[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <1409468962.4476.268.camel@eris.loria.fr>
Date: Sun, 31 Aug 2014 09:09:22 +0200
From: Jens Gustedt <jens.gustedt@...ia.fr>
To: musl@...ts.openwall.com
Subject: Re: C threads, v. 6.2
Am Samstag, den 30.08.2014, 22:44 -0400 schrieb Rich Felker:
> On Sat, Aug 30, 2014 at 09:31:11PM -0400, Rich Felker wrote:
> > On Sat, Aug 30, 2014 at 08:30:34PM -0400, Rich Felker wrote:
> > > > For the C thread TU, what would be the mechanics for them to call one
> > > > of the (aliased) pthread functions?
> > >
> > > With my alternate solution just described, simply including the normal
> > > pthread header and casting the pointer when making the call would be
> > > fully legal.
> > >
> > > With the approach we previously discussed, where we have to ensure
> > > that no TU that accesses the contents of a mutex or cv structure can
> > > see both the C11 and POSIX versions, The C11 TUs would have to contain
> > > prototypes for the aliased POSIX functions like:
> > >
> > > int __pthread_mutex_lock(mtx_t *);
> > >
> > > Note that this is a perfectly correct prototype because mtx_t is just
> > > this TU's typedef name for the tagless "struct { union { ... } __u; }"
> > > that it's using, which is "the same type" as pthread_mutex_lock.c's
> > > pthread_mutex_t.
> >
> > Actually, unless the C11 functions actually access the mutex object,
> > their implementation files don't need to avoid having both types
> > visible. Only the TUs that dereference the object (i.e. the pthread
> > ones) need to ensure that only one version of the type is visible.
>
> The more I think about it, the more I think the visibility of the
> other type is utterly irrelevant.
Yes, inside the C thread implementation it is. So as you have seen I
already came to the same conclusion, and so I applied that idea to the
latest series of patches.
I think this discussion is settled, then.
Jens
--
:: INRIA Nancy Grand Est ::: AlGorille ::: ICube/ICPS :::
:: ::::::::::::::: office Strasbourg : +33 368854536 ::
:: :::::::::::::::::::::: gsm France : +33 651400183 ::
:: ::::::::::::::: gsm international : +49 15737185122 ::
:: http://icube-icps.unistra.fr/index.php/Jens_Gustedt ::
Download attachment "signature.asc" of type "application/pgp-signature" (199 bytes)
Powered by blists - more mailing lists
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
