warning.rb

module WarnMultipleBeforeForks
  def self.extended(base)
    base.class_eval do
      alias_method_chain :before_fork, :multiple_warning
      alias_method_chain :after_fork, :multiple_warning
    end
  end

  def before_fork_with_multiple_warning(*args, &block)
    if block_given?
      @before_fork_with_multiple_warning_count ||= 0
      @before_fork_with_multiple_warning_count += 1
      
      count = @before_fork_with_multiple_warning_count
      if count > 1
        Rails.logger.warn "Warning: Resque#before_fork has had #{count} calls. This is bad!"
        Rails.logger.warn caller.backtrace.to_s
      end
    end
    
    before_fork_without_multiple_warning(*args, &block)    
  end
  
  def after_fork_with_multiple_warning(*args, &block)
    if block_given?
      @after_fork_with_multiple_warning_count ||= 0
      @after_fork_with_multiple_warning_count += 1
    
      count = @after_fork_with_multiple_warning_count
      if count > 1
        Rails.logger.warn "Warning: Resque#after_fork has had #{count} calls. This is bad!"
        Rails.logger.warn caller.backtrace.to_s
      end
    end
  end
end