On 25 March 2010 10:05, GOODWIN, DIANE M. <[email protected]> wrote:
> I have been trying to find info on how to use the subpools - but > it seems like 2 pages in one manual and then 3 in another. Does anyone > know if there is a someplace I can find information on how to use this > properly? Things like - what state does the program need to be in - > problem or supervisor? Any other gotchas like that. The whole notion of subpools has a lot of historical baggage. The default subpool is 0. For subpools 0 and 1-127, the subpool number is pretty much used only to organize storage, and to allow the freeing of all storage in a given subpool with one call to FREEMAIN or STORAGE RELEASE. For higher number subpools, the number carries additional information, which in some cases can also be specified directly on the GETMAIN or STORAGE OBTAIN. For example, subpool 241 is always in common storage (CSA), and by default has the caller's key, but you can specify the key you want on the request. There are unexpected subtleties and oddities - for instance if a caller in supervisor state and key 0 requests subpool 0, instead storage of subpool 252 is assigned. Keep in mind that it is also possible to modify certain attributes of your storage after you have obtained it from the system. The best reference for subpools is in the MVS Diagnosis Reference, in the section System Reference->Storage Summary->Storage Subpools. There is a chart, and a set of useful notes, including one on how storage keys relate to the caller's PSW key. The number of footnotes gives you an idea of how many oddities there are. Tony H. ---------------------------------------------------------------------- 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
