Re: Quick ILE question about service programs

Hi Jim,

Assuming that GetNextSuffix and CloseCCOHD are in the service programs, the
eval and callp would simply be references -- the service programs would not
be included in BSTORDADD.

If you had done a CRTBNDRPG which included the individual modules CARTAGE,
DATETIME and SYSTEM, then all 3 modules would be part of BSTORDADD.

Of course if you got Jon's post, you probably already figured that out...

Regards,
Peter Dow
Dow Software Services, Inc.
909 425-0194 voice
909 425-0196 fax


----- Original Message -----
From: "Jim Langston" <jimlangston@conexfreight.com>
To: <RPG400-L@midrange.com>
Sent: Friday, April 27, 2001 4:06 PM
Subject: Re: Quick ILE question about service programs


> Okay, let me see if I have this straight...
>
> I created 3 modules, CARTAGE, DATETIME, SYSTEM.  I then created 2 service
> programs from these 3 modules, CARTAGE and GENERAL.  Then I created a
binding
> directory from these 2 service programs, CARTAGE.
>
> When I compile my program BSTORDADD it uses this header:
> H DftActGrp( *No ) BndDir('CARTAGE')
>
> I am using 2 different methods to call the functions in the modules in my
program:
> C                   Eval      FileSuffix = GetNextSuffix(FilePrefix)
> C                   CallP     CloseCCOHD
>
> Eval when the function is returning a value, CallP when the function is
not
> returning a value.
>
> Now.  What is included in my *PGM?  I was thinking the only thing that
would
> be included in the *PGM object would be the source file, BSTORDADD and
that
> the modules included in the 2 service programs would be loaded at run
time.
>
> Am I wrong?
>
> Regards,
>
> Jim Langston
>
> Me transmitte sursum, Caledoni!
>
> "DeLong, Eric" wrote:
> >
> > Ok, here's my take.....
> >
> > Module objects are bound directly into the program or service program.
That
> > is, since a module contains executable code (more or less), you've
> > essentially done a /copy. You've made a bigger program because the
> > executable code has been bound directly into the compiled program
object.
> >
> > Service programs are bound by reference only. As each service program
has
> > details about the public and private methods contained within it (binder
> > language), the compiler retrieves the address and interface details of
the
> > exported procedure from the service program and binds that into the
program
> > rather than the actual executable code. This keeps the program object
> > smaller since that executable code was not actually copied into the
program
> > referencing the exported method. You're really just calling an external
> > proc, just like a dynamic call in RPG400. But because the address and
> > interface of the program/procedure is determined at compile time, you
save a
> > heap of work involved in the dynamic call.......
> >
> > That really didn't come out like I wanted it to. If this doesn't make
any
> > sense, let me know and I'll try to do better.
> >
> > hth,
> > Eric DeLong
> >
> > -----Original Message-----
> > From: Jim Langston [mailto:jimlangston@conexfreight.com]
> > Sent: Friday, April 27, 2001 4:03 PM
> > To: RPG400-L@midrange.com
> > Subject: Re: Quick ILE question about service programs
> >
> > When you use the C functions, you bind with the directory QC2LE.
> >
> > I am a little fuzzy myself and when the modules are included in the *PGM
> > object and when they aren't.  It is my understanding, which may be
wrong,
> > that when I CRTBNDRPG I am not including the modules into my *PGM file,
but
> > just linking to them at run time.
> >
> > It should be the same with the QC2LE, these modules should just be
linked
> > so that at run time the OS will load the module and run the code.
> >
> > Anyone have a different angle on this?
> >
> > Regards,
> >
> > Jim Langston
> >
> > Slava Zharichenko wrote:
> > >
> > > Hi,
> > > i am reading 'Who Knew you....' and finding it very helpful. It
written in
> > > the plain language and have a bunch of examples, i start reading it
and
> > > could not stop until reached Chapter 5.
> > >
> > > I have a question about service program and binding and i think i have
an
> > > answer but not 100% sure.
> > >
> > > If i create service program which includes some of system supplied
> > > procedures like C math for example, will service program object
contain
> > > those procedures or it will just bind them the way CRTPGM does? I
think i
> > > understand correctly when program is created by binding Main procedure
> > with
> > > service program , service program itself is not 'added' to the Main
PGM it
> > > just being 'bind' to it for quick address resolution e.t.c
> > >
> > > Thank you
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