diff --git a/judge/scripts/lib/dir_init.rb b/judge/scripts/lib/dir_init.rb
deleted file mode 100644
--- a/judge/scripts/lib/dir_init.rb
+++ /dev/null
@@ -1,126 +0,0 @@
-require 'ftools'
-
-# DirInit::Manager handles directory initialization and clean-up when
-# there are many concurrent processes that wants to modify the
-# directory in the same way.
-#
-# An example usage is when each process wants to copy some temporary
-# files to the directory and delete these files after finishing its
-# job.  Problems may occur when the first process delete the files
-# while the second process is still using the files.
-#
-# This library maintain a reference counter on the processes using the
-# directory.  It locks the dir to manage critical section when
-# updating the reference counter.
-#
-# Example usage:
-#
-#   dman = DirInit::Manager.new("mydir")
-#
-#   dman.setup do
-#     # do some initialization
-#   end
-#
-#   #... do anything you want
-#
-#   dman.teardown do
-#     # clean up
-#   end
-#
-# DirInit::Manager ensures that the block passed to <tt>setup</tt>
-# only runs once by the first process in the concurrent dir usage and
-# block passed to <tt>teardown</tt> runs once by the last process in
-# that concurrent activities leaving that dir.
-
-module DirInit
-
-  class Manager
-  
-    def initialize(dir_name, usage_filename='.usage_counter')
-      @dir_name = dir_name
-      @usage_filename = usage_filename
-    end
-
-    # Check if someone has initialized the dir.  If not, call block.
-
-    def setup    # :yields: block
-      dir = File.new(@dir_name)
-      dir.flock(File::LOCK_EX)
-      begin
-        counter_filename = get_counter_filename
-        if File.exist? counter_filename
-          # someone is here
-          f = File.new(counter_filename,"r+")
-          counter = f.read.to_i
-          f.seek(0)
-          f.write("#{counter+1}\n")
-          f.close
-        else
-          # i'm the first, create the counter file
-          counter = 0
-          f = File.new(counter_filename,"w")
-          f.write("1\n")
-          f.close
-        end
-        
-        # if no one is here
-        if counter == 0
-          if block_given?
-            yield
-          end
-        end
-        
-      rescue
-        raise
-        
-      ensure
-        # make sure it unlock the directory
-        dir.flock(File::LOCK_UN)
-      end
-    end
-    
-    # Check if I am the last one using the dir.  If true, call block.
-
-    def teardown
-      dir = File.new(@dir_name)
-      dir.flock(File::LOCK_EX)
-      begin
-        counter_filename = get_counter_filename
-        if File.exist? counter_filename
-          # someone is here
-          f = File.new(counter_filename,"r+")
-          counter = f.read.to_i
-          f.seek(0)
-          f.write("#{counter-1}\n")
-          f.close
-          
-          if counter == 1
-            # i'm the last one
-            
-            File.delete(counter_filename)
-            if block_given?
-              yield
-            end
-          end
-        else
-          # This is BAD
-          raise "Error: reference count missing"
-        end
-
-      rescue
-        raise
-
-      ensure
-        # make sure it unlock the directory
-        dir.flock(File::LOCK_UN)
-      end
-    end
-    
-    protected
-
-    def get_counter_filename
-      return File.join(@dir_name,@usage_filename)
-    end
-
-  end
-end