Clean thread exit

better nonblocking socket mode support

Socket.h

@@ -102,6 +102,7 @@ public:
                                        const std::string &protocol = "tcp");
   
   void setKeepalive();
+  void setBlocking(bool flag);
 
 private:
   // Prevent the user from trying to use value semantics on this object
@@ -231,6 +232,7 @@ public:
    */
   TCPSocket *accept() ;
 
+
 private:
   void setListen(int queueLen) ;
   bool keepalive;