Function mpi::ffi::MPI_Allgatherv

pub unsafe extern "C" fn MPI_Allgatherv(
    sendbuf: *const c_void,
    sendcount: i32,
    sendtype: *mut ompi_datatype_t,
    recvbuf: *mut c_void,
    recvcounts: *const i32,
    displs: *const i32,
    recvtype: *mut ompi_datatype_t,
    comm: *mut ompi_communicator_t
) -> i32