import random
import threading
import time
def synchronize(func):
def lock_resource(*args, **kwargs):
global lock
lock.acquire()
try:
func(*args, **kwargs)
finally:
lock.release()
return lock_resource
@synchronize
def count_up(num):
global database
time.sleep(random.randrange(3))
database.append(num)
def main():
global database, lock
lock = threading.Lock()
database = []
threads = []
for i in range(15):
threads.append(threading.Thread(target=count_up, args=(i+1,)))
threads[i].start()
for th in threads:
th.join()
print(database)
if __name__ == '__main__':
main()