/*D
   MPI_Ireduce_scatter_block - Combines values and scatters the results in a nonblocking way

Synopsis:
.vb
int MPI_Ireduce_scatter_block(const void *sendbuf, void *recvbuf, int recvcount,
                              MPI_Datatype datatype, MPI_Op op, MPI_Comm comm,
                              MPI_Request *request)
.ve
.vb
int MPI_Ireduce_scatter_block_c(const void *sendbuf, void *recvbuf,
                                MPI_Count recvcount, MPI_Datatype datatype,
                                MPI_Op op, MPI_Comm comm, MPI_Request *request)
.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)
- 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_OP
.N MPI_ERR_TYPE
.N MPI_ERR_OTHER

D*/

