Re: POSIX API for EVL

[Philippe Gerum <rpm@xenomai.org>]

Pierre FICHEUX <pierre.ficheux@smile.fr> writes:

> Hi all,
>
> I've read some discussions (may 2024) about the lack of POSIX skin in
> EVL.  Supporting several skins just like for Xenomai 3 is not
> really useful but POSIX is an industrial standard and so for people
> willing to use Xenomai instead of PREEMPT_RT.
>
> In the EVL documentation
> (https://evlproject.org/core/user-api/thread/) I can read :
>
> The main kernel’s thread is the basic execution unit in EVL.
> The most common kind of EVL threads is a regular POSIX thread started
> by pthread_create(3) which has attached itself to the EVL core by a
> call to evl_attach_self().
>
> Don't you think a kind of POSIX "wrapper" could be useful or is that a
> silly question ? Did I miss anything ?
>
> I'm about to start a study for a big industrial company and the lack
> of POSIX support is a real issue.
>

Years ago, there has been a proposal for a Common Xenomai Platform
effort (aka CXP). Its purpose was to establish bridges between the
xenomai3 and xenomai4 systems, user space (e.g. POSIX interface for evl)
and kernel space (e.g. RTDM emulation over the evl kernel API)
included. AFAIR, this proposal did not get any traction, no user
feedback showing interest on this list, so it had to be ditched as a
consequence. The only way to revive this effort is contributing detailed
ideas, a plan and some code.

-- 
Philippe.