Hey everybody! I’m delving into Rustler to enable some work on data frames in Elixir backed by polars. I’m feeling pretty confident in the mental model of using a nif resource and delegating to native functions for much of the API. One place I’m struggling to get my head around is arbitrary elixir f…

Thanks José! I suppose I’ll cross that bridge when I get there then. Won’t hurt to start with serialise/apply/deserialise. I’m not sure if pyo3’s approach of embedding a Python interpreter in the binary is particularly reasonable anyway. I may be imagining bottlenecks in copying before I’ve proved t…

Not sure how helpful this is, but if you can link C libs and you want to serialise stuff, there’s Erlang Interface / docs You can then from C encode terms: void respond_with_window(osea_CTX *osea_ctx) { char msg[2], finish[2]; ei_x_buff buf; ei_x_new_with_version(&buf); msg[0] = RSP_WINDO…

Hi, I am pretty sure it’s possible to call from a NIF into elixir because I’m doing just that in wasmex :wink: Someone asked about how I do that in a GitHub issue where I explained the why’s and how’s in a little more detail: https://github.com/tessi/wasmex/issues/256#issuecomment-848339952 Feel…

Hi @tessi , thanks for taking time to write this approach. I also played around same idea in the past (in C though). Just want to highlight the risks involved if someone is considering since mutex does not compose well, its easy to end-up with deadlocks. Especially if the callback is not internal …

Thanks @akash-akya your points are very valid. The whole thing is a big dance for just calling into Elixir. But it’s possible. I think in Rust, the thread handling part is a little more safe, but still deadlocks are possible. (we could build in timeouts, though, so that things eventually return). A…

Thanks! Wow, @tessi that is very impressive work. Your explanation of the ResourceArc is really helpful for me and I’d love to see clearer explanations like that in the official documentation. That’s really where I’m hurting the most. Definitely simplified in 0.22.0-rc though. Probably not terribly…

Wow that’s super impressive. It’s giving me ideas though, I think there might be a clever and safe way of doing this in zigler by yielding first, and storing the frame, then resuming once the result term has come back. If the owning process is killed, the resource can be freed and the yield will e…

Elixir Programming Language Forum

Calling Elixir in Rust?

Questions & Help Questions

josevalim May 31, 2021, 5:33am 2

As far as I know it is not possible to call Elixir/Erlang functions from C/Rust code.