text: /*=========================================================================
  
    Program:   Visualization Toolkit
    Module:    PipelineParallelism.cxx
  
    Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
    All rights reserved.
    See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
  
       This software is distributed WITHOUT ANY WARRANTY; without even
       the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE.  See the above copyright notice for more information.
  
  =========================================================================*/
  // This example demonstrates how to write a pipeline parallel application
  // with VTK. It creates two parts of a pipeline on a two different
  // processors and connects them with ports. The two processes can then
  // process the data in a pipeline mode, i.e:
  // 1. Consumer asks the producer to start producing data,
  // 2. Consumer receives data and starts processing it,
  // 3. Producer starts producing new data,
  // 4. Goto 2 unless done.
  // The pipeline used in this example is as follows:
  // rtSource -> OutputPort --- InputPort -> contour -> Render
  //        process 0                 process 1
  // See pipe1.cxx and pipe2.cxx for the pipelines.
  
  #include "PipelineParallelism.h"
  
  int main( int argc, char* argv[] )
  {
  
    // Note that this will create a vtkMPIController if MPI
    // is configured, vtkThreadedController otherwise.
    vtkMultiProcessController* controller = vtkMultiProcessController::New();
    controller->Initialize(&argc, &argv);
  
    // When using MPI, the number of processes is determined
    // by the external program which launches this application.
    // However, when using threads, we need to set it ourselves.
    if (controller->IsA("vtkThreadedController"))
    {
      // Set the number of processes to 2 for this example.
      controller->SetNumberOfProcesses(2);
    }
    int numProcs = controller->GetNumberOfProcesses();
  
    if (numProcs != 2)
    {
      cerr << "This example requires two processes." << endl;
      controller->Finalize();
      controller->Delete();
      return 1;
    }
  
    // Assign the functions and execute them
    controller->SetMultipleMethod(0, pipe1, 0);
    controller->SetMultipleMethod(1, pipe2, 0);
    controller->MultipleMethodExecute();
  
    // Clean-up and exit
    controller->Finalize();
    controller->Delete();
  
    return 0;
  }
  
  
  
  
  
  
  
  
  
  