Better way to stop server

navpoint/about.py

@@ -1,10 +1,19 @@
+import multiprocessing
 import webbrowser
 import threading
+import asyncio
+import signal
+import time
+import sys
+import os
 import markdown
 import tornado.ioloop
 import tornado.web
 import navpoint.fix_path
 
+def timed_exit():
+    time.sleep(3)
+    os.kill(os.getpid(), signal.SIGTERM)
 
 class AboutHandler(tornado.web.RequestHandler):
     def get(self):
@@ -44,19 +53,22 @@ class AboutHandler(tornado.web.RequestHandler):
 </html>
 """
         )
-        tornado.ioloop.IOLoop.instance().stop()
+        threading.Thread(target=timed_exit).start()
 
 
-def _run():
+async def _run():
     app = tornado.web.Application(
         [
             ("/", AboutHandler),
         ]
     )
     app.listen(9999, address="127.0.0.1")
-    tornado.ioloop.IOLoop.instance().start()
+    await asyncio.Event().wait()
+
+def _wrapper():
+    asyncio.run(_run())
 
 
 def about():
-    threading.Thread(target=_run).start()
+    multiprocessing.Process(target=_wrapper).start()
     webbrowser.open("http://127.0.0.1:9999/")