fifo.c

来自「linux下的fusion程序,可以和directfb配合使用」· C语言 代码 · 共 54 行

/*
 *	Fusion Kernel Module
 *
 *	(c) Copyright 2002-2003  Convergence GmbH
 *
 *      Written by Denis Oliver Kropp <[e-mail]>
 *
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 */

#include <linux/types.h>

#include "fifo.h"

void
fusion_fifo_put (FusionFifo *fifo, FusionLink *link)
{
     link->prev = fifo->last;
     link->next = NULL;

     if (fifo->last)
          fifo->last->next = link;
     else
          fifo->first = link;

     fifo->last = link;

     fifo->count++;
}

FusionLink *
fusion_fifo_get (FusionFifo *fifo)
{
     FusionLink *first = fifo->first;

     if (!first)
          return NULL;

     fifo->first = first->next;

     if (fifo->last == first)
          fifo->last = NULL;
     else
          fifo->first->prev = NULL;

     fifo->count--;

     return first;
}