> On 4 March 2014 12:17, ttaw <[email protected]> wrote:
>
>> hello, everyone.
>> I am an osg learner in China.Recently, when I read the source code of
>> osg::Impostor class, something about multi-threading confused me a lot.That
>> is, in the case of CULL_VISITOR of osg::Impostor::traverse, no mutex is
>> used to protect the function createImpostorSprite which changes the sprite
>> list. Doesn't it result in a potential crash when multi-cameras are active
>> and CullThreadPerCameraDrawThreadPerContext model is used?
>> Any discussion is welcome.Thanks.
>>
>
>Internally osgSim::Impostor uses a buffer with one entry per cull visitor
>so that each cull thread doesn't overlap and contend on the same data.
Do you mean _impostorSpriteListBuffer? As I know, it's a buffer per GC rather
than one per cull visitor. As there may be multi-cameras linked to a single GC,
contention may happen. I found no buffer with one entry per cull visitor in
Impostor except for that. Could you show me the variable you mentioned like
this: Class::variablename?Thanks a lot.
----------------------
Wu Zhicheng
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