From: Bryan Richardson <btrichardson@...>
Date: 2008-07-26T00:44:09+09:00
Subject: Monitor Error when Joining Threads

Hello all,

*Note: this may get published twice... I posted via the email list but
it never went through...*

I'm getting the following error when I I try to join some threads:

c:/ruby/lib/ruby/1.8/monitor.rb:215:in `mon_enter': undefined method `+'
for nil:NilClass (NoMethodError)
    from simulator2.rb:48:in `join'
    from simulator2.rb:48:in `init'
    from simulator2.rb:48:in `each'
    from simulator2.rb:48:in `init'
    from simulator2.rb:163

For some reason @mon_count within monitor.rb is nil, but I'm not sure
why any type of synchronization is being done at this point.  Does
Thread do some synchronization when join is called?

Below is the code from simulator2.rb on line 48 (along with other
potentially informative code):

threads = Array.new
outages.each do |range|
  @logger.debug "New thread -- Start: #{range.first}, Finish:
#{range.last}"
  threads << Thread.new do
    Simulator2.new(@file, @interface,
"c:\log-#{threads.length}.txt").run(range.first, range.last)
  end
end
threads.each { |thread| thread.join }

I am doing some synchronization of methods and variables within the
Simulator2#run method... but would this show up as coming from the
Thread#join method?

Just for clarification, yes I am creating a new instance of Simulator2
(which is the class which this code resides in).  The code above resides
in Simulator2#init.

--
Thanks!
Bryan
-- 
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