Experimental Physics and
Industrial Control System

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

Navigate by Date:

Prev: Re: EPICS 2016 Spring Meeting at ESS, Lund, Sweden Torsten Bögershausen

Next: Alarm Server start problem and how to compile JCA on Fedora20 64 bit system ? lzfneu

Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  <2016>  2017  2018  2019  2020  2021  2022  2023  2024 

Navigate by Thread:

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

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

Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  <2016>  2017  2018  2019  2020  2021  2022  2023  2024