is it fixed #3900 #3862?

how it performance in threadring benchmark https://github.com/kostya/crystal-benchmarks-game#threadring?

Thanks for the PR @firejox. However, part of the team is currently working heavily on multi threading support, so I'd advise against submitting large changes relative to the design of channels, at least until this stabilizes.

Also, besides multithreading in particular, please refrain from submitting PRs that involve large changes without opening an issue to discuss it first: otherwise you risk spending a lot of time working on an implementation for something that was not to be accepted for some particular reason.

@kostya Yes, it would fix those issues. Every select will not run more than one times coroutine switch. and here is the performance https://gist.github.com/firejox/f9fb7c4b6d44501d0b1070c123a1fab6
it is slower than origin but still faster than other language.

@spalladino Sorry for without opening issue first. Now I open a issue to discuss this.

Now the rewrite is done. 😃

Channel and all other concurrency-related stuff are only handled by the core team. And also they are working on it so these changes won't be compatible with them.