Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Fri, 28 Sep 2012 11:06:29 -0500

Hi Jim,

On 2012-09-28 Jim Chen wrote:
> 
> The problem is that I need to retrieve this string in the aSub Init
> routine, as it states here: field(INAM,"myfunctionInit"). At that point,
> the stringout record might not be processed yet.

It doesn't need to be processed, its VAL field already holds the string that  
you want.  The issue you're having though is that the aSub record doesn't read 
its input links before calling your init() subroutine, so you can't expect to 
see a value in prec->a until your process() subroutine gets called later.

> I suppose the PP key is
> to force the other record to be processed afterwards. Even when I set the
> stringout record PINI=1, and place it before my aSub record. This comes to
> another question, what is the order when the database records are read and
> initialised?

The order of initialization of records at iocInit() is not documented, so it 
can change in the future.  Currently all records of one type get initialized 
together before moving onto the next type, and the order of the record types 
is controlled by their order in the DBD file that the IOC loads.  Within each 
record type it looks like the records will get initialized in alphabetical 
order, using strcmp() to determine that order, but I wouldn't rely on that 
staying the same for ever.  All records get initialized before any get 
processed though.

HTH,

- Andrew
-- 
Never interrupt your enemy when he is making a mistake.
-- Napoleon Bonaparte

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System