Re: Avoid use deprecated Windows Memory API

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От Ranier Vilela
Тема Re: Avoid use deprecated Windows Memory API
Дата
Msg-id CAEudQApfcgDr21yGNPRU_kSSQ9xYcTxPCqVYWepVaZ7tM7jKqw@mail.gmail.com
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Ответ на Re: Avoid use deprecated Windows Memory API  (Daniel Gustafsson <daniel@yesql.se>)
Ответы Re: Avoid use deprecated Windows Memory API  (Aleksander Alekseev <aleksander@timescale.com>)
Список pgsql-hackers
Em qui., 15 de set. de 2022 às 10:30, Daniel Gustafsson <daniel@yesql.se> escreveu:
> On 15 Sep 2022, at 15:13, Alvaro Herrera <alvherre@alvh.no-ip.org> wrote:
>
> On 2022-Sep-15, Ranier Vilela wrote:
>
>> Em qui., 15 de set. de 2022 às 09:50, Alvaro Herrera <
>> alvherre@alvh.no-ip.org> escreveu:
>
>>> These functions you are patching are not in performance-sensitive code,
>>> so I doubt this makes any difference performance wise.  I doubt
>>> Microsoft will ever remove these deprecated functions, given its history
>>> of backwards compatibility, so from that perspective this change does
>>> not achieve anything either.
>>
>> If users don't adapt to the new API, the old one will never really expire.
>
> If you are claiming that Microsoft will remove the old API because
> Postgres stopped using it, ... sorry, no.

Also, worth noting is that these functions aren't actually deprecated.  The
note in the docs state:
Daniel, I agree that MSDN could be better written.
See:

"Remarks

Windows memory management does not provide a separate local heap and global heap. Therefore, the LocalAlloc and GlobalAlloc functions are essentially the same.

The movable-memory flags LHND, LMEM_MOVABLE, and NONZEROLHND add unnecessary overhead and require locking to be used safely. They should be avoided unless documentation specifically states that they should be used.

New applications should use the heap functions"

 
Again, MSDN claims to use a new API.

And following the bouncing ball into the documentation they refer to [0] I read
this:

        As a result, the global and local families of functions are equivalent
        and choosing between them is a matter of personal preference.
IMO,  This part has nothing to do with it.

regards,
Ranier Vilela

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