Re: CSS is frozen after starts an external program

[Jameson Graef Rollins <jrollins@ligo.caltech.edu>]

On Thu, Jul 17 2014, Chen Xue <xue@bio.aps.anl.gov> 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.

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