From: "Jan E." <lists@...>
Date: 2012-11-28T01:20:36+09:00
Subject: Re: why this behaves like singleton

Hi,

a class variable (in your case @@locks) is shared among the class and 
all instances of the class -- as well as all subclasses and their 
instances. So when g1 or g2 do something with @@locks, it's always the 
same array.

I think you generally misunderstand the difference between the various 
types of variables. For example, the variable @lock in @lock = 0 is 
completely different from the one you use in the initialize method, and 
in your case it's simply useless. Ruby is not Java where this syntax is 
used to set default values.

So you might wanna read up on this topic:
http://en.wikibooks.org/wiki/Ruby_Programming/Syntax/Classes

You should generally avoid class variables unless you really know what 
you're doing. Use instance variables or class instance variables 
depending on the specific purpose.

To fix your code, replace @@locks with an instance variable and set it 
in the correct context:

----------------------------
class Locks
  def initialize ( rd )
  @locks = []
    rd.each do |k|
      @locks << Lock.new(rd)
  end
end

  def printLocks
    @locks.each do |l|
      puts l.glock()
        end
  end
end
----------------------------

-- 
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