问题描述
这是我尝试使用 high-level asyncio subprocess APIs 过早终止子进程的程序:
import asyncio
async def test():
process = await asyncio.create_subprocess_shell(
"sleep 2 && echo done",stdout=asyncio.subprocess.PIPE,)
await asyncio.sleep(1)
process.kill()
await process.wait()
# process._transport.close()
asyncio.run(test())
$ python3.9 test.py
Exception ignored in: <function BaseSubprocesstransport.__del__ at 0x1065f0dc0>
Traceback (most recent call last):
File "/usr/local/Cellar/python@3.9/3.9.2_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/asyncio/base_subprocess.py",line 126,in __del__
self.close()
File "/usr/local/Cellar/python@3.9/3.9.2_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/asyncio/base_subprocess.py",line 104,in close
proto.pipe.close()
File "/usr/local/Cellar/python@3.9/3.9.2_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/asyncio/unix_events.py",line 536,in close
self._close(None)
File "/usr/local/Cellar/python@3.9/3.9.2_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/asyncio/unix_events.py",line 560,in _close
self._loop.call_soon(self._call_connection_lost,exc)
File "/usr/local/Cellar/python@3.9/3.9.2_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/asyncio/base_events.py",line 746,in call_soon
self._check_closed()
File "/usr/local/Cellar/python@3.9/3.9.2_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/asyncio/base_events.py",line 510,in _check_closed
raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed
如果我取消注释 # process._transport.close()
或注释 asyncio.sleep(1)
,错误就会消失。 (我在 python 3.8 中得到了相同的行为。我没有尝试过其他 python 版本。)
问题:
- 为什么我需要明确关闭
Subprocesstransport
? - 是否可以使用高级 API 干净地终止子进程而无需访问受保护成员
process._transport
?还是我被迫使用 low-level API?
解决方法
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