def hand_back_worker(self, worker):
        destroy_worker_cb = self._desotry_worker(worker)
        self._worker_busy = False
        self._dispatch_workers()
        return destroy_worker_cb
The client is done and no longer needs the worker.
dataset/ETHPy150Open mgax/tinymail/src/tinymail/async.py/SimpleWorkerManager.hand_back_worker