On Sun, 27 Apr 2008 12:05:46 -0700 Peter <[EMAIL PROTECTED]> wrote: :>On Apr 27, 2008, at 11:26 AM, Binyamin Dissen wrote:
:>> How is SRB to TCB percolation instantiated? :>> Is an automatic FRR added which does the percolation if nothing :>> recovers? :>> Stored somewhere in memory? :>Its your obligation to initialize it. :>In the case of STARTIO, you do it this way: :>STARTIO SRB=xxxx,TCB=yyyy (original way) :>or :>STARTIO SRB=xxxx,TCB=0 (new way) :>in the second case, the IECIOSCN grabs the TCB address from PSATOLD. :>There are numerous cases where the first (and which was formerly the :>only) way is required: when I/O is started from within a process :>which itself is run under an SRB, or, possibly, is run in a disabled :>interrupt exit (DIE) and for which the TCB and the SRB currently :>dispatched are completely arbitrary (taken to mean indeterminate). :>In the basic case of a SCHEDULE, the user initializes the field to :>associate the SRB with its TCB. :>No automatic FRR that I am aware of. But once the code associated with the SRB gets control the SRB becomes mere data. Upon abend the SRB contents cannot be used by the system to determine where/if to percolate. My query was more as to how something getting control in the context of SRB mode can determine if there is an associated TCB. -- Binyamin Dissen <[EMAIL PROTECTED]> 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 [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
