Function mpi_sys::MPIX_Grequest_class_create

pub unsafe extern "C" fn MPIX_Grequest_class_create(
    query_fn: MPI_Grequest_query_function, 
    free_fn: MPI_Grequest_free_function, 
    cancel_fn: MPI_Grequest_cancel_function, 
    poll_fn: MPIX_Grequest_poll_function, 
    wait_fn: MPIX_Grequest_wait_function, 
    greq_class: *mut MPIX_Grequest_class
) -> c_int