Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Mon, 18 Jan 2016 10:08:08 -0600

On 01/16/2016 12:14 AM, Zhang Yuliang wrote:
> The reason of refreshing BOY OPI dynamically is I found that BOY
> runtime OPI can not update my C# type EPICS PV's access rights. For
> example, 1) if the PV' access right is r+w, run the OPI and it can
> change the PV's value using 'Text Input' widget;  2)if the PV's
> access right is readonly, run the OPI and  re-change PV's access
> right to r+w, PV's value can not be changed using 'Text Input' unless
> refresh OPI once.

The correct thing to do here would be to fix the C# version of the CA
server software so it correctly sends out a CA_PROTO_ACCESS_RIGHTS
message to all affected clients whenever the righs for a channel are
modified (I'm assuming that the CSS BOY client sets up an access rights
callback for each of its connected channels). If the problem is in the
server and isn't fixed you could end up having to make similar kludgy
fixes to other CA clients in the future.

- Andrew

-- 
There are only two hard problems in distributed systems:
  2. Exactly-once delivery
  1. Guaranteed order of messages
  2. Exactly-once delivery
 -- Mathias Verraes

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System