Experimental Physics and
Industrial Control System

Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov> · Wed, 28 Sep 2022 13:12:39 -0700

On 9/28/22 11:18, Alnajjar, Dawood via Tech-talk wrote:

Hi Everyone,

I need to change a PVA structure dynamically during IOC operation. Looking at pvxs::ioc::server, I do not see an update function that allows that. Does anyone know if this is possible?

Type change w/ PVA and CA protocols is accomplished by force disconnecting clients
of a PV, which can then be given a different type when they reconnect.

With the PVXS library, the SharedPV::close() method does the disconnecting,
so that a subsequent SharedPV::open() can provide a different type.
The same can be done with the pvAccessCPP library.

https://mdavidsaver.github.io/pvxs/sharedpv.html#_CPPv4N4pvxs6server8SharedPV5closeEv

That said, you mention "ioc" so you may be referring to QSRV.  The process database
(aka. records) does not current have a concept of type change after records have
been loaded.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System