/*D
   MPI_Alltoallv_init - Create a persistent request for alltoallv.

Synopsis:
.vb
int MPI_Alltoallv_init(const void *sendbuf, const int sendcounts[],
                       const int sdispls[], MPI_Datatype sendtype,
                       void *recvbuf, const int recvcounts[],
                       const int rdispls[], MPI_Datatype recvtype,
                       MPI_Comm comm, MPI_Info info, MPI_Request *request)
.ve
.vb
int MPI_Alltoallv_init_c(const void *sendbuf, const MPI_Count sendcounts[],
                         const MPI_Aint sdispls[], MPI_Datatype sendtype,
                         void *recvbuf, const MPI_Count recvcounts[],
                         const MPI_Aint rdispls[], MPI_Datatype recvtype,
                         MPI_Comm comm, MPI_Info info, MPI_Request *request)
.ve

Input Parameters:
+ sendbuf - starting address of send buffer (choice)
. sendcounts - non-negative integer array (of length group size) specifying the number of elements to send to each rank (non-negative integer)
. sdispls - Integer array (of length group size). Entry j specifies the displacement (relative to sendbuf) from which to take the outgoing data destined for process j (integer)
. sendtype - data type of send buffer elements (handle)
. recvcounts - non-negative integer array (of length group size) specifying the number of elements that can be received from each rank (non-negative integer)
. rdispls - integer array (of length group size). Entry i specifies the displacement (relative to recvbuf) at which to place the incoming data from process i (integer)
. recvtype - data type of receive buffer elements (handle)
. comm - communicator (handle)
- info - info argument (handle)

Output Parameters:
+ recvbuf - 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*/

