Test for two threads accessing the same array, one thread iterating and the other appending.

gistfile1.rb

iterations = 0
payloads = (1..1000).to_a
threads = []

threads << Thread.new do
  200.times do
    add_num = rand(1000..2000)
    puts "\nAdding #{add_num} to payload"
    payloads << add_num
  end
end

threads << Thread.new do
  payloads.each do |p|
    iterations += 1
    puts "Payload: #{p}"
  end
end

threads.each(&:join)

puts "\n---"
puts "Iterations: #{iterations}"
puts "Final payload length: #{payloads.length}"