SYNOPSIS

int MPI_Neighbor_allgatherv(const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, const int recvcounts[], const int displs[], MPI_Datatype recvtype, MPI_Comm comm)

INPUT PARAMETERS

sendbuf

- starting address of the send buffer (choice)

sendcount

- number of elements sent to each neighbor (non-negative integer)

sendtype

- data type of send buffer elements (handle)

recvcounts

- non-negative integer array (of length indegree) containing the number of elements that are received from each neighbor

displs

- integer array (of length indegree). Entry i specifies the displacement (relative to recvbuf) at which to place the incoming data from neighbor i.

recvtype

- data type of receive buffer elements (handle)

comm

- communicator (handle)

OUTPUT PARAMETERS

recvbuf

- starting address of the receive buffer (choice)

THREAD AND INTERRUPT SAFETY

This routine is thread-safe. This means that this routine may be safely used by multiple threads without the need for any user-provided thread locks. However, the routine is not interrupt safe. Typically, this is due to the use of memory allocation routines such as malloc or other non-MPICH runtime routines that are themselves not interrupt-safe.

NOTES FOR FORTRAN

All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have an additional argument ierr at the end of the argument list. ierr is an integer and has the same meaning as the return value of the routine in C. In Fortran, MPI routines are subroutines, and are invoked with the call statement.

All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran.