threads_for_mac.rb

count = (ARGV.first || 3).to_i
puts "Creating #{count} threads"
threads = count.times.map do |n|
  num = n + 1
  puts "Creating thread #{num}"
  t = Thread.new do
    loop do
      puts "Thread #{num}"
      sleep rand(2..5)
    end
  end
end


t2 = Thread.new do
  loop do
    puts %{sudo dtruss -ap #{Process.pid} 2>&1 | sed -e "s/:.*//g"}
    sleep 1
  end
end
(threads + [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