Experimental Physics and
Industrial Control System

On Thu, Jul 17 2014, Chen Xue <[email protected]> wrote:
> We have an external program needs to be run in CSS GUI. I created a 
> button to trigger this event, but I found it freezes CSS GUI after it 
> runs. I have to use Ctrl-Z to stop this external program in terminal 
> window, but it can't bring CSS alive.

Try backgrounding the process when you launch it by adding a '&' to the
end of the invocation line.  This is necessary if the program being
launched is long running.  CSS is probably hung waiting for the program
to return, which it's not.

Ctrl-Z also won't help, since that tells the program to suspend, which
keeps it alive, and therefore continuing to block the caller.  I bet CSS
control will return once the child process is killed (Ctrl-C or the
like).

jamie.

Attachment: pgpHGNuLRJZJl.pgp
Description: PGP signature

References:

CSS is frozen after starts an external program Chen Xue

Navigate by Date:

Prev: EPICS Collaboration Meeting October 2014 mattei

Next: Driver for Linkam T95 System Controller? Lewis, Wayne

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  2018  2019  2020  2021  2022  2023  2024 

Navigate by Thread:

Prev: CSS is frozen after starts an external program Chen Xue

Next: EPICS Collaboration Meeting October 2014 mattei

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  2018  2019  2020  2021  2022  2023  2024