fixed race condition during shutdown

src/ebusd/main.cpp

@@ -669,11 +669,11 @@ void signalHandler(int sig) {
     break;
   case SIGINT:
     logNotice(lf_main, "SIGINT received");
-    shutdown();
+    s_mainLoop->join();
     break;
   case SIGTERM:
     logNotice(lf_main, "SIGTERM received");
-    shutdown();
+    s_mainLoop->join();
     break;
   default:
     logNotice(lf_main, "undefined signal %s", strsignal(sig));

src/ebusd/mainloop.cpp

@@ -100,7 +100,7 @@ result_t UserList::addFromFile(map<string, string>& row, vector< map<string, str
 MainLoop::MainLoop(const struct options opt, Device *device, MessageMap* messages)
   : Thread(), m_device(device), m_reconnectCount(0), m_userList(opt.accessLevel), m_messages(messages),
     m_address(opt.address), m_scanConfig(opt.scanConfig),
-    m_initialScan(opt.initialScan), m_enableHex(opt.enableHex) {
+    m_initialScan(opt.initialScan), m_enableHex(opt.enableHex), m_shutdown(false) {
   // open Device
   result_t result = m_device->open();
   if (result != RESULT_OK) {

src/ebusd/mainloop.h

@@ -112,6 +112,11 @@ class MainLoop : public Thread, DeviceListener {
    */
   ~MainLoop();
 
+  /**
+   * Shutdown the main loop.
+   */
+  void shutdown() { m_shutdown = true; }
+
   /**
    * Get the @a BusHandler instance.
    * @return the created @a BusHandler instance.