ruby simple event loop with ctrl-c handling

loop.rb

#!/usr/bin/ruby

require 'date'

# see also https://github.com/socketry/nio4r

last = Time.now.utc
stop = false

trap("SIGINT") do
  puts "caught sigint"
  stop |= true
end

n = 0
loop do
  loop_time = Time.now.utc
  n += 1
  if loop_time - last > 1
    puts "#{loop_time} #{n} stop = #{stop}"
    last = loop_time
    if stop # odd place for this - it's to demonstrate ctrl-c doesn't immediately exit
      break
    end
  else
    sleep(0.1) # anything faster than this caused noticeable cpu
  end

end