At 15:49 -0400 on 08/01/2006, Walt Farrell wrote about Re: Data set
ENQueues and DEQueues in Jobs:
Of course, if anyone else also has the resource with a shared ENQ,
your RET=CHNG will fail, and at that point you have no choice but to
DEQ and try again from the beginning (presumably starting with EXC
that time around).
Why is there no E->S downgrade capability? It would make life much
easier and, for example, allow the Initiator to support a DISP=OLD to
DISP=SHR change at Step Change instead of its current requirement to
treat a DISP=SHR as DISP=OLD just because a prior step had
DISP=OLD/NEW/MOD (thus postponing DISP=SHR access by other Jobs/Users
until the last step accessing the dataset is done).
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