/*D
   MPI_Reduce_scatter_block - Combines values and scatters the results

Synopsis:
.vb
int MPI_Reduce_scatter_block(const void *sendbuf, void *recvbuf, int recvcount,
                             MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)
.ve
.vb
int MPI_Reduce_scatter_block_c(const void *sendbuf, void *recvbuf,
                               MPI_Count recvcount, MPI_Datatype datatype,
                               MPI_Op op, MPI_Comm comm)
.ve

Input Parameters:
+ sendbuf - starting address of send buffer (choice)
. recvcount - element count per block (non-negative integer)
. datatype - data type of elements of send and receive buffers (handle)
. op - operation (handle)
- comm - communicator (handle)

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

.N collops

.N ThreadSafe

.N Fortran

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

D*/

