ENQ and DEQ macros...

girishms · New User Joined: 06 Jun 2008 Posts: 22 Location: chennai

Hi all...

Has anybody worked on ENQ and DEQ macros in assembler???

If so please guide me....

Thanks,
Girish

Bill Dennis · Posted: Thu Jul 24, 2008 6:43 pm Post subject:

ENQ uses a QNAME,RNAME pair of values to serialize access to a shared resource, so everyone must use the same values to protect the same resource. The scope of the ENQ is also important (STEP, SYSTEM, SYSTEMS) as well as shared vs. exclusive.

You can test the availability of an ENQ, attempt ENQ with error returned if unavailable, or wait unconditionally for an ENQ.

For example, ISPF EDIT uses QNAME=SPFEDIT and RNAME=data.set.name[and.member?] , scope SYSTEMS and exclusive.

The MVS Assembler Services Reference manual describes the macros and has simple examples.

girishms · New User Joined: 06 Jun 2008 Posts: 22 Location: chennai

Thanks a lot !!!!

dbzTHEdinosauer · Posted: Fri Jul 25, 2008 4:19 am Post subject: Reply to: ENQ and DEQ macros...

Bill,

that was a great little post.

they still have RAGBRAI every year about this time?
I did it from 1986 thru 92.
I am safe now, the wife is gone and I am in europe.

Bill Dennis · Posted: Fri Jul 25, 2008 6:53 pm Post subject:

Dick,
RAGBRAI is running this week! I'm not a rider but they seem to have a good time. Someone spread tacks on the road this year and caused a bunch of flats.

Follow the action HERE