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Implement finalizer for os.scandir() iterator 

Issue #26603:

* Implement finalizer for os.scandir() iterator
* Set the source parameter when emitting the ResourceWarning warning
* Close the iterator before emitting the warning
This commit is contained in:
Victor Stinner 2016-03-23 00:43:54 +01:00
parent e19558af1b
commit 7bfa409ff8
1 changed files with 51 additions and 21 deletions
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72
Modules/posixmodule.c
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@ -12100,30 +12100,39 @@ ScandirIterator_exit(ScandirIterator *self, PyObject *args)
Py_RETURN_NONE;
}
static void
ScandirIterator_finalize(ScandirIterator *iterator)
{
PyObject *error_type, *error_value, *error_traceback;
/* Save the current exception, if any. */
PyErr_Fetch(&error_type, &error_value, &error_traceback);
if (!ScandirIterator_is_closed(iterator)) {
ScandirIterator_closedir(iterator);
if (PyErr_ResourceWarning((PyObject *)iterator, 1,
"unclosed scandir iterator %R", iterator)) {
/* Spurious errors can appear at shutdown */
if (PyErr_ExceptionMatches(PyExc_Warning)) {
PyErr_WriteUnraisable((PyObject *) iterator);
}
}
}
Py_CLEAR(iterator->path.object);
path_cleanup(&iterator->path);
/* Restore the saved exception. */
PyErr_Restore(error_type, error_value, error_traceback);
}
static void
ScandirIterator_dealloc(ScandirIterator *iterator)
{
if (!ScandirIterator_is_closed(iterator)) {
PyObject *exc, *val, *tb;
Py_ssize_t old_refcount = Py_REFCNT(iterator);
/* Py_INCREF/Py_DECREF cannot be used, because the refcount is
* likely zero, Py_DECREF would call again the destructor.
*/
++Py_REFCNT(iterator);
PyErr_Fetch(&exc, &val, &tb);
if (PyErr_WarnFormat(PyExc_ResourceWarning, 1,
"unclosed scandir iterator %R", iterator)) {
/* Spurious errors can appear at shutdown */
if (PyErr_ExceptionMatches(PyExc_Warning))
PyErr_WriteUnraisable((PyObject *) iterator);
}
PyErr_Restore(exc, val, tb);
Py_REFCNT(iterator) = old_refcount;
if (PyObject_CallFinalizerFromDealloc((PyObject *)iterator) < 0)
return;
ScandirIterator_closedir(iterator);
}
Py_XDECREF(iterator->path.object);
path_cleanup(&iterator->path);
Py_TYPE(iterator)->tp_free((PyObject *)iterator);
}
@ -12155,7 +12164,8 @@ static PyTypeObject ScandirIteratorType = {
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
Py_TPFLAGS_DEFAULT
| Py_TPFLAGS_HAVE_FINALIZE, /* tp_flags */
0, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
@ -12164,6 +12174,26 @@ static PyTypeObject ScandirIteratorType = {
PyObject_SelfIter, /* tp_iter */
(iternextfunc)ScandirIterator_iternext, /* tp_iternext */
ScandirIterator_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
0, /* tp_new */
0, /* tp_free */
0, /* tp_is_gc */
0, /* tp_bases */
0, /* tp_mro */
0, /* tp_cache */
0, /* tp_subclasses */
0, /* tp_weaklist */
0, /* tp_del */
0, /* tp_version_tag */
(destructor)ScandirIterator_finalize, /* tp_finalize */
};
static PyObject *