Debugging Parallel Program In C -

i have following program in open mp (c).

it gives 0 or 3 fibonnaci number or crashes giving segmentation fault.

#include <stdlib.h> #include <stdio.h> #include <omp.h>  static int fib(int);  int main(){  int nthreads, tid;  int n =8;  #pragma omp parallel num_threads(4) private(tid)  {  #pragma omp single  {  tid = omp_get_thread_num();  printf("hello world (%d)\n", tid);  printf("fib(%d) = %d %d\n", n, fib(n), tid);  }  } // threads join master thread , terminates  } static int fib(int n){  int i, j, id;  if(n < 2)  return n;  #pragma omp task shared (i) private (id)  {  = fib(n-1);  }  #pragma omp task shared (j) private (id) {  j = fib(n-2);  }   return (i+j);  } 

what wrong program ?

the output like:

hello world (3)

fib(8) = 3 3

you need have taskwait in #pragma omp taskwait right before returning (i+j). otherwise return before numbers computed, without waiting other tasks.