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@ronaldoussoren
I updated the PR and we need some discussion.
I benchmarked new patch with Fibonacci codes.
baseline(master): 21.330535484 
without call sysctlbyname(PR 8046): 22.857963209 secs
with call sysctlbyname(PR 8046): 37.125129114 secs
So my choice is just believe pthread_get_stacksize_np() like rust do. (https://github.com/rust-lang/rust/blob/master/src/libstd/sys/unix/thread.rs#L246)
code:
def fib(n):
 if n == 0:
 return 0
 if n == 1:
 return 1
 return fib(n-2) + fib(n-1)
if __name__ == '__main__':
 import timeit
 print(timeit.timeit("fib(10)", setup="from __main__ import fib"))