[vlc-devel] [PATCH v2 01/10] core: add atomic refcounter helper

Rémi Denis-Courmont remi at remlab.net
Mon Jul 2 17:25:57 CEST 2018


1) This creates obvious overflow. Exactly the bug that the inspiring kernel code is meant to fix...

2) So this won't work for e.g. picture_t.

3, 4) Inspiring kernel code does address those issues.

And then, no assert in public headers.

Le 2 juillet 2018 18:18:27 GMT+03:00, "Hugo Beauzée-Luyssen" <hugo at beauzee.fr> a écrit :
>On Mon, Jul 2, 2018, at 8:12 AM, Rémi Denis-Courmont wrote:
>> Same problems as before.
>> -- 
>> Envoyé de mon appareil Android avec Courriel K-9 Mail. Veuillez
>excuser 
>> ma brièveté.
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>> - type sizes (uint, uintptr...),
>
>The serie only affect code that was using uint, except for patch 4 that
>was using uintptr, and I believe uint to be a better fit; and patch 10.
>I'm fine with dropping patch 10 for now.
>
>> - order on decrement - acq_rel is not always needed,
>
>I believe it is.
>
>> - corner cases where the decrement is known to not reach zero,
>
>Then don't use the helper in that case?
>
>> - corner cases where the decrement cannot be permitted to reach
>zero(e.g. vlc_object_t, IIRC).
>
>Ditto.
>
>-- 
>  Hugo Beauzée-Luyssen
>  hugo at beauzee.fr
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