From: Reto Buerki <reet@codelabs.ch>
Subject: Re: Barrier re-evaluation issue with GNAT 4.3.2
Date: Wed, 30 Sep 2009 16:12:46 +0200
Date: 2009-09-30T16:12:46+02:00 [thread overview]
Message-ID: <h9vp0g$1kn$1@news.eternal-september.org> (raw)
In-Reply-To: <nospam-262F9A.11064729092009@news.aioe.org>
John B. Matthews wrote:
> In article <h9sgj7$1qr$1@news.eternal-september.org>,
> Reto Buerki <reet@codelabs.ch> wrote:
>
>> Jeffrey R. Carter wrote:
>>> An entry call is always potentially blocking, regardless of its barrier;
>>> see ARM 9.5.1. Technically, this code contains a bounded error. Since
>>> the potentially blocking operation was detected, your program should
>>> raise Program_Error; GNAT pretends that it hasn't detected that the
>>> operation is potentially blocking and lets you get away with only a
>>> warning. Other compilers (and even other versions of GNAT) may actually
>>> raise Program_Error.
>> Thanks for the clarification and the pointer to the ARM. This basically
>> means that our workaround is not legal Ada code ...
>
> Well, it's a bounded error. Using Pragma Detect_Blocking, as suggested
> by Bob Duff, will tell you if the compiler's warning is actualized at
> run-time. As this is a work-around and your original code seems correct,
> you might arrange things so that the original can be restored easily
> upon upgrade or port.
The code runs correctly even though Program_Error is raised when
compiled with the Detect_Blocking pragma.
I think it's good enough as a workaround, we will upgrade to GNAT 4.4.x
as soon as possible.
Thanks for all your help!
next prev parent reply other threads:[~2009-09-30 14:12 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
2009-09-29 8:30 ` Reto Buerki
2009-09-29 15:06 ` John B. Matthews
2009-09-30 14:12 ` Reto Buerki [this message]
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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