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python-3.x - 线程中的服务器（Python3.9.0+aiohttp）：RuntimeError: can't register atexit after shutdown

问题描述

这段代码（在线程中运行的最小服务器，代码取自此处）在 Python3.8.3 中运行良好，但在 Python3.9.0 中引发错误消息：

import asyncio
import threading
from aiohttp import web


def aiohttp_server():
    def say_hello(request):
        return web.Response(text='Hello, world')

    app = web.Application()
    app.add_routes([web.get('/', say_hello)])
    runner = web.AppRunner(app)
    return runner


def run_server(runner):
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    loop.run_until_complete(runner.setup())
    site = web.TCPSite(runner, 'localhost', 8080)
    loop.run_until_complete(site.start())
    loop.run_forever()


t = threading.Thread(target=run_server, args=(aiohttp_server(),))
t.start()

错误信息：

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.9/threading.py", line 954, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.9/threading.py", line 892, in run
    self._target(*self._args, **self._kwargs)
  File "/home/alkhinoos/nikw/nikw/z2.py", line 21, in run_server
    loop.run_until_complete(site.start())
  File "/usr/lib/python3.9/asyncio/base_events.py", line 642, in run_until_complete
    return future.result()
  File "/usr/lib/python3.9/site-packages/aiohttp/web_runner.py", line 121, in start
    self._server = await loop.create_server(
  File "/usr/lib/python3.9/asyncio/base_events.py", line 1460, in create_server
    infos = await tasks.gather(*fs, loop=self)
  File "/usr/lib/python3.9/asyncio/base_events.py", line 1400, in _create_server_getaddrinfo
    infos = await self._ensure_resolved((host, port), family=family,
  File "/usr/lib/python3.9/asyncio/base_events.py", line 1396, in _ensure_resolved
    return await loop.getaddrinfo(host, port, family=family, type=type,
  File "/usr/lib/python3.9/asyncio/base_events.py", line 856, in getaddrinfo
    return await self.run_in_executor(
  File "/usr/lib/python3.9/asyncio/base_events.py", line 809, in run_in_executor
    executor = concurrent.futures.ThreadPoolExecutor(
  File "/usr/lib/python3.9/concurrent/futures/__init__.py", line 49, in __getattr__
    from .thread import ThreadPoolExecutor as te
  File "/usr/lib/python3.9/concurrent/futures/thread.py", line 37, in <module>
    threading._register_atexit(_python_exit)
  File "/usr/lib/python3.9/threading.py", line 1374, in _register_atexit
    raise RuntimeError("can't register atexit after shutdown")
RuntimeError: can't register atexit after shutdown

这是怎么回事 ？Python 3.9.1 也出现了同样的问题。这个问题用 Python 3.9.2 解决了吗？也许这里是一个相对的问题。

标签： python-3.xmultithreadingaiohttp

解决方案

如 Python 手册中所述 -线程对象

其他线程可以调用线程的 join() 方法。这会阻塞调用线程，直到调用 join() 方法的线程终止。

调用t.start()主线程后，主线程将退出。然后该过程结束。

如果你想永远运行子线程或者直到它退出，你应该t.join()在t.start().

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