How would TCB switching occur at all? Are these programs running in
CICS? If so, you cannot use the DYNAM compiler option for COBOL.
-jc-
> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:[email protected]] On
Behalf Of Barkow, Eileen
> Sent: Thursday, July 14, 2011 9:30 AM
> To: [email protected]
> Subject: Re: running Assembler I/O macro code as AMODE 31, RMODE ANY
>
> The programmer has a question about possible TCB switching:
>
> Option 2 seems better. DATA(31) should allow most of the callers
storage to reside above the line, and
> switch to below the line processing only when calling the assembler
routine. Would excessive TCB
> switching result if the assembler program is invoked repeatedly for
file i/o, or does that not come
> into play?
>
> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:[email protected]] On
Behalf Of Farley, Peter x23353
> Sent: Wednesday, July 13, 2011 4:53 PM
> To: [email protected]
> Subject: Re: running Assembler I/O macro code as AMODE 31, RMODE ANY
>
> Option #1 is simpler, that is true. I also forgot to say that the
COBOL compiler option DYNAM will
> also be required so that if the 24-bit assembler program is called
using CALL literal (like CALL
> 'MYASMIO'), then it will be loaded at run time instead of linked in
statically. I assume from your
> original post that this must be your case, otherwise the programmers
would not be worrying about
> including the 24-bit program as part of the link step.
>
> However, Option #2 does have the advantage of allowing the
WORKING-STORAGE of the COBOL programs to
> grow much larger in 31-bit storage without worrying about using up all
available 24-bit storage. If
> growth of internal tables or data in the COBOL programs over time is a
possible future maintenance
> headache for using DATA(24), it might be better (though more work) to
bite the bullet and take option
> #2 now instead of later.
>
> OTOH getting that 24-bit assembler I/O program correctly converted to
31-bit is the better long-term
> option over all, and DATA(24) plus DYNAM gives you time to do that as
a priority. When that is done
> you can switch the COBOL compiles to DATA(31) and you're done.
>
> Good luck, and feel free to ask more questions if you need to.
>
> HTH
>
> Peter
>
> > -----Original Message-----
> > From: IBM Mainframe Discussion List [mailto:[email protected]] On
> > Behalf Of Barkow, Eileen
> > Sent: Wednesday, July 13, 2011 4:06 PM
> > To: [email protected]
> > Subject: Re: running Assembler I/O macro code as AMODE 31, RMODE ANY
> >
> > Thank you Peter.
> > I missed your post yesterday morning as well as some others.
> > I am beginning to think that there was delay in the email yesterday
> > morning and the msgs were delivered later in the
> > Day so I did not notice the earlier ones.
> >
> > Option #1 sounds simpler than 2 since it does not require any code
> > changes.
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