Same as https://gist.github.com/mrkplt/7993228 except it spins up threads to do things in.

threads_and_signals.rb

@hello = 'Hello'
puts Process.pid

thread_array = Array.new

thread_array << Thread.new do
  Signal.trap('USR1'){
    @hello = 'HALLO!'
  }
  Signal.trap('USR2'){
    @hello = 'Hello'
  }
  Signal.trap('INT'){
    puts "\n#{thread_array.size}"
    print 'Exiting...'
    exit
  }
end

thread_array << Thread.new do 
  while true
    print @hello 
    sleep 1 
  end
end

thread_array.each {|t| t.join}