class Faraday::Adapter::EMSynchrony::ParallelManager

def run

it in a reactor and fiber if needed.
Run all requests on queue with `EM::Synchrony::Multi`, wrapping 
def run
  result = nil
  if !EM.reactor_running?
    EM.run {
      Fiber.new do
        result = perform
        EM.stop
      end.resume
    }
  else
    result = perform
  end
  result
end