static int cancelled (const MPI_Status * status);
static void set_cancelled (MPI_Status * status, int flag);
static void set_elements(MPI_Status* status, const Datatype*, int count);
static int cancelled (const MPI_Status * status);
static void set_cancelled (MPI_Status * status, int flag);
static void set_elements(MPI_Status* status, const Datatype*, int count);