Hi Cory,
Could you modify one of the OSG examples to reproduce the problem you
are seeing so that others can have a bash at reproducing the problem
as trying to debug this type of stuff remotely is next to impossible.
Robert.
On Tue, Jun 23, 2009 at 10:45 PM, Cory Riddell<c...@codeware.com> wrote:
> Robert et al,
>
> So, the 2.9.5 build doesn't fix my problem.
>
> My app has two threads. The second one is my viewer thread. To shutdown, my
> main threads calls viewer->setDone(true) then waits on a shared lock. The
> viewer thread stops running (I start the viewer with viewer->run()) and then
> calls viewer->stopThreading() and verifies that getAllThreads(threads,true)
> returns 0. It then notifies the main thread and exits.
>
> I really don't understand why getAllThreads() would return 0 when
> GraphicsContext::runOperations() still seems to be running. This is why I
> was asking about the done flag being reset to true (you told me it was
> reinitializing) and about the non-volatile-ness of the done flags.
>
> I'm no multithreading guru, but this isn't my first multithreaded app
> either. I'm confused.
>
> Cory
>
> Cory Riddell wrote:
>
> Hi Robert,
>
> I just saw your post about the release of 2.9.5 and it includes threading
> fixes. I think I'll grab that and give it a go before I bother the list
> about this any more.
>
> Thanks,
> Cory
>
> Robert Osfield wrote:
>
> Hi Cory,
>
> Do you find that normal OSG apps have problems when shutting down?
>
> Which version of the OSG are you using?
>
> When you say delete, exactly how are you going about delete? Could
> you supply an example of the clean up code you are using, it does
> sound like there is something amiss.
>
> Robert.
>
> On Mon, Jun 22, 2009 at 4:19 PM, Cory Riddell<c...@codeware.com> wrote:
>
>
> Hi Robert,
>
> The reason I started to look at this flag is because I'm getting frequent
> access violations when shutting down my app.
>
> Usually, the problem is in GraphicsContext::runOperations().
>
> When I shut down, I call setDone(true) on my viewer instance. I also call
> stopThreading() and make sure that getAllThreads(threads, true) returns 0,
> then I delete everything. I thought this would be sufficient, but I'm still
> getting an access violation in GraphicsContext::runOperations() when it
> tries to dereference a camera pointer and the camera has been deleted. My
> scene includes two cameras, the primary one and a second one to render the
> background.
>
> Is there some other indicator that OSG threads are still running that I
> should be waiting on?
>
> Cory
>
> Robert Osfield wrote:
>
> HI Cory,
>
> The Done flag is a hint to say tell threads that work should stop, so
> once it's stopped you want to reset things so that we you start the
> threads again it doesn't think that it's done again.
>
> Robert.
>
> On Mon, Jun 15, 2009 at 9:37 PM, Cory Riddell<c...@codeware.com> wrote:
>
>
> ViewerBase::stopThreading() includes this block of code:
>
> for(Cameras::iterator camItr = cameras.begin();
> camItr != cameras.end();
> ++camItr)
> {
> osg::Camera* camera = *camItr;
> Renderer* renderer = dynamic_cast<Renderer*>(camera->getRenderer());
> if (renderer)
> {
> renderer->setGraphicsThreadDoesCull( true );
> renderer->setDone(false);
> }
> }
>
> Since threading is being stopped, shouldn't the line in red be setting done
> to true?
>
> Cory
>
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