154 lines
3.9 KiB
C
154 lines
3.9 KiB
C
#include "Python.h"
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#define GET_WEAKREFS_LISTPTR(o) \
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((PyWeakReference **) PyObject_GET_WEAKREFS_LISTPTR(o))
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/*[clinic]
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module _weakref
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_weakref.getweakrefcount -> Py_ssize_t
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object: object
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/
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Return the number of weak references to 'object'.
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[clinic]*/
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PyDoc_STRVAR(_weakref_getweakrefcount__doc__,
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"Return the number of weak references to \'object\'.\n"
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"\n"
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"_weakref.getweakrefcount(object)");
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#define _WEAKREF_GETWEAKREFCOUNT_METHODDEF \
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{"getweakrefcount", (PyCFunction)_weakref_getweakrefcount, METH_O, _weakref_getweakrefcount__doc__},
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static Py_ssize_t
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_weakref_getweakrefcount_impl(PyObject *module, PyObject *object);
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static PyObject *
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_weakref_getweakrefcount(PyObject *module, PyObject *object)
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{
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PyObject *return_value = NULL;
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Py_ssize_t _return_value;
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_return_value = _weakref_getweakrefcount_impl(module, object);
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if ((_return_value == -1) && PyErr_Occurred())
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goto exit;
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return_value = PyLong_FromSsize_t(_return_value);
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exit:
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return return_value;
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}
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static Py_ssize_t
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_weakref_getweakrefcount_impl(PyObject *module, PyObject *object)
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/*[clinic checksum: 05cffbc3a4b193a0b7e645da81be281748704f69]*/
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{
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PyWeakReference **list;
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if (!PyType_SUPPORTS_WEAKREFS(Py_TYPE(object)))
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return 0;
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list = GET_WEAKREFS_LISTPTR(object);
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return _PyWeakref_GetWeakrefCount(*list);
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}
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PyDoc_STRVAR(weakref_getweakrefs__doc__,
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"getweakrefs(object) -- return a list of all weak reference objects\n"
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"that point to 'object'.");
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static PyObject *
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weakref_getweakrefs(PyObject *self, PyObject *object)
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{
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PyObject *result = NULL;
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if (PyType_SUPPORTS_WEAKREFS(Py_TYPE(object))) {
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PyWeakReference **list = GET_WEAKREFS_LISTPTR(object);
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Py_ssize_t count = _PyWeakref_GetWeakrefCount(*list);
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result = PyList_New(count);
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if (result != NULL) {
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PyWeakReference *current = *list;
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Py_ssize_t i;
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for (i = 0; i < count; ++i) {
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PyList_SET_ITEM(result, i, (PyObject *) current);
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Py_INCREF(current);
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current = current->wr_next;
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}
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}
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}
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else {
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result = PyList_New(0);
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}
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return result;
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}
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PyDoc_STRVAR(weakref_proxy__doc__,
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"proxy(object[, callback]) -- create a proxy object that weakly\n"
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"references 'object'. 'callback', if given, is called with a\n"
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"reference to the proxy when 'object' is about to be finalized.");
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static PyObject *
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weakref_proxy(PyObject *self, PyObject *args)
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{
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PyObject *object;
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PyObject *callback = NULL;
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PyObject *result = NULL;
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if (PyArg_UnpackTuple(args, "proxy", 1, 2, &object, &callback)) {
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result = PyWeakref_NewProxy(object, callback);
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}
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return result;
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}
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static PyMethodDef
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weakref_functions[] = {
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_WEAKREF_GETWEAKREFCOUNT_METHODDEF
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{"getweakrefs", weakref_getweakrefs, METH_O,
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weakref_getweakrefs__doc__},
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{"proxy", weakref_proxy, METH_VARARGS,
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weakref_proxy__doc__},
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{NULL, NULL, 0, NULL}
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};
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static struct PyModuleDef weakrefmodule = {
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PyModuleDef_HEAD_INIT,
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"_weakref",
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"Weak-reference support module.",
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-1,
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weakref_functions,
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NULL,
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NULL,
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NULL,
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NULL
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};
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PyMODINIT_FUNC
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PyInit__weakref(void)
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{
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PyObject *m;
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m = PyModule_Create(&weakrefmodule);
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if (m != NULL) {
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Py_INCREF(&_PyWeakref_RefType);
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PyModule_AddObject(m, "ref",
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(PyObject *) &_PyWeakref_RefType);
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Py_INCREF(&_PyWeakref_RefType);
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PyModule_AddObject(m, "ReferenceType",
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(PyObject *) &_PyWeakref_RefType);
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Py_INCREF(&_PyWeakref_ProxyType);
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PyModule_AddObject(m, "ProxyType",
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(PyObject *) &_PyWeakref_ProxyType);
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Py_INCREF(&_PyWeakref_CallableProxyType);
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PyModule_AddObject(m, "CallableProxyType",
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(PyObject *) &_PyWeakref_CallableProxyType);
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}
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return m;
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}
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