Re: Service Programs

[Rudolf Wiesmayr <Rudolf.Wiesmayr@xxxxxxxxxxx>]

John Dorn wrote:
> 
> Are you using binder source?  We use binder source to set the service
> program's signature and also to list the exported functions.  For
> example,
> 
> STRPGMEXP PGMLVL(*CURRENT) LVLCHK(*YES) SIGNATURE('srvpgm name')
>    EXPORT SYMBOL("Func1")
>    EXPORT SYMBOL("Func2")
> ENDPGMEXP
> 
> New functions to be exported by the service program are always added
> to the end of the export list.  Using this method, other PGMs and

They HAVE to be added at the end! If you stuff them somewhere in the
middle, the *PRV mechanism doesn't work.

> SRVPGMs only need to be re-bound to the changed service program if
> the order of the exported functions change (adding additional functions
> is no problem).  If you are not using binder source (i.e.,
> EXPORT(*SRCFILE)) when building your service program then I would
> assume you must re-bind all dependent PGMs and SRVPGMs if you change
> your service program.

I have been using the *CURRENT / *PRV stuff in binder language for 
a long time on several evolving *SRVPGMs in our C library.
Some of them are large and constantly growing (i.e. new functions
are added every couple of weeks, but none deleted and no critical
interface changes in the existing functions). One of the most frequenly
used *SRVPGMs has currently 16 different signatures and we had no more
recompiles in applications since almost a year (On May 30 1996 there
was a interface change in one of the functions).

Regards,
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