cpython/Modules/_weakref.c

#include "Python.h"
#include "pycore_dict.h"              // _PyDict_DelItemIf()
#include "pycore_object.h"            // _PyObject_GET_WEAKREFS_LISTPTR()
#include "pycore_weakref.h"           // _PyWeakref_IS_DEAD()

#define GET_WEAKREFS_LISTPTR(o) …

/*[clinic input]
module _weakref
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=ffec73b85846596d]*/

#include "clinic/_weakref.c.h"

/*[clinic input]
_weakref.getweakrefcount -> Py_ssize_t

  object: object
  /

Return the number of weak references to 'object'.
[clinic start generated code]*/

static Py_ssize_t
_weakref_getweakrefcount_impl(PyObject *module, PyObject *object)
/*[clinic end generated code: output=301806d59558ff3e input=7d4d04fcaccf64d5]*/
{ … }


static int
is_dead_weakref(PyObject *value, void *unused)
{ … }

/*[clinic input]

_weakref._remove_dead_weakref -> object

  dct: object(subclass_of='&PyDict_Type')
  key: object
  /

Atomically remove key from dict if it points to a dead weakref.
[clinic start generated code]*/

static PyObject *
_weakref__remove_dead_weakref_impl(PyObject *module, PyObject *dct,
                                   PyObject *key)
/*[clinic end generated code: output=d9ff53061fcb875c input=19fc91f257f96a1d]*/
{ … }


/*[clinic input]
_weakref.getweakrefs
    object: object
    /

Return a list of all weak reference objects pointing to 'object'.
[clinic start generated code]*/

static PyObject *
_weakref_getweakrefs(PyObject *module, PyObject *object)
/*[clinic end generated code: output=25c7731d8e011824 input=00c6d0e5d3206693]*/
{ … }


/*[clinic input]

_weakref.proxy
    object: object
    callback: object(c_default="NULL") = None
    /

Create a proxy object that weakly references 'object'.

'callback', if given, is called with a reference to the
proxy when 'object' is about to be finalized.
[clinic start generated code]*/

static PyObject *
_weakref_proxy_impl(PyObject *module, PyObject *object, PyObject *callback)
/*[clinic end generated code: output=d68fa4ad9ea40519 input=4808adf22fd137e7]*/
{ … }


static PyMethodDef
weakref_functions[] = …;

static int
weakref_exec(PyObject *module)
{ … }

static struct PyModuleDef_Slot weakref_slots[] = …;

static struct PyModuleDef weakrefmodule = …;

PyMODINIT_FUNC
PyInit__weakref(void)
{ … }