Re: Severity of I/O interrupt records

[Dirk Zimoch <dirk.zimoch@psi.ch>]

Hi all,

Unfortunately, Emma is wrong. Because of the way how %(myRecord.fieldName) is 
implemented, myRecord is never processed when the read does not succeed. I just 
don't get to the point to find out about myRecord when there is no input to parse.

Also forwarding connection problems to I/O Intr records is not don in 
StreamDevice yet. Because it is not supported by asyn, I would have to add a yet 
another hack and have my own list of I/O Intr connected to any particular asyn 
port/address. That is something I can probably do.

Dirk

Shepherd, EL (Emma) wrote:
> Hi Stephen,
>
> One thing you could do is to change your implementation slightly.  Make
> your I/O interrupt records Passive, and change your protocol to
> explicitly map each part of the message to the required records using
> the "%(myRecord.fieldName)" syntax of format converters.
>
> I'm fairly sure this should make the records go invalid if communication
> fails... but someone correct me if I'm wrong.
>
> Emma
>
> > -----Original Message-----
> > From: tech-talk-bounces@aps.anl.gov 
> > [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of Schuh, Stephen
> > Sent: 18 March 2008 20:27
> > To: tech-talk@aps.anl.gov
> > Subject: Severity of I/O interrupt records
> >
> >
> > I am using streamdevice to communicate with a VME crate 
> > controller.  One record sends a query string to the crate and 
> > receives a string as a reply.  The reply string contains a 
> > lot of information and needs to be mapped to several records. 
> >  The records that receive this information are all 
> > streamdevice records with I/O interrupt processing.  This all works.
> >
> > My problem is that I want the severity of all the I/O 
> > interrupt records to be set to invalid if there is a problem 
> > with the communication to the crate.  The record that sends 
> > the query string has invalid severity in this case.  Can 
> > anyone suggest a nice way to propagate that invalid severity 
> > to all the I/O interrupt records?  I thought about disabling 
> > the records, but I think I would need to process the records 
> > to make this work, and I don't know how to cause I/O 
> > interrupt records to process.  Is there an asyn option that 
> > will cause I/O interrupt records to process after a 
> > connection problem?
> >
> > thank you,
> > Stephen
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--
Dr. Dirk Zimoch
Paul Scherrer Institut, WBGB/006
5232 Villigen PSI, Switzerland
Phone +41 56 310 5182