Two questions about atexit cleanup in dynamic modules

Two questions about atexit cleanup in dynamic modules

[Joris Vankerschaver]

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Hi all,

I wrote a small Emacs dynamic module to execute Python scripts in an
embedded
Python interpreter (https://github.com/jvkersch/emacs-python). The main
thing
missing is that I would like to do some cleanup in the embedded Python
interpreter when Emacs exits (close open files, deal with threads/processes,
etc). What would be the best way to do so?

1. Can I just register an atexit handler when my module starts, or will that
interfere with some Emacs internals?

2. Would it make sense to add support to the module API for a cleanup
callback
that is called when Emacs exits?

With best wishes,
Joris

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Re: Two questions about atexit cleanup in dynamic modules

[Philipp Stephani]

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Joris Vankerschaver <joris.vankerschaver@gmail.com> schrieb am Fr., 7. Apr.
2017 um 10:52 Uhr:

> Hi all,
>
> I wrote a small Emacs dynamic module to execute Python scripts in an
> embedded
> Python interpreter (https://github.com/jvkersch/emacs-python). The main
> thing
> missing is that I would like to do some cleanup in the embedded Python
> interpreter when Emacs exits (close open files, deal with
> threads/processes,
> etc). What would be the best way to do so?
>
> 1. Can I just register an atexit handler when my module starts, or will
> that
> interfere with some Emacs internals?
>

Unless you attempt to call Emacs functions in the atexit handler, that
should be fine.


>
> 2. Would it make sense to add support to the module API for a cleanup
> callback
> that is called when Emacs exits?
>

You can already use the hook `kill-emacs-hook' as usual. That's especially
useful if your cleanup needs to interact with Emacs.

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Re: Two questions about atexit cleanup in dynamic modules

[Joris Vankerschaver]

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Dear Philipp,

Many thanks for the confirmation regarding atexit, and for pointing out the
kill-emacs-hook. This is exactly what I needed!

With best wishes,
Joris

On Sat, Apr 8, 2017 at 5:38 PM, Philipp Stephani <p.stephani2@gmail.com>
wrote:

>
>
> Joris Vankerschaver <joris.vankerschaver@gmail.com> schrieb am Fr., 7.
> Apr. 2017 um 10:52 Uhr:
>
>> Hi all,
>>
>> I wrote a small Emacs dynamic module to execute Python scripts in an
>> embedded
>> Python interpreter (https://github.com/jvkersch/emacs-python). The main
>> thing
>> missing is that I would like to do some cleanup in the embedded Python
>> interpreter when Emacs exits (close open files, deal with
>> threads/processes,
>> etc). What would be the best way to do so?
>>
>> 1. Can I just register an atexit handler when my module starts, or will
>> that
>> interfere with some Emacs internals?
>>
>
> Unless you attempt to call Emacs functions in the atexit handler, that
> should be fine.
>
>
>>
>> 2. Would it make sense to add support to the module API for a cleanup
>> callback
>> that is called when Emacs exits?
>>
>
> You can already use the hook `kill-emacs-hook' as usual. That's especially
> useful if your cleanup needs to interact with Emacs.
>

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