Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Tue, 06 Jul 2010 14:37:22 -0000

On Monday 05 July 2010 03:02:23 Dirk Zimoch wrote:
>
> * BPTR must not change at run time (e.g. no double buffering). I have to
> check what devExtend() does to solve this problem.

Sorry, devExtend() is the way that a device support tells the iocCore code 
that it can accept address changes at runtime; it doesn't solve that problem.  
The devExtend() routine must be called from a dset->init() routine and points 
to a dsxt structure with the add_record() and del_record() routines that 
support those runtime changes for this device support.  My point was merely 
that if BPTR can't be changed after rset->init_record(0) returns [presumably 
because this somehow stops DB links from working] that it's not going to be 
possible to have extended device support that sets BPTR.  Not a major issue, 
and there are no incompatibilities here.

> I kept the memory allocation model to stay compatible to old device
> supports. Additionally I allow for new device supports not to set BPTR.
> Also to stay compatible, I do not want to switch from BPTR to VAL.

I agree that this is the best solution for now.

Thanks,

- Andrew
-- 
The best FOSS code is written to be read by other humans -- Harald Welte

https://code.launchpad.net/~dirk.zimoch/epics-base/fix-aai-and-aao/+merge/26195
Your team EPICS Core Developers is requested to review the proposed merge of lp:~dirk.zimoch/epics-base/fix-aai-and-aao into lp:epics-base.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System