Gregory Schultz (gschultz++at++mitre.org)
Tue, 02 Nov 1999 16:05:47 -0500
Hope this helps!
Greg Schultz
Anthony Bavuso wrote:
>
> I have a questions regarding multithreading, mutual exclusion, and the scene
> graph.
>
> I am designing a prototype flight simulator. I have created a class to
> represent visible dynamic models (models that move) in the simulation that
> run in their own thread of execution (using pthreads). This class called
> DynamicModel has a pointer to a pfDCS and a child pfNode for the geometry
> which are both children of the root scene graph node.
>
> The DynamicModel model objects updates the pfDCS node to alter model
> position in its own thread and hence asynchronously to performer traversing
> the scene graph.
>
> There are obvious problems that this could cause. For example the
> DynamicModel may be writing to the pfDCS node while performer is trying to
> read it. Problems solved by using some kind of semaphore, mutex, lock, etc.
>
> My question is, Does performer have built-in to the pfDCS class and-or its
> parent class, come kind of locking mechanism to prevent these problems? Can
> you point me to where I could find documentation on this issue?
>
> Also if the locking capability is not built in, would it be a good idea to
> derive a new class from pfDCS that incorporates this functionality? Has
> anyone done this successfully?
>
> Thanks.
>
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