John,
They both wind up going to the same place, eventually. The ENQ/DEQ
SVC's execute a Program Call into the GRS address space, as part of SVC
processing. ISGENQ gets there in what appears to be a more straight forward
fashion. It sets up the parameter list, and then PC's into GRS. No SVC
interrupt handling and such. This is what I have seen when comparing the
two in system trace table entries.
--Dave
----- Original Message -----
From: "McKown, John" <[email protected]>
Newsgroups: bit.listserv.ibm-main
To: <[email protected]>
Sent: Wednesday, January 18, 2012 9:21 AM
Subject: New code? use ENQ/DEQ or ISGENQ?
I am writing some new code. It is a z/OS UNIX command, and so I feel that
using "old" facilities for backwards compatability is not really an issue.
Just as I have heard people say that using STORAGE OBTAIN/RELEASE is
"better" than GETMAIN/FREEMAIN, is using ISGENQ OBTAIN/RELEASE "better"
than using ENQ/DEQ? It does appear to have some nice enhancements over
ENQ/DEQ for the "average" (non authorized) user.
--
John McKown
Systems Engineer IV
IT
Administrative Services Group
HealthMarkets(r)
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