/*D
   MPI_Allgatherv_init - Create a persistent request for allgatherv.

Synopsis:
.vb
int MPI_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_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 in send buffer (non-negative integer)
. sendtype - data type of send buffer elements (handle)
. recvcounts - non-negative integer array (of length group size) containing the number of elements that are received from each process (non-negative integer)
. displs - 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*/

