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gh-112075: Support freeing object memory via QSBR (#116344)

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Free objects with qsbr if shared
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Dino Viehland 2024-03-08 09:56:36 -08:00 • committed by GitHub
parent 61831585b6
commit 7db871e4fa
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4 changed files with 68 additions and 13 deletions
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27
Include/internal/pycore_gc.h
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@ -44,6 +44,7 @@ static inline PyObject* _Py_FROM_GC(PyGC_Head *gc) {
# define _PyGC_BITS_UNREACHABLE (4)
# define _PyGC_BITS_FROZEN (8)
# define _PyGC_BITS_SHARED (16)
# define _PyGC_BITS_SHARED_INLINE (32)
#endif
/* True if the object is currently tracked by the GC. */
@ -71,9 +72,12 @@ static inline int _PyObject_GC_MAY_BE_TRACKED(PyObject *obj) {
#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 occurring */
/* True if memory the object references is shared between
* multiple threads and needs special purpose when freeing
* those references due to the possibility of in-flight
* lock-free reads occurring. The object is responsible
* for calling _PyMem_FreeDelayed on the referenced
* memory. */
static inline int _PyObject_GC_IS_SHARED(PyObject *op) {
return (op->ob_gc_bits & _PyGC_BITS_SHARED) != 0;
}
@ -84,6 +88,23 @@ static inline void _PyObject_GC_SET_SHARED(PyObject *op) {
}
#define _PyObject_GC_SET_SHARED(op) _PyObject_GC_SET_SHARED(_Py_CAST(PyObject*, op))
/* True if the memory of the object is shared between multiple
* threads and needs special purpose when freeing due to
* the possibility of in-flight lock-free reads occurring.
* Objects with this bit that are GC objects will automatically
* delay-freed by PyObject_GC_Del. */
static inline int _PyObject_GC_IS_SHARED_INLINE(PyObject *op) {
return (op->ob_gc_bits & _PyGC_BITS_SHARED_INLINE) != 0;
}
#define _PyObject_GC_IS_SHARED_INLINE(op) \
_PyObject_GC_IS_SHARED_INLINE(_Py_CAST(PyObject*, op))
static inline void _PyObject_GC_SET_SHARED_INLINE(PyObject *op) {
op->ob_gc_bits |= _PyGC_BITS_SHARED_INLINE;
}
#define _PyObject_GC_SET_SHARED_INLINE(op) \
_PyObject_GC_SET_SHARED_INLINE(_Py_CAST(PyObject*, op))
#endif
/* Bit flags for _gc_prev */

3
Include/internal/pycore_pymem.h
View file

@ -119,6 +119,9 @@ extern int _PyMem_DebugEnabled(void);
// Enqueue a pointer to be freed possibly after some delay.
extern void _PyMem_FreeDelayed(void *ptr);
// Enqueue an object to be freed possibly after some delay
extern void _PyObject_FreeDelayed(void *ptr);
// Periodically process delayed free requests.
extern void _PyMem_ProcessDelayed(PyThreadState *tstate);