1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
#include "Python.h"
#define GET_WEAKREFS_LISTPTR(o) \
((PyWeakReference **) PyObject_GET_WEAKREFS_LISTPTR(o))
/*[clinic]
module _weakref
[clinic]*/
/*[clinic checksum: da39a3ee5e6b4b0d3255bfef95601890afd80709]*/
/*[clinic]
_weakref.getweakrefcount -> Py_ssize_t
object: object
/
Return the number of weak references to 'object'.
[clinic]*/
PyDoc_STRVAR(_weakref_getweakrefcount__doc__,
"getweakrefcount(object)\n"
"Return the number of weak references to \'object\'.");
#define _WEAKREF_GETWEAKREFCOUNT_METHODDEF \
{"getweakrefcount", (PyCFunction)_weakref_getweakrefcount, METH_O, _weakref_getweakrefcount__doc__},
static Py_ssize_t
_weakref_getweakrefcount_impl(PyModuleDef *module, PyObject *object);
static PyObject *
_weakref_getweakrefcount(PyModuleDef *module, PyObject *object)
{
PyObject *return_value = NULL;
Py_ssize_t _return_value;
_return_value = _weakref_getweakrefcount_impl(module, object);
if ((_return_value == -1) && PyErr_Occurred())
goto exit;
return_value = PyLong_FromSsize_t(_return_value);
exit:
return return_value;
}
static Py_ssize_t
_weakref_getweakrefcount_impl(PyModuleDef *module, PyObject *object)
/*[clinic checksum: 436e8fbe0297434375f039d8c2d9fc3a9bbe773c]*/
{
PyWeakReference **list;
if (!PyType_SUPPORTS_WEAKREFS(Py_TYPE(object)))
return 0;
list = GET_WEAKREFS_LISTPTR(object);
return _PyWeakref_GetWeakrefCount(*list);
}
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[] = {
_WEAKREF_GETWEAKREFCOUNT_METHODDEF
{"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;
}
|
