Python线程：在while语句中锁定

Question

我正在使用 Python 学习多线程。我的任务是排队系统。这是我的代码：

lock = thread.allocate_lock()
while len(Queue)>0: 
   lock.acquire()

   # get item from Queue
   item =  Queue[0, :]
   Queue = np.delete(Queue,  0, 0)

   lock.release()

   # process item
   # some code here

问题是队列在检查长度并应用锁后可能会被修改。

所以我需要类似的东西（这显然不是有效的代码）：

while lock.acquire(), len(Queue)>0:   # not working
   item =  Queue[0, :]
   Queue = np.delete(Queue,  0, 0)

   lock.release()

如何最好地解决这个问题？

Answer 1

这个呢？

    lock = thread.allocate_lock()
    while true: 
       lock.acquire()
       if len(Queue) <= 0:
         lock.release()
         break

       # get item from Queue
       item =  Queue[0, :]
       Queue = np.delete(Queue,  0, 0)

       lock.release()

       # process item
       # some code here