From: Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP>
Subject: Re: Forcing GNAT to use 32-bit load/store instructions on ARM?
Date: Tue, 8 Jul 2014 12:12:22 +0000 (UTC)
Date: 2014-07-08T12:12:22+00:00 [thread overview]
Message-ID: <lpgn76$u7h$1@dont-email.me> (raw)
In-Reply-To: lpf7hv$am9$1@loke.gir.dk
On 2014-07-07, Randy Brukardt <randy@rrsoftware.com> wrote:
>
> Clearly, we need a partial aggregate syntax (it's the only way for an atomic
> record write to make sense), and that needs to be clear that it includes
> both a read and a write of the object for the purposes of volatile
> variables. Probably someone should submit this problem to Ada-Comment for
> study in the next version of Ada (whenever that might be).
>
What are the submission details for Ada-Comment ? (Searching for Ada
Comments just points to links about using comments in Ada code.)
What is the level of formality and problem detail required in the
submission ?
I also wonder if "Atomic" is the correct word here; perhaps something
like "Non_Segmented_Access" would be a better attribute name when we
_must_ access the register in units of the record size and don't really
care about the Read-Modify-Write sequence itself being indivisible.
_We_ "know" that Atomic in this case really only means there's a single,
full-sized read and a single full-sized write of the register and that
the whole Read-Modify-Write sequence itself isn't really indivisible.
However, it's reasonable for a newcomer to Ada to wonder if Atomic
really does mean the whole Read-Modify-Write sequence itself is
indivisible.
One of the goals of Ada is to express clarity when writing code and
"Non_Segmented_Access" expresses the intent here better than Atomic
does.
Simon.
--
Simon Clubley, clubley@remove_me.eisner.decus.org-Earth.UFP
Microsoft: Bringing you 1980s technology to a 21st century world
next prev parent reply other threads:[~2014-07-08 12:12 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-30 22:11 Forcing GNAT to use 32-bit load/store instructions on ARM? daniel.dmk
2014-06-30 23:41 ` Jeffrey Carter
2014-07-01 12:06 ` Simon Clubley
2014-07-01 15:44 ` Niklas Holsti
2014-07-01 17:26 ` Simon Clubley
2014-07-01 17:18 ` Simon Wright
2014-07-01 19:43 ` Simon Wright
2014-07-01 17:28 ` Jeffrey Carter
2014-07-01 0:55 ` anon
2014-07-01 4:30 ` Niklas Holsti
2014-07-01 8:11 ` Dmitry A. Kazakov
2014-07-01 12:09 ` Simon Clubley
2014-07-01 12:20 ` Dmitry A. Kazakov
2014-07-01 17:00 ` Simon Clubley
2014-07-01 19:36 ` Dmitry A. Kazakov
2014-07-01 20:08 ` Simon Clubley
2014-07-02 22:24 ` Randy Brukardt
2014-07-06 20:40 ` MatthiasR
2014-07-07 0:25 ` Simon Clubley
2014-07-07 22:38 ` Randy Brukardt
2014-07-08 6:51 ` Simon Wright
2014-07-10 11:47 ` Simon Wright
2014-07-10 13:06 ` Simon Clubley
2014-07-11 18:05 ` Simon Wright
2014-07-11 20:22 ` Simon Clubley
2014-07-08 8:50 ` Brian Drummond
2014-07-08 12:12 ` Simon Clubley [this message]
2014-07-08 13:26 ` G.B.
2014-07-08 17:13 ` Simon Clubley
2014-07-08 15:36 ` Adam Beneschan
2014-07-08 15:40 ` Adam Beneschan
2014-07-08 20:34 ` Randy Brukardt
2014-07-09 7:31 ` Dmitry A. Kazakov
2014-07-10 0:11 ` Simon Clubley
2014-07-20 11:35 ` MatthiasR
2014-07-20 15:49 ` Simon Clubley
2014-07-26 11:05 ` MatthiasR
2014-08-10 11:20 ` MatthiasR
2014-07-01 12:03 ` Simon Clubley
2014-07-01 19:52 ` daniel.dmk
2014-07-01 20:40 ` Simon Clubley
2014-07-01 20:55 ` Simon Clubley
2014-07-01 21:01 ` Niklas Holsti
2014-07-01 21:20 ` Simon Clubley
2014-07-01 22:38 ` Niklas Holsti
2014-07-02 16:49 ` Simon Clubley
2014-07-01 21:55 ` daniel.dmk
2014-07-02 7:30 ` Simon Wright
2014-07-02 18:52 ` daniel.dmk
2014-07-04 23:51 ` Niklas Holsti
2014-07-05 0:18 ` Niklas Holsti
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox