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 <g...@krypto.org> wrote:

>
>
> On Wed, Jul 7, 2021 at 2:28 AM Victor Stinner <vstin...@python.org> wrote:
>
>> Hi,
>>
>> Does anyone use threading debug PYTHONTHREADDEBUG=1 env var on a
>> Python debug build? If not, can I just remove it?
>>
>> --
>>
>> 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.
>
>
>> Victor
>> --
>> Night gathers, and now my watch begins. It shall not end until my death.
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-- 
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*Pronouns: he/him **(why is my pronoun here?)*
<http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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