PPM_DSO_INTERNAL Xt_request xt_request_msgs_ddt_packed_new(int n_requests, const MPI_Request requests[n_requests], MPI_Comm comm, int n_packed, int n_tmp_buffers, Xt_ddt pack_ddts[n_packed], void *packed_data[n_packed], void *tmp_buffers[n_tmp_buffers], void *unpacked_data, enum xt_memtype pack_memtype, enum xt_memtype tmp_memtype)