Waiting for deferred actions to finish

[alex0375@gmail.com]

Hello!

I would like the Rainbows! to wait for deferred actions to finish
before shutdown. The documentation says the following:

> QUIT - graceful shutdown, waits for workers to finish their current request before finishing. This currently does not wait for requests deferred to a separate thread when using EventMachine (when app.deferred?(env) => true)
>
> https://bogomips.org/rainbows/SIGNALS.html

I came up with the following solution:

after_fork do |_server, _worker|
  # Wait for all deferred actions to finish before killing worker.
  Rainbows.at_quit do
    loop do
      break if EventMachine.defers_finished?

      sleep 1
    end
  end
end

Am I missing something? Can this be a part of Rainbows?

Thanks!