Show Ruby Native Threads

threads.rb

t = Thread.new do
  loop do
    puts "Thread 1"
    sleep rand(3)
  end
end

t1 = Thread.new do
  loop do
    puts "\tThread 2"
    sleep rand(3)
  end
end

t2 = Thread.new do
  loop do
    puts "Check for 3 native threads\n\t$ ps -T -p #{Process.pid}"
    sleep 1
  end
end
[t, t1, t2].each(&:join)

#  PID  SPID TTY          TIME CMD
# 11947 11947 pts/1    00:00:00 ruby
# 11947 11975 pts/1    00:00:00 ruby-timer-thr
# 11947 11976 pts/1    00:00:00 threads.rb:1
# 11947 11977 pts/1    00:00:00 threads.rb:8
# 11947 11978 pts/1    00:00:00 threads.rb:15