AR Threads

#$ rails new foo
#$ cd foo
#  <set up config/database.yml to use Postgres with "pool: 1">
#  development:
#    adapter: postgresql
#    encoding: utf8
#    database: foo_development
#    pool: 1
#  <add "gem 'pg'" to Gemfile>
#$ bundle install
#$ rake db:drop; rake db:create; rake db:migrate
#$ rails generate scaffold post title body:text published:boolean
#$ rails c
#  <Do a few Post.create!(title:"hello", body:"world")>
#  <Then...>

finished=[]
1.upto(2) do |i|
  finished[i]="."
  Thread.new do
    puts "THREAD START #{i} #{Thread.current.inspect}"
    1.upto(50) do
      Post.first.reload
      Post.last.reload
    end
    print "THREAD DONE #{i} #{Thread.current.inspect}: "
    finished[i]="*"
    puts finished.join('')
    # COMMENT THIS OUT and only 1 thread gets to finish.
    # LEAVE THIS IN and both threads finish.
    ActiveRecord::Base.connection_pool.disconnect!
  end
  sleep(1)
  puts "COUNT DONE #{i}"
end