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Date: Mon, 20 Feb 2017 17:21:22 +0000
From: Raphael Cohn <raphael.cohn@...rmmq.com>
To: musl@...ts.openwall.com
Subject: Re: No definition of PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP in musl

On 20 February 2017 at 16:24, Markus Wichmann <nullplan@....net> wrote:

> On Mon, Feb 20, 2017 at 03:22:41PM +0000, Raphael Cohn wrote:
> > Hi,
> >
> > Whilst trying to compile ReOpenLDAP (https://github.com/ReOpen/
> ReOpenLDAP),
> > a fork of OpenLDAP, I'm running into a wall. Some of the code wants a
> > definition of PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP. musl doesn't
> define
> > this; I suspect this is a non-portable glibc extension in pthread.h. Does
> > any one have any ideas how I might workaround this? Is there an
> alternative
> > construction that the code could use?
> >
>
> Well, not directly.
>
> PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP is an initializer that makes a
> mutex recursive. What you could do is look for a single use
> initialization function. Then you could replace
>
> static pthread_mutex_t mut = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
>
> with
>
> static pthread_mutex_t mut;
>
> ...
>     pthread_mutexattr_t mutattr = {0};
>     pthread_mutexattr_init(&mutattr);
>     pthread_mutexattr_settype(&mutattr, PTHREAD_MUTEX_RECURSIVE);
>     pthread_mutex_init(&mut, &mutattr);
>     pthread_mutexattr_destroy(&mutattr);
> ...
>
> That's the portable way to do it. However, the nonportable solution is
> generally used to avoid the one-time initialization otherwise necessary.
> As such, there may not be a place for you to put the above snippet. In
> that case you may have to introduce such a function.
>
> Alternatively, you could look up the effects the above snippet has on
> the mutex under musl, at least at the moment, and declare the
> nonportable initializer yourself. At the moment, I think it would be
>
> #define PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP {{PTHREAD_MUTEX_RECURSIVE}}
>
> > Any help gladly appreciated.
> >
>
> Hope it helps.
>
> > Raph
> >
>
> Ciao,
> Markus
>

Thank you Markus and Rich for your help and suggestions. I have a good idea
how to tackle this now.

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