Thread: Unable to explain these errors.

Here is a part of the code that is creating some problems.

Code:

 
 1 typedef int (mpich_peruse_callback_f)(peruse_event_h event_h,
  2               MPI_Aint unique_id, void * spec, void * param);
  3
  4
  5 struct mpich_peruse_handle_t
  6 {
  7     int handle;
  8     int ref_count;
  9     int active;                     /**< Whether this handle has been activated */
 10     int event;                      /**< Event being watched */
 11     int type;                       /**< Object-type this event is registered on */
 12     MPID_Comm *comm;                 /**< Corresponding communicicator */
 13     mpich_peruse_callback_f *fn;     /**< Callback function specified by user */
 14     void *param;                     /**< Parameters being passed to callback */
 15 };
 16
 17 typedef struct mpich_peruse_handle_t  mpich_peruse_handle_t;
 18
 19
 20 void PERUSE_TRACE_COMM_EVENT(int event, MPID_Request *req, int op)
 21 {
 22     if( NULL != req->comm->c_peruse_handles )
 23     {
 24         mpich_peruse_handle_t * _ptr = req->comm->c_peruse_handles[(event)];
 25         printf(" ref_count = %d\n", _ptr->ref_count);
 26         if (NULL != _ptr && _ptr->active) {
 27             peruse_comm_spec_t _comm_spec;
 28             _comm_spec.comm      = req->comm;
 29             _comm_spec.operation = (op);
 30             _ptr->fn(_ptr, (MPI_Aint)(req), &_comm_spec, _ptr->param);
 31         }
 32     }
 33 return;
 34 }

And these are the error messages being displayed :

Code:

Line no 13 : error: expected specifier-qualifier-list before ‘mpich_peruse_callback_f’
 In function ‘PERUSE_TRACE_COMM_EVENT’:
Line no 30 : error: ‘mpich_peruse_handle_t’ has no member named ‘fn’
Line no 30 :  error: ‘mpich_peruse_handle_t’ has no member named ‘param’

I am totally vexed by these errors as they seem to be pretty much correct. 'mpich_peruse_callback_f' has been defined before the structure 'struct mpich_peruse_handle_t' is defined. And the structure clearly contain the members 'fn' and 'param'.

I tried compiling using the -E option, I did see anything suspicious in these lines. Am I missing something that is obvious here?

Thanks.

don't you miss * in your function pointer declaration?

I'm not entirely sure, but I believe you want the * for the function pointer in the typedef, and not in the struct.

Code:

typedef int (mpich_peruse_callback_f *)(peruse_event_h event_h,
               MPI_Aint unique_id, void * spec, void * param);
...
    mpich_peruse_callback_f fn;     /**< Callback function specified by user */

This may not help at all, but it is what looks unusual to me in the code.

--
Mats