From: Robert Klemme <shortcutter@...>
Date: 2006-07-06T22:56:27+09:00
Subject: Re: [BUG] thread/sync.rb memory corruption

Ara, I still believe the error is in the script (see my other posting).

Kind regards

robert

2006/7/6, ara.t.howard@noaa.gov <ara.t.howard@noaa.gov>:
>
> i'm using ef (electric fence) to show the memory corruption in this script.
> to cause it corrupt memory use
>
>    CORRUPT=true ef ruby bug.rb
>
> file: bug.rb
>
>      require 'sync'
>
>      class A
>        def initialize
>          extend Sync_m
>          @observers = []
>        end
>        def meth
>          synchronize(:EX){
>            @observers.each do |o|
>              if ENV['CORRUPT']
>                o.notify nil
>              else
>                o.notify
>              end
>            end
>          }
>        end
>        def add_observer o
>          synchronize(:EX){
>            @observers << o
>          }
>        end
>      end
>
>      class B
>        def initialize a
>          @a = a
>          @a.add_observer self
>        end
>        def notify *a
>          Thread.new{ @a.meth }
>        end
>      end
>
>      a = A.new
>      b = B.new a
>      a.meth
>      STDIN.gets
>
>
> note that it is the simple passing, or not, of arguments to the notify method
> which triggers the bug.  perhaps this will yield some hints.
>
>
> regards.
>
> -a
> --
> suffering increases your inner strength.  also, the wishing for suffering
> makes the suffering disappear.
> - h.h. the 14th dali lama
>
>


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