From: Jon <jon.forums@...>
Date: 2010-01-26T03:34:18+09:00
Subject: [ruby-core:27827] Re: [Bug #2619] Proposed method:  Process.fork_supported?

> Thanks but I'm fine. I currently use the following code:
> 
> RUBY_ENGINE = defined?(::RUBY_ENGINE) ? ::RUBY_ENGINE : "ruby"
> def self.fork_supported?
> 	# MRI >= 1.9.2's respond_to? returns false for methods
> 	# that are not implemented.
> 	return Process.respond_to?(:fork) &&
> 		RUBY_ENGINE != "jruby" &&
> 		RUBY_ENGINE != "macruby" &&
> 		Config::CONFIG['target_os'] !~ /mswin|windows/
> end

FYIW, 1.9.1p243 of the RC1 from http://rubyinstaller.org/ does...

C:\Users\Jon\Documents>ruby -e "require 'rbconfig'; puts Config::CONFIG['target_os']"
mingw32