Function mpi::ffi::PMPI_Ineighbor_allgatherv

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