===== SKEPU code in FastFlow =====

The code should be compiled with CUDA, using **nvcc** compiler:
<code>
nvcc -I fastflowFfDirPath -I skepuIncludeDirPath -o pipemap pipemap.cu -lpthread
</code>

<code g++ "pipemap.cu">
#include <iostream>
#include <ff/pipeline.hpp>
#include <math.h>

#define SKEPU_CUDA
// #define SKEPU_OPENMP

#include <skepu/vector.h>
#include <skepu/map.h>

using namespace ff;

int N = 10; 

class Source: public ff_node {
public:
  Source(unsigned int streamlen):streamlen(streamlen)  {}

  void * svc(void * task) {
    if(streamlen != 0) {
      skepu::Vector<float> * v = new skepu::Vector<float>(N,(float)streamlen);
      streamlen--;
      task = (void *) v;
#ifdef DEBUG
      std::cout << "Source delivering:" << *v << std::endl;
#endif
    } else {
      task = NULL; 
    }
    return task;
  }
private:
  unsigned int streamlen;
};

class Drain: public ff_node {
  void * svc(void * task) {
    skepu::Vector<float> * v = (skepu::Vector<float> *) task;
#ifdef DEBUG
    std::cout << "Drain got " << *v << std::endl;
#endif
    return(GO_ON);
  }
}; 

#define ITERNO 800000

UNARY_FUNC(iters, float, a,
           for(int _i=0; _i<ITERNO; _i++) a = sin(a); return(a);
           )

int NN = 10; 

UNARY_FUNC(f, float, a, return(a+1); )

class MapStage:public ff_node {
  void *svc(void * task) {
    skepu::Vector<float> * v = (skepu::Vector<float> *) task;
#ifdef DEBUG
    std::cout << "MapStage got: " << *v << std::endl; 
#endif
    skepu::Vector<float> * r = new skepu::Vector<float>(NN);
    skepu::Map<iters> skepumap(new iters);
    skepumap(*v, *r);
#ifdef DEBUG
    std::cout << "MapStage delivering: " << *r << std::endl; 
#endif
    return((void *) r);
  }
};


int main(int argc, char * argv[]) {
  if (argc!=3) {
    std::cerr << "use: "  << argv[0] << " streamlen veclen\n";
    return -1;
  }
  N = atoi(argv[2]);
 
  // bild a 3-stage pipeline
  ff_pipeline pipe;
  pipe.add_stage(new Source(atoi(argv[1])));
  pipe.add_stage(new MapStage());
  pipe.add_stage(new Drain());


  ffTime(START_TIME);
  if (pipe.run_and_wait_end()<0) {
    error("running pipeline\n");
    return -1;
  }
  ffTime(STOP_TIME);

  std::cerr << "DONE, pipe  time= " << pipe.ffTime() << " (ms)\n";
  std::cerr << "DONE, total time= " << ffTime(GET_TIME) << " (ms)\n";
  pipe.ffStats(std::cerr);
  return 0;
}
</code>