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gh-112075: Add gc shared bits #114931

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Merged

DinoV merged 2 commits into python:main from DinoV:nogil_dict_gc_shared

Feb 5, 2024

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gh-112075: Add gc shared bits #114931

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GC shared doc and tweak

DinoV Feb 3, 2024

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17 changes: 17 additions & 0 deletions 17 Include/internal/pycore_gc.h

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Original file line number	Diff line number	Diff line change
Expand Up		@@ -43,6 +43,7 @@ static inline PyObject* _Py_FROM_GC(PyGC_Head *gc) {
		# define _PyGC_BITS_FINALIZED (2)
		# define _PyGC_BITS_UNREACHABLE (4)
		# define _PyGC_BITS_FROZEN (8)
		# define _PyGC_BITS_SHARED (16)
		#endif

		/* True if the object is currently tracked by the GC. */
Expand All		@@ -68,6 +69,22 @@ static inline int _PyObject_GC_MAY_BE_TRACKED(PyObject *obj) {
		return 1;
		}

		#ifdef Py_GIL_DISABLED

		/* True if an object is shared between multiple threads and
		* needs special purpose when freeing to do the possibility
		* of in-flight lock-free reads occuring */
		static inline int _PyObject_GC_IS_SHARED(PyObject *op) {
Comment thread DinoV marked this conversation as resolved. Resolved Uh oh! There was an error while loading. Please reload this page.
		return (op->ob_gc_bits & _PyGC_BITS_SHARED) != 0;
		}
		#define _PyObject_GC_IS_SHARED(op) _PyObject_GC_IS_SHARED(_Py_CAST(PyObject*, op))

		static inline void _PyObject_GC_SET_SHARED(PyObject *op) {
		op->ob_gc_bits \|= _PyGC_BITS_SHARED;
		}
		#define _PyObject_GC_SET_SHARED(op) _PyObject_GC_SET_SHARED(_Py_CAST(PyObject*, op))

		#endif

		/* Bit flags for _gc_prev */
		/* Bit 0 is set when tp_finalize is called */
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