[erlang-questions] Erlang is *not* a implementation of the Actor model Re: Go vs Erlang for distribution
Sun Jun 22 23:58:34 CEST 2014
On 2014-06-22 02:07:12 +0000, Miles Fidelman said:
> I see Erlang as an implementation of the Actor model, a la Carl Hewitt -
This crops up again and again but still isn't true.
Erlang does *not* implement Actors but processes with links/monitors
mailboxes and messages, which are not equivalent to actors.
Processes: sequence of function calls interspresed with (selective)
receives that pick out someting out of the mailbox.
Actor: has to handle every message immediately, the actions a message
triggers are happening concurrently, nothing longer running or
Hewitt says himself that Erlang does not implement Actors:
He picks on different things like "silent process failure" instead of
exceptions (which don't make much sense for somone familiar with
Erlang) and that Actors seem to be garbage collected if they are
"unneded" probably no longer referenced from the outside and Erlang
needs "internal termination".
Hewitt writes mostly what he finds lacking but on the other hand I find
the process with mailbox, selective receive and links/monitors (not ver
silent ;-) more powerful that simple Actors.
Also as aside from what I've heard Erlangs creators didn't look at
Actors when creating.
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