Re: Quick ILE question about service programs

[Jim Langston <jimlangston@xxxxxxxxxxxxxxxx>]

In other words,

All external programs will be loaded at run time.

For procedures:
If a service program is used to link the module, the module will be loaded
at run time.

If there is no service program used, the module will be copied at compile time.

Cool.

Regards,

Jim Langston

Me transmitte sursum, Caledoni!

Jon.Paris@hal.it wrote:
> 
> Definitive answer (It should be anyway since I've been teaching this stuff
> since before it was released!! <g>)
> 
> A CALL (or CALLP where the prototype says EXTPGM) will _always_ be a
> dynamic call.  Fully resolved at run-time.  No static binding of any kind -
> no module copying - just the same old call we had back on S/38 and AS/400
> before ILE.
> 
> An Eval or CALLB  (or CALLP when EXTPROC is specified) will either bind by
> reference (to a Service Program) or bind by copy (to a procedure in a
> separate Module object) - all this provided the call is not to a subproc in
> the same module in which case the question is irrelevant.
> 
> Which of the two methods (copy or reference) is up to the programmer.
> 
> Copy will be used if the module containing the procedure is specified to
> the CRTxxxMOD, CRTPGM or CRTSRVPGM command.  It will also be used if the
> procedure is located by virtue of the module being listed in a binding
> directory.  When copy is used a "copy" of the _module_ is included in the
> *PGM object.  No run-time resolution is required.
> 
> Reference will be used if the service program containing the procedure was
> listed to the CRTxxxMOD, CRTPGM, or CRTSRVPGM. As for bind by copy, it will
> also be used if the service program is located by virtue of being listed in
> a binding directory.  When reference is used no copy is made - rather a
> "memo" is made that a specific service program and specific entry point
> within that service program will be used.  Final linkage is made at
> run-time.
> 
> Since all IBM routines (to the best of my knowledge) are always supplied in
> service programs they will always be bound by reference which means that
> they are not copied anywhere but linked at run-time.
> 
> Hope this helps.
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