Remove unnecessary asyncio EventLoopPolicy init_watcher backport (hom…

…e-assistant#129628)

homeassistant/runner.py

@@ -3,10 +3,8 @@
 from __future__ import annotations
 
 import asyncio
-from asyncio import events
 import dataclasses
 import logging
-import os
 import subprocess
 import threading
 from time import monotonic
@@ -58,46 +56,13 @@ class RuntimeConfig:
     safe_mode: bool = False
 
 
-def can_use_pidfd() -> bool:
-    """Check if pidfd_open is available.
-
-    Back ported from cpython 3.12
-    """
-    if not hasattr(os, "pidfd_open"):
-        return False
-    try:
-        pid = os.getpid()
-        os.close(os.pidfd_open(pid, 0))
-    except OSError:
-        # blocked by security policy like SECCOMP
-        return False
-    return True
-
-
 class HassEventLoopPolicy(asyncio.DefaultEventLoopPolicy):
     """Event loop policy for Home Assistant."""
 
     def __init__(self, debug: bool) -> None:
         """Init the event loop policy."""
         super().__init__()
         self.debug = debug
-        self._watcher: asyncio.AbstractChildWatcher | None = None
-
-    def _init_watcher(self) -> None:
-        """Initialize the watcher for child processes.
-
-        Back ported from cpython 3.12
-        """
-        with events._lock:  # type: ignore[attr-defined] # noqa: SLF001
-            if self._watcher is None:  # pragma: no branch
-                if can_use_pidfd():
-                    self._watcher = asyncio.PidfdChildWatcher()
-                else:
-                    self._watcher = asyncio.ThreadedChildWatcher()
-                if threading.current_thread() is threading.main_thread():
-                    self._watcher.attach_loop(
-                        self._local._loop  # type: ignore[attr-defined] # noqa: SLF001
-                    )
 
     @property
     def loop_name(self) -> str: