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问题描述
我了解队列和堆栈之间的区别.但是,如果我生成多个进程并在它们之间发送消息放入 multiprocessing.Queue
我如何首先访问放入队列中的最新元素?
I understand the difference between a queue and stack. But if I spawn multiple processes and send messages between them put in multiprocessing.Queue
how do I access the latest element put in the queue first?
推荐答案
你可以使用 多处理管理器 来包装 队列.LifoQueue
做你想做的事.
You can use a multiprocessing manager to wrap a queue.LifoQueue
to do what you want.
from multiprocessing import Process
from multiprocessing.managers import BaseManager
from time import sleep
from queue import LifoQueue
def run(lifo):
"""Wait for three messages and print them out"""
num_msgs = 0
while num_msgs < 3:
# get next message or wait until one is available
s = lifo.get()
print(s)
num_msgs += 1
# create manager that knows how to create and manage LifoQueues
class MyManager(BaseManager):
pass
MyManager.register('LifoQueue', LifoQueue)
if __name__ == "__main__":
manager = MyManager()
manager.start()
lifo = manager.LifoQueue()
lifo.put("first")
lifo.put("second")
# expected order is "second", "first", "third"
p = Process(target=run, args=[lifo])
p.start()
# wait for lifoqueue to be emptied
sleep(0.25)
lifo.put("third")
p.join()
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