Question

我最好从代码中开始提问。

from multiprocessing import Process, Event, Queue
from threading import Timer
from Queue import Empty

class MyServer(Process):
    def __init__(self, port, queue):
        Process.__init__(self)

        self.port = port
        self.queue = queue
        self.sd = None

    def run(self):
        try:
            self.start_serving()

        except KeyboardInterrupt:
            print("Shutting down..")

        finally:
            if self.sd is not None:
                self.sd.close()

    def start_serving(self):
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        self.sd = s
        try:
            s.bind(('', self.port))
            s.listen(1)
            while True:
                conn, addr = s.accept()
                while True:
                    # I dont want to bore you with excess code
                    # just recv data from clients
                    try:
                        msg = self.queue.get_nowait()
                        # here i start Timer with delay from message (I'll describe Message class below)
                        Timer(msg.delay, self.response_handler, args=(conn, msg)).start()
                    except Empty:
                        pass
                conn.close()

        finally:
            s.close()

    def response_handler(self, sd, msg):
        # doesn't matter
        # and now I want to terminate the MyServer instance
        if msg.terminate:
            # the problem is here. Lets call it 'problem line'
            sys.exit()

msg是Message类的实例，它是：

class Message(object):
    def __init__(self, port, delay, values, terminate=False):
        self.port = port
        self.delay = delay
        self.values = values
        self.terminate = terminate

逻辑是我通过TCP连接从客户端获取数据并检查队列中的消息。消息是控制服务器的东西。有时候我会收到“等待3秒并终止服务器”的消息。到目前为止我做了什么。

在self.terminate()致电problem line。我明白了 AttributeError: 'NoneType' object has no attribute 'terminate'
在problem line处提出异常。我假设异常是在run()函数中捕获的。我曾是错
致电sys.exit()。它也不起作用。

也许我的问题可以缩短。如何从Python中的线程终止进程？

Answer 1

为什么不使用multiprocessing.Event（您已经导入它）并在收到终止消息时正常退出流程。

为此，请将其添加到__init__：

self.exit = Event()

并更改两个while循环：

while True:
    conn, addr = s.accept()
    while True:
    #...

到

while not self.exit.is_set():
    conn, addr = s.accept()
    while not self.exit.is_set()
    #...

然后在你的响应处理程序中：

if msg.terminate:
    self.exit.set()

这将允许代码自然地退出循环，确保调用conn.close()。

从Timer线程终止进程

1 个答案: