import threading
import time
import random

def tareaUno():
  global Done
  time.sleep(abs(random.gauss(mu=0.0, sigma=1.0)))
  if not Done:
     print("Tarea realizada")
     time.sleep(0.12)
     Done = True
  else :
     print ("tarea NO REALIZADA")
     time.sleep(0.05)
     return
  

def desactivar():
   global Done
   while True:
      time.sleep(abs(random.gauss(mu=0.0, sigma=1.0))) 
      if Done:
         Done = False  
         print("Desactivo")

      if all(not t.is_alive() for t in hilos):
         break

Done = False
hilos = list()
for i in range(50):
  t = threading.Thread(target=tareaUno)
  hilos.append(t)
  t.start()

desbloqueo_thread = threading.Thread(target=desactivar)
desbloqueo_thread.start()