Re: Avoid unecessary MemSet call (src/backend/utils/cache/relcache.c) - Mailing list pgsql-hackers

From Alvaro Herrera
Subject Re: Avoid unecessary MemSet call (src/backend/utils/cache/relcache.c)
Date
Msg-id 20220811114904.ghrsekqhf5dsm6ys@alvherre.pgsql
Whole thread Raw
In response to Re: Avoid unecessary MemSet call (src/backend/utils/cache/relcache.c)  (Ranier Vilela <ranier.vf@gmail.com>)
Responses Re: Avoid unecessary MemSet call (src/backend/utils/cache/relcache.c)
List 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)



pgsql-hackers by date:

Previous
From: Ranier Vilela
Date:
Subject: Re: Avoid unecessary MemSet call (src/backend/utils/cache/relcache.c)
Next
From: Ranier Vilela
Date:
Subject: Re: Avoid unecessary MemSet call (src/backend/utils/cache/relcache.c)