gvl.rb

#!/usr/bin/env ruby

require 'fiddle/import'

module GVLUnlock
  extend ::Fiddle::Importer
  dlload ::Fiddle::Handle::DEFAULT
  FP = 
    bind 'void *cb(void *data)' do |ptr|
      ptr.to_i << 1
    end
      
  extern 'void * rb_thread_call_without_gvl(void *(*func)(void *data), void *data1,
			    rb_unblock_function_t *ubf, void *data2)'

  def self.run fp
    rb_thread_call_without_gvl(FP, 0, 0, 0).to_value
  end
end

def foo
  10.times { puts ":)" }
end


p GVLUnlock.run foo