IBM Mainframe Discussion List <IBM-MAIN@BAMA.UA.EDU> wrote on 01/25/2007 01:35:05 PM:
> Rob asks... > > I have often wondered why ASSBSTKN is not GUPI as the values are > > guaranteed to be unique between IPLs. I remember asking IBM many years > > ago and was told that "it just wasn't, OK". From the SP5.1.0 IHAASSB macro: */*01* STATUS: HBB5510 */* */*01* EXTERNAL CLASSIFICATION: */*02* DMTI:BASE */*02* GUPI:FIELDS */* ASSBEVST */* ASSBVFAT */* ASSBSTKN */* ASSBWTCT */* ASSBOASB */*02* PSPI:FIELDS */* ASSBJBNI */* ASSBJBNS */* ASSBVAB > > Can you say "initiators" boys and girls? > > The STOKEN for an address space does indeed remain unique for the life > of the IPL, but many jobs run (serially) within an initiator and each of > those would "see" the same STOKEN value returned by EXTRACTH, or just by > snarfing it out of the ASSB. > > But -logically- job 1 and job 2 are different things that just happened > to run in the same space. You would very likely land in two wildly > different places on successive SRB schedules. I suspect the same issue > exists for other "reused" address spaces such as BPXAS' and those ASCH > thingies I've never had anything to do with. > > Bottom line, just knowing the STOKEN - and even the jobname(!) isn't > really enough. You would have to use the STOKEN to at least get into the > right address space and when you "get there", do a little local sniffing > to decide if you're REALLY REALLY where you meant to be. The details > make this a tough little problem to crack on ones own eh? You could obtain and save the TTOKEN of the TCB pointed to by ASCBXTCB. At some point in the future, if the TTOKEN of the TCB pointed to by ASCBXTCB matches the TTOKEN you save previously, then it is still the same job step (because the TCB pointed to by ASCBXTCB terminates when a job step terminates). Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
