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cpython/Modules/_weakref.c at 3.3 · python/cpython · GitHub
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_weakref.c
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#include
"Python.h"
#define
GET_WEAKREFS_LISTPTR
(
o
) \
((PyWeakReference **) PyObject_GET_WEAKREFS_LISTPTR(o))
PyDoc_STRVAR
(
weakref_getweakrefcount__doc__
,
"getweakrefcount(object) -- return the number of weak references\n"
"to 'object'."
);
static
PyObject
*
weakref_getweakrefcount
(
PyObject
*
self
,
PyObject
*
object
)
{
PyObject
*
result
=
NULL
;
if
(
PyType_SUPPORTS_WEAKREFS
(
Py_TYPE
(
object
))) {
PyWeakReference
*
*
list
=
GET_WEAKREFS_LISTPTR
(
object
);
result
=
PyLong_FromSsize_t
(
_PyWeakref_GetWeakrefCount
(
*
list
));
}
else
result
=
PyLong_FromLong
(
0
);
return
result
;
}
PyDoc_STRVAR
(
weakref_getweakrefs__doc__
,
"getweakrefs(object) -- return a list of all weak reference objects\n"
"that point to 'object'."
);
static
PyObject
*
weakref_getweakrefs
(
PyObject
*
self
,
PyObject
*
object
)
{
PyObject
*
result
=
NULL
;
if
(
PyType_SUPPORTS_WEAKREFS
(
Py_TYPE
(
object
))) {
PyWeakReference
*
*
list
=
GET_WEAKREFS_LISTPTR
(
object
);
Py_ssize_t
count
=
_PyWeakref_GetWeakrefCount
(
*
list
);
result
=
PyList_New
(
count
);
if
(
result
!=
NULL
) {
PyWeakReference
*
current
=
*
list
;
Py_ssize_t
i
;
for
(
i
=
0
;
i
<
count
;
++
i
) {
PyList_SET_ITEM
(
result
,
i
, (
PyObject
*
)
current
);
Py_INCREF
(
current
);
current
=
current
->
wr_next
;
}
}
}
else
{
result
=
PyList_New
(
0
);
}
return
result
;
}
PyDoc_STRVAR
(
weakref_proxy__doc__
,
"proxy(object[, callback]) -- create a proxy object that weakly\n"
"references 'object'. 'callback', if given, is called with a\n"
"reference to the proxy when 'object' is about to be finalized."
);
static
PyObject
*
weakref_proxy
(
PyObject
*
self
,
PyObject
*
args
)
{
PyObject
*
object
;
PyObject
*
callback
=
NULL
;
PyObject
*
result
=
NULL
;
if
(
PyArg_UnpackTuple
(
args
,
"proxy"
,
1
,
2
,
&
object
,
&
callback
)) {
result
=
PyWeakref_NewProxy
(
object
,
callback
);
}
return
result
;
}
static
PyMethodDef
weakref_functions
[]
=
{
{
"getweakrefcount"
,
weakref_getweakrefcount
,
METH_O
,
weakref_getweakrefcount__doc__
},
{
"getweakrefs"
,
weakref_getweakrefs
,
METH_O
,
weakref_getweakrefs__doc__
},
{
"proxy"
,
weakref_proxy
,
METH_VARARGS
,
weakref_proxy__doc__
},
{
NULL
,
NULL
,
0
,
NULL
}
};
static
struct
PyModuleDef
weakrefmodule
=
{
PyModuleDef_HEAD_INIT
,
"_weakref"
,
"Weak-reference support module."
,
-1
,
weakref_functions
,
NULL
,
NULL
,
NULL
,
NULL
};
PyMODINIT_FUNC
PyInit__weakref
(
void
)
{
PyObject
*
m
;
m
=
PyModule_Create
(
&
weakrefmodule
);
if
(
m
!=
NULL
) {
Py_INCREF
(
&
_PyWeakref_RefType
);
PyModule_AddObject
(
m
,
"ref"
,
(
PyObject
*
)
&
_PyWeakref_RefType
);
Py_INCREF
(
&
_PyWeakref_RefType
);
PyModule_AddObject
(
m
,
"ReferenceType"
,
(
PyObject
*
)
&
_PyWeakref_RefType
);
Py_INCREF
(
&
_PyWeakref_ProxyType
);
PyModule_AddObject
(
m
,
"ProxyType"
,
(
PyObject
*
)
&
_PyWeakref_ProxyType
);
Py_INCREF
(
&
_PyWeakref_CallableProxyType
);
PyModule_AddObject
(
m
,
"CallableProxyType"
,
(
PyObject
*
)
&
_PyWeakref_CallableProxyType
);
}
return
m
;
}
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