xbt_fifo_shift(mc_stack);
if (dot_output != NULL)
fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", initial_global_state->prev_pair, pair_test->num, initial_global_state->prev_req);
xbt_fifo_shift(mc_stack);
if (dot_output != NULL)
fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", initial_global_state->prev_pair, pair_test->num, initial_global_state->prev_req);