[Paraview] Multi-Threading issues

[Utkarsh Ayachit]

It is possible that the timer times out in middle of a progress event
which happens while filters are executing.

Utkarsh

On Mon, May 31, 2010 at 7:32 AM, Biddiscombe, John A. <biddisco at cscs.ch> wrote:
> We have been developing an interface which allows us to control our
> simulations on the fly and have used a Qtimer in a custom panel, to query
> when new data is available from the server. When data is ready we
>
>
>
> when the timer is triggered and the server reports that data is ready, we do
> a number of bookkepping taks, and then update the pipeline/representation
> and other stuff using server manager objects like so...
>
>
>
>     this->Reader->InvokeCommand("Modified");
>
>     this->Reader->UpdatePropertyInformation();
>
>     this->Reader->UpdateVTKObjects();
>
>     this->Reader->UpdatePipeline();
>
>
>
> and finally after more stuff ... trigger a render ...
>
>
>
>
>
>     if (pqActiveObjects::instance().activeView())
>
>     {
>
>       pqActiveObjects::instance().activeView()->render();
>
>     }
>
>
>
> This has been working fine for some months, but recently, we’ve been getting
> strange errors which look like the paraview client is interacting with the
> server manager, at the same time as we are triggering updates. A classic
> threading type problem. [We have added another thread to pvserver which
> accepts data from the simulation via its own socket communicator, this
> appears stable as we can do much stuff without forcing updates in the
> pvclient gui and we get no errors, these threads reside only inside pvserver
> ]
>
>
>
> Within a Qt+ParaView framework, can anyone tell me if it is “safe” to Update
> pipelines from the server manager within a timer triggered slot. Is there an
> existing example of anything similar which updates server manager objects
> from a timer – also forcing renders. I know that rendering should be
> triggered from the gui thread only – should this be removed from the Qtimer
> slot.
>
>
>
> Any feedback welcome.
>
>
>
> Thanks
>
>
>
> JB
>
>
>
> --
>
> John Biddiscombe,                            email:biddisco @ cscs.ch
>
> http://www.cscs.ch/
>
> CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
>
> Via Cantonale, 6928 Manno, Switzerland      | Fax:  +41 (91) 610.82.82
>
>
>
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