On Wed, 11 Jan 2017 10:22:01 -0700, Paul Gilmartin ([email protected]) wrote about "DAIR? (was: "task level" TIOT & XTIOT? ...)" (in <[email protected]>):
> On 2017-01-10, at 17:46, David W Noon wrote: >> >>> And how would you preserve one of the aboriginal design objectives of >>> OS/360: >>> the ability to ENQ all needed resources before job initiation to avoid >>> deadlocks. >> >> That went out the window with the arrival of MVS/370, which introduced >> SVC 99. >> > History question: Didn't DAIR, with similar function, antedate MVS/370? I assume you mean IKJDAIR. That was more limited than SVC 99, but did basic dynamic allocation quite well. It was part of the TMP and its use was limited to TSO. In those days TSO was not an address space, but simply a region within the MVT or OS/VS2 address space. It was MVS/370 that allowed any address space to perform dynamic allocation. -- Regards, Dave [RLU #314465] *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* [email protected] (David W Noon) *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
