ThreadSync.py

import threading
import time

x = 8192
lock = threading.Lock()

def double():
 global x, lock
 lock.acquire()
 while x < 16384:
 x *= 2
 print(x)
 time.sleep(1)
 print("Reached the maximum!")
 lock.release()

def halve():
 global x, lock
 lock.acquire()
 while x > 1:
 x /=2
 print(x)
 time.sleep(1)
 print("Reached the minimum!")
 lock.release()

t1 = threading.Thread(target=halve)
t2 = threading.Thread(target=double)

t1.start()
t2.start()