how to display "busy" cursor ? and another question

[Han <keepsimple gmail com>]

Hi,

I have a couple of questions when learning to program GTK+ :

1) How can I display a "busy" cursor to users ?  The reason is that I
need to perform a task and cannot response to users for a few seconds.

2) Is GTK+ window main loop (gtk_main) multi-threaded ?  If not,  is
there a recommended way to implement multi-threading in GTK+ ?

thanks
Han