4 ms·

> Oh yea, and green threads, god do I wish Rust had green threads. They still don't? I thought they were working on that years ago, no?

notheguyouthink 9y ago
They had green threads, but removed it. To my knowledge, there are multiple libraries that effectively implement green threads, but it's still a work in progress. Might be production ready, not sure, but I believe at the very least the ergonomics are a work in progress.
- vanderZwan 9y ago
  Hmm, sounds like the kind of thing that is hard to get right then. Maybe it's for the best that it isn't in the standard library until the design and implementation stabilises then. Sucks for early adopters though!
  - vertex-four 9y ago
    I doubt Rust will ever get green threads - it turns out that OS threads are good enough, and futures (async/await) is how IO will get dealt with at scale. Green threads don’t help compute-bound code, so with a solution in place for IO, they’re unnecessary.
    - steveklabnik 9y ago
      It's quite unlikely that Rust the language will get green threads, yes. We are getting stackless couroutines ("generators"), which are related but not the same thing. There's a ton of options in this space, and they're all slightly different, with different tradeoffs, so it's really hard to make good comparisons. You have to deeply understand exactly what each language is doing.
steveklabnik 9y ago
1. long ago, we used to have green threads and a runtime 2. we decided to eschew the runtime, and therefore, the green threads. 3. Since then, various libraries have implemented green threads in various ways 4. Tokio is basically green threads today. It really depends on what you mean exactly by "green threads".; but it schedules N tasks on M OS threads, so...
- vanderZwan 9y ago
  Thank you for clarifying! > 2. we decided to eschew the runtime, and therefore, the green threads. The most important bit I guess, regarding the question of whether Rust will ever have green threads/fibers/trails/whatever (answer: no, because no runtime).
  - steveklabnik 9y ago
    Not built into Rust, yes. But since Rust has no runtime, if you want those things, you can bring them along, as a library. The danger there is splitting an ecosystem, but in general the community has been sensitive to this, and once Tokio was determined as the way forward, the other projects stopped to throw their weight behind it too.

notheguyouthink 9y ago

They had green threads, but removed it. To my knowledge, there are multiple libraries that effectively implement green threads, but it's still a work in progress. Might be production ready, not sure, but I believe at the very least the ergonomics are a work in progress.

vanderZwan 9y ago
Hmm, sounds like the kind of thing that is hard to get right then. Maybe it's for the best that it isn't in the standard library until the design and implementation stabilises then. Sucks for early adopters though!
- vertex-four 9y ago
  I doubt Rust will ever get green threads - it turns out that OS threads are good enough, and futures (async/await) is how IO will get dealt with at scale. Green threads don’t help compute-bound code, so with a solution in place for IO, they’re unnecessary.
  - steveklabnik 9y ago
    It's quite unlikely that Rust the language will get green threads, yes. We are getting stackless couroutines ("generators"), which are related but not the same thing. There's a ton of options in this space, and they're all slightly different, with different tradeoffs, so it's really hard to make good comparisons. You have to deeply understand exactly what each language is doing.

steveklabnik 9y ago

1. long ago, we used to have green threads and a runtime 2. we decided to eschew the runtime, and therefore, the green threads. 3. Since then, various libraries have implemented green threads in various ways 4. Tokio is basically green threads today. It really depends on what you mean exactly by "green threads".; but it schedules N tasks on M OS threads, so...

vanderZwan 9y ago
Thank you for clarifying! > 2. we decided to eschew the runtime, and therefore, the green threads. The most important bit I guess, regarding the question of whether Rust will ever have green threads/fibers/trails/whatever (answer: no, because no runtime).
- steveklabnik 9y ago
  Not built into Rust, yes. But since Rust has no runtime, if you want those things, you can bring them along, as a library. The danger there is splitting an ecosystem, but in general the community has been sensitive to this, and once Tokio was determined as the way forward, the other projects stopped to throw their weight behind it too.