def restart_kernel(self, message, now=False):
        """ Attempts to restart the running kernel.
        """
        # FIXME: now should be configurable via a checkbox in the dialog.  Right
        # now at least the heartbeat path sets it to True and the manual restart
        # to False.  But those should just be the pre-selected states of a
        # checkbox that the user could override if so desired.  But I don't know
        # enough Qt to go implementing the checkbox now.

        if self.custom_restart:
            self.custom_restart_requested.emit()
            return

        if self.kernel_manager:
            # Pause the heart beat channel to prevent further warnings.
            self.kernel_client.hb_channel.pause()

            # Prompt the user to restart the kernel. Un-pause the heartbeat if
            # they decline. (If they accept, the heartbeat will be un-paused
            # automatically when the kernel is restarted.)
            if self.confirm_restart:
                buttons = QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No
                result = QtWidgets.QMessageBox.question(self, 'Restart kernel?',
                                                    message, buttons)
                do_restart = result == QtWidgets.QMessageBox.Yes
            else:
                # confirm_restart is False, so we don't need to ask user
                # anything, just do the restart
                do_restart = True
            if do_restart:
                try:
                    self.kernel_manager.restart_kernel(now=now)
                except RuntimeError as e:
                    self._append_plain_text(
                        'Error restarting kernel: %s\n' % e,
                        before_prompt=True
                    )
                else:
                    self._append_html("<br>Restarting kernel...\n<hr><br>",
                        before_prompt=True,
                    )
            else:
                self.kernel_client.hb_channel.unpause()

        else:
            self._append_plain_text(
                'Cannot restart a Kernel I did not start\n',
                before_prompt=True
            )
 Attempts to restart the running kernel.
        
angrmanagement/vendor/qtconsole/frontend_widget.py