> At least, such feature should be located at ext/fiber.

even if ext/fiber it is still should be implemented in C .

> I'm afraid that introducing such feature increases complexity of Fiber.

Not too much. Look at the patch: it uses same hook as rb_fiber_terminate.

By the way, why Thread has this feature?
http://www.ruby-doc.org/core-2.1.3/Thread.html#method-i-raise
And why Fiber hasn't? In fact, it is strange that this feature still not
presented, cause it is expected to exists.


2014-10-16 8:41 GMT+04:00 <ko1 / atdot.net>:

> Issue #10344 has been updated by Koichi Sasada.
>
>
>  On 2014/10/12 1:28, Knut.Franke / gmx.de wrote:
>  > For some more sophisticated examples, see
> https://github.com/nome/coroutines. The library does work with vanilla
> Ruby, but the patch improves performance.
>  >
>  > Also, similar code can be simplified by using Fiber#raise. Compare e.g.
> the two implementation of Consumer::Yielder#await at
>  > https://github.com/nome/coroutines/blob/master/lib/coroutines/base.rb
>
>  I understand this feature helps some libraries. But I can't understand
>  why it is important.
>
>  I'm afraid that introducing such feature increases complexity of Fiber.
>  Basically, I want to recommend strongly that using Fiber as
>  semi-croutine, ristricted feature.
>
>  At least, such feature should be located at ext/fiber.
>
>  --
>  // SASADA Koichi at atdot dot net
>
> ----------------------------------------
> Feature #10344: [PATCH] Implement Fiber#raise
> https://bugs.ruby-lang.org/issues/10344#change-49483
>
> * Author: Knut Franke
> * Status: Open
> * Priority: Normal
> * Assignee:
> * Category:
> * Target version:
> ----------------------------------------
> While it is possible to implement this in pure Ruby (by wrapping
> Fiber.yield and Fiber#resume), this feels like a low-level feature that
> ought to be provided out of the box. Also, the C implementation is more
> straight-forward, and more efficient. Unfortunately, it is not quite
> possible to implement this as a C extension module (without resorting to
> wrappers again); cf. the change to make_passing_arg().
>
> Example usage:
>
> ~~~
> fib = Fiber.new do
>   counter = 0
>   loop { counter += Fiber.yield }
>   counter
> end
> fib.resume
> fib.resume 10
> fib.resume 100
> fib.raise StopIteration # => 110
> ~~~
>
> ---Files--------------------------------
> 0001-Implement-Fiber-raise.patch (4.12 KB)
>
>
> --
> https://bugs.ruby-lang.org/
>