Re: Questions about FORK.

Fork() creates a new process. The entire memory image of the old
process is copied into the new process (well, it's copy-on-write for
most OSs, but the outcome is the same). Any changes one process makes,
cannot be seen by the other process.

So changing d->connected in the email process doesn't change
d->connected in the main process.

You're going to need to either implement this as a thread (which does
share the memory image) (google pthreads) or implement some kind of
inter-process communication. I would go with threads (although I've
never actually done threading in C or used pthreads to do threading in
C, so I can't tell you how difficult it is (it's pretty easy in
Python, though))

-David

On 8/15/06, Valnir <[email protected]> wrote:
> Ok.. I'm working on an account system, and want to make sure that no two
> accounts have the same email address. Don't want users having duplicate
> accounts. The issue I'm having is that during account creation I'm scanning
> all the existing user accounts to see if any have the same address. I'm
> using fork() so that I don't have the entire mud come to a screeching halt
> while it scans, but for some reason, although everything in the fork() seems
> to be working fine, it doesn't set the d->connected correctly or process the
> nanny function again at the end the way I'm wanting it to. Ideas? Thansk!
>
> - Valnir
>
> /* Code snippet */
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