From: "Randy Brukardt" <randy@rrsoftware.com>
Subject: Re: Barrier re-evaluation issue with GNAT 4.3.2
Date: Sat, 10 Oct 2009 00:41:38 -0500
Date: 2009-10-10T00:41:38-05:00 [thread overview]
Message-ID: <hap6tm$cmk$1@munin.nbi.dk> (raw)
In-Reply-To: h9rco8$u58$1@news.tornevall.net
"Jeffrey R. Carter" <spam.jrcarter.not@spam.acm.org> wrote in message
news:h9rco8$u58$1@news.tornevall.net...
> Robert A Duff wrote:
>>
>> Pragma Detect_Blocking will cause GNAT to raise Program_Error.
>> If you want to write portable code, you should use this
>> pragma.
>
> I thought there would be a way to make GNAT be an Ada compiler, but a
> quick look at the secret documentation didn't find it.
GNAT does some weird things, but this isn't one of them. Pragma
Detect_Blocking is standard Ada 2005 (added for the Ravenscar profile). It
should be the default, but it isn't because various real-time people who
ought to know better don't want to pay the miniscule cost of the check. [I
think the check should be the default with the possibility of check
suppression -- which hardly ever would be used. But some people think
possible deadlocks are a better outcome. Bah!] Because of that, almost all
Ada compilers will behave as GNAT does in this case. If you want portable
Ada code (at runtime), you need to include the pragma -- for *all*
compilers, not just GNAT. (If you are doing pure Ada 95, you are out of
luck, unfortunately.)
Randy.
next prev parent reply other threads:[~2009-10-10 5:41 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-24 17:02 Barrier re-evaluation issue with GNAT 4.3.2 Reto Buerki
2009-09-24 17:47 ` Dmitry A. Kazakov
2009-09-25 8:50 ` Brad Moore
2009-09-25 9:17 ` Dmitry A. Kazakov
2009-09-25 9:57 ` Ludovic Brenta
2009-09-25 10:31 ` Dmitry A. Kazakov
2009-09-25 11:23 ` Jean-Pierre Rosen
2009-09-28 10:41 ` Reto Buerki
2009-09-25 17:06 ` Brad Moore
2009-09-25 18:42 ` Dmitry A. Kazakov
2009-09-25 19:39 ` Brad Moore
2009-09-28 10:18 ` Reto Buerki
2009-09-25 15:56 ` John B. Matthews
2009-09-26 14:23 ` John B. Matthews
2009-09-28 10:28 ` Reto Buerki
2009-09-28 12:39 ` John B. Matthews
2009-09-28 13:25 ` Reto Buerki
2009-09-28 14:05 ` Reto Buerki
2009-09-28 18:38 ` Jeffrey R. Carter
2009-09-28 18:51 ` Dmitry A. Kazakov
2009-09-29 8:37 ` Reto Buerki
2009-09-28 21:13 ` Robert A Duff
2009-09-28 22:28 ` Jeffrey R. Carter
2009-10-10 5:41 ` Randy Brukardt [this message]
2009-09-29 8:30 ` Reto Buerki
2009-09-29 15:06 ` John B. Matthews
2009-09-30 14:12 ` Reto Buerki
2009-09-30 15:59 ` John B. Matthews
2009-10-01 16:12 ` John B. Matthews
2009-10-01 17:17 ` Anh Vo
2009-10-02 2:26 ` John B. Matthews
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