From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
Cc: Xenomai Mailing List <xenomai@xenomai.org>
Subject: Re: [Xenomai] Why does mqueue.h define mqd_t as unsigned
Date: Fri, 10 Apr 2015 16:50:35 +0200 [thread overview]
Message-ID: <20150410145035.GN20752@hermes.click-hack.org> (raw)
In-Reply-To: <20150410144410.GF29558@csclub.uwaterloo.ca>
On Fri, Apr 10, 2015 at 10:44:10AM -0400, Lennart Sorensen wrote:
> 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.
>
> Yeah "Posix says so" always wins any argument it seems. :)
Adding #define MQ_FAILED ((mqd_t)-1) in your application and using
it makes your application portable. Adding it to Xenomai headers and
using it in your application makes your application non portable. If
the POSIX standard added this definition, then if you wanted your
application to be portable, you would want it to support previous
POSIX standards, so you would still add this definition to your
application (with an added ifdef on the posix standard level).
So, all and all, adding #define MQ_FAILED ((mqd_t)-1) to your
application and move on wins the argument.
--
Gilles.
prev parent reply other threads:[~2015-04-10 14:50 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
2015-04-10 14:44 ` Lennart Sorensen
2015-04-10 14:50 ` Gilles Chanteperdrix [this message]
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