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@ -809,6 +809,31 @@ class TestLRU(unittest.TestCase):
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self.assertEqual(fib.cache_info(),
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functools._CacheInfo(hits=0, misses=0, maxsize=None, currsize=0))
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def test_need_for_rlock(self):
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# This will deadlock on an LRU cache that uses a regular lock
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@functools.lru_cache(maxsize=10)
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def test_func(x):
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'Used to demonstrate a reentrant lru_cache call within a single thread'
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return x
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class DoubleEq:
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'Demonstrate a reentrant lru_cache call within a single thread'
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def __init__(self, x):
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self.x = x
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def __hash__(self):
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return self.x
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def __eq__(self, other):
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if self.x == 2:
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test_func(DoubleEq(1))
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return self.x == other.x
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test_func(DoubleEq(1)) # Load the cache
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test_func(DoubleEq(2)) # Load the cache
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self.assertEqual(test_func(DoubleEq(2)), # Trigger a re-entrant __eq__ call
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DoubleEq(2)) # Verify the correct return value
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def test_main(verbose=None):
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test_classes = (
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TestPartialC,
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