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, 36 insertions, 0 deletions

diff --git a/tests/extmod/uasyncio_new_event_loop.py b/tests/extmod/uasyncio_new_event_loop.py
new file mode 100644
index 0000000000..b711befba9
--- /dev/null
+++ b/tests/extmod/uasyncio_new_event_loop.py
@@ -0,0 +1,36 @@
+# Test Loop.new_event_loop()
+
+try:
+    import uasyncio as asyncio
+except ImportError:
+    try:
+        import asyncio
+    except ImportError:
+        print("SKIP")
+        raise SystemExit
+
+
+async def task():
+    for i in range(4):
+        print("task", i)
+        await asyncio.sleep(0)
+        await asyncio.sleep(0)
+
+
+async def main():
+    print("start")
+    loop.create_task(task())
+    await asyncio.sleep(0)
+    print("stop")
+    loop.stop()
+
+
+# Use default event loop to run some tasks
+loop = asyncio.get_event_loop()
+loop.create_task(main())
+loop.run_forever()
+
+# Create new event loop, old one should not keep running
+loop = asyncio.new_event_loop()
+loop.create_task(main())
+loop.run_forever()