How to initialize MongoClient in a multiprocess Flask application?

_mongo_client = None
_mongo_client_pid = None


def get_mongoclient():
    global _mongo_client, _mongo_client_pid
    if os.getpid() != _mongo_client_pid:
        _mongo_client = MongoClient(...)
        _mongo_client_pid = os.getpid()
    return _mongo_client

try:
    from uwsgi import postfork
except ImportError:
    postfork = lambda f: f  # no-op decorator