web ui Update feature complete.

src/Lv2PluginChangeMonitor.cpp

@@ -42,8 +42,11 @@ void Lv2PluginChangeMonitor::Shutdown()
     if (monitorThread)
     {
         terminateThread = true;
+        uint64_t val = 1;
+        write(shutdown_eventfd,(void*)&val, sizeof(val));
         monitorThread->join();
         monitorThread = nullptr;
+        close(shutdown_eventfd);
     }
 }