Experimental Physics and
Industrial Control System

Tong Zhang via Tech-talk <[email protected]> · Fri, 12 Apr 2019 13:23:19 -0400

Hi Matt,

Just tried this PR (https://github.com/pyepics/pyepics/pull/150), it

solved my issue (probably threading race condition), thank Daron for the

help!

Hope you'll merge this PR soon.

Tong

On 4/11/19 6:52 PM, Tong Zhang via Tech-talk wrote:

Hi Matt,

I think the following issue I encountered may have something to do with

pyepics, which after discussing with Daron, still cannot be resolved yet.

I'm trying to create pv callbacks onto my high-level GUI application

with pyepics, but the app crashed because of the error regarding the CA

context, please see the attached screenshot. And the strange thing is

this only happened to Python 3.5, not Python 3.6 and Python 3.7.

To my understanding, the GUI case is slightly different than python

thread, the main thread is for UI rendering, all my created callback are

spawned from this main thread, I can do other CA action (put/get)

without any problem, so where is the default CA context in the GUI case?

I've checked this link

https://github.com/pyepics/pyepics/issues/68#issuecomment-290892241 and

the guideline for python thread with pyepics, but still not sure how can

I make use of the context.

Appreciate for any reply,
Tong

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System