Experimental Physics and
Industrial Control System

That confirms how I had read the code and which was the basis for my answer.
Thanks
- T.

On 05/02/2016 05:13 AM, Michael Davidsaver wrote:

On 05/01/2016 04:57 AM, Ralph Lange wrote:

Correct.
In the congestion case, i.e. when the array data in the record gets
updated before an older event is posted, the CA server will send an
update to the client that combines the old time stamp (taken from the
queue) with the newer data (taken from the record).

 From looking at getOptions() (called via dbGet()) it looks like
type==dbfl_type_rec ignores db_field_log::time and fetches from the
record directly?  So to my understanding value, alarm, and timestamp
should *always* be consistent.

http://bazaar.launchpad.net/~epics-core/epics-base/3.14/view/head:/src/db/dbAccess.c#L371

References:

Lock/Mutex to prevent "caget" from cutting in between updating multiple fields Zhang, Dehong

RE: Lock/Mutex to prevent "caget" from cutting in between updating multiple fields Mooney, Tim M.

Re: Lock/Mutex to prevent "caget" from cutting in between updating multiple fields Till Straumann

Re: Lock/Mutex to prevent "caget" from cutting in between updating multiple fields Zhang, Dehong

Re: Lock/Mutex to prevent "caget" from cutting in between updating multiple fields Ralph Lange

Re: Lock/Mutex to prevent "caget" from cutting in between updating multiple fields Michael Davidsaver

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