Additional to the actual signal, send a message on the control port.

jupyter_client/manager.py

@@ -254,7 +254,7 @@ def start_kernel(self, **kw):
             # If kernel_cmd has been set manually, don't refer to a kernel spec
             # Environment variables from kernel spec are added to os.environ
             env.update(self.kernel_spec.env or {})
-        
+
         # launch the kernel subprocess
         self.log.debug("Starting kernel: %s", kernel_cmd)
         self.kernel = self._launch_kernel(kernel_cmd, env=env,
@@ -414,6 +414,7 @@ def interrupt_kernel(self):
             if sys.platform == 'win32':
                 from .win_interrupt import send_interrupt
                 send_interrupt(self.kernel.win32_interrupt_event)
+                self._send_signal_message(signal.SIGINT)
             else:
                 self.signal_kernel(signal.SIGINT)
         else:
@@ -436,9 +437,17 @@ def signal_kernel(self, signum):
                 except OSError:
                     pass
             self.kernel.send_signal(signum)
+            self._send_signal_message(signum)
         else:
             raise RuntimeError("Cannot signal kernel. No kernel is running!")
 
+    def _send_signal_message(self, signum):
+        """Send a signal request to the kernels control socket."""
+        content = dict(signum=signum)
+        msg = self.session.msg("signal_request", content=content)
+        self._connect_control_socket()
+        self.session.send(self._control_socket, msg)
+
     def is_alive(self):
         """Is the kernel process still running?"""
         if self.has_kernel: