include/sound/util_mem.h

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