Experimental Physics and Industrial Control System
Hi Ben,
On Monday 05 October 2009 15:54:33 Benjamin Franksen wrote:
> On Montag, 5. Oktober 2009, Andrew Johnson wrote:
> > I agree with Michael in favor of changing the behavior so that when a
> > client specifies COUNT=0 in its subscription, it is requesting a dynamic
> > element count such that successive events may have different numbers of
> > elements. However it should never be given more than ca_element_count()
> > elements so it can always use that number to allocate data storage at
> > connection time. If at some time in the future we want to make it
> > possible for even that number to be increased, this could be indicated to
> > the client by a pair of disconnect/ reconnect events.
>
> I would be very happy if something like this could be done at the database
> level i.e. for pv links between records.
I agree we should implement this for PV links, but I don't want to break
applications that might rely on the existing behavior (can you remember what
happens right now, do both DB and CA links zero-fill the elements beyond the
current element count?). We should probably add a new link flag to enable
dynamic sizing.
I've added this to my To Do list.
- Andrew
--
The best FOSS code is written to be read by other humans -- Harald Welte
- Replies:
- Re: Channel access and ca_element_count Benjamin Franksen
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