Re: FLNK doesn't process

[Ralph Lange via Tech-talk <tech-talk@aps.anl.gov>]

On Tue, 18 Jan 2022 at 12:06, William Kirstaedter via Tech-talk <tech-talk@aps.anl.gov> wrote:

[...]

we dont know whats wrong now...
(original code was without ".PROC CA" and with PREC "12")

Please note:

Targeting local FLNKs to .PROC and making them CA is only required in a few cases:

• If the target record is scanned periodically.
• If you need to override the loop protection in EPICS Base.
• If you want to avoid putting too many records in the same lock set.

The regular cases (passive target record, "normal" use case, one-to-one FLNKing) can and should use database records.

Using database records is immediate, fast, directly coupled. Basically a call to the target record's process() routine.

Using CA to the .PROC field adds queueing, delay, thread switching. Think of it as a loosely coupled triggering of the target record "in the very near future".

Cheers,

~Ralph