[erlang-questions] Scoped group leaders

Frédéric Trottier-Hébert fred.hebert@REDACTED
Mon Jul 4 16:19:22 CEST 2011

I agree this might be quite useful. To me one of the interesting points has to be the possibility to write your own protocols similar to the IO one. I could see something like a web server or any other resource handler of the kind allowing a bunch of workers to pipe their output straight out to some socket, file descriptor or whatever. 

The abstractions put in place in front of the IO server could be used across other resources with potentially different semantics (and thus requiring a different protocol). This could be a nice step towards that.

Fred Hébert

On 2011-07-04, at 10:15 AM, Eric Merritt wrote:

> I can actually see a ton of uses for this. Not the least of which is
> security, I just did a deep security piece in an erlang app, and it
> turned out well, but I could see where something like this would have
> made it much more elegant. The only thing that would concern me (from
> looking at your implementation) is how much over head is added to
> process creation. I think thats probably the main unknown, there are
> probably some other things as well.
> Just out of curiosity does a group leader go away when a group dies?
> On Sat, Jul 2, 2011 at 7:38 PM, Yurii Rashkovskii <yrashk@REDACTED> wrote:
>> Hi,
>> I had an idea to play with this long weekend and I want to share some
>> results and get some feedback.
>> Basically, I was wondering whether it will be feasible to extend the
>> concept of group leaders beyond I/O so that you can build your own
>> primitives around this construct of inherited group leaders. It seemed
>> to me that tasks like implicit configuration, security groups and such
>> can benefit from having a more generalized group leadership mechanism.
>> In the last two days I wrote a quick-n-dirty proof of concept
>> implementation (https://github.com/spawngrid/otp/tree/group_leader_scope),
>> it's pretty rough but seems to work. I also wrote an early draft of an
>> EEP for this feature
>> (https://github.com/spawngrid/eep/blob/scoped-group-leaders/eeps/eep-scoped-group-leaders.md).
>> The EEP has some examples, and you can play with that PoC
>> implementation (group_leader_scope branch). It's not ready for the
>> prime time, though — it lacks automated tests and the performance
>> implications have not yet been measured (although this should be fixed
>> soon). No optimizations were considered at this moment.
>> The EEP draft itself has not been sent to EEP editors as I plan to
>> elaborate on motivations and possibly add more examples.
>> Either way, please let me know if this is of any interest to anybody
>> and if you have any thoughts about it.
>> Have a nice weekend,
>> Yurii.
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