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: thread.rb
    path of file: ./repos/fluentd/lib/fluent/plugin_helper
    
    the code of the file until where you have to start completion: #
# Fluentd
#
#    Licensed under the Apache License, Version 2.0 (the "License");
#    you may not use this file except in compliance with the License.
#    You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writi
    
      def stop
        super
        wakeup_threads = []
        @_threads_mutex.synchronize do
          @_threads.each_value do |thread|
            thread[:_fluentd_plugin_helper_thread_running] = false
            wakeup_threads << thread if thread.alive? && thread.status == "sleep"
          end
        end
        wakeup_threads.each do |thread|
          if thread.alive?
            thread.wakeup
          end
        end