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threadtree: fix memory leak from thread ident reuse in pools #21

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threadtree: fix memory leak from thread ident reuse in pools #21

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13 changes: 8 additions & 5 deletions easypy/threadtree.py
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Original file line number Diff line number Diff line change
Expand Up @@ -88,19 +88,22 @@ def start_new_thread(target, *args, **kwargs):

def wrapper(*args, **kwargs):
thread = threading.current_thread()
child_uuid = get_thread_uuid(thread)
registry_key = (parent_uuid, child_uuid)

if not DISABLE_ACROSS_THREADS:
_FRAME_SNAPSHOTS_REGISTRY[parent_thread.uuid, thread.uuid] = create_frame_snapshot(parent_frame, parent_thread)
uuid = get_thread_uuid(thread)
UUIDS_TREE[uuid] = parent_uuid
_FRAME_SNAPSHOTS_REGISTRY[registry_key] = create_frame_snapshot(parent_frame, parent_thread)

UUIDS_TREE[child_uuid] = parent_uuid
if _REGISTER_GREENLETS:
IDENT_TO_GREENLET[thread.ident] = gevent.getcurrent()
try:
return target(*args, **kwargs)
finally:
# remove the snapshot connecting parent → this thread
_FRAME_SNAPSHOTS_REGISTRY.pop((parent_thread.uuid, thread.uuid), None)
_FRAME_SNAPSHOTS_REGISTRY.pop(registry_key, None)

IDENT_TO_UUID.pop(thread.ident)
IDENT_TO_UUID.pop(thread.ident, None)
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@koreno koreno Mar 1, 2026

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Why was this added?


return _orig_start_new_thread(wrapper, *args, **kwargs)

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