Date: Mon, 28 Nov 2016 16:53:09 -0500 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: Robust shared mutexes? On Mon, Nov 28, 2016 at 01:36:50PM -0800, Khem Raj wrote: > > > On Nov 26, 2016, at 2:56 PM, Rich Felker <dalias@...c.org> wrote: > > > > On Sat, Nov 26, 2016 at 11:51:05PM +0100, Sebastian Kemper wrote: > >> On Sat, Nov 26, 2016 at 05:24:43PM -0500, Rich Felker wrote: > >>> On Sat, Nov 26, 2016 at 10:49:44PM +0100, Sebastian Kemper wrote: > >>>> Hello all, > >>>> > >>>> I'm cross-compiling for OpenWRT/LEDE and have this variable > >>>> apr_cv_mutex_robust_shared. Should I set it to yes or no with musl? I've > >>>> searched around but found conflicting infos. One post said there's no > >>>> shared mutex support in musl > >>> > >>> Do you have a link for that? If there's incorrect information I'd like > >>> to reply and see if it can be corrected. > >> > >> Hello Rich, > >> > >> Thank you very much for the reply! > >> > >> I looked for the link and it turns out it was an error on my part. The > >> post wasn't referring to robust shared mutexes. It was regarding process > >> shared mutexes > >> > >> http://lists.openembedded.org/pipermail/openembedded-core/2016-March/119214.html > >> > >> It says musl doesn't have process shared mutexes so one should set > >> apr_cv_process_shared_works=no. I take it that is correct? > > > > No, it's incorrect and I have no idea where that idea came from. I'll > > ask Khem. > > > > IIRC it was not musl but papering over apr specific issue. I never got time to really dig in > to root cause it. Indeed, that's what it seems to be here too. They don't support the standard API, only some ancient glibc _NP version of it, and they don't even do anything to handle the case of ownerdied correctly... Rich
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