Johnny, Your knowledge is pretty much correct. In answer to your question about attributes of a module after it is loaded into storage, they are maintained in the LPDE (Link Pack Directory Entry) for the module. However, even though the LPDE contains a RENT indicator (as it is basically a specialized CDE), if the module is in the LPA, only one copy, loaded into KEY 0 storage, will be used, so if the program must be reentrant, or problems could (or will) occur.
Wayne Driscoll Product Developer JME Software LLC NOTE: All opinions are strictly my own. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Johnny Luo Sent: Wednesday, August 22, 2007 8:16 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: LPA Module Size 80MB impact on system? Interesting. From my little knowledge, there are (only?) two places where AC(1) matters: 1. EXEC PGM=XXX If the module is from a APF lib and with AC(1), JSCBAUTH will be set on which means the whole job step will run in APF-authorization status. 2. ATTACH RSAPF=YES The same logic is used to reset JSCBAUTH. Before doing this, JSCBAUTH needs to be set off if it's already on. And the caller must be in supervisor state or system key. As for the above example, since the module is in LPA which means it'll be treated as having been loaded from an APF lib, it can be invoked by an APF-authorized job step. Unless it's invoked via ATTACH RSAPF=YES, AC code doesn't matter. However, is the module in LPA also treated as having AC(1)? I'm not sure. And it makes me think of another question: After a module is loaded into JPA, is the information of this copy (whether it's from an APF lib and its AC code) stored in some system control blocks? My guess is yes. If the module is RENT, the same copy will be reused. So the info must be stored somewhere. -- Best Regards, Johnny Luo ---------------------------------------------------------------------- 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
