[erlang-questions] Sending message to process already listening on a socket
Wed Aug 1 02:49:26 CEST 2007
Ben Hood wrote:
> Thanks for you help.
> On 7/31/07, Matthias Lang <> wrote:
>> 1. Yes, messages are queued up until consumed.
> I've been wondering about the formal semantics of erlang message
It is 1-1 FIFO; that is, messages are queued in FIFO order between
any given pair of processes, but there are no other constraints on
ordering. For a formal definition of 1-1 FIFO, see Definition 3.3
Bernadette Charron–Bost, Friedemann Mattern, Gerard Tel
"Synchronous, asynchronous, and causally ordered communication"
Distributed Computing (1996) 2:173--191, Springer-Verlag.
(that paper just calls it "FIFO").
A brief explanation, so you don't necessarily have to read the
whole paper: a pair (s, r) represents a message transmission where
s is the send event, and r is the receive event. So Definition 3.3
says that if two messages are sent by the same process (s ~ s') and
received by the same process (r ~ r'), then they are received in
the same order they were sent (s < s' => r' < r').
Note that messages will be dropped if the target process dies, or
if there is a network error when a message is being sent between
David Hopwood <>
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