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devel / comp.std.c / Making the creation of atomic_flag optional

SubjectAuthor
* Making the creation of atomic_flag optionalPhilipp Klaus Krause
`* Re: Making the creation of atomic_flag optionalDavid Brown
 `- Re: Making the creation of atomic_flag optionalPhilipp Klaus Krause

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Making the creation of atomic_flag optional

<upifhv$19809$1@solani.org>

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From: pkk...@spth.de (Philipp Klaus Krause)
Newsgroups: comp.std.c
Subject: Making the creation of atomic_flag optional
Date: Fri, 2 Feb 2024 11:18:39 +0100
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 by: Philipp Klaus Krause - Fri, 2 Feb 2024 10:18 UTC

Currently, atomics are an all-or-nothing choice (via __SDTC_NO_ATOMICS__).

I'd like to see a third option: support atomics, except for the creation
of atomic_flag from allocated storage (or raw character arrays). This
would make it feasible to implement atomics for some low-end systems,
that otherwise can't support them efficiently.

Your opinions on the proposal and the proposed wording are welcome:
http://www.colecovision.eu/stuff/proposal-atomic_flag.html

Philipp

Re: Making the creation of atomic_flag optional

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From: david.br...@hesbynett.no (David Brown)
Newsgroups: comp.std.c
Subject: Re: Making the creation of atomic_flag optional
Date: Sat, 3 Feb 2024 12:09:22 +0100
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In-Reply-To: <upifhv$19809$1@solani.org>
 by: David Brown - Sat, 3 Feb 2024 11:09 UTC

On 02/02/2024 11:18, Philipp Klaus Krause wrote:
> Currently, atomics are an all-or-nothing choice (via __SDTC_NO_ATOMICS__).
>
> I'd like to see a third option: support atomics, except for the creation
> of atomic_flag from allocated storage (or raw character arrays). This
> would make it feasible to implement atomics for some low-end systems,
> that otherwise can't support them efficiently.
>
> Your opinions on the proposal and the proposed wording are welcome:
> http://www.colecovision.eu/stuff/proposal-atomic_flag.html
>
> Philipp

I think it is fine to implement parts of the atomics - you just can't
define the __SDTC_NO_ATOMICS__ symbol unless you cover it all.

Re: Making the creation of atomic_flag optional

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From: pkk...@spth.de (Philipp Klaus Krause)
Newsgroups: comp.std.c
Subject: Re: Making the creation of atomic_flag optional
Date: Thu, 8 Feb 2024 08:44:36 +0100
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In-Reply-To: <upl6t2$33jod$1@dont-email.me>
 by: Philipp Klaus Krause - Thu, 8 Feb 2024 07:44 UTC

Am 03.02.24 um 12:09 schrieb David Brown:
>
> I think it is fine to implement parts of the atomics - you just can't
> define the __SDTC_NO_ATOMICS__ symbol unless you cover it all.

The problem here is that there are architectures, where atomics could be
implemented except for one small issue - you can't use a char array (or
allocated memory) as an atomic_flag. IMO, it would be good if this
situation could be reflected in the standard.

Philipp

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