# Where is Fiber::Core in Ruby 1.9?

**URL:** <https://www.ruby-forum.com/t/where-is-fiber-core-in-ruby-1-9/129526>\
**Category:** Ruby\
**Created:** [February 19, 2008, 10:30am UTC](https://www.ruby-forum.com/t/where-is-fiber-core-in-ruby-1-9/129526 "2008-02-19T10:30:57Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![pluskid](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/ba8739/32.png) [@pluskid](https://www.ruby-forum.com/u/pluskid)\
**Post date:** [February 19, 2008, 10:30am UTC](https://www.ruby-forum.com/t/where-is-fiber-core-in-ruby-1-9/129526/1 "2008-02-19T10:30:57Z")

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Hi! I found some articles introduce the Fiber in Ruby 1.9. And also  
Fiber::Core as the coroutine support in Ruby. Here’s an example:

require ‘fiber’

f = g = nil

f = Fiber::Core.new { |x|  
puts “F1: #{x}”  
x = g.transfer(x+1)  
puts “F2: #{x}”  
x = g.transfer(x+1)  
puts “F3: #{x}”  
}

g = Fiber::Core.new { |x|  
puts “G1: #{x}”  
x = f.transfer(x+1)  
puts “G2: #{x}”  
x = f.transfer(x+1)  
}

f.transfer(100)

But when I run this example, I got an error:

NameError: uninitialized constant Fiber::Core

I’m using Ruby1.9 package of Debian lenny: Version: 1.9.0.0-2

Is the api changed? Or has Fiber::Core been removed? Thanks!

---

<div class="post-metadata">

**Author:** ![pluskid](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/ba8739/32.png) [@pluskid](https://www.ruby-forum.com/u/pluskid)\
**Post date:** [February 19, 2008, 10:40am UTC](https://www.ruby-forum.com/t/where-is-fiber-core-in-ruby-1-9/129526/2 "2008-02-19T10:40:26Z")

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> > > > > “p” == pluskid [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

p\> f = Fiber::Core.new { |x|

gsub(/::Core/, ‘’)

vgs% cat b.rb  
require ‘fiber’  
f = g = nil

f = Fiber.new { |x|  
puts “F1: #{x}”  
x = g.transfer(x+1)  
puts “F2: #{x}”  
x = g.transfer(x+1)  
puts “F3: #{x}”  
}

g = Fiber.new { |x|  
puts “G1: #{x}”  
x = f.transfer(x+1)  
puts “G2: #{x}”  
x = f.transfer(x+1)  
}

f.transfer(100)  
vgs%

vgs% ./ruby -v b.rb  
ruby 1.9.0 (2008-02-18 revision 15525) [i686-linux]  
F1: 100  
G1: 101  
F2: 102  
G2: 103  
F3: 104  
vgs%

Guy Decoux

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<div class="post-metadata">

**Author:** ![pluskid](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/ba8739/32.png) [@pluskid](https://www.ruby-forum.com/u/pluskid)\
**Post date:** [February 19, 2008, 2:01pm UTC](https://www.ruby-forum.com/t/where-is-fiber-core-in-ruby-1-9/129526/3 "2008-02-19T14:01:23Z")

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Oh! Thanks! So, in the Ruby 1.9 Release. Fiber and Fiber::Core are  
merged.

2008/2/19, ts [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):