lazy scheduler - missing cron jobs

require 'rubygems'
require 'rufus-scheduler'

# the following example should poll every 5s
# and trigger a job at seconds 0,10,20,30,40,50
# but no jobs ever fire unless we are very lucky with our timing

scheduler = Rufus::Scheduler::PlainScheduler.start_new(:frequency => 5.0)
scheduler.cron "0,10,20,30,40,50 * 0-59 * * *" do
  puts "doing something #{Time.now}"
end