Experimental Physics and
Industrial Control System

Michael Davidsaver <[email protected]> · Fri, 15 May 2015 15:50:29 -0400

On 05/15/2015 03:27 PM, Jameson Graef Rollins wrote:
> On Fri, May 15 2015, "Wang Xiaoqiang (PSI)" <[email protected]> wrote:
>> Thanks for the hints. In pcaspy library, the PV instances are created on startup and live until application quits.
>> The casPV::destroy method is not implemented.
>> https://github.com/paulscherrerinstitute/pcaspy/blob/master/pcaspy/pv.cpp#L112
> 
> How is the garbage collection handled?  Since the problem does seem to
> occur when subscriptions are disconnected, presumably something is
> destroyed at that point.

Destruction is just a guess on my part.  I could also be memory corruption.

@Jamie, it would be interesting to re-build with debug symbols for the
C++ code (linux-x86_64-debug).  Then you can inspect the stack frames of
the thread which is having problems.  This might help to answer the
question of which operation caused the problem.

You can also get debug symbols for the python interpreter (python-dbg or
python-debuginfo).  This might give some hints to help with reproducing
the problem.  Also, recent versions of GDB understand python C API calls.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System