Re: pthread library related

[christos%astron.com@localhost (Christos Zoulas)]

In article <20160520091545.GA30887%britannica.bec.de@localhost>,
Joerg Sonnenberger  <joerg%bec.de@localhost> wrote:
>On Thu, May 19, 2016 at 01:36:29PM -0400, Christos Zoulas wrote:
>> You can see how FreeBSD is implementing them; it is a lot of code to do
>> this and would require some architectural review. The relevant files are:
>> 
>> http://nxr.netbsd.org/xref/src-freebsd/lib/libthr/thread/thr_pshared.c
>> http://nxr.netbsd.org/xref/src-freebsd/lib/libthr/thread/thr_barrierattr.c
>> http://nxr.netbsd.org/xref/src-freebsd/sys/kern/kern_umtx.c
>> 
>> We don't have such mutex functionality in our kernel. Implementing this
>> would be a GSoC project in itself.
>
>I don't think we want to use futexes in general. I'm not even sure I
>care about performance for something horrible like "robust" mutexes at
>all. A good starting point might to just extend the existing semaphores,
>if necessary.

Yes, but should we commit the proposed ENOSYS stubs in the meantime just
to have the functions available? I am not sure...

christos