What about a driver program which OPENs a DD name then ATTACHes the actual
"main" routine with the DCB=. This driver has an API such that a subtask can
request the driver program, in its TCB, do a CLOSE / DEALLOCATE / ALLOCATE /
OPEN of the DCB which it used in the ATTACH? Granted, this is likely very
dangerous due to timing issues (or ENQ SMC). But does the IBM documentation
explicitly say that the parent TCB cannot do this? "That which is not
specifically forbidden, is allowed."
<quote>
,DCB=dcb addr
Specifies the address of the data control block for the partitioned data
set containing the entry name.
Note: The DCB must be opened before the ATTACH macro is issued and must be
the DCB used in the BLDL that built the 62-byte DE list entry. The DCB must
remain open until the subtask becomes active, and it should not be closed
immediately following the ATTACH.
Note: DCB must reside in 24-bit addressable storage.
</quote>
seems vague to me. Is the DCB actually used? Or the DEB pointed to by the DCB?
The above says "should not be closed immediately". How long after the ATTACH?
Or should it say only after the subtask terminates?
--
John McKown
Systems Engineer IV
IT
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> -----Original Message-----
> From: IBM Mainframe Discussion List
> [mailto:[email protected]] On Behalf Of Jim Mulder
> Sent: Friday, July 22, 2011 2:07 PM
> To: [email protected]
> Subject: Re: dynamic STEPLIB
>
> IBM Mainframe Discussion List <[email protected]> wrote on
> 07/22/2011
> 08:46:56 AM:
>
> > Not every product that runs under TSO/ISPF can use LIBDEFs
> or ALTLIBs,
> or
> > TASKLIBs.
> >
> > I think there is a Share requirement out there (for ages I
> think) for
> IBM to
> > address this issue. So far, there is still no dynamic
> Steplib process.
> >
> > I think the TSO-REXX group has had some discussions on this
> topic as
> well.
>
> The only supported mechanism in MVS for adding to the
> module library search order within as address space is an ATTACH with
> a TASKLIB. This is the only supported way to set TCBJLB.
>
> Any program which modifies TCBJLB in an existing TCB is
> wrong to do so. I would recommend against having any such
> program installed on your system.
>
> Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY
>
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