dev/vala/live.gnome.org_tutorial/main_loop.vala

void main() {

    var loop = new MainLoop();
    var time = new TimeoutSource(2000);

    time.set_callback(() => {
        stdout.printf("Time!\n");
        loop.quit();
        return false;
    });

    time.attach(loop.get_context());

    stdout.puts ("Call MainLoop.run ():\n");

    loop.run(); // blocking method

    stdout.puts ("End of main().\n");
}