Question

Here’s a simplified version of some code I wrote:

class InfiniteLoop
  def run
    trap('SIGTERM') do
      puts 'exiting'
      exit
    end
    loop {}
  end
end

If I run:

InfiniteLoop.new.run

I can ctrl+c and get:

exiting

However, when I do this:

t = Thread.new { InfiniteLoop.new.run }
sleep 1
t.terminate

I don’t see:

exiting

Can someone point me in the right direction here? I’d like to have the same behavior when terminating the thread.

Answer 1

If you are not sending a SIGTERM signal (via ctrl+c) the trap block is not executed.
See also the Kernel method:

at_exit { puts 'exiting' }