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 typedef struct snd_util_memblk snd_util_memblk_t;
  24 typedef struct snd_util_memhdr snd_util_memhdr_t;
  25 typedef unsigned int snd_util_unit_t;
  26
  27 /*
  28  * memory block
  29  */
  30 struct snd_util_memblk {
  31         snd_util_unit_t size;           /* size of this block */
  32         snd_util_unit_t offset;         /* zero-offset of this block */
  33         struct list_head list;          /* link */
  34 };
  35
  36 #define snd_util_memblk_argptr(blk)     (void*)((char*)(blk) + sizeof(snd_util_memblk_t))
  37
  38 /*
  39  * memory management information
  40  */
  41 struct snd_util_memhdr {
  42         snd_util_unit_t size;           /* size of whole data */
  43         struct list_head block;         /* block linked-list header */
  44         int nblocks;                    /* # of allocated blocks */
  45         snd_util_unit_t used;           /* used memory size */
  46         int block_extra_size;           /* extra data size of chunk */
  47         struct semaphore block_mutex;   /* lock */
  48 };
  49
  50 /*
  51  * prototypes
  52  */
  53 snd_util_memhdr_t *snd_util_memhdr_new(int memsize);
  54 void snd_util_memhdr_free(snd_util_memhdr_t *hdr);
  55 snd_util_memblk_t *snd_util_mem_alloc(snd_util_memhdr_t *hdr, int size);
  56 int snd_util_mem_free(snd_util_memhdr_t *hdr, snd_util_memblk_t *blk);
  57 int snd_util_mem_avail(snd_util_memhdr_t *hdr);
  58
  59 /* functions without mutex */
  60 snd_util_memblk_t *__snd_util_mem_alloc(snd_util_memhdr_t *hdr, int size);
  61 void __snd_util_mem_free(snd_util_memhdr_t *hdr, snd_util_memblk_t *blk);
  62 snd_util_memblk_t *__snd_util_memblk_new(snd_util_memhdr_t *hdr, snd_util_unit_t units, struct list_head *prev);
  63
  64 #endif /* __SOUND_UTIL_MEM_H */