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53 lines
1.7 KiB
Python
53 lines
1.7 KiB
Python
# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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import gc
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import signal
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import sys
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import weakref
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import pytest
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from pyarrow import util
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from pyarrow.tests.util import disabled_gc
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def exhibit_signal_refcycle():
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# Put an object in the frame locals and return a weakref to it.
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# If `signal.getsignal` has a bug where it creates a reference cycle
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# keeping alive the current execution frames, `obj` will not be
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# destroyed immediately when this function returns.
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obj = set()
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signal.getsignal(signal.SIGINT)
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return weakref.ref(obj)
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def test_signal_refcycle():
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# Test possible workaround for https://bugs.python.org/issue42248
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with disabled_gc():
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wr = exhibit_signal_refcycle()
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if wr() is None:
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pytest.skip(
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"Python version does not have the bug we're testing for")
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gc.collect()
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with disabled_gc():
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wr = exhibit_signal_refcycle()
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assert wr() is not None
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util._break_traceback_cycle_from_frame(sys._getframe(0))
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assert wr() is None
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