Re: More Ganssle on Ada

[Marc C <mc.provisional@gmail.com>]

On Saturday, January 19, 2013 3:17:05 PM UTC-6, sbelm...@gmail.com wrote:

> I've had the displeasure of maintaining a lot of legacy code, ostensibly
> written in Ada

I feel your pain.

I was porting a fairly large Ada 83 system where each subsystem had a typical I/O and processing flow:

- Task to monitor a socket and put messages on a queue.
- Task that implemented the incoming message queue
- Task pulling messages off the queue, processing them, and putting any new messages on a queue.
- Task implementing the outgoing queue.
- Task to monitor the queue and write messages to a socket.

Fairly pedestrian architecture, yes? Hard to mess this up, eh?

*Every rendezvous was within an accept block.*

Essentially you wound up with the World's Most Expensive Procedure Calls (tm).

By the time the port was done I had run across only two task types whose instances were actually executing concurrently with other processing.

This system is now retired.

Marc A. Criley