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<== Date ==> <== Thread ==>

Subject: put callback queuing
From: Daron Chabot <daron.chabot@gmail.com>
To: EPICS <tech-talk@aps.anl.gov>
Date: Thu, 21 Jun 2012 10:50:40 -0400
Hi,

Recently at BNL, we've been investigating a report of unexpected
behavior found when using put-callbacks to a Motor Record (verified
using a simulated motor). After initiating a long-running motion with

caput -c -w 100 test:motor1 <some large value>

trying to stop the motor in the following way fails:

caput -c -w 100 test:motor1.STOP 1

After observing that the 2nd put-with-callback to stop the motion is
not seen by the Motor Record, a look through
$EPICS_BASE/src/rsrv/camessage.c reveals that concurrent put notifies
are queued in the IOC server:

/******************************/
if ( pciu->pPutNotify ) {

        /*
         * serialize concurrent put notifies
         */
/******************************/

I can understand serializing put-callbacks on a per-channel basis, but
the implementation appears to serialize _per-record_.

What am I missing? A little help please...


-- dc

Replies:
Re: put callback queuing Andrew Johnson
Re: put callback queuing Tim Mooney

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