember to use period anywhere you would normally use dt
    }

    //Do the rest of your logic at the game's actual framerate
}