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Fix race in ThreadSafeSingleton (#322)

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Dmitry Rassoshenko 2020-11-10 22:57:10 +03:00 committed by GitHub
parent 4120afd1c3
commit fb0d99c1c9
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1 changed files with 10 additions and 6 deletions
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src/dependency_injector/providers.pyx
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@ -2178,15 +2178,19 @@ cdef class ThreadSafeSingleton(BaseSingleton):
:rtype: None :rtype: None
""" """
with self.__storage_lock:
self.__storage = None self.__storage = None
cpdef object _provide(self, tuple args, dict kwargs): cpdef object _provide(self, tuple args, dict kwargs):
"""Return single instance.""" """Return single instance."""
storage = self.__storage
if storage is None:
with self.__storage_lock: with self.__storage_lock:
if self.__storage is None: if self.__storage is None:
self.__storage = __factory_call(self.__instantiator, self.__storage = __factory_call(self.__instantiator,
args, kwargs) args, kwargs)
return self.__storage storage = self.__storage
return storage
cdef class DelegatedThreadSafeSingleton(ThreadSafeSingleton): cdef class DelegatedThreadSafeSingleton(ThreadSafeSingleton):