server program auto shut down

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I haven't looked at your code but i am writing something like that and i'll tell you what i am doing: i use my own class for connection(that i've write, wrapping the standard functions send(), connect(), etc.) and if there is an error i throw an exeption. I put every user that connects to the system in separate thread and if this user close the connection(no matter whether this is normaly or because of error-this is in try catch block) i clear all reserved memory for this user(and exit from the user thread, not from the main one). So use multithreading.
I hope that i am not wrong with the subject If i am sorry