Function mpi::ffi::PMPI_Gatherv

pub unsafe extern fn PMPI_Gatherv(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,
                                  root: c_int,
                                  comm: MPI_Comm)
                                  -> c_int