From: Fredrik Kuivinen <frekui@gmail.com>
Date: Thu, 08 Apr 2010 09:01:05 GMT
Subject: Re: What's cooking in git.git (Apr 2010, #03; Wed, 07)
Message-ID: <o2u4c8ef71004080201pdbdc7aa8j99500d7643c278c9@mail.gmail.com>
In-Reply-To: <7vwrwi78t7.fsf@alter.siamese.dyndns.org>

On Thu, Apr 8, 2010 at 08:33, Junio C Hamano <gitster@pobox.com> wrote:
> Johannes Sixt <j.sixt@viscovery.net> writes:
>> BTW, are there Unices that do not have a recursive mutex?
>
> PTHREAD_MUTEX_RECURSIVE is not marked as optional in any way, so I would
> imagine an implementation that lacks it would say NO_PTHREADS in the
> Makefile.
>
> Cf.
>
>  http://www.opengroup.org/onlinepubs/9699919799/basedefs/pthread.h.html

For some reason I looked at Issue 6 of the standard (a previous
version, released in 2004). In that version pthread_mutexattr_settype
and PTHREAD_MUTEX_RECURSIVE are optional. See
http://www.opengroup.org/onlinepubs/009695399/basedefs/pthread.h.html

However, it is probably best to just ignore the issue for now until
some platform appears where pthreads is available but not recursive
mutexes.

- Fredrik