Re: Best way to properly "synchronize" records between two IOCs

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

In general, there are two ways to work around the asynchronous processing side effect (returning the old value then processing):

- Use CP input links (as Mark suggested).

- Use FLNK processing.

Both are triggered at the second phase of an asynchronous processing.

Which is more appropriate depends mostly on your application. Aspects to consider:

FLNK processing is immediate (calling the process function of the target) when local, loosely coupled using Channel Access when remote.

FLNKs only transfer control; fetching data will need another Channel Access roundtrip.

With input links, you're getting notified when the connection goes away - output links are fire-and-forget.

CP inputs use monitors and will always get an update when the connection comes up - that's like a late PINI processing for the record with the input link. If a record has many CP inputs, it will process many times after reboot.

Cheers,
~Ralph