From: "Iñaki Baz Castillo" <ibc@...>
Date: 2009-02-04T21:39:45+09:00
Subject: Using a Class (not an instance) into threads

Hi, i'm using Ragel parser generating Ruby code. The generated code
uses a Class instead of an instance, and that class has lots of
attributes and methods. Something like:

--------------
class MyParser

    class << self
        attr_accessor :_machine_trans_keys
        private :_machine_trans_keys, :_machine_trans_keys=
    end

  self._machine_trans_keys = [
        0, 0, 9, 34, 10, 10,
        9, 32, 9, 34, -64,
        126, -128, -65, -128, -65,
        -128, -65, -128, -65, -128, -65,
        10, 10, 9, 32, 13,
        13, 10, 10, 0, 127,
        0, 0, 0
    ]

  ...
  ...

  def self.run_machine(data)
      ...
  end

end
-------------


So I wonder how could I use this class into a threaded program. AFAIK
a singleton class is the Class itself, so if a running thread modifies
some singleton attribute then all the other threads will see that
change (error!!!).

Am I right? How could I achieve it?


Thanks a lot.



-- 
Iñaki Baz Castillo
<ibc@aliax.net>