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gh-117376: Partial implementation of deferred reference counting (#117696)

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This marks objects as using deferred refrence counting using the
`ob_gc_bits` field in the free-threaded build and collects those objects
during GC.
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Sam Gross 2024-04-12 13:36:20 -04:00 • committed by GitHub
parent c50cb6dd09
commit 4ad8f090cc
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9 changed files with 82 additions and 21 deletions
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15
Include/internal/pycore_object.h
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@ -158,6 +158,21 @@ static inline void _Py_ClearImmortal(PyObject *op)
op = NULL; \
} while (0)
// Mark an object as supporting deferred reference counting. This is a no-op
// in the default (with GIL) build. Objects that use deferred reference
// counting should be tracked by the GC so that they are eventually collected.
extern void _PyObject_SetDeferredRefcount(PyObject *op);
static inline int
_PyObject_HasDeferredRefcount(PyObject *op)
{
#ifdef Py_GIL_DISABLED
return (op->ob_gc_bits & _PyGC_BITS_DEFERRED) != 0;
#else
return 0;
#endif
}
#if !defined(Py_GIL_DISABLED)
static inline void
_Py_DECREF_SPECIALIZED(PyObject *op, const destructor destruct)