Hi all,

I'm programming a kind-of-messenger server based on winsock and select to avoid blocking.
What I do is the classica:
while(1){
select(0,read,write,exp); //0 Win32
bla bla processing.
}
I've seen that when running the program consumes almost 50-60 % of CPU, the rest goes to CSRSS.exe. Is it normal? And, what is this CSRSS service?

Thanks.

select in a tight loop will consume high CPU on windows, put a small sleep command in there or use the asynch model of WinSock if CPU time is a real issue.

As a general rule-of-thumb, using select() on windows is less optimal than message-pump based asynch system that WinSock has (sends a message when a requested event occured on a socket, instead of polling). On many systems select is implemented in terms on poll and can be quite CPU intensive.