[erlang-questions] atomic ETS update with a function?

Sverker Eriksson sverker@REDACTED
Tue Nov 20 15:05:24 CET 2018

You can use ets:select_replace/2 to do an atomic compare-and-swap operation:
[Old] = ets:lookup(T, Key),
New = update_object(Old),
Success = (1 =:= ets:select_replace(T, [{Old, [], [{const, New}]}])),
ets:select_replace/2 was introduced in OTP-20.
On mån, 2018-11-19 at 18:44 +0000, Vans S wrote:
> Currently there is no atomic function to update a ETS value when its not a
> tuple.  For example if one of my ETS values is a map, and I want to put an
> element into the map, I have no atomic way to do so.
> Is there anyone else that really has a need for a function like :ets.update/3
> where arg 1 is ets_table, 2 is key, 3 is fun callback that is called passing
> the original element and the reply should be the new element?
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