带有超时的python多线程连接 [英] python multi-thread join with timeout

问题描述

似乎，如果您有一个n个线程的循环并以超时t一次将它们连接起来，则实际花费的时间为n * t，因为开始计数一个子线程的超时是最后一个线程的结束时间子线程.有什么办法可以将总时间减少到t not n * t?

It seems that if you have a loop of n threads and join them one by one with the timeout t， the actual time you take is n * t because the beginning to count timeout of one child thread is the ending time of last child thread. Is there any way to reduce this total time to t not n*t?

推荐答案

是的，您可以计算绝对超时，并在每次加入之前重新计算剩余的相对超时:

Yes, you can calculate an absolute timeout, and recompute your remaining relative timeout before every join:

# Join the_threads, waiting no more than some_relative_timeout to
# attempt to join all of them.

absolute_timeout = time.time() + some_relative_timeout

for thr in the_threads:
  timeout = absolute_timeout - time.time()
  if timeout < 0:
    break
  thr.join(timeout)
  if thr.isAlive():
    # we timed out
  else:
    # we didn't

现在，您是否*应该*这样做有点不透明.最好让守护程序"工作线程通过其他方式传达其完成情况:全局状态表，将完成"消息推送到队列等.

Now, whether or not you *should* do this is a bit opaque. It may be better to have "daemon" worker threads communicate their completion by other means: a global state table, pushes of "done" messages to a queue, etc.

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