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by samsquire 1281 days ago
I am pleased to see a language that focuses on good multithreaded support.

I tend to use Java and C for multithreaded problems but having the availability of Nim which looks similar to Python is really promising.
1 comments
zozbot234 1281 days ago
If you want good multithreaded support and don't care much about ensuring perfect thread-safety at all times, you can't beat Go for real-world use.
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samsquire 1281 days ago
Yes I like Go but I am yet to do any professional development in it.

Go is a M:N scheduler with M kernel threads and N lightweight threads

I wrote a 1:M:N lightweight scheduler which preempts hot loops. I don't know when Golang preempt goroutines outside of a channel send - I believe it's in stack growth or in other words when a method is called.

My userspace scheduler preempts while true and for loops by setting the looping variable to the limit.

I wrote it in Java, C and Rust.

https://GitHub.com/samsquire/preemptible-thread

Does anybody know if Nim loop variables can be easily mutated from another thread?

It looks they cannot

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elcritch 1281 days ago
No, not directly but Nim supports async. Effectively it turns the function into an Iterator whose state can be passed around. Those are put into Futures.

Its possible to write your own async engine, or you could use the iterator yourself if you really wanted. It's actually not too hard.

Checkout: https://github.com/status-im/nim-taskpools

Edit: also Nim compiles to C, so its possible to do whatever you can do in C with a bit of fiddling. Also theres coro https://nim-lang.org/docs/coro.html

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mikedelago 1281 days ago
Elixir fits in here as well, if the workload is thread-bound and not computation bound.

I think Elixir's syntax and idioms are better than Go's, but that's personal preference.

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