#ifndef __SOUND_UTIL_MEM_H
  #define __SOUND_UTIL_MEM_H
  
  #include <linux/mutex.h>
  /*
   *  Copyright (C) 2000 Takashi Iwai <tiwai@suse.de>
   *
   *  Generic memory management routines for soundcard memory allocation
   *
   *   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.
   *
   *   This program is distributed in the hope that it will be useful,
   *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *   GNU General Public License for more details.
   *
   *   You should have received a copy of the GNU General Public License
   *   along with this program; if not, write to the Free Software
   *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
   */
  
  /*
   * memory block
   */
  struct snd_util_memblk {
  	unsigned int size;		/* size of this block */
  	unsigned int offset;		/* zero-offset of this block */
  	struct list_head list;		/* link */
  };
  
  #define snd_util_memblk_argptr(blk)	(void*)((char*)(blk) + sizeof(struct snd_util_memblk))
  
  /*
   * memory management information
   */
  struct snd_util_memhdr {
  	unsigned int size;		/* size of whole data */
  	struct list_head block;		/* block linked-list header */
  	int nblocks;			/* # of allocated blocks */
  	unsigned int used;		/* used memory size */
  	int block_extra_size;		/* extra data size of chunk */
  	struct mutex block_mutex;	/* lock */
  };
  
  /*
   * prototypes
   */
  struct snd_util_memhdr *snd_util_memhdr_new(int memsize);
  void snd_util_memhdr_free(struct snd_util_memhdr *hdr);
  struct snd_util_memblk *snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size);
  int snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk);
  int snd_util_mem_avail(struct snd_util_memhdr *hdr);
  
  /* functions without mutex */
  struct snd_util_memblk *__snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size);
  void __snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk);
  struct snd_util_memblk *__snd_util_memblk_new(struct snd_util_memhdr *hdr,
  					      unsigned int units,
  					      struct list_head *prev);
  
  #endif /* __SOUND_UTIL_MEM_H */