[visit-developers] VisIt and Qt signals

Sveta sveta at txcorp.com
Mon Jun 15 16:53:29 EDT 2015

Hi Brad,
I investigated and the problem occurs when we call VisItViewer::DelayedMethods::OpenDatabase...   What is the main difference between DelayedMethods and Methods?
Thank you,


> On Jun 12, 2015, at 4:52 PM, Brad Whitlock <bjw at ilight.com> wrote:
> Hi Sveta,
>    VisIt's src/common/comm/RemoteProcess class installs a signal handler for SIGCHLD that lets it detect when child processes die. This is so it can detect when VisIt programs die on startup. It looks like it does not restore any previously existing signal handler. Maybe this is interfering with Qt's "finished" mechanism.
> HTH,
> Brad
>> On Fri, Jun 12, 2015 at 3:30 PM, Sveta <sveta at txcorp.com> wrote:
>> Hi everybody,
>> We have been having a strange problem.  We have Qt process(es) started by our application and we connect to it signal "finished."  All signals emit and all works before we load files into VisIt.  Once we do this, the processes do not emit "finished" (looks like).  Any ideas, suggestions and opinions are appreciated.
>> Best,
>> Sveta
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