From: David Flanagan <david@...>
Date: 2007-08-23T04:22:40+09:00
Subject: Re: Fibers in Ruby 1.9?

My posts to ruby-core have arrived out-of-order today.  By the time this 
message appeared, it was already out of date.  I have tested Fibers 
directly and they do work on Linux.  See 
http://www.davidflanagan.com/blog/2007_08.html#000139

	David

David Flanagan wrote:
> Francis,
> 
> As I understand it, external iterators are implemented on top of fibers. 
>  And external iterators are working for me in Linux.  So the fibers must 
> be working.  (I've posted external iterator examples at
> http://www.davidflanagan.com/blog/2007_08.html#000138 but I haven't 
> figured out the Fiber API yet, so I haven't tested Fibers directly yet.)
> 
> According to Wikipedia's entry on Fibers, they can be implemented in 
> Posix with getcontext,setcontext,swapcontext from ucontext.h.  I don't 
> know anything about it.  I haven't done that kind of low-level hacking 
> since the days of setjmp/longjmp.
> 
> I doesn't look to me, however, as if Ruby's implementation does that. 
> Fibers are in cont.c, along with continuations.  I haven't figured that 
> code out yet, but I'm guessing that they're implemented on top of (or 
> with the same techniques as) Continuations.
> 
>     David