DALOCK & 7.10.G1

[Chris Sharman]

>I *do* have problems with the 7.10.G1 version of DALOCK - so much so that I've
>started linking using 7.10.F3 again - no word from telesupport yet.
>DA_INIT_LOCK appears to corrupt data after the ph_lck structure in memory
>(documented at 62 bytes). There's also no lock id, and the name appears to be
>displaced down the structure. I'm not sure whether it's a compilation/linking
>problem or what.

Thanks to Allison Hamilton: no problems this morning after I expanded the ph_lck
structure as she suggested (to 68 bytes).

Is this expansion accidental, or is there a new structure to be documented ?
Examination via the debugger showed me a lock status of %rms-s-ok_dup, no lock
id, and ss$_normal return status.

>Quick & QTP are installed with SYSLCK priv - I always assumed so that they
>could synchronise clusterwide. But no: the locks they take out are ordinary UIC
>group-specific locks, so there's no synchronisation across UIC groups, which I
>find rather disturbing.

I'm still concerned about the whole synchronisation issue though: Quick
definitely takes group locks, so it can't be doing system-wide synchronisation.

It really ought to be doing system-wide locking, or (better) using
$set_resource_domain to use a UIC-independent domain without requiring
privilege.

DALOCK should too, which would mean calling it with appropriate privileges.
I'd be unwilling to give SYSLCK to all users, or installing all the calling
applications, which would mean wrapping it up in a privileged shareable image
and calling the routines (at least da_init_lock) from exec mode: would that be
possible ?
______________________________________________________________________
Chris Sharman			Chris.Sharman@CCAgroup.co.uk
CCA Stationery Ltd, Eastway, Fulwood, Preston, Lancashire, PR2 9WS.
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