gistfile1.txt

require "redis"

class Test
  attr_reader :quit

  def initialize
    @redis = Redis.new
  end

  def trap_signal
    trap("INT") {
      puts "get ready to exit"
      @redis.rpush "TestQueue", @elem # I need to be sure that @emelent always puts back in the database 
      @quit = true}
  end

  def run!
    trap_signal
    @elem = "test string"
    @redis.rpush "TestQueue", @elem
    while !quit
      @redis.blpop "TestQueue", @elem
      # Do some work whith @element
      sleep 1
      # And put it back in the database 
      @redis.rpush "TestQueue", @elem
    end
  end

end

Test.new.run!


=begin
Error is:

^Cget ready to exit
/usr/lib/ruby/2.1.0/monitor.rb:185:in `lock': can't be called from trap context (ThreadError)
	from /usr/lib/ruby/2.1.0/monitor.rb:185:in `mon_enter'
	from /usr/lib/ruby/2.1.0/monitor.rb:209:in `mon_synchronize'
	from /home/kusayu/.gem/ruby/2.1.0/gems/redis-3.2.0/lib/redis.rb:37:in `synchronize'
	from /home/kusayu/.gem/ruby/2.1.0/gems/redis-3.2.0/lib/redis.rb:991:in `rpush'
	from test.rb:13:in `block in trap_signal'
	from test.rb:24:in `call'
	from test.rb:24:in `sleep'
	from test.rb:24:in `run!'
	from test.rb:32:in `<main>'


=end