multithreading - Ruby doesn't execute the code of all threads -

i'm learning how use threads in ruby i've found strange problem. that's code:

require 'active_record' require 'rss' require 'open-uri' require 'thread' require_relative 'model/post' require_relative 'model/source'  queue = queue.new producer = []  activerecord::base.establish_connection(     adapter: "postgresql",     host: "localhost",     database: "trendy",     username: "postgres",     password: "postgres" )  sources = source.all puts "active record has loaded: #{sources.length} feeds" sources.each |source|   producer << thread.new     puts "feed: #{source.url}"   end end  producer.join  puts "number of threads created #{producer.length}" 

and that's output:

active record has loaded: 5 feeds feed: http://alt1040.com/feed feed: http://appleweblog.com/feednumber of threads created 5  process finished exit code 0 

if run again, find out program doesn't print 2 feeds, mean, number of feeds program prints random.

i can't see problem...

you're not waiting them complete. need call producer.each(&:join). producer.join calling join on array