Hi Lewis,
On 2012-10-12 J. Lewis Muir 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.
The threads involved have all started and are processing, but connecting CA
channels is fundamentally an asynchronous process. You wouldn't want us to
delay the completion of iocInit until all CA links in the database are
connected up; the database has no idea whether a CA link points to a local or
remote PV, it treats them all identically.
I may have removed an epicsThreadSleep() from the iocInit code in the past; I
could put one back in so you don't have to provide one yourself, but that
would unnecessarily delay IOCs that don't actually need to wait.
In your case the delay is really a requirement before doing the dbpf because
you don't want to process that calcout record until the output link has
connected. Maybe a more robust alternative might be to provide a command
which waits for a named link field to have connected, so instead of a delay
you'd use something like
dbcaWaitConnected "ioc23:PresetHistoryAdd.OUT"
but I don't know how easy it would be to implement that.
> 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.
Pausing won't help, that stops the CA server side of the IOC so requires
reconnecting. It was added to solve a completely different problem.
- Andrew
--
Never interrupt your enemy when he is making a mistake.
-- Napoleon Bonaparte
- 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 Ralph Lange
- 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
- Navigate by Thread:
- Prev:
Re: Calcout using CA output link sometimes gets INVALID severity Tim Mooney
- 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
|