Does the Rust actors framework Actix guarantee message order between two actors?

Question

In the case of one single actor sending a message to another single actor.

I couldn't find anything about this in the official documentation.

Note: if you have not already, I suggest asking on the r/rust reddit channel, where the author of the framework is quite active. If you do so, please be sure to cross-reference with this question. — Matthieu M.
@GustavoBasso If you get an answer there, don't forget to come back here and answer your own question in case someone else would ever have the same! — mcarton

dustin.b dustin.b · Accepted Answer · 2018-04-11T15:52:23

The order in which messages are received from one single actor to another single actor is deterministic:

Order is deterministic. Actix uses mpsc queue for messages