From: Lowell Gilbert <kludge@be-well.ilk.org>
To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: Xenomai Mailing List <xenomai@xenomai.org>
Subject: Re: [Xenomai] Why does mqueue.h define mqd_t as unsigned
Date: Thu, 09 Apr 2015 19:17:53 -0400 [thread overview]
Message-ID: <44wq1knb6m.fsf@lowell-desk.lan> (raw)
In-Reply-To: <20150409222914.GJ20752@hermes.click-hack.org> (Gilles Chanteperdrix's message of "Fri, 10 Apr 2015 00:29:14 +0200")
Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org> writes:
> On Fri, Apr 10, 2015 at 12:17:18AM +0200, Gilles Chanteperdrix wrote:
>> This design is specified by POSIX. This looks like a "fighting the
>> windmill" case.
>
> I think the upside of this design is that it allows mqd_t being
> implemented as a pointer or as an integer, this gives freedom to the
> implementer by making the type opaque.
Yes, but in other cases POSIX specified symbolic constants rather than
numeric values for exactly that problem. It's possible that somebody just
made a mistake by not doing that here, but I would venture to guess that
there was probably an issue with existing code that led to this hack.
next prev parent reply other threads:[~2015-04-09 23:17 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-09 20:52 [Xenomai] Why does mqueue.h define mqd_t as unsigned Phil Mitchell
2015-04-09 21:07 ` Gilles Chanteperdrix
2015-04-10 18:55 ` Gilles Chanteperdrix
2015-04-09 21:11 ` Paul Janzen
2015-04-09 22:09 ` Lennart Sorensen
2015-04-09 22:17 ` Gilles Chanteperdrix
2015-04-09 22:29 ` Gilles Chanteperdrix
2015-04-09 23:17 ` Lowell Gilbert [this message]
2015-04-10 14:44 ` Lennart Sorensen
2015-04-10 14:50 ` Gilles Chanteperdrix
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