Re: Record Locks

["Steve Landess" <sjl_123@xxxxxxxxxxx>]

> James LowAry wrote:
> If in ILE program you specify on a Chain (N) to not lock the record on a
Update file.
> Is this treated as a Read with Lock then an immediate UnLock, >or as it
would be in a
> none Update situation (can you read the record if it is locked by another
job)?
>
> I'm assuming the first one would be the way it would happen.
> (IE: if you chained to a record and it was locked, the chain would fail
after waiting for
> the appropriate time-out, even though you specified NoLock)
> Since the ODP would be opened for Update you would still need a free and
clear
> record, or is there some magic under the covers and it would treat
> that requests a just Input request, not a Update request.

James,
What I generally do to test scenarios like this is just write some code.

1) Define the file in PGMA as Update Full-Procedural and CHAIN to a known
record
so that it is locked.  Put a DSPLY operation in this program and make it
stop right
after the CHAIN has executed.  Leave this program running at the DSPY
operation.

2) In another interactive session, in PGMB define the same file as Update
Full-Procedural
and CHAIN(N) to the same record as PGMA.

This will show you the actual behavior of the file manager with very little
effort.
If you get an error on the CHAIN(N) operation in PGMB, you'll know that
CHAIN(N)
is doing a Read with Lock.

HTH,
Steve Landess
Austin, Texas
(512) 423-0935