class Puma::Reactor

If that value is in the past, then a sleep value of zero is used.

would take for the first element to time out.
Otherwise a sleep value is set that is the same as the amount of time it

comes first in the array. When there are no timeouts the default timeout is used.
The values kept in `@timeouts` are sorted so that the first timeout

sleep for in the main reactor loop when no sockets are being written to.
The `calculate_sleep` sets the value that the `NIO::Selector#select` will

def calculate_sleep
  if @timeouts.empty?
    @sleep_for = DefaultSleepFor
  else
    diff = @timeouts.first.value.timeout_at.to_f - Time.now.to_f
    if diff < 0.0
      @sleep_for = 0
    else
      @sleep_for = diff
    end
  end
end