python bindings memory management

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Gaute Hope Gaute Hope
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python bindings memory management

Hi,

when writing this small script [0][1] using the notmuch python bindings I
had to manually delete the python objects in the right order. Otherwise
it segfaults when exiting, presumably because memory dependencies /
cleanup isn't done correctly when the Python GC gets going. Essentially
I have to delete the objects in the order of their dependency:

```
  db = notmuch.Database()
  q = db.create_query ("some query")
  q.set_sort (notmuch.Query.SORT.OLDEST_FIRST) # probably not necessary
  msgs = q.search_messages ()


  for m in msgs:
    pass

  # remove these to get segfault
  del m
  del msgs
  del q

```

Regards, Gaute

[0] https://gist.github.com/gauteh/de546cb143ebae4a489a482a05ab4beb
[1] id:[hidden email]

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David Bremner-2 David Bremner-2
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Re: python bindings memory management

Gaute Hope <[hidden email]> writes:

> Hi,
>
> when writing this small script [0][1] using the notmuch python bindings I
> had to manually delete the python objects in the right order. Otherwise
> it segfaults when exiting, presumably because memory dependencies /
> cleanup isn't done correctly when the Python GC gets going. Essentially
> I have to delete the objects in the order of their dependency:

Assuming this is python > 3.3, it sounds related to

     id:[hidden email]

See in particular

    id:[hidden email]
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Gaute Hope Gaute Hope
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Re: python bindings memory management

David Bremner writes on november 20, 2017 0:11:

> Gaute Hope <[hidden email]> writes:
>
>> Hi,
>>
>> when writing this small script [0][1] using the notmuch python bindings I
>> had to manually delete the python objects in the right order. Otherwise
>> it segfaults when exiting, presumably because memory dependencies /
>> cleanup isn't done correctly when the Python GC gets going. Essentially
>> I have to delete the objects in the order of their dependency:
>
> Assuming this is python > 3.3, it sounds related to
>
>      id:[hidden email]
>
> See in particular
>
>     id:[hidden email]

Yep, probably the same thing.

- Gaute

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