avoid creating Lock/Event without a running loop

dask_jobqueue/core.py

@@ -1,4 +1,5 @@
 from contextlib import contextmanager, suppress
+import asyncio
 import logging
 import math
 import os
@@ -11,6 +12,7 @@
 import tempfile
 import copy
 import warnings
+import functools
 
 import dask
 
@@ -94,7 +96,22 @@
 """.strip()
 
 
-class Job(ProcessInterface, abc.ABC):
+class FixedProcessInterface(ProcessInterface):
+    def __init__(self, scheduler=None, name=None):
+        self.address = getattr(self, "address", None)
+        self.external_address = None
+        self.status = Status.created
+
+    @functools.cached_property
+    def lock(self):
+        return asyncio.Lock()
+
+    @functools.cached_property
+    def _event_finished(self):
+        return asyncio.Event()
+
+
+class Job(FixedProcessInterface, abc.ABC):
     """ Base class to launch Dask workers on Job queues
 
     This class should not be used directly, use a class appropriate for