Change yield in Lock.acquire() to asyncio.sleep(0)

Author: tekktrik

asyncio/lock.py

@@ -65,7 +65,7 @@ async def acquire(self):
             # Set calling task's data to the lock's queue so it can be removed if needed
             core.cur_task.data = self.waiting
             try:
-                yield
+                core.sleep(0)
             except core.CancelledError as er:
                 if self.state == core.cur_task:
                     # Cancelled while pending on resume, schedule next waiting Task