Experimental Physics and Industrial Control System

Does this mean that the records with unchanged data but new timestamps 
will post monitors to subscribed clients on each 'update'? That would 
potentially introduce a lot of unnecessary/unwanted CA traffic.

    --- rod.


On 2/28/19 11:15 AM, Mark Rivers via Tech-talk wrote:
> 
> 
> 
> ________________________________
> From: Mark Rivers
> Sent: Thursday, February 28, 2019 12:35 PM
> To: Joao Afonso
> Subject: Re: asynDriver - update record (timestamp), on no change
> 
> 
> Your proposed hack is indeed the workaround for now.  It would be nice to add another way to do this, perhaps forceParamCallback(addr, param).
> 
> 
> Mark
> 
> 
> 
> 
> ________________________________
> From: [email protected] <[email protected]> on behalf of Joao Afonso via Tech-talk <[email protected]>
> Sent: Thursday, February 28, 2019 11:16 AM
> To: [email protected]
> Subject: asynDriver - update record (timestamp), on no change
> 
> Hello,
> 
> I have an asyn driver IOC that periodically receives new data, updates the parameters (and timestamps), and runs the callbacks for the "I/O Intr" records.
> 
> It has an extra thread that runs something like this:
> 
> while(1)
> {
>      int value = wait_for_data();
>      setIntegerParam(dev_addr, param_id, value)
>      updateTimeStamp();
>      callParamCallbacks(dev_addr);
> }
> 
> However, 'callParamCallbacks' will not update the record timestamp if the value received keeps being the same.
>  From what I understand, this is the intended behaviour of asynDriver - no updates if data is the same -, but I would like to know if there a way to enforce it (to update the record timestamp)?
> 
> One possible solution I think will work is to update the parameter with a random value first, to trigger the 'new data' flag, but it feels like an hack...
> 
> Example:
> setIntegerParam(dev_addr, param_id, 0)
> setIntegerParam(dev_addr, param_id, value)
> 
> 
> Thank you,
> Joao Afonso
> 

Replies:

Re: Fw: asynDriver - update record (timestamp), on no change Ralph Lange via Tech-talk

References:

asynDriver - update record (timestamp), on no change Joao Afonso via Tech-talk

Fw: asynDriver - update record (timestamp), on no change Mark Rivers via Tech-talk

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