> in an application of mine I have two threads:
> 1. The main GUI thread and
> 2. A worker thread
> The  worker thread is created with the boost thread library 
> and does its
> job in general pretty well.
> Now I need to listen for a keystroke in the worker thread. Up to now I
> was using the following function for this:
> bool key_pressed = fltk::get_key_state(m_keyForward); // 
> m_keyForward is


It may depend on your Xserver or indeed on which WM you are running
whether or not any thread other than the main() thread are permitted to
access the Xserver i/o.

In general, for maximum portability, you need to localise all your
graphics and i/o in the main() thread, and have the subsidiary threads
do other work...



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