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Backport early-out 91259f061cfb to reduce the cost of bb1a2944bcb6

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Raymond Hettinger 2015-10-06 23:06:17 -04:00
parent 59dc696821
commit 848f2b595d
1 changed files with 5 additions and 1 deletions
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6
Modules/_collectionsmodule.c
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@ -1045,6 +1045,9 @@ deque_clear(dequeobject *deque)
Py_ssize_t n;
PyObject *item;
if (Py_SIZE(deque) == 0)
return;
/* During the process of clearing a deque, decrefs can cause the
deque to mutate. To avoid fatal confusion, we have to make the
deque empty before clearing the blocks and never refer to
@ -1423,7 +1426,8 @@ deque_init(dequeobject *deque, PyObject *args, PyObject *kwdargs)
}
}
deque->maxlen = maxlen;
deque_clear(deque);
if (Py_SIZE(deque) > 0)
deque_clear(deque);
if (iterable != NULL) {
PyObject *rv = deque_extend(deque, iterable);
if (rv == NULL)