Ronald Oussoren <ronaldousso...@mac.com> added the comment:

I've done some more testing, and the thread stack size could be smaller than 
16MB, but definitely not as small as the value that's currently in 
thread_pthread.h.

I prefer to have a slightly too large value here because IIRC the relation 
between the recursion limit and C stack usage is a heuristic. 

BTW. It should be possible to implement PyOS_CheckStack() on macOS. There are 
(undocumented) APIs in the public header files to get the stack base and size 
for the current thread. These APIs also work for the main thread:

# ---

#include <pthread.h>
#include <stdio.h>

int main(void)
{
        printf("%#lx\n", (long)pthread_get_stacksize_np(pthread_self()));
        printf("%p\n", pthread_get_stackaddr_np(pthread_self()));
}

# ---

----------

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue18049>
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