Using of tasks in openmp for recursive calls
#include "stdio.h"

int com_fib(int n)
{
int f,fn2,fn1;
// f(n) = f(n-1) + f(n-2)
if(n == 0||n == 1) return n;
if ( n < 20 ) return(com_fib(n-1) + com_fib(n-2));

#pragma omp task shared(fn1)
{ fn1 = com_fib(n-1); }

#pragma omp task shared(fn2)
{ fn2 = com_fib(n-2); }

#pragma omp taskwait
f = fn1 + fn1;

return f;
}

void main(int argc, char *argv[])
{
int result;
// printf("arg is %dn", atoi(argv[1]) );
#pragma omp parallel
{
    #pragma omp single nowait
    {
        result = com_fib(atoi(argv[1]));
    } // End of single
} // End of parallel region
printf("Fib is %dn", result);

}