C++ (Cpp) ttyq_prev示例

示例#1

文件： tty.c 项目： cya410/libraries

/*
 * Remove the last character in a queue and return it.
 */
static int tty_unputc(struct tty_queue *tq)
{
  if (ttyq_empty(tq))
    return -1;

  int s = splhigh();
  tq->tq_tail = ttyq_prev(tq->tq_tail);
  int c = tq->tq_buf[tq->tq_tail];
  tq->tq_count--;
  splx(s);
  return c & 0xFF;
}

示例#2

文件： tty.c 项目： AndrewD/prex

/*
 * Remove the last character in a queue and return it.
 */
int
ttyq_unputc(struct tty_queue *tq)
{
	int c;

	if (ttyq_empty(tq))
		return -1;
	irq_lock();
	tq->tq_tail = ttyq_prev(tq->tq_tail);
	c = tq->tq_buf[tq->tq_tail];
	tq->tq_count--;
	irq_unlock();
	return c;
}