cpython/Include/internal/pycore_weakref.h

#ifndef Py_INTERNAL_WEAKREF_H
#define Py_INTERNAL_WEAKREF_H
#ifdef __cplusplus
extern "C" {
#endif

#ifndef Py_BUILD_CORE
#  error "this header requires Py_BUILD_CORE define"
#endif

#include "pycore_critical_section.h" // Py_BEGIN_CRITICAL_SECTION()
#include "pycore_lock.h"
#include "pycore_object.h"           // _Py_REF_IS_MERGED()
#include "pycore_pyatomic_ft_wrappers.h"

#ifdef Py_GIL_DISABLED

#define WEAKREF_LIST_LOCK …

// Lock using the referenced object
#define LOCK_WEAKREFS …
#define UNLOCK_WEAKREFS …

// Lock using a weakref
#define LOCK_WEAKREFS_FOR_WR …
#define UNLOCK_WEAKREFS_FOR_WR …

#else

#define LOCK_WEAKREFS(obj) …
#define UNLOCK_WEAKREFS(obj) …

#define LOCK_WEAKREFS_FOR_WR(wr) …
#define UNLOCK_WEAKREFS_FOR_WR(wr) …

#endif

static inline int _is_dead(PyObject *obj)
{ … }

static inline PyObject* _PyWeakref_GET_REF(PyObject *ref_obj)
{ … }

static inline int _PyWeakref_IS_DEAD(PyObject *ref_obj)
{ … }

extern Py_ssize_t _PyWeakref_GetWeakrefCount(PyObject *obj);

// Clear all the weak references to obj but leave their callbacks uncalled and
// intact.
extern void _PyWeakref_ClearWeakRefsNoCallbacks(PyObject *obj);

PyAPI_FUNC(int) _PyWeakref_IsDead(PyObject *weakref);

#ifdef __cplusplus
}
#endif
#endif /* !Py_INTERNAL_WEAKREF_H */