mc_client class MemcachedCache(BaseMemcachedCache): "An implementation of a cache binding using python-memcached" def __init__(self, server, params): super(MemcachedCache, self).__init__(server, params, library=memcache, value_not_found_exception=ValueError) @property def _cache(self): """ Implements transparent thread-safe access to a memcached client. """ global mc_client if mc_client is None: mc_client = self._lib.Client(self._servers) return mc_client
self._lib.Client(self._servers)可能被初始化多次,因为没有加锁。