docs: def mainloop(self):
          """ 
          This is the reactor mainloop.
          It is intented to be called when
          a reactor is installed.
  
          from untwisted.network import *
  
          # It processes forever.
          core.gear.mainloop()
          """
              
          while True:
          # It calls repeteadly the reactor
          # update method.
              try:
                  self.update()
              except Kill:
          # It breaks the loop
          # silently.
          # people implementing reactors from other mainloop
          # should implement this try: catch
          # suitably to their needs.
  
                  break
              except KeyboardInterrupt:
                  print(self.base)
                  raise