/*D
   MPIX_Grequest_class_create -

Synopsis:
.vb
int MPIX_Grequest_class_create(MPI_Grequest_query_function *query_fn,
                               MPI_Grequest_free_function *free_fn,
                               MPI_Grequest_cancel_function *cancel_fn,
                               MPIX_Grequest_poll_function *poll_fn,
                               MPIX_Grequest_wait_function *wait_fn,
                               MPIX_Grequest_class *greq_class)
.ve

Input Parameters:
+ query_fn - callback function invoked when request status is queried (function)
. free_fn - callback function invoked when request is freed (function)
. cancel_fn - callback function invoked when request is cancelled (function)
. poll_fn - callback function invoked when request completion is tested (function)
- wait_fn - callback function invoked when request is waited on (function)

Output Parameters:
. greq_class - generalized request class (None)

.N ThreadSafe

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_ARG
.N MPI_ERR_OTHER

D*/

