From: Brian Candler <b.candler@...>
Date: 2010-04-07T23:45:22+09:00
Subject: Re: modifying a Hash in one process when .each is running in another

Nathan Macinnes wrote:
> Thanks for the clarification... My application is network based, and
> some operations take several seconds. generate_list_of_objects takes
> anything between 2 and 15 seconds, so I wouldn't like to have my whole
> program on hold while that's happening. Each test process takes a few
> seconds too, so if the object is no longer on the list, it isn't a
> particularly bad thing if test tries to run, but it'll take up a lot
> of time unnecessarily.

Let's say generate_list_objects takes 15 seconds, and the test suite 
(iterating the objects) takes 60 seconds. Do you really want 
generate_list_objects to run 4 times uselessly while the test suite runs 
the original set of tests?

Similarly, if the test suite takes 15 seconds and generate_list_objects 
takes 60 seconds, do you want to run the test suite 4 times identically 
with the first set of objects?

If not, but rather you want to run the test suite exactly once for each 
set of data, then you should synchronize them. How about this 
(untested):

require 'thread'
cmd = Queue.new
res = Queue.new
tester = Thread.new do
  while myHash = cmd.pop
    myHash.each { ... }
    res.push [myHash, :ok]
  end
end

q.push MyClass.generate_list_of_objects
while Time.now < time_to_finish
  q.push MyClass.generate_list_of_objects
  res.pop
end
res.pop
q.push nil
tester.wait
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