mfourcade

  fiber = Fiber.new do # Thread.current locals are copied to the Fiber when fiber it is built
    puts "1. #{Thread.current[:test]}" 
    Thread.current[:test] = false # the fiber has it's own stack, won't leak away
    puts "2. #{Thread.current[:test]}"
  end

  Thread.current[:test] = true
  fiber.resume

  puts "3. #{Thread.current[:test]}"

  1. 
  2. false
  3. true