Apply suggestions from code review

Co-authored-by: Bénédikt Tran <[email protected]>

Author: yihong0618

Lib/_pyrepl/unix_console.py

@@ -397,6 +397,7 @@ def restore(self):
                 # We can silence the ValueError if signal.signal() raised it
                 # from a non-main thread on a non-Windows platform. Otherwise,
                 # we need to re-raise it as its cause could be different.
+                import threading
                 if threading.current_thread() is threading.main_thread():
                     raise e
             del self.old_sigwinch

Misc/NEWS.d/next/Library/2025-09-28-16-34-11.gh-issue-139391.nRFnmx.rst

@@ -1,2 +1,3 @@
-Fix crash in PyREPL asyncio mode when using Ctrl+Z (suspend) followed by
-``fg`` (resume).
+Fix an issue when, on non-Windows platforms, it was not possible to
+gracefully exit a ``python -m asyncio`` process suspended by Ctrl+Z
+and later resumed by :manpage:`fg` other than with :manpage:`kill`.