Assuming that the TOD Programmable Register uniquely identifies a machine in a
parallel sysplex and given that successive STCKs yield different values on a
single machine, why not STCKE to get the TOD Programmable Register and STCK to
get a "reference number". Ten bytes. Fewer moving parts.
Bob
Victor Gil wrote:
Thanks to everyone responded.
I should have stated my purpose more clearly - all the application needs is a
some sort of a reference number, unique within a current week. This is under
CICS, so the goal can be easily achieved through the use of a named
counter. However, this would come with the overhead of the counter remote
access and weekly maintenance.
The reason I was looking at the STCKE TOD is - in POP, under SCKPF
instruction, it is documented to be "unique within a multiple-configuration
system". [Isn't this a SYSPLEX?]
So, here's what I think the application should do:
1) determine the current day-of-week [Sun=0,...,Sat=6]; store as byte#1
2) calculate time since today's midnight [by dividing TOD into 0141 DD76 0000
which is "1 DAY" in clock units, then multiplying by this very value and
subtracting the result from the TOD]; this will only occupy 6 bytes in clock
units, so store as bytes ##2-7
3) copy the *last* 4 bytes from the STCKE return into bytes ##8-11
This would require only 11 bytes and should be unique within a current week.
Comments, please?
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