import threading

import time

total = 4

def create_items_1():

global total

for i in range(10):

time.sleep(2)

print('creator1 add item')

total += 1

print("create_item_1 is done")

def create_items_2():

global total

for i in range(7):

time.sleep(2)

print('creator2 add item')

total += 1

print("create_item_2 is done")

def limit_items():

global total

while True:

if total > 5:

print('overload')

total -= 3

print('subtracted 3')

else:

time.sleep(1)

print('waiting')

creator1 = threading.Thread(target=create_items_1)

creator2 = threading.Thread(target=create_items_2)

limitor = threading.Thread(target=limit_items, daemon=True)

creator1.start()

creator2.start()

limitor.start()

creator1.join()

creator2.join()