extmod/uasyncio: Add Loop.new_event_loop method.

This commit adds Loop.new_event_loop() which is used to reset the singleton
event loop.  This functionality is put here instead of in Loop.close() to
make it possible to write code that is compatible with CPython.

1 files changed, 13 insertions, 7 deletions

diff --git a/extmod/uasyncio/core.py b/extmod/uasyncio/core.py
index e2f64119c..689487d36 100644
--- a/extmod/uasyncio/core.py
+++ b/extmod/uasyncio/core.py
@@ -132,13 +132,6 @@ class IOQueue:
 ################################################################################
 # Main run loop
 
-# TaskQueue of Task instances
-_task_queue = TaskQueue()
-
-# Task queue and poller for stream IO
-_io_queue = IOQueue()
-
-
 # Ensure the awaitable is a task
 def _promote_to_task(aw):
     return aw if isinstance(aw, Task) else create_task(aw)
@@ -269,3 +262,16 @@ class Loop:
 # The runq_len and waitq_len arguments are for legacy uasyncio compatibility
 def get_event_loop(runq_len=0, waitq_len=0):
     return Loop
+
+
+def new_event_loop():
+    global _task_queue, _io_queue
+    # TaskQueue of Task instances
+    _task_queue = TaskQueue()
+    # Task queue and poller for stream IO
+    _io_queue = IOQueue()
+    return Loop
+
+
+# Initialise default event loop
+new_event_loop()