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: rbx_lockable_object.rb
    path of file: ./repos/stackneveroverflow/vendor/bundle/ruby/2.3.0/gems/concurrent-ruby-1.0.5/lib/concurrent/synchronization
    
    the code of the file until where you have to start completion: module Concurrent
  module Synchronization

    # @!visibility private
    # @!macro internal_imple
    
      def synchronize(&block)
        if @__owner__ == Thread.current
          yield
        else
          result = nil
          Rubinius.synchronize(self) do
            begin
              @__owner__ = Thread.current
              result     = yield
            ensure
              @__owner__ = nil
            end
          end