消息队列递归实现进程间通信demo

很高兴为您解答这个问题。消息队列是一种常用的进程间通信方式。它可以使不同进程之间通过消息传递来通信。递归实现进程间通信的原理是，在消息队列内部将消息作为一个树形结构进行组织，每个节点代表一条消息，每个节点中包含消息、发送方进程ID、接收方进程ID等信息。这样，当一个进程发送消息时，消息将通过递归方式到达消息队列尾部，并被追加到树形结构的最底层；当一个进程接收消息时，它将从头部开始遍历这个树形结构，寻找合适的消息。下面是一个简单的消息队列递归实现进程间通信的demo，可以供您参考：

import queue

class MsgNode:
    def __init__(self, msg, sender, receiver):
        self.msg = msg
        self.sender = sender
        self.receiver = receiver
        self.children = []

def send_msg(msg, sender, receiver, msg_queue):
    if not msg_queue:
        msg_queue.append(MsgNode(msg, sender, receiver))
    else:
        _send_msg(msg, sender, receiver, msg_queue[0])

def _send_msg(msg, sender, receiver, node):
    if node.receiver == receiver:
        node.children.append(MsgNode(msg, sender, receiver))
    else:
        for child in node.children:
            _send_msg(msg, sender, receiver, child)

def receive_msg(receiver, msg_queue):
    if not msg_queue:
        return None
    else:
        msg_node = _receive_msg(receiver, msg_queue[0])
        if msg_node:
            msg_queue[0].children.remove(msg_node)
            return msg_node.msg

def _receive_msg(receiver, node):
    if node.receiver == receiver:
        if node.children:
            return node.children[0]
        else:
            return node
    else:
        for child in node.children:
            msg_node = _receive_msg(receiver, child)
            if msg_node:
                return msg_node
        return None

# 示例代码
msg_queue = []
send_msg("Hello, World!", "P1", "P2", msg_queue)
send_msg("How are you?", "P2", "P1", msg_queue)
print(receive_msg("P1", msg_queue))
print(receive_msg("P1", msg_queue))

以上是本人提供的示例代码，仅供参考。如果您有任何疑问或者需要进一步的帮助，欢迎继续追问。