CMS in a virtual machine for an end user is much the same as always. Single tasker single user real storage. Of course there have always been extension, like TCPIP, etc. A CMS end user does not have background/foreground like a linux user.
The Reusable Server Kernel (RSK) provides a rich set of multitasking apis. Dave Jones and I have a POP3 server that uses the RSK. The IBM HCD/HCM is another product that sits on top of the RSK. There's an multitasking library. Your memory is correct. GCS was hybrid of CMS file system, crippled command interface, enhanced OS macro support, and quite important shared writable storage so VTAM, RSCS, Netview, AVS, VSCS could all happily update buffers, ACBs, all sorts of stuff necessary to implement a multithread shared storage program like VTAM. David -----Original Message----- From: Linux on 390 Port on behalf of Mark Post Sent: Thu 10/11/2007 4:43 PM To: [email protected] Subject: Re: Linux guest to manage zVM? >>> On Thu, Oct 11, 2007 at 4:29 PM, in message <[EMAIL PROTECTED]>, Coffin Michael C <[EMAIL PROTECTED]> wrote: > I guess the distinction is that VM/CP is multitasking, and CMS (the > "shell" in Linux-speak) is not (necessarily, unless you are running > processes that take advantage of the services Dave mentioned). Ok, so which is it? Is CMS capable of running multitasking programs, or not? Way back when, GCS was introduced so that certain IBM products could run in a multitasking environment, because that wasn't possible with CMS. (I believe it was VTAM, but I'm not at all sure about that.) What has changed/what is necessary for CMS to run native multitasking programs today? I'm not looking for an in-depth tutorial here, but I do want to understand the current capabilities and limitations of CMS so I don't go spreading misinformation. Thanks, Mark Post ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
