Description

assignee = None
closed_at = None
created_at = <Date 2020-06-21.08:53:48.034>
labels = ['expert-C-API', 'type-feature', '3.11']
title = 'Advanced Debugger Support C-API is useless without HEAD_LOCK()/HEAD_UNLOCK()'
updated_at = <Date 2021-12-06.18:25:56.506>
user = 'https://github.com/AndreiPashkin'

activity = <Date 2021-12-06.18:25:56.506>
actor = 'iritkatriel'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['C API']
creation = <Date 2020-06-21.08:53:48.034>
creator = 'pashkin'
dependencies = []
files = []
hgrepos = []
issue_num = 41062
keywords = []
message_count = 2.0
messages = ['371988', '371989']
nosy_count = 2.0
nosy_names = ['vstinner', 'pashkin']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue41062'
versions = ['Python 3.11']

Activity

1. AndreiPashkin commented on Jun 21, 2020

   

   AndreiPashkinmannequin

   on Jun 21, 2020

   MannequinAuthor

   More actions

   To me it seems like Advanced Debugger Support C-API doesn't make sense without HEAD_LOCK() and HEAD_UNLOCK() which are private right now.

   When researching how C-API works I've found this comment in the source code:
   

   cpython/Python/pystate.c

   Line 1176 in e838a93

   * Because these lists can mutate even when the GIL is held, we

   It says that the lists of interpreter-state and thread-state objects (that Adv. Debugger Support API operates on) could be mutated even when GIL is held so there is need to acquire head mutex when accessing them. But there is no way to acquire head mutex using public C-API.

   Am I right? If yes - it seems like HEAD_(UN)LOCK() should be made public.
2. AndreiPashkin

   added

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   3.7 (EOL)end of lifeend of life

   3.8 (EOL)end of lifeend of life

   3.9 (EOL)end of lifeend of life

   3.10 (EOL)end of lifeend of life

   topic-C-API

   on Jun 21, 2020
3. AndreiPashkin commented on Jun 21, 2020

   

   AndreiPashkinmannequin

   on Jun 21, 2020

   MannequinAuthor

   More actions

   Here is what I mean by "Advanced Debugger Support" API:
   https://docs.python.org/dev/c-api/init.html#advanced-debugger-support
4. iritkatriel

   added

   3.11only security fixesonly security fixes

   type-featureA feature request or enhancementA feature request or enhancement

   and removed

   3.7 (EOL)end of lifeend of life

   3.8 (EOL)end of lifeend of life

   3.9 (EOL)end of lifeend of life

   3.10 (EOL)end of lifeend of life

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   on Dec 6, 2021
5. ezio-melotti

   transferred this issue fromon Apr 10, 2022

Issue actions