There is a big difference between a job allocating a proclib with DISP=OLD and a user editing a logonproc with ISPF.
The job with DISP=OLD blocks the entire proclib. ISPF issues an ENQ with DISP=SHR on the proclib and issues its own ENQ on the member with DISP=OLD. This way the library is available for other task with DISP=SHR, but the member (logonproc) is exclusively in use by the ISPF user. This works this way for decades already. Kees. -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Roger Steyn Sent: 19 July, 2016 10:20 To: IBM-MAIN@LISTSERV.UA.EDU Subject: Exclusive ENQ on a TSO logon procedure Greetings , Can somebody tell me what if a proclib containing a TSO logon procedure has got a DISP=OLD in a user submitted JCL or if somebody opens a logon procedure in ISPF edit mode and keep it that way for few hours. Will the rest of the users be able to log on using the same logon procedure while the ENQ is on ? Well , this is on z/os 2.1 and i was surprised to see the enq doesn't hold anybody from logging on using the same logon procedure while there is an exclusive ENQ . Does anyone know if this is a new feature in z/os 2.1 ? I am aware of the dynamic ENQ downgrade within a JCL having multiple steps . But the job which had a DISP=OLD in my system had only one step and it was hanging because someone had opened the logon proc in edit mode and forgot to come out of the session . TIA Roger Steyn ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ******************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ******************************************************** ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
