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Issue #28969: Fixed race condition in C implementation of functools.lru_cache.

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KeyError could be raised when cached function with full cache was
simultaneously called from differen threads with the same uncached arguments.
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Serhiy Storchaka 2017-01-12 19:42:20 +02:00
commit 617c7753ce
5 changed files with 78 additions and 29 deletions
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Include/dictobject.h
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@ -117,6 +117,7 @@ PyAPI_FUNC(int) _PyDict_HasOnlyStringKeys(PyObject *mp);
Py_ssize_t _PyDict_KeysSize(PyDictKeysObject *keys);
Py_ssize_t _PyDict_SizeOf(PyDictObject *);
PyAPI_FUNC(PyObject *) _PyDict_Pop(PyObject *, PyObject *, PyObject *);
PyObject *_PyDict_Pop_KnownHash(PyObject *, PyObject *, Py_hash_t, PyObject *);
PyObject *_PyDict_FromKeys(PyObject *, PyObject *, PyObject *);
#define _PyDict_HasSplitTable(d) ((d)->ma_values != NULL)