[vtkusers] a question about cross-reference in vtk

[wwyang]

There are two classes which are refered by each other:

class CVTKHost : public vtkObject{
       ...
    vtkSetObjectMacro(Client, CVTKClient);
       ...

    CVTKClient *Client;
} 

class CVTKClient : public vtkObject{
       ...
    vtkSetObjectMacro(Host, CVTKHost);
       ...

    CVTKHost *Host;
} 

I use them as follows:

CVTKHost *pHost = CVTKHost::New();
CVTKClient *pClient = CVTKClient::New();

pHost->SetClient(pClient);
pClient->SetHost(pHost);

pHost->Delete();
pClient->Delete();

Because they are referred by each other, a dead lock occurs in the above code, which causes
objects pointered by pHost&pClient will not be released.  

One way to resolve it is to re-arrange above codes as:
...

pHost->SetClient(pClient);
pClient->SetHost(pHost);

pHost->SetClient(NULL);
pClient->SetHost(NULL);
pHost->Delete();
pClient->Delete();  

but it's tedious.

Anybody knows more better way to resolve this condition in vtk?  I know the classes of vtkAlgorithm
and vtkExecutive are also cross-referred, and Register(), UnRegister() methods in them are overridden with 
garbage collection mechanism in vtk. But i donna understand this mechanism so clearly that i donna know 
whether it's the way to resolve this problem in vtk. 

Appreciate any advice.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20060829/0806d7e8/attachment.htm>