> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:ibm-m...@bama.ua.edu] On Behalf Of Gerhard Postpischil > Sent: Tuesday, November 03, 2009 1:24 PM > To: IBM-MAIN@bama.ua.edu > Subject: Re: asynchronous file open?
<snip> > > It's fairly simple to do, providing you're willing to abandon > system access methods. In authorized code (program, PC routine, > or SVC) you can issue I/O at will, although it's preferable if > you allocate the device first (if it's other than DASD), and are > aware of potential error and recovery situations. To get system > support for routine error recovery, DDR, and output on dumps, it > helps to build a DEB, DCB, and IOB, make sure the pointers are > consistent, etc. All I/O can be carried out by system routines > (STARTIO, EXCPVR, EXCP, XDAP) and is fairly simple once you get > it working. Requests are made with ECBs, so you can choose > whether or not to wait, use a subtask, etc. A simple ECB option > on OPEN might be insufficient, as you'd presumably also want the > option on EOV and CLOSE? > > Gerhard Postpischil > Bradford, VT Good point! Well, once I'm doing I/O, I can do it asynchronously. And I think that will be OK for EOV processing as EOV is done within the BSAM call, which I have being done asynchronously. But an ECB on CLOSE might be needed as well. I was trying to avoid using multitasking "just because". But that would likely be the simpliest way. And would probably result in more modular, simplier code too. -- John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * (817)-961-6183 cell john.mck...@healthmarkets.com * 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 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
