> All three of the OP's scenarios involve the update of a PDS/Directory > while the information in that PDS/Directory is in a state of flux.
I don't think so. How does the ongoing execution of a program from a STEPLIB put its directory in a state of flux? Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On Behalf Of Staller, Allan Sent: Monday, January 24, 2011 6:59 AM To: IBM-MAIN@bama.ua.edu Subject: Re: Long-running jobs, PDS, and DISP=SHR <snip> I assume that the potential exposure in case 1 when adding as opposed to replacing a program is that the directory is in a state of flux involving moving entries from one block to the next (a replace would usually only rewrite a single block up update the TTR). I know that there is an EXC ENQ on a special Linkedit QNAME to serialize the updates but that only locks access to other linkedit/bind tasks). </snip> All three of the OP's scenarios involve the update of a PDS/Directory while the information in that PDS/Directory is in a state of flux. The enqueues/dequeues involved are designed to serialize the access so that a "state of flux" is not possible for the duration of the update. ---------------------------------------------------------------------- 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
