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unlink shm frames when camera is removed

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This commit is contained in:
Josh Hawkins 2026-05-21 17:10:32 -05:00
parent a4a592b4e6
commit c2c5c9496e
1 changed files with 20 additions and 0 deletions
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20
frigate/camera/maintainer.py
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@ -202,6 +202,25 @@ class CameraMaintainer(threading.Thread):
capture_process.terminate() capture_process.terminate()
capture_process.join() capture_process.join()
def __unlink_camera_frame_slots(self, camera: str) -> None:
"""Drop the camera's per-frame YUV SHM segments from this
process's frame_manager and unlink them at the OS level.
Safe to call after the camera's capture/processor subprocesses
have been joined — they no longer hold mappings, so unlink frees
the segments immediately. Other long-lived processes that opened
these slots will continue using their existing mappings until
they call frame_manager.get with a shape that no longer fits
(the get path drops and reopens stale refs).
"""
prefix = f"{camera}_frame"
names = [n for n in list(self.frame_manager.shm_store) if n.startswith(prefix)]
for name in names:
try:
self.frame_manager.delete(name)
except Exception as exc:
logger.debug("Could not unlink SHM %s: %s", name, exc)
def __stop_camera_process(self, camera: str) -> None: def __stop_camera_process(self, camera: str) -> None:
camera_process = self.camera_processes.get(camera) camera_process = self.camera_processes.get(camera)
if camera_process is not None: if camera_process is not None:
@ -253,6 +272,7 @@ class CameraMaintainer(threading.Thread):
for camera in updated_cameras: for camera in updated_cameras:
self.__stop_camera_capture_process(camera) self.__stop_camera_capture_process(camera)
self.__stop_camera_process(camera) self.__stop_camera_process(camera)
self.__unlink_camera_frame_slots(camera)
self.capture_processes.pop(camera, None) self.capture_processes.pop(camera, None)
self.camera_processes.pop(camera, None) self.camera_processes.pop(camera, None)
self.camera_stop_events.pop(camera, None) self.camera_stop_events.pop(camera, None)