[Python-Dev] stack check on Unix: any suggestions?

[Jack Jansen]

I'm confused now: how is this counting-stack-limit different from the maximum 
recursion depth we already have?

The whole point of PyOS_StackCheck is to do an _actual_ check of whether 
there's space left for the stack so we can hopefully have an orderly cleanup 
before we hit the hard limit.

If computing it is too difficult because getrlimit isn't available or doesn't 
do what we want we should probe it, as the windows code does or my example 
code posted yesterday does. Note that the testing only has to be done every 
*first* time the stack goes past a certain boundary: the probing can remember 
the deepest currently known valid stack location, and everything that is 
shallower is okay from that point on (making PyOS_StackCheck a subroutine call 
and a compare in the normal case).
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