smartools: add destructor to call ThreadLoop::join()

Change-Id: I31c5103f78fa2516eff930ed874856589206b9c7

src/smartools.cpp

@@ -39,6 +39,11 @@ Smartools::Smartools()
 : loop_([this] { return true; }, [this] { process(); }, [] {})
 {}
 
+Smartools::~Smartools()
+{
+    loop_.join();
+}
+
 void
 Smartools::sendInfo()
 {

src/smartools.h

@@ -40,6 +40,7 @@ class Smartools
 
     private:
         Smartools();
+        ~Smartools();
         void process();
         std::map<std::string, std::string> information_;
         std::mutex mutexInfo_; // Protect information_ from multithreading