From: Aldric Giacomoni <aldric@...>
Date: 2009-12-16T04:32:40+09:00
Subject: Using threads to show progress

I want to do this in a Rake task, but the concept is Ruby. I would like
to use one thread to do the work, and one thread to periodically tell me
"We're working on element x now". I'm trying to work from this page:
http://ruby-doc.org/docs/ProgrammingRuby/html/tut_threads.html
Here is basically what I have:

    dictated_exams = DictatedExam.all
    enumerate = Thread.new do
      dictated_exams.each do |exam|
        Thread.current[:id] = exam.id
      end
    end
    print = Thread.new do
      sleep 1
      puts enumerate[:id]
    end
  end

... And I'm pretty much stuck here. I -think- what I want to do is
create a thread which won't end until after the main one ends, and loop
forever ?
Or maybe I want to repeatedly create a new thread which will print the
:id, then exit, until the 'enumerate' thread is done ?
I realize that I could do this in one process, without threads, but I
want to update the output, say, every second, instead of with every
element.
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