Subject: |
Re: Calcout using CA output link sometimes gets INVALID severity |
From: |
Ralph Lange <[email protected]> |
To: |
EPICS Tech Talk <[email protected]> |
Date: |
Fri, 12 Oct 2012 18:21:58 +0200 |
On Fri Oct 12 2012 17:45:33 GMT+0200 (CEST), J. Lewis Muir
<[email protected]> wrote:
> Yes, inserting the delay makes the problem go away.
>
> But this seems like a bug to me. Isn't the IOC supposed to be
> in the "running" state after iocInit completes? I would expect
> this to mean that any threads related to CA link processing have
> completed starting and are in a state ready to service CA
> requests. I would not expect to have to insert epicsThreadSleep
> calls after iocInit to make things work.
>
> Also, I don't know exactly how the pause and run stuff works,
> but if the IOC is paused and then run again at a later time,
> will the same problem occur? If so, I guess I'd have to add a
> delay on coming out of the paused state to ensure my record will
> process correctly. That would be pretty lame.
You might consider moving your functionality into a SNL state machine.
By default, the sequencer waits for all CA connections to be up before
starting a state set. That seems to be a better fit for your problem.
As for the IOC startup: consider a typical IOC with 1000s of CA
connections, and a few typing errors in link target names. Such an IOC
would almost never start.
Or, how hard it would be to start up the control system after a power
outage, if every IOC waits for all other IOCs to be up first.
Cheers,
~Ralph
- Replies:
- Re: Calcout using CA output link sometimes gets INVALID severity J. Lewis Muir
- References:
- Calcout using CA output link sometimes gets INVALID severity J. Lewis Muir
- Re: Calcout using CA output link sometimes gets INVALID severity Andrew Johnson
- Re: Calcout using CA output link sometimes gets INVALID severity J. Lewis Muir
- Navigate by Date:
- Prev:
Re: Calcout using CA output link sometimes gets INVALID severity J. Lewis Muir
- Next:
Re: Calcout using CA output link sometimes gets INVALID severity Andrew Johnson
- Index:
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
<2012>
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
- Navigate by Thread:
- Prev:
Re: Calcout using CA output link sometimes gets INVALID severity J. Lewis Muir
- Next:
Re: Calcout using CA output link sometimes gets INVALID severity J. Lewis Muir
- Index:
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
<2012>
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
|