Wait for delayed job to stop

gistfile1.rb

# Run DelayedJob
namespace :delayed_job do
  def wait_for_process_to_end(process_name)
    run "COUNT=1; until [ $COUNT -eq 0 ]; do COUNT=`ps -ef | grep -v 'ps -ef' | grep -v 'grep' | grep -i '#{process_name}'|wc -l` ; echo 'waiting for #{process_name} to end' ; sleep 2 ; done"
  end
  
  desc "Restart the delayed_job process"
  task :restart, :roles => :app do
    stop
    wait_for_process_to_end('delayed_job')
    start
  end
end