python 线程锁 -4

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from atexit import register from random import randrange from threading import Thread, currentThread, Lock, current_thread, active_count from time import ctime, sleep     class CleanOutputSet(set):     def __str__(self):         return ', '.join(x for x in self)     loops = (randrange(2, 5) for x in range(randrange(3, 7))) lock = Lock() remaining = CleanOutputSet()     def loop(nsec):     myname = current_thread().name     # lock.acquire()  # 加锁     with lock:         remaining.add(myname)         print('[%s] Started %s' % (ctime(), myname))         sleep(nsec)         remaining.remove(myname)         print('[%s] Completed %s (%d sece)' % (ctime(), myname, nsec))         print('(remaining: %s)' % (remaining or 'NONE'))     # lock.release()     def main():     for pause in loops:         Thread(target=loop, args=(pause,)).start()         print(pause, 'aaa')   # 程序结束之前调用, exit() 方法调用之前 @register def _atexit():     print(active_count())  # 当前线程数     print('all DONE at:', ctime())     main()