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On 28/05/2008, at 7:17 PM, David FOXWELL wrote:
-----Message d'origine-----
De : rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-
bounces@xxxxxxxxxxxx] De la part de Simon Coulter
The service program itself has a copy of the module. The program
has a reference to the module via the service program.
But the call isn't the same as from one OPM to another, isn't it.
Correct. It's not the same. *PGM calling *PGM is dynamic program
call. *PGM calling *SRVPGM, *SRVPGM calling *SRVPGM (and *MODULE
calling MODULE although that's not really what happens) are all bound
calls. Bound calls have two flavours: bind-by-copy and bind-by-
reference. I've already explained that to you.
-----Message d'origine-----
De : rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-
bounces@xxxxxxxxxxxx] De la part de Takken, Cor
the binding is done at program start and will not be modified
during the running of the program (as true dynamic calls are bound,
or rather resolved, at every usage).
If the binding is done at program start, I should be able to delete
the service program and my program will continue to run, right?
Wrong! You will have a learning experience if you attempt this.
Binding is resolved at compile-time for bind-by-copy. In this case
you can delete the module and the call with still work because there
is a copy of the module inside the compiled object.
For bind-by-reference there is a check at compile-time that all
references can be resolved and a further check is performed at run-
time. Does the *SRVPGM exist, are you authorised to it, does the
signature in the *PGM match the signature in the *SRVPGM, and all
*SRVPGMs referenced by a *PGM or *SRVPGM are activated. If you delete
the *SRVPGM you will not be able to invoke the calling *PGM (except
on VRM610 if you defer *SRVPGM activation). Try it.
I think what I really need is the dummies' guide to ILE!
It's called the ILE Concepts Guide. It's well worth a read. Also the
Sourcerer's Guide RedBook. Plus the archives of this list and the
Midrange list have done this topic to death.
Regards,
Simon Coulter.
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