Experimental Physics and
Industrial Control System

Dirk Zimoch <[email protected]> · Mon, 23 May 2011 10:18:11 +0200

[...] One exception frequently cited is when
starting an IOC its maybe ok, but if this occurs in common library code then
it's probably going to be used inappropriately in other situations, and
surely eventually we will need to upgrade allowing online add and delete of

records and then it's less clear when iocInit starts and ends?

This show why C++ exceptions are better than the good old C abort(). If

creation of a new record fails because of insufficient memory, an

exception can be thrown. During run-time it should be caught and an

error should be reported to the user that the record can't be added to

the system. During initialization, it may be acceptable not to catch the

exception which will in the end call abort(). Thus the application

developer and not the support library developer decides if the

application (here the ioc) must die or not.

By the way, if creation of a record fails because of a typo in a

template file, the ioc happily continues starting up, but with one or

many records missing -- even though this *is* a programming error, not a

run-time problem.

Dirk

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System