Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Wed, 24 Nov 2010 14:27:44 -0700

> It seems overly restrictive to include the whole lock-set, there can 
> be multiple non-overlapping putNotify groups within the same lock-set 
> since nowadays we do not allow an NPP+NMS link to break a lock-set into 
> two.

What are the potential negatives of restricting only one put notify request to be active, while at the same time allowing several put notify requests to be pending initiation, within an entire lock set.

Jeff
______________________________________________________
Jeffrey O. Hill           Email        [email protected]
LANL MS H820              Voice        505 665 1831
Los Alamos NM 87545 USA   FAX          505 665 5107

Message content: TSPA

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are going to land, and it could be dangerous sitting under them
as they fly overhead. -- RFC 1925

> -----Original Message-----
> From: Andrew Johnson [mailto:[email protected]]
> Sent: Wednesday, November 24, 2010 1:21 PM
> To: Jeff Hill
> Cc: 'Benjamin Franksen'; [email protected]
> Subject: Re: ca_put_callback once again
> 
> On Wednesday 24 November 2010 13:52:16 Jeff Hill wrote:
> >
> > Is it possible to know when initiating a put notify if a put notify
> is
> > already pending in any part of the processing chain that it is being
> > initiated, and if so, chain initiation of a subsequent put notify to
> > completion of the pending put notify? My naive understanding is that
> all
> > records in the same processing chain share a single lock set lock,
> and also
> > a single put notify queue?
> 
> As currently implemented the putNotify subsystem is fully dynamic, it
> doesn't
> know what records will be processed until they are.  I don't see any
> easy way
> to change that since there might be record types such as the seq,
> fanout or
> dfanout where we can't know in advance which links will be processed
> (the SELN
> field value selects one or more links in some modes), and some records
> might
> be disabled using SDIS anyway.  It seems overly restrictive to include
> the
> whole lock-set, there can be multiple non-overlapping putNotify groups
> within
> the same lock-set since nowadays we do not allow an NPP+NMS link to
> break a
> lock-set into two.
> 
> - Andrew
> --
> If a man is offered a fact which goes against his instincts, he will
> scrutinize it closely, and unless the evidence is overwhelming, he will
> refuse to believe it.  If, on the other hand, he is offered something
> which affords a reason for acting in accordance to his instincts, he
> will accept it even on the slightest evidence.  -- Bertrand Russell

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System