Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  <2017 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
<== Date ==> <== Thread ==>

Subject: Re: memory leak after unloading of ca.lib
From: Ben Franksen <benjamin.franksen@helmholtz-berlin.de>
To: <tech-talk@aps.anl.gov>
Date: Thu, 23 Feb 2017 21:29:18 +0100
Am 23.02.2017 um 18:26 schrieb Michael Davidsaver:
Personally, I'd never consider trying to unload libCom or libca.
Neither was designed with this in mind.

Carsten (and me) wouldn't either, it's just that Labview seems to insist
on it :-(

For example.  With libCom the errlog thread is never stopped.  And libca
registers a function pointer using epicsAtExit().  So if libca is
unloaded, then running epicsExit() will fail.

Perhaps there should be a way to unregister the epicsAtExit callback.

There are also a number of one-time allocations which aren't cleaned up.

More CA fixes needed?

Cheers
Ben

On 02/23/2017 03:50 AM, Carsten Winkler wrote:
Hi there,

when your project (e.g. LabVIEW) uses dynamic loading and unloading of
channel access classes your main class will sometimes (at 64 bit nearly
always) crush with a segmentation fault. The reason seems to be missing
free() and delete functions in EPICS Base 3.14.12.6 (I'm sure this
applies also to other EPICS Base versions).

I wrote a tiny test case to check it and it would be great to get any
advise to solve the issue.

Best regards
Carsten


________________________________

Helmholtz-Zentrum Berlin für Materialien und Energie GmbH

Mitglied der Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren e.V.

Aufsichtsrat: Vorsitzender Dr. Karl Eugen Huthmacher, stv. Vorsitzende Dr. Jutta Koch-Unterseher
Geschäftsführung: Prof. Dr. Anke Rita Kaysser-Pyzalla, Thomas Frederking

Sitz Berlin, AG Charlottenburg, 89 HRB 5583

Postadresse:
Hahn-Meitner-Platz 1
D-14109 Berlin

http://www.helmholtz-berlin.de



________________________________

Helmholtz-Zentrum Berlin für Materialien und Energie GmbH

Mitglied der Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren e.V.

Aufsichtsrat: Vorsitzender Dr. Karl Eugen Huthmacher, stv. Vorsitzende Dr. Jutta Koch-Unterseher
Geschäftsführung: Prof. Dr. Anke Rita Kaysser-Pyzalla, Thomas Frederking

Sitz Berlin, AG Charlottenburg, 89 HRB 5583

Postadresse:
Hahn-Meitner-Platz 1
D-14109 Berlin

http://www.helmholtz-berlin.de


Replies:
RE: memory leak after unloading of ca.lib Hill, Jeff
Re: memory leak after unloading of ca.lib Michael Davidsaver
References:
memory leak after unloading of ca.lib Carsten Winkler
Re: memory leak after unloading of ca.lib Michael Davidsaver

Navigate by Date:
Prev: RE: memory leak after unloading of ca.lib Hill, Jeff
Next: RE: memory leak after unloading of ca.lib Hill, Jeff
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
Navigate by Thread:
Prev: Re: memory leak after unloading of ca.lib Michael Davidsaver
Next: RE: memory leak after unloading of ca.lib Hill, Jeff
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
ANJ, 23 Feb 2017 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·