Python threading.Event().wait() depends on the system time · Issue #91394

Python threading.Event().wait() depends on the system time · Issue #91394 · python/cpython

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AleksandrAQ mannequin opened this issue

Apr 6, 2022

· 1 comment

Labels

3.8 stdlib

Python modules in the Lib dir

type-bug

An unexpected behavior, bug, or error

Comments

BPO	47238
Nosy	@AleksandrAQ
Files	reproduction.py: You need root privileges to change the system time.

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2022-04-06.10:19:09.231>
labels = ['3.8', 'type-bug', 'library']
title = 'Python threading.Event().wait() depends on the system time'
updated_at = <Date 2022-04-06.10:19:09.231>
user = 'https://github.com/AleksandrAQ'

bugs.python.org fields:

activity = <Date 2022-04-06.10:19:09.231>
actor = 'AleksandrAQ'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2022-04-06.10:19:09.231>
creator = 'AleksandrAQ'
dependencies = []
files = ['50725']
hgrepos = []
issue_num = 47238
keywords = []
message_count = 1.0
messages = ['416851']
nosy_count = 1.0
nosy_names = ['AleksandrAQ']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue47238'
versions = ['Python 3.8']

This happens on Ubuntu on Python versions 3.8.5 and 3.10.4

I have two threads that can change the system time to a day ago.
If the change in the system time for a day occurs at the time of wait, then I hang for one day plus the waiting time.

I thought Event.wait() uses a monotonous clock, but this behavior points to an absolute clock.

Are there any solutions?