Yes, I know that but tend to forget it...
Regards, Thomas Berg _________________________________________ Thomas Berg Specialist A M SWEDBANK > -----Ursprungligt meddelande----- > Från: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] För DanD > Skickat: den 12 februari 2010 01:40 > Till: IBM-MAIN@bama.ua.edu > Ämne: Re: About ENQ - some basic questions > > There's a "gotcha" that you have to remember ... > > If you allocate a data set, ignoring existing allocations, then if the new > allocation is exclusive and the old allocation was share, the old enqueue > will be promoted to exclusive. > Then when you FREE the newly allocated data set the exclusive enqueue will > NOT be released until the original allocation is free'd. > > DanD > > -------------------------------------------------- > From: "Thomas Berg" > Subject: SV: About ENQ - some basic questions > > > Thanks! It was as I suspected, more or less. > > > > Regards, > > Thomas Berg > > __________________________________________ > > Thomas Berg Specialist IT-U SWEDBANK > > > >> -----Ursprungligt meddelande----- > >> Shmuel Metz (Seymour J.) > >> Ämne: Re: About ENQ - some basic questions > >> > >> on 02/09/2010 > >> at 04:49 PM, Thomas Berg said: > >> > >> >As I'm playing a bit with an ENQ-function, I wonder how ENQ's work > when > >> >doing dynamic allocation. > >> > >> The same as any other ENQ or RESERVE, except that you're not the one > >> issuing it. > >> > >> >Normally - as I understand - an ENQ is always released when the > >> >(sub)task terminates (or doing DEQ). > >> > >> An ENQ is release when the task owning the resource terminates. For an > >> unprivileged caller, that's the task issuing the ENQ. DYNALLOC is a > >> privileged caller, so it is more complicated. > >> > >> >But if You e g do an allocation in the same rexx its ENQ is kept thru > >> >the entire TSO session or until You free the dataset. > >> > >> More or less, except that an allocation might be marked not in use, > which > >> is sort of intermediate between allocated and unallocated. > >> > >> >Does this mean that the ENQ in this case is assigned to the main task > >> >(TSO) or is there another mechanism in work ? > >> > >> The ENQ is assigned to the Initiator task for the jobstep; that's the > >> login task for foreground TSO. > >> -- > >> Shmuel (Seymour J.) Metz, SysProg and JOAT > > > ---------------------------------------------------------------------- > 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 ---------------------------------------------------------------------- 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
