Function mpi::ffi::PMPI_Alltoall

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