in old glut, the main loop was the core of the single threaded program. exiting 
it did mean to exit the program completely.
in freeglut, you have alternatives. but for compatibility, it defaults to the 
old behaviour.

<http://haskell.org/ghc/docs/latest/html/libraries/GLUT/Graphics-UI-GLUT-Begin.html#v%3AExit>

- marc


Am Dienstag, 31. Juli 2007 19:16 schrieb Dave Tapley:
> Hi everyone, I have the following skeleton GLUT code:
> 
> > import Graphics.UI.GLUT
> > main = do
> >     getArgsAndInitialize
> >     createWindow ""
> >     mainLoop
> 
> It loads into both hugs and ghci fine and when 'main' is evaluated an
> empty window opens as expected.
> However when closing the window (clicking the window manager's x
> button) both hugs and ghci exit with the window, as opposed to
> returning to the the 'Main>' prompt.
> 
> I suspect I need some callback to exit the GUI cleanly?
> 
> Cheers,
> Dave
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> 

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