[erlang-questions] BIF or NIF for extending Erlang on OS which can't dynamic link

Jared Kofron <>
Mon May 7 17:30:05 CEST 2012


Very cool, I was just wondering as I use Erlang for a lot of process
control type
projects.  A lot of folks in my field use RTEMS, so I thought there may be
some
crossover.  Looking forward to hearing about your results!

JK

On Mon, May 7, 2012 at 8:27 AM, Peer Stritzinger <> wrote:

> On Fri, May 4, 2012 at 8:00 PM, Jared Kofron <>
> wrote:
> > I'm curious what you are working on that you would be porting Erlang to
> > RTEMS?
>
> Its work for a customer, can't tell too much about it yet.  Its for a
> small industrial control component that has the following
> requirements:
>
> * physically small + hardware cost sensitive + support for a wide area
> of industrial communication protocols
>
> This results in choice of a SoC (MPC8309 from Freescale in our case)
> with only some NAND flash and limited RAM.
>
> * Some uses have hard realtime requirements, but many have soft
> realtime requirements and some dynamic memory use.
>
> So we have the hard realtime parts running in a RTEMS thread with
> higher prio than the Erlang VM's threads.
>
> Do I have to elaborate why not to write it completely in C on this
> list?  Erlang is a great choice for most of the stuff we want to do
> with this platform.
>
> Besides RTEMS and Erlang fit quite well, both are built for high
> reliability (RTEMS is running on plenty of satelites and planetary
> probes e.g.), RTEMS has very fast thread switching and the amount of
> code run with higher prio than Erlang can be reduced to a minimum.
> This should result in higher responsiveness for Erlang since it can
> basically running on the bare metal with no preemption at all.
>
> I have built larger embedded systems where Erlang is running on top of
> FreeBSD talking to hardware boards running RTEMS via USB.  There I
> found the collaboration of RTEMS (for the hard realtime, ultra low
> latency stuff) and Erlang (for as much of the rest as possible) very
> useful.
>
> So it was a natural choice to put Erlang and RTEMS on the same CPU if
> we don't have the room/"price budget" to use separate CPU's.
>
> So far everything looks well, there will be more info about this at a
> later point in time.
>
> And the RTEMS + Erlang code/build system etc. will be published
> (preferably by committing as much as possible back to the respective
> projects)
>
> Cheers,
> -- Peer Stritzinger
>
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