An RLock is implemented through the threading.RLock() class. It provides the acquire() and release() methods that have the same syntax as the threading.Lock() class.

An RLock block can be acquired multiple times by the same thread. Other threads will not be able to acquire the RLock block until the thread that owns it has made a release() call for every previous acquire() call. Indeed, the RLock block must be released, but only by the thread that acquired it.