make sure that we have the lock here...

bitelab/__init__.py

@@ -132,6 +132,8 @@ class BoardImpl:
 		self.reserved = False
 
 	async def update_attrs(self, **attrs):
+		assert self.lock.locked() and self.reserved
+
 		for i in attrs:
 			self.attrcache[i] = await self.attrmap[i].setvalue(attrs[i])