import threading
import time

numWithLock=1
numWithoutLock=1

lock = threading.RLock()
def addWithLock():
 lock.acquire()
 global numWithLock
 numWithLock +=1
 time.sleep(1)
 lock.release()

def addWithoutLock():
 global numWithoutLock
 numWithoutLock+=1
 time.sleep(1)

threads = []

for i in range(1,20):
 x = threading.Thread(target=addWithLock)
 x.start()
 threads.append(x)

for i in range(1,20):
 t = threading.Thread(target=addWithoutLock)
 t.start()
 threads.append(t)

for i in threads:
 i.join()

print('numWithLock=',numWithLock)
print('numWithoutLock=',numWithoutLock)