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Subject: Re: pvaSrv "can not monitor a link field"
From: Michael Davidsaver <mdavidsaver@gmail.com>
To: core-talk@aps.anl.gov
Date: Mon, 22 May 2017 19:38:15 -0400
On 05/22/2017 04:13 PM, Kasemir, Kay wrote:
> Hi:
> 
> I followed Michael's instructions from https://github.com/mdavidsaver/v4workspace/tree/pva2pva .
> Builds OK, just had to manually edit the RELEASE.local.in into a RELEASE.local, not sure if there's an automake way to handle that.
> Also couldn't find "qsrv" as such, but in the end the pva2pva/bin/linux-x86_64/softIocPVA contains a PVA server, there's no need to add anything to the st.cmd.

Look for qsrvSupport.dbd.  At the moment, the associated library is
libpdbcore.so, which as I look at it now is wrong.  I'll be changing
this to libqsrv.so soon.

The softIocPVA executable is built from softIoc.dbd and qsrvSupport.dbd.


> With that, I can monitor link fields.
> Also, not having to add anything to the st.cmd file to get the PVA server started is nice.
> So this limited test suggests replacing pvaSrv with qsrv.
> 
> Thanks,
> Kay
> 
> 
> ________________________________________
> From: Michael Davidsaver <mdavidsaver@gmail.com>
> Sent: Monday, May 22, 2017 10:58 AM
> To: Ralph Lange; Kasemir, Kay
> Cc: EPICS Core Talk
> Subject: Re: pvaSrv "can not monitor a link field"
> 
> On 05/22/2017 10:48 AM, Ralph Lange wrote:
>> Depending on what the release plans for QSRV are (@Michael?),
>> You actually might want to add this as an issue to pvaSrv.
> 
> I was just about to ask Kay if he would be willing to test QSRV,
> 
> 
>> Thanks a lot,
>> ~Ralph
>>
>> ps. We need more unit tests.
>>
>>
>>
>> On Mon, May 22, 2017 at 11:29 PM, Kasemir, Kay <kasemirk@ornl.gov
>> <mailto:kasemirk@ornl.gov>> wrote:
>>
>>     Hi:
>>
>>
>>     This came up during the V4 introduction at the recent EPICS meeting.
>>
>>     I first thought it's a bug in CS-Studio, but instead it's a
>>     limitation in pvaSrv.
>>
>>
>>     Assume an IOC with pvaSrv added to it, take any calc or ai record:
>>
>>
>>     pvget that_record
>>
>>     -> fine
>>
>>
>>     pvget that_record.INP (or INPA for a calc record)
>>
>>     -> fine
>>
>>
>>     pvget -m that_record
>>
>>     -> fine
>>
>>
>>     pvget -m that_record.INP (or INPA for a calc record)
>>
>>     -> Don't get a value, instead message(can not monitor a link field,
>>     error)
>>     monitorConnect(Status [type=ERROR, message=create dbPvMonitor failed])
>>
>>
>>     Checking the 4.6.0 release of V4, pvaSrv/src/dbPv/[3.14,
>>     3.15]/dbPvMonitor.cpp both check for link fields and refuse to
>>     monitor them with this error message.
>>
>>
>>     Fundamentally, 'camonitor' can monitor link fields, and there are
>>     some use cases for doing this:
>>
>>     Displays (EDM, CSS, ..) sometimes need to put 'INP' links on the
>>     display so that users can change the input.
>>
>>     The CSS EPCIS PV Tree tool monitors input links to show the link
>>     hierarchy.
>>
>>
>>
>>     Is monitoring link fields supported in QSRV?
>>
>>
>>     Thanks,
>>
>>     Kay
>>
>>
>>
>>
>>
> 
> 


References:
pvaSrv "can not monitor a link field" Kasemir, Kay
Re: pvaSrv "can not monitor a link field" Ralph Lange
Re: pvaSrv "can not monitor a link field" Michael Davidsaver
Re: pvaSrv "can not monitor a link field" Kasemir, Kay

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