You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: parser_extras.rb
    path of file: ./repos/nokogiri/lib/nokogiri/css
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require "thread"

module Nokogiri
  module CSS
    c
    
        def clear_cache(create_new_object = false)
          @mutex.synchronize do
            if create_new_object
              @cache = {}
            else
              @cache.clear
            end
          end