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/*=========================================================================
Program: Visualization Toolkit
Module: TaskParallelismWithPorts.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 task parallel application
// with VTK. It creates two different pipelines and assigns each to
// one processor. These pipelines are:
// 1. rtSource -> contour -> probe .-> append
// \ / port
// -> gradient magnitude /
// 2. rtSource -> gradient -> shrink -> glyph3D -> port
// See task3.cxx and task4.cxx for the pipelines.
#include "TaskParallelismWithPorts.h"
// This function sets up properties common to both processes
// and executes the task corresponding to the current process
void process(vtkMultiProcessController* controller, void* vtkNotUsed(arg))
{
taskFunction task;
int myId = controller->GetLocalProcessId();
// Chose the appropriate task (see task3.cxx and task4.cxx)
if ( myId == 0 )
{
task = task3;
}
else
{
task = task4;
}
// Run the tasks (see task3.cxx and task4.cxx)
(*task)(EXTENT);
}
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;
}
// Execute the function named "process" on both processes
controller->SetSingleMethod(process, 0);
controller->SingleMethodExecute();
// Clean-up and exit
controller->Finalize();
controller->Delete();
return 0;
}
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