Add IWorker, Handle, SingleWorker, Worker classes.

src/App.h

@@ -25,8 +25,12 @@
 #define __APP_H__
 
 
-class Options;
+#include <vector>
+
+
+class Handle;
 class Network;
+class Options;
 
 
 class App
@@ -38,8 +42,13 @@ public:
   int exec();
 
 private:
-  Options *m_options;
+  void startWorders();
+
+  static void* onWorkerStarted(void *arg);
+
   Network *m_network;
+  Options *m_options;
+  std::vector<Handle*> m_workers;
 };