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gh-135698: Fix _interpqueues.create(): max_size >= 0 #135703

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gh-135698: Fix _interpqueues.create(): max_size >= 0 #135703

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8 changes: 6 additions & 2 deletions Lib/test/test_interpreters/test_queues.py
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,10 @@ def test_create_destroy(self):
with self.assertRaises(queues.QueueNotFoundError):
_queues.destroy(qid)

with self.assertRaises(ValueError):
# gh-135698: max_size must be greater than or equal to 0
_queues.create(-1, 1, 1)

def test_not_destroyed(self):
# It should have cleaned up any remaining queues.
stdout, stderr = self.assert_python_ok(
Expand Down Expand Up @@ -114,8 +118,8 @@ def test_create(self):
self.assertEqual(queue.maxsize, 0)

with self.subTest('negative maxsize'):
queue = queues.create(-10)
self.assertEqual(queue.maxsize, -10)
with self.assertRaises(ValueError):
queues.create(-10)

with self.subTest('bad maxsize'):
with self.assertRaises(TypeError):
Expand Down
5 changes: 5 additions & 0 deletions Modules/_interpqueuesmodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1488,6 +1488,11 @@ queuesmod_create(PyObject *self, PyObject *args, PyObject *kwds)
{
return NULL;
}
if (maxsize < 0) {
PyErr_SetString(PyExc_ValueError,
"max_size must be greater than or equal to 0");
return NULL;
}
Comment on lines +1491 to +1495
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@ericsnowcurrently ericsnowcurrently Jun 19, 2025 •
edited
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A negative value is fine. That's the same as queue.Queue. The logic (and the assert) in _queue_is_full() is actually wrong. I'll put up a PR.

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See gh-135724.

struct _queuedefaults defaults = {0};
if (resolve_unboundop(unboundarg, UNBOUND_REPLACE,
&defaults.unboundop) < 0)
Expand Down
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