Segmentation fault with parallel for

[adrael]

Hi,

I am using template parallel_for and I have a seg fault at execution. (It's not the first time that I try using parallel_for). here is my serial code :

template

void MyNode
::get_obj( std::vector
 &objects, 

 const Q in_rect ) const 

{

 for( unsigned int i = 0; i < this->elem_list.size( ); i++ )

 {

 Node
 *sample = this->elem_list.at( i );

 if( sample->get_foo().bar( in_rect ) == true )

 {

 sample_fcnB( objects, in_rect );

 }

 }

}

And here is my code :

template 

  class get_obj_for {

   const vect< Node
* > &my_elem_list;

   const B &my_in_rect ; 

   vector
 &my_objects ;   

   public:

    void operator()( const blocked_range& r ) const {

     for( unsigned int i = r.begin(); i < r.end(); i++ )

     {

      Node
 *sample = my_elem_list.at( i );

       if( sample->get_foo().bar( my_in_rect ) == true )

      {

      sample_fcnB( my_objects, my_in_rect );

      }

      }

    }

  // Constructor

    get_obj_for(

 &
nbsp;     const vect< Node
* > &liste_elem, 

      const B &rect,

      vector
 &objects) : 

      my_m_elel_list(liste_elem), 

      my_in_rect(rect),

      my_objects(objects) 

    {}

  };

It compiles. But It crashes at runtime with segmentation fault. It does not enter the operator() method ( a printf just before the loop doesn't appear).
And gdb show that segfault occurs in tbb::parallel_for....get_obj_for()

I don't know what to do now.

[ARCH_R_Intel]

Does your code crash even with a single thread?

What I usually do is run with a single thread (e.g. "tbb::use task_scheduler_init init(1);" and see if the code crashses. If so, then I debug the code like I would debug serial. code (e.g. single step it, or look at the traceback).

[adrael]

Problem solved. I had forgotten to initialize tbb...