Hi Anthony, I don't have any answers from a first read through, and it's not a problem that's been reported as far as I can recall off the top of my head, so it'll probably require a code review of the relevant code and discussion to spot what might be amiss. Which version of the OSG are you using? Has the bug appeared when moving between OSG versions or changing your usage model of the OSG?
Robert. On 20 June 2012 06:28, I-Nixon, Anthony D <[email protected]> wrote: > Hi Everyone: > > > > I’m seeing behavior in my application whereby an osg Window will come up, > but won’t respond to any events for a few (sometimes 10 or more seconds). > Rendering is happening during this time, but no event processing. > > > > I tracked it down to the following: > > > > 1. The event queue is constructed and initializes _startTick > > 2. Some events are pushed onto the queue (not explicitly, could be > mouse move, etc) > > 3. Some time passes (generally related to model loading – we are using > osgEarth) > > 4. Rendering starts and calls setStartTick() on the event queue with a > new time. > > 5. takeEvents() is called during event traversal, but because the > startTick has been reset, the top event is in the “future” and takeEvents() > returns nothing. > > 6. Eventually enough time passes so that the event is no longer in the > “future” and event processing starts happening. > > > > The time that the stall lasts for is clearly related to how long step 3 > takes – which can be lengthy when osgEarth is fetching stuff off the > network. > > > > I fixed it by clearing out the events when setStartTick is called, viz: > > > > > > void EventQueue::setStartTick(osg::Timer_t tick) > > { > > OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_eventQueueMutex); > > // Since setting the start tick effectively invalidates the time > > // of any events already in the queue, clear it out > > _eventQueue.clear(); > > _startTick = tick; > > } > > > > I haven’t got a sample that reproduces the behavior, but it seems to make > sense that if the startTick is reset, all the existing events are toast? > I’m not sure why no one else has seen this – maybe our usage pattern is > different from the norm? > > > > Cheers > > > > Anthony > > > > Anthony Nixon > > Modelling & Simulation Architect > > Systems Analysis Laboratory (SAL) > > Strategic Development & Experimentation - International > > Boeing Defence Australia Ltd > > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
