Re: Why not use the calloc to replace malloc?

From: Thorsten Glaser <tg(at)evolvis(dot)org>
To: pgsql-general(at)lists(dot)postgresql(dot)org
Cc: Wen Yi <chuxuec(at)outlook(dot)com>
Subject: Re: Why not use the calloc to replace malloc?
Date: 2023-04-23 14:21:48
Message-ID: 41c9d7f-7953-d22c-12f1-e83815cb5d9e@evolvis.org
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-general

On Sat, 22 Apr 2023, Tom Lane wrote:

>Wen Yi <chuxuec(at)outlook(dot)com> writes:
>> [ use calloc to replace zeroing fields individually ]
[…]
>People have complained about this practice off-and-on, but no one has
>provided any evidence that there's a significant performance cost.
>The maintenance benefits are real though.

Oh, interesting ;-) Thanks for this explanation.

Another data point is: calloc is not correct for pointer fields,
you have to manually assign NULL to them afterwards still, because
NULL doesn’t have to be represented by all-zero bytes (e.g. TenDRA
supports having 0x55555555 as NULL pointer as an option).

bye,
//mirabilos
--
15:41⎜<Lo-lan-do:#fusionforge> Somebody write a testsuite for helloworld :-)

In response to

Responses

Browse pgsql-general by date

  From Date Subject
Next Message Tom Lane 2023-04-23 15:04:21 Re: Why not use the calloc to replace malloc?
Previous Message Tom Lane 2023-04-23 03:59:37 Re: Why not use the calloc to replace malloc?