stat

# File lib/rake/thread_pool.rb, line 139
    def stat(event, data=nil) # :nodoc:
      return if @history_start_time.nil?
      info = {
        :event  => event,
        :data   => data,
        :time   => Time.now,
        :thread => Thread.current.object_id,
      }
      @history_mon.synchronize { @history << info }
    end