/*D
   MPI_Ireduce - Reduces values on all processes to a single value in a nonblocking way

Synopsis:
.vb
int MPI_Ireduce(const void *sendbuf, void *recvbuf, int count,
                MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm,
                MPI_Request *request)
.ve
.vb
int MPI_Ireduce_c(const void *sendbuf, void *recvbuf, MPI_Count count,
                  MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm,
                  MPI_Request *request)
.ve

Input Parameters:
+ sendbuf - address of send buffer (choice)
. count - number of elements in send buffer (non-negative integer)
. datatype - data type of elements of send buffer (handle)
. op - reduce operation (handle)
. root - rank of root process (integer)
- comm - communicator (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_OP
.N MPI_ERR_TYPE
.N MPI_ERR_OTHER

D*/

