Second sum_vector

gistfile1.c

void sum_vector (int *X, int n)
{
   int sum = 0;
   int i;
   int slice = n/OMP_get_num_threads();
   vector<int> threads(n);
   for (int i = 0; i < OMP_get_num_threads(); ++i)
   {
      #pragma omp task
      threads[i] = sum_slice(X, i*slice, (i+1)*slice);
   }
   #pragma omp taskwait
   for(int i = 0; i < threads.size(); ++i)
      sum += threads[i];
   
   return sum;
}

int sum_slice(int *X, int start, int end) {

   int sum = 0;

   for(int i = start; i < end; ++i)
      sum += X[i];

   return sum;
}

void main()
{
   ...
   #pragma omp parallel
   {
       #pragma omp single
       sum_vector(v,N);
   }
   ...
}