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Hang when calling get() on an empty queue in the queue module #47388

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slash2314 mannequin opened this issue Jun 19, 2008 · 4 comments
Closed

Hang when calling get() on an empty queue in the queue module #47388

slash2314 mannequin opened this issue Jun 19, 2008 · 4 comments
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type-bug An unexpected behavior, bug, or error

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@slash2314
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Mannequin

slash2314 mannequin commented Jun 19, 2008

BPO 3138
Nosy @amauryfa, @benjaminp

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 = <Date 2008-06-19.12:49:02.621>
created_at = <Date 2008-06-19.08:08:16.445>
labels = ['type-bug', 'invalid']
title = 'Hang when calling get() on an empty queue in the queue module'
updated_at = <Date 2009-03-27.16:07:11.459>
user = 'https://bugs.python.org/slash2314'

bugs.python.org fields:

activity = <Date 2009-03-27.16:07:11.459>
actor = 'tazle'
assignee = 'none'
closed = True
closed_date = <Date 2008-06-19.12:49:02.621>
closer = 'benjamin.peterson'
components = []
creation = <Date 2008-06-19.08:08:16.445>
creator = 'slash2314'
dependencies = []
files = []
hgrepos = []
issue_num = 3138
keywords = []
message_count = 4.0
messages = ['68393', '68396', '68401', '84269']
nosy_count = 4.0
nosy_names = ['amaury.forgeotdarc', 'benjamin.peterson', 'slash2314', 'tazle']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue3138'
versions = ['Python 3.0']
@slash2314
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Mannequin Author

slash2314 mannequin commented Jun 19, 2008

This behavior appears in Python 3.0b1. If you use queue.Queue and call
the get method on the empty queue, it appears to hang. The same
behavior seems to be evident in the PriorityQueue too.

@slash2314 slash2314 mannequin added the type-bug An unexpected behavior, bug, or error label Jun 19, 2008
@amauryfa
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2.5 has the same behavior:

Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import Queue
>>> q = Queue.Queue()
>>> q.get()
.... block forever ...

Did you get different results?

@benjaminp
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It's intended that Queue.get blocks until something is put on the Queue.
If you don't want it to block use Queue.get(False).

@tazle
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Mannequin

tazle mannequin commented Mar 27, 2009

Is it also intended that Queue.get() eats SIGINTs, requiring one to kill
the process with something heavier?

@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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