require 'monitor'

Module.class_eval do
  def synchronize_method *methods        
    methods.each do |method|     
      raise "can't synchronize system method #{method}" if method =~ /^__/
      
      als = "sync_#{escape_method(method)}".to_sym
      
      raise "can't synchronize the '#{method}' twice!" if instance_methods.include?(als)
      
      alias_method als, method
      script = "\
def #{method} *p, &b
  @monitor ||= Monitor.new
  @monitor.synchronize{#{als} *p, &b}
end"
      class_eval script, __FILE__, __LINE__
    end
  end
  
  def synchronize_all_methods include_super = false
    methods = self.instance_methods(include_super).collect{|m| m}
    synchronize_method *methods
  end
end