LXR linux/include/sound/util

   1#ifndef __SOUND_UTIL_MEM_H
   2#define __SOUND_UTIL_MEM_H
   3
   4#include <linux/mutex.h>
   5/*
   6 *  Copyright (C) 2000 Takashi Iwai <tiwai@suse.de>
   7 *
   8 *  Generic memory management routines for soundcard memory allocation
   9 *
  10 *   This program is free software; you can redistribute it and/or modify
  11 *   it under the terms of the GNU General Public License as published by
  12 *   the Free Software Foundation; either version 2 of the License, or
  13 *   (at your option) any later version.
  14 *
  15 *   This program is distributed in the hope that it will be useful,
  16 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 *   GNU General Public License for more details.
  19 *
  20 *   You should have received a copy of the GNU General Public License
  21 *   along with this program; if not, write to the Free Software
  22 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  23 */
  24
  25/*
  26 * memory block
  27 */
  28struct snd_util_memblk {
  29        unsigned int size;              /* size of this block */
  30        unsigned int offset;            /* zero-offset of this block */
  31        struct list_head list;          /* link */
  32};
  33
  34#define snd_util_memblk_argptr(blk)     (void*)((char*)(blk) + sizeof(struct snd_util_memblk))
  35
  36/*
  37 * memory management information
  38 */
  39struct snd_util_memhdr {
  40        unsigned int size;              /* size of whole data */
  41        struct list_head block;         /* block linked-list header */
  42        int nblocks;                    /* # of allocated blocks */
  43        unsigned int used;              /* used memory size */
  44        int block_extra_size;           /* extra data size of chunk */
  45        struct mutex block_mutex;       /* lock */
  46};
  47
  48/*
  49 * prototypes
  50 */
  51struct snd_util_memhdr *snd_util_memhdr_new(int memsize);
  52void snd_util_memhdr_free(struct snd_util_memhdr *hdr);
  53struct snd_util_memblk *snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size);
  54int snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk);
  55int snd_util_mem_avail(struct snd_util_memhdr *hdr);
  56
  57/* functions without mutex */
  58struct snd_util_memblk *__snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size);
  59void __snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk);
  60struct snd_util_memblk *__snd_util_memblk_new(struct snd_util_memhdr *hdr,
  61                                              unsigned int units,
  62                                              struct list_head *prev);
  63
  64#endif /* __SOUND_UTIL_MEM_H */
  65