Now time for the real question: What was your need and how did you determine that an SRB was the best sokution?
On Mon, 17 Oct 2011 19:03:53 -0400 Micheal Butz <michealb...@optonline.net> wrote: :>I am issuing a branch entry form of a macro, in the SRB :> :>So for the SRB control block 241, :> :>For the SRB code 227 :> :> Thank you for all your help :> :> :> :>-----Original Message----- :>From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On Behalf :>Of Chris Craddock :>Sent: Monday, October 17, 2011 6:27 PM :>To: IBM-MAIN@bama.ua.edu :>Subject: Re: SRBEPA :> :>On Mon, Oct 17, 2011 at 5:31 PM, Shmuel Metz (Seymour J.) < :>shmuel+ibm-m...@patriot.net> wrote: :> :>> In :>> <cakxahqwwofk2cmeed1akporkeytzvz-_iq5pk1kmi3bb8fx...@mail.gmail.com>, :>> on 10/17/2011 :>> at 11:27 AM, Chris Craddock <crashlu...@gmail.com> said: :>> :>> >On the other hand; If you are trying to schedule an SRB into :>> >-any-other- address space, then (somehow) you have to make sure :>> >the code will be addressable when the SRB is dispatched. In :>> >general that means loading it into common storage (technically it :>> >should be in SQA rather than CSA, but that's a minor nit) :>> :>> Why? As long as the address is accessible and the code will be :>> addressable, why can't it be private and pagable? MVS can handle a :>> page fault in an SRB routine. :>> :>> Now, if you're going to schedule SRB's into multiple address spaces :>> for the same routine, then you would want the code in common so that :>> you only need a single copy. :> :> :> :>If you can arrange ahead of time for the code to be loaded in the foreign :>address space then of course it can be in private. I said as much. It is :>also true that SRB's can take page faults, so the SRB code *can* be in :>pageable storage... However, it is very desirable for the SRB to be able to :>run through its processing without taking any unnecessary page faults. An :>ordinary SRB dispatch is an extremely efficient mechanism, but if the SRB :>subsequently interrupted and has to be suspended (e.g. for a page fault) the :>system has quite a lot of work to do to save its state (SSRB, FRR stack, :>linkage stack etc). It is still fast, but why take the hit? Kind of like the :>old joke about Ferraris. She's a made a to go, not a to stop. -- Binyamin Dissen <bdis...@dissensoftware.com> http://www.dissensoftware.com Director, Dissen Software, Bar & Grill - Israel Should you use the mailblocks package and expect a response from me, you should preauthorize the dissensoftware.com domain. I very rarely bother responding to challenge/response systems, especially those from irresponsible companies. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
