> Hey Vlad
>
> What exactly do you mean by "serialising isc_attach_database by some
> mutex"

Exactly what i wrote. You must not have more than one thread calling
isc_attach_database (or TIBDatabase.Open if you use IBX for example)
simultaneously. Reread my message again ;)

> What would be the advantage of this?

Absence of internal deadlocks

> Will that not cause the exact sort of problem I'm experiencing now.

No

> Where one thread has to wait for the next to complete?

Threads will wait each other at attach time _only_

Regards,
Vlad