Function mpi::ffi::PMPI_Ineighbor_allgather

pub unsafe extern fn PMPI_Ineighbor_allgather(sendbuf: *const c_void,
                                              sendcount: c_int,
                                              sendtype: MPI_Datatype,
                                              recvbuf: *mut c_void,
                                              recvcount: c_int,
                                              recvtype: MPI_Datatype,
                                              comm: MPI_Comm,
                                              request: *mut MPI_Request)
                                              -> c_int