One of my imagining about the reason of the first problem is that:
The redraw() takes more time than normal when the data to render is changing
by another thread and redraw() is doing something to make the data
consistent
Is that correct?
2009/11/14 Weiyu Yi <[email protected]>
> Hi,
>
> In my programm, one thread is used to detect the collisions and call the
> callbacks if collisions happen, and the main thread is used to controll the
> scene and render it with OpenSG. I exploit boost::thread for the
> multirheading mechanism
>
> but now I have some problems:
>
>
> 1) When I use the multithreading mechanism by mutex, which is provided by
> boost. Callback for collision detection thread and main thread may change
> the scene at the same time, so I have the mutex them. but while renderring
> the scene, it runs sometimes very slowly, the redraw() function sometimes
> takes the 10x more time
> than normal, Why should it happen? Principle it has only read access to
> the scene daten and in my code mutex has no affect to it:
> ******************************
> Func Time(microsec)
> main::redraw(): 3663
> main::redraw(): 10232
> main::redraw(): 1572
> main::redraw(): 1497
> main::redraw(): 1511
> main::redraw(): 1408
> main::redraw(): 45564
> main::redraw(): 1622
> main::redraw(): 1509
> main::redraw(): 1439
> main::redraw(): 1508
> main::redraw(): 43036
> main::redraw(): 1769
> main::redraw(): 7248
> main::redraw(): 1757
> main::redraw(): 1492
> main::redraw(): 1574
> main::redraw(): 2367
> main::redraw(): 1629
> main::redraw(): 13290
> ******************************
>
> 2) I add the code like:
>
> OSG::UInt32 aspectId = 0;
> OSG::ExternalThread::get(0)->initialize(aspectId);
>
> with a callback in the collision detection thread
>
> Could I use the multithreading mechanism of OpenSG when I have declared the
> external thread to OpenSG? e.g like: aspectID=1. and some necessary
> function like getChangeList()->applyAndClear() ?
>
>
> With best regards
> Weiyu
>
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