code example
TBB boost threads
part of the C++ boost library

#include <boost/thread/thread.hpp>
using namespace boost;

#define PROC (8)

struct thread1 {
 float *x, *y, *ep;
 int i0, i1, p;
 thread1(float *xx, float *yy, float *ee, int pp, int ii0, int ii1) :
  x(xx), y(yy), ep(ee), p(pp), i0(ii0), i1(ii1) {}
 void operator()() {
  // do computation
  float e = 0;
  for (int i=i0; i<i1; ++i) {
   x[i] += ( y[i+1] + y[i-1] )*.5;
   e += y[i] * y[i];
  }
  *ep = e;
 }
};

int main(int argc, char *argv[]) {
  int n = ...;
  float *x, *y;
  x = new float[n+1];
  y = new float[n+1];

  ... // fill x, y

  float e = 0;
  float e_vec[PROC];
  thread_group grp;
  // start threads and wait for termination
  for (int i=0; i<PROC; ++i) {
   thread1 t(x, y, &e_vec[i], i,
     1+((n-1)*i)/PROC, 1+((n-1)*(i+1))/PROC);
   grp.create_thread(t);
  }
  grp.join_all();
  for (int i=0; i<PROC; ++i)
   e += e_vec[i];

  ... // output x, e

  delete[] x, y;
  return 0;
}

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