Experimental Physics and
Industrial Control System

Benjamin Franksen <[email protected]> · Tue, 10 Mar 1998 16:17:10 +0100

Hello Marty,

Ralph told me that you accept proposals for changes in record types and
supports until the 20th of March. Here is one:

The bo record has a field HIGH which - if set to a value other than zero
- re-processes the record whenever it has been processed with VAL field
set to one. This is unfortunate in case the bo record does the usual
conversion (zero to zero, non-zero to MASK). What one expects in this
case is - I'd say - that the re-processing with zero happens whenever
the record is processed with a value other than zero.

Concrete: replace the two occurrences of 

        if (pbo->val==1 && wait_time>0) {

with

        if (pbo->val && wait_time>0) {

Another way to achieve the same result - a more radical way - would be
to convert VAL to zero or one _always_ on entry to process() resp. when
VAL is retrieved, independent from any device specific conversion.
Perhaps the most radical solution would be to introduce some DBF_BOOLEAN
data type which is then automatically converted, but this would probably
go a bit too far...

        Ben
-- 
The Notorious Neb Nesknarf
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System