[Python-Dev] Re: Does anyone use threading debug PYTHONTHREADDEBUG=1 env var? Can I remove it?

Ok, thanks. I created https://bugs.python.org/issue44584 to deprecate the feature and schedule its removal in Python 3.12. Victor On Wed, Jul 7, 2021 at 8:09 PM Guido van Rossum wrote:

I agree, that flag was probably last useful when we were debugging the threading machinery itself. (Evidenced by it only working on --with-pydebug, which is for when you're debugging CPython itself, not any user apps.)

On Wed, Jul 7, 2021 at 9:33 AM Gregory P. Smith wrote:

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On Wed, Jul 7, 2021 at 2:28 AM Victor Stinner wrote:

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Hi,

Does anyone use threading debug PYTHONTHREADDEBUG=1 env var on a Python debug build? If not, can I just remove it?

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To fix a race condition at thread exit on Linux using the glibc, I removed calls to pthread_exit() (PyThread_exit_thread()) in the _thread module:

https://bugs.python.org/issue44434

A side effect of this change is the removal of the "PyThread_exit_thread called" threading debug log when using PYTHONTHREADDEBUG=1 environment variable.

I never used PYTHONTHREADDEBUG. I just tried it and it produces tons of output in stdout about locks. It looks basically useless because it produces way too many logs, and it pollutes stdout (ex: most Python tests fail when it's enabled).

This debug mode requires to build Python in debug mode (./configure --with-pydebug):

https://docs.python.org/dev/using/configure.html#python-debug-build

IMO there are enough external debugging tools to debug threading issues. Python no longer has to come with its built-in logs.

I propose to deprecate the feature in Python 3.11 and remove it in 2 releases (Python 3.13).

I agree with its removal.

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Victor -- Night gathers, and now my watch begins. It shall not end until my death. _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-leave@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/NMLGCDRU... Code of Conduct: http://python.org/psf/codeofconduct/

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-- --Guido van Rossum (python.org/~guido) Pronouns: he/him (why is my pronoun here?)

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