Hi I’m Koichi. Allow me to ask the crystal language question. (I’m not a Crystal user, but a Ruby user, developer). I understand Fiber will switch when runtime requires, such as blocking I/O operation and so on. My question is, no atomicity problem? Example: person = ["Alice", 10] # name and ag…

This thread seems appropriate to point out a recent study over real-world concurrency bugs in Go. The paper is available at https://songlh.github.io/paper/go-study.pdf , and there is a nice wrap-up blog post about it: https://blog.acolyer.org/2019/05/17/understanding-real-world-concurrency-bugs-in-g…

It’s also worth mentioning a few things: Crystal is still pretty young and its usage, compared to Go and Ruby, is not that high. That’s why there doesn’t seem to be a lot of code out there taking the most out of spawn and fibers. Crystal runs on a single thread so even though data races are possib…

I use fibers inside the Task Monads https://github.com/alex-lairan/monads/blob/master/src/monads/task.cr The advantage is that you don’t have to think about concurency, just say you have a task it may fail, and do something else. When you need the data from the task, 2 possibilities : 1 - The task…

Could something like STM in Haskell and Clojure be implemented in Crystal? I don’t know if it is even possible, or how hard it would be. But that might turn out to be a good solution.

[image] bcardiff: Yes. We’ve been working on it. Stay tuned. Interesting! Mutex is shared with Fibers and Threads? (maybe same situation with Ruby’s plan) [image] bcardiff: The program runs in single-thread, unless there is an IO, Channel operations or Fiber.yield there will be no surpri…

[image] rumenzu: This thread seems appropriate to point out a recent study over real-world concurrency bugs in Go. Thank you for sharing great summary. I only know the title of this paper, but not read yet. BTW (completely off-topic) Message passing seems to introduce more blocking issues …

[image] curious2learn: Could something like STM in Haskell and Clojure be implemented in Crystal? I don’t know if it is even possible, or how hard it would be. But that might turn out to be a good solution. One comment (off-topic too. Sorry): Haskell and Clojure are basically immutable langu…

@ko1 Wouldn’t most pure ruby (not C extensions) run correctly multithreaded without the GIL if Mutex was Fiber safe? C extensions could use a recursion safe global lock with additional functions to change lock granularity such as: # Method is thread safe. No locking. rb_method_thread_safe(...) # …

In Ruby, nothing is thread save because of the GIL. Having thread save mutexes doesn’t help anything. At least common data types like Array need to be thread save as well.

All of the ruby programs I’ve worked with used Mutexes around shared data structures to avoid race conditions. Modifying an Array inside a Mutex is safe correct?

Fiber is danger or not on Crystal?

bcardiff September 6, 2019, 3:32pm 31

@ko1 the blog post is finally out Blog: Parallelism in Crystal

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Fiber is danger or not on Crystal?

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