darc.db.QR_LOCK: multiprocessing.Lock

I/O lock for the requests database _queue_requests.txt.

darc.db.QS_LOCK: Union[multiprocessing.Lock, threading.Lock, contextlib.nullcontext]

I/O lock for the selenium database _queue_selenium.txt.

If FLAG_MP is True, it will be an instance of multiprocessing.Lock. If FLAG_TH is True, it will be an instance of threading.Lock. If none above, it will be an instance of contextlib.nullcontext.