mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-07-12 13:55:34 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 14

gh-117783: Immortalize objects that use deferred reference counting (#118112)

Browse source 
Deferred reference counting is not fully implemented yet. As a temporary
measure, we immortalize objects that would use deferred reference
counting to avoid multi-threaded scaling bottlenecks.

This is only performed in the free-threaded build once the first
non-main thread is started. Additionally, some tests, including refleak
tests, suppress this behavior.
This commit is contained in:
Sam Gross 2024-04-29 14:36:02 -04:00 • committed by GitHub
parent 8d4b756fd3
commit 7ccacb220d
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
13 changed files with 134 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

7
Objects/object.c
View file

@ -2430,6 +2430,13 @@ _PyObject_SetDeferredRefcount(PyObject *op)
assert(PyType_IS_GC(Py_TYPE(op)));
assert(_Py_IsOwnedByCurrentThread(op));
assert(op->ob_ref_shared == 0);
PyInterpreterState *interp = _PyInterpreterState_GET();
if (interp->gc.immortalize.enabled) {
// gh-117696: immortalize objects instead of using deferred reference
// counting for now.
_Py_SetImmortal(op);
return;
}
op->ob_gc_bits |= _PyGC_BITS_DEFERRED;
op->ob_ref_local += 1;
op->ob_ref_shared = _Py_REF_QUEUED;