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Guest
Posted: Wed Sep 19, 2007 9:17 am Reply with quote
Guest
I might step into something unplesent here, but...

I think Christian and Matthias ment that Ulf's statement was
an example that demonstrated it must be allowed to call
gen_server:reply/2 both before and after return {noreply,_},
or else it would be unusable.



On Tue, Sep 18, 2007 at 07:09:41PM -0500, Scott Lystig Fritchie wrote:
> >>>>> "ml" == Matthias Lang <matthias@corelatus.se> writes:
>
> ml> Christian S writes:
>
> >> One case that struck my mind is when one spaws a process to do
> >> something and return the value with gen_server:reply/2. That
> >> requires gen_server:reply/2 to need to be executed before the
> >> gen_server:handle_call/3 returns noreply.
>
> ml> That's a good point. That pretty much kills my doubts.
>
> I'm now quite puzzled. Perhaps I haven't had enough coffee today.
>
> Assume the following two timelines, where time advances as we read
> from top to bottom:
>
> gen_server proc helper proc
> --------------- -----------
> start executing handle_call/3
> spawn helper proc
> do stuff for arbitrary time...
> call gen_server:reply/2
> return {noreply, ...}
>
> My understanding of Christian's statement is that this timeline
> results in invalid behavior:
>
> gen_server proc helper proc
> --------------- -----------
> start executing handle_call/3
> spawn helper proc
> do stuff for arbitrary time...
> return {noreply, ...}
> call gen_server:reply/2
>
> If my understanding is correct, then Christian's statement is not
> correct: the server's apparent behavior will be correct in either
> timeline.
>
> -Scott
> _______________________________________________
> erlang-questions mailing list
> erlang-questions@erlang.org
> http://www.erlang.org/mailman/listinfo/erlang-questions

--

/ Raimo Niskanen, Erlang/OTP, Ericsson AB
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