Subject: |
Re: Lock/Mutex to prevent "caget" from cutting in between updating multiple fields |
From: |
Michael Davidsaver <[email protected]> |
To: |
[email protected] |
Date: |
Mon, 2 May 2016 08:13:30 -0400 |
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
- Replies:
- Re: Lock/Mutex to prevent "caget" from cutting in between updating multiple fields Till Straumann
- 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
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