https://github.com/python/cpython/commit/666795ae34ccb912127d47fd091dcf5513dff94c
commit: 666795ae34ccb912127d47fd091dcf5513dff94c
branch: 3.13
author: Eric Snow <ericsnowcurren...@gmail.com>
committer: ericsnowcurrently <ericsnowcurren...@gmail.com>
date: 2025-06-23T19:38:41Z
summary:
[3.13] gh-135698: Fix Cross-interpreter Queue.full() With Negative/Default
max_size (gh-135778)
We weren't handling non-positive maxsize values (including the default) properly
in Queue.full(). This change fixes that and adjusts an associated assert.
(cherry picked from commit c5ea8e8, AKA gh-135724)
files:
M Lib/test/test_interpreters/test_queues.py
M Modules/_interpqueuesmodule.c
diff --git a/Lib/test/test_interpreters/test_queues.py
b/Lib/test/test_interpreters/test_queues.py
index cbe0d8caffdefa..7858c4e602ce2b 100644
--- a/Lib/test/test_interpreters/test_queues.py
+++ b/Lib/test/test_interpreters/test_queues.py
@@ -209,18 +209,64 @@ def test_empty(self):
self.assertIs(after, True)
def test_full(self):
- expected = [False, False, False, True, False, False, False]
- actual = []
- queue = queues.create(3)
- for _ in range(3):
- actual.append(queue.full())
- queue.put(None, syncobj=True)
- actual.append(queue.full())
- for _ in range(3):
- queue.get()
- actual.append(queue.full())
+ for maxsize in [1, 3, 11]:
+ with self.subTest(f'maxsize={maxsize}'):
+ num_to_add = maxsize
+ expected = [False] * (num_to_add * 2 + 3)
+ expected[maxsize] = True
+ expected[maxsize + 1] = True
+
+ queue = queues.create(maxsize)
+ actual = []
+ empty = [queue.empty()]
+
+ for _ in range(num_to_add):
+ actual.append(queue.full())
+ queue.put_nowait(None)
+ actual.append(queue.full())
+ with self.assertRaises(queues.QueueFull):
+ queue.put_nowait(None)
+ empty.append(queue.empty())
+
+ for _ in range(num_to_add):
+ actual.append(queue.full())
+ queue.get_nowait()
+ actual.append(queue.full())
+ with self.assertRaises(queues.QueueEmpty):
+ queue.get_nowait()
+ actual.append(queue.full())
+ empty.append(queue.empty())
- self.assertEqual(actual, expected)
+ self.assertEqual(actual, expected)
+ self.assertEqual(empty, [True, False, True])
+
+ # no max size
+ for args in [(), (0,), (-1,), (-10,)]:
+ with self.subTest(f'maxsize={args[0]}' if args else '<default>'):
+ num_to_add = 13
+ expected = [False] * (num_to_add * 2 + 3)
+
+ queue = queues.create(*args)
+ actual = []
+ empty = [queue.empty()]
+
+ for _ in range(num_to_add):
+ actual.append(queue.full())
+ queue.put_nowait(None)
+ actual.append(queue.full())
+ empty.append(queue.empty())
+
+ for _ in range(num_to_add):
+ actual.append(queue.full())
+ queue.get_nowait()
+ actual.append(queue.full())
+ with self.assertRaises(queues.QueueEmpty):
+ queue.get_nowait()
+ actual.append(queue.full())
+ empty.append(queue.empty())
+
+ self.assertEqual(actual, expected)
+ self.assertEqual(empty, [True, False, True])
def test_qsize(self):
expected = [0, 1, 2, 3, 2, 3, 2, 1, 0, 1, 0]
diff --git a/Modules/_interpqueuesmodule.c b/Modules/_interpqueuesmodule.c
index 73f80fe3a1ef9b..6f050a988b1426 100644
--- a/Modules/_interpqueuesmodule.c
+++ b/Modules/_interpqueuesmodule.c
@@ -718,8 +718,11 @@ _queue_is_full(_queue *queue, int *p_is_full)
return err;
}
- assert(queue->items.count <= queue->items.maxsize);
- *p_is_full = queue->items.count == queue->items.maxsize;
+ assert(queue->items.maxsize <= 0
+ || queue->items.count <= queue->items.maxsize);
+ *p_is_full = queue->items.maxsize > 0
+ ? queue->items.count == queue->items.maxsize
+ : 0;
_queue_unlock(queue);
return 0;
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