/*D
   MPI_Neighbor_allgatherv_init - Create a persistent request for neighbor_allgatherv.

Synopsis:
.vb
int MPI_Neighbor_allgatherv_init(const void *sendbuf, int sendcount,
                                 MPI_Datatype sendtype, void *recvbuf,
                                 const int recvcounts[], const int displs[],
                                 MPI_Datatype recvtype, MPI_Comm comm,
                                 MPI_Info info, MPI_Request *request)
.ve
.vb
int MPI_Neighbor_allgatherv_init_c(const void *sendbuf, MPI_Count sendcount,
                                   MPI_Datatype sendtype, void *recvbuf,
                                   const MPI_Count recvcounts[],
                                   const MPI_Aint displs[],
                                   MPI_Datatype recvtype, MPI_Comm comm,
                                   MPI_Info info, MPI_Request *request)
.ve

Input Parameters:
+ sendbuf - starting address of 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 (non-negative integer)
. displs - integer array (of length indegree). Entry i specifies the displacement (relative to recvbuf) at which to place the incoming data from neighbor i (integer)
. recvtype - data type of receive buffer elements (handle)
. comm - communicator with topology structure (handle)
- info - info argument (handle)

Output Parameters:
+ recvbuf - starting address of receive buffer (choice)
- request - communication request (handle)

.N ThreadSafe

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_ARG
.N MPI_ERR_BUFFER
.N MPI_ERR_COMM
.N MPI_ERR_COUNT
.N MPI_ERR_INFO
.N MPI_ERR_TYPE
.N MPI_ERR_OTHER

D*/

