112 lines
3.1 KiB
C
112 lines
3.1 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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PyDoc_STRVAR(weakref_getweakrefcount__doc__,
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"getweakrefcount(object) -- return the number of weak references\n"
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"to 'object'.");
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static PyObject *
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weakref_getweakrefcount(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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result = PyInt_FromSsize_t(_PyWeakref_GetWeakrefCount(*list));
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}
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else
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result = PyInt_FromLong(0);
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return result;
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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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{"getweakrefcount", weakref_getweakrefcount, METH_O,
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weakref_getweakrefcount__doc__},
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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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PyMODINIT_FUNC
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init_weakref(void)
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{
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PyObject *m;
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m = Py_InitModule3("_weakref", weakref_functions,
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"Weak-reference support module.");
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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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}
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