> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of Paul Gilmartin > Sent: Monday, January 21, 2008 11:11 AM > To: [email protected] > Subject: Re: How does ATTACH pass address of ECB to child? > > > On Sun, 20 Jan 2008 11:09:57 -0800, Edward Jaffe wrote: >
[snip] > > And might IBM designers choose to convert to YA seriaization > technique in WAIT/POST (PLO?), rendering the customer and ISV use > of CS invalid? I recognize this would be very difficult to do > in the existing marketplace, but it would transgress no commitment > in the absence of documentation stating that such use of CS is a > supported interface. Remember the "provided". > [snip] > > -- gil Gil, Interesting question. I understand the PLO argument, but I think that CS and its family will still work, regardless of how IBM implements the WAIT/POST logic. Unless I am totally understanding the following, from the POPS: <quote> When an equal comparison occurs, the third operand is stored at the second-operand location. The fetch of the second operand for purposes of comparison and the store into the second-operand location appear to be a block-concurrent interlocked-update reference as observed by other CPUs. ... A serialization function is performed before the operand is fetched and again after the operation is completed. </quote> Indicates, to me, that a PLO or any other instruction being executed on another CPU will still see the atomic results of the CS instruction. -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology The information contained in this e-mail message may be privileged and/or confidential. It is for intended addressee(s) only. If you are not the intended recipient, you are hereby notified that any disclosure, reproduction, distribution or other use of this communication is strictly prohibited and could, in certain circumstances, be a criminal offense. If you have received this e-mail in error, please notify the sender by reply and delete this message without copying or disclosing it. ---------------------------------------------------------------------- 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
