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Add a function to know about interpreter shutdown #66885

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pitrou opened this issue Oct 22, 2014 · 16 comments
Closed

Add a function to know about interpreter shutdown #66885

pitrou opened this issue Oct 22, 2014 · 16 comments
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interpreter-core (Objects, Python, Grammar, and Parser dirs) type-feature A feature request or enhancement

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@pitrou
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pitrou commented Oct 22, 2014

BPO 22696
Nosy @pitrou, @vstinner, @serhiy-storchaka
Files
  • is_finalizing.patch
  • traceback_ignore_linecache_error.patch
  • is_finalizing2.patch
    		•

    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 2014-12-07.00:30:35.648>
created_at = <Date 2014-10-22.12:20:53.014>
labels = ['interpreter-core', 'type-feature']
title = 'Add a function to know about interpreter shutdown'
updated_at = <Date 2015-01-06.00:34:40.838>
user = 'https://github.com/pitrou'

    bugs.python.org fields:

    activity = <Date 2015-01-06.00:34:40.838>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2014-12-07.00:30:35.648>
closer = 'pitrou'
components = ['Interpreter Core']
creation = <Date 2014-10-22.12:20:53.014>
creator = 'pitrou'
dependencies = []
files = ['36992', '37365', '37369']
hgrepos = []
issue_num = 22696
keywords = ['patch']
message_count = 16.0
messages = ['229817', '229818', '229820', '229823', '229824', '231248', '231364', '232178', '232186', '232200', '232210', '232212', '232218', '232261', '232262', '233494']
nosy_count = 5.0
nosy_names = ['pitrou', 'vstinner', 'Arfrever', 'python-dev', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue22696'
versions = ['Python 3.5']
    @pitrou
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    pitrou commented Oct 22, 2014

    I propose to add a new function sys.shutting_down() (name debatable) returning True if the interpreter is currently shutting down.

    This would be a function so that you can bind it and avoid having it wiped at shutdown :-)

    @pitrou pitrou added interpreter-core (Objects, Python, Grammar, and Parser dirs) type-feature A feature request or enhancement labels Oct 22, 2014
    @vstinner
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    For the issue bpo-22599, I wrote a patch but then I removed my patch and reverted my changed...

    Here is a new patch which implements why I already wrote: add a new sys._is_finalizing() function, with a unit test.

    I propose to add a new function sys.shutting_down() (name debatable)

    The name sounds like a function to shut down the computer or exit Python.

    I don't like _is_finalizing() name neither :-)

    My patch uses a private function which is CPython specific. Does it make sense to add a public function instead? Is it possible to implement it in any Python implementation (PyPy, IronPython, Jython, etC.)? I guess that the most dummy implementation is to always return False (Python is always running.

    @serhiy-storchaka
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    Are there other special interpreter states about which it would by helpful to
    know? Interpreter initializing, garbage collecting, signal handling?

    @pitrou
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    pitrou commented Oct 22, 2014

    My patch uses a private function which is CPython specific.
    Does it make sense to add a public function instead?

    I would like it to be public. It can be useful in __del__ methods and the like.

    @pitrou
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    pitrou commented Oct 22, 2014

    Are there other special interpreter states about which it would by
    helpful to know? Interpreter initializing, garbage collecting, signal
    handling?

    • interpreter initializing: user code generally isn't executed in that phase
    • garbage collecting: there are already garbage collection callbacks
    • signal handling: well... I don't see why that would be useful

    @serhiy-storchaka
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    I'm +0 for is_finalizing.

    There is a typo in the docstring.

    @serhiy-storchaka
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    An indirect way how to know about interpreter shutdown -- test existing of the path attribute in sys (bpo-20603).

    @serhiy-storchaka
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    After solving this issue we should reconsider the traceback_ignore_linecache_error.patch patch in bpo-22599.

    @vstinner
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    vstinner commented Dec 5, 2014

    After solving this issue we should reconsider the traceback_ignore_linecache_error.patch patch in bpo-22599.

    I reposted the patch in this issue since I just closed the issue bpo-22599.

    @pitrou
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    pitrou commented Dec 5, 2014

    Here is a patch with docs.

    @vstinner
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    vstinner commented Dec 5, 2014

    is_finalizing2.patch looks good to me.

    @serhiy-storchaka
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    Before committing the patch it will be good to find places in the code which will benefit from this function.

    And please don't forget to fix a typo in the docstring.

    @vstinner
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    vstinner commented Dec 5, 2014

    Before committing the patch it will be good to find places in the code which will benefit from this function.

    The traceback and/or the linecache is a first good candidate to use this new function. We may patch more functions later if needed, I don't think that we need to address all issues right now.

    @python-dev
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    python-dev mannequin commented Dec 7, 2014

    New changeset 7f3695701724 by Antoine Pitrou in branch 'default':
    Issue bpo-22696: Add function :func:`sys.is_finalizing` to know about interpreter shutdown.
    https://hg.python.org/cpython/rev/7f3695701724

    @pitrou
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    pitrou commented Dec 7, 2014

    Using the function in the stdlib can be done separately. I fixed the typo in the docstring. Thanks!

    @pitrou pitrou closed this as completed Dec 7, 2014
    @vstinner
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    vstinner commented Jan 6, 2015

    Using the function in the stdlib can be done separately.

    Is there an open issue for that?

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