[project @ Arch-1:robey@lag.net--2003-public%secsh--dev--1.0--patch-28]

fix lingering thread bug
this bug has been in there forever and i could never figure out a workaround
till now.

when the python interpreter exits, it doesn't necessarily destroy the
remaining objects or call __del__ on anything, and it will lock up until all
threads finish running.  how the threads are supposed to notice the exiting
interpreter has always been sort of a mystery to me.

tonight i figured out how to use the 'atexit' module to register a handler
that runs when the interpreter exits.  now we keep a list of active threads
and ask them all to exit on shutdown.  no more going to another shell to
kill -9 python!  yeah!!

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