From: "luke-gru (Luke Gruber) via ruby-core" <ruby-core@...>
Date: 2024-04-26T17:51:52+00:00
Subject: [ruby-core:117730] [Ruby master Misc#20272] Ambiguity around Ractor message sending FIFO semantics

Issue #20272 has been updated by luke-gru (Luke Gruber).


The messages in that case would be guaranteed to be received in order (first "hello" then "world").

If you have 2 different ractors or 2 different threads both receiving messages from the same ractor, then there is no guarantee of the order.



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Misc #20272: Ambiguity around Ractor message sending FIFO semantics
https://bugs.ruby-lang.org/issues/20272#change-108137

* Author: forthoney (Seong-Heon Jung)
* Status: Open
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The docs should explicitly state the semantics/properties of Ractor message, especially when it comes to FIFO.
For example, assume I have two Ractors, Ractor A and Ractor B. Ractor A sends two messages `"hello"` and `"world"` in this order to Ractor B.
If I call `Ractor.receive` on Ractor B, am I guaranteed to see `"hello"` and then `"world"` or is it possible the messages are delivered out of order?



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