title: How to use Fl::awake in the FLTK Library
body: <p>I would like to use the Fl::awake(callback) function to call functions from my main loop in an FLTK program. I am calling Fl::awake from a child thread, it returns 1 (success), but my function never gets called. I am calling Fl::wait() in a loop in the main thread. Is there any way i can troubleshoot this?</p>