I must have total misunderstood TS state. I was under the impression that the TS would abort if *any* code read or updated any storage updated by the TS code. TS state should abort if any interrupt occurs while in TS state, even an I/O or External (e.g. timer) interrupt. This means that the "unit of work" (TCB or SRB) cannot be suspended or switch to another CPU. It would also abort if the TS code tried to use any "unsupported" (by TS state) instruction (such as SVC, LAE, et al.). I really don't understand what you mean by "no holders of the TS state are delayed unless a collision actually occurs". I didn't see anything like "delayed" associated with TS state, only "aborted". I guess "delayed" could mean that the TS code needs to be rerun and this extra CPU usage "delays" the results.
-- John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * [email protected]<mailto:[email protected]> * www.HealthMarkets.com<http://www.HealthMarkets.com> Confidentiality Notice: This e-mail message may contain confidential or proprietary information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. HealthMarkets(r) is the brand name for products underwritten and issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake Life Insurance Company(r), Mid-West National Life Insurance Company of TennesseeSM and The MEGA Life and Health Insurance Company.SM From: IBM Mainframe Assembler List [mailto:[email protected]] On Behalf Of David Cole Sent: Wednesday, September 19, 2012 7:16 AM To: [email protected] Subject: Re: The Transaction state (correction) I have to admit, Ben, you are right: Both scanners and updaters do need to be in the TS state. Sorry for the error. Still, Transactional Execution remains far better than latches/locks since (unlike with L/Ls) no holders of the TS state are delayed unless a collision actually occurs, and that would be only once in a very blue moon. Dave Cole
