Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Wed, 21 Aug 2002 09:45:11 -0500

It's just that it doesn't seem to make much sense to pass the

'process' pointer out there - or do I miss something essential here?

I believe it's there for subroutines that want to cause asynchronous
processing - if the user subroutine sets psub->pact true before returning
because of a background I/O operation, it will need to call the record's
process() routine again when that I/O operation is complete. Passing it
into the init subroutine is simpler for the user than requiring them to
look up the process routine than using a construct that may at one time
have been
 (((struct rset*)psub->rset)->process)(psub);
which is a bit ugly and complicated if someone is new to C programming.
The cast is no longer needed, but it might have been back in the old GTACS
days.
- Andrew
--
Edsger W. Dijkstra, 1930-2002: "The use of COBOL cripples the mind;
its teaching should, therefore, be regarded as a criminal offence."

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System