Experimental Physics and
Industrial Control System

Peter Heesterman via Core-talk <core-talk at aps.anl.gov> · Wed, 20 May 2020 17:38:38 -0000

See https://stackoverflow.com/questions/35828004/waitforsingleobject-
for-thread-object-does-not-work-in-dll-unload

I have implemented a solution by creating a function within the myCaLab DLL which in turn ca_task_exit (or ca_context_destroy), and which called from the main application.
This causes it to exit normally.

Is this a solution that meets your needs?

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https://bugs.launchpad.net/bugs/1879532

Title:
  Can't completely shutdown libCa and libCom

Status in EPICS Base:
  Confirmed

Bug description:
  Most recently, Carsten Winkler reported in https://epics.anl.gov/tech-
  talk/2020/msg00946.php

      For a project I need to load and unload the Channel Access context in a
      shared library. Loading is no problem but unloading. It always fails
      during ca_context_destroy() function.

  This problem has been reported and discussed previously, see
  https://epics.anl.gov/tech-talk/2017/msg00371.php and
  https://epics.anl.gov/tech-talk/2004/msg00743.php thus it is a known
  issue which would probably require significant work to fix.

  This bug report is a place-holder for any work towards making it
  possible to completely shut down all libCom background threads and
  releasing the resources allocated by those subsystems.

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System