> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of Wayne Driscoll > Sent: Sunday, November 04, 2007 7:09 AM > To: IBM-MAIN@BAMA.UA.EDU > Subject: Re: CSA 'above the bar' > > > That is why Ed put the word common in quotes. After creating a > GETSHARED memory object, every address space that needs access to the > object must get the address of the object, and issue IARV64 with the > SHAREMEMOBJ option. And by the way, the caller must be sup > state or in > system key. So no, shared memory objects aren't the "equivalent" of > CSA, since there isn't at IPL time, a block of above the bar, that is > always available to every address space. > > Wayne Driscoll > Product Developer
Just as a thought. Could somebody write a subsystem which starts at IPL time, does the shared GETMAIN, then (here's the rub) somehow have that memory automatically added to every address space which starts thereafter? I don't know enough about subsystems. I would guess that it would be easier for said subsystem to implement a PC so that a "client" could request access to the shared GCSA (to coin a phrase for it - G for Grande, like the HLASM instructions). The PC would set up all the "difficult" parts and return a 64-bit address to the shared memory space. -- 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
