Hey @Richard Gibson @Scott Christopher @kioba, I rewrote the internals of

Queue

which was based on

ZIO

to how

MVar

is build in Arrow and Cats-effects which uses lower level constructs such as

atomic

with

tailrec

instead of

Ref

. You can find the PR here, https://github.com/arrow-kt/arrow/pull/2081, there is some impact on the API. Since we can offer a more powerful API but 2 use-cases are removed. Dropping and bounded queue with capacity 0. Looking forward to your feedback on the PR 🙂

Nice work on the perf improvements! I haven’t had a close review of the implementation, but I don’t think it’s a problem to drop support for 0 capacity (I only added them because it was possible). If someone wants that behaviour then it’s probably best implementing as something new like a Channel data type which makes the behaviour explicit.

Thanks for the feedback already @Scott Christopher!

I finally had time to look at it. It is incredible job and really nice results! 🙂 Thanks for letting us look at it ❤️

Hey @kioba thanks for the feedback! Happy to hear you like the improvement ❤️ Thanks again for your contribution to

Queue

and hope to see you all in the new Arrow Fx repo soon 😉 https://github.com/arrow-kt/arrow-fx