Re: Focus deadlock

["Specht, Eliot D." <spechted@ornl.gov>]

Mark, Pete,

 

I do not need to run the IOC to get a problem: just MEDM is enough.

If I start MEDM, start Winteracter, stop MEDM, the focus deadlock continues.

If I run medm pilatusDetector.adl without “-x” (is this edit mode?) I still get a focus deadlock.

Tried running a few other MEDM applications and generally saw the same problem.

 

Eliot Specht       

 

Subject:               Re: Focus deadlock

From:    Pete Jemian <jemian@anl.gov>

To:          <tech-talk@aps.anl.gov>

Date:     Fri, 24 Oct 2014 12:29:37 -0500

That's the real test.  ... stop MEDM and see if problem continues.

Another test is, with MEDM and Winteracter application both running, stop the IOC and see if the focus stops switching.

 

Seems that an experienced Motif programmer might understand how this interaction is even possible.

 

You asked:

> What kind of events are created by the EPICS system which

> could be picked up by an application which is not EPICS-aware?

 

MEDM receives CA monitor updates and converts some of those updates into updates to its Motif interface. These updates in MEDM are the path, however remote such a possibility exists, that Motif events from MEDM are being received by your Winteracter application.

 

On 10/24/2014 11:46 AM, Mark Rivers wrote:

Hi Eliot,

 

If you stop medm from processing events by putting it in edit mode does the problem immediately stop?

 

If you kill medm and run another EPICS Motif CA application (probe, stripTool, etc.) do you have the problem?

 

Mark

 

________________________________________

From: tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on behalf of Jennings, Guy [jennings@aps.anl.gov]

Sent: Friday, October 24, 2014 11:10 AM

To: tech-talk@aps.anl.gov

Subject: Re: Focus deadlock

 

Doesn’t the common factor seem to be motif?

 

On Oct 24, 2014, at 9:50 AM, Specht, Eliot D. <spechted@ornl.gov> wrote:

 

Pete,

 

Can you help me to make a well-posed question for the Winteracter developer? What kind of events are created by the EPICS system which could be picked up by an application which is not EPICS-aware? That is, how would you describe a CA monitor event to a developer who is unfamiliar with EPICS?

 

Eliot Specht

 

Subject:               Re: Focus deadlock

From:    Pete Jemian <jemian@anl.gov>

To:          <tech-talk@aps.anl.gov>

Date:     Fri, 24 Oct 2014 07:50:49 -0500

Can this be a an issue where the GUI is receiving CA monitor events directly and focusing the associated window with each event? If so, can you throttle widget updates in Winteracter to a fixed interval rather than updating the GUI for each CA monitor event received?

 

On 10/24/2014 7:36 AM, Specht, Eliot D. wrote:

I’m seeing a conflict between:

 

“medm pilatusDetector.adl” and a Winteracter program.  Winteracter

creates GUIs for Fortran programs using Motif. The Winteracter program

is simply waiting for input while the problem occurs. The result is that

input focus shifts rapidly between two Winteracter windows. The medm

windows do not get input focus, so it’s hard to understand how medm

contributes to the problem.

 

Subject:               Re: Focus deadlock

 

From:    Pete Jemian <jemian@anl.gov>

 

To:          <tech-talk@aps.anl.gov>

 

Date:     Thu, 23 Oct 2014 13:26:17 -0500

 

What are the GUI applications involved?

 

On 10/23/2014 1:15 PM, Specht, Eliot D. wrote:

 

I’m running an application on a Linux x86_64 machine which opens several

 

windows for user input and data display. It runs fine unless I have an

 

EPICS areadetector IOC running in the background, in which case I get a

 

“focus deadlock”, where focus shifts rapidly between two application

 

windows and the screen becomes unresponsive to keyboard or mouse input.

 

The problem occurs under Gnome but not KDE. Running KDE is an effective

 

fix, but it would be nice to get to the bottom of the problem. Can

 

anyone suggest what’s going on?

 

Eliot Specht                        Voice: (865)574-7682

 

Oak Ridge National Laboratory       FAX:   (865)574-4913

 

P.O. Box 2008, MS 6064

 

Oak Ridge, TN 37831-6064

 

Eliot Specht                        Voice: (865)574-7682

 

Oak Ridge National Laboratory       FAX:   (865)574-4913

 

P.O. Box 2008, MS 6064

 

Oak Ridge, TN 37831-6064

 

 

--

----------------------------------------------------------

Pete R. Jemian, Ph.D.                <jemian@anl.gov>

Beam line Controls and Data Acquisition, Group Leader

Advanced Photon Source,   Argonne National Laboratory

Argonne, IL  60439                   630 - 252 - 3189

-----------------------------------------------------------

    Education is the one thing for which people

       are willing to pay yet not receive.

-----------------------------------------------------------

 

Eliot Specht                        Voice: (865)574-7682

Oak Ridge National Laboratory       FAX:   (865)574-4913

P.O. Box 2008, MS 6064

Oak Ridge, TN 37831-6064

 

 

 

 

 

 

--

----------------------------------------------------------

Pete R. Jemian, Ph.D.                <jemian@anl.gov>

Beam line Controls and Data Acquisition, Group Leader

Advanced Photon Source,   Argonne National Laboratory

Argonne, IL  60439                   630 - 252 - 3189

-----------------------------------------------------------

   Education is the one thing for which people

      are willing to pay yet not receive.

-----------------------------------------------------------

 

Eliot Specht                        Voice: (865)574-7682

Oak Ridge National Laboratory       FAX:   (865)574-4913

P.O. Box 2008, MS 6064

Oak Ridge, TN 37831-6064