Re:

=?iso-8859-1?Q?Einar_M=E1r_Bj=F6rvinsson?= <emb(at)media(dot)is> writes:
> The program starts by opening a connection to the database, enter the =
> infinite while loop to run some functions.=20

> Inside the while loop it forks many childs which then call one function =
> from the library I made.

Are you trying to say that you are opening a database connection in the
parent process and passing it down for the children to play around with?
This is a fairly bad idea, unless you have an interlock mechanism to
ensure that only one child uses it at a time.

> It is as if the handle to the connection is not valid any more.=20

Perhaps the child is closing the connection when it's done with it.

regards, tom lane