Triggering a callback/event from another thread

[Dan Cotter <dancotter2003 hotmail com>]

Hi
 
I have a main thread that runs all my gtk stuff, and a second thread that does processing.
 
> From the second thread, how can I cause an event/signal to make a callback function execute in the gtk 
> thread?
For example I have a callback function to update a progress bar. How can I cause it to execute from my other 
thread?
 
I am using gtk+ with mingw on windows xp.
 
Thanks
 
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