Merge pull request #18 from ruby-concurrency/removes-iron-ruby

Removes IronRuby support

Author: lucasallan

README.md

@@ -33,7 +33,7 @@ This library also includes tools for some common uses of weak and soft reference
 
 ## Problems with WeakRef
 
-Ruby does come with the `WeakRef` class in the standard library. However, there are [issues with this class](https://bugs.ruby-lang.org/issues/4168) across several different Ruby runtimes. This gem provides a common interface to weak references that works across MRI, Ruby Enterprise Edition, YARV, Jruby, Rubinius, and IronRuby.
+Ruby does come with the `WeakRef` class in the standard library. However, there are [issues with this class](https://bugs.ruby-lang.org/issues/4168) across several different Ruby runtimes. This gem provides a common interface to weak references that works across MRI, Ruby Enterprise Edition, YARV, JRuby and Rubinius.
 
 1. MRI and REE 1.8 - `WeakRef` extends from Delegator which is a very heavy weight class under Ruby 1.8. Creating a `WeakRef` object will allocate thousands of other objects and use up hundreds of kilobytes of memory. This makes `WeakRef` all but unusable even if you only need several hundred of them.
 2. YARV 1.9 - `WeakRef` is unsafe to use because the garbage collector can run in a different system thread than a thread allocating memory. This exposes a bug where a `WeakRef` may end up pointing to a completely different object than it originally referenced.

lib/ref.rb

@@ -16,10 +16,7 @@ module Ref
     end
   else
     require 'ref/soft_reference'
-    if defined?(RUBY_ENGINE) && RUBY_ENGINE == 'ironruby'
-      # IronRuby has it's own implementation of weak references.
-      require 'ref/weak_reference/iron_ruby'
-    elsif defined?(RUBY_ENGINE) && RUBY_ENGINE == 'rbx'
+    if defined?(RUBY_ENGINE) && RUBY_ENGINE == 'rbx'
       # If using Rubinius set the implementation to use WeakRef since it is very efficient and using finalizers is not.
       require 'ref/weak_reference/weak_ref'
     elsif defined?(::ObjectSpace::WeakMap)

lib/ref/weak_reference/iron_ruby.rb

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
   s.email       = ['[email protected]']
   s.homepage    = "http://github.com/ruby-concurrency/ref"
   s.summary     = "Library that implements weak, soft, and strong references in Ruby."
-  s.description = "Library that implements weak, soft, and strong references in Ruby that work across multiple runtimes (MRI, REE, YARV, Jruby, Rubinius, and IronRuby). Also includes implementation of maps/hashes that use references and a reference queue."
+  s.description = "Library that implements weak, soft, and strong references in Ruby that work across multiple runtimes (MRI, REE, YARV, Jruby and Rubinius). Also includes implementation of maps/hashes that use references and a reference queue."
   s.license     = "MIT"
   s.date        = Time.now.strftime('%Y-%m-%d')
 
@@ -19,7 +19,7 @@ Gem::Specification.new do |s|
   s.files        += Dir['test/**/*.*']
 
   s.require_paths = ['lib']
-  
+
   s.has_rdoc         = true
   s.rdoc_options     = ["--charset=UTF-8", "--main", "README.md"]
   s.extra_rdoc_files = ["README.md"]