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Fix CF high memory usage: clean up timers and file descriptors

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Resolved resident memory growth during long-running idle sessions.
Fixes: https://github.com/00dani/mpd-now-playable/issues/3

The CoreFoundation asyncio bridge was leaking native resources over time.
This change explicitly invalidates one-shot CFRunLoop timers after execution,
invalidates timers on cancellation, and invalidates CFFileDescriptor objects
when unregistering the final callback source.
This commit is contained in:
Götz 2026-02-28 16:50:15 -05:00
parent 413df0979d
commit 14717b4866
1 changed files with 17 additions and 6 deletions
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23
src/corefoundationasyncio/eventloop.py
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@ -1,7 +1,7 @@
# -*- coding: utf-8 -*-
# Copied from https://github.com/alberthier/corefoundationasyncio/blob/5061b9b7daa8bcd40d54d58432d84dcc0a339ca6/corefoundationasyncio.py
# This module is copied, rather than simply installed, because the PyPI version of this module depends on *all* of PyObjC even though it only needs pyobjc-framework-Cocoa.
# There's an open PR to fix this: httpsV//github.com/alberthier/corefoundationasyncio/pull/3
# There's an open PR to fix this: https://github.com/alberthier/corefoundationasyncio/pull/3
import asyncio
@ -10,8 +10,8 @@ import threading
from CoreFoundation import (
CFRunLoopGetCurrent,
CFRunLoopTimerCreate, CFRunLoopAddTimer, CFRunLoopRemoveTimer, CFAbsoluteTimeGetCurrent,
CFFileDescriptorCreate, CFFileDescriptorIsValid, CFFileDescriptorEnableCallBacks, CFFileDescriptorDisableCallBacks,
CFRunLoopTimerCreate, CFRunLoopAddTimer, CFRunLoopRemoveTimer, CFRunLoopTimerInvalidate, CFAbsoluteTimeGetCurrent,
CFFileDescriptorCreate, CFFileDescriptorIsValid, CFFileDescriptorEnableCallBacks, CFFileDescriptorDisableCallBacks, CFFileDescriptorInvalidate,
CFFileDescriptorCreateRunLoopSource, CFRunLoopAddSource, CFRunLoopRemoveSource,
kCFAllocatorDefault, kCFRunLoopDefaultMode, kCFRunLoopCommonModes,
kCFFileDescriptorReadCallBack, kCFFileDescriptorWriteCallBack
@ -106,8 +106,15 @@ class CoreFoundationEventLoop(asyncio.SelectorEventLoop):
if handle.cancelled():
return
def ontimeout(cf_timer, info):
if not handle.cancelled():
handle._run()
try:
if not handle.cancelled():
handle._run()
finally:
# Explicitly invalidate/remove one-shot timers. Relying on
# implicit cleanup can leak CoreFoundation timer objects under
# long-running loads.
CFRunLoopRemoveTimer(self._runloop, cf_timer, kCFRunLoopCommonModes)
CFRunLoopTimerInvalidate(cf_timer)
when = handle.when() if is_timer else self.time()
cf_timer = CFRunLoopTimerCreate(kCFAllocatorDefault, when, 0, 0, 0, ontimeout, None)
CFRunLoopAddTimer(self._runloop, cf_timer, kCFRunLoopCommonModes)
@ -116,7 +123,10 @@ class CoreFoundationEventLoop(asyncio.SelectorEventLoop):
handle._scheduled = True
def _timer_handle_cancelled(self, handle):
CFRunLoopRemoveTimer(self._runloop, handle.cf_runloop_timer, kCFRunLoopCommonModes)
if handle.cf_runloop_timer is not None:
CFRunLoopRemoveTimer(self._runloop, handle.cf_runloop_timer, kCFRunLoopCommonModes)
CFRunLoopTimerInvalidate(handle.cf_runloop_timer)
handle.cf_runloop_timer = None
def time(self):
return CFAbsoluteTimeGetCurrent()
@ -161,6 +171,7 @@ class CoreFoundationEventLoop(asyncio.SelectorEventLoop):
CFFileDescriptorDisableCallBacks(entry.cf_fd, event)
else:
CFRunLoopRemoveSource(self._runloop, entry.cf_source, kCFRunLoopDefaultMode)
CFFileDescriptorInvalidate(entry.cf_fd)
return True
def _add_reader(self, fd, callback, *args):