static GlobalData g;

void thread1()
{
    while(true) {
        if (g.ptr)
            g.ptr->method();
    }
}

void thread2()
{
   g.ptr = new Game();
   g.ptr->run();
   delete g.ptr;
}

void main()
{
   start_thread1();
   start_thread2();

   do_something_else();
}