1 files changed, 16 insertions, 0 deletions
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index 07b5c6b..1371424 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -709,6 +709,19 @@ mmap__exit__method(PyObject *self, PyObject *args)
     return _PyObject_CallMethodId(self, &PyId_close, NULL);
 }
 
+#ifdef MS_WINDOWS
+static PyObject *
+mmap__sizeof__method(mmap_object *self, void *unused)
+{
+    Py_ssize_t res;
+
+    res = sizeof(mmap_object);
+    if (self->tagname)
+        res += strlen(self->tagname) + 1;
+    return PyLong_FromSsize_t(res);
+}
+#endif
+
 static struct PyMethodDef mmap_object_methods[] = {
     {"close",           (PyCFunction) mmap_close_method,        METH_NOARGS},
     {"find",            (PyCFunction) mmap_find_method,         METH_VARARGS},
@@ -726,6 +739,9 @@ static struct PyMethodDef mmap_object_methods[] = {
     {"write_byte",      (PyCFunction) mmap_write_byte_method,   METH_VARARGS},
     {"__enter__",       (PyCFunction) mmap__enter__method,      METH_NOARGS},
     {"__exit__",        (PyCFunction) mmap__exit__method,       METH_VARARGS},
+#ifdef MS_WINDOWS
+    {"__sizeof__",      (PyCFunction) mmap__sizeof__method,     METH_NOARGS},
+#endif
     {NULL,         NULL}       /* sentinel */
 };