Issue #28500: Fix asyncio to handle async gens GC from another thread.

Lib/asyncio/base_events.py

@@ -351,6 +351,9 @@ class BaseEventLoop(events.AbstractEventLoop):
         self._asyncgens.discard(agen)
         if not self.is_closed():
             self.create_task(agen.aclose())
+            # Wake up the loop if the finalizer was called from
+            # a different thread.
+            self._write_to_self()
 
     def _asyncgen_firstiter_hook(self, agen):
         if self._asyncgens_shutdown_called:

Misc/NEWS

@@ -38,6 +38,8 @@ Library
 
 - Issue #28492: Fix how StopIteration exception is raised in _asyncio.Future.
 
+- Issue #28500: Fix asyncio to handle async gens GC from another thread.
+
 Build
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