Keep track of parent thread when spawning new thread

gistfile1.rb

class Thread

  def self.spawn(*args, &block)
    new(Thread.current, *args) do |*args|
      Thread.current[:parent] = args.first
      block.call(*args[1..-1])
    end
  end

  singleton_class.class_eval{ private :new }

end

puts "Main: #{Thread.main}"

thread1 = Thread.spawn do
  puts "Thread1: #{Thread.current}"
  puts "Thread1:parent #{Thread.current[:parent]}"

  thread2 = Thread.spawn("test") do |s|
    puts "Thread2(#{s}): #{Thread.current}"
    puts "Thread2:parent #{Thread.current[:parent]}"
  end
  
  thread2.join
end

thread1.join