int MPI_Send (
const void *buf, int count, MPI_Datatype datatype,
int dest, int tag, MPI_Comm comm);
int MPI_Send_c (
const void *buf, MPI_Count count, MPI_Datatype datatype,
int dest, int tag, MPI_Comm comm);
address of send buffer
number of elements in send buffer
datatype of each send buffer element
rank of destination
message tag
communicator