void* attribute_val_out, int* flag);
typedef int MPI_Delete_function(MPI_Comm comm, int keyval, void* attribute_val, void* extra_state);
+XBT_PUBLIC(MPI_Datatype) MPI_PACKED;
MPI_CALL(XBT_PUBLIC(int), MPI_Pack_size, (int incount, MPI_Datatype datatype, MPI_Comm comm, int* size));
MPI_CALL(XBT_PUBLIC(int), MPI_Cart_coords, (MPI_Comm comm, int rank, int maxdims, int* coords));
MPI_CALL(XBT_PUBLIC(int), MPI_Cart_create, (MPI_Comm comm_old, int ndims, int* dims, int* periods, int reorder, MPI_Comm* comm_cart));
CREATE_MPI_DATATYPE_NULL(MPI_UB);
CREATE_MPI_DATATYPE_NULL(MPI_LB);
+CREATE_MPI_DATATYPE_NULL(MPI_PACKED);
// Internal use only
CREATE_MPI_DATATYPE(MPI_PTR, void*);