[erlang-questions] Singleton Process

Zvi <>
Fri Feb 6 00:32:29 CET 2009



Bernard Duggan-2 wrote:
> 
> Hi Edward,
> 	Your code is a pretty reasonable attempt at a basic implementation (and
> I don't mean that in any derogatory or rude sense - much of my code from
> not very long ago follows a similar pattern).
> 	The most obvious problem I can see with it is the race condition in
> start() - if two processes call next_id() at the same time, they could
> both call whereis(counter) and receive 'undefined' as the response -
> they'd both then try to spawn  and register the process, 

Hi, Bernard

what's your suggested workarround for this problem?
I think the calls to whereis must be serialized in some way...

Zvi
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