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> the word "thread" does not appear anywhere.
because it doesn't use threads? The library is intended to be used inside an eventloop. I think the same also applies for other typical transport libraries - e.g. HTTP/2 or TLS ones.
> Not sure why one would choose this over QUICHE.
I think there are certainly reasons. lsquic seems a lot more optimized than quiche and most other libraries out there. It makes use of some pretty clever datastructures (e.g. https://github.com/litespeedtech/lsquic/blob/master/src/libl...), and likely has a drastically lower rate of heap allocations than other implementations. Some of those things - like the use of intrusive linked lists - are unfortunately not that easy to apply in Rust.
I wouldn't be suprised if lsquic outperforms various other implementations - and if that's important to users it might be a reason to choose it (but as always: measure for your use-case).
I personally also think Rust is the way to go for system level code. But I wouldn't dismiss a project for not using Rust. And this one at least has a fair set of unit-tests, so it looks to me a lot more sane than a lot of other C based projects.
That seems more like an implementation issue than a general one. Netty integrates quiche for QUIC support: https://github.com/netty/netty-incubator-codec-quic