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<== Date ==> <== Thread ==>

Subject: Delay problem in ca_array_put() command
From: Perrier Pierre <piperrier@sopragroup.com>
To: "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>
Date: Mon, 18 Jul 2011 07:45:55 +0000

Hi everybody,

 

I 'm working on a IOC or Portable CA Server capable of managing other IOC in order to sequence them, for instance. Typically this IOC controls multiple motors, each represented by an IOC.

 

I don’t know which type of implementation (Portable CA Server or IOC) is the most efficient. In this case, I started implementing an IOC. is it a good choice ?

 

More particularly, I’ve a problem with the part of this IOC acting as the client of the others IOC it controls. This client monitors  a few PV of the motor’s IOC and all seems ok. It’s a multi-threaded client. I’ve created my CA context with :

                                ca_context_create(ca_enable_preemptive_callback);

                              

And to be notified of change events, I’ve created a thread to launch :

ca_pend_event (0.0);

 

The problem occurs when I want to change a PV value. All seems ok but the pv is only really modified 30 seconds to 1 min after the call to ca_array_put (I have tested this in localhost) . To change a value, I proceed in the following manner for a double :

                               ca_array_put(DBR_DOUBLE, 1, channel, &val);

status=ca_pend_io(put_timeout);

 

Is this a normal behaviour? If not, how can this issue be solved?

 

 

Thanks in advance,

 

Best regards,

 


Pierre PERRIER

Stagiaire - MCO LIL

Sopra group.

Parc Innolin
9 rue du Golf 33700 Merignac
Phone : +33 (0)5 56 12 79 59
piperrier@sopragroup.com - www.sopragroup.com

 

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Replies:
RE: Delay problem in ca_array_put() command Jeff Hill

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