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

[Jack Jansen]

My SGI has getrlimit(RLIMIT_STACK) which should do the trick. But maybe this 
is an sgi-ism? Otherwise RLIMIT_VMEM and subtracting brk() may do the trick.

While thinking about this, though, I suddenly realised that my (new, faster) 
Mac implementation of PyOS_CheckStack will fail miserably in any other than 
the main thread, something I'll have to fix shortly.

Unix code will also have to differentiate between running on the main stack 
and a sub-thread stack, probably. And I haven't looked at the way 
PyOS_CheckStack is implemented on Windows, but it may well also share this 
problem.
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