dlm_wait_function
error = dlm_wait_function(ls, &rcom_response);
error = dlm_wait_function(ls, &rcom_response);
error = dlm_wait_function(ls, &recover_xa_empty);
error = dlm_wait_function(ls, &recover_list_empty);
int dlm_wait_function(struct dlm_ls *ls, int (*testfn) (struct dlm_ls *ls));