Hmm, I took your example job and added a step inbetween your two and put
the job to sleep for 30 seconds.
The SYSTSPRT output looked like this:
READY
FREE DD(SYSUT1)
READY
FREE DD(SYSUT1)
IKJ56247I FILE SYSUT1 NOT FREED, IS NOT ALLOCATED
READY
END
Going to sleep for 30 seconds
14:05:52.270727
14:06:22.280007
READY
END
READY
FREE DD(SYSUT1)
READY
FREE DD(SYSUT1)
IKJ56247I FILE SYSUT1 NOT FREED, IS NOT ALLOCATED
READY
END
But for that 30 seconds, I was unable to edit the SYSUT1 data set -
"Data set in use". The ISPF Data Set Contention panel showed my batch
job "owns data set exclusively."
Greg Shirey
Ben E. Keith Company
-----Original Message-----
From: IBM Mainframe Discussion List On Behalf Of Paul Gilmartin
Sent: Friday, May 25, 2007 1:49 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: Why is there JOB scope for DSN ENQ's anyway?
Apparently the initiator is up to the task, easy or difficult.
The JCL fragment:
//*
//STEP1 EXEC PGM=IKJEFT01
//SYSUT1 DD DISP=OLD,DSN=FOO.BAR,
// UNIT=SYSALLDA,VOL=SER=TSO001
//SYSTSPRT DD SYSOUT=(,)
//SYSTSIN DD *
free dd(sysut1)
free dd(sysut1)
//*
//STEP2 EXEC PGM=IKJEFT01
//SYSUT1 DD DISP=OLD,DSN=FOO.BAR,
// UNIT=SYSALLDA,VOL=SER=TSO001
//SYSTSPRT DD SYSOUT=(,)
//SYSTSIN DD *
free dd(sysut1)
free dd(sysut1)
//*
produces SYSTSPRT from STEP1
READY
free dd(sysut1)
READY
free dd(sysut1)
IKJ56247I FILE SYSUT1 NOT FREED, IS NOT ALLOCATED
READY
END
... and SYSTSPRT from STEP2
READY
free dd(sysut1)
READY
free dd(sysut1)
IKJ56247I FILE SYSUT1 NOT FREED, IS NOT ALLOCATED
READY
END
... so even though FOO.BAR was FREEd in STEP1, the initiator
was able to allocate it again in STEP2. I hope this was
not done without an ENQ. Whatever technique the initiator
used here, it could use the same technique to differentiate
an EXC from A SHR ENQ.
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