Experimental Physics and
Industrial Control System

Tim Mooney <[email protected]> · Fri, 20 Feb 2009 13:01:10 -0600

And "YUP", I suppose, to specify both YES and UP?

Tim

Ralph Lange wrote:

Good points.

I didn't think about external CA links, though.

As nowadays using CA/CP links is the only way to link records without

forcing them into the same lock set, it's a pity that this doesn't work

for PINI processing.

Idea: Why not introduce an additional PINI sweep, and change the PINI

field to be a three-option choice?

"NO", "YES", "UP": NO and YES yield the classical behaviour, while "UP"

puts the record into the second PINI phase, that runs *after* the CA

client and server are started (I.e., when the IOC is UP).

Should be compatible, shouldn't break existing stuff, allows CA/CP in

PINI processing.

For the Redundant IOC , it has the interesting side effect that you can

select if the record should be processed at boot time, or after the IOC

has become active.

(If the IOC switches back and forth between active and inactive, would

UP records be processed whenever it gets active? Do we need to

distinguish between "Once UP" and "Whenever UP"?)

Ralph

On 18.02.2009 16:59 Andrew Johnson wrote:

On Wednesday 18 February 2009 06:56:57 Ralph Lange wrote:

This sounds like a fix could be feasible and/or an issue on Andrew's
list, doesn't it?

Unfortunately I just realized that doing so would break the Redundant

IOC interface. Those xxxRun() calls are in iocRun() whereas the

initialProcess() call is in iocBuild(), so in a redundant IOC the PINI

processing happens at start-up but the CA links don't get connected

until the redundancy executive says "go" (which could be weeks or even

months later). I'm not sure if the initialProcess() call could/should

be moved, but doing so would change the meaning of some of our initHooks.

The other thing that worries me is that I think the act of connecting

up the CA links probably also enables any CP or CPP input links to

start processing, so it's possible that they could pre-empt the PINI

processing (especially if they're pointing at an external IOC which is

already running).

- Andrew

--
Tim Mooney ([email protected]) (630)252-5417
Beamline Controls & Data Acquisition Group
Advanced Photon Source, Argonne National Lab.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System