Live modifiable server using socket connection and multithreading in C/C++

I want to develop a Client-server program using socket connection and multithreading, condition is that server should be a live server i.e. any changes in the executable code of server program should reflect automatically without manually restarting the server program. Server provide some basic services. E.g. asking client to send a message from user and so on. Let us assume in starting there were 3 services. Now i want to add any new services, I should not restart my server program neither my existing client connection should crash. Can anyone help me out regarding this.