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Fix #8: Concurrency bug in LRUCache #191

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Fix #8: Concurrency bug in LRUCache #191

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26 changes: 15 additions & 11 deletions jinja2/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -464,17 +464,21 @@ def __getitem__(self, key):

Raise a `KeyError` if it does not exist.
"""
rv = self._mapping[key]
if self._queue[-1] != key:
try:
self._remove(key)
except ValueError:
# if something removed the key from the container
# when we read, ignore the ValueError that we would
# get otherwise.
pass
self._append(key)
return rv
self._wlock.acquire()
try:
rv = self._mapping[key]
if self._queue[-1] != key:
try:
self._remove(key)
except ValueError:
# if something removed the key from the container
# when we read, ignore the ValueError that we would
# get otherwise.
pass
self._append(key)
return rv
finally:
self._wlock.release()

def __setitem__(self, key, value):
"""Sets the value for an item. Moves the item up so that it
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