On Tue, 27 Jul 2010 09:01:46 -0500, Etienne Thijsse wrote: > >That may well be true. At this moment however, I know nothing about ISPF >services or how to call them from C. I'll keep this in mind as a lost resort, >if all >else fails.
The best I can say is that it's in the book. >At the moment I am contemplating creating a separate executable, DELMBR, >that will use remove() to delete it, thereby locking the PDSE, but when it >finishes, the PDSE is unlocked. If I use system() to call this program then >maybe the PDSE won't be locked when DELMBR finishes and fopen() >succeeds... hopefully. > Is your C program holding an ENQ SHR on the DSN? You can probe this prior to the remove() by submitting a batch job that attempts to allocate the PDSE with DISP=OLD. If you hold the ENQ SHR, then: o If system(DELMBR) runs in the same address space, it will upgrade the ENQ to EXC and leave the PDSE locked. o If system(DELMBR) runs in a separate address space, it will attempt to obtain an ENQ EXC and fail. -- gil ---------------------------------------------------------------------- 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
