[Python-Dev] Asking for reversion

Neil Schemenauer nas-python at arctrix.com
Tue Feb 5 14:41:14 EST 2019

I wrote:
> Could we somehow mark these APIs as experimental in 3.8?

It seems the change "e5ef45b8f519a9be9965590e1a0a587ff584c180" the
one we are discussing.  It adds two new files:


It doesn't introduce new C APIs.  So, only
multiprocessing.shared_memory seems public.  I see we have PEP 411
that should cover this case:


The setup.py code could be more defensive.  Maybe only build on
platforms that have supported word sizes etc?  For 3.8, could it be
activated by uncommenting a line in Modules/Setup, rather than by

What happens in shared_memory if the _posixshmem module is not
available?  On Windows it seems like an import error is raised.
Otherwise, _PosixSharedMemory becomes 'object'.  Does that mean the
API still works but you lose the zero-copy speed?



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