Experimental Physics and
Industrial Control System

"Wang Xiaoqiang (PSI)" <[email protected]> · Tue, 6 Dec 2016 09:38:00 +0000

Hi Bruce,

I replied you here https://github.com/paulscherrerinstitute/pcaspy/issues/29#issuecomment-265103000

I carried out the described test procedure on a SL6 64bit Linux PC. The problem appears definitely in a few seconds.

Best
Xiaoqiang

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Bruce Hill
Sent: Dienstag, 6. Dezember 2016 04:15
To: [email protected]
Subject: Re: deadlock in pcas 3.14.12.6-rc1

Hi Xiaoqiang,
Do you have a pcaspy example that I can run to reproduce this?

I'm running pcaspy 0.6.2 currently, but could also build from a github branch if available.

Thanks,
- Bruce

On 11/10/2016 08:59 AM, Wang Xiaoqiang (PSI) wrote:
> Hi,
>
> I am testing the support of dynamic array in the recent base 3.14.12.6-rc1.
> Using a normal pcaspy application, which updates ~15 Hz. It repeatedly gets into a deadlock state.
>
> The analysis has been put up here
> https://github.com/paulscherrerinstitute/pcaspy/issues/29
>
> The solution could be reversing the lock order during 
> casEventSys::process. But it does not seem to be easy, because the chain of calls involved.
>
> Best
> Xiaoqiang

--
Bruce Hill
Member Technical Staff
SLAC National Accelerator Lab
2575 Sand Hill Road M/S 10
Menlo Park, CA  94025

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System