These routines correspond to the MPI routines MPI_Send,
MPI_Bsend, MPI_Rsend, MPI_Ssend, and MPI_Recv
respectively.
MPID_SendContig( comm, buf, len, src_lrank, tag, context_id, dest_grank,
msgrep, &error_code )
MPID_BsendContig( comm, buf, len, src_lrank, tag, context_id, dest_grank,
msgrep, &error_code )
MPID_RsendContig( comm, buf, len, src_lrank, tag, context_id, dest_grank,
msgrep, &error_code )
MPID_SsendContig( comm, buf, len, src_lrank, tag, context_id, dest_grank,
msgrep, &error_code )
MPID_RecvContig( comm, buf, maxlen, src_lrank, tag, context_id,
&status, &error_code )