写入UDP套接字是否可以阻止? [英] Can writing to a UDP socket ever block?

问题描述

如果是这样，在什么条件下?或者，换句话说，在twisted内运行此代码是否安全:

And if so, under what conditions? Or, phrased alternately, is it safe to run this code inside of twisted:

class StatsdClient(AbstractStatsdClient):
  def __init__(self, host, port):
    super(StatsdClient, self).__init__()
    self.addr = (host, port)
    self.server_hostname = socket.gethostname()
    self.udp_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

  def incr(self, stat, amount=1):
    data = {"%s|c" % stat: amount}
    self._send(data)

  def _send(self, data):
    for stat, value in data.iteritems():
      self.udp_sock.sendto("servers.%s.%s:%s" % (self.server_hostname, stat, value), self.addr)

推荐答案

是的，奇怪的是，UDP套接字会阻塞.

Yes, oddly, a UDP socket can block.

基本上可以发生这种情况的条件是，某些地方的缓冲区已满，您的操作系统决定是时候该阻止某些东西了.这些可以说是内核错误，但我在这里和那里都已经看到过.有时在晦涩，无法复制的条件下，您肯定会得到EWOULDBLOCK.

The conditions under which this can happen are basically, some buffers somewhere fill up, your operating system decides it's time for something to block. These are arguably kernel bugs, but I've seen them here and there. You can definitely get EWOULDBLOCK sometimes under obscure, impossible-to-reproduce conditions.

您为什么要在Twisted中执行此操作，而不是使用Twisted的内置UDP支持虽然?

Why would you want to do this in Twisted instead of using Twisted's built-in UDP support though?

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