Paul Gilmartin wrote:
I had thought that for different processors; more likely on different systems (have I got that term right?) in a sysplex, it is possible that a = b; in fact that is the rationale for providing the programmable value -- it guarantees uniqueness overall. So, if the processor with the higher programmable value does a STCK[E] very shortly before the processor with the lower programmable value so a = b, the first STCKE will store a higher value than the second. The question is whether any event, or communication between processors, in so short an interval (less than one clock tick) can manifest monotonicity violation.
I believe the use of STCKSYNC by very sensitive multi-system routines reduces the possibiliy of this to zero.
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