Function PMPI_Alltoall

pub unsafe extern "C" 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