public abstract class Mutex {

	public static void criticalSection() {
		try {
			Thread.sleep((int) (Math.random() * 3000));
		}
		catch (InterruptedException e) {
			// Nothing
		}
	}

	public static void nonCriticalSection() {
		try {
			Thread.sleep((int) (Math.random() * 3000));
		}
		catch (InterruptedException e) {
			// Nothing
		}
	}

	// Take ownership
	public abstract void p(int id);

	// Release ownership
	public abstract void v(int id);
}