Preventing multiple instances through register/2

[Richard Carlsson]

Jeff Crane wrote:
> Yes it gets caught, but it also still spawns! What's
> the proper way to prevent a duplicate spawn if not
> through case catch register(spawn) ? 

Let the spawned process try to register itself, or exit if
it does not succeed. In either case, send a message to the
(waiting) parent process, informing it of the outcome,
before terminating or getting on with the real work.

	/Richard


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