From: Jeff Shantz <rubyforum@...>
Date: 2009-05-14T18:58:06+09:00
Subject: Re: Monitor Error when Joining Threads

I realize this is an old question, but I'm replying in case anyone else 
encounters this error, since I just found the fix to it.

You need to make a call to super() in your constructor.

So, the following:

> class StatsTracker < Monitor
>   include Singleton
>   ...
>   def foo
>     synchronize do
>       # do something
>     end
>   end
>   ...
> end

should be changed to:

 class StatsTracker < Monitor
 include Singleton

   def initialize
     super()
   end

   def foo
     synchronize do
       # do something
     end
   end
   ...
 end

The same is true if you're using MonitorMixin.  For instance,

class StatsTracker
 include Singleton
 include MonitorMixin

   def initialize
     super()
   end

   def foo
     synchronize do
       # do something
     end
   end
   ...
 end

Hope that helps someone.
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