/*D
   MPI_Alltoallw - Generalized all-to-all communication allowing different datatypes, counts, and displacements for each partner

Synopsis:
.vb
int MPI_Alltoallw(const void *sendbuf, const int sendcounts[],
                  const int sdispls[], const MPI_Datatype sendtypes[],
                  void *recvbuf, const int recvcounts[], const int rdispls[],
                  const MPI_Datatype recvtypes[], MPI_Comm comm)
.ve
.vb
int MPI_Alltoallw_c(const void *sendbuf, const MPI_Count sendcounts[],
                    const MPI_Aint sdispls[], const MPI_Datatype sendtypes[],
                    void *recvbuf, const MPI_Count recvcounts[],
                    const MPI_Aint rdispls[], const MPI_Datatype recvtypes[],
                    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 in bytes (relative to sendbuf) from which to take the outgoing data destined for process j (integer)
. sendtypes - array of datatypes (of length group size). Entry j specifies the type of data to send to process j (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 in bytes (relative to recvbuf) at which to place the incoming data from process i (integer)
. recvtypes - array of datatypes (of length group size). Entry i specifies the type of data received from process i (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*/

