Function mpi::ffi::PMPI_Accumulate

pub unsafe extern fn PMPI_Accumulate(origin_addr: *const c_void,
                                     origin_count: c_int,
                                     origin_datatype: MPI_Datatype,
                                     target_rank: c_int,
                                     target_disp: MPI_Aint,
                                     target_count: c_int,
                                     target_datatype: MPI_Datatype,
                                     op: MPI_Op,
                                     win: MPI_Win)
                                     -> c_int