/*D
   MPI_Alltoallv - Sends data from all to all processes; each process may send a different amount of data and provide displacements for the input and output data.

Synopsis:
.vb
int MPI_Alltoallv(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)
.ve
.vb
int MPI_Alltoallv_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)
.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)

Output Parameters:
. recvbuf - address of receive buffer (choice)

.N ThreadSafe

.N Fortran

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

D*/

