Flush the stdout buffer on Windows to trigger reload (#2604)

jamesh1999 · Kludex · web-flow · commit 86dc4560cedb · 2025-04-14T08:35:26.000Z
Co-authored-by: Marcelo Trylesinski &lt;marcelotryle@gmail.com&gt;
diff --git a/uvicorn/supervisors/basereload.py b/uvicorn/supervisors/basereload.py
@@ -90,6 +90,10 @@ def restart(self) -> None:
             self.is_restarting = True
             assert self.process.pid is not None
             os.kill(self.process.pid, signal.CTRL_C_EVENT)
+
+            # This is a workaround to ensure the Ctrl+C event is processed
+            sys.stdout.write(" ")  # This has to be a non-empty string
+            sys.stdout.flush()
         else:  # pragma: py-win32
             self.process.terminate()
         self.process.join()
