100% CPU Usage...

[Alexis Blaze]

hi all.. i was developing a new software for my college project.. it was acting as a middletier between application and database for safety reason... the software works fine but when i look at task manager->performance, when my software ran, cpu time will rise up to 100%...

here's a little look at how my software works logically...

BEGIN LISTING
-----------------------------------------------------------------------------
// this will load up some configuration and prepare the socket
middleTier.InitMiddleTier();

while(!middleTier.isShutDown()) {
// here i will see if the socket active (is any client trying to connect)
if(middleTier.peekSocket()) {
// if the socket is active, accept the connection, then create a thread
// for handling further request from that client
middleTier.addClient();
}
}

// the middleTier has been closed/died, cleanup
middleTier.cleanUp();
-------------------------------------------------------------------------------
END LISTING

can you spot the problem why my software would eat up cpu time to 100%?

[Krzysztof Duleba]

You should be using select instead of active waiting. Use Google to find more info about it.

[Alexis Blaze]

The middleTier.peekSocket() method is actually a select with error handling, but it's on unblocking state...

The problem is, if the select is blocking, then when i stop the application then it will still waiting for a client...

Can we somehow notify the select to stop waiting?

[Krzysztof Duleba]

Select would be useless if it couldn't handle it, would it? You can use exception sets, you can set a timeout. Read the manual or look for examples, there are plenty of them on the web.