Armin Rigo released https://pypi.org/project/cffi/1.12.2/ which is compatible with Python 3.8.0a2.

The issue was related to the PyInterpreterState change: https://bugs.python.org/issue35886#msg336501

Note: "[RELEASE] Python 3.8.0a1 is now available for testing" the correct version is 3.8.0a2 :-)

Victor

Le mar. 26 févr. 2019 à 14:02, Stephane Wirtel stephane@wirtel.be a écrit :

Hi Łukasz,

Thank you for your job.

I have created a Merge Request for the docker image of Barry [1].

I also filled an issue [2] for brotlipy (used by httpbin and requests). The problem is with PyInterpreterState.

Via Twitter, I have proposed to the community to fix the issue [2].

Thanks again for your job.

Cheers,

Stéphane

-- Stéphane Wirtel - https://wirtel.be - @matrixise _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/vstinner%40redhat.com

-- Night gathers, and now my watch begins. It shall not end until my death.

Hi,

Le ven. 1 mars 2019 à 02:12, Neil Schemenauer nas-python@arctrix.com a écrit :

I believe the correct fix is to use PEP 3121 per-interpreter module state. I created a new issue:

https://github.com/psycopg/psycopg2/issues/854

I think the fix is not trival as the psycopgmodule.c source code has change a fair bit to use the PEP 3121 APIs.

The problem is this function:

/* Return nonzero if the current one is the main interpreter */ static int psyco_is_main_interp(void) { static PyInterpreterState *main_interp = NULL; /* Cached reference */ PyInterpreterState *interp;

if (main_interp) { return (main_interp == PyThreadState_Get()->interp); }

/* No cached value: cache the proper value and try again. */ interp = PyInterpreterState_Head(); while (interp->next) interp = interp->next;

main_interp = interp; assert (main_interp); return psyco_is_main_interp(); }

https://github.com/psycopg/psycopg2/blob/599432552aae4941c2b282e9251330f1357...

I'm not sure that this code is safe. In CPython, iterating on interp->next is protected by a lock:

HEAD_LOCK(); ... HEAD_UNLOCK();

We already expose the main interpreter since Python 3.7: PyInterpreterState_Main(). psycopg can be modified to use directly this function rather than playing black magic with CPython internals.

IMHO it's a good thing that the compilation failed: that such bug is found :-)

Victor