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Issue #28991: Fix obscure reentrancy bug in functools.lru_cache().

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This commit is contained in:
Raymond Hettinger 2016-12-16 13:57:40 -08:00
parent ac13beeef5
commit af56e0e70f
3 changed files with 20 additions and 2 deletions
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6
Lib/functools.py
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@ -516,14 +516,16 @@ def _lru_cache_wrapper(user_function, maxsize, typed, _CacheInfo):
last = root[PREV]
link = [last, root, key, result]
last[NEXT] = root[PREV] = cache[key] = link
full = (len(cache) >= maxsize)
# Use the __len__() method instead of the len() function
# which could potentially be wrapped in an lru_cache itself.
full = (cache.__len__() >= maxsize)
misses += 1
return result
def cache_info():
"""Report cache statistics"""
with lock:
return _CacheInfo(hits, misses, maxsize, len(cache))
return _CacheInfo(hits, misses, maxsize, cache.__len__())
def cache_clear():
"""Clear the cache and cache statistics"""