my ... understanding of event loops

It isn't SDL, it's Tk; but see Anatomy of an Eventloop. It may give you an idea of what is going on in SDL.

P.S. I tried to run your code, but couldn't find what "use btype" is, or "ship.pm". Your code is indeed a batch of spaghetti. :-)

I'm not really a human, but I play one on earth.
Old Perl Programmer Haiku ................... flash japh

In reply to Re^5: SDLx::App event loop by zentara
in thread SDLx::App event loop by Ransom

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