How to use the libmozevent.utils.run_tasks function in libmozevent

# Add pulse listener for task results.
        if self.pulse:
            consumers.append(self.pulse.run())

        # Add communitytc pulse listener for test selection results.
        if self.community_pulse:
            consumers.append(self.community_pulse.run())

        # Start the web server in its own process
        if self.webserver:
            self.webserver.start()

        if consumers:
            # Run all tasks concurrently
            run_tasks(consumers)
        else:
            # Keep the web server process running
            asyncio.get_event_loop().run_forever()

        # Make sure any pending task is run.
        run_tasks(asyncio.Task.all_tasks())

        # Stop the webserver when other async processes are stopped
        if self.webserver:
            self.webserver.stop()

if self.community_pulse:
            consumers.append(self.community_pulse.run())

        # Start the web server in its own process
        if self.webserver:
            self.webserver.start()

        if consumers:
            # Run all tasks concurrently
            run_tasks(consumers)
        else:
            # Keep the web server process running
            asyncio.get_event_loop().run_forever()

        # Make sure any pending task is run.
        run_tasks(asyncio.Task.all_tasks())

        # Stop the webserver when other async processes are stopped
        if self.webserver:
            self.webserver.stop()