> I'm using fb 1.5 embedded database.
>
> A multithreaded application should access the same database from
> different threads.
>
> Is it ok to give each an separate ISC_DB_HANDLE or should I share an
> single connection between threads.

You must not share single connection between threads. Ever.

> When sharing Connection: Is the API thread-save ot is the explicite use
> of semaphores required?

Serialization of API calls appeared fbclient only in version 2.5.

SY, SD.