| From: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
|---|---|
| To: | Ranier Vilela <ranier(dot)vf(at)gmail(dot)com> |
| Cc: | Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, David Rowley <dgrowleyml(at)gmail(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Avoid unecessary MemSet call (src/backend/utils/cache/relcache.c) |
| Date: | 2022-08-11 11:49:04 |
| Message-ID: | 20220811114904.ghrsekqhf5dsm6ys@alvherre.pgsql |
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| Lists: | pgsql-hackers |
On 2022-Aug-11, Ranier Vilela wrote:
> According to:
> https://interrupt.memfault.com/blog/c-struct-padding-initialization
Did you actually read it?
https://interrupt.memfault.com/blog/c-struct-padding-initialization#structure-zero-initialization
: This looks great! However, it’s not obvious (from looking at those snippets)
: what the value loaded into the padding region will be.
:
: The unfortunate answer is: it depends
:
: The C11 standard, chapter §6.2.6.1/6 says this:
:
: : When a value is stored in an object of structure or union type, including in a
: : member object, the bytes of the object representation that correspond to any
: : padding bytes take unspecified values.
--
Álvaro Herrera 48°01'N 7°57'E — https://www.EnterpriseDB.com/
"La rebeldía es la virtud original del hombre" (Arthur Schopenhauer)
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