play.cr

ch = Channel(Nil).new
alias TH = Thread(Nil, Nil)
threads = Array(TH).new
threads <<  TH.new do
  6.times do
    sleep 1
    puts 1
  end
  ch.send(nil)
  nil
end

threads << TH.new do
  3.times do
    sleep 2
    puts 2
  end
  ch.send(nil)
  nil
end
# sleep
# x.join
# y.join
threads.size
# threads.size.times { ch.receive ; puts "gots" }
ch.receive
ch.receive
# threads.each { |t| t.join }

puts "Done"